US4776552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Book rest
Assignee: THOMSON-LEEDS Co 111 5TH AVE NEW YORK NY A CORP OF NY
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Filing: 1987-10-16
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Granted: 1988-10-11
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Expires: 2007-10-16
Abstract
Abstract A collapsible book rest includes a first panel having a transversely medially located rectangular opening and divided into similar side sections by a medially longitudinally extending self hinge, a rectangular second panel self hinged to the rear edge of the opening and divided into side by side and end to end sections by a transverse self hinge and a medial longitudinal self hinge colinear with the first panel longitudinal hinge. Follower slides project transversely from the front corners of the second panel and slidably engage tracks along the opening side edges and separably engage detents along the track to releasably lock the first panel sections in coplanar positions and the second panel in a depending dihedral defining position.
Inventors
- 👤 David March
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:25
CPC Classifications
A; A47; A47B; A47B23/00; A47B23/04; A47B23/042; A47B23/043; A47B23/044
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
197 words
A collapsible book rest comprising a first panel having an opening formed therein and divided into side by side sections by a longitudinally extending first hinge, said sections being swingable about said first hinge between an open coplanar position and a closed overlapping position, a second panel of no greater dimensions than said opening and joined along its rear edge to the rear edge of said opening by a second hinge and divided into side by side sections by a third hinge colinear with said first hinge and subdivided into longitudinal end to end sections by a transverse fourth hinge, said second panel sections being swingable about said second, third and fourth hinges between an advanced position with said second panel forming a dihedral angle about said fourth hinge and depending from said first panel and a retracted position registering with said opening, said retracted second panel being foldable about said third hinge to a closed position with the side by side sections thereof overlapping with the closing of said first panel and means for releasably retaining said book rest in an erected position with said first panel open and said second panel in its advanced position.
Claim 2
Dependent Claim
197 words
A collapsible book rest comprising a first panel having an opening formed therein and divided into side by side sections by a longitudinally extending first hinge, said sections being swingable about said first hinge between an open coplanar position and a closed overlapping position, a second panel of no greater dimensions than said opening and joined along its rear edge to the rear edge of said opening by a second hinge and divided into side by side sections by a third hinge colinear with said first hinge and subdivided into longitudinal end to end sections by a transverse fourth hinge, said second panel sections being swingable about said second, third and fourth hinges between an advanced position with said second panel forming a dihedral angle about said fourth hinge and depending from said first panel and a retracted position registering with said opening, said retracted second panel being foldable about said third hinge to a closed position with the side by side sections thereof overlapping with the closing of said first panel and means for releasably retaining said book rest in an erected position with said first panel open and said second panel in its advanced position.
Claim 3
Dependent Claim
36 words
The book rest of claim 1 wherein the side edges of said opening are parallel and longitudinal and including guide means longitudinally slidably coupling the front edge of said second panel to said opening side edges.
Claim 4
Dependent Claim
40 words
The book rest of claim 2 wherein said guide means includes tracks extending along the forward portions of said opening side edges and follower slides projecting transversely from the front corners of said second panel and slidably embracing said tracks.
Claim 5
Dependent Claim
33 words
The book rest of claim 3 including transversely extending strips hinged to the front edges of said second panel front section front edges and terminating at their outer ends in said follower slides.
Claim 6
Dependent Claim
38 words
The book rest of claim 3 wherein said retaining means comprises a detent located on each of said tracks proximate its rear end and each of said followers has a recess formed therein releasably engaging a respective detent.
Claim 7
Dependent Claim
41 words
The book rest of claim 3 wherein each of said tracks terminates at its front end short of the front edge of said opening, said follower slides in the retracted position of said second panel being disposed forwardly of said tracks.
Claim 8
Dependent Claim
23 words
The book rest of claim 3 wherein said tracks are below the level of the top faces of said front panel side sections.
Claim 9
Dependent Claim
20 words
The book rest of claim 1 including upwardly directed flanges formed along the front edges of said first panel sections.
Claim 10
Dependent Claim
20 words
The book rest of claim 1 wherein said first panel opening and said second panel are of similar rectangular configuration.
Claim 11
Dependent Claim
24 words
The book rest of claim 1 formed as an integral unit with each of said first, second, third and fourth hinges being self hinges.
Claim 12
Dependent Claim
40 words
The book rest of claim 1 wherein in the erected position of said book rest said second panel rear sections are at an acute angle to the plane of said forth hinge and the front edge of said first panel.
Claim 13
Dependent Claim
101 words
A collapsible book rest comprising a book supporting platform member having an opening formed therein and divided by a medial longitudinally extending self hinge into opposite side panels swingable about said self hinge between an open position wherein said sections are coplanar and a closed position wherein said sections overlap, a prop member connected by a self hinge to the rear edge of said opening and swingable between an advanced position depending from said platform and a retracted position registering with said opening and locking means releasably retaining said platform member and prop member in their open and advanced positions respectively.
Claim 14
Dependent Claim
101 words
A collapsible book rest comprising a book supporting platform member having an opening formed therein and divided by a medial longitudinally extending self hinge into opposite side panels swingable about said self hinge between an open position wherein said sections are coplanar and a closed position wherein said sections overlap, a prop member connected by a self hinge to the rear edge of said opening and swingable between an advanced position depending from said platform and a retracted position registering with said opening and locking means releasably retaining said platform member and prop member in their open and advanced positions respectively.
Claim 15
Dependent Claim
81 words
The book rest of claim 12 wherein said platform member comprises a panel divided by said medial self hinge into similarly shaped side sections, said opening is of rectangular configuration and transversely medially located in said panel and said prop member is of rectangular configuration and joined to said opening rear edge by a transverse self hinge and divided into end to end and side by side section by a longitudinally extending medial self hinge and a transversely extending self hinge.
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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) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |