US3837298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Levelling assembly for warpable playing surfaces
Assignee: Individual
•
Filing: 1973-07-23
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Granted: 1974-09-24
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Expires: 1993-07-23
Abstract
Abstract A rigid T-shaped rail connected along the longitudinal center axis on the bottom of a playing surface panel has pairs of depending lugs on opposite sides and at opposite ends thereof. Bracket members are connected to the under surface of the panel laterally outwardly from the lugs on the rail, which brackets provide a vertically narrow lost-motion slot adjacent the bottom surface of the panel. An adjustable triangle mechanism is connected between the depending lugs and a slide member in the vertically narrow lost-motion slot wherein the hypotenuse of the triangle mechanism is constructed of a tensioning device that can be lengthened or shortened, such as a turn buckle, causing upward and downward forces to be transferred between the areas of the playing surface panel to which the rail and brackets are connected to render the panel planar and at the same time not rigidly connect these panel areas to each other, allowing for normal expansion and contraction laterally in the playing surface area without causing further warpage thereof.
Inventors
- 👤 X Leonhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:06
CPC Classifications
A; A47; A47B; A47B25/00; A47B25/003
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
An assembly for connection to the under surface of a warpable panel to adjust the same to a planar position, comprising a longitudinally extending rail member adapted for mounting to the under surface of the panel, at least one lug means connected to and depending from said rail and having a free end, said lug means having one pivotal bearing support means adjacent said rail and another pivot bearing support means adjacent the free end thereof, a slide member, a guide arm member connected to said slide member and pivotally connected to said one pivot bearing support means, a longitudinally adjustable arm member pivotally connected at opposite ends to said slide member and said another pivot bearing support means, and a bracket adapted for connection to the underside of the panel and having a lost motion guide means engaging said slide member whereby said slide means is freely movable in the longitudinal direction of said guide arm member.
Claim 2
Dependent Claim
158 words
An assembly for connection to the under surface of a warpable panel to adjust the same to a planar position, comprising a longitudinally extending rail member adapted for mounting to the under surface of the panel, at least one lug means connected to and depending from said rail and having a free end, said lug means having one pivotal bearing support means adjacent said rail and another pivot bearing support means adjacent the free end thereof, a slide member, a guide arm member connected to said slide member and pivotally connected to said one pivot bearing support means, a longitudinally adjustable arm member pivotally connected at opposite ends to said slide member and said another pivot bearing support means, and a bracket adapted for connection to the underside of the panel and having a lost motion guide means engaging said slide member whereby said slide means is freely movable in the longitudinal direction of said guide arm member.
Claim 3
Dependent Claim
46 words
An assembly as set forth in claim 1 in which said lost motion guide means is connected to said slide means to substantially restrain movement of said slide means in a direction at right angles to the panel and longitudinal axis of said guide arm member.
Claim 4
Dependent Claim
16 words
An assembly as set forth in claim 1 in which said rail is T-shaped in cross-section.
Claim 5
Dependent Claim
21 words
An assembly as set forth in claim 1 in which said rail is rigid and substantially torsion-free throughout the length thereof.
Claim 6
Dependent Claim
54 words
An assembly as set forth in claim 1 in which said lug means comprises a pair of spaced depending lugs, and said one pivot bearing support means and said another pivot bearing support means including registered apertures through said pair of spaced lug and individual pivot pin means engaged through said respective registereD apertures.
Claim 7
Dependent Claim
21 words
An assembly as set forth in claim 1 in which said guide arm member extends laterally outwardly from said rail member.
Claim 8
Dependent Claim
18 words
An assembly as set forth in claim 1 in which said longitudinally adjustable arm member comprises a turnbuckle.
Claim 9
Dependent Claim
36 words
An assembly as set forth in claim 7 in which said guide arm member comprises a pair of spaced arms rigidly connected to said slide member, and said turnbuckle positioned between said pair of spaced arms.
Claim 10
Dependent Claim
44 words
Apparatus as set forth in claim 1 including another lug means on the opposite side of said rail from said first-mentioned lug means, and another guide arm member, slide member, longitudinally adjustable arm member and bracket connected thereto as set forth in claim 1.
Claim 11
Dependent Claim
37 words
An assembly as set forth in claim 9 in which the assemblies connected to the lug means on opposite sides of said rail are connected in opposition to each other and adjacent opposite ends of said rail.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |