EP0431705B1 - Protected closing device - Google Patents
Protected closing device Download PDFInfo
- Publication number
- EP0431705B1 EP0431705B1 EP19900203194 EP90203194A EP0431705B1 EP 0431705 B1 EP0431705 B1 EP 0431705B1 EP 19900203194 EP19900203194 EP 19900203194 EP 90203194 A EP90203194 A EP 90203194A EP 0431705 B1 EP0431705 B1 EP 0431705B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit
- induction coil
- motor
- conductor
- power supply
- 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
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/40—Safety devices, e.g. detection of obstructions or end positions
- E05F15/42—Detection using safety edges
- E05F15/44—Detection using safety edges responsive to changes in electrical conductivity
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/40—Safety devices, e.g. detection of obstructions or end positions
- E05F15/42—Detection using safety edges
- E05F15/44—Detection using safety edges responsive to changes in electrical conductivity
- E05F2015/447—Detection using safety edges responsive to changes in electrical conductivity using switches in serial arrangement
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/40—Application of doors, windows, wings or fittings thereof for gates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/14—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for operation by a part of the human body other than the hand, e.g. by foot
- H01H3/141—Cushion or mat switches
- H01H2003/146—Cushion or mat switches being normally closed
Definitions
- the invention relates to a device for closing a passageway, which device comprises a closing body that can be moved by means of a motor along a guiding from a closed position to an open position and vice versa, wherein the body is provided with a safety sensor interrupting the motor power supply and incorporated in a circuit with separate power supply, said circuit being connected fixedly to the closing body, said circuit being provided with a conductor extending in the direction of movement, said conductor being guided slidably along fixed first and second induction coils disposed close to the guiding, said coils being connected with a control circuit for the motor, whereas said second induction coil is arranged as power supply for the circuit.
- Such a device is known from EP-A-0 316 691, said devices being frequently used in electrically driven doors such as elevator doors, fences for closing entrances, which doors or fences are provided on the end post with an end post sensor. Pressing in this end post sensor causes stopping of the drive motor, whereby people and objects cannot be pinned by the closing door or closing fence.
- the known systems operate on the measuring of a resistance or power change when the sensor is activated. These systems are very sensitive to the dimensions of the circuit and are therefore not universal for different applications.
- the invention has for its object to improve the safety system such that the above mentioned drawbacks do not occur.
- the device according to the invention is distinguished in that the safety sensor comprises one or more break contacts arranged in series, said one or more break contacts being connected in series with a capacitor in the circuit on the closing body, and wherein said first induction coil detects a frequency change, which is compared at the detection unit of the control circuit to a window value, such that at a lower or higher value than a maximum limit value or minimum limit value the motor is rendered inoperative.
- the invention is based on the idea that the frequency change has to be measured. Frequency measurements are generally much more sensitive than measurements of current, so that frequency measurements lead to an enhanced safety level.
- Shown in fig. 1 is a slide fence consisting of a main beam 1 through which are arranged bars 2 which are mutually coupled at the top by an upper beam 3.
- This whole rectangular construction is considered as a movable body which is reciprocally slidable in the direction of the arrow P1 relative to fixedly arranged posts 4 and 5.
- guide wheels 6, 7 are arranged in the posts 4 and 5, wherein wheel 7 is driven by an electric motor with transmission.
- Motor 8 is reversible so that the fence moves to the left in the one rotational direction of motor 8 and to the right in the other rotational direction in order respectively to close and open the passageway defined by post 4 and a fixed post 10.
- the end post 11 is embodied with a number of break contacts connected in series or otherwise in order to break an electric circuit.
- the known electric circuit is a component of a control circuit connected to the motor 8 so that a signal transfer has to be effected between the electric circuit part moving along with the fence 1 and the electric circuit part present on the post 5.
- the electric circuit according to the invention is elucidated in schematic form with reference to fig. 2.
- the end post 11 is embodied with a number of break contacts 12 connected in series which together with a conductor 13 form a closed circuit.
- the conductor 13 is shown schematically in fig. 1 with the broken line. This extends in the direction of movement P1 parallel to the beam 1.
- the lower conductor 14 is spanned such that it can be passed along two induction coils.
- a capacitor 15 is arranged at the connection to the end post safety conductor and the lower conductor 14.
- the induction coil 16 is connected to a detection unit 17 via a coupling block 18.
- the induction coil 16 has a core which extends in annular manner about conductor 14 and is provided with a number of windings.
- a second induction coil 19 is arranged which is fed by a voltage via coupling block 18.
- This induction coil also consists of a core provided with a number of windings, this such that when an alternating voltage or a pulsating direct voltage is applied a magnetic field is generated in said second induction coil 19 which excites a voltage in the electric circuit 13.
- a current will flow in the circuit formed by the lower conductor 14, the capacitor 15, the non-broken contacts 12 and subsequently to the conductor 13.
- This current is detected in the induction coil 16 which generates a determined frequency via the coupling block 18 to the detection unit.
- the detection unit 17 is connected to the control circuit for the drive motor 8.
- the above stated device operates as follows. In normal operation the electric circuit 13, 14 is closed because the break contacts 12 are all closed. When the motor 8 is energized the gate can therefore be closed and the conductor 14 will move freely along the induction coils 16, 19. As soon as an object or person is touched at the end post one of the break contacts 12 is opened and the electric circuit 13, 14 is broken. Current will no longer flow and the induction coil 16 no longer detects any frequency in the circuit, whereby a frequency change is transferred to the detection unit 17. This immediately renders the motor 8 inoperative via the associated control circuit.
- the capacitor 15 will then change the RC-value of the electric circuit due to the end strip break contacts 12 being rendered inoperative.
- the induction coil 16 detects a frequency change, which is compared at the detection unit 17 to a window value, whereby at a higher maximum limit value or a lower minimum limit value the motor 8 is rendered inoperative. Because the induction coil 16 preferably has more windings than induction coil 19, the frequency will be taken to a higher level so that the window values can be increased. Accuracy in detecting disturbances is herewith improved. Radio disturbances resulting from signals emitted by the electric circuit and signals received thereby are also eliminated. In this way the system is also protected within itself.
- Fig. 3 shows another embodiment, wherein the moving body is formed by a roll-down door consisting of a number of mutually pivotable slats 21 whereof the head ends are received in a guiding 22.
- a roll-down door consisting of a number of mutually pivotable slats 21 whereof the head ends are received in a guiding 22.
- guide rollers or drive rollers 24 Arranged at the top of the passage opening 23 are guide rollers or drive rollers 24, wherein the guiding 22 continues further in horizontal direction.
- the slats 21 can therefore run through a curved path and, depending on the drive direction of the rollers 24, can be moved in upward or downward direction according to arrow P2.
- the moving body can also be provided here with a bottom strip 11' provided with break contacts 12' forming part of an electric circuit 13, 14.
- the conductor 13 can herein be adhered fixedly to the slats 21 so that it can move along hingeably with these slats 21, while the other conductor 14 extends freely along the head end of slats 21.
- This conductor has to be provided with a guide wheel similar to wheel 24.
- the conductor 14 is here also carried along two induction coils 16, 19 which are connected to a detection unit 17 via a coupling block 18.
- Detection unit 17 controls the drive motor 8' in the extension of the rotational shaft for the guide drive wheels 24.
- the invention is not limited to the above described embodiments.
- the annular shaped coil(s) can for instance be replaced by any other suitably shaped coil at the conductor 14.
Landscapes
- Power-Operated Mechanisms For Wings (AREA)
Description
- The invention relates to a device for closing a passageway, which device comprises a closing body that can be moved by means of a motor along a guiding from a closed position to an open position and vice versa, wherein the body is provided with a safety sensor interrupting the motor power supply and incorporated in a circuit with separate power supply, said circuit being connected fixedly to the closing body, said circuit being provided with a conductor extending in the direction of movement, said conductor being guided slidably along fixed first and second induction coils disposed close to the guiding, said coils being connected with a control circuit for the motor, whereas said second induction coil is arranged as power supply for the circuit.
- Such a device is known from EP-A-0 316 691, said devices being frequently used in electrically driven doors such as elevator doors, fences for closing entrances, which doors or fences are provided on the end post with an end post sensor. Pressing in this end post sensor causes stopping of the drive motor, whereby people and objects cannot be pinned by the closing door or closing fence. The known systems operate on the measuring of a resistance or power change when the sensor is activated. These systems are very sensitive to the dimensions of the circuit and are therefore not universal for different applications.
- The invention has for its object to improve the safety system such that the above mentioned drawbacks do not occur.
- The device according to the invention is distinguished in that the safety sensor comprises one or more break contacts arranged in series, said one or more break contacts being connected in series with a capacitor in the circuit on the closing body, and wherein said first induction coil detects a frequency change, which is compared at the detection unit of the control circuit to a window value, such that at a lower or higher value than a maximum limit value or minimum limit value the motor is rendered inoperative.
- The invention is based on the idea that the frequency change has to be measured. Frequency measurements are generally much more sensitive than measurements of current, so that frequency measurements lead to an enhanced safety level.
- According to a further feature of the invention it is recommended to have the number of windings on the first induction coil differ from that of the windings on the second induction coil.
- Above mentioned features of the invention will be further elucidated in the figure description hereinafter of a number of embodiments. In the drawing:
- Fig. 1 shows a perspective view of a sliding gate which serves to close off a roadway,
- fig. 2 is a schematic survey of the circuit in the movable body and the control circuit for the drive motor,
- fig. 3 is a perspective view of a movable body in the form of a drop door for closing an access opening.
- Shown in fig. 1 is a slide fence consisting of a main beam 1 through which are arranged bars 2 which are mutually coupled at the top by an upper beam 3. This whole rectangular construction is considered as a movable body which is reciprocally slidable in the direction of the arrow P1 relative to fixedly arranged
posts 4 and 5. For this purpose guide wheels 6, 7 are arranged in theposts 4 and 5, wherein wheel 7 is driven by an electric motor with transmission. Motor 8 is reversible so that the fence moves to the left in the one rotational direction of motor 8 and to the right in the other rotational direction in order respectively to close and open the passageway defined by post 4 and afixed post 10. There is a danger here that people or objects can get caught between theend post 11 of the fence and the fixedpost 10. As is known, theend post 11 is embodied with a number of break contacts connected in series or otherwise in order to break an electric circuit. The known electric circuit is a component of a control circuit connected to the motor 8 so that a signal transfer has to be effected between the electric circuit part moving along with the fence 1 and the electric circuit part present on thepost 5. - The electric circuit according to the invention is elucidated in schematic form with reference to fig. 2. As stated above, the
end post 11 is embodied with a number ofbreak contacts 12 connected in series which together with aconductor 13 form a closed circuit. Theconductor 13 is shown schematically in fig. 1 with the broken line. This extends in the direction of movement P1 parallel to the beam 1. Along at least one portion of the electric circuit in fig. 2 thelower conductor 14 is spanned such that it can be passed along two induction coils. In addition acapacitor 15 is arranged at the connection to the end post safety conductor and thelower conductor 14. Theinduction coil 16 is connected to a detection unit 17 via acoupling block 18. Theinduction coil 16 has a core which extends in annular manner aboutconductor 14 and is provided with a number of windings. - A
second induction coil 19 is arranged which is fed by a voltage viacoupling block 18. This induction coil also consists of a core provided with a number of windings, this such that when an alternating voltage or a pulsating direct voltage is applied a magnetic field is generated in saidsecond induction coil 19 which excites a voltage in theelectric circuit 13. As a result of this voltage a current will flow in the circuit formed by thelower conductor 14, thecapacitor 15, the non-broken contacts 12 and subsequently to theconductor 13. This current is detected in theinduction coil 16 which generates a determined frequency via thecoupling block 18 to the detection unit. - It will be apparent that when the gate is moved in the direction of the arrow P1 the
lower conductor 14 can move freely along theinduction coils - The above stated device operates as follows. In normal operation the
electric circuit break contacts 12 are all closed. When the motor 8 is energized the gate can therefore be closed and theconductor 14 will move freely along theinduction coils break contacts 12 is opened and theelectric circuit induction coil 16 no longer detects any frequency in the circuit, whereby a frequency change is transferred to the detection unit 17. This immediately renders the motor 8 inoperative via the associated control circuit. - If no voltage is carried to the
induction coil 19 as a consequence of a disturbance, no current is excited in thecircuit - If a short-circuit occurs outside the
end strip 11, for instance between theconductors capacitor 15 will then change the RC-value of the electric circuit due to the endstrip break contacts 12 being rendered inoperative. Theinduction coil 16 detects a frequency change, which is compared at the detection unit 17 to a window value, whereby at a higher maximum limit value or a lower minimum limit value the motor 8 is rendered inoperative. Because theinduction coil 16 preferably has more windings thaninduction coil 19, the frequency will be taken to a higher level so that the window values can be increased. Accuracy in detecting disturbances is herewith improved. Radio disturbances resulting from signals emitted by the electric circuit and signals received thereby are also eliminated. In this way the system is also protected within itself. - Fig. 3 shows another embodiment, wherein the moving body is formed by a roll-down door consisting of a number of mutually
pivotable slats 21 whereof the head ends are received in a guiding 22. Arranged at the top of the passage opening 23 are guide rollers ordrive rollers 24, wherein the guiding 22 continues further in horizontal direction. Theslats 21 can therefore run through a curved path and, depending on the drive direction of therollers 24, can be moved in upward or downward direction according to arrow P2. The moving body can also be provided here with a bottom strip 11' provided with break contacts 12' forming part of anelectric circuit conductor 13 can herein be adhered fixedly to theslats 21 so that it can move along hingeably with theseslats 21, while theother conductor 14 extends freely along the head end ofslats 21. This conductor has to be provided with a guide wheel similar towheel 24. Theconductor 14 is here also carried along twoinduction coils coupling block 18. - Detection unit 17 controls the drive motor 8' in the extension of the rotational shaft for the
guide drive wheels 24. - The operation of this embodiment is otherwise the same as that of the above described embodiments.
- The invention is not limited to the above described embodiments. The annular shaped coil(s) can for instance be replaced by any other suitably shaped coil at the
conductor 14.
Claims (2)
- A device for closing a passageway, which device comprises a closing body (1, 2, 3) that can be moved by means of a motor (8) along a guiding (4, 5) from a closed position to an open position and vice versa, wherein the body (1, 2, 3) is provided with a safety sensor interrupting the motor power supply and incorporated in a circuit with separate power supply, said circuit being connected fixedly to the closing body (1, 2, 3), said circuit being provided with a conductor (14) extending in the direction of movement, said conductor (14) being guided slidably along fixed first and second induction coils (16, 19) disposed close to the guiding (4, 5), said coils (16, 19) being connected with a control circuit (17, 18) for the motor (8), whereas said second induction coil (19) is arranged as power supply for the circuit, characterized in that the safety sensor comprises one or more break contacts (12) arranged in series, said one or more break contacts being connected in series with a capacitor (15) in the circuit on the closing body, and wherein said first induction coil (16) detects a frequency change, which is compared at the detection unit (17) of the control circuit to a window value, such that at a lower or higher value than a maximum limit value or minimum limit value the motor (8) is rendered inoperative.
- A device as claimed in claim 1, characterized in that the number of windings on the first induction coil (16) differs from that of the windings on the second induction coil (19).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8902976 | 1989-12-01 | ||
NL8902976A NL8902976A (en) | 1989-12-01 | 1989-12-01 | SECURE CLOSING DEVICE. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0431705A1 EP0431705A1 (en) | 1991-06-12 |
EP0431705B1 true EP0431705B1 (en) | 1994-12-07 |
Family
ID=19855734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900203194 Expired - Lifetime EP0431705B1 (en) | 1989-12-01 | 1990-12-03 | Protected closing device |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0431705B1 (en) |
DE (1) | DE69014838T2 (en) |
DK (1) | DK0431705T3 (en) |
ES (1) | ES2064606T3 (en) |
NL (1) | NL8902976A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL9401929A (en) * | 1994-11-18 | 1996-07-01 | Nedap Nv | Reliable anti-squeeze system |
DE19606745C2 (en) * | 1996-02-23 | 1998-12-03 | Wampfler Ag | Closing edge safety device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3008597C2 (en) * | 1980-03-06 | 1982-02-25 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Safety circuit for a door leaf attached to a driven traction mechanism |
SE447603B (en) * | 1985-04-02 | 1986-11-24 | Jonsson Bert | SAFETY ARRANGEMENTS FOR DEVICE FOR INDICATING PRESSURE OR POWER ON EXV PRESSURE BUTTONS, EDGE PROTECTOR ON GATES, TRAMMATOR OR GENERAL POSITION DETECTION |
DE3738830C1 (en) * | 1987-11-16 | 1989-02-09 | Thyssen Industrie | Device for monitoring the closing state of a closure member |
-
1989
- 1989-12-01 NL NL8902976A patent/NL8902976A/en not_active Application Discontinuation
-
1990
- 1990-12-03 DK DK90203194T patent/DK0431705T3/en active
- 1990-12-03 DE DE1990614838 patent/DE69014838T2/en not_active Expired - Fee Related
- 1990-12-03 EP EP19900203194 patent/EP0431705B1/en not_active Expired - Lifetime
- 1990-12-03 ES ES90203194T patent/ES2064606T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2064606T3 (en) | 1995-02-01 |
DK0431705T3 (en) | 1995-05-08 |
DE69014838T2 (en) | 1995-05-04 |
NL8902976A (en) | 1991-07-01 |
EP0431705A1 (en) | 1991-06-12 |
DE69014838D1 (en) | 1995-01-19 |
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