US3805646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain wrench
Assignee: Individual
•
Filing: 1972-11-14
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Granted: 1974-04-23
•
Expires: 1992-11-14
Abstract
Abstract A chain wrench has an elongated handle which is connected to a jaw member through an eccentric. Rotational movement of the handle member relative to the jaw causes rotation of the eccentric and tightening of the chain around a pipe, tube, or similar article. Movement of the eccentric over its center position causes the wrench to be locked in position about the pipe. The degree of eccentricity of the eccentric is adjustable to vary the tightness of the chain around the pipe.
Inventors
- 👤 J Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:38
CPC Classifications
B; B25; B25B; B25B13/00; B25B13/48; B25B13/50; B25B13/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
267 words
A wrench for use with pipes or similar articles, said wrench comprising an elongated cylindrical handle member, a jaw member, means on said jaw member for engaging a workpiece, a coupling member for operatively connecting said jaw member to said handle member, said coupling member having a first cylindrical portion disposed with its axial generally normal to the major extent of said handle member, bearing means on said jaw members cooperating with said first cylindrical portion whereby said jaw member and coupling member are rotationally mounted relative to each other, said coupling member further having a second cylindrical portion disposed with its axis generally parallel to the major extent of said handle member, said coupling member and said handle member being rotationally mounted relative to each other about the axis of said second cylindrical portion, a chain-like member, link means secured to one end of said chain-like member, retaining means on said jaw member for retaining a portion of said chainlike member displaced from said one end, pin means eccentrically mounted within said first cylindrical portion of said coupling member, said pin means operatively connecting said link means to said handle member, whereby arcuate movement of said handle member relative to said jaw member causes movement of said chainlike member relative to saId jaw member, and adjustment means connecting said pin means to said handle member for altering the degree of eccentricity of said pin means relative to said first cylindrical portion of said coupling member, said ajustment means being effected by rotation of said handle member relative to said second cylindrical portion of the coupling member.
Claim 2
Dependent Claim
267 words
A wrench for use with pipes or similar articles, said wrench comprising an elongated cylindrical handle member, a jaw member, means on said jaw member for engaging a workpiece, a coupling member for operatively connecting said jaw member to said handle member, said coupling member having a first cylindrical portion disposed with its axial generally normal to the major extent of said handle member, bearing means on said jaw members cooperating with said first cylindrical portion whereby said jaw member and coupling member are rotationally mounted relative to each other, said coupling member further having a second cylindrical portion disposed with its axis generally parallel to the major extent of said handle member, said coupling member and said handle member being rotationally mounted relative to each other about the axis of said second cylindrical portion, a chain-like member, link means secured to one end of said chain-like member, retaining means on said jaw member for retaining a portion of said chainlike member displaced from said one end, pin means eccentrically mounted within said first cylindrical portion of said coupling member, said pin means operatively connecting said link means to said handle member, whereby arcuate movement of said handle member relative to said jaw member causes movement of said chainlike member relative to saId jaw member, and adjustment means connecting said pin means to said handle member for altering the degree of eccentricity of said pin means relative to said first cylindrical portion of said coupling member, said ajustment means being effected by rotation of said handle member relative to said second cylindrical portion of the coupling member.
Claim 3
Dependent Claim
34 words
A wrench as set forth in claim 1 whereby said eccentrically mounted pin means is movable to an over-center position to thereby retard movement of said wrench from an operative to an inoperative position.
Claim 4
Dependent Claim
27 words
A wrench as set forth in claim 2 further comprising abutment means on said coupling member engagable with said jaw member for limiting relative rotational movement therebetween.
Claim 5
Dependent Claim
61 words
A wrench as set forth in claim 1 wherein said adjustment means comprises an elongated rod member having one end connected to said pin means and having a second end which is threadably connected to said handle member whereby rotational movement of said handle member about its longitudinal axis causes relative axial movement between said rod member and said handle member.
Claim 6
Dependent Claim
30 words
A wrench as set forth in claim 4 wherein said workpiece engaging means comprises a pair of gripping members securkd to said jaw member and having a serrated surface thereon.
Claim 7
Dependent Claim
33 words
A wrench as set forth in claim 1 wherein said first cylindrical portion has a peripheral opening provided in the central portion thereof and wherein said link means extends through said peripheral opening.
Claim 8
Dependent Claim
44 words
A wrench as set forth in claim 1 wherein said first cylindrical portion is provided with end caps having radial slots therein and wherein said pin means extends through said slots, said adjustment means causing said pin means to move along said radial slot.
Claim 9
Dependent Claim
26 words
A wrench as set forth in claim 7 wherein said link means comprises a yoke member secured to said pin means externally of said end caps.
Claim 10
Dependent Claim
22 words
A wrench as set forth in claim 7 wherein said radial slots are aligned with the longitudinal axis of said handle member.
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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |