US1641957A - Safety means for hoists and the like - Google Patents

Description

V 1,641,957 Sept. 13, c, F. BLEDSOE SAFETY MEANS FOR HoIsTs AND THE LIKE Filed June 19, 1926 2 Sheets-Shed L p 927 c. F. BLEDSQE SAFETY MEANS FOR HOISTS AND THE LIKE Filed June 19, 1926 2 She ets-Sheet 2 Patented Sept. 13, 1927.

- g sm res" CARL rnnnnniv BLn H V v 1,641,957 PATENT OFFICE.

Dson, or CHICAGO, ILLINOIS, .assmlvoaro OGLE CONSTRUCTION COMPANY, 15. 003203111 1011; orrmmors. 1

' autu n nonnoistrs 1min m me.

npplicatio nnled June 19, 1mffse a 'n 117,024.

hoisting apparatus embodying oppositely moving buckets involving thls nvention.

Figure-Qisa diagrammatic View of parts.

of av hoisting apparatus. in'which a single bucket is, used, involvingthisinvention,

Figure 3 is a fragmentary elevational view of the safety means involving th1s.1nen on.

Figure 4 is a top plan view of the structureshowninFigureB. k I

Figure 5 is a sectiinalviewupon thellne V -,-V 0 F gu I This invention its jibroadest aspects comprises a plurality. of movable members which'may' bein the form of a pair of buckets, receptacles, cars OI'itllQllkG, or one of 1 which nlay constitutea counterweight; and

- means including cables for moving the same in combination with means independent 9 said cablesfor" sustaining/said members in casea cable fails by breaking or tearing -aapart or' the like. As the invention is: very usefnl in'c'onnection with hoisting appara-- tus, I have illustrated the application there,-

of in connection with ahoisting apparatus. Referring to Figure l, there is shown a hoisting machine 1 which may be of the type disclosed in myacopending application, Serial No. 46,621, filed July 28, 1925, and

which embodies a drum 2 and slack arms 3. Cables 4, which are attached to the drum, extend over a guide drum or pulley 5. From the pulley 5, one cable extends over the load supporting pulleys 6 and 7 and is attachedto a coal or ash hoisting bucket 8 by a suitable bail 9; the other cable is trained over a pulley 10 and is attached in a similar way to a similar bucket 8. The

i cables 4 are attached to the drum 2 in such a manner that one will wind up and elevate one bucket and the other will unwind and' lower the other bucket as the drum. is rot'atedi The mechanism so far described is old a and well-known and for thisf'reasonit has been only diagrammatically illustrated. f

. In the "operation of such a hoisting'appa-i ratus, the cable' '4 that sustains the loaded bucket sometimes fails, that is, it breaks,

whereby the loaded bucketdrops. This has proven objectionable. This invention while designed to remedy such a defect. I

In the embodiment that is chosen to il: lustrate this invention, a flexible connection or cable 11, which has its ends attached to,

'65 v not restricted to hoisting apparatushas been I the buckets 8, is'trained over a pair of pul leys12 mounted upon a stationarysupport '13 above the buckets. An intermediate portion of this cable extendsbetween thepulleys 12 in the form of a loop 14. A pulley 15. is supported in this loop and is freely movable in a vertical direction. Guides 16 A are preferably provided for guiding the pulley 15 and confining its movements in a vertical direction. The guides 16, which are preferably of channel shape in cross SQCtlOIl, engage the side strips 17 of a rectangular frame or block 17 a in which the pulley is journalled. A counterweight 118?.

is suspended from the pulley block tomain tain'the' same in vertical position.

The aforementioned support 13 consists of a pair ofparallel members 18 as shown in Figure 4. A brake shoe 18 is pivotedto the inner side of each member 13" adjacent each pulley 12 for engagement therewith," A link 19 is pivoted to each brake shoe. The lower ends of the links are pivoted upon :a common pivot pin 20 in an abutment block 21 adapted to be engaged by the pulley block 17 when thepulley 15 is elevated as will hereinafter be more fully explained. InFigure 2, there is illustrated an appa other cable 4 is attached to the stud 24 and 4 trained under the pulley 23 and over the pulley 6. The other ends of these cables 4-. are adapted to be attached to the drum of the hoisting machine.

In operating the appa "atus herein explained, the hoisting machine, which automatically reverses itsell, will alternately raise and lower a bucket, the other bucket or counter weight will of course move in the opposite direction. Now assume that one 01' the cables l, especially the one that sustains the load, should lail whereby the loaded bucket is released. The weight of such bucket will be immediately sustained by the safety cable 11. This weight on the safety cable will elevate the pulley 15 for applying the brakes 18 and stopping rotation of the pulleys 12. The t'riction between the cable and pulleys will prevent the cable from sliding, so that the load will be held suspended from the safety cable. This will prevent injury arising through a talling load to either the bucket or a workman.

I am aware that many changes may be made, and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and l therelore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

1. In an apparatus of the class described, a pair of oppositely movable members, a hoisting machine comprising a drum, cables connecting said members and drum, sheaves for supporting said cables, a pair of pulleys supported above said members, a cable trained over said pulleys and attached to said members and means for braking said pulleys when either of said lirst mentioned cables tail.

2. The combination with a hoisting machine including a drum, a pair of receptacles having cable connections with said drum, and means for sustaining said re ceptacles it a cable connection l'ails, comprising a cable attached to said receptacles, pulleys for supporting said cable, and means set in motion by said cable for b 'aking said pulleys when a cable connection tails.

3.111 an apparatus ol the class described, a support, a pair of pulleys mounted upon said support, a cable trained over said pulleys, receptacles attached to the ends of said cable, an intermediate portion of said cable extending betwen said pulleys in the form of a loop, a movable pulley supported in said loop, brakes for said first mentioned o. In an apparatus of the class described,

a pair of receptacles, means including cables for moving said receptacles, a stationary support including a pair of pulleys, a flexible connection surrounding said pulleys and attached to said receptacles, a pair of brakes for said pulleys, and means actuated b said flexible connection for simultaneously applying said brakes when a cable lails.

6. In an apparatus of the class described, a stationary support, a pair of pulleys on said support, a cable trained over said pulleys and extending in the form of a loop between said pulleys, receptacles attached to the ends of said cable, brakes for said pulleys, a rotary device mounted in said loop and having means for actuating said brakes, and operating means for said reccptacles.

T. In an apparatus of the class described, oppositely movable members, power means, connections between said power means and members for moving the latter in opposite directions, independent sustaining means for said members comprising stationary rotary devices, brakes for said rotary devices, and means for applying said brakes when one of said connections tail.

8. In an apparatus of the class descrflaed, oppositely movable members, a safety cable attached to said members, supporting means for said cable, movable braking means for said supporting means and means operated by said cable for actuating -said braking means when said cable sustains said members.

In testimony whereof I have hereunto subscribed my name.

CARL FREEMAN BLEDSOE.

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