US4358215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Key connection
Assignee: Individual
•
Filing: 1980-10-20
•
Granted: 1982-11-09
•
Expires: 2000-10-20
Abstract
Abstract A key connection having the key shaped like a round helical spring and inserted, with possible preload, into the keyslots of a triangular cross-section shape.
Inventors
- 👤 Evgeny I. Rivin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:59
CPC Classifications
F; F16; F16D; F16D1/00; F16D1/06; F16D1/08; F16D1/0876; F16B; F16B3/00; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7018; Y10T403/7021; Y10T403/7022
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
154 words
A key connection between two components, comprising: keyslots in the first and second components to be connected, said keyslots being situated adjacent to each other to create a common opening for insertion of a key; a key having a helical spring-like shape and inserted in said opening; the key having a free external diameter before assembly larger than the diameter of the inscribed circle of said opening for key insertion, whereby the key must be twisted around its axis before insertion or for disassembly or for relative displacement of the connected components in order to reduce its external diameter to less than the diameter of the inscribed circle of said opening so as to establish a preload force on the keyslots; the degree of preload force being established by utilizing parameters which include the free external diameter of the key, the number of coils, and the cross-sectional shape and diameter of the key stock.
Claim 2
Dependent Claim
154 words
A key connection between two components, comprising: keyslots in the first and second components to be connected, said keyslots being situated adjacent to each other to create a common opening for insertion of a key; a key having a helical spring-like shape and inserted in said opening; the key having a free external diameter before assembly larger than the diameter of the inscribed circle of said opening for key insertion, whereby the key must be twisted around its axis before insertion or for disassembly or for relative displacement of the connected components in order to reduce its external diameter to less than the diameter of the inscribed circle of said opening so as to establish a preload force on the keyslots; the degree of preload force being established by utilizing parameters which include the free external diameter of the key, the number of coils, and the cross-sectional shape and diameter of the key stock.
Claim 3
Dependent Claim
36 words
The key connection of claim 1 wherein the key has its end coil deformed to provide a lever for twisting the key around its axis before insertion, during disassembly or for relative displacement of the components.
Claim 4
Dependent Claim
17 words
The key connection of claim 1 wherein said keyslot in the first component has a triangular crossection.
Claim 5
Dependent Claim
19 words
The key connection of claim 1 wherein said keyslots in the first and second connected components have triangular crossections.
Claim 6
Dependent Claim
17 words
The key connection of claim 1 wherein the sides of said keyslot have a concave cylindrical shape.
Claim 7
Dependent Claim
20 words
The key connection of claim 1 wherein the sides of said keyslots in the connected components have concave cylindrical shapes.
Claim 8
Dependent Claim
17 words
The key connection of claim 1 wherein the edges of said keyslots are smoothed out with fillets.
Claim 9
Dependent Claim
44 words
The key connection of claim 1 wherein the first and second connected components both have an equal number other than one of adjacently situated keyslots, each pair of said keyslots creating an opening with the helical spring-like key inserted in each of said openings.
Claim 10
Dependent Claim
19 words
The key connection of claim 1 wherein the internal volume of the spring-like key is filled with another body.
References Cited (Backward Citations)
CA484214A
Cited
US2210061A
Cited
US2332270A
Cited
US3024326A
Cited
US2884824A
Cited
US3250331A
Cited
US3421783A
Cited
US3464542A
Cited
DE2361817A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |