US1282438A - Hoist. - Google Patents

Description

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HOIST. APPLICATION FILED DEC. 20, 1917.

Patented Oct. 22, 1918.

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W. LAMB.

HOIST.

APPLICATION FILED DEC. 20, l9I7- Patented Oct. 22, 1918.

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I HO'ISTQ. APPLICATION FILED DEC.Z0. 19!?- 1,282,438. Patented Oct. 22, 1918.

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HOIST. APPLICATION HLED DEC.20| 19H.

Patented Oct. 22, 1918.

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,UNITED STATES PATENT OFFICE.

WILLIAM LAMB, or nnmoir, MICHIGAN.

HOIS T.

Application filed December 20. 1917. Serial No. 208,097.

To all who/1t it may concern:

Be it known that 1, \Vitnian Lama. a citizen of the United States. residing at Detroit, in the county of \Vayne and State of l\'lichi;ran, have invented certain new and useful Improvements in Hoists: and I do declare tlie'following to a full. clear, and

exact description of the invention. such as will enable others skilled in the art to which it appertains to make and use the same.

()ne object of the present invention is to so improve upon the general constructimi and arrangement of steam and compressed air hoists,'as to provide a device which will be extremely simple and compact, yet highly etlicient and durable.

A further object is to provide an automatic shut-off for the hoist engines when the load has been raised to a predetermim-tl extent.

Yet another object is to provide a novel type of control valve for the several fluid pressure cylinders.

A still further object is to provide novel means for returning any oil to the engine which may possibly be blown therefrom with the exhaust steam or other lluid pressure used.

ll'ith the foregoinggeneral objects in view. the invention resides in the novel features of construction and unique combina tions of parts to be hereinafter fully described and claimed, the descriptive matter being supplemented by the accon'ipanying drawingswhich form 'a part- ,ot' this specification and in which Figure 1 is a front elevation of the improved hoist;

Fig. 2 is a sile elevation thereof;

Fig. 3 is a rear elevation;

F19. 1 is a central vertical section on the plane indicated by theline -1-1 of Fig. 1;

Figs. 5 and 6 are vertical transverse sections on the planes designated by the lines 55 and (3-43 respectively of Fi 4;

' Fig. 7 is a transverse section on the plane indicated by the line 78 of Fi 4. looking in the direction of the arrows (1 Fig. 8 is a sectional view on the line 78 of Fi 1, looking in the direction indicated by the arrows 7);

Fig. 9 is a detail perspective view illustrating a portion of the automatic cutout",

Fig. 10 is a side elevation of one ofthe engine cylinders with ,its heads removed;

Specification of Letters Patent.

Fig. 11 is a section of Fig. 10 on. the plane of the line 1111 thereof; and

Fig". 12 is an end elevationkfl' one of the cylinde s.

In the drawin s above briefly described, the numeral 1 designates a comparatively flat. vertically disposed casing which is preferably of circular formation; the front side 2 of the casing being removable as shown. A plurality of oscillating cylinders (preferably three) are positioned in the using 1 and the pistons l of said cylinders are provided with piston rods 5 connected to a crank ti on the inner end .of a horizontal shaft 7 which extends at its front end into the casing: 1. through the rear side of this casing. letwecn its ends. the shaft. 7 is provided with a worm H which meshes with a vertically disposed worm gear 9 on a horizontal shaft 10 mounted above and extending at right angles to the shaft 7. A horizontally elongated bearing 11 is bolted at 1: to the rear side of casing l. said hearing rotatably supporting the shaft 7 and having in its upper side a recess 1?) which receives the worm 8. said recess also receiving: a thrust bearing 14 which prevents the action of the worm h upon the gear 5) from shifting shaft T longrilmlinally.

The horizontal bearing 11 is formed intogrally with and constitutes the bottom of a second vertically disposed casing' 15 in which the worm gear 5) is positioned, said casing b ing secured to the rear side of casing 1 by screws or the like 16. It will be observed that casing 17 is disposed in a. verlical plane at right angles .to the plane in which the casing 1 is located and that said casing 15 is positioned on the-vertical center line of said casing 1. The opposite ends of the shaft 10 extend beyond the opposite sides of casing. 15 as shown clearly in Fig. 6 and a pair of winding drums 17 are $8- cured on said shaft. said drums being! located in the angles between the vertical aisiiigs 1 and 15. By this arrangen'ient. the device is rendered extremely compact and since the weight of the load is placed ,upon two cables wound upon the drums 17, the strain upon the supporting hook or the like 18 is substantially balanced so that little tiltin, of the hoists will occur.

Each of the cylinders 3 is provided with a'pair of trunnions 19 which are. rotatably the frontand rear sides and the sides of said the front side 2 of said with integral disks 20 which contact with said side. Springs 21 and adjusting caps 22 therefor are provided for forcing the of thecasing 1, cylnnlers adjacent casing. are formed cylinders tightly toward the plate 2, in order that said disks 20 may be held intight contact therewith; .Each cylinder is formed with a pair of ports 23, one being positioned at' each end thereof and both ports opening through the disks 20 for registration with other ports 24 which are formed plate 2 ofthe casing 1, the registration of these ports being controlled by the oscillation of the cylinders 3 in a well known manner.

A plurality of pairs of radial ports 25 lead inwardly from the ports 24 and at 26, said ports 25 open through the outer side of the front plate A preferably circular valve chest 27 is secured to the plate 2 on the exterior of the latter and surrounds the several inner ends 26 of the clear from Figs. 4. 7 and 8. and said plate 2 is formed with an annular exhaust 28 positioned within said chest 27. An exhaust passage 29 leads from the channel 28 as shown most clearly in Fig. 4. the upper end of said passage discharging into a muffler 30 whose construction will be hereinafter described.

Positioned in the 'alve chest 27 is a valve disk 31 which is mounted rigidly on the inner end of a short horizontal rock shaft 32, the inner face diskbeing disposed in contact with the outer face of plate 2 and being formed with an annular recess 33 with which the annular channel 28 registers. Disk 31 is also'provided with a plurality of lugs 34 extending into the recess 33, and ports 35 are formed through said disk and through the lugs for registration with the inner ends 26- of the passages or ports 25. There are half as many ports35 as 25 and the former are equal in number to the cylinders 3. Fluid under pressure is admitted to the chest 27 by a suitable pipe 36 and when the valve disk 31 is properly set. this pressure will pass through the ports above described to drivethe engine in a manner to be hereinafter fully descri bed.

ports 2b,

Normally the valve disk 31 is so positioned hat its ports 35 are midway between the so that the engine remains at. a standstill. lVhen, however, the rock shaft 32 is turned in one direction, iheports 35 will conduct the fluid under pressure from the chest 27 to certain of the passages 5 from which it will enter the proper end of cylinders 3, through the ports 24. which lappen to register with the ports 23 of said cylinders. The pistons '4 are thus operated ports 25 as will be to turn the shaft 7 and the oscillation of the cylinders controls the admission and exhaust of the fluid as is well known. When pressure is being supplied the cylinders through one of their ports 25 the other of such ports acts as the exhaust passage and discharges into the recess 33. From this recess, the exhaust. pressure enters the annular channel 28 and is conducted from the latter to the mutlier 30. by means of the exhaust passage 29.

. or operating shaft 32, a horizontal lever 40 is rigidly secured at its center to said shaft, the ends of said lever cxtcnding preferably beyond the edges of the casing l and )eing provided with depending pull rods or cables 41. whereby the lever may be rocked in either direction to control the direction of rotation of the shaft 7. For holding lever 40 in neutral position, a well known type of spring pressi-al keeper 42 is enlployed, said keeper being mounted on a guide 42 which is preferably though not.

necessarily formed integrally with the valve chest 27 as will be clear from Figs. 1 and 4. In case the operator should fail to cut olf the fluid supply to the engine, when the load maximum amount. it becomes highly expedient'to provide an automatic cut-out, and although I am aware that similar devices have heretofore been de vised. I have provided the following novel construction for attaining this end.

A horizontal trip lever 43 is fulcrmned at one end of the rear side of the casing I as indicated at 43'. said lever extending beneath the winding drums l7 and having between its ends a shoe 44- adapted to be struck by the block to which the cables are attached. whereby said lever will be rocked upwardly from the lowered position of Fig. 3. 'l ie central portion of lever 43 is preferably bowed outwardly as shown at 45, to clear one ofthe adjusting caps 22 and also to position the shoe H for better engagement with the block or other part with which it is-adaptcd to cooperate. The end of lever 43 opposite its fulcrum 43, is pivotally connected by a link or the like 46 to a trans mitting lever 4.7 fulcrmned at 48 to a lug or the like 49 formed on the edge of the casing 1-.

is given a quarter turn to form an eye 5!) through which one of the cables or the like 41 passes as shown clearly in Figs. '1, 3 and t). Thispart 41 is equippcdwith a stop 51 and when the lever 43 is operated in the manner above set forth, it will transmit movement to the lever 47, with the result that the eye 50 of the latter will strike the no sl, so that the rod or the like 41 upon which the stop is carried, will pull dmvnwardly upon the lever 40, thus so rocking this lever as to set the valve 31 in a position to cut off the between its ends The front end of lever sunnly of fluid to the cylinders, thus bringing the engine to a standstill without injury could be employed in connection with the machine above described, this muflier is preferably constructed as shown in Fig.4,that is of a lower bowl-shaped section 52 and an upper dome-shaped section 53, the two sections being suitably secured together in spaced relation. The center of the section 52 isprovided with an inlet 54 communicating with the passage 29 through a suitable nipple 55 and an upstanding wall 56 is formed around said inlet 54. The upper section 53 is provided with an annular depending flange 57 of greater diameter than the wall 52 and it will be obvious that the provision of these two parts will check the outrush' of exhaust steam or compressed air. The result is that any oil which would otherwise escape with the exhaust, will drop onto the bottom of the section 52, such oil being returned to the casing 1 by a suitable vertical tube or the like 58, whereby the oil whichwould otherwise be wasted, is utilized for further lubrication ofthe interior parts.

From the foregoing, taken in connection with the accompanying drawings, it will be obvious that although my invention is of extremely simple and compact nature, it will be highly efiicient and durable. Since probably the best results are'obtained from the several specific details shown and described, these details are preferably employed, but I wish it understood that within the scope of 'a winding drum in rear thereof, means in said casing for driving said drum, a lever fulcrumed at the front of said casing for controlling said driving means, one end of said lever extending beyond said casing, a trip lever fulcrumed at one end to the rear side of said casing, the other end of said trip lever extending beyond said casing, and a transmitting lever extending transversely of the other levers and fulcrumed between its endsto said casing, the ends of said transmitting lever being operatively associated with the projecting ends of said control and trip levers, said trip lever being disposed beneath the drum for actuation when the load is raised to the maximum. o

2. In a hoist, the combination of a casing, a winding drum. in rear thereof, means in said casing for driving said drum, a lever fulcrumed at the front of said casing for controlling said driving means, one end of said' lever extending beyond said casing, an operating member depending from said projecting end of said controlling lever, a trip lever fulcrumed at one end to the rear side of said casing and positioned beneath said drum, a trz tnsmitting lever extending transversely of theothers and fulcrumed between its ends to said casing, a pivotal connection between the rear end of said transmitting lever and said trip lever, the front end of said transmitting lever having an eye through which the aforesaid operating member slides, and a stop on said operating member in the downward path of said eye, the intermediate portion of said trip lever being bowed outwardly and having a shoe adapted to be struck when the load is raised to the maximum.

In testin'iony whereof I have hereunto set my hand in the presence of two subscribing WILLIAM LAMB.

witnesses.

Witnesses FRED MACDONALD, A. G. SAEOKE.

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