US1048520A - Balanced safety-crane. - Google Patents

Balanced safety-crane. Download PDF

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Publication number
US1048520A
US1048520A US71289112A US1912712891A US1048520A US 1048520 A US1048520 A US 1048520A US 71289112 A US71289112 A US 71289112A US 1912712891 A US1912712891 A US 1912712891A US 1048520 A US1048520 A US 1048520A
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Prior art keywords
load
crane
drum
shaft
cable
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Expired - Lifetime
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US71289112A
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George B Garst
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/72—Counterweights or supports for balancing lifting couples
    • B66C23/74—Counterweights or supports for balancing lifting couples separate from jib
    • B66C23/76—Counterweights or supports for balancing lifting couples separate from jib and movable to take account of variations of load or of variations of length of jib

Definitions

  • GEORGE B GARST, OF ROANOKE, VIRGINIA.
  • the object of this invention is to provide that type of crane which embodies a vertical mast rotatable on vertical pivots and provided with a lateral projecting jib, with simple means whereby the load is balanced or partly balanced by an overhead counterbalancing weight, whereby the load may be raised and lowered with ease.
  • a designates the vertical mast and b the jib, the mast being supported in a step bearing and by a vertical hollow shaft c at its upper end, the shaft having a rotatable bearing in a suitable frame beam d.
  • the usual load cable e is wound upon the usual load drum y, and this drum f is rotated in either direction by means of a suitable hand cank g attached to a shaft L, said shaft being geared to the shaft of the drum f by means of a pinion z' and a gear j.
  • the shaft L is provided with a drum on which is wound the balancing cable Z which extends up through the shaft c and over one or more pulleys m suspended from an overhead support, the end of the cable being provided with a pendant counterweight n.
  • the shaft L is provided also with a pair of oppositely facing ratchet wheels o, and co-acting with the respective ratchet wheels is a pair of oppositely facing pawls p connected by a bow-spring g, this pawl arrangement being a well known device adapted to simultaneously and alternately throw the pawls into and out of action, so that one of the pawls may be adjusted to lock the drum 7c against rotation through the pull by the balancing cable while the other pawl may be adjusted to lock the drum 7c against turning through the action of the load pulling on the load cable and transmitting the power through the gear wheels.
  • the load sustaining pawl is in action While the other pawl is out of action, so that the apparatus is in position for raising the load and the weight fn is brought into counter-balancing action with relation to the load during the act of raising the load, the balancing cable being paid oif the drum /c as the load is raised.
  • the pawls are shifted and the opposite pawl then engages the other ratchet wheel, as shown in dotted lines in Fig. l; the load can then be lowered by rotating the shaft 7c in the direction to wind up the balancing cable Z, as is obvious.
  • a crane consisting of an upright mast rotatably supported, the supporting means at the upper end consisting of a hollow shaft, a jib attached to said mast, a load drum and load cable supported on the mast and the jib, a load counter-balancing drum mounted on said mast, gearing connecting said two drums and means for rotating the drums in either direction, and a cable mounted on said load balancing drum and extending up through said hollow shaft and having a weight attached to its depending end, and suitable pawl and ratchet means for said drums.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Description

G. B. GARST. BALANCED SAFETY CRANE. APPLIQATION FILED AUG. 2, 1912.
Patented Dec. 31, 1912.
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GEORGE B. GARST, OF ROANOKE, VIRGINIA.
BALANCED SAFETY-CRANE.
Specication of Letters Patent.
Patented Dec. 31, 1912.
Application vtiled. August 2, 1912. Serial No. 712,891.
To all whom, t may concern:
Be it known that I, GEORGE R. GARsT, a citizen of the United States, and a resident of Roanoke, county of Roanoke, State ot- Virginia, have invented certain new and useful Improvements in Balanced Safety- Cranes, of which the following is a full and clear specification, reference being had to the accompanying drawings, in which Figure l is a side elevation of a crane of ordinary type provided with my invention, a part of one of the ratchet wheels being Fig. 2 an elevation of the rear side of the crane.
The object of this invention is to provide that type of crane which embodies a vertical mast rotatable on vertical pivots and provided with a lateral projecting jib, with simple means whereby the load is balanced or partly balanced by an overhead counterbalancing weight, whereby the load may be raised and lowered with ease.
In the drawing a designates the vertical mast and b the jib, the mast being supported in a step bearing and by a vertical hollow shaft c at its upper end, the shaft having a rotatable bearing in a suitable frame beam d. The usual load cable e is wound upon the usual load drum y, and this drum f is rotated in either direction by means of a suitable hand cank g attached to a shaft L, said shaft being geared to the shaft of the drum f by means of a pinion z' and a gear j.
The shaft L is provided with a drum on which is wound the balancing cable Z which extends up through the shaft c and over one or more pulleys m suspended from an overhead support, the end of the cable being provided with a pendant counterweight n. The shaft L is provided also with a pair of oppositely facing ratchet wheels o, and co-acting with the respective ratchet wheels is a pair of oppositely facing pawls p connected by a bow-spring g, this pawl arrangement being a well known device adapted to simultaneously and alternately throw the pawls into and out of action, so that one of the pawls may be adjusted to lock the drum 7c against rotation through the pull by the balancing cable while the other pawl may be adjusted to lock the drum 7c against turning through the action of the load pulling on the load cable and transmitting the power through the gear wheels. In the drawing, the load sustaining pawl is in action While the other pawl is out of action, so that the apparatus is in position for raising the load and the weight fn is brought into counter-balancing action with relation to the load during the act of raising the load, the balancing cable being paid oif the drum /c as the load is raised. lVhen it is desired to lower the load the pawls are shifted and the opposite pawl then engages the other ratchet wheel, as shown in dotted lines in Fig. l; the load can then be lowered by rotating the shaft 7c in the direction to wind up the balancing cable Z, as is obvious.
I-Iaving thus described my invention, what I claim as new and desire to secure by Letters Patent, is
A crane consisting of an upright mast rotatably supported, the supporting means at the upper end consisting of a hollow shaft, a jib attached to said mast, a load drum and load cable supported on the mast and the jib, a load counter-balancing drum mounted on said mast, gearing connecting said two drums and means for rotating the drums in either direction, and a cable mounted on said load balancing drum and extending up through said hollow shaft and having a weight attached to its depending end, and suitable pawl and ratchet means for said drums.
In testimony whereof I hereunto aflix my signature in theV presence of two witnesses.
GEORGE B. GARST.
Vtitnesses:
R. H. MCCLAUGHERTY, IV. L. MCGHEE.
copies of this patent may be obtained for ve cents each, by addressing the Gommissioner of Patents,
Washington, D. C.
US71289112A 1912-08-02 1912-08-02 Balanced safety-crane. Expired - Lifetime US1048520A (en)

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US71289112A US1048520A (en) 1912-08-02 1912-08-02 Balanced safety-crane.

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US71289112A US1048520A (en) 1912-08-02 1912-08-02 Balanced safety-crane.

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