US3978576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nail extractor
Assignee: GLENTORE TIMBER PRODUCTS Ltd
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Filing: 1975-04-21
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Granted: 1976-09-07
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Expires: 1995-04-21
Abstract
Abstract An extractor for nails comprising a cylinder, a piston reciprocable in said cylinder under the influence of fluid pressure, a pair of gripping jaws located externally of said cylinder, at least one of which jaws is movable between nail gripping and non-gripping positions as a result of mechanical interaction between said piston and said movable jaw or jaws upon displacement of said piston towards and away from said jaws under the action of fluid pressure.
Inventors
- 👤 Jack Mustoe, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:45
CPC Classifications
B; B25; B25C; B25C11/00; B25C11/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
119 words
An extractor for nails comprising a cylinder, an end plate at each end of said cylinder, piston means reciprocable in said cylinder under the influence of fluid pressure, a center shaft disposed coaxially with a longitudinal axis of said cylinder and secured at one end to one of said plates, said shaft passing through the other one of said end plates, and a pair of gripping jaws located at the other end of said shaft, at least one of said jaws being movable between nail gripping and non-gripping positions as a result of mechanical interaction between said piston means and said movable jaws upon displacement of said piston with respect to said jaws under the action of fluid pressure.
Claim 2
Dependent Claim
119 words
An extractor for nails comprising a cylinder, an end plate at each end of said cylinder, piston means reciprocable in said cylinder under the influence of fluid pressure, a center shaft disposed coaxially with a longitudinal axis of said cylinder and secured at one end to one of said plates, said shaft passing through the other one of said end plates, and a pair of gripping jaws located at the other end of said shaft, at least one of said jaws being movable between nail gripping and non-gripping positions as a result of mechanical interaction between said piston means and said movable jaws upon displacement of said piston with respect to said jaws under the action of fluid pressure.
Claim 3
Dependent Claim
15 words
An extractor as claimed in claim 1, wherein the piston and cylinder is air actuated.
Claim 4
Dependent Claim
15 words
An extractor as claimed in claim 1, wherein a movable gripping jaw is pivotally mounted.
Claim 5
Dependent Claim
16 words
An extractor as claimed in claim 1, wherein said gripping jaws are rotatable by power means.
Claim 6
Dependent Claim
55 words
An extractor as claimed in claim 1, further comprising a sleeve provided on said piston and coaxially surrounding said shaft, said sleeve projecting from said cylinder at any position of said piston, a sleeve lower end being adapted to engage over said gripping jaws to urge said at least one movable jaw into gripping position.
Claim 7
Dependent Claim
35 words
An extractor as claimed in claim 5, wherein both said gripping jaws are movable, being located on pivot pins carried by said centre shaft, a common compression spring urging said jaws away from one another.
Claim 8
Dependent Claim
52 words
An extractor as claimed in claim 5, wherein a top end plate of said cylinder is bored to provide a pressure fluid supply to an upper side of said piston, while a bottom end plate is provided with one or more holes to connect the annulus side of said piston to atmosphere.
Claim 9
Dependent Claim
12 words
An extractor as claimed in claim 7, comprising a piston return spring.
Claim 10
Dependent Claim
22 words
An extractor as claimed in claim 7, wherein a three-way valve is screwed into a tapped hole in said top end plate.
Claim 11
Dependent Claim
65 words
An extractor as claimed in claim 5, wherein a tubular valve element extends between top and bottom end plates of said cylinder, said valve element being provided with bores to convey or exhaust compressed air, via bores in said top and bottom end plates, to both top side and annulus side of the piston, a valve member being slidably mounted on said tubular valve element.
Claim 12
Dependent Claim
36 words
An extractor as claimed in claim 10, wherein said valve member is maintained in a neutral position, where it does not connect compressed air to any port, by being located between a pair of compression springs.
Claim 13
Dependent Claim
36 words
An extractor as claimed in claim 1, comprising two piston and cylinder devices, the first device being to effect a nail head gripping action and the second device being to effect extraction of a gripped nail.
Claim 14
Dependent Claim
39 words
A nail extractor as claimed in claim 12, wherein said first device has its cylinder terminating in a top end plate and in a lower guide having inwardly directed guide surfaces to co-operate with peripheries of said gripping jaws.
Claim 15
Dependent Claim
25 words
An extractor as claimed in claim 13, wherein said gripping jaws are loosely located within said lower guide and urged apart by a compression spring.
Claim 16
Dependent Claim
61 words
An extractor as claimed in claim 13, wherein said lower guide also carries a bush with an aperture co-axial with the longitudinal axis of said cylinder, a rod located in said aperture, said rod terminating at its upper end in a percussion cap and at its lower end in a foot in contact with, and common to, both said gripping jaws.
Claim 17
Dependent Claim
37 words
An extractor as claimed in claim 12, wherein the said cylinder of said first device is provided with a free piston urged away from said gripping jaws by a compression spring, said piston having a striking surface.
Claim 18
Dependent Claim
55 words
An extractor as claimed in claim 12, wherein said cylinder of said second piston and cylinder device is provided with a piston and a piston rod projecting beyond said cylinder and terminating in a pusher foot, a compression spring surrounding said piston rod and extending between said piston and an abutment surface of said cylinder.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |