EP0390084A2 - Endschalter - Google Patents

Endschalter Download PDF

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Publication number
EP0390084A2
EP0390084A2 EP90105837A EP90105837A EP0390084A2 EP 0390084 A2 EP0390084 A2 EP 0390084A2 EP 90105837 A EP90105837 A EP 90105837A EP 90105837 A EP90105837 A EP 90105837A EP 0390084 A2 EP0390084 A2 EP 0390084A2
Authority
EP
European Patent Office
Prior art keywords
rotary shaft
head
manipulation
lever
limit switch
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.)
Granted
Application number
EP90105837A
Other languages
English (en)
French (fr)
Other versions
EP0390084A3 (de
EP0390084B1 (de
Inventor
Kunio C/O Omron Corporation Sakamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omron Corp
Original Assignee
Omron Corp
Omron Tateisi Electronics Co
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
Priority claimed from JP3535889U external-priority patent/JPH02126328U/ja
Priority claimed from JP1269478A external-priority patent/JP2824920B2/ja
Application filed by Omron Corp, Omron Tateisi Electronics Co filed Critical Omron Corp
Publication of EP0390084A2 publication Critical patent/EP0390084A2/de
Publication of EP0390084A3 publication Critical patent/EP0390084A3/de
Application granted granted Critical
Publication of EP0390084B1 publication Critical patent/EP0390084B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/22—Operating parts, e.g. handle
    • H01H21/24—Operating parts, e.g. handle biased to return to normal position upon removal of operating force
    • H01H21/28—Operating parts, e.g. handle biased to return to normal position upon removal of operating force 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
    • H01H21/285—Operating parts, e.g. handle biased to return to normal position upon removal of operating force 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 having an operating arm actuated by the movement of the body and mounted on an axis converting its rotating movement into a rectilinear switch activating movement
    • 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
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H01H13/36—Snap-action arrangements depending upon deformation of elastic members using flexing of blade springs
    • H01H13/365—Snap-action arrangements depending upon deformation of elastic members using flexing of blade springs having a symmetrical configuration

Definitions

  • the present invention relates to a limit switch for various kinds of production equipment, industrial robots and so forth, and particularly relates to a limit switch which detects an object by means of a manipulation lever rotatably supported by the head of the switch.
  • Limit switches in general comprise a case housing, a basic switching mechanism having a manipulation rod of the pushed-in type, a head housing a cam for converting a rotating motion into a straight motion, and a manipulation lever pivotally coupled to the head.
  • the cam acts to convert the rotation of a rotary shaft associated with the manipulation lever, into straight motion of a plunger supported by the case or the head, so that the manipulation rod of the basic switching mechanism is pushed in by the plunger. Since the manipulation lever receives the force of the return spring when the lever is rotated back to the free position thereof, the lever is likely to be rotated back beyond the free position.
  • FIGS 1 and 2 shown a limit switch which is relavent to the present invention.
  • the limit switch includes a case 1, a basic switching mechanism 2 housed in the case, and a head 3 secured to the upper end of the case.
  • a rotary shaft 4 is rotatably supported by bearings 5 and 6 is the head 3, and projects out of the cylindrical portion 3a of the head at one end of the shaft.
  • the butt 7a of a manipulation lever 7 for detecting an object is secured to the rotary shaft 4 at the above-mentioned end thereof.
  • a roller 8 is rotatably supported by a shaft 9 at the tip 7b of the manipulation lever 7.
  • the opening of the cylindrical portion 3a of the head 3 is closed with a seal plate 10.
  • An oil seal 11 is interposed between the rotary shaft 4 and the cylindrical portion 3a of the head 3.
  • An annular groove 12 is provided in the outside circumferential surface of the rotary shaft 4.
  • An O-ring 13 is fitted in the annular groove 12.
  • the rotary shaft 4 has a flat portion 14, on the top of which a return plunger 15 shaped as a bottomed cylinder is provided.
  • a return coil spring 16 is engaged between the return plunger 15 and the inside surface of the upper portion of the head 3 so that a returning force is applied to the flat portion 14 of the rotary shaft 4 through the return plunger by the spring.
  • a fixed plate 17 is fitted in the lower portion of the head 3.
  • a lever 21 is supported by a shaft 22 in the case 1 so that the lever is rotatable and the tip of the lever is in contact with the manipulation rod 23 of the basic switching mechanism 2.
  • the central portion of the lever 21 has a projection 21b, which is pushed in by the manipulation plunger 20.
  • An O-ring 24 is provided between the mutually fitted portions of the case 1 and the head 3.
  • a name plate 25 is attached to the outside of the case 1.
  • a terminal box 26 housing terminals 27 is attached to the case 1.
  • a screw 28 for attaching the basic switching mechanism 2 is tightened thereon.
  • An E-­shaped washer 29 for securing the disk cam 19 is provided.
  • the present invention was made in order to solve the above-mentioned problems.
  • a head supporting a rotary shaft is secured to one end of a case housing a switching unit.
  • the butt of the manipulation lever which supports a roller at the tip of the lever so as to detect an object, is secured to the rotary shaft.
  • a return coil spring whose force is applied radially to a flat portion of the rotary shaft by means of a movable plunger is provided in the head.
  • a disk cam by which a manipulation plunger for turning on or off the switching unit is driven in response to the operation of the manipulation lever, is secured to the rotary shaft.
  • the peripheral portion of the disk cam has a projection in a position corresponding to the free position of the manipulation lever, and an elastic stopper means is provided in the head so that when the manipulation lever is rotated back to the free position, the projection comes into contact with the stopper means to brake the lever. Since the manipulation lever is braked by the cooperation between the projection of the peripheral portion of the disk cam and the elastic stopper means when the lever is rotated back to the free position thereof, the lever is prevented from being rotated back beyond the free position. For that reason, the switching unit is prevented from chattering.
  • a rotary shaft is supported by a head secured to one end of a case.
  • the butt of the manipulation lever which supports a roller at the tip of the lever so as to detect an object, is secured to the rotary shaft.
  • a return coil spring whose force is applied to a flat portion of the rotary shaft by means of a return plunger, is provided in the head.
  • a sealed space, switch surrounds a portion of the rotary shaft, is defined in the head and a plurality of movable plates and a plurality of fixed plates are provided in the sealed space and attached to the peripheral surface of the rotary shaft and the inside surface of the head, respectively, in such a manner that the plates are alternately disposed along the axis of the rotary shaft.
  • a viscous fluid is hermetically contained in the sealed space.
  • a rotary shaft is supported by a head secured to one end of a case.
  • the butt of the manipulation lever which supports a roller at the tip of the lever so as to detect an object, is secured to the rotary shaft.
  • a return coil spring whose force is applied to a flat portion of the rotary shaft by means of a return plunger, is provided in the head.
  • the surface of the flat portion of the rotary shaft, with which the return plunger comes into contact, is provided with an elastic plate for absorbing the impact of the plunger on the flat portion when the manipulation lever is rotated back to the free position.
  • the return plunger comes into contact with the elastic plate provided on the flat portion of the rotary shaft so that the inertial force of the lever is absorbed. Therefore, chattering is avoided and the plunger is prevented from colliding against the flat portion of the rotary shaft.
  • the limit switch comprises, a case housing a basic switching mechanism having a manipulation rod of the pushed-in type and a head attached to one end of the case.
  • the manipulation lever is supported by the head so that the lever is rotatable and a cam is provided on a rotary shaft for the manipulation lever so as to convert a rotating motion into a straight motion.
