The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 1986
Filed:
Oct. 07, 1983
Applicant:
Inventors:
Albert G French, Willington, GB;
Derek J Brooks, Ashby-de-la-Zouch, GB;
Assignee:
Coal Industry (Patents) Ltd., London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21C / ; E21F / ; E21B / ;
U.S. Cl.
CPC ...
299 81 ; 299 42 ;
Abstract
A rotary cutter head for a mining machine is provided with a plurality of cutter tools mounted on an annular end component which defines the end of the cutter head remote from the mining machine. Ventilating means are provided comprising air flow guide passages having air flow inducing spray means, the air flow inlets to the guide passages being in an exposed zone in which the action of cut mineral and/or of the newly exposed working face tends to scour the inlets preventing the build up of damp, fine mineral particles and thereby tending to prevent blockage of the inlets.