US3818550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retention devices for sheet material
Assignee: Individual
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Filing: 1972-06-05
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Granted: 1974-06-25
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Expires: 1992-06-05
Abstract
Abstract A retention device for gripping, anchoring and/or tensioning sheet material, particularly plastics sheeting, comprises a wedge the thin end of which is extended for manipulation, the wedge including the extension thereof being split in at least two parts for successive insertion through a slot with sheet material wrapping surfaces of the wedge. The slot may be formed in a structure to which the material is to be secured or in a support member to be secured to the structure. In its preferred form, the device comprises flexible strips of angle section with an inner flange face having a ramp and step profile, two strips being inserted successively and back-to-back in a channel-section strip support to form a wedge looping the sheet material in the channel. Spaced wedge expanders may be pressed between the strips. The device is particularly applicable for retention of plastics sheeting such as sheet polythene in canopies, hoods, greenhouses shelters and wind breaks.
Inventors
- 👤 H Cresswell
- 👤 T Nurseries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:32
CPC Classifications
F; F16; F16B; F16B5/00; F16B5/06; F16B5/0692; E; E04; E04D; E04D5/00; E04D5/14; E04D5/144; E04D5/146; E04D5/147; E04H; E04H15/00; E04H15/32; E04H15/64; E04H15/642; E04H15/646; F16B19/00; F16B19/04; F16B19/08; F16B19/10; F16B19/1027; F16B19/1036; F16B19/1081; Y; Y10; Y10T; Y10T24/00; Y10T24/44; Y10T24/44034; Y10T24/44043; Y10T24/44051; Y10T24/4406
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
184 words
Retention means for gripping and tensioning sheet material comprising metal strip of uniform channel section, the channelsection flanges extending in initially generally parallel relation from the roots thereof and then being inclined inwardly to terminate in parallel end portions to define a slot, and extruded flexible plastics strip material of uniform angle section, the angle section providing a thin narrow flange and a wider flange stepped on its inner face to increase in thickness from a thin root portion to a thicker parallel-walled portion and then to a bulbous ramp-sided end portion, such that two coextensive lengths of the plastics strip material with the outer wide-flange faces thereof in contact form a split wedge around which the sheet material can be looped within the channel-section strip and gripped by wedging action of the bulbous portions of the plastics strips against the channel-section flanges at the inwardly-inclined parts of said flanges, the two lengths of plastics strip being insertable in succession through said slot to leave the narrow flanges protruding out of the slot for manipulation to move the bulbous portions in the channel-section strip.
Claim 2
Dependent Claim
184 words
Retention means for gripping and tensioning sheet material comprising metal strip of uniform channel section, the channelsection flanges extending in initially generally parallel relation from the roots thereof and then being inclined inwardly to terminate in parallel end portions to define a slot, and extruded flexible plastics strip material of uniform angle section, the angle section providing a thin narrow flange and a wider flange stepped on its inner face to increase in thickness from a thin root portion to a thicker parallel-walled portion and then to a bulbous ramp-sided end portion, such that two coextensive lengths of the plastics strip material with the outer wide-flange faces thereof in contact form a split wedge around which the sheet material can be looped within the channel-section strip and gripped by wedging action of the bulbous portions of the plastics strips against the channel-section flanges at the inwardly-inclined parts of said flanges, the two lengths of plastics strip being insertable in succession through said slot to leave the narrow flanges protruding out of the slot for manipulation to move the bulbous portions in the channel-section strip.
Claim 3
Dependent Claim
91 words
A retention device for sheet material comprising a wedge the thin end of which is extended for manipulation, the wedge including the extension thereof including two parts for successive insertion through a slot with sheet material wrapping surfaces of the wedge, each of said parts of the wedge being formed from moulded plastics strip material of angle section of which one flange profile is stepped from a small thickness adjacent the flange root to a larger uniform thickness and then by a ramp to a still thIcker bulbous portion. directed wedged
Claim 4
Dependent Claim
91 words
A retention device for sheet material comprising a wedge the thin end of which is extended for manipulation, the wedge including the extension thereof including two parts for successive insertion through a slot with sheet material wrapping surfaces of the wedge, each of said parts of the wedge being formed from moulded plastics strip material of angle section of which one flange profile is stepped from a small thickness adjacent the flange root to a larger uniform thickness and then by a ramp to a still thIcker bulbous portion. directed wedged
Claim 5
Dependent Claim
129 words
A retention device for flexible sheet material comprising a strip support member of channel section with opposed inner inclined surfaces converging to define a slot and at least two separate retaining strips insertable in succession through the slot, together to make up a ramped cross section for looping and wedging the sheet material in the support member, with each of said retaining strips projecting from the slot for manipulation, said ramped cross section of said strips being defined by surfaces that are disposed one on each strip and are direced away from each other and that have the same inclination as the first-mentioned inclined surfaces and that have portions spaced apart a distance greater than the width of said slot when said retaining strips are edge in said slot.
Claim 6
Dependent Claim
129 words
A retention device for flexible sheet material comprising a strip support member of channel section with opposed inner inclined surfaces converging to define a slot and at least two separate retaining strips insertable in succession through the slot, together to make up a ramped cross section for looping and wedging the sheet material in the support member, with each of said retaining strips projecting from the slot for manipulation, said ramped cross section of said strips being defined by surfaces that are disposed one on each strip and are direced away from each other and that have the same inclination as the first-mentioned inclined surfaces and that have portions spaced apart a distance greater than the width of said slot when said retaining strips are edge in said slot.
Claim 7
Dependent Claim
23 words
A retention device according to claim 3, wherein the converging inner surfaces of the channel section have parallel surface extensions at the slot.
Claim 8
Dependent Claim
51 words
A retention device according to claim 3, wherein the retaining strips are of moulded plastics material of angle section of which one flange profile is stepped from a small thickness adjacent the flange root to a larger uniform thickness and then by a ramp to a still thicker bulbous end portion.
Claim 9
Dependent Claim
21 words
A retention device according to claim 3, including means for interposition between the retaining strips for expanding the wedge formed thereby.
Claim 10
Dependent Claim
20 words
A retention device according to claim 3, including a capping strip for covering the retaining strips projecting from the slot.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |