US401511A - naves - Google Patents

Description

(No Model.)

B. 1-1., NAVES. SNATGH BLOCK.

No.4011511. Patented Apr. 16, 1889.

INVENTOR,

UNTTnn STATES BENJAMIN H. NAVES, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO FRANCIS SHUBERT AND J OIIN O. COTTINGHAM, OF SAME PLACE.

SNATCH-BLOCK.

SPECIFICATION forming part of Letters Patent No. 401,511, dated April 16, 1889.

Application filed January 19, 1889. Serial No. 296,899- (No model.)

To aZZ whom it may concern:

Be it known that I, BENJAMIN H. NAVES, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Snatch:

Blocks, of which the following is a specification.

My invention has relation to snatch-blocks of the form having a vertically moving or sliding cross-head which has at its free extremity a hook-shaped end for engagement with a link hinged or swiveled to the front cheek-strap.

Heretofore, so far as I am aware, the sliding cross-head forms an integral part of the rear cheek-strap, which moves with the crosshead, said strap having at its lower end an elongated center-pin opening, and its upper end passes through a guide bracket or yoke secured to the rear cheek near its top. Such described construction is objectionable for the reasons that it is expensive to make and also to repair, as the strap and the guide yoke orbracketmust be more or less finished to fit one another, so as to admit of the strap sliding inthe guide yoke or bracket; that as the strap is separate from the rear cheek and only has the yoke or bracket connection therewith the said parts are not as strong nor as durable as is the case in blocks having the strap immovably secured to the rear cheek, and, finally, that under varying conditions of service the cheek and pin-bearings for the sliding strap form two series of contacting or bearing surfaces to rest together, fill up with dirt, snow, or ice, and make the strap more or less immovable at times, so that it and the crosshead are not always easily moved under all conditions of service.

My invention has for its objects to avoid all of the above-described objections, or, in other words, to simplify the construction of .said described snatch-blocks, so as to reduce the cost of manufacture and of repairs and to make a stronger and more durable snatchblock, the parts of which are easily and quickly adjusted or moved under all conditions of service.

My invention accordingly consists of the combinations, constructions, and arrange ments of parts comprising an improved snatch-block, as hereinafter more particularly described in the specification, and pointed out in the claims.

Reference being had to the accompanying drawings, Figure 1 is a front elevation of a met al-strapped wooden sn atch-block, showing the link raised and connected with the cross head of the snatch-block. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical transverse section showing in full lines the crosshead lowered and the link thrown down or dropped and in dotted lines the link and cross-l1ead connected. Fig. i is a sectional plan on line I I, Fig. Fig. 5 is an elevation of sliding cross-head and modified form of strap-connection therefor. Fig. (3 is an elevation of an iron or metal cheek and metal strap therefor for use in connection with my improvement. Figs. 7 and S are sectional views, partly in elevation, of a portion of one of the checks of a block and strap and crosshead therefor, showing modifications of construction of cross-head and strap support therefor; and Figs. 9 and 10 are similar views of additional modifications.

In Figs. 1, 2, and 3, A represents the snatchblock, comprising front and rear checks, to a, end piece, (1?, center pin, a, and sleeve or pulley a, all of the usual. or other suit. bleconstruction, of wood or metal, as desired. The rear cheek, to is higher than the front check, a, so as to leave an opening, a, above the latter for inserting the rope or cable a within and removing it from the mortise of the block. The front check, a, when made of wood, is equipped with, preferably, a double or bent strap, B, the top or loop portion, 1), of which projects above the top of the cheek a to form an eye or journal for a link, 0, and the two sides I) 11 of which pass, respectively, down the outside and inside of the check (a to below the center pin, a and are provided with suitable openings for the passage of said center pin, said sides 5 b of .the strap fitting in suitably-formed grooves in each side of the cheek a, and are inverted or otherwise connected, as is usual and as indicated.

To the inner side of the rear cheek, to, is correspondingly secured a strap, D, which may be a single strap having a center pin or openflush With that of the check a.

ing, d, as indicated more plainly in Fig. 3, or it may consist of a double strap, as indicated in Fig. 5. The top of strap D may project above the top of the cheek a, and in said top part of strap D is formed a vertical elongated slot, 01, through which loosely passes one end, f, of the cross head or bar F, having the usual swivel eye or hoop, f, at or near its center, and its free end f being of a hook-shaped or similarform, as shown. The end f of crosshead F, after being inserted in the elongated slot cl in strap D, is upset or otherwise provided with an enlarged extremity, f, as more plainly shown in Fig. 4, which is located on the outside surface of strap 1) and securely retains said cross-head in slot d of strap D, said head f for the end f of the cross-head F being so formed that it does not interfere with the free up-and-down movement of the crosshead. The cross-head F is vertically lowered to admit of engaging the link with or disengaging itfrom the hooked end f of cross-head. To admit of either inserting or removing the cable or rope from the mortise of the block, and when the cable or rope is inserted in the mortise of the block and the link 0 is engaged with the hooked end f of the cross-head, the cross-head, when vertically raised, holds the link firmly in position and closes opening 00 while the snatch-block is in use. When the block is not in use and the link 0 is out of engagement with the cross-head hook end f the link 0 falls down, as indicated in full lines, Fig. 3.

Such described construction of snatch-block admits of firmly securing the strap D to the rear cheek, a, and consequently elongated vertical center-pin openings in 4 said strap, and guide brackets or yokes therefor, to accumulate rust, dirt, snow, or ice under varying conditions of service, to make it more or less difficult to move the cross-head, are avoided. When the strap D is a double strap, as indicated in Fig. 5, one of the sides thereof may project above the top of the cheek, and in such projection is formed the slot d for the end f of the cross-head. When the rear cheek, to, is made of metal and strap D is connected thereto or usedin connection therewith, the slot d may be formed in the check a as well as in the strap D, as indicated in Fig. 6, in which case the top of the strap D is This same construction, if desired, may be applied to wooden cheeks. Again, if strap D is a double strap and has at its top a loop or bent part, as indicated at D in Figs. 7 and 8, an opening corresponding to the slot d is made in the bend of the strap for the reception of a vertically-depending end, f, of the crosshead F, having head f, to retain said end f in position in the strap-opening, and also the usual swivel eye or shank, f. In this described construction the strap-opening conforms to the transverse section of the crosshead depending end f, and it slides up and down in said openingthat is to say, the configuration of the opening in the bend of the double strap D is round, oblong, or otherwise, accordingly as the depending end f is round, oblong, or otherwise in cross-section.

In the construction shown in Fig. '7 the bend of the double strap D is flush with the top of the check a, and an opening is made in the latter for the play or movement of the cross-head depending end f. In Fig. 8, however, such cheek-opening is not required, for the reason that the bend of the double strap D extends above the top of the cheek-plate.

As the novel features of my invention can be variously-changed without departing from the spirit of the same, I do not confine myself to the specified constructions and arrangements herein shown and set forth. Thus, for instance, an opening, (1", corresponding to the opening cl, may be formed in the end f of the cross-head F and the upper end of the single or double strap used is provided with an enlarged or headed end for said cross-head to slide upon, as shown in Fig. 9; or, instead of providing the cross-head F with a swivel eye or hook, the cross-head may be configured to answer for both, as indicated at F in Fig. 10.

l/Vhat I claim is 1. A snatch-block having fixed strap D secured to and forming a part of one of its cheeks and a vertically-1novable cross-head at the top of said strap, having a hook-shaped free end, substantially as set forth.

2. A snatch-block having a strap, D, provided at its lower end with a circular sheavepin opening, and having at its upper end a separate sliding cross-head, F, withswivelhookf' and hook-shaped free end f substantially as set forth.

3. A snatch-block having opening at, a link, C, the strap D, and a separate sliding crosshead, F, on strap D, said cross-head having a hook-shaped free end for link 0, substantially as set forth.

at. In a snatch-block, the link 0, combined. with a vertically-moving cross-head, F, separate from but secured to a strap, D, substantially as set forth.

5. A snatch-block having a fixed strap, D, provided at its upper portion with a slot or opening, 61, a cross-head, F, having a hookshaped free end, f an opposite end, f, terminating in an enlargement, f and said end f engaging with said slot 61, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

BENJ. H. NAVES.

Vitnesses:

S. J. VAN SrAvoREN, CHAS. F. VAN HORN.

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