US4131031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-backlash nut assembly
Assignee: Kerk Motion Products Inc
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Filing: 1977-07-19
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Granted: 1978-12-26
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Expires: 1997-07-19
Abstract
Abstract An anti-backlash nut assembly is disclosed of the type which undergoes translational movement along a screw in response to relative rotational movement between the nut and screw. The assembly includes a nut which is axially-split into first and second portions, both of which have an internal thread complementary to the external thread of the screw. The two portions of the axially-split nut are retained in the radial direction by a spacer, and a spring is used to apply biasing in the longitudinal direction to minimize backlash.
Inventors
- 👤 Kenneth W. Erikson
- 👤 Keith W. Erikson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:23
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/2003; F16H25/2006; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49462; Y10T29/49467; Y10T29/49469; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18728; Y10T74/19; Y10T74/19623; Y10T74/1987; Y10T74/19893; Y10T74/19898; Y10T74/19902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
An anti-backlash nut assembly designed to undergo translational movement along a screw having an external thread thereon in response to relative rotational movement between the nut assembly and screw, comprising, in combination: a. a first portion of an axially-split nut having an internal thread complementary to the external thread of said screw; b. a second portion of said axially-split nut, said second portion also having an internal thread complementary to the external thread of said screw; c. means for retaining said first portion and said second portion of the axially-split nut in an aligned position around said screw whereby their internal threads engage the external threads of said screw; and, d. means for biasing said first portion and said second portion of the axially-split nut in opposite longitudinal directions.
Claim 2
Dependent Claim
129 words
An anti-backlash nut assembly designed to undergo translational movement along a screw having an external thread thereon in response to relative rotational movement between the nut assembly and screw, comprising, in combination: a. a first portion of an axially-split nut having an internal thread complementary to the external thread of said screw; b. a second portion of said axially-split nut, said second portion also having an internal thread complementary to the external thread of said screw; c. means for retaining said first portion and said second portion of the axially-split nut in an aligned position around said screw whereby their internal threads engage the external threads of said screw; and, d. means for biasing said first portion and said second portion of the axially-split nut in opposite longitudinal directions.
Claim 3
Dependent Claim
30 words
An anti-backlash nut assembly of claim 1 wherein said means for retaining comprises a hollow, cylindrical spacer positioned around said first portion and said second portion of the axially-split nut.
Claim 4
Dependent Claim
24 words
An anti-backlash nut assembly of claim 2 wherein said means for biasing comprise and open wound helical spring positioned around said hollow cylindrical spacer.
Claim 5
Dependent Claim
32 words
An anti-backlash nut assembly of claim 3 wherein said first portion of the axially-split nut is integrally joined to a tubular member providing a shoulder for restraining one end of said spring.
Claim 6
Dependent Claim
27 words
An anti-backlash nut assembly of claim 4 wherein said second portion of said axially-split nut has a raised shoulder for restraining the other end of said spring.
Claim 7
Dependent Claim
14 words
An anti-backlash nut assembly of claim 5 also including at least one radial flexure.
Claim 8
Dependent Claim
24 words
An anti-backlash nut assembly of claim 1 wherein said first portion and said second portion are molded from a low friction, self-lubricating polymer composition.
Claim 9
Dependent Claim
24 words
An anti-backlash nut assembly of claim 5 wherein said first portion and said second portion are molded from a low friction, self-lubricating polymer composition.
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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |