US968811A - Tackle-block. - Google Patents

Description

W. H STAM.

TACKLE BLOCK.

APPLIOATION Plum MAY 14, 1909.

Paten ted Aug.30,1910.

THE NORRIS PETERS co" WASHINGTON, n. c

WILLIAM H. STAM, or VERDI, NEVADA.

TACKLE-BLOCK.

Specification of Letters Patent.

Patented-Aug. 30, 1910.

Application filed May 14, 1909. Serial No. 496,025.

To all whom it may concern:

Be it known that I, lVILLIAM H. STAM, a citizen of the United States, residing at Verdi, in the county of Washoe and State of Nevada, have invented certain new and useful Improvements in Tackle-Blocks, of which the followin is a specification.

This invention reiates to tackle blocks and refers particularly to a specific construction of the same.

An object of the invention is to provide an improved tackle block which permits of an intermediate portion of the cable to be entirely disengaged from the same by slipping it laterally fromthe pulley or sheave which is mounted therein.

The invention further contemplates the provision of a block of this character by'the use of which a great saving of time may be effected as the intermediate portion of the cable may be removed without slackening the same and without releasing the tension of the shifting portions of the cables.

For a full understanding of the invention reference is to be had to the following description and accompanying drawings, in which Figure 1 is a side elevation of the improved block. Fig. 2 is a vertical longitudinal section through the same. Fig. 3 is an end View showing the block in an open position, and Fig. 4 is a top plan view.

Corresponding and like parts are referred to in the following description and indicated in all the views of the accompanying drawings by the same reference characters.

Referring to the drawings, in which is disclosed the preferred embodiment of the invention, the numeral 10 designates the sheave or pulley which is mounted within the improved shell or casing. The shell comprises two side plates 11 and 12, which are disposed in parallel and which are provided with tongues 13 and 14, the tongues being curved upon themselves to form bearings for a pintle 15. The side plate 12 is curved inwardly at its lower extremity and extended to the lower end of the side plate 11 where the tongues 13 and 14 are curved and engaged by the pintle 15. The side plate 12 is provided with a web 16 which is formed with a suitable tongue to engage about the pintle 15 in order to pivotally support the same, the web 16 being disposed in parallel with the side plate 11 and cooperating therewith to support a pin 17 which passes centrally through the sheave 10 to rotatably support the same. The pin 17 is provided upon one end with an annular shoulder 18 for engagement against the outer face of the web 16 to limit the longitudinal movement of the pin 17 therethrough, the pin 17 being threaded at its opposite extremity, upon which a suitable clamping nut 19 is positioned, which serves to draw the pin 17 through the web 16 and side plate 12 in order to clamp the same against the opposite sides of the sheave 10.

The side plate 11 is rectangularly looped .at its upper extremity to form a cross-arm 20 through which a swivelly mounted hook 21 is positioned, and to form a cross-brace 22 for the purpose of reinforcing the shell. The upper extremity of the side plate 11 is curved downwardly and positioned against the inner face of the side plate 11 where it is secured thereto by the employment of suitable rivets or the like. The abutment 23 which is formed upon the looped portion of the side plate 11 receives the upper extremity of the side plate 12 which is retained in such position thereagainst by means of a locking pawl 24. The locking pawl 24 is carried by the abutment 23 and extended downwardly therefrom to engage against the upper end of the plate 12. The pawl 24 is retained in position by means of a rod 25 which is disposed transversely through the looped portion and terminated at its opposite ends in the plate 11 and the pawl 24. A washer 26 isdisposed about the rod 25 to space the pawl 24 from the abutment 23 to thereby admit of the positioning of the upper end of the side plate 12 therebetween. The locking pawl 24 is so disposed that when the same is positioned longitudinally of the abutment 23 the extremity of the pawl 24 is engaged against the outer face of the plate 12 and retains the same against the abutment 23 tolock the block in a closed position. The pawl 24 is provided with an indentation 27 which is formed in its inner face adjacent its outer end to receive a projection 28 which is outwardly extended from the central portion of a leaf spring 29. The leaf spring 29 is secured across the upper end of the abutment 23 to frictionally retain the locking pawl 24 in a closed osition, the sprin 20 being bowed outwar ly at its intermediate portion and retained in such position by the riveting of the ends of the same to the abutment 23. To further the stability of the shell a stud 30 is disposed upon the lower end of the abutment 23 and extended outwardly therefrom for engagement in an aperture formed through the side plate 12 to prevent the sagging of the plate 12 upon the disposition of a tension upon the sheave it).

In operation. when it is desired to engage a portion of a cable over the sheave 10 the locking pawl 2% is partially rotated to disengage the inner end of the same from the upper extremity of the side plate 12 and to thereby permit the swinging downwardly of the same about the pintle 15. The web 16, by reason of its connection with the pin 17 is likewise drawn downwardly and retained in parallel relation to the plate 12, admitting of the reception of the cable within the curved periphery of the sheave 10, the cables being positioned over the upper end of the side plate 1.2 and the web 16. The locking pawl is then returned to its former position whereupon the outer extremity of the same is engaged over the stud or projection 28 carried upon the leaf spring 29.

The side plate 11 is apertured at a point which is opposite to the inner end of the pin 17 and in order to admit of the closing of the sides 11 and 12 and to further form a support for the pins upon which the sheaves or pulleys are mounted.

Having thus described the invention what is claimed as new is 1. A tackle block including a plate, a second plate hingedly connected to said first plate, a web concentrically pivoted between said plates and positioned against the inner side of said first plate, a pin carried by said web and said second plate, a sheave mounted on said pin and means for locking said plates together at their upper ends.

2. A tackle block including a pair of hinged plates, a web concentrically pivoted between said plates, a pin connected by said web and one of said plates, a shoulder on said pin for engagement against the outer face of said web, a threaded portion on the opposite end of said pin for engagement through one of said sides, a nut positioned upon said threaded portion against theouter face of the side, means for locking said plates in a closed position, and a sheave located about said pin.

3. A tackle block including a plate, an angular loop formed upon the upper end of said plate, a second plate hinged to said first plate at the lower end thereof, said second plate having an angled portion at the lower end thereof to dispose the same in parallel relation to said first plate when swung into an upward position, a web concentrically pivoted between said plate and engaged against said first plate, a sheave loosely disposed between said web and said second plate, and locking means carried by said leaf for engagement with said second plate.

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

WVILLIAM H. STAM.

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