TWM519105U - Safety seat device installed on two-wheeled carrier - Google Patents

Description

Safety seat device mounted on a two-wheeled vehicle

The present invention relates to a trolley, and more particularly to a safety seat device mounted on a two-wheeled vehicle.

There is a bicycle carrying component (PCT Patent No. I453141) having a rack mountable to a bicycle frame, a carrier member mounted on the bracket, and a carrier member that can be secured relative to the carrier A unit that is combined or detached. Although the bicycle is mounted to the bicycle using such a carrier assembly, the bicycle can be brought to the point of carrying a child or other item, but the carrier assembly cannot be used for other purposes when the carrier assembly is detached from the bicycle. That is to say, the load bearing assembly can only function when mated with the bicycle.

Another bicycle child seat (TW Publication No. 399 553) is a telescopic handle, a base, a second wheel frame and a connecting seat mounted on a body, and the base can be combined with the connecting seat through the base On the frame of the bicycle and the rear carrier. Although the base is detached from the connecting seat, and the seat body is engaged with the telescopic handle, the base, and the wheel carriers, the function of using the trolley and the general seat can be generated, but the base and the connecting seat are The combination of the two inserts of the base must be inserted into the two insertion holes of the connecting seat, and then the two sets of the inserted sleeves are passed through the through-holes of the inserted pieces, and a snap fit is made. The column buckle is combined with a fastening hole, and the overall structure is complicated. The assembly and disassembly operations are difficult and time-consuming to operate, which is not practical.

Furthermore, the average infant stroller cannot be installed on a bicycle after it has been folded, causing the bicyclist to carry the young child to the destination without carrying the child's vehicle when walking. The use of the traditional bicycle safety seat is specific to the vehicle when the bicycle rider carries the young child, and the function is simple and the application is not good.

Therefore, the object of the present invention is to provide a safety seat device mounted on a two-wheeled vehicle that can be arbitrarily assembled and changed according to the needs of use.

Thus, the present invention is a safety seat device mounted on a two-wheeled vehicle having a rear luggage rack including a cart unit, a combined unit and a base unit. The cart unit has a positioning member, a front wheel frame group fixed to the positioning member, a handle group relative to the front wheel frame group, a link group pivotally connected between the front wheel frame group and the handle group, a rear wheel frame group coupled to the link group and a connection group pivotally connected between the front wheel frame group and the rear wheel frame group, the front wheel frame group having a pair of lower tops and a pair opposite to the same a top front roller having a pair of upper bottoms and a pair of upper tops opposite the upper bottoms, the rear wheel sets each having a rear roller, the handle set being operable to cause the handle set to be An unfolded state in which the front wheel carrier group is docked, and is operated in a folded state with respect to the front wheel carrier group. When the handle group is in an unfolded state, the upper bottom portions respectively abut the lower tops, and the same The rear roller is separated from the front rollers. When the handle set is in the folded state, the upper bottom is located between the lower top and the front rollers, and the rear rollers are inclined with respect to the front rollers. near. The binding unit is mounted on the positioning component of the trolley unit and has an embedded card set disposed at the bottom. The base unit can be mounted on the rear luggage rack of the two-wheeled vehicle, and has a fixing base, a locking group disposed on the fixing base and capable of being embedded by the embedded card group, and a mounting body mounted on the fixing base. a first quick release group that firmly connects the card group and the card group, the card group and the card group are concave and convex, and the first quick release group has a lever pivotally connected to the fixed seat The block, operating the wrench to rotate, can cause the card set to be indented or away from the card set.

The utility model has the following advantages: the modular concept is adopted, so that the foldable trolley unit can be mounted on the rear luggage rack of the bicycle, and the trolley unit can be used as a trolley alone or can be matched with a seat unit. Providing the safety of children riding bicycles can greatly enhance the functionality and market value of goods.

Referring to Figures 1 and 2, an embodiment of the present invention is a safety seat device mounted on a two-wheeled vehicle. The two-wheeled vehicle is a bicycle (see Figures 8, 12 and 13) and has a rear luggage rack 100. The cart device includes a cart unit 10, a combination unit 20, a base unit 30, and a seat unit 40.

The cart unit 10 has a long rod-shaped positioning member 11 , a front wheel frame set 12 fixed to the positioning member 11 , a handle set 13 relative to the front wheel frame set 12 , and a front wheel frame set A link set 14 between the handle set 13 and a rear wheel frame set 15 coupled to the link set 14 and a connection between the front wheel frame set 12 and the rear wheel set 15 Group 16.

As shown in FIG. 10, the positioning member 11 has an oblong cross-sectional shape.

The front wheel frame group 12 has a pair of front wheel frame bars 121 respectively fixed to the two ends of the positioning member 11 and a pair of front roller plates 122 respectively disposed at the bottom of the front wheel frame bars 121. The front wheel frame bars 121 have One is opposite to the lower top 123 of the front roller 122.

The handle set 13 has a pair of upper posts 131 and a handle bar 132 that is inverted U-shaped and connected to the top of the upper posts 131. Each of the upper posts 131 has an upper bottom 133 and a top and bottom 133 is opposite and connected to the upper top 134 of the handlebar 132.

The link set 14 has a pair of first links 141 pivotally connected between the upper post 131 of the handle set 13 and the front wheel post 121 of the front wheel set 12, and a pair of pivotal links respectively a second link 142 between the post 131 and the front wheel frame 121 and located on one side of the first link 141, and a pair of third links 143 respectively pivotally connected to the second links 142 And a pair of fourth links 144 pivotally connected to the third links 143 and a pair of fifth links 144 ′ respectively pivotally connected between the front wheel frame group 12 and the rear wheel frame group 15 , The fourth link 144 is pivotally connected to the rear wheel carrier group 15, respectively. The first link 141 has a first pivot portion 145 pivotally connected to the upper bottom portion 133 and a first pivot portion 145 opposite to the first pivot portion 145 and pivoted to the lower top portion 123 and the front roller The first pivoting portion 146 between 122. The second links 142 each have a second shaft pivot portion 147 pivotally connected to the upper bottom portion 133, and a second shaft pivot portion 147 opposite to the second shaft pivot portion 147 and pivoted to the lower top of the front wheel frame rods 121. a second pivoting portion 148 of the 123 and a pulling portion 149 disposed on the outer side of the second pivoting portion 128 opposite to the second pivoting portion 147, the pulling portion 149 and the third connecting rod 143 are pivotally connected to each other .

The rear wheel carrier set 15 has a pair of rear wheel frame bars 151, a pair of rear rollers 152 respectively disposed at the bottoms of the rear wheel frame bars 151, and a control rod 153 disposed through the rear wheel frame bars 151. The rear wheel frame bars 151 each have an elongated hole 154 (see FIG. 6) through which the control rod 153 is inserted.

Referring to Figure 6, the connection set 16 has a pair of connecting rods 161 each having a pair of apertures 162 that should be open at both ends of the lever 153 and laterally open.

The binding unit 20 is mounted on the positioning member 11 of the cart unit 10, and has a positioning base 21, a card assembly 22 disposed on the positioning base 21, and a locking bracket. A coupling seat 23 above the 21 and a second quick release group 24 mounted to the coupling seat 23. The positioning seat 21 has a first side portion 211 corresponding to the front roller 122, a second side portion 212 opposite to the first side portion 211, and a first side portion 211 disposed at the top portion and the first side portion 211. A groove 213 is formed between the second side portions 212, and the groove 213 is fitted to the positioning member 11. The embedded card set 22 is disposed at the bottom of the positioning base 21 and has a first inserting member 221 disposed on the first side portion 211 and having an inverted L shape, and a second side portion 212 disposed on the second side portion 212. The second insulative member 222 (with reference to FIG. 10 and FIG. 11). The joint 23 has a pair of coupling members 231 which are inverted L-shaped. The second quick release group 24 has a lock rod 241 that can pass through the joint member 231, an end member 242 that is locked to one end of the lock rod 241, and an shaft that is disposed at the other end of the lock rod 241 and can generate eccentricity. The tilting member 243.

With reference to FIG. 3, FIG. 9, FIG. 10 and FIG. 11, the base unit 30 can be mounted on the rear luggage rack 100 of the two-wheeled vehicle, and has a fixing base 31 disposed on the fixing base 31 and available for the The card set 32 of the embedded card set 22 and a first quick release set 33 mounted on the fixed seat 31 and capable of firmly joining the clamping set 32 and the embedded set 22 are provided. The card set 22 and the card set 32 are embossed, and the card set 32 has a pair of spaced apart first Ld members 321 and a swivel relative to the mount 31. The second fastening member 322 has a trigger block 331 pivotally connected to the fixing base 31 and a linkage block 332 pivotally connected between the trigger block 331 and the second clamping member 322. .

The seat unit 40 is detachably mounted to the coupling unit 20 and has a seat member 41 and an adjustably mounted on the seat member 41. Referring to FIG. 3, FIG. 9, FIG. 10 and FIG. a headrest member 42 , an adjustment group 43 mounted between the seat member 41 and the headrest member 42 , a fastener 44 disposed at the bottom of the seat member 41 and engageable with the coupling member 231 A cassette group 45 corresponding to the card firmware 44.

With reference to FIG. 4 and FIG. 5 , the adjustment group 43 has a body 46 fixed to the seat member 41 , and a sliding member 47 mounted on the headrest member 42 and slidable relative to the body 46 . A slider member 48 slidably mounted inside the slider 47 and an elastic member 49 that is elastically engaged between the slider 47 and the slider member 48. The main body 46 has a sliding groove 461 and a plurality of toothed grooves 462 which are connected to the sliding groove 461 and are spaced apart. The toothed grooves 462 are arranged in two rows. The sliding member 47 has a shell member 471 and a pair of flexible plates 472 which are elastically biased relative to the shell member 471. Each of the flexible plates 472 has an insert card that can be inserted relative to any of the toothed grooves 462. The block 473 and a stud 474 disposed on one side of the block 473. The slider member 48 has a long rod shape and has an operating end 481 and a pair of guiding portions 482 opposite to the operating end 481 and having an inclined groove shape. The protruding post 474 and the guiding portion 482 are nested with each other. . The elastic member 49 is a compression spring whose elastic force constantly causes the operating end 481 to be displaced toward the flexible plates 472. When the operating end 481 of the slider member 48 is operated, the guiding portions 482 can be The guide post 474 is guided to drive the blocks 473 away from the toothed grooves 462, and the elastic member 49 has a rebound elastic force. When the operating end 481 of the slider member 48 is released, the elastic member 49 is used back. The release force causes the blocks 473 to engage in jamming relative to the toothed grooves 462.

The fastening member 44 and the coupling seat 23 of the coupling unit 20 are embossed and have a pair of slots 441 which are oppositely disposed and can be nested by the coupling members 231. The cassette group 45 has a first latching member 451 disposed between the latching slots 441 and engageable with the first latching member 321 and a card engageable with the second latching member 322. Two card components 452. The fastener 44 can be firmly coupled to the coupling seat 23 by the second quick release group 24.

With the above components, the user can select different combinations according to the needs. For example, as shown in FIG. 8 and FIG. 9 , when the seat unit 40 is used in conjunction with a bicycle for carrying an infant, the base unit 30 can be pre-locked to the rear luggage rack 100 and the card of the seat unit 40 can be pre-locked. The first latching member 451 and the second latching member 452 of the stack 45 are respectively engaged by the first latching member 321 , and then the triggering block 331 of the first quick release group 33 is operated, and the linking block 332 is caused. The second clamping member 322 is changed from a remote position to a locking position relative to the second locking member 452, so that the seat unit 40 is fixed to the base unit 30 and the rear luggage rack 100. When the trigger block 331 of the first quick release group 33 is operated again, and the linkage block 332 is caused to move the second clamping member 322 from the buckle position to the remote position relative to the second latch member 452, the position can be easily The seat unit 40 is detached from the rear roof rack 100.

As shown in FIG. 10, FIG. 11 and FIG. 12, when the cart unit 10 and the seat unit 40 are to be used for carrying an infant, the base unit 30 may be pre-locked to the rear luggage rack. 100, and the binding unit 20 is also pre-locked to the positioning member 11 of the trolley unit 10, and the second quick release group 24 can be used to stably position the seat unit 40 on the coupling unit 20 (refer to FIG. 3). ). Then, the first card member 221 and the second card member 222 of the combining unit 20 are respectively nested in the first card member 321 (FIG. 10), and the first quick release group 33 is operated. The toggle block 331 is configured to cause the linkage member 322 to change from a remote position to a buckle position relative to the second engagement member 222, so that the trolley unit 10 is integrated. The seat unit 40 of the coupling unit 20 is fixed to the base unit 30 and the rear roof rack 100 (as shown in FIG. 11).

As shown in FIG. 13 , if the seat unit 40 is detached from the cart unit 10 , the positioning unit 20 that has been previously coupled to the cart unit 10 can also be positioned relative to the base unit 30 ( FIG. 13 ). Not shown in the drawings, and the cart unit 10 can be fixed to the rear and rear racks 100.

As shown in FIG. 1, FIG. 6, and FIG. 7, the cart unit 10 can be operated in a collapsed state by an unfolded state. When the cart unit 10 is in the unfolded state, and the operator pushes the control rod 153 to move downward along the elongate hole 154, the rear wheel frame group 15 can be pulled to swing relative to the front wheel frame group 12, and the The rear wheel frame group 15 pulls the link group 14 to enable the handle set 13 to be in an unfolded state in which the front wheel frame group 12 is docked, and is operated to be in a folded state with respect to the front wheel frame group 12, which is folded. When the handle set 13 is in the unfolded state, the upper bottom portions 133 are respectively abutted against the lower top portions 123, and the rear rollers 152 are generated away from the front rollers 122. When the handle group 13 is in the folded state, the same The upper bottom 133 is located between the lower top portion 123 and the front rollers 122, and the rear rollers 152 are brought closer to the front rollers 122.

As shown in FIG. 1, when the cart unit 10 is in the unfolded state, the seat unit 40 can be engaged to reach the infant stroller. As shown in FIGS. 7 and 13, the cart unit 10 can be reduced in size when in the folded state. Moreover, the unfolding and folding operation of the cart unit 10 is relatively easy, and the combination of the cart unit 10, the combining unit 20, the base unit 30 and the seat unit 40, the trolley device can be conveniently operated and is convenient for carrying the baby. Young children.

In addition, when the seat unit 40 is detached from the coupling seat 23 of the coupling unit 20, the seat unit 40 can be placed in a car as a safety seat. The combined structure of the cart unit 10 and the combining unit 20 is used as a foldable cart.

Therefore, the present invention utilizes the combination of the cart unit 10, the combining unit 20, and the base unit 30 and the seat unit 40, and has a wide range of uses, and can indeed achieve the object of the present invention.

It is worth mentioning that by using the slider member 48 of the adjustment group 43, the clamping position of the slider 47 relative to the body 46 can be removed, and the headrest member 42 can be produced relative to the seat member 41. The purpose of adjusting the height of the headrest member 42 can be achieved by lifting.

However, the above is only the embodiment of the present invention, and when it is not possible to limit the scope of the present invention, all the simple equivalent changes and modifications according to the scope of the patent application and the contents of the patent specification are still This new patent covers the scope.

100‧‧‧Luggage rack
10‧‧‧Truck unit
11‧‧‧ Positioning parts
12‧‧‧Front wheel set
121‧‧‧Front wheel rod
122‧‧‧Front wheel
123‧‧‧Lower top
13‧‧‧Hand group
131‧‧‧Upper post
132‧‧‧Handlebar
133‧‧‧Upper bottom
134‧‧‧上上
14‧‧‧ linkage group
141‧‧‧first link
142‧‧‧second link
143‧‧‧third link
144‧‧‧fourth link
144'‧‧‧ fifth link
145‧‧‧First Axis
146‧‧‧First pivoting
147‧‧‧Second axis pivot
148‧‧‧Second pivoting
149‧‧‧Traffic Department
15‧‧‧ Rear wheel set
151‧‧‧ Rear wheel rod
152‧‧‧Back wheel
153‧‧‧Control lever
154‧‧‧Long hole
16‧‧‧Connected group
161‧‧‧ Connecting rod
162‧‧‧Kakong
20‧‧‧ combination unit
21‧‧‧ Positioning Block
211‧‧‧ first side
212‧‧‧ second side
213‧‧‧ Groove
22‧‧‧Inlay Card Group
221‧‧‧First inset
222‧‧‧Second inset
23‧‧‧ joint
231‧‧‧Connected parts
24‧‧‧Second quick release group
241‧‧‧Lock lever
242‧‧‧End pieces
243‧‧‧掣动
30‧‧‧Base unit
31‧‧‧ fixed seat
32‧‧‧Card Group
321‧‧‧First card parts
322‧‧‧Second card parts
33‧‧‧First Quick Release Group
331‧‧‧ wrench
332‧‧‧ linkage block
40‧‧‧Seat unit
41‧‧‧Seat parts
42‧‧‧ head pillows
43‧‧‧Adjustment group
44‧‧‧ card firmware
441‧‧‧ card slot
45‧‧‧Carson Group
451‧‧‧ first card condition
452‧‧‧Second card condition
46‧‧‧Ontology
461‧‧ ‧ chute
462‧‧‧ toothed groove
47‧‧‧Sliding parts
471‧‧‧Shell
472‧‧‧Flexible board
473‧‧‧ card block
474‧‧‧Bump
48‧‧‧Sliding parts
481‧‧‧Operator
482‧‧‧Guidelines
49‧‧‧Flexible parts

Other features and advantages of the present invention will be apparent from the following description of the drawings. FIG. 1 is a perspective view of an embodiment of a safety seat device mounted on a two-wheeled vehicle; Figure 2 is an exploded perspective view of the embodiment; Figure 3 is a partially exploded perspective view of the embodiment of the embodiment; Figure 4 is an exploded perspective view of a seat unit of the embodiment; Incomplete cross-sectional view showing one seat member, one headrest member and an adjusting group of the seat unit; FIG. 6 is a schematic view of a folding portion of the embodiment, illustrating that a cart unit can be operated in an unfolded state. Figure 7 is a perspective view showing the folding of the cart unit of the embodiment; Figure 8 is a schematic view of the use of the embodiment, illustrating that the seat unit can be mounted to the rear luggage rack; Figure 9 is the implementation Another incomplete cross-sectional view showing that the seat unit is fixed to the rear luggage rack through a base unit; FIG. 10 is another schematic operation diagram of the embodiment, illustrating that the seat unit is coupled to the cart unit and Mounted on the rear luggage rack; Figure 11 is a view similar to Figure 10, illustrating the seat unit, the cart unit and mountable to the rear luggage rack; Figure 12 is another schematic view of the use of the embodiment, illustrating the provision of a seat The cart unit of the unit can be mounted to the rear stowage bin; and Figure 13 is a further schematic view of the use of the embodiment, illustrating that the cart unit can be separately mounted to the rear stowage bin.

10‧‧‧Truck unit

11‧‧‧ Positioning parts

12‧‧‧Front wheel set

121‧‧‧Front wheel rod

122‧‧‧Front wheel

123‧‧‧Lower top

13‧‧‧Hand group

131‧‧‧Upper post

148‧‧‧Second pivoting

149‧‧‧Traffic Department

15‧‧‧ Rear wheel set

151‧‧‧ Rear wheel rod

152‧‧‧Back wheel

153‧‧‧Control lever

16‧‧‧Connected group

161‧‧‧ Connecting rod

132‧‧‧Handlebar

133‧‧‧Upper bottom

134‧‧‧上上

14‧‧‧ linkage group

141‧‧‧first link

142‧‧‧second link

143‧‧‧third link

144‧‧‧fourth link

145‧‧‧First Axis

146‧‧‧First pivoting

147‧‧‧Second axis pivot

20‧‧‧ combination unit

30‧‧‧Base unit

40‧‧‧Seat unit

41‧‧‧Seat parts

42‧‧‧ head pillows

43‧‧‧Adjustment group

44‧‧‧ card firmware

46‧‧‧Ontology

47‧‧‧Sliding parts

48‧‧‧Sliding parts

49‧‧‧Flexible parts

Claims (9)

A safety seat device mounted on a two-wheeled vehicle, the two-wheeled vehicle having a rear luggage rack, the trolley device comprising: a trolley unit having a positioning member, a front wheel frame group fixed to the positioning member, and a a handle set relative to the front wheel frame set, a link set pivotally connected between the front wheel frame set and the handle set, a rear wheel frame set coupled to the link set, and a pivotal link to the front wheel frame a set of connections between the set and the rear wheel set, the front set of wheels having a pair of lower tops and a pair of front rollers opposite the lower tops, the handle sets having a pair of upper bottoms and a pair of uppers The upper top portion opposite to the bottom, the rear wheel carrier group each has a rear roller, and the operation of the linkage group enables the handle group to be in an unfolded state in which the front wheel carrier group is docked, and is operated to generate a receipt relative to the front wheel carrier group. In the folded state, when the handle set is in the unfolded state, the upper bottoms are respectively connected to the lower tops, and the rear rollers are generated away from the front rollers. When the handle set is in the folded state, the handle set is in the folded state. Waiting for the bottom to be at the top of the lower and the front Between the rollers, and the rear rollers are brought closer to the front rollers; a combined unit is mounted on the positioning component of the cart unit and has an embedded card set at the bottom; and a base unit that can be installed On the rear luggage rack of the two-wheeled vehicle, and having a fixing base, a locking group disposed on the fixing seat and capable of being inserted into the fixing card group, and a locking group mounted on the fixing seat and enabling the clamping group a first quick release group that is firmly coupled with the card set, the card set and the card set are embossed, and the first quick release group has a wrench pivotally connected to the fixed seat, and the switch is operated The rotation of the block enables the card set to be snapped or moved away relative to the card set. A safety seat device mounted on a two-wheeled vehicle as claimed in claim 1, wherein the rear wheel carrier unit of the trolley unit has a pair of rear wheel frame bars and a control rod disposed on the rear wheel frame bars. Each of the rear wheel rods has an elongated hole for the control rod, the connection group has a pair of connecting rods, each of the connecting rods has a pair of card holes that should be open at both ends of the control rod and laterally open Pushing the lever causes the handle set to transition between the deployed state and the collapsed state. A safety seat device mounted on a two-wheeled vehicle as claimed in claim 1, wherein the connecting rod set of the trolley unit has a pair of first links pivotally connected between the handle set and the front wheel carrier set, a second link pivotally connected between the handle set and the front wheel set and located on one side of the first link, and a pair of third links respectively pivotally connected to the second links And a fourth link pivotally connected to the third link and a pair of fifth links pivotally connected between the front wheel frame group and the rear wheel frame group, respectively, the fourth link is respectively pivotally connected to The rear wheel frame set. A safety seat device mounted on a two-wheeled vehicle as claimed in claim 3, wherein the first links of the link set of the trolley unit each have a first axis pivotally connected to an upper bottom of the handle set a pivoting portion and a first pivoting portion opposite to the first pivotal portion and pivotally connected between the lower top portion of the front wheel carrier and the front roller, the second links each having a pivotal connection thereto a second shaft pivot portion above the upper bottom of the handle set, a second pivot portion opposite to the second shaft pivot portion and pivotally connected to the lower top of the front wheel carrier group, and a second pivot portion opposite to the second pivot portion a pulling portion disposed outside the second pivoting portion, the pulling portion and the third connecting rod are pivotally connected to each other. A safety seat device mounted on a two-wheeled vehicle as claimed in claim 1, wherein the coupling unit has a first side portion corresponding to the front rollers and a second side portion opposite to the first side portion The embedded card set has a first insert member disposed on the first side portion and having an inverted L shape, and a second insert member disposed on the second side portion and having an inverted T shape, the base unit The clamping group has a pair of first clamping members arranged in an inverted L shape and a second clamping member rotatable relative to the fixing seat, the first clamping members and the first fastening member And the second fastening component is interlocked with each other, and the first quick release group can drive the second clamping component to generate a buckle or a distance relative to the second fastening component. The safety seat device mounted on the two-wheeled vehicle according to claim 5, wherein the first quick release group of the base unit further has a linkage block pivotally connected to the trigger block, the linkage block and the second The clamping member is pivotally connected, and the pulling block can be used to drive the second clamping member to engage or disengage relative to the second fastening member. A safety seat device mounted on a two-wheeled vehicle as claimed in claim 1, further comprising a seat unit detachably mounted to the coupling unit, the coupling unit further having a coupling seat disposed at the top and at least a second quick release group mounted on the joint, the joint having a pair of inverted L-shaped joints, the seat unit having a fastener disposed at the bottom and insertable with the joints a card stack corresponding to the card fastener, the card fastener has a pair of card slots disposed opposite to each other and nesting, and the binding seat of the bonding unit and the card fastener are concave and convex, and the operation is performed The two quick-release groups can firmly bond the joint member with respect to the fastener, and the stack of the seat unit can be embedded with the joint member and one of the card sets. The safety seat device mounted on the two-wheeled vehicle according to claim 7, wherein the seat unit further has a seat member, a headrest member adjustably mounted on the seat member, and a An adjustment group between the seat member and the headrest member, the adjustment set is operable to cause the headrest member to move up and down relative to the seat member. The safety seat device mounted on the two-wheeled vehicle as claimed in claim 8, wherein the adjustment unit of the seat unit has a body fixed to the seat member, and is mounted to the headrest member and is opposite to the headrest member The body generates a sliding sliding member, a sliding member slidably mounted inside the sliding member, and an elastic member that elastically abuts between the sliding member and the sliding member. The body has a sliding slot and a plurality of connections a sliding groove disposed at intervals in the sliding groove, the sliding member having a shell member and at least one flexible plate capable of elastically biasing relative to the casing member, the flexible plate having a tooth relative to any tooth The slot generates a card jammed card and a stud disposed on one side of the card block, the slider member having an operating end and at least one guiding portion opposite to the operating end and having an inclined shape, the stud and the stud The guiding members are nested with each other, and the elastic force of the elastic member constantly causes the operating end to be displaced toward the flexible plate. When the operating end of the sliding member is operated, the guiding portion can guide the convex portion. The column drives the block away from the toothed groove, and the elastic member contains a rebound elastic force, and the slider is released When the operating end of the piece is used, the rebounding force of the elastic member can cause the card block to be inserted with respect to the toothed groove.