US898121A - Logger's wire-rope sheave-block. - Google Patents

Description

PATENTED SEPT. 8, 1908.

H. .1. LITTLER.

LOGGERS WIRE ROPE SHEAVE BLOCK.

APPLICATION FILED 13150.19, 1907.

MINESSES:

HENRY JAMES LITTLER, OF VANCOUVER, BRITISH COLUMBIA, CANADA.

LOGGERS WIRE-ROPE SHEAVE-BLOGK.

Application led December 19, 1907.

Specification of Letters Patent.

Patented Sept. 8, 1908.

Serial No. 407,251.

To all whom 'it may concern.'

Be it known that I, HENRY JAMES LITTLER,

citizen of the Dominion ojf Canada, residing at Vancouver, in the Province of British Columbia, Canada, have invented a new and useful Improvement in Lo gers Wire-Rope Sheave-Blocks, of which tie following is a specification.v

This invention relates to an im roved sheave block particularly designed or use with the wire rope of heavy log'hauls. The requirements of the work to which such a sheave block is exposed call for distinctive features in design. It requires to be strong to stand the heavy strain and rough usage to which such a block is subjected, While its Weight must be ke t within the smallest possible limits in or er to satisfy the require- I ment of portability in rough bush country; the width between the sides of the block requires to be considerably in excess of the diameter of the wire rope, in order to permit the passage of the choker hooks by which the lengths of rope are connected together,

Jandfacility must be aorded for eflicient lubrication while the block is lying on its llat and the lubricating means must be such as will not be subject to injury. These severaly requirements have been met in a satisfactory manner in the block which is the subject of this application,- as will be seen from the following specication which fully describes the invention, reference being made to the drawing; by which it is accompanied, in which:

igure 1 is a vertical section through the center of the block, and Fig. 2, is a section on the line A-A of Fig. 1. Fig. 3, is a section on the line B-B of Fig. 2. Fig. 3a, is a detail view hereinafter specifically referred to. i

In these drawings 2 represents the sheave which is of white iron of ample width having a chilled groove at the middle for the wire rope and flared flanges extending conically outwardly from it to lead the rope into the groove and support the choker hooks during their passage round the sheave.

The sheave is supported on a hollow cast iron pin 3 fitted and secured into the side plates 4, which side plates are cut from sheet metal and conform to the outer edge of 'the sheave and are carried beyond that outer edge toward the yoke. The sides plates 4 are flanged outward, as shown in Fig. 3a, adjacent to the path of the rope round the sheave to facilitate the passage of the choker hooks etc.

Riveted or otherwise secured to the outside of each side plate 4 is a strap plate 6, each of which is bent over outward as shown in Fig. 2 to form an eye 5 for the yoke connecting pin 7, and the bent over end is riveted through side plate and strap plate, the eye being slotted to admit the eyes of the loop member 1() and the com ression links 11 of the yoke. The design o this yoke is a distinctive feature of the block. The width of the sheave, and consequent distance apart of the side plates, necessitates a strong yoke to withstand the' tendency of the upperv edges of the side plates 4 to draw to ether wh n a heavy pull is imposed on t ie block. To withstand this tendency the yoke which connectsthe upper ends of the strap plates 6 and their attached side plates 4 is composed of a loop member 10'bent to an inverted V shape as shown, and havin eyes forthe reception of the pins 7 by whic the yoke'is connected to the eyes 5 ofthe strap plates, and extended directly between these eyes of the strap plates and yoke' member 10 are compression links 11, which are preferably inserted within the slots in the strap plate eyes one on each side of the yoke loop 10. The yoke pins 7 pass therefore through the eyes of the strap plates 6, the compression links 1l and the eyes of the yoke loop 10. This design of the connectin yoke forms a triangular structure theoretica ly'suitable to the strain imposed upon it and designed to transmit the pull applied. through the sheave and its side lates 4 to the apex of the loop 10 where the s eave is connected to its support, While resisting. the horizontal component of the diagonal pull of each side of the loop member.

To the inner side of each side plate 4 adjacent to the -edge of the sheave flange is secured a lip 12 designed to prevent anything getting between the sheave flange and the side plate.

As previously stated the hollow pin 3 on Whichthe sheave runs is fitted into the side plates 4 which are bored to receivev it and the strap plates 6 to which the side plates 4 are secured are drawn up against the ends of the pin 3 by bolts 13 whlch pass through the holow of the pin.

The pin 3 is cast with an inner cylinder 14 toward one end andconnected to the outside -shell by webs .15 and has an oil hole 20 to the sheave bearing toward the up er end and this cylinder 14 is bored to rece1ve a plunger 16 into which is threaded as into a nut a screw 17. The plunger 16 is prevented from rotation b lugs 16X which asl the screw 17 is turned w'l abut the Webs 15 and prevent turning of the plunger. The screw 17 is rotated by means of a socketed key member 18 which passes through a cover plate 19 secured by screws to the outside of the strap plate 4 and being prevented from moving endwise by the end of the screw 17 bearing against the bottom side plate 4 .and by a collar 'on the key member 18 bearing against the inner side of the cover plate 19 when the screw 17 is turned to the right the plunger 16 is drawn up within thelcylinder 14 and greaser therein will' be forced out to the bearing through the oil hole 20, which is being toward the upper end of the bearing whence the lubricant will readily work down over the length of the bearing as these blocks are usually lying on their flat when in use.

The plate 19 may be removed to charge the cylinder 14 with grease and as the key mem- I ber 18 may be removed with the cover the filling aperture is not restricted as would be the case .if the key square and collar were integral with the screw 17 This isnotonly an efii'cient means for lubrication of the sheave bearing on the pin but is self-contained and is not exposed as a grease cup would be to the risk of injury.

The frame of the block being made of wrought metal is strong to resist the rough usage tol which such blocks are subjected and the manner in which the yoke is constructed renders it rigid under a heavy pull, while the block is both lighter andcheaper than if the parts `were constructed of cast steel which would otherwise be necessary.

Having now particularly described my invention and the manner of its operation, I

4hereby declare that what I claim as new and desire to be protectedinbyLetters Patent, is:

1. In a logging sheave block, the combination with a sheave rotatable on a pin secured in the side plates of the block and forming the distance-piecel between them, side plates having eyes secured to them for the reception of the yoke pins, and a yoke composed of a loo member and two compression links the atter extending directly i between the eyes on the side plates and yoke pins through the eyes of the side plates and the yoke. j

2. In a sheave block, the combination with a sheave rotatable on a hollow pin, side plates into apertures in which the hollow pin is fitted, strap plates secured to such side plates and having eyes for the reception of the yoke, bolts through the strap lates and hollow pin securing the sides together and to the pin, a yoke composed of a loop member and compression links each having eyes corresponding to those of the strap plates, and connecting pins through the strap plate eyes, loop member eyes and. compression links.

3. In a sheave block, a hollow pin on which the sheave rotates said pin having a plunger fitting within the hollow thereof and a screw tapped into the plunger and having a key projecting through the side plate, means for preventing rotation of the plunger, means for preventing end movement of the screw, and an oil hole delivering from thehollow of the pin to the external bearing surface thereof. v

4. -In a sheave block, the combination with a sheave, of .a hollow pin said pin having an internal grease chamber and a plunger endwise movable therein means external to the sheave block for drawing said plunger within said grease chamber on which the sheave ro- .name to this specification in the presence of two subscribing witnesses.

HENRY JAMES LITTLER.

Witnesses:

RowLAND BRrrTAIN, OLIVE S. CARMAN.

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