CN207428732U - A kind of full-automatic table tennis table device - Google Patents

Abstract

The utility model discloses a kind of full-automatic table tennis table devices, and rotation axis is internally provided with including the first supporting rack, the first supporting rack, and rotation axis is connected with sliding block, and connecting rod is connected on sliding block, and connecting rod is hinged cabinet, cabinet inside installation motor；Motor drives multiple gears；Gear arrangement has transmission mechanism；It supports platform device top and court is set, swivel link is connected with transmission shaft, and transmission shaft is connected with online axis etc..The utility model can be used in indoor office room and gymnasium, and sporter can adjust the height of table tennis table according to itself height；During without using the present apparatus, it can erect automatically and solve the disadvantage that indoor table tennis table floor space is excessive；Net can move up and down and can automatically take in net cabinet；The device can move freely position and solve the disadvantage that table tennis table movement is difficult.

Description

A kind of full-automatic table tennis table device

Technical field

The utility model is related to sports equipment technical fields, and in particular to a kind of full-automatic table tennis table device.

Background technology

Table tennis is one of simple and extremely welcome sports, and the sports or amusement of table tennis are required for Using to table tennis table.Table tennis table is the old-fashioned table tennis table instrument of table tennis, and table top (can be advised the world by any material Surely should be by solid timber) it makes, there is certain elasticity, for upper surface playing surface, table top parallel with horizontal plane is dark-coloured (state Border match regulation should be by dark blackish green cellulose lacquer or japanning), matt, edge of table respectively has 2 centimetres of wide white lines, long title side Line, short title end line.There is the white line of 3 mm wides in table top center, claims center line, and two taiwan areas are respectively divided into two portions in left and right Point.

At present, common table tennis table in the market is typically all that height is fixed, position movement is difficult and court does not have Placement cannot be erect by having during use.Height is not freely adjustable in the market, can move freely position and can be erected when being not used Stand up the table tennis table device put.Common table tennis table height is fixed, and it is suitable that sporter can not possibly select according to itself height Highly take exercise；In addition, table tennis table volume is big, position movement is difficult, and table tennis table device must be dismantled when mobile；Finally, table tennis Pang billiard table when not in use, is typically placed in situ, taken up an area greatly, so be may result in average family and is not desired to purchase table tennis Platform.Therefore, the present apparatus solves three above deficiency：First, child's height is low, can suitably reduce table tennis table before the use Face；Second, during without using table tennis table, placement can be erect automatically, accomplishes not take up an area；3rd, it, can be first when moveable table of table tennis Automatic erect is placed, then is moved to any position by universal wheel.

Utility model content

The purpose of this utility model is to provide a kind of full-automatic table tennis table devices.

To achieve these goals, the technical solution of the utility model is as follows：

A kind of full-automatic table tennis table device, be provided with including the first supporting rack, on the downside of the first supporting rack the first universal wheel, Second universal wheel, the 3rd universal wheel and the 4th universal wheel, the first supporting rack are internally provided with the 3rd rotation axis and the 4th rotation axis, 4th rotation axis is welded respectively with the second connecting shaft part and the 3rd connecting shaft part, and the second connecting shaft part top is provided with the first connecting shaft part, the One connecting shaft part and the second connecting shaft part are hinged on the 5th bolt and the 5th nut, and the 3rd rotation axis is connected with the first sliding block and the 3rd and slides Block, the first sliding block and the 3rd sliding block are connected to first connecting rod and second connecting rod, first connecting rod and second connecting rod upper articulation There is the first cabinet, the first cabinet inside has the first motor and the second motor, and the first motor and the second motor are connected to first Gear set and second gear group, first gear group and second gear group are connected to the 3rd transmission shaft and the 4th transmission shaft, the Three transmission shafts and the 4th transmission shaft are connected to the 5th sliding block and the 6th sliding block, and the first cabinet is connected with the first online axis, the One online axis connection has the first transmission shaft, and the first transmission shaft is connected with the first swivel link, the first swivel link and the 3rd rotation Axis welds, and the 3rd rotation axis is connected with the first support platform device, and the first support platform device top sets the first court, the first table tennis Table top is hinged on the 5th sliding block and the 6th sliding block, and the first table tennis table left side of face is provided with net babinet, and net box house is set The 5th motor is equipped with, the 5th motor is connected with the 3rd swivel link, and the 3rd swivel link is connected with net, and the both sides of net are set There are a first fixed network frame and the second fixed network frame, be provided with the second court on the left of net babinet, under the second court Portion is provided with the second support platform device, and the second support platform device is connected with the 4th rotation axis, and the 4th rotation axis is welded with the second swivel link, the Two swivel links are connected with second driving shaft, and second driving shaft is connected with the second online axis, and the second online axis is provided with the second machine Case, the second cabinet inside have the 3rd motor and the 4th motor, the 3rd motor and the 4th motor be connected to the 3rd gear set and 4th gear set, the 3rd gear set and the 4th gear set are connected to the 5th transmission shaft and the 6th transmission shaft, the 5th transmission shaft The 7th sliding block and the 8th sliding block are connected to the 6th transmission shaft, the second cabinet is connected with third connecting rod and fourth link, the Three-link and fourth link are connected with the second sliding block and Four-slider, and the second sliding block and Four-slider are connected with the first rotation axis, First rotation axis lower part is provided with the second rotation axis, and the second rotation axis is welded respectively with the first joining beam part and tetrad rod piece, the Tetrad rod piece and the 3rd connecting shaft part are hinged on the 6th bolt and the 6th nut, and the second supporting rack is provided on the left of the 6th bolt, the Two supporting rack lower parts are provided with the 5th universal wheel, the 6th universal wheel, the 7th universal wheel and the 8th universal wheel.

One of one optimal enforcement scheme of the utility model, for the ease of movement, preferably in the first supporting rack and second Supporting rack lower part is respectively arranged with 4 universal wheels.

It is respectively arranged with inside one of one optimal enforcement scheme of the utility model, the first supporting rack and the second supporting rack 2 rotation axis.

One of one optimal enforcement scheme of the utility model, the first rotation axis is provided with the second sliding block and Four-slider.

One of one optimal enforcement scheme of the utility model, the second rotation axis are provided with the first connecting shaft part and the 4th connecting shaft Part.

One of one optimal enforcement scheme of the utility model, the first cabinet left side are provided with net babinet.

One of one optimal enforcement scheme of the utility model, the first cabinet and the second cabinet inside are respectively arranged with first Support platform device and the second support platform device.

One of one optimal enforcement scheme of the utility model, the first cabinet inside is respectively arranged with the first motor, second Motor, first gear group, second gear group, the 3rd transmission case, the 4th transmission shaft, the 5th sliding block and the 6th sliding block.

One of one optimal enforcement scheme of the utility model, the second cabinet inside is respectively arranged with the 3rd motor, the 4th Motor, the 3rd gear set, the 4th gear set, the 5th transmission shaft, the 6th transmission shaft, the 7th sliding block and the 8th sliding block.

One of one optimal enforcement scheme of the utility model, the 5th sliding block and the 6th sliding block are respectively hinged at the first table tennis The playing surface of the table, the 7th sliding block and the 8th sliding block are respectively hinged at the second court.

One of one optimal enforcement scheme of the utility model, net box house are provided with the 5th motor and the 3rd rotation Connecting rod.

One of one optimal enforcement scheme of the utility model, the electric control system of the device is Programmable logical controller Device PLC is realized.

To sum up, the utility model has the following advantages：

The utility model device can be used in indoor office room and gymnasium, and sporter can be according to itself height tune Save the height of table tennis table；When not in use, table tennis table can be erect automatically solves indoor table tennis table floor space to the device The shortcomings that excessive；Net can move up and down and can automatically take in net cabinet；The device can move freely position and solve The shortcomings that table tennis table movement is difficult.

Description of the drawings

Fig. 1 is the stereogram of device in the utility model one embodiment；

Fig. 2 is the elevating mechanism stereogram that the utility model one embodiment includes the first rotation axis and the 3rd sliding block；

Fig. 3 is that the utility model one embodiment includes the second rotation axis and the moving mechanism of the 4th rotation axis is three-dimensional Figure；

Fig. 4 is that the utility model one embodiment includes the first support platform device and the extension means of the second support platform device are three-dimensional Figure；

Fig. 5 is the drive mechanism connection figure of the first cabinet and the second cabinet in the utility model one embodiment；

Fig. 6 is the schematic diagram of the net babinet in the utility model one embodiment；

Fig. 7 is the front view of device in the utility model one embodiment；

Fig. 8 is the side view of device in the utility model one embodiment；

Fig. 9 is the top view of device in the utility model one embodiment；

Figure 10 is the stereogram of net babinet in the utility model one embodiment.

The reference numeral of the utility model is as follows：

First universal wheel；2nd, the second universal wheel；3rd, the first supporting rack；4th, the 3rd universal wheel；5th, the 4th universal wheel；6th, first Connecting rod；7th, second connecting rod；8th, the first cabinet；9th, the first online axis；10th, the first transmission shaft；11st, the first swivel link；12nd, first Support platform device；13rd, the first court；14th, net babinet；15th, the second court；16th, the second support platform device；17th, second Swivel link；18th, second driving shaft；19th, the second online axis；20th, the first rotation axis；21st, the second rotation axis；22nd, the second support Frame；23rd, the 5th universal wheel；24th, the 6th universal wheel；25th, the 3rd rotation axis；26th, the 4th rotation axis；27th, the 7th universal wheel；28、 8th universal wheel；29th, the first sliding block；30th, the second sliding block；31st, the first bolt；32nd, the first nut；33rd, the second bolt；34th, Two nuts；35th, third connecting rod；36th, the 3rd sliding block；37th, Four-slider；38th, the 3rd bolt；39th, the 4th bolt；40th, the 4th connects Bar；41st, the 3rd nut；42nd, the 4th nut；43rd, the 5th bolt；44th, the first connecting shaft part；45th, the second connecting shaft part；46th, the 5th spiral shell It is female；47th, the 6th nut；48th, the 3rd connecting shaft part；49th, the 4th connecting shaft part；50th, the 6th bolt；51st, the 7th bolt；52nd, the 7th spiral shell It is female；53rd, the 3rd rotation axis；54th, the second cabinet；55th, the 4th rotation axis；56th, the 8th nut；57th, the 8th bolt；58th, the first electricity Machine；59th, first gear group；60th, the 3rd transmission shaft；61st, the 5th sliding block；62nd, the second motor；63rd, second gear group；64th, the 4th Transmission shaft；65th, the 6th sliding block；66th, the 3rd motor；67th, the 3rd gear set；68th, the 5th transmission shaft；69th, the 7th sliding block；70th, Eight sliding blocks；71st, the 6th transmission shaft；72nd, the 4th gear set；73rd, the 4th motor；74th, the first fixed network frame；75th, net；76th, the 9th Nut；77th, the 9th bolt；78th, the 3rd swivel link；79th, the 5th motor；80th, the second fixed network frame.

Specific embodiment

Such as Fig. 1~full-automatic table tennis table device shown in Fig. 10, including the first supporting rack 3,3 downside of the first supporting rack is set The first universal wheel 1, the second universal wheel 2, the 3rd universal wheel 4 and the 4th universal wheel 5 are equipped with, the first supporting rack 3 is internally provided with Three rotation axis 25 and the 4th rotation axis 26, the 4th rotation axis 26 are welded respectively with the second connecting shaft part 45 and the 3rd connecting shaft part 48.The Two connecting shaft parts, 45 top is provided with the first connecting shaft part 44, and the first connecting shaft part 44 and the second connecting shaft part 45 are hinged on 43 He of the 5th bolt 5th nut 46.

3rd rotation axis 25 is connected with the first sliding block 29 and the 3rd sliding block 30, and the first sliding block 29 and the 3rd sliding block 30 connect respectively It is connected to first connecting rod 6 and second connecting rod 7, first connecting rod 6 and 7 upper articulation of second connecting rod have the first cabinet 8, in the first cabinet 8 There are the first motor 58 and the second motor 62 in portion.First motor 58 and the second motor 62 are connected to first gear group 59 and second Gear set 63, first gear group 59 and second gear group 63 are connected to the 3rd transmission shaft 60 and the 4th transmission shaft 64.

3rd transmission shaft 60 and the 4th transmission shaft 64 are connected to the 5th sliding block 61 and the 6th sliding block 65, the first cabinet 8 The first online axis 9 is connected with, the first online axis 9 is connected with the first transmission shaft 10, and the first transmission shaft 10 is connected with the first rotation company Bar 11, the first swivel link 11 are welded with the 3rd rotation axis 25, and the 3rd rotation axis 25 is connected with the first support platform device 12, the first support 12 top of platform device sets the first court 13, and the first court 13 is hinged on the 5th sliding block 61 and the 6th sliding block 65.

First court, 13 left side is provided with net babinet 14, and net babinet 14 is internally provided with the 5th motor 79, 5th motor 79 is connected with the 3rd swivel link 78, and the 3rd swivel link 78 is connected with net 75, and the both sides of net 75 are provided with First fixed network frame 74 and the second fixed network frame 80.

14 left side of net babinet is provided with the second court 15, and the lower part of the second court 15 is provided with second Platform device 16 is supportted, the second support platform device 16 is connected with the 4th rotation axis 55, and the 4th rotation axis 55 is welded with the second swivel link 17.The Two swivel links 17 are connected with second driving shaft 18, and second driving shaft 18 is connected with the second online axis 19, and the second online axis 19 is set The second cabinet 54 is equipped with, has the 3rd motor 66 and the 4th motor 73 inside the second cabinet 54.3rd motor 66 and the 4th motor 73 The 3rd gear set 67 and the 4th gear set 72 are connected to, the 3rd gear set 67 and the 4th gear set 72 are connected to the 5th 68 and the 6th transmission shaft 71 of transmission shaft, the 5th transmission shaft 68 and the 6th transmission shaft 71 are connected to the 7th sliding block 69 and the 8th Sliding block 80.

Second cabinet 54 is connected with third connecting rod 35 and fourth link 40, and third connecting rod 35 and fourth link 40 are connected with Two sliding blocks 30 and Four-slider 37.Second sliding block 30 and Four-slider 37 are connected with the first rotation axis 20, under the first rotation axis 20 Portion is provided with the second rotation axis 21, and the second rotation axis 21 is welded respectively with the first joining beam part 44 and tetrad rod piece 49.Tetrad 49 and the 3rd connecting shaft part 48 of rod piece is hinged on the 6th bolt 50 and the 6th nut 47, and 50 left side of the 6th bolt is provided with second Support 22,22 lower part of the second supporting rack are provided with the 5th universal wheel 23, the 6th universal wheel 24, the 7th universal wheel 27 and the 80000th To wheel 28.

In the specific implementation, sporter slowly turns the utility model device clockwise simultaneously according to oneself height, motor Dynamic first rotation axis 20 and the 3rd rotation axis 53, the first sliding block 29 are moved to the left, and the 3rd sliding block 36 moves right, due to the first rotation The left and right helical pitch of shaft 20 is all identical, so the distance that the first sliding block 29 is moved to the left is equal to what the 3rd sliding block 36 moved right Distance.First sliding block 29 drives second connecting rod 7 to rotate clockwise, and the 3rd sliding block 36 drives first connecting rod 6 to rotate counterclockwise, due to The equal distance to move right of distance being moved to the left, so the angle that first connecting rod 6 rotates counterclockwise is suitable equal to second connecting rod 7 The angle that hour hands rotate.First connecting rod 6 and second connecting rod 7, which rotate, drives the first cabinet 8 to remain that horizontal raises, the first machine Case 8 drives the first court 13 to remain that horizontal raises.Similarly, the 3rd rotation axis 53 rotates clockwise drive second 54 horizontal of cabinet raises the height of the second court 15.Similarly, slowly rotation can drive the to motor counterclockwise One cabinet 8 and 54 horizontal of the second cabinet reduce the height of the first court 13 and the second court 15.When not making With during table tennis table, it is necessary to which court is accepted.First, start motor and rotate clockwise and drive the first cabinet 8 and the Two cabinets 54 rise to highest point, while start the first motor 58, the second motor 62, the 3rd motor 66, the 4th motor 73, and first 58 and second motor 62 of motor driving first gear group 59 and second gear group 63, first gear group 59 and second gear group 63 are divided Not Qu Dong the 3rd transmission shaft 60 and the 4th transmission shaft 64 extend, the 3rd transmission shaft 60 and the 4th transmission shaft 64 respectively drive the 5th cunning 61 and the 6th sliding block 65 of block moves forward, and it is most right that the 5th sliding block 61 and the 6th sliding block 65 drive the first court 13 to be moved to Side.Similarly, the 3rd motor 66 and the 4th motor 73 drive the second court 15 to be moved to Far Left.Then, electricity is restarted Machine, which rotates clockwise, drives the first transmission shaft 10 and second driving shaft 18 to work, and motor drives the first transmission shaft 10 to shorten, and first Rotation axis 53 drives the first swivel link 11 to rotate clockwise, and the first swivel link 11 welds together with the 3rd rotation axis 53, 3rd rotation axis 53, which rotates clockwise, drives the first eyelid retractor 12 to rotate clockwise, and the first eyelid retractor 12 drives the first table tennis Table top 13 rotates clockwise, the motor stalls after the first court 13 is disposed vertically.Similarly, motor rotates clockwise Also second driving shaft 18 can be driven to be disposed vertically the second court 15.Finally, 5th motor 79 of startup clockwise, the 5th Motor 79 drives the 3rd swivel link 78 to rotate clockwise, so as to drive the first fixed network frame 74 and the second fixed network frame 80 in net case It is moved down in two cavitys of body 14, two fixed network framves, which move down, will drive net 75 to move down.Similarly, when making During with table tennis table device, first, starting the 5th motor 79, rotation drives net 75 to move up counterclockwise, and then, motor is inverse Hour hands rotation drives the first transmission shaft 10 and second driving shaft 18 by 18 water of the first court 13 and the second court Placing flat, finally, startup motor, which rotates clockwise, drives the first cabinet 8 and the second cabinet 54 to be down to calibrated altitude 760mm.As general When table tennis table device is moved to other places, it is possible to be moved by 8 universal wheels of 22 lower part of the first supporting rack 3 and the second supporting rack It is dynamic.First supporting rack 3 and the second supporting rack 22 are internally provided with the second rotation axis 21 and the 4th rotation axis 26, the second rotation axis 21 weld together with the first connecting shaft part 44 and the 4th connecting shaft part 49, the 4th rotation axis 26 and the second connecting shaft part 45 and the 3rd connecting shaft Part 48 welds together, and four connecting shaft parts are by the 5th bolt 43, the 5th nut 46, the 6th bolt 50, the 6th nut 47 by two A independent left and right table tennis table device links together.The electric control system of the device is to pass through programmable logic controller (PLC) PLC is realized.

Although being described in detail with reference to attached drawing to specific embodiment of the present utility model, should not be construed as pair The restriction of the protection domain of this patent.In the described scope of claims, those skilled in the art are without creative labor The dynamic various modifications that can be made and deformation still belong to the protection domain of this patent.

Claims (10)

1. a kind of full-automatic table tennis table device, it is characterised in that：Including the first supporting rack（3）, first supporting rack（3）Under Side is provided with the first universal wheel（1）, the second universal wheel（2）, the 3rd universal wheel（4）With the 4th universal wheel（5）, first support Frame（3）It is internally provided with the 3rd rotation axis（25）With the 4th rotation axis（26）, the 4th rotation axis（26）Connect respectively with second Shaft member（45）With the 3rd connecting shaft part（48）Welding, the second connecting shaft part（45）Top is provided with the first connecting shaft part（44）, it is described First connecting shaft part（44）With the second connecting shaft part（45）It is hinged on the 5th bolt（43）With the 5th nut（46）, the 3rd rotation axis （25）It is connected with the first sliding block（29）With the 3rd sliding block（30）, first sliding block（29）With the 3rd sliding block（30）It is connected to First connecting rod（6）And second connecting rod（7）, the first connecting rod（6）And second connecting rod（7）Upper articulation has the first cabinet（8）, institute State the first cabinet（8）There is the first motor in inside（58）With the second motor（62）, first motor（58）With the second motor（62） It is connected to first gear group（59）With second gear group（63）, the first gear group（59）With second gear group（63）Point The 3rd transmission shaft is not connected with（60）With the 4th transmission shaft（64）, the 3rd transmission shaft（60）With the 4th transmission shaft（64）Respectively It is connected with the 5th sliding block（61）With the 6th sliding block（65）, first cabinet（8）It is connected with the first online axis（9）, described first Online axis（9）It is connected with the first transmission shaft（10）, first transmission shaft（10）It is connected with the first swivel link（11）, described One swivel link（11）With the 3rd rotation axis（25）Welding, the 3rd rotation axis（25）It is connected with the first support platform device（12）, institute State the first support platform device（12）Top sets the first court（13）, first court（13）It is hinged on the 5th cunning Block（61）With the 6th sliding block（65）, first court（13）Left side is provided with net babinet（14）, the net case Body（14）It is internally provided with the 5th motor（79）, the 5th motor（79）It is connected with the 3rd swivel link（78）, the described 3rd Swivel link（78）It is connected with net（75）, the net（75）Both sides be provided with the first fixed network frame（74）With the second fixed network frame （80）, the net babinet（14）Left side is provided with the second court（15）, second court（15）Under Portion is provided with the second support platform device（16）, the second support platform device（16）It is connected with the 4th rotation axis（55）, the 4th rotation axis （55）With the second swivel link（17）Welding, second swivel link（17）It is connected with second driving shaft（18）, described second Transmission shaft（18）It is connected with the second online axis（19）, the second online axis（19）It is provided with the second cabinet（54）, described second Cabinet（54）There is the 3rd motor in inside（66）With the 4th motor（73）, the 3rd motor（66）With the 4th motor（73）Connect respectively It is connected to the 3rd gear set（67）With the 4th gear set（72）, the 3rd gear set（67）With the 4th gear set（72）It connects respectively There is the 5th transmission shaft（68）With the 6th transmission shaft（71）, the 5th transmission shaft（68）With the 6th transmission shaft（71）It is connected to 7th sliding block（69）With the 8th sliding block（70）, second cabinet（54）It is connected with third connecting rod（35）And fourth link（40）, The third connecting rod（35）And fourth link（40）It is connected with the second sliding block（30）With Four-slider（37）, second sliding block （30）With Four-slider（37）It is connected with the first rotation axis（20）, first rotation axis（20）Lower part is provided with the second rotation axis （21）, second rotation axis（21）Respectively with the first coupling piece（44）With the 4th coupling piece（49）Welding, the 4th shaft coupling Part（49）With the 3rd connecting shaft part（48）It is hinged on the 6th bolt（50）With the 6th nut（47）, the 6th bolt（50）Left side is set It is equipped with the second supporting rack（22）, second supporting rack（22）Lower part is provided with the 5th universal wheel（23）, the 6th universal wheel（24）、 7th universal wheel（27）With the 8th universal wheel（28）.

2. full-automatic table tennis table device according to claim 1, it is characterised in that：First supporting rack（3）With Two supporting racks（22）Lower part is respectively arranged with 4 universal wheels.

3. full-automatic table tennis table device according to claim 1, it is characterised in that：First supporting rack（3）With Two supporting racks（22）Inside is respectively arranged with 2 rotation axis.

4. full-automatic table tennis table device according to claim 1, it is characterised in that：First rotation axis（20）It sets There is the second sliding block（30）With Four-slider（37）.

5. full-automatic table tennis table device according to claim 1, it is characterised in that：Second rotation axis（21）It sets There is the first connecting shaft part（44）With the 4th connecting shaft part（49）.

6. full-automatic table tennis table device according to claim 1, it is characterised in that：First cabinet（8）Left side is set It is equipped with net babinet（14）.

7. full-automatic table tennis table device according to claim 1, it is characterised in that：First cabinet（8）With second Cabinet（54）Inside is respectively arranged with the first support platform device（12）With the second support platform device（16）.

8. full-automatic table tennis table device according to claim 1, it is characterised in that：First cabinet（8）Inside points The first motor is not provided with（58）, the second motor（62）, first gear group（59）, second gear group（63）, the 3rd transmission shaft （60）, the 4th transmission shaft（64）, the 5th sliding block（61）With the 6th sliding block（65）.

9. full-automatic table tennis table device according to claim 1, it is characterised in that：Second cabinet（54）Inside points The 3rd motor is not provided with（66）, the 4th motor（73）, the 3rd gear set（67）, the 4th gear set（72）, the 5th transmission shaft （68）, the 6th transmission shaft（71）, the 7th sliding block（69）With the 8th sliding block（70）.

10. the full-automatic table tennis table device described in claim 1, it is characterised in that：5th sliding block（61）With Six sliding blocks（65）It is respectively hinged at the first court（13）, the 7th sliding block（69）With the 8th sliding block（70）It is respectively articulated with In the second court（15）；The net babinet（14）It is internally provided with the 5th motor（79）With the 3rd swivel link （78）.