Patent US5203418A successfully refreshed from Google Patents.
Patent US3877680A successfully refreshed from Google Patents.
US3877680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylinder synchronizer for drilling equipment
Assignee: Individual
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Filing: 1973-10-01
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Granted: 1975-04-15
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Expires: 1993-10-01
Abstract
Abstract A cylinder synchronizer is especially useful in drilling equipment having a main frame. A hook frame is mounted to rise and fall along a vertical center line relative to the main frame under the influence of a pair of vertically disposed, hydraulically interconnected cylinders. The plungers of the cylinders are each provided with one of a pair of pulleys over which flexible straps extend. One end of each strap is connected to the main frame while the other end of each strap passes over a respective one of the pulleys and at its other end is connected by connecting pins to one of a pair of spaced, selected points on the hook frame. The selected points are on opposite sides of the center of the hook frame and are at about the same elevation. On the hook frame is a hook support connected at a point substantially midway between the selected points and disposed at an elevation lower than that of the selected points.
Inventors
- 👤 Willard D Childs
- 👤 A Bruce Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:54
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/04; E; E21; E21B; E21B19/00; E21B19/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
161 words
A cylinder synchronizer for drilling equipment comprising a main frame, means for pendulously suspending said main frame, a hook frame, a pair of fluid motor cylinders mounted on said main frame with means for equalizing fluid pressures therein, a pair of plungers each reciprocably mounted in a respective one of said cylinders and extending upwardly therefrom, a pair of pulleys each rotatably mounted at the upper end of a respective one of said plungers, a pair of flexible straps each secured at one end to said main frame then passing over a respective one of said pulleys and at the other end disposed adjacent said hook frame, a pair of pivot pins each connecting said other ends of said straps to said hook frame at selected laterally spaced points on opposite sides of said hook frame for supporting a hook at a support point substantially midway between said selected points and at an elevation lower than that of said selected points.
Claim 2
Dependent Claim
161 words
A cylinder synchronizer for drilling equipment comprising a main frame, means for pendulously suspending said main frame, a hook frame, a pair of fluid motor cylinders mounted on said main frame with means for equalizing fluid pressures therein, a pair of plungers each reciprocably mounted in a respective one of said cylinders and extending upwardly therefrom, a pair of pulleys each rotatably mounted at the upper end of a respective one of said plungers, a pair of flexible straps each secured at one end to said main frame then passing over a respective one of said pulleys and at the other end disposed adjacent said hook frame, a pair of pivot pins each connecting said other ends of said straps to said hook frame at selected laterally spaced points on opposite sides of said hook frame for supporting a hook at a support point substantially midway between said selected points and at an elevation lower than that of said selected points.
Claim 3
Dependent Claim
151 words
A cylinder synchronizer for drilling equipment comprising a main frame, means for pendulously suspending said main frame, a hook frame having a vertical center line, a pair of interconnected hydraulic motor cylinders mounted on said main frame, a pair of plungers each reciprocably mounted in a respective one of said cylinders, a pair of flexible straps each having a portion extending substantially vertically from said main frame, means for moving each of said portions relative to said main frame in accordance with reciprocation of a respective one of said plungers, means for articulating each of said straps to a respective one of two selected points on said hook frame disposed on opposite sides of said center line at approximately the same elevation, and means on said hook frame for supporting a hook at a support point on said center line and at an elevation lower than that of said selected points.
Claim 4
Dependent Claim
151 words
A cylinder synchronizer for drilling equipment comprising a main frame, means for pendulously suspending said main frame, a hook frame having a vertical center line, a pair of interconnected hydraulic motor cylinders mounted on said main frame, a pair of plungers each reciprocably mounted in a respective one of said cylinders, a pair of flexible straps each having a portion extending substantially vertically from said main frame, means for moving each of said portions relative to said main frame in accordance with reciprocation of a respective one of said plungers, means for articulating each of said straps to a respective one of two selected points on said hook frame disposed on opposite sides of said center line at approximately the same elevation, and means on said hook frame for supporting a hook at a support point on said center line and at an elevation lower than that of said selected points.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |