US3747783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wrecker sling pin lock
Assignee: Individual
•
Filing: 1972-01-28
•
Granted: 1973-07-24
•
Expires: 1992-01-28
Abstract
Abstract A coupling pin is provided for pivotally securing the lower bracket of a tow truck sling to the tow truck frame to prevent theft, with the coupling pin having a shaft provided with one or more through diametric bores at one end for reception of a padlock and an enlarged head at the other end. To further make theft difficult by reinforcing the pin and to provide an annular abutment, a sleeve is telescoped over the padlock end of the shaft so that its opposed bores will align with the bore of the shaft for common reception of the padlock shackle.
Inventors
- 👤 W Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:07
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/12; B60P3/125; Y; Y10; Y10T; Y10T70/00; Y10T70/50; Y10T70/5611; Y10T70/5854; Y10T70/5867; Y10T70/5889; Y10T70/5982
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
237 words
A tow truck, comprising: a frame; a rearwardly extending boom with a rearward terminal end and a forward portion connected to the frame; a lifting cable with a hook at one end and mounted about the terminal end of the boom for raising and lowering the hook; a transverse rigid upper sling brace having an eye received on the hook; a lower transverse rigid sling brace; a resilient sling strap extending between the braces; a mounting bracket outwardly supporting the lower sling braCe from the tow truck frame; means including horizontally aligned apertures in the frame and bracket and a coupling pivot pin extending through said apertures for pivotally mounting the bracket on the frame; said pin having an elongated shaft within the aligned apertures of the frame and bracket; a head portion integral with one end of said shaft, outside the apertures and being laterally larger than said shaft to prevent withdrawal of the inserted shaft in one direction from the aligned apertures; at least one substantially diametric through bore in the other end of said shaft; a sleeve having an internal diameter substantially equal to the external diameter of said shaft, and further having diametrically opposed through bores complimentary to the through bore in said shaft and a security lock means having a shackle extending through said sleeve and shaft bores to prevent removal of said shaft in the other direction from the aligned apertures.
Claim 2
Dependent Claim
237 words
A tow truck, comprising: a frame; a rearwardly extending boom with a rearward terminal end and a forward portion connected to the frame; a lifting cable with a hook at one end and mounted about the terminal end of the boom for raising and lowering the hook; a transverse rigid upper sling brace having an eye received on the hook; a lower transverse rigid sling brace; a resilient sling strap extending between the braces; a mounting bracket outwardly supporting the lower sling braCe from the tow truck frame; means including horizontally aligned apertures in the frame and bracket and a coupling pivot pin extending through said apertures for pivotally mounting the bracket on the frame; said pin having an elongated shaft within the aligned apertures of the frame and bracket; a head portion integral with one end of said shaft, outside the apertures and being laterally larger than said shaft to prevent withdrawal of the inserted shaft in one direction from the aligned apertures; at least one substantially diametric through bore in the other end of said shaft; a sleeve having an internal diameter substantially equal to the external diameter of said shaft, and further having diametrically opposed through bores complimentary to the through bore in said shaft and a security lock means having a shackle extending through said sleeve and shaft bores to prevent removal of said shaft in the other direction from the aligned apertures.
Claim 3
Dependent Claim
56 words
The tow truck of claim 1, including a second through diametric bore in said shaft other end, axially spaced from said first mentioned shaft bore, for selective alignment of said sleeve bores with either of said shaft bores to change the effective axial connecting length of said shaft to accommodate different types of sling mounting brackets.
Claim 4
Dependent Claim
14 words
The tow truck of claim 1, wherein said lock is a key type padlock.
Claim 5
Dependent Claim
126 words
The tow truck of claim 1, wherein said head portion has an annular surface substantially perpendicular to said shaft, facing the other end, and engaging one of said frame and bracket; said sleeve having an annular surface engaging a corresponding surface on one of said frame and bracket; and the axial length, with respect to the axis of said shaft, between said head portion surface and said diametric through bore in the other end of said shaft being substantially equal to the axial length of the aligned apertures between said corresponding surfaces of said frame and bracket together with the axial length of said sleeve between said sleeve surface and diametrically opposed through bores so as to constitute means shielding said shaft and re-enforcing said shackle.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |