US3747895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring extender
Assignee: Individual
•
Filing: 1971-11-04
•
Granted: 1973-07-24
•
Expires: 1991-11-04
Abstract
Abstract An inexpensive spring extender comprising: a pair of arms one of which has thread engagement with a lead screw and the other of which is swivelled to the lead screw between opposing abutments. The arms are adapted to engage opposite ends of a coil spring, and the lead screw when actuated extends the spring.
Inventors
- 👤 M Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:04
CPC Classifications
B; B25; B25B; B25B27/00; B25B27/14; B25B27/30; B25B27/302; B25B27/306; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53613; Y10T29/53622
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
A spring extender comprising: inner and outer members constructed and arranged so that said inner member is guided for longitudinal movement by said outer member; a threaded rod extending longitudinally through said inner and outer members; a pair of lateral spring pick-up arms the first of which is mounted on said inner member and the second of which is secured to said outer member against longitudinal movement relative thereto; and four collars arranged in that order with the first collar being secured to said inner member and threaded on said rod, the second and fourth collars being secured to said threaded rod, and the third collar being nonrotatably secured to said outer member; said third collar being devoid of thread engagement with said rod, and said fourth collar having abutment surfaces for applying torqUe to said threaded rod.
Claim 2
Dependent Claim
138 words
A spring extender comprising: inner and outer members constructed and arranged so that said inner member is guided for longitudinal movement by said outer member; a threaded rod extending longitudinally through said inner and outer members; a pair of lateral spring pick-up arms the first of which is mounted on said inner member and the second of which is secured to said outer member against longitudinal movement relative thereto; and four collars arranged in that order with the first collar being secured to said inner member and threaded on said rod, the second and fourth collars being secured to said threaded rod, and the third collar being nonrotatably secured to said outer member; said third collar being devoid of thread engagement with said rod, and said fourth collar having abutment surfaces for applying torqUe to said threaded rod.
Claim 3
Dependent Claim
40 words
The spring extender of claim 1 wherein said second pick-up arm is secured to said outer member by means constructed and arranged to both journal said pick-up arm for rotation about said outer member and prevent longitudinal movement relative thereto.
Claim 4
Dependent Claim
97 words
The spring extender of claim 2 wherein said outer member comprises a U-shaped channel member with an open side, said inner member fitting into and being guided by inwardly facing surfaces of the sidewalls of said U-shaped channel member, said threaded rod projecting through said outer member, and said second pick-up arm being journaled about the projection of said threaded rod, a fifth collar fixed to said projection of said threaded rod, and said second pick-up arm being confined between said fifth collar and the ned between said fifth collar and the end of said outer member.
Claim 5
Dependent Claim
125 words
A spring extender comprising: inner and outer telescoping tubes, said inner tube projecting from one end of said outer tube; a threaded rod in the center of said tubes; a pair of lateral spring pick-up arms one of which is mounted on said projecting end of said inner tube, and the other of which is mounted on said outer tube; and four collars arranged in that order with the first secured to said inner tube and threaded on said rod, the second and fourth being secured to said threaded rod, and the third being nonrotatably secured to said other pick-up arm; said third being devoid of threaded engagement with said rod, and said fourth collar having abutment surfaces for applying torque to said threaded rod.
Claim 6
Dependent Claim
125 words
A spring extender comprising: inner and outer telescoping tubes, said inner tube projecting from one end of said outer tube; a threaded rod in the center of said tubes; a pair of lateral spring pick-up arms one of which is mounted on said projecting end of said inner tube, and the other of which is mounted on said outer tube; and four collars arranged in that order with the first secured to said inner tube and threaded on said rod, the second and fourth being secured to said threaded rod, and the third being nonrotatably secured to said other pick-up arm; said third being devoid of threaded engagement with said rod, and said fourth collar having abutment surfaces for applying torque to said threaded rod.
Claim 7
Dependent Claim
45 words
The spring extender of claim 4 wherein said one of said pick-up arms is part of a cap fitting over said smaller tube, and said other pick-up arm and third collar are part of another cap fitting over the opposite end of said outer tube.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |