US2484387A - Pump - Google Patents

Description

D. e. MILLER 7 2,484,387

Oct. 11, 1949.

PUMP

Filed July 27, 1945 ZorIaZa $212770? M a Attorneys Patented Oct. 11, 1 949 UNITED STATES PATENTOFFICE PUMP 7 Donald G. Miller, Reno, Nev. V

Application July 27, 1945, Serial No. 607,404

5 Claims. (01. 103--37) This invention relates to a pump and particularly to a high-pressure pump, it being one object of the invention to provide a pump so constructed that when it is in operation pressure may be maintained at a constant degree and thereby cause fluid discharge from the pump to be subjected to a constant pressure during operation of the pump.

Another object of the invention is to providea pump havin a piston slidably mountedin a cylinder for reciprocating movement therein, the

cylinder being shiftable longitudinally and yield: ably held against movement in one direction so the cylinder that adjustments may be made to regulate the amount of pressure which may be exerted by the piston before the cylinder moves" with the piston to prevent excessive pressure being applied to the liquid.

Another object of the invention is to provide a pump so constructed that it maintains the same pressure at any speed as long as the capacity is large enough.

Another object of the invention is to so construct the pump that it will maintain the prede termined pressure and at the same times does not pull on the source of power due to the fact that its spring pushes in favor of the powerduring half the revolution of the drive shaft.

Another objectof the invention is to provide a pressure-controlled pump which is simple in construction, easily adjusted for predetermined pressure, and not liable to get out of order when in use. panying drawings, wherein:

Figure 1 is a sectional view takenlongitudinally through the improved pump,

Figure 2 is a sectional view taken along the line 22 of Figure 1,

Figure 3 is a sectional view upon an enlarged,

scale taken along the line 3-3 of Figure 1, and

Figure 4 is a view looking at one end of the pump.

This improved pump has a cylinder l formed with a longitudinally extendingbore or chamber and havingthick walls so that it may with-' stand high pressure. The cylinder l is disposed horizontally and slidably mounted throughv an opening 3 formed in a standard 4 rising from a base 5. At its front end the cylinder is externally thickened to form a collar 6 for limiting sliding movement of the cylinder in one direction and through this end portion of the cylinder The invention is illustrated in the accom- 2 are formed radially extending ports 1 and 8 constituting an'inlet. and an outlet for the pump. Check valves 9 and II) are mounted in outer end portions of the ports'land 8, the valve 9 being an inwardly opening valve and the valve I0 an outwardly opening valve. These valves not only serve for controlling flow of fluid into and out of the chamber 2 of the pump,-but also constitute nipples to which pipes may be connected by flexible connections for leading liquid to and from the pump.

A piston l I is slidably received in the chamber 2 and in order to prevent leakage, the rear end of the cylinder has been provided with a pack- 1 ing gland l2 by means of which packing I3 is compressed tightly about the piston. The rear end of the piston is pivoted to a pitman M by a pin l5 and at its rear end the pitman is formed with .a sleeve or collar l6. which is circular in shape and fits about a circular cam-block ll carried by a drive shaft IS. The drive shaft is rotatably mounted through standard I!) carried by base 5 and rotary motion may be imparted to the shaft by a belt trained about a pulley 20 or in any other desired manner. During rotation of the drive shaft, reciprocating movement is imparted to the piston and as this piston reciprocates in the cylinder, liquid is drawn inwardly through the intake port-1 and expelled through As pressure exerted by the piston increases during forward movement of the piston in a power stroke, it is desired to prevent this pressure from increasing beyond a predetermined point. Therefore, the cylinder has been slidably mounted through the standard 4. A shaft or plunger 2| extends forwardly from the front end of the cylinder. and slidably passes through a sleeve 22 which is slidably mounted through an opening 23 formed horizontally through a standard 24 carried by the base. This sleeve serves as an adjustable abutment for one end of a helical spring 25 coiled about the plunger 2| and having its rear end bearing against the front end of the cylinder, and when pressure exerted by the forwardly moving piston reaches a predetermined point, additional pressure will cause action of the spring 25 to be overcome and the cylinder will move forwardly with the piston. Therefore,the pressure may only be built up to a predetermined degree in the chamber 2. At its front end the sleeve 22 fits into an opening 26 formed through a lever 21 which is disposed vertically and has its. lower end pivotally mounted between the ears 28 ofa bracket 29 by a pin or shaft 30. The sleeve is held in the opening 26 by screws 3! which are threaded through the lever from opposite side edges thereof and have their inner ends engaged in an annular groove 32 formed about the sleeve and from an inspection of GO Figure 1 it will be readily understood that when the lever is swung longitudinally of the base 5, tension of the sprin 25 may be regulated so that the cylinder I will be prevented from moving longitudinally in a forward direction until pressure within the chamber 2' is increased to such an extent that action of the spring is overcome. The bracket 29 is formed at its front end with an upstanding head board 33 having a threaded opening formed near its upper end and through this opening passes an adjusting screw 34. The inner or rear end of screw 34 has abutting en'- gagement with lever 21 and by adjusting this screw the lever may be prevented from swinging forwardly beyond a position in which predetermined tension will be applied to the spring. By turning the screw in a loosening direction, the lever may be permitted to move toward the position indicated by dotted lines in Figure 1 to decrease tension .up onv the spring and allow movement of the cylinder with the piston at a lower pressure and by turnin the screw in a tightening direction the lever may be swung toward standard 24 and thus increase tension upon the spring. The pump may therefore be accurately set for any predetermined pressure.

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the invention after considering the description in connection with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

Minor changes inthe shape, size and arrangement of details coming within the field of invention claimed maybe resorted toin actual practice, if desired.

Having thus described the invention, what is claimed is:

1. A pressure-controlled pump comprising a cylinder mounted for sliding movement, means on the ends of said cylinder for limiting its endwise movement, a piston mounted for reciprocating movement in said cylinder, said piston being retained in said cylinder at all times, spring means yieldably resisting movement of. the cylinder during movement. of the piston in a power stroke, and pivoted means for regulating tension of said spring and allowing movement of the cylinder with the piston when pressure. exerted by the piston exceeds a predetermined degree.

2. A pressure-regulated pump comprising a support, a cylinder slidable longitudinally through said support, a, piston mounted for reciprocating movement in. said cylinder, said piston being retained in said cylinder at all times, a bar extending from said, cylinder, a second support, a sleeve shiftable longitudinally through the second support and. slidably receiving said bar, a spring about said bar between said sleeve and said cylinder yieldably resisting movement of the cylinder during a power stroke of the piston, and pivoted means for shifting said sleeve longitudinally to adjustedposition for placing the spring under predetermined tension.

3. A pressure-regulated pump. comprising a base, a support carried by said base, a cylinder slidable longitudinally through said support, a reciprocating piston operating in said cylinder, a second support carried by said base and formed with an opening, a sleeve shiftable. longitudinally through the second support, a bar extending from said cylinder and, slid'ably engaged in said sleeve, 2. spring about said bar between the cylinder and the confronting end of said sleeve, a

mounting carried by said base, a lever pivoted to said mounting and pivotally connected with said sleeve, and a set-screw carried by said mounting and engaging said lever to limit movement of the lever away from the second support and place said spring under predetermined tension.

4. A pressure-regulated pump comprising a base, a support extending upwardly from said base, a cylinder slidable longitudinally through said support, a piston mounted for reciprocatingmovement'in, said cylinder through the rear end thereof, bearings carried by said base, a drive shaft rotatably carried by said bearings, a cam disc carried by said drive shaft, a pitman about said cam disc pivoted to the rear end of said piston for reciprocating the piston during rotation of the drive'shaft, a second support carried by said base; forwardly of the first support, a sleeve slidable through the second support, a, bar extending forwardly from the front end of said cylinder andslidably received in said sleeve, a spring about said bar having its ends in abutting engagement with: the front end of the cylinder andthe rearend of the sleeve, a mounting bracket. carried by said base forwardly of the second support and having ears spaced transversely from each other and a head board extending upwardly above its ears, a lever pivotally mounted at its lower. end between said ears and having its upper portion formed with an opening into which the forward end of said sleeve extends, screws passing through said lever from opposite side faces thereof with their inner ends engaging in a circumferentially extending seat adjacent the front end of said sleeve, and a setscrew threaded through the head board with its inner end abutting. said lever to limit forward movement of the lever and apply predetermined tension to said. spring- 5. A pressure-regulated pump comprising a base, a support extending upwardly from said base, a cylinder slidable through said support in a direction longitudinally of the base, a piston mounted for reciprocating movement in the cylinder through the rear end, thereof, drive means carried by said base and connected with the rear end. of said piston, a second support carried by said base forwardly of the first support, a bar extending forwardly'from the front end of said cylinder, a sleeve slidable through said second support in a direction longitudinall of the base and slidably receiving said bar, a spring about said bar between the front end of the cylinder and the rear end of said sleeve, a mounting carried by said base forwardly of the second support, a lever disposed vertically with its lower end pivoted to said mounting and having its upper portion pivotally connected with the forward end of said sleeve and an abutment adjustably carried by said mounting for engagement by said lever to limit forward movement of the lever and control tension of the spring. DONALD G. MILLER.

REFERENCES CITED The following, references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,932,921 Bizzarri Oct. 31, 1933 2,038,311 Paisons Apr. 21, 1936

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