Pivotal roof bolter and extendable rotatable protective canopy f

Details Pivotal roof bolter and extendable rotatable protective canopy f Pivotal roof bolter and extendable rotatable protective canopy f

1978-12-26

1981-10-27

Purser, Ernest R.

Hydraulic and earth engineering

Miscellaneous

299 12, 299 33, 175219, E21D 1904

Patent

active

042970571

ABSTRACT:
The invention is an improvement for a combination mining machine and roof bolting apparatus in which the roof bolting mechanism is pivotable and can be used to install roof bolts in more than one location without moving the mining machine. The improvement is a pivotable canopy which pivots independently of, but in association with, the bolting apparatus. It comprises a canopy shield pivotably and cantileveredly mounted on the upper section of a telescopically-extensible mast. The telescopic mast absorbs all the moment loads, while the hydraulic extension cylinder disposed interiorily of the mast incurs only axial compressive loading.

REFERENCES:
patent: 1337487 (1920-04-01), Schlatter
patent: 2711634 (1949-05-01), Joy
patent: 3546831 (1970-12-01), Romo et al.
patent: 3865197 (1975-02-01), McCormick
patent: 3893520 (1975-07-01), McCormick
patent: 4108253 (1978-08-01), Woodford

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