CA1236777A - Lift speed limiter - Google Patents
Lift speed limiterInfo
- Publication number
- CA1236777A CA1236777A CA000508418A CA508418A CA1236777A CA 1236777 A CA1236777 A CA 1236777A CA 000508418 A CA000508418 A CA 000508418A CA 508418 A CA508418 A CA 508418A CA 1236777 A CA1236777 A CA 1236777A
- Authority
- CA
- Canada
- Prior art keywords
- axle
- drive element
- weights
- centrifugal
- speed
- 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
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- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
ABSTRACT
A speed limiter for an elevator has a rope sheave driven by a rope connected with a catch device.
The speed limiter includes a pre-set brake for a brake element mounted on an axle for rotation relative to the axle against the braking effect, the rope sheave rotatably carrying two diametrically opposed eccentric cams which are interconnected by centrifugal weights eccentrically pivoted thereto. The eccentric cams are turnable by centrifugal weights radially outwardly of the axle, whereby the weights cause the cams to engage with a brake disk which is held fast through friction contact between two disks fixedly mounted on the axle and urged against each other by presettable springs. The eccentric cams have a return spring which, when a given triggering speed of the rope sheave is attained, engages with the rotatable braking element.
A speed limiter for an elevator has a rope sheave driven by a rope connected with a catch device.
The speed limiter includes a pre-set brake for a brake element mounted on an axle for rotation relative to the axle against the braking effect, the rope sheave rotatably carrying two diametrically opposed eccentric cams which are interconnected by centrifugal weights eccentrically pivoted thereto. The eccentric cams are turnable by centrifugal weights radially outwardly of the axle, whereby the weights cause the cams to engage with a brake disk which is held fast through friction contact between two disks fixedly mounted on the axle and urged against each other by presettable springs. The eccentric cams have a return spring which, when a given triggering speed of the rope sheave is attained, engages with the rotatable braking element.
Description
~3~'7~
The present invention relates to elevators and more specifically to a speed limiter Eor an elevator hav;ng a catch device such as an emergency saEety arrest to prevent free-fall of the elevator cage.
Passenger and freight elevators are usually equipped with a free-Eall preventing sa~ety arrest which is triggered by the action of a speed limiter when the normal travelling velocity of the elevator cage is exceeded by a predetermined speed during downward travel ~0 of the cage. The triggering of the safety arrest is effected by a safety rope which drives the speed limiter.
In this regard, the speed limiter includes a pulley about which the safety rope is entrained. The safety arrest is sensitive to and actuated by braking and Eorces induced in the safety rope by the speed limiter.
In prior art speed limiters, in the event of downward velocities in excess of saEe levels, there is created by means of rollers or eccentrically-mounted cams a force-induced connection between the ~afety rope pulley and a stationary cast bell whereby the triggering of the safety arrest is initiated by the tension or braking force in the safety rope as it slides over or through the groove in the now stationary pulley of the speed limiter.
However, the braking force in the rope is highly variable, and as a result there is often a jerky stopping of the pulley, resulting in looping of the rope and a delay in the onset of the braking effect.
It is an objecl; of the present invention to improve upon and mitigate the drawbacks of the prior art and to provide an improved speed limiter.
~ccording to the present invention then, there is provided a speed limiter for an elevator provided with a catch device, wherein on a stationary axle is rotatably carried a rope sheave that can be driven by a rope connected with the catch device, wherein the speed limiter comprises a pre-set brake for a brake element mounted on the axle for rotation with reference to the axle against the braking effect the rope sheave rotatably carrying two ~3~
diametrically opposed eccentric cams which are interconnected by centrifugal weights eccentrically pivoted thereto, the eccentric cams being turnable by movement of the centrifugal weights radially outwardly oE
the axlel whereby the weights cause the cams to engage with a brake disk which is held fast through friction contact between two disks fixedly mounted on the axle and urged against each other by presettable springs, the eccentric cams being turnable against the force of a return spring which, when a given triggering speed of the rope sheave is attained, engages with the rotatable braking element.
The return spring rnay be disposed in the area of the centre of gravity of the centriEugal weights and is fixed in a spring holder freely movable with reference to the axle.
Each centrifugal weight may have a rectangular aperture, provided in the area of the centre of gravity, for housing the return spring, and a spring holder having a projection extending into the rectangular aperture in the centrifugal weight, the return spring comprising a compression spring which rests against a projection of the spring holder and also against an adjustment nut disposed on a spring bolt provided in the rectangular aperture.
Preferably, each centrifugal weight carries at least one switching cam which, on attainment of a given speed of rotation of the rope sheave which is below the triygering speed, comes into engagement with a switch mounted on a stationary holder to interrupt the control current of the lift.
The invention Eurther provides the colnbination of a rotatable drive element for an elevator and apparatus ~or regulating the rotational speed of the drive element, the drive element being supported Eor rotation on, and about, a fixed shaft, comprising, annular braking means including first and second spaced parallel portions fixedly mounted on the shaft and biased together to Eorm a `~
~$~7~
clamping means, and an annular third portion, supported for rotation about the shaft and the first and second portions, -the third portion including a radially outer engagement surface and a radially inner part disposed between and fractionally engaging the clamping means Eormed by the first and second portions, at least two annular means, disposed radially outwardly of the annular third portion, for selectively engaging the th.i.rd portion engagement surface, pin means fixedly secured to the drive element for each oE the engaging means, each of the engaging means being eccentrically supported by the pin means, in spaced relation to the drive element, for rotation about the pin means, whereby each of the engaging means can be rotated into a position of engagement with the third portion engagement surface, and centrlfugal means, connected to each oE the engaging means and supported for movement radially outwardly relative to the shaft in response to the rotational speed of the drive element, for rotating the engaging means about the pin means into the position of engagement when the rotational speed of the drive element exceeds a predetermined value, whereby when the predetermined speed is at-tained, and the engaging means is rotated into the position of engagement, the drive element is effectively connected with the third portion, and the frictional engagement of the third portion with the clamping means causes reduction oE
rotation of the drive element.
Preferably, each oE the engaging means includes connection points located Oll di.ametri.cally opposi-te sides of the pi.n means, and the centrifugal means comprise at least two weights, each of the weights being connected to the engaging means at the connection points, whereby when the predetermined speed is attained, the weights are caused to be moved in diametrically opposi.te directions thereby effecting rotation of the engaging means about the . pin means into the position of engagement with the third portion engagement surface.
! 7 ~
A preferred embodiment further comprises means for supplying power to the elevator, and means for selectively interrupting the supply oE power, the interrupting means being loca-ted proximal to the regulating apparatus, wherein the centrifugal means Eurther comprises peripheral cam portions Eor engayement with the interrupting means to cut oEf the power to the eLevator when a second predetermined rotational speed of the drive element, less that the Eirst predetermined speed, is attained.
Preferred embodiments of the present inven-tion will now be described in greater detail and will be better understood when read with reference to the following drawings in which:
15Figure 1 is a side elevational, partially cross~
sectional view of the speed limiter described hereinbelow;
Figure 2 is a cross-sectional view along the line Il-II from Figure l;
Figure 3 is a partially schematic front 20eleva-tional view of the speed limiter in a normal, non-braking contracted state; and Figure 4 is a front elevational partially schematic view oE -the speed limiter in a braking, centrifugally expanded, braking mode.
25An axle 2 is fixedly connected, such as by welding, to a bracket 1. A pulley 3 for the elevator safety rope (not shown) is rotatably mounted on axle 2 by means oE a bearing ~. Adjacent pulley 3 on the axle is a brake S consisting of a caliper having opposed disks 8 and 3010 welded to axle 2 and a circular brake disk 6 which, in transverse cross-section seen most clearly in Figure 1, is somewhat T-shaped. The lower leg of the T is held Erictionally between brake linings 7 and 9 provided on disks 8 and 10, respectively, and the cross stroke oE the 35T Eorms an outer annular brake surEace 6a. Brake disk 6 is rotatable relative to axle 2, whereas oE course disks 8 and 10 are not. Disks 8 and 10 are urged -together to grip bralce disk 6 by ~means oE bolts 11 which cooperate with ~3$~
adjustable nuts 13 and cup springs 12 pretensioned by means of the adjusting nuts. As will be appreciated, nuts 13 are used to set the braking force between disks 8 and 10 of the caliper and brake disk 6.
On the side oE pulley 3 adjacent brake 5 there are two pin members 1~ and 14' positioned diametrically opposite one another on the pulley for supporting eccentric cams 15 and 15', respectively. Cams 15 and 15' may he circular/ as shown in the drawings, and are eccentrically mounted on pins 14 and 1~' Eor rotation between a normal non-operative position shown most clearly in Figure 3, and a brake engaging posi-tion seen most clearly in Figure 4. Cams 15 and 15' are interconnected by means of two curved centriEugal weights 16 and 16' disposed on opposite sides of axle 2. Each weight is pivotally connected at one end to an eccentric pin 17, 17' on one of the cams and at the other end to an eccentric pin 18l 1~' on the other of the cams. Formed in each weight adjacent or proximal to its centre oE gravi-ty is an aperture 19, 19' which may be rectangular in outline as shown with the longitudinal axis thereof extending, generall~ speaking, radially outwardly from axle 2. A
spring bolt 21, 21' is disposed within each aperture to support a resilient compression spring 20, 20', the radially inner ends oE which abut adjustable nuts 22, 22' provided on bolts 21, 21', and the radially outer ends of which engage a flange member 23, 23' extending into the apertures and formed at the ends oE a Elexible spring holder 24. The spriny holder maintains springs 20 and 20' in a compressed condition so that weights 16 ~nd 16' are normalLy resiliently urged towards one another to assume the retracted positions shown most clearly in Figure 3.
~s will be appreciated, springs 20 and 20', ac-ting through weights 16, 16' also resiliently urge cams 15 and 15' into the normal, non-operative positions thereof also shown in Fiyure 3. The central portion 25 of spring holder 24 is hollowed out or open to provide clearance around axle 2 to . ~
~3~
permit the spring holder to rotate freely with weights 16, 16' and pulley 3.
Each of weights 16, 16' include on an outer peripheral e~ge thereof a projection 26, 26' such as a cam S surface for actuating the arm 28 of a switch 27 mounted on bracket 1, the switch 27 controlling, for instance, power t:o the elevator hoist motors. Contact between cams 26, 26' and switch arm 28 will occur at a predetermined centriEugal expansion of the weights programmed for safety reasons to occur, if desired, at a rotational speed less than that required to cause a triygering oE the elevator's safety arrest.
In operation, :Eree-fall of the eleva-tor cage, or any fall in excess of safe de~cent speedsl will cause the safety rope to spin pulley 3 a-t a speed sufficient to cause the centrifugal expansion of weights 16, 15', thereby rotating cams 15, 15' from their non-operative positions shown in Figure 3 to the brake engaginy positions thereof as shown in Figure 4. The outer surEaces of the cams frictionally engage the annual brake surface 6a and the resulting braking effect, acti.ng through pulley 3 on the safety rope causes actuation of the elevator's safety arrest.
Frictional contact between cams 15l 15' and brake surf ace 6a may be improved or enhanced by roughening, knurling, treating or coating surface 6a in any known suitable fashion for this purpose. Further, to prevent or avoid over-rotation of the carns, each cam may be provided with a stop member such as a screw or bolt 29 e~tending above the surface of each cam.
~he above-described specific embodiments of the invention have been set forth for the purposes of illustrati.on. It will be apparent to those skilled in the art that various modif ications may be made in the structure of the speed limiter without departing from the principles of this invention as i-t is described and ,!,`'\t~' disclosed herein. For this reasonl it is not intended ,',r~ ~.
'7 that the invention should be limited other than by the scope of the appended claims.
; '
The present invention relates to elevators and more specifically to a speed limiter Eor an elevator hav;ng a catch device such as an emergency saEety arrest to prevent free-fall of the elevator cage.
Passenger and freight elevators are usually equipped with a free-Eall preventing sa~ety arrest which is triggered by the action of a speed limiter when the normal travelling velocity of the elevator cage is exceeded by a predetermined speed during downward travel ~0 of the cage. The triggering of the safety arrest is effected by a safety rope which drives the speed limiter.
In this regard, the speed limiter includes a pulley about which the safety rope is entrained. The safety arrest is sensitive to and actuated by braking and Eorces induced in the safety rope by the speed limiter.
In prior art speed limiters, in the event of downward velocities in excess of saEe levels, there is created by means of rollers or eccentrically-mounted cams a force-induced connection between the ~afety rope pulley and a stationary cast bell whereby the triggering of the safety arrest is initiated by the tension or braking force in the safety rope as it slides over or through the groove in the now stationary pulley of the speed limiter.
However, the braking force in the rope is highly variable, and as a result there is often a jerky stopping of the pulley, resulting in looping of the rope and a delay in the onset of the braking effect.
It is an objecl; of the present invention to improve upon and mitigate the drawbacks of the prior art and to provide an improved speed limiter.
~ccording to the present invention then, there is provided a speed limiter for an elevator provided with a catch device, wherein on a stationary axle is rotatably carried a rope sheave that can be driven by a rope connected with the catch device, wherein the speed limiter comprises a pre-set brake for a brake element mounted on the axle for rotation with reference to the axle against the braking effect the rope sheave rotatably carrying two ~3~
diametrically opposed eccentric cams which are interconnected by centrifugal weights eccentrically pivoted thereto, the eccentric cams being turnable by movement of the centrifugal weights radially outwardly oE
the axlel whereby the weights cause the cams to engage with a brake disk which is held fast through friction contact between two disks fixedly mounted on the axle and urged against each other by presettable springs, the eccentric cams being turnable against the force of a return spring which, when a given triggering speed of the rope sheave is attained, engages with the rotatable braking element.
The return spring rnay be disposed in the area of the centre of gravity of the centriEugal weights and is fixed in a spring holder freely movable with reference to the axle.
Each centrifugal weight may have a rectangular aperture, provided in the area of the centre of gravity, for housing the return spring, and a spring holder having a projection extending into the rectangular aperture in the centrifugal weight, the return spring comprising a compression spring which rests against a projection of the spring holder and also against an adjustment nut disposed on a spring bolt provided in the rectangular aperture.
Preferably, each centrifugal weight carries at least one switching cam which, on attainment of a given speed of rotation of the rope sheave which is below the triygering speed, comes into engagement with a switch mounted on a stationary holder to interrupt the control current of the lift.
The invention Eurther provides the colnbination of a rotatable drive element for an elevator and apparatus ~or regulating the rotational speed of the drive element, the drive element being supported Eor rotation on, and about, a fixed shaft, comprising, annular braking means including first and second spaced parallel portions fixedly mounted on the shaft and biased together to Eorm a `~
~$~7~
clamping means, and an annular third portion, supported for rotation about the shaft and the first and second portions, -the third portion including a radially outer engagement surface and a radially inner part disposed between and fractionally engaging the clamping means Eormed by the first and second portions, at least two annular means, disposed radially outwardly of the annular third portion, for selectively engaging the th.i.rd portion engagement surface, pin means fixedly secured to the drive element for each oE the engaging means, each of the engaging means being eccentrically supported by the pin means, in spaced relation to the drive element, for rotation about the pin means, whereby each of the engaging means can be rotated into a position of engagement with the third portion engagement surface, and centrlfugal means, connected to each oE the engaging means and supported for movement radially outwardly relative to the shaft in response to the rotational speed of the drive element, for rotating the engaging means about the pin means into the position of engagement when the rotational speed of the drive element exceeds a predetermined value, whereby when the predetermined speed is at-tained, and the engaging means is rotated into the position of engagement, the drive element is effectively connected with the third portion, and the frictional engagement of the third portion with the clamping means causes reduction oE
rotation of the drive element.
Preferably, each oE the engaging means includes connection points located Oll di.ametri.cally opposi-te sides of the pi.n means, and the centrifugal means comprise at least two weights, each of the weights being connected to the engaging means at the connection points, whereby when the predetermined speed is attained, the weights are caused to be moved in diametrically opposi.te directions thereby effecting rotation of the engaging means about the . pin means into the position of engagement with the third portion engagement surface.
! 7 ~
A preferred embodiment further comprises means for supplying power to the elevator, and means for selectively interrupting the supply oE power, the interrupting means being loca-ted proximal to the regulating apparatus, wherein the centrifugal means Eurther comprises peripheral cam portions Eor engayement with the interrupting means to cut oEf the power to the eLevator when a second predetermined rotational speed of the drive element, less that the Eirst predetermined speed, is attained.
Preferred embodiments of the present inven-tion will now be described in greater detail and will be better understood when read with reference to the following drawings in which:
15Figure 1 is a side elevational, partially cross~
sectional view of the speed limiter described hereinbelow;
Figure 2 is a cross-sectional view along the line Il-II from Figure l;
Figure 3 is a partially schematic front 20eleva-tional view of the speed limiter in a normal, non-braking contracted state; and Figure 4 is a front elevational partially schematic view oE -the speed limiter in a braking, centrifugally expanded, braking mode.
25An axle 2 is fixedly connected, such as by welding, to a bracket 1. A pulley 3 for the elevator safety rope (not shown) is rotatably mounted on axle 2 by means oE a bearing ~. Adjacent pulley 3 on the axle is a brake S consisting of a caliper having opposed disks 8 and 3010 welded to axle 2 and a circular brake disk 6 which, in transverse cross-section seen most clearly in Figure 1, is somewhat T-shaped. The lower leg of the T is held Erictionally between brake linings 7 and 9 provided on disks 8 and 10, respectively, and the cross stroke oE the 35T Eorms an outer annular brake surEace 6a. Brake disk 6 is rotatable relative to axle 2, whereas oE course disks 8 and 10 are not. Disks 8 and 10 are urged -together to grip bralce disk 6 by ~means oE bolts 11 which cooperate with ~3$~
adjustable nuts 13 and cup springs 12 pretensioned by means of the adjusting nuts. As will be appreciated, nuts 13 are used to set the braking force between disks 8 and 10 of the caliper and brake disk 6.
On the side oE pulley 3 adjacent brake 5 there are two pin members 1~ and 14' positioned diametrically opposite one another on the pulley for supporting eccentric cams 15 and 15', respectively. Cams 15 and 15' may he circular/ as shown in the drawings, and are eccentrically mounted on pins 14 and 1~' Eor rotation between a normal non-operative position shown most clearly in Figure 3, and a brake engaging posi-tion seen most clearly in Figure 4. Cams 15 and 15' are interconnected by means of two curved centriEugal weights 16 and 16' disposed on opposite sides of axle 2. Each weight is pivotally connected at one end to an eccentric pin 17, 17' on one of the cams and at the other end to an eccentric pin 18l 1~' on the other of the cams. Formed in each weight adjacent or proximal to its centre oE gravi-ty is an aperture 19, 19' which may be rectangular in outline as shown with the longitudinal axis thereof extending, generall~ speaking, radially outwardly from axle 2. A
spring bolt 21, 21' is disposed within each aperture to support a resilient compression spring 20, 20', the radially inner ends oE which abut adjustable nuts 22, 22' provided on bolts 21, 21', and the radially outer ends of which engage a flange member 23, 23' extending into the apertures and formed at the ends oE a Elexible spring holder 24. The spriny holder maintains springs 20 and 20' in a compressed condition so that weights 16 ~nd 16' are normalLy resiliently urged towards one another to assume the retracted positions shown most clearly in Figure 3.
~s will be appreciated, springs 20 and 20', ac-ting through weights 16, 16' also resiliently urge cams 15 and 15' into the normal, non-operative positions thereof also shown in Fiyure 3. The central portion 25 of spring holder 24 is hollowed out or open to provide clearance around axle 2 to . ~
~3~
permit the spring holder to rotate freely with weights 16, 16' and pulley 3.
Each of weights 16, 16' include on an outer peripheral e~ge thereof a projection 26, 26' such as a cam S surface for actuating the arm 28 of a switch 27 mounted on bracket 1, the switch 27 controlling, for instance, power t:o the elevator hoist motors. Contact between cams 26, 26' and switch arm 28 will occur at a predetermined centriEugal expansion of the weights programmed for safety reasons to occur, if desired, at a rotational speed less than that required to cause a triygering oE the elevator's safety arrest.
In operation, :Eree-fall of the eleva-tor cage, or any fall in excess of safe de~cent speedsl will cause the safety rope to spin pulley 3 a-t a speed sufficient to cause the centrifugal expansion of weights 16, 15', thereby rotating cams 15, 15' from their non-operative positions shown in Figure 3 to the brake engaginy positions thereof as shown in Figure 4. The outer surEaces of the cams frictionally engage the annual brake surface 6a and the resulting braking effect, acti.ng through pulley 3 on the safety rope causes actuation of the elevator's safety arrest.
Frictional contact between cams 15l 15' and brake surf ace 6a may be improved or enhanced by roughening, knurling, treating or coating surface 6a in any known suitable fashion for this purpose. Further, to prevent or avoid over-rotation of the carns, each cam may be provided with a stop member such as a screw or bolt 29 e~tending above the surface of each cam.
~he above-described specific embodiments of the invention have been set forth for the purposes of illustrati.on. It will be apparent to those skilled in the art that various modif ications may be made in the structure of the speed limiter without departing from the principles of this invention as i-t is described and ,!,`'\t~' disclosed herein. For this reasonl it is not intended ,',r~ ~.
'7 that the invention should be limited other than by the scope of the appended claims.
; '
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A speed limiter for an elevator provided with a catch device, wherein on a stationary axle is rotatably carried a rope sheave that can be driven by a rope connected with the catch device, wherein the speed limiter comprises:
a pre-set brake for a brake element mounted on said axle for rotation with reference to the axle against the braking effect;
the rope sheave rotatably carrying two diametrically opposed eccentric cams which are interconnected by centrifugal weights eccentrically pivoted thereto, said eccentric cams being turnable by movement of the centrifugal weights radially outwardly of said axle, whereby said weights cause said cams to engage with a brake disk which is held fast through friction contact between two disks fixedly mounted on the axle and urged against each other by presettable springs;
said eccentric cams being turnable against the force of a return spring which, when a given triggering speed of the rope sheave is attained, engages with the rotatable braking element.
a pre-set brake for a brake element mounted on said axle for rotation with reference to the axle against the braking effect;
the rope sheave rotatably carrying two diametrically opposed eccentric cams which are interconnected by centrifugal weights eccentrically pivoted thereto, said eccentric cams being turnable by movement of the centrifugal weights radially outwardly of said axle, whereby said weights cause said cams to engage with a brake disk which is held fast through friction contact between two disks fixedly mounted on the axle and urged against each other by presettable springs;
said eccentric cams being turnable against the force of a return spring which, when a given triggering speed of the rope sheave is attained, engages with the rotatable braking element.
2. The speed limiter according to Claim 1, wherein said return spring coordinated with each centrifugal weight is disposed in the area of the centre of gravity of the centrifugal weights and is fixed in a spring holder freely movable with reference to the axle.
3. The speed limiter according to Claim 2, wherein each centrifugal weight has a rectangular aperture, provided in the area of said centre of gravity, for housing the return spring, and a spring holder having a projection extending into the rectangular aperture in the centrifugal weight, said return spring comprising a compression spring which rests against a projection of the spring holder and also against an adjustment nut disposed on a spring bolt provided in said rectangular aperture.
4. The combination of a rotatable drive element for an elevator and apparatus for regulating the rotational speed of said drive element, the drive element being supported for rotation on, and about, a fixed shaft, comprising:
annular braking means including first and second spaced parallel portions fixedly mounted on said shaft and biased together to form a clamping means, and an annular third portion, supported for rotation about said shaft and said first and second portions, said third portion including a radially outer engagement surface and a radially inner part disposed between and fractionally engaging said clamping means formed by said first and second portions;
at least two annular means, disposed radially outwardly of said annular third portion, for selectively engaging said third portion engagement surface;
pin means fixedly secured to said drive element for each of said engaging means, each of said engaging means being eccentrically supported by said pin means, in spaced relation to said drive element, for rotation about said pin means, whereby each of said engaging means can be rotated into a position of engagement with said third portion engagement surface; and centrifugal means, connected to each of said engaging means and supported for movement radially outwardly relative to said shaft in response to the rotational speed of said drive element, for rotating said engaging means about said pin means into said position of engagement when said rotational speed of said drive element exceeds a predetermined value;
whereby when said predetermined speed is attained, and said engaging means is rotated into said position of engagement, said drive element is effectively connected with said third portion, and the frictional engagement of said third portion with said clamping means causes reduction of rotation of said drive element.
annular braking means including first and second spaced parallel portions fixedly mounted on said shaft and biased together to form a clamping means, and an annular third portion, supported for rotation about said shaft and said first and second portions, said third portion including a radially outer engagement surface and a radially inner part disposed between and fractionally engaging said clamping means formed by said first and second portions;
at least two annular means, disposed radially outwardly of said annular third portion, for selectively engaging said third portion engagement surface;
pin means fixedly secured to said drive element for each of said engaging means, each of said engaging means being eccentrically supported by said pin means, in spaced relation to said drive element, for rotation about said pin means, whereby each of said engaging means can be rotated into a position of engagement with said third portion engagement surface; and centrifugal means, connected to each of said engaging means and supported for movement radially outwardly relative to said shaft in response to the rotational speed of said drive element, for rotating said engaging means about said pin means into said position of engagement when said rotational speed of said drive element exceeds a predetermined value;
whereby when said predetermined speed is attained, and said engaging means is rotated into said position of engagement, said drive element is effectively connected with said third portion, and the frictional engagement of said third portion with said clamping means causes reduction of rotation of said drive element.
5. The combination of Claim 4, wherein:
each of said engaging means includes connection points located on diametrically opposite sides of said pin means; and said centrifugal means comprise at least two weights, each of said weights being connected to said engaging means at said connection points;
whereby when said predetermined speed is attained, said weights are caused to be moved in diametrically opposite directions thereby effecting rotation of said engaging means about said pin means into said position of engagement with said third portion engagement surface.
each of said engaging means includes connection points located on diametrically opposite sides of said pin means; and said centrifugal means comprise at least two weights, each of said weights being connected to said engaging means at said connection points;
whereby when said predetermined speed is attained, said weights are caused to be moved in diametrically opposite directions thereby effecting rotation of said engaging means about said pin means into said position of engagement with said third portion engagement surface.
6. The combination of Claim 5, and further comprising means for supplying power to the elevator, and means for selectively interrupting the supply of power, said interrupting means being located proximal to the regulating apparatus, wherein said centrifugal means further comprises peripheral cam portions for engagement with said interrupting means to cut off the power to the elevator when a second predetermined rotational speed of said drive element, less than said first predetermined speed, is attained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000508418A CA1236777A (en) | 1986-05-05 | 1986-05-05 | Lift speed limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000508418A CA1236777A (en) | 1986-05-05 | 1986-05-05 | Lift speed limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1236777A true CA1236777A (en) | 1988-05-17 |
Family
ID=4133062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000508418A Expired CA1236777A (en) | 1986-05-05 | 1986-05-05 | Lift speed limiter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1236777A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105565104A (en) * | 2015-12-22 | 2016-05-11 | 杭州康特尔电梯部件有限公司 | Elevator speed limiter |
-
1986
- 1986-05-05 CA CA000508418A patent/CA1236777A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105565104A (en) * | 2015-12-22 | 2016-05-11 | 杭州康特尔电梯部件有限公司 | Elevator speed limiter |
| CN105565104B (en) * | 2015-12-22 | 2019-07-23 | 杭州康特尔电梯部件有限公司 | Elevator governor |
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