TW201630770A - Stroller connecting apparatus - Google Patents

Abstract

This stroller connecting apparatus is provided with: a front portion connecting member connecting the front legs of two strollers to each other; a rear portion connecting member connecting the rear legs of the two strollers to each other; an upper portion connecting member connecting the hand-push frames of the two strollers to each other; a first link member having one end fixed to the front portion connecting member; a second link member having one end fixed to the rear portion connection member and the other end rotatably coupled to the other end of the first link member; a third link member having one end rotatably coupled to each of the other ends of the first link member and the second link member; and a fourth link member having one end rotatably coupled to the other end of the third link member and the other end fixed to the upper portion connecting member. The stroller connecting apparatus can firmly connect the two strollers, and can be switched from an unfolded state to a folded state.

Description

Stroller connection device

The present invention relates to a stroller coupling device for connecting two strollers in a laterally aligned manner.

Previously, as a stroller for twins, there were two types of infants arranged horizontally, or two infants arranged in a row. The twins are fitted with a baby carriage in a one-piece body with two baby seats. Therefore, even in the case of a baby riding, it is impossible to separate only one person.

Moreover, in the case of, for example, a baby who is one year old, the baby stroller purchased for the first baby and the baby stroller purchased for the second baby can be connected as needed, such as a twin stroller. It is convenient to use.

However, in order to connect two baby strollers for one person, it is necessary to sufficiently ensure the strength of the joint. In addition, in the state in which two baby strollers for one person are connected, it is desirable to facilitate the storage from the unfolded state to the folded state when not in use.

The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a stroller coupling device that can firmly connect two baby strollers and can switch two baby strollers in a connected state from a deployed state to a folded state.

In order to solve the above problems, a first aspect of the present invention is a baby carriage coupling device. It is used to connect two baby carriages in a horizontally aligned manner; and is characterized in that it comprises: a front connecting member for connecting the front legs of the two strollers to each other; and a rear connecting member for the above two sets The baby stroller is connected to each other; the upper connecting member is for connecting the cart racks of the two strollers to each other; the first link member has one end fixed to the front connecting member; and the second link member The other end of the first link member is rotatably connected to one end of the rear connecting member and rotatably connected to the other end of the first link member. The third link member is rotatably coupled to the first link member. And one end of each of the other ends of the second link member; and the fourth link member is rotatably connected to one end of the other end of the third link member and fixed to the other end of the upper connecting member .

According to a second aspect of the present invention, in the state of being attached to the stroller, the first link member, the second link member, and the third link are viewed from a lateral direction. The central joint portion to which the other end of the lever member is rotatably connected is substantially coincident with a joint portion that rotatably connects the upper ends of the front leg and the rear leg of the stroller.

According to a third aspect of the present invention, in the first aspect or the second aspect, the third link member and the fourth link member are rotatably rotated from a lateral direction when mounted on the stroller. The upper joint portion is connected to the joint portion, and the joint portion of the stroller frame is rotatably connected to the joint portion of the stroller frame.

According to a fourth aspect of the invention, the first link member, the second link member, the third link member, and the fourth link member are the first link member At least one of the members is formed with an article storage portion.

According to a fifth aspect of the present invention, in the aspect of the first to fourth aspect, the front left and right ends of the front connecting member are provided with a front portion fixedly releasably coupled to the front legs of the two strollers And the rear leg rear retainer releasably connected to the two strollers at the left and right ends of the rear connecting member; and connected to the upper portion The left and right ends of the member are provided with the above-mentioned trolley frame upper holder releasably connected to the above two strollers.

A sixth aspect of the present invention is the fifth aspect, wherein at least one of the front leg, the rear leg, and the cart frame of the stroller has a non-circular cross-sectional shape, and the front retainer and the rear portion At least one of the holder and the upper holder has a fixing surface that matches the non-circular cross-sectional shape.

According to a seventh aspect of the present invention, in the aspect of the first to sixth aspect, the device for pulling the first link member and the third link member to the second link member side is folded When switching to the unfolded state of the device when the stroller is in the unfolded state, the rotation between the first link member and the third link member is restricted in such a manner that the device is in the deployed state. Restrict the institution.

According to the present invention, it is possible to provide a stroller connecting device that can firmly connect two strollers and can switch two strollers in a connected state from a deployed state to a folded state.

1‧‧‧Baby stroller

2‧‧‧Front connection members

3‧‧‧After connecting members

4‧‧‧Upper connecting member

5‧‧‧1st link member

6‧‧‧2nd link member

7‧‧‧3rd link member

8‧‧‧4th link member

9‧‧‧Central axis of rotation

10‧‧‧Upper axis of rotation

11‧‧‧ Central Joint Department

12‧‧‧ upper joint

13‧‧‧Rotation limiting mechanism

14‧‧‧Article Storage Department

15‧‧‧Front holder

16‧‧‧ Rear Holder

17‧‧‧Upper holder

18‧‧‧Open and close

19‧‧‧ buckle film

20‧‧‧Blocks on the side of the buckle

21‧‧‧The joint on the side of the connecting member

30‧‧‧Retainer, stroller connection device

31‧‧‧Retainer

32‧‧‧fixer

33‧‧‧Retainer

34‧‧‧Retainer

35‧‧‧Retainer

36‧‧‧Retainer

50‧‧‧ baby carriage

51‧‧‧ body

52‧‧‧ seats

53‧‧‧ Cover

54‧‧‧ basket

55‧‧‧ Frame Department

56‧‧‧ front wheel

57‧‧‧ Rear wheel

58‧‧‧Front foot

59‧‧‧ hind feet

60‧‧‧Handrails

61‧‧‧Truck rack

62‧‧‧

63‧‧‧ rear cross member

64‧‧‧Foot installation

65‧‧‧Support

66‧‧‧Handlebar

66a‧‧‧Bend

66b‧‧‧Upper part

66c‧‧‧ Lower part

67‧‧‧Handle

68‧‧‧Upper bracket

69‧‧‧Upper sales

70‧‧‧Front linkage rod (front linkage member)

71‧‧‧ Rear linkage lever (rear linkage member)

72‧‧‧ lower sales

73‧‧‧Front link pin

74‧‧‧Backlinks

75‧‧‧ lower bracket

76‧‧‧Opening and closing mechanism

Fig. 1 is a perspective view showing a stroller coupling device according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a state in which the stroller coupling device shown in Fig. 1 is attached to a stroller (only a part of which is shown) in an unfolded state.

Fig. 3 is a perspective view showing a state in which the stroller coupling device shown in Fig. 1 is attached to a stroller (only a part of which is shown) in a folded state.

Fig. 4 is a front view showing a state in which two baby carriages are laterally aligned by a stroller coupling device shown in Fig. 1.

Fig. 5 is a perspective view showing the link structure of the stroller coupling device shown in Fig. 1 in an unfolded state.

Figure 6 is a view showing the link structure of the stroller coupling device shown in Figure 1 in an unfolded state. Side view.

Fig. 7 is a side view showing the link structure of the stroller coupling device shown in Fig. 1 in a folded state.

Fig. 8 is a view for explaining the configuration of a holder of the stroller coupling device shown in Fig. 1.

Fig. 9 is a side view showing the link structure in a state in which the stroller coupling device shown in Fig. 1 is attached to the stroller in an unfolded state.

Fig. 10 is a side view showing the link structure in a state in which the stroller coupling device shown in Fig. 1 is attached to the stroller in a folded state.

Fig. 11 is a perspective view showing a stroller coupling device according to another embodiment of the present invention.

Fig. 12 is a side view of the stroller coupling device shown in Fig. 11.

Fig. 13 is a perspective view showing the stroller coupling device shown in Fig. 11 in a folded state.

Fig. 14 is a perspective view showing a state in which the stroller coupling device shown in Fig. 11 is attached to a stroller (only a part is displayed) in an unfolded state.

Fig. 15 is a perspective view showing a state in which the stroller coupling device shown in Fig. 11 is attached to a stroller (only a part of which is shown) in a folded state.

Fig. 16 is a perspective view showing an example of a stroller connected using the stroller connecting device shown in Figs. 1 and 11 .

Fig. 17 is a perspective view showing the structure of the body of the stroller shown in Fig. 16.

Fig. 18 is a side view showing the link structure of the stroller shown in Fig. 16 in an unfolded state.

Fig. 19 is a side view showing the link structure of the stroller shown in Fig. 16 in a folded state.

Fig. 20 is a view showing another example of the holder of the stroller coupling device.

Fig. 21 is a view showing another example of the holder of the stroller coupling device.

Fig. 22 is a view showing another example of the holder of the stroller coupling device.

Fig. 23 is a view showing another example of the holder of the stroller coupling device.

Fig. 24 is a view showing another example of the holder of the stroller coupling device.

Fig. 25 is a view showing another example of the holder of the stroller coupling device.

Fig. 26 is a view showing another example of the holder of the stroller coupling device.

Hereinafter, a stroller coupling device according to an embodiment of the present invention will be described with reference to the drawings.

First, an example of a stroller in which two sets of baby carriages connected in the horizontal direction are connected will be described with reference to Figs. 16 to 19 .

In addition, the stroller connected by the stroller coupling device of the present embodiment can be in the unfolded state (in use) shown by the link structure in FIG. 18 and in the folded state (in storage) in the link structure in FIG. Change between. Hereinafter, the configuration of the stroller will be described centering on the unfolded state.

As shown in FIG. 16, the stroller 50 includes a vehicle body 51, a seat 52 supported by the vehicle body 51, a cover 53 disposed above the seat 52, and a basket 54 disposed below the seat 52.

As shown in FIG. 17, the vehicle body 51 includes a frame portion 55, and the front frame 56 and the rear wheel 57 are movably supported by the frame portion 55. The frame portion 55 constitutes a part of the frame structure of the vehicle body 51. That is, the frame portion 55 includes a pair of forefoot members 58 disposed on both sides of the stroller 50 (the vehicle body 51) in the left-right direction (width direction); a pair of rear legs 59 and a pair of armrests 60; and a single cart frame 61, It is disposed so as to connect the right and left handrails 60; the step portion 62 that connects the lower portion of the front left and right front legs 58 to each other; and the lower cross member 63 that connects the lower portions of the left and right rear legs 59 to each other. The front wheel 56 is disposed at the lower end of the front leg 58, and the rear leg 57 is disposed at the lower end of the rear leg 59.

On one side in the left-right direction of the vehicle body 51, the upper end portion of each of the front leg 58 and the rear leg 59 and the leg attachment portion 64 at the lower end of the armrest 60 are rotatably coupled to each other via the fulcrum pin 65. The other side of the body 51 is also the same.

The cart frame 61 includes: a pair of left and right handlebars 66; and a grip bar 67 extending to join the upper portions of the handlebars 66. Each of the handlebars 66 has a shape in which the two portions of the upper rod portion 66b and the lower rod portion 66c are distinguishable by the curved portion 66a in the middle. However, the upper rod portion 66b and the lower rod portion 66c are integrally formed by bending a single metal pipe.

The upper bracket 68 is mounted to be immovable via the rivet at the lower stem portion 66c. The upper bracket 68 is attached to the upper end of the armrest 60 via the upper pin 69. Thereby, the armrest 60 and the handlebar 66 of the cart frame 61 are rotatably supported by the upper pin 69 as a fulcrum.

Further, at the lower end of the lever portion 66c below the handlebar 66, the front interlocking lever (front interlocking member) 70 rear end portion and the rear interlocking lever (rear interlocking member) 71 front end are rotatably coupled via the lower pin 72. unit. The front end portion of the front interlocking lever 70 is rotatably coupled to the front leg 58 via the front connecting pin 73. The rear end link 71 has a rear end portion that is rotatably coupled to the rear leg 59 via the rear joint pin 74.

Further, a lower bracket 75 is fixed to the rear leg 59. When the stroller 50 is in the unfolded state, the lower end of the handlebar 66 abuts against the lower bracket 75, and is received by the rear leg 59 in the up and down direction. An opening and closing lock mechanism 76 for restricting the stroller 50 to the unfolded state and the folded state is provided around the lower pin 72. In addition, the lower bracket 75 may also be integrally formed with the rear leg 59.

The front leg 58, the rear leg 59, the armrest 60, the handlebar 66, the front interlocking lever 70, and the rear interlocking lever 71 are respectively formed on the right and left sides of the frame portion 55 of the vehicle body 51 to form a link mechanism. The composition of the left and right link mechanisms is the same. The opening and closing lock mechanism 76 releases the restriction of the vehicle body 51, and the components of the link mechanism are rotated around the joint point of the link mechanism, whereby the stroller 50 can be changed between the unfolded state and the folded state.

When the stroller 50 in the unfolded state is viewed from the left-right direction of the vehicle body 51, the lever portion 66b, the armrest 60, and the forefoot 58 of the handlebar 66 are arranged in a straight line.

Next, the stroller coupling device of the present embodiment will be described with reference to the drawings.

As shown in FIG. 1 to FIG. 3, the stroller coupling device 1 of the present embodiment includes a front connecting member 2 for connecting the front legs 58 of the two strollers 50, and a front connecting member 2 for placing two strollers 50. 59. The rear connecting member 3 is connected to each other; and the cart frame 61 for connecting the two strollers 50 to the upper connecting member 4 is connected to each other. The front connecting member 2, the rear connecting member 3, and the upper connecting member 4 are substantially rod-shaped members that extend in the left-right direction and have a common length.

The stroller coupling device 1 further includes a first link member 5, a second link member 6, and a third link member 7 for connecting the front connecting member 2, the rear connecting member 3, and the upper connecting member 4 to each other. And the fourth link member 8.

One end of the first link member 5 is fixed to the center portion of the front connecting member 2 in the left-right direction, and one end of the second link member 6 is fixed to the center portion of the rear connecting member 3 in the left-right direction. The other end of the first link member 5 is rotatable about a central rotation axis 9 extending in the left-right direction, and is connected to the other end of the second link member 6.

One end of the third link member 7 is rotatably connected to the other end of each of the first link member 5 and the second link member 6 about the central rotation axis 9 . One end of the fourth link member 8 is connected to the other end of the third link member 7 so as to be rotatable about the upper rotation axis 10 in the left-right direction. The other end of the fourth link member 8 is fixed to the center portion of the upper connecting member 4 in the left-right direction.

As shown in FIG. 4, the stroller coupling device 1 of the present embodiment connects the side faces of the two strollers 50 arranged side by side.

The baby carriage coupling device 1 having the above-described configuration includes the central joint portion 11 and the upper joint portion 12 as shown in FIGS. 5 to 7 , and the first to fourth link members 5 to 8 are wound around the joint portions 11 and 12 . Rotation allows the device to be switched between the device deployment state (Fig. 6) and the device collapse state (Fig. 7).

As shown in FIG. 1 to FIG. 3, in the stroller coupling device 1, when the device is folded to the device deployment state, the first link member 5 and the third link member 7 are provided. The rotation restricting mechanism 13 whose angle is restricted in the unfolded state of the device. In other words, the rotation restricting mechanism 13 restricts the first link in the unfolded state of the apparatus shown in FIG. 1 by bringing the front end portion of the third link member 7 into contact with the front surface of the first link member 5. The member 5 and the third link member 7 are configured to rotate relative to each other.

The third link member 7 is formed with an article storage portion 14 that functions as a cup holder or a storage case. The article storage unit 14 is formed to be in a posture in which an article can be placed in an unfolded state. Further, the formation portion of the article storage portion 14 is not limited to the third link member 7 , and the article storage portion 14 may be formed in the first link member 5 , the second link member 6 , or the fourth link member 8 .

As shown in FIGS. 1 to 3, the left and right ends of the front connecting member 2 of the stroller coupling device 1 are provided with a front holder 15 that is releasably connected to the front legs 58 of the two strollers 50. Similarly, at the left and right ends of the rear connecting member 3, a rear retainer 16 for the foot 59 is releasably connected to the two strollers 50. Further, at the left and right ends of the upper connecting member 4, the upper holder 17 of the handlebar 66 releasably connected to the two strollers 50 is provided.

As shown in FIG. 8, the front leg 58, the rear leg 59, and the handlebar 66 of the stroller 50 each have a non-circular cross-sectional shape, and each of the front holder 15, the rear holder 16, and the upper holder 17 There is a fixed surface that conforms to the non-circular cross-sectional shape of each of the front leg 58, the rear leg 59, and the handlebar 66 of the stroller 50.

Each of the front holder 15, the rear holder 16, and the upper holder 17 has an opening and closing piece 18 that is rotatably connected to the front connecting member 2, the rear connecting member 3, and the rear connecting member 4 at one end. At the other end of the opening and closing piece 18, one end of the locking piece 19 is rotatably connected. A projection 20 having a tapered surface is formed on the inner surface of the end portion of the front end portion of the fastening piece 19. The tapered surface of the projection 20 engages with the tapered surface of the projection 21 formed on the side of the coupling members 2, 3, and 4. The projections 20 on the sides of the holders 15, 16, and 17 and the projections 21 on the side of the coupling members 2, 3, and 4 are slid by the two tapered surfaces to press and fix the projections 20 and 21 together.

As described above, the baby carriage coupling device 1 front holder 15, the rear holder 16, and the upper holder 17 are fixed to the front foot 58 and the rear leg 59 of the stroller 50 by the fixing surface of the non-circular cross section. The rotation of the handlebars 66, the front anchors 15, the rear anchors 16, and the upper retainers 17 of the stroller coupling device 1 about the respective longitudinal axes of the forefoot 58, the rear leg 59, and the handlebar 66 are limited. Therefore, the two strollers 50 can be firmly coupled by the stroller coupling device 1.

As shown in FIG. 9 and FIG. 10, the stroller coupling device 1 of the present embodiment is attached to the stroller 50, and the first link member 5 and the second link member 6 are viewed from the lateral direction. The central joint portion 11 that is rotatably connected to each other end of the third link member 7 substantially coincides with the joint portion that rotatably connects the upper ends of the front leg 58 and the rear leg 59 of the stroller 50.

In the state in which the baby carriage coupling device 1 of the present embodiment is attached to the stroller 50, the third link member 7 and the fourth link member 8 are rotatably connected to the upper joint portion when viewed from the lateral direction. 12, which substantially coincides with the joint portion of the armrest 60 of the stroller 50 that is rotatably coupled to the handlebar 66.

Further, the stroller coupling device 1 of the present embodiment is attached to the stroller 50, and the first link member 5, the second link member 6, and the third link member 7 are respectively viewed from the lateral direction. The baby's front foot 58, the rear foot 59, and the armrest 60 substantially coincide with each other. In the unfolded state, the first link member 5 and the third link member 7 are substantially linear as a whole.

As described above, since the center joint portion 11 and the upper joint portion 12 of the stroller coupling device 1 substantially coincide with the joint portions of the stroller 50 when viewed from the lateral direction, the unfolded state shown in Fig. 9 is shown. When the folding state shown in FIG. 10 is switched, the shape of the stroller coupling device 1 changes in accordance with the change in the shape of the stroller 50. Therefore, at the time of the folding operation, it is not necessary to apply an extra force to the stroller coupling device 1, and a smooth folding operation can be realized.

In addition, the rotation axes 9, 10 of the joint portions 11, 12 of the stroller coupling device 1 do not have to completely coincide with the rotation axes of the joint portions of the stroller 50, even if the two axes of rotation are slightly different. Therefore, folding operations are also possible.

As described above, according to the stroller coupling device 1 of the present embodiment, the stroller coupling device 1 in which a plurality of components are integrated can connect the two strollers in a lateral direction and firmly connect them.

Moreover, since the stroller coupling device 1 is integrally formed, the fixing position of each of the holders 15, 16, and 17 relative to the stroller 50 can be automatically determined, so that erroneous assembly can be prevented.

Further, by fitting the joint portions 11 and 12 of the stroller coupling device 1 to the joint portions of the stroller 50, the two strollers 50 in the connected state can be smoothly switched from the unfolded state to the folded state.

Moreover, when each of the strollers 50 is used individually, it is possible to easily use the holders 15 , 16 , and 17 of the stroller coupling device 1 in a simple manner.

Moreover, since the article storage unit 14 is provided by the stroller coupling device 1, the added value can be improved.

Next, a stroller coupling device according to another embodiment of the present invention will be described with reference to Figs. 11 to 15 . In addition, in FIGS. 11 to 15, members having the same functions as those of the above-described embodiment shown in FIG. 1 are denoted by the same reference numerals.

The stroller coupling device 30 of the present embodiment has a link structure common to the stroller coupling device 1 shown in FIG. 1 . However, the third link member 7 is not provided with the article storage portion, and the fourth connection is provided. The length dimension of the rod member 8 is set to be large in size.

That is, in the stroller coupling device 30 of the present embodiment, as shown in FIGS. 11 to 13, the third link member 7 has a shape similar to the armrest 60 of the stroller 50 (see FIG. 16). Therefore, as shown in FIGS. 14 and 15, the degree of design up-conversion can be improved between the armrest 60 of the stroller 50 and the third link structure 7 of the stroller coupling device 30.

Further, in the stroller coupling device 30 of the present embodiment, since the length of the fourth link member 8 is set to be large, the handlebar 66 of the stroller 50 can be used as shown in Figs. 14 and 15 . Improved design up-and-down between the fourth link member 8 of the stroller attachment device 30 The extent of it.

The other operational effects of the stroller coupling device 30 of the present embodiment can obtain the same operational effects as the stroller coupling device 1 shown in Fig. 1 .

Further, in the present invention, the holder for fixing the stroller coupling device to the stroller is not limited to the above-described structure, and various holders can be used.

Figures 20 through 26 are examples of several such fixtures. For example, as shown in Fig. 20, a holder 30 having a surface fastener can be used. Further, as shown in Fig. 21, a holder 31 having an attachment structure that is detachably attached and detached by a member may be used. Further, as shown in Fig. 22, a holder 32 having a hinge structure and screwed may be used. Further, as shown in Fig. 23, a holder 33 having a latch can also be used. Further, as shown in Fig. 24, a holder 34 having a ratchet structure may be used. Further, as shown in Fig. 25, a holder 35 that is fixed by the adsorption force of the magnet may be used. Further, as shown in Fig. 26, a holder 36 having a slide mechanism can also be used.

1‧‧‧Baby stroller

2‧‧‧Front connection members

3‧‧‧After connecting members

4‧‧‧Upper connecting member

5‧‧‧1st link member

6‧‧‧2nd link member

7‧‧‧3rd link member

8‧‧‧4th link member

9‧‧‧Central axis of rotation

10‧‧‧Upper axis of rotation

13‧‧‧Rotation limiting mechanism

14‧‧‧Article Storage Department

15‧‧‧Front holder

16‧‧‧ Rear Holder

17‧‧‧Upper holder

Claims (7)

A stroller coupling device for connecting two strollers laterally in a row, and comprising: a front connecting member for coupling the front legs of the two strollers to each other; and a rear connecting member for The rear legs of the two strollers are coupled to each other; an upper connecting member for connecting the cart racks of the two strollers to each other; and a first link member having one end fixed to the front connecting member; a link member having one end fixed to one end of the rear connecting member and rotatably connected to the other end of the first link member; and a third link member rotatably connected to the first end One end of each of the other end of the link member and the second link member; and a fourth link member rotatably connected to one end of the other end of the third link member and fixed to the upper connecting member The other end. The baby carriage coupling device according to claim 1, wherein each of the first link member, the second link member, and the third link member is viewed from a lateral direction while being attached to the stroller. The central joint portion that is rotatably connected to the other end substantially coincides with the joint portion that rotatably connects the upper ends of the front leg and the rear leg of the stroller. The baby carriage coupling device according to claim 1 or 2, wherein the third link member and the fourth link member are rotatably coupled to the upper joint portion when viewed from a lateral direction in a state of being attached to the stroller And the joint portion of the stroller frame is rotatably connected to the armrest of the stroller. The baby carriage coupling device according to claim 1 or 2, wherein the first link member, the second link member, the third link member, and the fourth link member are One of them has an article storage unit. The stroller coupling device of claim 1 or 2, wherein the front and rear front anchors releasably coupled to the two strollers are disposed at left and right ends of the front connecting member; and the rear connecting member is The left and right ends are provided with the rear leg rear retainer releasably coupled to the two strollers; and the left and right ends of the upper connecting member are provided with the above-mentioned trolleys releasably connected to the two strollers The upper holder of the frame. The stroller coupling device of claim 5, wherein at least one of the front leg, the rear leg, and the cart frame of the stroller has a non-circular cross-sectional shape; and the front retainer, the rear retainer, And at least one of the upper holders has a fixing surface that matches the non-circular cross-sectional shape. The stroller coupling device according to claim 1 or 2, wherein the device is pulled from the first link member and the third link member to the second link member side, and is switched to be in an unfolded state. In the unfolded state of the above-described stroller, the rotation restricting mechanism is provided such that the angle between the first link member and the third link member is restricted in the unfolded state of the device.