| Patent Number |
Title Of Patent |
Date Issued |
| 4395163 |
Mining appliance |
July 26, 1983 |
| A travelling mining appliance, particularly a travelling drilling and/or bolting appliance, having a protective roof. The appliance comprises a driving station used for controlling the movement of the appliance on the ground and a separate operating station, located on the side of the |
| 4326449 |
Double acting hydraulic jack with an end of stroke device |
April 27, 1982 |
| A double-acting hydraulic jack has a cylinder, a piston dividing the cylinder into first and second chambers of variable volume on opposite sides of the piston, and a piston rod with first and second passages opening into the first and second chambers respectively. The piston is move |
| 4300642 |
Device for reaming and collecting dust, for a drilling apparatus |
November 17, 1981 |
| A combined device for reaming and collecting dust for use with a drilling apparatus makes it possible to produce a flared mouth for the drilled hole, in particular for subsequently facilitating the insertion of an anchor bolt. The device includes a reamer, through which the drilling bit |
| 4291771 |
Rotary percussion hydraulic drilling machine |
September 29, 1981 |
| A rotary percussion hydraulic drilling machine has striker piston slidably mounted inside a cylinder which defines a first annular chamber connected to a one-way valve slidably mounted inside a chamber connected to an accumulator comprising a diaphragm, leading to which is a hydraulic fl |
| 4286899 |
Process for positioning strengthening rods in mine levels and public works |
September 1, 1981 |
| Strengthening rods are positioned in mine levels and public works by introducing into a long bore made in a wall or other surface to be strengthened, a thermosetting resinous composition and a metal rod of substantially the same length as the bore, and rotating the rod at a rotation |
| 4105081 |
Rock-drilling and bolt-setting apparatus |
August 8, 1978 |
| A bolt-setting and rock-drilling apparatus has a rail which can be swung about and axis and axially displaced therealong to position a drilling carriage and a bolt-setting carriage alternately with respect to a rock wall in which the bolt is to be lodged. The carriages are slidable on |
