US255026A - Guard-gate for swing-bridges - Google Patents

Description

(No Model.)

2-SheetsSheet 1'. F.ROEHR..

GUARD GATE FOR SWING BRIDGES.

- Patented-Mar. 14.1882.

(N0 Model.) 2 SheetsSheet 2.

F. ROEHR.

GUARD GATE FORSWING BRIDGES.

Patented Mar. 14,1882.

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GUARD-GATE FOR SWING-BRIDGES.

SPECIFICATION forming part of Letters Patent No. 255,026, dated March 14, 1882.

Application filed October 13, 1881. (No model.)

i eago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Guard-Gates for Swing-Bridges; and I do hereby declare the following to be a full, clear, and exact description of the inven tion, that will enable others skilled in the art to which it appertains to construct and operate the same, reference being bad to the accompanying drawings, and to letters of reference marked thereon, forming apart of this specification,

This invention is an improvement on Letters Patent No. 225,535 of March 16, 1880.

This invention relates to an improvement in safety or guard gates to be placed on the approaches of draw or pivot bridges for the purpose of closing the passage-ways andguarding against accidents during the time that the draw is open. The operating mechanism is so constructed and arranged that the gates are auto matically opened and closed by the movement of the bridge and operates with equal facility whether the bridge is swung in one direction or the other.

Figurelis a transversesrction, looking from the central pier sup tiorting the bridge. Fig. 2 shows the position of the guard-gates when closing the passage-ways, the bridge b'eing swung; Fig. 3, a vertical longitudinal section, and Fig. 4 a detached view of the angular levers'operatin g the side gates.

Referring to the drawings, A represents the vertical posts, and A the connecting crossbeam, which forms the main supportingframework for the gates.

A is the bridge-approach upon which the supporting framework is placed; A the bridge proper; B, the main central gate, and a the side gates or bars The hollow uprights or posts A are ordinarily constructed of heavy planking, and may be set on the bridge-approach at any convenient point, either close up to the edge or farther back on the approach. The main central gate, B, for closing the driveway has a vertical movementbetween the posts A, and is operated by means of the cords or chains D. One end of these cords is attached to the upper corners of the main gate, as shown by the dotted lines in Fig. 1 of the drawings, and passes upward and over the sheaves D, and from thence downward through the interior of the posts A, and under the sheaves D to the drum or pulley G, the lower end of one cord passing under and the other over the drum 0, as shown in Fig. l of the drawings. This arran gelnent throws an equal strain on each end of the gate, as the rotation of the drum 0 winds up or unwinds both cords at the same time. The principal portion of the operating meehanism is located beneath the bridge-approach, as shown inthe several figures ofthe drawings. The drum 0 is rotated on the shaft B, upon the outer end of which is placed the pinion d, which is adapted to engage with the gearwheel d, located upon the shaft (1 On the outer end of the shaft (1' is placed -the rockerarm G, upon the upper end of which is the friction-roller G which has a frictional contact with the beveled that 0 attached to the under side and near the immediate end of the bridge, as shown in Fig. 1 of the drawings. When the bridge is closed and the passageway open the lever or rocker-arm 0 will either incline to the right or left of avertical line, in accordance with the direction in which the bridge has been closed. When the bridge is being opened the lever'arm C will gradually assume a vertical position, and the main gate slowly descends by the force of gravity, and when the main gateis down and the lever-arm released from contact with the under side of the bridge the lever-arm rests in a vertical plane, as shown in Fig. 2 of the drawings.

The operation is very simple. As the bridge moves in one direction the drum 0 is rotated through the medium of the pinion (II, the gearwheel d, and the lever-arm O by reason of its bearing on the under side of the bridge. Whenthe bridge is moved the drum O rotates, and the cords attached to the main gate are wound up or unwound as the gate ascends or descends with the opening or closing of the bridge. The lower ends of the cords or chains D are usually secured to the exterior surface of the drum 0 by means of ordinary staples; or the ends of the cords may pass through the shell of the drum and be secured on the inside thereof in any suitable manner. The side gates or bars, a, for closing the foot passage way arerecessed into the parts A, and are pivoted thereto, as shown in Fig. 2 of the drawings. The inner ends of the bars a have the semicircular or enlarged part a the upper side being grooved out for the reception of the operating-cord a,

the upper end of this cord being attached to the bar a, and then running down and passing under the sheave a, and attached to the eye or lower end, I), of the angular lever a a detached view of which is given in Fig. 4 of the drawings. This angular lever has an operating-bearing in the staple or eye I), the upper end having a frictional contact with the under sideof a downward-projecting part of the cleat 0 When the bridge is closed the bars or side gates are raised to a vertical position in the posts A and the angular lever a assumes the position shown in Fig. '2 of the drawings. The

spring b placed in the recess and at the back side of the side gates, at, serves the purpose of 20 starting the side gates toward a horizontal position, and insuringa positive action at all times.

Having thus described my invention, what I claim, and desire to secure by Letters Pateat, is--- The combination, with the drum 0, the shaft B, the pinion d, the gear-wheel d, the gearwheel shaft (P, the lever-arm G, the frictionroller the beveled cleat C and the bridge A all constructed, arranged, and operating as 0 herein shown and described.

' FRANK ROEHR.

Witnesses SAMUEL A. GOULD, L. H. PAGE.

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