CA1110139A - Double acting fluid operated piston cylinder assembly - Google Patents
Double acting fluid operated piston cylinder assemblyInfo
- Publication number
- CA1110139A CA1110139A CA320,839A CA320839A CA1110139A CA 1110139 A CA1110139 A CA 1110139A CA 320839 A CA320839 A CA 320839A CA 1110139 A CA1110139 A CA 1110139A
- Authority
- CA
- Canada
- Prior art keywords
- piston
- slot
- control bar
- clutch
- clutch roller
- 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
Landscapes
- Braking Arrangements (AREA)
Abstract
1.
DOUBLE ACTING FLUID OPERATED PISTON
CYLINDER ASSEMBLY
ABSTRACT OF THE DISCLOSURE
An elongated cylinder housing has a piston therein molded from a resinous plastic material. The piston has an angularly extending slot receiving a metal clutch roller operated by a clutch control bar slidable relative to the piston. The clutch control bar is secured to a secondary piston member, and springs are disposed between the piston and the secondary piston member for normally causing the control bar to pull the clutch roller into an engaged posi-tion. The clutch roller is disposed in such engaged posi-tion to prevent travel of the piston in one direction except when actuating fluid in the cylinder operates on the second-ary piston member against the force of the springs to cause the clutch roller to move the clutch control bar into a re-leased position. The bottom of the slot that receives the clutch roller is covered by metal plates to permit free roll-ing engagement of the clutch roller thereon and at the same time to prevent indentation of the clutch roller into the plastic. The roller support plates are retained in the slot by interfitting projections and notches.
DOUBLE ACTING FLUID OPERATED PISTON
CYLINDER ASSEMBLY
ABSTRACT OF THE DISCLOSURE
An elongated cylinder housing has a piston therein molded from a resinous plastic material. The piston has an angularly extending slot receiving a metal clutch roller operated by a clutch control bar slidable relative to the piston. The clutch control bar is secured to a secondary piston member, and springs are disposed between the piston and the secondary piston member for normally causing the control bar to pull the clutch roller into an engaged posi-tion. The clutch roller is disposed in such engaged posi-tion to prevent travel of the piston in one direction except when actuating fluid in the cylinder operates on the second-ary piston member against the force of the springs to cause the clutch roller to move the clutch control bar into a re-leased position. The bottom of the slot that receives the clutch roller is covered by metal plates to permit free roll-ing engagement of the clutch roller thereon and at the same time to prevent indentation of the clutch roller into the plastic. The roller support plates are retained in the slot by interfitting projections and notches.
Description
This invention relates to new and useful improvements in double acting fluid piston cylinder assemblies.
According to the present invention and forming a primary objective thereof, a piston cylinder assembly is provided 5 having a specific construction such that the pis-ton can be molded of a suitable plastic and at the same time employ a metal clutch roller without the possibility of -the roller digging into the plastic and being hindered in its clutching movement. To accomplish this purpose, the plastic piston 10 body, at angularly extending slot portions thereof which re-ceive and cause clutching operation of clutch rollers, is provided with metal or other hardened plates between the pis-ton body and the clutch roller, thus insuring that the clutch roller will operate every time and the clutch will have a 15 long life. The metal plates are held in place by retaining means which have interfitting rela-tionship with the piston.
Figure 1 is an exploded view of a piston which forms a part of the invention;
Figure 2 is a fragmentary face view, partly broken away, 20 of a cylinder housing which receives the piston in working relation, this view being taken on the line 2-2 o~ Figure 3;
Figure 3 is a fragmentary sectional view taken on the .
line 3-3 of Figure 2; and Figure 4 is an enlarged fragmentary sectional view taken 25 on the line 4-4 of Figure 2;
With particular reference to the drawings, the numeral "
- . ~
10 designates an elongated cylinder houslng which is adapted to be mounted inside a door D or the llke ~or driving a win-dow up and down. This housing has side f]anyes 12 which pro-vide suitable connection to the door frame and furthermore 5 this housing has top and bottom connections, not shown, by means of which pressured air is admitted to the cylinder housing in a well known manner. A piston 14 is slidable up and down in the cylinder housing 10, and the housing is pro-vided with a narrow slot 16 extending longitudinally thereof 10 to accommodate an arm 18 on the pis-ton 14 which is arranged to be connected to window structure to be driven up and down.
A thin semi-flexible strip 20, preferably metal, is dis-posed on the inside of the cylinder housing 10 so as to cover the slot 16 interiorly of the housing. This strip extends 15 through a channel 22 in the piston 14 and the ends thereof are secured to the top and bottom ends of the cylinder hous-ing.
The channel 22 is provided along the entire face of the piston 14 ~or receiving the strip 20~ this channel being of 20 suitable dimension to provide a sliding association with the strip. Channel 22 is deepened near the mid section of the main piston to enable the strip 20 to pass beneath a cross bar 14a formed by the deepened portion of the channel. The flexible strip 20 is thus in contact with the wall of the 25 housing along the slot 16 at all times over the entire length of the slot except at the particular location where it is diverted inwardly in the mid section of the piston so as to .' . .
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: . . .. . . .
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pass under the cross bar 14a. A sealing engagement is thus provided along the slot 16 at all places except in the area where the piston is disposed, the said area where the piston is disposed being sealed at the slot by the piston itself.
5 Thus, the piston assembly can move in the housing with effect-ive sealing.
The lower end of the piston 14 has a reduced dimension projection 24 which removably receives a flexible plunger-type cup 26 having slidable sealing engagement with the inner lOSurface of the cylinder housing.
For the purpose of holding the piston against downward settling movement when it is not being operated, assuming that the housing 10 is upright as shown in Figures 2-~, said piston is provided with a spring actuated clutch~type brake 15which will now be described. The piston is formed with a transversely extending slot 30 which as best seen in Figure 4 decreases in depth from bottom to top. A clutch brake roller 32 is carried transversely in this slot and has a center portion 34 of reduced diameter. ~ central, longitudi-20nally extending slot 36 crosses the transverse slot 30 andslidably accommodates a roller control bar 38. This control bar has a transverse slot 40 which receives the redllced center portion 34 of the clutch brake roller 32. In the arrangement shown in Figure 4 by full and phantom lines, movement of the 25control bar 38 controls the position of the roller 32 in the slot 30 between engaged and disengaged positions.
The control bar 38 has a transverse body portion ~2 from which extends a reduced diameter projection 4~ arranged to .
,, ,, , . . . . --5.
removably support a flexible plunger-like cup 46 thereon.
Cup 46 has sealing engagement with the inner surface of the cylinder houslng in the movements of the piston assembly.
A pair of coil springs 48 have their upper ends engaged on sround projections 50 on the lower face of the body portion 42 of the roller control bar, and the bot~om ends of the springs bear against the top of the piston 14. The~e springs normally urge the roller control bar 38 away from the piston 14, and by keeping such control bar normally in such position, l0the clutch brake roller 32 is held in the full line position of Figure 4 which is its wedging position between the piston body 14 and the wall of the cylinder housing 10. In such position, the roller 32 prevents downward movement of the piston in the cylinder housiny but permits upward movement 15oE the piston. However, downward pressure on the top of the roller control bar 38 ~lich compresses the springs 48 results in positioning the roller 32 lower down in the slot 30, namely, in the phantom line position of Figure 4, and out of wedging or clutching engagement between the piston and the cylinder 20housing. This permits downward movement of the piston in the cylinder housing, and such movement can take place as long as pressure is exerted on the top of the roller control bar 38.
It is thus apparent that the piston will move up and down when driven by fluid force but will be located in position 25against downward movement when the fluid pressure ceases.
Thus, the window can be raised either manually or by fluid pressure but the window will not move down except when there is fluid pressure on top of the piston.
.~ , -.
, .
6.
The structure of the piston described facilitates mold~
ing it from a suitable plastic material so as to be rugged in operation but relatively inexpensive. The clutch brake roller 32 is preferably constructed of a metal so as to have long 51ife particularly in its engagement of the cylinder housing which likewise is preferably constructed of metal such as from extruded aluminum. To prevent the roller from digging into the plastic at the bottom of the slo-t 30, the bottom of the slot is protected by a metal layer 54. The metal l01ayer 54 comprises a pair of plate-like inserts disposed one on each side of the roller control bar 38 for engagement by clutch brake roller 32. Since the inserts 54 extend the full length of the slot 30, they cannot be displaced longi-tudinally. ~Iowever, to prevent transverse displacement and possible interference with operation of the roller control bar 38, the bottom of the slot 30, located at least at one end thereof and preferably at both ends is provided with pro-jections 56 and the plates 54 have notches 58 which receive the projections. Although the above locking structure for 20the plates 54 is a pre~erred one, the plates 54 could possi-bly have the projections as a par-t thereof and the notches could be provided in the walls of slot 30. Plates 54 are preferably inserted loose in the slots as inserts and thus can be readily replaced if necessary.
.
., . . i : ' :` , ' : ' ' '' ' ' . . "' ' " :
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According to the present invention and forming a primary objective thereof, a piston cylinder assembly is provided 5 having a specific construction such that the pis-ton can be molded of a suitable plastic and at the same time employ a metal clutch roller without the possibility of -the roller digging into the plastic and being hindered in its clutching movement. To accomplish this purpose, the plastic piston 10 body, at angularly extending slot portions thereof which re-ceive and cause clutching operation of clutch rollers, is provided with metal or other hardened plates between the pis-ton body and the clutch roller, thus insuring that the clutch roller will operate every time and the clutch will have a 15 long life. The metal plates are held in place by retaining means which have interfitting rela-tionship with the piston.
Figure 1 is an exploded view of a piston which forms a part of the invention;
Figure 2 is a fragmentary face view, partly broken away, 20 of a cylinder housing which receives the piston in working relation, this view being taken on the line 2-2 o~ Figure 3;
Figure 3 is a fragmentary sectional view taken on the .
line 3-3 of Figure 2; and Figure 4 is an enlarged fragmentary sectional view taken 25 on the line 4-4 of Figure 2;
With particular reference to the drawings, the numeral "
- . ~
10 designates an elongated cylinder houslng which is adapted to be mounted inside a door D or the llke ~or driving a win-dow up and down. This housing has side f]anyes 12 which pro-vide suitable connection to the door frame and furthermore 5 this housing has top and bottom connections, not shown, by means of which pressured air is admitted to the cylinder housing in a well known manner. A piston 14 is slidable up and down in the cylinder housing 10, and the housing is pro-vided with a narrow slot 16 extending longitudinally thereof 10 to accommodate an arm 18 on the pis-ton 14 which is arranged to be connected to window structure to be driven up and down.
A thin semi-flexible strip 20, preferably metal, is dis-posed on the inside of the cylinder housing 10 so as to cover the slot 16 interiorly of the housing. This strip extends 15 through a channel 22 in the piston 14 and the ends thereof are secured to the top and bottom ends of the cylinder hous-ing.
The channel 22 is provided along the entire face of the piston 14 ~or receiving the strip 20~ this channel being of 20 suitable dimension to provide a sliding association with the strip. Channel 22 is deepened near the mid section of the main piston to enable the strip 20 to pass beneath a cross bar 14a formed by the deepened portion of the channel. The flexible strip 20 is thus in contact with the wall of the 25 housing along the slot 16 at all times over the entire length of the slot except at the particular location where it is diverted inwardly in the mid section of the piston so as to .' . .
' ..
. : ': ' ~. . , , , ~ . , ' . ,:
: . . .. . . .
.. , . . , :
pass under the cross bar 14a. A sealing engagement is thus provided along the slot 16 at all places except in the area where the piston is disposed, the said area where the piston is disposed being sealed at the slot by the piston itself.
5 Thus, the piston assembly can move in the housing with effect-ive sealing.
The lower end of the piston 14 has a reduced dimension projection 24 which removably receives a flexible plunger-type cup 26 having slidable sealing engagement with the inner lOSurface of the cylinder housing.
For the purpose of holding the piston against downward settling movement when it is not being operated, assuming that the housing 10 is upright as shown in Figures 2-~, said piston is provided with a spring actuated clutch~type brake 15which will now be described. The piston is formed with a transversely extending slot 30 which as best seen in Figure 4 decreases in depth from bottom to top. A clutch brake roller 32 is carried transversely in this slot and has a center portion 34 of reduced diameter. ~ central, longitudi-20nally extending slot 36 crosses the transverse slot 30 andslidably accommodates a roller control bar 38. This control bar has a transverse slot 40 which receives the redllced center portion 34 of the clutch brake roller 32. In the arrangement shown in Figure 4 by full and phantom lines, movement of the 25control bar 38 controls the position of the roller 32 in the slot 30 between engaged and disengaged positions.
The control bar 38 has a transverse body portion ~2 from which extends a reduced diameter projection 4~ arranged to .
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removably support a flexible plunger-like cup 46 thereon.
Cup 46 has sealing engagement with the inner surface of the cylinder houslng in the movements of the piston assembly.
A pair of coil springs 48 have their upper ends engaged on sround projections 50 on the lower face of the body portion 42 of the roller control bar, and the bot~om ends of the springs bear against the top of the piston 14. The~e springs normally urge the roller control bar 38 away from the piston 14, and by keeping such control bar normally in such position, l0the clutch brake roller 32 is held in the full line position of Figure 4 which is its wedging position between the piston body 14 and the wall of the cylinder housing 10. In such position, the roller 32 prevents downward movement of the piston in the cylinder housiny but permits upward movement 15oE the piston. However, downward pressure on the top of the roller control bar 38 ~lich compresses the springs 48 results in positioning the roller 32 lower down in the slot 30, namely, in the phantom line position of Figure 4, and out of wedging or clutching engagement between the piston and the cylinder 20housing. This permits downward movement of the piston in the cylinder housing, and such movement can take place as long as pressure is exerted on the top of the roller control bar 38.
It is thus apparent that the piston will move up and down when driven by fluid force but will be located in position 25against downward movement when the fluid pressure ceases.
Thus, the window can be raised either manually or by fluid pressure but the window will not move down except when there is fluid pressure on top of the piston.
.~ , -.
, .
6.
The structure of the piston described facilitates mold~
ing it from a suitable plastic material so as to be rugged in operation but relatively inexpensive. The clutch brake roller 32 is preferably constructed of a metal so as to have long 51ife particularly in its engagement of the cylinder housing which likewise is preferably constructed of metal such as from extruded aluminum. To prevent the roller from digging into the plastic at the bottom of the slo-t 30, the bottom of the slot is protected by a metal layer 54. The metal l01ayer 54 comprises a pair of plate-like inserts disposed one on each side of the roller control bar 38 for engagement by clutch brake roller 32. Since the inserts 54 extend the full length of the slot 30, they cannot be displaced longi-tudinally. ~Iowever, to prevent transverse displacement and possible interference with operation of the roller control bar 38, the bottom of the slot 30, located at least at one end thereof and preferably at both ends is provided with pro-jections 56 and the plates 54 have notches 58 which receive the projections. Although the above locking structure for 20the plates 54 is a pre~erred one, the plates 54 could possi-bly have the projections as a par-t thereof and the notches could be provided in the walls of slot 30. Plates 54 are preferably inserted loose in the slots as inserts and thus can be readily replaced if necessary.
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Claims (4)
1. A double acting fluid operated piston cylinder assembly comprising (a) an elongated cylinder housing having defining wall portions and opposite ends arranged alternately to receive actuating fluid, (b) a piston assembly including a main piston body molded from a resinous plastic material, (c) said piston body having an open transverse slot extending thereacross, (d) the bottom of said slot extending angularly re-lative to the longitudinal center line of the cylinder hous-ing and of said main piston body and having end portions one of which is a low side of greater depth and the other of which is a high side of less depth, (e) a metal insert seated on said bottom of the slot, (f) a clutch roller in said slot having opposite ends and rotatably engageable at its opposite ends on said metal insert, (g) said clutch roller being of proper size to have clutching engagement between said metal insert and a wall por-tion of said cylinder housing when said roller moves from the low side towards the high side of said slot bottom, (b) said main piston body having a second slot extend-ing in a longitudinal direction from the end of said main member nearest the high side of said first mentioned slot bottom and traversing said first mentioned slot, (i) a clutch control bar slidable in said second slot, (j) means on said control bar engaging said clutch roller so as to cause movement of said clutch roller in said first mentioned slot when said control bar is moved in said main piston body, (k) a secondary piston member located beyond said end of said main piston body, (1) said control bar being integral with said secondary piston member, (m) and spring means interposed between said main pis-ton body and said secondary piston member and normally acting to cause said control bar to pull said clutch roller toward said high side of said first mentioned slot bottom, whereby said clutch roller and control bar and spring means will act to prevent travel of said piston assembly in the cylinder in one direction except when the actuating fluid in said cylinder thrusts said secondary piston closer to said main piston body against the force of said spring means, thereby automatically causing said clutch roller to be moved by said control bar in-to releasing position.
2. The double acting fluid operated piston cylinder assembly of claim 1 wherein said means on said control bar engaging said clutch roller comprises means defining a trans-verse slot receiving said clutch roller intermediate its ends, said metal insert comprising a pair of plates seated on the bottom of said open transverse slot in said piston body on opposite sides of said clutch control bar.
3. The double acting fluid operated piston cylinder assembly of claim 1 wherein said means on said control bar engaging said clutch roller comprises means defining a trans-verse slot receiving said clutch roller intermediate its ends, said metal insert comprising a pair of plates seated on the bottom of said open transverse slot in said piston body on opposite sides of said clutch control bar, and re-taining means in the slot in said main piston body engageable with said support plates preventing transverse displacement of said plates.
4. The double acting fluid operated piston cylinder assembly of claim 1 including interfitting projections and notches on said plates and respective portions of said open transverse slot in said piston body preventing transverse displacement of said plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA320,839A CA1110139A (en) | 1979-02-05 | 1979-02-05 | Double acting fluid operated piston cylinder assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA320,839A CA1110139A (en) | 1979-02-05 | 1979-02-05 | Double acting fluid operated piston cylinder assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1110139A true CA1110139A (en) | 1981-10-06 |
Family
ID=4113458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA320,839A Expired CA1110139A (en) | 1979-02-05 | 1979-02-05 | Double acting fluid operated piston cylinder assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1110139A (en) |
-
1979
- 1979-02-05 CA CA320,839A patent/CA1110139A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |