CN1461869A - Safety door for chidren - Google Patents

Abstract

The invention provides a safety gate for an infant having a wide adjustment range of door width and frame width so as to be attachable and detachable to various kinds of passage widths in general dwelling houses, and featuring further a light weight and excellent appearance. This safety gate for an infant has a frame body 10 continuously connecting both lower end parts of lateral side frames 11 and 12 by a lower frame 13, and a door body 20 arranged within the frame body 10 and pivotally supported by one of the side frames to be longitudinally rotatable, the frame body 10 being attached and detached across a passage. Each of the lower frame 13 and the door body 20 is formed by slidably engaging a plurality of members so that the whole substantially horizontal length dimension is variable.

Description

The child uses safety door

Technical field

The present invention relates to the child and use safety door, can be installed in towards the passageway or the entrance of stair, to prevent arbitrarily danger such as child by producing.

Background technology

Existing this child for example opens put down in writing on the flat 11-332703 communique such the spy with safety door, have in left and right side frame and connect the framework that constitutes by underframe, configuration and in this framework by the body that freely rotates of the direction forwards, backwards of supporting pivotally one of in the described bogie side frame, can between two of passage relative sidewalls, install and pull down for making described framework, by screw-threaded engagement support component is arranged on the lateral surface of above-mentioned two bogie side frames, and make the two relative walls of termination squeezing passage of this pillar part.

But,, satisfies the passage of different in width by the screw-in amount of adjusting support component needs are installed, so the width adjustment scope between the support component of the left and right sides is little, can not install between relative two walls of wide or narrow passage according to above-mentioned prior art.

And according to technology in the past, the door body adopts the blow molding of synthetic resin material, and the thickness that Men Tiyou is certain seems heavier, so people wish to seek a kind of from the more frivolous door body of visual effect.

Summary of the invention

The present invention is in view of the defective of above-mentioned prior art and propose.Purpose of the present invention just provides a kind of child and uses safety door, and the width of its body and doorframe has big adjusting range, and the multiple channel width that can be adapted in the general home-use dwelling house mounts and dismounts, and has in light weight and characteristics good looking appearance.

In order to address the above problem, in first invention, provide a kind of child to use safety door, comprise: two frameworks that end portion constitutes that connect left and right bogie side frame by underframe, configuration and in this framework by the body that freely rotates of the direction forwards, backwards of supporting pivotally one of in the described bogie side frame, described framework can install and pull down at interchannel, it is characterized in that, described underframe and described door body are combined with a plurality of slidably parts respectively, so that described underframe and described door body overall width in the horizontal direction can be changed.

In addition, in second invention, above-mentioned door body is made of a plurality of door-plates, and described door-plate has the ripple plate portion that extends setting on general horizontal direction, and a plurality of ripple plates of described a plurality of door-plates overlap each other.

In addition, in the 3rd invention, in described underframe, be used for tubular part that will be fixing and be used for the tubular part that another bogie side frame is fixing, in described another bogie side frame, be coated with the guard shield that trips of preventing that the longitudinal section becomes approximate trapezoid on the fixing tubular part according to overlapping inside and outside the slidably flexible mode.

In addition, in the 4th invention, upper and lower sides in the bogie side frame of swinging end part one side of described door body is respectively arranged with recess, and the upper and lower sides in the swinging end part of described door body is respectively arranged with the jut in described each recess of sliding type turnover, and is provided with the functional unit that makes described jut enter into described recess in the upper end of described swing part.Described each jut combines by this way with the described functional unit that can slide up and down respectively, promptly when described door body is closed, described jut contacts with the marginal portion of described recess and after entering wherein, outstanding in described recess, and when described door body is opened, carry out chain motion along with the action of described operation part and enter in the described recess.

In addition, in the 5th invention, also have the locking mechanism that can pin described door body, this locking mechanism can make described functional unit separate with described door body.

In addition, in the 6th invention, the described bogie side frame that pivotally supports described door body comprises: with the synchronous tubular portion that rotates of described door body; Under making the outstanding state of upper and lower end parts, insert the shaft supporting part in the described tubular portion; With the described up and down distolateral coating of this shaft supporting part and with the tubulose liner that be slidingly installed of described tubular portion as a unitary rotation; The tubulose safety collar that between shaft supporting part and described tubulose liner, is provided with; Thereby make described tubulose liner of bolt partial penetration and tubulose safety collar by being threadably engaged in the carrying bolt parts on the described shaft supporting part making to contact with the passage road surface under the outwards outstanding state of the head that slides, on the wall of described tubulose liner, the slotted hole that formation along the circumferential direction screws in the bolt part of described carrying bolt parts, described safety collar covers described slotted hole from the inboard of described tubulose liner, thereby prevents from finger is inserted in this slotted hole.

Description of drawings

Fig. 1 is the stereogram of child of the present invention with safety door one example.

Fig. 2 is the sectional view of (II)-(II) line among Fig. 1, has shown the closed condition of door body.

Fig. 3 is the sectional view of (III)-(III) line among Fig. 1, has shown the closed condition of door body.

Fig. 4 is the decomposition front view of the installation constitution of tubulose liner and safety collar in the left side frame.

The working of an invention mode

Specify embodiments of the present invention below in conjunction with accompanying drawing.

This child comprises with safety door A: at left and right bogie side frame 11, by underframe 13 two end portions are connected the framework 10 that forms in 12, the door body 20 that the direction forwards, backwards that pivotally supports on configuration and the left side frame 12 is therein freely rotated in this framework 10.(referring to Fig. 1).

Framework 10 is by making 11 one-tenth verticals of left frame chimeric with the left part (left part among Fig. 1) of underframe 13 and make that the right part (right part among Fig. 1) of 12 one-tenth verticals of left side frame and this underframe 13 is chimeric to be constituted.By left and right, upper and lower carrying bolt parts 14,14,14,14, can with this framework 10 between two relative walls of passage and the entrance of downward step install or pull down.

Underframe 13 by total length in the horizontal direction variable with overlapping left and right sides tubular part 13a inside and outside can the mode of sliding extension, 13b, will and will constitute with the fixing left side link 13c of the chimeric left frame of the left end portion of left side tubular part 13a 11 with the fixing right side link 13d of the chimeric left side frame of the right end portion of right side tubular part 13b 12.

For be used for can sliding extension left and right two tubular part 13a, the 13b stationary device, as long as can be with two bodys according to tubular part 13a, the needed width of 13b be fixed, and many modes can be arranged.For example, can be in becoming on the outer wall of the tubular part of pipe configuration spring-like pearl can be diametrically inwardly and the bossing that outwards haunts, correspondingly on the length direction of the inwall of the tubular part that becomes outer tube simultaneously be equipped with a plurality of combined holes that can combine lug boss and above-mentioned combined hole will be meshed to fix according to desirable length with above-mentioned jut.Perhaps, a plurality of screwed holes of configuration on the outer wall of the tubular part of pipe in becoming a plurality ofly pass through jack at bolt becoming to be provided with on the tubular part of outer tube, pass through on the jack at desirable above-mentioned bolt and pass through screw-threaded engagement from outside inserting bolt with above-mentioned screwed hole.

Left side connector 13c by chimeric at the left end of left side tubular part 13a and from above coat this left side tubular part 13a with the guard shield part 13c1 that prevents to trip and with this guard shield part 13c1 that prevents to trip on and roughly the end portion of upright left frame 11 chimeric above telescoping part 13c2 constitute one.In an example of present embodiment, see from the front roughly to be the L word shape.Like this, this left side link 13c has jut 25a deciliter the recess 13c3 that is used for door 20 downsides described later on the above-mentioned left-hand end that prevents the guard shield part 13c1 that trips, in the marginal portion of recess 13c3, with the relative position of above-mentioned lower projection part 25a, form the guide surface 13c4 (referring to Fig. 3) of rounded corner shape.In addition, above described among the telescoping part 13c2 outside of framework 10 carrying bolt parts 14 are installed.

The above-mentioned guard shield part 13c1 that trips that prevents has the inclined plane with the back in front, and its longitudinal section roughly in echelon.Its bottom surface forms and can embed and break away from left side tubular part 13a and right side tubular part 13b.

Like this, prevent that the left frame 11 that the guard shield part 13c1 that trips is pasting among left side tubular part 13a and the right side tubular part 13b from coating.That is, child who walks about between left frame 11 and left side frame 12 etc. passes left frame 11 usually and walks around a body 20.Like this, be provided with on one side against left frame 11 by the guard shield part 13c1 that will prevent to trip, just can prevent that the child from tripping etc., and near the left side frame 12, because childs etc. can or not produce the problem that trips even right side tubular part 13b exposes also from process here.

Right side link 13d is by constituting with the chimeric side telescoping part 13d1 in the right part of right side tubular part 13b with the chimeric top telescoping part 13d2 of the end portion of substantially roughly upright left side frame 12 on the telescoping part 13d1 of this side.

Left frame 11 is to become axle shape or the tubular part that roughly is entrenched on the above-mentioned left side link 13c vertical, and chimeric in the top have a bonded block 11a that combines with door body 20 described later.

The upper end of bonded block 11a in framework 10 inboards is formed with notch portion 11a1, on this notch portion 11a1, is formed for combining with the jut 25b of door described later body 20 upsides and the recess 11a2 of disengaging.In the marginal portion of this recess 11a2,, form the guide surface 11a3 (referring to Fig. 3) of rounded corner shape at the jut 25b position vis-a-vis of above-mentioned upside.In addition, carrying bolt parts 14 described later are installed in the outside of framework 10 in this bonded block 11a.

Left side frame 12 by and tubular portion 12a, this tubular portion 12a of door 20 unitary rotation in insert shaft supporting part 12b, the liner 12c that coats the tubulose of this shaft supporting part 12b upper end side, the tubulose liner 12d that coats this shaft supporting part 12b lower end, be arranged on shaft supporting part 12b and tubulose liner 12c between and be arranged on tubulose safety collar 12e between shaft supporting part 12b and the tubulose liner 12d, 12e constitutes (referring to Fig. 4).At above-mentioned tubulose liner 12c, run through respectively among the 12d into support component 14 described later.

Shaft supporting part 12b is the parts of a shape or tubulose, and forms basic plumbness with right side link 13d is chimeric.

Tubular portion 12a is the position of the tubulose that forms as one of the right side door-plate 22 with door described later body 20.Be sleeved on the above-mentioned shaft supporting part 12b, and expose the distolateral up and down of this shaft supporting part 12b.

Safety collar 12e is the tubular part that is set on the two ends up and down of exposing of shaft supporting part 12b, and the key 14b of carrying bolt 14 described later passes through during the insertion.The external diameter of safety collar 12e is set to and tubulose liner 12c, and the degree that the inwall of 12d is slidingly connected at tubulose liner 12c, covers slotted hole 12c1 described later, 12d1 from the inboard among the 12d.

The tubulose liner 12c of upper end side is mounted to tubular portion 12a and rotates for the upper end of exposing of coating shaft supporting part 12b and the tubulose that the end is arranged of above-mentioned safety collar 12e.Be formed with the slotted hole 12c1 that passes through the level that inserts in wherein at the threaded portion 14b of circumferencial direction guide support bolt member 14 on the perisporium of this tubulose liner 12c.

The tubulose liner 12d of lower end side is mounted to tubular portion 12a and rotates for the lower end of exposing of coating shaft supporting part 12b and the tubulose that the end is arranged of above-mentioned safety collar 12e.On the wall of this tubulose liner 12d, be formed with the slotted hole 12d1 that passes through the level that inserts in wherein at the threaded portion 14b of circumferencial direction guide support bolt member 14.

According to the left side frame 12 of above-mentioned structure, by safety collar 12e, 12e can prevent that the child from will point from tubulose liner 12c, the slotted hole 12c1 of 12d, and 12d1 inserts.

In addition, in the above-mentioned framework 10, with the outwards outstanding carrying bolt parts of its head 14a are threaded, to contact with channel wall etc.

Each carrying bolt parts 14 be by the cylinder termination 14a that has jog on the outer peripheral face and in outstanding threaded portion 14b constitutes from the center of this head 14a, the upper and lower side of left frame 11 and in left side frame 12 upper and lower side of shaft supporting part 12b pass through screw-threaded engagement respectively.

Adjust the amount of being screwed into of these carrying bolt parts 14 respectively, make its head 14a two walls contact relative with passage.

Next, describe door body 20 on the framework 10 be installed in said structure in detail.

Door body 20 is slidably to be combined by right side door-plate 22 and left side door-plate 21, so that the total length of horizontal direction is variable.

Right side door-plate 22 be the injection moulding processes with the synthetic resin material form roughly be tabular parts, a plurality of corrugated sheet part 22a that upper and lower sides has the longitudinal section to be the corrugated sheet shape respectively extend setting on the direction of approximate horizontal.At its right-hand member lateral parts, above-mentioned tubular portion 12a is formed as one with it.Be formed with the slotted hole 22b1 of general horizontal direction on the flat part 22c that flat part 22b that the upper side of this right side door-plate 22 forms and lower side form respectively, 22c1.Can insert door length adjustment bolt 24 among this slotted hole 22b.In addition, on 22 top and bottom of this right side door-plate respectively to the sweep 22d and the sweep 22e of the direction bending of approximate horizontal.

Above-mentioned length adjustment bolt 24 is fixed with threaded portion 24a coaxially at the center of the head 24b that is formed with shapes such as flower and personage, and available hand is taken down above-mentioned head 24b.

Left side door-plate 21 be the injection moulding processes with the synthetic resin material form roughly be tabular parts, be provided with overlapping a plurality of corrugated sheet part 21a on each ripple plate portion 22a at above-mentioned right side door-plate 22 in extension on the direction of approximate horizontal.Form as one at the sidepiece of its left end and the tubular portion 21b that is used to be equipped with locking mechanism 25 described later.In addition, be formed with sweep 22d and sweep 21c and sweep 21d in the upper end-face edge of this right side door-plate 22 and the lower edge respectively to the direction bending of level.

The left side door-plate 21 and the right side door-plate 22 of said structure are piled up, and have just formed the adjustable door body 20 of total length in the horizontal direction.At this moment, the corrugated sheet part 21a of the corrugated sheet part 22a of right side door-plate 22 and left side door-plate 21 is overlapping, the sweep 22d that overlaps at position, the top, 21c and the sweep 22e that overlaps at position bottom, embed link 23 on the 21d respectively, so that two door-plates are inseparable.

Like this, at the 22b1 of slotted hole up and down of right side door-plate 22, the 22b1 place inserts a door length adjustment bolt 24 respectively, and the threaded portion 24a and the left side door-plate 21 of door length adjustment bolt 24 passed through screw-threaded engagement.Have again, as with above-mentioned threaded portion 24a and left side door-plate 21 method by screw-threaded engagement, can be at the flat part up and down of left side door-plate 21 21e, form screwed hole respectively on the 21f and threaded portion 24a and this screwed hole are passed through screw-threaded engagement, also can be at flat part 21e up and down, last hold-down nut parts of 21f and this nut part and threaded portion 24a are passed through screw-threaded engagement.

Above-mentioned link 23 can be made by having plastic metal sheet or synthetic resin material etc., can form to coat overlapping above-mentioned sweep 22d, 21c or sweep 22e, the shape of 21d.From sweep 22d, the top of 21c or from sweep 22e, the below of 21d embeds, left side door-plate 21 can slide smoothly with respect to right side door-plate 22, right side door-plate 22 and left side door-plate 21 about combining on the position.

Like this,, can slide with respect to right side door-plate 22, just can change the total length of a body 20 on general horizontal direction by making left side door-plate 21 according to above-mentioned formation.And left side door-plate 21 is owing to introduce overlapping corrugated sheet part 21a and corrugated sheet part 22a, and its slip can be carried out smoothly.And, after the total length of door body 20 is adjusted to desirable length,, just left side door-plate 21 can be fixed on the right side door-plate 22 by the length adjustment bolt 24,24 of Xiamen is set.

Describe below that swinging end part with door body 20 combines with left frame 11 in detail and disengaging and be in the locking mechanism 25 that locks under the closed condition at door body 20.

Locking mechanism 25 comprises: what the upper end of tubular portion 21b was provided with in above-mentioned left side door-plate 21 can be at the functional unit 25c of above-below direction slip, the jut 25b that the ledge 25c1 that forms on this functional unit 25c haunts downwards, the lower projection part 25a that haunts downwards in the lower end side of this tubular portion 21b, make above-mentioned upper and lower jut 25b, the interlinked mechanism 25d (with reference to figure 3) of the action interlock that submerges of 25a, and the latch mechanism 26 that aforesaid operations parts 25c is fixed and decontrols.

Operating portion 25c is made of the 11 1 side-prominent ledge 25c1 of bogie side frame left that form as one with the part 25c2 that is slidingly connected that tubular portion 21b can combine with being free to slide.

Above-mentioned ledge 25c1 forms can be with the notch portion 11a1 of bonded block 11a in the left frame 11 free chimeric and break away from, but forms jut 25b easy on and off that upside described later the haunts activity space part 25c11 of combination with it slidably in inside.

In addition, the above-mentioned part 25c2 that is slidingly connected is provided with latch mechanism 26 described later, in above-mentioned ledge 25c1, the jut 25b that haunts of upside is set.

The jut 25b that haunts of upside is can be free among the recess 11a2 of bonded block 11a in left frame 11 chimeric and the tubular part that the end is arranged that breaks away from, and its lower end is formed with the rounded corner part 25b1 (with reference to figure 3) that the guide surface 11a3 in the marginal portion with above-mentioned recess 11a2 contacts.Haunt jut 25b in the combination slidably of the inner easy on and off of the ledge 25c1 of functional unit 25c.

Like this, by being configured in the blade of a sword shape part 25b1 that the upper end periphery forms in the activity space part 25c11 in ledge 25c1, the jut 25b of this upside from below extruding the time slide upward, when unclamping, utilize its deadweight to slide downwards from the extruding of below.

In addition, combine with the inside of protuberance 25c1,, slide upward with functional unit 25c so that when functional unit 25c promotes upward at this upside jut 25b.

And, can in protuberance 25c1 and between the upside jut 25b, the compression spring be set, by this compression spring, upside jut 25b is moved downward.

Lower projection part 25a in its end portion, be formed with underframe 13 in the freely chimeric and downward bossing 25a1 that breaks away from of the recess 13c3 of left side link 13c.Lower projection part 25a can slide up and down with the parts of manner combination by bearing bracket stand in the lower end of tubular portion 21b etc.

In the bottom of above-mentioned downward bossing 25a1, form the rounded corner part 25a11 that the guide surface 13c4 (with reference to figure 3) in the marginal portion with above-mentioned recess 13c3 contacts.

Like this, in the jut 25a of this downside, embedding and fixing interlinked mechanism 25d described later are bottom.

Interlinked mechanism 25d is by the upside rod-like members 25d1 in the chimeric part 25c2 that is slidingly connected that is fixed on functional unit 25c and is fixed on (referring to Fig. 2 and Fig. 3) that the downside rod-like members 25d2 in the jut 25a of downside is formed by connecting in the mode that can slide up and down.

Upside rod-like members 25d1 is the banded or axle shape of long chi, is formed with the activity space part 25d11 that the slotted hole by above-below direction constitutes in its lower end.

Downside rod-like members 25d2 and above-mentioned upside rod-like members 25d1 similarly are the banded or axle shape of long chi, are formed with the activity space part 25d21 that the slotted hole by above-below direction constitutes in the top.

Like this, the activity space part 25d11 of the lower end of the activity space part 25d21 of downside rod-like members 25d2 and upside rod-like members 25d1 is to intert the mode of the two perforation into rivet parts 25d3.

Like this, when downside rod-like members 25d2 pushes downwards,, under the motionless state of upside rod-like members 25d1, slide upward by above-mentioned activity space part 25d11 and 25d21.

In addition, this downside rod-like members 25d2 is when upside rod-like members 25d1 lifts upward, by following the tracks of its motion with rivet parts 25d3 with combining of upside rod-like members 25d1.

In addition, latch mechanism 26 is such mechanisms, is inserted with rotating spindle unit 26a in the part 25c that is slidingly connected of functional unit 25c.On this spindle unit 26a, from functional unit 25c outside fitting operation bar 26b, simultaneously from the installed inside activity template 26c of this functional unit 25c.Make aforesaid operations bar 26b (with reference to the figure 3) interlock of activity template 26c (with reference to figure 2) and rotary manipulation, just can make among the recess 21g of 26c to spin off in conjunction with the end formation of jut 26c1 and left side door-plate 21.

Like this, in above-mentioned locking mechanism 25, when the door body was closed, the jut 25b of upside can cross the marginal portion of the recess 11a2 of bonded block 11a in the left frame 11, and 11a2 is chimeric with this recess.On the other hand, the jut 25a of downside also can cross the marginal portion of the recess 13c3 of left side link 13c in the left frame 11, and 13c3 is chimeric with this recess.At this moment, the jut 25a of the jut 25b of upside and downside is respectively by activity space part 25c11, activity space part 25d11 and activity space part 25d21 and independently slide up and down.

In addition, when the operation by functional unit 25c is opened a body 20, along with the functional unit 25c interlock that lifts, thereby the jut 25a of the jut 25b of upside and downside is upwards slided, deviate from from recess 11a2 and recess 13c3.

In addition, when door body 20 is closed and is pinned, the action bars 26b that is in closed condition of a body 20 is rotated to the lock direction, make combining with the recess 21g of left side door-plate 21 of activity template 26c, functional unit 25c can upwards not lifted in conjunction with jut 26c1.

Therefore the present invention can obtain following effect owing to have structure described above.

According to first invention, underframe and door body have adopted respectively the slidably combination of a plurality of parts Structure, therefore, underframe and the door body the width adjustment scope compared with prior art can be significantly Improve. Thereby provide the installation that can adapt to multiple different in width passage in the general home dwelling and Pull down the safety door for chidren of requirement.

According to second invention, by corrugated plating part by making smoothly sliding extension of a plurality of door-plates Leader consists of, and can improve the intensity of each door-plate by this corrugated plating part. Thereby make the child Door body with safety door can have gossamery structure in the situation that keeps suitable intensity, and The combination of the visual effect of above-mentioned corrugated portion is so that the corrugated plating good looking appearance of the shop front and light.

According to the 3rd invention, prevent from that the guard shield that trips from constituting coating child and wait in the scope pass through The downside tubular part, namely in the not pivotally bogie side frame of a side of supporting door body (door body swing The bogie side frame of side) upper fixing tubular part. Therefore, the length of the guard shield that prevents from tripping can be established Be set to the expanding-contracting action that neither affects two tubular parts, can prevent effectively that again child etc. from tripping The minimum length of necessity. And in a side of support door body pivotally, because the child can not led to What cross, so even without the guard shield that prevents from tripping, certainly also can not have danger.

According to the 4th invention, because door body upper and lower jut when closing can be distinguished independently The ground action is combined with recess, on one side the door body is closed even for example on one side upper and lower end parts is rocked back and forth The time, be combined with recess successively by top and bottom, also can be positively with the locking of door body.

According to the 5th the invention, when the door body is in blocking, by with the aforesaid operations parts with the door The door body connects, and the door body can be pinned. Like this, can make the locking that prevents that the child from opening the door body Mechanism has the simple structure of throwing off functional unit.

According to the 6th invention, can prevent effectively that by safety collar the child from will point the insertion tubulose In the slotted hole on the liner sidewall.

Claims (6)

1. the child uses safety door, comprise: two frameworks that end portion constitutes that connect left and right bogie side frame by underframe, configuration and by the body that freely rotates of the direction forwards, backwards of supporting pivotally one of in the described bogie side frame in this framework, described framework can and be pulled down in the interchannel installation

Described underframe and described door body overall width in the horizontal direction it is characterized in that described underframe and described door body are combined with a plurality of slidably parts respectively, so that can be changed.

2. child according to claim 1 uses safety door, it is characterized in that, described door body is made of a plurality of door-plates, and described door-plate has the ripple plate portion that extends setting on general horizontal direction, and a plurality of ripple plates of described a plurality of door-plates overlap each other.

3. child according to claim 1 and 2 uses safety door, it is characterized in that, in the described underframe, be used for tubular part that will be fixing and be used for the tubular part that another bogie side frame is fixing, in described another bogie side frame, be coated with the guard shield that trips of preventing that the longitudinal section becomes approximate trapezoid on the fixing tubular part according to overlapping inside and outside the slidably flexible mode.

4. use safety door according to each described child of claim 1 to 3, it is characterized in that, upper and lower sides in the bogie side frame of swinging end part one side of described door body is respectively arranged with recess, and the upper and lower sides in the swinging end part of described door body is respectively arranged with the jut in described each recess of sliding type turnover, and be provided with the functional unit that makes described jut enter into described recess in the upper end of described swing part

Described jut combines by this way with the described functional unit that can slide up and down respectively, promptly when described door body is closed, described jut contacts with the marginal portion of described recess and after entering wherein, outstanding in described recess, and when described door body is opened, carry out chain motion along with the action of described operation part and enter in the described recess.

5. child according to claim 4 uses safety door, it is characterized in that, also has the locking mechanism that can pin described door body, and this locking mechanism can make described functional unit be connected and separate with described door body.

6. use safety door according to each described child of claim 1 to 5, it is characterized in that, the described bogie side frame that pivotally supports described door body comprises: with the synchronous tubular portion that rotates of described door body; Under making the outstanding state of upper and lower end parts, insert the shaft supporting part in the described tubular portion; With the described up and down distolateral coating of this shaft supporting part and with the tubulose liner that be slidingly installed of described tubular portion as a unitary rotation; The tubulose safety collar that between shaft supporting part and described tubulose liner, is provided with; Thereby make the described tubulose liner of bolt partial penetration and tubulose safety collar by being threadably engaged in the carrying bolt parts on the described shaft supporting part under the outwards outstanding state of the head that slides making to contact with the passage road surface,

On the wall of described tubulose liner, the slotted hole that formation along the circumferential direction screws in the bolt part of described carrying bolt parts, described safety collar covers described slotted hole from the inboard of described tubulose liner, thereby prevents from finger is inserted in this slotted hole.

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