CN106044449A - Novel one-way self-reset speed limiter capable of being triggered automatically - Google Patents
Novel one-way self-reset speed limiter capable of being triggered automatically Download PDFInfo
- Publication number
- CN106044449A CN106044449A CN201610492322.1A CN201610492322A CN106044449A CN 106044449 A CN106044449 A CN 106044449A CN 201610492322 A CN201610492322 A CN 201610492322A CN 106044449 A CN106044449 A CN 106044449A
- Authority
- CN
- China
- Prior art keywords
- rope sheave
- friction wheel
- wheel
- friction pulley
- little friction
- 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.)
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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
- B66B5/044—Mechanical overspeed governors
-
- 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
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
Abstract
The invention discloses a novel one-way self-reset speed limiter capable of being triggered automatically. The novel one-way self-reset speed limiter is characterized in that a base is rotationally assembled with a large friction wheel; a small friction wheel is rotationally assembled on a rope sheave through a fixing part extending from the peripheral surface of the small friction wheel; a locating structure is rotationally assembled on the rope sheave and above the small friction wheel; a locating torsional spring allowing the locating structure to turn to the fixing part is arranged between the locating structure and the rope sheave; the locating structure is in elastic pushing fit with the rear end of the fixing part, so as to allow the small friction wheel to be far away from the large friction wheel; a trigger end is formed on the locating structure in a raised manner; a connecting rod, which pulls a braking pressing plate to allow the braking pressing plate to compress the rope sheave when the large friction wheel is engaged to the small friction wheel, is hinged to the large friction wheel; the connecting rod is arranged on the braking pressing plate in a clearance penetrating manner, and is in limiting fit with the two sides of the braking pressing plate; and a lifting reset rod is arranged on the small friction wheel in a raised manner. The novel one-way self-reset speed limiter adopts the large friction wheel and the small friction wheel for braking, so that once the rope sheave exceeds the speed, the large friction wheel can be occluded with the small friction wheel instantly without time delay.
Description
Technical field
The present invention relates to a kind of New Speed Limiter being used in elevator device, particularly relate to a kind of unidirectional limiter of speed, belong to
A kind of elevator component.
Background technology
Limiter of speed is the critical component of elevator safety, and of the prior art have a kind of such limiter of speed, including base, the end
Being equipped with rope sheave and ratchet by main axis on Zuo, the two ends of main shaft are arranged on base by bearing, and rope sheave spline is assembled
On main shaft, main shaft drives rope sheave to rotate, and is arranged with steel wire rope on rope sheave.The diameter of ratchet is less than the diameter of rope sheave, at rope
Being rotatably equipped with ratchet on the wheel face of wheel, be provided with torsion spring between ratchet and rope sheave, torsion spring is to Pawl Torsion so that pawl rotation
All the time having the trend of draw-in groove snap-fit with ratchet, ratchet is in free state when, ratchet and ratchet can be in clamping
State, on rope sheave also rotate be provided with location structure, location structure have one top pressure side, this pressure side top, top is pressed in ratchet
On so that ratchet is in the normal condition decontroling ratchet, has torsion spring between location structure and rope sheave, and torsion spring is that location structure carries
For compressing the power of ratchet, make ratchet overcome torsion spring power thereon, keep the state separated with ratchet, rope sheave is also rotatably equipped with
Two gravity drop hammers, ratchet and location structure be in the side of rope sheave, and two gravity drop hammers are in the other side of rope sheave.Two gravity
Hammer set-up mode on rope sheave is centrosymmetric mode, and the center of rotation of gravity drop hammer is not located at two ends, one end of gravity drop hammer
Quality more greatly tup end, other end quality is less for hammer handle end, is provided with pressure between hammer handle end and the rope sheave of a gravity drop hammer
Spring device, compression-spring device makes the tup end of gravity drop hammer be in the centre of rope sheave, the tup portion of this gravity drop hammer and another
Connecting between the hammer handle portion of individual gravity drop hammer and have pull bar, the two ends of pull bar are hinged with two gravity drop hammers respectively, in rope sheave normal rotation
Time, under the effect of compression-spring device, the tup portion of two gravity drop hammers is at the centre of rope sheave.At rope sheave overspeed operation
Time, under the influence of centrifugal force, two gravity drop hammers can overcome the spring force of compression-spring device to open, and two tups all can turn to rope sheave
Edge, two hammer handles turn to the center of rope sheave.Location structure has the triggering end through rope sheave, at the hammer of gravity drop hammer
When head turns to the outer rim of rope sheave, top pressure is triggered the triggering end of projection on end by gravity drop hammer so that location structure overcomes its torsion spring
Power rotates, and location structure compresses ratchet so that ratchet continues to rotate to the direction away from ratchet, along with the increase of rotation distance,
Location structure can decontrol ratchet, and ratchet is stuck with ratchet under the effect of its torsion spring, after location structure decontrols ratchet, and spine
Pawl will be crossed location structure and keep off location structure in turn so that location structure can not reset, and at this moment, location structure is at torsion spring
Pressure ratchet in top under the effect of power so that ratchet is in and the state of ratchet buckle reliably, in this state, if moving spine
Pawl makes it persistently rotate to the direction rotation away from ratchet, and ratchet will separate with location structure, and location structure is at its torsion spring
The lower return of effect.On base, the side in rope sheave is rotatably equipped with brake press plate, sets between side and the wheel face of brake press plate
Being equipped with connecting rod, one end of connecting rod is hinged at brake press plate, and the other end of connecting rod is hinged with the wheel face of ratchet, ratchet with
After ratchet is fastened togather, ratchet is followed rope sheave and is rotated, and ratchet drives brake press plate to press to rope sheave when rotating by connecting rod, from
And realize the braking of rope sheave.The limiter of speed being suitable in prior art is typically all such limiter of speed, this limiter of speed
Ratchet needs to forward the position stuck with ratchet to after falling could realize braking, needs the regular hour, it is impossible to brake at any time, tool
There is certain limitation.
Summary of the invention
It is an object of the invention to provide the unidirectional Self-resetting limiter of speed that a kind of New Energy triggers automatically, to provide a kind of novel
Unidirectional limiter of speed.
In order to realize object above, the present invention adopts the following technical scheme that the unidirectional runback that a kind of New Energy triggers automatically
Position limiter of speed, including base, base is provided with rope sheave by main axis, rope sheave side wheel face is provided with gravity drop hammer, the end
The side of seat rotates the brake press plate being provided with rope sheave, base is fixedly installed top pressure gravity drop hammer after powered up and makes gravity drop hammer
The electric magnet opened, base is also rotatably equipped with the big friction wheel coaxial with rope sheave, and rope sheave opposite side surface rotates assembling
Having little friction pulley, little friction pulley is rotated by the fixed part extended on its outer peripheral face and is assemblied on rope sheave, little friction pulley and rope sheave
Between be provided with and make little friction pulley turn to big friction wheel the torsion spring being pressed on big friction wheel, in little friction on the wheel face of rope sheave
The top of wheel is also rotatably equipped with location structure, is provided with and makes location structure turn to determining of fixed part between location structure and rope sheave
Position torsion spring, the follower head elastic top press-fit of location structure and fixed part make little friction pulley away from big friction wheel, on location structure
It is convexly equipped with and makes location structure overcome location torsion spring when the tup of gravity drop hammer turns to the outer rim of rope sheave with gravity drop hammer press-fit
The triggering end that power disengages with fixed part, triggers end and is passed by the space on rope sheave wheel face, big friction wheel is hinged with in big friction
Wheel pulls brake press plate to make it compress the connecting rod of rope sheave when engaging with little friction pulley, and connecting rod gap is located on brake press plate, even
Bar is the most spacing with the both sides of brake press plate to be coordinated, little friction pulley is convexly equipped with when the hammer handle of gravity drop hammer turns to the wheel rim of rope sheave with
The lifting release link little friction pulley being separated with big friction wheel and location structure being resetted is pressed on the hammer handle top of gravity drop hammer.
Rectangular channel is offered, the bearing of trend of rectangular channel and axial the one of big friction wheel on the wheel face of described big friction wheel
Cause.
Described little friction pulley is oval, and a longitudinal end of little friction pulley stretches to big friction wheel.
Described connecting rod passes and is arranged with stage clip in the part of brake press plate, and one end of stage clip is pressed on brake press plate,
The other end is pressed on the termination of connecting rod on the top splenium arranged.
The braking of the present invention uses big friction wheel and little friction pulley, and once hypervelocity occurs in rope sheave, and gravity drop hammer will touch
Sending out location structure, little friction pulley will fall and be pressed on big friction wheel, and two friction pulleys can be engaged moment, has no time to prolong
Late, it addition, the present invention is a kind of brand-new structure, it is provided that a kind of new unidirectional limiter of speed.Base is additionally provided with and can push up
Opening the electric magnet of gravity drop hammer, elevator master control system can control electric magnet energising at any time so that action of the present invention, allows car stop
Only.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the embodiment of the present invention；
Fig. 2 is the rope sheave in Fig. 1, big friction wheel and the installation diagram of little friction pulley；
Fig. 3 is the rearview of Fig. 2；
Fig. 4 is the three-dimensional installation diagram of the rope sheave in Fig. 1, big friction wheel and little friction pulley.
Detailed description of the invention
The embodiment of the unidirectional Self-resetting limiter of speed that a kind of New Energy triggers automatically, in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, its
Being equipped with rope sheave 2 and big friction wheel 3 by main axis on base 1, the two ends of main shaft are arranged on base 1 by bearing, rope
Taking turns 2 splines to be assemblied on main shaft, main shaft drives rope sheave 2 to rotate, and is arranged with steel wire rope on rope sheave.Big friction wheel 3 is to be set in
On main shaft, not with main axis, the diameter of big friction wheel 3 is less than the diameter of rope sheave 2, at the side surface pivots dress of rope sheave 2
Being furnished with little friction pulley 4, little friction pulley 4 is contained on rope sheave 2, little by being extended on fixed part rotation on its outer peripheral face
Being provided with torsion spring between friction pulley 4 and rope sheave 2, torsion spring gives little friction pulley 4 torsion so that little friction pulley 4 have all the time turn to big
The trend of friction pulley 3, little friction pulley 4 is in free state when, under the effect of torsion spring, little friction pulley 4 can be pressed in greatly
On friction pulley 3, rope sheave 2 also rotates and is provided with location structure 5, location structure here and prior art position for ratchet
The structure of location structure identical, location structure 5 is on the termination of fixed part so that little friction pulley is in away from big friction
The normal condition of wheel, also has torsion spring between location structure 5 and rope sheave 2, torsion spring provides for location structure 5 and is fixed portion
Power so that little friction pulley 4 overcomes torsion spring power thereon, keeps the normal condition separated with big friction wheel 3, rope sheave 2 also rotates
Being equipped with two gravity drop hammers 6, little friction pulley 4 and location structure 5 are in the side of rope sheave, and two gravity drop hammers 6 are in the another of rope sheave 2
Outer side.Two gravity drop hammers 6 set-up mode on rope sheave is centrosymmetric mode, and the center of rotation of gravity drop hammer 6 is not located at
Two ends, one end quality of gravity drop hammer 6 more greatly tup end, other end quality is less for hammer handle end, the hammer handle end of a gravity drop hammer 6
And being provided with compression-spring device between rope sheave 2, compression-spring device makes the tup end of gravity drop hammer be in the centre of rope sheave, heavy at this
Be connected and have pull bar between tup portion and the hammer handle portion of another gravity drop hammer of power hammer, the two ends of pull bar respectively with two gravity drop hammers 6
Hinged, when rope sheave 2 normal rotation, under the effect of compression-spring device, the tup portion of two gravity drop hammers 6 is in rope sheave 2
Heart position.When rope sheave 2 overspeed operation, under the influence of centrifugal force, two gravity drop hammers 6 can overcome the spring force of compression-spring device to open
Opening, two tups all can turn to the edge of rope sheave 2, and two hammer handles turn to the center of rope sheave.It is convexly equipped with triggering on location structure 5
End, triggers end and passes rope sheave 2, and when the tup of gravity drop hammer turns to the outer rim of rope sheave, top pressure is triggered end by gravity drop hammer so that location
Structure overcomes the power of its torsion spring to rotate, and location structure 5 compresses little friction pulley 4 so that little friction pulley 4 continues to away from big friction wheel
The direction of 3 rotates, and along with the increase of rotation distance, location structure 5 can decontrol little friction pulley 4, and little friction pulley 4 is at the work of its torsion spring
Being pressed under with on big friction wheel 3, after location structure 5 decontrols little friction pulley 4, it is anti-that little friction pulley 4 will cross location structure 5
Coming over to keep off location structure 5 so that location structure 5 can not reset, at this moment, it is little that location structure 5 pushes up pressure under the effect of torsion spring power
Friction pulley 4 so that little friction pulley 4 is in and the state of big friction wheel 3 buckle reliably, in this state, if moving little
Friction pulley 4 makes it persistently rotate to the direction rotation away from big friction wheel 3, and little friction pulley 4 will separate with location structure 5, fixed
Bit architecture 5 is return under the effect of its torsion spring, decontrols little friction pulley 4, and location structure 5 will position with little friction pulley 4.At base 1
On be rotatably equipped with brake press plate 7 in the side of rope sheave 2, be provided with between side and the wheel face of big friction wheel of brake press plate 7
Connecting rod 8, the other end of connecting rod 8 is hinged with the wheel face of big friction wheel, and the other end of connecting rod 8 is offered by the free end of brake press plate 7
Slide opening in pass, connecting rod 8 and slide opening matched in clearance, connecting rod 8 passes and is arranged with stage clip 9 in the part of slide opening, the upper end of stage clip 9
Top is pressed on the top splenium 10 that the axis of guide is arranged, and the top, lower end of stage clip 9 is pressed on brake press plate 7.Due to connecting rod 8 and slide opening gap
Coordinate, so, can relatively rotate between connecting rod 8 and brake press plate 7.Here its actually tabular of connecting rod 8, with brake press plate
The one end coordinated is round bar, and connecting rod tabular partial width is more than the diameter of round bar part, so both junctions, plate portion
Just extend to outside the side face at round bar position, and, the diameter in the hole that brake press plate coordinates with connecting rod is also to compare plate-like portion
The width divided is little, and so, plate portion has the spacing cooperation in side of brake press plate, and the termination of connecting rod is pressed with braking
The opposite side of plate passes through the spacing cooperation of stage clip.
Base is additionally provided with electric magnet, pressure gravity drop hammer can be pushed up in electric magnet energising so that gravity drop hammer opens and backs down
Positioner so that little friction pulley engages with big friction wheel, limiter of speed action, elevator stops.
Offering rectangular channel on the wheel face of big friction wheel, the bearing of trend of rectangular channel is axial consistent with big friction wheel, square
The groove depth of shape groove is to be far smaller than the well width of rectangular channel, the existence of rectangular channel can increase big friction wheel and little friction pulley it
Between friction pulley make both occlusion relatively reliable.
Little friction pulley 4 is oval, and a longitudinal end of little friction pulley 4 is stretched to big friction wheel 3, so be can ensure that size
Friction pulley can mesh together reliably.
Being convexly equipped with lifting release link 11 on little friction pulley 4, lifting release link 11 is perpendicular to the wheel face of rope sheave 2, here
Rope sheave 2 fills for wheel hub, it is simply that has wheel rim, has core wheel, is linked to be an entirety, lifting release link by spoke between core wheel and wheel rim
11 are passed by between two spokes, offer functional hole 12 on the hammer handle of gravity drop hammer 6, lifting release link 11 by two spokes it
Between pass after passed by functional hole 12 again.The hammer handle of gravity drop hammer 6 is fixed by being located in helicitic texture in functional hole 12
There is top pinch roller 13, when gravity drop hammer 6 resets, namely when the hammer handle of gravity drop hammer 6 turns to the wheel rim of rope sheave 2, push up pinch roller 13 meeting
Top pressure lifting release link 11, namely drives little friction pulley 4 to make it persistently rotate to the direction away from big friction wheel 3, little friction
Wheel 4 will separate with location structure 5, and location structure 5 is return under the effect of its location torsion spring, at this moment decontrols little friction pulley 4, fixed
Bit architecture 5 will position with little friction pulley 4, and both are returned to original state, it is achieved automatically reseting of little friction pulley 4.
Owing to lifting release link 11 is functional hole 12 on the hammer handle of gravity drop hammer 6, in motor process, lifting release link 11
Can move relative to the hammer handle of gravity drop hammer 6, thus functional hole 12 need to have dodge lifting release link 11 dodge part, dodge
Part is so that lifting release link 11 moves freely relative to gravity drop hammer 6.
Big friction wheel in the present embodiment is columned, and little friction pulley is oval column, both friction pulleys, two
The occlusion of person is realized by frictional force, here, after little friction pulley is pressed on big friction wheel, if little friction pulley and rope
Torsion spring between wheel causes the little friction pulley to the pressure of big friction wheel to be: F；Coefficient of friction between big friction wheel and little friction pulley
For μ；Little friction pulley is respectively as follows: L1 relative to the center of rotation of rope sheave to the tangent line at the point of contact of size friction pulley and the distance of normal
And L2, then, the occlusion condition of big friction wheel and little friction pulley is: F μ L1 ＞ FL2, i.e. μ L1 ＞ L2, otherwise, and size friction pulley
Will be unable to engagement, then, when size friction pulley engages, it will be appreciated by those skilled in the art that needs meet a upper condition.
Differing only in spine between the individual event limiter of speed in the present embodiment and individual event limiter of speed of the prior art
Wheel, ratchet have changed big friction wheel and little friction pulley respectively into, and it is just the same with structure.
The present embodiment is according to illustrating of making the present invention, and is not limitation of the invention, need not attached
Belonging to the function in claim, corresponding structure can be not provided with in other embodiments.
Any technical characteristic to the present invention carries out the technical scheme obtained by equivalent and falls within present invention protection
Scope.
Claims (4)
1. the unidirectional Self-resetting limiter of speed that New Energy triggers automatically, including base, base is provided with by main axis
Rope sheave, rope sheave side wheel face is provided with gravity drop hammer, and the side of base rotates the brake press plate being provided with rope sheave, fixing on base
It is provided with the electric magnet that pressure gravity drop hammer in top makes gravity drop hammer open after powered up, it is characterised in that: also it is rotatably equipped with on base
The big friction wheel coaxial with rope sheave, rope sheave opposite side surface is rotatably equipped with little friction pulley, and little friction pulley passes through its outer peripheral face
The fixed part of upper extension rotates and is assemblied on rope sheave, is provided with and makes little friction pulley turn to big friction wheel between little friction pulley and rope sheave
And the torsion spring being pressed on big friction wheel, the wheel face of rope sheave is also rotatably equipped with above little friction pulley location structure, fixed
The follower head of the location torsion spring making location structure turn to fixed part, location structure and fixed part it is provided with between bit architecture and rope sheave
Elastic top press-fit makes little friction pulley away from big friction wheel, location structure is convexly equipped with the tup at gravity drop hammer and turns to outside rope sheave
Make with gravity drop hammer press-fit location structure overcome the triggering end that location torsion spring power disengages with fixed part during edge, trigger end by restricting
Space on wheel wheel face passes, and big friction wheel is hinged with and pulls brake press plate to make it when big friction wheel engages with little friction pulley
Compressing the connecting rod of rope sheave, connecting rod gap is located on brake press plate, and connecting rod is the most spacing with the both sides of brake press plate to be coordinated, little friction
It is convexly equipped with on wheel when the hammer handle of gravity drop hammer turns to the wheel rim of rope sheave to press with the hammer handle top of gravity drop hammer and makes little friction pulley and rub greatly
Wipe the lifting release link that wheel separates and location structure is resetted.
The unidirectional Self-resetting limiter of speed that New Energy the most according to claim 1 triggers automatically, it is characterised in that: described is big
Offering rectangular channel on the wheel face of friction pulley, the bearing of trend of rectangular channel is axial consistent with big friction wheel.
The unidirectional Self-resetting limiter of speed that New Energy the most according to claim 1 and 2 triggers automatically, it is characterised in that: described
Little friction pulley be oval, a longitudinal end of little friction pulley stretches to big friction wheel.
The unidirectional Self-resetting limiter of speed that New Energy the most according to claim 3 triggers automatically, it is characterised in that: described company
Bar passes and is arranged with stage clip in the part of brake press plate, and one end of stage clip is pressed on brake press plate, and the other end is pressed on connecting rod
Termination on arrange top splenium on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610492322.1A CN106044449A (en) | 2016-06-29 | 2016-06-29 | Novel one-way self-reset speed limiter capable of being triggered automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610492322.1A CN106044449A (en) | 2016-06-29 | 2016-06-29 | Novel one-way self-reset speed limiter capable of being triggered automatically |
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| Publication Number | Publication Date |
|---|---|
| CN106044449A true CN106044449A (en) | 2016-10-26 |
Family
ID=57166084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610492322.1A Pending CN106044449A (en) | 2016-06-29 | 2016-06-29 | Novel one-way self-reset speed limiter capable of being triggered automatically |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11365091B2 (en) | 2018-12-04 | 2022-06-21 | Otis Elevator Company | Overspeed protection switch, overspeed governor assembly and elevator system |
Citations (5)
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|---|---|---|---|---|
| CN1319550A (en) * | 2000-04-14 | 2001-10-31 | 中国建筑科学研究院建筑机械化研究分院 | Bidirectional speed limiter for elevator |
| CN202440201U (en) * | 2012-02-08 | 2012-09-19 | 阳西县电梯配件有限公司 | Bidirectional speed limiter |
| CN104118784A (en) * | 2014-06-09 | 2014-10-29 | 宁波欧菱电梯配件有限公司 | Leveling anti-slip method and device of lift with car |
| CN104709792A (en) * | 2015-03-31 | 2015-06-17 | 西继迅达（许昌）电梯有限公司 | One-way speed limiter with automatic resetting pawl |
| CN105217407A (en) * | 2015-10-23 | 2016-01-06 | 西继迅达（许昌）电梯有限公司 | Subtract stroke unidirectional automatic anti-running car speed limiting system |
-
2016
- 2016-06-29 CN CN201610492322.1A patent/CN106044449A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1319550A (en) * | 2000-04-14 | 2001-10-31 | 中国建筑科学研究院建筑机械化研究分院 | Bidirectional speed limiter for elevator |
| CN202440201U (en) * | 2012-02-08 | 2012-09-19 | 阳西县电梯配件有限公司 | Bidirectional speed limiter |
| CN104118784A (en) * | 2014-06-09 | 2014-10-29 | 宁波欧菱电梯配件有限公司 | Leveling anti-slip method and device of lift with car |
| CN104709792A (en) * | 2015-03-31 | 2015-06-17 | 西继迅达（许昌）电梯有限公司 | One-way speed limiter with automatic resetting pawl |
| CN105217407A (en) * | 2015-10-23 | 2016-01-06 | 西继迅达（许昌）电梯有限公司 | Subtract stroke unidirectional automatic anti-running car speed limiting system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11365091B2 (en) | 2018-12-04 | 2022-06-21 | Otis Elevator Company | Overspeed protection switch, overspeed governor assembly and elevator system |
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Application publication date: 20161026 |
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