US1182757A - Hoist. - Google Patents

Description

V. DEGERSTEDT.

HOIST.

APPLICATION nuzu FEB. 1-0. 1913.

1,182,757. Patented May 9, 1916.

2 SHEETS-SHEET I.

WITNESSES INVENTOR 2m WW v. DEGRSTEDT.

HOIST.

APPLICATION FILED FEB. 10. 1913.

,1, 182,757. Patented May 9, 1916.

2 SHEETS-SHEET 2- WITNESSES: A i W W INVENTOR,

7 BY WW;

VICTOR DEGERSTEDT, OF PORTLAND, OREGON.

HOIST.

Specification of Letters Patent.

l'atentod May 9, 1916.

Application filed February 10. 1913. Serial No. 747,271.

Ht it known that l. \ae'ron l)utzuus'liaivl', a citizen of the l nitcd States; residing at lortland. in the county of dlultnomah and State of Oregon. have imcnted certain new vided, it

and u eful linprovcnu-nt in llois'ts. of which the following i a pecification.

i\l v lIi-.tl|llul\ relates to hoists and has for its ohject. primarily. the utilization of a dri\iu memhcr that is constantly rotative in one direction for (tuning the hoist when in two independent hoisting members or drums are made subject to the perfect eonti'til of an operator. so that the) may lit: made. without interruption of movement of the dri\in mc|nhcrs to raise or lower a load at with or to shift it to any desired position anynlu'lc within predetermined limits.

A secomlary object of my invention is to provide certain new and useful mechanism for the accomplishment of the primary ole jeet dcscrihed.

What. constitutes my invention will he hereinafter specified in detail and succinctly set forth in the appended claims' In the ;\('t't)lli|):tll \'ltlf drawings which constitute a part of this specification. Figure 1 is a plan view of my hoist with its ropes omitted. Fig, 2 is a diagrammatic side elevation of the same. Fig: I") is a perspective view. partially diagrammatic. of the mast and hooms' which are employed, in practice, in the use of my hoist. and hy the aid whereof the cllicacy of said hoist is made available. in this figure are shown the flexihle members or ropes of my hoist.

Referring to the numerals on the drawings, 2 indicates the base or frame of my machine. driving member rotative in one direction is conveniently carried on the frame 2 and is represented by the shaft 4. it is illustrated as driven by explosive engines 3. Such engints as well as electric motors. are, from their nature, operatively limited in respect to the application under consideration. to a motion in one direction. It is in large measure to meet this liinitation in practice that my present invention is designed and adapted.

omitting all further de't ls of means em ployed. and welt known in themselves for driving the shaft,- i. save only a bare refer ence to a clutch it. which is prefe d7: pro: specified that shaft is connected. as by a pair of gears G and 7, to a shaft 8 mo'inted on the frame 2 preferably in parallel relatitmship to the shaft 4. The shaft H may he regarded equally with the shaft "l" as the driving member of my hoist since the only material distinction, is that the former is a step further removed fronrthe power which drives them both.

lroosely mounted on a common shaft 2.4. to which is preferably fixed an intcri'nediate driving gear 10. common to both of them :use two drums 11 and 12. The gear 10 derives motion from a pinion it on the shaft 8 amt drives the drums independently 01 each other tlu'ough coaction of any usual or preferred frictional or other clutch mechanism with which the opposing forces of the gear it) and the drums, respectively, are provided.

llach drum is made opcratively to engage the gear by means of its movement lengthwise of the shaft .24. The details of the mechanism for operating the drums includin that for shifting them longitudinally on the shaft "14 may he of any variety well known in the art and do not, for that reason, require further description or more than the diagrammatic illustration given. Suffice it to say. in this connection. that the shifting motion of the respective drums with the effect above referred to of causing: them to rotate with the gea r it) is imparted by radial movement upon the drum shaft 24 of cranks 20. one of which is provided for each drum. Normally the drums run free of the gear 10 upon their shaft.

A shaft 17 is mounted upon the frame 2 parallel to the shaft 8. It carries'toward its opposite extremities within the sides of the frame two loose sleeves 18, which are connected as by respective links 19 with the cranks 20 one with one crank and the other with the other crank.

Each drum is provided with an independ ent brake represented by a brake-strap l3 bent; about a bearing face on one flange of its drum and having its ends fastened to a lever 22 pivoted to a cross-rod in the frame "2. The movement of each lever upon its pivot serves to apply or release its brake strap to or from drum. A link 21 opera tively connects one lever '2 with a crank 26 mounted on the shaft and a second link 21 connects in like manner a second crank E i, and the other lever 22. The cranks are independently: operable by separate pedals 16 loosely fixed upon the shaft 17 between the sleeves 18. Each of the sleeves 18 car ries a crank "27 to which its respective connection with the links 19, above referred to, is made, and each sleeve has its separate handlever 15. By aid of the sleeves the collocation in close correlative assemblage of the two pedals 16 and of the two hand-levers 15 is made possible, whereby an operator seated upon a support or seat 13, properly disposed upon a bracket 14 projecting from the frame 2, is enabled to maintain under all conditions in service such complete operat ive control of the machine as will be hereinafter more fully explained in the description of the operation thereof. I

In Figi 3 the flexible members or ropes 39 and43, which it is the function of the drums 11 and, 12, respectively to wind and unwind,'but which, for clearness, are omit ted from the preceding figures, are shown. The desired operation of the machine depends upon the relative disposition of it's ropes with respect to the load to which they are attached and which may be attained through the employment of a mast and boom arrangement, which although, in itself, of familiar use in connection with hoisting niachinery, it is deemed to be conducive to clearness in this specification to illustrate and describe.

Proceeding accordingly, 31, in Fig. 3, indicates a mastwhich is planted upon any suitable floor or deck 32. It carries near its foot a collar 33, adjustable as required, which supports the lower ends of a pair of booms 34 and The booms may be adjusted to any desired angle of inclination toward the mast as by halyards 36. Guys 37 serve to retain the booms at a desired limit of expansion from each other that is fixed as by an intermediate or stretcher rope 38. i

U on such a boom construction as the one described, a rope 39, is led by pulleys 40 and 41 from the drum 11 to aload engaging member or hook 42, to which also arope 4:3 is led by pulleys 4A and 45 from the drum 1?. The load 46 upon the book 42 depends from the two ropes 39 and 43 that are united by the hook.

From the foregoing it will be apparent to one skilled in the art in considering the operation of my machine, that if the ropes 3S) and 43 be arranged to wind upon their respective drums when under driving control, they will unwind under the action of the gravity of the load it, either conjointly or separately, whenever both or either of the drums is released from its driving gear 10.

A third factor in determining the relati\'e lotion of the ropes upon the load is intro duced by the enig doyment of a brake for each drum, whereby not only may the more ment of both drums be interrupted, at will, upon the disengagement of both from the gear 10. but also one drum may be held sta tionary while the other is being: driven in one direction or the other, either by the action of gravity, through the weight of the load. or by that of lhe gear U).

lt will now be evident that by the use of my machine the load may be lifted from any point. at which it may be reached by the hook l2, and may then be, through the resultant oi forces. operator; upon it. do sited will... practical precision to any desired position located between verticals let fall from the pulleys ll and l5. Furthc'morc it being new obvious that the various forces that are utilized in the operation of my machine are controlled exclusively by means of the two hand levers l5 and the two pedals 16, it must also be apparent that each oi the ii. members last named must be under in control while the machine is under penalty of 'ncurri machine or to its load. 'l' trol indicated in the last sentence, may rot behad unless each of said four member so kept constantly under the hand or foot of the operator that is a 'ipihpi" to it, no shiftingof the inn-ids or fee 1g practicable in the operative control oi the machine. in order that both hands and both rot in" be so appropriated and each ready for instant service, the seat l3 becomes not a. mom ber of convenience, out one of necessity, without which the machine impracticable and useless for performing those functions for which it is designed.

The collocation of the hand l5 and pedals 16 in close assemblage within operative proximity to the operator or in other words, to the seat l3, is for like reason equally essential.

It may not be improper *0 add, not only, that skill in the operation of the machine rerniires the operator to observe constantly the hang of the load 14} so as to keep its weight duly t listrihuted upon both ropes 39 and 43, but also that, by reason of my invention, such experlness is readily attailr able by a competent man.

lVhat 1 claim is:

1. In a hoist comprising frame, a driving shaft, a pair of drums, means for engaging and disengaging, at will, said shaft and drums, and means for braking and re leasing either or both of said drums when disengaged from said shaft. the combination with a shaft carried by said frame, of our movable members respectively connected with said respective means and dcmanding exclusive appropriat" 1 ol both hands and feet of the operate; the same ti: 9, said members i ml upon said llO independently at the same time by the hands and feet of a single operator, substantially as and for the purpose specified.

2. In a hoist comprising a frame, a driving shaft, a pair of drums, means for engaging and disengaging, at will, said shaft and drums, and means for braking and releasing either or both of said drums when disengaged from said shaft, the combination with a shaft carried by said frame, of pedals movably incorporated upon said shaft with said means for braking and re leasing, sleeves also movable upon said shaft and operatively incorporated with said engaging and disengaging means, and hand levers upon said sleeves, respectively, said pedals and hand levers being collocated in close correlative assemblage to an operators support provided upon said frame and operable in parallel planes.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

VICTOR DEGERSTEDT. Witnesses:

W. PIGKERING, PETER HABERLIN.

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