US831460A - Snatch-block. - Google Patents

Description

PATENTED SEPT.18, 1906.

G. NETTLE. SNATCH BLOCK.

APPLICATION FILED JAN. 4, 1906.

2 SHEETS-SHEET l.

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No. 831,460. PATENTED SEPT. 18, 1906. G. NETTLE. SNATOH BLOCK.

APPLICATION FILED JAN. 4, 1906.

2 SHEETS-SHEET 2 UNITED sTATEs PATENT oEEIoE.

GUSTAV NETTLE, OF LEABURG, OREGON.

SNATCH-BLOCK.

Specification of Letters Patent.

Patented Sept. 18, 1906.

Application filed January 4, 1906. Serial No. 294.606. I

To all whom it may concern:

Be it known that I, GUsTAv NETTLE, a citizen of the United States, residing at Leaburg, in the county of Lane and State of Oregon, have invented certain new and useful Improvements in Snatch-Blocks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to what are known as snatch-blocks for pulleysthat is, blocks so constructed and arranged that the swinging cross-head thereof may be thrown back on its pivot to receive the bight of a rope, chain, or cable without the trouble and annoyance of reeving the end throughbut more particularly to logging-blocks for use in logging-camps with engines and cables. Among the other uses for which my device is well adapted are for elevators and ferries.

Generally stated, the object is to provide an improved, novel, and simple form of such blocks.

Another object is to construct the device'of my invention of a minimum number of parts, which shall be extremely inexpensive to manufacture. In many constructions where logging is done with engines the pulley of the block turns on a pin, and in spite of utmost care and careful oiling friction cannot be overcome, and the pin frequently burns out. By the peculiar formation of my device binding and friction of the working parts are reduced to a minimum, ninety per cent. of usual friction bein eliminated, and there is a saving of seventy-five per cent. of lubricant, twentyfive per cent. of wear on the cable, and twenty five percent. ofpower required. In many constructions also the full weight or tension of the cable on the pulley comes on the block carrying the pulley.

Another object, therefore, is to relieve the block of my device of such strain, and I effect this by providing a novel form of straps (hereinafter described) which receive the strain of the line or cable. I am also enabled by the use of my strap to raise one face or jaw of the block to fill the lubricant-chamber, if necessary, while the line or cable is .tight on the pulley and without any danger of the pulley becoming disengaged from and falling out of I the block.

Moreover, the object of my invention is to improve the general and specific construction of the device forming the subject-matter of my Patent No. 779,437.

In my present device the specific improvements and differences over my patented structure reside, among others, in the particulars noted, as follows:

First. I form the front (or each) jaw, shell, or frame-plate of the block with an extended cut-away portion for the reception of a strap and with a transverse securing-strip extending transversely of the cut-away portion and the jaw, all for purposes hereinafter appear- H10.

Second. I form the sheave or pulley with a central countersunk portion on each of its front and rear surfaces, for a pur ose hereinafter appearing. Also instead 0 having the exits of the oil-holes in the raceway of the antifriction-balls (as in my patenteddevice) I form the exits at the countersunk portions of the pulley, thus preventing the oil-holes being stopped up by dirt, dust, &c., as they would when their exits are in the raceway,

and I provide efiicient means for protecting the oil-holes from entrance of outside dirt and dust and for reventing the oil from running out onto t e exterior surfaces of they block, all as hereinafter explained.

Third. I form the cone disposed in the central opening of the sheave or pulley with removable bushings or sleeves, the object of these removable sleeves or bushings being to overcome wear on the cone, the sleeves by being removable being capable of being re- .placedwhen worn by new ones at very little ,=cost. 7

With these and other object in view the invention consists in and comprehends the novel construction, combination, and ar ,rangement of parts of a device characterized by my invention, as hereinafter fully described in the specification, summed up in the claims, and illustrated in the drawings.

In the accompanying drawings, Figure 1 is a front elevation of my device, the swinging cross-head when thrown up for insertion of a loop or bight of rope without the necessity of having to reeve the end through being indicated in dotted lines. Fig. 2 is a side elevation of my device, the front jaw being thrown open and upward for the purpose of permitting filling of the oil or lubricant chamberi n 8 is a detail view of the axle-pin of my device. Fig. 9 is a vertical transverse section rial, preferably through my sheave with the cone therein.

Referring in detail to the drawings, the block, as shown, comprises two jaws, shells, or frame-plates A A, of any suitable mate- H of some metal, such as iron or steel, and of the shape shown, by preference with a substantially circular or bulged lower portion and a reduced neck-like upper V portion terminating in end knobs a a.

rom the top of the front jaw A to a point I desirably below the center of the bulged be similarly cut away, if desired.

V pulley lower portion I cut away the jaw, as shown at a In this instance the front jaw only is so cut away; but the other jaw A may also Extending transversely of the face or front jaw A and desirably disposed toward the top of the bulged portion thereof and extending across the cut-away portion is a retainingstrip a provided midway of its ends with an opening a.

Adapted to be disposed in and exactly to fit the cut-away portion a is a strap (L provided with a perforation a registering wit the opening a and with two end knobs (1 the strap between the knobs being cut away, as at a A headed pin a is screwed transversely through the alining openings a a thus temporarily holding the A and the strap a against independent movement. A bolt (1 passes transversely through the strap a and the plate A, and a nut a screwed on each end of the bolt, clamps together the jaw A and the strap a In the cut-away portion a is adapted to fit one end of a swinging cross-head a, the other end fitting in a similar cut-away portion a of the rear or back jaw A, the swinging cross-head carrying the usual strong swiveled hook, eye, or ring B. A removable dowel-pin a passes through the various knobs, as shown, affording pivotal action of the jaws on such dowel-pins.

Supported between the two jaws A A is a or sheave O, which may be of any suitable material, such as steel or iron, casehardened and tempered, and has the usual central opening C and is provided on each face with similar countersunk portions 0 and (preferably on one face only) with a series of screw-plugs c, disposed in openings or passages c leading to an annular lubricantchamber 0 located internally and concenj trically of the pulley and whereby the lubrij cantchamber may be supplied with suitable lubricant, a number of these screw-plugs be mg provided, preferably so that the lubricant-chamber may be filled at any time, no matter what may be the position of the pulley, by simply unscrewing one of the headed pins a and swinging up and back the jaw A on its pivot dowel-pin, as shown in Fig. 2. Inclined passages 0 lead from the internal lubricant-chamber and have their exits c in the countersunk portions 0, grooves leading thence to the edge of and emptying into the opening 0. The wall of opening C is hollowed or dished out, as shown at 0 to form part of a raceway for the antifriction balls or rollers hereinafter described.

Adapted to occupy the opening 0 of the sheave is a cone formed in two sections or members, one member, constituting the top section, comprising a circular plate D, provided with a central opening d and an internal-threaded neck portion (1 surrounding the opening (1. Surrounding the neck (1 is a removable bushing or sleeve (i at the top downward and outward beveled, as at d.

the base-section, comprises a similar circular plate D, provided centrally with a circular offset portion d terminating in a reduced externallythreaded neck (1 to engage the internally-threaded neck (1 of the other member, a square opening 61 being drilled through the plate, the circular offset portion, and the neck, as shown. Surrounding the circular offset portion d is a removable bushing or sleeve (i at the top downward and outward beveled, as shown at d". When the two sections of the cone are screwed together, the bevels d and (1, together with the dishedout portion 0 of the sheave, constitute a raceway for antifriction balls or rollers (1 To assemble the cone with the sheave, the base member of the cone is inserted in the central opening C of the sheave and the balls inserted around the raceway. The other member of the cone is then screwed down upon the base member, preventing falling out of the balls.

The bushings or sleeves 0Z d are made re movable, so that they can be replaced as worn by new bushings at very little cost, and these bushings are valuable as overcoming wear which would otherwise come on the cone. Therefore the bushings are an impor tant feature of my present invention.

It will be noted that the plates or flanges D D of the cone rest in the countersunk portions 0, covering the oil-exits c and the oilgrooves 0 preventing entrance of outside dirt and dust thereto. This also is another valuable feature of my invention.

As shown in Fig. 8, the axle-pin a is square in cross-section. This pin, supporting the cone by passing through the central The other member of the cone, constituting gether extend slightly beyond the level or plane of each face-surface of the pulley or sheave, so that when my device is in operative position the strap or straps a (where two are employed) rest on the flanges D D, thus giving the pulley free movement or play at all times and obviating any possible binding. In the devices of many patents there are no means shown or provided to stay the shells apart when in position, so that when a heavy weight is placed on the rope passing over the pulley in these previous constructions it causes the shells to bear in upon the pulley, binding it so tightly as to prevent turning or rotation thereof with any degree of ease and facility. My peculiar construction remedies this difficulty.

The wear strap or straps a form a valuable feature of my invention, as they receive the strain of the line or cable, which would otherwise come entirely on the jaws of the block.

- Various minor modifications in the nature of detail will readily suggest themselves to those skilled in the art; but all such slight changes not involving a departure from the spirit of my invention come clearly within the scope and purview'thereof.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a snatch-block, two jaws, provided each with a long opening or slotvcut transversely therethrough and extending from the top toward the bottom thereof, straps or plates fitting in said openings, and means for holding the jaws spaced apart.

2. In a snatch-block, two jaws, provided each with a long opening or slot therethrough, extending from the top toward the bottom thereof, straps or plates fitting in said openings, and means for holding the jaws spaced apart, such means also holding together the jaws and the straps.

3. In a snatch-block, two jaws, provided each with a long opening or slot therethrough, extending from the top toward'the bottom thereof, straps or plates fittingin said openings, and means for holding the jaws spaced apart, such means also holding together the jaws and the straps and permitting pivotal movement of the jaws thereon.

4. In a snatch-block, two jaws, provided each with a long opening or slot therethrough, extending from the top toward the bottom thereof, straps or plates fitting in said openings, and means for holding the jaws spaced apart, such means also holding together the jaws and the straps and permitting pivotal movement of the straps thereon.

5. In a snatch-block, two jaws, provided each with a long opening or slot therethrough, extending from the top toward the bottom thereof, straps or plates fitting in said openings, and means for holding the jaws spaced apart, such means also holding together the jaws and the straps and permitting pivotal movementthereon ofsaid jaws and straps.

6. In a snatch-block, two jaws provided each with a long opening or slot therethrough, 1

extending from the top toward the bottom thereof, straps or plates fitting in said openings, means located at the top of the jaws and the straps for spacing the jaws apart, such means also holding together the jaws and the straps, and additional means, located below and independent of the firstmentioned means, for temporarily securing the jaws and the straps against independent movement.

7. In a snatch-blook, two jaws, provided head, the jaws and the straps for holding together the jaws and the straps relative to the cross-head, and constructed to permit pivotal movement of the jaws and the straps thereon.

9. In a snatch-block, two jaws, provided each with a long opening or slot therethrough, extending from the top toward the bottom thereof, straps or plates fitting in said openings, a swinging cross-head for spacing the jaws apart, and means engaging the crosshead, the jaws and the straps for holding together the jaws and the straps relative to the cross-head, and constructed to permit independent'pivotal movement of the jaws and the straps'thereon.

- 10. In a snatch-block, two jaws, provided each with a long opening or slot therethrough,

:extending from the top toward the bottom thereof, straps or plates fitting in said openings, a swinging cross-head for spacing the jaws apart, and a dowel-pin passing through the cross-head, the jaws and the straps.

11. In a snatch-block, two jaws, provided each with a long opening or slot therethrough, extending from the top toward the bottom thereof, straps or plates fitting in said openings, a swinging cross-head for spacing the IIO jaws apart, means engaging the cross-head, the jaws and the straps for holding together the jaws and the straps relative to the crosshead, and constructed to permit pivotal movement of the jaws and the straps thereon, and strips or bars disposed transversely of and secured to the jaws and constructed to permit temporary clamping of the jaws and the straps against independent movement.

12. In a snatch-block, two jaws, provided each with a long opening or slot therethrough, extending from the top toward the bottom thereof, straps or plates fitting in said openings, a swinging cross-head for spacing the jaws apart, means engaging the cross-head, the jaws and the straps for holding together the jaws and the straps relative to the crosshead, and constructed to permit pivotal movement of the jaws and the straps thereon, strips or bars disposed transversely of and secured to the jaws, the straps and thetransverse strips being provided with alinin openings, and means passing through sai openings for temporarily clamping the jaws and the straps against independent movement.

13. In a snatch-block, two jaws, provided each with a long opening or slot therethrough, extending from the top toward the bottom thereof, straps or plates fitting in said openings, and provided with openings therethrough near their lower ends, a swinging cross-head for spacing the jaws apart, means engaging the cross-head, the jaws and the straps for holding together the jaws and the straps relative to the cross-head, and means passing through the openings in the lower ends of the straps for temporarily securing them a ainst independent movement.

14. n a snatch-block, two jaws carrying a pulley and provided each with a long opening or slot therethrough extending from the top toward the bottom thereof, said pulley being provided with a central opening and with countersunk portions, in each face, adjacent to said opening.

15. In a snatch-block, two jaws carrying a pulley and provided each with an extended opening or slot therethrough running from the top to a point toward the bottom thereof, said pulley being provided with a central opening, with countersunk portions, in each face, adjacent to said opening, and with an internal lubricant-chamber.

16. In a snatch-block, two jaws carrying a pulley and provided each with a long opening or slot therethrough extending from the top to a point toward the bottom thereof, said pulley being provided with a central opening and with countersunk portions, in each face, adjacent to said opening, and a ball-bearing cone disposed in the central opening of the pulley. V

17. In a snatch-block, two jaws carrying a pulley and provided each with a long opening or slot therethrough extending from the top to a point toward the bottom thereof, said pulley being provided with a central opening, and a ball-bearing cone disposed in the central opening of the pulley and provided with flanges adapted to fit in the countersunk portions.

18. In a snatch-block, two jaws carrying pulley and provided each with a long opening or slot therethrou h extending from the top to a point towar the bottom thereof, said pulley being provided with a central opening and with countersunk portions, in each face, adjacent to said opening, and a.ballbearing cone disposed in the central opening of the ulley and formed in two sections, and provided with flanges adapted to fit in the countersunk portions of the pulley.

19; In a snatch-block, two jaws carrying a pulley and provided each with a long opening or slot therethrough extending from the top to a point toward the bottom thereof, said pulley being provided with a central opening and with countersunk portions, in eachface, adjacent to said opening, and a ball-bearing cone disposed in the central opening of the pulley and formed in two sections, and provided with flanges adapted to fit in the countersunk portions of the pulley, each said section of the cone being provided with removable bushings or sleeves on which the balls run.

20. In a snatch-block, two jaws carrying an automatic, self-lubricating pulley and provided each with a long opening or slot therethrough extending from the top to a point toward the bottom thereof, and straps or plates fitting in said openings, said pulley being provided with a central opening and with countersunk portions, on each face, adjacent to said central opening.

In testimony whereof I afiix my signature in the presence of two subscribing witnesses.

GUSTAV NETTLE.

Witnesses OBEL OBRIEN, FELIX SPARKS.

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