Patent US3654879A successfully refreshed from Google Patents.
US3654879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twist cam lock for knockdown shelving
Assignee: Hirsh Co
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Filing: 1970-04-16
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Granted: 1972-04-11
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Expires: 1990-04-16
Abstract
Abstract Knockdown steel shelving is disclosed wherein each corner of a shelf is provided with a slidably mounted hook member that extends into the cut-out corner of the shelf. The hook members are guided within the box flange for retraction to clear an upright support member for level adjustment and for extension to a position for engagement within an opening in an upright support member and then tightened to a retracted position by a cam whereby the shelf corner and support are brought into rigid, weight-supporting relationship. The cam operates within a slot in the hook member and can have one of several locked positions including a position wherein the cam is rotated so that the lobe retracts the hook member into a locked position with a bottom edge of the hook member against the bottom wall of the box flange or with a top edge of the hook member against the top wall of the box flange. In either position, the cam may lock at a side-deadcenter position in relation to the other parts. The hook attaching means and cam are essentially concealed, easily installed and adapted for use with various designs of shelves and corner supports. Other embodiments are disclosed.
Inventors
- 👤 Irwin J Ferdinand
- 👤 Irwin R Kulbersh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:40
CPC Classifications
A; A47; A47B; A47B57/00; A47B57/30; A47B57/40; A47B57/402; F; F16; F16B; F16B7/00; F16B7/04; F16B7/044; F16B7/0446; F16B7/0453; F16B7/046
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
348 words
In a knockdown shelving construction comprising an upright support member having an aperture through a wall portion thereof; a shelf having a horizontal portion and a depending box flange member having spaced vertical side walls and transverse top and bottom walls terminally abutting said wall portion at one end of said flange with horizontal coaxial apertures in said side walls of said box flange spaced from said abutting end; a fastening device interconnecting said shelf and support members including a cam member having axially spaced circular portions rotatably journaled in said coaxial apertures in said side walls and an eccentric camming portion intermediate said circular portions between said side walls; a hook means having a generally flat body portion in spaced relation within the walls of said box flange and having an elongated slot extending longitudinally thereof; said hook means having portions of its top and bottom edges normally spaced from the transverse walls of said box flange in the unlocked position; a bottom opening slot defining a hook member at one end of said flat body portion; said hook member having an inwardly facing flat edge portion and being receivable through said aperture; the elongated slot of said hook means being pivotally engaged upon the eccentric camming portion of said cam member and having a rear edge engageable therewith to move said hook means axially of said box flange and a top edge engageable therewith to raise said hook means; said bottom opening slot receiving the lower edge of said wall portion bordering said aperture in weight supported relationship thereon; and one of said circular portions of said cam member having a tool engageable contour for rotating said cam member whereby said eccentric camming portion reciprocates said hook means from said unlocked position to a locked position wherein said flat edge of said hook member engages said wall portion below said aperture and pivots to draw said flange endwise tightly in abutting relationship against said support member in a locked position with an edge of said hook means wedged against a transverse wall of said box flange.
Claim 2
Dependent Claim
348 words
In a knockdown shelving construction comprising an upright support member having an aperture through a wall portion thereof; a shelf having a horizontal portion and a depending box flange member having spaced vertical side walls and transverse top and bottom walls terminally abutting said wall portion at one end of said flange with horizontal coaxial apertures in said side walls of said box flange spaced from said abutting end; a fastening device interconnecting said shelf and support members including a cam member having axially spaced circular portions rotatably journaled in said coaxial apertures in said side walls and an eccentric camming portion intermediate said circular portions between said side walls; a hook means having a generally flat body portion in spaced relation within the walls of said box flange and having an elongated slot extending longitudinally thereof; said hook means having portions of its top and bottom edges normally spaced from the transverse walls of said box flange in the unlocked position; a bottom opening slot defining a hook member at one end of said flat body portion; said hook member having an inwardly facing flat edge portion and being receivable through said aperture; the elongated slot of said hook means being pivotally engaged upon the eccentric camming portion of said cam member and having a rear edge engageable therewith to move said hook means axially of said box flange and a top edge engageable therewith to raise said hook means; said bottom opening slot receiving the lower edge of said wall portion bordering said aperture in weight supported relationship thereon; and one of said circular portions of said cam member having a tool engageable contour for rotating said cam member whereby said eccentric camming portion reciprocates said hook means from said unlocked position to a locked position wherein said flat edge of said hook member engages said wall portion below said aperture and pivots to draw said flange endwise tightly in abutting relationship against said support member in a locked position with an edge of said hook means wedged against a transverse wall of said box flange.
Claim 3
Dependent Claim
70 words
The combination called for in claim 1 in which: said rear edge of said slot in said hook means is a curved edge engaged by said camming portion and the locked position of said cam member occurs with said camming portion mated within said curved edge, and said hook means is raised with its top edge contiguous with the top transverse wall of said box flange in the locked position.
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |