US508155A - Hoisting-machine - Google Patents

Description

{No Model.)

I). S. WHITE. HOISTING MACHINE.

No. 508,155. Patented Nov. 7, 1893.

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UNr'rno STATES PATENT Erica.

DAVID S. WHITE, OF NORTHFIELD, ASSIGNOR TO J. B. MALING, OF MINNEAPOLIS, MINNESOTA.

HOISVTING-MACHINE.

SPECIFICATION forming part of Letters Iatent N 0. 508,1 55, dated. November 7, 1893. Application filed February 27, 1893. Serial'No. 463,907. (No model.)

, To all whom it may concern:

Be it known that I, DAVID S. WHITE, a citi zen of the United States, residing at Northfield,1n the county of Rice and State of Minnesota, have invented certain new and useful Improvements in Hoisting-Machines; and I do hereby declare the following to be 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 usethe same. My invention relates particularly to animprovement in the type of hoisting machines which are shown. and described in Letters Patent No. 461,005, granted to me October 13, 1891. Machines of this general character are of especial value in digging sewers and ditches, and in other similar work, where it is desirable to lift the load from the ditch and carry it back from said ditch before it is dumped.

The principal object of the present invention is to provide a construction with which the load, after being lifted, may be'quickly carried away from the ditch a greater distancethan is possible with the machine shown in the before mentioned patent, and

with which the parts may be very quickly returned to the position in which the bucket when lowered will descend into the ditch.

Another object of the improvement shown is'to brace the sliding derrick arm, so that it will not be bent when the load is being lifted. w

In the drawings, Figure l'is an end elevation of a hoisting machine containing my invention, and Fig. 2 is a front view of the same.

The apparatus includes a supporting framework A of suitable height, which I prefer to mount on a wheeled .truck H, whereby the apparatus may be conveniently moved from place to place.

Hinged to the upper part of the framework A is a swinging derrick member, which as shown, consists of the arm B adapted to overhang the framework, and the rearwardly projecting arm B. The arm B consists of two connected parallel arms bb, and each of these is connected by means of a brace B with the arm B. Two other arms 13 B are connected at their lower ends with the braces B and attheir outerends with the outer end of the arm B. The parts B are in effect a part of the arm B, and they mightv be omitted providing the pieces forming the arm B were made wide enough to accommodate the rollers c c to be presently explained.

In the upper end of the arm B the sliding derrick arm C is mounted in substantially the same manner that the similar arm is mounted as shown in the prior patent hereinbefore referred to; that is to say, the arm itself is curved and rests on agrooved roller 0 which is mounted in the outer end of the said arm B. A second roller 0 is also mounted in the arm B and lies aboveand bears against the upper side of the sliding derrick arm. On the inner end of the sliding derrick arm is formed a hook or stop, which, when said arm is projected as far as is desirable, engages with the roller 0 and prevents further outward movement of said sliding arm. A sheave c is secured to the outermost end of the sliding derrick arm, and the hoisting rope I passes over this sheave, and

over the elevated sheave F, which is mounted on the upper ends of the pieces D D, which are secured to the framework A.

The arm B lies beneath a fixed stop E, and, when the swinging derrick member is at the 'limit of its outward movement, this arm strikes against said stop, whereby the further forward movement of said swinging member is prevent-ed. I

G represents a spring made up of a series of elliptical springs g, the lower one of which rests upon a crossbar a on the framework. The upper elliptical spring is secured to a bar G, the upper end of which is hinged to the under side of the arm B, and which passes loosely through the crossbar (1, whereby said bar is guided. When the swinging derrick member is swung backward, the arm B moves downward, and in so doing, compresses the spring G. This spring therefore resists the backward movement of the swinging derrick member and acts in some degree as a cushion to prevent injurious jar. When the swinging derrick arm is at the limit of its backward movement, the arm B engages with the framework A, which acts as a stop. When the hoisting rope I is slackened, the spring G,

by acting upward against the arm B, causes the swinging derrick member tofso swing as to carry the upper end of the arm B outward and away from the framework.

Fig. 1 in full lines represents the position the parts would occupy relative to each other, when the bucket has been lifted Vertically out of the ditch. A stop 2' on the hoisting rope, engages with the outer end of the arm 0 and prevents the further movement of the hoisting rope over the sheave 0 A further pull upon the hoisting rope first causes the sliding arm to move upward and backward over the rollers c 0 until the brackets strikes the upper and outer end of the arm B. A

further pull upon the cable causes the swing ing derrick member to swing back on its hinge, after which the partsoccnpy the relativeposition shown by the dotted linesin Fig. 1. At this point the bucket may be dumped in a car or cart, which rests upon the ground between the base of the hoisting apparatusdeseribed and the monthof the ditch. It, will be noti'cedthat by the employment of the swinging derrick arm in connection with the other, parts as described, the bucket is movedflfarther back from the mouth of the ditch than it is i'n the apparatus shown in the priorpatent mentioned. I am thus able to support the apparatus in a position farther back from the mouth of the ditch than, I otherwise could, whereby thereisless danger that the weight of the'apparatusfwill cause thewallsof the ditch to cavein'fand thereis s mer r om be wee the a e e ppaj mand e, 1 1 1 f h d h .rare cart, which is usually employed toearry the fi wayg p, H .w W l new o rev n the We helo d, nfl basket r mb d s he 'slidingafhl. Q, I pivotjto the outer end of 'saidarm', a braeeK, composed oftwo parallel bars is.

These bars are'fconnectedfby pinwhich lies in an inclined sloth? on theuppe'r'edge of the frame A. This brace doesiniot inany way interfere with thedescrib'ed act-ion of the parts, butit does prevent the loadlfrombend ingth'e'arm C.

Having 'described my invention, I claim 1. Ina hoisting machine, in combination, a supporting framework, a movable derrick member hinged to said framework, having an arm B which is adaptedto overhang said framework, and rearwardly extended arm B,

a stop with which the upper side of said arm B is adapted to engage a spring thrusting against the framework" and against said arm B, whereby said arm is moved against said stop, a sheave in the outer end of said arm B, an elevated sheave carried by said frame, a hoisting rope which passes over said two sheaves, anda stop on said rope adapted to engage with the swinging derrick member to swing it inward, substantially as and for the purpose specified.

2. In a hoisting machine, in combination, a supporting framework, a swinging derrick member hinged to said framework having the overhanging arm B and the rearwardly extended arm B, a bar G hinged to said arm B, a guide forsaid arm, aspring secured to the framework and to the barGf, a sheave in the outer end of'said armB, an elewated sheave F, and a hoisting cable passing over said sheaves having a stopadaptedj to engage with the arm B, substantially asand forthe p po e refi fied- 3. In a hoistingmachine, in combination, a support ng r mew rk; a ne ita de i member hinged thereto having'a i, arm B a abt dlo pv r a gsa d m e k; a p fi s rtst sd h e'swins ril m mber'tocarry said arm outward, a sliding derrick arm' mounted in the outer end of. the arm B','having a sheave in u jbmesena, an ele ed a warmed by sa am work, stOpsWimi'PiBSithe movement of the wi in de ck m mbet sippsl im t n' movement of the sliding derrick arm; inflthe arm B, a hoisting rope which passes over said two sheaves, and a stop carried by saidrope 11 adap e enga w t he .oi e a of said sliding arm, s uhstantially'asand for the p pose Spec e 4. In a hoisting machine, in combination, & e nQ tinsramwq k an,Qverha gi s m Mira e p vo ed s ei 'te' l a to th ute end of said sliding derrick arii i; and haying at its lnnerenda fpin"whiehflies in aslot in saidfram'ework, subst pt' ally asand for the pres n of t W n sse DAVID,S, WHITE. itnesses E. L. THURSTON,

FRANCIS J. WING.

"In testimony whereof I aflix my signature in

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