  • the switch also includes a return spring for applying a returning force to the manipulation lever through the cam and the rotary shaft, a plunger provided in the case or the head so as to turn on or off the basic switching mechanism in response to the cam, and a drive lever provided between the cam and the manipulation rod of the basic switching mechanism so that the drive lever counteracts the driving force of the cam to the manipulation rod when the manipulation lever is one the verge of being rotated back beyond the free position.
  • the drive lever provided between the cam and the manipulation rod of the basic switching mechanism counteracts the driving force of the cam to the manipulation rod because of the leverage of the drive lever (which is the ratio of the length from the fulcrum for the drive lever to the point of application of over the length from the fulcrum to the point of action of the lever) so that the manipulation rod is prevented from being pushed in. For that reason, the inversion signal is prevented from being generated.
  • Embodiments of the present invention to be described hereinbelow provides advantages over the foregoing structure.
  • FIG. 3 is a cutaway front view of a limit switch which is one of the embodiments.
  • FIG. 4 is a cutaway side view of the limit switch.
  • FIG. 5 is an exploded view of a major part of the limit switch.
  • the portions of the limit switch, which correspond to those of the limit switch provided in accordance with the related art, are denoted by the same reference symbols and are not described in detail hereinafter.
  • the elastic stopper means 31 of the limit switch is provided in the head 3 thereof, and includes a guide cylinder 32 extending down from the inside surface of the head, a compressed spring 33 fitted in the guide cylinder, and a steel ball 34 interposed between the spring and the peripheral surface of the disk cam 19.
  • the projection 30 comes into contact with the elastic stopper means 31 so that the lever is braked.
  • the operation of the limit switch is described in detail from now on.
  • the basic operation of the limit switch is the same as that of the operation of the limit switch provided in accordance with the related art, and is thereof not described in detail hereinafter.
  • FIGS. 6, 7 and 8 show a limit switch which is another embodiment.
  • the disk cam 19 of the limit switch has a plateau-like projection 40.
  • the switch includes an elastic stopper means 41 made of a nearly U-shaped plate spring 44 secured to the inside surface of the head 3 of the switch with screws 42 and washers 43 or the like.
  • FIG. 9 shows a limit switch which is yet another embodiment.
  • the disk cam 19 of the limit switch has two projections 70A and 70B.
  • the switch includes an elastic stopper means 72 made of a curved plate spring 71.
  • the disk cam 19 is pushed between the projections 71A and 70B thereof by the central portion 71a of the plate spring 71.
  • the projections 70A and 70B can be formed by joining two cam disks 19A and 19B to each other with a positional difference between them in the circumferential direction thereof, for example.
  • the manipulation lever 7 of the limit switch is rotated back to the free position thereof, the projections 70A and 70B come into contact with the central portion 71A of the plate spring 71 so that the lever is braked.
  • the inertial force of the lever 7 is thus absorbed so that the lever is prevented from being rotated back beyond the free position thereof. For that reason, the basic switching mechanism of the limit switch is prevented from chattering and the like.
  • the disk cam 19 is formed with the peripheral projection 30 or the like in each of the embodiments described above, the present invention can be embodied so that the peripheral portion of the rotary shaft 4 is formed with a notch 80 and projections 81A and 81B, which come into contact with the steel ball 34 or the like, a shown in FIG. 10.
  • FIG. 11 shows a limit switch switch is yet another embodiment.
  • a cutaway front view of the limit switch of this embodiment is similar to that shown in FIG. 1.
  • the portions of the limit switch which correspond to those of the limit switch provided in accordance with the related art are denoted by the same reference symbols and thus are not described in detail hereinafter.
  • a sealed space 130 is defined by the inside surface of the cylindrical portion 3a of the head 3 of the limit switch and the oil seal 11 and O-ring 13 thereof.
  • a viscous fluid 131 such as oil is hermetically contained in the sealed space 130.
  • a plurality of movable plates 132 and a plurality of fixed plates 133 are alternately provided in the sealed space 130 in such a manner that the movable plates are secured to the outside circumferential surface of the rotary shaft 4 of the switch and the fixed plates are secured to the inside surface of the head 3.
  • FIGS. 13 and 14 show a limit switch which is yet another embodiment.
  • the portions of the limit switch which correspond to those of the limit switch provided in accordance with the related art are denoted by the same reference symbols and thus are not described in detail hereinafter.
  • the top of the flat portion 14 of the rotary shaft 4 of the limit switch shown in FIGS. 13 and 14 has a recess 230 as shown in FIG. 15
  • a return plunger 15 provided over the top of the flat portion 14 of the rotary shaft 4.
  • An elastic plate 231 such as a rubber plate is fixed in the recess 230 by sticking or the like so that the elastic plate absorbs impact of the return plunger 15 on the flat portion 14 of the rotary shaft 4 when the manipulation lever 7 of the limit switch is rotated back to the free position thereof.
  • FIG. 17 shows a limit switch which is yet another embodiment.
  • the limit switch includes a case 301 housing a basic switching mechanism 302, a head 303 secured to the upper end of the case, and a rotary shaft 304 supported by bearings 305 and 306 in the head.
  • the butt 307a of the manipulation lever 307 of the limit switch is secured to the rotary shaft 304 at the outer end 304a thereof.
  • the outside circumferential surface of the rotary shaft 304 has an annular groove 308.
  • a roller 309, with which a detected object such as a workpiece comes into contact, is rotatably supported with a shaft 310 at the tip 307b of the manipulation lever 307.
  • An O-ring 311 is fitted in the annular groove 308.
  • An oil seal 312 is provided between the head 303 and the rotary shaft 304.
  • a first cam 313A and a second cam 313B are secured side by side to the rotary shaft 304.
  • the surface 313a of the first cam 313A is set for clockwise rotation shown by arrows a in FIGS. 18 and 20.
  • the surface 313b of the second cam 313B is set for counterclockwise rotation shown by arrows b in FIGS. 18 and 20.
  • the surface 313b of the second cam 313B is set for counterclockwise rotation shown by arrows b in FIGS 18 and 20.
  • a spring 314 is engaged around the first and the second cams 313A and 313B so as to apply a returning force to the manipulation lever 307 through the cams. As shown in FIG.
  • a first plunger 316A and a second plunger 316B which correspond to the first and the second cams 313A and 313B, are movably supported in the axial directions of the plungers by a plunger holder 315 provided at the bottom of the head 303.
  • a first lever 317A and a second lever 317B are supported with shafts 318A and 318B by the holder 315.
  • the first plunger 316A is driven by the first lever 317A and the first cam 313A.
  • the second plunger 316B is driven by the second lever 317B and the second cam 313B.
  • a first drive lever 320A and a second drive lever 320B are supported by a shaft 319 in the case 301 between the basic switching mechanism 302 and the first and the second plungers 316A and 316B.
  • the leverages of the drive levers 320A and 320B are set so that the basic switching mechanism 302 is turned on or off through the motions of the plungers 316A and 316B in the axial directions thereof.
  • the drive levers counteract the driving actions of the plungers when the manipulation lever 307 is on the verge of being rotated back beyond the free position thereof, which is shown by a reference symbol FP in FIG. 20.
  • FIG. 19 shows the basic switching mechanism 302 of the limit switch shown in FIG. 17.
  • the mechanism 302 includes an upper switching unit SW1 and a lower switching unit SW2 provided in the casing 331 of the mechanism, and a first manipulation rod 332A and a second manipulation rod 332B supported concentrically to each other with return springs 333A and 333B in the casing so that the rods are movable up an down.
  • the manipulation lever 307 is rotated clockwise with regard to FIG. 30, the first manipulation rod 332A is pushed in by the first drive lever 320A.
  • the manipulation lever 307 is rotated counterclockwise with regard to FIG. 20, the first manipulation rod 332A is pushed in by the first drive lever 320A.
  • a First movable spring 334A and a second movable spring 334B are engaged with the first and the second manipulation rods 332 A and 332B, respectively.
  • a first movable member 335A and a second movable member 335B are driven by the first and the second manipulation rods 332A and 332B through the actions of both the ends of the first and the second movable springs 334A and 334B, respectively.
  • Movable contacts 336A and 337A are secured to the first movable member 335A at both the ends thereof.
  • Movable contacts 336B and 337B are secured to the second movable member 335B at both the ends thereof.
  • a part of fixed terminals 338A and 339A and another pair of fixed terminals 340A and 341A are secured to the upper portion of the casing 331.
  • Normally-open fixed contacts 342A and 343A are secured to the fixed terminals 338A and 339A and face the movable contacts 336A and 337A, respectively.
  • Normally-closed fixed contacts 344A and 345A are secured to the other fixed terminals 340A and 341A and face the movable contacts 336A and 337A, respectively.
  • a pair of fixed terminals 338B and 339B and another pair of fixed terminals 340B and 341B are secured to the lower portion of the casing 331.
  • Normally-open fixed contacts 342B and 343B are secured to the fixed terminals 338B and 339B and face the movable contacts 336B and 337B, respectively.
  • Normally-closed fixed contacts 344B and 345B are secured to the other fixed terminals 340B and 341B and face the movable contacts 336B and 337B, respectively.
  • the first lever 317A is rotated by the surface 313a of the first cam 313A so that the first plunger 316A is moved down in the axial direction thereof. Because of the downward movement of the plunger 316A, the first manipulation rod 332A of the basic switching mechanism 2 is pushed in through the action of the drive lever 320A.
  • the manipulation lever 307 is rotated further clockwise to an operative position OP1 shown in FIG.. 20, the first movable spring 334A is inverted due to the displacement of the first manipulation rod 332A so that the first movable member 335A is moved up.
  • the movable contacts 336A and 337A come into contact with the normally-open fixed contacts 342A and 343A, respectively, as shown in FIG. 21b.
  • the manipulation lever 307 is rotated back to the neutral free position FP by the force of the return spring 314.
  • the first manipulation rod 332A of the basic switching mechanism 302 is returned to the original position thereof by the force of the return spring 333A, the movable member 335A is moved back to the original position thereof through the action of the movable spring 334A, and the movable contacts 336A and 337A come into contact with the normally-closed fixed contacts 344A and 345A, respectively.
  • the movable contacts 336B and 337B come into contact with the normally-open fixed contacts 342B and 343B, respectively, as shown in FIG. 21c.
  • the manipulation lever 307 is rotated back to the neutral free position FP.
  • the second manipulation rod 332B is returned to the original position thereof by the force of the return spring 333B, the movable member 335B is moved back to the original position thereof through the action of the movable spring 334B, and the movable contacts 336B and 337B come into contact with the normally-closed fixed contacts 344B and 345B, respectively.
  • the leverage of the first drive lever 320A which is the ratio of the length from shaft 319 to the point of application of force (where the first plunger 316A comes into contact with the first drive lever) over the length from shaft 319 to the point of action (where the tip of the first drive lever comes into contact with the first manipulation rod 332A) is selectively preset so that the first drive lever counteracts the driving force of the first cam 313A when the manipulation lever 307 is on the verge of being rotated back beyond the neutral free position FP thereof. For that reason, the manipulation lever 307 is prevented from being rotated back beyond the neutral free position FP thereof.
  • the first manipulation rod 332A is thus prevented from being pushed in to unnecessarily turn on the first switching unit SW1 of the basic switching mechanism 302.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Control Of Eletrric Generators (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP90105837A 1989-03-28 1990-03-27 Endschalter Expired - Lifetime EP0390084B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP35358/89U 1989-03-28
JP3535889U JPH02126328U (de) 1989-03-28 1989-03-28
JP1269478A JP2824920B2 (ja) 1989-10-17 1989-10-17 リミツトスイッチ
JP269478/89 1989-10-17

Publications (3)

Publication Number Publication Date
EP0390084A2 true EP0390084A2 (de) 1990-10-03
EP0390084A3 EP0390084A3 (de) 1992-03-04
EP0390084B1 EP0390084B1 (de) 1996-07-10

Family

ID=26374336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90105837A Expired - Lifetime EP0390084B1 (de) 1989-03-28 1990-03-27 Endschalter

Country Status (3)

Country Link
EP (1) EP0390084B1 (de)
AT (1) ATE140338T1 (de)
DE (1) DE69027696T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5430264A (en) * 1991-09-14 1995-07-04 Omron Corporation Limit switch
CN103197726A (zh) * 2012-01-06 2013-07-10 沈阳新松机器人自动化股份有限公司 基于微动开关的行程限位机构
CN103192382A (zh) * 2012-01-06 2013-07-10 沈阳新松机器人自动化股份有限公司 基于磁力的行程限位机构
CN111033667A (zh) * 2018-03-14 2020-04-17 欧姆龙株式会社 限位开关

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020104577B3 (de) * 2020-02-21 2021-01-21 Alpha Deuren International Bv Elektrisches Schaltelement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749860A (en) * 1971-12-30 1973-07-31 Allen Bradley Co Sealed limit switch
US3829637A (en) * 1973-01-02 1974-08-13 Gen Electric Limit switch having mechanism to eliminate unwanted reactivation thereof
US3959614A (en) * 1974-10-07 1976-05-25 Allen-Bradley Company Limit switch rotary return mechanism
JPS57162219A (en) * 1981-03-30 1982-10-06 Omron Tateisi Electronics Co Holding type sealed switch

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5430264A (en) * 1991-09-14 1995-07-04 Omron Corporation Limit switch
CN103197726A (zh) * 2012-01-06 2013-07-10 沈阳新松机器人自动化股份有限公司 基于微动开关的行程限位机构
CN103192382A (zh) * 2012-01-06 2013-07-10 沈阳新松机器人自动化股份有限公司 基于磁力的行程限位机构
CN103192382B (zh) * 2012-01-06 2015-06-03 沈阳新松机器人自动化股份有限公司 基于磁力的行程限位机构
CN111033667A (zh) * 2018-03-14 2020-04-17 欧姆龙株式会社 限位开关
CN111033667B (zh) * 2018-03-14 2021-10-08 欧姆龙株式会社 限位开关

Also Published As

Publication number Publication date
EP0390084A3 (de) 1992-03-04
ATE140338T1 (de) 1996-07-15
DE69027696T2 (de) 1997-03-06
EP0390084B1 (de) 1996-07-10
DE69027696D1 (de) 1996-08-14

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