US4033471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift truck
Assignee: Individual
•
Filing: 1976-06-16
•
Granted: 1977-07-05
•
Expires: 1996-06-16
Abstract
Abstract The mast of a lift truck has upper and lower pinions cooperating with upper and lower racks respectively. The upper pinion has more teeth than the lower pinion for causing the mast to tilt and thereby compensate for the deflection effect of the load on the lifting arms.
Inventors
- 👤 D. T. Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:31
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/08; B66F9/10; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18088
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
144 words
A lift truck comprising a truck body supported by wheels, a mast having vertically movable lift arms thereon, said mast being supported on a front end of said body for transverse movement across said front end, upper and lower racks on said body, an upright shaft rotatably supported by said mast, an upper pinion on said shaft in mesh with said upper rack, a lower pinion on said shaft in mesh with said lower rack, said shaft interconnecting said pinions for causing said pinions to rotate through the same degree of rotation, said upper pinion having more teeth than the lower pinion, and said pinions having the same diametral pitch, whereby said post is vertically disposed when on the center line of said truck body and is tilted with respect to the vertical when disposed to one side of said truck body center line.
Claim 2
Dependent Claim
144 words
A lift truck comprising a truck body supported by wheels, a mast having vertically movable lift arms thereon, said mast being supported on a front end of said body for transverse movement across said front end, upper and lower racks on said body, an upright shaft rotatably supported by said mast, an upper pinion on said shaft in mesh with said upper rack, a lower pinion on said shaft in mesh with said lower rack, said shaft interconnecting said pinions for causing said pinions to rotate through the same degree of rotation, said upper pinion having more teeth than the lower pinion, and said pinions having the same diametral pitch, whereby said post is vertically disposed when on the center line of said truck body and is tilted with respect to the vertical when disposed to one side of said truck body center line.
Claim 3
Dependent Claim
129 words
A lift truck comprising a truck body supported by wheels, a mast having a vertically movable lift arm thereon, said mast being supported on a front end of said body for transverse movement across said front end, upper and lower sets of racks and pinions associated with said mast and body for causing the upper end of said mast to move through a greater distance than the lower end of said mast when said mast is moved transversely from the center line of said truck body, an upright portion of said mast interconnecting said pinions for causing said pinions to rotate through the same degree of rotation, whereby said mast tilts with respect to the vertical when said mast is remote from the center line of said truck body.
Claim 4
Dependent Claim
129 words
A lift truck comprising a truck body supported by wheels, a mast having a vertically movable lift arm thereon, said mast being supported on a front end of said body for transverse movement across said front end, upper and lower sets of racks and pinions associated with said mast and body for causing the upper end of said mast to move through a greater distance than the lower end of said mast when said mast is moved transversely from the center line of said truck body, an upright portion of said mast interconnecting said pinions for causing said pinions to rotate through the same degree of rotation, whereby said mast tilts with respect to the vertical when said mast is remote from the center line of said truck body.
Claim 5
Dependent Claim
20 words
A lift truck in accordance with claim 2 wherein the maximum angular tilt with respect to the vertical is 3°.
Claim 6
Dependent Claim
72 words
A lift truck in accordance with claim 2 wherein said rack and pinion means includes an upright shaft on said mast, an upper pinion connected to the upper end of said shaft and meshing with the upper rack, a lower pinion on said shaft and meshing with a lower rack, said upper pinion having more teeth than said lower pinion, said racks being identical, and said pinions having the same diametral pitch.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |