US1708761A - Crossbar setter - Google Patents

Description

IN VENT OR :S ATTQRNZY Patented Apr. 9, 1929.

i UNITED STATES MICHAEL HORBATH, OF LOWBER, PENNSYLVANIA.

CROSSBAR SETTER.

Application lediAugust 23, 1927. Serial No. 214,855.

This invention relates to a new and useful device in the nature of a cross bar setter particularly adapted to be used by miners, and the like, for the purpose of supporting the roofof a mine during mining operations.

The object of the invention is to provide a cross bar setter of novel construction and arrangement of parts, hereinafter more fully described, claimed, and illustrated in the accompanying drawing.

Fig. 1 is a side elevational view of my improved cross bar setter.

Fig. 2 is a top plan view thereof.

Fig. 3 is an enlarged transverse sectional view taken on the line 3 3 of Fig. l.

Fig. 4 is a further development thereof, showing in particular the means of adjust- Y ably attaching the cross bar to the vertical support member.

F ig. 5 is a vertical sectional view taken on the line 5-5 of Fig. 4.

As here embodied my improved cross bar setter comprises aplate member 10 or supporting member. The leg supporting members 11 are hinged as at 12, to the lug elements 13 of the plate member. rlhe leg supporting members 11 are of'tubular construction adapted to slidably receive the leg members 14 so as to permit the leg members 14 to be extended therefrom. The' threaded members 15, set screws, or the like, are threadedly mounted in the leg supporting members 11, and are adapted to engage any desired one of the notcheslG formed in the leg members 14 as a means of holdingl the leg members 14 in any desired extended position. The above described construction is such as will permit the leg supporting members 1l to be folded when not in use, so as to provide a compact, easily carried device. IThe .casing 17 or housing, is secured to the center portion of the plate member 10 and is extended vertically therefrom, in opposite directions. The casing 17 is of hollow construction, and adapted to slidably accommodate the rack bar 18. The casing 17 is provided with an open upper end, so as to permit the rack bar 18 to be extended from the said casing. The rack bar 18 is provided with gear teeth adapted to mesh with the pinion 19 secured to the shaft 20, rotatively mounted in the casing 17. The hand wheel 21 is provided with a handle 21', and is secured to the shaft 20, and is positioned outside the casing 17. The threaded member 22, a set screw, is threadedly mounted in the casing 17 and is adapted to engage any desired one of the notches 23 formed in the rack bar 18 so as to hold the raclr bar 18 in any desired extended position. The rod 24 is adapted to slidably engage in the casing 17 in contact with the upper extremity of the rack bar 18 and is extended through the upper open end of the casing 18. The rod 24 is provided with an enlarged head 25 formed spherical, adapted to pivotally receive the intermediate cross bar 26, which 1s provided with a semi-spherical aperture adapted to receive the enlarged head 25 of the rod 24. rlhe intermediate cross bar 26 has hinged thereto, as at 27 and 28, respectively, the cross bars 29 and 30. The pins 31 and 32 are adapted to engage in apertures formed in the cross bars 29 and 30 and in the intermediate cross bar 26 so as to hold the said cross bars in oppositely extended positions therefrom. The above described construction is such as will permit the cross bars 26 and 27 to be hinged inwardly as at 32 and 33, respectively, so as to provide a compact portable device.

A pair of extension members 29 and 30 are slidably mounted in the cross bars 29 and 30, and are provided with an enlarged extremity 31. The latter described construction is such as will permit the said extension members to be slidably extended in opposite directions.

The above described construction is such as will permit the cross bars 26 and 27 to be raised as may be desired, by rotating the hand wheel 21 and which will permit the said cross bars to be angular-ly positioned as may be desired to accommodate a slanting mine ceiling, or upper wall of a mine, or mine shaft. The extension members 29 and are slidably' extended, so as to permit my improved device to support the ceiling of the mine.

In Figs. 4 and 5 of the accompanying drawing, I have shown sector members 34 and 35 secured to the intermediate cross bar 26. The sector members 34 and 35 having formed therein sector apertures 36, adapted to slidably receive the extended portions of the pin 37, secured to the block 38, slidably mounted in the axial aperture 39 formed in the upper portion of the rod 24. The expansion springs 40 and 41 are positioned in the aperture 39 directly below and above the said block 38. The spring 41 is comparatively stronger than the said spring 40 so as to hold the extended portions of the pin 37 llO in engagement with any desired one of the p notches 42, extended-doWnWardly from the more readily manipulated device.

Having thus described my invention what i I claim as new'and desi-re` to protect by Letters Patent of thevUnited States is as follows: 'v

4A cross barv setter of the class described, a vertical rod, a means for raising and loweringthe same, an intermediate cross bar piv otally mount-ed on the top end of the rod, a

vmedi-ate bar, and pins removably engaging apertures in the cross Vbars and the inter- -mediatebar for releasably holding the end cross bars in oppositely extended positions for supportingy the ceiling of a mine, and for permitting hinging of the end crossbars to provide a compact portable device.

In testimony whereof I have afxedmy signature.

Y' MICHAEL HORBA'IH.4 i

Images