Patent US3880024A successfully refreshed from Google Patents.
US3880024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable power wrench
Assignee: Tokai Tekkosha KK
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Filing: 1974-01-09
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Granted: 1975-04-29
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Expires: 1994-01-09
Abstract
Abstract A portable power wrench consisting of a first and a second pipe holder, and a hydraulic cylinder for turning the two holder relative to each other. The first holder holds a first pipe and swingably holds the hydraulic cylinder. The second holder is swingably connected to a piston rod of the cylinder and holds a second pipe threadedly engaging the first pipe in such a manner that, upon forward actuation of the hydraulic cylinder, the second pipe is turned, but when the piston rod is moved reversely, the second holder slides on the second pipe without turning the latter.
Inventors
- 👤 Suekichi Asada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:24
CPC Classifications
B; B25; B25B; B25B13/00; B25B13/48; B25B13/50; B25B13/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
226 words
A portable power wrench, comprising a first holding means including a body having a head portion and vice holders integrally formed with the head portion, vice pieces detachably secured to the vice holdErs to substantially immovably hold a first pipe member relative to the body, said head portion being provided with a hole, a stud secured in said hole, a shaft received by said stud, said first pipe member being held by said holding means in such a manner that the longitudinal axial center line of the first pipe member extends parallel to said shaft, a hydraulic cylinder slidably mounted on said shaft and swingable about said shaft, said hydraulic cylinder having a piston rod which is reciprocably movable in a plane perpendicular to said shaft; and a second holding means including a swingable bar pivotally connected to said piston rod at one end thereof, a serration formed at the opposite end of the swingable bar along an arc whose center of curvature is offset from said end of the swingable bar connected to the piston rod, and means for holding a second pipe member while causing said serration to engage the peripheral surface of the second pipe member, said second pipe member being axially aligned with said first pipe member when the two pipe members are held by said first and second holding means, respectively.
Claim 2
Dependent Claim
226 words
A portable power wrench, comprising a first holding means including a body having a head portion and vice holders integrally formed with the head portion, vice pieces detachably secured to the vice holdErs to substantially immovably hold a first pipe member relative to the body, said head portion being provided with a hole, a stud secured in said hole, a shaft received by said stud, said first pipe member being held by said holding means in such a manner that the longitudinal axial center line of the first pipe member extends parallel to said shaft, a hydraulic cylinder slidably mounted on said shaft and swingable about said shaft, said hydraulic cylinder having a piston rod which is reciprocably movable in a plane perpendicular to said shaft; and a second holding means including a swingable bar pivotally connected to said piston rod at one end thereof, a serration formed at the opposite end of the swingable bar along an arc whose center of curvature is offset from said end of the swingable bar connected to the piston rod, and means for holding a second pipe member while causing said serration to engage the peripheral surface of the second pipe member, said second pipe member being axially aligned with said first pipe member when the two pipe members are held by said first and second holding means, respectively.
Claim 3
Dependent Claim
144 words
A wrench according to claim 1, wherein said first holding means further includes a chain cooperating with said vice holders, and said body has a chain-end-receiving hole bored at one end of the vice holders and a hook formed at the opposite end of the vice holders, said chain having an end member with a least one planar surface which end member is fitted in said chain-end-receiving hole of the body, said chain-end-receiving hole having at least one planar surface engageable with said planar surface of the end member, said body having a chain end holding means holding said chain end member in said chain-end-receiving hole and a spring inserted between the chain end member and said chain end holding means, said chain including a plurality of chain pins each of which is adapted to be selectively engaged with said hook of the body.
Claim 4
Dependent Claim
25 words
A wrench according to claim 1 wherein said piston rod of the hydraulic cylinder is pivotally connected to said swingable bar by a connector pin.
Claim 5
Dependent Claim
103 words
A wrench according claim 1, wherein said means for holding said second pipe member in said second holding means includes a chain having an end member connected to one end thereof, said swingable bar of said second holding means having a chain holding unit pivotally connected to an intermediate portion thereof, said chain holding unit adjustably holding said chain end member, said swingable bar having a hook integrally formed therewith at a position opposite to said chain holding unit, said chain having a plurality of chain pins each of which is adapted to be selectively engaged with said hook of the swingable bar.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |