US2037492A - Valve for pneumatic engines - Google Patents

Description

Ap 1935- A. w. ARNOLD.

.VALVE FOR PNEUMATIC ENGINES Filed Feb. 3, 1930 2 Sheets-Sheet l L x W d ffifi IN VEN-TOR.

A TTORNE Y.

A ril 14, 1936. A A L Y 2,037,492

VALVE FOR PNEUMATIC ENGINES Filed Feb. 3, 1930 2 Sheets-Sheet 2 1 N VEN TOR.

A TTORNE Y.

Patented Apr. 14, 1936 v UNITED STATES PATENT OFFICE 6 Claims.

This invention relates to a pneumatic engine and more especially to a combination of means to impart reciprocatory movement to a member, said member being. adapted to have secured thereto 5 any suitable work performing means.

An objectof my invention is to provide a pneumatic engine adapted to operate quickly and having means for. regulating the speed of operation of said pneumatic engine.

10 Another object of my invention is to provide a pneumatic device for imparting reciprocating movement to a work performing member. with means for securing any desired work performing means to said work performing member.

15 Another object of my invention is to provide a pneumatic device having means for controlling the same together with special features incorporated therein as will. more fully appear as the description proceeds.

Some of the objects of my invention having been stated other objects will appear as the description proceeds,.when taken in connection with the accompanying drawings, in which Figure 1 is a side elevation of my device with parts thereof broken: away;

Figure 2 is a view taken along the line 2-2 in Figure 1;

Figure 3 is a cross-sectional view taken along the line 33 in Figure 1;

30 Figure 4 is a view taken along the line 44 in Figure 2;

Figure 5 is a longitudinal cross-sectional view through the piston;

Figure 6 is a view taken from a point along the line 6-6 in Figure 2*;

Figure 7 is an exploded perspective view of the valve mechanism andassociated parts.

Referring more specifically to the drawings the numeral I indicates the base of my device which 40 has-the holes II- and I2 therein for securing the same to any suitable means of support, and projecting upwardly is a portion I3 which has on the upper end thereof and integral with the portion l3, a casing l4 in which my valve mechanism is 45 housed. Integral with the portion 14 and projecting from one sidethereof is a piston casing l5, though it is apparent that this casing 15 might be made separate if desired. This portion [4 has the transversely disposed bore therein in which 50 the valve member I6 is rotatably mounted, said valve member comprising the enlarged flange portion I1 and a projecting threaded portion 3 on the other end thereof, which portion i8 is adapted to have secured thereto nuts I 9 by means 55 of which the valve can be secured in the casing.

The portion 15 has a hole 20 therein which registerswith a chamber 2|, in which a piston 22 is mounted. This piston 22 has the. packing 23 secured thereon by means of a washer 24 held in place by screw 25. This piston 22 has a hollowed out portion 26 and in the base of this hollowed out portion 26 as at 21 is secured a rod 28 by being threadably secured into the piston 22 as at 21 with a collar 29 thereon to limit its inward movement. This rod 28 is threaded as at 30'. at its other end, and is adapted to have any suitable work. performing means secured thereto, the purpose of the. whole mechanism being to reciprocate. rod 28v back and forward at any desired speed.

The rod 28 has secured thereon a downwardly projecting arm 32 which has pivotally connected at its lower end by means of bolt 33, the. rod 34 which is connected by means of bolt 35 to an arm 36.- which projects downwardly from a disk 31. This" disk 31 has a hole 38 therein which is adapted to receive the pin [8 on the valve member l6, and this disk 31 also has the inwardly projecting pin 38:]. which is adapted to work in slot 39 of disk 40, said disk 40 having a hole 4.! therein, which is also adapted to work on the pin. l8. This disk 4i! has another arc-shaped slot 42 therein, in which a pin 43 which. is securely mounted in the valve member I6 is adapted to work. This pin 43 is adapted to cooperate with the entire mechanism as will be later described. This disk 40 has notches 45 and 46 therein with the tooth 4-1 rising up between said notches with sloping shoulders 48 and 49 with the flat portion 50 on top or at the end portion of said tooth.

The valve member l6 has a port 60 passing all the way therethrough in a direction transverse to the axis of the valve member and in a direction which is longitudinal with relation to the bore 2| of the cylinder 15. This port has at its outer end, grooves 6| which run on the surface of the member IS in a parallel relation to the projection l8 and circumferential grooves 62 and 63 communicating with the outer ends of grooves [it are provided for the purpose of distributing throughout the circumference of the valve the pressure of groove 6|.

The port hole 65 also is provided in the valve member which is in the same transverse plane of the valve member I6, said hole 65 penetrating from the exterior of the valve member l6 and running toward the center thereof, but stopping short of the center thereof and registering with a channel or hole 66 which is located in a parallel relation to the pin Hi, this hole 66 running to the exterior of the Valve on the end of the valve on which the enlarged flange l1 appears, and this hole 66 is enlarged as at 6'! into which a needle valve 98 is adapted to be mounted by means of threadably engaging the arm 69 and being adjusted in position by means of a nut 19, said arm 69 being secured by means of bolt H to the valve member I6.

The member 32 is adjustably secured along the rod 28 by means of a set screw 13, so that by adjusting the position of the member 32 the throw of the valve can be regulated.

Projecting upwardly from the top of the casing 95 is a projection 15 which has a bolt 79 therein, on which is pivotally mounted the member 1'! which has a hole '58 intermediate its ends through which a bolt 19 passes loosely, the lower end of said bolt being threadably secured in the projection 8! on the casing 85, and above the member Tl, and between a washer 82 on the upper end of the bolt is a compression spring 83 which is adapted to normally force the member 11 downwardly. On the free end of the member Ti there is provided the enlargement 85, which is pointed on its lower end, and is adapted to rest in one of the notches 45 or 46 as the case may be, and to assist in the operation of the Valve mechanism.

In the other side of the valve casing l4 opposite from the point at which the projection 15 emanates is a projection 95 which has the passageway 81 therethrough registering with the port hole in said valve mechanism, and this is threaded on its interior to receive any desired source of fluid supply.

The cylinder l5 has a cap 99 threadably secured on-the open end thereof which cap 99 has a plurality of holes 94 therein to allow air to pass readily therethrough in both directions, and the bushing 92 is secured in a central opening in said cap, in which bushing the rod 28 is slidably mounted, and around the rod 28 between bushing 92 and the closed end of the cylinder 22 there is mounted the compression spring 93, the purpose of said compression spring being to return the piston to the right in Figure 1 after it has been driven to the left by air passing into the chamber 21 The method of operation of my device is as follows:

With the parts in the position shown in Figure 1 air pressure is admitted through the passageway 81 through port 69 and hole 29, and into the chamber 2! which forces the piston 22 to the left hand in Figure 1 and this forces the rod 28 to the left hand, and along with it is carried the arm 32 which likewise carries the rod 34 and turns disk 31 mounted on pin l8 and the pin 38a on disk 31 is resting normally at the point e in slot '39 and pin 43 is normally resting at the point b in slot 42, and as the piston is moved to the left in Figure 1 the pin 38a rotates disk 40 in a clock wise direction, and this continues until the pin 43 in the valve l9 rests at the point a in slot 42, and as disk 31 is rotated pin 38a engages end c of slot 39 and at this time disk 48 is moved and the portion 85 of member 11 is raised upwardly by the sloping surface 49 and causes the other side of the sloping surface of member 85 to engage the sloping surface 48 of the projection 41 and the compression spring 83 forces member 1! downwardly which carries with it the projection 85, and this quickly forces the further turning of disk 49 and valve member IE to cause the port hole 29 to cease to register with the hole 60 running through the valve but causes the hole 20 to register with the port hole 65 which communicates with passageway 66 which allows escape of the fluid from chamber 2| through passageway 69 out past the needle valve 68 at the end of passageway 66, and the fluid escaping through this needle valve causes the compression spring 93 to return the parts to original position as is shown in Figure 1. The return of the parts to original position is accomplished by arm 32 and rod 34 moving to the right in Figure 1 along with piston 24, and rod 34 turns disk 31 in a counter-clockwise direction and this causes pin 38a to move into end d of slot 39 in disk 49 and turns disk 40 also in a counter-clockwise direction to cause projection 41 to ride beneath member 85 as member 85 is raised upwardly by surface 48 and then member 85 rides down surface 49 and moves disk 49 after movement of disk 37 ceases, and this further movement of disk 49 causes the parts to assume the position shown in Figure l, and at this point air pressure is again admitted to chamber 2| as above described. The length of stroke of piston 24 is that required to raise arm member 85 to a point where it is ready to travel down cam surface 48. This operation can be repeated very quickly, in fact can occur several hundred times within a minute, and one operation as above described fully sets forth the method of operation which is repeated. By adjusting needle valve 98 the rate of flow of the escaping fluid is governed and thereby the rate of speed of the device is regulated.

In the drawings and specification I have set forth a preferred embodiment of my invention, and although specific terms are employed they are used in a generic and descriptive sense only, and not for purposes of limitation, the scope of the invention being set forth in the appended claims:

I claim:

1. Valve mechanism comprising a valve casing having a cylinder therein with aligned openings in opposite sides thereof, a solid valve rotatably mounted in said cylinder, said valve having a straight cylindrical bore extending transversely through the axis thereof and communicating with the periphery of the valve only at the opposite ends of said bore, said bore being arranged to communicate with the cylinder openings, said valve having a radial bore therein extending throughout its length toward the transverse bore and disposed wholly in a transverse plane extending through the transverse bore, said valve having a longitudinal bore disposed eccentrically thereof and extending in a straight line from the inner end of the radial bore to an end of the valve.

2. Valve mechanism comprising avalve casing having a cylinder therein with aligned openings in opposite sides thereof, a solid valve rotatably mounted in said cylinder, said valve having a straight cylindrical bore extending transversely through the axis thereof and communicating with the periphery of the valve only at the opposite ends of said bore, said bore being arranged to communicate with the cylinder openings, said valve having a radial bore therein extending throughout its length toward the transverse bore and disposed wholly in a transverse plane extending through the transverse bore, said valve having a longitudinal bore disposed eccentrically thereof and extending in a straight line from the inner end of the radial bore to an end of the valve, and means carried by the last-mentioned end of the valve for regulating the opening through said longitudinal bore.

3. Valve mechanism comprising a valve having a longitudinal bore therein extending to an end of the valve, an arm secured to said end of the valve, and a needle valve having screw-threaded connection with and carried by said arm and extending lengthwise relative to an end of the longitudinal bore for regulating said bore.

4. Valve mechanism comprising a valve having a longitudinal bore extending to an end of said valve, an arm carried by said end of the valve and extending in overlapping and spaced relation with the end of the longitudinal bore, and a needle valve threaded through said arm and into an end of the longitudinal bore for regulating said bore.

5. Valve mechanism comprising a valve oasing having openings in different sides thereof, a valve rotatably mounted in the casing and having a transverse bore therein in position to register with and connect said openings, said valve having a radial bore in position to register with at least one of said openings, and having a longitudinal bore extending from said radial bore to an end of the valve, said last-mentioned end of the valve and of the longitudinal bore projecting outside of and being uncovered by the casing, an arm secured to said end of the valve, and a valve having screw-threaded connection with and carried by said arm and extending into position for regulating the longitudinal bore.

6. Valve mechanism comprising a casing, a valve rotatably mounted therein, said valve having a transverse bore therein, and having a longitudinally extending groove in the periphery thereof communicating with said transverse bore, and said valve having one or more circumferential grooves in the periphery thereof communicating with said longitudinally extending groove for distributing the pressure of said longitudinal groove about the periphery of the valve.

ALBERT W. ARNOLD.

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