US700064A

US700064A - Steam-engine.

Info

Publication number: US700064A
Application number: US9319102A
Authority: US
Inventors: Andrew J Markham
Original assignee: Individual
Current assignee: Individual
Priority date: 1902-02-08
Filing date: 1902-02-08
Publication date: 1902-05-13
Anticipated expiration: 1919-05-13

Description

` Patentedmayla, |002.

A. J. MARKHAM.A

STEAM ENGINE.

(Application led Feb. 8, 1 902.)

(N0 Model.)

UNITED STATES PATENT OFFICE.

ANDREW J. MARKHAM, OE ELBA, NEBRASKA, ASSIGNOR OF ONE-HALF n'IO JOHN MORROV, OF ELBA, NEBRASKA.

STEAM-ENGINE;

SPECIFICATION forming part of Letterslatent o. 700,064, dated May 13, 1902.

Application led February 8, 1902. Serial No. 93,191. (No model.)

T LZZ whom t may concern;

Be itknown that I, ANDREW J. MARKHAM, a citizen of the United States, residing at Elba, in the county of Howard and State of Nebraska,haveinvented anew and useful Steam- Engine, of Which'the followingis a specification.

My invention relates to certain improvements in steam-engines, and has for its principal object to provide the cylinder with valves and valve-operating mechanism so arranged as to effect the simultaneous opening and closing of the steam inlet and exhaust valves at opposite sides of the cylinder' at the end of the stroke of the pistoni A further object of the invention is to provide for the adjustment of the parts to enable the valves to be opened or closed at any desired point near the end of the stroke, as fully set forth hereinafter.

With these and other objects in view the invention consists in the novel construction and combination of parts hereinafter described,illustrated in the accompanying drawings, and particularly pointed out in the appended claims.

In the drawings, Figure 1 is a sectional plan View lillustrating the cylinder, valve, and valve-operating mechanism of an engine made in accordance with my invention. Fig. 2 is a side elevation of the same.

In the cylinder 5 is a piston, which may be of any ordinary construction, said piston being connected by a piston-rod 7 to a connecting-rod 8, either to a crank-shaft orother point where the pressure of thefsteam 4is to be utilized or converted into motion. kOn opposite sides ofthe cylinder aresteam-chests 9 lO, respectively, the cylinder being connected to said steam-chests by inlet-ports 11 and exhaust-ports 12. Tothe steam-chest 9 is connected a supply-pipe 14, and to the steamchest is connected an exhaust-pipe 15, or the latter maybe in the form of a simple opening to exhaust the steam or otheruid directly to the` outer air.

In the steam-chest Q'isaslide-valve 16, hav.

Vthe cylinder.

either of the cylinder-ports 12 to permit the escapeof steam from either end of thelcylinder. The valve is connected toa Valvestem 22, extending out through a stuffingvlooX 23.

Theengine is provided with cross head guides 24; of any ordinary type and adapted for the reception of a suitable cross-head 25, to which are connected the piston-rod 7 and the connecting-rod 8. At a pointxnear the forward end of the cross-head guides is bolted a transverse bar 26, to which is centrally pivoted a locking-bar 27, having at its opposite ends pins or bolts 28, to which are connected the ends of the valve-rods 18 and 23. The Valve-rods'lS and 23 are preferably sectional, the adjacent ends of the sections being threaded for the reception of a nut 29, having right and left hand screw-threads f or engagement with the similar threads of the sectionsA of the valve-stem, so that .the position of the valve may be properly adjusted at any time'by increasing or decreasing the'distance between the center of its port and the pin or bolt 28.

To the cross-head'is secured a tappet-bar 30, which projects beyond the line of the crosshead and is disposed immediately above the valve-rod 18, said valve-rod for the greater portion of its length being substantially rectangular in form and provided with projecting lugs 3l for engagement bythe cross-head bar as the'latter is traveled to and fro by the movement of thepiston. The distance between. the lugs 3l with respect to the stroke of the piston is suchthat as the latter nears the limit of its stroke in either direction the tappet-bar will engage with one or other of the lugs, ,moving the Valve-rod 18 and the steam-valve to the opposite position for the admissionbf steam to the opposite ends of This movement is transmitted by the connecting-bar 27 totheValverod22 of the eXhaust-valvein reversefdirection, the operation beingsuch that'. as the steam-port leading from one end of the cylinder v'is open the above port leading to the opposite end of roc the cylinder will also be open, permitting the free escape of the steam from the exhaust side of the piston.

In order to provide for the adjustment of the valve movement with respect to the stroke of the piston, I preferably provide the lugs 3l with threaded openings for the reception ofvadjustable bolts 32, which may be moved either toward or from each other, as circumstances may require, to permit the movement of the valve at a desired point in the stroke of the piston. These bolts will also serve to prevent any Wear on thel lugs and may be adjusted from time to time in order to compensate for wear either on the tappet-bar or on the ends of the bars with which said tappetbar makes contact.

While the construction herein described, and illustrated in the accompanying drawings, is the preferred form of the device, it is obvious that various changes in the size, proportion, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of my invention.

Having thus described my invention, what I claim isl. The combination in a steam-engine, of the cylinder, valve-chests arranged on opposite sides of the same, there being ports or passages leading from the opposite ends of the cylinder to said valve-chests, slide-valves disposed within the chest, valve-rods connected to said valve and to each other, one of said valve-rods having a pair of lugs, and a tappet-bar actuated by the movement of the piston of the engine and adapted to make contact with said lugs.

2. The combination in an engine, of the cylinder, valve-chests arranged on opposite sides of the same, there being ports or passages leading between the valve-chests and the opposite ends of the cylinder, a piston in said cylinder, a piston-rod connected to the piston, a tappet-bar connected to and movable with the piston-rod, valve-rods connected to the valves, a pivoted lever to which both rods are connected, and one of said valverods being provided with lugs adapted to be engaged by the tappeti-bar, substantially as specified.

3. The combination in a steam-engine, of the cylinder, valve-chests arranged on opposite sides of the same, there being ports or passages leading between the Valve-chests and the opposite ends of the cylinder, a piston in said cylinder, a piston-rod 7 connected to the piston, a cross-head 25 connected to the piston-rod, cross-head guides 24 carrying said cross-heads, a tappet-bar 30 secured to the cross-head and projecting laterally therefrom, a transverse bar 26 connecting the cross-head guides,a bar 27 pivotally connected to said bar 26, an adjustable valve-rod 22 connecting the exhaust-valve to one end of the bar 27, an adjustable Valve-rod 18 connecting the steam-inlet valve to said bar 27, lugs 3l carried by said Valve-rod 18, and screw-bolts 32 carried by said lugs and adapted for contact with said tappet-bar 30, substantially as and for the purpose specified.

In testimony that I claim the foregoing as my own I have hereto axed my signature in the presence of two witnesses.

ANDREW- J. MARKHAM.

Witnesses:

PETER JEPsoN, JOHN MoRRoW.