US99667A - Improved turn-table - Google Patents

Description

CLEMMENTS A.. GREENLEA'ROF INDANAPOLS, INDIANA Letters Patent N 99,667,fdated .February 8, 1870.

IMPROVED TURN-TABLE.

The Schedule referred to in these Letters Patent and ymaking part of the same.

I, CLEMMENTS ALGREENLEAF, of Indianapolis,in the county of Marion, and State of Indiana, have invented certain new and useful Improvements in the Construction of Turn-' lables for Railroads, Bridges., 85o., of which the following is a specication.

My inventiourelates tothe direct combination of the ends of the centrally-divided truss-beams in a i turn-table with each other, as well as with a central supporting-box, in such manner, that when united, each beam shall be continuous, independently of the box, and be also more irml y secured thereto and snspended thereby, than in the turn-tables now in use, the object of my invention being to relieve the central box, upon which the table is balanced, from the strain cfthe load, causing it to be borne wholly by the trussbeams, and to guard also against accidental displacement of the connections of said beams by any sudden' Figure 3, an` enlarged vertical section, taken longitudinally in a line drawn centrally through the supporting-box, as indicated by dotted lines :c x, in tig. l.

Figure 4, an enlarged section taken centrally in a line indicated at y y, through the length of the supporting-box, the pivot-pintle and its socket-plates, and one of the truss-beams, being removed therefrom.

In the accompanying drawings- A A are the two truss-beams of' a turn-table. Each beam is cast in two divisions of equal length and similar configuration, so formed as that when brought together and secured end to end, the under side of the continuous beam thus obtained will present an arc, of which the upper hat side will form a chord, as illustrated in fig. 2 of the drawings.

Each division consists of a thin plate of metal, tapering from the inner wide end bito the outernarrow end c (fig. 2) thereof, with holes cl fl left in its sides to -reduce its weight, and having a flange or rim, e c', projecting on each side, all around its edge, excepting at its inner end b.

The inner wide ends b b of the two divisions of' each beam are properly faced, to it very closely and exactly against each other, when their upper edges are so brought together, in a right line and in the same horizontal plane, as to form a continuous truss-beam,

A, as illustrated in figs. 1 and 2.-

".ihe two-divisions are connected and secured on top by means ot' wide-headed tie-straps f f, extending across the joint, and let into the upper edges of the beams, as shown in fig. l. l

Keys or wedges 'it' are driven in between one ofthe heads of each strap and the counterpart shoulder of the recess, into which it is sunken, as illustrated in l, 2, and 3, so as to draw and tightenthe joint of the` beam as closely and securely as possible. The divisions of the beam are also tied at the lower extremity of their joint by means of a cross tie-bar. whose ends are inserted into recesses pierced horizontally in each face of the joint, and which are caught and held therein by means of keys or wedges m m, insert-ed at right angles thereto, through transverse apertures in ,the beam, in register with like apertures in the ends ofthe tie-bar, so `that the wedges, when properly driven, shall draw together the faces' of the joint, and close the same firmly and securely. l

The two truss-beams A. A, thus constructed, are bolted centrally against or upon the ends of a hollow rectangular box, K, which is cast in one piece, 'with an enlarged aperture in the bottom thereof, to fit over and receive the pintle upon which the table is pivoted.

lhe ends of this central box K fit in snugly and accurately under the inwardly-projectin g ian ges e in the top edges of the beams, so that these flanges, overi lapping and embracing the ends of the box, form ahearing or support for the beams thereon.

Projecting strips s s, iig. 3, are also cast upon the inner face of each division of the beams, parallel to their inner ends, to bear against the sides of the box.

g They thus bear and tit closely against the side of the box, upon one side of the joint in each beam, but upon the other side are removed sufficientlyy to admit of the.

insertion of two wedge-shaped keys, 1t R, between them and the box, as illustrated in 2 and 3. lhese wedge-shaped keys It R are inserted, one above the other, from the inner side, and their smaller ends project outwardlythrough aperturesin the hean1,and are threaded to receive nuts, by means whereofl they are drawn up and tightened, or else loosened, at pleasure. They serve not only to clamp and tighten the beams laterally upon the ends oi' tbc central box K, but, being placed one above the other, on one side only of the box, may be used to level and adj ust, with nicety, thev npper surface of each beam, with reference to theaxis of the pintle, and the surface of the cap-plate in the central box, resting thereon.

The upper flanges c c' of the beams resting upon the upper outer edges of the box K, in combination with lthe side strips s s and wedges R R, embracing and clamping its side edges at eachend thereof', afford such -a bearing and support for the beams, independentof the bolts by which they are secured against the box,

. groove formed between the faces of as to measurably relieve the latter from the strain of the loadthereon, and afford great security against damage from any sudden j ars or strains.

The turn-table issuspended and pivoted, as usual,

'upon a conical pintle,l B, projecting from a suitable solid base or pedestal, C.

This pintle projects up within the central box K oi' the table, and bears against a cap-plate, D, bolted on the top thereof, to cover a cent-ral opening therein.

A friction-box, consisting of two circular plates, (the one secured to the under side of the cap-platefD and the other to the upper side ot' a socket-plate, E, as shown in fig. 3,) which are separated by aseries of intei-posed steel conical rollers running in a concentric said plates, facilitates the revolution of the table. The upper end of lthe pintle l5 is rounded, as usual, so that. the table may tip or vibrate thereon, as well as turn freely upon the rollers in the i'iction-bax.

(I he outer ends of the two beams A A- are connected' in t-he usual manner, -by cross-bars F F, provided with rollers, so arranged as to swing over a concentric track,

and yet not touch the same except when the table is tipped out of its horizontal plane. The Aends of the beams project through apertures in the cross-bars F F, as illustrated in Iigs. l and 2, and these are then box, pivoted upon a pintle, substantiallyv as herein described, is interposed between the beams, to form a continuation thereof from end to end ot the table, but my invention relates wholly to the improvement ob-. tained in theconstruction of turn-tables of this description, by uniting the ends of the two divisions o f each beam, one to the other direct, instead of to a box interposed between them, and in so' combining the ends ofthe central box with the centre of the continlions'beams thus obtained, as that they shall cover and overlap the -joints between the divisions of said beams, as hereindscribed.

I claim as my invention, in the construction of turntables- 1. Centrally-divided truss-beams A A, in combination with a central supporting-box B, when the two ends of each beam are brought together to form a continuous truss, independent of and exterior to said box, substantially in the manner and for the purpose herein set forth.

2. Projecting vstrips or lugs s s and flanges e' e', formed upon eachdivision oi' a divided truss-beam, A, and combined with a central box, K, sustaining said beams, when said strips and flanges embrace, 0r partially embrace and overlap the edges or corners of said box, substantially as herein set forth.

The foregoing specification signed this 30th day of December, 1869.

' GLEMMENTS' A. GREENLEAF.

Witnesses:

J. L. Mo'rnnnsnnan, ALEX. Rame.

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