CN101224754B - Baby carriages - Google Patents

Abstract

The invention provides a baby carriage, in which the posterior wheels thereof can shift to be respectively fit for service state and folded state without unnatural attitude of the user. The baby carriage comprises a first linkage mechanism provided with front wheels and hand pushed frame as connection rod parts and viewed to be approximate parallelogram from the direction of the carriage width and the hand pushed frame approximately parallelly moving downwards when the carriage body deforms from the service state to the folded state; a second linkage mechanism provided with a pair of posterior wheel arms used as connection rod parts and approximately parallelly disposed to form the posterior wheels of the carriage and viewed to be approximate parallelogram, wherein the posterior wheels shift at the fore and aft direction of the carriage body when the second linkage mechanism acts; a linkage hitch mechanism for connecting the first linkage mechanism and the second linkage mechanism, therefore the linkage hitch mechanism acts together with the first linkage mechanism when the first linkage mechanism is operated to make the carriage deform from the service state to folded state, so that the posterior wheels shift towards the front wheels.

Description

Perambulator

Technical field

The present invention relates to have the perambulator that stops collapsible vehicle body, wheel rotation lock function Caster (caster) and adopted the perambulator of this Caster.

Background technology

At present, as this perambulator, have the hand push framework is gone back near the root of its handle and folding structure.As other perambulator, the also perambulator of known following structure, promptly, the forward foot in a step, handrail, hand push framework and seat framework are formed connecting rod mechanism as linkage component,, the hand push framework is moved downwards by the operation of this connecting rod mechanism, and the handrail and the rear foot are rotated binding freely, hand push framework and the rear foot are linked through the crus curvilineum carriage, the rear foot is rotated towards the forward foot in a step, vehicle body is folded (for example with reference to patent documentation 1) with the action of hand push framework.

In addition, the front-wheel of perambulator, be front-wheel and trailing wheel sometimes, utilize the Caster that possesses the lock function that stops wheel to be installed in (for example with reference to patent documentation 2) on the pin framework.

Patent documentation 1: Japan opens flat 6-37050 communique in fact

Patent documentation 2: TOHKEMY 2002-284015 communique

In the conventional example that the hand push framework is turned back in the middle, near ground, when the user wants operating handle, force it will adopt so factitious posture of squatting down at the folded state lower handle.On the other hand, be installed on freely in the conventional example that makes its rotation on the handrail in upper end rotation the rear foot, because it is the simple rotational motion at center that the rear foot and trailing wheel carry out with the point of contact with handrail, so the rear foot during body distortion and the displacement of trailing wheel are very limited, thereby can not under running condition and each state of folded state, make the rear foot and trailing wheel be indexed to suitable position.Even for example for the axletree of the trailing wheel about under folded state, also will making in the axial direction unanimity, the rotary centerline that need make the rear foot is also in overall width direction unanimity.In this case, can not make the rear foot and trailing wheel to the displacement of overall width direction.Therefore, guarantee that even folded state, trailing wheel also can be extruded always under the situation of stability of vehicle body trailing wheel fully being pressed to the overall width direction outside under the running condition, thereby just in the rotational motion of trailing wheel, vehicle body can not be folded compactly in the overall width direction.Under folded state,, can not make the rear foot and trailing wheel to the displacement of overall width direction in order to avoid the interference with the forward foot in a step or front-wheel.

Summary of the invention

Therefore, the objective of the invention is to, a kind of perambulator is provided, the user needn't force and adopt factitious posture when carrying out the deformation operation of vehicle body, and alleviation during with body distortion the rear foot and the relevant restriction of displacement of trailing wheel, can make the rear foot and trailing wheel be indexed to the position that is suitable for running condition and folded state respectively.

In addition, when under the state that has stoped wheel at Caster from the road surface during, to rotating relevant parts and apply load with stoping to the wheel input torque.Under the excessive situation of this load, may produce component parts distortion or damaged such unfavorable conditions such as Caster.

Therefore, the objective of the invention is to, wheel input excessive torque also is difficult to the distortion or the damaged Caster of production part and applies flexibly the perambulator of this Caster even provide a kind of.

For solving above-mentioned problem, the invention provides a kind of perambulator (1), vehicle body (2) can be out of shape between running condition and folded state, wherein, possess: first connecting rod mechanism (L1), it comprises the forward foot in a step (4) of described vehicle body and hand push framework (8) as linkage component, and observes from the overall width direction and to constitute approximate parallelogram, make described vehicle body from described running condition during to the distortion of described folded state, described hand push framework moves downwards almost parallel; Second connecting rod mechanism (L2), it forms approximate parallelogram, comprise that a pair of rear foot arm (25,26) is as linkage component, the mutual almost parallel of described a pair of rear foot arm ground configuration also constitutes the rear foot (5) of described vehicle body, makes the fore-and-aft direction displacement of this rear foot at described vehicle body during described second connecting rod mechanism action; Connecting rod hookup mechanism (30,35,36), it links described first connecting rod mechanism and described second connecting rod mechanism, make when making described vehicle body operate described first connecting rod mechanism to the distortion of described folded state from described running condition, action interlock with this first connecting rod mechanism makes the described rear foot towards described forward foot in a step displacement.

In perambulator of the present invention, owing to the hand push framework is moved almost parallel downwards by first connecting rod mechanism, folding simultaneously vehicle body, therefore, even under folding state, also the handle that is disposed at hand push framework upper end can be maintained higher position.Thus, when carrying out the deformation operation of vehicle body, the user is forced take such illogical attitudes of squatting down.In addition, owing on the rear foot, be provided with a pair of rear foot arm, and be provided with and comprise described a pair of rear foot arm as the tetragonal second connecting rod of the almost parallel of linkage component mechanism, therefore, when folding vehicle body, remain under the state of the direction identical at the trailing wheel that will be supported, can make fore-and-aft direction, above-below direction and the displacement of overall width direction of the rear foot and trailing wheel to vehicle body with running condition by the rear foot.Thus, the displacement of the rear foot during relevant body distortion and trailing wheel restriction alleviated.Therefore, can under running condition, make the rear foot and trailing wheel to favourable position displacement such as guarantee to the stability of vehicle body, and under folded state, make the rear foot and trailing wheel to favourable position displacement of the densification of vehicle body etc., promptly, make the rear foot and trailing wheel be indexed to the position that is suitable for running condition and folded state respectively.

In perambulator of the present invention, also can constitute, described first connecting rod mechanism and described second connecting rod mechanism are set in the overall width direction both sides of described vehicle body, described second connecting rod mechanism makes described vehicle body during to described folded state distortion, make the described rear foot also to the inboard displacement of described overall width direction from described running condition.According to this mode, can under running condition, the rear foot be pulled out to outside the overall width direction, fully guarantee the distance between trailing wheel, improve the stability of vehicle body thus, on the other hand, can when folding, make the rear foot to the inboard displacement of overall width direction, dwindle the distance between trailing wheel, vehicle body is also folding compactly on the overall width direction.

In the perambulator of the present invention, also can constitute, described second connecting rod mechanism comprise described a pair of rear foot arm, with respect to the described forward foot in a step relatively the rear foot carriage (27) that is provided with of displacement ground, and the rear wheel support (28) of supporting wheels (11) as linkage component, an end separately and the rear foot carriage of described a pair of rear foot arm link rotationally, the other end separately and the described rear wheel support of described a pair of rear foot arm link rotationally, and described thus second connecting rod mechanism (L2) constitutes approximate parallelogram.According to this mode, can utilize rear foot arm and rear wheel support to constitute the tetragonal second connecting rod of almost parallel mechanism.

In addition, in aforesaid way, also can constitute, in the overall width direction both sides of described vehicle body described first connecting rod mechanism (L1) and described second connecting rod mechanism (L2) are set, described rear foot arm with respect to the oblique inclination of described overall width direction, makes that comparing the outside with described overall width direction inboard more is partial to vehicle body top and the place ahead with respect to the rotary centerline (Aq) of described rear foot carriage.Tilt by the rotary centerline that makes rear foot arm like this, can when folding vehicle body, make the rear foot and trailing wheel to the inboard displacement of axial direction.

Described rear wheel support also can be respectively under described running condition and described folded state with the supporting of the axletree (11a) of described trailing wheel for and described overall width direction almost parallel.According to this mode, not only under running condition, even under the folded state, also can make trailing wheel is that rotate at the center with the axletree towards axial direction.Thus, even under folded state, the trailing wheel that also can roll transports perambulator.

Also can constitute, when the rotary centerline with rear foot arm as above tilts like that, described connecting rod hookup mechanism possesses: the seat framework (7) that is configured between the described forward foot in a step and the described hand push framework and works as the linkage component of described first connecting rod mechanism, be erected at the union lever (30) between the rear foot arm (25) of the described seat framework and the described rear foot, and be located at respectively between this union lever and the described seat framework and this union lever and a described rear foot arm between Hooke's coupling (35,36), at least one distolateral Hooke's coupling of described union lever is ball and cocket joint (35).Under this situation, between the point of contact of seat framework and a rear foot arm and union lever, not only at the fore-and-aft direction and the above-below direction of vehicle body, even on the overall width direction, produce displacement, also can utilize Hooke's coupling to absorb this displacement, make the action that links sleekly of first connecting rod mechanism and second connecting rod mechanism in the configuration of the both ends of union lever.By at least one Hooke's coupling is made ball and cocket joint, can realize the subduing of number of components, miniaturization, lightweight.

In perambulator of the present invention, be provided with in overall width direction both sides under the situation of first connecting rod mechanism and second connecting rod mechanism, also can through Caster (101) mono-front-wheel (10) be installed in the bottom of the described forward foot in a step.In this mode, perambulator is constituted as the three wheeled perambulators that possess pair of rear wheels that disposes in overall width direction both sides and the mono-front-wheel that disposes in the bottom of the forward foot in a step.And when folding vehicle body, each trailing wheel thus also can be folding compactly in the overall width direction with vehicle body to the inboard displacement of overall width direction.

In the mode that possesses above-mentioned mono-wheel, also can constitute, the described forward foot in a step has a pair of forward foot in a step framework of arranging in described overall width direction (9), the bottom separately of described a pair of forward foot in a step framework is to described overall width direction inside bend, and mutually combine in overall width direction central authorities, through described Caster described mono-front-wheel is installed in the bottom of this combination.

In addition, also can constitute, have the Caster main body (103) that described front-wheel is installed on the described Caster and be located between the described Caster main body and the described forward foot in a step and the Caster retainer (102) of described Caster body abutment for rotating, barrel-contoured framework is set on described Caster retainer bears portion (105), the bottom that combines of described a pair of forward foot in a step framework is embedded in described framework and bears in the portion, and combines with this framework portion of bearing.

In perambulator of the present invention, also can constitute, described rear wheel support has the rack body (60) and the bearing seat (61) that can link rotationally around the fulcrum parallel with described overall width direction with respect to this rack body that links with described a pair of rear foot arm, described trailing wheel (11) is installed on the described bearing seat, is provided with relief means (63) between described rack body and described bearing seat.According to this mode, by the impact from the trailing wheel input being cushioned with relief means, thus can be to alleviating to the impact of the rear foot from the rack body transmission.Thus, impact is difficult to hand push framework or seat transmission, and the operation sense and the taking sense of perambulator all are improved.

In perambulator of the present invention, also can be provided with lockout mechanism between connecting rod (52), when it is in described running condition at described vehicle body, the described rear foot and the linkage component of described first connecting rod mechanism or the parts (51) that combine with this linkage component one are limited mutually.By such lockout mechanism is set, can reduce the number of components that between the first connecting rod mechanism and the rear foot, is provided with, can reduce rocking of vehicle body thus.

As mentioned above, in perambulator of the present invention, owing to utilize first connecting rod mechanism that the hand push framework is moved almost parallel downwards, folding simultaneously vehicle body, therefore, even under folding state, also the handle that is disposed at hand push framework upper end can be maintained higher position, thus, when carrying out the deformation operation of vehicle body, the user needn't be forced to take factitious posture.In addition, owing on the rear foot, be provided with a pair of rear foot arm, and be provided with and comprise this rear foot arm as the tetragonal second connecting rod of the almost parallel of linkage component mechanism, therefore, the restriction of the rear foot in the time of can relaxing relevant body distortion and the displacement of trailing wheel, and can make the rear foot and trailing wheel be indexed to the position that is suitable for running condition and folded state respectively.

In addition, for solving above-mentioned problem, the invention provides a kind of Caster (101), it possesses: Caster main body (103), and it installs wheel (10); Caster retainer (102), it becomes described Caster body abutment around the rotary centerline with the orthogonal axe of described wheel to rotate freely; Lock Part (104), it can move between following two positions, the first and described Caster main body are carried out ingear latched position (position of Figure 49) carrying out in relative rotation mode around described rotary centerline, another is to retreat into described Caster retainer one side than described latched position along described rotary centerline and remove with the ingear of described Caster main body and remove position (position of Figure 48), and described Lock Part is can't be around described rotary centerline carries out in relative rotation state with respect to described Caster retainer under, be installed on the described Caster retainer, mate in described Lock Part and described Caster main body is provided with tapering (104e, 108a), this tapering make the described Caster main body of input around the torque transfer of described rotary centerline for from described latched position towards the power of the direction of described releasing position and act on described Lock Part.

According to Caster of the present invention, when Lock Part was operated latched position, Lock Part and Caster body engages stoped the rotation of Caster main body with respect to the Caster retainer.When Lock Part is moved to when removing the position from latched position, the engagement releasing of Lock Part and Caster main body, the Caster main body is rotatable with wheel with respect to the Caster retainer.When Lock Part is positioned at latched position, if to Caster main body input torque, then this torque is transformed between the tapering of the mate of being located at Lock Part and Caster main body and Lock Part is pressed to the power of removing the position and act on the Lock Part from wheel.When the power after the conversion surpassed the required power of the action of Lock Part, Lock Part is driven to removed the position.Therefore, be input in excessive torque under the situation of Caster main body, Lock Part kept out of the way removed the position, thus, avoid distortion or damaged such unfavorable condition of parts.

In Caster of the present invention, also can between described Caster retainer and described Lock Part, be provided with the guide piece (106a, 104d) of described Lock Part to the Direction guide of described rotary centerline.According to this mode, can utilize guide piece that Lock Part is moved to the rotary centerline direction sleekly.

Described guide piece also can possess: guide rail (104d), and it is arranged on any of described Caster retainer or described Lock Part, extends in the direction of described rotary centerline; Rail groove (106a), it is arranged on any of described Caster retainer or described Lock Part, with described guide rail engagement.In this case, by so that rail groove and guide rail ingear mode are installed on the Caster retainer with Lock Part, can be with Lock Part reliably to the Direction guide of rotary centerline.

Also can between described Caster retainer and described Lock Part, be provided with intermeshing recess (106c) and protuberance (104d) when described Lock Part is positioned at described latched position.

By when being in latched position, making the engagement of recess and protuberance, produce the effect that Lock Part is remained on latched position, thus, with respect to giving resistance to removing retreating of position from latched position.Can utilize the zone of Lock Part being kept out of the way to do suitable adjustment according to the ingear degree of recess and protuberance by the power of tapering conversion.

Described Lock Part also can utilize elasticity to be embedded in the periphery of described Caster retainer.

In view of the above, Lock Part can be installed on the Caster retainer simply.

For solving above-mentioned problem, the invention provides a kind of perambulator (1), it possesses described Caster (101), and the described Caster retainer (102) of this Caster links with foot (4).According to perambulator of the present invention, in that being switched to latched position, Lock Part stops under the state of rotation of wheel, inadvertently this wheel is imported under the situation of big torque the rotation of tolerable wheel and avoid the damage of Caster.

Perambulator of the present invention also can have and possess at the mono-front-wheel (10) of overall width direction central configuration and be disposed at three wheeled structures of the pair of rear wheels (11) of overall width direction both sides.In this case, also described front-wheel can be installed in the described forward foot in a step (4) through described Caster (101).

Under the situation that is three wheeled perambulators, particularly therefore the torque big to the front-wheel effect easily, by using Caster of the present invention at this front-wheel, can apply flexibly Caster of the present invention effectively.

As mentioned above, according to Caster of the present invention, when Lock Part is positioned at latched position, if from wheel to Caster main body input torque, then between the tapering of the mate of being located at Lock Part and Caster main body, this torque is transformed into presses to the power of removing the position with Lock Part and acts on the Lock Part.When the power after the conversion surpassed the required power of the action of Lock Part, Lock Part is driven to removed the position.Therefore, be input in excessive torque under the situation of Caster main body, Lock Part kept out of the way removed the position, thus, avoid distortion or damaged such unfavorable condition of parts.

Need to prove that in the above description, for ease of understanding the present invention, the reference marks of band bracket mark accompanying drawing thus, the invention is not restricted to graphic form.

Description of drawings

Fig. 1 is the block diagram of the perambulator of a mode of the present invention;

Fig. 2 is the lateral plan of the formation under the one-sided running condition of the left and right directions (overall width direction) of expression vehicle body;

Fig. 3 is the lateral plan when making body distortion to folded state;

Fig. 4 be will make the appearance that changes to folded state from running condition of vehicle body be divided into the figure that a plurality of stages represent;

Fig. 5 is the mechanism map with the first connecting rod mechanism simplifying;

Fig. 6 A is the forward foot in a step of expression vehicle body when being in running condition and the lateral plan of the relation of the rear foot;

The figure of the state of the rear foot about Fig. 6 B is expression when the length direction of forward foot in a step framework is overlooked vehicle body and is in running condition;

Fig. 7 A is the forward foot in a step of expression vehicle body when being in folded state and the lateral plan of the relation of the rear foot;

The figure of the state of the rear foot about Fig. 7 B is expression when the length direction of forward foot in a step framework is overlooked vehicle body and is in folded state;

Fig. 8 will amplify the figure of expression near the union lever;

Fig. 9 is the enlarged drawing of ball and cocket joint;

Figure 10 is the appearance of ball and cocket joint is looked up in expression from the below a block diagram;

Figure 11 is the section-drawing along XI-XI line among Fig. 9;

Figure 12 will omit the figure of the corresponding expression with Fig. 9 of state of spherical shell;

Figure 13 is the block diagram of the appearance of the expression ball and cocket joint cap of looking up ball and cocket joint from the below;

Figure 14 will omit the section-drawing of the corresponding expression with Figure 11 of state of spherical shell;

Figure 15 is the block diagram of spherical shell;

Figure 16 is the section-drawing of universal coupling;

Figure 17 is the block diagram that the secondary of expression one form locks the lock-out state of (second lock) mechanism;

Figure 18 is the block diagram of disarm state of the secondary lockout mechanism of expression one form;

Figure 19 is the block diagram of lock-out state of the secondary lockout mechanism of other form of expression;

Figure 20 is the block diagram of disarm state of the secondary lockout mechanism of other form of expression;

Figure 21 is that expression is from the inboard block diagram of observing the state of rear wheel support of overall width direction;

Figure 22 is the in-built figure of expression rear wheel support;

Figure 23 is the figure that near the structure the fulcrum of seat framework in the first connecting rod mechanism and backrest framework is amplified expression;

Figure 24 is the figure of the main locking mechanism of expression vehicle body when being in limited in rotation between running condition and seat framework and the backrest framework;

Figure 25 is the figure that the state of removing the position is operated Lock Part from Figure 24 in expression;

Figure 26 is expression makes the main locking mechanism midway that seat framework and backrest framework rotate between running condition and folded state figure;

Figure 27 is that the expression vehicle body is in folded state, and the figure of the main locking mechanism the during limited in rotation between seat framework and the backrest framework;

Figure 28 is the block diagram that operating portion and handle in the setting of the upper end of hand push framework are amplified expression;

Figure 29 is the vertical direction section-drawing that the inside of expression handle installation portion constitutes;

Figure 30 is the horizontal cross-sectional view that the inside of expression handle installation portion constitutes;

Figure 31 is the block diagram of the main portion of expression handle folding mechanism;

Figure 32 omits the backrest framework and the in-to-in block diagram of representing installation portion;

Figure 33 is the figure that expression is installed to the appearance of handle installation portion with the slide block and the cliding gear of handle folding mechanism;

Figure 34 is that expression is with the slide block of handle folding mechanism and the block diagram of the state after the cliding gear combination;

Figure 35 is the figure of expression with the state after the engagement releasing of gear ring and cliding gear;

Figure 36 A is the figure of expression appearance that the handle approximate horizontal was fallen;

Figure 36 B is the figure of expression with appearance folded inverted about the handle;

Figure 37 is the figure that is illustrated in the remote handling gear that the operating portion of hand push framework is provided with;

Figure 38 amplifies the figure of expression with the forward foot in a step and front-wheel;

Figure 39 is the figure that pulls down leg rest (leg rest) the expression forward foot in a step and front-wheel;

Figure 40 is the exploded perspective view of Caster;

Figure 41 is the right side view of Caster retainer;

Figure 42 is the upward view of Caster retainer;

Figure 43 is the right side view of Caster main body;

Figure 44 is the birds-eye view of Caster main body;

Figure 45 is the right side view of slide block;

Figure 46 is the back view of slide block;

Figure 47 is the birds-eye view of slide block;

Figure 48 is the figure of the state of the Caster of expression when allowing the rotation of front-wheel;

Figure 49 is the figure of the state of the Caster of expression when stoping the rotation of front-wheel;

Figure 50 is the figure of the size of expression vehicle body each several part.

The specific embodiment

Fig. 1 is the block diagram of the perambulator of a mode of the present invention.At first, the integral structure to perambulator 1 describes.Perambulator 1 possesses vehicle body 2 and is supported in the seat 3 of this vehicle body 2.Vehicle body 2 possesses the forward foot in a step 4, a pair of rear foot (only showing one-sided among Fig. 1) 5, pair of armrests 6, a pair of seat framework 7, hand push framework 8.The forward foot in a step 4 has a pair of forward foot in a step framework 9.Forward foot in a step framework 9 uses hollow tubular product to form, and their bottom is compiled in left and right directions (the being also referred to as the overall width direction sometimes) central authorities of vehicle body 2, and in its lower end front-wheel 10 is installed.Lower end separately at the rear foot 5 is equipped with trailing wheel 11.Front-wheel 10 has the structure with the coaxial binding of a pair of tire 10a by axletree 10b.The distance in axial direction between the tire 10a is little more a lot of than the distance of 11 of trailing wheels.Thus, front-wheel 10 comes down to constitute as the mono-wheel.That is, perambulator 1 constitutes as possessing three wheeled perambulators of mono-front-wheel 10 and pair of rear wheels 11.Front-wheel 10 with upper and lower to axis be that the center is rotatable, its detailed construction aftermentioned.

Seat 3 possesses seat cushion portion 12 and spinal support portion 13.Seat cushion portion 12 and spinal support portion 13 have by alleviate impacting with liner, skin material etc. and cover respectively structure as the resin system substrate (seat board or backboard) of core.Each substrate of seat cushion portion 12 and spinal support portion 13 links by hinge 14 each other rotationally each other as different component set-ups.The axis of hinge 14 is towards the left and right directions of vehicle body 2.Seat cushion portion 12 supports from the below by the seat stay (seatstay) (not shown) that sets up between seat, left and right sides framework 7.On the other hand, the left and right sides backrest framework 15 of spinal support portion 13 part by constituting hand push framework 8 is by the left and right directions two-side supporting.Backrest framework 15 its total lengths are made of hollow tubular product.Hand push framework 8 not only possesses above-mentioned backrest framework 15, but also possesses operating portion 16 that disposes between these backrest framework 15 upper ends and the handle 17 that is installed on this operating portion 16.9 of forward foot in a step frameworks in the forward foot in a step 4 are equipped with resinous leg rest 18.In addition, on perambulator 1, also be provided with appurtenanceies such as anti-dazzle device, but their diagram is omitted.Secondly, describe the each several part of perambulator 1 in order in detail.

(connecting rod mechanism of vehicle body) at first describes the connecting rod mechanism of vehicle body 2 distortion to being used to.Fig. 2 is the lateral plan of the one-sided formation of the left and right directions (Width) of expression vehicle body 2.Need to prove that opposition side also is same formation.Left and right directions is equivalent to the fore-and-aft direction of vehicle body 2 among Fig. 2, is equivalent to left and right directions (being called the overall width direction sometimes) with the direction of paper quadrature, and the left side is equivalent to the place ahead of vehicle body 2 among Fig. 1.The above-below direction of vehicle body 2 is consistent with above-below direction among Fig. 1.As can be seen from Figure 2, the leading section of handrail 6 is that the center links with the upper end of forward foot in a step framework 9 rotationally with fulcrum Pa, and the rearward end of handrail 6 is rotated binding freely via fulcrum Pb with backrest framework 15.At the fixed seating midway of forward foot in a step framework 9 framework carriage 22, this seat framework carriage 22 is that the center links with the front end of seat framework 7 rotationally with fulcrum Pc.The rear end of seat framework 7 is that the center links parts 23 bindings with the connecting rod that is fixed in backrest framework 15 lower ends rotationally with fulcrum Pd.Thus, form the tetragonal first connecting rod L1 of mechanism of almost parallel respectively in the both sides of vehicle body 2.By operating the L1 of this first connecting rod mechanism, vehicle body 2 can be out of shape between running condition shown in Figure 2 and folded state shown in Figure 3.Need to prove that what describe among Fig. 3 is that the shade Hd that installs also is in folding state on backrest framework 15.The appearance that Fig. 4 will make vehicle body 2 change to folded state from running condition is divided into a plurality of stages and represents.In addition, Fig. 5 is the mechanism map after the L1 of first connecting rod mechanism is simplified.Need to prove, among Fig. 5, the L1 of first connecting rod mechanism when representing running condition, the L1 of first connecting rod mechanism when imaginary line is represented folded state by solid line.For ease of explanation, the position of forward foot in a step framework 9 is constant between two condition.

From Fig. 4 and Fig. 5 as can be seen, the following effect of the L1 of first connecting rod mechanism, along with vehicle body 2 from the variation of running condition to folded state, make seat 3 folding, and the backrest framework 15 of hand push framework 8 moved downwards almost parallel around this hinge 14 (with reference to Fig. 1).With the folding operation interlock of the L1 of first connecting rod mechanism, the rear foot 5 and trailing wheel 11 are to the forward foot in a step 4 displacements.The action of the rear foot 5 realizes by the afterwards described second connecting rod L2 of mechanism.

Fig. 6 A is the forward foot in a step 4 of expression vehicle body 2 when being in running condition and the lateral plan of the relation of the rear foot 5, and Fig. 7 A is the forward foot in a step 4 of expression vehicle body 2 when being in folded state and the lateral plan of the relation of the rear foot 5.As shown in these figures, the rear foot 5 possesses upper arm 25 and underarm 26 as a pair of rear foot arm.The almost parallel ground configuration each other of upper arm 25 and underarm 26 is worked as the linkage component that constitutes the second connecting rod L2 of mechanism.With regard to last underarm 25,26, at their front end, be that the center links with rear foot carriage 27 rotationally with fulcrum Qa, Qb, be that the center links with rear wheel support 28 rotationally in the rear end with fulcrum pin Qc, Qd.By underarm on these 25,26, rear foot carriage 27, and rear wheel support 28 form the tetragonal second connecting rod L2 of mechanism of almost parallel.For making L1 of first connecting rod mechanism and the L2 of second connecting rod mechanism concerted action, the upper arm 25 of the seat framework 7 of the L1 of first connecting rod mechanism and the L2 of second connecting rod mechanism is connected to each other via union lever 30.By the operation first connecting rod L1 of mechanism, the action of this seat framework 7 passes to upper arm 25 via union lever 30, makes the L2 of second connecting rod mechanism action.

The constitution diagram of the rear foot 5 about the constitution diagram of the rear foot 5 about Fig. 6 B is expression when the length direction of forward foot in a step framework 9 is overlooked vehicle body 2 and is in running condition, Fig. 7 B are expressions when the length direction of forward foot in a step framework 9 is overlooked vehicle body 2 and is in folded state.From these figure as can be seen, rear foot carriage 27 is installed on the rear foot stay 31 that is set up between the forward foot in a step framework 9.Rear foot stay 31 utilizes connecting elements 32 (with reference to Fig. 6 A and Fig. 7 A) such as rivet to be fixed on the forward foot in a step framework 9.Thus, rear foot carriage 27 is with respect to the forward foot in a step 4 displacement relatively.Rear foot carriage 27 is with respect to fore-and-aft direction centre line C L (with the line of vehicle body 2 along overall width direction five equilibrium) the left and right symmetrically configuration of vehicle body 2.Last underarm 25,26 (only representing upper arm 25 among Fig. 6 B and Fig. 7 B) with respect to the rotary centerline Aq of rear foot carriage 27 with respect to the oblique inclination of overall width direction, make than overall width direction inboard, make the place ahead and the top deflection of lateral vehicle body 2.Rotary centerline Aq makes the line of centers of underarm 25,26 when fulcrum Qa, Qb rotate.

By rotary centerline Aq is tilted, the rear foot 5 extends to the overall width direction outside obliquely from rear foot carriage 27.Thus, the distance of the overall width direction of trailing wheel 11 (direction of trailing wheel axis Aw) is bigger than the distance of the overall width direction of 27 on rear foot carriage.And the distance that trailing wheel is 11 the rear foot 5 reduces to forward foot in a step framework 9 one side joints closely more around rotating line of centers Aq.Therefore, the distance that trailing wheel is 11 is maxim Da (Fig. 6 B) when vehicle body 2 is in running condition, is minimum value Dd (Fig. 7 B) when vehicle body 2 is in folded state.Thus, under folded state, trailing wheel 11 is drawn into overall width direction inboard, thereby vehicle body 2 can be converged compactly in the overall width direction.Need to prove, though the rear foot 5 with respect to the oblique inclination of fore-and-aft direction centre line C L, by rear wheel support 28, the axletree 11a of trailing wheel 11 also can be supported with the overall width direction under running condition abreast.Because the L2 of second connecting rod mechanism constitutes as the tetragonal connecting rod mechanism of almost parallel, so even vehicle body 2 is folded, the axletree 11a of trailing wheel 11 also is supported abreast with the overall width direction.Therefore, be not only running condition,, transport while also can utilize front-wheel 10 and trailing wheel 11 to promote perambulator 1 even under folded state.Need to prove that only otherwise the action of trailing wheel 11 is caused obstacle, the axletree 11a of trailing wheel 11 also can tilt a little with respect to the overall width direction.In the present embodiment, switch running condition and folded state owing to move, so, also handle 17 can be maintained higher position even under folded state with making backrest framework 15 almost parallels.Therefore, the user just can operate hand push framework 8 on one's feet and make vehicle body 2 distortion.That is, can not force this factitious posture of squatting down to the user.Even folded state also can be held handle 17 and promote perambulators 1 and advance and transport.

Need to prove,, utilize various hookup mechanisms beyond the pin that linkage component is rotated freely each other and link going up separately of fulcrum Qa～Qd of fulcrum Pa～Pd, the L2 of second connecting rod mechanism of the L1 of first connecting rod mechanism.

(union lever and link structure) secondly illustrates union lever 30 and is used for structure with its binding.Fig. 8 is the figure that near the amplification of union lever 30 is represented.As mentioned above, union lever 30 links the upper arm 25 of the seat framework 7 and the rear foot 5, but because the rotary centerline of seat framework 7 is parallel with the overall width direction, relative therewith, the rotary centerline of upper arm 25 as above tilts like that, therefore, and between the point of contact of union lever 30 and seat framework 7 and upper arm 25, also produce relative displacement not only at the fore-and-aft direction and the above-below direction of vehicle body 2, and in the overall width direction.For allowing three so axial relative displacements, between union lever 30 and seat framework 7 and upper arm 25, Hooke's coupling is set.That is, union lever 30 and seat framework 7 link via ball and cocket joint 35, and union lever 30 and upper arm 25 link via universal coupling 36.

Fig. 9 is the enlarged drawing of ball and cocket joint 35, and Figure 10 is the block diagram from beneath ball and cocket joint 35, and Figure 11 is the section-drawing along XI-XI line among Fig. 9.As shown in these figures, ball and cocket joint 35 possesses the pedestal 37 that is fixed on the seat framework 7, is covered in spherical shell 38 on this pedestal 37, is built in the ball 39 in the spherical shell 38.Also as Figure 12～shown in Figure 14, on pedestal 37, be provided with mounting hole 37b and ball and cocket joint cap 37c that upper flange (topflange) 37a, seat framework 7 pass through.Be formed with the spigot surface 37d that bends to dome shape in the lower end of ball and cocket joint cap 37c.As Figure 11 and shown in Figure 15, spherical shell 38 is provided with the cylindrical portion 38a of the periphery that is embedded in ball and cocket joint cap 37c, and week is formed with the spigot surface 38b that bends to dome shape in the lower end side of this cylindrical portion 38a.As Figure 11 and shown in Figure 14, ball 39 utilizes countersunk head cap screw 40 to be fixed in the shaft end of union lever 30 coaxially.

In order to utilize ball and cocket joint 35 that union lever 30 and seat framework 7 are linked, at first ball 39 is fixed in union lever 30.In this stage, on union lever 30, pass spherical shell 38 in advance.And, as Figure 11 and shown in Figure 12, make ball 39 be contacted with the spigot surface 37d of ball and cocket joint cap 37c.Secondly, spherical shell 38 is embedded in the periphery of ball and cocket joint cap 37c.Then, squeeze into rivet 41 and make its side run through pedestal 37 and seat framework 7, and the opposition side that the leading section of this rivet 41 leads to spherical shell 38 is riveted processing from ball and cocket joint cap 37c.Thus, the state that is sandwiched between spigot surface 37d, the 38b with ball 39 links union lever 30 and seat framework 7.By ball 39 is slided along spigot surface 37d, 38b, union lever 30 can be around the center-point displacement freely of ball 39.

Figure 16 is the section-drawing that is used for universal coupling 36 that union lever 30 and upper arm 25 are linked.Universal coupling 36 has by pin 43 and rotates second connecting piece 45 that is installed in first connecting piece 44 of the U word shape on the upper arm 25 freely and is disposed at these first connecting piece, 44 inboards.Union lever 30 is in the inboard and pin 43 arranged coaxial of second connecting piece 45.At the outer side covers cover body 46 of first connecting piece 44, this cover body 46, second connecting piece 45 and union lever 30 are connected to each other by pin 47.Second connecting piece 45 and union lever 30 rotate freely around pin 47 with respect to first connecting piece 44, and first connecting piece 44 rotates freely around pin 43 with respect to upper arm 25.Therefore, union lever 30 is with respect to the axis freely displacement of upper arm 25 around pin 43,47 these two pins.Need to prove, show that universal coupling 36 is installed on the surface in the overall width direction outside of upper arm 25 from Fig. 8.

As mentioned above, by between the both ends of union lever 30 and seat framework 7 and upper arm 25, ball and cocket joint 35 and universal coupling 36 being set, between the point of contact of tolerable union lever 30 and two frameworks 7,25 in three axial displacements, thereby connecting rod action can be delivered to upper arm 25 sleekly from seat framework 7.In addition, in ball and cocket joint 35, because for just ball 39 is clipped in the ball and cocket joint cap 37c of pedestal 37 and the easy structure between the spherical shell 38, slipper between parts only collects in a position between ball 39 and spigot surface 37d, the 37b, so can cut down number of components, this is favourable to miniaturization, lightweight.By compiling slipper, the action of union lever 30 is also slick and sly.By form ball and cocket joint cap 37c by soft raw MAT'L, also can give ball and cocket joint 35 and alleviate the function of impacting.In addition, ball 39 and union lever 30 are linked,, can easily give the intensity that ball and cocket joint 35 can tolerate the folding effect of vehicle body 2 so make countersunk head cap screw 40 big footpathizations easily owing to make countersunk head cap screw 40 connect ball 39.In this embodiment, the combination of union lever 30, ball and cocket joint 35 and universal coupling 36 is equivalent to the connecting rod hookup mechanism.In addition, also ball and cocket joint 35 can be disposed at upper arm 25 1 sides, universal coupling 36 is disposed at seat framework 7 one sides.Also can be at the both ends of union lever 30 configuration ball and cocket joint 35.

Secondly (secondary lockout mechanism) describes the secondary lockout mechanism of vehicle body 2.As shown in Figures 2 and 3, be fixed with semi-girder 50, so that backrest framework 15 prolongs downwards in the bottom of backrest framework 15.On the backrest framework 15 about semi-girder 50 is installed in, with backrest framework 15 displacement integratedly.As Figure 17 and shown in Figure 180, about semi-girder 50 between (only showing one-sided among the figure) set up seat stay 51.Seat stay 51 is with the not shown seat stay concerted action that is set up in 7 of seat frameworks, from below supporting seat cushion 12 (with reference to Fig. 1) of portion.And, between the upper arm 25 of the seat stay 51 and the rear foot 5, be provided with secondary lockout mechanism 52.The purpose that secondary lockout mechanism 52 is set is, it is with main locking mechanism shown in Figure 24 70 concerted actions, rocking when being used to reduce vehicle body 2 and being in running condition, and it is equivalent to lockout mechanism between connecting rod.For main locking mechanism 70 aftermentioneds.

When secondary lockout mechanism 52 is in running condition at vehicle body 2, the block (block) 53 that is fixed in seat stay 51 two ends is contacted with the fixed jaw 55 that utilizes rivet 54 to be fixed on the upper arm 25, limit from length direction the place ahead (right-hand the figure) of framework 25.In addition, by use the lock slider 56 adjacent with fixed jaw 55 from the top and the place ahead hold this block 53 tightly, the backrest framework 15 and the rear foot 5 are limited mutually.Lock slider 56 is installed in the slotted hole 25a of upper arm 25 by utilizing pin 56a, thereby it is configured to can slide on the length direction of framework 25 along this slotted hole 25a.Dispose control lever 57 at the rear of lock slider 56, this control lever 57 is with respect to upper arm 25, is that rotating operation can be carried out in the center between the releasing position of the latched position of Figure 17 and Figure 18 with pin 58.Be provided with the not shown spring installation of lock slider 56 in the inside of upper arm 25, between lock slider 56 and control lever 57, dispose the linkage (not shown) such as steel wire, connecting rod mechanism that is used for lock slider 56 is drawn in the length direction rear of framework 25 to the place ahead of framework 25 application of force.When the latched position of control lever 57 being operated among Figure 17, utilize this linkage part that lock slider 56 is pulled to the position of Figure 17, make block 53 and lock slider 56 engagements.When the releasing position of control lever 57 being operated among Figure 18, shown in arrow F among the figure, lock slider 56 moves to length direction the place ahead of framework 25 under the effect of the power of spring installation, thus, block 53 is discharged from lock slider 56.That is, when setting vehicle body 2 is running condition, control lever 57 is switched to latched position,, when folding vehicle body 2, control lever 57 is switched to the releasing position, block 53 is discharged from lock slider 56 by lock slider 56 limit stop 53.

Figure 19 and Figure 20 represent the alternate manner of secondary lockout mechanism 52.In this mode, replace Figure 17 and fixed jaw 55 and lock slider 56 shown in Figure 180, lock arm 59 is installed on upper arm 25.Lock arm 59 is identical with lock slider 56, is from the top and the structure of block 53 is embraced in the place ahead, but its position is a unmodified on upper arm 25.That is, lock arm 59 is fixed in the fixed position of upper arm 25.Lock arm 59 portion in its back-end possesses lock pawl 59a.Lock pawl 59a can be mobile in as shown in figure 19 outstanding position from upper arm 25 and retreating between position upper arm 25 in as shown in figure 20.And then between lock pawl 59a and control lever 57, dispose linkage, and if control lever 57 is switched to latched position, then lock pawl 59a moves to the position of Figure 19, if control lever 57 is switched to the releasing position, then lock pawl 59a moves to the position of Figure 20.In this mode, when establishing vehicle body 2, control lever 57 is switched to latched position for running condition, stop block 53 from the deviating from of lock arm 59 with lock pawl 59a, when folding vehicle body 2, control lever 57 switched to remove the position, lock pawl 59a is retreated, block 53 can be extracted from lock arm 59.

According to above secondary lockout mechanism 52, when vehicle body 2 was in running condition, upper arm 25 and backrest framework 15 by the semi-girder 50 binding rear feet 5 can significantly suppress rocking of vehicle body 2.When folding vehicle body 2, only, the control lever on the rear foot 5 57 removes the position by being switched to, just can remove the binding of backrest framework 15 and upper arm 25, it is easy therefore to operate transfiguration.And, when folding vehicle body 2, because the user is positioned at hand push framework 8 one sides, promptly is positioned at the rear of vehicle body 2, so can easily operate control lever 57.

(rear wheel support) secondly illustrates rear wheel support 28 with reference to Figure 21 and Figure 22.Rear wheel support 28 possesses rack body 60 and bearing seat 61.Rack body 60 links by the last underarm 25,26 of fulcrum Qc, Qd and the rear foot 5.On bearing seat 61, rotate the axletree 11a that trailing wheel 11 is installed freely.Rack body 60 and bearing seat 61 rotate freely via a connecting pin 62 and link.And then as shown in figure 22, between rack body 60 and bearing seat 61, be provided with buffer unit 63.Buffer unit 63 for example can utilize rubber.Replace rubber, also can utilize spring as buffer unit.By buffer unit 63 is built in rear wheel support 28, comes the impact of buffer action by buffer unit 63, thereby relax the impact of transmitting to the rear foot 5 in trailing wheel 11.Thus, impact and to be difficult to pass to hand push framework 8 or seat 3, the operation sense of perambulator 1 and take sensation and all improve.

(main locking mechanism) Figure 23 amplifies the figure of expression with near the structure the fulcrum Pd of the L1 of first connecting rod mechanism, and Figure 24～Figure 27 represents the main locking mechanism 70 around this fulcrum Pd setting.Need to prove that among Figure 23～Figure 25, vehicle body 2 is in running condition, among Figure 27, vehicle body 2 is in folded state.

Main locking mechanism 70 is set is for by stoping the rotational motion between pair of links parts contained among the first connecting rod L1 of mechanism, and vehicle body 2 is limited in running condition and folded state, main locking mechanism 70 is equivalent to lockout mechanism in the connecting rod.

As mentioned above, the connecting rod that is used for backrest framework 15 and 7 bindings of seat framework is installed in the bottom of backrest framework 15 and links parts 23.As shown in figure 23, connecting rod binding parts 23 utilize connecting pin 71 to be fixed on the backrest framework 15.The bottom that links parts 23 at connecting rod is formed with housing 23a.Figure 24～Figure 27 represents to pull down the main portion that connecting rod links the main locking mechanism 70 behind the parts 23.Rearward end at seat framework 7 also is provided with connecting rod binding parts 72, and this connecting rod links parts 72 and utilizes connecting pin 73 to be fixed on the seat framework 7.Link the guiding axial region 72a that forms the housing 23a inboard that is embedded in connecting rod binding parts 23 on the parts 72 at connecting rod.By on fulcrum Pd, linking this guiding axial region 72a and housing 23a freely, thus, seat framework 7 and backrest framework 15 are linked rotationally around fulcrum Pd via connecting pin 74 rotations.In the periphery of guiding axial region 72a, open distance along the Zhou Fangxiang sky and be provided with a pair of 72b of portion, the 72c of bearing.Bear the 72b of portion when being in running condition, opposed with the bottom of backrest framework 15, bear the 72c of portion when being in folded state, opposed with the bottom of backrest framework 15.

In addition, inserted Lock Part 75 freely in the slides within of backrest framework 15.

This Lock Part 75 is by the inner peripheral surface of backrest framework 15 and connecting pin 71 guiding, and can and retreat into than this latched position in latched position shown in Figure 24 (Figure 24 and position shown in Figure 27) and move between more by the releasing position (Figure 25 and position shown in Figure 26) in the backrest framework 15.When vehicle body 2 is in running condition, if make Lock Part 75 move to latched position, then as shown in figure 24, and Lock Part 75 and bear the 72b of portion engagement, connecting rod links parts 23,72 and can not relatively rotate around fulcrum Pd, thus vehicle body 2 is limited in running condition.As shown in figure 25, if move Lock Part 75 to the releasing position, vehicle body 2 is changed to folded state, then as shown in figure 26, Lock Part 75 relatively moves in the periphery of guiding axial region 72a.And if make Lock Part 75 move to latched position under folded state, then as shown in figure 27, Lock Part 75 meshes with bearing the 72c of portion, can not relatively rotate around fulcrum Pd thereby connecting rod links parts 23,72, thus vehicle body 2 is limited in folded state.From folded state when running condition is switched, the operational lock parts 75 too.

Be provided with the spring installation (not shown) of Lock Part 75 being pressed to latched position in the inside of backrest framework 15.Steel wire 76 as transfer device is installed in the upper end of Lock Part 75.If this steel wire 76 is pulled to the top, then Lock Part 75 antagonism spring installations move to removing the position from latched position.Steel wire 76 via the inside of backrest framework 15 around operating portion 16 (with reference to Fig. 1) to the upper end of hand push framework 8.

