US391960A - Half to horatio hobbs - Google Patents

Description

(No Model.) 2 sheets-sneetl.

E. P. GORDON. VALVE MEGHANISM.

Patented Oct. 30, 1888.

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E. F.. GORDON.

VALVE MBGHANISM.

No; 391,960. Patented Oct. 30, 1888.

@mitm/@osea l @mum/VCO@ j@ 5, 33W, ffm/WWW ihviTnn STnTns PATTNT Ottica EDXVARD E. GORDON, OF CONCORD, NEV HAMPSHIRE, ASSIGNOR OE ONE- HALF TO HORATIO HOBBS, OE SAME PLACE.

VALVE MECHANISM.

SPECIFICATION forming part of Letters Patent No. 391.960, dated October 30, 1888.

Application filed January 3, 1888. Serial No. 259.656. (No model.)

To all whom zit may concern:

Be it known that I, EDWARD F. GORDON, a citizen oi' the United States, residing at Concord, in the county of Merrimac and State of New Hampshire,have invented certain new and useful Improvements in Valve Mechanism, of which the following is a specification.

It is a well-known fact that an eccentric or crank gives an unvarying motion, and that irio regular cams which have been used to obtain irregular motion and which have heretofore heen applied to operate the valves of an engine, are defective from the fact that they are not positive, and can onlybe used on that class ot slowrunning engines where a spring is required to keep the reciprocating parts or valve mechanism in contact with the surface ofthe movable or rotative irregular cams.

The object of the present invention is to zo provide in a quick-running engine a valve mechanism which for simplicity of construction and variation ol" cut-off shallyield all the advantages and avoid the disadvantages of the valves and valve mechanism of the slower type of engine.

rlhe invention consists in providing a mechanism whereby a valve (adapted for covering the supply and exhaust ports) may be given a changeable motion which shall give in one 3e valve a variable cut-off withoutdiminishing the exhaust-aperture, which is fully described and pointed out in the following specification and claims, and clearly illustrated in the accompanying drawings, forming an inseparable part thereof, of which- Figure l represents a side elevation of a steanrcylinder provided with my improved valve mechanism. Fig. 2 is a sectional plan view in which one form ol" valve adapted to 4o serve my purpose is shown. Fig. 3 is an end elevation of the same. Fig. et is an enlarged end view of one of the valves. Eig. 5 is a erosssection of the steamcylinder, represent ing the part found at the right of the cutting 4,5 linex in Fig. 2, with a portion of the engine-bed and a sliding frame, which carries parts of the valve mechanism, shown in elevation and in its proper position relative tothe cylinder. Fig. (i is a broken plan view of an en- 5e gine to which my improvements are applied.

Similar letters indicate like parts.

A is a steam-cylinder, B its piston, and B the pistonrod.

valvechamber a and the chamber a2 with said valve-chamber and suitable exhaust-pipes, C. Hollow cylinder-valves D D are litted to said valvechambers a e, operating at right angles 6 5 with the steam-piston, and their stemstld pass through ordinary packing-boxes in the heads ai a, which close the valve-housings A?.

Then the valves are in the position shown in Eig. 2, it will be seen that live steam can pass 7o from the steam chest A through the passages or chambers e a to the steamcylinder A at one end, and exhaust at the opposite end through the chamber c and the hollow valve D into the chamber at, and thence into the ex- 7 5 haust-pipe G. The use of the ordinary eccentric or regular cams to operate these valves would fail to accomplish the purpose of my invention, and irregular cams for producing a variable cut-0E require independent valves for the exhaust; hence, in order to dispense with the independent exhaust and obtain equally as goed results, I provide valve mechanism, substantially such as represented in the drawings, consisting ot a lever, E, pivoted at each end to a valve-stem, d, or a short connecting bar, d, attached thereto, and Afulcrumed midway from either end at c to to a sliding frame, E, mounted on engine-bed, as shown, and adapted to move at right angles with the steamcylinder A. In the opposite end of the frame E is mounted a horizontal stud, G, upon which is mounted the hub h of an irregular disk cam, H. The lever E extends across the irregular face of said cam-disk, and is provided equidistant from each end with suitable socket-bearings, c', and adjusting-screws el for regulating their contact with irregular side of said camdisk. One or more nuts, may be threaded to the end of the hub 71', acting against the frame E, for the purpose of adj usting the canidisk relative to the lever E in order to insure perfect contact one with the other.

I For transmitting a positive motion from the main shaft to the disk cam H gearing may be employed, a portion of such gearing being rep- IOO resented in the drawings. 'Ihe bevel-gear J, which is mounted upon the hub Ii of the disk cam H, meshes with the bevel-gear K, mounted 011 a. vertical shaft, L, which is carried in a bearing, f, provided upon the frame F, and the said shaft L may be connected by suitable shafts and gears to the main shaft. The gearing or belt-connection may, however, be dispensed with entirely by a modification of the application of my improved mechanism, such as shown in Fig. 6-viz., by applying the disk cam II to the main or driving shaft of an engine. In the latter ease the lever E may be provided with a perpendicular extension projecting equidistant from either end, and to this extension E is pivoted one end ofa rod, M, the other end of said .rod being connected in like manner to a lever, N, which is similar in form to the lever E, having an arm, n, corresponding to the arm or extension F/ of said lever E. The ends n n operate the valve-stems d d, and the rod M serves to move the levers F N in unison.

Instead of varying the supply of steam to the cylinder by a governor in the usual manner, I connect the rod O with a governor in a manner to give said rod a reciprocal movement, one end being pivoted at o to a bellcrank, I), which in Figs. 3 and 5 is shown to be pivoted to a portion of the engine-bed Y andthe sliding-frame F, carrying the disk cam II and lever E. By this means the valves D are varied in their relation to the steamports automatically by means of the governor. The same can be accomplished with the disk cam H on the main shaft R, as shown in Fig. 6, by mounting a bell-crank, P', upon the engine-bed in a manner to support the lever N and connect with the rod O, by which means the lever N is automatically varied at its fulcrum-point and at right angles with the cylinder parallel with the piston-valves.

Having described my improvements, what-I claim as new is- 1. In a steam-engine, the combination of valve-actuating mechanism comprising an irregular disk cam and a lever pivoted and supported midway from either end'and adapted for continuous contact therewith at points diametrically opposite to each other.

2. The eombination,with anengine-cylinder and valve, of valve-actuating mechanism consisting of an irregular disk cam, and a lever pivoted and supported midway from either end extending across the irregular side of said disk and adapted for continuous contact therewith at points diametrically opposite to each other.

3. rlhe combination ofthe valves and valvestems, an irregular disk cam, and a lever supported midway from either end and adapted for continuous contact with said cam, having its fulcrum-point variable at right angles with the cylinder, whereby a variable cut-ofi` is obtained.

4. The combination, with the valves and valve-stems and a lever supported and fulerumed at a point midway from either end and adapted to transmit an alternate reciprocal motion to the said valves in a direction at right angles-with the cylinder, of a similarlever held in continuous contact with an irregular disk cam at points diametrically opposite and fulcrumed at a point within the radius of said cam, the said cam, and suitable connections between the cam-actuated lever and the said lever connected with the valve-rods, substantially for the purpose explained.

5. The combination of valves and valvestems with a lever supported and fulcrumed at a point midway vfrom either end and adapted to transmit an alternate reciprocal motion to the said valves, and means whereby said lever is automatically variable at its point of fulcrum relative to the steam-cylinder comprising an adjustable carrying-frame,to which said lever is fulerumed, and suitable connections with a governor, substantially for the purpose described.

6. In Valve mechanism, a disk cam having an angular irregular side, the said irregularities consisting of protuberances and depressions arranged diametrieally opposite to each other, a lever pivoted and supported at a point within the radius of said disk and midway from either end, having suitable adjustable bearings adapted for continuous contact (at points diametrically opposite) with said disk cam, and means whereby motion is transmitted from the driving-shaft to the valves, substantially for the purpose setforth.

7. In valve mechanism, a disk cam having an angular irregular side, a lever pivoted and supported at a point within the radius of said disk cam and midway from either end,having suitable adjustable bearings adapted for continuous contact (at points diametrically op'- posite) with said disk cam, the said support or fulerum-point of said lever being automatically variable to and from the steam cylinder, all adapted and arranged in a manner to transmit the desired motion from the drivingshaft to the valves, substantially for the purpose set forth.

8. In valve mechanism, means for automatically varying both terminal points of the stroke of the valves relative to the' steamports without changing the length of their stroke, comprising an irregular disk cam, a lever held in continuous contact therewith at points diametrically opposite, pivoted at each end to a valvestem, and fulcrumed midway from each within the radius of said disk cam to an adjustable frame, substantially for the purpose set forth.

In testimony whereof I at'iix my signature in presence of two witnesses.

. EDWARD F. GORDON. Witnesses:

J. B. Tunas-iron,

NATHL. E. MARTIN.

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