CA2091482A1 - Anti-rotation ring for a scroll machine - Google Patents
Anti-rotation ring for a scroll machineInfo
- Publication number
- CA2091482A1 CA2091482A1 CA002091482A CA2091482A CA2091482A1 CA 2091482 A1 CA2091482 A1 CA 2091482A1 CA 002091482 A CA002091482 A CA 002091482A CA 2091482 A CA2091482 A CA 2091482A CA 2091482 A1 CA2091482 A1 CA 2091482A1
- Authority
- CA
- Canada
- Prior art keywords
- hub
- orbiting scroll
- base member
- compressor
- frame
- 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.)
- Abandoned
Links
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 4
- 238000007142 ring opening reaction Methods 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Rotary Pumps (AREA)
Abstract
ABSTRACT An anti-rotation device for a hermetic scroll type compressor, including a ring member with an opening having two parallel sides and one pair of axially aligned tabs. An interfitting orbiting scroll hub having two opposing flats slides within the oldham ring opening with the orbiting hub flats sliding against and rectilinearly with parallel sides of the opening. Ring member tabs slide in a pair of grooves on the compressor frame perpendicular to the direction of sliding of the orbiting scroll hub.
Description
~0!~ 2 ANTI-ROTATION RING FOR A SCROLL MACHINE
The present invention relates generally to a hermetic scroll type compressor and, more particularly, such a compressor having an anti-rotation coupling such as in the form of an Oldham ring.
A typical scroll compressor comprises two facing scroll members, each having an involute wrap, wherein the respective wraps interfit to define a plurality of closed compression pockets.
When one of the scroll members is orbiting relative to the other, the pockets decrease in volume as they travel between a radially outer suction port and a radially inner discharge port, thereby conveying and compressing the refrigerant fluid.
If one involute element were free to rotate with respect to the other, the fluid pocket would leak and the intermeshed involutes would bind together. Therefore to prevent this it is necessary to have an anti-rotation coupling that maintains a fixed annular relationship between the involutes yet still allows one scroll to orbit in relation to the other scroll.
- 25 Designs for such couplings are well known in the prior art. For example, U.S. Patent No.
- 4,655,698 discloses a "Oldham ring" comprising an annular ring with four sliding keys disposed at 90 intervals around its perimeter. Two of the keys at opposite sides of the ring engage slots in the orbiting element while the other two engage slots in the stationary portion of the machine.
Another U.S. Patent, No. 4,767,293 discloses an oval Oldham ring which includes two pairs of tabs which slide in corresponding grooves in a thrust plate and orbiting scroll plate.
, .
, .
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A present problem with manufacturing prior art Oldham rings includes the requirement for maintaining perpendicular tolerances between the tabs on the ring. Also, prior art Oldham rings are large in size, increasing inertial force and adding to the cost of the compressor.
It is an object of the present invention to obviate or r,litigate the aforementioned prior art problems associated with Oldham ringsO
The present invention overcomes the disadvantages of the above described prior art scroll type compressors by providing an improved anti-rotation mechanism, capable of accurately permitting the orbiting scroll and fixed scrolls to orbit relative one another.
Generally, the invention provides an anti-rotation device for use between an orbiting scroll hub and a compressor frame or thrust surface.
This new anti-rotation device, in one form thereof, includes one pair of tabs that slide rectilinearly with respect to the frame or thrust surface. An opening in the Oldham ring is created with two parallel sides, into which the orbiting scroll hub interfits and slides. The orbiting scroll hub has two opposing flats that slide against the parallel sides of the ring opening thus preventing the orbiting scroll from rotating within the Oldham ring. The tabs on the Oldham ring prevent the ring from rotating relative the frame.
In one form of the invention, the Oldham ring is produced with a pair of grooves as opposed to tabs, wherein the frame includes tabs that interfit and slide within the Oldham ring grooves 2 ~
thereby also preventing the ring from rotating relative the frame.
An advantage of the anti-rotation device of the present invention, according to one form thereof, is tha~ of creating an anti-rotation device where the requirement of perpendicularity between the keying means and the opening side walls are easily maintained.
Another advantage of the anti-rotation device of the present invention is that of creating a smaller Oldham ring with less material and fewer tabs.
Yet another advantage of the anti-rotation - means of the present invention is that of preventing rotation between the orbiting and fixed scroll involutes thereby allowing maximum compressor efficiency.
The invention, in one form thereof, provides a hermetic scroll compressor for use in compressing refrigerant. The compressor includes a housing with a frame therein. An orbiting scroll and stationary scroll are disposed within the housing and interfit to create at least one compression pocket for compressing fluid. The -` 25 orbiting scroll includes a hub which interfits and slides rectilinearly without rotating within an ; opening in an anti-rotational device disposed between the orbiting scroll and frame. The anti-rotational device includes a base member having keying means for slidably interengaging a complimentary keying means on the frame.
In one aspect of the previously described form of the invention, the base member keying means includes a pair of axially extending tabs while the complimentary keying means includes a ., , , 2~ 7 pair of grooves in the frame in which the base member keying means moves rectilinearly.
In accord with another aspect of the invention, the base member keying means includes a pair of grooves while the complimentary keying means includes a pair of axially extending tabs from the frame on which the base member keying - means linearly slides.
The above mentioned and other features and objects of this invention, and the manner of attaining them, will become more apparent and the invention itself will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:
Fig. 1 is a fragmentary sectional view of a compressor incorporating the present invention;
Fig. 2 is a sectional view similar to Fig. 1 but with the alternate keying means of the present invention;
Fig. 3 is a top plan view of the anti-rotation device of the present invention;
Fig. 4 is a side view of the anti-rotation device of the present invention;
Fig. 5 is a top plan view of an alternative embodiment of the present invention; and Fig. 6 is a side view of the alternative embodiment of the present invention.
Corresponding reference characters indicate corresponding parts throughout the several views.
The~ exemplifications set out herein illustrate a preferred embodiment of the invention, in one form thereof, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
2~91~
Referring now to FIGS. 1 and 2, there is shown a compressor 10 having a housing generally designated at 12. The housing has a top cover plate 14, a central portion 16, and a bottom portion (not shown), wherein central portion 16 and bottom portion may alternatively comprise a unitary shell member. The three housing portions are hermetically secured together as by welding or brazing.
Located within hermetically sealed housing 12 ~ is a drive means such as an electric motor - generally designated at 22, having a stator 24 and ; a rotor 26. Stator 24 is provided with windings 28. Rotor 26 has a central aperture 30 provided therein into which is secured a crankshaft 32 by an interference fit. A terminal cluster 34 is provided in housing 12 for connecting motor 22 to a source of electric power.
A scroll compressor mechanism 46 is enclosed within housing 12, and generally comprises a fixed or stationary scroll member assembly 48 and an orbiting scroll member assembly 50, which are oriented axially relative a main bearing frame member 52. An example of a scroll compressor is described in U.S. Patent 5,013,225 assigned to the owner of the present invention and explicitly incorporated herein.
Fixed scroll assembly 48 comprises a generally flat scroll member 54, having an involute wrap 56 thereon. Fixed scroll member 54 is attached to frame member 52 by means of pins or bolts 58.
Referring to Fig. 1, orbiting scroll assembly 50 comprises a generally flat orbiting scroll plate 60, having an involute wrap 62 thereon, and a bottom hub 64. As shown in Figs. 3 and 5, 2091~2 bottom hub 64 has two flats 66 on opposite sides of hub 64.
Crankshaft 32 connects to orbiting scroll plate 60 by means of a crank mechanism 68 such as a swing link connection. An eccentric crankpin 70 attached to the top of crankshaft 32 is disposed in an eccentric hole 72 in roller 74. Roller 74 is disposed within a bore 76 in orbiting hub 64 to translate the rotation of crankshaft 32 into orbiting motion for orbiting scroll assembly 50.
Scroll mechanism 46 is assembled such that orbiting scroll wrap 56 interfits with fixed scroll wrap 62 to permit compression of - refrigerant when orbiting scroll assembly 50 is orbited relative to fixed scroll assembly 48.
Orbiting scroll assembly 50 is prevented from rotating about its own axis by means of the anti rotation device 78 of the present invention.
Fig. 3 shows the anti-rotation device or Oldham ring 78 having a base member 80. Base member 80 is generally oval shaped having an opening 82 into which orbiting scroll hub 64 interfits. The unique feature of opening 82 is that it includes two straight, parallel sidewalls 86 that orbiting scroll hub 64 slides against.
More specifically, orbiting hub flats 66 slide against parallel sidewalls 86 rectilinearly, thereby preventing orbiting scroll hub 64 and orbiting scroll plate 66 from rotating within opening 82.
Base member 80 also includes keying means 88 that slidable engage a complimentary keying means 90 on frame 52. Keying means 88 may comprise axially extending tabs as shown in Fig. 4. Keying ` 3S means 88 are in a line substantially perpendicularly to parallel sidewalls 86.
. ~
2~91~2 In the preferred embodiment, keying means 88 are a pair of axially extending tabs as shown in Fig. 4, while complementary k~eying means 90 comprises a pair of grooves 94 on frame 52 into which keying means 88 moves rectilinearly. The direction anti-rotation device 78 slides in relation to orbiting hub 54 is substantially perpendicular to the direction of sliding between anti-rotation device 78 and frame 52.
The new Oldham ring 78 is smaller and lighter than prior art Oldham rings lowering the inertial forces while perpendicular tolerances are easier to maintain between sidewalls 86 of opening 82 and keying means 88.
Alternatively, the Oldham ring may be constructed with different keying means as is shown in Figs. 5 and 6. Base member 180 includes keying means that slidable engage a complimentary keying means on frame 52. Keying means comprise grooves 92 in base member 180 as shown in Fig. 6.
Complimentary keying means on frame 52 includes axially extending tabs 96 as shown in Figs. 2 and 6. Tabs 96 slide within grooves 92 during compressor operation preventing the Oldham ring from rotating relative frame 52. The orbiting hub 64 is prevented from rotation as discussed in the previous embodiment.
While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further~ this application is intended to cover such departures from the present disclosure as come within known or customary 20~8~
practice in the art to which lhis invention pertains and which fall within the limits of the appended claims.
The present invention relates generally to a hermetic scroll type compressor and, more particularly, such a compressor having an anti-rotation coupling such as in the form of an Oldham ring.
A typical scroll compressor comprises two facing scroll members, each having an involute wrap, wherein the respective wraps interfit to define a plurality of closed compression pockets.
When one of the scroll members is orbiting relative to the other, the pockets decrease in volume as they travel between a radially outer suction port and a radially inner discharge port, thereby conveying and compressing the refrigerant fluid.
If one involute element were free to rotate with respect to the other, the fluid pocket would leak and the intermeshed involutes would bind together. Therefore to prevent this it is necessary to have an anti-rotation coupling that maintains a fixed annular relationship between the involutes yet still allows one scroll to orbit in relation to the other scroll.
- 25 Designs for such couplings are well known in the prior art. For example, U.S. Patent No.
- 4,655,698 discloses a "Oldham ring" comprising an annular ring with four sliding keys disposed at 90 intervals around its perimeter. Two of the keys at opposite sides of the ring engage slots in the orbiting element while the other two engage slots in the stationary portion of the machine.
Another U.S. Patent, No. 4,767,293 discloses an oval Oldham ring which includes two pairs of tabs which slide in corresponding grooves in a thrust plate and orbiting scroll plate.
, .
, .
g ~
A present problem with manufacturing prior art Oldham rings includes the requirement for maintaining perpendicular tolerances between the tabs on the ring. Also, prior art Oldham rings are large in size, increasing inertial force and adding to the cost of the compressor.
It is an object of the present invention to obviate or r,litigate the aforementioned prior art problems associated with Oldham ringsO
The present invention overcomes the disadvantages of the above described prior art scroll type compressors by providing an improved anti-rotation mechanism, capable of accurately permitting the orbiting scroll and fixed scrolls to orbit relative one another.
Generally, the invention provides an anti-rotation device for use between an orbiting scroll hub and a compressor frame or thrust surface.
This new anti-rotation device, in one form thereof, includes one pair of tabs that slide rectilinearly with respect to the frame or thrust surface. An opening in the Oldham ring is created with two parallel sides, into which the orbiting scroll hub interfits and slides. The orbiting scroll hub has two opposing flats that slide against the parallel sides of the ring opening thus preventing the orbiting scroll from rotating within the Oldham ring. The tabs on the Oldham ring prevent the ring from rotating relative the frame.
In one form of the invention, the Oldham ring is produced with a pair of grooves as opposed to tabs, wherein the frame includes tabs that interfit and slide within the Oldham ring grooves 2 ~
thereby also preventing the ring from rotating relative the frame.
An advantage of the anti-rotation device of the present invention, according to one form thereof, is tha~ of creating an anti-rotation device where the requirement of perpendicularity between the keying means and the opening side walls are easily maintained.
Another advantage of the anti-rotation device of the present invention is that of creating a smaller Oldham ring with less material and fewer tabs.
Yet another advantage of the anti-rotation - means of the present invention is that of preventing rotation between the orbiting and fixed scroll involutes thereby allowing maximum compressor efficiency.
The invention, in one form thereof, provides a hermetic scroll compressor for use in compressing refrigerant. The compressor includes a housing with a frame therein. An orbiting scroll and stationary scroll are disposed within the housing and interfit to create at least one compression pocket for compressing fluid. The -` 25 orbiting scroll includes a hub which interfits and slides rectilinearly without rotating within an ; opening in an anti-rotational device disposed between the orbiting scroll and frame. The anti-rotational device includes a base member having keying means for slidably interengaging a complimentary keying means on the frame.
In one aspect of the previously described form of the invention, the base member keying means includes a pair of axially extending tabs while the complimentary keying means includes a ., , , 2~ 7 pair of grooves in the frame in which the base member keying means moves rectilinearly.
In accord with another aspect of the invention, the base member keying means includes a pair of grooves while the complimentary keying means includes a pair of axially extending tabs from the frame on which the base member keying - means linearly slides.
The above mentioned and other features and objects of this invention, and the manner of attaining them, will become more apparent and the invention itself will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:
Fig. 1 is a fragmentary sectional view of a compressor incorporating the present invention;
Fig. 2 is a sectional view similar to Fig. 1 but with the alternate keying means of the present invention;
Fig. 3 is a top plan view of the anti-rotation device of the present invention;
Fig. 4 is a side view of the anti-rotation device of the present invention;
Fig. 5 is a top plan view of an alternative embodiment of the present invention; and Fig. 6 is a side view of the alternative embodiment of the present invention.
Corresponding reference characters indicate corresponding parts throughout the several views.
The~ exemplifications set out herein illustrate a preferred embodiment of the invention, in one form thereof, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
2~91~
Referring now to FIGS. 1 and 2, there is shown a compressor 10 having a housing generally designated at 12. The housing has a top cover plate 14, a central portion 16, and a bottom portion (not shown), wherein central portion 16 and bottom portion may alternatively comprise a unitary shell member. The three housing portions are hermetically secured together as by welding or brazing.
Located within hermetically sealed housing 12 ~ is a drive means such as an electric motor - generally designated at 22, having a stator 24 and ; a rotor 26. Stator 24 is provided with windings 28. Rotor 26 has a central aperture 30 provided therein into which is secured a crankshaft 32 by an interference fit. A terminal cluster 34 is provided in housing 12 for connecting motor 22 to a source of electric power.
A scroll compressor mechanism 46 is enclosed within housing 12, and generally comprises a fixed or stationary scroll member assembly 48 and an orbiting scroll member assembly 50, which are oriented axially relative a main bearing frame member 52. An example of a scroll compressor is described in U.S. Patent 5,013,225 assigned to the owner of the present invention and explicitly incorporated herein.
Fixed scroll assembly 48 comprises a generally flat scroll member 54, having an involute wrap 56 thereon. Fixed scroll member 54 is attached to frame member 52 by means of pins or bolts 58.
Referring to Fig. 1, orbiting scroll assembly 50 comprises a generally flat orbiting scroll plate 60, having an involute wrap 62 thereon, and a bottom hub 64. As shown in Figs. 3 and 5, 2091~2 bottom hub 64 has two flats 66 on opposite sides of hub 64.
Crankshaft 32 connects to orbiting scroll plate 60 by means of a crank mechanism 68 such as a swing link connection. An eccentric crankpin 70 attached to the top of crankshaft 32 is disposed in an eccentric hole 72 in roller 74. Roller 74 is disposed within a bore 76 in orbiting hub 64 to translate the rotation of crankshaft 32 into orbiting motion for orbiting scroll assembly 50.
Scroll mechanism 46 is assembled such that orbiting scroll wrap 56 interfits with fixed scroll wrap 62 to permit compression of - refrigerant when orbiting scroll assembly 50 is orbited relative to fixed scroll assembly 48.
Orbiting scroll assembly 50 is prevented from rotating about its own axis by means of the anti rotation device 78 of the present invention.
Fig. 3 shows the anti-rotation device or Oldham ring 78 having a base member 80. Base member 80 is generally oval shaped having an opening 82 into which orbiting scroll hub 64 interfits. The unique feature of opening 82 is that it includes two straight, parallel sidewalls 86 that orbiting scroll hub 64 slides against.
More specifically, orbiting hub flats 66 slide against parallel sidewalls 86 rectilinearly, thereby preventing orbiting scroll hub 64 and orbiting scroll plate 66 from rotating within opening 82.
Base member 80 also includes keying means 88 that slidable engage a complimentary keying means 90 on frame 52. Keying means 88 may comprise axially extending tabs as shown in Fig. 4. Keying ` 3S means 88 are in a line substantially perpendicularly to parallel sidewalls 86.
. ~
2~91~2 In the preferred embodiment, keying means 88 are a pair of axially extending tabs as shown in Fig. 4, while complementary k~eying means 90 comprises a pair of grooves 94 on frame 52 into which keying means 88 moves rectilinearly. The direction anti-rotation device 78 slides in relation to orbiting hub 54 is substantially perpendicular to the direction of sliding between anti-rotation device 78 and frame 52.
The new Oldham ring 78 is smaller and lighter than prior art Oldham rings lowering the inertial forces while perpendicular tolerances are easier to maintain between sidewalls 86 of opening 82 and keying means 88.
Alternatively, the Oldham ring may be constructed with different keying means as is shown in Figs. 5 and 6. Base member 180 includes keying means that slidable engage a complimentary keying means on frame 52. Keying means comprise grooves 92 in base member 180 as shown in Fig. 6.
Complimentary keying means on frame 52 includes axially extending tabs 96 as shown in Figs. 2 and 6. Tabs 96 slide within grooves 92 during compressor operation preventing the Oldham ring from rotating relative frame 52. The orbiting hub 64 is prevented from rotation as discussed in the previous embodiment.
While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further~ this application is intended to cover such departures from the present disclosure as come within known or customary 20~8~
practice in the art to which lhis invention pertains and which fall within the limits of the appended claims.
Claims (15)
1. A hermetic scroll compressor comprising:
a housing; a frame within said housing; an orbiting scroll and stationary scroll disposed within said housing and interfit to create at least one compression pocket for compressing fluid, said orbiting scroll having a hub; a drive means for orbiting said orbiting scroll relative to said stationary scroll; and an anti-rotational device disposed between said orbiting scroll and said frame, said device comprising a base member having keying means for slidably interengaging a complementary keying means on said frame, said base member having an opening within which said orbiting scroll hub interfits and slides rectilinearly without rotating.
a housing; a frame within said housing; an orbiting scroll and stationary scroll disposed within said housing and interfit to create at least one compression pocket for compressing fluid, said orbiting scroll having a hub; a drive means for orbiting said orbiting scroll relative to said stationary scroll; and an anti-rotational device disposed between said orbiting scroll and said frame, said device comprising a base member having keying means for slidably interengaging a complementary keying means on said frame, said base member having an opening within which said orbiting scroll hub interfits and slides rectilinearly without rotating.
2. The compressor of Claim 1 in which said base member slides in relation to said frame perpendicular to the direction in which said orbiting scroll hub slides within said base member.
3. The compressor of Claim 1 in which said opening has two straight parallel sidewalls whereby said orbiting scroll hub slidingly interfits between said sides.
4. The compressor of Claim 3 in which said orbiting scroll hub has two flats on opposite sides of said hub such that said flats slide against said parallel sidewalls preventing said orbiting scroll from rotating.
5. The compressor of Claim 1 in which said base member keying means comprises a pair of axially extending tabs and said complementary keying means comprises a pair of grooves in said frame in which said base member keying means moves rectilinearly.
6. The compressor of Claim 4 in which said opening has two straight parallel sidewalls whereby said orbiting scroll hub slidingly interfits within said opening.
7. The compressor of Claim 6 in which said orbiting scroll hub has two flats on opposite sides of said hub whereby said flats slide against said parallel sidewalls preventing said orbiting scroll from rotating.
8. The compressor of Claim 1 in which said base member keying means comprises a pair of grooves and said complementary keying means comprises a pair of axially extending tabs from said frame on which said base member keying means linearly slides.
9. The compressor of Claim 8 in which said opening has two straight parallel sidewalls whereby said hub slidingly interfits within said opening.
10. The compressor of Claim 9 in which said orbiting scroll hub has two flats on opposite sides of said hub such that said flats slide against said parallel sidewalls preventing said orbiting scroll from rotating.
11. A hermetic scroll compressor comprising:
a housing including a frame having a thrust surface; an orbiting scroll and stationary scroll disposed within said housing and interfit to create at least one compression pocket for compressing fluid, said orbiting scroll having a substantially circular hub having two flat sections on opposite sides of said hub; a drive means for orbiting said orbiting scroll relative to said stationary scroll; and an oldham ring disposed between said orbiting scroll and said frame, said ring having an oval base member having an axial face oriented toward said frame, and a pair of axially extending tabs on said frame, said base having an opening with two straight parallel sides whereby said hub interfits within said opening and said flat sections slide parallel and against said sides so that said hub slides but does not rotate within said base member.
a housing including a frame having a thrust surface; an orbiting scroll and stationary scroll disposed within said housing and interfit to create at least one compression pocket for compressing fluid, said orbiting scroll having a substantially circular hub having two flat sections on opposite sides of said hub; a drive means for orbiting said orbiting scroll relative to said stationary scroll; and an oldham ring disposed between said orbiting scroll and said frame, said ring having an oval base member having an axial face oriented toward said frame, and a pair of axially extending tabs on said frame, said base having an opening with two straight parallel sides whereby said hub interfits within said opening and said flat sections slide parallel and against said sides so that said hub slides but does not rotate within said base member.
12. The compressor of Claim 11 in which said base member slides within said grooves perpendicular to the direction in which said orbiting hub slides within said base member.
13. An anti-rotational device for orbiting scrolls within a compressor frame, said device sliding between an orbiting scroll having a hub and a frame having grooves, said device sliding in a compressor, said hub having two flat sections on opposite sides of said hub, said device comprising; an oval base member having an axial face oriented toward said frame and a pair of axially extending tabs on said axial face slidably interengaged with said grooves on said frame, said base having an opening with two straight parallel sides whereby said hub interfits within said opening and said flat sections slide parallel and against said base sides so that said hub slides but does not rotate within said base member.
14. The anti-rotation device of Claim 13 in which said tabs are in a line perpendicular to said parallel sides.
15. The anti-rotation device of Claim 13 in which said base member slides within said grooves perpendicular to the direction in which said orbiting hub slides within said base member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84977692A | 1992-03-12 | 1992-03-12 | |
| US07/849,776 | 1992-03-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2091482A1 true CA2091482A1 (en) | 1993-09-13 |
Family
ID=25306500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002091482A Abandoned CA2091482A1 (en) | 1992-03-12 | 1993-03-11 | Anti-rotation ring for a scroll machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2091482A1 (en) |
-
1993
- 1993-03-11 CA CA002091482A patent/CA2091482A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19950911 |