US Patent: 1,938,233
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| Broaching Machine
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| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 11, 1931 |
| Granted: |
Dec. 05, 1933 |
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Joel Havens
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Description: |
| Parker & Prochnow - patent attorneys
This invention relates to improvements in machines for broaching or performing analogous operations upon metal blanks or articles. Broaching machines are ordinarily provided with a reciprocating broach or tool, usually mounted for vertical movement, and having one or more of its side faces provided with teeth for cutting away portions of the blanks or articles, hereinafter termed "blanks". The blanks are usually arranged singly on the machine, clamped in a holder or otherwise, so as to be positioned in the path of movement of, or presented to the breach or tool to be operated upon thereby. Such procedure is relatively slow and expensive, and it is an object of the present invention to provide a machine of novel construction for operating upon blanks in which a number of such blanks can be quickly placed and secured in like position for simultaneous presentation to and operation upon by the broach or tool. Other objects are to provide an improved holder for the blanks which is movably mounted upon the machine so that a number of blanks can be easily and quickly placed in corresponding positions thereon and secured in place under fully accessible conditions and at one side of the tool, thereby permitting the tool to reciprocate continuously without- requiring the attention of the operative to intermittently actuate the same, effecting a saving in time, and allowing the operative to work in a safe manner; also to construct and mount the holder so that after said blanks have been positioned and secured thereon, said holder can be instantly moved into operative position for presenting the blanks to the tool; also to provide a safety device of exceedingly simple and inexpensive construction, which is positive in action, durable and reliable in use, and which preferably may be mounted directly on the blank holder, and cooperates with the tool in a manner to permit the holder to assume its operative relation to the tool only when the latter is at the beginning of its working stroke; which engages the tool and retains the holder in a position in which the blanks are clear of the tool in the event that the holder is moved towards its operative position after the tool has started its stroke in either direction, and which can also be actuated by the tool to shift the holder away from the tool to place the blanks in clearance position at the commencement of the return stroke of the tool, or after the toll has performed its work upon the blanks. |
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