US3874423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring base and method of forming same
Assignee: Leggett and Platt Inc
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Filing: 1973-07-12
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Granted: 1975-04-01
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Expires: 1993-07-12
Abstract
Abstract A spring base and method of forming same, the spring base comprising an intersecting grid-like array of transversely and longitudinally extending metallic rods, welded to one another at mutually intersecting portions, and a plurality of springs connected to the grid-like array. Each of the springs is provided with a closed, generally circular end portion, which is wedged and restrained against lateral displacement by a pair of longitudinally extending metallic rods biasing thereagainst in one direction and an associated pair of transversely extending metallic rods biasing thereagainst in a generally opposite direction.
Inventors
- 👤 Sam Larkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:40
CPC Classifications
B; B21; B21F; B21F27/00; B21F27/12; B21F27/16; A; A47; A47C; A47C27/00; A47C27/04; A47C27/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49838
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
289 words
A method of forming a spring base comprising the steps of: securing a plurality of first rod-like members in a spacedapart, longitudinally extending arrangement; forming one end of each spring of a plurality of springs with a closed loop of greater lateral extent than the spacing between associated members of said first rod-like members; abutting upper portions of each closed loop against under surfaces of said associated members of said first rod-like members; abutting upper surfaces of a plurality of second rod-like members against lower portions of each closed loop with said second rod-like members being placed in a spaced-apart, transversely extending arrangement where said closed loop of each of said springs is of greater lateral extent than the spacing between associated members of said second rod-like members; positioning portions of said upper surfaces of said associated members of said second rod-like members against portions of said under surfaces of said associated members of said first rod-like members to define an intersecting grid-like array with said springs being operatively associated with respective openings in said grid-like array, said respective openings each being defined by a respective pair of said associated members of said first rod-like members and a respective pair of said associated members of said second rod-like members; and securing each of said portions of said first and second rod-like members to one another respectively at mutually intersecting positions for biasing said first rod-like members against said upper portions of each closed loop in one direction and for biasing said second rod-like members against said lower portions of each closed loop in an opposite direction to monolithically wedge and restrain said closed loops of said springs against dislodgement from being sandwiched between said first and second rod-like members.
Claim 2
Independent Claim
289 words
A method of forming a spring base comprising the steps of: securing a plurality of first rod-like members in a spacedapart, longitudinally extending arrangement; forming one end of each spring of a plurality of springs with a closed loop of greater lateral extent than the spacing between associated members of said first rod-like members; abutting upper portions of each closed loop against under surfaces of said associated members of said first rod-like members; abutting upper surfaces of a plurality of second rod-like members against lower portions of each closed loop with said second rod-like members being placed in a spaced-apart, transversely extending arrangement where said closed loop of each of said springs is of greater lateral extent than the spacing between associated members of said second rod-like members; positioning portions of said upper surfaces of said associated members of said second rod-like members against portions of said under surfaces of said associated members of said first rod-like members to define an intersecting grid-like array with said springs being operatively associated with respective openings in said grid-like array, said respective openings each being defined by a respective pair of said associated members of said first rod-like members and a respective pair of said associated members of said second rod-like members; and securing each of said portions of said first and second rod-like members to one another respectively at mutually intersecting positions for biasing said first rod-like members against said upper portions of each closed loop in one direction and for biasing said second rod-like members against said lower portions of each closed loop in an opposite direction to monolithically wedge and restrain said closed loops of said springs against dislodgement from being sandwiched between said first and second rod-like members.
Claim 3
Dependent Claim
38 words
A method as claimed in claim 1 wherein the step of securing each of said portions comprises welding each of said portions of said first and second rod-like members to one another respectively at said mutually intersecting positions.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |