CA1037360A - Double acting fluid cylinder - Google Patents
Double acting fluid cylinderInfo
- Publication number
- CA1037360A CA1037360A CA213,360A CA213360A CA1037360A CA 1037360 A CA1037360 A CA 1037360A CA 213360 A CA213360 A CA 213360A CA 1037360 A CA1037360 A CA 1037360A
- Authority
- CA
- Canada
- Prior art keywords
- housing
- strip
- cylinder
- caps
- aperture
- 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
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/082—Characterised by the construction of the motor unit the motor being of the slotted cylinder type
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
ABSTRACT
A piston and cylinder are provided wherein the piston has driving movement in both directions and instead of having the usual piston rod it has an arm projecting through a slot in the cylinder. Such slot is sealed off by a flexible strip anchored at the ends of the cylinder and having tension means acting thereon to maintain it in a tight condition for effective sealing. The cylinder of the invention has efficient usage as the drive means for truck cab windows and utilizes an extruded cylinder portion of minimum dimension parti-cularly applicable for installation in truck doors to drive the windows.
A piston and cylinder are provided wherein the piston has driving movement in both directions and instead of having the usual piston rod it has an arm projecting through a slot in the cylinder. Such slot is sealed off by a flexible strip anchored at the ends of the cylinder and having tension means acting thereon to maintain it in a tight condition for effective sealing. The cylinder of the invention has efficient usage as the drive means for truck cab windows and utilizes an extruded cylinder portion of minimum dimension parti-cularly applicable for installation in truck doors to drive the windows.
Description
1~73Si~
DC)IJBLE ACTING FLUID CYLINDER
This invention relate~ to new and useïul improvements in double acting ~luid cylinders.
Prior art devices have heretol`ore been proposed wherein double acting cylinders are coIlstructed of a slidable piston which instead of utilizing an axially extending piston rod utilizes a laterally projecting drive arm which ~-extends through a longitudinal slot in the side of the cylinder. These structures have the advantage that they require a minimum of length dimension in the mount-ing area therefor. Such a device is shown in Patent No~, 3, 2211 610 of which the l ~ present applicant is a joint patentee, In such prior art structure, side sealing means is required since the drive arm connected to the piston projects throùgh the side of the cylinder. Such sealing means of the prior art often becomes defective after a period of use of the cylinder due to the wea~ing or strain on the parts,, ;
According to the present invention and forming a primary objective thereof, a double acting fluid cylinder is provided which has a laterally projecting drive arm on the piston instead of the usual axial piston rod extending through an end of the cylinder, the assembly being arranged to provide for effective sealing alo-ng the side of the cylinder through which the drive arm projects, and further-0 more to provide a sealing structure which is applied under selected tension and maintained through a long time even with normal wear. ~;
Another object is to provide a cylinder of the type described wherein the cylinder portion has a structure facilitating extrusion thereof for ease of manufacture and having a structure which takes up a minimum of space so as to be applicable for use as a window lift in truck cabs or the like.
Yet another object of the invention is to provide a cylinder of the type described having component parts which facilitate easy assembly, dis- `
assembly and maintenance. 2~
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~L0373~
The invention will be better understood and additional objects and ad~antages wi~l become apparent from the following description taken Ln connect-ion with the accompanying drawings which illustrate a preferred :torm of the device, Figure 1 is an elevational view, more or less diagrammatic, iLlus-trating application of the present cylinder in. the operation of a window in the cab door of a truck;
Figure 2 is an enlarged, foreshortened elevational view of the present cylinder taken on the line 2-2 of Figure 3, a window holding bracket of the struc-ture being omitted for purposes of clarity;
Figure 3 is a vertical sectional view in reduced scale taken on the line 3-3 of Figure 2;
Figure 4 is a foreshortened sectional view taken on the line 4-4 of Figure 2;
Figures 5, 6, 7, and 8 are enlarged horizontal sectional views taken on the line 5-5, 6-6, 7-7 and 8-8 of Figure 3, respectively; these views being turned 90 degrees to the right relative to Figure 3.
Figure 9 is a si~ple diagram illustrating the operating control for the cylinder and piston assembly;
Figure 10 is an exploded view in perspective showing an end assembly of the cylinder; and Figure ll is an exploded view in perspective showing the components of the piston assembly. `
Referring first to Figure l, the fluid cylinder assembly 12 of the present invention is shown mounted inside a truck cab door 14. Such door has a window 16 mounted for sliding up and down movement in a conventional manner, the present cylinder being mounted below the window and having connection to the window and door by means to be described.
The top and bottom ends of the cylinder 12 are provided with ports 18 and 20, respectively, Figure 2 and 9, both OI which pOI ts are connected by " ' , . -,- - . - :, . " . , 1~1373~
by air lLnes 18a and 20a, respectively, to a suitahle control valve 22 of a well known type, by means of which either port can be connected to a source of com-pressed fluid (not ~hown) and the other connected to exha~lstO A piston assembly designated generally by the numeral 24 is slidable up and down in the cylinder 12.
The cylinder assembly 12 comprises an elong~ted housing 26, Fig-ures 3-8J which can be readily formed by extrusion and cut to length. The housing 26 has side flanges 28 by means of which it may be secured Elatwise to an inner surface of the door 14 in upright position. A wall of the housing 26 has a narrow slot 30 therein which extends longitudinally the full length thereof.
10 This slot accommodates an arm 32 of the piston assembly 24 which extends out from such assembly beyond the cylinder in a slidable arrangementO A thin, semi-ilexible strip of material 34, preferably metal, Figures 2J 3J 5-8J and 10 is disposed on the inside of the housing 26 so as to cover the slot 30 in those areas not occupied by the piston 24J this strip being associated with the piston assembly in a manner to be described hereinafterO
The arm 32 of the piston assembly is integral with a main piston body 36J Figures 3, 7 and 11J and extends out through the slot 30 of the housing. ~`
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The lower end of the main piston body 26 has a reduced dimension projection 38 ..
for supporting a ~lexible plunger-type cup 40 which has slidable sealing engage-20 ment with the inner surface of the housing 26, the projection 3~ being provided with a peripheral llange 42 having locking engagement in an aperture 43 in the cup.
For the purpose of holding the piston assembly 24 and therewith the window 16:Eirmly against any inadvertent downward settling movement when the piston assembly is not being operated, the latter is provided with a spring actuated clutch-type brake which will now be described. The rnain body portion 36 of the pïston assembly, as best shown in Figures 2, 4, 6 and 11, is formed with a transversely extending slot 44 which as best seen in .. :. . ..
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Figure 4 decreases in depth from bottom to top, ~ c~utch brake roller 46 is carried transversely in this slot and has a center portion 48 of reduced diameter.
A central, longitudinally e~tending ~;lot 50 crosses the transverse slot 44 and slidably accommodates a roller control bar 52. This control bar has a trans-verse slot 54 which receives the reduced center portion 48 of the clutch brake roller 46. In the arrangement shown particularly in Figure 4 by full and phan-tom lines, movement of the control bar 52 controls the position of the roller 46 in the slot 440 The control bar 52 has a trans~erse body portion 56 from which 10 extends a reduced diameter projection 58 arranged to support a llexible plunger-like cup 60 thereon, the projection 58 having an end flange 62 and arranged to have locking engagement in an aperture 64 in the cup 600 Cup 60 has a seal-ing engagement with the inner surface of the housing 26 in the movements of the piston assembly. A pair of coil springs 68 have their upper ends engaged on round projections 70 on the lower face of the body portion 56 of the ro~ler control bar, and the bottom ends of these springs bear against the top of the piston body 36. These springs normally keep the roller control bar spaced from the main piston body 36, and by keeping such control bar normally in raised position, they hold the clutch brake roller 46 in upper position, namely"
20 in the full line position OI Figure 49 and thus in wedging position between the piston body 36 and the wall of the cylinder housing 26. In such position, the roller 46 prevents downward movement oE the piston in the cylinder but permits upward move~nent of the piston. Eowever, downward pressure on the top of ~`
the ro~ler control bar against the force oE the springs 68 results in positioning the roller 46 lower down in the slot 44, namely, in the phantorn line position of Figure 4, and out of wedging or clutching engagement between the piston and the cylinder" This permits downward movement of the piston in the cylinder to take place as long as pressure is exerted on the top of the ro~ler control q ~ .
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bar 52, whereupon it is apparent that the piston will move up and down when driven by the fluid îorce but will be locked in position against downward move-ment when the Lluid pressure is removed, Such prevents the window from moving down when there is no Eluid pressure. The window however can be raised manually without fluid pressureO
The upper end of the housing 26 is closed by a plug 72 and associa-ted cap 74, Figures 2-4, and ~0. Plug 72 fits snugly within the housing, as does a portion of cap 74, the latter member having an end Elange 76 which -engages the end of the housing and which is secured thereto by a pair of screws 10 78 arranged to be threadedly engaged in the end of housing aligned with the , ~ilanges 28. Cap 74 has a reduced end portion 80 received in a recess 82 in the ;
plug 72" An O-ring 84 is placed on the reduced end portion 8û so as to be disposed between the shoulder 85 formed by the reduced end portion 80 and the end of plug 72. A pair of screws 86 extend through the cap 74 and have thread~
ed engagement with the plug 72 to not only hold the two parts together but also -to compress the O-ring and form a positive seal for the housing.
The other or bottom end of the housing 26 is closed by an end plug 72a and cap 74a, Figures 2, 3, 4 and 8, the same as described in co~ection with that described in connection with the top end, the corresponding parts , 20 being designated by the same reference numeral but additionally with an a The bottom end cap 74a, as well as its associated plug 72a, Figures 2 and 3, ~ ;
has a longitudinal side groove 88 in which an adjacent end portion of the strip 34 lies, such groove being of substantia~ly the same width as the strip 34 and a depth corresponding to the thickness of the said strip for effective sealing with the O-ring 84a, The strip 34 at this lower end has an aperture 90, and an anchor pin 92 is mounted in the end cap 74a arranged for engagement in the aperture 90 to provide an anchor for one end of the strip.
The end cap 74 at the upper end of the housing 26, Figures 3 and 10, has a top groove 96 which starts intermediate the sides of the top surface ,. -:.: :: . .. ... .. , .; , , ... . - :.
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and leads in a deepening dimension toward the side at which the strip 34 is disposed, the side surface of the cap 74 and plug 72 al~o having a groove 88 as in the bottom cap 74a ancl plug 72a for receiving the strip 34. Secured on the end of the cap 74 by means of the screws 78 is a leaE spring lever 100 have a widened body portion 102 for receivmg the screws and having a tongue portion 104 an end portion oE which is slightly off-set from the plane of the body portion but norma~ly parallel thereto~, The end of the strip 34 adjacent to the lever 102 has an aperture 105 arranged to receive an end portion of the tongue 104 of the lever 100. The arrangement is such that in the assembly of this end of the housing the body portion 102 of lever 100 is clamped flat on the end of cap 74 by the screws 78 and the tongue 104 must be bent down in the groove 96 for -~
reception in the aperture 1O5D By this arrangementJ the lever 100 applies a cl3nstant tensioning force on the strip 34 even with some wear of the parts~
thus maintaining a good sealing disposition with the slot 30, A channel 106 is provided in the face of the piston assembly for receiving the strip 34, this channel being of suitable dimension to provide a ~ -sliding association with the strip" This channel is also provided in the end cups 40 and 60 and also in the ilange 56 of the roller contrc)l bar 52 and is deepened at 106a near the mid section of the main piston body 36 to enable the 20 strip 34 to pass beneath a cross bar 36a formed by the deepened portion of the channel.; The flexible strip 34 is thus in contact with the wall of the housing~
along the inside of the slot 30 at all times over the entire length OI the slot except at the particular location on the piston where it is diverted irlwardly in the mid secbion OI the piston so as to pass under the cross bar 36a. A
sealing engagement is thus provided along the slot 30 in 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. Thus, the piston assem-bly can move up and down in the housing with effective sealing in the entire housing. 6 ~L0373s~i~
The double act~ng Eluid cylincler is illustr~ted in Figwres 1 and 3 as comprising a drive for a truck cab winclow wherein the arm 32 is engaged in an aperture 107, Figure 3, of a bracket 108 comprising a window lift brack-et having an upper channel portion 110 arranged to receive the door glass 16.
Arm 32 is notched top and bottom at 32a fc~r reception in the aperture, such notched portion serving to hold the bracket 108 in spaced relation from the ~;
cylinder housing 26 so that it will not rub on the housing.
VVith reference to Figures 2, 3, and 7 a stop 112 is secured to the front wall of the housing 26 adjacent the lower end thereof. This stop has 10 rearwardly extending arms 114 and right angle tabs 116 through which rivets 118 extend to secure the stop to the flange portions 28 of the housing 26. The ;
stop 112 is selectively located to limit the downward movement of the piston -as determined by the desired range of travel of such piston" The upward travel of the piston is limited by engagement of such piston with the upper plug 72.
It is preferred that the slot 30 in the cylinder housing 2B have a dust cover, and for this purpose a thin fle~ible strip 120, Figures 2-8, is secured as by adhesive 122 in a longitudinal recess 124 in the outer face of 20 said housing. The strip is slit longitudinally at 126 along the path of travel of arm 32, and such arm moves through such slit with the fle~ible material of the strip closing and opening closely thereto to keep out dust~, According to the inventio~ a double acting fluid cylinder is provi~
ded which drives through a side of the cylinder rather than through an end piston rod and which by its structure has effective sealing through the side drive opening~ Such sealing is accomplished, even though slight wear of the parts occurs, by the tensioning lever 102 operating on the strip 34, The pre- -sent device by its construction also is readily assembled and disassembled and easily maintained.
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~)3736~
It is to be unclerstood that the form of my invention herein shown.
and described is to be taken as a pre:~erre~l example of the same and that vari-ous changes in the shape, size and arrallgernent of parts may be re~orted to without departing from the spirit of my invention, or the scope of the subjoined claims.
"'`~,', ~ ..
, . .
.
DC)IJBLE ACTING FLUID CYLINDER
This invention relate~ to new and useïul improvements in double acting ~luid cylinders.
Prior art devices have heretol`ore been proposed wherein double acting cylinders are coIlstructed of a slidable piston which instead of utilizing an axially extending piston rod utilizes a laterally projecting drive arm which ~-extends through a longitudinal slot in the side of the cylinder. These structures have the advantage that they require a minimum of length dimension in the mount-ing area therefor. Such a device is shown in Patent No~, 3, 2211 610 of which the l ~ present applicant is a joint patentee, In such prior art structure, side sealing means is required since the drive arm connected to the piston projects throùgh the side of the cylinder. Such sealing means of the prior art often becomes defective after a period of use of the cylinder due to the wea~ing or strain on the parts,, ;
According to the present invention and forming a primary objective thereof, a double acting fluid cylinder is provided which has a laterally projecting drive arm on the piston instead of the usual axial piston rod extending through an end of the cylinder, the assembly being arranged to provide for effective sealing alo-ng the side of the cylinder through which the drive arm projects, and further-0 more to provide a sealing structure which is applied under selected tension and maintained through a long time even with normal wear. ~;
Another object is to provide a cylinder of the type described wherein the cylinder portion has a structure facilitating extrusion thereof for ease of manufacture and having a structure which takes up a minimum of space so as to be applicable for use as a window lift in truck cabs or the like.
Yet another object of the invention is to provide a cylinder of the type described having component parts which facilitate easy assembly, dis- `
assembly and maintenance. 2~
.. ~ .
~L0373~
The invention will be better understood and additional objects and ad~antages wi~l become apparent from the following description taken Ln connect-ion with the accompanying drawings which illustrate a preferred :torm of the device, Figure 1 is an elevational view, more or less diagrammatic, iLlus-trating application of the present cylinder in. the operation of a window in the cab door of a truck;
Figure 2 is an enlarged, foreshortened elevational view of the present cylinder taken on the line 2-2 of Figure 3, a window holding bracket of the struc-ture being omitted for purposes of clarity;
Figure 3 is a vertical sectional view in reduced scale taken on the line 3-3 of Figure 2;
Figure 4 is a foreshortened sectional view taken on the line 4-4 of Figure 2;
Figures 5, 6, 7, and 8 are enlarged horizontal sectional views taken on the line 5-5, 6-6, 7-7 and 8-8 of Figure 3, respectively; these views being turned 90 degrees to the right relative to Figure 3.
Figure 9 is a si~ple diagram illustrating the operating control for the cylinder and piston assembly;
Figure 10 is an exploded view in perspective showing an end assembly of the cylinder; and Figure ll is an exploded view in perspective showing the components of the piston assembly. `
Referring first to Figure l, the fluid cylinder assembly 12 of the present invention is shown mounted inside a truck cab door 14. Such door has a window 16 mounted for sliding up and down movement in a conventional manner, the present cylinder being mounted below the window and having connection to the window and door by means to be described.
The top and bottom ends of the cylinder 12 are provided with ports 18 and 20, respectively, Figure 2 and 9, both OI which pOI ts are connected by " ' , . -,- - . - :, . " . , 1~1373~
by air lLnes 18a and 20a, respectively, to a suitahle control valve 22 of a well known type, by means of which either port can be connected to a source of com-pressed fluid (not ~hown) and the other connected to exha~lstO A piston assembly designated generally by the numeral 24 is slidable up and down in the cylinder 12.
The cylinder assembly 12 comprises an elong~ted housing 26, Fig-ures 3-8J which can be readily formed by extrusion and cut to length. The housing 26 has side flanges 28 by means of which it may be secured Elatwise to an inner surface of the door 14 in upright position. A wall of the housing 26 has a narrow slot 30 therein which extends longitudinally the full length thereof.
10 This slot accommodates an arm 32 of the piston assembly 24 which extends out from such assembly beyond the cylinder in a slidable arrangementO A thin, semi-ilexible strip of material 34, preferably metal, Figures 2J 3J 5-8J and 10 is disposed on the inside of the housing 26 so as to cover the slot 30 in those areas not occupied by the piston 24J this strip being associated with the piston assembly in a manner to be described hereinafterO
The arm 32 of the piston assembly is integral with a main piston body 36J Figures 3, 7 and 11J and extends out through the slot 30 of the housing. ~`
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The lower end of the main piston body 26 has a reduced dimension projection 38 ..
for supporting a ~lexible plunger-type cup 40 which has slidable sealing engage-20 ment with the inner surface of the housing 26, the projection 3~ being provided with a peripheral llange 42 having locking engagement in an aperture 43 in the cup.
For the purpose of holding the piston assembly 24 and therewith the window 16:Eirmly against any inadvertent downward settling movement when the piston assembly is not being operated, the latter is provided with a spring actuated clutch-type brake which will now be described. The rnain body portion 36 of the pïston assembly, as best shown in Figures 2, 4, 6 and 11, is formed with a transversely extending slot 44 which as best seen in .. :. . ..
; .. . . ~. .
~6~373~iO
Figure 4 decreases in depth from bottom to top, ~ c~utch brake roller 46 is carried transversely in this slot and has a center portion 48 of reduced diameter.
A central, longitudinally e~tending ~;lot 50 crosses the transverse slot 44 and slidably accommodates a roller control bar 52. This control bar has a trans-verse slot 54 which receives the reduced center portion 48 of the clutch brake roller 46. In the arrangement shown particularly in Figure 4 by full and phan-tom lines, movement of the control bar 52 controls the position of the roller 46 in the slot 440 The control bar 52 has a trans~erse body portion 56 from which 10 extends a reduced diameter projection 58 arranged to support a llexible plunger-like cup 60 thereon, the projection 58 having an end flange 62 and arranged to have locking engagement in an aperture 64 in the cup 600 Cup 60 has a seal-ing engagement with the inner surface of the housing 26 in the movements of the piston assembly. A pair of coil springs 68 have their upper ends engaged on round projections 70 on the lower face of the body portion 56 of the ro~ler control bar, and the bottom ends of these springs bear against the top of the piston body 36. These springs normally keep the roller control bar spaced from the main piston body 36, and by keeping such control bar normally in raised position, they hold the clutch brake roller 46 in upper position, namely"
20 in the full line position OI Figure 49 and thus in wedging position between the piston body 36 and the wall of the cylinder housing 26. In such position, the roller 46 prevents downward movement oE the piston in the cylinder but permits upward move~nent of the piston. Eowever, downward pressure on the top of ~`
the ro~ler control bar against the force oE the springs 68 results in positioning the roller 46 lower down in the slot 44, namely, in the phantorn line position of Figure 4, and out of wedging or clutching engagement between the piston and the cylinder" This permits downward movement of the piston in the cylinder to take place as long as pressure is exerted on the top of the ro~ler control q ~ .
~ 037~
bar 52, whereupon it is apparent that the piston will move up and down when driven by the fluid îorce but will be locked in position against downward move-ment when the Lluid pressure is removed, Such prevents the window from moving down when there is no Eluid pressure. The window however can be raised manually without fluid pressureO
The upper end of the housing 26 is closed by a plug 72 and associa-ted cap 74, Figures 2-4, and ~0. Plug 72 fits snugly within the housing, as does a portion of cap 74, the latter member having an end Elange 76 which -engages the end of the housing and which is secured thereto by a pair of screws 10 78 arranged to be threadedly engaged in the end of housing aligned with the , ~ilanges 28. Cap 74 has a reduced end portion 80 received in a recess 82 in the ;
plug 72" An O-ring 84 is placed on the reduced end portion 8û so as to be disposed between the shoulder 85 formed by the reduced end portion 80 and the end of plug 72. A pair of screws 86 extend through the cap 74 and have thread~
ed engagement with the plug 72 to not only hold the two parts together but also -to compress the O-ring and form a positive seal for the housing.
The other or bottom end of the housing 26 is closed by an end plug 72a and cap 74a, Figures 2, 3, 4 and 8, the same as described in co~ection with that described in connection with the top end, the corresponding parts , 20 being designated by the same reference numeral but additionally with an a The bottom end cap 74a, as well as its associated plug 72a, Figures 2 and 3, ~ ;
has a longitudinal side groove 88 in which an adjacent end portion of the strip 34 lies, such groove being of substantia~ly the same width as the strip 34 and a depth corresponding to the thickness of the said strip for effective sealing with the O-ring 84a, The strip 34 at this lower end has an aperture 90, and an anchor pin 92 is mounted in the end cap 74a arranged for engagement in the aperture 90 to provide an anchor for one end of the strip.
The end cap 74 at the upper end of the housing 26, Figures 3 and 10, has a top groove 96 which starts intermediate the sides of the top surface ,. -:.: :: . .. ... .. , .; , , ... . - :.
~L~373~J
and leads in a deepening dimension toward the side at which the strip 34 is disposed, the side surface of the cap 74 and plug 72 al~o having a groove 88 as in the bottom cap 74a ancl plug 72a for receiving the strip 34. Secured on the end of the cap 74 by means of the screws 78 is a leaE spring lever 100 have a widened body portion 102 for receivmg the screws and having a tongue portion 104 an end portion oE which is slightly off-set from the plane of the body portion but norma~ly parallel thereto~, The end of the strip 34 adjacent to the lever 102 has an aperture 105 arranged to receive an end portion of the tongue 104 of the lever 100. The arrangement is such that in the assembly of this end of the housing the body portion 102 of lever 100 is clamped flat on the end of cap 74 by the screws 78 and the tongue 104 must be bent down in the groove 96 for -~
reception in the aperture 1O5D By this arrangementJ the lever 100 applies a cl3nstant tensioning force on the strip 34 even with some wear of the parts~
thus maintaining a good sealing disposition with the slot 30, A channel 106 is provided in the face of the piston assembly for receiving the strip 34, this channel being of suitable dimension to provide a ~ -sliding association with the strip" This channel is also provided in the end cups 40 and 60 and also in the ilange 56 of the roller contrc)l bar 52 and is deepened at 106a near the mid section of the main piston body 36 to enable the 20 strip 34 to pass beneath a cross bar 36a formed by the deepened portion of the channel.; The flexible strip 34 is thus in contact with the wall of the housing~
along the inside of the slot 30 at all times over the entire length OI the slot except at the particular location on the piston where it is diverted irlwardly in the mid secbion OI the piston so as to pass under the cross bar 36a. A
sealing engagement is thus provided along the slot 30 in 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. Thus, the piston assem-bly can move up and down in the housing with effective sealing in the entire housing. 6 ~L0373s~i~
The double act~ng Eluid cylincler is illustr~ted in Figwres 1 and 3 as comprising a drive for a truck cab winclow wherein the arm 32 is engaged in an aperture 107, Figure 3, of a bracket 108 comprising a window lift brack-et having an upper channel portion 110 arranged to receive the door glass 16.
Arm 32 is notched top and bottom at 32a fc~r reception in the aperture, such notched portion serving to hold the bracket 108 in spaced relation from the ~;
cylinder housing 26 so that it will not rub on the housing.
VVith reference to Figures 2, 3, and 7 a stop 112 is secured to the front wall of the housing 26 adjacent the lower end thereof. This stop has 10 rearwardly extending arms 114 and right angle tabs 116 through which rivets 118 extend to secure the stop to the flange portions 28 of the housing 26. The ;
stop 112 is selectively located to limit the downward movement of the piston -as determined by the desired range of travel of such piston" The upward travel of the piston is limited by engagement of such piston with the upper plug 72.
It is preferred that the slot 30 in the cylinder housing 2B have a dust cover, and for this purpose a thin fle~ible strip 120, Figures 2-8, is secured as by adhesive 122 in a longitudinal recess 124 in the outer face of 20 said housing. The strip is slit longitudinally at 126 along the path of travel of arm 32, and such arm moves through such slit with the fle~ible material of the strip closing and opening closely thereto to keep out dust~, According to the inventio~ a double acting fluid cylinder is provi~
ded which drives through a side of the cylinder rather than through an end piston rod and which by its structure has effective sealing through the side drive opening~ Such sealing is accomplished, even though slight wear of the parts occurs, by the tensioning lever 102 operating on the strip 34, The pre- -sent device by its construction also is readily assembled and disassembled and easily maintained.
. ... .
~)3736~
It is to be unclerstood that the form of my invention herein shown.
and described is to be taken as a pre:~erre~l example of the same and that vari-ous changes in the shape, size and arrallgernent of parts may be re~orted to without departing from the spirit of my invention, or the scope of the subjoined claims.
"'`~,', ~ ..
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Claims (4)
1. A double acting fluid cylinder comprising an elongated cylinder housing having opposite ends, a plug fitted snugly in each end of said housing having an outer end edge and a central recess, a cap disposed at each end of said housing, an end flange on said caps abutted against respective ends of said housing, screw means extend-ing through said flange and engageable with said housing to secure said caps on the housing, a reduced end portion on said caps extend-ing into the recesses of respective plugs, said reduced end portions forming an inwardly directed shoulder on said caps, a resilient seal-ing ring between the shoulders of said caps and the outer edges of respective plugs, screw means extending through said caps and en-gageable with respective plugs for securing the caps and plugs to-gether and also to compress said sealing rings for accomplishing a positive seal between said cap and said housing, a pair of ports located at opposite ends of said housing respectively to serve alternately as inlet and outlet ports, a piston assembly slidably mounted in said cylinder housing, means defining a slot extending longitudinally along one side of said housing, an arm on said piston assembly projecting through said slot and arranged to be connected to means to be driven, a flexible strip extending longitudinally of said housing interiorly thereof covering said slot from the inside and sealing the latter on opposite sides of said piston assembly by internal fluid pressure, means defining a groove in said piston assembly slidably engaging said strip, means anchoring one end of said strip to one of said caps, said strip at it send opposite from the anchored end having an aperture therein, and a leaf spring lever secured at one of its ends to the adjacent cap and having its other end engaged in said aperture, said other end extending toward said strip but normally positioned outwardly from said aperture longi-tudinally of the housing when not engaged in said aperture whereby said spring is flexed when engaged with said aperture and a tension-ing force is exerted and maintained on said strip for positive sealing by said strip.
2. The double acting cylinder of claim 1 wherein said anchor-ing means includes an anchored end aperture in said strip, and an anchor pin on said housing in hooking engagement with said anchored end aperture to removably hold said strip for tensioning by said leaf spring lever.
3. The double acting cylinder of claim 1 wherein said plugs and caps have longitudinal side grooves to receive said flexible strip, said sealing ring engaging said strip to provide a positive seal at said strip.
4. The double acting cylinder of claim 1 including a flexible dust cover on the exterior of said housing covering said slot and mounted by securement means, said cover having a longitudinal slit through which said arm moves.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US418564A US3893378A (en) | 1973-11-23 | 1973-11-23 | Double acting fluid cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1037360A true CA1037360A (en) | 1978-08-29 |
Family
ID=23658658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA213,360A Expired CA1037360A (en) | 1973-11-23 | 1974-11-08 | Double acting fluid cylinder |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3893378A (en) |
| JP (1) | JPS598686B2 (en) |
| CA (1) | CA1037360A (en) |
| DE (1) | DE2453948A1 (en) |
Families Citing this family (35)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2448028C2 (en) * | 1974-10-09 | 1982-12-02 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | Working cylinder for pneumatic or hydraulic pressure media |
| US4137827A (en) * | 1977-05-18 | 1979-02-06 | Hewitt Delbert C | Double acting fluid operated piston cylinder assembly |
| DE2904190A1 (en) * | 1979-02-05 | 1980-08-07 | Delbert C Hewitt | Double acting fluid operated piston cylinder assembly - has metal plates between angularly slotted portions of plastics piston body and clutch roller |
| DE2945133C2 (en) * | 1979-11-08 | 1983-09-01 | Robert Bosch Gmbh, 7000 Stuttgart | Braking device for fluid-driven, rodless working cylinders |
| US4373427A (en) * | 1980-01-31 | 1983-02-15 | Tol-O-Matic, Inc. | Fluid pressure cylinder |
| DE3124878C1 (en) * | 1981-06-25 | 1982-12-09 | Kaiser, Siegmund H., Ing.(grad.), 7440 Nürtingen | Pressure cylinder |
| US4664020A (en) * | 1981-06-25 | 1987-05-12 | Proma Produkt-Und Marketing Gesellschaft M.B.H. | Piston-cylinder structure |
| SE8107724L (en) * | 1981-12-22 | 1983-06-23 | Mecman Ab | DEVICE FOR A Piston Rod Loss PRESSURE CYLINDER |
| US4481869A (en) * | 1982-05-14 | 1984-11-13 | Greenco Corp. | Fluid operated device with improved sealing means |
| DE3410973C2 (en) * | 1984-03-24 | 1986-06-05 | Festo KG, 7300 Esslingen | Pressure medium-operated slide-like feed device |
| DE3411823A1 (en) * | 1984-03-30 | 1985-10-10 | Festo KG, 7300 Esslingen | GUIDE HOUSING FOR THE LINEAR MOVING OUTPUT PART OF A MOTOR TO BE TAPPED FROM THE FORCE |
| JPH033245Y2 (en) * | 1985-01-10 | 1991-01-28 | ||
| DE3504269A1 (en) * | 1985-02-08 | 1986-08-21 | ORIGA GmbH Pneumatik, 7024 Filderstadt | PRESSURE CYLINDER |
| JPH0433451Y2 (en) * | 1985-05-15 | 1992-08-11 | ||
| JPH0439446Y2 (en) * | 1985-10-23 | 1992-09-16 | ||
| JPS6285704U (en) * | 1985-11-15 | 1987-06-01 | ||
| DE3619473A1 (en) * | 1986-06-10 | 1987-12-17 | Knorr Bremse Ag | Pressure medium-driven, piston rod-less working cylinder |
| US4891908A (en) * | 1987-03-24 | 1990-01-09 | Aquilina Anthony G | Pneumatic door opener |
| US5040332A (en) * | 1988-07-08 | 1991-08-20 | Aquilina Anthony G | Pneumatic door operator |
| EP0385188A1 (en) * | 1989-02-28 | 1990-09-05 | Hygrama Ag | Pressure fluid actuator |
| US4998459A (en) * | 1989-09-22 | 1991-03-12 | Blatt John A | Rodless fluid actuated motor with improved sealing characteristics |
| US5125789A (en) * | 1990-01-02 | 1992-06-30 | Peerless Automation | Molded parts removal and transfer robot |
| DE4023058C2 (en) * | 1990-07-17 | 1994-08-18 | Mannesmann Ag | Rodless cylinder, especially for compressible media, with a braking device |
| DE9113492U1 (en) * | 1991-10-30 | 1993-03-04 | Robert Bosch Gmbh, 7000 Stuttgart | Single-acting pneumatic working cylinder |
| JP2548002Y2 (en) * | 1995-05-31 | 1997-09-17 | 豊和工業株式会社 | Guide rodless cylinder device |
| USD380042S (en) * | 1995-06-26 | 1997-06-17 | Yuda Lawrence F | Air cylinder housing |
| JP3160891B2 (en) * | 1997-04-29 | 2001-04-25 | 豊和工業株式会社 | Seal band mounting structure |
| TW494187B (en) * | 1997-06-11 | 2002-07-11 | Howa Machinery Ltd | A rodless power cylinder |
| JP3818752B2 (en) * | 1997-09-24 | 2006-09-06 | Ｓｍｃ株式会社 | Rodless cylinder |
| US5988042A (en) * | 1997-10-24 | 1999-11-23 | Phd, Inc. | Rodless cylinder with internal bearings |
| US6257123B1 (en) | 1997-10-24 | 2001-07-10 | Phd, Inc. | Rodless slides |
| JP3590966B2 (en) | 1999-02-22 | 2004-11-17 | 豊和工業株式会社 | Rodless cylinder |
| JP3759947B1 (en) | 2004-11-02 | 2006-03-29 | 株式会社コガネイ | Magnet type rodless cylinder |
| JP4813812B2 (en) * | 2005-03-15 | 2011-11-09 | 株式会社コガネイ | Magnet type rodless cylinder |
| JP5009106B2 (en) * | 2007-09-12 | 2012-08-22 | 株式会社アイ・アンド・ティー | Braking device for linear motion body |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1431084A (en) * | 1921-01-19 | 1922-10-03 | Ray E Anglemyer | Footboard attachment for automobiles |
| US1903168A (en) * | 1931-03-20 | 1933-03-28 | Zero Ice Corp | Pressure vessel for solid carbon dioxide |
| US2200427A (en) * | 1937-04-22 | 1940-05-14 | Merz Francesco | Propeller device |
| US2473430A (en) * | 1945-05-19 | 1949-06-14 | Le Roi Company | Piston coupling mechanism |
| US2486615A (en) * | 1948-04-23 | 1949-11-01 | Livingaire Inc | Piston and cylinder construction |
| US2686497A (en) * | 1950-05-29 | 1954-08-17 | Rhodes Lewis Co | Fluid pressure actuated mechanism |
| US2686493A (en) * | 1952-11-14 | 1954-08-17 | John E Neiswanger | Tire deflation indicator |
| US2835404A (en) * | 1956-08-13 | 1958-05-20 | Smith Corp A O | Pressure vessel |
| DE1044748B (en) * | 1957-08-30 | 1958-11-27 | Demag Ag | Hydraulic long stroke drive for machines, e.g. B. Bumpers |
| US3143181A (en) * | 1961-12-06 | 1964-08-04 | Continental Oil Co | Seismic transducer and cushioning device therefor |
| US3278153A (en) * | 1963-06-04 | 1966-10-11 | Gorman Rupp Ind Inc | Double action pinch tube valve |
| US3221610A (en) * | 1964-01-13 | 1965-12-07 | Hewitt | Clutch type piston locking means |
| US3414316A (en) * | 1966-10-13 | 1968-12-03 | Williams Oscar Stanley | Closure for tractor cabs |
| SE326376B (en) * | 1968-11-15 | 1970-07-20 | Mecmatic Ab | |
| US3549244A (en) * | 1969-01-27 | 1970-12-22 | Us Navy | Precision prism oscillating mechanism |
| DE2139504C3 (en) * | 1971-08-06 | 1979-06-28 | Fa. J. Eberspaecher, 7300 Esslingen | Heater for mobile units |
-
1973
- 1973-11-23 US US418564A patent/US3893378A/en not_active Expired - Lifetime
-
1974
- 1974-11-08 CA CA213,360A patent/CA1037360A/en not_active Expired
- 1974-11-14 DE DE19742453948 patent/DE2453948A1/en not_active Ceased
- 1974-11-25 JP JP49135836A patent/JPS598686B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS598686B2 (en) | 1984-02-27 |
| JPS5089775A (en) | 1975-07-18 |
| DE2453948A1 (en) | 1975-05-28 |
| US3893378A (en) | 1975-07-08 |
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