Patent US3566947A successfully refreshed from Google Patents.
US3566947A
Expired / Lapsed
US
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Self-locking threaded insert
Assignee: Calgon Corp
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Filing: 1969-04-29
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Granted: 1971-03-02
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Expires: 1989-04-29
Abstract
Abstract A thin walled tubular metal insert having a threaded exterior is threaded into a tapped hole in a base member by a tool partially threaded into the interior of the insert. With the insert fully in place, further rotation of the tool completes the threads on a portion of the interior of the insert, thus bulging the insert walls outwardly to lock the insert in the tapped hole.
Inventors
- 👤 John A Jukes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:53
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/12; F16B37/122; F16B39/00; F16B39/22; F16B39/28; F16B39/30; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929; Y10S411/938; Y10S411/955; Y10S411/965; Y10S411/967; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
A self-locking thin walled insert made of a relatively hard material such as stainless steel for installation into a base member made of a material which is somewhat softer than the insert such as aluminum, such insert having a generally tubular shape with an upper portion being outwardly flared on its exterior and having an exterior thread of uniform major and minor diameter throughout extending downwardly from the flared portion, the interior of the insert having a uniform thread substantially timed with said exterior thread except that a small portion of the interior has an incomplete thread defining an internally thickened portion, the wall of the incompletely threaded portion being sufficiently thin such that the incomplete portion can be completed when installed by a threaded tool in a tapped opening and the incomplete portion of the insert will be urged outwardly to secure the insert in the opening.
Claim 2
Dependent Claim
148 words
A self-locking thin walled insert made of a relatively hard material such as stainless steel for installation into a base member made of a material which is somewhat softer than the insert such as aluminum, such insert having a generally tubular shape with an upper portion being outwardly flared on its exterior and having an exterior thread of uniform major and minor diameter throughout extending downwardly from the flared portion, the interior of the insert having a uniform thread substantially timed with said exterior thread except that a small portion of the interior has an incomplete thread defining an internally thickened portion, the wall of the incompletely threaded portion being sufficiently thin such that the incomplete portion can be completed when installed by a threaded tool in a tapped opening and the incomplete portion of the insert will be urged outwardly to secure the insert in the opening.
Claim 3
Dependent Claim
50 words
The insert of claim 1 wherein the incompletely threaded portion is located at the end of the insert spaced opposite from said flared portion and the axial length of the incomplete portion is equal to no more than the axial length of two or three turns of the interior thread.
Claim 4
Dependent Claim
40 words
The insert of claim 1 wherein the minor diameter of the exterior thread is in a range extending from slightly smaller than the major diameter of the interior thread to slightly larger than the major diameter of the interior thread.
Claim 5
Dependent Claim
52 words
The insert of claim 3 wherein the wall of the incompletely threaded portion, extending from its inner minor diameter to the major diameter of the exterior thread is approximately equal to the distance between the minor diameter of the complete and uniform inner thread and the major diameter of the exterior thread.
Claim 6
Dependent Claim
159 words
A self-locking thin walled metal insert having a generally tubular shape with an upper portion being outwardly flared on its exterior and having a threaded exterior extending downwardly from the flared portion, the interior of the insert having a thread timed with the exterior thread except that a small portion of the interior has an incomplete thread or is completely unthreaded defining an internally thickened portion, the minor diameter of the external thread being smaller than the major diameter of the complete internal thread, and the internal major diameter of said incomplete portion being about equal to or only slightly larger than the minor diameter of the complete internal threads so that the incomplete portion can be completed when installed by a threaded tool into a tapped opening in a base member made of material softer than the insert causing the incomplete portion of the insert to be urged outwardly to thereby secure the insert in the tapped opening.
Claim 7
Dependent Claim
159 words
A self-locking thin walled metal insert having a generally tubular shape with an upper portion being outwardly flared on its exterior and having a threaded exterior extending downwardly from the flared portion, the interior of the insert having a thread timed with the exterior thread except that a small portion of the interior has an incomplete thread or is completely unthreaded defining an internally thickened portion, the minor diameter of the external thread being smaller than the major diameter of the complete internal thread, and the internal major diameter of said incomplete portion being about equal to or only slightly larger than the minor diameter of the complete internal threads so that the incomplete portion can be completed when installed by a threaded tool into a tapped opening in a base member made of material softer than the insert causing the incomplete portion of the insert to be urged outwardly to thereby secure the insert in the tapped opening.
Claim 8
Dependent Claim
52 words
The insert of claim 5 wherein the crests of the turns of said exterior thread surrounding said interior incomplete portion are formed with a plurality of spaced notches which create a series of sharp corners that bite slightly into the surrounding base material as the thread on said incomplete portion is completed.
Claim 9
Independent Claim
173 words
A method of strengthening the threads of a tapped hole comprising the steps of: threading a thin walled tubular insert into the exterior of a threaded member which is harder than said tubular insert, the insert having on its interior a completely threaded portion and an incompletely threaded portion defining an internally thickened portion, said insert being initially threaded onto the threaded member no further than where it can be easily turned; threading the insert into the tapped hole of a base member softer than said tubular insert to a point where it can be threaded no further because of interference between the insert and the base member; and forcibly turning said threaded member further into the insert so as to complete the thread on said incompletely threaded portion of the insert and also to cause the exterior of the thin walled insert surrounding the interior newly threaded portion to be urged outwardly so as to lock frictionally the insert in the base member, thus enabling the threaded member to be easily withdrawn.
Claim 10
Independent Claim
173 words
A method of strengthening the threads of a tapped hole comprising the steps of: threading a thin walled tubular insert into the exterior of a threaded member which is harder than said tubular insert, the insert having on its interior a completely threaded portion and an incompletely threaded portion defining an internally thickened portion, said insert being initially threaded onto the threaded member no further than where it can be easily turned; threading the insert into the tapped hole of a base member softer than said tubular insert to a point where it can be threaded no further because of interference between the insert and the base member; and forcibly turning said threaded member further into the insert so as to complete the thread on said incompletely threaded portion of the insert and also to cause the exterior of the thin walled insert surrounding the interior newly threaded portion to be urged outwardly so as to lock frictionally the insert in the base member, thus enabling the threaded member to be easily withdrawn.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |