US1599456A

US1599456A - Traversing hoist

Info

Publication number: US1599456A
Application number: US657921A
Authority: US
Inventors: William L Burks
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-08-17
Filing date: 1923-08-17
Publication date: 1926-09-14
Anticipated expiration: 1943-09-14

Description

Sept. 14, 1926.

w. I... BURKS TRAVERSING HOIST Filed August 17 1923 2 Sheet s-Sheet 1 Sept. 14 1926. 1,599,456 4 w. L. BURKS.

TRAVERSING H01 ST Filed-August 1'7, 1923 2 Sheets-Sheet 2 Patented Sept. 14, 1926.

wmm e BURKS;-

RELLEIOINT, ween: v emm;

" leeeesei 'JIRAVERSINQ ome This inv e'jritibn ielams meme-sing testes, arid more articularly to sueha, hoist ,lIi

chine'fyetoneenclthefeofl .7

The invem' eehe i for, its qb eemee pir'oe diiction oi 2-. n vel system of ee'ble' comeel for meperriage pi a1 t-mverein hoist. An-e othel'" b'je'ct is the pro'vifsiefi Qf' I'iie'ans feet automa' tieztlly c'ontroll-iiigtfie mdvlhet'its qf the carriage So that the dtfiger' of .ELCCILCIQI'I'ES due toflthe breaki'iig' Of c'abIe'sf 61 liiie's 1S duced to a Another object. is therfovision of a.'.s1ac] line iii 'a1 ,firevei1siingi heist ,sy'stemhwhich is emplo ed to fl f the load hel'difig mechz'ifii s ffi, and at fli same time take up sleek the ekidding 1ine, so that a, drblpifig' off the lfqljdt is eesufed.

In traversing hoists in, general use, the

lead is; held suspended; by at pulling: back; of

the outhaul line. one. of the objected-t inventiofi is, t0 v rcome thi' necese ty fqr" holding beck u oe the ot theiil Hne; Th fsj F result's reductibh of power e'xpfidedl and e substantial sawing iii opeeatihg C'Qtsl of the heist. v

Other objects and advantages of the.

ventin will hereinafter a pear. in the fol e lowing fies'efiptiofiend the nogvel teeter-es;

thereof will be perti'c l'afly pointect out the eppendedeleims; Like 7 reference cherecte 'zs ififliee-te}. I'Lke arts through the several figures ef the.

drawings, iii Whieh v V Figilre 1- is an} elevation (if a heistmg; tefni employing the fejzihire's ofmy invenuen;

Figure 2 is an elevation. of the carrier'- spirit thereoffi The f rm illustrated and de-- scribed te bej as indicet'ive dilly.-

a erb's s'ee'tiefiel View thrdugli inventien mprises e we-e; (If

. BATENT Gems;

carriage upon its @36 5 :01? fcableweyfl their corijointuse; W ll be given.

.Refefring to Figure, 1 me liumerar 1e 'foi" hoisting apparatus of this type and it comp'tiees an engi'xiel em three' drums de signed for ontrol jfthe myememsi ef the caflia e 11. The d'ium I2" c'ontr-bls the sklclding cable 13, the drum 1:; contnqls rig at the skidding end t the system While 19 represents the outhaul; rig. Bet -eehthe' rigs 18 3 nd 19, there is suspended a trac 01 ceblewaly- 20. At the point 21 the skidding and sleek; cables are joined t'egethei These Cebes mov together, alt'hdugh, ire-herein:

m et we 11 fie-spam m eeeh; other: e The geye'relcon olcable pass ove suit-- ciated that wheii the skidding and sleek. cables are ivvpund upon. their dun-es endt the ofithaul ee-ble allowed 1:0 play Ofi' its drum, the"v carriagejwill be; moved toward; the skidding ig'. This; is usu'al'ly Wh-eii it "is lo'eded.

1 It will; else be a preciated that when" the out'hagul eebljeis wound epon its drum and Elie-skidding and slack cables permitteclt6" advii eed toward the rig 1:9;

The carriage 11 comprises a hotising ofe twp side plates 2'2, eefljgoi ecl to ether" by bolts, Thesebelts (ferryspeeingjsleeves, 0'11? bearing memb rs, u onw ieh the sheevesiljrielq'secl n thG H O'U SIIIg revolve. The

nu'inei als 23," 28 indi'eatej the supperting heel? f0? the, ililffiag'e; these travel ttpoii' the c'scble 20..v ,Thepshe vgze istdesignedfto' upportithe skiedingceble While me W j pairs of

sheaves

25, 25, 26, 26, constitute guides for the loaded end of the skidding cable, which is in the form of a chain 27' creasing radius so that upon a downward movement of the free end of the lever 34, this jaw will grip the cable 20 with an increasing pressure.

Upon each side of the lever 34 there is formed a bearing lug 36 through which the pin 35 is eccentrically passed. Upon these bearing lugs 36 are mounted connectors 37 extending'to the smaller jaw 32 and connected thereto by means of the pin 38. This small jaw is pivoted upon the bolt 39, and its gripping face is upon .an increasing radius from the pin 39 rearwardly, so that upon a downward movement of the connectors 37 this jaw will be brought into increased gripping friction with the cable 20. a

In order to normally exert a braking effect upon the carriage, I have provided an elastic tension device connected to the brake lever 31 at 40. Thiselastic tension cevice comprises a rod 41 extending through

plates

42 and 43 and having the nut 44. On a pin 45 there is mounted a yoke 46, to which are pivoted the rods 47,. 47, which also pass through the

plates

42 and 43. A coil spring 48 lies between the

plates

42 and 43 and tends,

to spread the plates apart. This spring de-' vice exerts a continuous pull upon the lever 31 tending to apply the brake. I

It will be appreciated that the spring device just described will apply the brake to the cable20 by exerting a downward pull upon the free end of the leve'r34, which will bring the

jaws

32 and 33 in gripping relation with the cable. But I have provided means for overcoming the normal tendency to apply the brake by providing the lever 31 with the curved free end 34, to which I have attached the end of the outhaul line, as shown at 49. This outhaul line is used primarily to produce travel of the carriage from the skidding rig to the outhaul rig, and

the normal pull upon the outhaul line in per forming this function will be suficient to lift the free end of the lever 31 and place the spring device under tension. It will be appreciated too that when the carriage is travelling in the opposite direction, the placing of the outhaul line under a slight tension will be sufficient to counteract the tension of the spring device and relieve the.

brake. In fact the usual sag in the outhaul line is generally suflicient to overcome the spring action. If however for any reason the outhaul line should break, the brake will be automatically applied, and this will be true whether the outhaul rig is higher or lower than the skidding rig. If the carriage is travelling toward the outhaul rig there would be a tendency to release the brake by the traverse of the cable through it.. The tension of the spring device however is suflicient to exert a substantial braking efiect.

In order to provide a means for releasing the load under various conditions of use of the carriage, I have provided within the carriage housing a load holdirigdevice comprising a pair of gripping elements 50 and 51 pivoted upon the

bolts

52 and 53. Each gripping element is formed of two straps between the outer ends of which is mounted a roller, shown in dotted lines in Figure 2 at 54. These rollers engage the under face of a chainlink carried by the endof the Between the straps of the gripping ele ment 50 is pivoted the toggle link 55 connecting with the toggle lever 56 pivoted at 57 to the housing of the carriage. The opposite end of the toggle lever 56 is connected to the bolt 59 of the elastic tension device.

This elastic tension device is similar to the one described in connection with the brake and tends to keep the gripping elements in contact with the chain link. It comprises the central rod or bolt 59 screwed through cap 60 and movable through the plate 61. There 1s a coil spring between the cap and plate tending to separate them. The end of this elastic tension device is mounted upon an extension 62 of the carriage housing, which ex a pull upon the skidding line 13 will cause it to be brought up into the 'carriageuntil the block 28 rests between the faces of the

sheaves

26, 26, when the gripping elements 50, 51, will engage the sides of one chain link and the rollers 54, 54, the lower end of the link above. VVhile the tension device will tend to hold the parts inthis position, it is the angular position of the gripping elements and the weight of the load which accomplishes this result. Inforde'r to release he gripping elements, it is only necessary to exert a pull or jerk upon either end of the slack line while the other end is'being held. Such a pull or jerk will cause the sheave 30 to be lifted and with a the gn pin ueniena 50 and 51. The skidding line will then drop from the carriageunder the weight of'the load or of the chain 27, the slack thereofv being-taken up by theslack line.:

Itwill be appreciated that the slack line'is attached to the'skidding line at a point sufficiently distant from the carriage to permit the chain end of the skidding line to reach I the ground before the knot 21 reaches the carriage. Should it be desirable to release the load for any reason, a pull upon the slack line will notonly cause the gripping elements 50. and 51 to be lifted and the chain end released but will also take. the slack up in the skidding line, which is very desirable. Otherwise the weight of the slack in the skidding line might overloalance the weight of the chain end and prevent the successful operation of the hoist.

From the foregoing description, the construction and function of the individual parts of my invention will be clear. There remains to be set forth the action of these parts conjointly. t t a In Figure 1 I have shown the skidding machine lower than the outhaul rig. In this position of the parts the movement of the carriage toward the skidding machine is under the control of the outhaul line. If this line were to break and there was nothing to prevent it, the carriage would run down the supporting track'or cableway and wreck the skidding rig. lVith my invention, upon a breaking of the outhaul line the

brake elements

32 and 33 are applied and bring the carriage to a stop. This re the carriage from running into the outhaul rig. In this case there would be nodanger of the outhaul line breaking after the load is suspended, but the skidding line would have the heavy strain and might break, when the outhaul rig would be wrecked. However, ifit broke between the carriage and the joint 21, the weight would be immediately transferred to the slack line, when the gripping elements would be jerked open and the load allowed to drop. 7

If the skidding line should break at any other point, the carriage would move toward the outhaul rig until the joint 21 came into contact with the carriage, when again the slack. line would jerk the gripping elements apart, thereby; dropping the load and stop P g the carriage;

Having described my invention, what I claim as new and desire ters Patent 1s:

1. In a traversin hoist comprising a sus pended track or cableway and a travelling carriage having a load locking mechanism thereon, comprising a pair of interconnected gripping jaws, one of which carries a sheave, an outhaul line for securing movetosecure by Letr ment of the carriage in an outhaul direction, a

means carried by the carriage for locking the same to the cableway upon a breaking of the outhaul line, a load lifting and skidding line for moving the carriage in the inhaul direction, a second cable secured to the inhaul line and passing over the sheave on the locking jaw for normally releasing the locking mechanism andfor taking up slack in the'inhaul line, and for automatically releasing the load upon a breaking of the in-.

haul line. v

2. In a traversing holst comprising a suspended track or cableway and a travelling carriage embodying a load holding mechanism and an automatic brake, an outhaul line for securing movement of the carriage in an outhaul direction and for maintaining saidbrake inactive, and a cable control for' the movement of the carriage in the oppo-.

site direction comprising a combined load lifting andskidding line and a slackline associated therewith for releasing the load holding. mechanism and for taking up the sag in said lifting and skidding line."

3. In a traversing hoist comprising'a suspended track or cableway and a travelling carr1age,'a brake carried by SELld. ca rrlage and spring pressed toward braking position, an outhaul line for'imparting movement to the carriage in the outhaul direction and for normally maintaining said brake inactive, a load holding mechanism within said carriage comprising an inclined gripping element, a combined lifting andskidding cable,'the end of Which is adapted to be engaged by said gripping element, and a slack cable connected to said skidding cable and to said gripping element and operable to take up the slack in said skidding cable and.

to release said gripping element.

4- In a traversing hoist comprising a suspended track or cableway and a travelling carriage, a skidding cable movable through said carriage to lift the load, mechanism upon said carriage for locking said load in lifted position, and means for automatically releasing the load locking mechanism upon a breaking ofsaid skidding cablep 5. In a traversing hoist comprising a suspended track' or cableway and a travelling carriage, a skidding line for lifting aload to said carriage and for moving the car-