Anti-buckling device for mine-roof bolting machines

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance

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Details

173 38, 91405, 182 19, B23B 4722, E21C 511

Patent

active

043288723

ABSTRACT:
The invention comprises generally apparatus for use with an underground mine-shaft roof-bolting machine having a torque motor, a pinning rod held for rotation by the torque motor, a controllable arrangement for exerting upward thrust on the torque motor to force the pinning rod upwardly into the roof of a mine shaft, and a manual control for the upward thrust arrangement. In a first embodiment, a contoured cam rotates in dependence on the elevation of the torque motor, while a valve controlled by the cam limits the maximum upward thrust applied to the torque motor such that the maximum upward thrust on the torque motor is reduced when the torque motor is at a comparatively low elevation and is increased when the torque motor is at a comparatively higher elevation. Variations of the cam arrangement permit adjustment for use in mine shafts having different roof heights, and permit use with different types of roof-bolting machines.
A second embodiment of the invention utilizes a non-linear spring to control the limit valve. A third embodiment utilizes a light beam to detect buckling of the pinning rod and to disable the upward thrust means, while a further embodiment employs a Scotch yoke and pin to control a limit valve.

REFERENCES:
patent: 2320874 (1943-06-01), Lehmann
patent: 2322741 (1943-06-01), Osgood
patent: 2333487 (1943-11-01), Nast
patent: 2754804 (1956-07-01), Miller
patent: 3211025 (1965-10-01), Mottu
patent: 3247913 (1966-04-01), Hallberg et al.
patent: 3670826 (1972-06-01), Hanson et al.
patent: 3724559 (1973-04-01), Stromnes
patent: 3756669 (1973-09-01), Bucelluni
patent: 3835939 (1974-09-01), McEntire
patent: 3933208 (1976-01-01), Bailey et al.
patent: 3967686 (1976-07-01), Foegelstroem

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