Patent US4419025A successfully refreshed from Google Patents.
US4419025A
Expired / Lapsed
US
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Locking device in a telescopic tubular tripod leg element assembly
Assignee: KENLOCK CORP
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Filing: 1982-02-24
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Granted: 1983-12-06
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Expires: 2002-02-24
Abstract
Abstract A locking device in a telescopic tripod leg element assembly for camera to fix an inner and an outer tubular leg elements in an extended position. A sleeve has at its one end an internal multiple thread and at the other end an inner peripheral face providing a guide face for the inner tubular leg element. The inner tubular leg element is provided at the inner end with an external multiple thread. The inner and outer tubular leg elements are locked in an extended position by engaging threadably the internal and external multiple threads with each other.
Inventors
- 👤 Shoichiro Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:40
CPC Classifications
F; F16; F16B; F16B7/00; F16B7/10; F16B7/105; F16M; F16M11/00; F16M11/20; F16M11/24; F16M11/26; F16M11/28; F16M11/32; F16M13/00; F16M2200/00; F16M2200/02; F16M2200/025; F16M2200/028; Y; Y10; Y10T; Y10T403/00; Y10T403/16; Y10T403/1616; Y10T403/1624; Y10T403/32; Y10T403/32254; Y10T403/32467; Y10T403/32475; Y10T403/32491
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A locking device in a telescopic tubular tripod leg element assembly comprising at least inner and outer tubular leg elements of circular cross-section, said locking device comprising a sleeve having at its one end an internal multiple thread and at the other end an inner peripheral face forming a guide face for said inner tubular leg element, said sleeve being fixedly secured to the inner peripheral face of said outer tubular leg element, said inner tubular leg element having an inner end portion with an enlarged diameter and an external multiple thread provided at the enlarged diameter of the inner end of said inner tubular leg element and adapted to be engaged by said internal multiple thread of said sleeve.
Claim 2
Dependent Claim
120 words
A locking device in a telescopic tubular tripod leg element assembly comprising at least inner and outer tubular leg elements of circular cross-section, said locking device comprising a sleeve having at its one end an internal multiple thread and at the other end an inner peripheral face forming a guide face for said inner tubular leg element, said sleeve being fixedly secured to the inner peripheral face of said outer tubular leg element, said inner tubular leg element having an inner end portion with an enlarged diameter and an external multiple thread provided at the enlarged diameter of the inner end of said inner tubular leg element and adapted to be engaged by said internal multiple thread of said sleeve.
Claim 3
Dependent Claim
60 words
A locking device as set forth in claim 1, wherein said sleeve is fixedly secured to the inner face at the other end of the outer tubular leg element said enlarged diameter comprises a bush having at its one end an external multiple thread, said bush being fixedly secured to the inner end portion of said inner tubular leg element.
Claim 4
Dependent Claim
26 words
A locking device as set forth in claim 1, wherein the axial effective length of said multiple thread portion is less than the lead of thread.
Claim 5
Dependent Claim
31 words
A locking device as set forth in claim 3, wherein the axial effective length of said multiple thread portion lies within a range of 1/2 to 1/4 the lead of thread.
Claim 6
Dependent Claim
24 words
A locking device as set forth in any of claims 1, 3 and 4, wherein said multiple thread is trapezoidal thread called "Helicoid thread".
Claim 7
Dependent Claim
31 words
A locking device as set forth in claim 1, wherein said multiple thread includes double or more thread, and preferably may be selected from a range of quadruplicate to octuple thread.
Claim 8
Dependent Claim
19 words
A locking device as set forth in claim 1, wherein said sleeve is made of high strength plastic material.
Claim 9
Dependent Claim
65 words
A locking device as set forth in claim 1, wherein a mark is applied on both the outer end portion of said inner tubular leg element and the end face of the sleeve to indicate an aligned position in which the inner multiple thread of said sleeve and the external multiple thread belonging to said inner tubular leg element start to mate with each other.
References Cited (Backward Citations)
US414903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |