CN213475335U - Lifting device for power equipment - Google Patents
Lifting device for power equipment Download PDFInfo
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- CN213475335U CN213475335U CN202020745830.8U CN202020745830U CN213475335U CN 213475335 U CN213475335 U CN 213475335U CN 202020745830 U CN202020745830 U CN 202020745830U CN 213475335 U CN213475335 U CN 213475335U
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- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 238000004804 winding Methods 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 13
- 239000000428 dust Substances 0.000 claims description 11
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000003028 elevating effect Effects 0.000 abstract description 9
- 210000004243 sweat Anatomy 0.000 abstract description 3
- 230000009977 dual effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 30
- 230000017525 heat dissipation Effects 0.000 description 22
- 238000001816 cooling Methods 0.000 description 15
- 230000005855 radiation Effects 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of elevating gear is maintained to electric power, especially, a elevating gear for power equipment, to current elevating gear, lifting function is single, and does not set up and keep off positive and heat sink, causes the staff sweat stream to present the back of the body easily to having increased the work degree of difficulty, having reduced work efficiency's problem, having proposed following scheme now, it includes fixed box, and the bottom of fixed box is provided with four universal wheels, the top fixed mounting of fixed box has four support columns, and the top has all been seted up to the inboard of four support columns and has been the open-ended breach groove, and four equal slidable mounting in the breach groove have a lift pillar, and four inboard equal slidable mounting of lift pillar have same operation panel. The utility model discloses can dual improvement lift height, improve the lift effect, can cool down and the sunshade to the staff, can provide comfortable operational environment for the staff, reduce the work degree of difficulty, and then can improve work efficiency.
Description
Technical Field
The utility model relates to an electric power maintenance elevating gear technical field especially relates to an elevating gear for power equipment.
Background
The electric power is energy using electric energy as power, the generation and application of the electric power is electric power production consisting of links such as power generation, power transmission, power transformation, power distribution and power utilization, the primary energy in the nature is converted into the electric power through a mechanical energy device, then the electric power is supplied to each user through the power transmission, the power transformation and the power distribution, the electric power is inevitably damaged when in use, the maintenance and the repair are required regularly, and when a worker repairs electric power equipment at a high place, the lifting device is often required.
Current elevating gear, lifting function is single, and does not set up and keep off yang and heat sink, and the staff who maintains power equipment in summer easily because weather is sweltered hot and sweat streams down the back to increasing the work degree of difficulty, reduced work efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving current elevating gear, lifting function is single, and does not set up and keep off positive and heat sink, causes the staff sweat to flow down the back easily to increasing the work degree of difficulty, having reduced work efficiency's shortcoming, and the elevating gear who is used for power equipment who proposes.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a elevating gear for power equipment, includes fixed box, the bottom of fixed box is provided with four universal wheels, the top fixed mounting of fixed box has four support columns, the top has all been seted up to the inboard of four support columns and has been the open-ended breach groove, four equal slidable mounting in the breach groove have a lifting support, four equal slidable mounting in the lifting support inboard have same operation panel, the top fixed mounting of operation panel has two sunshade heat radiation structure, perpendicular rotation installs four threaded rods on the fixed box, threaded groove has all been seted up to the bottom of four lifting support columns, four threaded rods respectively with four threaded groove threaded connection, be provided with actuating mechanism in the fixed box, four threaded rods all with actuating mechanism looks adaptation.
Preferably, the equal fixed mounting in the outside of four support columns has a rolling structure, all is connected with the one end of steel wire stay cord on four rolling structures, the other end of four steel wire stay cords all with the top fixed connection of operation panel, the top of four lift columns all is provided with two guide pulleys, steel wire stay cord and two guide pulley sliding connection that correspond.
Preferably, sunshade heat radiation structure includes two sunshade branches, sunshading board and cooling structure, and the equal fixed mounting of two sunshade branches has the top of operation panel, and sunshading board fixed mounting is on the top of two sunshade branches, and cooling structure sets up the bottom at the sunshading board, and cooling structure includes heat dissipation motor, heat dissipation fan and dust screen, and heat dissipation fan fixed mounting is on the output shaft of heat dissipation motor, and dust screen fixed mounting all is located the dust screen at the bottom heat dissipation motor and the heat dissipation fan of sunshading board.
Preferably, actuating mechanism includes servo motor, horizontal pole, two twill covers, four sprockets and two chains, and four sprockets are fixed the cover respectively and are established in the outside of four threaded rods, and the chain meshing is in the outside of two sprockets that correspond, and servo motor fixed connection is in fixed box, and horizontal pole rotates and installs on the bottom inner wall of fixed box, and two twill covers are all established in the outside of horizontal pole, two threaded rod meshes in two twill covers and four threaded rods.
Preferably, the guide way has all been seted up to four lift pillars's inboard, and equal slidable mounting has the guide block in four guide ways, four guide blocks all with operation panel fixed mounting, and the spacing groove has all been seted up to four lift pillars's both sides, and equal fixed mounting has spacing on the both sides inner wall in four breach grooves, spacing and the spacing groove sliding connection who corresponds.
Preferably, the winding structure includes motor box, rolling motor and rolling wheel, and motor box fixed connection is in the outside of support column, and rolling motor fixed connection is in the motor box, and rolling wheel and rolling motor's output shaft fixed mounting, rolling wheel and the steel wire stay cord fixed connection that corresponds, steel wire stay cord and motor box swing joint, the same control switch of equal fixedly connected with on four rolling motors, the last positive and negative switch that is connected with of servo motor, four rolling motors are synchronous machine.
Compared with the prior art, the utility model has the advantages of:
(1) according to the scheme, the driving mechanism drives the four threaded rods to rotate simultaneously, the four threaded rods are identical in rotating direction and drive the lifting support columns to move upwards, the four lifting support columns drive the operating plate to move upwards, and the steel wire pull ropes are wound through the winding structure, so that the operating plate moves upwards on the four lifting support columns, the height of the operating plate can be further improved, and the lifting height is improved;
(2) shelter from sunshine through the sunshading board, lower the temperature to the staff through the cooling knot, can lower the temperature the sunshade to the staff, can provide comfortable operational environment for the staff.
The utility model discloses can dual improvement lift height, improve the lift effect, can cool down and the sunshade to the staff, can provide comfortable operational environment for the staff, reduce the work degree of difficulty, and then can improve work efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a lifting device for an electrical apparatus according to the present invention;
fig. 2 is a schematic side view of the operation panel, the guide block, the sunshade support rod, the sunshade plate and the cooling structure of the lifting device for power equipment according to the present invention;
fig. 3 is a schematic view of a top view structure of a fixing box, a servo motor, a transverse round bar and a threaded bar of a lifting device for power equipment according to the present invention;
fig. 4 is an illustration of an explosion structure of the fixing box, the supporting column and the lifting pillar of the lifting device for power equipment according to the present invention.
In the figure: the device comprises a fixed box 1, a universal wheel 2, a support column 3, a notch groove 4, a lifting support column 5, a guide groove 6, a guide block 7, an operation plate 8, a sun-shading support rod 9, a sun-shading board 10, a cooling structure 11, a thread groove 12, a threaded rod 13, a guide wheel 14, a winding structure 15, a steel wire pull rope 16, a servo motor 17, a transverse round rod 18, a twill sleeve 19, a chain 20, a limiting groove 21 and a limiting strip 22.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments, but not all embodiments.
Example one
Referring to fig. 1-4, a lifting device for power equipment, including fixed box 1, the bottom of fixed box 1 is provided with four universal wheels 2, the top fixed mounting of fixed box 1 has four support columns 3, the top is open-ended breach groove 4 all has been seted up to the inboard of four support columns 3, equal slidable mounting has lifting strut 5 in four breach groove 4, equal slidable mounting has same operation panel 8 in four lifting strut 5 inboards, the top fixed mounting of operation panel 8 has two sunshade heat radiation structure, fixed box 1 is gone up to rotate perpendicularly and is installed four threaded rods 13, threaded groove 12 has all been seted up to the bottom of four lifting strut 5, four threaded rods 13 respectively with four threaded groove 12 threaded connection, be provided with actuating mechanism in the fixed box 1, four threaded rods 13 all with actuating mechanism looks adaptation.
In this embodiment, the equal fixed mounting in the outside of four support columns 3 has rolling structure 15, all is connected with the one end of steel wire stay cord 16 on four rolling structure 15, the other end of four steel wire stay cords 16 all with the top fixed connection of operation panel 8, the top of four lift pillars 5 all is provided with two guide pulleys 14, steel wire stay cord 16 and two guide pulleys 14 sliding connection that correspond, guide pulley 14 plays the supporting role to steel wire stay cord 16.
In this embodiment, sunshade heat radiation structure includes two sunshade branches 9, sunshading board 10 and cooling structure 11, the equal fixed mounting of two sunshade branches 9 has the top of operation panel 8, sunshading board 10 fixed mounting is on the top of two sunshade branches 9, cooling structure 11 sets up the bottom at sunshading board 10, cooling structure 11 includes the heat dissipation motor, heat dissipation fan and dust screen, heat dissipation fan fixed mounting is on the output shaft of heat dissipation motor, dust screen fixed mounting all is located the dust screen at the bottom heat dissipation motor of sunshading board 10 and heat dissipation fan, shelter from sunshine through sunshading board 10, the heat dissipation motor drives the heat dissipation fan and rotates the cooling that can blow.
In this embodiment, actuating mechanism includes servo motor 17, horizontal round bar 18, two twill covers 19, four sprockets and two chains 20, four sprockets are fixed the cover respectively and are established in the outside of four threaded rods 13, the outside of two sprockets that chain 20 meshing is corresponding, servo motor 17 fixed connection is in fixed box 1, horizontal round bar 18 rotates and installs on the bottom inner wall of fixed box 1, the outside at horizontal round bar 18 is all established to two twill covers 19, two threaded rods 13 meshing in two twill covers 19 and four threaded rods 13, servo motor 17 drives horizontal round bar 18 and rotates, horizontal round bar 18 drives two threaded rods 13 through two twill covers 19 and rotates, threaded rod 13 drives another threaded rod 13 through two sprockets that correspond and chain 20 and rotates, four threaded rods 13 rotate simultaneously, the direction of rotation of four threaded rods 13 is the same.
In this embodiment, guide way 6 has all been seted up to four lift pillars 5's inboard, equal slidable mounting has guide block 7 in four guide ways 6, four guide block 7 all with 8 fixed mounting of operation panel, spacing groove 21 has all been seted up to four lift pillars 5's both sides, equal fixed mounting has spacing 22 on four breach groove 4's the both sides inner wall, spacing 22 and the spacing groove 21 sliding connection that corresponds, spacing 22 cooperates the lift pillars 5 vertical direction with spacing groove 21, make lift pillars 5 only can carry out the vertical slip.
In this embodiment, winding structure 15 includes the motor box, rolling motor and rolling wheel, motor box fixed connection is in the outside of support column 3, rolling motor fixed connection is in the motor box, rolling wheel and rolling motor's output shaft fixed mounting, rolling wheel and the 16 fixed connection of the steel wire stay cord that corresponds, steel wire stay cord 16 and motor box swing joint, the same control switch of equal fixedly connected with on four rolling motors, be connected with positive and negative switch on the servo motor 17, four rolling motors are synchronous machine, rolling motor drives the rolling wheel and rotates and roll steel wire stay cord 16, it goes up and down to drive operation panel 8 through four steel wire stay cords 16.
Example two
Referring to fig. 1-4, a lifting device for power equipment, including fixed box 1, the bottom of fixed box 1 is provided with four universal wheels 2, there are four support columns 3 at the top of fixed box 1 through welding fixed mounting, the top is open-ended breach groove 4 all has been seted up to the inboard of four support columns 3, equal slidable mounting has lift pillar 5 in four breach groove 4, equal slidable mounting has same operation panel 8 in four lift pillar 5 inboards, there are two sunshade heat radiation structure at the top of operation panel 8 through welding fixed mounting, it installs four threaded rods 13 to rotate perpendicularly on the fixed box 1, threaded groove 12 has all been seted up to the bottom of four lift pillars 5, four threaded rods 13 respectively with four threaded groove 12 threaded connection, be provided with actuating mechanism in the fixed box 1, four threaded rods 13 all with actuating mechanism looks adaptation.
In this embodiment, four support column 3's the outside all has rolling structure 15 through welded fastening, all is connected with the one end of steel wire stay cord 16 on four rolling structure 15, and screw fixed connection is all passed through with operation panel 8's top to four steel wire stay cord 16's the other end, and four lift columns 5's top all is provided with two guide pulleys 14, steel wire stay cord 16 and two guide pulley 14 sliding connection that correspond, and guide pulley 14 plays the supporting role to steel wire stay cord 16.
In this embodiment, sunshade heat radiation structure includes two sunshade branches 9, sunshading board 10 and cooling structure 11, two sunshade branches 9 all install the top of operation panel 8 through welded fastening, sunshading board 10 passes through welded fastening and installs the top at two sunshade branches 9, cooling structure 11 sets up the bottom at sunshading board 10, cooling structure 11 includes the heat dissipation motor, heat dissipation fan and dust screen, the heat dissipation fan passes through welded fastening and installs on the output shaft of heat dissipation motor, the dust screen passes through welded fastening and installs the bottom heat dissipation motor and the heat dissipation fan at sunshading board 10 and all be located the dust screen, shelter from sunshine through sunshading board 10, the heat dissipation motor drives the heat dissipation fan and rotates the cooling of can blowing.
In this embodiment, the driving mechanism comprises a servo motor 17 and a transverse round bar 18, two twill covers 19, four sprockets and two chains 20, four sprockets are fixed the outside of establishing at four threaded rods 13 respectively, the outside of two sprockets that chain 20 meshing corresponds, servo motor 17 passes through screw fixed connection in fixed box 1, horizontal round bar 18 rotates and installs on the bottom inner wall of fixed box 1, the outside at horizontal round bar 18 is all established to two twill cover 19 covers, two threaded rods 13 meshing in two twill covers 19 and four threaded rods 13, servo motor 17 drives horizontal round bar 18 and rotates, horizontal round bar 18 drives two threaded rods 13 through two twill covers 19 and rotates, threaded rod 13 drives another threaded rod 13 through two sprockets that correspond and chain 20 and rotates, four threaded rods 13 rotate simultaneously, four threaded rods 13's direction of rotation is the same.
In this embodiment, guide way 6 has all been seted up to four lift pillars 5's inboard, equal slidable mounting has guide block 7 in four guide ways 6, four guide block 7 all pass through welded fastening with operation panel 8 and install, spacing groove 21 has all been seted up to four lift pillars 5's both sides, all install spacing 22 through welded fastening on four breach groove 4's the both sides inner wall, spacing 22 and the spacing groove 21 sliding connection who corresponds, spacing 22 cooperates the lift pillars 5 vertical direction with spacing groove 21, make lift pillars 5 only can carry out the vertical slip.
In this embodiment, winding structure 15 includes the motor box, winding motor and rolling wheel, the motor box passes through screw fixed connection in the outside of support column 3, winding motor passes through screw fixed connection in the motor box, the output shaft of rolling wheel and winding motor passes through welded fastening installation, the rolling wheel passes through screw fixed connection with the steel wire stay cord 16 that corresponds, steel wire stay cord 16 and motor box swing joint, all be connected with same control switch through screw fixed connection on four winding motor, be connected with positive and negative switch on the servo motor 17, four winding motor are synchronous machine, winding motor drives the rolling wheel and rotates and carry out the rolling to steel wire stay cord 16, it goes up and down to drive operation panel 8 through four steel wire stay cords 16.
In the embodiment, when the device is used, the device is moved to a proper position through the universal wheel 2, the universal wheel 2 is provided with the brake pad, the universal wheel 2 can be fixed, electrical equipment is powered on, the positive and negative switches and the control switch are arranged at positions convenient to control, the positions can be adjusted, a worker moves to the top of the operating plate 8, the servo motor 17 is started, the servo motor 17 drives the transverse round rod 18 to rotate, the transverse round rod 18 drives the two threaded rods 13 to rotate through the two diagonal sleeves 19, the threaded rods 13 drive the other threaded rod 13 to rotate through the corresponding two chain wheels and the corresponding chain 20, the four threaded rods 13 rotate simultaneously, the rotating directions of the four threaded rods 13 are the same, the four threaded rods 13 drive the lifting struts 5 to move upwards, the four lifting struts 5 drive the operating plate 8 to move upwards, the four motors are started simultaneously, and the steel wire pull rope 16 is wound through the winding, make operation panel 8 upward movement on four lift pillars 5, can further improve operation panel 8's height, shelter from sunshine through sunshading board 10, cool down the staff through cooling structure 11, can carry out the electric power maintenance, reverse start servo motor 17, make four lift pillars 5 downstream, make operation panel 8 downstream, reverse start four rolling motors, make four steel wire stay cords 16 relax, operation panel 8 downstream under the action of gravity, all structures in this application all can carry out the selection of material and length according to the in-service use condition, the drawing is the schematic structure picture, suitable adjustment can be made to specific actual dimensions.
The above descriptions are only preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the scope of the present invention, and the technical solutions and the utility model concepts of the present invention are equivalent to, replaced or changed.
Claims (6)
1. A lifting device for power equipment comprises a fixed box (1), wherein four universal wheels (2) are arranged at the bottom of the fixed box (1), and is characterized in that four support columns (3) are fixedly installed at the top of the fixed box (1), notch grooves (4) with open tops are formed in the inner sides of the four support columns (3), lifting support columns (5) are installed in the four notch grooves (4) in a sliding mode, the same operation plate (8) is installed in the inner sides of the four lifting support columns (5) in a sliding mode, two sun-shading and heat-dissipating structures are fixedly installed at the tops of the operation plates (8), four threaded rods (13) are vertically and rotatably installed on the fixed box (1), threaded grooves (12) are formed in the bottoms of the four lifting support columns (5), the four threaded rods (13) are respectively in threaded connection with the four threaded grooves (12), and a driving mechanism is arranged in the fixed box (, the four threaded rods (13) are all matched with the driving mechanism.
2. The lifting device for the power equipment as claimed in claim 1, wherein a winding structure (15) is fixedly mounted on the outer side of each of the four supporting columns (3), one end of a steel wire pulling rope (16) is connected to each of the four winding structures (15), the other end of each of the four steel wire pulling ropes (16) is fixedly connected to the top of the operating plate (8), two guide wheels (14) are arranged on the top of each of the four lifting supporting columns (5), and the steel wire pulling rope (16) is slidably connected with the corresponding two guide wheels (14).
3. The lifting device for power equipment is characterized in that the sun-shading and heat-dissipating structure comprises two sun-shading support rods (9), a sun-shading plate (10) and a temperature-reducing structure (11), wherein the two sun-shading support rods (9) are both fixedly provided with the top of the operating plate (8), the sun-shading plate (10) is fixedly provided on the top ends of the two sun-shading support rods (9), the temperature-reducing structure (11) is arranged at the bottom of the sun-shading plate (10), the temperature-reducing structure (11) comprises a heat-dissipating motor, a heat-dissipating fan and a dust screen, the heat-dissipating fan is fixedly provided on an output shaft of the heat-dissipating motor, and the dust screen is fixedly provided at the bottom of the sun-shading plate (10).
4. The lifting device for power equipment is characterized in that the driving mechanism comprises a servo motor (17), a transverse round rod (18), two diagonal sleeves (19), four chain wheels and two chains (20), wherein the four chain wheels are respectively fixedly sleeved on the outer sides of the four threaded rods (13), the chains (20) are meshed on the outer sides of the corresponding two chain wheels, the servo motor (17) is fixedly connected in the fixed box (1), the transverse round rod (18) is rotatably installed on the inner wall of the bottom of the fixed box (1), the two diagonal sleeves (19) are sleeved on the outer sides of the transverse round rod (18), and the two diagonal sleeves (19) are meshed with the two threaded rods (13) in the four threaded rods (13).
5. The lifting device for the power equipment according to claim 1, wherein guide grooves (6) are formed in the inner sides of the four lifting pillars (5), guide blocks (7) are slidably mounted in the four guide grooves (6), the four guide blocks (7) are fixedly mounted on the operating plate (8), limiting grooves (21) are formed in the two sides of the four lifting pillars (5), limiting bars (22) are fixedly mounted on the inner walls of the two sides of the four notch grooves (4), and the limiting bars (22) are slidably connected with the corresponding limiting grooves (21).
6. The lifting device for power equipment according to claim 2, wherein the winding structure (15) comprises a motor box, a winding motor and a winding wheel, the motor box is fixedly connected to the outer side of the support column (3), the winding motor is fixedly connected to the motor box, the winding wheel is fixedly mounted to an output shaft of the winding motor, the winding wheel is fixedly connected to a corresponding steel wire pull rope (16), the steel wire pull rope (16) is movably connected to the motor box, the four winding motors are all fixedly connected to the same control switch, a positive switch and a negative switch are connected to the servo motor (17), and the four winding motors are synchronous motors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020745830.8U CN213475335U (en) | 2020-05-08 | 2020-05-08 | Lifting device for power equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020745830.8U CN213475335U (en) | 2020-05-08 | 2020-05-08 | Lifting device for power equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213475335U true CN213475335U (en) | 2021-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020745830.8U Active CN213475335U (en) | 2020-05-08 | 2020-05-08 | Lifting device for power equipment |
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| Country | Link |
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| CN (1) | CN213475335U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111510A (en) * | 2022-06-23 | 2022-09-27 | 国家能源集团宁夏煤业有限责任公司 | Underground rescue emergency communication system |
-
2020
- 2020-05-08 CN CN202020745830.8U patent/CN213475335U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111510A (en) * | 2022-06-23 | 2022-09-27 | 国家能源集团宁夏煤业有限责任公司 | Underground rescue emergency communication system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211223 Address after: 030021 room 2510, 25 / F, block C, qingkong innovation base, No. 529, South Central Street, Taiyuan Xuefu Park, Shanxi comprehensive reform demonstration zone, Taiyuan City, Shanxi Province Patentee after: Shanxi Weinan Technology Co.,Ltd. Address before: 236200 No.80 jiangyueji, jiangyuecun, jiangdianzi Town, Yingshang County, Fuyang City, Anhui Province Patentee before: Jiang Hongling |
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| TR01 | Transfer of patent right |