WO2002001588A1 - Limiting device and actuating element for use therein - Google Patents

Limiting device and actuating element for use therein Download PDF

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Publication number
WO2002001588A1
WO2002001588A1 PCT/NL2001/000485 NL0100485W WO0201588A1 WO 2002001588 A1 WO2002001588 A1 WO 2002001588A1 NL 0100485 W NL0100485 W NL 0100485W WO 0201588 A1 WO0201588 A1 WO 0201588A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
actuating elements
actuating
limiting device
movable
Prior art date
Application number
PCT/NL2001/000485
Other languages
French (fr)
Inventor
Leo Nugteren
Original Assignee
Ridder Aandrijfsystemen B.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ridder Aandrijfsystemen B.V. filed Critical Ridder Aandrijfsystemen B.V.
Priority to AU69617/01A priority Critical patent/AU6961701A/en
Publication of WO2002001588A1 publication Critical patent/WO2002001588A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/10—Movable parts; Contacts mounted thereon
    • H01H19/14—Operating parts, e.g. turn knob
    • H01H19/18—Operating parts, e.g. turn knob adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • H01H19/186—Operating parts, e.g. turn knob adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift with travelling nuts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button
    • H01H13/18—Operating parts, e.g. push-button adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • H01H13/186—Operating parts, e.g. push-button adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift wherein the pushbutton is rectilinearly actuated by a lever pivoting on the housing of the switch

Definitions

  • the invention relates to a device for limiting a movement of a member driven by a motor, comprising at least two switches connected to a circuit of the motor and movable actuating elements driven by the motor and co-acting with the switches.
  • a limiting device is marketed by applicant under the name "end switching system” , and is for instance used in drive systems for ventilating glasshouses.
  • a precisely controlled climate must be maintained in glasshouses in order to ensure optimal conditions for growth of the products cultivated therein.
  • the cost of setting and maintaining such a climate must be minimal.
  • the opening and closing of ventilating openings, such as windows, is therefore centrally controlled by a climate computer. This is also the case for the opening and closing of insulating energy screens arranged in the top of the glasshouse.
  • the climate computer herein actuates a drive system for the ventilation which consists of rack-pinion combinations which are connected to the windows and driven by shafts, which are connected in turn to drive motors, usually via a motor reductor.
  • the computer actuates a drive system for the energy screens .
  • This drive system is formed by winding shafts, onto which the screens are wound or from which they are unwound, and which are likewise driven by motors, optionally via drive shafts and reductors .
  • the motor reductors are provided with end switches . These switches are connected to an external relay which is arranged in the circuit of the motor.
  • the end switches take a dual form.
  • the operation end switch which during normal use stops the motor, and thereby also the whole drive, via its external relay, there is also provided a safety end switch which is arranged a small distance from the operation end switch and likewise co-acts with an external relay. This safety relay ensures an interruption of the power supply to the motor, so that the driving will still come to a stop.
  • the known end switching system of applicant is a rotating end switching system, wherein the end switches are operated by nuts which are arranged on a threaded spindle driven by the motor reductor. Both these nuts, one for each end position, are locked against rotation by means of adjusting screws which are screwed therein and which are placed between two guide members.
  • the nuts will hereby perform a rectilinear movement along the threaded spindle when this spindle is rotated. If however this rectilinear movement is blocked, for instance because the nut comes into contact with a stop, the nut is forced to co-rotate with the threaded spindle. Owing to this rotation the adjusting screws come into engagement with actuating elements, which in turn actuate the end switches .
  • each leaf spring herein takes a bent and stepped form.
  • This stepped outer end defines a first part which co-acts with the operation end switch and a second part which co-acts with the safety end switch.
  • the known limiting device has the drawback that the distance between the actuating elements formed by the stepped end part of the leaf spring is relatively small. There is hereby the risk of the safety end switch being actuated unintentionally when, as a result of the mass inertia, the different components of the drive system do not come to an immediate stop after the motor reductor has stopped. When this happens, it is first necessary to run through the reset procedure before the drive system can be restarted. This is laborious and time-consuming.
  • the invention now has for its object to provide a limiting device of the above described type wherein this drawback does not occur.
  • a structurally simple embodiment of the limiting device is obtained when the actuating elements are movable by a joint drive element connected to the motor.
  • the movability of the actuating elements can be achieved in simple manner by giving them a resiliently deformable form.
  • the actuating elements can herein have a differing stiffness .
  • the actuating elements preferably form part of a single resiliently deformable actuating member and have a different thickness. This can be realized in simple manner if the actuating member is a leaf spring, which has an incision from an outer end which mutually separates the actuating elements.
  • the invention also relates to an actuating element for use in a limiting device as described above.
  • Figure 1 is a partly cut-away perspective view of a drive system with a limiting device according to the invention
  • Figure 2 is a partly cut-away perspective view of the limiting device of figure 1,
  • Figure 3 shows a cross-section along line III- III in figure 2
  • Figures 4 and 5 show the actuation of respectively the operation end switch and the safety end switch.
  • a drive system 1 (figure 1) comprises an electric motor 2, a reductor 3 and a limiting device 4 connected thereto.
  • Limiting device 4 serves to stop motor 2 when the windows and/or screens controlled by drive system 1 have reached one of their end positions.
  • Device 4 comprises a housing 7 arranged on reductor casing 3.
  • a threaded spindle 8 is mounted rotatably in housing 7. This threaded spindle 8 is driven by reductor 3 via a gear transmission (not shown here) .
  • Limiting device 4 further comprises two sets of end switches 15,16.
  • End switch 15 is connected to an external relay (not shown here) , whereby in normal operation the motor 2 is stopped when an end position is reached.
  • End switch 16 forms an additional safety, and is only actuated if drive system 1 continues to run when this is not intended. This may be the result of a malfunction in end switch 15 or the relay connected thereto, of an incorrect connection or of any other cause.
  • the safety end switch 16 is likewise connected to a relay (not shown) which interrupts the power supply to motor 2.
  • End switches 15,16 are provided with switch levers 17,18 which are in engagement with the movable actuating elements 13,14.
  • these actuating elements 13,14 take a resiliently deformable form, and are clamped between switch levers 17,18 on one side and a protrusion 19 in a wall of housing 7 on the other.
  • Actuating elements 13,14 are herein tensioned around a pin 20 in housing 7. Actuating elements 13,14 are movable substantially independently of each other so as to thus create sufficient space between the moment of actuation of operation end switch 15 on the one hand and safety end switch 16 on the other.
  • actuating elements 13,14 are integrated into a single actuating member 21, here a leaf spring, the independent movability is herein ensured in that the actuating elements 13,14 are mutually separated by an incision 22 extending over a part of the length of leaf spring 21.
  • actuating elements 13,14 are further enhanced in that they here have a differing bending stiffness. Since the actuating elements 13,14 are integrated in the shown embodiment, this difference is created by a difference in the thickness or, rather, width of elements 13,14. This difference is achieved in that the incision 22 is formed from the centre as seen in width direction.
  • limiting device 4 The operation of limiting device 4 according to the invention is now as follows.
  • the motor 2 When the motor 2 is running the threaded spindle 8 is rotated by reductor 3.
  • Nuts 9 herein perform a rectilinear movement because the protruding adjusting screws 11 are guided between the two leaf springs 21.
  • Adjusting screw 11 then moves the first actuating element 13 away from switch lever 17, whereby operation end switch 15 is actuated and motor 2 stops.
  • the threaded spindle 8 then rotates further, carrying with it the nut 9, so that the second actuating element 14 is also moved away from switch lever 18, and safety end switch 16 is thus actuated.
  • the power supply to motor 2 is hereby interrupted definitively.
  • the invention is not limited to the shown embodiment, but can be varied in many ways.
  • the actuating elements could thus be embodied separately, while they could also be pivotable instead of deformable. Forms of movement other than bending, for instance torsion, could also be envisaged.
  • the scope of the invention is therefore defined solely by the claims.

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  • Transmission Devices (AREA)

Abstract

The invention relates to a device for limiting a movement of a member driven by a motor, comprising at least two switches connected to a circuit of the motor and movable actuating elements driven by the motor and co-acting with the switches, which actuating elements are movable substantially independently of each other. A normal end switch and an emergency end switch can hereby be actuated without the danger of unintentional actuation of the emergency switch. The actuating elements can be movable by a joint drive element connected to the motor and can be resiliently deformable. The actuating elements can form part of a single resiliently deformable actuating member and have a different thickness, and thereby a differing stiffness. The actuating member can herein be a leaf spring, which has an incision from an outer end which mutually separates the actuating elements.

Description

LIMITING DEVICE AND ACTUATING ELEMENT FOR USE THEREIN
The invention relates to a device for limiting a movement of a member driven by a motor, comprising at least two switches connected to a circuit of the motor and movable actuating elements driven by the motor and co-acting with the switches. Such a limiting device is marketed by applicant under the name "end switching system" , and is for instance used in drive systems for ventilating glasshouses.
A precisely controlled climate must be maintained in glasshouses in order to ensure optimal conditions for growth of the products cultivated therein. In addition, the cost of setting and maintaining such a climate must be minimal. The opening and closing of ventilating openings, such as windows, is therefore centrally controlled by a climate computer. This is also the case for the opening and closing of insulating energy screens arranged in the top of the glasshouse.
The climate computer herein actuates a drive system for the ventilation which consists of rack-pinion combinations which are connected to the windows and driven by shafts, which are connected in turn to drive motors, usually via a motor reductor. In addition, the computer actuates a drive system for the energy screens . This drive system is formed by winding shafts, onto which the screens are wound or from which they are unwound, and which are likewise driven by motors, optionally via drive shafts and reductors .
When the windows and/or the energy screens reach an end position, and are therefore fully opened or closed, the drive system has to be switched off. For this purpose the motor reductors are provided with end switches . These switches are connected to an external relay which is arranged in the circuit of the motor. In order to prevent damage to the drive system and/or the windows and/or energy screens driven thereby, the end switches take a dual form. In addition to the operation end switch, which during normal use stops the motor, and thereby also the whole drive, via its external relay, there is also provided a safety end switch which is arranged a small distance from the operation end switch and likewise co-acts with an external relay. This safety relay ensures an interruption of the power supply to the motor, so that the driving will still come to a stop.
The known end switching system of applicant is a rotating end switching system, wherein the end switches are operated by nuts which are arranged on a threaded spindle driven by the motor reductor. Both these nuts, one for each end position, are locked against rotation by means of adjusting screws which are screwed therein and which are placed between two guide members. The nuts will hereby perform a rectilinear movement along the threaded spindle when this spindle is rotated. If however this rectilinear movement is blocked, for instance because the nut comes into contact with a stop, the nut is forced to co-rotate with the threaded spindle. Owing to this rotation the adjusting screws come into engagement with actuating elements, which in turn actuate the end switches .
In the known end switching system the guides are embodied as leaf springs, which are fixed at one end in a housing in which the threaded spindle is mounted. The free outer end of each leaf spring herein takes a bent and stepped form. This stepped outer end defines a first part which co-acts with the operation end switch and a second part which co-acts with the safety end switch. When one of the nuts thus reaches the end of its stroke, and is there rotated, the associated leaf spring is bent aside by the adjusting screw on the nut, whereby the first part of the stepped outer end actuates the operation end switch. The motor is hereby stopped. If, due to a malfunction of this end switch or the thereby actuated external relay, the motor were not to stop, the nut with the adjusting screw thereon is then rotated further and the leaf spring therefore bent further outward. Herein the second part of the stepped outer end will then actuate the safety end switch, whereby the power supply is interrupted. The drive can then only be started by running through a reset procedure .
The known limiting device has the drawback that the distance between the actuating elements formed by the stepped end part of the leaf spring is relatively small. There is hereby the risk of the safety end switch being actuated unintentionally when, as a result of the mass inertia, the different components of the drive system do not come to an immediate stop after the motor reductor has stopped. When this happens, it is first necessary to run through the reset procedure before the drive system can be restarted. This is laborious and time-consuming.
The invention now has for its object to provide a limiting device of the above described type wherein this drawback does not occur. This is achieved in such a limiting device in that according to the invention the actuating elements are movable substantially independently of each other. A greater distance between the actuating elements can hereby be created, so that the safety end switch is not actuated unintentionally, even if the drive system " runs on" after the motor has been stopped.
A structurally simple embodiment of the limiting device is obtained when the actuating elements are movable by a joint drive element connected to the motor.
The movability of the actuating elements can be achieved in simple manner by giving them a resiliently deformable form. In order to create sufficient distance between the moment of actuation of the two end switches, the actuating elements can herein have a differing stiffness . In order to minimize the number of components and still achieve a difference in stiffness, the actuating elements preferably form part of a single resiliently deformable actuating member and have a different thickness. This can be realized in simple manner if the actuating member is a leaf spring, which has an incision from an outer end which mutually separates the actuating elements.
The invention also relates to an actuating element for use in a limiting device as described above.
The invention is now elucidated on the basis of an embodiment wherein reference is made to the annexed drawing, in which:
Figure 1 is a partly cut-away perspective view of a drive system with a limiting device according to the invention,
Figure 2 is a partly cut-away perspective view of the limiting device of figure 1,
Figure 3 shows a cross-section along line III- III in figure 2, and
Figures 4 and 5 show the actuation of respectively the operation end switch and the safety end switch.
A drive system 1 (figure 1) comprises an electric motor 2, a reductor 3 and a limiting device 4 connected thereto.
From reductor 3 the slowed rotational movement of motor 2 is transmitted to a shaft 5 with pinion 6, which is connected in turn to drive shafts, drive rods or drive chains which transmit the movement to rack-pinion combinations for air windows or winding shafts for energy screens .
Limiting device 4 serves to stop motor 2 when the windows and/or screens controlled by drive system 1 have reached one of their end positions. Device 4 comprises a housing 7 arranged on reductor casing 3. A threaded spindle 8 is mounted rotatably in housing 7. This threaded spindle 8 is driven by reductor 3 via a gear transmission (not shown here) .
Arranged on threaded spindle 8 are two nuts 9 which each define an end position of drive system 1. Around each nut 9 is pushed a ring 10 which is fixed to nut 9 by means of adjusting screws 11,12. Adjusting screw 11 herein takes a relatively long form, and can engage with actuating elements 13,14 of limiting device 4 to be discussed below. Limiting device 4 further comprises two sets of end switches 15,16. End switch 15 is connected to an external relay (not shown here) , whereby in normal operation the motor 2 is stopped when an end position is reached. End switch 16 forms an additional safety, and is only actuated if drive system 1 continues to run when this is not intended. This may be the result of a malfunction in end switch 15 or the relay connected thereto, of an incorrect connection or of any other cause. The safety end switch 16 is likewise connected to a relay (not shown) which interrupts the power supply to motor 2.
End switches 15,16 are provided with switch levers 17,18 which are in engagement with the movable actuating elements 13,14. In the shown embodiment these actuating elements 13,14 take a resiliently deformable form, and are clamped between switch levers 17,18 on one side and a protrusion 19 in a wall of housing 7 on the other. Actuating elements 13,14 are herein tensioned around a pin 20 in housing 7. Actuating elements 13,14 are movable substantially independently of each other so as to thus create sufficient space between the moment of actuation of operation end switch 15 on the one hand and safety end switch 16 on the other. Although in the shown embodiment the actuating elements 13,14 are integrated into a single actuating member 21, here a leaf spring, the independent movability is herein ensured in that the actuating elements 13,14 are mutually separated by an incision 22 extending over a part of the length of leaf spring 21.
The independent movability of actuating elements 13,14 is further enhanced in that they here have a differing bending stiffness. Since the actuating elements 13,14 are integrated in the shown embodiment, this difference is created by a difference in the thickness or, rather, width of elements 13,14. This difference is achieved in that the incision 22 is formed from the centre as seen in width direction.
The operation of limiting device 4 according to the invention is now as follows. When the motor 2 is running the threaded spindle 8 is rotated by reductor 3. Nuts 9 herein perform a rectilinear movement because the protruding adjusting screws 11 are guided between the two leaf springs 21. When one of the nuts 9 contacts an end wall 23 of housing 7, it begins to co-rotate with threaded spindle 8. Adjusting screw 11 then moves the first actuating element 13 away from switch lever 17, whereby operation end switch 15 is actuated and motor 2 stops. Should motor 2 fail to stop, the threaded spindle 8 then rotates further, carrying with it the nut 9, so that the second actuating element 14 is also moved away from switch lever 18, and safety end switch 16 is thus actuated. The power supply to motor 2 is hereby interrupted definitively.
A structurally simple, reliable and rapid- action limiting device is thus obtained with the embodiment of actuating elements 13,14 according to the invention.
The invention is not limited to the shown embodiment, but can be varied in many ways. The actuating elements could thus be embodied separately, while they could also be pivotable instead of deformable. Forms of movement other than bending, for instance torsion, could also be envisaged. The scope of the invention is therefore defined solely by the claims.

Claims

Claims
1. Device for limiting a movement of a member driven by a motor, comprising at least two switches connected to a circuit of the motor and movable actuating elements driven by the motor and co-acting with the switches, characterized in that the actuating elements are movable substantially independently of each other.
2. Limiting device as claimed in claim 1, characterized in that the actuating elements are movable by a joint drive element connected to the motor.
3. Limiting device as claimed in claim 1 or 2, characterized in that the actuating elements are resiliently deformable.
4. Limiting device as claimed in any of the foregoing claims, characterized in that the actuating elements have a differing stiffness.
5. Limiting device as claimed in claim 4, characterized in that the actuating elements form part of a single resiliently deformable actuating member and have a different thickness .
6. Limiting device as claimed in claim 5, characterized in that the actuating member is a leaf spring, which has an incision from an outer end which mutually separates the actuating elements.
7. Actuating element evidently intended for use in a limiting device as claimed in any of the foregoing claims .
PCT/NL2001/000485 2000-06-28 2001-06-28 Limiting device and actuating element for use therein WO2002001588A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU69617/01A AU6961701A (en) 2000-06-28 2001-06-28 Limiting device and actuating element for use therein

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1015555 2000-06-28
NL1015555 2000-06-28

Publications (1)

Publication Number Publication Date
WO2002001588A1 true WO2002001588A1 (en) 2002-01-03

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PCT/NL2001/000485 WO2002001588A1 (en) 2000-06-28 2001-06-28 Limiting device and actuating element for use therein

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WO (1) WO2002001588A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2018214B1 (en) * 2017-01-23 2018-01-23 Ridder Beheer B V Device for limiting, and drive system comprising a device for limiting
US20180266529A1 (en) * 2017-03-17 2018-09-20 Aktiebolaget Skf Actuator and method for switching off an actuator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3003636A1 (en) * 1980-02-01 1981-08-06 Emil U. Adolf Becker Gmbh & Co Kg, 6349 Sinn Motor safety switch arrangement - has extra switch shunting each end-position switch and acting as standby position detector
US5299678A (en) * 1991-05-17 1994-04-05 The Chamberlain Group, Inc. Limit switch mechanism for garage door opener

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3003636A1 (en) * 1980-02-01 1981-08-06 Emil U. Adolf Becker Gmbh & Co Kg, 6349 Sinn Motor safety switch arrangement - has extra switch shunting each end-position switch and acting as standby position detector
US5299678A (en) * 1991-05-17 1994-04-05 The Chamberlain Group, Inc. Limit switch mechanism for garage door opener

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2018214B1 (en) * 2017-01-23 2018-01-23 Ridder Beheer B V Device for limiting, and drive system comprising a device for limiting
EP3327740A1 (en) * 2017-01-23 2018-05-30 Ridder Beheer B.V. Device for limiting, and drive system comprising a device for limiting
US20180266529A1 (en) * 2017-03-17 2018-09-20 Aktiebolaget Skf Actuator and method for switching off an actuator
US11204080B2 (en) * 2017-03-17 2021-12-21 Aktiebolaget Skf Actuator and method for switching off an actuator

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