Door locking device

Claim 2

A door locking device for locking a door in a doorway frame of a motor vehicle comprising, a striker fixed to said doorway frame, a base plate fixed to the door, a cover plate fixed to the base plate, a main body of synthetic resin fixedly provided between the base plate and the cover plate, said main body having a recessed portion of a concave cylindrical bearing surface, a latch member rotatably supported on said main body for movement about an axis extending longitudinally of the vehicle, said latch member being adapted to engage with and be rotated into a striker locking position by said striker when the door is closed, a detent rotatably mounted in the recessed portion of said main body for movement about an axis parallel to the axis of the latch member, said detent being rotatably operated by portions of the periphery of said latch member to catch and lock the latch member in said locking position and being operable to release the latch member, an outer periphery of said detent beiNg backed up by said concave cylindrical bearing surface of the main body against forces transverse to the rotational axis of the detent, and a door unlocking mechanism for operating the detent to release the latch member and when a force adapted to disengage the engagement of the striker with the latch member is imparted in the locking position, the force is received by the concave cylindrical bearing surface through the peripheral surface of the detent.

Claim 3

The door locking device as claimed in claim 1 in which said striker locked by said latch member in said locking position is in a position substantially intermediate between the rotational axes of the latch member and said detent.

Claim 4

A door locking device for locking a door in a doorway frame of a motor vehicle comprising, a striker fixed to said doorway frame, a latch member rotatably supported on said door for movement about an axis extending longitudinally of the vehicle, said latch member being adapted to engage with and be rotated into a striker locking position by said striker when the door is closed, a detent rotatably mounted on the door for movement about an axis parallel to the axis of the latch member, said detent having a configuration which in at least one part thereof constitutes a part of a circular cylinder, said circular cylinder part of the detent being rotatably operated by portions of the periphery of said latch member to catch and lock the latch member in said locking position and being operable to release the latch member, a part supported on the door, said door supported part having a concave cylindrical bearing surface for rotatably backing up said detent against forces transverse to the rotational axis thereof, and a door unlocking mechanism for operating the detent to release the latch member and when a force adapted to disengage the engagement of the striker with the latch member is imparted in the locking position, the force is received by the concave cylindrical bearing surface through the peripheral surface of the detent, said detent having a fully circular cylindrical part and said concave cylindrical bearing surface being a fully cylindrical concavity snugly accommodating said fully circular cylindrical part of the detent, and a part circular cylindrical concavity snugly contacting said circular cylindrical part of the detent over a substantial surface thereof without contacting the latch member at any position thereof.

Claim 5

A door locking device for locking a door in a doorway frame of a motor vehicle comprising, a striker fixed to said doorway frame, a latch member rotatably supported on said door for movement about an axis extending longitudinally of the vehicle, said latch member being adapted to engage with and be rotated into a striker locking position by said striker when the door is closed, a detent rotatably mounted on the door for movement about an axis parallel to the axis of the latch member, said detent having a configuration which in at least one part thereof constitutes a part of a circular cylinder, said circular cylinder part of the detent being rotatably operated by portions of the periphery of said latch member to catch and lock the latch member in said locking position and being operable to release the latch member, a part supported on the door, said door supported part having a concave cylindrical bearing surface for rotatably backing up said detent against forces transverse to the rotational axis thereof, and a door unlocking mechanism for operating the detent to release the latch member and when a force adapted to disengage the engagement of the striker with the latch member is imparted in the locking position, the force is received by the concave cylindrical bearing surface through the peripheral surface of the detent, said detent having a fully circular cylindrical part and said concave cylindrical bearing surface being a fully cylindrical concavity snugly accommodating said fully circular cylindrical part of the detent, and a part circular cylindrical concavity snugly contacting said circular cylindrical part of the detent over a substantial surface thereof without contacting the latch member at any position thereof.

Claim 6

The door locking device as claimed in claim 3 in which said latch member is of planar form, the axis of which is the axis of rotation thereof, and being substantially perpendicular to the direction of motion of the latch member relative to the striker, and being substantially parallel to the axis of said detent, and the latch member having a slot extending substantially radially outward to an open end at the periphery of the latch member with said slot being adapted to engage and receive therein the striker.

Claim 7

A latch mechanism for a door of a motor vehicle body, including a striker fixed to the vehicle body and a rotary latch member, a recessed body of synthetic resin in which said rotary latch member is mounted, said body having a slot for receiving the striker, said rotary latch member including an integral pivotal mounting portion rotatable in a bore in the body, and a detent rotatably mounted in the recessed body to engage the latch member in the same plane as the slot for receiving the striker.

Claim 8

A latch mechanism for a door of a motor vehicle body, including a striker fixed to the vehicle body and a rotary latch member, a recessed body of synthetic resin in which said rotary latch member is mounted, said body having a slot for receiving the striker, said rotary latch member including an integral pivotal mounting portion rotatable in a bore in the body, and a detent rotatably mounted in the recessed body to engage the latch member in the same plane as the slot for receiving the striker.

Claim 9

The latch mechanism as claimed in claim 5, in which the pivot point of the latch member is located at the opposite side of the engagement point between the detent and the latch member relative to the striker.