US3628844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage cabinet with revolving shelves
Assignee: Amerock Corp
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Filing: 1970-02-09
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Granted: 1971-12-21
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Expires: 1990-02-09
Abstract
Abstract Mounted within a square storage cabinet is a tier of revolving shelves each shaped generally as a three-quarters circle having a diameter approximately equal to the square dimension of the cabinet to avoid wasted space in the cabinet. Each shelf is formed with one straight edge located to enable tiers of trays attached to two swinging cabinet doors to be made of an optimum depth permitting the trays to fill the space between the shelves and the doors when the latter are closed. Detent mechanisms hold the shelves in centered positions within the cabinet and resist any tendency of the shelves to spin uncontrollably when turned out of the centered positions. The door trays are hooked detachably onto standards fastened to the inner sides of the doors and are constructed to avoid leaving objectionable gaps between the doors and the trays.
Inventors
- 👤 Bruce A Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:47
CPC Classifications
A; A47; A47B; A47B49/00; A47B49/004
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
370 words
In a revolving shelf assembly adapted for mounting within a cabinet, the combination of, an upright post, a tier of vertically spaced and horizontally disPosed shelves each mounted for rotation and for up and down sliding on said post, a supporting hub fastened to the underside of each shelf and rotatably and slidably telescoped over said post, a cam telescoped over and fastened rigidly to said post beneath each of said supporting hubs with each supporting hub resting on its underlying cam, coacting cam surfaces formed on the lower side of each supporting hub and the upper side of each cam and engageable with one another to retain said shelf releasably in a predetermined angular position relative to said post, said cam surfaces being shaped to cause said shelf to slide upwardly on said post in response to the shelf being positively rotated from said predetermined position and thereafter bearing frictionally against one another, each of said coacting cam surfaces including a lower dwell portion extending around an arc of predetermined length, two rise portions inclined upwardly from the ends of said lower dwell portion, and an upper dwell portion extending between the upper ends of said rise portions and around an arc of greater length than said first arc, the respective cam portions mating with one another when said shelf is in said predetermined position with said inclined portions bearing against each other to retain the shelf releasably in such position, and the lower dwell portion of the cam surface on said supporting hub frictionally engaging the upper dwell portion of the cam surface on said cam when said shelf is rotated from said predetermined position thereby to resist unduly free rotation of the shelf one side of said post being deformed inwardly to define a depression extending along the side of the post, each of said cams being formed with a centrally located hole receiving said post an inwardly extending key formed integrally with each cam adjacent said hole and projecting into said depression, and a screw threaded through each cam and bearing against the opposite side of said post to draw said key tightly into said depression and thereby lock the cam against rotation on the post.
Claim 2
Dependent Claim
370 words
In a revolving shelf assembly adapted for mounting within a cabinet, the combination of, an upright post, a tier of vertically spaced and horizontally disPosed shelves each mounted for rotation and for up and down sliding on said post, a supporting hub fastened to the underside of each shelf and rotatably and slidably telescoped over said post, a cam telescoped over and fastened rigidly to said post beneath each of said supporting hubs with each supporting hub resting on its underlying cam, coacting cam surfaces formed on the lower side of each supporting hub and the upper side of each cam and engageable with one another to retain said shelf releasably in a predetermined angular position relative to said post, said cam surfaces being shaped to cause said shelf to slide upwardly on said post in response to the shelf being positively rotated from said predetermined position and thereafter bearing frictionally against one another, each of said coacting cam surfaces including a lower dwell portion extending around an arc of predetermined length, two rise portions inclined upwardly from the ends of said lower dwell portion, and an upper dwell portion extending between the upper ends of said rise portions and around an arc of greater length than said first arc, the respective cam portions mating with one another when said shelf is in said predetermined position with said inclined portions bearing against each other to retain the shelf releasably in such position, and the lower dwell portion of the cam surface on said supporting hub frictionally engaging the upper dwell portion of the cam surface on said cam when said shelf is rotated from said predetermined position thereby to resist unduly free rotation of the shelf one side of said post being deformed inwardly to define a depression extending along the side of the post, each of said cams being formed with a centrally located hole receiving said post an inwardly extending key formed integrally with each cam adjacent said hole and projecting into said depression, and a screw threaded through each cam and bearing against the opposite side of said post to draw said key tightly into said depression and thereby lock the cam against rotation on the post.
Claim 3
Dependent Claim
54 words
A revolving shelf assembly as defined in claim 1 in which each cam includes a cylindrical bushing formed integrally with and projecting upwardly from said cam surface on said cam, said bushing being telescoped over said post and into one of said supporting hubs to mount the latter rotatably and slidably on the post.
Claim 4
Dependent Claim
91 words
A shelf assembly as defined in claim 1 in which each of said cams comprises an inner supporting disc fastened to said post and an outer sleeve made of plastic material telescoped over said disc and defining the cam surface on said cam, said sleeve including a cylindrical bushing formed integrally with and projecting upwardly from said rise portions and said upper and lower dwell portions, and said bushing being telescoped over said post and into one of said supporting hubs to mount the latter rotatably and slidably on the post.
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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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |