US812244A - Steam shovel and dredge. - Google Patents

Description

VAfor hoisting the bucket.

"UNITED sTATEs PATENT oEEIoE.v l y GEORGE E. TURNER, BELLEFONTAINE, OHIO, ASSIGNOR TO THE BELLEFONTAINE FOUNDRY &

MACHINE COMPANY, OF BELLE- Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed February 27, 1905. Serial'No. 247,424.

To' a/ZZ whom, it may concern,.-

Be it known that I, GEORGE E. TURNER, a citizen of the United States, residing at Bellefontaine, in the county of Logan and State of Ohio, have invented certain new and useful Improvements in Steam Shovels and Dredges, of which the following is a specification.

My invention relates to improvements in steam shovels and dredges, and more articularly relates to the hoisting devices t erefor.

The object of the invention is to so simplify the apparatus as to cheapen it in construction and render it more economical and more efficient in operation.

Heretoore it has been the practice in sch constructions to use a chain rove three parts, It` has been the usual custom to pass the lead over a sheave,

over the foot of the boom, thence downward through the turn-'table and about a comparatively small sheave below the car-floor, and then u ward to the winding-drum. The use of a ca le for this purpose has been impractical on account of the excessive wear incident to the use of sheaves of small diameter made necessary by the lack of room. In view 'of this a further object of the present invention is to so train the cable lead that the use of sheaves of large diameter will be possible.

A further object is to provide for the use of twin hoisting-cables and provide means for equalizing the strain thereon, and, further, to provide protective means for said twin cables at the point most subject to danger of abrasion by stones, grit, &c.

In the drawings, Figure 1 represents a side elevation of a steam-shovel embodying my invention. Fig. 2 is a detail View ofthe pro tective housing. Fig. 3 is a side view of same. Fig. 4 is a detail view of a cable-sheave, showinv the double groove and twin cables.

zIn the drawings, a re resents the main portion of the structure, W 'chin the present instance is the car of a steam-shovel and corresponds to a boat-hull when the structure is in t e form of a dredge. An A-frame a is located on the forward end of said main portion adapted' to support the boom a2, the lower end of which is supported upon the turn-table a3 in the usual manner.

ai* is the bucket or dip er having the han-4 dle a5 and is adapted to be thrust forward or retracted by the engine a, located upon the boom.

The improved hoisting device consists of the single-lead twin cables b, the bight of which engages the sheave b', located within the housing b2, secured to the bucket or dipper a4 in lieu of the usual bail, thence over the sheave b3 of large diameter located at the upper extremity of the boom a2, thence downward and under the sheave b4, also large in diameter, located at the foot of the boom a, thence directly upward and over a large .sheave b5, supported in the A-frame, .and

downward to the winding-drum. The respective sheaves b3, b, and b5 are doublegrooved for the reception of the res ective strands of the cable b, as shown in ig.' f1, while the sheave b is of the single-groove type. The sheaye b4 at the foot ofthe boom a? and the sheave b5 in the A-frame a are arranffed tangent to the axial line of the. turntable in such a manner that the portion of the cables intermediatev the sheaves b4 and b5 will coincide with said axial line. By this arrangement the boom a2 may be swung to its limit in either direction without disarranging the cable b. By use of the sheaves b within the housing b2 the strain upon each member ot the twin cable will be equalized. The housing b2 is ada ted to prevent the entrance o1 grit between t e sheave b and the cable b, and thereby prevent the abrasion or wearing of the cable b at this point, to which there is a tendency through its proximity to the bank during the digging operation. y 0

It is to be understood that the same hoisting speed and oWer resulting from the rove chain is secure through the multlphcation of power by a series of gears at the windingdrum. As a matter of economy the cables b are such` as to be adapted to use upon the swinging drum and turn-table, as indicated -by c, when they have become too much worn for further use for hoisting purposes. By the use of a sheave of lar e diameter at the top of the boom. a better digging angle is secured between the hoisting-"cable and the dipper- .handle when the latter is at its lowest point,

where the power is usually least effective.

Having thus described my invention, I claim- 1 1. In a structure of the character described,

IOO

- a main portion, a swinging boom, a dipper, a

housing adjacent thereto, a sheavewithin said housing, a singleflead double hoisting-- cable, the bight of- Which engaofes said s heave and operating means for sald hoisting-cable, l

substantially as and for the purpose specified.

2. In a structure as described, a main portion, a swinging boom, and a superstructure thereon, doublegpooved sheaves arranged in saidboom and superstructure, a dipper, a housing adjacent thereto, a sm le-groove sheave Within said housing, a doub eholstingcable, the bight of Which engages with sald 4single-groove sheave, and Whichis led over GEORGE E. TURNER.

Witnesses:

R. F. TREMAIN, P. E. CORY.

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