Patent US3776444A successfully refreshed from Google Patents.
US3776444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loop fastener gun assembly
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1971-06-21
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Granted: 1973-12-04
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Expires: 1991-06-21
Abstract
Abstract A loop type fastening mechanism which utilizes an air operated plunger which pushes the fastener into engagement with the support.
Inventors
- 👤 D Kuehn
- 👤 J Lyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:43
CPC Classifications
B; B25; B25C; B25C1/00; B25C1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
248 words
Apparatus for attaching a fastener to a support, said apparatus comprising housing means forming a fluid chamber and an inner passage having one end communicating with an end portion of said chamber, a chuck carried by said housing means at the opposite end of said passage, means behind said chuck and opening into said passage for directing a fastener into said passage and toward said chuck, a plunger in said passage behind said chuck and adapted to be moved within said passage, a rod connected with said plunger and extending rearwardly into said fluid chamber, a piston connected to said rod within said fluid chamber, said housing means having means to receive fluid under pressure into said fluid chamber on the side of said piston opposite said rod, stop means having a first position extending into said passage to engage a portion of said rod intermediate said piston and said plunger to position said plunger adjacent said chuck to engage a fastener held by said chuck with said piston being in an intermediate position in said fluid chamber spaced from said one end of said inner passage and spaced from said fluid receiving means, and having a second position clear of said passage, and trigger means adapted to move said stop means from said first position to said second position to enable said plunger to move from the position adjacent said chuck substantially through said chuck to push a fastener out of the chuck and into the support.
Claim 2
Dependent Claim
248 words
Apparatus for attaching a fastener to a support, said apparatus comprising housing means forming a fluid chamber and an inner passage having one end communicating with an end portion of said chamber, a chuck carried by said housing means at the opposite end of said passage, means behind said chuck and opening into said passage for directing a fastener into said passage and toward said chuck, a plunger in said passage behind said chuck and adapted to be moved within said passage, a rod connected with said plunger and extending rearwardly into said fluid chamber, a piston connected to said rod within said fluid chamber, said housing means having means to receive fluid under pressure into said fluid chamber on the side of said piston opposite said rod, stop means having a first position extending into said passage to engage a portion of said rod intermediate said piston and said plunger to position said plunger adjacent said chuck to engage a fastener held by said chuck with said piston being in an intermediate position in said fluid chamber spaced from said one end of said inner passage and spaced from said fluid receiving means, and having a second position clear of said passage, and trigger means adapted to move said stop means from said first position to said second position to enable said plunger to move from the position adjacent said chuck substantially through said chuck to push a fastener out of the chuck and into the support.
Claim 3
Dependent Claim
45 words
Apparatus according to claim 1 characterized by resilient means carried by said housing for urging said piston toward the end of said fluid chamber opposite said inner passage, with said plunger then being positioned on the side of said fastener directing means opposite said chuck.
Claim 4
Dependent Claim
55 words
Apparatus according to claim 1 characterized by said portion of said rod engaged by said stop means constituting a shoulder on said rod effective to be engaged by said stop means when said rod is moving toward saId chuck but not effective to be engaged by said stop means when moving in the opposite direction.
Claim 5
Dependent Claim
225 words
A fastener attaching tool comprising a housing forming a fluid chamber and an inner passage having one end communicating with said chamber, a chuck carried by said housing means and communicating with the opposite end of said passage, means forming a side port communicating with said passage for directing a fastener into said passage toward said chuck, a plunger in said passage and adapted to reciprocate therein, a piston in said fluid chamber, means connecting said plunger and said piston, said housing means having means to receive fluid under pressure into said fluid chamber on the side of said piston opposite said plunger, said connecting means having engageable means, stop means having a first position extending into said passage and engageable with said engageable means to hold said plunger adjacent said chuck beyond said side port with said piston being in an intermediate position in said fluid chamber spaced from said one end of said inner passage and spaced from said fluid receiving means, and having a second position clear of said passage, and trigger means connected with said stop means and adapted to move said stop means from said first position to said second position and out of engagement with said engageable means, whereby said plunger can be moved into said chuck to push the fastener out of the chuck and into a workpiece.
Claim 6
Dependent Claim
225 words
A fastener attaching tool comprising a housing forming a fluid chamber and an inner passage having one end communicating with said chamber, a chuck carried by said housing means and communicating with the opposite end of said passage, means forming a side port communicating with said passage for directing a fastener into said passage toward said chuck, a plunger in said passage and adapted to reciprocate therein, a piston in said fluid chamber, means connecting said plunger and said piston, said housing means having means to receive fluid under pressure into said fluid chamber on the side of said piston opposite said plunger, said connecting means having engageable means, stop means having a first position extending into said passage and engageable with said engageable means to hold said plunger adjacent said chuck beyond said side port with said piston being in an intermediate position in said fluid chamber spaced from said one end of said inner passage and spaced from said fluid receiving means, and having a second position clear of said passage, and trigger means connected with said stop means and adapted to move said stop means from said first position to said second position and out of engagement with said engageable means, whereby said plunger can be moved into said chuck to push the fastener out of the chuck and into a workpiece.
Claim 7
Dependent Claim
42 words
Apparatus according to claim 4 characterized by resilient means in said fluid chamber engageable with said piston to urge said piston to a position in said chamber such that said plunger is to the side of said fastener port opposite said chuck.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |