US499622A

US499622A - Girder for traveling cranes

Info

Publication number: US499622A
Authority: US
Publication date: 1893-06-13
Anticipated expiration: 1910-06-13

Description

(N'Model.)

i 6 Sheets-Sheet 1. H. WEIOKEL. GIRDBR FOR TRAVELING GRANES.

No. 499,622. PmentedJurie 13,1893.

6 Sheets-Sheet 2.

(No Model.) Y H. WEIGK-EL. GIRDBR POR TRAVELING GRANBS. No. 499,622. Patented June 13,1893.

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6 Sheets--Sheet 3.

(No Model.)

H. WEICKEL. GIBDER FOR TRAVELING GRANES. W

No. 499,622. Patented June 13, 1893.

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H. WEIGKEL.

GIRDER FOR TRAVELING GRANES.

190.499,622. Patented June 13, 1893.

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' 6b/iM 1u: Nonms PETERS oo. wo'muwo, wAsHmorm. n c4 (No Model.) 6 Sheets-Sheet 5.

H. WEICKBL. GIRDER FOR TRAVELING GRANES.

No. 499,622. Patented June 13, 1893.

(No Model.) 6 Sheets-Sheet 6.

H. WBICKBL. GIRDER FOR TRAVELING GRANES.

No. 499,622. Patented June 13,1893@ Tue-Nbnms Pneus cof, How-urna., nimm-mu, u. c.

' stiffness and strength in this way.

UNITED STATES PATENT OFFICE.

HENRY WEICKEL, OF DARIEN, ASSIGNOR TO THE YALE & TOWNE MANU- FACTURING COMPANY, OF STAMFORD, CONNECTICUT.

GIRDER FOR TRAVELING CRANES.

SPECIFICATION forming part of Letters Patent No. 499,622, dated June 13, 1893.

Application tiled April 30, 1892. Serial No. 431,273- (No model.)

To a/ZZ whom it may concern:

Be it known that I, HENRY WEICKEL, a citizen of the United States, residing at Darien, in the county of Fairfield and State of Connecticut, have invented a new and useful Improvement in the Construction of Gir-ders for Traveling Cranes,ot` which the following is a specification.

In the use of traveling cranes, the stress resulting from the load when the bridge is at rest is practically Vertical, so that for this situation it would only be necessary to design and build girders sufficiently strong to resist this Vertical strain. But when the load is suspended and the bridge is traveling on a horizontal track, it is apparent that when the movement begins a severe horizontal strain occurs in starting the load from a state of rest into motion. This strain exists so long as the bridge is in motion, but is most severe in starting 'and stopping and becomes more serious in proportion to the amount of the load, the speed and the length of the bridge, In the case of an ordinary girder, or with an I beam, this side strain is provided for in a measure by the top and bottom horizontal anges. In some cases, with plate girders the flanges are made wider. and stiffer by bolting or riveting either a flat iron or angle iron to the sides of the anges but for severe strains it is not practicable to provide sufficient horizontal Girders have also been stiffened by the use of supplemental lateral girders fastened to the top or bottom of the main girder, as the case may be, and braced against the opposite iange of the main girder by diagonals; but this construction induces a side thrust, and a consequent tendency to deflection of the flange of the girder against which these diagonals are braced and a resulting tendency to torsion and oscillation. It will be understood that the difficulty referred to is peculiar to traveling crane bridges for the reason that the main girders of such bridges require a clear space between them for working the trolley tackle and hence the lateral bracing trusses can be applied on the outer sides only of such bridge girders. These lateral and torsional strains and consequent oscillation are what it is particularly desired to obviate and avoid, in the case of traveling-crane-girders.

To this end my invention consists in attaching to the main girder, preferably in the planes of its upper and lower chords, one or more horizontal trusses of light but stiff construction, and supporting the outer chords of these horizontal trusses by an auxiliary girder, of which they may form the top and bottom chords, as hereinafter described, when two such horizontal trusses are employed. This auxiliary girder, which is preferably of latticed construction, but for short spans may be a beam such as a channel, or I-beam, may be supported at its ends either upon the truckframes at the two ends of the crane-bridge, or upon a stiff beam or arm bolted across the main girders of the bridge near each of its ends. The results of this construction are that any tendency in the upper and lower chords of the main girder to lateral or horizontal deflection is resisted by the horizontal trusses above mentioned., these trusses in turn being maintained in their proper positions, preferably in the two planes respectively of the upper and lower chords of the main girder, by being supported on one side by the main girder itself and on the other side by the auxiliary Vertical girder or truss already mentioned. Obviously the construction of the main girder in any of the usual forms which are symmetrical introduces no element of twisting or of bending except in the vertical plane. My invention accomplishes the stiffening ofthis girder horizontally to any desired extentwithout introducing any twist= ing or torsional strains.

While it is preferable for very long spans to apply lateral trusses to both the top and the bottom of the main girder and to support these by an auxiliary vertical girder as above stated, it is practicable, with comparatively short spans, to carry out my invention by the use of a single lateral truss, the outer chord of which is supported by an auxiliary girder or where more convenient a beam such as a channel-beam or I-beam may be substituted for a built up girder. This auxiliary girder or beam may be supported at its ends, either directly upon the truck frame or upon IOO l case, but serves only to support the outer chords of the horizontal truss or trusses, so that they may produce their desired eifect of stiening the main girder against lateral or horizontal deiiection without producing any twisting strain.

In order that my invention and the manner of carrying it into effect may be fully understood, it will now be described in detail, with reference to the accompanying drawings, in which- Figure I is a perspective view of a traveling crane illustrating my invention, resting on temporary supports and with the truck wheels removed. Fig. II is a perspective View of the same mounted in operating position on the elevated ways. Fig. III is a plan of one side of the structure showing a top view of one of the horizontal trusses. Fig. IV is a horizontal section showing a top View of the lower horizontal truss. Fig. V is a transverse section showing both the upper and lower horizontal trusses. Fig. VI is a front elevation of a bridge or girder of moderate span in which a single horizontal truss is employed, attached to the web of the main girder. The outer chord of this truss is formed of an auxiliary girder to aord vertical support, which in this illustration is in the form of a channel beam as shown in Fig. VIII. It will be noticed also that in this drawing the bridge is made from an I-beam. The particular construction of the bridge or of auxiliary girder is not material to my invention. Fig. VII is a plan view of one side of the saine. Fig. VIII is a transverse section thereof on the line VIII--VIIL I build a bridge for traveling cranes with main girders, 1, 1, constructed in any usual or suitable manner. For the purpose of illustration I have shown each of said girders constructed with a central web 2 to the upper edge of which are bolted horizontal angle bars 3, 3, surmounted by a plate 4 to receive the track rails 5 for the carryingwheels of the A. trolley. To the lower convex edge of the web 2 are bolted angle bars 6` and a horizontal plate7 and between the anges and the upper angle bars 3` and lower bars 6 vertical plates or flanges 8, 9 are secured, which give increased stiffness and transverse strength to the girder and afford means of attachment for my horizontal truss frames presently to be described. The main gil-

ders

1, 1, are as usual united at their ends by any necessary number of transverse horizontal beams 10, 11 constituting the frame in which the gearing for moving the bridge and operating the crane has its bearings and from which the operating cage 12 is suspended. The journals of the truck wheels 13 of the bridge have their bearings in brackets 14, 15, mounted upon the sides of the bridge-girders near their ends, in any usual or suitable manner. The trolley 16 and its accessories which travel on the transverse rails 5, the mechanism for operating the same, the operating mechanism within the cage 12 and other necessary parts not herein specifically described may be of usual construction.

To take up thesevere horizontal strain applied to the brid'ge-girders in moving the loaded crane upon the longitudinal ways 17, I attach to the side of each main girder l, a horizontal truss 18, suitably constructed to render it light and stiff and with traveling cranes of large span, in addition to the horizontal truss I8 applied to they side of the main girder at or near its top, I apply a second truss 19 at or near the bottom of the main girder, extending horizontally therefrom and curved on a line parallel with the convex lower edge of the ma-in girder. It is not essential, however, that the truss should be parallel with the edge of the girder, as in some cases I accomplish substantially the same results in a cheaper manner by making the lower truss straight. The outer chords 1S, 19, of the

trusses

18, 19, are connected by means of an auxiliary, vertical, latticed girder 2O for mutual support.

In practice the chords or outer longitudinal members 18a, 19a, of the upper and lower horizontal trusses, 18, 19, may constitute the upper and lower stringers or longitudinal members respectively of the auxiliary girder 20. For illustration I have shown the outer stringers 18a, 19, of the horizontal trusses thus connected by diagonal braces 20 for mutual support, so that they form the upper and lower stringers of the auxiliary girder. The auxiliary girder is supported at its ends upon any part of the truck frames or to the main girders near their ends so as to relieve the intermediate parts of the girders of any twisting therefrom.

The horizontal trusses 18, 19 which under my improved construction may be extended to any necessary width, afford eectual means for taking up the heavy transverse strains to which the bridge-girders of a traveling crane are subjected under motion, and rigid vertical support, being provided for the outer chords of the combined horizontal trusses, 18,19, the main girders are relieved from torsional or deflecting strains to which they are subjected with constructions in common use. I thereby greatly increase the strength and endurance of the structure and eliminate the principal cause of the oscillatory action which is a common experience in the operation of traveling cranes and which besides interfering seriously with the work is highly injurious to the structure itself.

For cranes of comparatively short span for example 20'feet or less I accomplish the de-l sired result by the use of only one truss, the

outer chord of which is supported by an auxil- IOO iary girderor beam, which latter is supported at its ends by the truck frames, or by a bracket or arm fastened near the ends of the main girder. traveling cranes of comparatively short span is illustrated in Figs. VI, VII and VIII. In this construction as in the other a horizontal truss 1S of any desirable width is fastened to the side of the main girder l and the outer chord 18a thereof is effectively supported by its ends without any vertical diagonal braces, or any connections with the main girder anges adapted to resist vertical strains and in so doing apply torsional strains to the main girder.

Having thus fully described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

l. A traveling crane bridge girder oonstructed with a horizontal bracing truss eX- tending laterally from the outer side of the main girder and having its outer chord supported vertically at or near the ends of the This application of my invention to main girder, whereby the central parts of the main girder are relieved of torsional strains, substantially as herein described.

2. In combination with a traveling crane bridge, a pair of horizontal trusses connected to the upper and lowerchords respectively of each main girder of the bridge and braced together so as to provide an outer auxiliary girder aiording support to said horizontal trusses, as explained.

3. A bridge for traveling cranes having lateral trusses projecting horizontally from the upper and lower chords respectively on the outer side of each main girder and diagonal braces uniting the outer chords of said lateral trusses whereby they are supported at points near the ends of the main girder and the intermediate parts thereof are relieved of torsional strains.

HENRY VEICKEL. Witnesses:

SCHUYLER MERRITT, GEO. E; WHITE.