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US4793752A
Expired / Lapsed
US
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Drive-head lock washer
Assignee: PERMA TITE AB
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Filing: 1987-05-11
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Granted: 1988-12-27
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Expires: 2007-05-11
Abstract
Abstract There is provided a flanged drive-head lock washer for use in combination with a wedge-action-type fastener, wherein the fastener includes a bolt or screw member having a cam nut or cam head. The flanged drive-head washer is formed having a nut-like body and a plurality of wrench-engaging sides to match the sides of the particular nut or head of a bolt. The upper face of the washer comprises a plurality of cam members arranged to lockingly engage the corresponding cam surface formed on the contacting surface of the cam nut or cam head. The lower surface of the washer is formed having a frictional surface defined by an enlarged annular flange. The matching cam surfaces are arranged to align the corresponding wrench-engaging side walls, whereby the cam nut or cam head can be simultaneously rotated during removal of the fastener without affecting the integrity of the fastener.
Inventors
- 👤 Bengt O. Frieberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:58
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/282; F16B39/24; F16B23/00; F16B43/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
190 words
A wedge-action lock washer in combination with a threaded fastener, comprising: a fastener means having a threaded stud member, a fastener head formed at one end thereof, and a nut adapted to be threaded to said stud member, said fastener-head and said nut being formed having a plurality of wrench-engageable vertical side surfaces, wherein one surface of said nut includes a plurality of contiguous cam members; a one-piece wedge-action lock washer having a first body portion and an integrally formed second body portion, each of said body portions having a center bore disposed therethrough; said first body portion being formed to define a drive head having a plurality of contiguous cam members adapted to engage said cam members of said nut in a locking arrangement under force, and a plurality of wrench-engageable vertical side surfaces being formed to match and be aligned with said vertical side surfaces of said nut thereof; and said second body portion being defined by an enlarged radially extending flange member, said flange member having a substantially flat frictional engaging surface adapted to engage the surface of a workpiece to which is secured said threaded fastener.
Claim 2
Dependent Claim
190 words
A wedge-action lock washer in combination with a threaded fastener, comprising: a fastener means having a threaded stud member, a fastener head formed at one end thereof, and a nut adapted to be threaded to said stud member, said fastener-head and said nut being formed having a plurality of wrench-engageable vertical side surfaces, wherein one surface of said nut includes a plurality of contiguous cam members; a one-piece wedge-action lock washer having a first body portion and an integrally formed second body portion, each of said body portions having a center bore disposed therethrough; said first body portion being formed to define a drive head having a plurality of contiguous cam members adapted to engage said cam members of said nut in a locking arrangement under force, and a plurality of wrench-engageable vertical side surfaces being formed to match and be aligned with said vertical side surfaces of said nut thereof; and said second body portion being defined by an enlarged radially extending flange member, said flange member having a substantially flat frictional engaging surface adapted to engage the surface of a workpiece to which is secured said threaded fastener.
Claim 3
Dependent Claim
30 words
The combination as recited in claim 1, wherein said flange member includes a frictional-engaging ring member defined by a central recess formed in the undersurface of said second body portion.
Claim 4
Dependent Claim
42 words
The combination as recited in claim 2, wherein said cam members of said nut and said cam members of said drive head, are respectively disposed so as to engage each other, thereby establishing a juxtaposed alignment of said vertical side surfaces thereof.
Claim 5
Dependent Claim
51 words
The combination as recited in claim 3, including a socket wrench having a vertical engaging inner side surface adapted to be received over both said fastener head or nut, and said drive head of said lock washer, whereby said lock washer can be rotated simultaneously with said nut of said fastener.
Claim 6
Dependent Claim
28 words
The combination as recited in claim 3, wherein the engaging surface of said friction ring of said flange member is selectively determined by the diameter of said recess.
Claim 7
Dependent Claim
23 words
The combination as recited in claim 5, wherein said recess is formed having a diameter greater than the width of said drive head.
Claim 8
Dependent Claim
23 words
The combination as recited in claim 5, wherein said recess is formed having a diameter equal to the width of said drive head.
Claim 9
Dependent Claim
23 words
The combination as recited in claim 5, wherein said recess is formed having a diameter less than the width of said drive head.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-27 | 1992-06-27 | 1992-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-27 | 1996-06-27 | 1996-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-27 | 2000-06-27 | 2000-12-27 | $7700.00 | Window Closed / Lapsed |