Telescopic support props for mineral mining

Details Telescopic support props for mineral mining Telescopic support props for mineral mining

1982-12-17

1985-06-18

Maslousky, Paul E.

Motors: expansible chamber type

Extension of unit having separately controlled working...

Control of motive fluid for one working member in response...

91173, 91207, 92 53, F15B 1118

Patent

active

045235120

ABSTRACT:
A telescopic prop for use in mine workings extends and retracts over three stages. The prop has an outer main base member 1 with respective first, second and third concentric inner members 2, 3, 4 disposed one within another. The first inner member has a piston 6 in which is arranged a non-return valve 23 which normally shuts off communication between a working chamber 20 associated with the first and base members and the working chambers 22, 27, 29 pertaining to the other members. A plunger 24 is provided to open the non-return valve when the first inner member is nearly fully retracted inside the base member so that after retraction of this stage the other stages can be retracted. The second or intermediate member also employs a piston 9 which is connected via a rod 13 with an auxiliary piston 15 disposed in a working chamber associated with the uppermost third member. The areas of the working faces of the respective pistons are designed so that the prop has a practically equal supporting force over the its entire range of displacement.

REFERENCES:
patent: 165472 (1875-07-01), Brinckerhoff
patent: 2517153 (1950-08-01), Wood
patent: 2933070 (1960-04-01), Trumper et al.
patent: 3252680 (1966-05-01), Lee et al.
patent: 4191092 (1980-03-01), Farmer

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