US3690387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boom rotation brake release means for derricks
Assignee: R H BOULIGNY Inc
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Filing: 1971-02-16
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Granted: 1972-09-12
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Expires: 1991-02-16
Abstract
Abstract A derrick having boom rotation brake release means operable to allow the boom to be rotated by side loading above a predetermined magnitude and thereby relieve the extent of side loading so as to avoid damage to the derrick. The boom is rotated by a hydraulic motor with which is associated a double relief valve that allows reverse operation of the motor as an idler pump while imposing a limited resistance to rotation. The brake release means is hydraulically operated to release a brake mechanism that normally prevents boom rotation, with the brake release means being connected in the hydraulic system of the derrick for operation to release the brake mechanism in response to an increase in the hydraulic pressure in the system occurring during operation of the rotation motor and also during operation of other hydraulically operated derrick functions to allow the boom to rotate during operation of the rotation motor and to be rotated by side loading during operation of the other derrick functions, with the resistance of the rotation motor preventing rotation until a predetermined magnitude of side loading is imposed. Deactuation of the rotation motor and all of the other derrick functions results in a pressure decrease that renders the brake release means inoperable to allow the brake mechanism to prevent further rotation of the boom when the derrick functions have been completed or at any time that it becomes necessary to stop boom rotation, e.g., to avoid damaging contact with an adjacent object.
Inventors
- 👤 William Jennings Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:51
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/087; B; B66; B66C; B66C23/00; B66C23/62; B66C23/84; B66C23/86
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
193 words
A derrick comprising a base, a boom rotatably mounted on said base, means for rotating said boom, said boom rotating means being inherently reversible with a limited resistance to rotation for allowance of rotation of said boom upon imposition of a side loading condition above a predetermined magnitude, means for performing a derrick function that may result in side loading of said boom, a brake mechanism Normally acting to prevent rotation of said boom, means operable to release said brake mechanism to allow rotation of said boom, said brake release means being operable in response to operation of said boom rotating means to allow said boom to be rotated by said boom rotating means, said brake release means also being operable in response to operation of said derrick function performing means for releasing said brake mechanism to allow said boom to be rotated by side loading above said predetermined magnitude during operation of said derrick function performing means, and said brake release means being rendered inoperable in response to deactuation of both said boom rotating means and said derrick function performing means to allow said brake mechanism to prevent rotation of said boom.
Claim 2
Dependent Claim
193 words
A derrick comprising a base, a boom rotatably mounted on said base, means for rotating said boom, said boom rotating means being inherently reversible with a limited resistance to rotation for allowance of rotation of said boom upon imposition of a side loading condition above a predetermined magnitude, means for performing a derrick function that may result in side loading of said boom, a brake mechanism Normally acting to prevent rotation of said boom, means operable to release said brake mechanism to allow rotation of said boom, said brake release means being operable in response to operation of said boom rotating means to allow said boom to be rotated by said boom rotating means, said brake release means also being operable in response to operation of said derrick function performing means for releasing said brake mechanism to allow said boom to be rotated by side loading above said predetermined magnitude during operation of said derrick function performing means, and said brake release means being rendered inoperable in response to deactuation of both said boom rotating means and said derrick function performing means to allow said brake mechanism to prevent rotation of said boom.
Claim 3
Dependent Claim
61 words
A derrick according to claim 1 and characterized further in that said reversible boom rotating means is capable of allowing rotation of said boom in either direction of rotation, and said brake release means is operable to release said brake mechanism for boom rotation by side loading in either direction of boom rotation during operation of said derrick function performing means.
Claim 4
Dependent Claim
64 words
A derrick according to claim 1 and characterized further by a plurality of derrick function performing means, and in that said brake release means is operable in response to operation of any one of said plurality of derrick function performing means and is rendered inoperable in response to deactuation of said boom rotating means and all of said plurality of derrick function performing means.
Claim 5
Dependent Claim
69 words
A derrick according to claim 1 and characterized further in that said derrick function performing means is means for manipulating said boom and includes means for extending and contracting said boom and means for raising and lowering said boom, with said brake release means being operable in response to operation of any one of said boom rotating means, boom extending and contracting means, and boom raising and lower means.
Claim 6
Dependent Claim
84 words
A derrick according to claim 1 and characterized further by a load manipulating line extending from said boom, a winch mounted on said derrick and on which said line is wound, and in that said derrick function performing means includes means for rotating said winch to pay out and pull in said line, with said brake release means being operable in response to operation of said winch rotating means to release said brake mechanism during either paying out or pulling in of said line.
Claim 7
Dependent Claim
61 words
A derrick according to claim 1 and characterized further in that said derrick function performing means includes an auger mounted on said boom for digging holes in the ground, and means for operating said auger, with said brake release means being operable in response to operation of said auger operating means to release said brake mechanism during operation of said auger.
Claim 8
Dependent Claim
90 words
A derrick according to claim 1 and characterized further by a load manipulating line extending from said boom, a winch mounted on said derrick and on which said line is wound, and by a plurality of derrick function performing means including means for extending and contracting said boom, means for raising and lowering said boom, and means for rotating said winch to pay out and pull in said line, with said brake release means being operable in response to operation of any of said plurality of derrick function performing means.
Claim 9
Dependent Claim
238 words
A derrick comprising a base, a boom rotatably mounted on said base, hydraulically operated means for rotating said boom, said boom rotating means being inherently reversible with a limited resistance to rotation for allowance of rotation of said boom upon imposition of a side loading condition above a predetermined magnitude, hydraulically operated means for performing a derrick function that may result in side loading of said boom, a brake mechanism normally acting to prevent rotation of said boom, means for releasing said brake mechanism to allow rotation of said boom, and a hydraulic system operatively connected to said boom rotating means and derrick function performing means for selective operation thereof and including means for pumping a liquid through said system with sufficient pressure development capability to operate said boom rotating means and said derrick function performing means, said brake release means being connected to said hydraulic system for operation in response to operation of any one of said boom rotating means and derrick function performing means for releasing of said brake mechanism to allow rotation of said boom by operation of said boom rotating means or by side loading above said predetermined magnitude during operation of said derrick function performing means and to be rendered inoperable in response to deactuation of hydraulic operation of both said boom rotating means and said derrick function performing means to allow said brake mechanism to operate to prevent rotation of said boom.
Claim 10
Dependent Claim
238 words
A derrick comprising a base, a boom rotatably mounted on said base, hydraulically operated means for rotating said boom, said boom rotating means being inherently reversible with a limited resistance to rotation for allowance of rotation of said boom upon imposition of a side loading condition above a predetermined magnitude, hydraulically operated means for performing a derrick function that may result in side loading of said boom, a brake mechanism normally acting to prevent rotation of said boom, means for releasing said brake mechanism to allow rotation of said boom, and a hydraulic system operatively connected to said boom rotating means and derrick function performing means for selective operation thereof and including means for pumping a liquid through said system with sufficient pressure development capability to operate said boom rotating means and said derrick function performing means, said brake release means being connected to said hydraulic system for operation in response to operation of any one of said boom rotating means and derrick function performing means for releasing of said brake mechanism to allow rotation of said boom by operation of said boom rotating means or by side loading above said predetermined magnitude during operation of said derrick function performing means and to be rendered inoperable in response to deactuation of hydraulic operation of both said boom rotating means and said derrick function performing means to allow said brake mechanism to operate to prevent rotation of said boom.
Claim 11
Dependent Claim
58 words
A derrick according to claim 8 and characterized further in that said brake release means is connected to said hydraulic system upstream of both said boom rotating means and said derrick function performing means and is operated in response to hydraulic pressure in said system sufficient to operate said boom rotating means or said derrick function performing means.
Claim 12
Dependent Claim
52 words
A derrick according to claim 9 and characterized further in that the hydraulic pressure in said system at said brake release means connection increases upon hydraulic operation of said boom rotating means or said derrick function performing means, and said brake release means is operable in response to said increase in pressure.
Claim 13
Dependent Claim
33 words
A derrick according to claim 10 and characterized further in that said brake release means is hydraulically operated by said hydraulic system upon said increase in pressure at said brake release means connection.
Claim 14
Dependent Claim
77 words
A derrick according to claim 11 and characterized further in that said hydraulic system includes a boom rotation control valve connecting said hydraulic system to said boom rotating means for selective operation of said boom rotating means and a derrick function control valve connecting said hydraulic system to said derrick function performing means for selective operation of said derrick function performing means, with said brake release means being connected to said hydraulic system upstream of said valves.
Claim 15
Dependent Claim
93 words
A derrick according to claim 11 and characterized further in that said hydraulically operated brake release means includes a pressure responsive pilot operated valve connected to said hydraulic system and operable in response to said increase in pressure to connect said brake release means to said hydraulic system for operation thereby to release said brake mechanism, said pilot operated valve being responsive to a subsequent reduction of pressure in said hydraulic system to render said brake release means inoperative and thereby allow said brake mechanism to operate to prevent rotation of said boom.
Claim 16
Dependent Claim
42 words
A derrick according to claim 9 and characterized further by an additional derrick function performing means hydraulically operated by said hydraulic system and being connected thereto upstream of said brake release means connection for operation without operation of said brake release means.
Claim 17
Dependent Claim
47 words
A derrick according to claim 8 and characterized further by a plurality of hydraulically operated derrick function performing means operatively connected to said hydraulic system, and said brake release means being operable in response to operation of any one of said plurality of derrick function performing means.
Claim 18
Dependent Claim
89 words
A derrick according to claim 15 and characterized further in that said means for pumping includes a plurality of hydraulic pumps, each of which is connected in said hydraulic system to at least one of said derrick function performing means for hydraulic operation thereof, with said brake release means being connected to said hydraulic system downstream of each pump and upstream of said derrick function performing means For operation of said brake release means in response to operation of any one of said plurality of derrick function performing means.
Claim 19
Dependent Claim
75 words
A derrick according to claim 8 and characterized further in that said hydraulically operated means for rotating said boom includes a hydraulic motor connected to said hydraulic system for operation thereby, and relief valve means connected to said motor to allow said motor to operate reversely as an idler pump, said relief valve means being operable at a predetermined hydraulic pressure to allow said boom to be rotated by side loading above said predetermined magnitude.
Claim 20
Dependent Claim
51 words
A derrick according to claim 17 and characterized further in that said relief valve means is double acting to allow said motor to operate as an idler pump in either direction of boom rotation to allow said boom to be rotated in either direction by side loading above said predetermined magnitude.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |