Abstract: A hoist cage is supported by a loop of rope extending around a drive sheave and an idler sheave respectively positioned at the ends of the hoist cage path and attached to the hoist cage by attachment of separate ends of the loop to separate drums rotatably attached to the hoist cage. The drums are coupled to rotate together to take up and pay out rope at different rates and in opposite senses with the rate being higher for the drum from which the rope extends downwardly.

Abstract: The invention relates to rack and pinion lifts, which include a lift car which is driven via toothed wheels by means of an electromotor along a rack carried by a lift mast, said car containing a control and maneuver unit for the electric motor with a control and maneuver button set including floor call buttons, landing based call button units being connected to said control and maneuver unit via a ground level unit from which also a power cable leads to the lift car.In association with the lift car a sensor device is arranged to indicate passage of teeth of the rack or the toothed wheel and produce corresponding position impulses, which represent the position of the lift car.A micro computer system is connected for receiving the position impulses and for collecting and storing call impulses from the call units and destination impulses from the button set of the control and maneuver unit, and based upon the position of the lift car ordering travel direction, retardation and stop of the lift car.

Abstract: An apparatus for automatic bolting in rock reinforcement, the apparatus (11) having a drill (3) an injector, a bolting machine (5), a supply beam (6) a machine carriage (7) which is movable along the supply beam, a linear machine shifter switch (8) by means of which the drill and the bolting machine may be inserted on the machine carriage and which is shiftably disposed along and lockable on the supply beam for different bolt lengths, a working position adjustment device (9) which has sockets (10,11,12) for accommodating a drill bit (13), the forward end of the hose (14) of an injector, a bolt, and a positioning rod (15) which is fixedly mounted on the forward end of the supply beam and may be brought into abutment with the rock face for directing, by means of the appartus, in sequence, the drill bit, the hose and the bolt, at a point on the rock face for the purpose of accomplishing the rock reinforcement operation.

Abstract: This invention relates to an apparatus for separating fine material from coarse material.The screens at present in use in the mining industry usually are so-called shaking screens. They comprise a screen-cloth, which is subjected to a vibration movement. This type of screen, however, has a very high noise level and also is exposed to heavy wear owing to the vibrations, to which the screen parts are subjected.The present invention has the object to provide an apparatus of the kind referred to above, in which the noise level and the mechanical wear are substantially lower than at conventional screens.

Abstract: In apparatus for injecting and mixing a ground stabilization agent into the material of the earth during the operation of an earth drill, a device is provided for generating signals indicative of the upward movement of the earth drill as the drill is withdrawn and while the stabilization agent is being introduced, and a weighing device is provided for constantly weighing the remaining supply of ground stabilization agent and for thereby measuring the weight of stabilization agent delivered to the ground, and a recorder is connected to receive signals from both of the devices for providing a graphic record of the stabilization agent delivered versus the upward travel of the earth drill.

Abstract: An apparatus for inhibiting the oscillation of a vertical crane or similar structure with a horizontal main jib supporting a load hoist apparatus. The main jib has a counter jib which supports a counterweight mass by a linkage system. The linkage system permits the counterweight mass to swing through an arc so that it dampening the swinging movement of the crane. The linkage system also permits the counterweight mass to be vertically adjustable relative to the main jib so as to accommodate crane structure of different sizes.

Abstract: Rails are mounted on the wall of a domelike reactor tank along pilasters extending downwardly from the top of the dome. A carriage is drivably mounted on the rails along each pilaster. The carriages each comprise drive means, and a working and inspecting platform. The platform is pivotally mounted and means are provided to control the setting of the platform so that it is always kept horizontal, irrespective of the slope of the rails.The carriage comprises a main frame in which two sub-frames are pivotally mounted one after the other, on pivot means extending transversally of the direction of motion of the carriage. Two wheel units, or boggie frames, are pivotally mounted in each sub-frame, one on each side of said pivot means. Each boggie frame is carried by wheels engaging the rail means.

Abstract: A system for indicating the stop levels for an elevator car in a hoist shaft so as to transmit signals to the elevator machinery when a selected stop level is approached. Vertically aligned pins are provided projecting from the wall of the hoist shaft; at least one pin being provided for each stop level. The pins extend into the path of the arms of the a cross, fixed to one end of a shaft journaled in a box which is attached to the outside wall of the elevator car and cause the cross and shaft to rotate a quarter turn each time one of the arms of the cross engages one of the pins. The other end of the shaft carries a pinion gear which engages a movable rack connected to a linearly movable slide mounted on the elevator car. One end of the slide ends in a stairstep-like configuration, each step serving to actuate one microswitch in a transverse row of microswitches as the slide moves.

Abstract: A stopping apparatus is suspended in a pilot shaft and blasting charge holes are drilled outwardly and downwardly from successive vertical positions from the bottom to the top of the pilot shaft to provide a circular array of holes fanned-out from each vertical position. The blasting charge holes are loaded with blasting charges, and detonated, proceeding from the bottom to the top of the pilot shaft.

