US3921947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable tripod
Assignee: Individual
•
Filing: 1974-09-24
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Granted: 1975-11-25
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Expires: 1994-09-24
Abstract
Abstract In a photographic tripod comprising a body member and at least three legs pivoted thereto, each leg has a cam member which cooperates with a centrally-disposed, vertically-movable common cam mounted above the body member to determine the maximum straddle of the legs and thus the height of the tripod, the weight of the tripod and a device supported thereby urging the leg cam members into engagement with the common cam member. The common cam member is mounted on a vertically-movable post which can be clamped at any position between two limit positions.
Inventors
- 👤 Alistair Peter Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:34
CPC Classifications
F; F16; F16M; F16M11/00; F16M11/20; F16M11/24; F16M11/242; F16M11/245; F16M11/02; F16M11/04; F16M11/06; F16M11/12; F16M11/14; F16M11/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
A tripod with an adjustable leg span comprising a body member, at least three legs pivoted to the body member about respective horizontal pivots, a common cam member having a cam face and mounted by the body member for movement above the body member along an axis that in operation of the tripod is at least substantially vertical, means for locking the cam member at any selected position along the said axis above the body member between two limit positions, and a leg cam member on each leg having a respective leg cam face extendable above the body member and engageable with the said common cam face to position the associated leg about the respective pivot axis and determine the maximum straddle of the legs, whereby the weight of the tripod and a device supported thereby will urge the leg cam faces into operative engagement with the common cam face.
Claim 2
Dependent Claim
150 words
A tripod with an adjustable leg span comprising a body member, at least three legs pivoted to the body member about respective horizontal pivots, a common cam member having a cam face and mounted by the body member for movement above the body member along an axis that in operation of the tripod is at least substantially vertical, means for locking the cam member at any selected position along the said axis above the body member between two limit positions, and a leg cam member on each leg having a respective leg cam face extendable above the body member and engageable with the said common cam face to position the associated leg about the respective pivot axis and determine the maximum straddle of the legs, whereby the weight of the tripod and a device supported thereby will urge the leg cam faces into operative engagement with the common cam face.
Claim 3
Dependent Claim
31 words
The invention as claimed in claim 1, wherein the said common cam member mounted above the body member is constituted by a circular disc having its centre on the said axis.
Claim 4
Dependent Claim
62 words
The invention as claimed in claim 2, wherein means mounting the disc common cam member comprise a shaft to which the disc is attacheD mounted in a corresponding bore in the body member for movement along the said axis, and the means for locking the cam member at any selected position comprise a locking screw in the body member engaging the shaft.
Claim 5
Dependent Claim
43 words
The invention as claimed in claim 1, wherein each leg cam member comprises means mounting the respective leg to the body member, each leg cam member being pivoted to the body member and each leg being fixed to the respective leg cam member.
Claim 6
Dependent Claim
23 words
The invention as claimed in claim 2, wherein the disc common cam member also constitutes means for mounting a device on the tripod.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |