US1133785A - Relief-valve for liquid-sprayers. - Google Patents

Description

L. A. ASPINWALL. L RELIEF VALVE PoR LIQUID SPRAYERS.

APPLICATION FILED AUG. 8, 1914.

1,133,785. Patented Mar.3 0,1915.

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LEWIS AUGUSTUS ASPINWALL, OF JACKSON, MICHIGAN, ASSIGNOR TO ASPIN WALL MANUFACTURING COMPANY, A CORPORATION OF MICHIGAN.

RELIEF-VALVE FOR LIQUID-SPRAYERS.

Specification of .Letters Patent.

Patented Mar. 30, 1915.

Continuation in part of application Serial N o. 788,556, led September 8, 1913. This application led August 8, 1914. Serial No. 855,759.

To all whom 'it may concern:

Be it known that I, Lnwrs AUGUSTUS As- PINWALL, a citizen of the United States, residing at Jackson, in the county of Jackson and State of Michigan, have invented an Improvement in Relief-Valves for Liquid- Sprayers, of which the followingis a specication.

My present invention relates to relief valves employed in connection with liquid sprayers for spraying plants and vines, such, for example, as tomato plants and potato vines, with a suitable liquid, for killing insects which would otherwise infest and tend to destroy such vegetation, the relief `or by-pass valve being employed in conjunction with a pump to care for the excess liquid not required at the nozzles of the sprayer. Heretofore this excess liquid has been taken care of in various ways. For instance, as shown in Letters Patent No. 1,018,804, granted to me February 27, 1912, for liquid sprayers, a pipe connection was employed between the pressure chamber and the suction end of the pump, by which the excess liquid not required at the nozzles was returned directly to the pump. I now prefer to employ for this purpose a loose iitting relief or by-pass valve located interiorly of the barrel or liquid receptacle and adjustable exteriorly thereof and so connected with the pressure chamber that the excess liquid not required at the nozzles is returned to the barrel or liquid receptacle, as will be hereinafter more particularly described.

In the drawing, Figure 1 is a central sectional side elevation illustrating my present invention. Fig. 2 is a central longitudinal front elevation of the same, and Fig. 3 is a sectional elevation illustrating the relationship between the relief valve, the'barrel, and the pump.

Referring to the drawing, 10 indicates a portion of a barrel or liquid receptacle, such as iscommonly employed in liquid sprayers to which this invention relates. As is also customary in these devices, the pressure chamber 11 is employed and connected with the discharge end 12 of a suitable pump,

from which also a pipe 13 leads to the nozzles by which the spraying is effected. Withln the barrel 10 I employ an elbow 14, made of cast iron or other suitable material, and one end 15 of this elbow is connected by a'pipe 16 to the pressure chamber 11, the pipeV 16, as illustrated in Fig. 3, passing through one end of the barrel 10.

The elbow 14 is suitably connected to a bracket 17 having a flange 18, by means of which, together with a bolt 19, the elbow is secured in position within the barrel. 20 indicates a cylinder, preferably made of metal, which is open-ended, provided at one end exterlorly with suitable screw threads to engage the screw thread in the opposite end 21 of the elbow 14. In the cylinder 20, adjacent the end at which it is connected to the elbow 14, are a plurality of ports 22 preferably arranged circumferentially of the cylinder. Within the cylinder 20 is a piston 23, connected to which is a piston rod 24. The piston 23 is preferably loosely mounted within the cylinder 20, there being approximately a thirty-second of an inch play between the periphery of the piston and the inner surface of the cylinder, so as to simplify the construction, reduce the cost of making and fitting these parts, and also to o bviate the possibility of the piston becoming corroded and rendered immovable in the cylinder during periods when the apparatus is not in use. Altogether, the work-V ing is with less power and friction by reason of the absence of packing.

Suitably secured on the rod 24 is a memb er having a series of radially disposed ribs 25 fitting within the cylinder and providing for intervening spaces through which the liquid may pass. Also connected to the lower or outer end of the rod 24 is a flange 26, provided at opposite sides with lugs 27 having suitable apertures in alinement therein to receive a bolt 28, which passes through the apertures in these lugs and also through apertures provided therefor adjacent the ends of the yoke 29. The lugs 27 are so spaced as to fit within the yoke 29, and these parts are secured in position by means of cotter pins 30, which pass through the bolt 28 eXteriorly of the members of the yoke or by other similar devices. The members of the yoke 29 span the cylinder 20 and also the elbow 14,

above which and in alinement with the cyl# inder, a rod 31V is suitably connected to the yoke. This rod 31 passes through an open-V ing provided therefor in the wall of the barrel 10, and extends an appreciable distance from the outer'surface of the barrel. i

32 designates a support base which, as illustrated, is secured to the outer surfaceof the barrel by means of a bolt 33, and extends preferably at an inclination from the barrel. y34 is a bracket which is connected to the support Vbase bybolts 35, or otherwise, and the free end of the bracket 34 preferably extends in a direction at right angles to andl approximately directly above the rod 31. Onthe support base 32, there are lugs 36. A' lever 37 is pivotally connected at one end to. these lugs 36, and the upper end of the vrod 31 is pivotally connected to the lever 37 by means of a bolt 38. I also employ a spring, preferably a helical spring 39, one end of which is connected With an eyey 40, in the free end of the lever 37, and

the other end of which is connected with.

an eye 41, in one end of an adjustingscrew 42, which passes through the bracket 34 and on the opposite side thereof is provided with a thumb nut 43.

',Asfwill be readily understood, the action of the spring 39 maintains the piston 23 in its normal position through the lever 37, the rod 31, the yoke 29, and the members connecting the same with the piston rod 24, andthat upon the accumulation of an excess pressure in the pressure chamber 11, the surplus liquid will pass from the discharge end of the pump, through the pipe 16, and the pressure will force the piston to move sufiiciently to open the ports 22 through which, as well as through the open free, end of the cylinder, this liquid may now pass and so be returned to the barrel. It will furthermore be apparent that the pressure at which the piston is operated may be regulated by adjusting the tension on the spring 39 through the adjusting screw 42.

and the thumb nut 43, it being understood that with a greater tension on the spring'39 more pressure will be required to operate the piston, and vice versa, and by this means the pressure at the nozzles may be regulated when the pump is substantially constant.

I claim as my invention:

1. In a relief valve and in combination, a support, a'headfixed in the said support and provided-with an inlet'and an outlet connection, `between which there is always affreepassage, a cylinder secured in andvv extending from the said outlet connection and provided adjacent thereto withI a series of discharge ports, aV piston fitting loosely within the cylinder and normally lying ad- -adjustably vconnecting the same to the said' Y support exteriorly of the cylinder for.. regu.-

latingthepressure at which 'the piston will operate to control the extent to which the said ports are opened by thesame.

In az reliefvalve and in combination, asupport, a'head fixed in the said support and provided with an inlet and an outlet connection, a cylinder secured in the said outlet connection and provided adjacent` thereto with aseries of circularly arranged discharge ports, a piston fitting looselywithf" in the cylinder normally placed between the said discharge ports andthe said outletconnection, a rod connected to the piston, a flange. connected to the rod eXteriorly of the opposite end of the cylinder, Ya member. pivotally connected to the saidflange, and meansl connecting the said member to the jacent the said outlet connection and between said support for regulating the pressure atV 3; -In a relief valve, and.V 1n a support, a headsecuredto the said sup-V port, an inlet connection in the said head, a` cylinder fixed in the said head-and eX- tending` therefrom and provided With a sefY ries of ports .adjacent the said head, a pis? ton fitting loosely within they cylinder, a piston rod connectedto thepiston, a flange connected to the said piston `rod exteriorly of the cylinder at the free end thereof, lugs connected to the said flange, a yoke pivotally connectedto the said lugs and spanning the said cylinder, and adjustable means connecting the said yoke to the said support for normally` maintainingV the said yoke, fiange, rod and piston in position and regu@ combination,

lating` the pressure at which the said'piston will operate.

4. In a relief'valve, and in combination, a support, a headfsecured to the said support, an inlet .connection in the said head, a cylinder fixed in the said head and eXtendi ing therefrom and provided with a series-l the said cylinder, a rod connected to the piston in position and regulating the pressadyoke, a lever pvotally connected to the sure at which the said piston will operate. end of the said rod, a bracket secured to the Signed by ine this 5th day of Aug. 1914. 10

said support, and a spring connected be- LEWIS AUGUSTUS ASPINWAL. tween the said bracket and the free end of Witnesses :4

the said lever for normally maintaining GEO. N. WHITNEY,

the said rod, yoke, ange, piston rod and F. B. CHANDLER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. G.

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