US89289A

US89289A - Improvement in steam-engine cut-offs

Info

Publication number: US89289A
Authority: US
Publication date: 1869-04-27
Anticipated expiration: 1886-04-27

Description

@that (time.

CHARLES CARR, OF BOSTON, MASSACHUSETTS.

Letters .Patent No. 89,289, dated A11/rtl 27, 1869; aatedatetl April 17, 1869.

IMPROVEMENT IN STEAM-ENGINE CUT-LFPS.

' -The Schedule referred to in these Lettera Patent and making part of the lame.

-the county of Suffolk, and State of Massachusetts,

have invented a new and useful Improvement in Self- Adjusting Out-Offs forfStea-m or Calorie-Engines; and

I do hereby declare the following is` a full, clear, and

exact description of theconstruction and operation of the same, reference being had to the drawings, making a part of thisvspecification, of which- Y Figure 1 is a transverse section of the cylinder and steam-chest on line C D, fig. 3.

Figure 2 is an elevation of the cylinder, showing the gearing and toggle-joint.

Figure 3 is a horizontal section on line'A B, iig. 1. Figure 4 is an elevation of the spindle, hollow shaft, cam, key, and gudgeon p, on which the ca is hung.

Figure 5 is an elevation f the cam an key, also section of the hollow shaft and spindle, the dotted lines a a showing the cams in different positions, as varied by the governor. Figure 6 is a sectional elevation of the disks and gearing, showing the governor-rod b, in connection with the ,toggle-joint c c, and reciprocating rod n.

Y Figure' is a sectional elevation, showing the direction of movement of thel cam, and its position at the time of opening the valve.

Like gures indicate the same or corresponding parts in all the figures or drawings.

lr is a rod, attached to the governor, the lower end of this being secured at the centre of the toggle-joint or arms c c and these arms being held at o, cause the rod n to reciprocate, thereby forcing the inclined key t' under, or withdrawing it from the cams h, caus.

ing the cams to rise'or fall, which, in so doing, raise the steam-valves more or less, without materially changing their lead, the lifting point always being opposite the gndgeons p, thus holding open the valves a longer or shorter period, as the resistance to the engine is increased or diminished.

The particular features of this cam are as follows:

Its driving-shaft passes through it, or it may partially'encircle the shaft, leaving sufficient space -bektween it and the shaft to allow it to project or recede by the reciprocation of the key fi.

It is also driven by this shaft, aud/is hung to said shaft at a point remote from its centre, or eccentric to its axis.

To use this cam singly, a hollow shaft is not required, as the key 'i may be vpassed between the cam h and its driving-shaft.

rlhe operation ofthe cams obviates-the necessity of a series of calns, as they are variable, raising the valves more or less, or for a longer or shorter period, at the same time not liberating the valves, but allows them to follow their surface in closing.

This invention may be used with marine as well as stationary engines, whether vertical or horizontal.

In working valves in the position shown, the arms ff, interposed between the valves r and stems g, and hanging at the centre, are to prevent the friction upon the valves in their vertical motion, which would occur were they to travel on the end of stem g, and also to cause them to properly seat themselves in closing.

I claim nothing new in relation to the valves or l their arrangement, they not being essen tial to the operation of the cams, as they may be given a horizontal or perpendicular motion.

Having thus described my invention, l

What I claim therein, and desire to secure by Letters Patent, is f 1. The cam h, substantially as shown and described, and for the purposes set forth.

2. Also, thel combination of the variable cam h, pivot, gudgeon p, hollow shaft m, rod n, stem g, arms j, and valves lr, as herein set forth.

3. Also, the inclined key t, in combination with the adjustable cams h., as herein described.

4. Also, in combination with the cam h, the inclined key i, the hollow shaft m, the rod n, and toggle-joint c e, for the ypurpose of actuating the cams h from the governor-rod b, as described.

5. Also, the arrangement of the arms f f, sliding valve av, and stem g, as described. l

CHARLES GARR.

Witnesses:

lZ. E. Comun,

THOMAS GAusr.