EP0338613A2 - A catch apparatus for a rack lift - Google Patents
A catch apparatus for a rack lift Download PDFInfo
- Publication number
- EP0338613A2 EP0338613A2 EP89200894A EP89200894A EP0338613A2 EP 0338613 A2 EP0338613 A2 EP 0338613A2 EP 89200894 A EP89200894 A EP 89200894A EP 89200894 A EP89200894 A EP 89200894A EP 0338613 A2 EP0338613 A2 EP 0338613A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- engagement
- blocking member
- abutment
- blocking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
- B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
Definitions
- the present invention relates to a catch apparatus for a rack lift, with a tooth wheel engaging the rack and unrotatably mounted on a shaft, which also carries two friction members, which are spring tensioned towards each other for mutual frictional engagement, and of which on is unrotatably carried by the shaft, and the other one is glidingly supported on the shaft but normally co-rotating through the frictional engagement, an inertia blocking mechanism, being arranged to stop the other friction member at exceeding of a limit velocity of the shaft, for thereby braking the shaft through the frictional engagement.
- the object of the invention is to effect a safer and more reliable braking of the lift than has hitherto-been-possible with such an apparatus.
- the blocking mechanism includes a blocking member which is suspended for pendulum movement in a plane extending transversely to the shaft in order to be clamped, when the limit velocity is exceeded, between a fixed abutment and an abutment carried by the other friction member.
- FIG. 1 partly in section shows a catch apparatus according to the invention in the direction of arrows I-I in Fig. 2, and Fig. 2 illustrates the catch apparatus in the direction of arrows 11-11 in Fig. 1.
- the catch apparatus has a tooth wheel 4 in engagement with the rack, not shown, and non-rotatably connected to a shaft 4.
- the shaft 4 is journalled at 6 in a base plate 8 which is fixedly connected to the lift cage and intended to be vertically mounted.
- a yoke 10 is mounted in the same horizontal plane as the shaft 4.
- the yoke 10 has a central opening for the shaft 4 and elements connected thereto, which will be described more closely below.
- the yoke 8 carries a casing 12 for the catch apparatus. More particularly the casing 12 is attached to the yoke 8 by means of screwed joints 14.
- the shaft 4 non-rotatably carries a wheel 16 with a conically extending peripheral surface.
- the wheel 16 is recessed in a bowl 18 normally rotating with the shaft 4.
- the bowl 18 has a conical inner wall mating with the conical periphery of the wheel 16. Between the conical surfaces of the wheel 16 and the bowl 18 a friction lining is arranged.
- the bowl 18 is seated on the shaft 4 via a slide bearing 20.
- Above the bowl 18 the shaft 4 carries a sleeve 22 which is journalled in the opening of the yoke 8 by means of bearings 24. Below the yoke 10 the sleeve 22 is widening into a cup shaped housing 26 for a disc spring package 28.
- the sleeve 22 is kept in place on the end of the shaft 4 by means of an end plate 30, which is attached to the shaft 4 by means of four screws 32. More particularly, a shoulder 34 of the plate 30 presses against the end of the sleeve 22 via a washer 36.
- the bowl 18 has two externally profiled shoulders 38 and 40.
- the shoulder 38 has a hexagonal shape, as appears from the plane view in Fig. 2.
- the shoulder 40 has a saw tooth shaped profile with six teeth, as likewise appears from the plane view of Fig. 2. In the manner shown each of the teeth are arranged in front of its respective one of the plane sides of the hexagonal shoulder 38. Each tooth has furthermore a tooth shoulder 42 facing in the rotational direction.
- An oval pendulum member 42 is pivotally suspended at one of its ends on a bolt 46 fixedly connected to the plate 8.
- the bolt 46 is not visible in Fig. 1.
- the oval pendulum member 44 in front of each leg of the yoke 8 has a projecting abutment 48 and 50, respectively.
- the abutment 48 has such a length that the longitudinal axis of the pendulum menber 44 extends essentially perpendicularly to the plane of the yoke 8 when the abutment 48 engages the adjacent leg of the yoke 8.
- the abutment 50 is shorter than the abutment 48 and carries a pressure spring 52 which is tensioned between the side of the pendulum member 44 and the adjacent leg of the yoke 8.
- the pendulum 44 pivotally carries a crescent shaped blocking member 54.
- the blocking member 54 is not visible in Fig. 1, but is carried behind the pendulum 44 so that it is located in the plane of the tooth profile 40.
- the blocking member 54 has a hook end 56 shaped for engagement with the tooth shoulder 42 and an opposite end 58.
- the blocking member 54 On its inside facing away from the pendulum 44, in the vicinity of the end 58, the blocking member 54 carries a roller 60 in the same plane as the hexagonal profile 38.
- the roller 60 is resiliently pressed into light engagement with the circumference of the hexagonal profile 38 by means of a draw spring 62 acting between the pendelum 44 and the blocking member 54.
- the tension of the draw spring 62 is settable by means of a screw- and nut arrangement 64.
- the plate 8 carries a switch 66 connected in the drive circuit of the lift and having an operating element 68 which breaks the drive circuit at actuation by a shoulder 70 located on the blocking member 54, in a way to be described more closely below.
- a plate 72 with a V-shaped cut 74 is located in front of the adjacent end 58 of the blocking member 54, said end 58 having a pointed shape complementary to the cut 74.
- the described catch apparatus operates as follows:
- the above-mentioned limit velocity at which the catch device shall start work is determined by the tension of the spring 62.
- the braking time at first hand is decided by the spring force of the spring package 28 by means of which the bowl 18 is pressed against the wheel 16.
- the invention at first hand consists in the rocking suspension of the blocking member 54 by means of the pendelum 44, which at catching makes possible controlled introduction into the cut 74 and thereby an always fixed locking position for the blocking member 54. As a result also a safe operation of the switch is always obtained.
- the mentioned advantages have not been obtained in prior apparatus of similar kind where the catch element is fixedly mounted.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Automatic Cycles, And Cycles In General (AREA)
- Warehouses Or Storage Devices (AREA)
- Transmission Devices (AREA)
Abstract
Description
- The present invention relates to a catch apparatus for a rack lift, with a tooth wheel engaging the rack and unrotatably mounted on a shaft, which also carries two friction members, which are spring tensioned towards each other for mutual frictional engagement, and of which on is unrotatably carried by the shaft, and the other one is glidingly supported on the shaft but normally co-rotating through the frictional engagement, an inertia blocking mechanism, being arranged to stop the other friction member at exceeding of a limit velocity of the shaft, for thereby braking the shaft through the frictional engagement.
- The object of the invention is to effect a safer and more reliable braking of the lift than has hitherto-been-possible with such an apparatus.
- This object has been attained in that the blocking mechanism includes a blocking member which is suspended for pendulum movement in a plane extending transversely to the shaft in order to be clamped, when the limit velocity is exceeded, between a fixed abutment and an abutment carried by the other friction member.
- On the drawings Fig. 1 partly in section shows a catch apparatus according to the invention in the direction of arrows I-I in Fig. 2, and Fig. 2 illustrates the catch apparatus in the direction of arrows 11-11 in Fig. 1.
- The catch apparatus has a
tooth wheel 4 in engagement with the rack, not shown, and non-rotatably connected to ashaft 4. Theshaft 4 is journalled at 6 in a base plate 8 which is fixedly connected to the lift cage and intended to be vertically mounted. On the base plate 8 ayoke 10 is mounted in the same horizontal plane as theshaft 4. Theyoke 10 has a central opening for theshaft 4 and elements connected thereto, which will be described more closely below. Furthermore, the yoke 8 carries a casing 12 for the catch apparatus. More particularly the casing 12 is attached to the yoke 8 by means ofscrewed joints 14. - Behind the plate 8 the
shaft 4 non-rotatably carries awheel 16 with a conically extending peripheral surface. Thewheel 16 is recessed in abowl 18 normally rotating with theshaft 4. Thebowl 18 has a conical inner wall mating with the conical periphery of thewheel 16. Between the conical surfaces of thewheel 16 and the bowl 18 a friction lining is arranged. Thebowl 18 is seated on theshaft 4 via a slide bearing 20. Above thebowl 18 theshaft 4 carries a sleeve 22 which is journalled in the opening of the yoke 8 by means of bearings 24. Below theyoke 10 the sleeve 22 is widening into a cup shapedhousing 26 for adisc spring package 28. The sleeve 22 is kept in place on the end of theshaft 4 by means of anend plate 30, which is attached to theshaft 4 by means of fourscrews 32. More particularly, ashoulder 34 of theplate 30 presses against the end of the sleeve 22 via awasher 36. - By means of the disc spring package 28 a pressure is exercized against the
bowl 18 so that the later thus presses against thewheel 16 and thereby also the conical surfaces press against each other via the friction lining. - The
bowl 18 has two externally profiledshoulders shoulder 38 has a hexagonal shape, as appears from the plane view in Fig. 2. Theshoulder 40 has a saw tooth shaped profile with six teeth, as likewise appears from the plane view of Fig. 2. In the manner shown each of the teeth are arranged in front of its respective one of the plane sides of thehexagonal shoulder 38. Each tooth has furthermore atooth shoulder 42 facing in the rotational direction. - An
oval pendulum member 42 is pivotally suspended at one of its ends on abolt 46 fixedly connected to the plate 8. Thebolt 46 is not visible in Fig. 1. Theoval pendulum member 44 in front of each leg of the yoke 8 has a projectingabutment abutment 48 has such a length that the longitudinal axis of thependulum menber 44 extends essentially perpendicularly to the plane of the yoke 8 when theabutment 48 engages the adjacent leg of the yoke 8. Theabutment 50 is shorter than theabutment 48 and carries apressure spring 52 which is tensioned between the side of thependulum member 44 and the adjacent leg of the yoke 8. By this resilient clamping of thependulum 44 between the legs of the yoke 8 not desirable shaking movements of the pendulum are restricted when the lift is operated. - At its lower end the
pendulum 44 pivotally carries a crescent shapedblocking member 54. The blockingmember 54 is not visible in Fig. 1, but is carried behind thependulum 44 so that it is located in the plane of thetooth profile 40. The blockingmember 54 has ahook end 56 shaped for engagement with thetooth shoulder 42 and anopposite end 58. On its inside facing away from thependulum 44, in the vicinity of theend 58, the blockingmember 54 carries a roller 60 in the same plane as thehexagonal profile 38. The roller 60 is resiliently pressed into light engagement with the circumference of thehexagonal profile 38 by means of adraw spring 62 acting between thependelum 44 and the blockingmember 54. The tension of thedraw spring 62 is settable by means of a screw- andnut arrangement 64. - The plate 8 carries a
switch 66 connected in the drive circuit of the lift and having an operating element 68 which breaks the drive circuit at actuation by ashoulder 70 located on the blockingmember 54, in a way to be described more closely below. - In the same plane as the blocking
member 54, in association with theswitch 66, aplate 72 with a V-shaped cut 74 is located in front of theadjacent end 58 of the blockingmember 54, saidend 58 having a pointed shape complementary to the cut 74. - The described catch apparatus operates as follows:
- In normal operation all the elements carried by the
shaft 4 and described above rotate together with thetooth wheel 2 and theshaft 4 in clockwise direction in Fig. 2. The roller 60 on the blockingmember 54 follows thehexagonal contour 38. When the roller 60 passes the corners of the hexagonal, thehook end 56 of the blockingmember 54 is pressed against the action of thespring 62 into the path of movement of thesaw tooth contour 40, but when the roller leaves the corner and runs out on the plane side of thehexagonal profile 38 thehook end 56 of the blockingmember 54 is lifted by thespring 62 just enough out of the path of movement of thesaw tooth profile 40 before thehook end 56 of the blockingmember 54 has time to be hit by theabutment 42 of an adjacent tooth of thesaw tooth profile 40. - At increasing rotational velocity of the
shaft 4 the inertia of the blockingmember 54 results in the roller 60 getting a tendency of not having time to follow the flat side of thehexagonal profile 38. At a determined limit velocity this finally brings about that thehook end 56 of the blockingmember 54 does not have time to be lifted out of the path of movement of thesaw tooth profile 40 but is hit by theabutment 42 of an adjacent tooth. This immediately brings about that thependulum 44 by the engagement of thesaw tooth profile 40 is swung to the left in Fig. 2 so that theend 58 of the blockingmember 54 enters the cut 74. A distinct locking of the blockingmember 54 between the cut 74 and thetooth abutment 42 is thereby attained and thebowl 18 is brought to immediate stop on theshaft 4. This brings about braking of theshaft 4 through the friction engagement between the conical surfaces of thebowl 18 and thewheel 16 so that a soft braking of theshaft 4 is attained. - At the movement of the blocking
member 54 into the cut 74 also the operating element 68 of theswitch 66 is operated by means of theabutment 70 located on the blockingmember 54, so that the drive circuit of the lift is broken. - The above-mentioned limit velocity at which the catch device shall start work is determined by the tension of the
spring 62. - The braking time at first hand is decided by the spring force of the
spring package 28 by means of which thebowl 18 is pressed against thewheel 16. - The invention at first hand consists in the rocking suspension of the blocking
member 54 by means of thependelum 44, which at catching makes possible controlled introduction into the cut 74 and thereby an always fixed locking position for the blockingmember 54. As a result also a safe operation of the switch is always obtained. The mentioned advantages have not been obtained in prior apparatus of similar kind where the catch element is fixedly mounted.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8801506A SE468089B (en) | 1988-04-22 | 1988-04-22 | DEVICE FOR SEARCH LIFT |
SE8801506 | 1988-04-22 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0338613A2 true EP0338613A2 (en) | 1989-10-25 |
EP0338613A3 EP0338613A3 (en) | 1990-07-25 |
EP0338613B1 EP0338613B1 (en) | 1993-09-01 |
Family
ID=20372098
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89200894A Expired - Lifetime EP0338613B1 (en) | 1988-04-22 | 1989-04-10 | A catch apparatus for a rack lift |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0338613B1 (en) |
AU (1) | AU609600B2 (en) |
DE (1) | DE68908758T2 (en) |
DK (1) | DK193889A (en) |
FI (1) | FI90755C (en) |
NO (1) | NO172227C (en) |
SE (1) | SE468089B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0385180A2 (en) * | 1989-03-02 | 1990-09-05 | Maber costruzioni s.r.l. | Safety brake for a lift or the like |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1506473B1 (en) * | 1966-05-06 | 1971-01-28 | Alimak Verken Aktiebolaget | Safety catch for construction and similar elevators |
FR2422586A1 (en) * | 1978-01-21 | 1979-11-09 | Thyssen Aufzuege Gmbh | Lift speed limitation mechanism - has device holding roller mounting in locking position independently when speed limit is reached |
EP0279144A2 (en) * | 1986-12-23 | 1988-08-24 | MANNESMANN Aktiengesellschaft | Safety brake |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU406223B2 (en) * | 1967-09-29 | 1970-09-21 | T. W. Crommelin & Co. Pty. Ltd | Improved safety device for elevators |
-
1988
- 1988-04-22 SE SE8801506A patent/SE468089B/en not_active IP Right Cessation
-
1989
- 1989-04-10 EP EP89200894A patent/EP0338613B1/en not_active Expired - Lifetime
- 1989-04-10 DE DE1989608758 patent/DE68908758T2/en not_active Expired - Fee Related
- 1989-04-20 DK DK193889A patent/DK193889A/en not_active Application Discontinuation
- 1989-04-21 NO NO891649A patent/NO172227C/en unknown
- 1989-04-21 FI FI891925A patent/FI90755C/en not_active IP Right Cessation
- 1989-04-21 AU AU33264/89A patent/AU609600B2/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1506473B1 (en) * | 1966-05-06 | 1971-01-28 | Alimak Verken Aktiebolaget | Safety catch for construction and similar elevators |
FR2422586A1 (en) * | 1978-01-21 | 1979-11-09 | Thyssen Aufzuege Gmbh | Lift speed limitation mechanism - has device holding roller mounting in locking position independently when speed limit is reached |
EP0279144A2 (en) * | 1986-12-23 | 1988-08-24 | MANNESMANN Aktiengesellschaft | Safety brake |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0385180A2 (en) * | 1989-03-02 | 1990-09-05 | Maber costruzioni s.r.l. | Safety brake for a lift or the like |
EP0385180A3 (en) * | 1989-03-02 | 1992-05-20 | Maber costruzioni s.r.l. | Safety brake for a lift or the like |
Also Published As
Publication number | Publication date |
---|---|
SE8801506D0 (en) | 1988-04-22 |
SE8801506L (en) | 1989-10-23 |
NO172227C (en) | 1993-06-23 |
AU3326489A (en) | 1989-10-26 |
FI891925A (en) | 1989-10-23 |
EP0338613A3 (en) | 1990-07-25 |
AU609600B2 (en) | 1991-05-02 |
FI90755B (en) | 1993-12-15 |
DE68908758T2 (en) | 1994-03-24 |
DK193889D0 (en) | 1989-04-20 |
FI891925A0 (en) | 1989-04-21 |
NO891649D0 (en) | 1989-04-21 |
SE468089B (en) | 1992-11-02 |
NO891649L (en) | 1989-10-23 |
DE68908758D1 (en) | 1993-10-07 |
FI90755C (en) | 1994-03-25 |
NO172227B (en) | 1993-03-15 |
DK193889A (en) | 1989-10-23 |
EP0338613B1 (en) | 1993-09-01 |
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