Electric hammering apparatus with air-cushioned armature

Details Electric hammering apparatus with air-cushioned armature Electric hammering apparatus with air-cushioned armature

1983-06-10

1985-05-07

Bell, Paul A.

Elongated-member-driving apparatus

With means to move or guide member into driving position

Including supply magazine for constantly urged members

227130, 227134, 173121, 173139, B25C 100, B25C 502, B25C 506

Patent

active

045153035

ABSTRACT:
To prevent bounce of a hammer or plunger element coupled to an insertion blade of a stapling or nailing gun upon return of the plunger element to rest position by a spring (11), the plunger element (4) is in cup shape, sliding about a hollow cylinder (6) which is vented to ambient air (8) at one end, but closed at its other end by a flap-type check valve (9). Upon downward movement of the plunger element, for example under electromagnetic force of a solenoid (2), air can flow freely from the vent opening (8) into the hollow interior and through the then open check valve (9); upon return movement under force of a spring (11), the flap valve (9) will close, however, thus forming an air cushion or air damper and preventing rapid, uncontrolled return of the plunger element to rest position, due to an air throttling path (19) between the outside of the hollow cylinder and the inner surface of the plunger element (4), said air throttling path being defined by the operating clearance between the plunger (4) and the hollow cylinder (6). The hollow cylinder (6) may be constructed as a guide element, unitary with the valve, and made of plastic, the valve being secured by a living hinge to the remainder of the hollow cylinder.

REFERENCES:
patent: 1853695 (1932-04-01), Mortimer
patent: 4183453 (1980-01-01), Barrett et al.
patent: 4441644 (1984-04-01), Farian

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