Mine roof support chocks

• US 3,889,481 A
• Filed: 09/11/1973
• Issued: 06/17/1975
• Est. Priority Date: 09/14/1972
• Status: Expired due to Term

• Current Assignee: Harry Rosenberg, Walter Weirich
• Original Assignee: Harry Rosenberg, Walter Weirich
• Inventors: Weirich, Walter, Rosenberg, Harry
• Primary Examiner(s): Taylor, Dennis L.
• Application Number:
  US05/396,262
• Time in Patent Office: 644 Days
• Field of Search: 61/45D,63 299/31,33 91/17MP 248/357
• US Class Current: 405/290
• CPC Class Codes: E21D 23/006 provided with essential hydraulic devices

Abstract

A mine roof support chock having a beam interconnecting the coal-face-side props and a hydraulic control device positioned on the beam between these props. The device has a maximum dimension extending horizontally and transversely to the beam and is composed of components assembled along this dimension. A manually operable control lever of a selector mechanism of the device is accessible either from the coal face side of the chock or from the gap between the coal-face-side and goaf side props. The device employs a connection unit disposed remote from the lever which projects outwardly from the beam, either inwardly or outwardly of the chock, to connect with service conduits laid along the mine working. A control unit employing valves is connected between the selector mechanism and the connection unit.

Claims

1. A mine roof support chock composed of hydraulically operated props, a transverse beam connecting the props, which are in use disposed adjacent a mineral face, the beam having front and rear opposing walls facing outwardly and inwardly of the chock and an hydraulic control device for effecting operation of the chock;

wherein the device is disposed on one of the front and rear walls of the beam and has a manually operable lever movable about an axis extending substantially perpendicular to the beam and laterally of the chock, the device has a maximum dimension extending in the direction of said axis so that a part of the device projects from the wall on which the device is disposed into a space between the front and rear walls, which part is connected to conduits located in said space, and the lever is spaced from and adjacent that one of the front and rear walls of the beam upon which the device is disposed.

2. A chock according to claim 1, wherein the beam has a recess on its underside which accommodates a shifting ram which is connected between the chock and a longwall conveyor.

3. A chock according to claim 1, wherein the control device is assembled from separate components.

4. A chock according to claim 3, wherein said components are constituted by a connection unit adapted for cOnnection to service conduits, a control unit employing valves and connected to said connection unit and a selector mechanism connected to said control unit and employing a rotary slide valve operated by said lever and connected hydraulically at least to said props.

5. A chock according to claim 4, wherein the connection unit, the control unit and the selector mechanism are connected together along the axis of movement of the lever.

6. A chock according to claim 4, wherein the connection unit projects outwardly beyond the wall of the beam facing inwardly or outwardly of the chock.

7. A chock according to claim 4, wherein the connection unit has a projection which is connected to said control unit, the projection having a rib on its underside which locates in a recess formed between spaced-ribs on the beam.

8. A chock according to claim 7, wherein the ribs have holes which receive fixing means serving to effect connection between the beam and the projection of the connection unit.

9. A chock according to claim 4, wherein the connection unit, the control unit and the selector mechanism are connected together with the aid of screws.

10. A chock according to claim 4, wherein the control unit and the connection unit are each in the form of a metal block provided with borings for effecting hydraulic connections, the valves of the control unit being disposed in at least some of the bores of the block constituting the control unit.

11. A chock according to claim 1, wherein the axis of movement of the lever is substantially horizontal.

12. A mine roof support chock comprising a beam having a front wall and rear wall separated by a space through which service conduits follow a substantially rectilinear course, a set of hydraulically operated props interconnected by the beam, and a hydraulic control device for selectively connecting the service conduits with the props to effect operation of the same, said device comprising a selector mechanism, a control unit and a connection unit and being of elongate form, each of said walls having positions in which the control device is capable of being secured with the connection unit projecting into the said space thereby to facilitate the connection thereto of the service conduits without causing the latter to deviate unduly from their rectilinear course.

13. A mine roof support chock comprising a beam having a front wall and a rear wall separated by a space through which pass service conduits, a set of hydraulically operated props supported by the beam, and a hydraulic control device for selectively connecting the service conduits with the props to effect operation of the same, said device comprising a selector mechanism, a control unit and a connection unit, said selector mechanism being mounted to a front face of said control unit, said connection unit being connected to a rear face of said control unit by way of a projection maintaining said control and connection units in spaced apart relationship, said projection having a rib and each of said walls having a respective recess in which said rib may be received to locate said rib, and means for securing said rib in position to a selected wall, in which position the said control unit overlies the selected wall, the selector mechanism projects forwardly of the said selected wall, and the connection unit projects rearwardly of the said selected wall into said space for convenient connection with said service conduits.