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Patent US4643384A successfully refreshed from Google Patents.
US4643384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Easel
Assignee: Individual
•
Filing: 1986-01-03
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Granted: 1987-02-17
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Expires: 2006-01-03
Abstract
Abstract A studio easel for selective tension or compression clamping of a canvas painting stretcher frame having top and bottom cross bars in fixed upright position at a desired level has a pair of elongated channel tracks for mounting upright in laterally spaced relation on a studio wall with a pair of opposed shoes slidable in each track. Grip locks on the shoes secure them to their tracks, a stretcher frame support on one shoe of each pair engages a cross bar of the frame. A push-pull clamp on the other shoe of the pair engages the opposite cross bar of the stretcher frame. The shoes are mounted for stretch clamping the frame by positioning the frame support shoe above the push-pull clamp shoes, hanging the top cross bar of the frame on the support shoes, engaging the bottom support frame with the push-pull clamps and pulling the clamps to stretch the frame. In the compression loading position the support shoes are mounted under the push-pull clamp shoes with the bottom cross bar of the frame resting on the supports and with the clamps being pushed against the top cross bar to force the frame downwardly against the bottom supports. For small frames, a single track arrangement can be provided.
Inventors
- 👤 Charles A. Guerin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:47
CPC Classifications
A; A47; A47B; A47B97/00; A47B97/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
133 words
An easel for clamping in upright position at a desired level a canvas stretching frame with top and bottom cross bars having inner and outer faces behind the canvas which comprises an elongated track means, means for mounting said track means in upright position, a plurality of shoe means reversibly mounted on said track means in first and second positions, means locking said shoe means at selected levels on said track means, means on said shoe means respectively engaging an inner face of a frame cross bar in a first position of the shoe means and an outer face of a cross bar in a second position of the shoe means, and a push-pull clamp on a shoe means shiftable to selectively tension clamp and compression clamp the frame to the track means.
Claim 2
Dependent Claim
133 words
An easel for clamping in upright position at a desired level a canvas stretching frame with top and bottom cross bars having inner and outer faces behind the canvas which comprises an elongated track means, means for mounting said track means in upright position, a plurality of shoe means reversibly mounted on said track means in first and second positions, means locking said shoe means at selected levels on said track means, means on said shoe means respectively engaging an inner face of a frame cross bar in a first position of the shoe means and an outer face of a cross bar in a second position of the shoe means, and a push-pull clamp on a shoe means shiftable to selectively tension clamp and compression clamp the frame to the track means.
Claim 3
Dependent Claim
29 words
The easel of claim 1 wherein the track means includes a pair of channel tracks in laterally spaced relation and a pair of shoe means slidable on each track.
Claim 4
Dependent Claim
23 words
The easel of claim 1 wherein the means for mounting the track means in upright position are fasteners anchored to a studio wall.
Claim 5
Dependent Claim
13 words
The easel of claim 1 wherein the track means is a single track.
Claim 6
Dependent Claim
35 words
The easel of claim 1 wherein the track means includes a channel track with an open slot along the length thereof and the shoe means ride on the channel track and project through the slot.
Claim 7
Dependent Claim
30 words
The easel of claim 5 wherein the portion of the shoe means projecting into the slot have members depending therefrom engaging the track means on opposite sides of the slot.
Claim 8
Dependent Claim
84 words
The easel of claim 1 wherein the track means includes a U-shaped elongated member having a bight portion adapted to be secured to a studio wall, side legs projecting from the bight portion, inturned lips on the side legs and a slot between the lips, and wherein each shoe means has a base plate riding on the side legs with a rib projecting through the slot, and means depending from the shoe means overlie the lips to retain the shoe means on the track.
Claim 9
Dependent Claim
41 words
The easel of claim 7 including bolts extending through the shoe means into the channel of the track, and nuts threaded on said bolts riding on the lips of the track to support the shoes on the track in slidable relation.
Claim 10
Dependent Claim
36 words
The easel of claim 8 wherein one of said bolts is rotatable to tighten the screw means against the track lips into fixed gripping relation therewith for locking the shoe means in position on the track.
Claim 11
Dependent Claim
51 words
The easel of claim 1 including channel tracks, shoe means slidably supported on said tracks with rib portions projecting into the channel, transverse slots in the rib means, plate nuts in said slots riding on the track means, and bolts rotatably supported on the shoe means threaded into said plate nuts.
Claim 12
Dependent Claim
25 words
The easel of claim 10 wherein one of the bolts is a clamp bolt and the plate nut thereon has grooves receiving the channel track.
Claim 13
Dependent Claim
22 words
The easel of claim 1 wherein the clamp selectively mounts compression and tension fingers for engaging a cross bar of the frame.
Claim 14
Dependent Claim
21 words
The easel of claim 12 wherein the fingers are adjustable on the clamp to control the clamp load on the frame.
Claim 15
Dependent Claim
124 words
A studio easel for tension clamping of a canvas stretching frame with a top cross bar having an under face and a bottom cross bar having a top face in fixed upright position at a desired level which comprises a pair of elongated channel tracks, means for mounting said tracks in upright laterally spaced position on a studio wall, top and bottom shoes slidably mounted on each track, means locking said shoes at selected levels on the tracks, means on the top shoes engaging the under face of the top cross bar to suspend the frame on the tracks, and push-pull clamp means on the bottom shoes engaging the top face of the bottom cross bar for tension loading the frame on the tracks.
Claim 16
Dependent Claim
124 words
A studio easel for tension clamping of a canvas stretching frame with a top cross bar having an under face and a bottom cross bar having a top face in fixed upright position at a desired level which comprises a pair of elongated channel tracks, means for mounting said tracks in upright laterally spaced position on a studio wall, top and bottom shoes slidably mounted on each track, means locking said shoes at selected levels on the tracks, means on the top shoes engaging the under face of the top cross bar to suspend the frame on the tracks, and push-pull clamp means on the bottom shoes engaging the top face of the bottom cross bar for tension loading the frame on the tracks.
Claim 17
Dependent Claim
124 words
A studio easel for compression clamping of a canvas stretching frame with a top cross bar having a top face and a bottom cross bar having a bottom face in fixed upright position at a desired level which comprises a pair of elongated channel tracks, means for mounting said tracks in upright laterally spaced relation on a studio wall, top and bottom shoes slidably mounted on each track, means locking said shoes at selective levels on the tracks, means on the bottom shoes engaging the bottom face of the bottom cross bar to support the frame on the tracks, and push-pull clamp means on the top shoes engaging a top face of the top cross bar for compression loading the frame on the tracks.
Claim 18
Dependent Claim
124 words
A studio easel for compression clamping of a canvas stretching frame with a top cross bar having a top face and a bottom cross bar having a bottom face in fixed upright position at a desired level which comprises a pair of elongated channel tracks, means for mounting said tracks in upright laterally spaced relation on a studio wall, top and bottom shoes slidably mounted on each track, means locking said shoes at selective levels on the tracks, means on the bottom shoes engaging the bottom face of the bottom cross bar to support the frame on the tracks, and push-pull clamp means on the top shoes engaging a top face of the top cross bar for compression loading the frame on the tracks.
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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |