US1379868A

US1379868A - Cable-guard for tackle-blocks

Info

Publication number: US1379868A
Application number: US383703A
Authority: US
Inventors: Jack M Kelsey
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-05-24
Filing date: 1920-05-24
Publication date: 1921-05-31
Anticipated expiration: 1938-05-31

Description

J. M KELSEY. CABLE GUA BD'FOR TACKLE BLOCKS.

I APPLICATION FILED MAY 24. L920.

Patented May 31,1921.

IVTOR. v

A TTORN Y BY/n 1; i eat :uic M. KELSEY, or BBEA, CALIFORNIA.

' CABLE-GUARD FOR TACKLE-BLOCKS.

. Application filed May 24,

To all whom it may concern:

Be it known that I, JACK M. -Knnsiav, a citizen of the United States, residing at Brea, in the county of Orange and State of a cable guard for tackle-blocks, as a safety device designed to prevent accident to an operator by having his hands cr -clothing become caught between the block and cable runs or otherwise. v r j Another object is to provide a cable guard which automatically adjusts itself to varying angular and spreading movements of the cable runs and prevents the cables running off their respective cable sheaves, and which also prevents an upsetting of the block.

Another object is to provide a cable guard having a series ofremovablje cable engaging elements capable of being assembled in varying numbersto cooperate with blo'ckshaving difi'erent numbersof cablesheaves and adapted for attachment to blocks of various sizes.

Various other objects and advantages will be more fully apparent from the following description of the accompanying drawings, which formea part'of this disclosure, and which illustrate a preferred form of embodiment of the invention. I I

Of the drawings: F'gure 1 is a side elevation,-partlyin section, of-atackle-blockembodying the features of my invention;

Fig. 2 is a partial end elevation.

I Fig. '3 is a detail section on linev w ''w of Fig. 1, and

Fig. 4 is an end elevation showing the device as shifted by a spreading of the cable runs.

In the drawings, the cable guard of the present invention is illustrated as applied to a snatch block as generally used as part of well drilling and operating equipment, and in such use the cable is rove around relatively separated crown pulleys at the top of the well derrick so that as the block is elevated toward the top of the derrick the runsof thecable adjacent the block 1920. 8' SeriaI -No. 383,703.

become more widely separated transversely and laterally. The present structure automati-cally adjusts itself to this separation of the runs of the cable and by engaging the cable runs above the pivoted center of the sheaves of the block prevents the block from upsett ng in either direction.

While I have illustrated a three sheave I block 111 the drawings, itwill be understood that the cable guard herein disclosed may be applied to blocks having any number of Specification of Letters Patent. Patented 31, 19 21 i sheaves and that any desired number of the cable housings or shoes as independent removable units may be assembled together for use on blocks. of varlous sizes.

Q In the drawings, the frame of the block I comprises two side plates 1,2 and two. in-

termediate spacing plates

8, 4, secured together at their opposite ends by

transversebolts

5, 6, the plates being maintained in spaced relation at each-end by the hub p0r-. I

tions 7, 8 oftheupper and lower bails 9, 10, and bya spac ng sleeve 11 as shown in Fig. i

2, this being the general frame 'structureof standard tackleeblocks. The cable sheaves- 12, 13, 14: are positioned between the plates and are journaled on a transverse rod 15 extending through'allned apertures therein.

Attached to the upper portionsof each side plate 1,, 2 Iprovide' laterally extended

bracket arms

16,16 and 17,17 eachpair being relatively transversely alined and extending outwardly; Carried by these bracket' arms are

transverse pivot rods

18,18 each extended across'andadj acent the faces of the cable sheaves and maintained against displacement by a head 20 and lock-nuts 21,

22. Each pivot-rodispositioned between the faces of the cable sheaves and-the adjacent runs 23 of the cable andform meansfor pivotally supporting'the respective cable; I I

guards.

The guard elements for the cable runs are all of duplicate -construction, each comprising a housing 24L of the U-shaped cross sec tional contour, loosely pivoted on the respective pivot rod 18, the rod extending through transversely alined pivot apertures 19 in-the opposed limbs of the-housing said apertures being enlarged; to permit". the

housing. to tilt transversely on the rod. Each housing 1s positioned on its pivot rod with its open side facing inwardly and they respective cable .run passes upwardly in the cable-way between the rod and the back wall of the'housing A transverse retaining rod 25 extends through alined apertures 26 in the opposed limbs of the several housings 24: and is positioned on the inside of the several cable runs 23 closing the upper portions of the open sides of the housings and engaging the inner surface of the cable runs to maintain the housings in position. The apertures 26 are enlarged so that each housing or shoe 24L may tilt transversely Without binding on the rod 25 and the rod has a head 28 at one end and

suitable locknuts

29, 30 on the opposite end, maintaining it against displacement. The lower edges of the cable housings 24 are flared outwardly so as not to foul the cable during the various tilting and rocking movements of the housings.

In assembling the guard elements or housings on the block after the cable has been properly applied and with the block suspended as shown in Fig. 1, a proper number of said housings, depending upon the number of cable sheaves in the block, are placed over the cable runs and the pivot rod 18 is threaded through the apertures in the bracket arms and through the pivot apertures 19 of the several housings and the lock-

nuts

21, 22 screwed on the rod to secure it against displacement. The retaining rod 25 is then threaded through the apertures 26 in said housings and the lock-

nuts

29, 30 screwed thereon.

In use, the guard elements or cable housings will effectively prevent an operator from inserting his hand between the moving cables and the cable sheaves and as the cable runs 23 spread apart to a greater tangential angle the housings will rock on their pivot rods, as indicated in dotted lines in Fig. 1. And when the cable runs 23 spread apart transversely the housings will slide on the pivot rods and Will tilt transversely to automatically accommodate themselves to the changing angular positions of the cable runs, as shown in Fig. 4, this tilting being permitted by the enlargement of the apertures in the housings. The engagement of the cable housings or shoes with the cable above the center of the cable sheaves also prevents the block from upsetting and maintains the block in an approximate vertical plane when not in use.

I claim: r

1. Ar cable guard combining a tackleblock having a frame and a cable sheave, a pivot rod carried by the frame and extended across the face of the sheave, a cable shoe loosely pivoted on said rod and adapted to embrace the sides and the outer surface of a cable rove around the sheave, and means carried by the shoe adapted to engage the inner surface of the cable to maintain the shoe in position.

2. Acable guard combining a tackle-block having a frame and a cable sheave, a pivot rod car-ried by the frame and extended across the face of the sheave, and a cable shoe providing a U-shaped cable-way engaging the sides and the outer surface of a cable rove around the sheave and loosely pivoted on said rod, the shoe having means adapted to engage the inner surface of the cable in said cable-way above the pivot rod.

3. A cable guard combining a tackle-block having a frame and a cable sheave, a pivot rod carried by said frame and extended across the face of the sheave, a cable shoe providing a U-shaped cable-way engaging the sides and the outer surface of a cable rove around the sheave and loosely pivoted on the rod, and means engaging the opposed limbs of the shoe and extending across the cable-way to engage the inner surface of the cable above the pivot rod.

4;. A cable guard combining a tackleblock having a frame and a cable sheave, a cable shoe U-shaped in cross section and positioned with its open side facing the sheave, said shoe having transversely alined apertures in its opposed limbs, a pivot rod carried by the frame and extending across the face of the sheave and through said apertures and providing a cable-way between the rod and the back of the shoe, and means carried by the shoe, spaced from the pivot rod and adapted to engage a cable in the cable-way to maintain the shoe in position.

5. A cable guard combining a tackle-block having a frame and a cable sheave, a pivot rod carried by the frame and extending across and positioned closely adjacent the face of the cable sheave, a U-shaped cable housing loosely journaled on said rod and providing a cable-way between the rod and the back of the shoe, and means'carried by the shoe and extended across the upper end of the cable-way.

' 6. A cable guard combining a tackle-block having a frame and a plurality of cable sheaves, a pivot rod carried by the frame and extended across the faces of the sheaves, a plurality of cable housings of U-shaped cross sectional contour pivoted on the rod and providing independent cable-ways, the pivot apertures being formed in the opposed limbs of each housing and enlarged to permit an independent transverse tilting thereof, and a retaining rod extending through alined enlarged apertures in the opposed limbs of each housing and closing the upper ends of the cable-ways.

7. A cable guard combining a plurality of cable housings of U-shaped cross sectional contour providing independent cable-ways and having transversely alined pivot apertures in their opposed limbs, and other transversely alined apertures in their opposed limbs spaced from the pivot apertures, a tackle-block having a frame and a plurality of cable sheaves, a pivot rod carried by the frame and extending across the faces of the sheaves and through the pivot apertures of the cable housings, and a retaining rod extended through the other alined apertures of the cable housings, both rods being spaced from the back Walls of the housings to form intermediate cableways, all the apertures being enlarged to permit an independent free transverse tilting of each cable housing.

8. .A cable guard combining a tackle-block having a frame and a cable sheave, a cable rove around the sheave and having a tangentially extending run, a transverse pivot rod carried by the frame and positioned between said cable run and the face of the sheave, a cable housing loosely pivoted on said rod and providing a U-shaped cable- Way, the cable run passing between the pivot rod and the back Wall of the housing, and means closing the upper portion of the cable-Way and engaging the cable run. to maintain the housing in position.

9. A cable guard combining a tackle-block having a frame and a plurality of cable sheaves, a transverse pivot rod carried by the frame and extending across and adjacent the faces of the sheaves, a plurality of cable housings loosely pivoted on the rod, each housing being of U-shaped cross v sectional contour and forming a cable-Way between the pivot rod and the back wall of the housing, and a retaining rod extending through the opposed limbs of each housing and closing the upper portions of the open sides of the housings. g

10. A cable guard combining a tackleblock having a frame and a cable sheave, a pivot rod carried by the frame and extended across the face of the sheave, and a cable