US3920169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving tool mechanism
Assignee: Textron Inc
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Filing: 1974-08-22
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Granted: 1975-11-18
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Expires: 1994-08-22
Abstract
Abstract A mechanism for feeding a strip of metal fasteners to an impact tool for driving the fasteners into a workpiece includes a barrel, a magazine for holding and feeding the strip to a piston in the barrel and a bushing within the barrel. The bushing is adapted to float between a first position where it engages the strip while a fastener is separated from the strip and driven and a second position where it disengages the strip to permit the strip to be advanced by the magazine to align a successive fastener with the driving piston of the impact tool and to exit the used strip through an opening in the barrel. The strip is held between the bushing and the barrel or between the bushing and a portion of the magazine which extends into the barrel.
Inventors
- 👤 Charles J Decaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:28
CPC Classifications
B; B25; B25C; B25C1/00; B25C1/001; B25C1/005
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
158 words
A mechanism for feeding a strip of metal fasteners to an impact tool having a reciprocable piston for driving the fasteners through an impact stroke into a workpiece comprising: A. a barrel including an exit means extending through a wall thereof for attachment to the impact tool; B. a magazine for holding the strip and disposed with respect to the barrel to feed the strip into the barrel in driving position with respect to the piston; and C. a bushing disposed and secured within an end of the barrel and having an end positioned with respect to the strip to retainably engage edges of the strip between the bushing and the barrel wall adjacent the exit means during the impact stroke of the piston to permit separation of the fastener from the edges of the strip and to disengage from the strip after impact to permit advancement of the strip into the barrel and through the exit means.
Claim 2
Dependent Claim
158 words
A mechanism for feeding a strip of metal fasteners to an impact tool having a reciprocable piston for driving the fasteners through an impact stroke into a workpiece comprising: A. a barrel including an exit means extending through a wall thereof for attachment to the impact tool; B. a magazine for holding the strip and disposed with respect to the barrel to feed the strip into the barrel in driving position with respect to the piston; and C. a bushing disposed and secured within an end of the barrel and having an end positioned with respect to the strip to retainably engage edges of the strip between the bushing and the barrel wall adjacent the exit means during the impact stroke of the piston to permit separation of the fastener from the edges of the strip and to disengage from the strip after impact to permit advancement of the strip into the barrel and through the exit means.
Claim 3
Dependent Claim
27 words
The mechanism of claim 1 wherein a rail of the magazine extends into the barrel and the strip is retained between the bushing end and the rail.
Claim 4
Dependent Claim
38 words
A mechanism as set forth in claim 1 wherein the bushing is secured within the barrel by a set screw extending through a wall of the barrel and into a slot formed in a wall of the bushing.
Claim 5
Dependent Claim
33 words
A mechanism as set forth in claim 1 wherein the bushing comprises a tubular shank having an enlarged head positioned outside the barrel and a shank disposed within the barrel of the mechanism.
Claim 6
Dependent Claim
32 words
A mEchanism as set forth in claim 4 including a spring positioned between the enlarged head of the bushing and the barrel so as to urge the bushing into an extended position.
Claim 7
Dependent Claim
63 words
A mechanism as set forth in claim 1 wherein the edges of the strip comprise a pair of plastic rails between which the fasteners to be driven are held, and the bushing includes a tubular shank having cutting edges on its upper end for engaging the strip rails during driving of the fastener by the tool and for facilitating separation of the fastener.
Claim 8
Dependent Claim
69 words
A mechanism as set forth in claim 1 wherein the magazine includes a strip trackway and a feeder mechanism having finger means for engaging the strip and a spring loaded pivotable cam means engageable by a sleeve surrounding the barrel during the impact stroke to slide the finger means rearward over the strip and to permit engagement of the strip thereby for advancement along the trackway into the barrel.
Claim 9
Dependent Claim
30 words
The mechanism of claim 7 wherein the cam means includes a disc off center rotatably connected to the feeder mechanism so as to be adjustable through rotation about the connection.
Claim 10
Dependent Claim
137 words
In a mechanism for feeding metal fasteners to an impact tool for driving into a workpiece, which mechanism comprises a barrel having a reciprocable piston actuatable by the tool and a magazine for feeding a strip of fasteners through an entry slot of the barrel for impacting by the piston, the improvement comprising a bushing comprising a tubular shank having an enlarged head at its lower end, an entry slot in registry with the barrel entry slot and edges on the upper end for holding the strip during impacting, said shank being disposed within the end of the barrel removed from the tool and movable between a first position where the edges engage the strip during impacting of the fastener and a second position after impacting where the edges of the bushing are disengaged from the strip.
Claim 11
Dependent Claim
137 words
In a mechanism for feeding metal fasteners to an impact tool for driving into a workpiece, which mechanism comprises a barrel having a reciprocable piston actuatable by the tool and a magazine for feeding a strip of fasteners through an entry slot of the barrel for impacting by the piston, the improvement comprising a bushing comprising a tubular shank having an enlarged head at its lower end, an entry slot in registry with the barrel entry slot and edges on the upper end for holding the strip during impacting, said shank being disposed within the end of the barrel removed from the tool and movable between a first position where the edges engage the strip during impacting of the fastener and a second position after impacting where the edges of the bushing are disengaged from the strip.
Claim 12
Dependent Claim
58 words
A mechanism as set forth in claim 9 wherein a slot is provided in the shank of said bushing for admitting a fastener to the driving position within the barrel, the bottom of the slot being tapered inwardly toward the center of the bushing to facilitate alignment of the fastener with the piston during driving of the fastener.
Claim 13
Dependent Claim
49 words
A mechanism as set forth in claim 9 wherein said bushing head is threaded to the lower end of the tubular shank whereby the length of the bushing can be changed to maintain the effective length of the stroke despite any change in the length of the driving piston.
Claim 14
Dependent Claim
44 words
A mechanism as set forth in claim 9, said bushing having a slot in the tubular shank adjacent the barrel wall and a screw extending through the wall into the slot in the bushing shank to limit movement of the bushing within the barrel.
Claim 15
Dependent Claim
42 words
The mechanism as set forth in claim 12 wherein said bushing slot is helically formed so that the bushing rotates during movement between the first and second position thereby positioning the bushing entry slot out of registry with the barrel entry slot.
Claim 16
Dependent Claim
40 words
A mechanism as set forth in claim 9, said bushing including a stop means positioned on the end of the shank opposite the head and away from said magazine to stop the movement of the strip between successive impact strokes.
Claim 17
Dependent Claim
21 words
A mechanism as set forth in claim 9 wherein the enlarged head of said bushing includes a contoured work contacting surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |