US3871205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for length stabilization of a cable
Assignee: Associated Materials LLC
•
Filing: 1973-05-21
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Granted: 1975-03-18
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Expires: 1993-05-21
Abstract
Abstract Apparatus for the length stabilization of armored well logging cable. The cable is passed from a payoff reel over hold back sheaves, a series of fixed sheaves, a movable sheave, and haul off sheaves to a take-up reel. A hydraulic system controls the movable sheave to place the cable under tension. A second hydraulic system cyclically varies the effect of the hold back sheaves to vary the cable tension.
Inventors
- 👤 G Donald Fenton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:41
CPC Classifications
D; D07; D07B; D07B5/00; D07B5/12; B; B21; B21F; B21F9/00; C; C21; C21D; C21D8/00; C21D8/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
In an apparatus for length stabilizing a length of cable which apparatus comprises a pair of hold-back sheaves for providing a braking effect, a pair of pulling sheaves, means for driving said pulling sheaves, a series of intermediate sheaves between said hold-back sheaves and said pulling sheaves, said sheaves defining a path through which a cable may travel through the apparatus and one of said intermediate sheaves being mounted for applying tension to the cable between the hold-back sheaves and the pulling sheaves, the combination therewith of means connected to said hold-back sheaves for alternately increasing and decreasing the braking effect of said hold-back sheaves between a maximum level and a minimum level in timed cycles and means connected to one of said intermediate sheaves for applying tension and responsive to said change in braking effect for tensioning said cable between maximum and minimum levels whereby each increment of cable length is tensioned through a multiplicity of cycles.
Claim 2
Dependent Claim
158 words
In an apparatus for length stabilizing a length of cable which apparatus comprises a pair of hold-back sheaves for providing a braking effect, a pair of pulling sheaves, means for driving said pulling sheaves, a series of intermediate sheaves between said hold-back sheaves and said pulling sheaves, said sheaves defining a path through which a cable may travel through the apparatus and one of said intermediate sheaves being mounted for applying tension to the cable between the hold-back sheaves and the pulling sheaves, the combination therewith of means connected to said hold-back sheaves for alternately increasing and decreasing the braking effect of said hold-back sheaves between a maximum level and a minimum level in timed cycles and means connected to one of said intermediate sheaves for applying tension and responsive to said change in braking effect for tensioning said cable between maximum and minimum levels whereby each increment of cable length is tensioned through a multiplicity of cycles.
Claim 3
Dependent Claim
47 words
Apparatus according to claim 1 in which said means for alternately increasing and decreasing the braking effect includes a hydraulic system connected to act as a brake on said hold-back sheaves and a cycling valve connected in said system for cyclically changing the pressure in said system.
Claim 4
Dependent Claim
117 words
Apparatus according to claim 2 in which said means connected to the sheave for applying tension includes a first supply tank, a first hydraulic pump connected to said supply tank, a first relief valve connected to said first hydraulic pump, a hydraulic cylinder connected to said pump and having a piston connected to said tensioning sheave and mounted for movement in said cylinder, a four-way valve connected to said hydraulic cylinder, said first supply tank and said first relief valve, a potentiometer mounted to be set by movement of said piston, a control valve actuated by said potentiometer and connected between said first supply tank and the connection between the first relief valve and the four-way valve.
Claim 5
Dependent Claim
73 words
Apparatus according to claim 3 in which said hydraulic system includes a second supply tank, a second hydraulic pump connected to said second supply tank and driven by rotational movement of said Hold-back sheaves, a second relief valve connected to said second pump for providing said braking effect, and in which said cycling valve is connected to said second relief valve for cyclically by-passing said second relief valve thereby changing the braking effect.
Claim 6
Dependent Claim
41 words
Apparatus according to claim 4 which includes a cam, a gear motor connected to said cam for rotating the cam and a cam follower on said cycling valve adapted to set the position of said cycling valve as said cam rotates.
Claim 7
Dependent Claim
28 words
Apparatus according to claim 1 which includes means for applying heat to that part of said cable between a pair of sheaves in said series of intermediate sheaves.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |