Patent US2885596A successfully refreshed from Google Patents.
Patent US3865007A successfully refreshed from Google Patents.
US3865007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque determining allen screw
Assignee: Schneider Electric USA Inc
•
Filing: 1973-07-30
•
Granted: 1975-02-11
•
Expires: 1993-07-30
Abstract
Abstract The screw has a tool-receiving recess comprising a basically cylindrical outer recessed portion and a hexagonal inner recessed portion. The outer recessed portion has a plurality of nubs or protrusions spaced circumferentially around its cylindrical wall. A conventional hexagonal allen wrench inserted in the outer recessed portion is used to tighten the screw by engagement with the nubs. The nubs are designed so that they will be sheared by the wrench when a predetermined torque is exerted by the wrench. The screw can be loosened by the wrench when the wrench is received in the inner recessed portion. In one embodiment, the wrench can be inserted in the inner recessed portion before the nubs are sheared; in a second embodiment, shearing of the nubs is necessary before the wrench can be inserted in the inner recessed portion.
Inventors
- 👤 Harris I Stanback
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:51
CPC Classifications
H; H01; H01R; H01R4/00; H01R4/28; H01R4/30; H01R4/36; F; F16; F16B; F16B23/00; F16B23/0007; F16B31/00; F16B31/02; H01R11/00; H01R11/11; H01R11/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
A torque-determining socket head screw comprising an exteriorly threaded cylindrical body having a tool-receiving recess extending axially thereinto from one end face of the body, the recess having an outer basically cylindrical recess portion defining a cylindrical wall open to an adjacent coaxial inner recess portion having a plurality of angularly disposed flat sides, the inner recess portion having a transverse dimension smaller than the diameter of the outer recess and being designed to receive a standard size tool having angularly disposed sides so as to be complementary to the inner recess, and at least one frangible nub projecting radially inwardly from the cylindrical wall of the outer recess, the nub being engageable by the tool and shearable upon the application of a predetermined torque thereto by the tool thereby providing an indication that the screw when received in a threaded opening has been tightened to a predetermined torque value.
Claim 2
Dependent Claim
150 words
A torque-determining socket head screw comprising an exteriorly threaded cylindrical body having a tool-receiving recess extending axially thereinto from one end face of the body, the recess having an outer basically cylindrical recess portion defining a cylindrical wall open to an adjacent coaxial inner recess portion having a plurality of angularly disposed flat sides, the inner recess portion having a transverse dimension smaller than the diameter of the outer recess and being designed to receive a standard size tool having angularly disposed sides so as to be complementary to the inner recess, and at least one frangible nub projecting radially inwardly from the cylindrical wall of the outer recess, the nub being engageable by the tool and shearable upon the application of a predetermined torque thereto by the tool thereby providing an indication that the screw when received in a threaded opening has been tightened to a predetermined torque value.
Claim 3
Dependent Claim
24 words
A screw as claimed in claim 1 wherein there are additional nubs on the cylindrical wall, the nubs being circumferentially spaced from each other.
Claim 4
Dependent Claim
16 words
A screw as claimed in claim 2 wherein the nubs are generally triangular in radial cross-section.
Claim 5
Dependent Claim
30 words
A screw as claimed in claim 2 wherein the nubs extend axially inwardly from said one end face of the screw to an inner end of the cylindrical recess portion.
Claim 6
Dependent Claim
35 words
A screw as claimed in claim 2 wherein the inner recess portion has a plurality of vertices and, the nubs are displaced slightly circumferentially in the same direction from alternate ones of the vertices, respectively.
Claim 7
Dependent Claim
60 words
A screw as claimed in claim 2 wherein the inner recess portion has a plurality of vertices and the nubs are in substantial axial alignment with alternate ones of the vertices, respectively, said nubs extending radially inwardly beyond the vertices of the inner recess, thereby requiring shearing of the nubs before the tool can be advanced into the inner recess.
Claim 8
Dependent Claim
140 words
A torque determining allen head screw comprising an exteriorly threaded cylindrical body having a tool-receiving recess extending axially thereinto from one end face of the body, the recess having an outer basically cylindrical recess portion defining a cylindrical wall open to an adjacent coaxial inner hexagonal recess portion, the hexagonal recess having a transverse demension smaller than the diameter of the outer recess, the hexagonal recess portion being designed to receive a standard tool such as an allen wrench, and three frangible nubs circumferentially spaced on and projecting radially inwardly from the cylindrical wall of the outer recess, the nubs being engageable by an allen wrench and shearable upon the application of a predetermined torque thereto by the wrench thereby providing an indication that the screw when received in a threaded opening has been tightened to a predetermined torque value.
Claim 9
Dependent Claim
140 words
A torque determining allen head screw comprising an exteriorly threaded cylindrical body having a tool-receiving recess extending axially thereinto from one end face of the body, the recess having an outer basically cylindrical recess portion defining a cylindrical wall open to an adjacent coaxial inner hexagonal recess portion, the hexagonal recess having a transverse demension smaller than the diameter of the outer recess, the hexagonal recess portion being designed to receive a standard tool such as an allen wrench, and three frangible nubs circumferentially spaced on and projecting radially inwardly from the cylindrical wall of the outer recess, the nubs being engageable by an allen wrench and shearable upon the application of a predetermined torque thereto by the wrench thereby providing an indication that the screw when received in a threaded opening has been tightened to a predetermined torque value.
Claim 10
Dependent Claim
34 words
A screw as claimed in claim 7 wherein the inner hexagonal recess portion has six vertices and the nubs are displaced slightly circumferentially in the same direction from alternate ones of the vertices, respectively.
Claim 11
Dependent Claim
59 words
A screw as claimed in claim 7 wherein the inner hexagonal recess portion has six vertices and the nubs are positiOned in substantial axial alignment with alternate ones of the vertices, said nubs extending radially inwardly beyond the vertices of the inner recess, thereby requiring shearing of the nubs before the wrench can be advanced into the hexagonal recess.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |