US733239A - Tackle-block. - Google Patents

Description

T. E. MADDUX. TACKLE BLOCK.

APPLICATION FILED NOV. 1. 1902.r

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PATENTED JULY 7, 1903.

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UNITED STATES Patented July 7, 1903.

THOMAS E. MADDUX, or GOLDBAE, WASHINGTON'.

TAGKLE-BLOCKL SPECIFICATION forming part of Letters Patent No. 733,239, cia-eed .my 7, 1903.

Application liled November l, 1902. Serial No. 129,664. (No model.)

To MZ whom it may concern:

Be it known that I, THOMAS E. MADDUX, a citizen of the United States, and a resident of Goldbar, in the county of Snohomish and State of lVashington, have invented a new and Improved Tackle-Block, of which the following is a full, clear, and exact description.

This invention relates to single-sheave blocks, and particularly to a class known as snatch-blocks, used to change the direction of pulling strain of a draft-cable while hauling logs or timber overland from one point to another.

The object of my invention is to provide a tackle-block of the class indicated with novel details of construction that adapt it for the free reception of the tackle rope or cable at any point between the ends of the latter, afford a very light, strong, durable, and inexpensive block which permits the sheave to be readily removed, provides a substantial removable pintle-bolt for the support of the sheave, and adapts said bolt to hold one of the hinged side walls of the shell of the block in closed adjustment, but permits its convenient release as occasion may require.

The invention consists in the novel ccnstruction and combination of parts, as is hereinafter described and defined in the appended claims.

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 l is a side view of the improved tackle-block in closed condition. Fig. 2 is a transverse sectional view substantially on the line 2 2 in Fig. l; and Fig. 3 is a partly sectional viewof the block, showing the parts in open adjustment.

The shell of the block consists of two flat side plates or cheeks 5 5, having a substantially ovate form on their edges, as shown in Fig. l. Upon each side plate or cheek a strap G is secured by rivets, these straps of like form extending lengthwise of the side plates or cheeks. Two hinge-leaves (5 are formed on the upper end or head portion of each strap G, said hinge-leaves being spaced apart at the transverse center of said strap for the reception of a leaf 7 on a corresponding end of a yoke-bar 7.

As shown, the yoke-bar consists of a metal block having a leaf 7 formed on each end, the thickness of said leaves adapting them to respectively fit between a pair of the leaves 6, as before mentioned, and be thereon pivoted by a rivet-bolt 8,' neatly fitted in central alined perforations in each pair of jointleaves 6n and the leaf 7, which is inserted between them.

At the longitudinal center of the yokebar 7 an eyebolt D is swivel-connected thereto by means of the loosely-fitted shank 9thereon, which is passed down through a perforation in the bar and held to turn therein by riveting the projecting lower end, so as to form a radial flange thereon, as shown in Fig. 2. A grooved sheave-wheel l0 is provided, which is centrally perforated to receive the cylindrical body of the pivot-bolt ll.

The pivot-bolt is formed at one end with a square head l1 of suitable dimensions, and from said head extends the cylindrical body 1l, which is loosely inserted within the perforation of the sheave l0.

The bolt-body is reduced in diameter, so as to pass neatly through a central perforation in the side plate or cheek 5 and strap 6, toward which said bolt projects, and to permit a free rotation of the sheave l0 on the bolt-body the shoulder a, where the bolt-body is diametrically'reduced, bears on the side plate 5, solas to afford space between the head ll and said side plate sufficient in width to allow a free rotation of the sheave l0 when the bolt is held in place on said plateand strap. The end portion of the bolt is extended beyond the strap,through which it passes, and is threaded for the reception of a nut l2, which when screwed on the bolt so as to impinge forcibly upon the strap G serves to secure the bolt in place on the side plate or cheek 5 and strap 6.

A square orifice b is formed in the center of the strap 6 and tlie'side plate or cheek 5a, opposite the side plate and strap, wliereon the bolt is firmly secured, and said angular oriiice is so relatively positioned that it will freely receive the head 1lil when the latter has its sides disposed parallel with corresponding sides of the orifice, it being understood that lthe bolt-head is slightly smaller than the oritice it occupies. A The bolt-head 1ln projects sufficiently out- IOO side of the side pla-te 5n and the strap thereon to permit the formation of a perforation c therein that is adjacent to the outer surface of the strap on the plate 5 when said strap and plate are fully folded over the head so as to dispose the plate or cheek in loose contact with the adjacent side of the sheave l0.

A pin or preferably a split key, such as 13,

y (shown in Figs. l and 3,) is passed for aportion of its length through the perforation c when the side plate 5 is fully folded over the bolt-head il, and then the two members of said key are spaced apart, which removably secures the key in place.

To prevent the loss of the key, a small chain la or other available flexible connection is connected by one end to the bow end of the key and at the opposite end is secured upon the strap 6 on the side plate 5a, the chain having' sufficient length to permit the free insertion of thevkey 13, as before explained.

In the head Il and the body of the pivotbolt l1 an oil-passage d is formed, as shown in Fig. 2, this passage enabling the free lubrication of the sheave l0 and the body of the pivot-bolt as may be necessary to insure the free working of the sheave on the pivot and also between the sides of the wheel and plates or cheeks 5 5,

It will be seen that the application of the snatch-block upon a draft-cable to chan gc the direction of pull of the latter at any point between its ends may be readily made by the removal of the key 13, which will permit the side plate 51 to be swung laterally and the yoke-bar 7 rocked on the strap G, fixed on the side plate 5, which will freely expose the upper edge of the sheave l0 for the reception of the cable. (Not shown.)

As the split key13 may be quickly removed by pulling upon the chain 14, it will be evident that when this is done the release of the cable from the block may be expeditiously effected and the cable removed by simply pulling the block sidewise, so as to press the cable against the released side plate 5a, which will swing the latter outwardly into the position represented in Fig. 3.

It will be seen that the position of the yokebar '7 and the secured pivotal attachment thereon of the side plates 5 5n by means of the straps o' 6, having hinge-leaves G and the riveted pivots S, that engage said ears, together with the ends of the yoke-bar, aords a very reliable means for opening the block, as already described, this being one feature of the improvement. Y

The provision of the removable headed pivot-bolt Il, which connects the sheave 10 with the side plate 5 in a manner that permits the free rotation of the sheave-wheel on said bolt-body, is another detail ofthe invention.

The provision of a shoulder a on the pivotbolt 11 at the base of the thread thereon and which seats upon the side plate 5 when the nut l2 is forcibly drawn against the strap 6 It will be seen that the formation of the angular head lln on the pivot-bolt Il and the engagement of said head by the side plate 5r and strap (S when the head is passed through the angular perforation in the plate and strap adapts the latter to hold the pin from turning or becoming loose on the side plate 5.

In case the body of the pivot-bolt ll is rendered untrue where itis most forcibly pressed upon by the sheave lO, which obviouslyris the side of the bolt nearest the yoke-bar 7, the pivot-bolt may be turned one-fourth of a revolution by applying a wrench to the head Il after slackening the nut l2, which will present a true surface of the bolt -body for engagement with the sheave at the point where the greatest wear is.

After the head 1l:l of the bolt is turned as described it will be adapted to receive the side plate 511 and the strap 6, having the angular perforation therethrough, and when so adjusted the bolt should be firmly secured on the side plate 5 by a proper adjustment of the nut 12.

It will be seen that as the head 1l of the bolt is four-sided it may receive three successive adjustments after wear on the pivot-bolt body renders this change of position necessary. This provision is also a novel feature of the improved snatch-block.

Having thus described my invention, I `claim as new and desire to secure by Letters Patent l. In a tackle-block, the combination of a cheek-plate movable relatively to the swivelbar, a wheel rotatably secured thereto, and a second movable cheek-plate adapted to be brought into parallelism with the wheel-carrying plate, the construction being such that the whe el will be interposed between the movable plates, substantially as set forth.

2. In a tackle-block, the combination of two cheek-plates, pivoted tobe movable outward relatively to the swivel-bar, a wheel carried by one of said cheek-plates, and means for locking the plates in approximately a position of parallelism, substantially as set forth.

3. In a tackle-block, the combination of a swiveled bar, a swinging cheek-plate pivoted Y to said bar, a wheel, a second swinging cheekplate pivoted to the swiveled bar, and means passing through the two cheek-plates and the wheel for locking said plates in parallelism and permitting the wheel to be revolved between said plates, substantially as set forth.

4. In a tackle-block, the combination of a swiveled bar, two cheek-plates pivoted to said bar in such manner that the plates may be moved outward relative to each other or ICO IIO

vanse' brought into parallelism, a grooved wheel, and a bolt passing through the cheek-plates and the wheel, the construction being such that the plate will be locked in parallelism and the grooved Wheel may revolve freely between said plates, substantially as set forth.

5. A tackle-block comprising two cheekplates, a strap on each of 4said cheek-plates, a yoke-bar hinged by its ends on each strap, a swiveled eyebolt mounted on the yoke-bar, a pivotbolt securable on one of the cheek-plates and one of the straps, a sheave-wheel rotatable on the pivot-bolt, said bolt having an angular head adapted to pass through a mating orifice in either cheek-plate and strap, and means for detachablyholding said cheek-plate and strap folded over the end of the pivot-bolt, substantially as set forth.

6. A tackle-block comprising two cheekplates, a strap secured on each cheek-plate, said straps having hinged leaves at their upper ends, a yoke-bar, the ends of the yolre-bar having hinged engagement with the straps on the cheek-plates, a pivot-bolt threaded on one end and shouldered on said end, such end passing through a` perforation in one of the cheek-plates and one of the straps, a bolt having an angular head,the other cheek-plate and strap having a mating angular perforation wherein the bolt-head firmly fits, and means for holding the cheek-plate and strap folded ovei the bolt, substantially as set forth.

7. ln a device of the character described,the yole-bar, the cheek-plates and straps therein hinged upon the yoke-bar, the pivot-bolt held on one of the cheek-plates by a nut, said bolt having a square head, the other cheek-plate and strap having a square opening wherein the head of the bolt loosely fits, and a split key adapted to pass through a transverse perforation in the head of the bolt for holding such cheek-plate upon said head.

8.' In a tackle-block, the combination of two cheek-plates, pivoted to be movable outward a horizontally disposed, wheel supporting member carried by one of said cheek-plates, a wheel carried by said member, and means engaging with the aforesaid member for locking the cheek-plates in approximately a position of parallelism7 substantially as set forth.

9. In a tackle-block, the combination of a swiveled bar, a swinging cl1eekplate pivoted to said bar, a horizontally-disposed Wheel-supporting member carried by the aforesaid cheek-plate, a second swinging cheek-plate pivoted to the swiveled bar, and locking means passing through the wheel-supporting meinber adjacent to the outer surface of one of said cheek-plates for locking the said cheekplates in parallelism, substantially as set forth.

lO. ln a tackle-block, the combination of a swiveled bar, two cheek-plates pivoted to said bar in such manner that the plates may be swung outward relative to each other or brought into parallelism, a bolt passing through the cheek-plates, a grooved Wheel supported on said bolt between the plates, an d a locking-pin adapted to pass through said bolt, the construction being such that the plates will be locked in parallelism and the grooved wheels may revolve freely through said plates, substantially as set forth.

ln testimony whereof l have signed my name to this specification in the presence of two subscribing witnesses.

THOMAS E. MADDUX.

lVitnesses: n

FRANK R. THOMSON, JNO. L. HALIHAN.

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