US1661307A - Hoist - Google Patents

Description

March 6, 1928. 1,661,307 N. M. ROSENDAHL I HOIST Filed April 26, 1926 2"Sheets-S heet 1 March 6, 1928.

- N. M. ROSENDAHL HOIST Filed April 26. 1926 2 Sheets-Shea} Z nlj lm ml I 5 Patented Mar. 6,1928.

ninsiu BOSENDAHL, or WATEBLOO, 'IowA, As istants ooirsrabeaiioi imem I OM AN A'CQ Q QR T N F'I W i Application filed-April 2 s, 1926. astin -104 71 Thisinvention relates to hoists'an'd has The principal object ortheinvention is that of providing a dependable automatic clutch and brake mechan sm fOTSLiCllllOlStS.

Other objects and advantages o t the'invention will appear-in thefurther damp;

tion thereof. Y I, Referring now togthe accompanying drawingyforming' part or this"application, and wherein; like reference characters findlc'ate like-partsf," i Figure 1 is a side elev'at'ion of "aloadmg hopper andbucket as applied to a concrete mixer; j" c Figure 2 is an enlargedelevation, partly in sec'tiomof' the upper endlofthe inclined track in which the bucketoperates z 7 Figure'3 is a 'still further enlarged per spective View of the power the bucket; I

Figure dis a-pla'n viewin detail of the. trip for the power releasing mechanism;

Figure 5 is' a diagrammatic, view o f'the power transmission unit with power applied to thedr'umj v V 1 I V Figure 6 is a View" similar'to Figure}: showing the trip mechanism released g and Figure 7 is a View similar to Figure 5 showing the power transmissionanechani-sm in its opposite position.

l represents thesupporti'ng frame .01" a concrete mixer, 2 the drum, and 3 the inclined track or waysfor the loading hopper or skip 4:, all of which are common 1n the art. The extreme upper end of the runway terminates in a horizontally disposed pocketlike structure 5, sufficiently large for the re ception of the wheels 6 upon either side of the upper end of the skip 4t, and into which the wheels roll when the skip is raised to its uppermost position by draft upon the line 7 the axle of thewheels in such position acting as thepivotal point'of the skip so that as pull upon the line 7 is continued the skip will assume the position shown in dotted lines,- Figure 1, drum.

The hoisting line 7 is roven over any desired arrangement of sheave or sheaves, not shown, and leads to the hoisting dru1n8 carand empty into the releasing shoe of vided at one end with a brake lO' andat the opposite end with theclutchmechanism 11; these two' devices-being cooperatively controlled by the'han'd lever 12', pivoted as at 1 3 and having connected thereto" the rod 14 leading togthe lever- 1'5 niounted ivoe ally as at .16"substantially parallel with the lever 125 saidf rod 14; continuing on past the lever "15 asat 17 1'pivotallylconnected as ri ed upon the mixer andflloosely mounted I [upon the power. shaft 9; This drum' is pro- 3 at" 18t0 the bell crank'lQ whichjis pivoted at;

QQand its opposite ariii-a'ttachedaas at 21 to the brake band 10, so'tha t anextfreme pull to,

the left, as'viewedin; the, diagram", will "ap';

ply} the band and thus brake the drumfi.

. The upper end oftheflever laisconnect'ed in: the usual'manner a's at 22 to theclutch mechanism '11, and .is provided intermediate of 's'aid clutch mechanism and its connection; with-the rod '14 withla' contractile spring'23 fixed ar 24; this spring "being for the purpose of applying a constant backwarddraft to' the clutch" lever 'l5fthus biasing' same toward an inoperative position, 'How ever it'is'apparent that if the "sprin'g 'is al lowed to fully function in holding theclu'tch in "cooperative 5 position the jbrakefband 1O wouldbefullyapplied to thejdrum;.; c l v Now, 'for' the automaticcontrol of this mechanism, I providea catch and o trip (18:

vice comprising a horizontally reciprocab'le rod 245attached as at'1-25 tor thel upper end of the' hand levei" l2, the same beingmounteu inan y convenient manner in 'the Urshaped frame '26 fixed adjacent the'hand lever; On

this rod 24; is attached as by the'thumbscrew 27 the block. 28, it being so positioned that V when the lever is' thrown fullyto theright, as shown in Figure 5, with-the power ap.

will catch behindthe dog 29, pivotally mountedas at 30, said dog having jvertically disposed fingers 31 upon either side of the rod 24 for pushing engagement with the rear end of the block 28 when the dog 29 is firmly attached to one of the side members 95 plied to the drum and the brake released, it

I or angle irons '37 of theskipas at 38. As

the skip approaches its fully elevated position the fork will straddle the rod 32 and engage the button 35, the action of which is and simultaneously pushing said block, by contact of the fingers 31, to the end, thus forcing the lever 12 outwardly or towards its centerinost pos tlon, when, as 15 obv ous,

the spring 23 will be permitted to function and throw the lever 12 to its extreme outward or left position, w hich, as ,before stated,

will disengage the clutch 11 from the drum 8 and simultaneously apply the band 10 braking the drum and holding the skip its dumping position. H I c As suitable mean's for holding the dog 29 in operable position in respect to the block 28 I have provided an expansive helical spring 39 abo utthe .rod32'engaging the post 35L atoneend "and a suitable collar lO on the rod 32 at the otherend. V

. From the foregoing itiis evident that I have produced a simple and efiective means whereby the batch skip. of a mixer or other similarly operative device may beelevated by a single thrust'of. a control lever; and its ultimate. functionihg'leit to the automatic operation of the mechanism. NVhen repeated action is desiredfrequiring the lowering of the skip, the same is.accomplished. by emanual manipulation of thelever 12to its-central position, "at which time neither brake nor power will be applie'd,.,perinitting the drum 8 to rotate freely upon. its shaf t,when, as isobvious, the g ravitating of the skip will unwind the drum, the speed and action of same being conveniently controlled by said lever. It will benot'e'd further that this mechanism. is exceedingly simple in operation and the possibility of error on the part of the operator reduced to a minimum in that whether the skip is to'be raised or low ered the operating lever is ,thrust'in the lever freed. v v

3.}The combination with flz'QQIICIGlZG mixer f v mcludlnga skip having means for raising direction, however but only slightly low ering the bucket; whereas a fullthrust of the lever must be accomplished to raise the ent, is

'lrIn a hoist, a lower terminal, an upper terminal anelement to be raised and low ered intermediate of'the terminals, amanually controlled hoisting mechanism for operating the element comprising alever, a

slidable member directly connected to the free end of said lever, a ,dogfor' normally holding the sliding member, and means carried by the element for disengaginggthedog liromthe sliding member when said element 1s in ltS extreme elevated position.

2. skip hoisting and control mechanism comprismg a winding drum-havingabrake and operating clutch associated therewith, a

Iclaim and desire to secure by Letters'Pathand lever for simultaneous controlofthe brake and clutch, a springfor normally hold- I ing the clutch disengaged and the brake engaged, means at the upper terminus oftravel of the skip directly connected to;the.;hand

lever comprising a slidabl e block, a spring controlled dog'tor normally holdin gflsaid;

block against movement, a rod forwithdrawmg the dog and means'carrled by theupper end of the skip for automatic engagement with the .rod whereby when the skip is in its dumpingposition the dog will he withdrawn, the brake released, and the openating and lowering same, of a: fork likelelement carried by the upper end of theskip fo,r

overreaching engagement with releasing V mechanism 'for stopping the hoistingaetion of the skip. P

, NILS M R ENDAHLQ

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