US3922947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drop in anchor stud
Assignee: US EXPANSION BOLT COMPANY A CORP OF PA
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Filing: 1974-03-12
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Granted: 1975-12-02
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Expires: 1994-03-12
Abstract
Abstract The stud, pin or the like of this invention is used in a blind hole in masonry or similar material. It has a threaded upper end and some distance below the upper end the stud is necked down and garroted with a tapered, frusto conical portion below the neck for expanding a collar which surrounds the neck. The collar is a split ring which has to be compressed to fit into the hole, and upward pull on the stud causes the frusto conical portion to expand the stud and firmly secure it in the wall or other object in which the hole is located. The collar is shaped to prevent it from rotating in the hole.
Inventors
- 👤 Ignazio Leonardo
- 👤 Eugene Coll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:56
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/04; F16B13/06; F16B13/063; F16B13/065
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
299 words
An anchor stud assembly including in combination a stud comprising a mid-portion, a threaded upper end above the midportion, a lower portion that has a maximum diameter substantially equal to the diameter of the mid-portion and that has a frusto conical surface that tapers to a smaller diameter towards said mid-portion, a reduced diameter portion between the mid-portion and said frusto conical surface, a unitary collar of malleable metal extrudant extending circumferentially around the reduced diameter portion, a shoulder at the juncture of the midportion and the reduced diameter portion for holding the collar on the stud and for transmitting force to the collar when the stud is being tapped into a hole, the collar having a length as great as most of the length of the reduced diameter portion, and the collar having its outside surface formed with a plurality of longitudinally-extending ridges and grooves, all of which extend for the full length of the collar and each of which is of uniform cross-section for its full length, the portions of the collar at the bottoms of the grooves being thinner, in a radial direction, than the portions of the collar adjacent to the sides of the grooves and the grooves including one groove where the collar is thinner than at the other grooves and along which the collar breaks into two generally semi circular pieces as the collar is expanded by upward movement of the frusto conical portion with respect to the collar, and the thin portions at the bottoms of the other grooves providing areas of circumferential extent at which the malleable metal of the collar stretches as the collar is expanded by the frusto conical surface to increase the pressure of the collar against the side of a hole into which the stud is inserted.
Claim 2
Dependent Claim
299 words
An anchor stud assembly including in combination a stud comprising a mid-portion, a threaded upper end above the midportion, a lower portion that has a maximum diameter substantially equal to the diameter of the mid-portion and that has a frusto conical surface that tapers to a smaller diameter towards said mid-portion, a reduced diameter portion between the mid-portion and said frusto conical surface, a unitary collar of malleable metal extrudant extending circumferentially around the reduced diameter portion, a shoulder at the juncture of the midportion and the reduced diameter portion for holding the collar on the stud and for transmitting force to the collar when the stud is being tapped into a hole, the collar having a length as great as most of the length of the reduced diameter portion, and the collar having its outside surface formed with a plurality of longitudinally-extending ridges and grooves, all of which extend for the full length of the collar and each of which is of uniform cross-section for its full length, the portions of the collar at the bottoms of the grooves being thinner, in a radial direction, than the portions of the collar adjacent to the sides of the grooves and the grooves including one groove where the collar is thinner than at the other grooves and along which the collar breaks into two generally semi circular pieces as the collar is expanded by upward movement of the frusto conical portion with respect to the collar, and the thin portions at the bottoms of the other grooves providing areas of circumferential extent at which the malleable metal of the collar stretches as the collar is expanded by the frusto conical surface to increase the pressure of the collar against the side of a hole into which the stud is inserted.
Claim 3
Dependent Claim
218 words
The anchor stud assembly described in claim 1 characterized by the collar being of one piece construction and split so that its diameter can be changed by moving the edges of the split toward and from one another, the collar having longitudinally extending shoulders angularly spaced around the circumference of the collar and at which the thickness of the collar changes, the malleable metal of the collar having an unflexed diameter larger than the diameter of the stud and larger than the diameter of the hole in which the stud assembly is intended to be used, said collar being compressible to a smaller diameter which fits the hole into which the anchor stud assembly is inserted but the collar having sufficient resilience to expand and to bring longitudinally extending surfaces thereof into contact with the sides of the hole after the collar has been compressed so as to insert the anchor stud into the hole whereby the anchor stud has to be moved into the hole by force, such as transmitting force, to the top of the collar through said shoulder at the juncture of the mid-portion and the reduced diameter portion of the stud, by tapping the upper end of the stud to overcome the friction of said longitudinally extending surfaces against the sides of the hole.
Claim 4
Dependent Claim
56 words
The anchor stud assembly described in claim 1 characterized by the collar being a split ring with the thinner groove constituting a hinge portion of one piece construction with the rest of the collar and extending for the full longitudinal length of the collar, the collar being split on the side away from the hinge portion.
Claim 5
Dependent Claim
170 words
The anchor stud assembly described in claim 1 characterized by the collar having an original shape with generally semi-circular arc portions confronting one another on opposite sides of said thinner groove, said thinner groove comprising a hinge groove which is at a circumferential mid-portion between said arc portions, a part of the hinge groove constituting a section at which the collar can be bent to bring the arc portions closer together, the centers of curvature of the arc portions being originally spaced from one another, whereby the semi-circular arc portions are excentric with respect to the stud and with respect to one another, said centers of curvature being brought closer together as the collar is bent to bring the arc portions closer together for insertion of the collar into an opening in which the anchor stud is to be used, the material of the collar having sufficient resilience to spring outward into contact with the sides of the opening after being bent sufficiently to be inserted into the stud opening.
Claim 6
Dependent Claim
71 words
The anchor stud described in claim 4 characterized by the frusto conical portion of the stud having a part of its length with a radius of curvature greater than that of the original arc portions of the collar, and the collar being of material that bends to form itself around the tapered frusto conical portion of the stud as the stud is tightened in the opening in which it is used.
Claim 7
Dependent Claim
128 words
The anchor stud assembly described in claim 1 characterized by the collar being split at one side and having curved portions on both sides of the split and joined to one another on the side of the collar opposite the split, the inside faces of said curved portions being arcs of substantially uniform curvature throughout their axial length but having radii of curvature less than that of the confronting surface of the reduced diameter portion of the stud that confronts the collar when the stud is to be inserted in a hole, the curvature relationship giving the collar a generally oval shape surrounding a circular midportion for compression of the collar in the direction of its greatest extent when the stud is to be inserted into a hole.
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |