GB2535630A

GB2535630A - Baby carriage and backrest angle adjusting device thereof

Info

Publication number: GB2535630A
Application number: GB1600715.5A
Authority: GB
Inventors: Guo Zheng-Wen; Wang Er-Xue; Zhang Xiao-Jian
Original assignee: Wonderland Nurserygoods Co Ltd Hong Kong
Current assignee: Wonderland Nurserygoods Co Ltd Hong Kong
Priority date: 2015-02-16
Filing date: 2016-01-14
Publication date: 2016-08-24
Anticipated expiration: 2036-01-14
Also published as: GB202014716D0; CN105984482B; CN105984482A; GB2584582B; DE102016201379A1; GB2584582A; GB2535630B; GB201600715D0

Abstract

A backrest angle adjusting device 30 adapted to a baby carriage includes a fixing base 31 and a driving base 32, wherein the fixing base is fixed on a frame 10, and the driving base is connected to a backrest 20 and capable of rotating with respect to the fixing base. The fixing base has at least two engaging grooves (fig 2, 310), wherein the engaging grooves are arranged in an arc shape to form a multi-stage structure. The driving base has a lock member (fig 2, 320) engaged with one of the engaging grooves (fig 2, 310). The engaging groove and the lock member are capable of engaging with each other at a predetermined angle, so as to lock the driving base 32 with respect to the fixing base 31. Accordingly, when the lock member disposed on the driving base is engaged with different engaging grooves of different stages, the angle of recline of the backrest with respect to the frame is different.

Description

BABY CARRIAGE AND BACKREST ANGLE ADJUSTING DEVICE THEREOF

Background of the Invention

1. Field of the Invention

The invention relates to a baby carriage and an adjusting device thereof and, more particularly, to a baby carriage and a backrest adjusting device capable of adjusting a recline angle of a backrest with multiple stages.

2. Description of the Prior Art

In general, a baby carriage comprises a frame and a backrest. To comfort a baby seated in the baby carriage, the backrest of most baby carriages is capable of rotating with respect to the frame to adjust a recline angle. Accordingly, the baby carriage is usually equipped with a backrest angle adjusting device for adjusting the recline angle of the backrest. The prior arts may be referred to US patent No. 6,830,254, China patent application No. ZL200720171699.3, China patent application No. ZL200820147287.0, and so on.

In US patent No. 6,830,254, a seat frame of a baby carriage is disposed on a leg unit, a backrest is pivotally connected to the seat frame such that the backrest is capable of rotating with respect to the seat frame, and a positioning seat is disposed between the leg unit and the backrest. A groove-type first engaging member and a pin-type second engaging member are disposed on the positioning seat, such that the backrest can be positioned at a predetermined angle with respect to the seat frame. To adjust the recline angle of the backrest, a user operates an unlock member to drive a string to pull the second engaging member tc disengage from the first engaging member. Accordingly, the user can adjust the recline angle of the backrest.

In China patent application No. ZL200720171699.3, a backrest of a baby carriage is supported by a pulling strip and kept at a recline angle. The recline angle of the backrest is adjusted by adjusting a length of the pulling strip and a buckle device is used to fix the length of the pulling strip.

Furthermore, in China patent application No. ZL200820147287.0, a backrest support of a baby carriage is connected to a transverse support. To adjust a recline angle of the backrest support, a user operates a handle to control a positioning stopper to disengage from a positioning base through a connecting mechanism (e.g. rope) . Accordingly, the user can adjust the recline angle of the backrest support. After the backrest support is adjusted to a desired angle, the user operates the handle to control the positioning stopper to engage with the positioning base, so as to keep the backrest support at the desired angle.

In the aforesaid prior arts, the conventional baby carriage capable of adjusting recline angle of the backrest is inconvenient and still has some drawbacks for further improvement. To solve the aforesaid problems, the manufacturers have made much effort but they do not develop any suitable solutions. Moreover, the present products do not provide suitable structure for solving the aforesaid problems. Therefore, how to develop an improved backrest angle adjusting device adapted to a baby carriage is a significant issue so far.

Summary of the Invention

An objective of the invention is to provide a backrest angle adjusting device having simple structure, reasonable design and multi-stage adjustment.

Another objective of the invention is to provide a baby carriage equipped with a backrest angle adjusting device having simple structure, reasonable design and multi-stage adjustment.

To achieve the aforesaid objective, the invention provides a backrest angle adjusting device adapted to a baby carriage. The baby carriage comprises a frame and a backrest, wherein a recline angle of the backrest is adjustable with respect to the frame. The backrest angle adjusting device comprises a fixing base and a driving base, wherein the fixing base is fixed on the frame, and the driving base is connected to the backrest and capable of rotating with respect to the fixing base. The fixing base has at least two engaging grooves, wherein the engaging grooves are arranged in an arc shape to form a multi-stage structure. The driving base has a lock member engaged with one of the engaging grooves. The engaging groove and the lock member are capable of engaging with each other at a predetermined angle, so as to lock the driving base with respect to the fixing base.

Compared to the prior art, the backrest angle adjusting device of the invention comprises the fixing base, which is fixed on the frame, and the driving base, which is connected to the backrest and capable of rotating with respect to the fixing base, and the engaging grooves disposed on the fixing base are arranged in the arc shape to form the multi-stage structure. Accordingly, when the lock member disposed on the driving base is engaged with different engaging grooves of different stages, the recline angle of the backrest with respect to the frame is different, so as to achieve the objectives of multi-stage adjustment, simple structure and reasonable design.

Preferably, the backrest angle adjusting device further comprises a connecting member, an end of the connecting member is connected to the driving base, and another end of the connecting member is connected to an operating member.

Preferably, the backrest angle adjusting device further comprises an adjusting mechanism, the adjusting mechanism comprises a support member and a handle, an end of the support member is pivotally connected to a tube of the backrest, another end of the support member is pivotally connected to the handle, and the handle is supported by the support member.

Preferably, each of the operating member and the handle has a grabbing portion protruded outwardly for a finger to pull.

Preferably, the connecting member is a rigid structure and supports the operating member.

Preferably, the connecting member and the operating member are arranged independently.

Preferably, the driving base further comprises a driving member, the driving member is slidably disposed on a tube of the backrest, and the driving member is slid to drive the lock member to be engaged with or disengaged from the engaging groove.

Preferably, the tube has a first restraining hole formed thereon, the first restraining hole is elongated, and the first restraining hole restrains a sliding distance of the driving member with respect to the tube.

Preferably, the lock member is elongated, the lock member is slidably disposed in the tube, a lower end of the lock member is protruded out of a free end of the tube to forma lock portion engaged with the engaging groove, an upper end of the lock member is connected to the driving member, and the lock member and the driving member slide with respect to the tube synchronously.

Preferably, a free end of the lock portion is inclined.

Preferably, the engaging grooves are tooth-shaped.

Preferably, the backrest angle adjusting device further comprises a first pin, the first pin passes through the first restraining hole of the tube, the driving member and the lock member, the first pin restrains the driving member to slide within the first restraining hole, and the lock member and the driving member slide with respect to the tube synchronously through the first pin.

Preferably, the backrest angle adjusting device further comprises a first resilient member, and the first resilient member biases the lock member toward the engaging groove.

Preferably, the lock member has a second restraining hole formed thereon, the second restraining hole is elongated, a second pin passes through the tube and the second restraining hole, and the second restraining hole further restrains the sliding distance of the driving member with respect to the tube.

Preferably, a length of the first restraining hole is identical to a length of the second restraining hole.

Preferably, the fixing base is pivotally connected to the tube.

Preferably, the second pin is disposed on the fixing base and the fixing base is pivotally connected to the tube through the second pin.

Preferably, the fixing base has an engaging portion protruded toward the driving base and the engaging grooves are disposed on the engaging portion.

Preferably, the engaging grooves are disposed on the engaging portion with identical distances with respect to the second pin.

Preferably, the engaging portion is located below the lock member.

Preferably, an outline of the engaging portion is arc-shaped.

Preferably, the connecting member is flexible and the operating member is slidably disposed on the handle.

Preferably, the connecting member is a webbing.

Preferably, the handle has a sliding pillar protruded toward the operating member, the operating member has a sliding groove formed thereon, and the sliding pillar is slidably disposed in the sliding groove.

Preferably, the driving member has a trigger portion protruded toward the fixing base, the trigger portion and the fixing base slidably and complementarily contact each other with inclined surfaces, and the lock member is disengaged from the engaging groove when the trigger portion of the driving member slides with respect tc the fixing base.

Preferably, the lock member is disposed on a free end of the tube horizontally and protruded toward the engaging groove.

Preferably, the lock member is pillar-shaped.

Preferably, the engaging grooves are recess structures sunk inwardly and horizontally.

Preferably, side walls of the recess structures are inclined.

Preferably, an arc-shaped groove is formed on a surface of the fixing base and faces the driving base, a first inclined surface is formed on a side wall of the arc-shaped groove, and the trigger portion has a second inclined surface slidably and complementarily contacting the first inclined surface.

Preferably, the backrest angle adjusting device further comprises a second resilient member, and the second resilient member biases the trigger portion of the driving member toward the arc-shaped groove of the fixing base.

Preferably, the backrest angle adjusting device further comprises an engaging member, the engaging member is fan-shaped and disposed in the fixing base, and the arc-shaped groove and the engaging grooves are disposed on the engaging member.

Preferably, the engaging member is horizontally and slidably disposed in the fixing base.

Preferably, the backrest angle adjusting device further comprises a third resilient member, and the third resilient member biases the engaging member toward the driving base.

A baby carriage of the invention comprises a frame, a backrest and the aforesaid backrest angle adjusting device. The recline angle of the backrest is adjustable with respect to the frame through the backrest angle adjusting device.

Compared to the prior art, the baby carriage of the invention has the backrest angle adjusting device, the backrest angle adjusting device comprises the fixing base, which is fixed on the frame, and the driving base, which is connected to the backrest and capable of rotating with respect to the fixing base, and the engaging grooves disposed on the fixing base are arranged in the arc shape to form the multi-stage structure. Accordingly, when the lock member disposed on the driving base is engaged with different engaging grooves of different stages, the recline angle of the backrest with respect to the frame is different, so as to achieve the objectives of multi-stage adjustment, simple structure and reasonable design.

These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.

Brief Description of the Drawings

FIG. 1 is a schematic view illustrating a baby carriage equipped with a backrest angle adjusting device according to a first embodiment of the invention.

FIG. 2 is an enlarged view illustrating the part A shown in FIG. 1.

FIG. 3 is a schematic view illustrating the driving base and the tube shown in FIG. 2.

FIG. 4 is a partial perspective view illustrating the driving base and the tube shcwn in FIG. 3.

FIG. 5 is an exploded view illustrating the driving base and the tube shown in FIG. 4.

FIG. 6 is a schematic view illustrating a baby carriage equipped with a backrest angle adjusting device according to a second embodiment of the invention.

FIG. 7 is a schematic view illustrating the backrest angle adjusting device without the connecting member shown in FIG. 6.

FIG. 8 is a schematic view illustrating the driving base and the tube shown in FIG. 7.

FIG. 9 is a schematic view illustrating the adjusting mechanism and the connecting member shown in FIG. 8.

FIG. 10 is an enlarged view illustrating the part B shown in FIG. 7.

FIG. 11 is a schematic view illustrating the fixing base of the backrest angle adjusting device shown in FIG. 7.

Detailed Description

There are several embodiments of the invention described in the following with the appended drawings, wherein the same numerals in the drawings represent the same elements.

As shown in FIGs. 1 and 6, a baby carriage 100 of the invention comprises a frame 10, a backrest 20 and a backrest angle adjusting device 30, wherein a recline angle of the backrest 20 is adjustable with respect to the frame 10. The recline angle of the backrest 20 is adjustable with respect to the frame 10 through the backrest angle adjusting device 30, so as to achieve angle adjustment for the backrest 20. To achieve angle adjustment for the backrest 20 and maintain stability for the baby carriage 100, the backrest angle adjusting devices 30 are disposed on opposite sides of the frame 10 symmetrically. In the following, FIGs. 2-5 and 7-11 are used further for describing the backrest angle adjusting devices 30 of the invention in detail.

Specifically, FIGs. 1-5 illustrate the backrest angle adjusting devices 30 according to a first embodiment of the invention, and FIGs. 6-10 illustrate the backrest angle adjusting devices 30 according to a second embodiment of the invention.

First embodiment: As shown in FIGs. 1 and 2, the backrest angle adjusting device 30 of the invention comprises a fixing base 31 and a driving base 32, wherein the fixing base 31 is fixed on the frame 10, and the driving base 32 is connected to the backrest 20 and capable of rotating with respect to the fixing base 31. The fixing base 31 has at least two engaging grooves 310, wherein the engaging grooves 310 are arranged in an arc shape to form a multi-stage structure. The driving base 32 has a lock member 320 engaged with one of the engaging grooves 310.

The engaging groove 310 and the lock member 320 are capable of engaging with each other at a predetermined angle, so as to lock the driving base 32 with respect to the fixing base 31. Specifically, in this embodiment, five engaging grooves 310 are disposed on the fixing base 31, wherein the five engaging grooves 310 are arranged in an arc shape to form a five-stage structure. When the lock member 320 is engaged with different engaging grooves 310, the driving base 32 is fixed at different angles with respect to the fixing base 31, such that the backrest 20 is positioned at different recline angles with respect to the frame 10, so as to achieve angle adjustment for the backrest 20. The number of the engaging grooves 310 can be determined by one skilled in the art according to the embodiments of the invention under practical requirements, so they will not be depicted herein in detail. As mentioned in the above, the backrest angle adjusting device 30 of the invention comprises the fixing base 31, which is fixed on the frame 10, and the driving base 32, which is connected to the backrest 20 and capable of rotating with respect to the fixing base 31, and the engaging grooves 310 disposed on the fixing base 31 are arranged in the arc shape to form the multi-stage structure. Accordingly, when the lock member 320 disposed on the driving base 32 is engaged with different engaging grooves 310 of different stages, the recline angle of the backrest 20 with respect to the frame 10 is different, so as to achieve the objectives of multi-stage adjustment, simple structure and reasonable design.

As shown in FIGs. 2 and 3, to perform engagement between the lock member 320 and the engaging groove 310, the backrest angle adjusting device 30 further comprises a connecting member 33, wherein an end of the connecting member 33 is connected to the driving base 32 and another end of the connecting member 33 is connected to an operating member 330.

The connecting member 33 is a rigid structure, such that the connecting member 33 can support the operating member 330 directly. A user can pull the operating member 330 in a direction indicated by an arrow F1 shown in FIG. 3. When the operating member 330 is pulled, the operating member 330 drives the connecting member 33 to move. When the connecting member 33 is moving, the connecting member 33 drives the lock member 320 of the driving base 32 to disengage from the engaging groove 310, so as to unlock the driving base 32 and the fixing base 31. After unlocking the driving base 32 and the fixing base 31, the user can adjust the recline angle of the backrest 20 according to his/her need. After finishing adjusting the recline angle of the backrest 20, the user releases the force in the direction F1, such that the lock member 320 is engaged with the engaging groove 310 again. Consequently, the adjustment of the recline angle of the backrest 20 is finished. Since the lock member 320 is engaged with or disengaged from the engaging groove 310 (i.e. both locked together or unlocked from each other) through the cooperation between the operating member 330 and the connecting member 33, the design is reasonable, the structure is simple and the operation is convenient.

As shown in FIGs. 3 and 4, the backrest angle adjusting device 30 further comprises an adjusting mechanism, wherein the adjusting mechanism comprises a support member 38 and a handle 39. An end of the support member 38 is pivotally connected to a tube 21 of the backrest 20 and another end of the support member 38 is pivotally connected to the handle 39. The handle 39 is supported by the support member 38. When the handle 39 is pulled, the tubes 21 are folded due to the action of the support member 38.

As shown in FIGs. 3 and 4, to operate the operating member 330 and the handle 39 much well, the operating member 330 has a grabbing portion 331 protruded outwardly for a finger to pull and the handle 39 also has a grabbing portion 391 protruded outwardly for a finger to pull.

Preferably, the connecting member 33 may be a rigid structure (e.g. metal structure, rigid plastic structure, etc.), such that the connecting member 33 can support the operating member 330.

Preferably, since the connecting member 33 can support the operating member 330 independently, the connecting member 33 and the operating member 330 are arranged independently.

As shown in FIGs. 2-4, to perform the engagement between the lock member 320 and the engaging groove 310, the driving base 32 further comprises a driving member 34, wherein the driving member 34 is slidably disposed on the tube 21 of the backrest 20. The driving member 34 is connected to an end of the aforesaid connecting member 33 and another end of the connecting member 33 is connected to the aforesaid operating member 330. When the operating member 330 is operated, the operating member 330 will operate the driving member 34 directly through the connection of the connecting member 33, such that the driving member 34 and the operating member 330 will move together. When the driving member 34 is sliding, the driving member 34 will drive the lock member 320 to engage with or disengage from the engaging groove 310. Specifically, when the operating member 330 is operated in the direction indicated by the arrow Fl shown in FIG. 3, the lock member 320 is disengaged from the engaging groove 310. The arrangement of the driving member 34 can further ensure stability and convenience when operating the operating member 330 to control the engagement between the lock member 320 and the engaging groove 310.

As shown in FIGs. 2-5, the invention provides two manners for restraining the moving distance of the driving base 32. The first restraining manner is described in the following. The tube 21 has a first restraining hole 341 formed thereon and corresponding to the driving member 34, wherein the first restraining hole 341 is elongated. The driving member 34 has an installation hole 342 formed thereon and corresponding to the first restraining hole 341. The lock member 320 has a fixing hole 343 formed thereon and corresponding to the installation hole 342. The first pin 344 passes through the installation hole 342 of the driving member 34, the first restraining hole 341 of the tube 21 and the fixing hole 343 of the lock member 320. The first pin 344 restrains the driving member 34 to slide within the first restraining hole 341. The lock member 320 and the driving member 34 slide with respect to the tube 21 synchronously through the first pin 344. Accordingly, when the operating member 330 is pulled, the driving member 34 will drive the lock member 320 to slide synchronously within the first restraining hole 341 of the tube 21.

As shown in FIGs. 2-5, the lock member 320 is elongated, the lock member 320 is slidably disposed in the tube 21, and a lower end of the lock member 320 is protruded out of a free end of the tube 21 to form a lock portion 321 engaged with the engaging groove 310. An upper end of the lock member 320 is connected to the driving member 34 through the first pin 344, such that the lock member 320 and the driving member 34 can slide with respect to the tube 21 synchronously. Since the lock member 320 is elongated, the lock member 320 can be installed and hid in the tube 21 easily, such that the structure may be more compact and reasonable. Furthermore, the inner wall of the tube 21 maybe used to guide the slide of the lock member 320.

As shown in FIGs. 2-5, to ensure that the lock member 320 is always engaged with the engaging groove 310 under a natural state (i.e. a state needs not to change the recline angle of the backrest) and ensure stability and security of the baby carriage, the backrest angle adjusting device 30 further comprises a first resilient member 35, wherein the first resilient member 35 is compressed and abuts against the upper end of the lock member 320 and the tube 21, i.e. the first resilient member 35 always biases the lock member 320 toward the engaging groove 310. Accordingly, the invention can ensure that the lock member 320 is always engaged with the engaging groove 310 under the natural state. Furthermore, after operating the operating member 30 to disengage the lock member 320 from the engaging groove 310, the lock member 320 can be engaged with the engaging groove 310 automatically due to the elastic force generated by the first resilient member 35, so as to achieve automatic recovery function for the lock member 320.

The second restraining manner of the moving distance of the driving base 32 is described in the following. As shown in FIGs. 2-5, the lock member 320 has a second restraining hole 322 formed thereon, wherein the second restraining hole 322 is elongated. The tube 21 has a connecting hole 323 formed thereon and corresponding to the second restraining hole 322. The second pin 324 passes through the connecting hole 323 of the tube 21 and the second restraining hole 322 of the lock member 320. The invention may restrain the sliding distance of the driving member 34 with respect to the tube 21 by the cooperation between the second pin 324 and the second restraining hole 322.

The aforesaid two restraining manners of the moving distance of the driving base 32 may be implemented Independently or simultaneously. Needless to say, the stability of the lock member 320 and the durability of the driving base 32 maybe further ensured when the aforesaid two restraining manners are implemented simultaneously.

Specifically, if the aforesaid two restraining manners are Implemented simultaneously, the length of the first restraining hole 341 may be identical to or different from the length of the second restraining hole 322. On the other hand, if the aforesaid two restraining manners are not implemented simultaneously, the moving distance of the driving base 32 is determined by the shorter restraining hole. When the operating member 330 is pulled upwardly (i.e. the direction indicated by the arrow F1 shown in FIG. 3) , the lock member 320 will move upwardly and then the lock portion 321 of the lock member 320 will be disengaged from the engaging groove 310. To prevent the lock member 320 from moving upwardly and endlessly, when the lock member 320 moves over a predetermined distance, the second pin 324 will abur against a lower edge of the second restraining hole 322 or the first pin 344 will abut against an upper edge of the first restraining hole 341, such that the lock member 320 cannot move on. At this time, one or both of the first restraining hole 341 and the second restraining hole 322 restrain(s) the lock member 320 from moving upwardly. As mentioned in the above, the first restraining hole 341 and the second restraining hole 322 can restrain the lock member 320 from moving independently and effectively. One skilled in the art may use one or both of the first restraining hole 341 and the second restraining hole 322 to restrain the lock member 320 from moving according to practical applications.

As shown in FIGs. 2 and 5, the second pin 324 is disposed on the fixing base 31. The tube 21 is pivotally connected to the fixing base 31 through the second pin 324, such that the tube 21 can rotate with respect to the fixing base 31 on the second pin 324. Accordingly, the recline angle of the backrest can be adjusted by the rotation of the tube 21.

As shown in FIGs. 2 and 5, to dispose the engaging grooves 310 on the fixing base 31 much well, the fixing base 31 has an engaging portion 31a protruded toward the driving base 32 and the engaging grooves 310 are disposed on the engaging portion 31a. Specifically, the engaging grooves 310 are disposed on the engaging portion 31a with identical distances with respect to the second pin 324.

Preferably, the engaging portion 31a is located below the lock member 320.

Preferably, an outline of the engaging portion 31a is arc-shaped.

Preferably, the connecting member 33 is pivotally connected to the operating member 330 and the driving base 32.

Preferably, a free end of the lock portion 321 is inclined.

Preferably, the engaging grooves 310 are tooth-shaped.

Preferably, the free end of the lock portion 321 and the engaging grooves 310 may be inclined and tooth-shaped independently or simultaneously and the objective is to allow the user to adjust the recline angle of the backrest 20 toward upright direction without exerting force upon the operating member 330. If the free end of the lock portion 321 and the engaging grooves 310 are inclined and tooth-shaped simultaneously, the free end of the lock member 321 and the engaging groove 310 cooperate with each other by inclined surfaces, such that the user may save more effort in operation.

Second embodiment: Referring to FIGs. 6-8, a backrest angle adjusting device 30' of the invention comprises a fixing base 31' and a driving base 32', wherein the fixing base 31' is fixed on the frame 10, and the driving base 32' is connected to the backrest 20 and capable of sliding with respect to the backrest 20. The fixing base 31' has at least two engaging grooves 310', wherein the engaging grooves 310' are arranged in an arc shape to form a multi-stage structure. The driving base 32' has a lock member 320' engaged with one of the engaging grooves 310'. The engaging groove 310' and the lock member 320' are capable of engaging with each other at a predetermined angle, so as to lock the driving base 32' with respect to the fixing base 31'. Specifically, in this embodiment, five engaging grooves 310' are disposed on the fixing base 31', wherein the five engaging grooves 310' are arranged in an arc shape to form a five-stage structure. The lock member 320' is a protruding pillar fixed on the backrest 20. When the lock member 320' is engaged with different engaging grooves 310', the driving base 32' is fixed at different angles with respect to the fixing base 31', such that the backrest 20 is positioned at cifferent recline angles with respect to the frame 10, so as to achieve angle adjustment for the backrest 20. The number of the engaging grooves 310' can be determined by one skilled in the art according to the embodiments of the invention under practical requirements, so they will not be depicted herein in detail. As mentioned in the above, the backrest angle adjusting device 30' of the invention comprises the fixing base 31', which is fixed on the frame 10, and the driving base 32', which is connected to the backrest 20 and capable of sliding with respect to the backrest 20, and the engaging grooves 310' disposed on the fixing base 31' are arranged in the arc shape to form the multi-stage structure. Accordingly, when the lock member 320' disposed on the driving base 32' is engaged with different engaging grooves 310' of different stages, the recline angle of the backrest 20 with respect to the frame 10 is different, so as to achieve the objectives of multi-stage adjustment, simple structure and reasonable design.

As shown in FIGs. 6-8, to perform engagement between the lock member 320' and the engaging groove 310', the backrest angle adjusting device 30' further comprises a connecting member 33', wherein an end of the connecting member 33' is connected to the driving base 32' and another end of the connecting member 33' is connected to an operating member 330'. In this embodiment, the connecting member 33' is a flexible webbing and the operating member 330' is slidably disposed on the backrest 20. In another embodiment, the connecting member 33' may be a rigid structure, such that the operating member 330' may not be connected to the backrest 20. A user can pull the operating member 330' in a direction indicated by an arrow D1 shown in FIG. 8. When the operating member 330' is pulled, the operating member 330' drives the connecting member 33' to move. When the connecting member 33' is moving, the connecting member 33' drives the lock member 320' of the driving base 32' to disengage from the engaging groove 310', so as to unlock the driving base 32' and the fixing base 31'. After unlocking the driving base 32' and the fixing base 31', the user can adjust the recline angle of the backrest 20 according to his/her need. After finishing adjusting the recline angle of the backrest 20, the user releases the force in the direction Dl, such that the lock member 320' is engaged with the engaging groove 310' again. Consequently, the adjustment of the recline angle of the backrest 20 is finished. Since the lock member 320' is engaged with or disengaged from the engaging groove 310' (i.e. both locked together or unlocked from each other) through the cooperation between the operating member 330' and the connecting member 33', the design is reasonable, the structure is simple and the operation is convenient.

As shown in FIGs. 8 and 9, the backrest angle adjusting device 30' further comprises an adjusting mechanism, wherein the adjusting mechanism comprises a support member 38' and a handle 39'. An end of the support member 38' is pivotally connected to a tube 21 of the backrest 20 and another end of the support member 38' is pivotally connected to the handle 39'. The handle 39' is supported by the support member 38'. When the handle 39' is pulled, the tubes 21 are folded due to the action of the support member 38'.

As shown in FIGs. 8 and 9, to operate the operating member 330' and the handle 39' much well, the operating member 330' has a grabbing portion 331' protruded outwardly for a finger to pull and the handle 39' also has a grabbing portion 391' protruded outwardly for a finger to pull.

Preferably, when the connecting member 33' is a webbing, the operating member 330' is slidably disposed on the handle 39', so as to support the operating member 330'.

As shown in FIGs. 8 and 9, to make the operating member 330' slide on the handle 39' smooth, the handle 39' has a slidingpillar392'protrudedtowardtheoperating=ber330', the operating member 330' has a sliding groove 332' formed thereon, and the sliding pillar 392' is slidably disposed in the sliding groove 332'.

As shown in FIGs. 6-8, to perform the engagement between the lock member 320' and the engaging groove 310', the driving base 32' further comprises a driving member 34', wherein the driving member 34' is slidably disposed on the tube 21 of the backrest 20. The driving member 34' is connected to an end of the aforesaid connecting member 33' and another end of the connecting member 33' is connected to the aforesaid operating member 330'. When the operating member 330' is operated, the operating member 330' will operate the driving member 34' directly through the connection of the connecting member 33', such that the driving member 34' and the operating member 330' will move together. When the driving member 34' is sliding, the driving member 34' will drive the lock member 320' to engage with or disengage from the engaging groove 310'. The arrangement of the driving member 34' can further ensure stability and convenience when operating the operating member 330' to control the engagement between the lock member 320' and the engaging groove 310'. Specifically, the tube 21 of this embodiment also has the first restraining hole (not shown in the figures) formed thereon, like the aforesaid first embodiment. The driving member 34'has an installation hole 34a' formed thereon and corresponding to the first restraining hole. The first pin 344 passes through the installation hole 34a' of the driving member 34' and the first restraining hole of the tube 21. The first pin 344 restrains the driving member 34' to slide within the first restraining hole and restrains the driving member 34' to slide within a specific range on the tube 21.

As shown in FIGs. 8 and 10, to slide the driving member 34' much well to drive the lock member to engage with or disengage from the engaging groove 310', the driving member 34' has a trigger portion 341' protruded toward the fixing base 31'. Specifically, the trigger portion 341' has an inclined surface toward a sliding direction of the trigger portion 341' along the backrest 20. Preferably, the trigger portion 341' and the fixing base 32' slidably and complementarily contact each other with inclined surfaces. The lock member 320' is disengaged from the engaging groove 310' when the trigger portion 341' of the driving member 34' slides with respect to the fixing base 31'. Accordingly, when operating the operating member 330', the operating member 330' can drive the driving member 34' to move together through the connecting member 33'. When the driving member 34'is moving, the trigger portion 341' protruded from the driving member 34' will move synchronously. When the trigger portion 341' is moving, the trigger portion 341' will push the fixing base 31', which slidably and complementarily contacts the trigger portion 341', to move away from the trigger portion 341', so as to disengage the lock member 320' from the engaging groove 310'. The arrangement of the trigger portion 341' can further ensure stability and reliability when the lock member 320' is engaged with or disengaged from the engaging groove 310'.

As shown in FIGs. Band 10, the lock member 320' is disposed on a free end of the tube 21 horizontally and protruded toward the engaging groove 310'. Corresponding to the lock member 320', the engaging grooves 310' are recess structures sunk inwardly and horizontally. The lock member 320' is pillar-shaped, such that the lock member 320' can be engaged with or disengaged from the engaging groove 310' more easily and smoothly.

As shown in FIGs. 10 and 11, to improve the manufacture and assembly, the backrest angle adjusting device 30 further comprises an engaging member 36', the engaging member 36' is fan-shaped and disposed in the fixing base 31', and the arc-shaped groove 311' and the engaging grooves 310' are disposed on the engaging member 36'.

Preferably, the engaging member 36' is horizontally and slidably disposed in the fixing base 31'. Specifically, two positioning pillars 313' are protruded from the fixing base 31' horizontally and the engaging member 36' has two sliding holes 361' formed thereon and corresponding to the positioning pillars 313'. Through the cooperation between the positioning pillars 313' and the sliding holes 361', the engaging member 36' can be horizontally and slidably disposed in the fixing base 31'. That is to say, the engaging member 36' can slide in a direction parallel to the positioning pillars 313'.

As shown in FIGs. 10 and 11, to guide the lock member 320' to be engaged with or disengaged from the engaging groove 310' smoothly, the side walls of the recess structures are inclined, i.e. the side walls of the engaging grooves 310' are inclined. When the pillar-shaped lock member 320' is inserted into the engaging groove 310', the side walls of the engaging groove 310' will guide the lock member 320' into the engaging groove 310' smoothly. On the other hand, when the lock member 320' is disengaged from the engaging groove 310', the side walls of the engaging groove 310' will also guide the lock member 320' out from the engaging groove 310' gradually and smoothly. Accordingly, more effort will be saved in operation.

As shown in FIGs. 10 and 11, to push the fixing base 31', which slidably and complementarily contacts the trigger portion 341', away from or close to the trigger portion 341' much well, an arc-shaped groove 311' is formed on a surface of the fixing base 31' and faces the driving base 32', a first inclined surface 312' is formed on a side wall of the arc-shaped groove 311', and the trigger portion 341' has a second inclined surface 342' slidably and complementarily contacting the first inclined surface 312'. When operating the operating member 330', the operating member 330' drives the driving member 34' to move together through the connecting member 33'. When the driving member 34' is moving, the trigger portion 341' protruded from the driving member 34' will move synchronously. Since the second inclined surface 342' of the trigger portion 341' slidably and complementarily contacts the first inclined surface 312' of the fixing base 31', the trigger portion 341' will push the fixing base 31' to move away from the trigger portion 341', such that the engaging groove 310' arranged horizontally will move away from the lock member 320' arranged horizontally till the lock member 320' is disengaged from the engaging groove 310'. Furthermore, when the driving member 34' moves in a direction opposite to the aforesaid direction, the lock member 320' will be inserted into the engaging groove 310' gradually, so as to engage the lock member 320' with the engaging groove 310'. The arrangement of the first inclined surface 312' and the second inclined surface 342' can further ensure stability and reliability when the lock member 320' is engaged with or disengaged from the engaging groove 310'.

As shown in FIG. 10, to ensure that the lock member 320' is always engaged with the engaging groove 310' under a natural state (i.e. a state needs not to change the recline angle of the backrest) , the backrest angle adjusting device 30' further comprises a second resilient member 35', wherein the second resilient member 35' is compressed and disposed between an upper end of the driving member 34' and the tube 21. The second resilient member 35' always provides a downward pressure to the driving member 34'. Since the trigger portion 341' is protruded into the arc-shaped groove 311' of the fixing base 31' to form a complementary contact with inclined surfaces, the second resilient member 35' always biases the trigger portion 341' toward the arc-shaped groove 311' of the fixing base 31' under the natural state, so as to ensure that the lock member 320' is always engaged with the engaging groove 310' under the natural state. Furthermore, after operating the operating member 330' to disengage the lock member 320' from the engaging groove 310', the trigger portion 341' will abut against the arc-shaped groove 311' of the fixing base 31' again to provide an elastic force. Accordingly, the lock member 320' can be engaged with the engaging groove 310' automatically due to the elastic force generated by the second resilient member 35', so as to achieve automatic recovery function for the lock member 320'.

As shown in FIGs. 10 and 11, to further ensure that the lock member 320' is always engaged with the engaging groove 310' under the natural state, the backrest angle adjusting device 30' further comprises a third resilient member 37', wherein the third resilient member 37' is compressed and disposed between the fixing base 31' and the engaging member 36'. The third resilient member 37' always biases the engaging member 36' toward the driving base 32'. Since the engaging member 36' is always biased toward the driving base 32' by the elastic force generated by the third resilient member 37' and the arc-shaped groove 311' and the engaging grooves 310' are disposed on the engaging member 36' , the first inclined surface 312' of the arc-shaped groove 311' always contacts the second inclined surface 342' of the trigger portion 341' under pressure. Accordingly, the second resilient member 35' and the third resilient member 37' always biases the trigger portion 341' toward the arc-shaped groove 311' of the fixing base 31' under the natural state, so as to ensure that the lock member 320' is always engaged with the engaging groove 310' under the natural state. Furthermore, when the lock member 320' is disengaged from the engaging groove 310', the second resilient member 35' and the third resilient member 37' always provide a force to restrain the trigger portion 341' from moving. Accordingly, when a user is operating the operating member 330', the invention can provide better hand feeling, avoid mis-operation, and provide stable and reliable operation.

Preferably, the second resilient member 35' and the third resilient member 37' may be helical springs.

Moreover, the structure and principle of the frame 10 and the backrest 20 of the baby carriage 100 of the invention are well known by one skilled in the art, so they will not be depicted herein in detail.

Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.

Claims

CLAIMSWhat is claimed is: 1. A backrest angle adjusting device adapted to a baby carriage, the baby carriage comprising a frame and a backrest, a recline angle of the backrest being adjustable with respect to the frame, the backrest angle adjusting device comprising: a fixing base fixed on the frame, the fixing base having at least two engaging grooves, the engaging grooves being arranged in an arc shape to form a multi-stage structure; and a driving base connected to the backrest and capable of rotating with respect to the fixing base, the driving base having a lock member engaged with one of the engaging grooves, the engaging groove and the lock member being capable of engaging with each other at a predetermined angle, so as to lock the driving base with respect to the fixing base.
2. The backrest angle adjusting device of claim 1, further comprising a connecting member, an end of the connecting member being connected to the driving base, another end of the connecting member being connected to an operating member.
3. The backrest angle adjusting device of claim 2, further comprising an adjusting mechanism, the adjusting mechanism comprising a support member and a handle, an end of the support member being pivotally connected to a tube of the backrest, another end of the support member being pivotally connected to the handle, the handle being supported by the support member.
4. The backrest angle adjusting device of claim 3, wherein each of the operating member and the handle has a grabbing portion protruded outwardly for a finger to pull.
5. The backrest angle adjusting device of claim 3, wherein the connecting member is a rigid structure and supports the operating member.
6. The backrest angle adjusting device of claim 5, wherein the connecting member and the operating member are arranged independently.
7. The backrest angle adjusting device of claim 2, wherein the driving base further comprises a driving member, the driving member is slidably disposed on a tube of the backrest, and the driving member is slid to drive the lock member to be engaged with or disengaged from the engaging groove.
8. The backrest angle adjusting device of claim 7, wherein the tube has a first restraining hole formed thereon, the first restraining hole is elongated, and the first restraining hole restrains a sliding distance of the driving member with respect to the tube.
9. The backrest angle adjusting device of claim 8, wherein the lock member is elongated, the lock member is slidably disposed in the tube, a lower end of the lock member is protruded out of a free end of the tube to form a lock portion engaged with the engaging groove, an upper end of the lock member is connected to the driving member, and the lock member and the driving member slide with respect to the tube synchronously.
10. The backrest angle adjusting device of claim 9, wherein a free end of the lock portion is inclined.
11. The backrest angle adjusting device of claim 10, wherein the engaging grooves are tooth-shaped.
12. The backrest angle adjusting device of claim 9, further comprising a first pin, the first pin passing through the first restraining hole of the tube, the driving member and the lock member, the first pin restraining the driving member to slide within the first restraining hole, the lock member and the driving member sliding with respect to the tube synchronously through the first pin.
13. The backrest angle adjusting device of claim 9, further comprising a first resilient member, the first resilient member biasing the lock member toward the engaging groove.
14. The backrest angle adjusting device of claim 9, wherein the lock member has a second restraining hole formed thereon, the second restraining hole is elongated, a second pin passes through the tube and the second restraining hole, and the second restraining hole further restrains the sliding distance of the driving member with respect to the tube.
15. The backrest angle adjusting device of claim 14, wherein a length of the first restraining hole is identical to a length of the second restraining hole.
16. The backrest angle adjusting device of claim 14, wherein the fixing base is pivotally connected to the tube.
17. The backrest angle adjusting device of claim 16, wherein the second pin is disposed on the fixing base and the fixing base is pivotally connected to the tube through the second pin.
18. The backrest angle adjusting device of claim 17, wherein the fixing base has an engaging portion protruded toward the driving base and the engaging grooves are disposed on the engaging portion.
19. The backrest angle adjusting device of claim 18, wherein the engaging grooves are disposed on the engaging portion with identical distances with respect to the second pin.
20. The backrest angle adjusting device of claim 19, wherein the engaging portion is located below the lock member.
21. The backrest angle adjusting device of claim 20, wherein an outline of the engaging portion is arc-shaped.
22. The backrest angle adjusting device of claim 3, wherein the connecting member is flexible and the operating member is slidably disposed on the handle.
23. The backrest angle adjusting device of claim 22, wherein the connecting member is a webbing.
24. The backrest angle adjusting device of claim 22, wherein the handle has a sliding pillar protruded toward the operating member, the operating member has a sliding groove formed thereon, and the sliding pillar is slidably disposed in the sliding groove.
25. The backrest angle adjusting device of claim 7, wherein the driving member has a trigger portion protruded toward the fixing base, the trigger portion and the fixing base slidably and complementarily contact each other with inclined surfaces, and the lock member is disengaged from the engaging groove when the trigger portion of the driving member slides with respect to the fixing base.
26. The backrest angle adjusting device of claim 25, wherein the lock member is disposed on a free end of the tube horizontally and protruded toward the engaging groove.
27. The backrest angle adjusting device of claim 26, wherein the lock member is pillar-shaped.
28. The backrest angle adjusting device of claim 27, wherein the engaging grooves are recess structures sunk inwardly and horizontally.
29. The backrest angle adjusting device of claim 28, wherein side walls of the recess structures are inclined.
30. The backrest angle adjusting device of claim 25, wherein an arc-shaped groove is formed on a surface of the fixing base and faces the driving base, a first inclined surface is formed on a side wall of the arc-shaped groove, the trigger portion has a second inclined surface slidably and complementarily contacting the first inclined surface.
31. The backrest angle adjusting device of claim 30, further comprising a second resilient member, the second resilient member biasing the trigger portion of the driving member toward the arc-shaped groove of the fixing base.
32. The backrest angle adjusting device of claim 31, further comprising an engaging member, the engaging member being fan-shaped and disposed in the fixing base, the arc-shaped groove and the engaging grooves being disposed on the engaging member.
33. The backrest angle adjusting device of claim 32, wherein the engaging member is horizontally and slidably disposed in the fixing base.
34. The backrest angle adjusting device of claim 33, further comprising a third resilient member, the third resilient member biasing the engaging member toward the driving base.
35. A baby carriage comprising the frame, the backrest and the backrest angle adjusting device of any one of claims 1-34, the recline angle of the backrest being adjustable with respect to the frame through the backrest angle adjusting device.