US376972A - Peters - Google Patents

Description

(No Model.

M. J. L. TOWLBR. CONSTRUCTION OF DRAW BRIDGES.

Patented Jan, 24

UNITED STATES MAXIMILIAN J. L. TOWLER, or DETROIT,. MIOHIGAN.

CONSTRUCTION-OF DRAW-BRIDGES...

SPBCIFICATION'forming part of Letters Patent No. 376,972, dated January, 24, 1888. i,

Application filed October 25, 1887. Serial No. 253,344. (No model.)

. To all whom it'may concern:

of Fig. 1.

In the manufacture of d rawbridges the draw is swung upon a central drum, to the lower surface of which is fastened a tra'ck,and this track rests upon rollers, which are supported by a track carried by a bed plate resting upon masonwvork. As usually constructed, these tracks are made of solid pieces of ironin sections, planed to the proper bevel, and the.

upper track is secured to angle-irous on the lower part of the drum by tap-bolts, a construction in Which it is very difficult to make the parts fitaccurately and closely together.

My invention relatcs'to animproveineut in r of narrow strips of varying widths laid to I the tracks, and in the connection ofthe drum with the upper track, and is described as follows: Q

A represents a bedplate made in sections and secured tomason-work by the anchor-- bolts F. Upon this bedplate A, Ilay thelowerv track,which is" composed of a number of strips of iron, B, bent to the proper f0IlIl,Of varying widths togive theproper bevel to'the track,

as shown in Fig. 1, and these strips B are laid so as to break joints, asshown in Fig. 2,whereby a continuous smooth track is afforded,

which is not the case with the old form of connaled on the radial bar H, and M represents the.

usual roller-band,which spaces the rollers G.

K represents-the web-plateof the drum, to the top of which is riveted the angle-irons L 1 L, and the drum supports the -bridge in any desiredmanner.

i The upper track is made up of ironstrips B; secured together by bolts 0, laid to break 5 5 joints, and of different widthsto givethetrack;

the "proper bevel, precisely as before do: 1

scribed, from the lower track. Instead of b eing bolted'to angle-irons D, fastened to the lower end of the web-plate K, Icarry the webo0 plate K down through the upper track, as shown in Fig. l, and secure the track to the web bythe bolts G.

I I represent angle-brackets riveted to web plate K. and bearing uponthe upper surface 6 of the strips B, whereby accurate. fitting of the parts is made easy, and the surface oftlie, upper track is at all'points in position'to prop.- erly' bear on roller G. By this construction I obviate the jar caused by 'thejoints inthe7o track' in the old form of construction, and render it easy to attach the upper track to the web. so that it-will bear true upon the roller. J

What I claim as my invention, and desire to secure by Letters Patent, is-

1. A truck for'draw-bridge turn-tables, made break joints and bolted together, substantially as shown and described.

2. A track for a draW-bridgeturn-table,con- 8o sisting'of strips B, bolted together by bolts-O and secured to the bed-plate by angle-irons D} I substantially as shown and described. r

3. In combination with the web of a drawbraw bridge turn-table, a'track consisting *of a series of, narrow strips of iron of fvarying widths secured to the web by bolts,which pass through saidstrips and through'said web, substantially as shown and described.

4. In combination with the web-plate K, the no strips B','bolts G, and angle-brackets I, substantially as shown and described.

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