CN115072521B - Safety braking device for elevator - Google Patents
Safety braking device for elevator Download PDFInfo
- Publication number
- CN115072521B CN115072521B CN202210821842.8A CN202210821842A CN115072521B CN 115072521 B CN115072521 B CN 115072521B CN 202210821842 A CN202210821842 A CN 202210821842A CN 115072521 B CN115072521 B CN 115072521B
- Authority
- CN
- China
- Prior art keywords
- magnet
- fixedly connected
- car
- rotating wheel
- rod
- 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.)
- Active
Links
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 12
- NDEMNVPZDAFUKN-UHFFFAOYSA-N guanidine;nitric acid Chemical compound NC(N)=N.O[N+]([O-])=O.O[N+]([O-])=O NDEMNVPZDAFUKN-UHFFFAOYSA-N 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000006698 induction Effects 0.000 abstract description 4
- 230000001960 triggered effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- B66B5/24—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 by acting on guide ropes or cables
-
- 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
- B66B5/185—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 by acting on main ropes or main cables
-
- 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
- B66B5/28—Buffer-stops for cars, cages, or skips
- B66B5/282—Structure thereof
-
- 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
- B66B5/28—Buffer-stops for cars, cages, or skips
- B66B5/284—Buffer-stops for cars, cages, or skips mounted on cars or counterweights
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a safety braking device for an elevator, which particularly relates to the field of elevator protection, and comprises an elevator car and rails, wherein the elevator car is positioned between the two rails, an electromagnetic induction mechanism is arranged in the rails, a braking mechanism and an anti-collision protection mechanism are arranged on the elevator car, the electromagnetic induction mechanism comprises a magnet I, a magnet II, a rotating wheel, a cutting ring and a conductive assembly, a vertical rod is fixedly connected in the rails, the magnet I and the magnet II are fixedly connected to the vertical rod respectively, a rotating wheel is arranged between the magnet I and the magnet II, the rotating wheel is in rotary connection with the rails, a cutting ring is fixedly connected to the rotating wheel, the cutting ring is connected with the braking mechanism through the conductive assembly, when the elevator car suddenly descends, the rotating speed of the rotating wheel becomes fast, and the rotating wheel drives the cutting ring to make the current quantity generated when the cutting ring makes the cutting magnetic induction line in the magnet I and the magnet II to move, so that the braking mechanism can be triggered to operate.
Description
Technical Field
The invention relates to the field of elevator protection, in particular to a safety braking device for an elevator.
Background
The prior devices for safety braking in elevators have a heavy locking measure, and when the heavy locking measure fails, the elevator cannot be stopped by other braking elements, so that the braking reliability of the prior safety braking device is not high enough.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a safety braking device for an elevator, which aims to solve the technical problems that: the prior devices for safety braking in elevators have a heavy locking measure, and when the heavy locking measure fails, the elevator cannot be stopped by other braking elements, so that the braking reliability of the prior safety braking device is not high enough.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a safety brake device for elevator, includes car and track, the car is located between two tracks, install electromagnetic induction mechanism in the track, install brake mechanism and anticollision protection mechanism on the car, electromagnetic induction mechanism includes first magnet, second magnet, runner, cutting ring and conductive component, fixedly connected with pole setting in the track, respectively fixedly connected with first magnet and second magnet in the pole setting, be provided with the runner between first magnet and the second magnet, runner and track rotation are connected, fixedly connected with cutting ring on the runner, the cutting ring is connected through conductive component and brake mechanism.
Preferably, the conductive assembly comprises an electromagnetic block, a wrapping sleeve, a conductive block, a first conductive wire body and a second conductive wire body, the wrapping sleeve is wound on the rotating wheel, the cutting ring is connected with the conductive block through the wrapping sleeve, the first conductive wire body and the second conductive wire body are wrapped in the wrapping sleeve, two ends of the cutting ring are respectively electrically connected with the conductive block through the first conductive wire body and the second conductive wire body, the conductive block is electrically connected with the electromagnetic block, and the conductive block slides in the vertical rod.
Preferably, the braking mechanism comprises a magnet, a fixed ring, a sliding rod, a connecting rod, a rotary convex gear, a rack and a clamping head, wherein the magnet is arranged below the electromagnetic block, the magnet is in sliding connection with the mounting plate, the mounting plate is fixedly connected with the car, the magnet is fixedly connected with the sliding rod, the sliding rod is arranged in the fixed ring in a penetrating manner, the fixed ring is fixedly connected with the mounting plate, the magnet is elastically connected with the fixed ring, the connecting rod is respectively and rotatably connected with two sides of the sliding rod, the sliding rod is eccentrically and rotatably connected with the corresponding rotary convex gear through the connecting rod, the rotary convex gear is rotatably connected with the mounting plate, the rack in sliding connection with the car is arranged below the rotary convex gear, the rotary convex gear is in meshed transmission with the rack, and the clamping head is elastically connected with the rack.
Preferably, the anti-collision protection mechanism comprises a shell, a driven rod, an air bag, a battery, an igniter, a first conductive sheet and a second conductive sheet, wherein the rack is fixedly connected with the driven rod, the igniter is installed on the driven rod, the battery is installed on the shell, the shell is fixedly connected on a car, the first conductive sheet is fixedly connected on the igniter, the second conductive sheet is fixedly connected on the battery, the igniter is positioned in the air bag, the driven rod is elastically connected with the shell, a sealing box is filled in the air bag, the igniter is positioned in the sealing box, compressed liquid gas is filled in the sealing box, a bottom plate is fixedly connected with the bottom of the car, and a yielding port for expanding the air bag is installed in the bottom plate and is formed in the bottom plate.
Preferably, the gas is guanidine nitrate gas.
The invention has the technical effects and advantages that: in this device, when the car is in normal decline state, conductive component drives the runner and is in low-speed rotation state, and brake mechanism is not triggered, and when the car suddenly descends, the rotational speed of runner becomes fast, and the runner drives the cutting ring and does the electric current volume that produces when cutting the motion of magnetic induction line in magnet one and magnet two and become to can trigger brake mechanism operation.
Drawings
Fig. 1 is a schematic structural view of a safety brake device for an elevator according to the present invention.
Fig. 2 is a schematic structural view of the rotating wheel of the present invention.
Fig. 3 is a schematic structural view of a first conductive wire body according to the present invention.
Fig. 4 is a schematic structural view of a rotary cam gear according to the present invention.
Fig. 5 is a schematic view of the structure of the igniter of the invention.
The reference numerals are:
1. a car; 2. a track; 3. an electromagnetic block; 4. a mounting plate; 5. a bottom plate; 6. a first magnet; 7. a second magnet; 8. a rotating wheel; 9. a cutting ring; 10. a wrapping sleeve; 11. a conductive block; 12. a vertical rod; 13. a first wire body; 14. a second wire body; 15. a magnet; 16. a fixing ring; 17. a slide bar; 18. a connecting rod; 19. rotating the convex gear; 20. a rack; 21. a clamping head; 22. a housing; 23. a driven rod; 24. an air bag; 25. a battery; 26. an igniter; 27. a first conductive sheet; 28. a second conductive sheet; 29. and sealing the box.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1-5, a safety braking device for an elevator comprises a car 1 and a track 2, wherein the car 1 is positioned between the two tracks 2, an electromagnetic induction mechanism is installed in the track 2, a braking mechanism and an anti-collision protection mechanism are installed on the car 1, the electromagnetic induction mechanism comprises a first magnet 6, a second magnet 7, a rotating wheel 8, a cutting ring 9 and a conductive component, a vertical rod 12 is fixedly connected in the track 2, the first magnet 6 and the second magnet 7 are respectively and fixedly connected on the vertical rod 12, a rotating wheel 8 is arranged between the first magnet 6 and the second magnet 7, the rotating wheel 8 is rotationally connected with the track 2, a cutting ring 9 is fixedly connected on the rotating wheel 8, and the cutting ring 9 is connected with the braking mechanism through the conductive component. In this device, when car 1 is in normal decline state, conductive component drives runner 8 and is in low-speed rotation state, and brake mechanism is not triggered, and when car 1 suddenly descends, the rotational speed of runner 8 becomes fast, and the current volume that produces when runner 8 drove cutting ring 9 and is doing the motion of cutting magnetic induction line in magnet one 6 and magnet two 7 becomes great to can trigger brake mechanism operation, specifically, the user can select the magnetism size of magnet one 6 and magnet two 7 according to the sudden speed of falling of car 1 who presets.
The electric conduction assembly comprises an electromagnetic block 3, a wrapping sleeve 10, an electric conduction block 11, a first lead body 13 and a second lead body 14, wherein the wrapping sleeve 10 is wound on a rotating wheel 8, a cutting ring 9 is connected with the electric conduction block 11 through the wrapping sleeve 10, the first lead body 13 and the second lead body 14 are wrapped in the wrapping sleeve 10, two ends of the cutting ring 9 are respectively electrically connected with the electric conduction block 11 through the first lead body 13 and the second lead body 14, the electric conduction block 11 is electrically connected with the electromagnetic block 3, and the electric conduction block 11 slides in a vertical rod 12. While the cutting ring 9 rotates, the current generated by the cutting ring 9 cutting the magnetic induction wire between the magnet I6 and the magnet II 7 is transmitted into the conductive block 11 through the first lead body 13 and then forms a closed loop through the second lead body 14, so that the conductive block 11 can continuously transmit the current to the braking mechanism.
Example two
Referring to fig. 1-5, on the basis of the above embodiment, the braking mechanism includes a magnet 15, a fixed ring 16, a sliding rod 17, a connecting rod 18, a rotating cam 19, a rack 20 and a clamping head 21, the magnet 15 is disposed below the electromagnetic block 3, the magnet 15 is slidably connected with the mounting plate 4, the mounting plate 4 is fixedly connected with the car 1, the magnet 15 is fixedly connected with the sliding rod 17, the sliding rod 17 is inserted into the fixed ring 16, the fixed ring 16 is fixedly connected with the mounting plate 4, the magnet 15 is elastically connected with the fixed ring 16, both sides of the sliding rod 17 are rotatably connected with the connecting rod 18, the sliding rod 17 is eccentrically and rotatably connected with the corresponding rotating cam 19 through the connecting rod 18, the rotating cam 19 is rotatably connected with the mounting plate 4, the rack 20 slidably connected with the car 1 is disposed below the rotating cam 19, the rotating cam 19 is in meshed transmission with the rack 20, and the clamping head 21 is elastically connected with the rack 20. After the current is transmitted to the electromagnetic block 3 by the conductive block 11, the electromagnetic block 3 is electrified to generate magnetic force, when the car 1 runs normally, the magnetic force on the electromagnetic block 3 is smaller, the magnet 15 cannot be attracted to apply work against the elastic force, when the car 1 suddenly drops, the magnetic attraction force of the electromagnetic block 3 is larger, the magnet 15 can be attracted to move upwards against the elastic force, the magnet 15 drives the rotary convex gears 19 to rotate in opposite directions through the sliding rod 17 and the connecting rod 18, the rotary convex gears 19 drive the two racks 20 to approach each other through meshing transmission, the racks 20 drive the clamping heads 21 to clamp cables between the clamping heads 21, so that the effect of reducing the suddenly dropping speed of the car 1 is achieved.
The anti-collision protection mechanism comprises a shell 22, a driven rod 23, an air bag 24, a battery 25, an igniter 26, a first conductive sheet 27 and a second conductive sheet 28, wherein the rack 20 is fixedly connected with the driven rod 23, the igniter 26 is installed on the driven rod 23, the battery 25 is installed on the shell 22, the shell 22 is fixedly connected with the car 1, the first conductive sheet 27 is fixedly connected with the igniter 26, the second conductive sheet 28 is fixedly connected with the battery 25, the igniter 26 is located in the air bag 24, the driven rod 23 is elastically connected with the shell 22, a sealing box 29 is filled in the air bag 24, the igniter 26 is located in the sealing box 29, gas compressed into liquid is filled in the sealing box 29, the bottom of the car 1 is fixedly connected with a bottom plate 5, and a yielding port for expanding the air bag 24 is formed in the bottom plate 5. In the continuous moving process of the rack 20, the rack 20 drives the driven rod 23 to pull the igniter 26 to move, when the first conductive sheet 27 and the second conductive sheet 28 on the igniter 26 are attached, current in the battery 25 enters the igniter 26 through a lead to control the igniter 26 to ignite, gas filled in the sealing box 29 is ignited, the gas is quickly gasified and expanded, the sealing box 29 is exploded, the air bag 24 is quickly expanded, and even if the speed of the car 1 is not reduced to a stop, the existence of the air bag 24 can play a certain anti-collision buffering role to a certain extent, so that the safety of the device in use is further improved.
The gas is guanidine nitrate gas. The guanidine nitrate gas does not generate harmful gas when decomposed, and meets the requirement of safe use.
The last points to be described are: first, in the description of the present application, it should be noted that, unless otherwise specified and defined, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be mechanical or electrical, or may be a direct connection between two elements, and "upper," "lower," "left," "right," etc. are merely used to indicate relative positional relationships, which may be changed when the absolute position of the object being described is changed;
secondly: in the drawings of the disclosed embodiments, only the structures related to the embodiments of the present disclosure are referred to, and other structures can refer to the common design, so that the same embodiment and different embodiments of the present disclosure can be combined with each other under the condition of no conflict;
finally: the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. Safety braking device for elevator, including car (1) and track (2), car (1) is located between two track (2), its characterized in that: an electromagnetic induction mechanism is arranged in the track (2), a braking mechanism and an anti-collision protection mechanism are arranged on the car (1), the electromagnetic induction mechanism comprises a first magnet (6), a second magnet (7), a rotating wheel (8), a cutting ring (9) and a conductive component, a vertical rod (12) is fixedly connected in the track (2), the first magnet (6) and the second magnet (7) are respectively and fixedly connected on the vertical rod (12), the rotating wheel (8) is arranged between the first magnet (6) and the second magnet (7), the rotating wheel (8) is rotationally connected with the track (2), the cutting ring (9) is fixedly connected on the rotating wheel (8), and the cutting ring (9) is connected with the braking mechanism through the conductive component;
the electric conduction assembly comprises an electromagnetic block (3), a wrapping sleeve (10), an electric conduction block (11), a first lead body (13) and a second lead body (14), wherein the wrapping sleeve (10) is wound on a rotating wheel (8), the cutting ring (9) is connected with the electric conduction block (11) through the wrapping sleeve (10), the first lead body (13) and the second lead body (14) are wrapped in the wrapping sleeve (10), two ends of the cutting ring (9) are respectively electrically connected with the electric conduction block (11) through the first lead body (13) and the second lead body (14), the electric conduction block (11) is electrically connected with the electromagnetic block (3), and the electric conduction block (11) slides in a vertical rod (12);
the braking mechanism comprises a magnet (15), a fixed ring (16), a sliding rod (17), a connecting rod (18), a rotary convex gear (19), a rack (20) and a clamping head (21), wherein the magnet (15) is arranged below the electromagnetic block (3), the magnet (15) is in sliding connection with the mounting plate (4), the mounting plate (4) is fixedly connected with the car (1), the magnet (15) is fixedly connected with the sliding rod (17), the sliding rod (17) is arranged in the fixed ring (16) in a penetrating manner, the fixed ring (16) is fixedly connected with the mounting plate (4), the magnet (15) is elastically connected with the fixed ring (16), the connecting rod (18) is respectively and rotatably connected with two sides of the sliding rod (17), the sliding rod (17) is in eccentric rotary connection with the corresponding rotary convex gear (19) through the connecting rod (18), the rotary convex gear (19) is in rotary connection with the mounting plate (4), the rack (20) is arranged below the rotary convex gear (19) and is in sliding connection with the car (1), and the rack (20) is elastically connected with the rack (20) in a meshed manner.
