Expansible chamber devices – With releasable stop or latch means to prevent movement of... – Includes interfitting parts engageable at plural positions...
Patent
1974-07-24
1976-07-20
Schwadron, Martin P.
Expansible chamber devices
With releasable stop or latch means to prevent movement of...
Includes interfitting parts engageable at plural positions...
92 26, 92 30, 227130, F15B 1526
Patent
active
039699889
ABSTRACT:
An impact drive tool is provided with a percussive piston arranged in a cylinder. A rod on the piston is mounted to drive a nail or other object into a workpiece. A valve arrangement is provided to apply compressed air to the upper surface of the piston, and a storage chamber communicating with the space below the piston is provided for returning the piston to a rest position. A plurality of sequentially arranged latching devices are provided for locking the piston in its rest position, the latching device effective at a given time being dependent on such factors as friction in the device and the amount of compressed air stored for the return stroke. A buffer surface is provided to effect the absorption of energy if the piston passes all of the latching devices, and to rebound the piston to the nearest latching device.
REFERENCES:
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patent: 2559478 (1951-07-01), Stone
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patent: 3104395 (1963-09-01), Grey, Jr. et al.
patent: 3188921 (1965-06-01), Bade
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patent: 3397617 (1968-08-01), Cast et al.
Fasse W. G.
Hershkovitz Abraham
Karl M. Reich Maschinenfabrik GmbH
Roberts W. W.
Schwadron Martin P.
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