CN207316000U - A kind of rack and pinion engagement device - Google Patents
A kind of rack and pinion engagement device Download PDFInfo
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- CN207316000U CN207316000U CN201721157075.6U CN201721157075U CN207316000U CN 207316000 U CN207316000 U CN 207316000U CN 201721157075 U CN201721157075 U CN 201721157075U CN 207316000 U CN207316000 U CN 207316000U
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- pedestal
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Abstract
The utility model provides a kind of rack and pinion engagement device.The device includes：Screw rod, one end of the screw rod is fixed on perpendicular, the other end of the screw rod sequentially passes through the centre bore of block and the centre bore of flexible member, the flexible member is placed between the block and nut, the telescopic direction of the flexible member is parallel with the screw rod, and the nut coordinates with the screw rod, and the gear of rotation is equiped with the parallel plane of the screw rod, the gear is connected with the block, the wheel and rack engagement.The utility model is compressed by tightening nut flexible member, the elastic deformation produced by flexible member promotes block to move, ensure that wheel and rack can be engaged in the tooth position of back lash maximum, and wheel and rack is set to be in engagement all the time by the deformation of flexible member in transmission process, it need not adjust repeatedly, whole device is easy to operate, and is easily achieved.
Description
Technical field
Technical field of mechanical transmission is the utility model is related to, more particularly, to a kind of rack and pinion engagement device.
Background technology
Rack and pinion drive mechanism is extensive in various application in machine equipments, and the rotary motion of gear is changed into rack by it
Linear reciprocating motion, or the linear reciprocating motion of rack is changed into the rotary motion of gear.Rack and pinion drive mechanism is fitted
For heavy load, high accuracy, high rigidity, high speed, long stroke CNC toolroom machines, lathe, milling machine, woodworking machinery, machining center
With electroplating equipment wielding machine etc..
In rack-and-pinion installing process, and in whole transmission process, it should remain rack-and-pinion and tightly engage,
It can guarantee that stationarity, the accuracy of transmission.When rack length is very long, the error being installed on straightness of rack can be increasingly
Greatly, the Meshing stability of wheel and rack can thus be influenced.A kind of rack and pinion engagement device is currently, there are, passes through deceleration
Box body around hinge axis rotates, and gear is produced the rotary motion close to rack or remote rack around hinge axis, so as to adjust
Back lash between gear and rack, box body of speed reducer are fixed by the cooperation of nut and screw rod.
In above device, in order to ensure wheel and rack engagement stability, it is necessary to constantly manual locking and unclamp spiral shell
Mother adjusts the back lash of gear and rack, and the whole process that adjusts is cumbersome, is not easy to operate.
Utility model content
The utility model provides a kind of rack-and-pinion for overcoming the above problem or solving the above problems at least in part and nibbles
Attach together and put.
A kind of rack and pinion engagement device, including：Screw rod, one end of the screw rod are fixed on perpendicular, the spiral shell
The other end of bar sequentially passes through the centre bore of block and the centre bore of flexible member, and the flexible member is placed in the block and spiral shell
Between mother, the telescopic direction of the flexible member is parallel with the screw rod, and the nut coordinates with the screw rod, in the screw rod
The gear of rotation is equiped with parallel plane, the gear is connected with the block, the wheel and rack engagement.
Preferably, described device further includes：First pedestal, first pedestal are equipped with and can be slidably connected on its surface
Reducer pedestal, the glide direction of the reducer pedestal is parallel with the screw rod, and the block is installed on the reducer pedestal,
Gear reducer is equiped with the reducer pedestal, the gear is connected by gear reducer and reducer pedestal with the block.
Preferably, the gear is coaxially installed in the shaft end of the gear reducer, and is rotated around the shaft end of the gear reducer, institute
Rack level is stated to be installed in the plane vertical with the reducer pedestal glide direction.
Preferably, described device further comprises：Second pedestal, second pedestal is vertical with first pedestal, institute
Screw rod is stated tightly to lock on second pedestal.
Preferably, described be slidably connected connects for sliding-rail sliding, including：First pedestal is equipped with line slide rail, institute
It is parallel with the glide direction of the reducer pedestal to state line slide rail, is furnished with sliding block, the reducer pedestal dress on the line slide rail
It is located on the sliding block, is slided along the line slide rail.
Preferably, the line slide rail is two, and is arranged in parallel.
Preferably, two identical blocks, described two identical blocks places are symmetrically arranged with the reducer pedestal
Plane it is vertical with the glide direction of the gear reducer, the centre bores of described two identical blocks is respectively by two parallel arrangements
The screw rod pass through.
Preferably, the flexible member is butterfly spring.
Preferably, described be slidably connected further includes the connection of slide bar sliding sleeve, including：First pedestal is equipped with slide bar, institute
It is parallel with the glide direction of reducer pedestal to state slide bar, is furnished with sliding sleeve on the slide bar, the reducer pedestal is installed in the sliding sleeve
On, and can be along the sliding bar.
Preferably, second pedestal and the first pedestal integrated molding.
The utility model proposes a kind of rack and pinion engagement device, compressed by tightening nut flexible member, lead to
The elastic deformation for crossing flexible member generation promotes block movement, so as to drive gear on reducer pedestal and gear reducer to close
The direction movement of rack, ensures that wheel and rack can be engaged in the tooth position of back lash maximum, and the energy in transmission process
Enough wheel and rack is set to be in engagement all the time by the deformation of flexible member, it is not necessary to adjust repeatedly, whole device operation
It is convenient, and be easily achieved.
Brief description of the drawings
Fig. 1 is the structure diagram according to the rack and pinion engagement device of the utility model embodiment；
Fig. 2 is the front view according to Fig. 1 of the utility model embodiment；
Fig. 3 is the top view according to Fig. 1 of the utility model embodiment；
Wherein：
The second pedestals of 1-；2- line slide rails；3- racks；
4- sliding blocks；5- screw rods；6- nuts；
7- flexible members；8- reducer pedestals；9- gear reducers；
10- gears；11- blocks；The first pedestals of 12-.
Embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate the utility model, but is not intended to limit the scope of the present invention.
Fig. 1 is according to the structure diagram of the rack and pinion engagement device of the utility model embodiment, and Fig. 2 is according to this reality
With the front view of Fig. 1 of new embodiment, Fig. 3 is the top view according to Fig. 1 of the utility model embodiment.With reference to Fig. 1-3 institute
Show, a kind of rack and pinion engagement device includes：Screw rod 5, one end of the screw rod 5 are fixed on perpendicular, the screw rod 5
The other end sequentially passes through the centre bore of block 11 and the centre bore of flexible member 7, the flexible member 7 be placed in the block 11 with
Between nut 6, the telescopic direction of the flexible member 7 is parallel with the screw rod 5, and the nut 6 coordinates with the screw rod 5,
The gear 10 of rotation is equiped with the parallel plane of the screw rod 5, the gear 10 is connected with the block 11, the gear 10
Engaged with rack 3.
Specifically, since rack 3 is long rack, its straightness in installation process it is difficult to ensure that, then gear 10 with
Rack 3 it is actual engaged transmission during, it is possible that a part of tooth in rack 3 engaged with gear 10 it is not close even
It is disengaged from the situation of state.For such case, it is necessary to adjust the back lash between rack 3 and gear 10, to ensure tooth
Bar 3 and gear 10 can be engaged in the position of back lash maximum.First, be installed, it is necessary to pass through initial stage in gear rack arrangement
Observed in transmission process and find the position in rack 3 with the tooth of 10 back lash of gear maximum.Then, by twisting clockwise
The dynamic nut 6 coordinated with screw rod 5, since flexible member 7 is placed between nut 6 and block 11, nut 6 extrudes flexible member 7, leads to
The elastic deformation for crossing the generation of flexible member 7 applies thrust to block 11, promotes block 11 to be moved on screw rod 5, due to block 11
It is connected with gear 10, so the promotion lower gear 10 and block 11 in flexible member 7 are mobile at the same time, and moves closer to rack 3.Most
Afterwards, when the tooth of rack 3 and 10 back lash of gear maximum is just at a fully engaged, stopping turns nut 6, so far complete mated gear
The adjustment of rack back lash.
Further, in the transmission process after the completion of adjustment, when rack 3 and smaller 10 back lash of gear, rack 3
Reaction force is produced to gear 10, due to the fixation of nut 6, which can increase the elastic deformation of flexible member 7
Greatly, it is unlikely to make the too tight of rack and pinion engagement and influence transmission；When rack 3 and larger 10 back lash of gear, elasticity member
The elastic deformation of part 7 reduces.By the meshing relation between the deformation adjust automatically rack 3 and gear 10 of flexible member 7, ensure
Adjustment rack 3 and gear 10 are in engagement all the time.If engaging tension and influencing to pass occur in transmission process in rack-and-pinion
During dynamic situation, by fine-tuning nut 6 counterclockwise, but it must ensure that the tooth position of rack meshing clearance maximum can nibble
Close, when specific operation process and excessive adjustment gear rack back lash is similar, is no longer described in detail herein.
The rack and pinion engagement device that above-described embodiment proposes, by turning nut clockwise and extruding flexible member, leads to
Cross flexible member and promote the gear movement being connected with block so that wheel and rack can be nibbled in the tooth position of back lash maximum
Close, and wheel and rack can be made to be in engagement all the time by the deformation of flexible member in transmission process, it is not necessary to
Adjust repeatedly, whole device is easy to operate, and is easily achieved.
Based on above-described embodiment, with reference to shown in Fig. 1-3, rack and pinion engagement device further includes：First pedestal 12, the first base
Seat 12 is equipped with the reducer pedestal 8 that can be slidably connected on its surface, and the glide direction of reducer pedestal 8 is parallel with the screw rod 5,
Block 11 is installed on reducer pedestal 8, and gear reducer 9 is equiped with reducer pedestal 8, and the gear passes through gear reducer 9 and gear reducer
Seat 8 is connected with the block 11.
Specifically, in order to realize the connection of block 11 and gear 10, it is necessary to which the surface set in the first pedestal 12 has and it
The reducer pedestal 8 being slidably connected, and reducer pedestal 8 can be slided along the direction parallel with screw rod 5, block 11 and gear reducer 9
All it is installed on reducer pedestal 8, when so turning nut 6 clockwise, thrust is applied to block 11 by flexible member 7, so that
Drive the gear 10 of 9 shaft end of reducer pedestal 8 and gear reducer to slide together, and finally engaged with rack 3.
The rack and pinion engagement device that above-described embodiment proposes, by the reducer pedestal being slidably connected on the first pedestal,
Block and reducer pedestal and the gear of reducer pedestal shaft end can be moved as a whole so that the displacement distance adjustment of gear
It is more convenient and accurate.
Based on above-described embodiment, with reference to shown in Fig. 1 and Fig. 2, the gear 10 is coaxially installed in the axis of the gear reducer 9
End, and rotated around the shaft end of gear reducer 9,3 level of rack is installed in the plane vertical with 8 glide direction of reducer pedestal
On.
Specifically, so can be large-scale by rotational movement since gear reducer 9 is used for reducing rotating speed and increase torque
The linear motion of mechanical part.Generally will with 3 meshed gears 10 of rack be installed on 9 output shaft of gear reducer shaft end, and with it is defeated
Shaft is coaxial, and is rotated around output shaft, ensure that the installation accuracy of gear 10.Certainly, can also work as in some occasion gear reducers 9
Speed increaser uses, and gear 10 at this time is just installed in the shaft end of 9 input shaft of gear reducer.Meanwhile in order to ensure the accuracy of mesh, rack
3 are horizontally arranged in the vertical plane of 8 glide direction of reducer pedestal, and such installation ensure that gear 10 with rack 3 is opposite
It is mobile, and gear 10 positive can be engaged with rack 3, improve transmission accuracy.
Based on above-described embodiment, as shown in Figure 1, rack and pinion engagement device further comprises the second pedestal 1, the second pedestal
1 is vertical with the first pedestal 12, and screw rod 5 is tightly locked on second pedestal 1.
Specifically, in order to preferably fix and facilitate dismantling screw 5, the second base is provided with rack and pinion engagement device
Seat 1, the second pedestal 1 is vertical with the first pedestal 12, is fixed on due to screw rod 5 in the plane vertical with the first pedestal 12, and screw rod 5
Threaded hole fixed lock vertical with the second pedestal 1, that screw rod 5 is equipped with by the second pedestal 1.Nut 6 is being turned clockwise
During, since screw rod 5 is fixed on the second pedestal 1, and screw rod 5 is parallel with the glide direction of reducer pedestal 9 and wears successively
The centre bore and flexible member 7 of block 11 are crossed, the pressure that nut 6 applies flexible member 7 causes block 11 to drive reducer pedestal
It is mobile, so as to adjust the back lash between gear 10 and rack 3.
The rack and pinion engagement device that above-described embodiment proposes, can easily mount and dismount screw rod, and cause screw rod
It can be firmly fixed on the second pedestal.
Based on the various embodiments described above, as shown in Figure 1, the reducer pedestal 8 on the first pedestal 12 the use that is slidably connected
Sliding-rail sliding connects, including：12 are equipped with line slide rail 2, the cunning of the line slide rail 2 and the reducer pedestal 8 on first pedestal
Dynamic direction is parallel, is furnished with sliding block 4 on the line slide rail 2, and the reducer pedestal 8 is installed on the sliding block 4, and can be along
The line slide rail 2 slides.
Specifically, in order to ensure that it is smooth that reducer pedestal 8 can slide on the first pedestal 12, the present embodiment selects slide to slide
The slip connection mode of block, is certainly not limited to this.Line slide rail 2 is equipped with the first pedestal 12, is furnished with line slide rail 2 and slides
Block 4, reducer pedestal 8 are installed on sliding block 4, gear reducer 9 and block 11 are equiped with reducer pedestal 8, the shaft end of gear reducer 9 is coaxial
Gear 10 is equiped with, and screw rod 5 is parallel with the glide direction of reducer pedestal 8 and sequentially passes through the centre bore and elasticity of block 11
Element 7, since flexible member 7 is placed between nut 6 and block 11.When turning nut 6 clockwise, by flexible member 7
Apply pressure so as to drive reducer pedestal 8 to be slided on line slide rail 2, ensure rack 10 and gear 3 in transmission process all the time
In engagement.
The rack and pinion engagement device that above-described embodiment proposes, by installing sliding-rail sliding device so that reducer pedestal exists
Slide smooth on slide, more easily adjust the back lash between gear and rack.
Based on the various embodiments described above, with reference to shown in Fig. 1 and Fig. 2, the line slide rail 2 is two, and is arranged in parallel.2
Sliding block 4 is respectively equipped with the line slide rail 2 of parallel arrangement, reducer pedestal 8 by being connected with the sliding block 4 on each line slide rail 2,
In order to make reducer pedestal 8 more steady, when reducer pedestal 8 is connected with sliding block 4, reducer pedestal 8 is being installed on two sliding blocks 4 just
Centre position, when turning nut 6 clockwise so that the slip of reducer pedestal 8 is more steady, so as to ensure rack 3 and gear
10 accuracy of mesh.
Based on the various embodiments described above, with reference to shown in Fig. 1 and Fig. 3, reducer pedestal 8 is symmetrically arranged with two identical blocks
11, the plane where two identical blocks 11 is vertical with the glide direction of gear reducer 8, the centre bore of two identical blocks 11
Passed through respectively by the screw rod 5 of two parallel arrangements.
Specifically, in order to ensure the uniform force for making flexible member 7 during adjusting nut 6, in reducer pedestal 8
Both sides are arranged symmetrically two blocks 11, while the centre bore of two blocks 11 is each passed through by two screw rods 5 being arranged in parallel
With two flexible members 7, each flexible member 7 is all placed between block 11 and nut 6, and the telescopic direction of flexible member 7 with
Screw rod 5 is parallel, and nut 6 has been respectively cooperating with each screw rod 5.When needing to adjust the back lash of rack 3 and gear 10, it is necessary to
Two nuts 6 are adjusted at the same time, and two nuts 6 make flexible member 7 produce deformation, on the one hand 8 application of reducer pedestal is pushed away respectively
The more uniform stabilization of power, on the other hand two flexible members 7 can bear rack 3 and gear 10 produces in transmission process
The reaction force of bigger.
As the preferred embodiment of the various embodiments described above, flexible member is butterfly spring.Due to rack and pinion engagement device one
As be used for large-scale close mechanical and be driven, therefore flexible member needs to bear larger deformation quantity.In the various embodiments described above, elasticity member
The preferred disk spring of part, disk spring are the washer type springs of the truncated cone tee section formed with metal blank or forging and stamping blank, its
It is big to be mainly characterized by load, stroke is short, and required space is small, is applied in combination convenient and to repair replacement cost low.In rack-and-pinion
In engagement process, the size of flexible member can be reduced using disk spring, disk spring just can by less deformation quantity
Reaction force of the rack to gear is carried, ensures that rack and pinion is in engagement all the time by the fixation of nut.
As alternative embodiment, as shown in Figure 1, being slidably connected on the first pedestal 12 of reducer pedestal 8 further includes slide bar
Sliding sleeve connects, including：First pedestal 12 is equipped with slide bar, and the slide bar is parallel with the glide direction of reducer pedestal 8, described
It is furnished with sliding sleeve on slide bar, the reducer pedestal 8 is installed on the sliding sleeve, along the sliding bar.
Specifically, slide bar is equipped with the first pedestal 12, is furnished with sliding sleeve on slide bar, reducer pedestal 8 is installed on sliding sleeve, subtracts
Gear reducer 9 and block 11 are equiped with fast engine base 8, the shaft end of gear reducer 9 is coaxially equiped with gear 10, and screw rod 5 is with slowing down
The glide direction of engine base 8 is parallel and sequentially passes through the centre bore of block 11 and flexible member 7, since flexible member 7 is placed in nut 6
Between block 11.When turning nut 6 clockwise, by applying pressure to flexible member 7 so as to drive reducer pedestal 8 in cunning
Slided on bar, ensure that rack 10 and gear 3 are in engagement all the time in transmission process.
The rack and pinion engagement device that above-described embodiment proposes, by installing slide bar slide block device so that reducer pedestal exists
Slide smooth on slide bar, more easily adjust the back lash between gear and rack.
As the preferred embodiment of above-described embodiment, as shown in Figure 1,12 integrated molding of the second pedestal 1 and the first pedestal.For
Simplify whole rack and pinion engagement device, and ensure the second pedestal 1 can it is vertical with the first pedestal 12 on the premise of, by two
For pedestal integrated molding into " L " type pedestal, this " L " type pedestal can make assembling more accurate, when tightening nut 5, so that
What guarantee rack 3 and gear 10 can engage more stablizes.
The utility model proposes a kind of rack and pinion engagement device, compressed by tightening nut flexible member, lead to
The elastic deformation for crossing flexible member generation promotes block, so as to drive the gear on gear reducer to move, ensures that wheel and rack exists
The tooth position of back lash maximum can engage, and can make wheel and rack by the deformation of flexible member in transmission process
All the time it is in engagement, it is not necessary to adjust repeatedly, whole device is easy to operate, and is easily achieved.
Finally, the device in the utility model is only preferable embodiment, is not intended to limit the guarantor of the utility model
Protect scope.Where within the spirit and principles of the present invention, any modification, equivalent replacement, improvement and so on, should all include
Within the scope of protection of the utility model.
Claims (10)
- A kind of 1. rack and pinion engagement device, it is characterised in that including：Screw rod, one end of the screw rod are fixed on perpendicular On, the other end of the screw rod sequentially passes through the centre bore of block and the centre bore of flexible member, and the flexible member is placed in institute To state between block and nut, the telescopic direction of the flexible member is parallel with the screw rod, and the nut coordinates with the screw rod, The gear of rotation is equiped with the parallel plane of the screw rod, the gear is connected with the block, the wheel and rack Engagement.
- 2. rack and pinion engagement device according to claim 1, it is characterised in that further include：First pedestal, described first Pedestal is equipped with the reducer pedestal that can be slidably connected on its surface, and the glide direction of the reducer pedestal is put down with the screw rod OK, the block is installed on the reducer pedestal, and gear reducer is equiped with the reducer pedestal, and the gear passes through gear reducer It is connected with reducer pedestal with the block.
- 3. rack and pinion engagement device according to claim 2, it is characterised in that the gear is coaxially installed in described subtract The shaft end of fast machine, and rotated around the shaft end of the gear reducer, the rack level is installed in and the reducer pedestal glide direction In vertical plane.
- 4. the rack and pinion engagement device according to Claims 2 or 3, it is characterised in that further comprise：Second pedestal, Second pedestal is vertical with first pedestal, and the screw rod is tightly locked on second pedestal.
- 5. rack and pinion engagement device according to claim 4, it is characterised in that described be slidably connected connects for sliding-rail sliding Connect, including：First pedestal is equipped with line slide rail, and the line slide rail is parallel with the glide direction of the reducer pedestal, It is furnished with sliding block on the line slide rail, the reducer pedestal is installed on the sliding block, is slided along the line slide rail.
- 6. rack and pinion engagement device according to claim 5, it is characterised in that the line slide rail is two, and flat Row arrangement.
- 7. rack and pinion engagement device according to claim 6, it is characterised in that be symmetrically arranged with the reducer pedestal Two identical blocks, the plane where described two identical blocks is vertical with the glide direction of the gear reducer, and described two The centre bore of a identical block is passed through by the screw rod of two parallel arrangements respectively.
- 8. the rack and pinion engagement device according to any one of claim 5-7, it is characterised in that the flexible member is Butterfly spring.
- 9. rack and pinion engagement device according to claim 4, it is characterised in that described be slidably connected further includes slide bar cunning Set connection, including：First pedestal is equipped with slide bar, and the slide bar is parallel with the glide direction of reducer pedestal, the slide bar Upper to be furnished with sliding sleeve, the reducer pedestal is installed on the sliding sleeve, and can be along the sliding bar.
- 10. rack and pinion engagement device according to claim 4, it is characterised in that second pedestal and described first Pedestal integrated molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721157075.6U CN207316000U (en) | 2017-09-11 | 2017-09-11 | A kind of rack and pinion engagement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721157075.6U CN207316000U (en) | 2017-09-11 | 2017-09-11 | A kind of rack and pinion engagement device |
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| Publication Number | Publication Date |
|---|---|
| CN207316000U true CN207316000U (en) | 2018-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721157075.6U Active CN207316000U (en) | 2017-09-11 | 2017-09-11 | A kind of rack and pinion engagement device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109262604A (en) * | 2018-10-05 | 2019-01-25 | 绍兴迪艾仕机械设计有限公司 | A kind of industrial robot with apparatus for adjusting gear backlash |
| CN109570860A (en) * | 2019-01-25 | 2019-04-05 | 上海中巽科技股份有限公司 | Ship frame Intelligent welding multi-axis robot welded rails |
| CN109882579A (en) * | 2019-04-08 | 2019-06-14 | 无锡市威博钟山科技有限公司 | A transmission locking device |
| CN115031015A (en) * | 2022-07-07 | 2022-09-09 | 一汽解放汽车有限公司 | Gear backlash adjusting device |
-
2017
- 2017-09-11 CN CN201721157075.6U patent/CN207316000U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109262604A (en) * | 2018-10-05 | 2019-01-25 | 绍兴迪艾仕机械设计有限公司 | A kind of industrial robot with apparatus for adjusting gear backlash |
| CN109262604B (en) * | 2018-10-05 | 2021-09-17 | 绍兴迪艾仕机械设计有限公司 | Industrial robot with gear backlash adjusting device |
| CN109570860A (en) * | 2019-01-25 | 2019-04-05 | 上海中巽科技股份有限公司 | Ship frame Intelligent welding multi-axis robot welded rails |
| CN109570860B (en) * | 2019-01-25 | 2021-01-15 | 上海中巽科技股份有限公司 | Multi-axis robot welding track for intelligent welding of ship frame |
| CN109882579A (en) * | 2019-04-08 | 2019-06-14 | 无锡市威博钟山科技有限公司 | A transmission locking device |
| CN115031015A (en) * | 2022-07-07 | 2022-09-09 | 一汽解放汽车有限公司 | Gear backlash adjusting device |
| CN115031015B (en) * | 2022-07-07 | 2024-05-28 | 一汽解放汽车有限公司 | Gear backlash adjusting device |
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