Attachment for automotive trailers

Claim 2

A power-actuated locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a power-actuated locking and unlocking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said power-actuated locking and unlocking member, said power-actuated locking and unlocking member being selectively responsive to the application of power to move into locking engagement with various of said longitudinally-spaced surfaces on said other of said objects to lock said objects together in various longitudinally-spaced positions, said power-actuated locking and unlocking member being selectively responsive to the application of power to move to a position wherein it is out of locking engagement with all of said longitudinally-spaced surfaces on said other of said objects to free said objects for relative forward or rearward movement, and said power-actuated locking and unlocking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said power-actuated locking and unlocking member responds to the application of power to move into locking engagement with said one of said longitudinally-spaced surfaces, said power-actuated locking and unlocking member being separate from, and being independent of, all braking systems for said automotive trailer.

Claim 3

A power-actuated locking and unlocking system as claimed in claim 1 wherein said power-actuated locking and unlocking member includes a pneumatic cylinder, wherein said longitudinally-spaced surfaces are the bounding portions of openings, wherein said pneumatic cylinder selectively responds to the application of compressed air to move a locking surface into various of said openings, and wherein said pneumatic cylinder selectively responds to the application of compressed air to move said locking surface out of said various openings.

Claim 4

A power-actuated locking and unlocking system as claimed in claim 1 wherein said power-actuated locking and unlocking member includes a pneumatic cylinder that is directed transversely of said one of said objects, wherein said longitudinally-spaced surfaces are the bounding portions of openings within a longitudinally-extending structural member of said other of said objects, wherein said pneumatic cylinder selectively responds to the application of compressed air to move a locking surface into various of said openings, and wherein said pneumatic cylinder selectively responds to the application of compressed air to move said locking surface out of said various openings.

Claim 5

A power-actuated locking and unlocking system as claimed in claim 1 wherein said power-actuated locking and unlocking member includes a pneumatic cylinder, wherein a valve for said pneumatic cylinder selectively permits compressed air to enter and exhaust from said pneumatic cylinder, wherein said longitudinally-spaced surfaces are the bounding portions of openings, wherein said pneumatic cylinder selectively responds to the application of compressed air to move a locking surface into various of said openings, wherein said pneumatic cylinder selectively responds to the application of compressed air to move said locking surface out of said various openings, and wherein said valve will hold compressed air within said pneumatic cylinder and thereby cause said pneumatic cylinder to hold said locking surface in any adjacent opening in the event the supply of compressed air, which is supplied to said valve for application to said pneumatic cylinder, is discontinued.

Claim 6

A power-actuated locking and unlocking system as claimed in claim 1 wherein said power-actuated locking and unlocking member is located between, and hence is shielded and protected by, said objects.

Claim 7

A power-actuated locking and unlocking system as claimed in claim 1 wherein said power-actuated locking and unlocking member includes a pneumatic cylinder, wherein said pneumatic cylinder selectively responds to the application of compressed air to move a locking surface into various of said openings, wherein said pneumatic cylinder selectively responds to the application of compressed air to move said locking surface out of said various openings, wherein said locking surface is a locking pin secured to the piston of said pneumatic cylinder, and wherein said locking pin is confined and guided for reciprocal movement relative to various of said openings by a guide member.

Claim 8

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, an indicator which can respond to said sensor to indicate when said locking member is in register with said predetermined one of said longitudinally-spaced surfaces, and selectively-operated means which can actuate said locking member to cause said locking member to move into locking engagement with said predetermined one of said longitudinally-spaced surfaces.

Claim 9

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, an indicator which can respond to said sensor to indicate when said locking member is in register with said predetermined one of said longitudinally-spaced surfaces, and selectively-operated means which can actuate said locking member to cause said locking member to move into locking engagement with said predetermined one of said longitudinally-spaced surfaces.

Claim 10

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, said sensor being mounted adjacent said objects, and an indicator which responds to said sensor but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 11

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, said sensor being mounted adjacent said objects, and an indicator which responds to said sensor but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 12

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, further sensors which can indicate when said locking member is in register with further predetermined ones of said longitudinally-spaced surfaces, the first said and said further sensors being mounted adjacent said objects, and an indicator which responds to said sensors but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 13

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, further sensors which can indicate when said locking member is in register with further predetermined ones of said longitudinally-spaced surfaces, the first said and said further sensors being mounted adjacent said objects, and an indicator which responds to said sensors but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 14

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, further sensors which can indicate when said locking member is in register with further predetermined ones of said longitudinally-spaced surfaces, said sensors being circuit-closing devices, and said sensors being mounted adjacent said objects, and an indicator which responds to said sensors but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 15

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, further sensors which can indicate when said locking member is in register with further predetermined ones of said longitudinally-spaced surfaces, said sensors being circuit-closing devices, and said sensors being mounted adjacent said objects, and an indicator which responds to said sensors but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 16

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, said locking member including a pneumatic cylinder, said longitudinally-spaced surfaces being the bounding portions of openings, said pneumatic cylinder selectively moving a locking surface into or out of various of said openings, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said openings, a further sensor which can indicate when said locking surface is within any one of said openings, and an indicator which responds to said sensors but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 17

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, said locking member including a pneumatic cylinder, said longitudinally-spaced surfaces being the bounding portions of openings, said pneumatic cylinder selectively moving a locking surface into or out of various of said openings, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said openings, a further sensor which can indicate when said locking surface is within any one of said openings, and an indicator which responds to said sensors but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 18

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, said locking member including a pneumatic cylinder, said longidutinally-spaced surfaces being the bounding portions of openings, said pneumatic cylinder selectively moving a locking surface into or out of various of said openings, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said openings, a further sensor which can indicate when said locking surface is within any one of said openings, an indicator which responds to said sensors but is remote from said objects, the first said sensor being electrical, said further sensor being electrical, and said indicator being electrical, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 19

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, said locking member including a pneumatic cylinder, said longidutinally-spaced surfaces being the bounding portions of openings, said pneumatic cylinder selectively moving a locking surface into or out of various of said openings, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said openings, a further sensor which can indicate when said locking surface is within any one of said openings, an indicator which responds to said sensors but is remote from said objects, the first said sensor being electrical, said further sensor being electrical, and said indicator being electrical, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 20

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, said locking member including a pneumatic cylinder, said longitudinally-spaced surfaces being the bounding portions of openings, said pneumatic cylinder selectively moving a locking surface into or out of various of said openings, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, said sensor being displaced from said predetermined one of said longitudinally-spaced surfaces, and an indicator which responds to said sensor but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 21

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, said locking member including a pneumatic cylinder, said longitudinally-spaced surfaces being the bounding portions of openings, said pneumatic cylinder selectively moving a locking surface into or out of various of said openings, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, said sensor being displaced from said predetermined one of said longitudinally-spaced surfaces, and an indicator which responds to said sensor but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 22

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, said locking member including a pneumatic cylinder, said longitudinally-spaced surfaces being the bounding portions of openings, said pneumatic cylinder selectively moving a locking surface into or out of various of said openings, a plurality of sensors which sense the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with said longitudinally-spaced surfaces, said sensors being displaced from said longitudinally-spaced surfaces but having spacings and orientations which are similar to the spacings and orientations of said longitudinally-spaced surfaces, and an indicator which responds to said sensors but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 23

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, said locking member including a pneumatic cylinder, said longitudinally-spaced surfaces being the bounding portions of openings, said pneumatic cylinder selectively moving a locking surface into or out of various of said openings, a plurality of sensors which sense the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with said longitudinally-spaced surfaces, said sensors being displaced from said longitudinally-spaced surfaces but having spacings and orientations which are similar to the spacings and orientations of said longitudinally-spaced surfaces, and an indicator which responds to said sensors but which is remote from said objects, said indicator being located so it is within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 24

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, a further sensor which can indicate when said locking member is in engagement with said predetermined one longitudinally-spaced surface, and said sensors being adjacent said objects.

Claim 25

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, a further sensor which can indicate when said locking member is in engagement with said predetermined one longitudinally-spaced surface, and said sensors being adjacent said objects.

Claim 26

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, a further sensor which can indicate when said locking member is in engagement with said predetermined one longitudinally-spaced surface, said sensors being adjacent said objects, indicating means which can respond to the first said sensor to provide an indication when said locking member is in register with said predetermined one longitudinally-spaced surface and also can respond to said further sensor to provide an indication when said locking member is in engagement with said predetermined one longitudinally-spaced surface, and said indicating means being remote from said objects and being within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.

Claim 27

A locking and unlocking system for two relatively-movable objects which can be selectively locked together for conjoint movement or which can be unlocked for movement relative to each other, said objects being an automotive trailer and a wheel-supporting slider for said automotive trailer which is adjacent the rear of said automotive trailer, said system comprising interacting relatively-movable surfaces on said objects which can permit relative forward or rearward movement of said objects, a locking member that is mounted on and movable with one of said objects, a plurality of longitudinally-spaced surfaces on the other of said objects that can be selectively engaged by said locking member to lock said objects together in various longitudinally-spaced positions, and said locking member and any one of said longitudinally-spaced surfaces being adapted to prevent relative forward or rearward movement of said objects and hence to insure conjoint movement of said objects whenever said locking member is in locking engagement with said one of said longitudinally-spaced surfaces, a sensor which senses the position of said locking member longitudinally of said longitudinally-spaced surfaces and which can indicate when said locking member is in register with a predetermined one of said longitudinally-spaced surfaces, a further sensor which can indicate when said locking member is in engagement with said predetermined one longitudinally-spaced surface, said sensors being adjacent said objects, indicating means which can respond to the first said sensor to provide an indication when said locking member is in register with said predetermined one longitudinally-spaced surface and also can respond to said further sensor to provide an indication when said locking member is in engagement with said predetermined one longitudinally-spaced surface, and said indicating means being remote from said objects and being within the sensing range of the driver of the automotive tractor which pulls said automotive trailer.