EP0245686B1 - Braking device for lifting means, such as lifts or goods lifts - Google Patents
Braking device for lifting means, such as lifts or goods lifts Download PDFInfo
- Publication number
- EP0245686B1 EP0245686B1 EP87106088A EP87106088A EP0245686B1 EP 0245686 B1 EP0245686 B1 EP 0245686B1 EP 87106088 A EP87106088 A EP 87106088A EP 87106088 A EP87106088 A EP 87106088A EP 0245686 B1 EP0245686 B1 EP 0245686B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- braking
- braking device
- lifts
- jaws
- alternate current
- 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
Links
- 230000000694 effects Effects 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
Abstract
Description
- The present invention refers to a braking device for lifting means, such as lifts or goods lifts.
- More in particular, the present invention refers to a braking device for lifting means, such as lifts or goods lifts normally used in blocks of flats of co-ownership, buildings assigned to dwelling-houses and/or offices and similar.
- A braking device comprising two coupled braking systems is disclosed in DE-C-1007041.
- US-A-4232768 discloses an improved brake for winches comprising a first main brake, a second emergency brake, first means for actuating the first brake, second means for actuating the second brake in emergency and means for delaying operation of the second means relating to the first means to apply first and second braking force in sequence in an emergency.
- An electromagnetic brake is described in DE-A-3003148.
- Jaw brakes are well known and generally used in the lifting means.
- These types of brakes, while corresponding to all safety guarantees, is not very precise in the sense that the stop of the elevator cars at the floors takes place with a certain approximation, leaving visible differences in level between the openings of the cars and those of the floors.
- This is due to the fact that the intervention and action of the jaw brakes, at each stop request, are not always constant and therefore the stop of the cars takes place slightly before or after the times foreseen, so that the floor of the cars is never perfectly aligned with the floor of the stop levels.
- Due to this imperfect operation, it very often happens that, during entry or exit of the lifts, with the floor not level with respect to that of the stop levels, users trip, injuring themselves.
- Another problem is due to the fact that lifts equipped with jaw brakes, even if cheaper to build than other braking means, like, for example, two-speed direct current motors or two-pole motors, are subject to frequent maintenance, to keep the imperfect stopping position of the cars within restricted limits and check the wear state of the braking jaws.
- To overcome these problems various solutions have been proposed; in particular, tests have been made provoking braking by inserting direct current in the asynchronous alternate current lifting motors. However, since the braking effect depends on the square of the speed of the motor, its efficiency rapidly decreased, becoming practically nil the moment the lifts had effectively to stop.
- Other attempts were made using intermittent braking means acting on the standard jaws, but results were not positive as there was no improvement in either the precision of the stopping of the lifts or the wear on the jaws.
- The object of the present invention is to eliminate the abovementioned problems.
- According to the present invention,
this object is achieved by the features in the characterizing part of claim 1. - Particular embodiments of the invention are set forth in
dependent claims 2 to 3. - Particularly, the subject matter of the present invention is a lift comprising an asynchronous alternate current motor, an electromagnetic braking device, provided with braking jaws, a manoeuvring winch comprising a traction pulley of cables supporting an elevator car, at one end, and a counterweight, at the other end, and means for controlling the braking device, characterized in that the means for controlling the braking device consists in supplying the asynchronous alternate current motor with direct current and, simultaneously, the electromagnetic braking device with sequential pulses intermittently acting on the jaws.
- The asynchronous alternate current motor, with one speed, supplied with direct currents is the first braking system.
- The electromagnetic braking device with intermittent action on the jaws is the second braking system.
- The first braking system exercises a braking action at the first stage, which then decreases according to the square of the speed, and the second braking system acts intermittently and with variable braking force.
- The braking device of the present invention permits us to obtain, in first place, a more regular, precise braking effect since the two coupled braking systems, with simultaneous action, intervene on both the traction motor and on the braking jaws of traditional type. Moreover, the braking action exercised on the motor is of continuous type, while that exercised on the jaws is of intermittent type or with variable force. Through the use of the braking device of the present invention, the following advantages are obtained:
- the double simultaneous braking action consents a better regulation of the system and the stop of the elevator cars takes place in the required time and space;
- the jaws of the traditional braking system are subject to less wear, permitting advantageous savings on spare parts and maintenance;
- the double coupled braking system gives greater safety guarantees to the lifting means.
- The constructive and operative characteristics or the braking device for lifting means, such as lifts or goods lifts, of the present invention will be easier to understand from the following detailed description, in which reference is made to the attached figure 1, which shows a schematic view of the cross-section of a lifting plant equipped with the braking device of the present invention in a form of construction given by way of illustration and example, but not binding.
- With reference to the figure, the braking device for lifting means, like lifts or goods lifts, of the present invention, comprises essentially an asynchronous alternate current motor 1, with one speed, connected to the
manoeuvring winch 2 by anelectromagnetic brake 3. - The
manoeuvring winch 2 comprises thetraction pulley 4 of thecables 5, which support, at one end, elevator car 6 and, at the other end, is suspended thecounterweight 7. - In operation, when a stop is booked from elevator car 6 or from any
floor 8, by means of the traditional push-button strips 9 or 9', selector switch 10 presets and automatically intervenes to supply the various parts with the controls necessary to make the manoeuvre. - In particular, said controls are sent to the braking device sufficiently in advance to guarantee the slowing down and stopping of car 6 exactly in front of
space 11, corresponding to the door of eachfloor 8, so that the level 12 of its floor is perfectly aligned with that or thelevels 13. - According to the device of the present invention, the braking control is sent simultaneously to the asynchronous alternate current motor 1 and the
electromagnetic brake 3. - The braking action on the asynchronous alternate current motor 1 is obtained by inserting direct current in it, while sequential pulses are sent to the
electromagnetic brake 3 which cause its intervention intermittently or with variable force. - The coupling of the two braking systems acting simultaneously permits us to obtain a perfectly controlled stop of the elevator cars 6, to such a point that it is possible to determine with extreme precision the total time of braking, slowing down and stopping, So that it is possible to regulate with precision alignment of the
abovementioned levels 12 and 13. - This is possible thanks to the different behaviours of the two braking systems: the effect produced by insertion of direct current in the asynchronous alternate current motor 1 causes, as noted, a considerable braking action the first instant, which then drops according to the square of the speed of the motor rotor while slowing down; the simultaneous intermittent action of intervention, exercised simultaneously on
brake 3, assists the first action, so that its braking effect, added to the first, permits us to obtain a substantially constant total braking, independent from load and other factors. - The intermittent braking action on
brake 3 is therefore directed at regulation of the stop run, especially in the final phase, since the real braking action is carried out very efficiently by motor 1 in the first phase, as soon as the direct current is inserted in it. - The two braking systems acting simultaneously therefore exercise actions of mutual compensation, giving as final result a constant, regular braking, independent from load. Moreover, thanks to the vigorous initial effect of the braking produced by motor 1, the subsequent intermittent braking interventions with the jaws of
brake 3 are more moderate, with the advantage of less wear on said brake.
Claims (3)
- A lift comprising an asynchronous alternate current motor (1), an electromagnetic braking device (3), provided with braking jaws, a manoeuvring winch (2) comprising a traction pulley (4) of cables (5) supporting an elevator car (6), at one end, and a counterweight (7), at the other end, and means for controlling the braking device, characterized in that the means for controlling the braking device consists in supplying the asynchronous alternate current motor (1) with direct current and, simultaneously, the electromagnetic braking device (3) with sequential pulses intermittently acting on the jaws.
- The lift according to claim 1, characterized in that the asynchronous alternate current motor (1) is connected to the manoeuvring winch (2) by the electromagnetic braking device (3).
- The lift according to claim 1 or 2, characterized in that the braking power of the jaws of the electromagnetic braking device (3) is intermittent and with variable force.-
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87106088T ATE97103T1 (en) | 1986-05-07 | 1987-04-27 | BRAKING DEVICE FOR LIFTING EQUIPMENT LIKE PERSONS OR LIFTS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8621748U IT208095Z2 (en) | 1986-05-07 | 1986-05-07 | BRAKING DEVICE FOR LIFTING VEHICLES, SUCH AS LIFTS AND LIFTS. |
IT2174886U | 1986-05-07 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0245686A2 EP0245686A2 (en) | 1987-11-19 |
EP0245686A3 EP0245686A3 (en) | 1990-05-23 |
EP0245686B1 true EP0245686B1 (en) | 1993-11-10 |
Family
ID=11186302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87106088A Expired - Lifetime EP0245686B1 (en) | 1986-05-07 | 1987-04-27 | Braking device for lifting means, such as lifts or goods lifts |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0245686B1 (en) |
AT (1) | ATE97103T1 (en) |
DE (1) | DE3788081T2 (en) |
ES (1) | ES2047481T3 (en) |
IT (1) | IT208095Z2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9457987B2 (en) | 2011-02-04 | 2016-10-04 | Otis Elevator Company | Stop sequencing for braking device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04129988A (en) * | 1990-09-19 | 1992-04-30 | Toshiba Corp | Elevator |
FI109684B (en) * | 1998-03-23 | 2002-09-30 | Kone Corp | A method of braking a traction sheave and a traction sheave |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4232768A (en) * | 1978-05-01 | 1980-11-11 | Jacques Dufresne | Automatic emergency brake |
GB2040857A (en) * | 1979-02-07 | 1980-09-03 | Columbus Mckinnon Corp | Hoist load positioner |
-
1986
- 1986-05-07 IT IT8621748U patent/IT208095Z2/en active
-
1987
- 1987-04-27 EP EP87106088A patent/EP0245686B1/en not_active Expired - Lifetime
- 1987-04-27 AT AT87106088T patent/ATE97103T1/en not_active IP Right Cessation
- 1987-04-27 DE DE87106088T patent/DE3788081T2/en not_active Expired - Fee Related
- 1987-04-27 ES ES87106088T patent/ES2047481T3/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9457987B2 (en) | 2011-02-04 | 2016-10-04 | Otis Elevator Company | Stop sequencing for braking device |
Also Published As
Publication number | Publication date |
---|---|
DE3788081T2 (en) | 1994-03-17 |
EP0245686A2 (en) | 1987-11-19 |
DE3788081D1 (en) | 1993-12-16 |
ES2047481T3 (en) | 1994-03-01 |
EP0245686A3 (en) | 1990-05-23 |
IT208095Z2 (en) | 1988-03-31 |
ATE97103T1 (en) | 1993-11-15 |
IT8621748V0 (en) | 1986-05-07 |
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