US2353479A - Hoist - Google Patents

Description

July 11, 1944. F. LOCK l 2,353,479

HOIST Filed Sept. 6, 1941 v2 Sheets-She a; 1

ATTORNEY July 11, 1944. F. L'OCK 2,353,479

HOIST Filed Sept. 6, 1941 2 Sheets-Sheet 2 INVENTOR ATTORNEY Patented July 11, 1944 UNITED STATES PATENT OFFICE HOIST Application September 6, 1941, Serial No. 409,770

1 Claim.

This invention relates to a hoist, and more particularly to a hoist of the type in which the load is elevated and lowered by a cable or wire rope that is wound and unwound by rotation of a drum.

Those skilled in the art fully appreciate that the capacity of a hoist of the class described may be changed by the simple manipulation of the cable or wire rope. Thus, when the load is directly suspended, as through a load block, by a single strand of wire rope, the hoist is adapted for a particular load weight. By removing the load block from the wire rope, and passing the wire rope about a load sheave, while securing the end of the rope to a fixed portion of the hoist, the capacity of the hoist is doubled. Thus, the load is now held suspended by two strands of rope, and is elevated at one half the speed with which the load is elevated when carried by a load block secured at the end of a single strand of rope.

My invention relates to novel means for readily securing the Wire rope to the load block, or to a fixed portion of the hoist, so that the hoist capacity may be changed quite rapidly and with great facility. The manufacturing and operating economies effected are quite obvious.

A further feature of my invention relates to the load block construction I have devised, whereby a quick connection may be made between the wire rope and the load block, and whereby the load hook may simultaneously be assembled to the load block.

I have outlined my invention in order that the operation and construction thereof to be hereinafter presented, may be more clearly understood. Naturally, the conception on which my invention is based, may be embodied in forms other than that which I shall hereinafter show and describe, so that my patent claim should not be unduly limited in scope.

Referring now to the drawings, Fig. 1 is a vertical view of a hoist illustrating the wire rope assembled to a load block, and as an alternative, passed about a load sheave and secured to a fixed portion of the hoist. Fig. 2 is a View taken of Fig. 1 looking in the direction of line 2-2. Fig. 3 is an exploded View showing the parts for securing the end of the wire rope or cable to the hoist. Fig. 4 is a cross section of the load block showing its construction. Fig. 5 is a view taken at right angles to Fig. 4 with parts broken away. Fig. 6 is a sectional view taken along lines 66 of Fig. 4.

Referring now more particularly to the drawings, and especially Fig. 1, there is illustrated there a hoist of the type in which a drum i0 is adapted to be rotated to wind and unwind a cable or wire rope ll, thereby lifting and lowering a load. This load may be supported by what I term a load block 12 shown in dash and dot lines, which is secured to the end of the cable II, and below the idler sheave i3 over which the cables passes in the particular structure. Those skilled in the art will appreciate; that in some hoists of this class, the rope will hang downward directly from the drum I8, and- With the load block substantially vertically disposed under the said drum.

When it is desired to double the load capacity of the hoist, the wire cable H is passed about a load sheave I i shown in full lines, the end of; the cable being first removed from the load block l2. Through suitably securing the end of the wire rope or cable II to what I term a fastener l5 pivoted through the bolt It to the plate i! of the hoist, I adapt the load for elevation at one half the speed at which it may be lifted by the load block modification, while at the same time doubling the load capacity.

I shall now describe in detail the construction of the fastener I 5 and the means whereby the end of the wire rope II is secured thereto. Re-' ferring now to Figs. 2 and 3, the fastener I5 is shown in the form, preferably, of a casting having a cylindrical vertical bore IS in the center thereof. The vertical bore I3 communicates with the outside face of the casting at one side through a vertica1 slot l9 extending the entire vertical length of the casting of the fastener'l5.. The vertical bore l8 communicates with the op posite face of the fastener l5 through a relatively short slot 251. The fastener is bored at 2| and 22 whereby it may be readily mounted on the fixed plate portion 11 of the hoist through the pivot shaft IS.

The vertical bore l8 terminates in a shouldered portion 23 at the lower end of the casting of the fastener l5, all for a purpose which shall be presently indicated. The wires at the end of the wire rope or cable 1! are adapted to be frayed or untwisted into substantially tapered position and then to be held in that tapered position by the addition of a metal cast there about, to form the substantially solid tapered end portion 24. Any suitable metal may be used for the particular purpose, zinc being generally preferred. A sleeve member 25 is inserted over the wire rope or cable ll, and has an interior tapered bore 25 which is tapered in complementary relation to the tapered end 24 of the rope. In actual practice, molten zinc may be poured directly into the sleeve 25 as the frayed or untwisted Wires of the cable are held within the sleeve. The tapered wire end 24 and the sleeve 25 are then integral. Those skilled in the art will now readily appreciate that if the sleeve 25 and the tapered end 24 of the cable are placed with the lower surface 2'! of the sleeve 25 against the shouldered portion 23 of the bore l8 of the fastener IS, the several parts will be retained in the position of Fig. 2 with the result that the wire rope will be held securely within the fastener Hi. The strength of the securing means will be considerable since those skilled in the art will fully appreciate that in order to release the rope by vertical pull thereon, it will be necessary to remove all of the metal which has been cast about the rope end to form the tapered portion 24.

The slot |9 in the fastener I serves partially as a means of entrance'of the cable or wire rope H, and partially to permit pivotal movement of the fastener |5 relatively to the pivot shaft H5. The short slot serves this last purpose. Those skilled in the art will now appreciate that to release the end of the rope I from the fastener l5, and to remove it therefrom, it is merely necessary tolift the tapered rope end portion 24 into the position shown in the exploded view of Fig. 3, after which the parts are readily separated. The rope may then be secured to the load block I 2 to reduce the load capacity of the hoist while increasing the speed of lifting and lowering of the load.

Referring now more particularly to Figs. 4, 5 and 6, I shall describe the means for securing the rope end to the'load block l2. The load block I2 is formed of two identically similar forgings or castings and 3| held together by bolts 32 and 33 as best illustrated in Fig. 6 and aswill be quite clear to those skilled in'the art. The heads of the bolts 32 and 33 are adapted to rest in countersunk portions 34, whereby not to disturb the symmetry of the outside of the load block and the streamlined appearance thereof. When the portions 30 and 3| of the load block are secured to one another as in Fig. 6, they act simultaneously to assemble relatively to the load block, the rope end 24 and the sleeve 25', as best illustrated in Fig. 4. There it will be noted that the load block has an internal cylindrical opening 35 formed with a shouldered portion 33 and terminating in a bore 3T. It will now be noted that in the assembled position of the parts, the sleeve 25 fits against the shouldered portion 36 of the opening 35 whereby to hold the tapered end 24 of the rope within the load block I2, and with the rope itself passing outwardly of the load block through the bore 31.

Simultaneously with the assembling of the rope end 24 relatively to the load block [2, a load hook 3B is also secured in assembled relation to the load block. The load hook 38 is formed with a shaft portion 39 which is threaded at 40 for cooperation with a retainer nut 4|. A ball bearing assembly, designated generally by reference numeral 42, is mounted in an opening 43 of a forging 44 in position to accept the downward thrust of the load hook 38 exerted through the nut 4| whereby to allow for relatively free rotation of the load hook 38 relatively to the forging 44.

The forging 44 is itself equipped with pins 45 mounted in bores 46 of the parts 30 and 3| of the load block, whereby to allow for free swinging movement of the forging 44 relatively to the load block I2 as illustrated best in Fig. 5 in dash and dot lines. It will be now readily observed that not only is the load hook 38 rotatable relatively to the load block through its mounting in forging 44, but it is also capable of pivotal swinging movement with the forging 44 about the pins 45, It will be also readily observed that when the load block portions 3!? and 3| are assembled to form a load block, they are simultaneously adapted to secure in assembled relation thereto the load hook forging 44 and the wire rope or cable I believe that the utility and novelty of my invention will now be quite readily appreciated by those skilled in the art.

I now claim:

In a suspended hoist of the class described, a frame, a winding drum mounted on said frame for winding and unwinding a wire load handling rope, a wire load handling rope wound on said drum and having its end untwisted and held in tapered. form by the addition of molten metal cast about the threads of said end, a sleeve comple menting the tapered form of said rope end, a pair of castings adapted to be bolted together to form a load block, said load block castings forming a cylindrical opening internal of said load block in communication with a relatively small bore leading to the outside of the assembled load block, said sleeve and rope end being housed in said cylindrical opening with said rope extending through said small bore, a housing member on said frame whereby to secure the end of said rope to the body of said hoist, said housing member having a slot for the sidewise entry of said wire rope therein, and a shouldered internal bore communicating with said slot into which said sleeve and rope end may be moved downwardly against the shoulder of said internal bore to be retained therein.

FRANK LOCK.

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