US1346978A - Tool-holder - Google Patents

Description

J. 1. RILEY AND E. E. BLACKSTONE.

Patented July 20, 1920.

UNITED sTATEs PATENT OFFICE.

JOSHUA J. RILEY AND ELMER E. BLACKSTONE', OF PONTIAC, MICHIGAN.

' TOOL-HOLDER.

To all whom it may concern:

Be it known that we, JOSHUA J. RILEY and ELMER' E. BLAoKsroNn, citizens of the United States, residing at Pontiac, in the county of Oakland and State of Michigan, have invented certain new and useful Improvements in Tool-Holders, of which the following is a specification.

This invention relates to tool holders for retaining a reciprocating tool, such as a chipping chisel. Ordinarily a chipping chisel has heretofore been placed in a guide operated in connection with a pneumatic hammer and the tool has been prevented from dropping out of the holder by letting the same play through the operators hand. Some devices have been designed to hold the tool in place but so far as we know they have not been very generally used.

It is the object of the present invention to provide a tool retainer which also operates as a handle with which to manipulate the holder. As long as this handle is utilized to hold the tool to the work, the pressure against the handle for this purpose also keeps the retainer in engagement with the tool. Whenever the holder is lifted, the operator by simply drawing back on this handle, can disengage the retainer from the tool and the tool will drop out of the holder. These and other objects will appear when the detailed description is understood.

In the drawings,

Figure 1 is a top plan view of a tool holder equipped with the tool retainer.

Fig. 2 is a rear elevation of the holder.

Fig. 8 is a longitudinal section of the holder.

Fig. 4 is a perspective of the tool-retaining fork.

a designates the barrel of the tool holder which may be bolted to the pneumatic hammer through the bolt holes I) of the flange 0, or may be secured in any other way thereto. This barrel has an enlarged opening d at its inner end adapted to accommodate the impact member c of the pneumatic hammer while the outer end of the barrel is provided with a narrow opening f in which is guided the chipping-chisel g. This is ordinarily held in the hand, the tool being allowed to play through the hand.

Our improvement consists in casting integral with the barrel a pair of trunnion lugs it between which is pivoted the com bined retaining fork and handle 2', which has Specification of Letters Patent.

Patented July 20, 1920.

Serial No. 333,835.

a forked portion j adapted to fit into the opening in the side of the barrel and allow the forked portions to engage over the flatted sides is of the chipping chisel The length of these flatte'd sides is as much greater than the width of the forked portions as the desired range of movement of the chipping chisel.

The combined fork and handle is really a bell crank so that a pushing movement on the handle portion 71 serves to keep the fork in engagement with the barrel. The handlev portion 2' forms a very convenient arrangement for holding the tool to the work for obviously considerable pressure may be eX- erted against this handle a to hold the tool holder and tool against the work, whereas if the holder has to be grasped at the end and the tool allowed to play through the hand, practicalfy the entire pressure of holding the apparatus against the work has had to be exerted upon the hand that holds and controls the action of the pneumatic hammer. This improvement presents a handle which allows the operator to push against it to hold the tool to the work and which at the same time serves to control the retention or the dropping of the tool. When it is desired to lift the tool from the work, most ofthe lifting action can be exerted by the hand that is holding the pneumatic hammer,

the other hand simply keeping the combined.

fork and handle from disengaging the tool. If it is desired to drop the chipping chisel or other tool, this may be done with a minimum of trouble by simply lifting on the handle i which immediately drops the tool. No springs, catches or other devices are necessary. convenient handle for holding the tool to the work is provided and at the same time absolute control over the retention or the release of the tool.

lVhat we claim is:

1. A tool holder for the purpose specified, having in combination, a barrel adapted to guide a tool, a tool reciprocatable in said barrel and provided with a recess at its sides, a tool retainer in the form of a bell crank pivoted to the barrel and having a portion at one end adapted to engage loosely in the recess of the tool but allow the tool to reciprocate, the other end of the bell crank forming a handle, pressure against which serves both to hold the tool to the work and the fork in engagement with the tool recess.

2. A tool holder for the purpose specified,

vend with a fork adapted to straddle the flatted sides of the tool but allow limited reciprocation of the'tool, the other end or the bell crank forming a handle, pressure upon which serves to both hold the tool against the work and the fork in engagement with the tool.

3. In a 'tool for the purpose specified, the combination of a barrel provided with a longitudinal opening, a tool having flatted sides reciprocatable through the said opening, the said barrel provided with an opening in its side adjacent the position occupied by the flatted sides ofthe tool, and a tool retainer in theform of a bell crank pivoted to the barrel and having a fork'adapted to pass through the opening in the side of the barrel and retain the tool by straddling the flatted sides but allow limited reciprocation of the tool, the'other end of the bell crank being in the forin of a handle, pressure against which serves both to hold the tool 7 against the work and the retainer in engagement with the tool. r p

In testlmony whereof we ailiX our signa- JOSHUA J. RILEY. ELMER E. BLACKSTONE.

V tures.

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