US3635580A - Centrifugal refrigerant gas compressor capacity control - Google Patents

Centrifugal refrigerant gas compressor capacity control Download PDF

Info

Publication number
US3635580A
US3635580A US14471A US3635580DA US3635580A US 3635580 A US3635580 A US 3635580A US 14471 A US14471 A US 14471A US 3635580D A US3635580D A US 3635580DA US 3635580 A US3635580 A US 3635580A
Authority
US
United States
Prior art keywords
throttle
disk
intake passage
piston
impeller
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
US14471A
Other languages
English (en)
Inventor
Douglas K Richardson
John G Johnson
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.)
Daikin Applied Americas Inc
Original Assignee
Westinghouse Electric Corp
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
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Application granted granted Critical
Publication of US3635580A publication Critical patent/US3635580A/en
Assigned to MCQUAY-PERFEX, INC., A CORP. OF MN reassignment MCQUAY-PERFEX, INC., A CORP. OF MN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA
Assigned to MCQUAY INC. reassignment MCQUAY INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MCQUAY-PREFEX INC.
Assigned to SNYDER GENERAL CORPORATION reassignment SNYDER GENERAL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MCQUAY INC.
Assigned to CITICORP INDUSTRIAL CREDIT, INC. reassignment CITICORP INDUSTRIAL CREDIT, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MCQUAY INC., A MN CORP.
Assigned to CITICORP INDUSTRIAL CREDIT INC. reassignment CITICORP INDUSTRIAL CREDIT INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SNYDERGENERAL CORPORATION
Assigned to CITICORP NORTH AMERICA, INC. reassignment CITICORP NORTH AMERICA, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SNYDERGENERAL CORPORATION, A MN CORP.
Anticipated expiration legal-status Critical
Assigned to MCQUAY INC., A CORP. OF MINNESOTA, SNYDERGENERAL CORPORATION, A CORP. OF MINNESOTA reassignment MCQUAY INC., A CORP. OF MINNESOTA RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CITICORP NORTH AMERICA, INC.
Assigned to SNYDERGENERAL CORPORATION A CORP. OF DELAWARE reassignment SNYDERGENERAL CORPORATION A CORP. OF DELAWARE RELEASE BY SECOND PARTY OF A SECURITY AGREEMENT RECORDED AT REEL 5013 FRAME 592. Assignors: CITICORP NORTH AMERICA, INC. A CORP. OF DELAWARE
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
    • F04D29/464—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps adjusting flow cross-section, otherwise than by using adjustable stator blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0253—Surge control by throttling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F04D29/444—Bladed diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
    • F25B1/053—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of turbine type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/51—Inlet

Definitions

  • ABSTRACT A capacity control for a refrigerant gas compressor is comprised of a throttle disk in a throttle in nozzle intake passage extending to rotatable centrifugal gas impeller an are positioned within the nozzle i [2]] Appl. No.:
  • a throttle intake passage leads through a nozzle intake passage that extends to the rotatable centrifugal gas compressor impeller.
  • a throttle disk is pivotally mounted with the throttle intake passage and is movable from a minimum capacity position with the disk positioned transverse to the gas flow to a maximum capacity position with the disk positioned in parallel to the gas flow.
  • a plurality of flowdirecting vanes are positioned within the nozzle intake passage that extends between the throttle disk passage and the impeller vanes.
  • the throttle disk may be provided with at least one aperture to predetermine the gas flow for the minimum capacity of the gas compressor.
  • a ring piston is concentrically positioned about the outer walls of the throttle intake passage and is connected by suitable linkage such as a bellcrank to translate the reciprocatory movement of the piston to pivotal movement of the piston to pivotal movement of the throttle disk.
  • a cylinder is arranged concentric to the outer walls of the throttle intake passage and surrounding the piston so that fluid under pressure may be selectively applied to either side of the piston to move the piston accordingly.
  • FIG. 1 is a fragmentary sectional view partly in elevation of a centrifugal gas compressor with the capacity control of the invention and showing the throttle disk in the full capacity position;
  • FIG. 2 is a view similar to FIG. I but showing only the throttle passage and the intake nozzle passage with the throttle disk in the minimum capacity position;
  • FIG. 3 is a fragmentary section on the line lIIIIl of FIG. 2;
  • FIG. 4 is an even more fragmentary view similar to FIG. 2 but showing the throttle disk in an intermediate capacity position
  • FIG. 5 is a section on the line V-V of FIG. 4.
  • the centrifugal refrigerant gas compressor is shown to include the rotatable impeller 10 mounted on the end of the impeller shaft 111 for rotation therewith, A gas-collecting scroll 12 is positioned to surround the impeller 10 and collect through the diffuser structure the compressed gases issuing; from the compressed gas passages 13 of the impeller 10.
  • the impeller 10 is also provided with intake gas passages 14 that are centrally located and the rotation of the impeller 10 causes the gas entering the impeller intake passages 14 and passing between the impeller vanes such as shown at 15, to be discharged under pressure from the discharge passages such as shown at 13 around the periphery of the impeller 10 as is well known to those skilled in the art.
  • this invention provides for a novel arrangement of movable throttle disk 20 and a plurality of gas directing vanes such as shown at 20 through 23. It should be understood that the invention is not limited to any particular number or precise configuration or angle of direction of the gas flow directing vanes 20-23.
  • the throttle disk 20 is mounted within a throttle intake housing 30 and is pivotal therein from the maximum capacity position shown in FIG. 1 to the minimum capacity position shown by FIG. 2 of the drawings.
  • the throttle disk 20 is secured to pivotal stub shafts 31 and 32.
  • the stub shaft 31 is connected by a bellcrank 33 and the stub shaft 32 is connected by a bellcrank 34 to respective pins 35 and 36 received in a groove 37 of a reciprocatory piston 38.
  • the piston 38 is a ring piston concentrically mounted around the outer wall 39 of the throttle intake passage 30.
  • a cylinder wall 40 is also concentrically mounted around the outer wall 39 of the throttle intake passage 30 in a manner to enclose the reciprocatory piston 38 and fluid under pressure is introduced within the cylinder selectively to either or both sides of the piston 38 for reciprocating the piston accordingly in a manner to move or maintain the throttle disk 20 at a desired position.
  • the aforementioned US. Pat. Nos. 3,350,897 and 3,362,185 disclose various ways for valving fluid under pressure to either or both sides of a capacity control piston such as the piston 38 as used in the present invention. Since the arrangement for supplying fluid under pressure selectively to either or both sides of the piston 38 is not a part of the present invention, and any suitable arrangements well known to those skilled in the art may be used, the details of such an arrangement have been omitted from the present disclosure.
  • a nozzle intake passage 50 is positioned between the throttle intake passage 30 and the impeller 10 to converge and direct the gas flow from the throttle disk 20 into the intake passages 14 of the centrifugal gas compressor impeller 10.
  • a feature of the invention is the provision of the aforementioned gas flow directing vanes such as shown at 2043, to direct the flow of gas coming from the throttle disk 20 to the centrifugal gas impeller.
  • the throttle disk 20 is provided with the aperture 25, which, when the throttle disk 20 is in the minimum capacity position shown by FIG. 2 of the drawings, provides a minimum gas flow into the intake nozzle 50 and the gas impeller.
  • This invention is not limited to the provision of a centrally located aperture such as shown at 25 but one or more apertures :may be used in various positions as will be obvious to those skilled in the art.
  • a capacity control for a centrifugal refrigerant gas compressor having a rotatable impeller with centrally located intake passages and peripherally located compressed gas passages comprising, a throttle intake passage, a nozzle intake passage extending from said throttle intake passage to the centrally located intake passages of said impeller, a throttle disk pivotally mounted in said throttle intake passage and having at least one aperture for determining the minimum capacity of said compressor when the throttle disk is in a minimum capacity position, means to move said disk from a position transverse to the gas flow for minimum capacity to a position parallel to the gas flow for full capacity and any position therebetween, and a plurality of gas flow directing and straightening vanes extending within said nozzle intake passage to direct the flow of gas into said impeller after passage from said throttle disk.
  • the means to move said disk is comprised of a ring piston concentrically mounted on the outside of said throttle intake passage and connected to said disk by means of a bellcrank to translate reciprocatory movement of said piston to pivotal movement of said disk, and means to enclose said piston in a cylinder concentric with said throttle intake passage for applying a fluid under pressure within said cylinder to either side of said piston for reciprocating the piston in accordance therewith.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Air Conditioning Control Device (AREA)
US14471A 1970-02-26 1970-02-26 Centrifugal refrigerant gas compressor capacity control Expired - Lifetime US3635580A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1447170A 1970-02-26 1970-02-26

Publications (1)

Publication Number Publication Date
US3635580A true US3635580A (en) 1972-01-18

Family

ID=21765707

Family Applications (1)

Application Number Title Priority Date Filing Date
US14471A Expired - Lifetime US3635580A (en) 1970-02-26 1970-02-26 Centrifugal refrigerant gas compressor capacity control

Country Status (5)

Country Link
US (1) US3635580A (enrdf_load_stackoverflow)
JP (1) JPS461736A (enrdf_load_stackoverflow)
BE (1) BE763359A (enrdf_load_stackoverflow)
FR (1) FR2079045A5 (enrdf_load_stackoverflow)
GB (1) GB1287867A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213307A (en) * 1978-11-13 1980-07-22 Westinghouse Electric Corp. Oil separation and return system for centrifugal refrigerant compressors
US4789300A (en) * 1983-06-16 1988-12-06 Rotoflow Corporation Variable flow turbine expanders
US4850796A (en) * 1988-05-25 1989-07-25 Sundstrand Corporation Centrifugal pump with splitter vane/shut-off valve system
US5224820A (en) * 1991-09-25 1993-07-06 Societe Nationale D'etude Et De Construction De Moteurs D'aviation Operating mechanism for variably settable blades of a turbomachine
US5408708A (en) * 1993-10-29 1995-04-25 Vico Products Manufacturing Co., Inc. Flow-control for a pump
US20050263199A1 (en) * 2002-11-26 2005-12-01 David Meheen Flow laminarizing device
WO2008036832A1 (en) * 2006-09-21 2008-03-27 Borg Warner Inc. Turbine housing with integrated ribs
DE102014101213A1 (de) * 2014-01-31 2015-08-06 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verdichteranordnung für einen Turbolader eines Kraftfahrzeuges
CN105715360A (zh) * 2014-12-17 2016-06-29 霍尼韦尔国际公司 配平可调式离心压缩机和具有该压缩机的涡轮增压器
CN106104006A (zh) * 2014-03-31 2016-11-09 三菱重工业株式会社 离心压缩机、增压器及离心压缩机的制造方法
EP3534014A1 (en) * 2018-02-28 2019-09-04 Garrett Transportation I Inc. Turbocharger compressor having adjustable-trim mechanism including vortex reducers
CN110219822A (zh) * 2018-03-01 2019-09-10 盖瑞特交通一公司 具有包括涡流导风轮的可调调整机构的涡轮增压器压缩机
US11680582B2 (en) * 2017-09-25 2023-06-20 Johnson Controls Tyco IP Holdings LLP Two piece split scroll for centrifugal compressor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0893682A (ja) * 1994-09-22 1996-04-09 Kobe Steel Ltd 遠心圧縮機
JP5223642B2 (ja) * 2008-12-10 2013-06-26 株式会社Ｉｈｉ 遠心圧縮機

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE736207C (de) * 1939-02-03 1943-06-09 Ernst Beck Dr Ing Stufenlos regelbares Geblaese
GB727649A (en) * 1950-05-16 1955-04-06 Borg Warner Improvements in or relating to overspeed control for air turbine driven pump
US3160112A (en) * 1958-07-31 1964-12-08 Westinghouse Electric Corp Check valve and application thereof
US3289919A (en) * 1964-11-16 1966-12-06 Westinghouse Electric Corp Centrifugal gas compressors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE736207C (de) * 1939-02-03 1943-06-09 Ernst Beck Dr Ing Stufenlos regelbares Geblaese
GB727649A (en) * 1950-05-16 1955-04-06 Borg Warner Improvements in or relating to overspeed control for air turbine driven pump
US3160112A (en) * 1958-07-31 1964-12-08 Westinghouse Electric Corp Check valve and application thereof
US3289919A (en) * 1964-11-16 1966-12-06 Westinghouse Electric Corp Centrifugal gas compressors

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213307A (en) * 1978-11-13 1980-07-22 Westinghouse Electric Corp. Oil separation and return system for centrifugal refrigerant compressors
US4789300A (en) * 1983-06-16 1988-12-06 Rotoflow Corporation Variable flow turbine expanders
US4850796A (en) * 1988-05-25 1989-07-25 Sundstrand Corporation Centrifugal pump with splitter vane/shut-off valve system
US5224820A (en) * 1991-09-25 1993-07-06 Societe Nationale D'etude Et De Construction De Moteurs D'aviation Operating mechanism for variably settable blades of a turbomachine
US5408708A (en) * 1993-10-29 1995-04-25 Vico Products Manufacturing Co., Inc. Flow-control for a pump
US20050263199A1 (en) * 2002-11-26 2005-12-01 David Meheen Flow laminarizing device
US7089963B2 (en) 2002-11-26 2006-08-15 David Meheen Flow laminarizing device
WO2008036832A1 (en) * 2006-09-21 2008-03-27 Borg Warner Inc. Turbine housing with integrated ribs
US20090280006A1 (en) * 2006-09-21 2009-11-12 Borgwarner Inc. Turbine housing with integrated ribs
US9068499B2 (en) 2006-09-21 2015-06-30 Borg Warner Inc. Turbine housing with integrated ribs
DE102014101213A1 (de) * 2014-01-31 2015-08-06 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verdichteranordnung für einen Turbolader eines Kraftfahrzeuges
DE102014101213B4 (de) 2014-01-31 2022-06-09 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verdichteranordnung für einen Turbolader eines Kraftfahrzeuges
CN106104006A (zh) * 2014-03-31 2016-11-09 三菱重工业株式会社 离心压缩机、增压器及离心压缩机的制造方法
EP3128184A4 (en) * 2014-03-31 2017-08-16 Mitsubishi Heavy Industries, Ltd. Centrifugal compressor, supercharger, and method for manufacturing centrifugal compressor
CN106104006B (zh) * 2014-03-31 2019-06-18 三菱重工业株式会社 离心压缩机、增压器、离心压缩机的制造方法及消音器
CN105715360A (zh) * 2014-12-17 2016-06-29 霍尼韦尔国际公司 配平可调式离心压缩机和具有该压缩机的涡轮增压器
EP3043045A3 (en) * 2014-12-17 2016-11-02 Honeywell International Inc. Adjustable-trim centrifugal compressor, and turbocharger having same
US9708925B2 (en) 2014-12-17 2017-07-18 Honeywell International Inc. Adjustable-trim centrifugal compressor, and turbocharger having same
CN105715360B (zh) * 2014-12-17 2019-10-25 盖瑞特交通一公司 配平可调式离心压缩机和具有该压缩机的涡轮增压器
US11680582B2 (en) * 2017-09-25 2023-06-20 Johnson Controls Tyco IP Holdings LLP Two piece split scroll for centrifugal compressor
US12044249B2 (en) 2017-09-25 2024-07-23 Tyco Fire & Security Gmbh Two piece split scroll for centrifugal compressor
EP3534014A1 (en) * 2018-02-28 2019-09-04 Garrett Transportation I Inc. Turbocharger compressor having adjustable-trim mechanism including vortex reducers
CN110219822A (zh) * 2018-03-01 2019-09-10 盖瑞特交通一公司 具有包括涡流导风轮的可调调整机构的涡轮增压器压缩机

Also Published As

Publication number Publication date
JPS461736A (enrdf_load_stackoverflow) 1971-09-30
BE763359A (fr) 1971-08-24
GB1287867A (enrdf_load_stackoverflow) 1972-09-06
FR2079045A5 (enrdf_load_stackoverflow) 1971-11-05

Similar Documents

Publication Publication Date Title
US3635580A (en) Centrifugal refrigerant gas compressor capacity control
US3545890A (en) Regenerative compressor
US3362625A (en) Centrifugal gas compressor
US3362624A (en) Centrifugal gas compressor
US4378194A (en) Centrifugal compressor
US3289919A (en) Centrifugal gas compressors
US2101051A (en) Rotary fluid displacement device
CN105114327A (zh) 多级压缩机及具有其的制冷系统
US2101428A (en) Rotary fluid displacement device
US2205902A (en) Reversible fan
JPH1162894A (ja) 自由ロータ
US3319877A (en) Machines of the cross-flow type for inducing movement of fluid
US4902200A (en) Variable diffuser wall with ribbed vanes
CN110173445A (zh) 压缩机及空调系统
US2083447A (en) Centrifugal compressor
US2653754A (en) Axial flow fan regulator
US20060115358A1 (en) Centrifugal compressor
JP2020537077A (ja) 再循環構造を備える遠心圧縮機
US2490066A (en) Diffuser
US2474410A (en) Multistage compressor
US2817475A (en) Centrifugal compressor and method of controlling the same
US2193243A (en) Refrigerating apparatus
JP3342914B2 (ja) ターボ装置
US2819837A (en) Compressor
CN110678659B (zh) 螺旋桨式风扇以及制冷循环装置

Legal Events

Date Code Title Description
AS Assignment

Owner name: MCQUAY-PERFEX, INC., A CORP. OF MN, MINNESOTA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA;REEL/FRAME:003954/0610

Effective date: 19820204

Owner name: MCQUAY-PERFEX, INC., MINNEAPOLIS, MN A CORP. OF MN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA;REEL/FRAME:003954/0610

Effective date: 19820204

AS Assignment

Owner name: MCQUAY INC.

Free format text: CHANGE OF NAME;ASSIGNOR:MCQUAY-PREFEX INC.;REEL/FRAME:004190/0553

Effective date: 19830528

AS Assignment

Owner name: SNYDER GENERAL CORPORATION, STATELESS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MCQUAY INC.;REEL/FRAME:004607/0047

Effective date: 19860327

Owner name: SNYDER GENERAL CORPORATION

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MCQUAY INC.;REEL/FRAME:004607/0047

Effective date: 19860327

AS Assignment

Owner name: CITICORP INDUSTRIAL CREDIT, INC., 2700 DIAMOND SHA

Free format text: SECURITY INTEREST;ASSIGNOR:MCQUAY INC., A MN CORP.;REEL/FRAME:004690/0296

Effective date: 19841102

AS Assignment

Owner name: CITICORP INDUSTRIAL CREDIT INC.,TEXAS

Free format text: SECURITY INTEREST;ASSIGNOR:SNYDERGENERAL CORPORATION;REEL/FRAME:004765/0735

Effective date: 19870630

Owner name: CITICORP INDUSTRIAL CREDIT INC., 2700 DIAMOND SHAM

Free format text: SECURITY INTEREST;ASSIGNOR:SNYDERGENERAL CORPORATION;REEL/FRAME:004765/0735

Effective date: 19870630

AS Assignment

Owner name: CITICORP NORTH AMERICA, INC., NEW YORK

Free format text: SECURITY INTEREST;ASSIGNOR:SNYDERGENERAL CORPORATION, A MN CORP.;REEL/FRAME:005013/0592

Effective date: 19881117

AS Assignment

Owner name: MCQUAY INC., A CORP. OF MINNESOTA, MINNESOTA

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITICORP NORTH AMERICA, INC.;REEL/FRAME:005278/0013

Effective date: 19881117

Owner name: SNYDERGENERAL CORPORATION, A CORP. OF MINNESOTA, T

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITICORP NORTH AMERICA, INC.;REEL/FRAME:005278/0013

Effective date: 19881117

AS Assignment

Owner name: SNYDERGENERAL CORPORATION A CORP. OF DELAWARE

Free format text: RELEASE BY SECOND PARTY OF A SECURITY AGREEMENT RECORDED AT REEL 5013 FRAME 592.;ASSIGNOR:CITICORP NORTH AMERICA, INC. A CORP. OF DELAWARE;REEL/FRAME:006104/0270

Effective date: 19920326