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US3780974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the fixing,being combined with slow lowering,of the sliding pole of a portable motion picture screen stand
Assignee: Individual
•
Filing: 1971-12-27
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Granted: 1973-12-25
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Expires: 1991-12-27
Abstract
Abstract A device for the locking and slow lowering of the sliding pole of a portable motion picture screen stand, which is characterized by mounting a sliding pole into a hollow supporting pole so that the former can go up and down along the inside of the latter supporting piece is fixed to a hole which is provided at the upper part or at an appropriate part of the hollow supporting pole and a lever is hinged to said supporting piece by an axis. In addition, the lower end of said lever projects from the outside of the hollow supporting pole by the force of a spring and the inside of the lever comes in contact with the outside of the sliding pole with the upper and lower points of contact which are provided at about even distance from the axis and which have a dent therebetween.
Inventors
- 👤 S Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:14
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/58
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
212 words
A device for locking and slowly lowering the sliding pole of a portable motion picture screen comprising a sliding pole telescopically mounted in a hollow supporting pole so that said sliding pole is adapted to move up and down along the inside of said hollow supporting pole, said hollow pole having a hole in a side wall thereof and a supporting means securely mounted on said hollow supporting pole adjacent said hole, a lever pivotally mounted on said means by an axle, said lever having a lower and an upper end, said upper end having first and second spaced apart contact points thereon, said points being positioned on the side of said lever and facing said hole and said sliding pole exposed therein, said first point being positioned above said axle and said second point being positioned below said axle, spring means forcing said lower end of said lever outwardly away from said hollow supporting pole and simultaneously forcing said first contact point to press against said sliding pole through said hole for holding said sliding pole against downward movement, said second contact point being adapted to contact said sliding pole through said hole for holding said sliding pole against downward movement when said lower end of said lever is firmly pressed.
Claim 2
Independent Claim
212 words
A device for locking and slowly lowering the sliding pole of a portable motion picture screen comprising a sliding pole telescopically mounted in a hollow supporting pole so that said sliding pole is adapted to move up and down along the inside of said hollow supporting pole, said hollow pole having a hole in a side wall thereof and a supporting means securely mounted on said hollow supporting pole adjacent said hole, a lever pivotally mounted on said means by an axle, said lever having a lower and an upper end, said upper end having first and second spaced apart contact points thereon, said points being positioned on the side of said lever and facing said hole and said sliding pole exposed therein, said first point being positioned above said axle and said second point being positioned below said axle, spring means forcing said lower end of said lever outwardly away from said hollow supporting pole and simultaneously forcing said first contact point to press against said sliding pole through said hole for holding said sliding pole against downward movement, said second contact point being adapted to contact said sliding pole through said hole for holding said sliding pole against downward movement when said lower end of said lever is firmly pressed.
Claim 3
Dependent Claim
22 words
The device of claim 1 wherein said hole and said supporting means are located near the upper end of said supporting pole.
Claim 4
Dependent Claim
30 words
The device of claim 1 wherein said first and second contact points are equidistant from said axle and wherein a dent is located between said first and second contact points.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |