US1837718A - Crane - Google Patents

Description

Dec. 22, 1931.

D. KENDALL ET AL CRANE Filed Aug. 51. 1928 3 Sheets-Sheet .ZZI

INVENTORS aye-m w. 42%

Dec. 22, 1931.

D. KENDALL ET AL CRANE Filed Aug. 31, 1928 3 Sheets-Sheet INVENTORS Dec. 22, 1931. D. KENDALL ET AL CRANE 3 Sheets-Sheet Filed Aug. 51, 1928 Patented Dec. 22, 1931 UNITED STATES j gi' NT ,rrcai DAVID KEND LL AND WALTER I). KELLER, or nLLIAiycE, onIo; Assl'errons TO THE AL- LIANCE MACHINE cor/many, or nn-Anon,- OHIO, A coarone'rron or OHIO i came Application filed August 31, 1928. Serial I Io'."3()3,192.

character are well known and have been in leg type, such as soaking pit cranes.

Cranes of this type comprise a trolley which carries a stifl leg having tongs at the lower end thereof. Cranes of this general use for many years. We provide a number of improved features contributing to reduction in cost of construction and operation and long life.

Our improved crane is provided with worm gear drives for the several operating mechanisms. Worm drives are of special value in a crane of this type and permitof a very simple driving connection. The motors are preferably mounted with their axes extending longitudinally of the trolley trucks as this insures proper alignment of the parts regardiess of the give of the trolley under load.

The stiff leg is provided with rack teethso that it may be raised or lowered through a gear or pinion engaging such rack teeth, and we provide a second set of rack teeth disposed opposite those first mentioned, this second set being connected with a gear which 5 acts as an idler. This prevents slippage of the stiff leg on the idler. After the first set of teeth has worn th'estiff leg may bereversed and the second set used for driving.

We mount the operating cage between the wheels of the trolley and so arrange it that it does not project any substantial distance beyond the wheels in the direction of travel of the trolley. In a crane of this type it is important to reduce to a minimum the distance which the stiff leg is spaced from the end of the crane-way when the trolley has reached the limit of its travel along the tracks. By placing the cage as above described it is possible to bring the stiff leg into very close proximity with either end of the crane-way.

In. the accompanying drawings illustrating the present preferred embodiment of the invention,

Figure 1 is a side elevation partly broken away of a stiff leg soaking pit crane embodying our improvements, I

Figure 2 is a top plan view,

Figure 3 is a section taken. on the line 111 111 of Figure 1,

' Figure 4 isa vertical section taken on the line IV-T-IV of Figure 3; and

Figure 5 is a'view largely diagrammatic takenat right anglesto the view of Figured and showing the stiff leg. i y

.In general',the crane shownin the drawings embodies many of. the features of the crane shown inthe patent. to 'Milo'Shutt, 1,487,032, dated March 18th, 1924. It cont prises atrolleymade of spaced trucks 'Qconnected by structural members 3, and each pror videdwith-trackuwheelsl and 5adapted torun on'spaced tracks T on the crane bridge. The wheels 4 are i dler wheels and the wheels 5 are driving Wheels- Each wheel 5 is provided witha'gear 6 meshing with a pinion 7 on a shaft 8. Theishaft 8 is driven through i gearing 9 from a trolleymotor 10. H i The operating cage .11, as best shown in Figure 3,, lies between the trucks 2 and does not extend any substantial distance beyond the-track wheeled. This materially reduces the amoun't of space ateither end of the run} way which'cannot be reached by the stiff leg. The stiff leg comprises a hollow casting 12 having rackteeth 13 formed on diametrically opposite sides. The'stiif leg is symmetrical about a horizontal center line, as viewed in Figure 3, so that it may be taken out, turned through 1809-and replaced. The stiff leg is.

raised and lowered by a pinion 1&1 onja shaft 15. Thezshaft 15- carries a loose sleeve 16 on whicha worm gear 17 is mounted, The worm gear mesheswith a worm wheeli 18'on thel'shaft of a motor 19. As best seen from Figure 3, the axis of the motor 19 extends longitudinally of the truck 2 upon which it isumounted. One end of thesleeve 16 is toothed. and engages a correspondingly toothed sleeve QOinfthe shaft 15. The shaft makes spline connectionv with the sleeve 20 and the teeth of the sleeve 20 areforced into engagament with the teeth of the sleeve 16 bya compression spring 21,- The mechanisin thus above described constitutes a slip 5 connection so that if the operator fails to shut I off the motor 19 when the stiff leg is lowered into engagement, with theingot to he lifted,

continued rotation of the motorwill not cause thet'rolleylto climb 'up the stiff leg no slippingcan take place between the two N This eliminates any wearing of flat spots and consequent looseness in the stiff leg. i

. The tongs 24; at thebottom of the stiff leg carry a gear 25 ine'shin' with a pinion- 26 on a square shaft27fexten ing longitudinally of the an leg. The shaft slides threuh a bevel gear 28 carried by the trolley and connected through a 'corresponding bevel gear to a "shaft '29. The shaft 29 is connected through worm gearingindi cated at 30 to a tongs'rotating motor 31.7 .The tongs rotatdirection operable upon attempted undue lowering of'the stiff leg. 7

2. A crane comprising a vertically movable stifi leg, a rackthereon, a reversible motor, gearing connecting the motor with the rack whereby the stiff leg may be driven upwardly or downwardly, and a slip mechanism interposed in the gearing, said slip mechanism comprising cooperating rotatable members havind inter-engaging teeth, the teeth having axially extending faces and inelined faces, and means yieldingly' urging the rotatablemembers together, said slip' mechanism rovidin a positive drivin con v 25 a b nection in one direction and a slippingconnest-ion in the other direction operable upon attempted undue lowering of the stiff leg.

In testimony whereof we' have hereunto set oiir hands. r

, DAVID KENDALL.

WALTER D. KELLER.

in'g motor is also mounted on one of the e ru'cks 2 and its axis extends longitudinally thereof.

The tongs opening and closing mechav n'ism is best shown in Figures 1 and 4. It comprises. le've'r arms 32 pivoted at '33 to the 1 towerstructure 34"of thetroll'ey The levers 32c2'1'rr; she-ave wheeis 3'5 and tongs "operating cab es 36 (se'eFigure 1) pass over these sheaves and "areconne'cte'd to an equ'aliz'er bar. ion the tongs "cl'osingrod 38. cables 36 extend from the'sheaves around sheaves 39 rotatable on the pivot shaft thence downwardly 1 around; sheave wheels 40 on a muster weight 41, and tnence upward- 1y to be dea'fc'he' n'ded at 42. The counter weight 'isconnec'ted through cables 13 runlene over sheave Wheels 44 to the. stifi leg.

The I levers 32, are connected through a heavy counter b'a'lancin ii'nir 45 ma crank 'p'i'nj46 'onhcranky. The crank 47 is-connecte'd through worm gearing 48 the tongs opening andel'osing motor49.- We have illustrated andd'escribed the present preferredform ofour invention, it is not limited to 't'his form alone, as it maybe The embodied withinthe scope of "the" following i claimsq Y e V Weehnn: v I H 1. A crane comprising a: stiff le'g"having a ra ekro'rmed thereon, a motor, a pinion engaging "the rack, gearing connecting the motor and the pinion, said gearing including a worm gear, and aslip mechanism-interposed V in the 'eari'ngsaid slip mechanism comprising'c'ooperating rotatablemembers having inte ngagi'n g teeth, "the teeth having axially ex tending face's "and "inclined faces, and V means y'ielding l'y urgingthe rotatable mem- 'be'is together, said slip mechanism providing a positive driving "connection in one direction and a slipping'connetion in'theother

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