US2099406A - Valve loader - Google Patents

Description

E. K. LYNN VALVE LOADER Nov. 16, 1937.

mlll mmlml| h Filed Sept. 16, 1936 l4 l5 l6 I7 22 INVENTOR EWING K. LYN N ATTORNEY Patented Nov. 16, 1937 UNITED STATES PATENT OFFICE VALVE LOADER.

Application September 16, 1936, Serial No. 101,011

6 Claims.

This invention relates to a valve .device in which is provided a slide valve adapted to be reciprocated on a valve seat.

In certain types of valve devices, such as the brake valve device shown in U. S. Patent No.

1,980,334 to Ellis E. Hewitt, a slide valve is employed to control the supply and release of fluid under pressure to and from a fluid pressure operated device, such as the engines for opening and closing the vehicle doors. This slide valve is operated by a cam on the shaft of the brake valve.

The slide valve controls communication between ports in its seat, and as some of these ports are supplied with fluid under pressure, it is necessary to provide means to prevent the slide valve from being lifted from its seat by the fluid acting thereon.

It is desirable also to provide means to yieldingly press the slide valve against the cam on the shaft of the brake valve so that the slide valve willfollow the surface of the cam and move to the position determined thereby.

It is an object of this invention to provide means adapted to press a slide valve into engagement with its seat and which will also yieldingly urge the slide valve to move in one direction upon its seat.

A further object of the invention is to provide a valve device" having a slide valve movable upon a seat and controlling communication between ports in its seat, a cam for moving said slide valve in one direction upon said'seat, and common means for yieldingly pressing the slide valve against its seat and against the face of the said cam.

Another object of the invention is to provide an improved valve'device.

Other objects of the invention and features of novelty will be apparent from the following description taken in connection with the accompanying drawing, in which Fig. l is a view, largely in section, of a valve device embodying my invention,

Fig. 2 is a sectional view taken substantially along the line 2-2 of Fig} 1, and Fig. 3 is a sectional view taken substantially along the line 3-3 of Fig. 2.

Referring to the drawing, the valve device shown therein comprises a casing having a main section I, a bottom section 2, and a cover section 3, which when secured together form a chamber 5. The bottom section 2 is secured to the main section I by means of screws 6, one of which is shown, while the cover section 3 i 56- cured to the main section by means not shown.

The casing section I has secured thereto selflapping valvemechanism, not shown, which may be of the type shown in the above identified patent to Ellis E. Hewitt, and which is operated by 5 a shaft it which extends through an opening in the main casing section I, and has its lower end journaled in a bore in the bottom section 2. The shaft H! has an operating handle I2 secured thereon by means of which the shaft may be turned to different positions.

The bottom section 2 has a relatively thick portion I3 formed thereon in which is formed a channel having at the bottom'thereof a seat, indicated at M, in which are formed ports I5, I6 and IT. The port I5 is supplied with fluid under pressure from a suitable source, such as a supply reservoir, while the port I6 is connected to a door engine, and the port I1 is connected to the atmosphere.

A slide valve I8 is mounted in the'channel in the casing section 2 so as to be slidable on the seat I4, and this slide valve has a cavity 20 in the lower face thereof to establish communication between the ports in the seat I 4. The slide valve I8 is of such width as to substantially fill the channel in the casing section 2 so as to be guided by the walls of this channel.

One end of the slide valve I8 is reduced in size and projects beyond the thick portion I3 on the casing section 2 and engages one face of a cam follower 22, which has secured thereto guide pins 24 which are slidable in bores in the thick portion I3 of the casing section 2 on opposite sides of the channel in which the slide valve [8 is:

mounted.

The other face of the cam follower 22 is adapt ed to be engaged by a cam segment indicated at 26 formed integral with the shaft I0. A portion of the shaft I0 opposite the cam segment 26 is cut away, as is clearly shownin Figs. 1 and 2 of the drawing, and is of such width as to permit the cam follower 22 and the reduced end portion of the slide valve I8 to be moved into this cut away portion of the shaft.

The cover section 3 has a bore therein, indicated at 28, which is substantially in the plane of the channel in the casing section 2. The axis of the bore 28 extends at an angle to the slide valve seat I 4, and is arranged to intersect this slide valve seat intermediate the ends thereof. As is clearly shown in Fig. 1 of the drawing, the portion of the bore 28 farthest removed from the cam 26 is farther removed from the plane of the slide valve seat I4 than are the portions of the bore 28 adjacent the cam 26.

A stem 30 is provided and it has an enlarged head 32 having rounded faces thereon slidably positioned in the bore 28. The other end of the stem 3|] extends into a socket 33 in the upper face of the slide valve I8, and has a rounded surface which presses against a rounded concave face in a wear resisting insert 34 mounted in the socket 33 in the slide valve I8.

The end of the stem 38 is pressed into engagement with the insert 34 by means of a spring 36 which extends between the cover section 3 and a spring seat 38 secured on the stem 36.

The various parts of the apparatus are arranged and proportioned so that when the slide valve I8 is in the position which it assumes when follower 32, which is a position in which it is shown in Figs. 1 and 2 of the drawing, the socket 33 in the slide valve I8 is located at one side of the axis of the bore 28, while when the slide valve I8 is in the position which it assumes when the face of the cam segment 26 is out of engagement with the cam follower 22, the socket 33 will be located on the other side of the axis'of the bore 28.

In operation the spring 26 exerts force through the spring seat38 to press the end of the stem 30 against the wear resisting insert 34 in the slide valve I8, thereby exerting force'on the slide valve to press the slide valve against the seat I4 to prevent unseating of the slide valve by fluid under pressure supplied through the port I5, and at the same time the spring 36 exerts force on the slide valve I8 to move it to the right, as viewed in Figs. 1 and 2 of the drawing, and press against the face of the cam segment 26.

On movement of the operating lever I2 in a direction to move the shaft III in a clockwise direction, as viewed in'Fig. 2 of the drawing, the cam segment 26 is moved across the face of the cam follower 22, and after a certain amount of turning of the shaft ID, the cam segment 26 will be moved away from the cam follower 22 and will not maintain the slide valve I8 in the position in which it is shown. 7

On this amount of movement of the shaft III, the slide valve I8 is moved to the right by force exerted by the spring 36 through the stem 30,

, while the spring 36 expands somewhat.

than that in which it is shown in the drawing.

The stem 36 is free to change its position as the rounded head portion 32 permits it to move freely in the bore 28.

On subsequent movement of the operating handle I2v in a direction to turn the shaft III in a counterclockwise direction, as viewed in Fig. 2 of the drawing, and thereby return the cam segment 26 to the position in which it is shown in Fig.2

of the drawing, the cam segment 26 presses against the cam follower 22 and moves it to the left, as viewed in Fig. 2 of the drawing, and its movement is transmitted tothe slide valve I8 to move the slide valve on its seat I4. On this movement of the slide valve I8, the stem 30 is moved upwardly in the bore 28in the cover section 3, while the spring 36 is compressed slightly.

It will be seen that the spring 36 operates both to press the slide valve I8 against the seat I4, and to press the slide valve I3 against the face of the camsegment 26 carried by the shaft Ill.

The division of the force exerted'by the spring 36 on the slide valve I8 to press the slide valve against the seat I4, and to press the slide valve against the cam on the shaft I0 depends upon the angular position of the stem 30. The stem 30 is arranged so that the force exerted on the slide valve I8 to hold it seated is great enough in all positions of the slide valve to prevent the slide valve from being unseated by the fluid under N pressure acting thereon. The spring 36 also exthe face of the cam segment26 engagesthe cam" erts enough force on the slide valve I B tending to press it against'the cam on the shaft I0 to insure that the valve will move upon its seat when the cam .26 is moved away from the slide valve.

While one embodiment in the improved valve device provided by my invention has been illus trated and described in detail, it should be understood that. the invention is not limited to these details of construction, and that numerous changes and modifications may be made without departing from the scope of the following claims. j

' Having now (described my invention; what I claim as new and desire to secure by Letters Patent, is:

1. In a valve device, in combination, a body having a seat thereon having ports therein, a slide valve movable upon said seat to control communication through said ports, a cam associated with said slide valve for moving it in one direction on said seat, and a spring associated with said slide valve for yieldingly pressing said slide valve against said seat and for also pressing said slide Valve against said cam.

2. In a valve device, in combination, a body having a seat thereon having ports therein, a slide valve movable upon said seat to control communication through said ports, a cam associated with said slide valve for moving itin one direction on said seat, and a spring associated with said slide valve for yieldingly pressing said slide valve against said seat and for also yieldingly opposing movement of the slide valve by said cam.

3. In a valve device; a body having a seat thereon having ports therein, a slide Valve movable upon said seat to control communication through said ports, a cam for moving said'slide valve in one direction on said seat, a stem pivotally engaging said slide valve and extending away from said valve seat and away from the slide valve in said one direction, and a spring for pressing said stem against said slide valve whereby said slide valve is yieldingly pressed against said seat and is also yieldingly pressed against said cam. I

4. In a valve device, in combination, a body having a seat thereon having ports therein, a slide valve reciprocably movable on said seat in a given plane to control communication through said ports, said body having a bore therein in the plane of 'movement of the slide valve, said bore extending away from the valve seat in a plane at an angle from the vertical, a stem associated with the slide valve and having an enlarged rounded head slidable in said bore, a spring associated with said stem and pressing said stem Q against said slide valve, and a cam for moving said slide valve against said spring.

5. In a valve device, in combination, a body having a seat thereon having ports therein, a slide valve reciprocably movable on said seat in a given plane'to control communication through said ports, said body having a bore therein in the plane of movement of the slide valve, said bore extending away from the valve seat in a plane at an angle from the vertical, a stem associated with the slide valve and having an enlarged rounded head slidable in said bore, a spring associated with said stem and pressing said stem against said slide valve, and means for moving said slide valve against the said spring.

6. In a valve device, in combination, a body having a seat thereon having ports therein, a slide valve reciprocably movable on said seat in a given plane to control communication through said ports, said body having a bore therein, the axis of said bore being substantially in the plane of the valve seat and intersecting the valve seat intermediate the ends thereof, a slide valve hav- 7 ing a socket therein, a stem having an enlarged rounded end thereon slidably mounted in said bore, the other end of the stem extending into the socket in said slide valve, a spring associated with said stem and operating through said stem to yieldingly urge the slide valve to a position in which the socket therein is located on one side of the axis of said bore, and means for moving said slide valve against said spring to a position in which the socket in said slide valve is located on the other side of the axis of said bore.

EWING K. LYNN.

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