Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB26452/19A
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Individual
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Individual
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Priority to GB26452/19ApriorityCriticalpatent/GB138577A/en
Publication of GB138577ApublicationCriticalpatent/GB138577A/en
E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B1/00—Percussion drilling
E21B1/12—Percussion drilling with a reciprocating impulse member
E21B1/24—Percussion drilling with a reciprocating impulse member the impulse member being a piston driven directly by fluid pressure
E21B1/30—Percussion drilling with a reciprocating impulse member the impulse member being a piston driven directly by fluid pressure by air, steam or gas pressure
Abstract
138,577. Rayner, G. H. T., and Rayner, P. Oct. 28, 1919, Addition to 138,556. Fluid-actuated gears.-Relates to an improvement in the construction described in Specification 138,576, which is an improvement in or modification of the construction described in the parent Specification, comprising the provision of steps and a sliding surface for the collar a. In the present construction, to facilitate the reversal of the valve, auxiliary inlet ports n<5> are provided to help balance the collar during the initial movements.
GB26452/19A1919-10-281919-10-28Improvements in valves and valve gear for rock drills and like percussive tools
ExpiredGB138577A
(en)