US100592A - Improvement in redttcing-g-ear for steam-engine indicators - Google Patents

Description

itd States HENRY L. RRnvOORr, or BROOKLYN, NEW YORK.

Leners Patent No. 100,592, dated Mmh s, 1870.

IIIMPRV'EIMIEN'I.` IN `REDUCING--G-IEEAR FOR STEAM-NG-INE INDICATORS.

. The Schedule referred to in these Letters ?a.tent and making part of the same.

To all whom. t may concern Be it known that-I, HENRY L. BRnvooRr, of Brook lyn, in the county of Kings, and State of New York, have invented a new andimproved Reducing-Gear for Steam-Engine Indicators; and I do hereby declare that the following is a full, clear, and exact descrip'- tion, reference being had to the accompanying drawlng.

In the application of `the steamengine indicator, the want of someconveuieut and universally applicable means of transmitting motion from the pistou of the engine to the card-barrel ot' the indicator has been very much felt. It has been customary to rig up temporalily, to suit each particular case, a lever which, by means of connecting cords, would produce a suitably reduced movement of the card-barrel, and which, after it has been used, has been thrown aside.

This invention consists in a portable reducing-gear of novel construction, provided with pulleys, and which can be conveniently changed to suit engines ot' dierent'strokes of pistou.

To enable others skilled in the art to make and use my invent-ion, I will proceed to describe it, with reference to the accompanying drawings, in which- Figure l is a front view'ot' my improved reducing gear. g

Figure2 is a central section ot' the same, perpendicularto iig. `1.

Figure 3 is a back viewof the same with its back cover removed.

Similar letters of reference indicate corresponding parts in the severakgures.

A is a plate or open box, having arranged across and parallel with its face, and iirmly secured to it by screws a a or otherwise a bar, B. This plate oi' box and bar constitute the fra-min g or case ofthe apparatus.

C and D are two spindles fitted to turn freely in bearings in the plate A and bar B, the spindle C having firmly secured to it, between the said plate and` bar, a spur-gear, E, and the spindle D having firmly l secured to it, between the said plate and bar, a much smaller spur-gear or punou, F, gearing with E.

Attachedto the rear end ofthe spindle C `is a spring, G, which is coiled up within and attached to the inside of a box, H, provided ou the back ofthe plate A.

This box is provided with a lid or cover, I, which is omitted in tig. 3, to expose the spring to view. The turning of the gear E in one direction produces such a tension on the spring G as will vcause it to turn back the said gear in the opposite direction, when the latter is liberated.

The spindles Gand D protrude smedistance through the bar B, and the parts so protruding are made of taper form or otherwise, so formed as to provide for the ready attachment to or detachment from them of `two flanged pulleys J' and K. Several suchv pulleys of different sizes are provided, which may be readily changed on each spindle at pleasure; and to facilitate vthe changing of thel pulleys and allow a greater number of' changes to `be made with a given'number of pulleys, the two spindles C and D should have those portions which receive the pulleys made of uniform size, that either pulley may be placed on either spindle.

To apply the reducing-gear to make this connection between the steam-engine piston and the card-barrel of the indicator, for the purpose of transmitting motion to the latter from the former, the plate A is attached to any convenient iixed support, permanent or temporary, by screws or otherwise, in such `position that a cord attached to and wound upon the pulley K may be attached to the pistou-rod of the engine, and that a cord wound upon the pulleyJ may be attached to the pulley on the card-barrel of the indicator. The movement of the engine piston then, by means of the cord attached to and wound on the pulley7 K, turns the said pulley and its spindle D and pinion F, and the said pinion communicates rotary motion to the gear E and its spindle O and pulley J, and the cord attached to the latter pulley turns the card-barrel of theiudicator.` i

In this operation the greater circumferenceV of the gear E, as compared with that of the pinion F, causes the movement of the cord connecting the pulley J with the pulley ou the card-barrel to be much reduced, as compared with the movement of the cord connecting the pulley K with the lpiston-rod, and hence, with a proper relation betweenV the sizes ofthe two pulleys J and K, a piston of long stroke will not produce more than asutiicient portion of a single revolution of the card cylinder to enable the card 7 to be obtained.

The relative circumferences of the pinion F and gear E, and the length ot stroke of the engine piston, and

circumference of the card-barrel. being known, it will' be a mattei' of easy calculation for the engineer to apply to the spindles G and D pulleysJ and K, of proper relative sizes t'o obtain from the piston of the engine a proper movement of the card-barrel to obtain cards of the requisite length.

What I claim as my invention, and desire to secure by Letters Patei1t,is-

A reducing gear for steam-.engine indicators, cousisting of a gear-,.E, and pinion, F, spindles C and D, and pulleys J and Kthe whole arranged and applied in a suitable framing or case, to operate substantially as herein described.

HENRY L. BREVOORT.

Witnesses:

FRED. HAYNES, HENRY PALMER.

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