US4076437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive cam lock for extension pole
Assignee: H AND G IND Inc
•
Filing: 1977-03-04
•
Granted: 1978-02-28
•
Expires: 1997-03-04
Abstract
Abstract A positive cam lock for a pair of telescoping extension poles. The cam support is mounted to the inner pole and carries a coaxially rotatably mounted idler cam and an eccentrically rotatably mounted locking cam. The outer pole has a number of inwardly extending splines which engage corresponding grooves on the locking and idler cams. When the outer pole is rotated, the eccentric cam will rotate and lock the outer pole at a desired axial position with respect to the inner pole while the idler cam prevents misalignment. A key mounted to the locking cam rides in a keyway on the cam support for preventing over-rotation of the locking cam.
Inventors
- 👤 Richard Mazzolla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:56
CPC Classifications
F; F16; F16B; F16B7/00; F16B7/10; F16B7/14; F16B7/1427; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32467; Y10T403/32475; Y10T403/32501; Y10T403/32532; Y10T403/32549; Y10T403/70; Y10T403/7009; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/2066; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A positive cam lock for inner and outer telescoping poles which are longitudinally adjustable along a longitudinal axis comprising a cam support mounted to one end of said inner pole, an idler cam mounted on said cam support for concentric rotation with respect to said inner and outer poles, a locking cam rotatably mounted on said cam support, said locking cam being eccentrically mounted with respect to the central longitudinal axis of said inner and outer poles, and positive engagement means acting between said outer pole and said idler cam and locking cam for simultaneous rotation of said idler and locking cams with said outer pole to cause said eccentrically mounted locking cam to engage the inner surface of the outer pole for locking the position of said inner pole with respect to said outer pole.
Claim 2
Dependent Claim
136 words
A positive cam lock for inner and outer telescoping poles which are longitudinally adjustable along a longitudinal axis comprising a cam support mounted to one end of said inner pole, an idler cam mounted on said cam support for concentric rotation with respect to said inner and outer poles, a locking cam rotatably mounted on said cam support, said locking cam being eccentrically mounted with respect to the central longitudinal axis of said inner and outer poles, and positive engagement means acting between said outer pole and said idler cam and locking cam for simultaneous rotation of said idler and locking cams with said outer pole to cause said eccentrically mounted locking cam to engage the inner surface of the outer pole for locking the position of said inner pole with respect to said outer pole.
Claim 3
Dependent Claim
31 words
A positive cam lock as claimed in claim 1, wherein said positive engagement means comprises splines extending longitudinally on said outer pole and engaging grooves on said idler and locking cams.
Claim 4
Dependent Claim
30 words
A positive cam lock as claimed in claim 1, and further including means acting between said locking cam and said cam support for limiting the rotation of said locking cam.
Claim 5
Dependent Claim
28 words
A positive cam lock as claimed in claim 3, wherein said limiting means comprises a key carried by said locking cam and a keyway on said cam support.
Claim 6
Dependent Claim
38 words
A positive cam lock as claimed in claim 1, and further including means acting between said locking cam and said cam support for permitting locking acton upon relative rotation of said telescoping poles in a single direction only.
References Cited (Backward Citations)
US689264A
Cited
US2432059A
Cited
US2873129A
Cited
US3259407A
Cited
US3419293A
Cited
US3515418A
Cited
US3897621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |