US3608720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen-cloth-securing means
Assignee: SYMONS BROTHERS CO
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Filing: 1969-05-07
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Granted: 1971-09-28
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Expires: 1989-05-07
Abstract
Abstract A screen-cloth-tensioning device in which cloth is tensioned, and in which the operator can work within the periphery of the screen in applying or removing tensioned screen cloth, so that it is possible to work down through a multideck screen structure, the work being done primarily within the periphery of the screen.
Inventors
- 👤 Edgar P Symons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:59
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/48; B07B1/49
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
298 words
For use in a scrEen frame having transversely connected side members, a screen cloth-tensioning assembly including vertically movable transverse members interposed between fixed transverse members, and movable screen-cloth-receiving subframes positioned between the side frame members, each subframe being freely movable in relation to and upwardly removable from the screen frame, each subframe having a pivotal connection with the screen frame, such pivotal connections being constituted by pivot abutments extending beyond the ends of each subframe, and pivot seats mounted on the side frame members to receive the pivot abutments of the subframes, there being a subframe member having a screen-cloth-receiving edge adjacent to and beneath a branch of each of the fixed transverse members, and other subframes having screen-cloth-receiving edges opposable to and beneath a branch of the vertically movable transverse members, there being a pair of subframes between each of the fixed transverse members and the adjacent vertically movable transverse members, panels of screen cloth having ends adapted to be hooked over the edges of each such pair of subframes, with one such end portion beneath a branch of a fixed transverse member, and one beneath a branch of a vertically movable transverse member, the pivot seats for the subframes adjacent to the vertically movable transverse members being movable longitudinally along the side frame members, yielding means tending to urge the movable pivot seats toward the vertically movable transverse members, and fixed stops to limit the movement of the pivot seats, and removable sideplates positioned within the side frame members, each sideplate having its upper edge bearing against a side frame member and its lower edge against the transverse members, said sideplates holding the vertically movable transverse members down in operating position with the screen cloth under tension, and confining the material flow to the screen cloth.
Claim 2
Dependent Claim
298 words
For use in a scrEen frame having transversely connected side members, a screen cloth-tensioning assembly including vertically movable transverse members interposed between fixed transverse members, and movable screen-cloth-receiving subframes positioned between the side frame members, each subframe being freely movable in relation to and upwardly removable from the screen frame, each subframe having a pivotal connection with the screen frame, such pivotal connections being constituted by pivot abutments extending beyond the ends of each subframe, and pivot seats mounted on the side frame members to receive the pivot abutments of the subframes, there being a subframe member having a screen-cloth-receiving edge adjacent to and beneath a branch of each of the fixed transverse members, and other subframes having screen-cloth-receiving edges opposable to and beneath a branch of the vertically movable transverse members, there being a pair of subframes between each of the fixed transverse members and the adjacent vertically movable transverse members, panels of screen cloth having ends adapted to be hooked over the edges of each such pair of subframes, with one such end portion beneath a branch of a fixed transverse member, and one beneath a branch of a vertically movable transverse member, the pivot seats for the subframes adjacent to the vertically movable transverse members being movable longitudinally along the side frame members, yielding means tending to urge the movable pivot seats toward the vertically movable transverse members, and fixed stops to limit the movement of the pivot seats, and removable sideplates positioned within the side frame members, each sideplate having its upper edge bearing against a side frame member and its lower edge against the transverse members, said sideplates holding the vertically movable transverse members down in operating position with the screen cloth under tension, and confining the material flow to the screen cloth.
Claim 3
Dependent Claim
56 words
The structure of claim 1 characterized in that for each screen cloth panel two subframes are employed, these being substantially indentical but placed between the side frame members in reverse relationship, whereby for each cloth panel one subframe edge opposes a fixed transverse member and the corresponding opposite subframe edge opposes the vertically movable transverse member.
Claim 4
Dependent Claim
93 words
The structure of claim 1 characterized in that when the screen-tensioning structure is in operating position with the sideplates in place the yielding means is effective to tension the screen cloth, the thrust of the yielding means and the tension in the screen cloth being effective to hold the sideplates, the vertically movable transverse members, the subframes and the screen cloth securely against movement with respect to the side frame members, thereby assuring that the entire screen-cloth-tensioning device will move in unison with the side frame members when the screen is in operation.
Claim 5
Dependent Claim
108 words
For use in a screen frame having transversely connected side frame members, a screen-cloth-tensioning assembly including fixed transverse members and vertically movable transverse members, a vertically movable transverse member being interposed between the fixed transverse members, panels of screen cloth positioned between each fixed transverse member and an adjacent vertically movable transverse member with one end of each screen cloth panel beneath a branch of a fixed transverse member and the other end beneath a branch of a vertically movable transverse member, means for tensioning the screen cloth by downward movement of the vertically movable transverse member, and means for maintaining the screen cloth under tension during operation.
Claim 6
Dependent Claim
108 words
For use in a screen frame having transversely connected side frame members, a screen-cloth-tensioning assembly including fixed transverse members and vertically movable transverse members, a vertically movable transverse member being interposed between the fixed transverse members, panels of screen cloth positioned between each fixed transverse member and an adjacent vertically movable transverse member with one end of each screen cloth panel beneath a branch of a fixed transverse member and the other end beneath a branch of a vertically movable transverse member, means for tensioning the screen cloth by downward movement of the vertically movable transverse member, and means for maintaining the screen cloth under tension during operation.
Claim 7
Dependent Claim
51 words
The structure of claim 4 characterized in that the means for holding the screen cloth panels tensioned during use is constituted by sideplates clamped between the side frame members and the transverse members, with the upper edges held by the side frame members and their lower edges abutting the transverse members.
Claim 8
Dependent Claim
118 words
A scrEen-tensioning mechanism comprising a cloth-supporting subframe having pivotal abutments extending beyond its sides that are supported by pivot seats within a main screening frame, springs adapted to urge the pivot seats and the subframe pivotal abutments in a longitudinal direction, a screening cloth secured to the side frame members at one end and hooked over the subframe at the other end when the subframe is at an angle with its normal longitudinal position, means for tensioning the screening cloth when the screen cloth and subframe are moved into a generally longitudinal position by applying spring force against the subframe pivot abutments, and further means for securing the subframe and screening cloth in its normal longitudinal operating position.
Claim 9
Dependent Claim
118 words
A scrEen-tensioning mechanism comprising a cloth-supporting subframe having pivotal abutments extending beyond its sides that are supported by pivot seats within a main screening frame, springs adapted to urge the pivot seats and the subframe pivotal abutments in a longitudinal direction, a screening cloth secured to the side frame members at one end and hooked over the subframe at the other end when the subframe is at an angle with its normal longitudinal position, means for tensioning the screening cloth when the screen cloth and subframe are moved into a generally longitudinal position by applying spring force against the subframe pivot abutments, and further means for securing the subframe and screening cloth in its normal longitudinal operating position.
Claim 10
Dependent Claim
37 words
The structure of claim 6 characterized by the provision of a vertically movable transverse member effective when downwardly moved, to move two adjacent subframes into their generally longitudinal position, thereby simultaneously tensioning two adjacent screen cloth panels.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |