US1948869A - Pull clamp - Google Patents

Description

Feb. 27, 1934. PINSQN 1,948,869

PULL CLAMP Filed May 23, 1932 A TTORNE Y.

1 N VEN TOR Patented F eb. 27, 1934 UNITED STATES PATENT OFFICE A 4 Claims.

This invention relates to a pull clamp, and, has for its object the provision of a clamp adapted to be applied to one of a plurality of insulators at the dead end of an electrical transmission line, or high tension wire, and to which clamp one end of a cable is connected, the other end of whichis connected to a winch, tractor,

truck, horse, or the like for pulling the wire sufliciently taut to enable the first insulator unit of the group to be readily connected to an eyebolt or equivalent element carried by the cross arm on a pole.

A further object of the invention is the provision of a clamp embodying a pair of like hinged members each provided with an anchored ball, which, when the clamp members are clamped around the metallic member of an insulator, the two bails will lie in close opposed relation, so that one end of a pull cable can be connected thereto to prevent opening of the clamp before, during and after pulling pressure is applied to the pull cable.

A further object of the invention resides in the provision of a clamp embodying two semi cylindrical clamp members, hingedly connected along one edge, said members being tubular and open at one end for the insertion of a suitable filler, made for instance of wood, or other fibrous material or of rubber or a like substance, or composition.

A further object of the invention is the provision of a clamp embodying two like hinged members, so designed on their inner faces as to conform to the contour of the metallic section of an insulator when the clamp is closed around the same and against which the clamp is adapted to pull.

A still further object of the invention is the provision of a pull clamp, which possesses advantages in points of simplicity and efliciency, and, at the same time proves itself comparative- 1y inexpensive in cost of manufacture.

With the above and other objects in view, the invention consists in the novel features of construction, arrangement and combination of parts hereinafter more fully described and finally pointed out in the claims hereto appended.

Referring to the accompanying drawing Iorming'a part of this specification, wherein like characters of reference denote similar parts throughout the several views:

Fig. 1 is a view illustrating the use of a clamp embodying the features of my invention and also shows the last of a plurality of insulators at the dead end of an electrical transmission wire as'connected to a pole cross-arm and the clamp removed from its respective insulator unit.

Fig. 2 is a view showing the clamp as applied to one of a plurality of flexible connected insulator units.

Fig. 3 is a side elevation of the clamp in its closed position.

Fig. 4 is an end view of the clamp clearly showing the fillers carried thereby.

Fig. 5 is an end 'view of the clamp in open position.

Fig. 6 is a perspective view of the clamp in open position and showing the opposite'end to that shown in Fig. 5.

In the drawing, the reference numeral A designates a pair of posts to which there is suitably fixed the usual cross-arm B to which are connected the dead ends of high tension electrical transmission wires C through the medium of a plurality of flexibly connected insulator units D. The insulator unit D at the inner end of each group of insulator units, is connected to a transmission wire C by means of a dead end clamp E, while the insulator unit D at the opposite or outer end of each group of insulator units D, is connected by means of a hook F to an eyebolt G on the crossarm B, as clearly shown on the right hand side of Fig. 1.

In carrying out the aim of my invention, I employ a pull clamp designated generally as H, embodying two hinged sections 1, which are adapted to be applied to one of the insulator units D, preferably, the second one from the end, as shown in Fig. 1, left hand side thereof, thus obviating the necessity of having to pull directly on the dead end of the transmission wire C, when connecting it to the cross-arm B through the medium of a plurality of insulator units D.

Each section, or member 1 of the pull clamp H, as shown in'Fig. 6, is semi-cylindrical in shape by providing the inner fiat wall 2 thereof with a longitudinally and transversely curved open ended recess 3, so shaped as to conform to a portion, of one half the contour of the metallic body portion of each porcelain insulator unit D. When the two clamp sections 1, which are connec'ed along one edge by means of a suitable hinge 5, are closed, as shown in Fig. 4, they form a central passage or opening 6 adapted to, receive the metallic body portion 7 of a porcelain insulator unit D, as clearly shown in Fig. 2.

Each semi-cylindrical clamp section 1 is provided with a semi-cylindrical recess, or pocket 8, which is open to one end of each clamp section. as will be-apparent from Fig. 2. A suitable tiller block 9 is receivable in the recess o'r pocket 8 of each clamp unit 1, and the filler 9 extends slightly beyond the edge of the open end of the recess or pocket 8, as clearly shown in Figs. 2, 3 and 6. The fillers, which may be made from wood, rubber, fiber, or similar material, are employed with the metallic clamp sections 1 for the purpose of preventing breakage of the porcelain insulator units D when applying, or removing the clamp from the metallic portion '7 of the insulator unit D. The end faces 10 of the fillers 9 engage the porcelain insulator unit D, when applied to the portion '7 thereof, as clearly shown in Fig. 2, thus preventing the metallic clamp sections 1 from coming into engagement with the porcelain insulator unit D.

To prevent outward displacement of the filler of each clamp unit 1, I lock them in their respective clamp section recesses, or pockets 8, by means of suitable fastening devices, such for instance, as nails 11, which are driven into the fillers 9 through openings in the inner faces of the clamp units, as will be apparent from Figs. 2 and 6.

Each clamp unit 1 is provided on its edge opposite the hinge connection 5, with a suitable bail. or eyelet forming member 12, which, when the clamp is closed, lie next to each other, as clearly shown in Fig. 4.

When the clamp is in open position as shown in Figs. 5 and 6, it is apparent that it can be readily applied to the metallic body portion I of one of the insulator units D, preferably the second one from the end, as clearly shown in Figs. 1 and 2. The clamp is applied to its respective insulator unit while they are on the ground. After the clamp has been applied to the body 7 'of the desired insulator unit D, a hook 13 at the end of a cable 14, which is carried over a sheave 15 suspended from the cross-arm B, is connected with both bails 12 which hold the clamp in its closed, or operative position around the metallic portion 7 of the insulator unit D.

Now, when it is desired to pull on the transmission line C, through the medium of the clamp H, applied to one of the metallic body sections of a porcelain insulator D, the free end of the cable is drawn by means of a tractor, winch. truck or horse until the first or outer end insulator unit has been raised to a position adjacent the cross-arm B from where it can be readily connected to the eyebolt G through the medium of the hook F carried by such insulator unit. The left end portion of Fig. 1 clearly shows the insulator units connected to the dead end of an electrical transmission line, or wire C, as raised to a posi ion adjacent the pole cross-arm B and ready for the connection of the outer end tuiit to the cross-arm.

From the foregoing description, it is evident that I provide a practical pull clamp adapted for ready application to a predetermined insulator unit, and easily removed therefrom, and that by the use of my clamp, there is no necessity of having to connect the pull cable 13 directly to the dead end of the transmission wire with the result that the several insulator units, which are heavy. are left to dangle about as the transmission wire is being drawn toward the cross arm B to which the end insulator unit is to be connected.

The many advantages of the herein described invention will readily suggest themselves to those skilled in the art to which it appertains.

From the foregoing description, it is evident that a simple device for this purpose has been disclosed, but it is to be understood that I do not desire to restrict, or limit myself to the very details of the construction shown and described, which is merely illustrative, it being obvious that changes, not involving the exercise of invention, may be made without conflicting or departing from the spirit of the invention within the scope of the appended claims.

What I claim is:

1. In a pull clamp construction, a pair of like hingedly connected hollow clamp members, each having an open end, a suitable filler for each clamp member with one end thereof projecting slightly beyond the edges of the open ends of the clamp members and adapted for engagement with the porcelain section of one of a plurality of insulator units having a metallic body and with the inner faces of the clamp members engaging the insulator unit when the clamp is applied thereto and closed, and means on each clamp member adapted to lie side by side when the clamp is closed and to which one end of a pull cable can be connected for holding the clamp in operative position around the insulator unit while pulling on said clamp by means of the cable to raise the dead end of a power transmission line to such an elevation as to readily permit connection of an end insulator with the cross-bar of a pole.

2. In a pull clamp for high tension wires having a plurality of flexibly connected flanged insulator units connected therewith, a pair of hollow semi-tubular members, a hinge connecting said members along one edge thereof, said members when in their closed relation providing a central passage therethrough to be occupied by a portion of one of the insulator units around which the members are clamped, a filler in each of the hollow semi-tubular members having one end face thereof shaped to conform to the contour of the flange of the insulator unit and projecting beyond one end of the semi-tubular members, and a bail like member connected to the outer longitudinal edge of each semi-tubular member which when said members are closed lie side by side to be connected by means of a hook on a pull cable which tends to hold the semitubular members in closed relation around the insulator unit.

3. A pull clamp having, in combination, a pair of semi-tubular metallic clamp members, a hinge connection along one side of the clamp members allowing the clamp members to be opened and closed relative to each other, said clamp members. each having an arcuately shaped recess open to one end thereof. a filler of softer material than the clamp members receivable in the recess of each clamp member and projecting beyond the open end thereof. I

4. A pull clamp having, in combination, a pair of semi-tubular metallic clamp members, a hinge connection along one side of the clamp members allowing the clamp members to be opened and closed relative to each other, said clamp members each having an arcuately shaped recess open to one end thereof, a filler of softer material than the clamp members receivable in the recess of each clamp member and projecting beyond the open end thereof and a handle like member on each clamp member adapted to lie side by side when the clamp members are in closed position.

NEWT A. PINSON.

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