Patent US3822848A successfully refreshed from Google Patents.
US3822848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection screen holder
Assignee: Individual
•
Filing: 1971-05-18
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Granted: 1974-07-09
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Expires: 1991-05-18
Abstract
Abstract This invention relates to a picture screen holder of the wall mounted bracket type and provides for manual adjustment of the screen in a vertical angular as well as horizontal position by the operator or instructor standing in one position relative thereto and thus facilitates the unobstructed viewing of the picture screen by an audience and prevents any keystone or distortion effects of the picture produced by a projector.
Inventors
- 👤 P Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:05
CPC Classifications
F; F16; F16M; F16M11/00; F16M11/02; F16M11/04; F16M11/043; F16M11/046; F16M11/20; F16M11/2007; F16M11/2014; F16M13/00; F16M13/02; G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/58
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
202 words
In a projection screen supporting frame apparatus having a wall supported bracket arm with aligned bracket parts for holding the screen in a vertically or horizontally adjustable position, a. the improvement comprising a vertically disposed screen supporting standard engaging the sides of said frame; b. a substantially U-shaped plate guide and clamp unit having parallel leg members engaging the sides of said bracket arm of one of said bracket parts at one extremity thereof and slidably engaging said standard; c. a horizontally disposed pivot bolt passing through one of said bracket parts of the arm and said leg members of said unit; d. threaded nut means on said pivot belt adapted to draw said leg members together on said arm to form a clamp for regulating the horizontal tilting movement of said screen; e. a calibrated constant tension coiled spring counterbalance device mounted on said U-shaped guide, and means for connecting one end of said spring to said standard for counterbalancing the weight of said standard and the screen carried thereby, f. and including disc shaped plastic members interposed between the sides of one of said bracket parts oF said arm and said guide leg members to form a horizontal pivot joint.
Claim 2
Dependent Claim
202 words
In a projection screen supporting frame apparatus having a wall supported bracket arm with aligned bracket parts for holding the screen in a vertically or horizontally adjustable position, a. the improvement comprising a vertically disposed screen supporting standard engaging the sides of said frame; b. a substantially U-shaped plate guide and clamp unit having parallel leg members engaging the sides of said bracket arm of one of said bracket parts at one extremity thereof and slidably engaging said standard; c. a horizontally disposed pivot bolt passing through one of said bracket parts of the arm and said leg members of said unit; d. threaded nut means on said pivot belt adapted to draw said leg members together on said arm to form a clamp for regulating the horizontal tilting movement of said screen; e. a calibrated constant tension coiled spring counterbalance device mounted on said U-shaped guide, and means for connecting one end of said spring to said standard for counterbalancing the weight of said standard and the screen carried thereby, f. and including disc shaped plastic members interposed between the sides of one of said bracket parts oF said arm and said guide leg members to form a horizontal pivot joint.
Claim 3
Dependent Claim
33 words
Apparatus of the character described in claim 1 including an elongated bow shaped leaf spring interposed between the end of the U-shaped guide to cushion the movement of said standard in said guide.
Claim 4
Dependent Claim
32 words
Apparatus of the character described in claim 1 including an adjustable slide plate secured at the lower extremity of said standard for securing and manipulating a roll screen of any desired length.
Claim 5
Dependent Claim
40 words
Apparatus of the character described in claim 3 including cushion means mounted at the upper extremity of said standard and at the lower extremity of said adjustable means for contacting a wall or ceiling during the manipulation of the standard.
Claim 6
Dependent Claim
42 words
Apparatus of the character described in claim 1 including means for adjusting the length of said standard to change the distance of the screen by the vertical spacing between the top and bottom screen holders whereby different length screens may be held.
Claim 7
Dependent Claim
28 words
Apparatus of the character described in claim 1 including a brake member carried by the guide and engaging said standard to control the drifting movement of said standard.
Claim 8
Dependent Claim
34 words
Apparatus of the character described in claim 1 including a plate member secured to one end of said bracket arm and a wall socket member formed to receive said plate member in rigid relation.
References Cited (Backward Citations)
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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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |