US1304381A - Crane safety device - Google Patents

Description

R. H. SCHEIBERT.

CRANE SAFETY DEVICE,

APPLICATION FILED OCT. 4, I918 1,304,381 Patented May 20, 1919.

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Attorney R. H. SCHEIBERT.

CRANE SAFETY DEVICE.

APPLICATION FILED OCT. 4, ma

1,304,381. Patented May 20, 1919.

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Attorney R. 'H. SCHEIBERT. CRANE SAFETY DEVICE.

APPLICATION FILED OCT. 4, 19I8.

PaIented May 20, 1919.

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UNITED STATES PATENT orrron.

RUDOLPH H. SGHEIBERT, 0F CINCINNATI, OHIO.

CRANE SAFETY DEVICE.

To all'whom it may concern:

Be it known that I, RUDOLPH H. SOHEI- BERT, a citizen of the United States, re siding at Hartwell, Cincinnati, Hamllton county, Ohio, have invented certain new and useful Improvements in Crane Safety Devices, of which the following is a specification. 1 a I This invention, pertaining to crane safety devices, relates to devices for automatically arresting the travel of .the crane bridge along-the crane track so as to render safe for workmen that portion of the floor which in the absence of the safety devices might he traveled over by the crane bridge with its hook or a suspended load.

The invention will be readily understood from the following description taken in connection with the accompanying drawings in which:

Figure 1 is an elevation of the outside face of a pair of the columns supporting the crane track.

Fig. 2 an inside view of one of the columns:

Fig. 3 a vertical section of a portion of the crane track, in the plane of line a of Figs. 1 and 2:

Fig. 4 a similar vertical section in the plane of line b of Fig. 1: and

Fig. 5 a diagram of an exemplifying circuit.

In the drawings:--

1, indicates a series of columns arranged to support the crane runway:

2, one of the longitudinal rails of the crane runway, supported by the series of columns 1:

3, the crane-bridge mounted to travel on the crane runway and adapted to have the usual hoisting trolley travel upon it transversely of the runway:

4, one of the conductors supported paral lel with the rail 2:

5, the second similar conductor:

6, a shoe carried by and traveling with the crane-bridge and making constant contact with conductor 5:

7, a second shoe carried by the cranebridge and making constant contact with conductor 4:

8, one of the conductors, leading from the shoe 6, and adapted for connection with the motor on the transversely traveling trolley:

9, the other conductor, adapted to place Specification of Letters Patent.

Application filed October 4, 1918.

Patented May 20, 1919.

Serial No. 256,787.

the shoe 7 in communication with the trolley motor:

10, one of the incoming mains to convey current to conductor 5:

11, the other incoming main, adapted to convey current to conductor 4: and

12, an automatic overloadcircuit-breaker disposed in main 11, this over-load circuit-- breaker being preferably mounted on one of the columns.

Theparts thus far referred to may be as usual in electric traveling cranes and are subject-to any of the usual modifications in such cranes. Current from the mains 10 and 11 supplies current to the conductors 4 and 5, which current is taken up by the shoes and transmitted through conductors 8 and 9 to the motor of the trolley.

I Proceeding with the drawings:

13, indicates short conductors placed at intervals along the crane runway, parallel with the conductors 4 and 5, these short conductors being adapted, as the crane moves along the runway, to make contact with the shoe 7:

14, a conductor leading downwardly from each of the short conductors 13:

15, a conductor leading downwardly from conductor 5: and 16, a normally open switch placed, preferably, near the foot of each of the columns and adapted to connect conductors 14 and 15.

The switches 16 and the automatic circuitbre'aker 12 are to be preferably arranged on the colurrms and within suitable inclosing casings. There may be one of the short conductors 13 'at each of the columns, each having its switch 16.

Normally switches 16 are 0 en, and short conductors 13 are without 0 0c, the shoe 7 passing over them idly. But if it happens that workmen be engaged on the runway or on the floor at some certain point passed over by the traveling bridge, and there would ordinarily be danger that those workmen would be struck by the hook or suspend-. ed load carried by the traveling bridge, it is simply necessary to close the switch 16 at a column between the territory to be protected and the traveling bridge. The closing of such switch causes the motor of the crane to be short circuited when the bridge reaches the appropriate one of short conductors 13,

thus rendering it impossible for the bridge to travel over the protected territory. If

the bridge is subject to momentum enough to cause it to encroach upon the protected territory after the current of its motor is short circuited, such possibility may be guarded against by utilizing the switch 16 at a point farther from the protected territory. lhe automatic circuit-breaker 12 may guard the circuit when any one of the switches 16 is closed.

1. A crane safety device comprising, a crane runway, a bridge fitted to travel thereon, a pair of conductors arranged parallel with the runway, shoes carried by the bridge and adapted to traverse the two conductors, conductors adapted to lead current from the shoes to a motor carried by the bridge, mains connected with the pair of conductors, a series of short conductors arranged along the runway and adapted to be engaged by one of the shoes of the bridge as the bridge reaches one of the short conductors, stations arranged accessible from the floor along under the runway, conductors lead ing from the stations to the respective short conductors and to one of the pair of conductors, and a switch arranged at each station to control the action of the short conductors, combined substantially as set forth.

2. A crane safety device comprising, a

crane runway, a bridge fitted to travel thereon, a pair of conductors arranged parallel with the runway, shoes carried by the bridge and adapted to traverse the two conductors, conductors adapted to lead current from the shoes to a motor carried by the bridge, mains connected with the pair of conductors, a series of short conductors arranged along the runway and adapted to be engaged by one of the shoes of the bridge as the bridge reaches one of the short conductors, stations arranged accessible from the floor along under the runway, conductors leading from the stations to the respective short conductors and to one of the pair of conductors, a switch arranged at each station to control the action of the short conductors, and an automatic circuit-breaker disposed in the mains, combined substantially as set forth.

RUDOLPH H. SCHEIBERT.

WVitnesses:

LOUISE A. MINNES, FRANCIS W. MINNES.

Copies of this! patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

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