US1224148A - Sling. - Google Patents

Description

0. CROSBY.

SUNG.

APPLICATlON FILED NOV. 28, 1914.

1,224,148. Patented May 1,1917.

WM w: 3] mm W601,

OLIVER CROSBY, OF ST. PAUL, MINNESOTA, ASSIGNOB TO AMERICAN HOIST & DERRICK COMPANY, OF ST. PAUL, MINNESOTA, A COPARTNERSI-IIP CONSISTING 0F OLIVER CROSBY, FRANK J. JOHNSON, AND WILL 0} WASHBURN.

' SLING.

Specification of Letters Patent.

Patented May 1, 1917.

To all whom it may concern.

Be it known that I, OLIVER CROsBY, a citizen of the United States, residing at St. Paul, Ramsey county, Minnesota, have invented new and useful Improvements in Slings, of which the following is a specification.

This invention relates to improvements in slings of the type shown in my prior Patent No. 758,959 granted May 3rd, 1904, and has for its object the provision of a sling of stronger and more durable construction, and one in which a chain may be used in place of the rope or cable of my prior patent.

A further object of the invention is to provide a sling of this character in which the releasing hook is adapted to hold and release the chain either through the ring at the end of the chain or at any intermediate link of the chain. In prior slings of this character the releasing hook has been adapted only to engage the ring at the end of the chain or cable. Consequently should the ring be broken off the chain, the loading would have to be suspended until the chain could be repaired or a new one procured.

With the above objects in view my invention consists of the construction illustrated in the accompanying drawing wherein,

Figure 1 is a perspective view showing my improved sling with the chain engaging the releasing hook at an intermediate link;

Fig. 2 is an end view of the releasing hook; and

Fig. 3 shows the manner in which the ring in the end of the chain is engaged with the hook.

Referring now to the drawings the sling is preferably formed of two spaced side plates 1 between which is mounted at one end a roller 2 over which the end of the chain 4 by which it is suspended from the derrick is guided. Pivotally mounted adj acent the roller and also between the plates is a ratchet dog 3 which permits the chain to be drawn tight in the direction of the arrow but prevents its return movement until the bundle is discharged and the dog released.

At the other end of the plates 1 is a releasing hook 5 which holds the free end of the chain and permits its release when the bundle of cane is suspended to allow its discharge from the derrick.

The chain 4 is preferably provided with rings 6, 6 at each end and when in use one ring 6 is suspended from the derrick and the other 6 is hooked over the hook 5 and the portion of the chain between the hook 5 and the roller 2 may be drawn tight aroundthe bundle of cane to be raised. The hook 5 is held in the position shown in the drawings by means of a dog 7 as shown in dotted lines in Fig. 1, which engages the rear end of the hook to prevent its movement. The dog is provided on its upper face with a socket for the reception of the bar 8 to give the operator sufficient leverage for releasing the dog.

In operation with a new chain having a ring at each end the hook engages the ring in the ordinary manner of a hook, but as the rings are frequently lost in the rough handling t which the slings are subjected, it is highly desirable that the hook be able to engage the chain at any point of its length in such manner as to release it quite as readily as it releases the ring. To this end the hook 5 is formed with a central bifurcation 9 of a width to freely receive the link of the chain when laid edgewise between the prongs of the hook, but too narrow to permit the end of the next link being jammed in the space between the two hooks. The curved face of the hooks acting against the end of the link which is drawn hard against it by the weight of the load causes the link to project away from the hook so that the free end of the chain will free the hook when it is released quite as readily as the ring slips oif of the double hook.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

In a sling, the combination with a chain having links of substantially uniform size, each link normally extending in a plane at an angle to an adjacent link, a clamp slidable on said chain, a bifurcated curved releasing hook pivotally secured in the end of said clamp, said hook being pivoted at a point to one side of the middle point of its curve, the arms of said hook forming said bifurcation being spaced sufliciently far apart to freely receive a link of the chain when laid edgewise therebetween but sufficiently near together to prevent the entrance, of an adjacent transversely laid link,

between the arms so as to prevent jamming of said chain catching upon the point of 10 said hook is rendered negligible.

Signed at St. Paul, in the county of Ramsey and State of Minnesota, this 20th day of November, 1914.

OLIVER CRObBY. Witnesses:

O. W. MORTON, C. B. MORAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0.

Images