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US4487396A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scotch block attachment fitting
Assignee: Individual
•
Filing: 1983-09-14
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Granted: 1984-12-11
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Expires: 2003-09-14
Abstract
Abstract A wrecker for towing disabled automobiles and the like has attachment fittings on the rear bumper each for securing a scotch block chain and a snatch block to the bumper at the same location on the bumper. When an automobile is being winched into towing position, buckling forces exerted on the bumper by tension developed in the scotch block chains are counterbalanced by forces exerted on the bumper by tension developed in the winching cable which is passed around pulleys on the snatch blocks.
Inventors
- 👤 Frederick M. Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:13
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/12; Y; Y10; Y10T; Y10T24/00; Y10T24/45; Y10T24/45225; Y10T24/45602; Y10T24/45723; Y10T24/45743; Y10T24/45754; Y10T24/45984
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
152 words
A wrecker for towing a load such as a broken-down automobile and the like, the wrecker including winching means for winching an automobile into towing position at the rear of the wrecker, first securement means associated with the rear bumper of the wrecker for releasably attaching a left-hand scotch block chain and a left-hand snatch block and pulley for a towing cable to the bumper at a first common location on the bumper, and second securement means associated with the rear bumper of the wrecker for releasably attaching a right-hand scotch block chain and a right-hand snatch block and pulley for the towing cable to the bumper at a second common location on the bumper, whereby when winching a load to towing position, forces exerted on the bumper due to tension developed in the scotch block chains are substantially counterbalanced by forces exerted on the bumper by tension developed in the cable.
Claim 2
Dependent Claim
152 words
A wrecker for towing a load such as a broken-down automobile and the like, the wrecker including winching means for winching an automobile into towing position at the rear of the wrecker, first securement means associated with the rear bumper of the wrecker for releasably attaching a left-hand scotch block chain and a left-hand snatch block and pulley for a towing cable to the bumper at a first common location on the bumper, and second securement means associated with the rear bumper of the wrecker for releasably attaching a right-hand scotch block chain and a right-hand snatch block and pulley for the towing cable to the bumper at a second common location on the bumper, whereby when winching a load to towing position, forces exerted on the bumper due to tension developed in the scotch block chains are substantially counterbalanced by forces exerted on the bumper by tension developed in the cable.
Claim 3
Dependent Claim
68 words
The invention of claim 1 wherein the first and second securement means each comprises means defining a keyhole opening for securing a respective scotch block chain, and a pivotal U-shaped link mounted adjacent the keyhole opening for attachment of a respective snatch block, the positioning of the keyhole opening and link being such that the scotch block chain when secured in the keyhole opening passes through the link.
Claim 4
Dependent Claim
63 words
The invention of claim 2 wherein the first and second securement means each comprises a box fitting attached to the inside of the bumper around a cut-out in the bumper, the keyhole opening being formed in a rear wall of a box fitting and the link being pivotally mounted between opposite sidewalls of the fitting and being receivable therein when not in use.
Claim 5
Dependent Claim
48 words
The invention of claim 1 wherein the first and second securement means each comprises a plate projecting from the bumper of the wrecker, and means defining a keyhole opening in the plate for attachment both of one of the scotch block chains and one of the snatch blocks.
Claim 6
Dependent Claim
139 words
A wrecker for towing a load, such as a broken-down automobile or the like, the wrecker comprising winching means including a winching cable for winching an automobile into towing position at the rear of the wrecker, left- and right-hand securing means associated with a rear bumper of the wrecker for attaching left- and right-hand scotch block chains to the bumper, and means for counterbalancing forces exerted on the bumper by tension developed in the scotch block chains during winching, the counterbalancing means comprising left- and right-hand snatch blocks and pulleys through which the winching cable is passed, and left- and right-hand attachment means for securing the respective snatch blocks and pulleys to the bumper at locations wherein tension developed in the cable during winching produces forces on the bumper counteracting the forces exerted thereon by the scotch block chains.
Claim 7
Dependent Claim
139 words
A wrecker for towing a load, such as a broken-down automobile or the like, the wrecker comprising winching means including a winching cable for winching an automobile into towing position at the rear of the wrecker, left- and right-hand securing means associated with a rear bumper of the wrecker for attaching left- and right-hand scotch block chains to the bumper, and means for counterbalancing forces exerted on the bumper by tension developed in the scotch block chains during winching, the counterbalancing means comprising left- and right-hand snatch blocks and pulleys through which the winching cable is passed, and left- and right-hand attachment means for securing the respective snatch blocks and pulleys to the bumper at locations wherein tension developed in the cable during winching produces forces on the bumper counteracting the forces exerted thereon by the scotch block chains.
Claim 8
Dependent Claim
67 words
The invention of claim 5 wherein the winching means includes an elevated boom from which the winching cable extends downwardly to the respective snatch block pulleys, said locations being the same locations at which the scotch block chains are attached and being toward the bottom of the bumper so as to minimize a moment arm tending to tip the wrecker up about the rear wheels during winching.
Claim 9
Dependent Claim
51 words
The invention of claim 5 wherein the left-hand securing means and attachment means and the right-hand securing means and attachment means are each integrated into a single fitting secured to the bumper and comprising a keyhole opening defining the respective securing means and a pivoted link defining the respective attachment means.
Claim 10
Dependent Claim
49 words
The invention of claim 7 wherein the left-hand securing means and attachment means, and the right-hand securing means and attachment means are integrated in respective fittings secured to the bumper and each comprising a projecting plate with a keyhole opening defining both the respective securing means and attachment means.
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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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |