US765475A - Snatch-block. - Google Patents

Description

SNATGH BLOCK.

` A1 PLIO.A.AT10Nl FILED MAR. 5. 1904.

N0 MODEL.

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will I Il Patented .Tuly 19, 1904.

PATENT OEEICE.

JOHN E. GILOHRIST, OF SOUTHBEND, WASHINGTON.

SNATCH-BLOCK.

SFECIFICATION forming part of Letters Patent NO. 765,475, dated July 19, 1904.

Application filed March, 1904. `Serial No. 196.684. (No model.)

T MZ whom t may concern:

Be it known that l, JOHN E. GILcHEis'r, a citizen of the United States, and a resident of Southbend, in the county of Pacific and State of Washington, have invented a new and Improved Snatch-Block, of which the following is a full, clear, and exact description.

My invention relates to snatch-blocks, and more particularly to those designed for use in logging. Its principal objects are to provide such a device which will be both light and strong and which will prevent the coacting cable from fouling or straining the shell of the block.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding' parts in all the figures.

Figure 1 is an end elevation of one embodiment of my invention. Fig. 2 is a similar view with the hinged portions separated. Fig. 3 is a side elevation looking from the upper side of Fig. 1. Fig. tis atransverse sectional detail showing the oil-reservoir, and Fig. 5 is a perspective view of the bridge member.

S designates a shell or frame composed of opposite sections or cheeks O, the inner element of which consists of a plate 10, which may be of comparatively thin or sheet metal cut to the desired form and having its sides rounded or turned inwardly at 1l. At one extremity of these members are curved ends or tongues 12, which when the sides are assembled overlap one another and are provided with registering openings, through which extends a bolt 13 for securing them together. At the opposite end from these tongues are squared and preferably straight edges 13u. The other element of each section consists of an outer member 11i, which may be riveted to the plate and may be of sufficient thickness to furnish proper engagement for reduced ends of a transverse pin 15, the enlarged central portion 16 of which lies between the cheeks, spacing them apart, it being held in place by nuts 16 upon its outer threaded ends. Upon this pin is journaled a sheave 17, preferably grooved at 18 to receive a rope or cable 19, which engages the groove on the side of the sheave which lies substantially iiush with the edge 13a of the shell. Upon each member 11i adjacent to the squared `edge of the shell are separated lugs 20 20,

which upon one of the shell-sections serve as a hinge for a bridge member 21, connected thereto by a hinge-pin 22, extending through a perforated lug 23. A Similar lug upon 'the opposite side of the bridge cooperates with the pair of lugs upon the opposite shell-section and may be separably secured thereto by a removable pin 2li, conveniently fastened to the blockby a chain 25.

The bridge member is preferably formed of an integral piece of comparatively heavy metal rising upwardly at each side of the shell l and being connected at the top by a cross-bar 26, to which is attached a swivel 27 for connecting the chain 28.

Tithin the bridge between its opposite sides and with its lower ends closely adjacent to the edges 13 of the shell and to the periphery of the sheave is a curved guide 29, having its inner edges near the sheave rounded at 30 and being secured to the bridge by screws 31. With the groove in the sheave it forms a passage of rounded or substantially circular contour, conforming to the outside of the coacting cable.

As here illustrated, the sheave is cored outto form an annular recess or receptacle 32, having an opening through the periphery, which may be closed by a screw 33, and an inner opening leading to the journal upon which it rotates. In this latter opening is shown a plug' of wicking or other fibrous material 34, wound upon a wire 35, extending into the peripheral opening. The receptacle may be supplied with a suitable quantity of oil, and this iiowing gradually through the wicking will lubricate the journal for a considerable time. I

It will be seen that the shell of my improved snatch-block may be constructed quite lightly and yet be of considerable strength, since its sections are effectually stayed or secured by the integral bridge member, which holds them .together and prevents springing in a manner which would not be possible if it were itself made in a plurality of connected parts. Moreover, the guide member maintains the cable IOO in proper coaction with the groove in the sheave and prevents its exerting strain against the side of the shell or bridge when the block is picking up after the cable has slackened. This continued engagement of the cable with the groove prevents the former from being frayed, this being further aided by the fact that the only other edges with which it is liable to contact (those of the inner portion of the guide) are rounded. It' it is desired to release the cable from the block, this may be done conveniently if said cable is without slack, since the proximity of the periphery of the sheave to the upper edge 13 of the Vshell permits it to be readily disengaged.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A block comprising a shell formed in two sections having overlapping ends, a sheave carried between the sections, and a bridge connecting the sections.

2. A block comprising a shell formed in two sections having curved ends provided with openings, a bolt passing through the openings, a bridge connecting the sections, and a sheave carried between the sections.

3. A block comprising a shell formed in two sections having' overlapping ends, a sheave carried by the sections, and an integral bridge hinged to one section and separably connected with the other section.

4. A block comprising a shell having opposite sections, a sheave carried between the sections, a bridge connecting said sections, and a guide mounted upon the bridge and eX- tending between the sections.

5. A block comprising a shell having opposite` sections` a sheave carried between the sections, a bridge connecting said sections,and a guide mounted upon the bridge and extending between the sections, said guide having rounded edges adjacent to the shell-sections.

6. A block comprising a shell, a sheave carried by the shell with a portion of its periphery approaching closely to the edge of said shell, a bridge hinged to the shell at one side, and means for separably securing the bridge to the shell, their separation leaving the edge of the sheave and the shell substantially Hush tnd furnishing an uninterrupted space for reease.

7 A block comprising a shell, a sheave carried by the shell with a portion of its periphery approaching closely to the edge of said shell, and a bridge hinged to the shell at one side adjacent to its point of approach and separably secured to the shell at the opposite sic e.

8. A block comprising a shell, a sheave carried by the shell with a portion of its periphery approaching closely to the edge of said shell, and an integral bridge hinged to the shell at one side adjacent to its point of approach and separably secured to the shell at the opposite side.

9. A block comprising a shell, a sheave carried by the shell with a portion of its periphery approaching closely to the edge of said shell, a bridge hinged to the shell at one side adjacent to this point of approach and separably secured to the shell at the opposite side, and a guide mounted upon the bridge and extending across the sheave.

In witness whereof I have signed my name to this speciiication in the presence of two sub- 7 5 scribing witnesses.

JOHN E. GILCHRIST.

Vitnesses:

M. D. EGBERT, H. A. HILL.

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