US1252122A - Safety cross-head for mine-hoists. - Google Patents

Description

. S. JEWELL. SAFETY CROSS HEAD FOR MI NE HOISTSL APPLICATION FILED JAN. 25.1915.

1,252,122, Patented Jan. 1,1918.

2 SHBETS-SHEET 1.

A WOBWEF S. JEWELL.

SAFETY CROSS HEAD FOR MINE HOISTS.

APPLICATION FILED JAN. 25. 1915.

' i --sAMUEL JnwnLL, F NEGAUNEE, ivrronrsa v.

v sArErY oRo'ss-nEAn Fort ivrrivn-nors'rs.

Safety Cross-Heads for Mine-Hoists, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof. p

' My invention relates to cross-heads for mine hoists and has for one of its objects to provide a safety cross-head'that shall be simple and durable in construction, positive and reliable in operation, and adapted to not only prevent the cross-head fromdropping in case the rope or cable breaks,

but also to eliminate the possibility of'its becoming accidentally stuck or hung up in the shaft.

Other objects and advantages of my 'invention will be setforth hereinafter, and in order that my invention may 'be thoroughly understood, I will now "proceed to-describe the same in the following specification and then point out the novel features thereof in appended claim. Referr ng tothe drawings:

Figure l is a front elevation of. acrosshead arranged and constructed in, accord herelna'fter explalned.

ance with my invention.

An end elevation of the same is shown in Fig. 2 p p Fig. 3 is a sectional elevation showing the cross-head in its set position and Fig. 4: is a sectional plan view, taken on the line 4-4 of Fig. 3.

The cross-head illustrated is of the typeused in the mine hoists-and is adapted to be raised out of or lowered into a shaft with a; rope or cable,the load being supported by a bucket or other suitable carrier which is connected to the rope or cable, after it extends through a guide in the cross-head. Cross-heads of this type are very heavy and may do considerable damage if one 1s accidentally hung up in the shaft for any cause and then drops onto the bucket after the latter has been lowered away from it. It has been my aim to provide a safety device for preventing accidents ofthis character and also for preventing the dropping of the bucket in case the rope or cable should break above the cross-head.

As clearly shown in the drawings the cross-head comprises a trams built up of Specification of Letters Patent.

. Patented Jan. 1,1918.

7 Application filed January 25,1915. Serial No. 4,19e.

flanged side runners 10 and 11 which are Y adapted to cotiperatewith guideways 8 and 9,: and a-pair of transverse box beams 12 and 13. Securedto the box beam 12 and exwhich'the bucket cable or'rope 15 extends.

This sleeve-may be secured in any suitable manner, as for example by being screwed 1nto a block 16 as clearly shown 1n Fig. 3,

and it may be conveniently formed of a pipe section.

It has a slot 17 in one side through which a pawl 18 extendsas hereinafter explained.

A pair of yokes or clevises 19 and 20 are secured in an upright position between the sides of the box beam 13 and are located one on each side of the sleeve 14 which is in the center ofthe cross-head. A horizontal yoke 21 having a ring-shaped center 22 through which the cable 15 extends, is sus pended by'links 34- and 35 as explained be low and has connected to it spring guide rods 23 and 24 which extend through suitable holes in the" top of the clevises 19 Near the respective ends of the box beam 13 are a pairof cross pins 30 and 31 on 'which'are mounted cam jaws 3233. The

'oam jaws are actuated by theyoke-21 to which they are connected by links 34-36' and 35-37. The arrangement of parts is such that the links 36'and 37 are rigidly fixed relative to the cam jaws 32 and 33, either directly or through the pins 30 and 31," and consequently "when the yoke'21- is moved upwardly in opposition to the springs the cam jaws are rotated on their pivots and are released from the guideways 8 and '9 with which the flanged shoes 10 and 11 cooperate.

A collar 39 is clamped to the sleeve 14 near its lower end and supports the pawl 18 which is pivotally mounted upon it and extends upwardly through the slot 17 in the sleeve. Secured to a pin 40 on which the pawl 18 is pivoted is a lever 41 which extends through a guide strap 42 on the shoe 10 and is adapted to be actuated manually for the purpose of releasing the pawl.

The shoes 10 and 11 have slots 43 and 44 guide rods 23 and i through which the cam jaws 32 and33 extend and the outer surfaces of the cam aws are notched or toothed asshown attendee to enable them to morefirmlygrip the timbers of which the guideways '8 and'9 are usu-v ally comprised.

The eable"is-'formed into aloop 48below the cross-head and its/endjs. doub ed back on itself and extends upwardly into or beyond the sleeve 1124. :The. end is 58539121313 fastened to-,the body of the ropeby rings or clasps "50, atzleast one ofzthe clasps,:as clearly shown in Fig 18,:ibeihg located "above th pawl 18. 'L -The .pawl is Ethusable to tengage 15-.

itheeringand :PIGVGIHD the ropezfrom being pulled out of:the cross-head incaseithekrope should bebroken abovesthe'head. ,A ring'or 1 collar .51 is, tmounted {on :the rope under. :the

ringshaped tcenterQQ of, the yoke :21 an d above;one ;of the :rings ,-50. Thisicollar preyents tthe [crossT-head from falling and, ,since it engages :the yoke 21, :the entire weight; of the cross-head tends to compress thesprings itheabox'tbeam 13,-and swing the aws32 ands33 :into their released position shown .in :Eig. ;1. The yoke 211 :eonstitute a n e .conneeting and actuating bar @5601 the links land y normall'nanner the shoes 10 and "11 willslide v .on-ztherguidew eye e d .9 and thecam jaws .will be released and will not engage the guideways.

If, however, the rope should break the load will immediately-tendto pull ;the rope-outmf theerosshead and-this will sbepreven ed hyh eng g men f the pa l ,91-8 withthe rung- 50, which .is above it, as

ishowniin Fig, 3, "Elle loadonthe'eableiends .to :tI'ZLYQl faster than ;the cross-head on account of the :irietion b twe n th h e en the "guideways, a ons quen y th I ee la -51 wi11 cease to support the weight ,ofthe cross-head with the result that the springs will push down the yoke 21 and set the cam aws against the-guideways. The cross-head andjthe load will thus be brought to rest.

Should the cross-head stick, it will be forced downwardly by the engagement of oneofthe rings with the pawl 18 for a short vdistanee suflicient for the safety cam jaws, which are at once released, to be set into the guideways, v I v t he'bueke .er c rier istheing ra s @thesepnng wil ale ieemp esed an th j w held :in thei rel as v p si ions unde ne Anal condit ons. th S II :iLS.- Q W "i1lg- 11:1 is. d i e to pay outthe o pe ab1e-threughth er shee 'ee for xamp eform-anew 2190p, ,the pawhmaytbe released by rth lle ero- 4:1

The details ofithestructureillustratedn ay th varie with n he spir and scop re y in en ion an intend t tonly such li itt itiens the-impo ed r ind ated ie th Nihatjleelaim-is s I safety .c e sz d comp i ng o a f am iharingssheesa eptedto eeoperate withstaeien ny lguidew re, 1 re sui l eete h ;ing; asl a eh rivetelly mounted en th sleeve and extending through the ot, a

h nd; e e r.-te -lre ee ng 1 elate e t wors yok h ing ePeeme-" e h i p and -.yie1dine ysusp d di ml h hem fsprin-gs tending 'to force the .Y ie downwa u a p air 9 eluteh ja s ePPe i ely-e ni etedz e th yok at s-respective endee adapted to be forced outwardly ,into eng'agement with the guideways ,hy thB prings,

.-.t.he we gh e heeoi ehee e esenpli to th .-y ke t relea e th eteh'j w und r a normal operating eonditions. V

;In, testimony whereof I have hereunto set my hand this 13th day'of Jan." 1915 in the -.-p e ne l e two su scribing. tne

V SAMUEL EWEL Witnesses: v w

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