US3849920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick release and adjustable picture frame clamp
Assignee: Individual
•
Filing: 1974-02-22
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Granted: 1974-11-26
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Expires: 1994-02-22
Abstract
Abstract A picture frame clamp having four corner brackets for holding the respective corners at a right angular relationship. The four corner brackets are four diagonally extending strap lengths which are connected adjacent the intersecting ends thereof by a toggle type clamp to firmly clamp the corners together in a right angular relationship. The straps are connected to the corners so as to be capable of varying the length thereof to the clamp at the intersection thereby to permit the clamp to be adaptable for use for different size picture frames.
Inventors
- 👤 L Trowbridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:23
CPC Classifications
A; A47; A47G; A47G1/00; A47G1/06; A47G1/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A picture frame clamp comprising four corner brackets having wall means for engaging the four corners of a picture frame so as to maintain the corners at right angles relative to each other, diagonally extending strap means attached to each of said corners, a bight connecting two of said strap means, threaded block means connecting the two remaining ones of said strap means, and toggle clamp means connecting said bight and said block for moving said corner brackets toward each other to clamp the corners of a picture frame, and away from each other to release the picture frame.
Claim 2
Dependent Claim
99 words
A picture frame clamp comprising four corner brackets having wall means for engaging the four corners of a picture frame so as to maintain the corners at right angles relative to each other, diagonally extending strap means attached to each of said corners, a bight connecting two of said strap means, threaded block means connecting the two remaining ones of said strap means, and toggle clamp means connecting said bight and said block for moving said corner brackets toward each other to clamp the corners of a picture frame, and away from each other to release the picture frame.
Claim 3
Dependent Claim
65 words
The invention as defined in claim 1 wherein said toggle clamp means comprises a bolt threaded at one end into said block, and a clamp handle pivotally mounted adjacent the other end of said bolt, said clamp handle embracing said bight so that turning movement of said clamp handle about its pivot causes the bight to be moved toward or away from said threaded block.
Claim 4
Dependent Claim
20 words
The invention as defined in claim 2 wherein said strap means are of adjustable length relative to said corner brackets.
Claim 5
Dependent Claim
98 words
The invention as defined in claim 3 wherein said corner brackets each include a diagonally disposed spaced opening and said strap means includes telescoping lengths of which one length is fixed to said bight or said bracket and the other length is formed with a hook engageable within a selective one of said openings in said corner brackets, and wherein the said one of said lengths of said strap means is provided with a hooked end which is selectively positionable in one of a plurality of openings provided in the other of said lengths of said strap means.
Claim 6
Dependent Claim
34 words
The invention as defined in claim 2 wherein said clamp handle is mounted on pivot support means threaded on said bolt to a thread of opposite hand from the thread entering said block means.
Claim 7
Dependent Claim
54 words
The invention as defined in claim 5 wherein said corner blocks include a diagonally disposed slot for guiding said strap and wherein said strap means includes a plurality of spaced openings, and hook means mounted on said bracket engageable wiTh a selective one of said openings to vary the length of the strap means.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |