← Back to Patent Explorer
US4875266A Expired / Lapsed US ⏱️ 0.0 years remaining

Releasable high torque fastener

Assignee: Citicorp North America Inc
•
Filing: 1987-07-13
•
Granted: 1989-10-24
•
Expires: 2007-07-13
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract There is disclosed an easily releasable fastener which is specifically designed for high torque applications. The fastener comprises a slotted nut having at least two axial slots, and preferably no more than one of the slots extends completely through the body of the fastener. The slots divide the fastener into at least two segments which, in the preferred embodiment are retained together by the residual portions of the incomplete slots. Each of the segments has a flat surface for torque transmission and the assembly of segments is surrounded by a thin retainer band seated in an annular groove about the body of the fastener. The fastener is mounted within a retaining ring which has internal flats that coact with the flatted surfaces of the individual segments. The retaining ring has external wrenching flats to permit the application of the fastener to a standard bolt. The fastener is released by an extractor which has a cylindrical shroud to surround the retainer ring, with an annular lip at one end and a drive bolt at its opposite end. The annular lip of the shroud is placed beneath the annular edge of the retaining sleeve and the drive bolt is advanced against the upper surface of the segmented nut, thereby forcefully extracting the ring from the segmented nut and releasing the hoop tension about the nut, whereby the nut segments are spread outwardly, releasing the bolt tension.

Inventors

  • 👤 Ronald W. Batten

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 23:28
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/08; F16B37/0807; F16B37/0864; B; B25; B25B; B25B27/00; B25B27/02; B25B27/023; B25B27/14; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53796; Y10T29/53848; Y10T29/53857; Y10T29/53878

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 167 words
A releasable multiple part fastener which comprises: (a) a first part comprising an internally threaded slottede body having: (1) a base and at least one reduced diameter neck of a lesser diameter; (2) at least one axial slot extending axially through the body of said fastener and at least one additional axial slot extending substantially, but not entirely, through the body of said fastener, subdividing said body into at least two segments and (3) at least one, non-circular surfaced, torque transmitting external wall on each of said segments and b. a second part comprising a retainer ring surrounding said slotted body and having: (1) a first annular bottom recess in open communication with a second annular of reduced diameter recess of reduced diameter to receive said slotted body; and (2) a torque transmitting section comprising an internal wall with a non-circular surface of a contour to mate with the non-circular surfaced, torque transmitting external waall of each said fastener segment and in hoop stress bearing relationship thereto.
Claim 2
Dependent Claim 167 words
A releasable multiple part fastener which comprises: (a) a first part comprising an internally threaded slottede body having: (1) a base and at least one reduced diameter neck of a lesser diameter; (2) at least one axial slot extending axially through the body of said fastener and at least one additional axial slot extending substantially, but not entirely, through the body of said fastener, subdividing said body into at least two segments and (3) at least one, non-circular surfaced, torque transmitting external wall on each of said segments and b. a second part comprising a retainer ring surrounding said slotted body and having: (1) a first annular bottom recess in open communication with a second annular of reduced diameter recess of reduced diameter to receive said slotted body; and (2) a torque transmitting section comprising an internal wall with a non-circular surface of a contour to mate with the non-circular surfaced, torque transmitting external waall of each said fastener segment and in hoop stress bearing relationship thereto.
Claim 3
Dependent Claim 26 words
The fastener of claim 1 wherein said basae of said slotted body and said first annular bottom recess of said retaining ring have hexagonally flatted walls.
Claim 4
Dependent Claim 25 words
The fastener of claim 1 wherein said reduced diameter neck of said slotted body and second annular recess of said retainer have hexagonally flatted walls.
Claim 5
Dependent Claim 32 words
The fastener of claim 3 wherein an upper end of said reduced diameter neck has said hexagonally flatted walls, and including a cylindrical neck portion between said base and said uppe end.
Claim 6
Dependent Claim 17 words
The fastener of claim 4 including slotted body segment retainer means received abou said cylindrical neck portion.
Claim 7
Dependent Claim 31 words
The fastener of claim 5 including an annular groove extending abou said cylindrical neck portion said slotted body with an elastomeric ring seated therein and serving as said segment retainer means.
Claim 8
Dependent Claim 16 words
The fastener of claim 1 wherein face of said basae of said slotted body is bevelled.
Claim 9
Dependent Claim 36 words
The fastener of claim 7 in combination with a third part comprising a washer having a first flat face and an opposite outwardly bevelled end face to mate with the bevelled face of said slotted body.
Claim 10
Dependent Claim 31 words
The fastener of claim 8 wherein said washer has a cylindrical wall contiguous to the bevelled face, thereby raising said fastener a predetermined distance above a workpice secured with said fastener.
Claim 11
Dependent Claim 61 words
The releasable fastener of claim 1 in combination with a retainer retractor comprising: a. a sleeve body having: (1) an internal, annular lip abou its lower end; (2) a closed end face on its opposite end with a single internally threaded central bore; and (3) an open side wall; and b. an externally threaded drive rod received within said central bore.
Claim 12
Dependent Claim 26 words
The retainer retractor of claim 10 wherein said sleeve internally receives a segment guard having a cup shape which is removably attached to said drive rod.
Claim 13
Dependent Claim 20 words
The retainer retractor of claim 11 wherein said closed end face includes a central recess to receive said segment guard.

References Cited (Backward Citations)

US2133697A Cited
US2588372A Cited
US3200484A Cited
US3305921A Cited
US3858298A Cited
US4715756A Cited
US4659273A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-10-23 1993-04-24 1993-10-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-10-23 1997-04-24 1997-10-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-10-23 2001-04-24 2001-10-24 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag