US 5,252,012 AGranted

Positive lock broach puller

AssigneeThe Cross Company

InventorsJoseph E. Suminski, James R. Uber

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Abstract

A clamping jaw arrangement for a broach puller assembly is described in which first and second jaw sets are engaged with the end face and one side of the annular groove of the broach tool. The second jaw set initially engages one side of the annular groove and is locked in position with an associated spring urged operating sleeve, and upon lifting of the broach tool in reaction to engagement with the workpiece, the first jaw set moves radially inward and is held against the chamfered end face of the tool to eliminate all axial play while ensuring proper seating of the jaw elements in each set.

Claims10

Dependent claims

A broach puller assembly for an elongated broach tool having an end section formed with an end face and an annular groove in said end section closely spaced from said end face, said end face having a chamfered surface, said annular groove defined by an annular side adjacent said end face inclined with respect to the length of said broach tool, said broach puller assembly comprising:

a puller body having a bore defined therein adapted to slidably receive said broach tool end section;
a first set of jaw elements;
each jaw element in said first set slidably disposed in a radial opening entering said bore, each jaw element having a radially inmost engagement portion inclined to be adapted to engage said chamfered surface of said end face of said broach tool to be forced radially outward in which said jaw elements still underlie said end face of said broach tool to be determined radially expanded position;
each first set jaw elements having a radially outermost tail portion;
first jaw set operating means acting on said tail portion of each of said first set of jaw elements urging said first set of jaw elements radially inward and locking said first set jaw elements in a radially inmost position;
a second set of jaw elements having a radially inmost engagement portion and radially outer most tail portion, each second jaw set jaw element slidably disposed in a radial opening entering said bore in said puller body at a location whereat said engagement portion of each respective second jaw set jaw element enters into said annular groove of said broach tool with a clearance between a lower side of said respective second set jaw element and said annular side of said broach tool adjacent said end face when said end face is abutted against said first set jaw elements in said predetermined radially expanded position;
second jaw set operating means urging said second jaw set jaw elements radially inward, and locking said second set jaw elements in a radially inmost position;
means holding said first and second jaw set operating means to allow said first and second jaw set jaw elements to be moved to a radially expanded position upon insertion of said broach tool into said bore;
said second jaw set operating means including means initially forcing said second jaw set elements radially inward into said annular groove after insertion of said broach tool, and locking the same therein;
shifting of said broach tool to bring said one side of said annular groove subsequently allowing said first jaw set operating means to move said first jaw set jaw elements radially inward to abut against said chamfered end face of said shifted broach tool, whereby said second jaw set and said first jaw set are successively engaged with said broach tool.

7 more elements

Dependencies are inferred from the claim text.

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Abstract

a puller body having a bore defined therein adapted to slidably receive said broach tool end section;
a first set of jaw elements;
each jaw element in said first set slidably disposed in a radial opening entering said bore, each jaw element having a radially inmost engagement portion inclined to be adapted to engage said chamfered surface of said end face of said broach tool to be forced radially outward in which said jaw elements still underlie said end face of said broach tool to be determined radially expanded position;
each first set jaw elements having a radially outermost tail portion;
first jaw set operating means acting on said tail portion of each of said first set of jaw elements urging said first set of jaw elements radially inward and locking said first set jaw elements in a radially inmost position;
a second set of jaw elements having a radially inmost engagement portion and radially outer most tail portion, each second jaw set jaw element slidably disposed in a radial opening entering said bore in said puller body at a location whereat said engagement portion of each respective second jaw set jaw element enters into said annular groove of said broach tool with a clearance between a lower side of said respective second set jaw element and said annular side of said broach tool adjacent said end face when said end face is abutted against said first set jaw elements in said predetermined radially expanded position;
second jaw set operating means urging said second jaw set jaw elements radially inward, and locking said second set jaw elements in a radially inmost position;
means holding said first and second jaw set operating means to allow said first and second jaw set jaw elements to be moved to a radially expanded position upon insertion of said broach tool into said bore;
said second jaw set operating means including means initially forcing said second jaw set elements radially inward into said annular groove after insertion of said broach tool, and locking the same therein;
shifting of said broach tool to bring said one side of said annular groove subsequently allowing said first jaw set operating means to move said first jaw set jaw elements radially inward to abut against said chamfered end face of said shifted broach tool, whereby said second jaw set and said first jaw set are successively engaged with said broach tool.

7 more elements