(structure around the handle) then describes operating portion 16 and handle 17 in the setting of the upper end of hand push framework 8.As shown in figure 28, on operating portion 16, be provided with housing 80.Handle 17 forms according to the mode that is depicted in the long flat ring-type of overall width direction, is provided with in its lower end in the overall width direction across housing 80 and a pair of installation portion 17a of configuration.The inside that installation portion 17a is inserted into housing 80 is run through in the upper end of backrest framework 15.Between installation portion 17a and backrest framework 15, be coated with end pipe (end tube) 81.Center upper portion at handle 17 is formed with the handle portion 17b that the user holds.

Figure 29 is the vertical direction section-drawing that the inside of expression installation portion 17a constitutes, and Figure 30 is the horizontal cross-sectional view that the inside of expression installation portion 17a constitutes.From these figure as can be known, on installation portion 17a, be provided with handle folding mechanism 82.Figure 31 is the block diagram of the main portion of expression handle folding mechanism 82, and Figure 32 omits the in-to-in block diagram that backrest framework 15 is represented installation portion 17a.Only express the in-to-in handle folding mechanism 82 of the installation portion 17a of a side among these figure, but on the installation portion 17a of opposite side, be provided with the handle folding mechanism 82 of same formation symmetrically along the overall width direction.

Show that from Figure 29～Figure 32 handle folding mechanism 82 possesses: the in-to-in gear ring 83 that is fixed on housing 80 with the state of arranged coaxial on the periphery of backrest framework 15; Be accommodated in the inside of installation portion 17a with the state that slides freely and rotate the periphery that is disposed at backrest framework 15 freely, and can with gear ring 83 ingear cliding gears 84; According to pushing the coil spring 85 of this cliding gear 84 with gear ring 83 ingear modes; And the slide block 86 that is disposed at the periphery of installation portion 17a.As Figure 33 and shown in Figure 34, slide block 86 has the roughly shape of U word shape, is provided with one within it week and rotates transmission pawl 86a and two thrust pawl 86b.On installation portion 17a, be formed with the through hole 17c that these pawls 86a, 86b pass through.By with pawl 86a, 86b inside, slide block 86 is embedded in the periphery of installation portion 17a from through hole 17c insertion installation portion 17a.In the inside of installation portion 17a, it is chimeric rotate to transmit pawl 86a and cliding gear 84, but and on Zhou Fangxiang unitary rotation, thrust pawl 86b and cliding gear 84 are chimeric, and in axis direction displacement relatively (with reference to Figure 34).

Therefore, when slide block 86 was operated outside the overall width direction along installation portion 17a, cliding gear 84 moved to same direction on backrest framework 15, with the engagement releasing (with reference to Figure 35) of cliding gear 84 and gear ring 83.When at this state lower edge Zhou Fangxiang operation slide block 86, installation portion 17a and slide block 84 lean around back of the body framework 15 unitary rotation, and thus, handle 17 is with respect to the tilt variation of backrest framework 15.In Fig. 1 and Fig. 2, side from vehicle body 2, backrest framework 15 and handle 17 are along roughly straight line arrangement, but shown in Figure 36 A, also handle 17 can be fallen to the horizontal direction rear from backrest framework 15, and then shown in Figure 36 B, the behind to backrest framework 15 also handle 17 can turned back is up to swinging to up and down.Handle 17 among Fig. 3 is corresponding with the state of Figure 36 B.By the handle 17 that turns back like this, the height of the perambulator 1 in the time of can further reducing to fold vehicle body 2.Beyond the position shown in Figure 36 A or Figure 36 B, the inclination of handle 17 also can the suitable setting according to user's hobby.The bevelled resolution is that the angle that is equivalent to a pitch of gear 83,84 is a least unit.

As shown in figure 37, be provided with remote handling gear 90 in the inside of housing 80.

Remote handling gear 90 is the mechanisms of position that are used to switch the Lock Part 75 of above-mentioned main locking mechanism 70.Remote handling gear 90 possesses following structure: pulley 91 is configured to rotate around its 91a, make the drive pin 91b on this pulley 91 chimeric, fixed the end of steel wire 76 simultaneously in the periphery of pulley 91 with the operation pawl 92a of the operation slide block of giving prominence to the below of housing 80 92.When operation slide block 92 was carried out push operation upward, pulley 91 rotated around axle 91a, follows this rotation, and steel wire 76 is wound on the periphery of pulley 91, the Lock Part 75 in the backrest framework about being built in 15 is pulled to remove the position.Need to prove, lock slider 93 is installed in the periphery of housing 80.When lock slider 93 was positioned at the position of Figure 37, the lock arm 93a of lock slider 93 costed the operation pawl 92a of operation slide block 92, thereby can not operate the push operation of slide block 92.When the arrow directions X was operated in Figure 37 with lock slider 93, the engagement of lock arm 93a and operation pawl 92a was disengaged, and can operate the push operation of slide block 92.

As mentioned above, in the manner, handle 17 is rotated binding freely with respect to backrest framework 15, and the operating unit ( slide block 86,92,93) of handle folding mechanism 82 and remote handling gear 90 concentrated on the operating portion 16 of 15 of backrest frameworks, the handle portion 17b of handle 17 is arranged on position away from operating portion 16.Therefore, get rid of the operating unit of handle folding mechanism 82 and remote handling gear 90 from handle portion 17b, thereby make handle portion 17b be positioned at the central authorities of overall width direction.Thus, the user can easily hold handle portion 17b in overall width direction central authorities, even under the situation with one-handed performance perambulator 1, also can access comfortable operation sense.Owing to do not need to guarantee handle portion 17b, so the Design freedom relevant with the layout of the operating unit ( slide block 86,92,93) of handle folding mechanism 82 and remote handling gear 90 also improves 15 of backrest frameworks.

Secondly (installation constitution of the forward foot in a step and front-wheel) describes the installation constitution of the forward foot in a step 4 and front-wheel on the other side 10.Figure 38 amplifies the figure of expression with the forward foot in a step 4 and front-wheel 10, and Figure 39 is the figure that pulls down the leg rest 18 expression forward foot in a step 4 and front-wheel 10.As mentioned above, the forward foot in a step 4 has the structure of the bottom of compiling a pair of forward foot in a step framework 9.As can be seen from Figure 39, combination is carried out by the connecting pin 100 that has utilized rivet etc. in the bottom of forward foot in a step framework 9, at this bound fraction front-wheel 10 is installed via Caster 101.Also as shown in figure 40, Caster 101 possesses: Caster retainer 102, the slide block 104 that is assemblied in the Caster main body 103 of Caster retainer 102 belows and overlaps configuration with the front face side of Caster retainer 102 and Caster main body 103.

Also as Figure 41 and shown in Figure 42, Caster retainer 102 possesses: the contracted barrel-contoured framework of lower end side bears portion 105 and bears outstanding bearing portion 106 of portion 105 downwards from this framework.Bear at framework and to be formed with the pin mounting hole 105a that runs through Caster retainer 102 along the overall width direction in the portion 105.About bearing portion 106, be formed with along the vertical direction the rail groove 106a that extends,, be provided with two location indentations 106b, 106c in that above-below direction is spaced apart at the rear of these rail grooves 106a.As can be seen from Figure 42, in bearing portion 106, be provided with along the vertical direction and extend and at the bearing hole 106d of the lower aperture of Caster retainer 102.The line of centers of bearing hole 106d is equivalent to the rotary centerline of Caster 101.

Also as Figure 43 and shown in Figure 44, the wheel installation portion 109 that Caster main body 103 possesses bearing portion 108 and links with the rear of this bearing portion 108.About bearing portion 108, be formed with the rail groove 108a that extends at above-below direction, be formed with tapering 108b at the rear of these rail grooves 108a.And then also as shown in figure 40, extend and the bearing hole 108c of opening on bearing portion 108 being provided with in the bearing portion 108 along the vertical direction.The line of centers of bearing hole 108c is also consistent with the rotary centerline of Caster 101.Above-mentioned tapering 108b is inclined to its upper end side more is partial to Caster main body 103 than lower end side rear (right-hand among Figure 43).On wheel installation portion 109, be formed with the axletree mounting hole 109a that Caster main body 103 is run through along its left and right directions.Axletree mounting hole 109a is the long hole shape of extending at above-below direction.The axletree 10b of front-wheel 10 (with reference to Fig. 1 and Figure 39) is by being installed in axletree mounting hole 109a, thereby the state can move on above-below direction in the inside of axletree mounting hole 109a is rotated and is supported on Caster 101 freely.The mitigation of packing in the inside of wheel installation portion 109 is alleviated mechanism (not shown) in the impact of the impact of axletree 10b.Alleviate mechanism by impacting, axletree 10b quilt is the application of force downwards, corresponding to the load displacement upward from front-wheel 10 inputs.

As Figure 45～shown in Figure 47, slide block 104 has crooked slider body 104a, and this slider body 104a constitutes the part of cylinder, utilizes the elasticity of this slider body 104a to be embedded in the periphery of the bearing portion 106 of Caster retainer 102.Be provided with operation flange 104b in the upper end of slider body 104a.The pair of guide rails 104c that extends along the vertical direction that is formed with in interior week at slider body 104a.Be provided with location protuberance 104d at the Zhou Fangxiang two ends of slider body 104a, the location is side-prominent to the interior week of slider body 104a with protuberance 104d.In addition, be formed with 108b ingear tapering, tapering 104e with Caster main body 103 in the both sides, lower end of slider body 104a.

Return Figure 40, it is center combination rotationally mutually that Caster retainer 102 and Caster main body 103 are passed through with fulcrum pin 110 insertion their bearing hole 106d (with reference to Figure 42), 108c and with fulcrum pin 110.Slide block 104 is embedded in the front periphery of the bearing portion 106 of Caster retainer 102, so that its guide rail 104c and rail groove 106a engagement.Between the both ends and Caster retainer 102 and Caster main body 103 of fulcrum pin 110, for example carry out anti-avulsion respectively by the gimmick of chimeric slotted ring (snapring) on fulcrum pin 110 etc.As the anti-avulsion device of the either side of Caster retainer 102 or Caster main body 103, also can flange be set in the end of the either side of fulcrum pin 110.

As shown in figure 39, Caster 101 links with the lower end of the forward foot in a step 4 in the following way, promptly, bear the bottom that the forward foot in a step framework 9 that is combined by connecting pin 100 is inserted in the inside of portion 105 at the framework of its Caster retainer 102, connecting pin 107 is run through the opposition side that forward foot in a step framework 9 is driven into pin mounting hole 105 from the side of pin mounting hole 105a.Under this state, Caster retainer 102 and slide block 104 can not link on Zhou Fangxiang rotationally with respect to the forward foot in a step 4.On the other hand, Caster main body 103 is allowing with fulcrum pin 110 to be that the state and stoping between the state that rotates of rotation at center switches according to the position of slide block 104.

That is, slide block 104 meshes by the rail groove 106a that makes its guide rail 104c and Caster retainer 102, thereby can move on above-below direction along rail groove 106a, and can not relatively rotate at Zhou Fangxiang with respect to Caster retainer 102.The rail groove 108a of Caster main body 103 is provided in and makes front-wheel 10 when working direction, in other words, when the axletree 10b that makes front-wheel 10 is consistent with the overall width direction, is one with the rail groove 106a of Caster retainer 102 and links to each other point-blank.Figure 48 represents rail groove 106a, 108a have been carried out the state of contraposition.In the state of Figure 48, owing to slide block 104 integral body are positioned in the bearing portion 106 of Caster retainer 102, so Caster main body 103 is rotatable.But, when with slide block 104 when the state of Figure 48 is operated downwards, the part of the guide rail 104c of slide block 104 embeds the rail groove 108a of Caster main body 103, and as shown in figure 49, slide block 104 is across 106,108 in the bearing portion separately of Caster retainer 102 and Caster main body 103.Thus, tapering 108b, the 104e engagement separately of Caster main body 103 and Caster 104, Caster main body 103 can not be rotated with respect to Caster retainer 102.Consequently, front-wheel 10 is limited in towards the state that directly advances direction.That is, Figure 48 is equivalent to allow the state of the rotation of front-wheel 10, and Figure 49 is equivalent to stop the state of the rotation of front-wheel 10.Need to prove, under the state of Figure 48, the recess 106b of the protuberance 104d of slide block 104 and the upside of Caster retainer 102 engagement, under the state of Figure 49, the recess 106c of protuberance 104d and downside engagement.

Under the state of Figure 49, effect has when being the torque at center with fulcrum pin 110 on front-wheel 10, between tapering 108b, 104e, produces component Fc on the direction of electing slide block 104 along the axis direction of fulcrum pin 110.If this component Fc surpasses the regulation boundary, then the protuberance 104d of slide block 104 deviates from from the recess 106c of Caster retainer 102, and slide block 104 is elected in the bearing portion 106 of Caster retainer 102.Consequently Caster main body 103 can be rotated around fulcrum pin 110.Therefore, because the torque that goes beyond the limit is in slide block 104, so eliminated the distortion of slide block 104 or the misgivings that damaged such unfavorable condition produces.

Structure according to the above-mentioned forward foot in a step 4, by pair of right and left forward foot in a step framework 9 is converged in their bottom, mutually combine with connecting pin 100, constitute the forward foot in a step 4 thus, and then the barrel-contoured framework that Caster retainer 102 is inserted in this bottom of converging is born the inside of portion 105, solid altogether with Caster retainer 102, therefore, have following advantage.At first, when constituting the forward foot in a step 4, need and to be processed into roughly U word shape or V word shape by raw-material bending pipes by mono-tubing.With respect to this, in the manner, as long as left and right sides forward foot in a step framework 9 is carried out bending machining as individual components respectively, its angle of bend is also little.Therefore, can make forward foot in a step framework 9 easily.

Because by the bottom of two forward foot in a step frameworks 9 is converged, the linking portion that links with Caster 101 can be set integratedly in the bottom of the forward foot in a step 4, therefore, the binding parts that will be used to Caster 101 is installed engage with forward foot in a step framework 9 thereby needn't wait by welding as making with the parts of forward foot in a step framework 9 splits.Thus, can easily guarantee the rigidity of the linking portion of the forward foot in a step 4 and Caster 101, and also can realize the reduction of number of components.Lightweight to vehicle body 2 is also favourable.In addition, owing to making barrel-contoured framework, the connecting part with respect to the forward foot in a step 4 with Caster retainer 102 bears portion 105, and the bottom of the forward foot in a step of portion's insertion within it framework 9, therefore, compare with framework being born portion's flat situation of 105 formations, guarantee that easily framework bears the rigidity of portion 105.Therefore, 102 resinifications of Caster retainer can be made, thereby reduction of lightweight, manufacturing cost etc. can be realized.

(body dimensions) secondly illustrates the range of sizes of the best of vehicle body 2 with reference to Figure 50.Need to prove that what represent among Figure 50 is, vehicle body 2 is in running condition, and handle 17 is located in and state on a straight line roughly of the length direction of backrest framework 15 (following it is called normal condition).

In the perambulator 1 of the manner, front-wheel 10 is installed on the vehicle body 2 via Caster 101.Vertical direction line of centers (vehicle body rotary centerline) when therefore, the handle portion 17b that holds handle 17 rotates vehicle body 2 is positioned at hind axle line Aw (with reference to Fig. 6 B) on the fore-and-aft direction of vehicle body 2.If the force during hypothesis operation perambulator 1 is positioned at center (below the be called the handle center) Cg of the handle portion 17b of handle 17, then with respect to the fore-and-aft direction distance X c of this handle center C g and trailing wheel axis Aw, the back of the body seat intersection point Ci at seat 3 and the fore-and-aft direction distance X b of trailing wheel axis Aw are more little, and the axle base Xa that wheel is 10,11 is short more, and should be applied to power on the handle portion 17b (below be called rotating operation power) so for vehicle body 2 is rotated more little.That is, distance X a, Xb are more little with respect to the ratio separately of distance X c, and rotating operation power is more little.At this, back of the body seat intersection point Ci is the point that extended line of pulling out along the surface of the buffer part 12 at the seat 3 when trailing wheel axis Aw direction is observed vehicle body 2 and the extended line of pulling out along the surface of back-rest 13 intersect.The center-of-gravity position that acts on the body weight of the child on the seat 3 can be by back of the body seat intersection point Ci representative.

In addition, the height Za of back of the body seat intersection point Ci is more little with respect to the ratio of the height Zb of handle center C g, and is favourable more to the operability of vehicle body 2, and the height Za that reduces to carry on the back an intersection point Ci also is favourable to the stability of guaranteeing vehicle body 2.On the other hand, when setpoint distance Xc increase, distance X a, when Xb reduces, the stability decreases in the overall width direction of vehicle body 2 is particularly should tendency under three wheeled situations high.

If consider above thing, the height Za that then increase axle base Xa, reduces to carry on the back an intersection point Ci for realize rotating operation power alleviate with the stability of vehicle body 2 guarantee it is rational.Therefore, in the manner, each size of following setting.

(1), axle base Xa is set at not enough 2Xc, will carries on the back the scope that distance X b between seat intersection point Ci and trailing wheel axis Aw is set at 0.4Xc～0.6Xc with respect to the distance X c between handle center C g and the trailing wheel axis Aw.If axle base Xa is more than the 2Xc, the misgivings that then exist rotating operation power excessively to increase.When distance X b deficiency 0.4Xc, back of the body seat intersection point Ci is too near trailing wheel axis Aw, thus vehicle body 2 easy tilted rearward, and when distance X b surpassed 0.6Xc, rotating operation power may excessively increase.

(2) with respect to the height Zb of handle center C g, the height Za that carries on the back seat intersection point Ci is set at not enough 0.32Zb.If height Za is more than 0.32Zb, then the stability of vehicle body 2 goes beyond the limit and may worsen.

Need to prove, even enlarge the stability that the distance D a of 11 of trailing wheels under the running condition also can guarantee vehicle body 2.But if unrestrictedly enlarge trailing wheel 11, then vehicle body 2 transitable duct widths are restricted, and may cause usability to worsen.As a standard, preferably the ultimate range Da in the overall width direction with trailing wheel 11 is set at not enough 550mm.If not enough 550mm,, also can pass through at leisure with the state that keeps roomy trailing wheel 11 even then in the so narrow position of the path of automatic ticket checker.

When the buffer part 12 at seat 3 and back-rest 13 are applied bending,, then define a back of the body seat intersection point Ci as long as extend this planar portions if back of the body seat intersection point Ci has a planar portions in that buffer part 12 and back-rest 13 are residual.Under the situation that does not have clear and definite planar portions, perhaps since buffer part 12 and back-rest 13 covered by non-removable padded coaming or skin material, or there is not the such reason of substrate that should become core in buffer part 12 and back-rest 13 places, thereby can't define under the situation of back of the body seat intersection point Ci, as long as SG specification (gauge number CPSA0001) " the identification benchmark of perambulator and benchmark confirmation method " with Foundation's goods safety association, or the anchor clamps of angle that are used to measure seat surface and backrest of British specification EN1888:2003 regulation are located at seat 3, observe the face that these anchor clamps and seat buffer part 12 and spinal support portion 13 are joined from the side of vehicle body and prolong, their intersection point decision is got final product for a back of the body intersection point Ci.

In the perambulator 1 of the manner,, therefore set the size of vehicle body 2, to satisfy above-mentioned essential condition (1), (2) with above-mentioned normal condition owing to the angle that can change handle 17 with respect to the backrest framework 15 of hand push framework 8.When normal condition changes, also may produce the situation of any at least that can't satisfy in essential condition (1), (2) in the inclination of handle 17.But, essential condition (1), (2) are the stability when being used for obtaining simultaneously vehicle body 2 is rotated and the condition of operability, for example 2 of vehicle bodies are carried out under the situation of forward motion, also can not be subjected to the restriction of essential condition (1), (2), according to the suitably inclination of regulating handle 17 such as user's height, hobby.That is, as the manner, in can the bevelled perambulator of regulating handle, when any inclination that handle is set in its setting range, as long as satisfy essential condition (1), (2).

The present invention is not limited to above-mentioned embodiment, can implement in every way.For example, in aforesaid way, perambulator made possess, but the first connecting rod mechanism of vehicle body of the present invention and second connecting rod mechanism also can be applied to the perambulator that the overall width direction possesses the four-wheel-type of a pair of front-wheel at the mono-wheel of overall width direction central configuration with in three of the pair of rear wheels of overall width direction both sides configuration wheeled structures.For connecting rod hookup mechanism, secondary lockout mechanism (hookup mechanism between connecting rod), equally also applicable to the perambulator of four-wheel-type.For the structure that relief means is set in rear wheel support, can be applied to the perambulator of four-wheel-type, the perambulator that can also be applied to utilize the structure different that vehicle body is folded with above-mentioned first connecting rod mechanism, second connecting rod mechanism, and also can be applied to the rear wheel support of the perambulator that can not fold.Structure and Caster for the forward foot in a step, so long as have three wheeled perambulators of mono-front-wheel, the perambulator that just can be applied to utilize the structure different with above-mentioned first connecting rod mechanism, second connecting rod mechanism that vehicle body is folded also can be applicable to the perambulator that can not fold.

The present invention is not limited to above-mentioned embodiment, can implement in every way.For example, in the above-described embodiment, be provided with slide block 104, but also Lock Part can be accommodated in the inside of Caster retainer 102 as Lock Part in the periphery of Caster retainer 102.As the guide piece of Lock Part, on slide block 104, be provided with guide rail 104e, and be provided with rail groove 106a, but also can on the Caster retainer, guide rail be set, and on Lock Part, rail groove is set at Caster retainer 102.Guide piece also can suitably change to: for example it constitutes etc. by the pin that extends in the direction of rotary centerline with the chimeric pin-and-hole of this pin.Though on slide block 104, protuberance 104e is set as Lock Part, recess 106c is set on Caster retainer 102, also recess can be set on Lock Part, on the Caster retainer, protuberance is set.Can omit with releasing position (position of Figure 48) the corresponding concave part 106d of Lock Part.In addition, when Lock Part was positioned at latched position (position of Figure 49), even also can Lock Part be remained under the situation of latched position by suitable power at recess and protuberance engagement, these recesses and protuberance also can omit.In aforesaid way, perambulator made possess, but Caster of the present invention also can be applied to the perambulator of four-wheel-type at the mono-front-wheel of overall width direction central configuration with in three of the pair of rear wheels of overall width direction both sides configuration wheeled structures.Front-wheel not only, trailing wheel also can be used Caster of the present invention.In addition, Caster of the present invention is not limited to the example that the foot's (forward foot in a step or rear foot) at perambulator installs, and needs only the state that needs to switch the state of the rotation that stops wheel and allow rotation, just can be applied to the supporting construction of various wheels.

Claims (11)

1. a perambulator can be out of shape vehicle body between running condition and folded state, it is characterized in that possessing:

First connecting rod mechanism, it comprises the forward foot in a step of described vehicle body and hand push framework as linkage component, and observe to constitute approximate parallelogram from the overall width direction, make described vehicle body from described running condition during to described folded state distortion, described hand push framework moves downwards almost parallel;

Second connecting rod mechanism, it forms approximate parallelogram, comprise a pair of rear foot arm as linkage component, the mutual almost parallel of described a pair of rear foot arm ground configuration also constitutes the rear foot of described vehicle body, makes the fore-and-aft direction displacement of this rear foot at described vehicle body during described second connecting rod mechanism action;

The connecting rod hookup mechanism, it links described first connecting rod mechanism and described second connecting rod mechanism, make when making described vehicle body operate described first connecting rod mechanism to the distortion of described folded state from described running condition, action interlock with this first connecting rod mechanism, make the described rear foot towards described forward foot in a step displacement

Described first connecting rod mechanism and described second connecting rod mechanism wherein are set in the overall width direction both sides of described vehicle body.

2. perambulator as claimed in claim 1 is characterized in that,

Described second connecting rod mechanism makes described vehicle body during to described folded state distortion, make the described rear foot also to the inboard displacement of described overall width direction from described running condition.

3. perambulator as claimed in claim 1 is characterized in that,

Described second connecting rod mechanism comprise described a pair of rear foot arm, with respect to the described forward foot in a step relatively the rear foot carriage that is provided with of displacement ground, and the rear wheel support of supporting wheels as linkage component, an end separately and the rear foot carriage of described a pair of rear foot arm link rotationally, the other end separately and the described rear wheel support of described a pair of rear foot arm link rotationally, and described thus second connecting rod mechanism constitutes approximate parallelogram.

4. perambulator as claimed in claim 3 is characterized in that,

Described rear foot arm with respect to the oblique inclination of described overall width direction, makes that comparing the outside with described overall width direction inboard more is partial to vehicle body top and the place ahead with respect to the rotary centerline of described rear foot carriage.

5. perambulator as claimed in claim 4 is characterized in that,

Described rear wheel support under described running condition and described folded state with the axletree supporting of described trailing wheel is and described overall width direction almost parallel respectively.

6. as claim 4 or 5 described perambulators, it is characterized in that,

Described connecting rod hookup mechanism possesses: the union lever between the seat framework that is configured between the described forward foot in a step and the described hand push framework and works as the linkage component of described first connecting rod mechanism, the rear foot arm that is erected at the described seat framework and the described rear foot and be located at this union lever respectively and described seat framework between and the Hooke's coupling between this union lever and the described rear foot arm

At least one distolateral Hooke's coupling of described union lever is a ball and cocket joint.

7. as claim 2,4 or 5 described perambulators, it is characterized in that,

Bottom in the described forward foot in a step is equipped with the mono-front-wheel through Caster.

8. perambulator as claimed in claim 7 is characterized in that,

The described forward foot in a step has a pair of forward foot in a step framework of arranging in described overall width direction, the bottom separately of described a pair of forward foot in a step framework is to described overall width direction inside bend, and mutually combine in overall width direction central authorities, through described Caster described mono-front-wheel is installed in the bottom of this combination.

9. perambulator as claimed in claim 8 is characterized in that,

Have the Caster main body that described front-wheel is installed on the described Caster and be located between the described Caster main body and the described forward foot in a step and the Caster retainer of described Caster body abutment for rotating,

On described Caster retainer barrel-contoured framework is set and bears portion, the bottom that combines of described a pair of forward foot in a step framework is embedded in described framework and bears in the portion, and combines with this framework portion of bearing.

10. as each described perambulator in the claim 3～5, it is characterized in that,

Described rear wheel support has the rack body and the bearing seat that can link rotationally around the fulcrum parallel with described overall width direction with respect to this rack body that links with described a pair of rear foot arm,

Described trailing wheel is installed on the described bearing seat, is provided with relief means between described rack body and described bearing seat.

11. as each described perambulator in the claim 1～5, it is characterized in that,

Be provided with lockout mechanism between connecting rod, when it is in described running condition at described vehicle body, the described rear foot and the linkage component of described first connecting rod mechanism or the parts that combine with this linkage component one limited mutually.

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