US1625910A - Cable block - Google Patents

Description

April 26! R. P. SEY

CABLE BLOCK Filed Au 2 1924 0, A v r 1,111)

INVENTOR. Wait? d/wvfliuj BY ATTORNEYS Patented Apr. 26, 19274 UNITED STATES ROBERT I. RAMSEY, OF DULUTH, MINNESOTAQASSIGNOB TO CLYDE IRON WORKS, OF

PATENT OFFICE.

' DULUTH, MINNESOTA, A. CORPORATION OF MAINE.

CABLE nLoox.

The present im rovements, relating, as indicated, to cable b ocks, have more particular regard to cable blocks of the type that forms the subject-matter of U. S. Patent No.

1,243,847 to J. R. McGiffert, dated October 23, 1917. As in the case of such patented block, the object of the present invention is to provide means for enclosing the arms of the frame or housing in which the pulley 1s mounted in order to effectively brace the same and prevent accidental dislodgement of a cable passing over such pulley. A further object is to provide in such block a thrust or wearing washer, one on each side of the pul- 1 5 ley, which ma be readily removed for the purpose of rep acement when worn and thus avoid the necessity of discarding the entire block. v To the accomplishment of the foregoing and related ends, the invention, then, consists of the means hereinafter fully described and particularly pointed out in the claim, the annexed drawing and the following description settin forth in detail certain mecha- 2 nism embo ying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing Fig. 1 is a. side elevation of my improved ,cable block; Fig. 2 is an end elevation with .one side shown in vertical central section, as indicated by the line 2-2, Fi 1; and Fig. 3 is a perspective view of the a oresaid thrust or wearing washer that forms one of the features of improvement.

The frame of the block is in general of familiar design, comprising two side memhers I and 2, in the respective lower ends g8 of which is fixedly secured the transverse spindle 3 upon which the pulley or sheave 4 is rotatably mounted.

Pivotally secured-to the upper end of the arm 1 of said frame is a clevis 5 that constitutes one of tli features of improvement herein. This clevis -i s of the usual semi-circular or U shape andwhen closed is secured in place by means of a" removable pin 6 that passes through its pther end and the upper end of frame memher 2. The latter, it will be noted, is formed on its inner face with an outwardly inclining or beveled surface 7 The end of the clevis that is pivotally attached to fiam'gnember 1 has formed integrally therewith an angularly related extension or arm 8 which is adapted to project across the space between the two side members of the frame and has its extremity 9 of complementary form to the surface 7 on said side frame member 2. The rear face 10 of extension 8 is inclined in the opposite direction to its extremity 9, the two inclined surfaces being symmetrical with the center line of the block, and side frame member 1 is provided with a bearing face 11 identical with face 7 on member 2. In fact, the two side frame members are identical throughout, being made from the same pattern or die so as to constitute interchangeable parts 111 the assembly of the block.

As shown in dotted outline in Fig. 2, when in 6 is withdrawn, the clevis may be turned ack on its pivotal bearing in side frame member 1 so as to leave the throat of the block entirel clear of any projecting part when it is block or remove such cable therefrom. In

esired to place a cable inthe other words, it is unnecessary to thread such cable or line through the throat of the block. However, when the clevis is secured in its closed position, the arm 8 constitutes an effective line guard and prevents such cable from running up into the curved part of the clevis. The arm furthermore bears against both sides of the block, the bearing faces 7 and 11 of the two side frame members being identical and the contactingportions of fore explained. The semi-circularclevis is load and at the same time the tops of the the arm being complementary, as hereinbeblock-sides are prevented from bending tother.

Ordinarily in blocks of the kind in hand, the frame parts are made of open hearth steel, while the pulley or sheave is made of manganese steel because of its longer wearing quality. The result, however, is that the inner faces of the side frame members 1 and 2.that contact with the ends ofthe hub of'the pulley wear away more rapidly than such hub ends. of the block, I accordingly insertin eachside member a thrust or wearing washer 12 of manganese steel just like the sheave, such washer bearing against the opposed hub end 13 of the sheave. Such washer is formed with two oppositely located pins or dowels To increase the life.

each side frame member.

-washer is somewhat wider than the opposed .hub face so that all the wear is sustained by the latter and such washer.

Other modes of applying the principle of my invention'may be employed instead of 'the one explained, change eing made as regards the mechanism herein disclosed, provided the means stated by the following claim or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention 2-- In a cable block, the combination of a frame comprising two side members, the latter being duplicates, a pulley mounted be tween said side members, a clevis pivotally attached at one end to one of said side members, and an angularly related arm on said clevis adjacent such pivotally attached end adapted to extend entirely across the space between said side members, such space being left clear when said clevis is swung upwardly about its axis, said side members having upwardly and outwardly inclining faces symmetrically disposed with the center line of the block and said arm being formed with faces complementary to those on said side members and adapted to contact tllierewith in the closed position of said c evis.

9Signed by me this 23rd day of August, 1 24.

ROBERT P. RAMSEY.

Images