US2240986A

US2240986A - Mine conductor support

Info

Publication number: US2240986A
Application number: US357287A
Authority: US
Inventors: Albert H Genter
Original assignee: DUQUESNE MINE SUPPLY Co
Current assignee: DUQUESNE MINE SUPPLY Co
Priority date: 1940-09-18
Filing date: 1940-09-18
Publication date: 1941-05-06
Anticipated expiration: 1958-05-06

Description

6, 1941. A. H. GENTER MINE CONDUCTOR SUPPORT Filed 'Sept. 18, 1940 INVENTOR flaw w. 4m.

BY z

MATTQRNEY Patented May 6, 1941 UNiTE STATS TENT QFFECE liHN E CONDUCTOR SUPPORT Pennsylvania Application September 18, 1940, Serial No. 357,287

3 Claims. (OI. ISL-40) This invention relates generally to trolley wire supports and more particularly to hangers for supporting and carrying a trolley wire conductor and a trolley wire feeder.

This invention may be advantageously employed for use with trolley wire systems in coal mines where overhead spacing is limited.

The principal object of this invention is the provision of an improved hanger clamp for supporting a trolley wire conductor and a feeder conductor wherein the two conductors are electrically connected through the medium of the hanger clamp.

Another object is the provision of a compact hanger clamp for supporting a trolley wire conductor and a feeder conductor within the least possible head room in a mine.

Another object is the provision of a hanger clamp for supporting a plurality of conductors in subjacent relation within a mine, wherein the low ceiling limits the head room, thereby pro ducing conditions in the ordinary overhead electrical transmission systems detrimental to safe transportation and other operations conducted in the mine.

Another object is the provision of an improved hanger clamp which is simple in construction and may be readily installed or worked.

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

In the accompanying drawing a practical embodiment illustrating the principles of this invention is shown, wherein:

Fig. 1 is a side elevation of the hanger clamp supporting a trolley wire conductor and a feeder conductor.

Fig. 2 is a vertical section taken along the longitudinal axis of the conductors.

Fig. 3 is a vertical section taken on the line 33 of Fig. 1 with parts being broken away,

Fig. 4 is a vertical section taken on the line t4 of Fig. 1 with parts being broken away.

Referring to the drawing, l represents the roof or ceiling of the mine which is drilled for receiving an expansion fitting to which the upwardly extending boss ll of the insulator I2 is secured. The circular plate 13 is an integral part of the insulator and its upper surface is arranged to fit up against the surface of the ceiling Iii forming a stop shoulder. This plate also covers the hole to protect it and prevent material from dropping out and loosening the expansion fitting. The insulating material is molded into the bell and is arranged to support the depending stud l4. When installed this insulator is thus adapted to receive a hanger for carrying electrical conductors closely adjacent the ceiling of the mine. These insulators may be positioned high on the side walls or at any convenient place on the ceiling of the mine for supporting feeders or signal conductors and the like through the mine tunnels.

The structure of the hanger clamp 25 comprising this invention is arranged to support a trolley wire conductor l5 and a feeder conductor I? in the same vertical plane. Since the hanger is constructed to carry a trolley wire the insulator l2 would be placed in the ceiling of the mine above the location of the trolley pole of a mine locomotive.

The hanger clamp i5 is made in two parts l8 and is, each of which is provided with a central body portion 28 having oppositely extending arms 2| dispose-d longitudinally of the axis of the feeder conductor H with their outer ends .22 projecting thereabove. The ends 22 of the arms are provided with aligned holes 23 for receiving the clamping bolts 24. The holes on one clamp memher are squared to prevent the bolt from turning when the nut is being tightened thereon as indicated at 25 on the drawing.

An upwardly extending boss 2%: is formed integrally on the central body portion 26 of the clamp member Hi. This boss is provided with a vertically threaded opening 21 for receiving the stud M depending from the insulator 12. Thus the hanger clamp I 5 is supported fromthe insulators by one of the hanger clamp members.

The inner faces of the body portions 28 and the arms 2| of the clamp members l8 and 19 are provided with mating grooves 30, which are approximately semicircular, for receiving the feeder conductor ii.

The inner faces adjacent the lower edges of the body portions 2!] are also provided with the small longitudinally extending grooves 31 forming opposed longitudinally extending gripping fingers 32 along the bottom edges of the body portions 28. These fingers are arranged to grip and support the trolley wire in its preformed longitudinal grooves. If the cross section of the wire is figure eight in shape the upper smaller portion will be received by the corresponding grooves 3| and the fingers 32 will grip the wire in the same manner.

The grooves 39 and 3!, together with their spacing, are constructed so that one size of hanger clamp will grip a four naught, six naught, or a number nine size trolley wire in the lower grooves 3i to properly support the same under 'of the arm 2|.

heavy loads and still provide sufficient clamping pressure for a one million or a seven hundred and fifty thousand circular mills feeder conductor in the grooves 30. For Wire sizes smaller than these a smaller size hanger clamp is required. Again shims or fillers may be supplied in the grooves 36 if the combination is such that the conductor carried by these mating grooves is relatively small in comparison with the trolley wire.

The land section 33 intermediate the

parallel grooves

30 and 3| is constructed to provide sufficient clearance between the flaring flanges of a worn trolley wheel or shoe and the bolt 24 and at the same time provide ample clamping pressure on the feeder conductor i! when the trolley wire 16 is tightly clamped by reason of the distance between the gripping fingers 32 and the fulcrum points 34 on the upper inner faces of the ends 22 Thus the clamp members l8 and I9 engage one another only at the fulcrum points 34 which are located above the bolts 24.

The outer ends 22 of the arms 2| are spaced from the bell portion of the insulator l2 at approximately the same distance as the boss 26 is from the inner edge of the bell portion. This provides ample clearance to prevent an electrical discharge between these points and also provides sufficient mechanical clearance to permit tightening or loosening the bolts 24 with safety. Again it will be noted that the upper surface of the ends 22 of the arms 2| are approximately at the same elevation as the top of the boss 26. This construction thus provides a compact mechanical structure which may be readily assembled and installed.

With this construction minimum head room is utilized in suspending the trolley wire which is a vital and important factor in suspending a trolley system in a mine.

I claim:

1. In a trolley wire support arranged to carry a plurality of conductors, the combination of a hanger having a downwardly open bell member, an insulated stud depending from the bell memher, a pair of complementary jaw members, at least one of said jaw members being attached intermediate of its ends to the stud, each jaw member consisting of an intermediate body portion and arms at either end of the body portion extending upwardly and outwardly to provide safety'gaps between the arms and the bell member, said jaw members provided with a plurality of grooves formed in the inner faces thereof and in subjaoent relation to each other, the corresponding grooves on the jaw members registering to receive the conductors, surfaces on the arms adjacent the free extremities thereof disposed to engage and form fulcrums between the two jaw members, and. means eifective between each fulcrum and the grooves for causing the jaw members to converge and support the conductors in said grooves.

2. A partible trolley wire clamp arranged intermediate of its ends for insulated support from above and to carry a plurality of conductors, comprising a pair of complementary jaw members each consisting of an intermediate body portion and arms at either end of the body portion extending upwardly and outwardly to provide safety gaps between the arms and the support said jaw members provided with a plurality of grooves formed in the inner faces thereof and in subjacent relation to each other, the corresponding grooves on the jaw members registering to receive the conductors, surfaces on the arms adjacent the free extremities thereof disposed to engage and form fulcrums between the two jaw members, and means effective between each fulcrum and the grooves for causing the jaw members to converge and support the conductors in said grooves.

3. A partible trolley wire clamp arranged to carry a plurality of conductors, consisting of a pair of complementary jaw members each having an intermediate body portion, connector means formed integral with the body portion of one of said jaw members and disposed with its axis in the plane separating the jaw members for supporting the clamp, arms on either end of each jaw member extending upwardly and outwardly and spaced from said connector means, a pair of grooves formed in the inner face of each jaw member in subjacent relation to each other, the corresponding grooves 0n the jaw members registering to receive the conductors, surfaces on the arms adjacent the free extremities thereof disposed to engage and form fulcrums between the two jaw members, aligned transverse holes in the arms between each fulcrum and the grooves, and clamping bolts extending through said holes for causing the jaw members to converge and support the conductors in said grooves.

- ALBERT H. GENTER.