Handle mechanism

Claim 2

A handle mechanism for machine tools having a manually rotatable shaft, comprising: an indexing fixture having an indexing plate and a sleeve portion fixedly mountable on a manually rotatable shaft; a frame member including a yoke portion with a pair of spaced arm portions extending from a body portion, and including a block portion restrictively pivotally mounted in said yoke portion and rotatably mounTed in a fixed axial position on said sleeve portion of said indexing fixture, said block portion being pivoted along a pivotal axis lying adjacent a first end thereof and adjacent the end extremities of said arm portions; indexing means operatively coupled to said yoke portion and to said block portion and including an indexing pin registerable with said indexing fixture for locking said frame member to said indexing fixture when said yoke portion is in a predetermined pivotal relationship to said block portion, said indexing pin being axially movable along the line orthogonal to said pivotal axis; and handle means mounted on said yoke portion for pivoting said yoke portion with respect to said block portion to engage and disengage said indexing pin from said indexing fixture and for rotating said indexing fixture only when said yoke portion is in said predetermined relationship.

Claim 3

The mechanism according to claim 1, wherein said sleeve portion is circular in cross-section, and wherein said block portion includes a circular opening therein extending into said block portion along an axis orthogonal to said pivotal axis dimensioned to slidably accept said sleeve portion.

Claim 4

The mechanism according to claim 2, wherein said sleeve portion includes a circular groove in its outer surface, and wherein said block portion includes a guide pin extendable into said groove.

Claim 5

The mechanism according to claim 3, wherein said block portion includes a cylindrical cavity and said indexing pin is slidably disposed in said cavity and includes an elongated rod portion with a notch in its outer cylindrical surface, wherein said indexing means includes a locating pin extending from said yoke portion through an elongated slot in said block portion and registering in said notch whereby said indexing pin is moved axially with relative movement between said block and yoke portions and is extendable beyond said block portion towards said indexing fixture.

Claim 6

The mechanism according to claim 4, wherein said indexing fixture includes an indexing flange portion essentially perpendicular to the axis of rotation of said sleeve portion, said indexing flange portion having a flat annular surface facing said sleeve portion and symmetrically positioned indexing indentations lying in a circle coaxial with said axis of rotation and each dimensioned to accept said indexing pin.

Claim 7

The mechanism according to claim 5, wherein said block portion includes a broad face surface through which said opening and said cavity extend, said broad face surface being slidably positionable adjacent said flat annular surface.

Claim 8

The mechanism according to claim 6, wherein said yoke portion includes a flat surface lying in essentially a common plane with a broad face surface of said block portion when said portions are in said pre-determined relationship.

Claim 9

A handle mechanism for machine tools having a manually rotatable shaft, comprising: indexing fixture means mountable on a manually rotatable shaft of a machine tool for rotating the shaft, said indexing fixture means including a circular sleeve portion having at least one circular groove in an outer surface thereof and also including a transversely disposed indexing flange portion having a flat annular surface facing said sleeve portion, said annular surface including symmetrically positioned indexing indentations lying in a circle coaxial with the longitudinal axis of said sleeve portion; a yoke member having two spaced arms extending from a body portion; a block member having a planar surface and a circular opening in said planar surface extending into said block member along an axis perpendicular to said planar surface and dimensioned to slidably accept said circular sleeve portion, said block member being pivotally mounted between said arms of said yoke member and including guide pin means extendable into said circular groove in said circular sleeve portion for restricting axial movement of said block member with respEct to said circular sleeve portion while allowing unrestricted relative rotational movement, said block member also including an elongated pin chamber communicating with said planar surface adjacent an inner end thereof and having a longitudinal axis essentially parallel to said axis of said opening, said block member further including an elongated slot in an end surface which communicates with and is parallel to said pin chamber; an elongated indexing pin member slidably disposed in said pin chamber, said pin member having a notch in a side surface thereof; a locating pin extending from said yoke member and into said elongated slot in said block member and registering in said notch in said indexing pin member; and handle means attached to said yoke member for pivoting said yoke member with respect to said block member from a position in which said indexing pin member extends beyond said planar surface of said block member into said indexing indentations of said rotatable shaft mounted indexing flange portion to a position in which said indexing pin member is pulled by said locating pin back within said block member to a non-protruding location to rotatively free said yoke member from said indexing fixture means.

Claim 10

A handle mechanism for machine tools having a manually rotatable shaft, comprising: indexing fixture means mountable on a manually rotatable shaft of a machine tool for rotating the shaft, said indexing fixture means including a circular sleeve portion having at least one circular groove in an outer surface thereof and also including a transversely disposed indexing flange portion having a flat annular surface facing said sleeve portion, said annular surface including symmetrically positioned indexing indentations lying in a circle coaxial with the longitudinal axis of said sleeve portion; a yoke member having two spaced arms extending from a body portion; a block member having a planar surface and a circular opening in said planar surface extending into said block member along an axis perpendicular to said planar surface and dimensioned to slidably accept said circular sleeve portion, said block member being pivotally mounted between said arms of said yoke member and including guide pin means extendable into said circular groove in said circular sleeve portion for restricting axial movement of said block member with respEct to said circular sleeve portion while allowing unrestricted relative rotational movement, said block member also including an elongated pin chamber communicating with said planar surface adjacent an inner end thereof and having a longitudinal axis essentially parallel to said axis of said opening, said block member further including an elongated slot in an end surface which communicates with and is parallel to said pin chamber; an elongated indexing pin member slidably disposed in said pin chamber, said pin member having a notch in a side surface thereof; a locating pin extending from said yoke member and into said elongated slot in said block member and registering in said notch in said indexing pin member; and handle means attached to said yoke member for pivoting said yoke member with respect to said block member from a position in which said indexing pin member extends beyond said planar surface of said block member into said indexing indentations of said rotatable shaft mounted indexing flange portion to a position in which said indexing pin member is pulled by said locating pin back within said block member to a non-protruding location to rotatively free said yoke member from said indexing fixture means.