US1230215A

US1230215A - Guy-clamp.

Info

Publication number: US1230215A
Application number: US9729716A
Authority: US
Inventors: Henry W Pleister
Original assignee: HENRY B NEWHALL
Current assignee: HENRY B NEWHALL
Priority date: 1916-05-13
Filing date: 1916-05-13
Publication date: 1917-06-19
Anticipated expiration: 1934-06-19

Description

H. W. PLEISTER.

GUY CLAMP.

APPLICATION FILED MAY [3. "H6- 1,230,21 5. Patented June 19, 1917.

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mm m 10 2 garrrrm l /VKEZTOR 87 ATTORNEY! UNITED STATES PATENT ornion HENRY W. PLEISTER, OF- WESTFIELD, NEW J ERSEY, ASSIGNOR T0 HENRY B. NEWHALL.

GUY-CLAMP.

Specification of Letters Patent.

Patented June 19, 1917.

Application filed May 13, 1916. Serial No. 97,297.

To all whom it may concern Be it known-that I, HENRY W. PLEISTER, a citizen of the United States, residing-at Westfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Guy-Clamps, of which the following is a specification, taken in connection with the accompanyingdrawing.

My invention relates to guy clamps and more particularly to such guy clamps as are used in telephone and telegraph installations. v

Among the advantages of my invention are greater efficiency in gripping and holding what are known in telegraph and telephone construction as messenger and guy strands, economy inconstruction, and simplicity and ease of application and reducing the number of partsof the ordinary clamp now in use by omitting the nuts.

In the accompanying drawing in which the same reference numeral refers to similar parts in the several figures.

Figure 1 is a plan view partly broken away for purposes of clearer illustration;

Fig. 2 is a longitudinal vertical section substantially on the line 2- 2 of Fig.1, looking in the direction of the arrows;

Fig. 3 is a longitudinal section substantially on the line 33 of Fig. 1, looking in the direction of the arrows;

Fig. 4: is a transverse vertical section substantially on the line H of Fig. 2;

Fig. 5 is a diagrammatic view showing one of the advantages of my clamp over the old form.

The common practice of running messenger strands between poles, up to a comparatively recent date, was to take the end which would not reach to the next pole, known among the linemen as the dead end, wrap it around the last pole reached, This caused a loss of from approximately ten to one hundred feet of'most expensive wire messenger'strand.

In the new practice the messenger strand is continued without wrapping or other interruption by means of connections should the end of messenger strand not extend to the next pole. The free end of the messenger strand is bent back on itself forming an eye (not shown) which engages the end of the next stretch of messenger.

The end of the messenger which is bent back is secured by means of several guy 1 clamps to obtain the necessary holding capacity. The slipping of the guy clamps is very dangerous for the reason that it may occur when a lineman is in a boatswains seat between poles causing loss of life. Or if the guy clamp is used to brace a pole the guy clamp might slip when the pole is under heavy wind or sleet pressure permitting the pole and wires to fall. For these reasons a plurality of ordinary guy clamps have to be used for each connection which necessitates an additional outlay and additional labor in installing them.

In my improved guy clamp 1 the parts are so formed that I dispense with the use of nuts, make my clamp of the minimum amount of metal, thereby saving expense, and at the same time so locate the metal in the clamp that this saving of material has an additional advantage as it permits the portion of the clamp 2 which lies between the thicker or more rigid parts of the clamp 3 to yield slightly at 4, 4 when great pressure is exerted by the bolts 5, 5-v In the drawing this yielding of the weakened portion 2, as shown by lines l, 4, is exaggerated, for purpose of clearer illustration.

The clamping member 6, is provided with a plurality of bosses 8, Shaving an opening 9 large enough to permit free passage of the bolts 5.

The clamping member 7 is provided with

bosses

10, 10 which are tapped to form female screwthreads to cooperate with the male screwthreads on the

bolts

5, 5. To permit these bolts to have a strong and powerful grip I preferably extend the

bosses

10, 10 so that they extend out a little more from the member 7 than do the bosses 8 of the member 6. By having the bolts screwed directly into these bosses 10 I avoid the necessity of using nuts, their expense, and the additional labor of applying them.

' Both the

bosses

8 and 10 are preferably, though not necessarily, formed as truncated cones. This tends to distribute the tremendous pressure of the bolts over the messenger strands 11, which lie in the clamp 1, in such a manner as to give the greatest compression immediately adjacent to the bolts and the least pressure at

points

12,12 in the surface of contact at equi-distant points between the bolts 5.

This is particularly advantageous as it is found in practice that a clamp which gives an equal pressure throughout the surface of contact readily slips under the strains to which these devices are subjected. It is for this reason that a plurality of such old clamps have to be used. With my invention it is only necessary to use one clamp for, in effect, my clamp makes a plurality of bites into the messenger or guy strand without, however, injuring in any particular the small wires which together form the messenger or guy strand or cable. By using my clamp should it be desired at some future time to use the messenger strand or guy strand, in some other location, the portion engaged by my clamp will not have any of the constituent wires marred, or broken which would, of course, seriously lessen its strength which is found to be the case with some of the guy clamps now in use. 1

Each

member

6 and 7 is preferably provided with

grooves

12, 12 to receive the

messenger strands

11, 11, or guy strands as the case may be. The size of these

grooves

12, 12 as well as the size of the

members

6 and 7 will be varied to cooperate with a messenger strand or guy cable of any cross section.

It will be noted that the conical truncated bosses 8 have their bases in the bearing surface 13, Fig. 4:, of the member 6, while the conical truncated bosses 10 have their bases in the bearing surfaces 14; of the member 7. These bearing surfaces 13 and 141 are the opposed surfaces of the

members

6 and 7. By this construction the bases of these

truncated cones

8 and 10 extend beyond the vertical axes of the wire strands or

messenger

11, 11 and transmit the compression of the

bolts

5, 5 with greatest force at points in the

strands

11, 11 nearest the axis of the bolt. Moreover by this construction having the bases of the truncated cones inthe bearing surfaces of the

members

6 and 7, the compression is a positive one for the bases of the cones- 8 extend and merge into the outer'surfaces 15, 15 of the memher 6, Fig. 5, while the bases of the cones 10 extend and merge into the

outer surfaces

16, 16 of the member 7.

I have shown in dotted lines in Fig. 5 this particular advantage of my clamp over one in which the strands or wire cable are clamped by members which do not lie in the base of truncated'cones. In this Fig. 5, the dotted line indicates such a construction wherein after a certain amount of pressure has been applied the surfaces gripping the wire cable would tend to spring or bend at the points 17, 17'. In my construction this action is impossible and consequently I can get a far greater compression on the strands of wire cable.

In my preferred. construction I preferably alternate the rigid portions 3 and the relatively yielding or flexibleportions 2.

I preferably make my guy clamp of mallcable iron and have found that it has a far greater bending limit than the old style rectangular block forms of clamps. I I

While I have illustrated and described the

bosses

8, 8 and 10, 10 as being frustums of cones, it is to be distinctly understood that they may be frustums of cones, pyramids, or the frustums of any polyhedron. For convenience and brevity I have in some of the claims included frustums of cones but it is to be understood that any equivalent construction is included such as frustums of pyramids or any polyhedron.

Having thus described this invention in connection with several illustrative embodiments thereof, tothe details of which I do not desire to be limited, what is claimed as new and what is desired to secure by Letters Patentvis set forth in the appended claims. I s

1. A guy clamp formed of two members, each member having comparatively rigid portions and intermediate said rigid portions comparatively weak portions which at great pressure yield slightly, andmeans' passing through the comparatively rigid portions to clamp the two members together.

2. Aguy clamp formed of two members, each member having comparatively rigid portions which on one member are provided with internal screwthreads and on the other with an opening for a bolt, and intermediate said rigid portions comparatively weak portions which at great pressure yield slightly, and bolts to engage directly with the openings in one member and screwed into the other member and hold-the clamp together without the use of nuts. 7

3. A guy clamp formed of two members each of the members provided with bosses in the form of frustums of cones, and intermediate said bosses comparatively .weak portions, the bosses on one of the members being provided with interior screwthreads to cooperate directly with the screwthreads of the bolts, bolts to clamp the members together without the aid of nuts, whereby the greatest compression will be immediately adjacent the bolts and the least compression at apoint in the surface of contact equidistant between the bolts.

4. A guy clamp formed'of two members, each member having alternately rigid and comparatively flexible'or yielding areas, and means passing through the rigid areas to clamp them together.

g 5. A guy clamp formed of two members, each member having rigid portions in, the form of truncated cones whose bases lie in the bearing surface of said members, and comparatively flexible or yielding areas, between said cones, and means passing through the rigid portions to clamp the members together. i

6. A guy clamp formed of two members,

each member having rigid portions in the form of truncated cones Whose bases lie in the bearing surface of said members, and intermediate said rigid portions comparatively flexible or yielding areas, bolts pass-- ing through the rigid portions, the bases of said truncated cones being extended to span the weakened areas and to extend beyond the vertical axes of the Wire strand to be clamped, thereby transmitting the pressure of the bolt about the circumference of the strand With greatest force at a point nearest the center of said bolts, and With least force at a point equi-distant between the bolts.

7. A malleable iron guy clamp formed of two members, each having alternately rigid and comparatively flexible or yielding areas, and means passing through the rigid areas to clamp them together.

8. A malleable iron guy clamp formed of tWo members, each having alternately rigid portions in the form of truncated cones with their bases in the respective bearing surface of the members, and comparatively flexible or yielding areas between the rigid portions Whereby great bending limit is obtained, and means passing through the rigid portions to clamp the members together.

HENRYWV. PLEISTER.

Witnesses:

A. M. WILLIAMS, M. R. RYAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.