Portable drill with power drawbar clamping device

Claim 2

In combination, a portable power drill having a drilling axIs and a pneumatically operated work clamping device, comprising a base mounted on the drill and extending laterally of the drilling axis thereof, a piston-cylinder unit mounted on said base and including a stationary element and a movable element, a cam carried by the movable element, a work clamping assembly extending parallel to the drilling axis of the drill and including an axially movable pilot drawbar means, and a lever pivotally mounted between and operably engageable with said cam and said drawbar means for pulling said drawbar means in response to given directional movement of said cam.

Claim 3

The device set forth in claim 1 in which spring means is provided yieldably resisting pivotal movement of the lever in a direction to pull the drawbar means.

Claim 4

In combination, a portable power drill having a drilling axis and a pneumatically operated work clamping device for a portable drill, comprising a base mounted on the drill and extending laterally of the drilling axis thereof, a piston-cylinder unit mounted on the base and including a stationary cylinder and movable piston with a piston rod, a cam on said rod, a work clamping assembly extending generally parallel to the drilling axis and including an axially movable pilot drawbar means, a lever pivotally mounted between said cam and drawbar means, said lever being operably connected to the drawbar means at one end and operably engageable with the cam at the other end, and spring return means yieldably resisting movement of said lever and drawbar means by said cam.

Claim 5

In combination, a portable power drill having a drilling axis and a pneumatically operated work clamping device for a portable drill, comprising a base mounted on the drill and extending laterally of the drilling axis thereof, a piston-cylinder unit mounted on the base and including a stationary cylinder and movable piston with a piston rod, a cam on said rod, a work clamping assembly extending generally parallel to the drilling axis and including an axially movable pilot drawbar means, a lever pivotally mounted between said cam and drawbar means, said lever being operably connected to the drawbar means at one end and operably engageable with the cam at the other end, and spring return means yieldably resisting movement of said lever and drawbar means by said cam.

Claim 6

The device set forth in claim 3 in which the axis of said piston rod is parallel to and laterally offset from the axis of said drawbar means, and in which said lever is a bell crank.

Claim 7

The device set forth in claim 4 in which said lever has a cam follower roller at one end and is bifurcated at the other end to receive the drawbar means at the other end, and in which said drawbar means is provided with a roller at each side for engagement by said other end of said lever.

Claim 8

A power device for pulling a drawbar or the like a limited distance and subsequently holding the same against return movement, comprising: a. a body providing a cylindrical chamber; b. a piston in the chamber having a piston rod; c. a cam carried by said piston rod; d. an axially movable drawbar means mounted in said body laterally of said cam; e. a bell crank-like lever pivotally mounted in said body laterally of said cam and operably engageable with said cam and said drawbar means for pulling said drawbar means in response to given directional movement of said cam; and f. spring means connected to said bell crank-like lever for yieldably resisting pivotal movement of said bell crank-like lever in a direction to pull said drawbar means.

Claim 9

A power device for pulling a drawbar or the like a limited distance and subsequently holding the same against return movement, comprising: a. a body providing a cylindrical chamber; b. a piston in the chamber having a piston rod; c. a cam carried by said piston rod; d. an axially movable drawbar means mounted in said body laterally of said cam; e. a bell crank-like lever pivotally mounted in said body laterally of said cam and operably engageable with said cam and said drawbar means for pulling said drawbar means in response to given directional movement of said cam; and f. spring means connected to said bell crank-like lever for yieldably resisting pivotal movement of said bell crank-like lever in a direction to pull said drawbar means.

Claim 10

A power device as defined in claim 6 in which said bell crank-like lever is bifurcated at one end to receive said drawbar means and in which said drawbar means is provided with a roller at each side for operable engagement by the bifurcated end of said bell crank-like lever.

Claim 11

A power device as defined in claim 7 in which the axis of said drawbar means is parallel to and laterally offset from the axis of said piston rod and in which the pivot point of said bell crank-like lever is disposed between said drawbar means and said cam.