US3951286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand truck fork lift
Assignee: Individual
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Filing: 1974-09-19
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Granted: 1976-04-20
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Expires: 1994-09-19
Abstract
Abstract This invention relates to equipment utilized to cary loads, and more particularly it is a utility device covering especially improvements in hand truck fork lifts. Inventor realizes that there are already on the market a number of load lifting trucks. However, in his opinion, the marketable types of trucks are too large, too clumsy, cumbersome and complecate in their overall design for the purpose intended. What the applicant has in mind is rather a hand truck fork lift which will be easy to manufacture and to operate permitting the lifting of substantial loads without undue effort on the operator and the development of a torque on the lifting mechanism. One disadvantage of trucks of similar nature already available is the fact that when the load is lifted on a platform, and when the load suddenly shifts, the truck lifting mechanism is unable to balance the load on the platform and the load may drop off the truck and become damaged. Accordingly, one of the main objects on the present invention is to provide a lifting platform which will maintain its own balance at all loads, even though the load has a tendency to shift during the lifting operation.
Inventors
- 👤 Ray J. Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:47
CPC Classifications
B; B62; B62B; B62B1/00; B62B1/10; B62B1/14; B62B2203/00; B62B2203/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
295 words
In a device of the class described, comprising a hand truck fork lift, said device having a rectangular iron frame including a pair of upright supports in parallel spaced apart relation and enjoined by a plurality of transverse cross pieces or spacers, a platform having a plurality of rollers riding along said upright supports, and mechanical means to raise or lower said platform along said frame including a pair of cables, each of which are secured at their one ends to studs mounted on said platform, while the other ends of said cables are fastened to a common winding drum, both said cables having an intermediate portion thereof passed around a pair of pulley-like rollers rotatable about a common horizontal shaft supported at an upper end of said frame, said studs being spaced apart a distance that is several times greater than a distance between said pulley-like rollers, whereby said cables are convergingly inclined from said studs to said pulley-like rollers, the incline of said cables being greatest when said platform is highest elevated, means to wind or unwind said cables on said drum, said cable winding means including a housing in which there is a drum riding upon an idler shaft and a large spur gear, said gear made fast to said drum, and rotating with said drum on said idler shaft, a secondary stud gear meshing with said large gear, said stud gear held to an operating shaft, said shaft running parallel with the shaft on which the drum and the large gear are mounted, and a handle one said secondary shaft, the operation of said handle rotating said stud gear and said large gear, respectably, to wind said pair of cables on said drum to raise or to lower the aforesaid platform.
Claim 2
Dependent Claim
295 words
In a device of the class described, comprising a hand truck fork lift, said device having a rectangular iron frame including a pair of upright supports in parallel spaced apart relation and enjoined by a plurality of transverse cross pieces or spacers, a platform having a plurality of rollers riding along said upright supports, and mechanical means to raise or lower said platform along said frame including a pair of cables, each of which are secured at their one ends to studs mounted on said platform, while the other ends of said cables are fastened to a common winding drum, both said cables having an intermediate portion thereof passed around a pair of pulley-like rollers rotatable about a common horizontal shaft supported at an upper end of said frame, said studs being spaced apart a distance that is several times greater than a distance between said pulley-like rollers, whereby said cables are convergingly inclined from said studs to said pulley-like rollers, the incline of said cables being greatest when said platform is highest elevated, means to wind or unwind said cables on said drum, said cable winding means including a housing in which there is a drum riding upon an idler shaft and a large spur gear, said gear made fast to said drum, and rotating with said drum on said idler shaft, a secondary stud gear meshing with said large gear, said stud gear held to an operating shaft, said shaft running parallel with the shaft on which the drum and the large gear are mounted, and a handle one said secondary shaft, the operation of said handle rotating said stud gear and said large gear, respectably, to wind said pair of cables on said drum to raise or to lower the aforesaid platform.
Claim 3
Dependent Claim
91 words
The combination according to claim 1; and a pin provided to restrict the operation of said handle, said handle having an opening, with said cast-iron housing have another opening, being in alignment with the opening in said handle, said pin being inserted into the opening in the handle and made fast in the opening in the cast-iron housing for the purpose of disconnecting the operation of winding said cables, the removal of said pin from said openings in said handle and in said housing making the winding drum again operatively effective.
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) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |