US2160892A - Pole or pile pulling device - Google Patents

Description

Patented June 6, 1939 PATENT OFFICE POLE OR- PILE PULLING DEVICE Samuel G. Neff, Fort Peck, Mont.

Application March 14,

2 Claims.

(Granted under the act of March amended April 30,

This invention described herein, if patented, may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

The purpose of my invention is to facilitate the pulling of poles, piling, etc., firmly imbedded in earth, by providing a mechanical device for connecting the pull cable to the upper end of the poles or piles in such manner that it cannot slip or pull loose; this device being so constructed that it can be easily and quickly attached to and detached from the poles or piles.

One form of the invention is illustrated in the accompanying drawing, in which Figure 1 is an orthographic projection of the device and Figure 2 a plan view.

The device consists of three lever arms I mounted on a triangular frame 2, of circular section, which frame-acts as axle and fulcrum for these lever arms; each arm I is connected to a gripping jaw 3 by means of plates 4, jaw pin 5, and cotter pins 6, and fitted at its outer or lifting end with shackle I and shackle stop 8.

Each gripping jaw 3 is segmental in plan and fitted on its inner face with lugs 9, beveled on their lower sides to form a cutting edge; 7 the outer face of each jaw 3 is fitted with plates 4 welded to it and connected with lever arm I by means of jaw pin 5; the top of the jaw assembly is fitted with a loop or eye I0, rigidly attached, and to this loop is attached a shackle I I.

The triangular frame 2 serves as a fulcrum or axle for each of the three lever arms I, mounted at the points of the triangle and held in place by shoulders I2 (welded to triangle); it also serves as a mounting or base for the entire assembly. The joint where the ends of the rod forming frame 2 meet, is welded as shown at I3. It is evident that when the outer ends of lever arms I are rotated upward on axle 2, the jaws 3 must move downward and inward, and, conversely, when lever arms I rotate downward, jaws 3 must move upward and outward; it is also evident that when an upward pulling power is applied to jaws 3 through loop I0, the movement of jaws 3 will be upward and outward.

Jaw pins 5 are made long enough to overhang triangular framel and thus serve as a stop to prevent the jaw assembly from dropping below the top of frame 2. Thus the three lever arms are held in such a position with relation to each other that their pressure on the pile or pole is equalized.

1938, Serial No. 195,888

3, 1883, as 1928; 370 0. G. 757) In operation, the entire assembly is lowered over the pile or pole by three wire cable slings I4, which are attached at their upper ends to the lowering line leading from the boom of the crane, the lifting or pulling line being slacked off during this period. Thus the jaws 3 are held apart to their maximum opening -by the upward pull of slings I4 and the weight of lever arms I, the outer ends of which, of their own weight, tend to rotate downward, thereby drawing the jaws apart. When the puller has been fitted around the pile or pole, the lowering cable is slacked off, transferring the weight to the lifting cable through the three cable slings I5.

It will be seen that as the weight of the assembly is transferred to the lifting cable through slings I5, the outer ends of lever arms I are pulled upward, thus forcing the jaws 3 inward to grip the pile or pole, and, further, that as pulling or lifting power is applied, this gripping action increases and forces the lugs 9 to bite into the pile or pole; any further power applied through the lifting cable is used in the operation of lifting. After the pile or pole has been pulled, it is released from the puller by taking up on the lowering line slings I4 and slacking off on the lifting line slings I5, thus causing jaws 3 to open and release the pile or pole.

I claim:

1. A lifting device of the class described comprising an equilateral triangular frame formed from a circular cross-sectional element, bell crank levers having interiorly and exteriorly extending lever arms fulcrumed at the intersection of the sides of said triangular frame, gripping elements pivotally connected to the interiorly extending lever arms, and operating slings connected to said gripping elements and to the exteriorly extending arms of said bell crank levers.

2. A lifting device of the class described comprising an equilateral triangular frame formed from a circular cross-sectional element, bell crank levers having interiorly and exteriorly extending lever arms fulcrumed at the vertices of said triangular frame, gripping elements comprising gripping jaws mounted on bearing plates pivotally connected to the interiorly extending lever arms, and operating slings connected to the gripping elements and to the exteriorly extending arms of said bell crank levers.

SAMUEL G. NEFF.

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