US906587A - Counterweight jib-crane. - Google Patents

Description

W. VAN WIE.

COUNTBRWEIGHT JIB CRANE,

APPLIUATION FILED 111111.14, 1908.

906,587. Patented Dee. 15, 1908.

2 SHEETS-SHEET 1.

W. VAN WIE.

GOUNTBRWBIGHT JI-B CRANE.

APPLICATION FILED MAR.14, 1908.

Patented Dec. 15, 1908.

2 SHEETS-SHEET 2.

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m. n az# \\'i\L'1`1\ll-t VAN W 11C, Ol" EAST OAKLAND, CALIF() RN 1A.

C OUNTE RWEIGHT JIB -CRANE Application led March 1%, 1908.

Specification of Letters Patent.

Patented Dec. 15, 1908.

Serial No. 421,222.

To all whom it may concern.'

Be it known that 1, '1d/*Aurea VAN 1171111, a citizen of the United States, residing at East Oakland, in the county ol" Alameda and Stato ot California, have invented new and useful Improvement in Counterweight Jib-Cranes, of which the following is a speci'ication.

This invention relates to a counter-weight `iib crane, the object et t-he invention being to facilitate 'the handlingI oi heavy f fastings or other weighty objects to be nioved by ineans ot a jib crane.

The invention consists in the novel leatures el construction hereinafter described, pointed out in the clainis, and shown in the accompanying drawings, in which- Figure 1 is a side elevation illustrati ng the. invention applied to a crane ol this type. Fig. 2 is a lront end view ot the device. Fig. I3 is a detail sectional view ol" a chain tightening device. Fig. l a detail. sectional view illustrating the inoun ting ot a counter-weight. Fig. 5 is a detail view showing in section the bearings tor a pulley.

Tn these drawings 1 represents a crane carried by a vertically arranged rotatable shaft 2, said shaft being inounted at each end in ball bearings, and the crane is braced by a brace rod 3 secured at one end to the tree end portion o1" the crane and at the opposite end journaled in roller bearings 3 carried by a convenient wall or post. Upon the crane 1 are journaled pulleys et, 5 and 6, the iirst two mentioned being adjacent the shaft 2 and the last inentioned being adjacent the tree end oi' the crane. A suitable track-block 7 is pivotally suspended at its forward end trein the crane 1 by a rod TtL and is provided with depending brackets 7b which lorin bearings for a threaded rod S operated by a grooved wheel 8a. The rear end portion et the track-block 7 is supported by a cable 9 and a chain 10. The cable 9 runs over the pulleys 5 and 6 and at its free end carries a chain section 9a having a hook 9b. The chain 10 runs over the pulley t and passes downwardly into a box 11, said box being provided with side openings 11EL adjacent its lower end out through which the chain 10 can pass. A threaded rod 12 having a handle 12a at its lower end works upwardly through the bottoni el the box 11 and at its inner end carries a hook l2" which can be engaged with any link of the chain 10. A pin 13 also works transversely through the box 11 the sides ot which are per- -forated to receive said pin, and the pin engaging the chain links will hold the chain taut, while disengaged Vl'roni the hook 12b. A chain 11 runs over the wheel S and by pulling upon said chain the wheel can be rotated thus rotating the threaded rod S.

1n operation the hook 9b can be engaged with the casting to be lil'ted or the chain 9 can be cast around said casting and secured in place by engaging the hook with one ol the links of the chain. 'lhe threaded rod S passes through a nut 15 carried by a hanger 16 which is provided with a roller 17 which travels upon the track-block 7 and the hanger 16 carries a counter-weight 1S. After the casting has been secured to the crane the rotation ol' the threaded rod S in the proper direction will 'cause the hanger 16 with the weight 1S to travel toward the rear end ol the track-block 7, thus lowering said end and liftingl the l'ree end portion of the cable 9 swingingv the work to be lifted clear ol the lloor. The work can be locked in lifted position by inserting the pin 13 through the box 11 through one ol the links ol" the chain 10. Vlhen the work is to be gradually and gently lowered the hook 12b can be engaged with a link ol" the chain 10 in the box 11 and the pin 13 removed. The counter-weight 1S can then be run back toward the lront end of the track-block 7 and the casting or other work being handled can then be lowered gradually by rotating 'the handle 12n so as to impart a vertical downward niovelnent to the threaded rod 12 thus drawing down the lower end of said chain 10 and lifting the rear end of the track-block 7 which perniits the cable 9 to run out over the pulleys 5 and 6, the descent of the work being very gradual. At any time during this operation the device may be locked by reinserting the pin 13 if it becomes necessary to get a new purchase of the hook 12a upon a higher link of the chain 10. The various other ways in which heavy articles can be handled by a device of this kind will be obvious to those skilled in the use ol" tracks, cranes and other loading and unloading devices.

Having thus fully described Iny invention, what I claini as new and desire to secure by Letters Patent is 1. The combination with a swinging crane, ot a track pivotally suspended at one end lroni said crane, a weight lnovable upon said track, pulleys carried by said crane and placed respectively upon opposite sides of the pivotal point olE suspension et the track, a cable secured to the track adjacent its free end and running over said pulleys, and means for locking the free end of the track against vertical movement in one direction.

2. A device of the kind described comprising a crane, a plurality of pulleys carried by said crane, a track pivotally suspended at one end from said crane, a hanger movable along said track, a Weight carried by the hanger, means for moving the Weight, a cable secured to the free end portion of the track and running over tWo of said pulleys, said cable passing the point of suspension of the track from the crane, a chain secured to the free end portion of the track and running over the remaining pulley, and a locking pin cooperating With said chain.

3. The combination With a swinging crane, a track pivotally suspended at one end therefrom, pulleys carried by the crane and upon opposite sides of the point of suspension of the track, a Weight lifting cable secured to the free end portion`of the track and running over said pulleys, a third pulley, a box open at the top and sides, a chain secured at one end to the free end portion of the track, said chain running over the third pulley and passing through the box, a locking pin adapted to pass through said box and through a link of said chain and a counter-Weight movable on the track,

4. rl`he combination with a crane, a track suspended at one end therefrom, a counter- Weight movable on said track, pulleys carried by the crane, a Weight lifting cable running over said pulleys, an additional pulley carried by the crane, a chain ruiming over said last mentioned pulley, said chain being connected to the free end portion of the track, a box open at the top and sides and receiving said chain, a threaded rod Workingvertically through the bottom of the box, and means carried by the inner end olfl said rod for engagement With links of the c am.

5. The combination With a jib crane of a suspended track, a counterbalance Weight upon said track, a lifting cable secured to a freely movable end portion of the track, a box open at the top and sides, a chain secured at one end to said track and passing freely through the box, a pulley for said chain, said pulley being mounted in a plane above that of the track, a threaded rod Working vertically through the box bottom, a hook carried by the rod for engagement With the chain links, and a pin Working transversely through the box and through the chain links.

6. A device of the kind described comprising a vertically arranged rotatable shaft, a crane carried thereby, pulleys carried by the crane, one of said pulleys being arranged adjacent the free end of the crane and the other two being arranged adjacent the shaft, a track-block pivotally suspended at its forward end from the crane, the point of suspension being between the 'first and last mentioned pulleys, a hanger traveling upon said track-block, a threaded rod Working through said hanger and moving the same along the track-block, a Weight carried by the hanger, a cable connected to the free end portion of the track-block and running over the first mentioned and one of the last mentioned pulleys, a chain secured to the free end portion of said track-block and running over the other pulley, a box carried by said shaft, the chain traveling through said box, a threaded rod Working vertically in the box, means carried by the rod for engagement with the chain, and means carried by the box independent of the threaded rodfor engaging the chain, as and forthe purpose set forth.

vWALTER VAN IE.

TWitnesses:

E. V. HARTMAN, D. E. CRoUoH.

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