US2347361A - Load hoisting tong - Google Patents

Description

April 25, 1944. L, NELSON LOAD HOISTING TONG Filed May 11, 1943 Patented Apr. 25, 1944 UNITED STATES PATENT OFFICE LOAD HOISTING TONG Lee Nelson, Texas City, Tex.

Application May 11, 1943, Serial No. 486,591

2 Claims.

This invention relates to a load hoisting tong.

An object of the invention is to provide a tong of the character described specially designed for lifting heavy metal plates, beams and the like.

Another object is to provide a tong having spaced fixed clamp jaws provided with hearing faces on which are mounted wedge shaped slips for engaging the load with a lifting device for the tong which is operable against the slips to force them into secure engagement with the load.

With the above and other objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawing wherein:

Figure 1 shows a side view of the tong in engagement with the load.

Figure 2 shows an edge view.

Figure 3 shows a fragmentary, cross-sectional view taken on the line 3-3 of Figure 1.

Figure 4 shows an end view and Figure 5 shows a fragmentary cross-sectional view taken on the line 5-5 of Figure 1.

Referring now more particularly to the drawing wherein like numerals of reference designate the same parts in each of the figures, the numeral l designates the body as a whole having the integral clamp jaws 2, 2 provided with bearing faces 3, 3 which are spaced apart and which converge toward their free ends. Mounted on the faces are the wedge shaped slips 4, 4 which have a sliding, dove-tailed connection with the jaws 2. These slips are retained against detachment by means of the set screws 5 which are threaded through the jaws 2 and whose inner ends project into the longitudinal grooves 6 in the outer sides of the slips 4. The slips have the inside teeth I to engage the plate 8 or other load to be handled.

The body I has opposing slots, as 9, 9 out therethrough which are separated by the space block ID, secured in the body between them.

There are the lifting links H, l I fitted through the respective slots and pivoted to the body. The outer ends of these links are connected by the linkage l2, 13 to the lifting cable l4.

The inner ends of the links H are formed with cams I5, I5 which bear against the opposing ends of the slips 4, 4,

The links H, II are arcuate so that when the load is inserted between the slips and the tong is elevated the cams will force the slips downwardly along the bearing faces 3, 3 and into secure engagement with the load so that the load will be very securely held against dropping out thus reducing the liability of accidents from the falling of the load,

The weight of the load will be transmitted through the slips 4, the bolts l6 on which the links H are pivoted and on to the cable It thus relieving the clamp jaws 2 thus making it possible to form the body I of lighter construction.

The drawing and description are illustrative merely while the broad principle of the invention will be defined by the appended claims.

What I claim is:

1. A lifting tong comprising fixed clamp jaws spaced apart and having bearing faces which converge toward their free ends, wedge shaped gripping jaws mounted to slide on said faces to grip a load between them, a single link on each side pivoted to the fixed jaws and whose inner ends bear against the wide ends of the gripping jaws and lifting means connect the other ends of said links.

2. A lifting tong comprising a body having integral clamp jaws provided with bearing faces which are spaced apart and which converge toward their free ends said body having side slots, wedge shaped slips forming grip jaws mounted to slide on said faces to grip a load between them, arcuate links pivoted on the body whose inner ends project through said slots and form cams which bear against the wide ends of the slips, the other ends of saidlinks projecting beyond body and lifting means connecting said other ends whereby upon lifting movement said cams will act against the slips to hold them in secure engagement with the load.

LEE NELSON.

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