2. The safety brake device for an elevator according to claim 1, wherein: the anti-collision protection mechanism comprises a shell (22), a driven rod (23), an air bag (24), a battery (25), an igniter (26), a first conducting strip (27) and a second conducting strip (28), wherein the rack (20) and the driven rod (23) are fixedly connected, the igniter (26) is installed on the driven rod (23), the battery (25) is installed on the shell (22), the shell (22) is fixedly connected on the car (1), the first conducting strip (27) is fixedly connected on the igniter (26), the second conducting strip (28) is fixedly connected on the battery (25), the igniter (26) is located in the air bag (24), the driven rod (23) is elastically connected with the shell (22), a sealing box (29) is filled in the air bag (24), the igniter (26) is located in the sealing box (29), compressed gas is filled in the sealing box (29), the bottom of the car (1) is fixedly connected with a bottom plate (5), and an air bag (24) is arranged in the bottom plate (5).
3. The safety brake device for an elevator according to claim 2, characterized in that: the gas is guanidine nitrate gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210821842.8A CN115072521B (en) | 2022-07-13 | 2022-07-13 | Safety braking device for elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210821842.8A CN115072521B (en) | 2022-07-13 | 2022-07-13 | Safety braking device for elevator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115072521A CN115072521A (en) | 2022-09-20 |
| CN115072521B true CN115072521B (en) | 2024-04-12 |
Family
ID=83259215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210821842.8A Active CN115072521B (en) | 2022-07-13 | 2022-07-13 | Safety braking device for elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115072521B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203612773U (en) * | 2013-12-02 | 2014-05-28 | 浙江大学 | Novel elevator shaft safety device |
| CN105384033A (en) * | 2015-12-01 | 2016-03-09 | 王向东 | Permanent magnet emergency slowing-down device used for lifting type elevator |
| WO2018103111A1 (en) * | 2016-12-05 | 2018-06-14 | 中国矿业大学 | Intelligent fall protection method and device for hoisting system of deep well |
| CN207890849U (en) * | 2018-01-23 | 2018-09-21 | 北京慕尼黑电梯有限公司 | A kind of elevator fall protection equipment |
| CN110342368A (en) * | 2018-04-04 | 2019-10-18 | 迈格钠磁动力股份有限公司 | The slow safety guard of elevator permanent-magnet and elevator |
| WO2020134225A1 (en) * | 2018-12-29 | 2020-07-02 | 刘英辉 | Linear driving apparatus, safety gear apparatus, and method for controlling elevator system |
| CN112225028A (en) * | 2020-12-17 | 2021-01-15 | 广东梯云科技有限公司 | Current-sensing elevator operation data acquisition system and acquisition method thereof |
| CN214359622U (en) * | 2020-12-22 | 2021-10-08 | 张无梦 | Electromagnetic induction starting type elevator bearing room emergency landing control device |
| CN114314262A (en) * | 2021-12-30 | 2022-04-12 | 海南大学 | Elevator braking system |
-
2022
- 2022-07-13 CN CN202210821842.8A patent/CN115072521B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203612773U (en) * | 2013-12-02 | 2014-05-28 | 浙江大学 | Novel elevator shaft safety device |
| CN105384033A (en) * | 2015-12-01 | 2016-03-09 | 王向东 | Permanent magnet emergency slowing-down device used for lifting type elevator |
| WO2018103111A1 (en) * | 2016-12-05 | 2018-06-14 | 中国矿业大学 | Intelligent fall protection method and device for hoisting system of deep well |
| CN207890849U (en) * | 2018-01-23 | 2018-09-21 | 北京慕尼黑电梯有限公司 | A kind of elevator fall protection equipment |
| CN110342368A (en) * | 2018-04-04 | 2019-10-18 | 迈格钠磁动力股份有限公司 | The slow safety guard of elevator permanent-magnet and elevator |
| WO2020134225A1 (en) * | 2018-12-29 | 2020-07-02 | 刘英辉 | Linear driving apparatus, safety gear apparatus, and method for controlling elevator system |
| CN112225028A (en) * | 2020-12-17 | 2021-01-15 | 广东梯云科技有限公司 | Current-sensing elevator operation data acquisition system and acquisition method thereof |
| CN214359622U (en) * | 2020-12-22 | 2021-10-08 | 张无梦 | Electromagnetic induction starting type elevator bearing room emergency landing control device |
| CN114314262A (en) * | 2021-12-30 | 2022-04-12 | 海南大学 | Elevator braking system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115072521A (en) | 2022-09-20 |
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