CN100416127C - Internal expanding electromagnetic braker - Google Patents
Internal expanding electromagnetic braker Download PDFInfo
- Publication number
- CN100416127C CN100416127C CNB2006100238369A CN200610023836A CN100416127C CN 100416127 C CN100416127 C CN 100416127C CN B2006100238369 A CNB2006100238369 A CN B2006100238369A CN 200610023836 A CN200610023836 A CN 200610023836A CN 100416127 C CN100416127 C CN 100416127C
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- brake arm
- brake
- supporting base
- armature
- internal expanding
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Abstract
The present invention discloses a kind of inner expanding electromagnetic brake. It includes a brake, said brake is fixed on a fixing component supporting seat, it also includes a brake arm, two ends of said brake arm are equipped with a foot portion respectively. The described supporting seat also is equipped with supporting seat projection portion which is opposite to the brake arm foot portion, and between said brake arm foot portion and supporting seat projection portion several guide pin shafts are set, and the described brake arm can be moved relatively to supporting seat projection portion along the length direction of guide pin shaft. Said inner expanding electromagnetic brake can be used as brake of elevator towing machine.
Description
Technical field
The present invention relates to a kind of electromagnetic brake, relate in particular to a kind of internal expanding electromagnetic braker that is used for gearless permanent-magnet synchronous traction machine.
Background technique
Existing electromagnetic brake, great majority are disk type braker and the outer drum brake of embracing.Disk type braker is pressed on brake strip two sides of brake puck when braking, drum brake is pressed on brake strip the outer peripheral surface of brake drum when braking.The useful space, the motion and sound that these two kinds of breaks often are difficult to make full use of hoist machine is big, braking surface may be caused that braking moment descends by traction steel-cable oil pollution.
Internal expanding electromagnetic braker can solve the deficiency that above-mentioned two kinds of breaks exist preferably.Whole internal expanding electromagnetic braker is arranged in the inside of brake drum, during braking brake strip is pressed on the inner peripheral surface of brake drum with expanding outwardly.Whole break has that the useful space, the motion and sound that can make full use of hoist machine are less, braking surface can not caused degradation advantage under the braking moment by traction steel-cable oil pollution.
At present, internal expanding electromagnetic braker has especially begun to have some application at lift machine on gearless permanent-magnet synchronous traction machine.
Japanese patent specification spy opened 2002-242961 (P2002-242961A) (open day: on August 28th, 2002) disclose a kind of internal expanding electromagnetic braker.This break is that two keeping arms of top and the bottom evagination from fixed iron core come the clamping brake arm, frictional force produces when bearing braking the reaction force and the moment of reaction.
This brake structural exists following defective and deficiency:
1, because two keeping arms of evagination is cantilever structure, and cantilever is longer, drag friction power makes keeping arm produce bigger moment of flexure during braking, and break is when braking, frictional force produces break when having only a keeping arm, brake arm to have only an end face to bear braking in two end faces up and down in two keeping arms the reaction force and the moment of reaction, so the ability to bear of the break reaction force that frictional force produces during to braking and the moment of reaction is relatively poor.
2, the degrees of freedom of this break brake arm action is more, and brake arm is except moving in the braking force direction, and brake arm is all possible in the motion of all the other directions, and this can reduce the stability and the reliability of break action.
Japanese patent specification spy opened 2003-301876 (P2003-301876A) (open day: on October 24th, 2003) disclosed a kind of internal expanding electromagnetic braker, be that many guiding bearing pins and springs are set between the foot at the top and the bottom of fixed iron core and brake arm two ends, space in fixed iron core and brake arm encirclement is provided with armature, frictional force produced when fixed iron core bore braking by the foot at top and the bottom, guiding bearing pin, spring, brake arm two ends the reaction force and the moment of reaction.
This brake structural exists following defective and deficiency:
1, spring force is positioned at brake arm two ends up and down, because it is longer that brake arm bears the cantilever of spring force, make brake arm produce bigger moment of flexure, and because cantilever is longer, drag friction power makes guiding bearing pin and spring produce bigger moment of flexure during braking, so the ability to bear of the break reaction force that frictional force produces during to braking and the moment of reaction is relatively poor.
2, lay many guiding bearing pins and spring because fixed iron core need be vacateed certain space in top and the bottom, make effective electromagnetism adsorption area reduce.In limited structure space, be difficult to obtain needed electromagnetic force output.For obtaining enough electromagnetic force output, need more space.
3, can not dismantle separately owing to brake arm, be placed in the lubricative axle sleeve that in the brake arm, between brake arm and guiding bearing pin, is provided with when changing if desired, whole break must be disassembled just can carry out, bring the trouble of break adjustment and dismounting.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of internal expanding electromagnetic braker, it to when braking the reaction force that produces of frictional force and the ability to bear of the moment of reaction better, action is stable more and reliable.
For solving the problems of the technologies described above, internal expanding electromagnetic braker of the present invention, carrying out the interval at the circumferencial direction of the inner peripheral surface of brake drum arranges, break is fixed on the fixing member supports seat, wherein, brake arm two ends in the longitudinal direction is respectively equipped with foot, described supporting base is provided with the supporting base jut relative with brake arm foot, be provided with many guiding bearing pins between brake arm foot and the supporting base jut, described brake arm can move with respect to the supporting base jut along guide finger shaft length direction.
Internal expanding electromagnetic braker of the present invention except some common advantage that possess existing internal expanding brake, also has following characteristics simultaneously:
When 1, break is braked, supporting base bears the reaction force and the moment of reaction that drag friction power produces by the foot at supporting base jut, many lead bearing pin, brake arm two ends, because the cantilever of this force structure is shorter, the reaction force that frictional force produces when making this break to braking and the ability to bear of the moment of reaction are better.
2, the top and the bottom of fixed iron core are not provided with the keeping arm of evagination, do not need vacating space to lay many guiding bearing pins yet, make that the stressing conditions of fixed iron core is better.
3, be provided with many guiding bearing pins between brake arm foot and the supporting base jut, make brake arm to move with respect to the supporting base jut along guide finger shaft length direction, reduce the possibility of brake arm, make that the action of brake arm is stable more and reliable in other direction motions.
4, brake arm can conveniently be dismantled, and the operation and the adjustment of changing for the brake strip be contained on the brake arm and lubricative axle sleeve if desired bring more convenience.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structural drawing of first kind of mode of execution of internal expanding electromagnetic braker of the present invention;
Wherein Fig. 1 a is a plan view;
Fig. 1 b is the fragmentary cross-sectional view of Fig. 1 a;
Fig. 2 is the structural drawing of supporting base jut in first kind of mode of execution of internal expanding electromagnetic braker of the present invention;
Wherein Fig. 2 a is a plan view;
Fig. 2 b is the fragmentary cross-sectional view of Fig. 2 a;
Fig. 3 is the profile of brake arm in first kind of mode of execution of internal expanding electromagnetic braker of the present invention;
Fig. 4 is the profile of fixed iron core in first kind of mode of execution of internal expanding electromagnetic braker of the present invention;
Fig. 5 is the structural drawing of guiding bearing pin in first kind of mode of execution of internal expanding electromagnetic braker of the present invention;
Fig. 6 is the structural drawing of second kind of mode of execution of internal expanding electromagnetic braker of the present invention;
Fig. 7 is the structural drawing of supporting base jut in second kind of mode of execution of internal expanding electromagnetic braker of the present invention.
Embodiment
In the following description, the reel etc. that is integral rotation the solid of rotation of hoist machine and with the hoist machine solid of rotation explains as the brake drum of internal expanding electromagnetic braker.
First kind of mode of execution of internal expanding electromagnetic braker of the present invention as shown in Figure 1.Internal expanding electromagnetic braker carries out the interval layout at the circumferencial direction of the inner peripheral surface 1a of brake drum 1, break is fixed on the fixing member supports seat 2, and the main structure of this break comprises: fixed iron core 7, armature 8, field coil 6, spring 9, spring bearer plate 10, spring force are regulated bolt 11, half-round head square neck bolt 12, shell fragment 15, brake arm 3, brake strip 17, supporting base jut 2a etc.
As shown in Figure 1, 2, brake arm 3 two ends in the longitudinal direction is respectively equipped with the 3a of foot, and supporting base 2 is provided with the supporting base jut 2a relative with the 3a of brake arm foot, and supporting base jut 2a and supporting base 2 are the complete integral body that a branch be unable to do without.Between 3a of brake arm foot and supporting base jut 2a, be provided with many guiding bearing pins 4.Between 3a of brake arm foot and guiding bearing pin 4, be provided with lubricative axle sleeve 5.Lubricative axle sleeve 5 is for exempting from lubrication sliding bearing, and lubricative axle sleeve 5 is packed into behind the 3a of brake arm foot, with the axle sleeve back-up ring 21 interference 3a of brake arm foot that packs into, may break away from the 3a of brake arm foot to prevent lubricative axle sleeve 5.
Break is in when action, and brake arm 3 moves with respect to supporting base 2 along guiding bearing pin 4 length directions, the torque that frictional force produced when the foot 3a of supporting base 2 by supporting base jut 2a, many guiding bearing pins 4, brake arm 3 two ends bore braking.Because the cantilever of this force structure is shorter, the ability to bear of the torque that frictional force produces when making break to braking is better relatively.The effect of lubricative axle sleeve 5 is wearing and tearing of guiding bearing pin when reducing the brake arm action.
Shown in Fig. 1,4, fixed iron core 7 is fixed on the supporting base 2 by many bolts 18, and the field coil 6 of runway shape embeds among the groove 7c of fixed iron core 7, adopts insulating resin that field coil 6 is fixed.Relative plane 7a, 8a is magnetic adsorption plane separately between fixed iron core 7 and the armature 8, and the magnetic adsorption plane of fixed iron core 7 and armature 8 all is roughly rectangle on plan view.Be provided with spring 9, spring bearer plate 10, spring force adjusting bolt 11 that attachment bolt 16 and quantity are many between fixed iron core 7 and the armature 8.Spring 9 is contained in the circular hole 7b of fixed iron core 7, and in enforcement state as shown in Figure 1, spring 9 is to be in confined state.
The part of the external cylindrical surface 10a of spring bearer plate 10 is installed among the circular hole 7b of fixed iron core, and another part is installed among the light cove 8b of armature.The effect of spring bearer plate 10 is, except the impacting force that can transmit spring, two spring bearer plates 10 can also make armature 8 and fixed iron core 7 relative positioning accurately up and down, and prevent that the axis of magnetic adsorption plane 7a around attachment bolt 16 positions of the magnetic adsorption plane 8a relative fixed iron core 7 of armature 8 from rotating motion.
Regulation spring power is regulated bolt 11, can be on the spring force direction mobile spring pressing plate 10, the reduction length of Regulation spring 9 is realized the adjusting to spring force, the spring force of generation is regulated bolt 11 and is delivered on the armature 8 by spring bearer plate 10, spring force.
Part position at the magnetic adsorption plane 7a of fixed iron core 7 is provided with shallow circular groove 7d, the rubber buffer (not shown) is packed among the shallow circular groove 7d of fixed iron core 7, and its effect is that the magnetic adsorption plane 8a of armature 8 in the time of can further reducing field coil 6 energisings is gone up the impact noise that produces by magnetic to the magnetic adsorption plane 7a of fixed iron core 7.
Shown in Fig. 1,3, be provided with two parallel half-round head square neck bolts 12 between armature 8 and the brake arm 3, half-round head square neck bolt 12 threaded end 12a and armature 8 can regulate in a spiral manner connect freely, lock with nut 13, half-round head square neck bolt 12 has an end 12b of cup head to connect with brake arm 3 by spheric seating 14, shell fragment 15, shell fragment housing screw 19.Adopt screw that brake strip 17 is fixed on the brake arm 3.
Half-round head square neck bolt 12 threaded end 12a can regulate freely on the tapped hole 8d of armature 8 and advance and retreat, and regulate the back and lock with nut 13.Like this and spheric seating 14, shell fragment 15, shell fragment housing screw 19 just can regulate the distance on the braking force direction between brake arm 3 and the armature 8 together easily.Thereby realize adjusting to gap between the inner peripheral surface 1a that is contained in brake strip 17 on the brake arm 3 and brake drum 1 under the non-braking state.
The axis of the axis of half-round head square neck bolt 12 and spring 9 is provided with more approachingly, and it is shorter to make that armature 8 bears the cantilever of spring force, reduces moment of flexure that armature 8 is produced, thereby can reduce the strength and stiffness requirement to armature 8.
Shown in Fig. 1,5, guiding bearing pin 4 is fixed on the supporting base jut 2a by Cock screw 20.When brake arm 3 has dismounting to need, at first half-round head square neck bolt 12 and spheric seating 14 are broken away from from brake arm 3.Then Cock screw 20 is unscrewed, the bearing pin 4 that will lead moves toward armature 8 directions, and guiding bearing pin 4 is broken away from from brake arm 3, realizes the dismounting to brake arm 3.Be moving of convenient guiding bearing pin 4, be provided with the groove of sawtooth like shape at the head 4a place of guiding bearing pin 4, armature 8 is provided with shallow circular groove 8c in corresponding position simultaneously, for guiding bearing pin 4 provides enough mobile spaces.The convenience of brake arm 3 dismountings brings more convenience because of operation and the adjustment that wearing and tearing need to change for the brake strip 17 and the lubricative axle sleeve 5 that are contained on the brake arm 3.
About detection, as shown in Figure 1 to armature movement.Be provided with the sensitive switch 22 that is fixed on the fixed iron core 7, switch bull stick 23 free to rotate, be provided with the screw 24 that is installed in can regulate advance and retreat on the switch bull stick 23, be provided with the detection board 25 that is fixed on the armature 8, be provided with the screw 26 that is installed in can regulate advance and retreat on the detection board 25.When field coil 6 energising or attachment bolt 16 are tightened, the magnetic adsorption plane 8a of armature is moved on the magnetic adsorption plane 7a of fixed iron core, be installed in detection board 25 screwings 26 pushing switch bull sticks 23 and rotate.Be installed in the plunger head of the screw 24 extruding sensitive switches 22 on the switch bull stick 23, the control system that the relevant signal that sensitive switch 22 moves armature 8 sends to hoist machine realizes the detection to armature movement.By rotating screw 24 distance between adjusting screw 24 and the sensitive switch 22 plunger heads easily.By rotating screw 26 distance between adjusting screw 26 and the switch bull stick 23 easily.Feasible mounting point required precision to sensitive switch 22, switch bull stick 23, detection board 25 can correspondingly reduce.Loosening in order to prevent that screw 24 and screw 26 from taking place when moving simultaneously, on screw 24 and screw 26, be equipped with nut.
Second kind of mode of execution of internal expanding electromagnetic braker of the present invention as shown in Figure 6.Supporting base jut 2a is two parts can separating with supporting base 2.The structure of supporting base jut 2a as shown in Figure 7, supporting base jut 2a extends supporting base plate-like portion 2b, is provided with many through hole 2c and regulates window 2d on supporting base plate-like portion 2b.Supporting base jut 2a and supporting base plate-like portion 2b pass through hole 2c by many bolts 27 and are fixed on the supporting base 2.By regulating window 2d, can realize operation to several adjustable bolts.A distinguishing feature of this mode of execution is, for the dismounting of brake arm 3 with reinstall providing more convenience property.When brake arm 3 has dismounting to need, at first half-round head square neck bolt 12 and spheric seating 14 are broken away from from brake arm 3, then bolt 27 is backed out, supporting base jut 2a, supporting base plate-like portion 2b, brake arm 3, guiding bearing pin 4 are together disassembled from supporting base 2.Guiding bearing pin 4 is broken away from from brake arm 3, realize dismounting brake arm 3.The process that brake arm 3 is reinstalled is opposite with above-mentioned unloading process.The convenience of brake arm 3 dismounting brings more convenience because of operation and the adjustment that wearing and tearing need to change for the brake strip 17 and the lubricative axle sleeve 5 that are contained on the brake arm 3.The structural type of other of second kind of mode of execution, operating principle and first kind of mode of execution of the present invention are identical.
Internal expanding electromagnetic braker of the present invention, its elemental motion comprise braking maneuver and discharge the action of declutching of braking.The principle of braking maneuver is that the fixed iron core 7 of break is fixed on the supporting base 2 by many bolts 18.When the field coil 6 in being contained in fixed iron core 7 cuts off the power supply, by the impacting force of spring 9, armature 8 is expanded outwardly, armature 8 expands outwardly brake arm 3 by promotion nut 13, half-round head square neck bolt 12, spheric seating 14.Brake strip 17 is pressed on the inner peripheral surface 1a of brake drum 1, brake drum 1 is produced braking force, realize the braking maneuver of break.The principle of moving that declutches is that when field coil 6 energisings, the electromagnetic force between armature 8 and the fixed iron core 7 is understood the impacting force of antagonistic spring 9.The magnetic adsorption plane 8a of armature can be by magnetic to the magnetic adsorption plane 7a of fixed iron core, armature 8 retracts brake arm 3 simultaneously by half-round head square neck bolt 12, shell fragment 15, shell fragment housing screw 19, brake strip 17 is broken away from from the inner peripheral surface 1a of brake drum 1, the braking of brake drum 1 is released, and realizes the action of declutching of break.The another kind of mode that realizes the action of declutching of break is, by tightening attachment bolt 16, can be when field coil 6 outages the impacting force of antagonistic spring 9.The magnetic adsorption plane 8a of armature is moved on the magnetic adsorption plane 7a of fixed iron core, can be retracted simultaneously with armature 8 joining brake arms 3, brake strip 17 is broken away from from the inner peripheral surface 1a of brake drum 1, and the braking of brake drum 1 is released, and realizes declutching action.
Internal expanding electromagnetic braker of the present invention,, braking surface less except the useful space that can make full use of hoist machine, the motion and sound that possess existing internal expanding brake can not caused by traction steel-cable oil pollution under the braking moment some common advantage of degradation, advantages such as the reaction force that frictional force produces when also having braking simultaneously and the ability to bear of the moment of reaction are better, and action is stable more and reliable.The present invention can be used as lift machine, and especially the break in the gearless permanent-magnet synchronous traction machine uses.
Claims (6)
1. internal expanding electromagnetic braker, carrying out the interval at the circumferencial direction of the inner peripheral surface of brake drum arranges, break is fixed on the fixing member supports seat, it is characterized in that: brake arm two ends in the longitudinal direction is respectively equipped with foot, described supporting base is provided with the supporting base jut relative with brake arm foot, be provided with many guiding bearing pins between brake arm foot and the supporting base jut, described brake arm can move with respect to the supporting base jut along guide finger shaft length direction.
2. internal expanding electromagnetic braker as claimed in claim 1 is characterized in that: described supporting base jut and supporting base are one-body molded.
3. internal expanding electromagnetic braker as claimed in claim 1 is characterized in that: described supporting base jut adopts fastening piece to fixedly connected with supporting base.
4. internal expanding electromagnetic braker as claimed in claim 1, it is characterized in that: relative plane is separately magnetic adsorption plane between the fixed iron core of described break and the armature, the magnetic adsorption plane of fixed iron core and armature is roughly rectangle, be provided with spring, spring bearer plate, spring force adjusting bolt that attachment bolt and quantity are many between fixed iron core and the armature, the part of the external cylindrical surface of described spring bearer plate is installed in the circular hole of fixed iron core, and another part is installed in the light cove of armature.
5. internal expanding electromagnetic braker as claimed in claim 1, it is characterized in that: be provided with two parallel half-round head square neck bolts between the armature of described break and the brake arm, the threaded end of half-round head square neck bolt and armature can regulate in a spiral manner connect freely, lock with nut, half-round head square neck bolt has an end of cup head to pass through spheric seating, shell fragment, the shell fragment housing screw connects with brake arm, described spheric seating has an end of sphere to connect with half-round head square neck bolt, spheric seating has an end on plane to connect with the light cove of brake arm, described shell fragment is for having the elastic material component of elastic potential energy under normal conditions to the crimping direction of spheric seating, shell fragment connects with brake arm by the shell fragment housing screw, and shell fragment has an end of cup head to connect by two tips on the length direction with half-round head square neck bolt.
6. internal expanding electromagnetic braker as claimed in claim 2 is characterized in that: the groove that is provided with the sawtooth like shape at the head of described guiding bearing pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100238369A CN100416127C (en) | 2006-02-13 | 2006-02-13 | Internal expanding electromagnetic braker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100238369A CN100416127C (en) | 2006-02-13 | 2006-02-13 | Internal expanding electromagnetic braker |
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| Publication Number | Publication Date |
|---|---|
| CN101021237A CN101021237A (en) | 2007-08-22 |
| CN100416127C true CN100416127C (en) | 2008-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100238369A Expired - Fee Related CN100416127C (en) | 2006-02-13 | 2006-02-13 | Internal expanding electromagnetic braker |
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| CN (1) | CN100416127C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106369076B (en) * | 2016-11-22 | 2018-05-22 | 重庆凸普科技有限公司 | A kind of energized electromagnet drum brake |
| CN106369077B (en) * | 2016-11-22 | 2018-04-20 | 重庆凸普科技有限公司 | A kind of double T electromagnetism ventilation drum brakes of electricity cut-off type |
| CN106351986B (en) * | 2016-11-22 | 2018-04-20 | 重庆凸普科技有限公司 | A kind of double T electromagnet drum brakes of electricity cut-off type |
| EP3330123B1 (en) * | 2016-11-30 | 2020-09-09 | TF-Metal Co., Ltd. | Brake device of vehicular seat adjuster |
| CN112178076A (en) * | 2020-10-26 | 2021-01-05 | 广州视源电子科技股份有限公司 | Electromagnetic brake and vehicle |
| CN113930720B (en) * | 2021-07-23 | 2024-04-09 | 江苏高光半导体材料有限公司 | Magnetic stripe assembling and disassembling device for metal mask magnet plate |
| CN113685459B (en) * | 2021-08-26 | 2022-04-26 | 珠海格力电器股份有限公司 | Motor shaft brake and servo motor |
| CN115849231B (en) * | 2022-12-26 | 2024-05-31 | 兰州理工大学 | Permanent magnet eddy current brake and winch brake system suitable for winch brake |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1151107A (en) * | 1966-07-28 | 1969-05-07 | Otis Elevator Co | Brake Shoe Mounting. |
| JP2002317838A (en) * | 2001-04-20 | 2002-10-31 | Mitsubishi Electric Corp | Electromagnet and braking device using the same |
| JP2003176842A (en) * | 2001-12-11 | 2003-06-27 | Sanyo Kogyo Kk | Brake device |
| JP2003201081A (en) * | 2002-01-08 | 2003-07-15 | Mitsubishi Electric Corp | Electromagnetic braking device for elevator lifting machine |
| CN1449357A (en) * | 2001-07-05 | 2003-10-15 | 三菱电机株式会社 | Elevator traction machine and brake system |
| JP2005016649A (en) * | 2003-06-27 | 2005-01-20 | Mitsubishi Electric Corp | Brake structure of hoist |
| CN1646824A (en) * | 2002-04-05 | 2005-07-27 | 小仓离合器有限公司 | Electromagnetic drum brake |
-
2006
- 2006-02-13 CN CNB2006100238369A patent/CN100416127C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1151107A (en) * | 1966-07-28 | 1969-05-07 | Otis Elevator Co | Brake Shoe Mounting. |
| JP2002317838A (en) * | 2001-04-20 | 2002-10-31 | Mitsubishi Electric Corp | Electromagnet and braking device using the same |
| CN1449357A (en) * | 2001-07-05 | 2003-10-15 | 三菱电机株式会社 | Elevator traction machine and brake system |
| JP2003176842A (en) * | 2001-12-11 | 2003-06-27 | Sanyo Kogyo Kk | Brake device |
| JP2003201081A (en) * | 2002-01-08 | 2003-07-15 | Mitsubishi Electric Corp | Electromagnetic braking device for elevator lifting machine |
| CN1646824A (en) * | 2002-04-05 | 2005-07-27 | 小仓离合器有限公司 | Electromagnetic drum brake |
| JP2005016649A (en) * | 2003-06-27 | 2005-01-20 | Mitsubishi Electric Corp | Brake structure of hoist |
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|---|---|
| CN101021237A (en) | 2007-08-22 |
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