EP1284372B1 - Pressure fluid cylinder and position indicating device - Google Patents
Pressure fluid cylinder and position indicating device Download PDFInfo
- Publication number
- EP1284372B1 EP1284372B1 EP20020445099 EP02445099A EP1284372B1 EP 1284372 B1 EP1284372 B1 EP 1284372B1 EP 20020445099 EP20020445099 EP 20020445099 EP 02445099 A EP02445099 A EP 02445099A EP 1284372 B1 EP1284372 B1 EP 1284372B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- cylinder
- light
- pressure fluid
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means
-
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
Definitions
- the invention concerns an indicating device according to the preamble of claim 1.
- the invention also concerns a pressure fluid cylinder according to the preamble of claim 7.
- pressure fluid cylinders of the kind including a cylinder tube and a moveable piston
- sensors for detecting, for example, an end position of the piston inside the cylinder.
- the supply to the cylinder may be controlled so that the piston is brought to a stop or be reversed.
- a light source which is activated by the sensor and may be perceived by an operator in order to facilitate adjustment etc.
- a device is previously known from WO 00/68579, wherein switches may be installed in axial channels in the cylinder tube wall and over cables be arranged to activate a light source, which is positioned in a cylinder end wall as a response to the presence of a piston with a built-in magnet.
- This device is complicated as to its construction and necessitates drawing of cables to the fixed light source.
- EP 676550 discloses an indicating device according to the preamble of claim 1.
- the axial channels for receiving the sensor elements are covered with optically transparent band allowing a visual indication radially through each band.
- the long joints between the bands and the channel walls make this solution exposed to leakage.
- the light source being a light emitting diode
- the light transmitting element including a reflecting mirror surface for the transmission of light at an angle to the extension direction of the channel, it is achieved that the indication will be clearly visible from the side of the cylinder at a right angle to its axis, which is normally the prevailing looking direction when controlling the cylinder.
- a pressure fluid cylinder 1 including a cylinder tube 2 and two cylinder end walls 3 and 4. Inside the cylinder tube 2 a piston 5 is axially moveable, and is attached to a piston rod 6, which is sealingly extending through the cylinder end wall 4.
- an axial channel 7 for receiving a sensor unit 8, which includes on the one hand a piston position sensor in the form of an electrical or mechanical switch (per see known and therefore not shown) with the ability to sense when the piston 5 is in a close position, on the other hand a light source in the form of a light emitting diode.
- a sensor unit 8 which includes on the one hand a piston position sensor in the form of an electrical or mechanical switch (per see known and therefore not shown) with the ability to sense when the piston 5 is in a close position, on the other hand a light source in the form of a light emitting diode.
- Light emanating from the light source is indicated at 9 and radiates axially through the axial channel 7 when the piston position sensor is activated.
- the light 9 meets a light transmitting element 10, which has an essentially plane entrance surface 11 for light and a reflecting prism surface 22 at essentially 45° with respect to the extension direction of the channel 7.
- the element 10 is mounted sealingly in the end wall 4 with the aid of a per se known sealing device or possibly direct sealing against the end wall.
- the axial channel 7 continues also through the cylinder end wall 3, through which cabling 13 to the sensor unit 8 extends, so as to penetrate a packing at the mouth of the channel, said packing 14 on the one hand operating as a sealing device for the channel, on the other hand may be functioning as a fixation device for the sensor unit 8.
- This may be obtained by having a pressing screw 15 being arranged outside the packing 14, said screw when screwing it inwards pressing the packing 14 such that it will sealingly and fixingly adjoin to the cable comprising the cabling 13. If the sensor unit 8 is to be adjusted, the screw 15 is loosened, whereby the packing 14 is relieved, allowing displacement of the cable comprising the cabling 13 and thereby axial adjustment of the sensor unit 8.
- a light transmitting element 16 being position in an axial continuation of the channel 7.
- Light emanating from the light source in the sensor unit will in this case be emitted essentially axially, let be scattered, over a convex surface 17 belonging to the light transmitting element 16, so as to be best visible from the end of the pressure fluid cylinder, but to a certain degree, due to the convex surface 17, also from the side of the cylinder.
- Fig. 1 there is also indicated a ring shaped magnet 18, which is of a per se previously known kind, and which is positioned centrally as seen axially and at the outer portion of the piston 5 as seen radially.
- the piston with the associated magnet is located in a position adjacent to the sensor unit 8, in which position this piston position sensor with the associated micro-switch and light source is activated.
- the pressure fluid cylinder 1 is provided with two channels 7 and 7', whereof the latter receives a second piston position sensor 8', which is provided with an associated cabling 13' and associated light transmitting element 10'.
- This embodiment allows for the pistons two end positions to be detected and indicated.
- the invention may be modified within the scope of the annexed claims and in particularly the separate elements such as switch and light source be otherwise and also be assembled otherwise than what is indicated above.
- the light source must not be mounted with the piston position sensor to a sensor unit, these means may be connected to each other but be separated axially and sideways.
- the light transmitting elements may be constructed otherwise and as an example also come from lead-through holes in the cylinder tube itself. It is also possible to use light-guides of fibreglass for directing light as an alternative to the shown embodiment.
- the cable should be rigid in order to facilitate positioning in the channel and its thickness should not deviate too much from the dimension of the channel so as to avoid sideways movements of the cable inside the channel. Also other methods for positioning the sensor unit inside the channel than what is shown are within the scope the invention, for example with a displacement tool in order to press the sensor unit in an axial direction.
- the invention is applicable in all kinds of pressure fluid cylinders, also with rod-less slot cylinders.
- the magnet may be position otherwise than axially central in the piston, for example at one axial end of the piston.
- the cylinder tube 2 is made from a non magnetic material such as aluminium or an aluminium alloy for allowing the magnetic field from the magnet in the piston to have effect through the material.
- An advantage with aluminium or the like is that light emanating from the light source without greater losses will be reflected in the walls of the axial channel if the cylinder tube is manufactured through a extrusion procedure, wherein shiny channel walls will be obtained.
Description
- The invention concerns an indicating device according to the preamble of claim 1. The invention also concerns a pressure fluid cylinder according to the preamble of
claim 7. - It is previously known from pressure fluid cylinders, of the kind including a cylinder tube and a moveable piston, to arrange sensors for detecting, for example, an end position of the piston inside the cylinder. As a response to a signal from the piston position sensor, for example, the supply to the cylinder may be controlled so that the piston is brought to a stop or be reversed. It is also known to visually indicate when the piston is positioned near the piston position sensor by the sensor also controlling a light source, which is activated by the sensor and may be perceived by an operator in order to facilitate adjustment etc.
- A device according to the above is previously known from WO 00/68579, wherein switches may be installed in axial channels in the cylinder tube wall and over cables be arranged to activate a light source, which is positioned in a cylinder end wall as a response to the presence of a piston with a built-in magnet. This device is complicated as to its construction and necessitates drawing of cables to the fixed light source.
- In another previously known pressure air cylinder which is described in DE-A1-41 37 586, a control lamp is arranged on a housing which is movable outside the cylinder tube wall. This solution is unsuitable in many applications where hygiene is important, since the outside positioned housing collects dirt and makes cleaning seriously difficult.
- EP 676550 discloses an indicating device according to the preamble of claim 1. The axial channels for receiving the sensor elements are covered with optically transparent band allowing a visual indication radially through each band. The long joints between the bands and the channel walls make this solution exposed to leakage.
- It is an aim of this invention to overcome the problems of the known art and to provide an indicating device, which with simple means provides a visual indication of a piston position, which allows high hygienic standard and is uncomplicated.
- These aims are achieved in an indicating device as above through the features of the characterizing portion of claim 1. Corresponding aims are achieved in a pressure fluid cylinder as above through the features of the characterizing portion of
claim 7. - Hereby the number of units to be assembled is reduced; drawing of cables is simplified and gives possibilities of high hygienic standard with respect of the outside of the pressure fluid cylinder. Adjustment of the piston position sensor is simplified and the pressure fluid cylinder may be produced to a relatively low cost.
- By the light source being a light emitting diode, a solution which saves space and current is achieved.
- By constructing the light transmitting element sealingly against the wall of the pressure fluid cylinder is also ensured, besides high hygienic standard, protection of the sensor unit against the influence of water or the like.
- By the light transmitting element including a reflecting mirror surface for the transmission of light at an angle to the extension direction of the channel, it is achieved that the indication will be clearly visible from the side of the cylinder at a right angle to its axis, which is normally the prevailing looking direction when controlling the cylinder.
- Further advantages are achieved with further features of the invention and will become evident from the following detailed description of embodiments at the background of the annexed drawing.
- The drawing shows:
- Fig. 1 a section through a pressure fluid cylinder according to the invention, and
- Fig. 2 a side view of the cylinder in Fig. 1 with details indicated with interrupted lines.
-
- In Fig. 1 is shown a pressure fluid cylinder 1 including a
cylinder tube 2 and twocylinder end walls 3 and 4. Inside the cylinder tube 2 a piston 5 is axially moveable, and is attached to apiston rod 6, which is sealingly extending through the cylinder end wall 4. - In the wall of the
cylinder tube 2 there is arranged anaxial channel 7 for receiving asensor unit 8, which includes on the one hand a piston position sensor in the form of an electrical or mechanical switch (per see known and therefore not shown) with the ability to sense when the piston 5 is in a close position, on the other hand a light source in the form of a light emitting diode. Light emanating from the light source is indicated at 9 and radiates axially through theaxial channel 7 when the piston position sensor is activated. At the end of thechannel 7, which also has a continuation in the cylinder end wall 4, thelight 9 meets alight transmitting element 10, which has an essentiallyplane entrance surface 11 for light and a reflectingprism surface 22 at essentially 45° with respect to the extension direction of thechannel 7. Light entering through thesurface 11 and meeting theprism surface 22 will be reflected at the angle of 90° and led through thelight transmitting element 10 to the outside of the pressure fluid cylinder 1 over aconvex surface 12, which operates so as to spread light. Theelement 10 is mounted sealingly in the end wall 4 with the aid of a per se known sealing device or possibly direct sealing against the end wall. - At the other side of the pressure fluid cylinder, the
axial channel 7 continues also through thecylinder end wall 3, through which cabling 13 to thesensor unit 8 extends, so as to penetrate a packing at the mouth of the channel, said packing 14 on the one hand operating as a sealing device for the channel, on the other hand may be functioning as a fixation device for thesensor unit 8. This may be obtained by having apressing screw 15 being arranged outside thepacking 14, said screw when screwing it inwards pressing thepacking 14 such that it will sealingly and fixingly adjoin to the cable comprising thecabling 13. If thesensor unit 8 is to be adjusted, thescrew 15 is loosened, whereby thepacking 14 is relieved, allowing displacement of the cable comprising thecabling 13 and thereby axial adjustment of thesensor unit 8. - At the right side, as seen in Fig. 1, there is indicated with interrupted lines an alternative embodiment with a
light transmitting element 16 being position in an axial continuation of thechannel 7. Light emanating from the light source in the sensor unit will in this case be emitted essentially axially, let be scattered, over aconvex surface 17 belonging to thelight transmitting element 16, so as to be best visible from the end of the pressure fluid cylinder, but to a certain degree, due to theconvex surface 17, also from the side of the cylinder. - In Fig. 1 there is also indicated a ring shaped
magnet 18, which is of a per se previously known kind, and which is positioned centrally as seen axially and at the outer portion of the piston 5 as seen radially. At 19 is indicated that the piston with the associated magnet is located in a position adjacent to thesensor unit 8, in which position this piston position sensor with the associated micro-switch and light source is activated. - In the side view in Fig. 2 it is shown, and which must be considered as normal, that the pressure fluid cylinder 1 is provided with two
channels 7 and 7', whereof the latter receives a second piston position sensor 8', which is provided with an associated cabling 13' and associated light transmitting element 10'. This embodiment allows for the pistons two end positions to be detected and indicated. - The invention may be modified within the scope of the annexed claims and in particularly the separate elements such as switch and light source be otherwise and also be assembled otherwise than what is indicated above. As an example, the light source must not be mounted with the piston position sensor to a sensor unit, these means may be connected to each other but be separated axially and sideways. The light transmitting elements may be constructed otherwise and as an example also come from lead-through holes in the cylinder tube itself. It is also possible to use light-guides of fibreglass for directing light as an alternative to the shown embodiment.
- The cable should be rigid in order to facilitate positioning in the channel and its thickness should not deviate too much from the dimension of the channel so as to avoid sideways movements of the cable inside the channel. Also other methods for positioning the sensor unit inside the channel than what is shown are within the scope the invention, for example with a displacement tool in order to press the sensor unit in an axial direction.
- Finally, it may be mentioned that the invention is applicable in all kinds of pressure fluid cylinders, also with rod-less slot cylinders. The magnet may be position otherwise than axially central in the piston, for example at one axial end of the piston. It may be mentioned that the
cylinder tube 2 is made from a non magnetic material such as aluminium or an aluminium alloy for allowing the magnetic field from the magnet in the piston to have effect through the material. An advantage with aluminium or the like is that light emanating from the light source without greater losses will be reflected in the walls of the axial channel if the cylinder tube is manufactured through a extrusion procedure, wherein shiny channel walls will be obtained.
Claims (10)
- Indicating device for indicating the position of a piston (5) inside a cylinder tube (2) of a pressure fluid cylinder (1), said indicating device including on the one hand a piston position sensor for fastening in a chosen position along the length of the cylinder tube for detecting the presence of the piston in said position, on the other hand a light source for activation and indicating when the piston is present in said position, wherein the light source is connected to the piston position sensor for forming a sensor unit (8), wherein the sensor unit (8) is arranged to be fastenable in an axially extending channel (7) in the wall of the cylinder tube, and wherein a light transmitting element (10;16) is arranged for emitting light from the sensor unit to the outside of the pressure fluid cylinder,
characterized inthat the light source is arranged for transmitting light axially through the channel,that the light transmitting element (10;16) is arranged for placement at an axial position of said channel and that it includes means for transmitting light in directions at an angle to the axial extension direction of the channel. - Device according to claim 1, characterized in that the light source is a light emitting diode.
- Device according to claim 1 or 2, characteriz-ed in that the light transmitting element (10;16) is comprised of an element to be sealingly applied to the wall of the pressure fluid cylinder.
- Device according to claim 1, 2 or 3,
characterized in that the light transmitting element (10) includes a reflecting surface (22) for transmitting light in directions at an angle to the extension direction of the channel. - Device according to claim 4, characterized in that the reflecting surface (22) is a prism surface.
- Device according to any of the claims 1 - 5,
characterized in that the sensor unit (8) includes a magnetically operated switch. - Pressure fluid cylinder (1) including a cylinder tube (2) with a piston (5) moveable therein along an axis of the cylinder tube and including an indicating device (8,10) according to any one of the claims 1 - 6.
- Cylinder according to claim 7,
characterized in a packing (14) for sealing between a wall (3) of the pressure fluid cylinder and cabling (13) associated with the sensor unit (8). - Cylinder according to claim 7 or 8,
characterized in that the piston (5) is provided with at least one permanent magnet (18). - Cylinder according to any of the claims 7 - 9,
characterized in that it includes plural indicating devices (8,10;16) for indicating different piston positions.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0102723A SE0102723L (en) | 2001-08-15 | 2001-08-15 | Pressure fluid cylinder and indicating device therefore |
SE0102723 | 2001-08-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1284372A1 EP1284372A1 (en) | 2003-02-19 |
EP1284372B1 true EP1284372B1 (en) | 2005-09-14 |
Family
ID=20285031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20020445099 Expired - Lifetime EP1284372B1 (en) | 2001-08-15 | 2002-07-25 | Pressure fluid cylinder and position indicating device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1284372B1 (en) |
DE (1) | DE60206115D1 (en) |
SE (1) | SE0102723L (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10306461B4 (en) * | 2003-02-17 | 2007-06-14 | Imi Norgren Gmbh | Fluid actuated working cylinder |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01170801A (en) * | 1987-12-25 | 1989-07-05 | Ckd Corp | Piston position detector for hydraulic cylinder |
DE4027199A1 (en) * | 1990-08-28 | 1991-01-03 | Siemens Ag | Arrangement for continuously measuring position of moving body - has digital scale on cylindrical hollow chamber wall, and optical measurement head |
DE4137586A1 (en) | 1991-11-15 | 1993-05-19 | Frank Rueger | Detector for sensing magnetic piston position in cylinder - uses two magnetic sensors, one mother sensor acting as a distribution device for transfer of signals to computer |
DE4408639C2 (en) * | 1994-03-09 | 1998-04-16 | Mannesmann Ag | Working cylinder with a cylinder housing profile |
DE19921474A1 (en) | 1999-05-08 | 2001-01-18 | Festo Ag & Co | Display device |
-
2001
- 2001-08-15 SE SE0102723A patent/SE0102723L/en not_active IP Right Cessation
-
2002
- 2002-07-25 EP EP20020445099 patent/EP1284372B1/en not_active Expired - Lifetime
- 2002-07-25 DE DE60206115T patent/DE60206115D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1284372A1 (en) | 2003-02-19 |
SE517799C2 (en) | 2002-07-16 |
SE0102723D0 (en) | 2001-08-15 |
SE0102723L (en) | 2002-07-16 |
DE60206115D1 (en) | 2005-10-20 |
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