US4650256A — Apparatus for retaining a tool in machinery

Claim 1

Independent Claim 291 words

Apparatus for retaining a tool in machinery, said apparatus comprising a base plate and a tool holder having a cylindrical receptacle into which a cylindrical tool shaft may be inserted rotatably and removably wherein said tool holder is detachably connectable to said base plate which is ridigly connectable to the machine, said tool holder and said base plate in combination providing a self-locking dovetail connection in which a dovetail tenon and a dovetail groove taper correspondingly in an insertion direction to provide a detachable, self-locking connection between said tool holder and said base plate, whereby when said tool is stressed, at least one force component acts in said insertion direction and enhances said self-locking connection, characterized by said dovetail groove (32) being provided in the top of said base plate (31) and said dovetail tenon (14) being located on the bottom of said tool holder (10) between two extending aprons (15, 16) spaced in opposite directions from said tenon (14) forming slots (17, 18) between said dovetail tenon (14) and each said apron (15, 16), said aprons partially covering opposing side walls of said base plate (31) oriented parallel to said dovetail groove (32) when said tool holder 910) is connected to said base plate (31), and wherein one of said base plate (31) and said tool holder (10) is provided in the area of said dovetail connection with arrest serrations (40) running transverse to said insertion direction and the other of said tool holder (10) and said base plate (31) is provided with a spring-loaded holding bolt (26) oriented to engage with said arrest serrations (40), thereby providing an additional connection between said base plate (31) and said tool holder (10) oriented in a plane perpendicular to said insertion direction.

Claim 2

Dependent Claim 291 words

Apparatus for retaining a tool in machinery, said apparatus comprising a base plate and a tool holder having a cylindrical receptacle into which a cylindrical tool shaft may be inserted rotatably and removably wherein said tool holder is detachably connectable to said base plate which is ridigly connectable to the machine, said tool holder and said base plate in combination providing a self-locking dovetail connection in which a dovetail tenon and a dovetail groove taper correspondingly in an insertion direction to provide a detachable, self-locking connection between said tool holder and said base plate, whereby when said tool is stressed, at least one force component acts in said insertion direction and enhances said self-locking connection, characterized by said dovetail groove (32) being provided in the top of said base plate (31) and said dovetail tenon (14) being located on the bottom of said tool holder (10) between two extending aprons (15, 16) spaced in opposite directions from said tenon (14) forming slots (17, 18) between said dovetail tenon (14) and each said apron (15, 16), said aprons partially covering opposing side walls of said base plate (31) oriented parallel to said dovetail groove (32) when said tool holder 910) is connected to said base plate (31), and wherein one of said base plate (31) and said tool holder (10) is provided in the area of said dovetail connection with arrest serrations (40) running transverse to said insertion direction and the other of said tool holder (10) and said base plate (31) is provided with a spring-loaded holding bolt (26) oriented to engage with said arrest serrations (40), thereby providing an additional connection between said base plate (31) and said tool holder (10) oriented in a plane perpendicular to said insertion direction.

Claim 3

Dependent Claim 89 words

Apparatus as described in claim 1, characterized by tool holder surfaces (21, 24) forming the top of said slots (17, 18) being adjacent to sides (20, 23) of said dovetail tenon (14) and being at an acute angle to said sides (20, 23) corresponding to an acute angle at which base plate terminal contact surfaces (33, 35) oriented parallel to said tool holder surfaces (21, 24) when said tool holder (10) is connected to said base plate (31) are oriented to sides (34, 36) of said dovetail groove (32).

Claim 4

Dependent Claim 35 words

Apparatus as described in claim 2, characterized by said dovetail connection being oriented symmetrically to a central plane (45) extending through a central axis (46) of said receptacle (11) and perpendicular to a connection plane.

Claim 5

Dependent Claim 86 words

Apparatus as described in claim 2, characterized by said dovetail tenon (14) having a blind hole (25) perpendicular to a connection plane in which a holding bolt (26) is retained spring-loaded, non-rotatable and undetachable, said holding bolt (26) having a serrated end portion (27), and said dovetail groove (32) being provided in groove bottom (37) with an arrest element (39) having an upper face serrated portion (40) matable with said serrations of said holding bolt (26), all said serrations being transverse to said insertion direction (44).

Claim 6

Dependent Claim 92 words

Apparatus as described in claim 3, characterized by said dovetail tenon (14) having a blind hole (25) perpendicular to said connection plane in which a holding bolt (26) is retained spring-loaded, non-rotatable and undetachable, said holding bolt (26) having a serrated end portion (27), and said dovetail groove (32) being provided in groove bottom (37) being provided in groove bottom (37) with an arrest element (39) having an upper face serrated portion (40) matable with said serrations of said holding bolt (26), all said serrations being transverse to said insertion direction (44).

Claim 7

Dependent Claim 59 words

Apparatus as described in claim 5, characterized by said serrated portions (27) of said holding bolt (26) having front tooth flanks (28) facing the insertion direction (44) flatter than adjacent rear tooth flanks (29) and said arrest element (39) having serrations (40) with front tooth flanks (41) facing the insertion direction (43) flatter than adjacent rear tooth flanks (42).

Claim 8

Dependent Claim 60 words

Apparatus as described in claim 5, characterized by said holding bolt (26) having lateral flattened portions (30) adjacent said serrated end portion (27) and said blind hole (25) of said tool holder (10) having flattened portions matching said flattened portions (30) of said holding bolt (26) to retain said holding bolt (26) non-rotatably and undetachably in said blind hole (25).

Claim 9

Dependent Claim 30 words

Apparatus as described in claim 5, characterized by the distance between said two aprons (15, 16) corresponding to a distance between two opposing side walls of said base plate (31).

Claim 10

Dependent Claim 60 words

Apparatus as described in claim 6, characterized by said holding bolt (26) having lateral flattened portions (30) adjacent said serrated end portion (27) and said blind hole (25) of said tool holder (10) having flattened portions matching said flattened portions (30) of said holding bolt (26) to retain said holding bolt (26) non-rotatably and undetachably in said blind hole (25).

Claim 11

Dependent Claim 22 words

Apparatus as described in claim 9, characterized by the bottom of said base plate (31) being circularly concave in the insertion direction.

Claim 12

Dependent Claim 30 words

Apparatus as described in claim 1, characterized by the distance between said two aprons (15, 16) corresponding to a distance between two opposing side walls of said base plate (31).

Claim 13

Dependent Claim 89 words

Apparatus as described in claim 11, characterized by tool holder surfaces (21, 24) forming the top of said slots (17, 18) being adjacent to sides (20, 23) of said dovetail tenon (14) and being at an acute angle to said sides (20, 23) corresponding to an acute angle at which base plate terminal contact surfaces (33, 35) oriented parallel to said tool holder surfaces (21, 24) when said tool holder (10) is connected to said base plate (31) are oriented to sides (34, 36) of said dovetail groove (32).

Claim 14

Dependent Claim 35 words

Apparatus as described in claim 1, characterized by said dovetail connection being oriented symmetrically to a central plane (45) extending through a central axis (46) of said receptacle (11) and perpendicular to a connection plane.

Claim 15

Dependent Claim 86 words

Apparatus as described in claim 1, characterized by said dovetail tenon (14) having a blind hole (25) perpendicular to a connection plane in which a holding bolt (26) is retained spring-loaded, non-rotatable and undetachable, said holding bolt (26) having a serrated end portion (27), and said dovetail groove (32) begin provided in groove bottom (37) with an arrest element (39) having an upper face serrated portion (40) matable with said serrations of said holding bolt (26), all said serrations being transverse to said insertion direction (44).

Claim 16

Dependent Claim 22 words

Apparatus as described in claim 1, characterized by the bottom of said base plate (31) being circularly concave in the insertion direction.

Claim 17

Dependent Claim 281 words

Apparatus for retaining a tool in machinery, said apparatus comprising a base plate and a tool holder having a cylindrical receptacle into which a cylindrical tool shaft may be inserted rotatably and removably wherein said tool holder is detachably connectable to said base plate which is rigidly connectable to the machine, said tool holder and said base plate in combination providing a self-locking dovetail connection in which a dovetail tenon and a dovetail groove taper correspondingly in an insertion direction to provide a detachable, self-locking connection between said tool holder and said base plate, whereby when said tool is stressed, at least one force component acts in said insertion direction and enhances said self-locking connection, characterized by said dovetail groove (32) being provided in the top of said base plate (31) and said dovetail tenon (14) being located on the bottom of said tool holder (10) between two extending aprons (15, 16) spaced in opposite directions from said tenon (14) forming slots (17, 18) between said dovetail tenon (14) and each said apron (15, 16), said aprons partially covering opposing side walls of said base plate (31) oriented parallel to said dovetail groove (32) when said tool holder (10) is connected to said base plate (31), and wherein one of said base plate (31) and said tool holder (10) is provided in the area of said dovetail connection with arrest serrations (50) running transverse to said insertion direction and the other of said tool holder (10) and said base plate (31) is provided with a stop spring (52) oriented to engage with said arrest serrations (50), thereby providing an additional connection between said base plate (31) and said tool holder (10).

Claim 18

Dependent Claim 281 words

Apparatus for retaining a tool in machinery, said apparatus comprising a base plate and a tool holder having a cylindrical receptacle into which a cylindrical tool shaft may be inserted rotatably and removably wherein said tool holder is detachably connectable to said base plate which is rigidly connectable to the machine, said tool holder and said base plate in combination providing a self-locking dovetail connection in which a dovetail tenon and a dovetail groove taper correspondingly in an insertion direction to provide a detachable, self-locking connection between said tool holder and said base plate, whereby when said tool is stressed, at least one force component acts in said insertion direction and enhances said self-locking connection, characterized by said dovetail groove (32) being provided in the top of said base plate (31) and said dovetail tenon (14) being located on the bottom of said tool holder (10) between two extending aprons (15, 16) spaced in opposite directions from said tenon (14) forming slots (17, 18) between said dovetail tenon (14) and each said apron (15, 16), said aprons partially covering opposing side walls of said base plate (31) oriented parallel to said dovetail groove (32) when said tool holder (10) is connected to said base plate (31), and wherein one of said base plate (31) and said tool holder (10) is provided in the area of said dovetail connection with arrest serrations (50) running transverse to said insertion direction and the other of said tool holder (10) and said base plate (31) is provided with a stop spring (52) oriented to engage with said arrest serrations (50), thereby providing an additional connection between said base plate (31) and said tool holder (10).

Claim 19

Dependent Claim 26 words

Apparatus as described in claim 16, characterized by said stop spring (52) being attached to a surface of said dovetail groove by a fastening bolt (53).

Claim 20

Dependent Claim 31 words

Apparatus as described in claim 16, characterized by said stop spring (52) having a free end transverse to said insertion direction and bent toward said arrest serrations (50) for engagement therewith.

Claim 21

Dependent Claim 59 words

Apparatus as described in claim 16, characterized by said stop spring (52) being attached to a surface of said dovetail groove of said tool holder (10) by a fastening bolt (53), said stop spring (52) having a free end transverse to the insertion direction and bent toward said arrest serrations (50) on said base plate (31) for engagement therewith.

Claim 22

Dependent Claim 28 words

Apparatus as described in claim 19, characterized by said arrest serrations (50) having front tooth flanks (41) facing insertion direction (43) flatter than adjacent rear tooth flanks (42).

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1990-03-16	1990-09-15	1991-03-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1994-03-16	1994-09-15	1995-03-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1998-03-16	1998-09-15	1999-03-17	$7700.00	Window Closed / Lapsed

Apparatus for retaining a tool in machinery

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