US2891752A - Mine roof bolts and hangers - Google Patents

Description

June 23, 1959 A. H. GENTER 2,891,752

MINE ROOF BOLTS AND HANGERS Fil ed March '7. 1956 ELy,5

INVENTOR. ALese r H. GEN Tale /-/1 .s A rrogusv United States Patent Ofiice MINE ROOF BOLTS AND HANGERS Albert H. Geuter, Mount Lebanon, Pa. Application March 7, 1956, Serial No. 570,144

3 Claims. (Cl. 248-71) This invention relates generally to mine roof bolts and hangers for supporting cables in mines and more particularly to hangers removably mounted on double headed roof bolts.

The hanging of pipe or cable within mine passages has always been a problem from the standpoint of convenience, safety, speed of installation and dismantling the same. Pipe or cable laying on the floor of the mine passage is frequently injured, causing the loss of fluid or an electrical fault. On the other hand the permanent installation or brackets on the walls or roof of the mine is much too expensive for temporary installations and no suitable or economical method has been devised to support pipe or cable from mine roof bolts which are now predominantly used for supporting the roof or ceiling of a mine.

The principal object of this invention is the provision of a double headed roof bolt for removably supporting a hanger having a socket that slips over a head of a mine roof bolt or other flange headed roof member. The present hanger is of simple construction produced at a very nominal cost. It can be installed in a few seconds over any double headed roof bolt in the mine and provides a convenient, safe and speedy installation. In the event the mine passage is to be abandoned the cable or pipe and hanger can be quickly removed and used elsewhere.

Another object of this invention is the provision of a hanger constructed to be installed over the head of a mine roof bolt, which is self-locking in that the weight of the pipe or cable laying in the U-shaped hook of the hanger pulls it downward, wedging the socket of the hanger between the head of the bolt and the mine roof plate, thus anchoring the hanger firmly in place.

Other objects and advantages appear in the following description and claims:

The accompanying drawing shows, for the purpose of exemplification Without limiting the claims thereto, certain practical embodiments of the invention wherein:

Fig. 1 is a view in side elevation showing the hanger inserted over the head of the mine roof bolt.

Fig. 2 is a view in top plan of the hanger.

Fig. 3 is an isometric view of the hanger.

Fig. 4 is an isometric view of the double headed mine roof bolt.

Referring to the drawings the hanger 1 is formed from a fiat piece of metal having one end bent U-shaped to produce a hook 2 while the other end is bent rearwardly substantially at right angles to form the leg 3 to be offset from the hook. The leg 3 of the hanger has a slot 4 formed therein which is open only at the right angle bend 5 and extends to adjacent the free end 12 of the leg 3.

That portion of the book 2 adjacent the right angle bend 5 has a slot 6 formed therein which is slightly wider than the slot 4. The opening 6 permits the hanger 1 to be inserted over the bolt head 7 of the double headed mine roof bolt 8 as shown in Fig. 1. This bolt has the threaded stem 9 extending in an expansion shell 13.

The double headed bolt 8 has the'enlarged head 7 and the reduced section 10 from which extends the stem 9. The enlarged head 7 is sufliciently strong to receive a wrench to secure the bolt in the expansion shell. The reduced section 10 is larger than the stem 9. The underside of the head 7 forms a flange surface between the perimeter of the head 7 and the reduced section 10.

The leg 3 being ofiset from the bight of the hook 2 and the thickness of the reduced section 10, or that distance between the roof plate 11 and the bolt head 7, being greater than the thickness of the leg 3, produces a locking action between the end 12 of the leg 3 and the plate 11.

Any vibration of the earth due to the mining operations or the movement of the cables or pipe in the hook 2 will cause the end 12 to gouge into the surface of the plate 11 as indicated at 14 and thus wedge and lock the hanger 1 in position. The weight on the hook being ofifset from the bolt pulls the hanger until the stop end 12 engages the reduced bolt section 10 rather than slide 011 in the opposite direction. The weighted hook must be raised to slide it back ofi the bolt head which is an additional locking feature.

The weight of the pipe or cable laying in the U-shaped hook 2 causes the hanger 1 to drop slightly, forcing the leg 3 into spaced engagement points 14 and 15 with the mine roof plate 11 and the bolt head 7, holding the hanger 1 firmly in place.

I claim:

1. A hanger apparatus comprising a hanger bolt having a head near its lower end in position to seat against the face of a ceiling surface or the like, a second head of greater cross section than the first-named head, formed upon the under side of the first head, a hanger that has a vertical leg bent outwardly in hook form at its lower end and having a rearwardly-extending horizontal leg formed on its upper end, the vertical leg having an opening therethrough adjacent to the angle of its juncture with the horizontal leg and merging with a smaller opening through the horizontal leg, the smaller opening serving as a continuation of the first-named opening and of greater horizontal dimensions than the first-named head but narrower than its second-named head, throughout the major portion of its length, the larger opening being wider than the second-named head, to permit the slotted portion of the hanger to he slid forwardly into position on the secondnamed head.

2. A structure as recited in claim 1, wherein the thickness of the first-named head is greater than the thickness of said horizontal leg, whereby when a load is supported in said hook the leg will be tilted for biting engagement with the front end of the second-named head, in biting engagement with the plate at its rear end.

3. A hanger comprising a mine roof bolt that extends upwardly through a roof plate for securing in the roof, a first head near the lower end of said roof bolt that seats against the under side of said plate, a second head in the form of a flange on the under side of said first head and of greater cross section than said first head, a hanger strap thinner than the thickness of said first head and having a vertical leg and an outwardly extending horizontal leg formed by an angle in said strap, said vertical leg bent outwardly in hook form at its lower end and having an opening therethrough adjacent to the angle of the juncture between said horizontal and said vertical leg and merging with a smaller opening through the horizontal leg, the smaller opening serving as a continuation of the first named opening and of greater horizontal dimension than the first named head and narrower than the second named head throughout the major portion of Patented June 23, 1959- UNITED STATES PATENTS 926,246 Dorff June 29, 1909 10 4} Schultz June 17, 1941 Sleeth June 9, 1942 Meyer June 16, 1942 Brush Jan. 29, 1946 Tinnerman Aug. 18, 1953 Larson et a1 Aug. 30, 1955

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