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US3568804A
Expired / Lapsed
US
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Elevating table with improved ball screw drive
Assignee: Individual
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Filing: 1968-08-14
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Granted: 1971-03-09
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Expires: 1988-08-14
Abstract
Abstract A ball screw drive and suspension system which includes, generally, a ball screw which is supported at the top by a selfaligning bearing and is supported and driven at the bottom by a drive assembly. The load, in the instant case, the roller platform of an elevating table, is supported by a ball nut through a pair of links capable of accepting misalignment between the ball screw and the load supporting mechanism, i.e., the roller platform. With this arrangement, the alignment tolerances between each vertical lift assembly are far more liberal than heretofore possible. The elevating table further includes four load cells which are functionally associated with its roller platform and an indicator mechanism, in a fashion such that articles placed on the roller platform are automatically weighed and the weight indicated.
Inventors
- 👤 Robert A Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:02
CPC Classifications
B; B66; B66F; B66F7/00; B66F7/02; B66F7/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 words
An elevating table comprising, in combination: a base frame having a plurality of spaced-apart, vertically disposed cornerposts fixedly secured to it, a ball screw drive including a ball screw and a ball nut retained within each of said cornerposts, each of said ball nuts having collar means affixed to them, said collar means each having pin means fixedly secured thereto in diametrically opposed positions, a platformlike load support, a plurality of link means flexibly coupling said load support to said ball nuts, said link means each comprising an elongated barlike member having an aperture adjacent one end thereof, an apertured bushing having a resilient sleeve about its exterior peripheral surface retained within said aperture and adapted to receive one of said pin means therein, the opposite end of said barlike member being secured to said load support, whereby misalignment due either to construction tolerance or deflections of said load support with respect to said cornerposts are compensated for so that substantial horizontal force components are not exerted directly upon said ball nuts and said ball screws, and drive means coupled to and operable to drive said ball screw drives to raise and lower said load support.
Claim 2
Dependent Claim
196 words
An elevating table comprising, in combination: a base frame having a plurality of spaced-apart, vertically disposed cornerposts fixedly secured to it, a ball screw drive including a ball screw and a ball nut retained within each of said cornerposts, each of said ball nuts having collar means affixed to them, said collar means each having pin means fixedly secured thereto in diametrically opposed positions, a platformlike load support, a plurality of link means flexibly coupling said load support to said ball nuts, said link means each comprising an elongated barlike member having an aperture adjacent one end thereof, an apertured bushing having a resilient sleeve about its exterior peripheral surface retained within said aperture and adapted to receive one of said pin means therein, the opposite end of said barlike member being secured to said load support, whereby misalignment due either to construction tolerance or deflections of said load support with respect to said cornerposts are compensated for so that substantial horizontal force components are not exerted directly upon said ball nuts and said ball screws, and drive means coupled to and operable to drive said ball screw drives to raise and lower said load support.
Claim 3
Dependent Claim
68 words
The elevating table of claim 1, further including a weighing mechanism, and wherein said load support comprises a platform support and a platform supported atop said platform support in spaced relation to it by means of a plurality of load cells, said load cells being adapted to couple electrical signals to said weighing mechanism to operate the latter to indicate the weight of objects placed on said platform.
Claim 4
Dependent Claim
80 words
The elevating table of claim 1, wherein said load support has pairs of arms corresponding in number to the number of ball screw drives, each of the arms of said pair of arms being spaced apart to receive said collar means therebetween in a fashion such that one of said pin means can be affixed to each of said arms, said arms having guide means affixed to them for aligning and guiding said load support with respect to said cornerposts.
References Cited (Backward Citations)
US3082607A
Cited
US3474925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |