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US3799229A
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Locking thread fastener
Assignee: GALT CRAFTED PRODUCTS Inc 4500 KISHWAUKEE STR ROCKLAND IL 61109 A DE CORP
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Filing: 1971-10-26
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Granted: 1974-03-26
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Expires: 1991-10-26
Abstract
Abstract A locking thread fastener for use in a mating part having a conventional internal thread where the thread of the fastener has a varying pitch distance along the length of the screw so that interference is encountered on the flanks of the thread when the fastener is driven into the mating part. The pitch distance varies in an oscillating manner between maximum and minimum values.
Inventors
- 👤 L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:13
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/30; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A locking thread fastener having a standard helical thread form adapted for assembly with a mating part having a complementary standard internal thread, comprising a fastener shank having a driving head at one end and an opposite free end and having a thread formed thereon with a constant root diameter and a constant crest diameter, the thread on the fastener having at least a portion formed as a locking thread with a variable pitch, the locking thread portion including at least three thread turns with the pitch measured between any two points on adjacent turns thereof being varied from thread to thread and oscillating in a range between maximum and minimum values along the length of the locking thread portion.
Claim 2
Dependent Claim
120 words
A locking thread fastener having a standard helical thread form adapted for assembly with a mating part having a complementary standard internal thread, comprising a fastener shank having a driving head at one end and an opposite free end and having a thread formed thereon with a constant root diameter and a constant crest diameter, the thread on the fastener having at least a portion formed as a locking thread with a variable pitch, the locking thread portion including at least three thread turns with the pitch measured between any two points on adjacent turns thereof being varied from thread to thread and oscillating in a range between maximum and minimum values along the length of the locking thread portion.
Claim 3
Dependent Claim
31 words
A locking thread fastener as set forth in claim 1, in which the pitch of the locking threads decreases and increases in a constant increment for each turn of the thread.
Claim 4
Dependent Claim
35 words
A locking thread fastener as set forth in claim 1, in which the locking action of the fastener in the mating part occurs along the flanks of the locking screw threads of the assembled parts.
Claim 5
Dependent Claim
46 words
A locking thread fastener as set forth in claim 1, in which the variable pitch decreases from the normal thread pitch for at least two revolutions of the fastener thread and then returns to the normal pitch over at least two revolutions of the fastener thread.
Claim 6
Dependent Claim
51 words
A locking thread fastener as set forth in claim 4, in which the locking thread pitch decreases by equal increments per revolution over three revolutions of the fastener thread and then increases at the same equal increments per revolution over the succeeding three revolutions to return to the normal thread pitch.
Claim 7
Dependent Claim
44 words
A locking thread fastener as set forth in claim 5, in which the locking thread remains at the normal thread pitch for two revolutions before decreasing for the next cycle and is at the minimum pitch for only one revolution of the locking thread.
Claim 8
Dependent Claim
91 words
A locking thread fastener as set forth in claim 1, in which the pitch of the locking threads decreases and increases in a constant increment per revolution of the thread, the pitch initially being at its normal value for the initial two thread revolutions, then decreases over three revolutions to its minimum value and then increases over three revolutions to the normal pitch value, the thread remaining at its minimum value for a single revolution and at its maximum normal value for two revolutions before decreasing again in the next cycle.
Claim 9
Dependent Claim
32 words
A locking thread fastener as set forth in claim 7, in which thread interference causing locking action between the fastener and its mating part occurs along the flanks of the locking threads.
Claim 10
Dependent Claim
26 words
A locking thread fastener as set forth in claim 1, in which said fastener shank includes a tapered free end having threads with flattened crests thereon.
Claim 11
Dependent Claim
24 words
A locking thread fastener as set forth in claim 1, in which the locking thread extends along the entire length of the fastener shank.
Claim 12
Dependent Claim
35 words
A locking thread fastener as set forth in claim 1, in which the locking thread extends along a portion of the fastener shank and a standard screw thread extends along the remainder of the shank.
Claim 13
Dependent Claim
38 words
A locking thread fastener as set forth in claim 11, in which the locking thread portion is formed adjacent a driving head for the fastener and extends for approximately one-third to one-half of the length of the shank.
Claim 14
Dependent Claim
44 words
A locking thread fastener as set forth in claim 11, in which the locking thread portion extends for approximately one-third to one-half the length of the shank intermediate the ends of the fastener with a standard screw thread at the ends of the fastener.
Claim 15
Dependent Claim
46 words
A locking thread fastener as set forth in claim 11, in which the locking thread portion extends for approximately one-third to one-half the length of the shank at the free end thereof with a standard thread extending from the locking thread portion to the driving head.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |