US3240154A - Rotary pumps - Google Patents

Rotary pumps Download PDF

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Publication number
US3240154A
US3240154A US320647A US32064763A US3240154A US 3240154 A US3240154 A US 3240154A US 320647 A US320647 A US 320647A US 32064763 A US32064763 A US 32064763A US 3240154 A US3240154 A US 3240154A
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United States
Prior art keywords
chamber
impeller
pump
shaft
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US320647A
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English (en)
Inventor
Robbins Keith Victor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FERRY DIAMOND ENGINEERING COMP
FERRY-DIAMOND ENGINEERING Co Ltd
Babcock and Wilcox Co
Original Assignee
FERRY DIAMOND ENGINEERING COMP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of US3240154A publication Critical patent/US3240154A/en
Assigned to BABCOCK & WILCOX COMPANY THE, A CORP. OF NJ. reassignment BABCOCK & WILCOX COMPANY THE, A CORP. OF NJ. MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE:03/31/78 A CORP. OF NJ. Assignors: DIAMOND POWER SPECIALTY CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/40—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C2/08 or F04C2/22 and having a hinged member
    • F04C2/44—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C2/08 or F04C2/22 and having a hinged member with vanes hinged to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C5/00—Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/40—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C2/08 or F04C2/22 and having a hinged member

Definitions

  • This invention relates to rotary positive displacement pumps of the type wherein the pumping action is effected by a flexible vaned impeller which is rotated by an impeller shaft in a chamber of substantially circular section, formed in the pump body, liquid being introduced to, and delivered from the chamber, circumferentially, by suction and delivery ports which are angularly spaced apart around the chamber circumference.
  • the above type of pump commonly employs an offset segment, which comprises an inner member of relatively small radial extent attached to, and formed integrally with the peripheral wall of the pump chamber, and located between the delivery port and the suction port when considered in the direction of rotation of the impeller.
  • the action of the offset segment is to flex and radially compress the impeller vanes as each of these encounter the segment (after traversing the delivery port) and the subsequent release of the vanes, as each of these leaves the segment in the region of the suction port with a whip-like action, enhances the suction effect at this port and consequently enhances the overall pumping action.
  • sealing means are provided between the rotating impeller shaft, and the stationary pump body to prevent liquid escaping from the pump chamber, the sealing means commonly being in the form of annular shaft seals, housed in the pump body.
  • Pumps of this type are particularly useful for handling organic liquids such as for example beer, milk or other foodstuffs, and when employed for this purpose it is desirable that all the pump components be readily accessible for the purpose of cleaning.
  • the invention consists in a rotary positive displacement pump of the type indicated wherein the sealing means for one end of the pump chamber and the offset segment are displaceable, the sealing means at least being carried on a displaceable seal housing slidable axially on the impeller shaft, and the arrangement being such that said seal housing, the offset segment, and the impeller which latter is axially slidable on the impeller shaft, are readily withdrawable from the opposite end of the chamber after removal of a cover plate.
  • the invention further consists in a rotary positive displacement pump of the type indicated in which the sealing means for one end of the pump chamber, and the offset segment are separable from the pump body, the sealing means at least being carried by a displaceable seal housing axially slideable on the pump impelled shaft for positioning within the pump chamber, access to which is attained through an opening in the end of the chamber remote from the seal housing end, a cover plate, sealing means and attachment means being provided for said opening such that for assembling the pump, the seal housing, segment and pump impeller may be successively slid into position within the chamber and the cover plate attached, locating means being provided for circumferentially locating the offset segment between the suction and delivery 3,240,l54 Patented Mar. 15, 1966 ports, whilst for stripping the pump, the cover plate may be removed whereupon all the pump components are readily accessible for successive withdrawal.
  • a helical thrust spring is provided for positioning around the impeller shaft between the seal housing and an end abutment formed in the pump body, the action of which, when the pump is assembled is to exert axial pressure on the seal housing and the adjacent impeller and thus effect an enhanced pressure sealing effect between the remote end of offset segment and the end cover plate. Furthermore, on stripping of the pump, the thrust spring serves to move the seal housing, and impeller towards the open end of the pump chamber which facilitates their removal.
  • the pump may be close coupled to an electric motor, in which case the pump body has a flange formed at the thrust spring end of the housing, for bolting to the motor framework, the motor shaft serving also as the pump impeller shaft.
  • the pump may be an independent unit, having a separate shaft, a bare extension of Which projects from the thrust spring end of the pump housing which is provided with its own shaft bearings, bearing housing and body bracket.
  • FIGURE 1 is a side elevation partly in section of a pump close coupled to an electric driving motor
  • FIGURE 2 is an end elevation of the pump-motor combination in the direction of the arrow II on FIGURE 1, and with the pump end cover plate removed.
  • FIGURE 3 is an exploded perspective view of the combination
  • FIGURE 4 is a fragmentary plan view of a motor and pump combination showing, partly in section, the fitting of an external recirculatory by-pass between the pump section and delivery branches, and
  • FIGURES 5 and 6 are sectional elevations through a pump body incorporating an internal recirculatory by-pass between the suction and delivery ports.
  • a rotary pump generally indicated at 1 of the flexible, vaned rotary impeller type is designed for close coupling to a suitable electric motor 2, the extended shaft 3 of which forms the pump impeller shaft, and to this end, one end of the pump body is provided with a flange 4 for bolting to the motor framework.
  • a cylindrical chamber 5 is formed in the pump body 6, such that when it is bolted to the motor, the chamber is co-axial with the motor shaft extension 3 (hereinafter referred to as the impeller shaft), the length of which is suflicient to extend to just short of that end of the chamber, which is completely open.
  • the opposite end of the chamber i.e. the motor end.
  • the chamber 5 is also provided with a pair of longitudinally co-planar, circumferentially spaced ports 10 and 11, for attachment to suction and delivery branches 12 and 13 respectively.
  • a seal housing 14 distinct from the pump body 6 is provided for the motor end of the chamber, and this comprises a cylindrical disc of external diameter equal to that of the pump chamber, so as to be a sliding fit therein, and having an internal bore for sliding on the impeller shaft.
  • the pump offset segment which comprises an insert member suitable for lining the chamber 5, and of circumferential extent sufficient to extend from the delivery port 11 to the suction port 10 when considered in the direction of impeller rotation, while being of sufiicient length, that when the seal housing is positioned in the chamber (see FIG. 1), to abut against the larger diameter 8 of the two above mentioned shoulders, the segment extends substantially to the open end of the chamber.
  • Locating means in the form of a circular section dowel 16 projecting into chamber 5, to cooperate with a groove 17 in the offset segment 15, is provided to ensure correct angular positioning and positive location of the segment, between the ports.
  • the seal housing 14 further, is provided with recesses 18 and 19 to accommodate an annular O-ring type seal 20, as well as an annular shaft seal, 21, on the side remote from the offset segment.
  • the recess in the in the pump chamber which is formed by the smaller of the above-mentioned. shoulders 7, is of such a diameter as to accommodate an axial spring 22 around the shaft, the diameter of which is equal to that of the shaft seal 21, against which the spring abuts through an affixed interposed pressure plate 23.
  • the spring may alternatively be of large diameter so as to abut against the seal housing instead of directly against the seal, but the seal-abutting arrangement is preferred.
  • a flexible vaned impeller 24 made of rubber, synthetic rubber, plastic or other suitably flexible material is provided, and has a central hole for mounting on the impeller shaft.
  • the impeller length is such that when in position in the chamber immediately adjacent the seal housing, and with the or each vane which is in the angular region of the offset segment being radially compressed thereby, it extends substantially to the open end of the chamber.
  • the impeller has any suitable means associated therewith for allowing axial sliding on the impeller shaft, whilst constraining same to rotate with the impeller shaft. 1
  • a cover plate 25 is provided for the open end of the chamber, the pump body at this end being formed into a flange to which the plate may be attached by bolts 26 and wing nuts 27, an O-ring type seal 28 being positioned between the flange and cover plate.
  • the offset segment also serves a secondary purpose as finger gripping means which facilitates the removal of the seal housing and. associated seals and dispenses with the necessity of providing tools to remove the internal seals.
  • the pump may be run for very short periods in a dry state, but, in many applications, it is advisable to guard against accidental dry-running, particularly where it is possible that this may continue for a sustained period.
  • a re-circulatory by-pass from the delivery port 11 to the suction port 10 of the pump may be provided. This pre-supposes there is liquid on the delivery side of the pump, as is to be expected under most conditions of operation.
  • a recirculatory by-pass may be either incorporated within the pump body as shown in FIGURES 5 and 6 or fitted as an external accessory as shown in FIGURE 4.
  • FIGURES 5 and 6 show a by-pass in the form of a groove 34 formed internally of the pump body 6 and connecting to outlet port 11 to the inlet port 10.
  • a percentage of liquid will be constantly re-circulated, both with and without a normal supply of liquid into the suction inlet of the pump.
  • this due to heating up within the pump when relying solely on the liquid being re-circulated, there will be a tendency for this to evaporate more rapidly than when the re-circulation is effected by means of an external by-pass.
  • the pumping action of the impeller tends to impede the return of liquid through the internal by-pass and, for these two reasons, internal bypas of the types described are only suitable where limited periods of dry-running are likely to occur.
  • FIGURE 4 shows details of suitable design.
  • a nozzle 29 leading from the delivery and having a restricted bore 30 is connected by a hand nut 31 to a flexible tube 32 which in turn is connected by a hand nut 33 to the pump suction branch 12.
  • the impeller shaft may extend through the end cover plate, suitable seal and bearing means being provided.
  • the pump may be produced as a distinct entity with an independent shaft and a suitable cover plate and shaft bearing at the motor end.
  • the pump may be provided with more than one offset segment, these being circumferentially spaced around the chamber. The additional segment, and even the original one, may furthermore, instead of being attached to the seal housing, be loose or be attached to the open end cover plate.
  • a rotary positive displacement pump comprising a pump body, a cylindrical pumping chamber formed in said body, an opening at one end of said chamber, an end wall at the other end of said chamber, circumferentially spaced inlet and outlet ports in said body leading into said chamber, an impeller shaft extending axially into said chamber, through said end wall, a flexiblevaned impeller slidably mounted on said shaft in said chamber for removal through said opening, means constraining said impeller to rotate with said shaft, a seal housing in said chamber between said impeller and said end wall, said seal housing being slidable on said shaft for manual removal from said chamber through said opening, first sealing means carried by said seal housing for minimizing the escape of liquid being pumped from said other end of said chamber, an olfset segment positioned against the walling of said chamber for fiexing said impeller vanes as said vanes rotate between said inlet and outlet ports, said offset segment being removable from said chamber through said opening, a cover plate releasably attached to the body to close said opening, and second sealing means
  • a rotary positive displacement pump having a body member formed with a cylindrical pumping chamher, an opening at one end of said chamber, an end wall at the opposite end of said chamber, an impeller shaft rojecting into said chamber through said end wall, an impeller in said chamber slidably mounted on said shaft for removal from said chamber through said opening, means containing said impeller to rotate with said shaft, a cover plate closing said opening, and circumferentially spaced inlet and outlet ports leading to the chamber through the body member, the combination of a seal housing in said chamber slidably mounted on said impeller shaft against said end wall for manual removal from said chamber through said opening, and sealing mean carried by said seal housing for minimizing escape of liquid from said opposite end of the chamber during pumping.
  • a rotary positive displacement pump comprising a body member, a cylindrical pumping chamber formed in said body member, an opening at one end of said chamber, an end wall at the other end of said chamber, circumferentially spaced inlet and outlet ports in said body member leading into said chamber, an impeller shaft extending axially into said chamber through said end wall, a fiexible-vaned impelled slidably mounted on said shaft in said chamber for removal through said opening, said impeller being constrained to rotate with said shaft, a combined seal housing and oifset segment member in said chamber having a seal housing portion between said impeller and said end wall and an offset segment portion against the walling of said chamber for flexing said impeller vane as said vanes rotate between said inlet and outlet ports, said combined member being slidably mounted on said shaft for removal from said chamber through said opening, first sealing means at said other end of said chamber for minimizing escape of liquid therefrom during pumping, a cover plate re leasably attached to the body member to close said opening, and second sealing means interposed
  • a rotary positive displacement pump comprising a body member, a cylindrical pumping chamber formed in said body member, an opening at one end of said chamher, an end wall at the other end of said chamber, circumferentially spaced inlet and outlet ports formed through said body member and leading into said chamber, an impeller shaft extending axially into said chamber through said end wall, a flexible-vaned impeller slidably mounted on said shaft in said chamber for removal through said opening, means constraining said impeller to rotate with said shaft, 21 combined seal housing and offset segment member in said chamber having a seal housing portion between said impeller and said end wall and an offset segment portion projecting from said seal housing portion and lying against the walling of said chamber for flexing said impeller vanes as said vanes rotate between said inlet and outlet ports, said combined member being slidably mounted on said shaft for manual removal from said chamber through said opening, a recess in said seal housing portion of said combined member, said recess surrounding said shaft and facing said end wall, an annular shaft seal in said recess,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US320647A 1962-11-08 1963-11-01 Rotary pumps Expired - Lifetime US3240154A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB42290/62A GB1004007A (en) 1962-11-08 1962-11-08 Improvements in and relating to rotary pumps

Publications (1)

Publication Number Publication Date
US3240154A true US3240154A (en) 1966-03-15

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ID=10423776

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Application Number Title Priority Date Filing Date
US320647A Expired - Lifetime US3240154A (en) 1962-11-08 1963-11-01 Rotary pumps

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US (1) US3240154A (enExample)
CH (1) CH414355A (enExample)
DE (1) DE1553043A1 (enExample)
GB (1) GB1004007A (enExample)
SE (1) SE310311B (enExample)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467019A (en) * 1966-09-02 1969-09-16 Diamond Power Speciality Rotary positive displacement pumping apparatus
US4171939A (en) * 1978-03-27 1979-10-23 Sundstrand Corporation Arrangement for mounting a gear on a shaft
US4772190A (en) * 1985-07-26 1988-09-20 Zahnradfabrik Friedrichshafen, Ag. Vane cell pump having resilient sealing means biasing the pressure plate
US5789886A (en) * 1993-01-07 1998-08-04 Ivice; Seymour Wiper motor and delay control with windshield washer pump
US5868558A (en) * 1995-06-14 1999-02-09 Parker; Alexander Martin Cover for fluid pumps
US6203302B1 (en) * 1998-10-15 2001-03-20 Hypro Corporation Rubber impeller pump
US20050196296A1 (en) * 2004-03-03 2005-09-08 Electrolux Home Products Corporation N.V. Electric motor-driven pump for washing machines and the like
US11512696B2 (en) * 2016-01-15 2022-11-29 Milwaukee Electric Tool Corporation Transfer pump
US11542941B2 (en) * 2018-02-16 2023-01-03 Tcs Micropumps Limited Pump apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126655B (en) * 1982-09-08 1986-01-15 Itt Jabsco Limited Rotary positive-displacement pumps

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1855061A (en) * 1930-01-14 1932-04-19 Firm Maschinenfabrik A D Sihl Centrifugal pump installation comprising an air-separating device
US2757681A (en) * 1953-10-02 1956-08-07 Jacuzzi Bros Inc Self-priming conversion unit for centrifugal pump systems
US2782723A (en) * 1951-10-22 1957-02-26 Jabsco Pump Co Shaft seal for pumps
US2853021A (en) * 1955-01-14 1958-09-23 Jabsco Pump Co Pump
US3074350A (en) * 1959-01-06 1963-01-22 R C Ray Portable pump with interchangeable drive unit
US3150593A (en) * 1961-04-24 1964-09-29 Waukesha Foundry Co Metering pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1855061A (en) * 1930-01-14 1932-04-19 Firm Maschinenfabrik A D Sihl Centrifugal pump installation comprising an air-separating device
US2782723A (en) * 1951-10-22 1957-02-26 Jabsco Pump Co Shaft seal for pumps
US2757681A (en) * 1953-10-02 1956-08-07 Jacuzzi Bros Inc Self-priming conversion unit for centrifugal pump systems
US2853021A (en) * 1955-01-14 1958-09-23 Jabsco Pump Co Pump
US3074350A (en) * 1959-01-06 1963-01-22 R C Ray Portable pump with interchangeable drive unit
US3150593A (en) * 1961-04-24 1964-09-29 Waukesha Foundry Co Metering pump

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467019A (en) * 1966-09-02 1969-09-16 Diamond Power Speciality Rotary positive displacement pumping apparatus
US4171939A (en) * 1978-03-27 1979-10-23 Sundstrand Corporation Arrangement for mounting a gear on a shaft
US4772190A (en) * 1985-07-26 1988-09-20 Zahnradfabrik Friedrichshafen, Ag. Vane cell pump having resilient sealing means biasing the pressure plate
US5789886A (en) * 1993-01-07 1998-08-04 Ivice; Seymour Wiper motor and delay control with windshield washer pump
US5868558A (en) * 1995-06-14 1999-02-09 Parker; Alexander Martin Cover for fluid pumps
US6203302B1 (en) * 1998-10-15 2001-03-20 Hypro Corporation Rubber impeller pump
US20050196296A1 (en) * 2004-03-03 2005-09-08 Electrolux Home Products Corporation N.V. Electric motor-driven pump for washing machines and the like
US11512696B2 (en) * 2016-01-15 2022-11-29 Milwaukee Electric Tool Corporation Transfer pump
US11542941B2 (en) * 2018-02-16 2023-01-03 Tcs Micropumps Limited Pump apparatus

Also Published As

Publication number Publication date
DE1553043A1 (de) 1969-11-06
GB1004007A (en) 1965-09-08
CH414355A (fr) 1966-05-31
SE310311B (enExample) 1969-04-21

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Legal Events

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AS Assignment

Owner name: BABCOCK & WILCOX COMPANY THE, A CORP. OF NJ.

Free format text: MERGER;ASSIGNOR:DIAMOND POWER SPECIALTY CORPORATION;REEL/FRAME:003854/0861

Effective date: 19780331

Owner name: BABCOCK & WILCOX COMPANY THE, A CORP. OF NJ., NEW

Free format text: MERGER;ASSIGNOR:DIAMOND POWER SPECIALTY CORPORATION;REEL/FRAME:003854/0861

Effective date: 19780331