US3871193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring load system for drill string shock absorbers
Assignee: Dresser Industries Inc
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Filing: 1973-12-12
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Granted: 1975-03-18
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Expires: 1993-12-12
Abstract
Abstract A shock absorbing torque transmitting well tool is disclosed that includes an outer member and an inner member telescopically arranged. A spline means between said outer member and said inner member transmits torque. A spring means is positioned between the outer member and the inner member. The spring means includes a multiplicity of spring segments arranged in discrete spring units having different spring rates. The spring means will accommodate a wide range of loads or rapidly varying load situations. The tool operates effectively in holes started from the surface with very little weight on the bit and continues to operate effectively as the weight on the bit is increased.
Inventors
- 👤 James Whitehurst Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:08
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
98 words
A shock absorbing torque transmitting well tool, comprising: an outer member; an inner member, said outer member and said inner member being telescopically arranged; spline means between said outer member and said inner member for transmitting torque; and spring means connected to said outer member and connected to said inner member, said spring means including a first spring unit with a first spring constant and a second spring unit with a second and different spring constant said first spring unit and said second spring unit including a multiplicity of disc springs positioned between said inner and outer members.
Claim 2
Dependent Claim
98 words
A shock absorbing torque transmitting well tool, comprising: an outer member; an inner member, said outer member and said inner member being telescopically arranged; spline means between said outer member and said inner member for transmitting torque; and spring means connected to said outer member and connected to said inner member, said spring means including a first spring unit with a first spring constant and a second spring unit with a second and different spring constant said first spring unit and said second spring unit including a multiplicity of disc springs positioned between said inner and outer members.
Claim 3
Dependent Claim
18 words
The shock absorbing torque transmitting well tool of claim 1 including stop elements connected to said disc springs.
Claim 4
Dependent Claim
22 words
The shock absorbing torque transmitting well tool of claim 2 wherein the stop elements are annular elements positioned between matching disc elements.
Claim 5
Dependent Claim
38 words
The shock absorbing torque transmitting well tool of claim 3 including oil positioned between said inner and outer member wherein the clearance between said disc springs and said inner and outer members restricts the passage of said oil.
Claim 6
Dependent Claim
81 words
A shock absorbing torque transmitting well tool, comprising: an outer member; an inner member, said outer member and said inner member being telescopically arranged; spline means between said outer member and said inner member for transmitting torque; and spring means connected with said outer member and connected with said inner member, said spring means including a first spring unit with a multiplicity of disc spring elements and a second spring unit with a second and different multiplicity of disc spring elements.
Claim 7
Dependent Claim
81 words
A shock absorbing torque transmitting well tool, comprising: an outer member; an inner member, said outer member and said inner member being telescopically arranged; spline means between said outer member and said inner member for transmitting torque; and spring means connected with said outer member and connected with said inner member, said spring means including a first spring unit with a multiplicity of disc spring elements and a second spring unit with a second and different multiplicity of disc spring elements.
Claim 8
Dependent Claim
41 words
The shock absorbing torque transmitting well tool of claim 5 including a fluid between said inner member and said outer member with the disc spring elements positioned between said inner member and said outer member to restrict passage of said fluid.
Claim 9
Dependent Claim
19 words
The shock absorbing torque transmitting well tool of claim 6 including stop elements positioned within said disc spring elements.
Claim 10
Dependent Claim
126 words
A shock absorbing torque transmitting well tool, comprising: an outer member; an inner member, said outer member and said inner member being telescopically arranged; an upper seal between said outer member and said inner member; a lower seal between said outer member and said inner member; a fluid between said upper seal and said lower seal; spline means between said outer member and said inner member for transmitting torque; and spring means connected with said outer member and connected with said inner member with said spring means including a first multiplicity of disc spring units and a second multiplicity of disc spring units, said first multiplicity of disc spring units being a different number of disc spring units than said second multiplicity of disc spring units.
Claim 11
Dependent Claim
126 words
A shock absorbing torque transmitting well tool, comprising: an outer member; an inner member, said outer member and said inner member being telescopically arranged; an upper seal between said outer member and said inner member; a lower seal between said outer member and said inner member; a fluid between said upper seal and said lower seal; spline means between said outer member and said inner member for transmitting torque; and spring means connected with said outer member and connected with said inner member with said spring means including a first multiplicity of disc spring units and a second multiplicity of disc spring units, said first multiplicity of disc spring units being a different number of disc spring units than said second multiplicity of disc spring units.
Claim 12
Dependent Claim
36 words
The shock absorbing torque transmitting well tool of claim 8 wherein said first and second multiplicity of disc spring units are positioned between said outer member and said inner member to restrict passage of said fluid.
Claim 13
Dependent Claim
18 words
The shock absorbing torque transmitting well tool of claim 9 including stop elements within said disc spring units.
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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 |