US 4,566,619 A · Pneumatic fastener-driving tool and method

Abstract

A pneumatically operated fastener-driving tool, particularly adapted for nailing drywall to the framing of a building, includes a housing, a reciprocator assembly mounted within the housing, and a piston mechanism mounted within the reciprocating assembly for axially driving the fastener into the drywall and underlying framing member. Upon actuation of the tool, the piston is pneumatically driven through a fastener-driving stroke and the reciprocator is reactively driven in an opposite direction. The oppositely driven reciprocator assembly absorbs recoil energy during the piston's driving stroke without transmitting an appreciable amount thereof to the housing, thereby substantially precluding housing recoil during driving of the fastener. At the end of the driving stroke, the reciprocator engages and is decelerated by the piston, thereby reducing housing recoil subsequent to the driving of the fastener. At the end of its driving stroke, the piston mechanism recesses the fastener in the drywall and engages a dimpler member to form a shallow recess around the driven fastener.

Claims20

Dependent claims

Apparatus for effecting single-stroke driving of a fastener into a workpiece, said apparatus comprising:

(a) a relatively light-weight, portable housing,
(b) piston means movably mounted in said housing and associated with fastener-driver means for single-stroke driving of a fastener into a workpiece when said piston means is pneumatically actuated in a direction toward said workpiece,
(c) means to deliver high-pressure air to the side of said piston means remote from said workpiece, to thus effect said pneumatic actuation,
(d) reciprocator means movably mounted in said housing for movement in a direction away from said workpiece in response to said delivery of high-pressure air, and
(e) means, operative when (1) said fastener has been substantially completely driven into said workpiece, and (2) said reciprocator means is moving in a direction away from said workpiece to provide a mechanical stopping relationsip between said piston means and said reciprocator means,
said mechanical stopping relationship being such that said piston means, when at or near the bottom of its stroke and relatively adjacent said workpiece, provides at least a substantial degree of stopping action on said thus-moving reciprocator means.

3 more elements

Dependencies are inferred from the claim text.

Pneumatic fastener-driving tool and method

Life of this patent

Pneumatic fastener-driving tool and method

Life of this patent

Abstract

Claims20