US813305A - Supply and exhaust valve mechanism for motors. - Google Patents

Description

PATENTED FEB. 20, 1906.

W. H. JOHNSON.

SUPPLY AND EXHAUST VALVE MECHANISM FOR MOTORS.

APPLICATION FILED JULY 5,1902.

WILBER JOHNSON, OF CUMBERLAND, MARYLAND.

SUPPLY AND EXHAUST VALVE MECHANISM FOR MOTORS.

Specification of Letters Patent.

Patented Feb. 20, 1906.

Application filed July 5, 1902. Serial No. 114,436.

To all whom it may concern;

Be it known that I, WILBER H. JOHNSON, a citizen of the United States, residing at Cumberland, in the county of Allegany and State of Maryland, have invented new and useful Improvements in'Supply and Exhaust Valve Mechanism for Motors, of which the following is a specification.

This invention relates to supply and exhaust valve mechanism for motors to which a fluid-impelling medium is supplied, the object of the invention being to provide valve mechanism which is simple of construction, comparatively inexpensive of production, and reliable and eflicient in action.

With this and other objects in view the invention consists of the features of construction, combination, and arrangement of parts hereinafter fully described and claimed, reference being had to the accompanying drawings, in which I v Figure 1 is a perspective view of a twincylinder engine or motor embodying my invention. Fig. 2 is a side elevation, partially in section, of one of the cylinders, showing the exhaust mechanism therefor. Fig. 3 is a transverse vertical section on the line 3 3 of Fi 2.

S imilar characters of reference are employed to indicate corresponding parts in the several views.

In the present instance I have shown the application of the invention to a twin-cylinder single-acting motor, the pistons of which may work in the same or opposite direction in unison, as desired, and have their connecting-rods attached to cranks on a crankshaft, (not shown,) so that one will be in working position when the other is on center; but it is obvious that the invention may be employed upon a single-cylinder motor without variation from the construction herein shown and by slight changes or duplications of parts may be used in connection with double-acting engines.

Referring now more particularly to the drawings, A denotes a motor of the horizontal type having twin cylinders 17 17, each of which will be provided with my improved supply and exhaust valve mechanism, although I have shown in Fig. 1 the complete mechanism for only one of said cylinders, this showing being sufficient to clearly illustrate the invention. From a suitable source of supply of an impelling medium leads a supply-pipe 13, which is connected to a cutoff valve 15 of suitable form supported by an angular pipe-section 16, made up of a series of pipe lengths connected by elbows and communicating with the under portion of the forward end of the cylinder. As shown in Fig. 1, the cylinders 17 17 are horizontally disposed in parallel relation and held elevated and above a base 18by end brackets or standards 19, which are suitably apertured to expose the opposite heads of the cylinders therethrough, and held by the said brackets or standards 19 are guide-flanges 20 with outer apertures 21, in which sliderods 22 are movably mounted. The forward ends of the slide-rods '22 are connected by inwardly-extending angular arms 23 to piston-rods 24, working in the cylinders and secured to pistons of any preferred form. The opposite ends of the slide-rods 22 have a pair of out standing spaced striker-pins 25. The flanges 20 also have upper centrally-disposed guideeyes 26, and therein link-rods 27 are slidingly mounted and have their forward. ends provided with stop-heads 28 and their rear ends bifurcated and connected to links 29. The rear ends of the links 29 are attached to and operated by throwlevers 30, fulcruined at intermediate points on the rear ends of rearwardly-extending supporting-bars 31, attached to the rear ends of the cylinders 17. The lower extremities of the levers 30 are outwardly deflected and terminally depend. over the outer portions of the slide-rods 22 between the pins 25, so as to be alternately engaged at opposite edges by the said pins to move the levers in opposite directions.

The cylinders 17 are each provided with exhaust means comprising an elbow 32, having one arm connected to the bottom portion of the forward end of the cylinder and the other arm attached to a pipe 32 as clearly shown by Figs. 2 and 3, the said elbow and pipe forming a part of the angular air-inlet pipe-section 16. The vertical arm of the elbow 32 has an opening 32 extending longitudinally therethrough and which is engaged by an exhaust-slide 32, having a rear tubular end 32 fully open at its rear terminal to the exterior of the cylinder and provided with a forward upper inlet-aperture 32*, adapted to aline with the vertical member of the elbow 32 and establish communication between the elbow and the exterior of the cylinder. The diameter of the exhaust-slide 32 is less than the diameter of the bore of the vertical member of the elbow 32,

so that when a solid portion of the-said exhaust-slide extends across the member of the elbow interference with the passage of the air into the cylinder when the valve 15 is open will be avoided, and when the outletopening 32 communicates with the vertical member of the elbow the valve 15 will have been closed. The exhaust-slide 32 moves in a plane parallel with the cylinder and has bearing in the opposite brackets or standards 19 and at the forward end is secured a verticallydisposed connecting arm 32 which extends upwardly and slidably engages the piston rod 24 in rear of the angular arm 23, connected to the sliderod 22. On the pistonrod 24 is an upstanding projection 32 which moves through the forward end of the cylinder when the piston arrives at a certain point within said cylinder slightly in advance of the terminal of its forward stroke. The said projection 32 strikes the upper end of the connecting-arm 32 and longitudinally shifts the exhaust-slide 32 to bring the opening 32 thereof into communication with the elbow 32, this communication with the ex terior of the cylinder through the medium of the rear tubular extremity of the exhaustslide being effected just at the time that the piston has arrived at the limit of its forward stroke. As before explained, the angular arm 23 moves with the piston-rod 24 and on the return stroke of the said rod and its piston the terminal of the angular arm 23, engaging the piston-rod, will strike the projected connecting-arm 32 and 'move the exhaust-slide 32 rearwardly just at the time that the piston has arrived at the rear ter minal of its stroke and at such time all the spent fluid will have been exhausted from the cylinder.

The valves 15 are automatically operated to open and close the same through the medium of levers 33, having their lower ends attached to the stems of the said valves and their upper ends formed with slots 34, one in each, and through the said slots pins 35, carried by the link-rods 27, extend to actuate the levers 33 and shift them in opposite directions in consonance with the reverse movement of said links-rods. The slots 34 are of such width and the pins 35 have an outward extent or length great enough to avoid a jam between the ends of the levers 33 and the pins 35 and also to impart to the levers a suffi- .cient outward movement to close the valve when the pistons have arrived at a certain forward position within the cylinder and also to impart to the said levers a reverse movement sufficient to open the valves when the pistons have arrived at the limit of their return strokes to thereby alternately and practically cut off the supply of fluid in the cylinders and permit fluid to enter the cylinders at proper intervals. The throw-levers 30 are actuated by the pins 25 to open and close the valves 15 through the medium of the connection of said levers with the link-rods 27 and the loose engagement of the levers 33 with said rods, the opening and closing movements of the valves, as before set forth, being in timed relation to the strokes of the pistons.

From the foregoing description, taken in connection with the accompanying drawings, the construction and mode of operation of the invention will be understood without a further extended description.

Changes in the form, proportions, and minor details of construction may be made within the scope of the invention without departing from the spirit or sacrificing any of the advantages thereof.

Having thus described the invention, what is claimed as new is 1. In a motor, the combination of a motor, a piston operating therein, a fluid-supply pipe, a controlling-valve in said pipe, reciprocating means governed by the piston for periodically operating said valve, an exhaust-valve in the supply-pipe controlling the exhaust of spent fluid from the motor to the atmosphere, and means of which the first mentioned means form a part for operating the exhaustvalve alternately with the said controllingvalve.

2. In a motor, the combination of a motorcylinder, a piston operating therein, a supplypipe for an impelling fluid, a controllingvalve in said pipe, an exhaust-valve in the pipe operated alternately with thecontrol ling-valve to control the supply and exhaust of the impelling medium, a reciprocating'rod operatively connected with the controllingvalve, a second rod connected with the piston-rod and operating said reciprocating rod to periodically open and close said controlling-valve, and means governed by the piston for controlling the exhaust-valve, substantially as described. 7

3. In a motor, the combination of a motorcylinder, a piston operating therein, a supply and exhaust pipe, a controlling-valve in said pipe governing the supply of the impelling medium to the cylinder, an exhaust-valve slidably mounted in the pipe, an arm or contact device on the piston-rod, means operated by said arm or contact device to actuate the controlling-valve, an arm connected to the stem of the exhaust-valve and slidably connected to the piston-rod, said arm being engaged by the first-named arm or contact device upon the return stroke of the piston to close the exhaust-valve, and a second contact device on the piston-rod adapted upon the outstroke of the piston'to engage said sliding arm and open the exhaust-valve, substantially as described. j

4. In a motor, the combination with a motor-cylinder, and a piston operating therein, a valve controlling the inlet of a fluid-impel- IIO ling agent to the cylinder, a reciprocating rod operated by the piston, a second reciproeating rod, a link connecting said second reciprocating rod with the valve, and control ling connections periodically operating under the action of the first-named reciprocating rod to successively transfer motion to the other reciprocating rod to actuate said link to open and close the valve.

5. In a motor, the combination with a motor-cylinder and a piston operating therein, of a fluid-supply valve, a reciprocating rod operatively connected to the piston, said rod being provided with spaced tappet devices, a second reciprocating rod, a link connecting said second reciprocating rod with the valve, and a throw-lever pivotally connected with the second reciprocating rod and adapted to be engaged by said tappet devices to transfer motion to said rod and link to open and close the valve.

6. In a motor, the combination with a motor-cylinder and a piston operating therein, of a supply and exhaust pipe, a rotary supplyvalve in said pipe, a sliding exhaust-valve in the pipe, a reciprocating rod, an arm rigidly connecting one end of said rod with the piston-rod, the opposite end of said rod being provided with spaced striker-pins, an arm rigidly connected to the stem of the exhaustvalve and slidably connected with the pistonrod and adapted to be engaged by the arm of the reciprocating rod on the return stroke of the piston to close the valve, a projection on the piston-rod adapted to engage said sliding arm upon the outstroke of the piston to open the exhaust-valve, asecond reciprocating rod, a link connecting said second reciprocating rod with the rotary supply-valve, and a pivoted throw-lever connected with the first reciprocating rod and adapted to be engaged by said spaced striker-pins on the second reciprocating rodto open and close the supplyvalve alternately with the exhaust-valve on opposite strokes of the piston, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WILBER H. JOHNSON. Witnesses:

WM. A. INGMAN, Jr. DAVID W. BEALL.

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