US3814216A - Elevator speed sensor - Google Patents
Elevator speed sensor Download PDFInfo
- Publication number
- US3814216A US3814216A US00356268A US35626873A US3814216A US 3814216 A US3814216 A US 3814216A US 00356268 A US00356268 A US 00356268A US 35626873 A US35626873 A US 35626873A US 3814216 A US3814216 A US 3814216A
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- United States
- Prior art keywords
- cam
- speed
- predetermined
- shaft member
- car
- 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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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
- B66B5/06—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed electrical
Definitions
- Attorne Agent or Firm-D. R. Lackey Inventor: Albert J. Pisatowski, Wa ne, NJ. Assignee: Westinghouse Electric Corporation,
- ABSTRACT An elevator system including an elevator car mounted Pittsburgh, Pa.
- Cit d st acting car speed sensor insures that the speed in- UNITED STATES PATENTS dication used by the supervisory control is correct and timely at each car position check point, within a predetermined small tolerance.
- the new and improved speed sensor should eliminate as much mass as possible from the operating mechanism to improve its torque to inertia ratio and provide a substantially linear response to elevator speed with minimum delay between the arrival of the elevator car at a predetermined speed and theactuation of a switchwhich is intended to operate at this speed.
- a switch intended it would be desirable to operate a switch intended, to operate at a predetermined car speed within 50 milliseconds of the time at which the car reaches this speed, either when the car is accelerating or decelerating.
- a switch which is to be operated at a predetermined speed of the elevator car by the speed sensor should close-in and dropout within a predetermined small deviation from the specified speed value, such as within i 5% or less.
- a speed sensor with: (a) good linearity at the speeds to be monitored for terminal slowdown, (b) a very small amount of hysteresis on close-in and drop-out, and (c) a fast operating response once the car speed is at the specified operating speed of the switch, would permit an eddy current coupling speed sensor to accurately monitor normal terminal slowdown at predetermined positions of the car with the respect to a terminal, as well as to monitor car speed for the purpose of initiating emergency terminal slowdown procedures.
- the switch of the hereinbefore mentioned patent was not intended to perform such exacting functions, and its torqueinertia ratio, due in part to the'weight bias used, is such Copending application Ser. No.
- This sensor automatically decouples the magnetic field producing element from the electroconductive disc of the eddy current coupling once the elevator car speed increases beyond the range in which the speed sensor is used, i.e., to initiate pre-opening of the car and hatch doors at a predetermined speed as the elevator car approaches a landing or floor to stop, and to take corrective action should the car doors be open, or opening, when the car speed exceeds a predetermined magnitude.
- the present invention is a new and improved elevator system which utilizes a new and improved speed sensor having an eddy current coupling, with the speed sensor meeting the exacting requirements necessary to monitor the speed of an elevator car at a plurality of positions as it approaches the upper and lower terminals, for both normal terminal slowdown monitoring and emergency terminal slowdown monitoring.
- the new and improved speed sensor is particularly useful in an elevator system which utilizes solid state control, such as the elevator system described in copending application Ser. No. 254,007, filed May 17, 1972, which now US. Patent 3,750,850, is assigned to the same assignee as 'the present application, but it is to be understood that the speed sensor. may be utilized with elevator systems, having the conventional electromechanical type floor selector and control.
- the new and improved speed sensor eliminates the need for bias in the form of an auxiliary weight, and p qvi. sub ant l y @balaneesi.fastastit ssy tet with very little inertia by utilizing a shaft member mounted for rotation upon which the magnetic field producing element of the eddy current coupling is mounted, as well as the cam members for operating switches at predetermined car speeds.
- the magnetic field producing element, or magnet, and the cam members are mounted on a common shaft member in at least partial counterbalancing relation, i.e., extending outwardly from the shaft in opposite directions.
- First and second extension spring members are used to reduce hysteresis in the speed sensor, preventing an overshoot on acceleration, and a lag on deceleration, providing a speed sensor in which a switch will close-in and drop-out with very little deviation from a specified car speed, and which will operate within 50 milliseconds of the time the car reaches its specified speed while either accelerating or decelerating.
- FIG. 3 is an end elevational view, partially in section, of the speed sensor shown in FIG. 2.
- Elevator system 10 includes an elevator car 12 and counterweight 14, both constrained for movement in the hoistway 16 of a building 18 having a plurality of landings or floors 20, only one of which is illustrated, to be served by the elevator car 12.
- the car 12 and counterweight 14 are interconnected via hoist roping 22 which is 'reeved over a traction sheave 24 driven by an elevator drive motor 26.
- Drive motor 26 may be mounted inthe penthouse of the building 18, shown generally byline 28.
- Y Elevator system' 10 includes a speed sensor 30 which actuates switches between predetermined first and second positions in response to the speed of the elevator car, which switches are connected to supervisory electrical controls, shown generally at 32.
- the drive machine 26 is responsive to the supervisory control 32, as indicated generally by line 33.
- the speed sensor 30 may be made responsive to the speed of the elevator car in any suitable manner.
- the speed sensor 30 may be coupled to a governer 34 disposed in the penthouse 28, and which is responsive to the speed of the car 12 via a governor rope 36.
- the governor rope 36 extends from the car 12,
- a wheel 42 disposed to be driven with wheel 40 in response to movement of the elevator car is coupled with a wheel 44 of the speed sensor 30 via coupling means 46.
- Wheels 42 and 44 are preferably gears and coupling means 46 is preferably a timing belt having teeth thereon for cooperating with the gears to provide a driving arrangement having very little backlash or slippage.
- a slack belt lever 48 is biased against the coupling means 46 to detect breakage thereof.
- FIGS. 2 and 3 are side and end elevational views thereof, respectively,
- speed sensor 30 includes a supporting structure 50 having a base member 52 and spaced support members 54 and 56 rising perpendicularly from the base member 52.
- the wheel 44 and slack belt lever 48 are rotatably fixed to an external surface of support member 56.
- the slack belt lever 48 is disposed to actuate a switch 58, through a sleeve member 60.
- Switch 58 may be a mercury switch connected to initiate some control action, such as stopping the car 12 should the belt 46 break.
- Speed sensor 30 includes first and second shaft members 62 and 64, respectively, mounted for rotation.
- the shaft members 62 and 64 are spaced with their axes parallel with one another and aligned in the same plane, which plane is perferably vertical, as best illustrated in FIG. 3.
- Shaft member 62 is journaled in bearings 66 and 68 mounted in support members 54 and 56, respectively, with one end of shaft member 62 extending through support member 56 and having drive wheel 44 fixed thereto. Therefore, when the elevator car 12 moves and rotates wheel 44, shaft 62 rotates with a speed directly responsive to the speed of the elevator car.
- shaft 64 is journaled in bearings 70 and 72, which are mounted in the support members 54 and 56, respectively.
- the first and second shaft members 62 and 64 are coupled via an eddy current coupling 73, which includes a driving element 74 fixed to shaft 62, and a driven element 76 fixed to shaft 64.
- the driving element 74 includes an electroconductive armature in the form of a circular metallic disc member 78.
- the flat plane of the disc member 78 is disposed such that it is perpendicular to the axis of shaft 62, with the disc being mounted within an enclosure formed by the upstanding support members 54 and 56, and a pair of cooperative side members 80 and 82.
- Disc 78 is constructed of anelectroconductive material, such as aluminum or copper. The disc 78 is accurately held by a heavier but smaller diameter member 84, which member also functions as a heat sink.
- the driven element 76 includes means 86 for producing a magnetic field in which a portion of the disc 78 rotates, such as a C-shaped permanent magnet having a high coercive force.
- the disc 78 has a peripheral portion located between the pole pieces of magnet 86 when the shaft 64 and the driven element 76 are in a predetermined angular location, such as with the vertical center line of the magnet 86, as illustrated in the elevational view of FIG. 3, being located on an imaginary line 88 drawn between and perpendicular to the axes of shafts 62 and 64.
- Magnet 86 is disposed on one side of shaft member 64, extending outwardly therefrom on a support member 90.
- Support member 90 may be fixed to shaft member 64 by any suitable means, such as by screws 92.
- Shaft member 64 may have a square or rectangular cross-sectional configuration, starting a predetermined dimension from each end, to facilitate connecting member 90 thereto.
- Shaft member 64 carries a plurality of cam members for actuating a plurality of switches.
- the number of cam members carried by shaft 64 depends upon the number of speed check points required. In general, the higher the car speed the more speed check points and thus the more cam members required. For example, an
- elevator car which has a normal maximum operating speed of 1,400 feet per minute may require speed switches which operate at 350, 640, 910, 1,100 and 1,260 feet per minute, with these speed switches being checked, for example, when the elevator car is 3, 10, 20, 30 and 40 feet, respectively, from the upper and lower terminals.
- the switches for monitoring normal terminal slowdown may be separate from the switch which monitors emergency terminal slowdown; or, one of the switches for monitoring normal terminal slowdown may be used for monitoring emergency terminal slowdown by checking the condition of the switch when the car is at a closer point to the terminal than where this same switch is checked during normal terminal slowdown monitoring.
- cam members 100, 102, 104, 106 and 108 depend from shaft members 64 via support members 110, 112, 114, 116 and 118, respectively.
- Each of the support members, such as support member 110 is secured to shaft 64 in any suitable manner, such as by screws 120.
- Support members 110, 112, 114, 116 and 118 extend outwardly from shaft member 64 in an opposite or counterbalancing direction compared with the direction of support 90 for the magnet 86.
- the cam support members may be secured to the surface of shaft member 64 which is opposite to or parallel with the surface to which the magnet support 90 is secured.
- a line drawn through a predetermined one of the mounting screws 120 which is perpendicular to the longitudinal center line of shaft member 64 will bisect the cam surface of its associated cam member. This facilitates locating the tapped mounting holes in shaft member 64 for mounting the cam support members as the locations of the cam members and their associated switches will be fixed. It will also be noted from FIG.
- each of the cam members are associated with first and second switches, and each cam member has first and second similarly shaped cam surfaces for actuating the first and second switches, respectively.
- cam members 100, 102, 104, 106 and 108 are associated with first switches 122, 124, 126, 128 and 130, respectively, which switches are actuated when the elevator car is traveling in a first direction, and a like numbered plurality of second switches, such as switch 132 for cam 100, as illustrated in FIG. 3, which switches are actuated when the elevator car is traveling opposite to the first direction.
- first switches 122, 124, 126, 128 and 130 respectively, which switches are actuated when the elevator car is traveling in a first direction
- second switches such as switch 132 for cam 100, as illustrated in FIG. 3
- the construction of the speed sensor shown in FIGS. 2 and 3 enables the cam member for a predetermined speed to be an integral structure, embodying the cam surfaces in a single member for two switches, one for the up travel direction and one for the down travel direction.
- Each of the switches such as switch 122, may be a microswitch with normally open contacts, or normally closed contacts, when in its unactuated condition, depending upon the specific control arrangement they are to be used in. For purposes of example, it will be assumed that the contacts of the switches are normally open, switching to their closed positions when actuated by their associated cam member. Since each of the switches, and their mounting arrangements are similar, only switch 122 and its mounting arrangement will be described in detail.
- Switch 122 includes an actuating arm 134, and a roller 136 journaled in a bearing assembly carriedby the outwardly extending end of the actuating arm.
- Switch 122 is mounted on a support member 138, and the support member 138 is adjustably mounted on a bracket member 140.
- a base member 142 is fixed to the inside surface of the bottom member 52, such as by screws 1, with the base member having slots 146 formed therein for adjustably mounting bracket member 140.
- the slots 146 provide an X-axis adjustment for switch 122, as viewed in FIG. 3, enabling the bracket 140 to be moved in a direction perpendicular to the side members and 82.
- screws'148 disposed through openings in a lower flange on bracket 140, and through slots 146, may be tightened. Loosening the screws 148 permits the bracket 140 to be moved to a new position between the side members 80 and 82, if required.
- a Y-axis adjustment of switch 122 is provided by screw 150 which is held captive by an upper flange portion '152 on bracket 140, and which extends into a threaded opening in support member 138.
- Switch 122 is fixed to support member 138 via screws 152 and 154 which extend completely through both the switch 122 and the support 138, and through spaced parallel verti cal slots 156 and 158, respectively, formed in the upstanding portion of bracket 140.
- a cooperative back support member 160 may be disposed on the side of bracket 140 which is opposite to the side on which support 138 is disposed, for threadably receiving the ends of screws 152 and 154.
- first and second extension spring members 180 and 182 which provide a retarding force on increasing car speed, and a restoring or aiding force on decreasing carspeed, to provide close-in and dropout of a switch within 5 percent of the nominal car speed at which the switch is'intended to close-in and drop-out.
- retarding force means a force which opposes the movement of the magnet 86, away from its at rest angular position
- restoring force means a force which aids the return of the magnet to its at rest position.
- the spring members 180 are applied to the magnetcam rotatable assembly 76 on the cam side of the longitudinal center line of shaft member 64, with spring 180 being effective when the'magnet-cam assembly 76 rotates counterclockwise and spring 182 being effective when the magnet-cam assembly 76 rotates clockwise,
- Thesupport member 90 upon which magnet 86 is mounted maybe constructed to extend past shaft member 64 by a predetermined dimension toward the cam members, with this downwardly extending end carrying a small shaft member 184 which extends through and. is securedin an opening near the end of support member 90, with opposite ends of the shaft member 184 having openings 186 and 188 therein for receiving the ends of springs 180 and 182, respectively.
- the other ends of the springs 180 and 182 are attached to support members 190 and 192, respectively, which members extend between the upright support members, 54 and 56, such that the longitudinal axes of members 190 and 192 are parallel with the axes of shaft members 62 and 64.
- the extension springs 180 and 182 may be secured to their associated support members 190 and 192 in a manner similar to the support arrangement used for their other ends, utilizing small shaft members 196 and 198 which extend-through and are fixed in openings disposed in support members 190 and 192. Openings near the ends of shaft members 196 and 198 which face the rotatable driven assembly 76 of the eddy current coupling receive the ends of the springs.
- the support members 190 and 192 are located between the base 52 oand top portion 200 of the speed sensor such that the longitudinal center lines of the extension springs 180 and 182 are substantially horizontal. As best illustrated in FIG.
- the spring support members 190 and 192 may have portions or legs which extend horizontally along the inner surfaces of support members 54 and 56, such as portions or legs 197 and 199, with these legs having a plurality of spaced openings therein.
- the initial lengths of springs and 182 may be adjusted by placing mounting screws 201 and 203 through openings in support 56 and through selected openings in legs 197 and 199 of these spring support brackets, and similar screws through similar openings in support 54 and like positioned openings in leg portions of members and 192.
- the electrical contacts of the various switches are connected in control circuitry, the wires of which enter the speed sensor via a connector assembly 202, through an opening in one of the support members, such as through support member 54.
- the control circuitry checks each switch of a group of switches, with the group checked depending upon the travel direction of the elevator car, as the elevator approaches a terminal. For example, if the contacts of these switches are normally open, an exemplary control arrangement would connect the contacts of each switch in series with the contacts of a switch responsive to car position. These pairs of serially connected contacts would then be connected in parallel with the other pairs, and the parallel arrangement would be connected in series with a control relay.
- a car position switch would close and if the car speed is above the intended speed at this location, the speed switch contacts would be closed and the control relay would be energized.
- the specific action initiated'by the picking up of the control relay depends upon whether normal or emergency terminal slowdown is being monitored at this instance. If the car speed is below the speed of the switch being monitored, the contacts of the switchwill be open when they are checked, and the control relay will not be energized.
- the rotational speed of disc 78 at rated car speed may be selected to be relatively low, such as 1,000 R.P.M., to prevent themagnet from being driven partially off the disc 78 and retain a linear movement of the magnet 86 with car speed.
- An R.P.M. of about 1,000 will also eliminate problems due to over-heating of the disc 78.
- Extension spring members provide retarding and restoring forces during acceleration and deceleration, respec- 9 tively, of the elevator car, to providethe very low hystersis essential for a speed'sensor which is to monitor normal and emergency terminal slowdown.
- An elevator system comprising: an elevator car, means for moving said elevator car in a predetermined path, speed sensor means including an eddy current coupling having rotatable driving and driven elements,
- said driven element including a shaft member mounted for rotation, a magnetic field producing element, and cam means,
- said magnetic field producing element and said cam means being mounted on said shaft member to provide at least a partial counterbalancin g relationship therebetween,
- switch means disposed to be operated from a first condition to a second condition by said cam means at a first predetermined speed of the elevator car when theelevator car is accelerating, and back to its first predetermined condition at a second predetermined speed when the elevator car is deceleratmg,
- control means responsive to the condition of said switch means
- said means for moving said elevator car in a predetermined path being responsive to said control means
- the switch means includes first and second switches and the cam means includes a single member having first and second cam surfaces disposed to operate the first and second switches, respectively, when the elevator car is moving in first and second directions, respectively.
- the spring means includes first and second extension spring members connected to the driven element of the eddy current coupling such that the first extension spring member is effective when the driven element rotates in a first circumferential direction, and the second exten- 10 1 sion springmember is effective when the driven element rotates in a direction opposite to the first circumferential direction.
- the switch means includes a predetermined plurality of pairs of switches
- the cam means includes a like plurality of cam members, each of said cam members being associated with a different pair of switches, with each cam member defining first and second cam surfaces for op erating a predetermined switch of the pair with one cam surface when the car is moving in one direction, and for operating the remaining switch of the pair with the other cam surface when the car is moving in the opposite direction.
- a speed sensor comprising:
- said driving and driven elements being mounted for rotation on said supporting structure on first and second spaced, parallel shaft members, respectively, with the spacingbeing selected such that the driven element establishes a magnetic field which links said driving element,
- cam means mounted on the second shaft member to provide at least a partial counterbalancing relationship with the magnetic field producing driven element
- switch means carried by said support structure and disposed to be operated by said cam means from a first to a second condition at a first predetermined rotational speed of the driving element, as the speed of the driving element is increasing, and back to its first condition at a second predetermined rotational speed of the driving element when the speed of the driving element is decreasing,
- any unbalance between the cam means and the magnetic field producing driven element about the second shaft member favors the cam means to direct the field producing driven element to a predetermined angular location about the second shaft member when the driving element is at rest.
- the switch means inciudes first and second swab E556
- the cam means includes a single member having first and second cam surfaces disposed to operate the first and second switches, respectively, when the elevator car is moving in first and second directions, respectively.
- the speed sensor of claim 7 wherein the magnetic bers connected to the driven element such that the first extension spring member is effective when the driven element rotates in a first cicumferential direction, and the second extension spring member is effective when the driven element rotates in a direction opposite the first circumferential direction.
- the switch means includes a predetermined plurality of pairs of switches
- the cam means includes a like plurality of cam members, each of said cam members being associated with a different pair of switches, with each cam member defining first and second cam surfaces for operating a predetermined switch of the pair with one cam surface when the driving element is rotating in one circumferential direction, and for operating the remaining switch of the pair with the other cam surface when the driving element is rotating in the opposite circumferential direction.
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- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Elevator Control (AREA)
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00356268A US3814216A (en) | 1973-05-01 | 1973-05-01 | Elevator speed sensor |
CA197,472A CA998195A (en) | 1973-05-01 | 1974-04-11 | Elevator speed sensor |
NL7405309A NL7405309A (xx) | 1973-05-01 | 1974-04-19 | |
IT41580/74A IT1010804B (it) | 1973-05-01 | 1974-04-26 | Impianto di ascensori e sensore di velocita per detto impianto |
BE1005915A BE814307A (fr) | 1973-05-01 | 1974-04-29 | Systeme d'ascenseur |
BR3520/74A BR7403520D0 (pt) | 1973-05-01 | 1974-04-30 | Sistema de elevador |
DE2420998A DE2420998A1 (de) | 1973-05-01 | 1974-04-30 | Geschwindigkeitswaechter fuer einen aufzug |
LU69962A LU69962A1 (xx) | 1973-05-01 | 1974-04-30 | |
ES425801A ES425801A1 (es) | 1973-05-01 | 1974-04-30 | Perfeccionamientos introducidos en un sistema de ascensor. |
GB1908774A GB1468037A (en) | 1973-05-01 | 1974-05-01 | Elevator system |
JP49048355A JPS5014052A (xx) | 1973-05-01 | 1974-05-01 | |
FR7415293A FR2228022B1 (xx) | 1973-05-01 | 1974-05-02 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00356268A US3814216A (en) | 1973-05-01 | 1973-05-01 | Elevator speed sensor |
Publications (1)
Publication Number | Publication Date |
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US3814216A true US3814216A (en) | 1974-06-04 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00356268A Expired - Lifetime US3814216A (en) | 1973-05-01 | 1973-05-01 | Elevator speed sensor |
Country Status (12)
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---|---|
US (1) | US3814216A (xx) |
JP (1) | JPS5014052A (xx) |
BE (1) | BE814307A (xx) |
BR (1) | BR7403520D0 (xx) |
CA (1) | CA998195A (xx) |
DE (1) | DE2420998A1 (xx) |
ES (1) | ES425801A1 (xx) |
FR (1) | FR2228022B1 (xx) |
GB (1) | GB1468037A (xx) |
IT (1) | IT1010804B (xx) |
LU (1) | LU69962A1 (xx) |
NL (1) | NL7405309A (xx) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4128141A (en) * | 1977-07-07 | 1978-12-05 | Westinghouse Electric Corp. | Elevator system |
US4356896A (en) * | 1979-11-28 | 1982-11-02 | Mitsubishi Denki Kabushiki Kaisha | Elevator terminal deceleration system |
US4503939A (en) * | 1983-08-19 | 1985-03-12 | Westinghouse Electric Corp. | Elevator system |
US4971178A (en) * | 1989-02-02 | 1990-11-20 | Inventio Ag | Elevator system with independent limiting of a speed pattern in terminal zones |
WO2007007028A1 (en) * | 2005-07-09 | 2007-01-18 | Anthony Cuthbert | Traction arrangements |
US20070227826A1 (en) * | 2004-09-09 | 2007-10-04 | Mitsubishi Electric Corporation | Elevator Apparatus |
WO2008006396A1 (de) * | 2006-07-14 | 2008-01-17 | Wittur Ag | Mehrfunktionale elektronische notbremsfangeinrichtung typ,,isg“ |
US20080262647A1 (en) * | 2004-12-06 | 2008-10-23 | Gerhard Gloss | Speed Monitoring Method In An Automation System For A Conveyor Installation |
CN101287670B (zh) * | 2006-07-14 | 2011-03-30 | 维托公开股份有限公司 | 具有电子紧急安全钳的电梯 |
EP2112116A4 (en) * | 2007-02-15 | 2012-03-28 | Mitsubishi Electric Corp | LIFT SECURITY DEVICE |
US9033111B2 (en) | 2009-07-20 | 2015-05-19 | Otis Elevator Company | Elevator governor system |
US20160008939A1 (en) * | 2014-07-11 | 2016-01-14 | Fanuc Corporation | Machine tool with rotary table |
US11261055B2 (en) * | 2017-09-15 | 2022-03-01 | Otis Elevator Company | Elevator emergency stop systems |
CN116238992A (zh) * | 2023-02-23 | 2023-06-09 | 伟龙意程智能科技(江苏)有限公司 | 一种具备节能作用的电梯光幕结构 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105197712A (zh) * | 2015-09-26 | 2015-12-30 | 方城君 | 电梯人员被困时自动呼救*** |
CN112010132B (zh) * | 2020-07-30 | 2021-12-17 | 佳格科技(浙江)股份有限公司 | 一种通过光幕识别电动车的方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2874806A (en) * | 1958-02-13 | 1959-02-24 | Westinghouse Electric Corp | Elevator control system |
US3379285A (en) * | 1964-02-28 | 1968-04-23 | Westinghouse Electric Corp | Low-friction speed-responsive sensor for elevator |
-
1973
- 1973-05-01 US US00356268A patent/US3814216A/en not_active Expired - Lifetime
-
1974
- 1974-04-11 CA CA197,472A patent/CA998195A/en not_active Expired
- 1974-04-19 NL NL7405309A patent/NL7405309A/xx not_active Application Discontinuation
- 1974-04-26 IT IT41580/74A patent/IT1010804B/it active
- 1974-04-29 BE BE1005915A patent/BE814307A/xx not_active IP Right Cessation
- 1974-04-30 BR BR3520/74A patent/BR7403520D0/pt unknown
- 1974-04-30 ES ES425801A patent/ES425801A1/es not_active Expired
- 1974-04-30 LU LU69962A patent/LU69962A1/xx unknown
- 1974-04-30 DE DE2420998A patent/DE2420998A1/de not_active Withdrawn
- 1974-05-01 JP JP49048355A patent/JPS5014052A/ja active Pending
- 1974-05-01 GB GB1908774A patent/GB1468037A/en not_active Expired
- 1974-05-02 FR FR7415293A patent/FR2228022B1/fr not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2874806A (en) * | 1958-02-13 | 1959-02-24 | Westinghouse Electric Corp | Elevator control system |
US3379285A (en) * | 1964-02-28 | 1968-04-23 | Westinghouse Electric Corp | Low-friction speed-responsive sensor for elevator |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4128141A (en) * | 1977-07-07 | 1978-12-05 | Westinghouse Electric Corp. | Elevator system |
US4356896A (en) * | 1979-11-28 | 1982-11-02 | Mitsubishi Denki Kabushiki Kaisha | Elevator terminal deceleration system |
US4503939A (en) * | 1983-08-19 | 1985-03-12 | Westinghouse Electric Corp. | Elevator system |
US4971178A (en) * | 1989-02-02 | 1990-11-20 | Inventio Ag | Elevator system with independent limiting of a speed pattern in terminal zones |
US20070227826A1 (en) * | 2004-09-09 | 2007-10-04 | Mitsubishi Electric Corporation | Elevator Apparatus |
US7637357B2 (en) * | 2004-09-09 | 2009-12-29 | Mitsubishi Electric Corporation | Elevator apparatus with sheave rotational speed difference determination for detecting an abnormality |
US7577495B2 (en) * | 2004-12-06 | 2009-08-18 | Siemens Aktiengesellschaft | Speed monitoring method in an automation system for a conveyor installation |
US20080262647A1 (en) * | 2004-12-06 | 2008-10-23 | Gerhard Gloss | Speed Monitoring Method In An Automation System For A Conveyor Installation |
WO2007007028A1 (en) * | 2005-07-09 | 2007-01-18 | Anthony Cuthbert | Traction arrangements |
WO2008006396A1 (de) * | 2006-07-14 | 2008-01-17 | Wittur Ag | Mehrfunktionale elektronische notbremsfangeinrichtung typ,,isg“ |
CN101287670B (zh) * | 2006-07-14 | 2011-03-30 | 维托公开股份有限公司 | 具有电子紧急安全钳的电梯 |
EP2112116A4 (en) * | 2007-02-15 | 2012-03-28 | Mitsubishi Electric Corp | LIFT SECURITY DEVICE |
US9033111B2 (en) | 2009-07-20 | 2015-05-19 | Otis Elevator Company | Elevator governor system |
US20160008939A1 (en) * | 2014-07-11 | 2016-01-14 | Fanuc Corporation | Machine tool with rotary table |
US10427262B2 (en) * | 2014-07-11 | 2019-10-01 | Fanuc Corporation | Machine tool with rotary table with suppressed divergence between estimate brake lifttime and actual brake lifetime |
US11261055B2 (en) * | 2017-09-15 | 2022-03-01 | Otis Elevator Company | Elevator emergency stop systems |
CN116238992A (zh) * | 2023-02-23 | 2023-06-09 | 伟龙意程智能科技(江苏)有限公司 | 一种具备节能作用的电梯光幕结构 |
CN116238992B (zh) * | 2023-02-23 | 2023-09-12 | 伟龙意程智能科技(江苏)有限公司 | 一种具备节能作用的电梯光幕结构 |
Also Published As
Publication number | Publication date |
---|---|
CA998195A (en) | 1976-10-05 |
JPS5014052A (xx) | 1975-02-14 |
IT1010804B (it) | 1977-01-20 |
NL7405309A (xx) | 1974-11-05 |
FR2228022B1 (xx) | 1976-10-15 |
DE2420998A1 (de) | 1974-11-21 |
ES425801A1 (es) | 1976-06-16 |
LU69962A1 (xx) | 1974-08-06 |
FR2228022A1 (xx) | 1974-11-29 |
GB1468037A (en) | 1977-03-23 |
BR7403520D0 (pt) | 1974-12-03 |
BE814307A (fr) | 1974-10-29 |
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