US2813660A - Metering pumps - Google Patents

Description

Nov. 19, 1957 L. DUNNING 2,813,660

METERING PUMPS Filed Aug. 23, 1954 2 Sheets-Sheet l INVENTOR: L ay/75017 fiUfiiZZ/ij,

ATTORNEYS.

L. DUNNING METERING PUMPS Nov. 19, 1957 2 Sheets-Sheet 2 Filed Aug. 25. 1954 A TTORNEYS.

Unite METERING PUMPS Application August 23, 1954, Serial No. 451,577 2 Claims. 01. 2 2-3 This invention relates to pumps, particularly rotary pumps with incorporated metering means for indicating the amount of fluid delivered by them.

My invention is directed primarily toward the provision of a pump of the kind referred to which is simple in cons'truction; which lends itself to expeditious production in quantity at small cost; and which, moreover, is fool proof and immune against easy-derangement in protracted use.

Other objects and attendant advantages will appear from the following detailed description of the attached drawings, wherein:

Fig. 1 shows in front elevation, a metering pump conveniently embodying my invention.

Fig. 2 is a side view of the pump with a portion thereof broken out and shown in section to expose important structural details which otherwise would be hidden; and

Fig. 3 is a fragmentary detail sectional view taken as indicated by the angled arrows IIIIII in Fig. 2, and drawn to a larger scale.

As herein exemplified, my improved metering pump has a main cup-shaped casing component with a cover plate 11 removably secured thereto by screw bolts 12. At its bottom, main casing component 10 is provided with an inlet 13 for connection of a pipe 14 leading from a source of fluid supply (not shown), and at the top with an outlet 15 for connection of a delivery pipe 16.

Eccentrically disposed within the casing is a rotor 17 whereof the drive shaft 18 extends outward through a fluid sealed bearing 19 on the cover plate 11; and to the external end of said shaft is secured an actuating crank handle 20. Rotor 17 has uniformlyspaced grooves extending inwardly from its periphery in which impeller blades 22 are slidably guided and yieldingly urged outwardly by springs (not shown) for maintenance of their distal end edges in eifective engagement with the inner peripheral surface of main casing component 10. When crank handle 20 is turned clockwise in Fig. l, fluid is drawn upward through the supply pipe 14 by action of the rotor blades 22 and discharged through the delivery pipe 16 in a manner characteristic of such pumps.

Integrally cast or molded with the cover plate 11 at the top, in accordance with my invention, is a hollow circular offset 24 whereof the axis is in vertical alignment with the axis of the casing as will be seen from Fig. 1. The offset 24 is itself provided with a cover plate 25 with a dial face 26, said plate being removably secured to said offset by a plurality of circumferentially arranged cap screws 27. Marked or otherwise formed on dial 26 ad jacent its periphery are graduations 28 of which alternate ones are numbered from 0 to 9 to indicate fluid gallons delivered by the pump. Rotatively supported in the axis of the cover plate 25 and extending through it is a shaft 29 to the outer end of which is secured, by a pin 30, a flexible pointer 31 for coordination with the dial graduations 28; and mounted upon the inner end of shaft 29 between a pair of friction washers 32 and 33 of cork or the like is a toothed wheel 35. Within the counter ttfi Patent 2,813,660 Patented Nov. 19, 1957 2 bore 36 in the hub 37 of pointer 31 is a helical spring 38 which surrounds shaft 29 and which is in compression between two metallic washers 39 and 40 loose on said shaft, the former of said washers bearing against the bottom of bore 36 and the latter bearing against a sealing ring 41 interposed between it and the outer face of cover plate 25. Friction washer 33 is engaged from the rear by a backing disk 42 of metal secured by a screw 43 to the inner end of shaft 29.

As a consequenceof this construction and arrangement, it will be seen that, by the force of spring 38, the friction washers 32 and 33, whereof the former abuts the inner face of cover plate 25, will restrain wheel 31 and prevent it from over-running when intermittently picked by the means presently described, said spring acting at the same time upon sealingring 41 to prevent fluid leakage around shaft 29.

Disposed at an inclination within the offset 24 of the pump casing, as shown in Figs. 1 and 3, is a rod 45 whereof the end portions are slidably engaged in guide bosses 46 and 47 respectively formed on the circumferential wall of said offset 24 and on the bearing 19 of rotor shaft 18. The helical spring indicated at 49 functions to maintain the inner end of rod 45 yieldingly in contact with rotor shaft 18 at which point the latter is provided with a depression 18a as best shown in Fig. 3, for camming action with said rod. With one end thereof loosely engaged inclinedly upon rod 45 between a collar 50 thereon, and one end of spring 49, is a pawl element 51 which is fashioned to angular configuration from flexible strip metal, the distal end portion of said element extending into tangential relation to the wheel 35 with its tip yieldingly contacting the teeth of said wheel. As will be noted from Fig. 2, the width of pawl element 51 is slightly less than that of the interspace between the back wall of offset 24 and casing cover plate 11, it being thereby confined to movement in the plane of wheel 35.

To operate the pump, crank 20 is turned clockwise in Fig. 1. During each rotation of shaft 18, slide rod 45 is reciprocated to cause picking of wheel 35 by the distance of one tooth, with attendant rotative shifting of the pointer 31 clockwise by one degree. Upon release of crank 20 after the desired number of fluid gallons have been delivered by the pump through pipe 16, the pointer 31 is moved counterclockwise back to zero position against a fixed stop 52 projection on the dial in readiness for a succeeding use of the pump, this resetting of the pointer being made possible by reason of the capacity of the friction washers 32 and 33 to slip relative to wheel 35 which is held against retrogression by pawl 51, the latter operating at this time as a detent. When more than ten gallons are pumped, the flexible pointer 30 simply rides over the stop 52 which is inclined to facilitate its overtravel by said pointer.

For the purposes of theft prevention, I have provided an angular keeper 56 which, see Fig. 2, is pivoted to a lug 57 at the front of the cover plate 11 of the pump casing. By swinging the keeper 56 upward, as shown in dot and dash lines, a hole 58 therein registers with a hole 59 in crank 20 when the latter is in down position, for connection of a suitable padlock, not illustrated.

Having thus described my invention, I claim:

1. In a metering pump, a hollow casing with an inlet port and an outlet port; a rotor operable within the hollow of the casing for displacing fluid from the inlet port to the outlet port; a drive shaft for the rotor extending outward through a bearing in a side wall of the casing; a hollow offset on said side wall eccentrically disposed relative to the rotor shaft and having an indicator dial at the front thereof; a coordinating pointer affixed to a shaft extending inwardly through an axial bearing in the dial to the interior of the offset; and mechanism within the olfset actuated from the rotor shaftforimparting intermittent rotary shifts to thepointershaft, said mechanism including a toothed wheel on the inner end of the pointer shaft, a rod slidingly supported at opposite ends for endwise movement tangentially of the wheelgin spaced guide bearings within the oflset, a helical spring sur: rounding the rod in the interval between the guide bearings,and a pawl, for picking the ratchet wheel, loosely engagedonthe rod between one end of the 'springand a collar on the rod, and means for reciprocating the rod in opposition to the spring pressure during each rotatio of the Pump shaft. 7 p

2. In a metering pump, a hollow casing with an inlet port and an outlet port; a rotor operable within the hollow of the casing for displacing fluid from the inlet port to the outlet port; a drive shaft for the rotor extending outward through a bearing in a side wall of the casing; a hollow ofiset' on saidside wall eccentrically disposed relative to the rotor shaft and having an indicator dial at the front thereof; a coordinating pointer affixed to a shaft extending inwardly through an axial bearing in the dial to the interior of the offset; and mechanism within the offset actuated from the rotor shaft for imparting intermittent rotary shifts to the pointer shaft, said mechanism including a toothed wheel on the inner end of the pointer shaft,"a rod constrained to axial movement, a spring influential upon the rod to maintain one end thereof in operative engagement with a cam on the rotor shaft, a pawl on the rod for picking the teeth of the wheel, two friction washers one of which bears upon the inner face of the front wall of the offset and the other of which bears against the rear face of the wheel, a sealing ring surrounding the outer end of the pointer shaft to bear against the outer face of the bearing offset, a helical spring surrounding the outer end of the pointer .shaft within a counter bore in a hub on the pointer, said spring being in compression between the sealing ring anda collar on the pointer shaft and tending to draw the pointer shaft outwardly for maintenance of a backing disk at the inner end of said shaft in pressure engagement with said other friction washer to normally restrain the wheel against independent rotation but allow the pointer to be returned to zero position after each use of the pump.

References Cited in the file of this patent UNITED STATES PATENTS

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