US 4,867,366 AGranted

Pneumatic fastener-driving tool and method

OwnerEdward O. Kleinholzinventor

Life of this patent

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Abstract

A pneumatically operated fastener-driving tool, particularly adapted for nailing drywall to the framing of a building, comprising a housing, a reciprocator assembly mounted within the housing, and a piston mechanism mounted within the reciprocator 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.

Claims22

Dependent claims

A fastener driving tool comprising:

(a) a housing;
(b) a reciprocator assembly mounted for linear movement within said housing;
(c) means for pneumatically driving fasteners in a single strokes into a workpiece, at least a portion of said fastener driving means being mounted within said reciprocator assembly for parallel linear movement relative thereto;
(d) means for pneumatically actuating said fastener driving means forwardly through a driving stroke and simultaneously reactively actuating said reciprocator assembly rearwardly within said housing whereby rearward recoil of said housing during said driving stroke is substantially eliminated;
(e) means carried by said reciprocator assembly for cooperating with said fastener driving means by impingement therewith to dissipate recoil energy of said reciprocator assembly with but slight impingement of said reciprocator assembly upon said housing, whereby rearward recoil of said housing subsequent to said driving stroke is significantly reduced;
and
(f) dimpler means for forming a rounded dimple in a workpeice as the fastener is being driven thereinto, said dimple circumscribing the driven fastener wherein said dimpler means include an elongated dimple member carried by said housing for a limited longitudinal movement parallel to said linear movement of said reciprocator assembly, said dimple member having an inner end positioned to be struck by said fastener driving means during said driving stroke, and a tapered outer end positioned to be driven into a workpeice to from said dimple, said outer end of said dimple member having a workpeice engaging surface having two areas making two respectively distinctly different angles with the axis of movement of said dimple member, whereby uniform dimples may be formed despite tilting of said tool and the axis of movement of said fastener driving means relative to the surface of a workpeice in which a dimple is to be formed.

4 more elements

A fastener driving tool comprising:

(a) an outer housing;
(b) a reciprocator assembly mounted for linear movement within said housing, said reciprocator assembly containing an inner cylinder;
(c) means, including a fastener driving piston mounted for linear movement within said inner reciprocator cylinder, for pneumatically driving fasteners into objects to be secured together;
(d) means for simultaneously actuating said fastener driving piston in one direction through a driving stroke and said reciprocator assembly in an opposite direction, whereby fasteners are driven without significant recoil being transmitted to said housing during said driving stroke;
(e) means for mounting said driving piston for linear movement along an axis which is parallel to but substantially displaces in one direction from the axis of movement of said reciprocator assembly;
(f) means secured to said reciprocator assembly for engaging said piston subsequent to said driving stroke to aid in stopping the oppositely moving reciprocator assembly;
(g) dimpler means for providing a rounded surface dimple in one of the objects around a fastener as the fastener is driven;
and
(h) structural means for guiding and locating said tool to drive fasteners into the wall of a room within one inch of the corner of a room, with the fasteners being angled toward the corner of the room, said structural means including a tapering of the housing toward the driving end of the tool to provide a close approach and a slight angling of the driving axis of the tool toward the corner of a room.

6 more elements

A fastener driving tool comprising:

(a) a housing;
(b) a reciprocator assembly mounted for linear movement within said housing;
(c) means for pneumatically driving fasteners into a workpiece, at least a portion of said fastener driving means being mounted within said reciprocator assembly for parallel linear movement relative thereto;
(d) means for pneumatically actuating said fastener driving means forwardly through a driving stroke and simultaneously reactively actuating said reciprocator assembly rearwardly within said housing, whereby rearward recoil of said housing during said driving stroke is substantially eliminated;
(e) means carried by said reciprocator assembly for cooperating with said fastener driving means by impingement therewith to dissipate recoil energy of said reciprocator assembly with but slight impingement of said reciprocator assembly upon said housing, whereby rearward recoil of said housing subsequent to said driving stroke is significantly reduced;
(f) dimpler means for forming a rounded dimple in a workpiece as a fastener is being driven thereinto, said dimple circumscribing the driven fastener, wherein said dimpler means include an elongated dimpler member carried by said housing for limited longitudinal movement parallel to said linear movement of said reciprocator assembly, said dimpler member having an inner end positioned to be struck by said fastener driving means during said driving stroke, and a tapered outer end positioned to be driven into a workpiece to form said dimple;
and
(g) resilient means for preventing rigid collision between said fastener driving means, said dimpler means, said reciprocator assembly, and said housing upon actuation of said tool wherein said resilient means comprises a bumper positioned adjacent the forward end of said reciprocator assembly, said inner end of said dimpler member is positioned between said bumper and said piston, said dimpler member has a transverse external flange positioned forwardly of said bumper, and said housing has an internal shoulder circumscribing and being positioned forwardly of said flange, and wherein said resilient means include said bumper and further comprise:
(1) a first resilient member mounted on said inner end of said dimpler member;
and
(2) a second resilient member interposed between said flange and said internal shoulder.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/821,870Filed 23 Jan 1986 · continuation in part
Priority: 24 Apr 1978
Granted: 19 Sep 1989
Term ends: Not estimatedThe source records don’t support an estimate.

Classification2 codes

B25C 1/044
Operated by fluid pressure , e.g. by air pressure: with movable main cylinder
B25C
Hand-held nailing or stapling tools

Family

Serial899,514Parent of this continuation · filed 24 Apr 1978
Serial84,367Parent of this continuation-in-part · filed 12 Oct 1979
Serial171,720Parent of this continuation · filed 24 Jul 1980
Serial664,944Parent of this continuation-in-part · filed 26 Oct 1984
US 4,566,619 AParent of this continuation-in-part
US 4,867,366 AThis patent

From the US filing history. Foreign family members aren’t listed.