US820844A - Hoisting apparatus. - Google Patents

Description

No. 820,844. PATENTED MAY 15, 1906.

W. H. BALDWIN. HOISTING APPARATUS.

APPLICATION FILED MAR-l7, 1905.

.' SHEETS-SHEET 1 15371226541 ZcZw/i/z,

PATENTED MAY 15, 1906.

W. H. BALDWIN. HOISTING APPARATUS. APPLIUATION FILED MAR. 17. 1905 2 SHEETS-SHEET 2.

PATENT OFFICE.

WALTER H. BALDWIN, OF CHICAGO, ILLINOIS.

HOlSTlNG APPARATUS.

Specification of Letters Patent.

Patented May, 15, 1906.

Application filed March 17, 1905. Serial No. 250,534.

To all whom it may concern:

Be it known that 1,,WALTER H. BALDWIN, a citizenof the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Hoisting Apparatus, of which the following is a s ecification.

My invention re ates particularly to safety appliances for hoisting mechanism of the nying drawings, in which Figure 1 represents a plan view, partly in section, of hoisting mechanism equipped with. my safety appliance Fig. 2, a partial section, on. an enlarged scale, taken as indicated at line 2 of Fig. 1; and Fig. 3, a broken section taken as indicated at line 3 of Fig. 2.

In the construction shown, A represents a frame having journaled therein three parallel shafts B, C, and D. Power may be communicated to the shaft B from an engine (not shown) through the medium of a sprocketwheel- I). A pinion b fixed on the shaft B, meshes with a gear 0, journaled on the shaft C, and a pinion 0, fixed on the shaft C, meshes with a gear (Z, fixed on the shaft D. Journaled on the shaft D is a drum E, to which is applied a hoisting-cable c. Secured to the drum at one end thereof is a fricti0n-wheel e, to which is ap lied a brake-band 6 controlled by'a roc r-shaft e arm 6 and handwheel-equipped screw e 111 the usual manner. The usual manually-operated clutch mechanism F serves to connect the drum to the shaft D atwill.

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Shiftably keyed on the shaft is a brakewheel G. to which is applied a, brake-band 9. As shown, the key 'g of the wheel G works in a transverse slot 9 in the shaft C and serves as a medium for shifting the wheel G. The Wheel G is equipped with an annular friction member 9, which works in a groove in the side of the gear c,-whereby the gear may be locked to rotate the shaft C through the medium of the wheel G. A spring g tends normally to separate the gear and brake wheel, and a screw 9 equipped with a handle serves to force the brake-wheel against t e gear.

The brake-band g has one end joined by rods g to the long arm-of an automat- 'ically-acting brake-lock g comprising a rock member 9 journaled in bearings g and a spring g, connected with the member g and with a stationary support. The brake-band has its other end joined by a rod 9 to the short arm of the member 9". As shown, the member g really has its arms divided into four parts, between the middle two of which is secured the rod 9 and between the two in termediates and the outer parts of which are secured the rods 9 the rod 9 passing between the rods g". A pin 9 serves as a pivotal connection for therods g and a pin 9 serves as a pivotal connection for the rod 9, and it is to be observed that the pin g? is closer to the axis so of the member 9 than is the pin g. The spring g tends to hold the pin 9 depressed, and a stop g, carried by the membet 9 by engagement with the frame member g"?, which supports the bearings 9 positively limits the rotation after the spring g has acquired a certain ex ansion.

The manner of use wil be readily understood. Power may be communicated to the shaft B from a gasolene-enginesay located at any convenient point. After the o erator starts the engine he turns to the mec ianism shown, and after first making sure that the brake-band e is loose he turns the handle g and couples the gear 0 to the brake-wheel G and so to the shaft C. The clutch mechanthereby ca :1 sing the friction upon the band 9 to act wi: w the spring (1 and cause the strap to grip the brake-wheel G, which would thereby effectually hold against retrograde movement. Inasmuch as the )inion 0' acts on the large gear (I, itis obvious t at the-drumshaft is held with multiplied force. It is understood, of course, that when it is desired to lower a car the drum may be disconnected from its clutch and controlled manually by its direct brake through the hand-wheel on the screw a In case of much a mishap as would al IIO Whatregard as neW, and desire to secure by Letters Patent, is l. The combination With a drum-shaft, a drum journaled thereon, a clutch for the drum, and a manually-controlled brake for said drum, of a shaft geared to the drumshaft, and anautoniatic brake for said second-named shaft which permits rotation in the winding operation and automatically grips to prevent reverse rotation, for the purpose set forth.

2. The combination With a hoisting-drum, of a driving-shaft geared to the shaft 01 the drum and equipped with a loose gear through which it may receive power, an adjacent shiftable brakeheel keyed on the driving-shaft,

a friction-clutch between the gear and brake Wheel, means for shifting the brakewvheel, a

brake-strap, a pivoted looking member with which the respective ends of the brake-strap are connected at difierent distances from the pivot of the locking member, and yielding niean's actingin a direction opposed to the force exerted by, the brake-strap upon the long arm of the looking member and serving, when the direction of the brake-wheel is reversed, to effect locking of the brake-Wheel, for the purpose set forth.

WALTER H. BALDWIN. In presence of- M. S. MACKENZIE,

J. H. LANDES,

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