Verfahren und Vorrichtung zum Einbau von Bolzen in Grubendecken

1312832 Nailing machines PIN-SET CORP 28 July 1970 [1 Aug 1969] 36372/70 Heading B4C [Also in Division F2] Pins 44 are driven into a mine roof by a substantially smooth pushing force applied to the pin head 46. This force is defined as being such as will push the pin in relatively slowly and excluding impact forces. A pin setting device for inserting pins by this substantially smooth pushing force comprises an elongate guiding means having an open end 13, 14, a piston 20 movably mounted in the guiding means, jacking means 30 for locating the open end of the guiding means at a predetermined area of a mine roof and fluid means for applying a substantially smooth pushing force to the piston to urge the piston towards the open end of the guiding means. The hydraulic jacks 30 also provide a compressive force on the roof strata to improve the strength of the anchoring of the pin. The piston is preferably in two parts, the upper having a depression 23 to receive the head 46 of pin 44 and a ring 24 to wipe the cylinder, the upper and lower parts having sealing piston rings 25. A switch 41 prevents operation of the pin setting piston until the device is positioned securely between floor 12 and roof 11.