Abstract: A halt selector system for a vehicle movable along a defined path, such as an elevator, comprises at least one bistable unit associated with each halt position and adapted to assume one state when the vehicle is located at one side of the halt position and its other state when the vehicle is located at the other side of said halt position, and a switch-over device for switching the state of said bistable unit when the vehicle is moving along the path and is at a predetermined distance from the halt position such that the vehicle can be stopped at said halt position. A transmitter, associated with a control circuit which includes the bistable device, is adapted to send one of three distinguishable signals to a receiver and associated operating unit for the drive machinery of the vehicle.

Abstract: A fluid operated drill is supported upon a boom, which is in turn supported upon a mechanism for moving the boom to different positions, the mechanism being rotatable about a central axis with respect to a relatively stationary frame. A fluid collector means is provided including circumferential grooves communicating with channels for conducting operating fluids from the frame to the positioning mechanism and the fluid operated drill.

Abstract: In a hydraulic striking device having a reciprocating piston there are first and second cylindrical spaces surrounding the piston, the first space continuously communicating with a high pressure circuit and the second space alternately communicating with the high pressure circuit and a low pressure circuit. A special sleeve-shaped control valve in the second space reciprocates axially of the piston to achieve the desired operation.

Abstract: The invention relates to a method of dismounting or mounting jib sections on a tower crane, at which a carrying cradle with counterweight and having the form of a three-armed lever is used for lowering or hoisting jib sections to be dismounted and mounted, respectively, and the cradle is so designed as to during the lowering and hoisting operations, respectively, to assume suitable balanced positions.

Abstract: Equipment for injecting and mixing a pulverulent ground stabilizing agent into the material of the ground including an improved feeding means having a cylindrical chamber with rotatable vanes separating the chamber into compartments for receiving the pulverulent material and including pressure fluid passages for communicating with each compartment as pulverulent material is to be discharged therefrom for carrying the material out of that compartment.

Abstract: A blasting cap is detonated to convey a shock wave to thereby initiate the explosion of an explosive charge by means of a remotely operable pressurized fluid operated blasting cap detonating device including a fluid pressure operating piston, a compression spring operable to absorb energy from the piston, and a striking pin operable for release by engagement thereof by the piston and then operable for final movement in response to force from the compression spring.

Abstract: A hydraulically operated percussion apparatus comprising a housing in which a reciprocating impact piston is arranged to transfer impact energy to an impact tool, pressure chambers defined between said housing and said piston, and a channel system including a high pressure and a low pressure branch for conducting hydraulic pressure fluid to and from the pressure chambers, a first one of said chambers containing a movable distribution valve member responsive to the movements of the piston for alternately connecting said first chamber to said high pressure branch and said low pressure branch, respectively, characterized in that said valve member is arranged to be transported by the piston when moving in one direction, and responsive to the movement of the piston in the other direction to be acted upon by the pressure fluid to move in said other direction by means of hydrostatic pressure, said valve member having a longer path of movement than the impact piston and being arranged, at its movement in said one dir

Abstract: This invention relates to a device for use in elevators for the unlocking and locking of closed doors, gates, bars or wickets. The device comprises a mechanical locking means arranged at the door, gate, bar or wicket and includes a locking bolt moved to locking position by a spring. The locking bolt is movable against the action of the spring to a non-locking position by means of an electromagnet which is arranged to be activated, by a lock actuator device carried by the elevator cage, when the cage is at a holding floor at which it is to be stopped. The locking means further includes an electrically conductive element, preferably in form of a contact washer around the locking bolt or a prolongation of the bolt, which element follows the motion of the locking bolt and operates to close an electric circuit when the bolt is in locking position.

Abstract: A rock drilling apparatus comprises a hydraulically rotated drill, a percussion motor having a piston which transfers impact energy to the drill, the piston defining together with the machine housing first and second pressure chambers for receiving pressure liquid to move the piston, the percussion motor having a hydraulic circuit including a high pressure side and a low pressure side, a pressure liquid distributing valve having a control input for receiving a control pressure, the distributing valve being located in the hydraulic circuit of the percussion motor for alternately connecting at least one of the pressure chambers to the high pressure side and low pressure side, respectively, of the hydraulic circuit in response to the control pressure, the hydraulic circuit for rotating the drill being separate from the hydraulic circuit of the percussion motor and including a high pressure side and a low pressure side separate from the high and low pressure sides of the percussion motor, a control valve for cont

Abstract: A machine for excavating underground galleries, comprising a frame displaceable within a gallery, an arm pivotally connected to said frame, means for adjusting the orientation of said arm in a plurality of directions, said arm having a rotary tool carrier provided with cutting tools distributed over the periphery thereof located to operate in a plane perpendicular to the direction of the arm, the machine having means enabling the pivotal connection between the arm and the frame to occupy two distinct alternative positions, in each of which positions the means supporting said pivotal connection can be immobilized.

Abstract: The machine includes two half-frames vertically arranged side by side, with two parallel vertical shafts respectively supported by the two half-frames. A separate turret is pivotally supported around each of the shafts, each turret having a cutting head which can rotate around a horizontal axis and which is equipped with tools for excavating. The two half-frames are slidably movable horizontally in relation to one another, with a control member connected between the half-frames for controlling the relative movement, the two half-frames being selectively positionable on the gallery floor by said relative movement, one half-frame being movable while the other half-frame remains fixed in position.