US1641298A - Cable-block system - Google Patents

Description

Se t. 6,1927. ,641, 98

I C. J. SIEFARTH CABLE BLOCK SYSTEM 1 Filed Aug. 10. 1925 Patented Sept. 6, 1927.

UNITED STATES PATENT OFFICE.

CHESTER J. SIEFARTH, OF PORTLAND, OREGON, ASSIGNOR TO WILLAMETTE IRON & STEEL WORKS, OF PORTLAND, OREGON, A CORPORATION OF OREGON.

CABLE-BLOCK SYSTEM.

Application filed August 10, 1925.

In many uses blocks have a tendency to twist, thus interfering with the free running of the ropes or cables through the blocks. This is particularly true where the blocks 5 are used for heavy cables, such as high leads, or sky line cables of logging systems. The present invention is designed to provide means on blocks preventing the twisting of the blocks in their use. Features and details of the invention will appear from the specification and claims.

The invention is illustrated in the accompanying drawings as follows Fig. 1 shows a side elevation of a top of 15 the mast showing a block, as a heel block, for

a standing line.

Fig. 2 a plan View of the block.

Fig. 3 a section on the line 33 in Fig. 1.

Fig. 4 a section on the line 4-4 in Fig. 1.

1 marks a mast such as is used in logging operations for carrying the sky line, 2 the guy lines for the mast, and 3 a standing line running over sheaves 4 in a mast head 5. A

floating block 6 of the heel block system is secured to the standing line 3 and the an chored block 7 is provided with a shackle 8 which is secured by anchor cables 9 with anchor posts 10. The floating block has sheaves 11 and the anchor block 7 the sheaves 12 and the rope 13 is run through these sheaves in the usual manner. The free end of the rope is carried around a sheave 14 carried in an extension 15 of the frame of the anchor block 7 and is carried through guide sheaves 16 in an extension frame 16 on the floating block 6. The heel block line is then carried over a sheave 17 of the block 18 and to the heel block drum (not shown).

The sheave 17 is secured to the mast head by shackles 18. A heel block slack line 19 extends from the floating block over a'sheave in the same frame with the sheave 17.

tending from the sheave 14 through the Serial No. 49,325.

It will be noted that the anchor block is locked against turning and the line 13 ex guide sheave 16 when taut is sufiiciently below the main line connectlon to prevent any turning of the blocks 6 and 7 under strain or in use. Thus the blocks are maintained in an upright and free running position through all conditions of use.

While I have shown the heel block line merely passing through the extension 16 it will be understood that the guide sheaves 16 may be actually put under strain by a deflection of the cable and that they may serve not only as a guiding extension but as a sheave maintaining the stress of such deflection.

What I claim as new is 1. In a cable block system,the combination of an anchor block; a floating block; sheaves in said blocks; off-set frames on said blocks; and a cable operating in said sheaves and through said off-set frames. H5

2. In a cableblock system, the combination of a block frame having a block sheave therein; an off-set downwardly extending frame having a cable guide therein; and a cable extending in an out of vertical direc tion around said sheave and through said guide and in a return direction.

3. In a cable block system, the combination of a block frame having a block sheave therein; an off-set downwardly extending 75 frame having a cable guide therein; and a cable extending in an out of vertical direction and operating on said sheave and returning through said guide.

In testimony whereof I have hereunto set my hand.

CHESTER J. SIEFARTH.

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