CA1064560A - Tandem thrust bearing - Google Patents
Tandem thrust bearingInfo
- Publication number
- CA1064560A CA1064560A CA271,860A CA271860A CA1064560A CA 1064560 A CA1064560 A CA 1064560A CA 271860 A CA271860 A CA 271860A CA 1064560 A CA1064560 A CA 1064560A
- Authority
- CA
- Canada
- Prior art keywords
- thrust bearing
- thrust
- shaft
- tandem
- bearing means
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/26—Systems consisting of a plurality of sliding-contact bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
- F16C41/02—Arrangements for equalising the load on a plurality of bearings or their elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/30—Application independent of particular apparatuses related to direction with respect to gravity
- F16C2300/34—Vertical, e.g. bearings for supporting a vertical shaft
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Support Of The Bearing (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
ABSTRACT
A tandem thrust bearing arrangement comprising a housing having a substantially vertical shaft journaled therein, which shaft has a load thereon, and independently mounted lower and upper thrust bearing means associated with the shaft. The lower thrust bearing means carries predetermined first portions of the imposed load while the upper thrust bearing means carries thrust loads in excess of the first part thereof, permitting full loading of the shaft in a limited spacial relationship.
A tandem thrust bearing arrangement comprising a housing having a substantially vertical shaft journaled therein, which shaft has a load thereon, and independently mounted lower and upper thrust bearing means associated with the shaft. The lower thrust bearing means carries predetermined first portions of the imposed load while the upper thrust bearing means carries thrust loads in excess of the first part thereof, permitting full loading of the shaft in a limited spacial relationship.
Description
:L0~5~
The use of -thrus-t bearings to carry the imposed load on a subs-tantially vertical shaft is well known in the art. As imposed loads on the shc~lft are increased, it becomes necessary to cons-truct laryer thrust bearings, which require more space. Thus, housings in which ,the shaf-t is journaled must be larger in diameter to house the shaft-thrust bearing assembly.
According to the present invention, there is prov,ided a tandem thrust bearing arrangement ~hich has a housing means and a substantially ver-tical shaft journaled for rotation in the housing means with a load imposed thereon.
Independently mounted lower and upper thrust bearing means are operatively associated with the shaft, the lower thrust bearing means being so constructed and arranged to carry a first part of the imposed load and the upper thrust bearing means being so constructed and arranged -to carry imposed load in excess of the first part thereo~. The lowex and ., . . . :
,, upper thrust bearing means permitting full loading of the '' shaft in a limited spacial relationship.' ~ It may be seen tha-t the present invention relates ~ to a compact, tandem mounted thrust bearing means, so 1 arranged and construc-ted that the lower thrust bearing mea,ns carries a predetermined amount of imposecl thrust and the ~ upper thrust bearing means carries the excess of the imposed ~' ' ,,~ thrust load. The predetermined load capacity of the lower ;~ thrust~bearing means is no more than its rated load carrying capacity; the remainder is carried by -th~ upper ~ thrust beariny means.
', The arrangement provides essentially the same load carrying capacity of a larger thrust bearing assembly without requiring the increase in housing size required to ; ~ house such a larger thrust bearing assembly. ~ compact, .~', :
~ sb/\l~
- , , : ~ , . . .. .. : .
tandem thrust bearing assembly of this invention c~n -thus be used for limited space application yet carries loads in excess of a single bearing housecl in a like housing.
,....
.:
. , ~ , ~
, . '~
. . .
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. . ~
- la -sb/ ~
. ~ . . . . . ... . . . ... . . .. . . . .. . . .
~ 075166-CL
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In the accompanyin.g d~awings:
. FIGliRE :L is a partial, sectional view of a typical tandem thrust bearing arrangemellt incorpora-ting a lower and an upper thrust hearing means, constructed . accordiny to thls inventlo:n, and '::
FIGVRE 2 is a partial, sectional v.iew oE the lower thrust bearing means wherein shims are used for . adjustment purposes~
, ~ Lookiny now at FIGURE 1 of the drawings, there is illustrated a tandem thrust bearing arrangement con-structed according to this invention which comprises a substantially vertical shaft 10 journaled -Eor rotation in a multiple-part housing 12 by spaced journals 14 and 16.
:` : Within the ~rrangement are lower and upper thrust bear.ing .
, means 18 and 20, respectively.
., The lower thrust bearing means 18 compr;.ses an am~ular bearing shoe 22 keyed or otherwise connected to :.
the housing 12 having a bearing face 24 for contact with an annular thrust bearing pad 26 received ln a recess 28 in an annular th:rust runner 30 which surrounds and .is vertically slida~le relative to the shaft 10~ An annular lock ring 32 surrounding the shaft 10 is bolted by bol-ts 34 tQ the thru~t ru:nner 30~ The lock ring 32 is formed with a recess 36 which, with the top of the thrust runner 30, forms an annular cavity 3B and also, the lock ring i5 formed with: an annular recess 40 to receive a split loc}c xing 42 .~ ~
j,: ~ ~, . . .
. ~ . .
. 075166-CI:, ~ .
partially received in a lock ring groove 44 in the sha.F-t 10.
A spring washer or a Belleville spring 46 is received in the cavity 38 with its inner periphery bearing acJai.nst the lock ring 42. The spring Eorce ~Erom the Belleville spring 46) acting on the thrust runner 30 is adjusted b~ the pos.i-tion of the lock ring 32. If necessary/ shims 31, as illustrated in FIGURE 2~ may be placed between the lock ring 32 and the thrust runner 30 for adjusting the spring force.
~ he upper thrust bearing means 20 comprises an annular bearing shoe 52 keyed or otherwise connected to the housing 12 having a bearing face 54 for contact with an annular thrust bearing pad 56 received in a recess in an annular thrust runner 58 which surrounds the shaft 10.
The -thrust runner 58 is coupled for vertical movement with the shaft 10 by mean; of lower and upper snap rings 60 and 62, respectively, -the upper snap ring fitting in a groove 64 in the shaft 10 and in an annular recess 66 in the runner 58 while the lower snap ring its in a . -groove 68 in the shaft 10.
In the struc-ture described, the lower thrust ~: .
~bearing means 18 carries a first part of the thrust from the shaft up to but not mo.re than its rated limit, as determined by the p:reloading of the Belleville spring.
Tha spli t ring 68 of the upper thrust bearing means 20 is so positloned:that the runner 58 will '~stand-off" the pad 56 by~the amount of available travel of the lower ~:
thrust runner 32. When the lower thrust bearing means . .::
18~is fully loaded to its capacity, as determ.ined by the ~ . , ~ ~3-075166-CL.
loading o~ the Belleville spring, the upper thrust hearing means 20 wil.l then become operative -to carry a second par-t of the thrus-k load.
The arrangement descr.ibed resulks in a relatively small thrust bearing arran~ement adaptable ~or use in a limited spacial relationship~
.
I-t is to be understood that the arrangement described is~.for illustrative purposes only; the tandem arrangement can comprise more than two thrust bearing means, i.e., three or more, as is required, .
:
, ~:
:: :
::: :
:
.
.
The use of -thrus-t bearings to carry the imposed load on a subs-tantially vertical shaft is well known in the art. As imposed loads on the shc~lft are increased, it becomes necessary to cons-truct laryer thrust bearings, which require more space. Thus, housings in which ,the shaf-t is journaled must be larger in diameter to house the shaft-thrust bearing assembly.
According to the present invention, there is prov,ided a tandem thrust bearing arrangement ~hich has a housing means and a substantially ver-tical shaft journaled for rotation in the housing means with a load imposed thereon.
Independently mounted lower and upper thrust bearing means are operatively associated with the shaft, the lower thrust bearing means being so constructed and arranged to carry a first part of the imposed load and the upper thrust bearing means being so constructed and arranged -to carry imposed load in excess of the first part thereo~. The lowex and ., . . . :
,, upper thrust bearing means permitting full loading of the '' shaft in a limited spacial relationship.' ~ It may be seen tha-t the present invention relates ~ to a compact, tandem mounted thrust bearing means, so 1 arranged and construc-ted that the lower thrust bearing mea,ns carries a predetermined amount of imposecl thrust and the ~ upper thrust bearing means carries the excess of the imposed ~' ' ,,~ thrust load. The predetermined load capacity of the lower ;~ thrust~bearing means is no more than its rated load carrying capacity; the remainder is carried by -th~ upper ~ thrust beariny means.
', The arrangement provides essentially the same load carrying capacity of a larger thrust bearing assembly without requiring the increase in housing size required to ; ~ house such a larger thrust bearing assembly. ~ compact, .~', :
~ sb/\l~
- , , : ~ , . . .. .. : .
tandem thrust bearing assembly of this invention c~n -thus be used for limited space application yet carries loads in excess of a single bearing housecl in a like housing.
,....
.:
. , ~ , ~
, . '~
. . .
'"
...
, .
,,i .
. . ~
- la -sb/ ~
. ~ . . . . . ... . . . ... . . .. . . . .. . . .
~ 075166-CL
~6~
In the accompanyin.g d~awings:
. FIGliRE :L is a partial, sectional view of a typical tandem thrust bearing arrangemellt incorpora-ting a lower and an upper thrust hearing means, constructed . accordiny to thls inventlo:n, and '::
FIGVRE 2 is a partial, sectional v.iew oE the lower thrust bearing means wherein shims are used for . adjustment purposes~
, ~ Lookiny now at FIGURE 1 of the drawings, there is illustrated a tandem thrust bearing arrangement con-structed according to this invention which comprises a substantially vertical shaft 10 journaled -Eor rotation in a multiple-part housing 12 by spaced journals 14 and 16.
:` : Within the ~rrangement are lower and upper thrust bear.ing .
, means 18 and 20, respectively.
., The lower thrust bearing means 18 compr;.ses an am~ular bearing shoe 22 keyed or otherwise connected to :.
the housing 12 having a bearing face 24 for contact with an annular thrust bearing pad 26 received ln a recess 28 in an annular th:rust runner 30 which surrounds and .is vertically slida~le relative to the shaft 10~ An annular lock ring 32 surrounding the shaft 10 is bolted by bol-ts 34 tQ the thru~t ru:nner 30~ The lock ring 32 is formed with a recess 36 which, with the top of the thrust runner 30, forms an annular cavity 3B and also, the lock ring i5 formed with: an annular recess 40 to receive a split loc}c xing 42 .~ ~
j,: ~ ~, . . .
. ~ . .
. 075166-CI:, ~ .
partially received in a lock ring groove 44 in the sha.F-t 10.
A spring washer or a Belleville spring 46 is received in the cavity 38 with its inner periphery bearing acJai.nst the lock ring 42. The spring Eorce ~Erom the Belleville spring 46) acting on the thrust runner 30 is adjusted b~ the pos.i-tion of the lock ring 32. If necessary/ shims 31, as illustrated in FIGURE 2~ may be placed between the lock ring 32 and the thrust runner 30 for adjusting the spring force.
~ he upper thrust bearing means 20 comprises an annular bearing shoe 52 keyed or otherwise connected to the housing 12 having a bearing face 54 for contact with an annular thrust bearing pad 56 received in a recess in an annular thrust runner 58 which surrounds the shaft 10.
The -thrust runner 58 is coupled for vertical movement with the shaft 10 by mean; of lower and upper snap rings 60 and 62, respectively, -the upper snap ring fitting in a groove 64 in the shaft 10 and in an annular recess 66 in the runner 58 while the lower snap ring its in a . -groove 68 in the shaft 10.
In the struc-ture described, the lower thrust ~: .
~bearing means 18 carries a first part of the thrust from the shaft up to but not mo.re than its rated limit, as determined by the p:reloading of the Belleville spring.
Tha spli t ring 68 of the upper thrust bearing means 20 is so positloned:that the runner 58 will '~stand-off" the pad 56 by~the amount of available travel of the lower ~:
thrust runner 32. When the lower thrust bearing means . .::
18~is fully loaded to its capacity, as determ.ined by the ~ . , ~ ~3-075166-CL.
loading o~ the Belleville spring, the upper thrust hearing means 20 wil.l then become operative -to carry a second par-t of the thrus-k load.
The arrangement descr.ibed resulks in a relatively small thrust bearing arran~ement adaptable ~or use in a limited spacial relationship~
.
I-t is to be understood that the arrangement described is~.for illustrative purposes only; the tandem arrangement can comprise more than two thrust bearing means, i.e., three or more, as is required, .
:
, ~:
:: :
::: :
:
.
.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A tandem thrust bearing arrangement comprising:
a housing means;
a substantially vertical shaft journaled for rotation in said housing means and having a load imposed thereon;
independently mounted lower and upper thrust bearing means operatively associated with said shaft;
said lower thrust bearing means being so constructed and arranged to carry a first part of said imposed load;
said upper thrust bearing means being so constructed and arranged to carry imposed load in excess of said first part thereof;
said lower and upper thrust bearing means permitting full loading of said shaft in a limited spacial relationship.
a housing means;
a substantially vertical shaft journaled for rotation in said housing means and having a load imposed thereon;
independently mounted lower and upper thrust bearing means operatively associated with said shaft;
said lower thrust bearing means being so constructed and arranged to carry a first part of said imposed load;
said upper thrust bearing means being so constructed and arranged to carry imposed load in excess of said first part thereof;
said lower and upper thrust bearing means permitting full loading of said shaft in a limited spacial relationship.
2. A tandem thrust bearing arrangement as recited in claim 1 further comprising means for adjusting the allowable load carried by said lower thrust bearing means.
3. A tandem thrust bearing arrangement as recited in claim 2 wherein said adjusting means comprises a Belleville spring.
4. A tandem thrust bearing arrangement as recited in claim 1 in which said lower thrust bearing means comprises a thrust runner surrounding said shaft and a lock ring adjustably connected to said thrust runner, a Belleville spring between said thrust runner and said lock ring, a ring on said shaft engaging said spring, the loading of said spring being adjustable by said adjustable connection between said thrust runner and said lock ring and thus adjusting the allowable load carried by said lower thrust bearing means.
5. A tandem thrust bearing arrangement as recited in claim 1 wherein said upper thrust bearing means comprises a thrust runner and a thrust bearing pad, means support-ing said upper thrust runner at a position off the upper thrust pad until said lower thrust bearing means carries said first part of said load.
6. A tandem thrust bearing arrangement as recited in claim 5 wherein said supporting means comprises a ring carried by said shaft.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/663,650 US4033647A (en) | 1976-03-04 | 1976-03-04 | Tandem thrust bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1064560A true CA1064560A (en) | 1979-10-16 |
Family
ID=24662738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA271,860A Expired CA1064560A (en) | 1976-03-04 | 1977-02-15 | Tandem thrust bearing |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4033647A (en) |
| AR (1) | AR213428A1 (en) |
| CA (1) | CA1064560A (en) |
| DE (1) | DE2709102A1 (en) |
| NL (1) | NL7702122A (en) |
Families Citing this family (39)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4596475A (en) * | 1977-09-20 | 1986-06-24 | Pannwitz Hans U | Thrust bearing |
| US4275938A (en) * | 1979-11-21 | 1981-06-30 | Centrilift-Hughes, Inc. | Tandem thrust bearing |
| US4402618A (en) * | 1981-02-02 | 1983-09-06 | United Technologies Corporation | High speed rotary machine bearing mount structure |
| US4363608A (en) * | 1981-04-20 | 1982-12-14 | Borg-Warner Corporation | Thrust bearing arrangement |
| JPS61150630A (en) * | 1984-12-25 | 1986-07-09 | Ebara Corp | Underwater motor |
| CH674060A5 (en) * | 1987-01-26 | 1990-04-30 | Maag Zahnraeder & Maschinen Ag | |
| US5667314A (en) * | 1995-12-12 | 1997-09-16 | Baker Hughes Incorporated | Horizontal thrust bearing assembly |
| US5660520A (en) * | 1996-01-25 | 1997-08-26 | Camco International Inc. | Downhole centrifugal pump |
| US5741116A (en) * | 1996-12-18 | 1998-04-21 | Delaware Capital Formation Inc. | Compressor thrust bearings |
| US6485181B2 (en) | 2001-01-17 | 2002-11-26 | Delaware Capital Formation, Inc. | Thrust bearing assembly |
| US8075668B2 (en) * | 2005-03-29 | 2011-12-13 | Dresser-Rand Company | Drainage system for compressor separators |
| US8434998B2 (en) | 2006-09-19 | 2013-05-07 | Dresser-Rand Company | Rotary separator drum seal |
| BRPI0718513B1 (en) * | 2006-09-21 | 2018-10-23 | Dresser Rand Co | fluid handling set for a fluid machine |
| US8231336B2 (en) * | 2006-09-25 | 2012-07-31 | Dresser-Rand Company | Fluid deflector for fluid separator devices |
| US8267437B2 (en) * | 2006-09-25 | 2012-09-18 | Dresser-Rand Company | Access cover for pressurized connector spool |
| EP2066983B1 (en) * | 2006-09-25 | 2013-12-11 | Dresser-Rand Company | Compressor mounting system |
| EP2066988A4 (en) * | 2006-09-25 | 2012-01-04 | Dresser Rand Co | Coupling guard system |
| US8079622B2 (en) * | 2006-09-25 | 2011-12-20 | Dresser-Rand Company | Axially moveable spool connector |
| EP2066422B1 (en) * | 2006-09-26 | 2012-06-27 | Dresser-Rand Company | Improved static fluid separator device |
| BRPI0908051A2 (en) * | 2008-03-05 | 2015-08-11 | Dresser Rand Co | Compressor set including separator and ejector pump |
| US8079805B2 (en) * | 2008-06-25 | 2011-12-20 | Dresser-Rand Company | Rotary separator and shaft coupler for compressors |
| US8062400B2 (en) * | 2008-06-25 | 2011-11-22 | Dresser-Rand Company | Dual body drum for rotary separators |
| US7922218B2 (en) * | 2008-06-25 | 2011-04-12 | Dresser-Rand Company | Shear ring casing coupler device |
| US7987913B2 (en) | 2008-09-26 | 2011-08-02 | Baker Hughes Incorporated | Electrical submersible pump with equally loaded thrust bearings and method of pumping subterranean fluid |
| US8087901B2 (en) * | 2009-03-20 | 2012-01-03 | Dresser-Rand Company | Fluid channeling device for back-to-back compressors |
| US8210804B2 (en) * | 2009-03-20 | 2012-07-03 | Dresser-Rand Company | Slidable cover for casing access port |
| US8061972B2 (en) * | 2009-03-24 | 2011-11-22 | Dresser-Rand Company | High pressure casing access cover |
| WO2011034764A2 (en) * | 2009-09-15 | 2011-03-24 | Dresser-Rand Company | Improved density-based compact separator |
| WO2011100158A2 (en) | 2010-02-10 | 2011-08-18 | Dresser-Rand Company | Separator fluid collector and method |
| WO2012009159A2 (en) | 2010-07-15 | 2012-01-19 | Dresser-Rand Company | Radial vane pack for rotary separators |
| WO2012009158A2 (en) | 2010-07-15 | 2012-01-19 | Dresser-Rand Company | Enhanced in-line rotary separator |
| WO2012012018A2 (en) | 2010-07-20 | 2012-01-26 | Dresser-Rand Company | Combination of expansion and cooling to enhance separation |
| US8821362B2 (en) | 2010-07-21 | 2014-09-02 | Dresser-Rand Company | Multiple modular in-line rotary separator bundle |
| JP5936144B2 (en) | 2010-09-09 | 2016-06-15 | ドレッサー ランド カンパニーＤｒｅｓｓｅｒ−Ｒａｎｄ Ｃｏｍｐａｎｙ | Drain pipe controlled to be washable |
| US8342821B2 (en) | 2010-10-21 | 2013-01-01 | Baker Hughes Incorporated | Tuned bearing |
| US10151341B2 (en) | 2015-08-27 | 2018-12-11 | General Electric Company | Load-limiting thrust bearing system and an associated method thereof |
| US9856910B2 (en) | 2015-11-30 | 2018-01-02 | Roller Bearing Company Of America, Inc. | Self-lubricated thrust bearing for a hinged aircraft wing |
| US10107079B1 (en) * | 2017-10-25 | 2018-10-23 | Summit Esp, Llc | Electric submersible motor thrust bearing system |
| MX2020003249A (en) * | 2017-10-25 | 2020-09-18 | Halliburton Energy Services Inc | Electric submersible motor thrust bearing system. |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US433143A (en) * | 1890-07-29 | End thrust bearing | ||
| US5003A (en) * | 1847-03-06 | philip c | ||
| US2772373A (en) * | 1955-04-18 | 1956-11-27 | Borg Warner | Motor thrust load balancing means |
| US3158415A (en) * | 1963-06-06 | 1964-11-24 | Waukesha Bearings Corp | Equalizing arrangements for tandrm thrust bearings |
| US3276742A (en) * | 1963-11-05 | 1966-10-04 | Hitachi Ltd | Vertical shaft kaplan water turbines |
-
1976
- 1976-03-04 US US05/663,650 patent/US4033647A/en not_active Expired - Lifetime
-
1977
- 1977-02-15 CA CA271,860A patent/CA1064560A/en not_active Expired
- 1977-02-28 NL NL7702122A patent/NL7702122A/en not_active Application Discontinuation
- 1977-03-01 AR AR266727A patent/AR213428A1/en active
- 1977-03-02 DE DE19772709102 patent/DE2709102A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US4033647A (en) | 1977-07-05 |
| NL7702122A (en) | 1977-09-06 |
| AR213428A1 (en) | 1979-01-31 |
| DE2709102A1 (en) | 1977-09-08 |
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