Baby carriage

Claim 2

A baby carriage comprising a pair of front legs having front wheels on the lower portions thereof, a pair of rear legs having rear wheels on the lower portions thereof and turnably connected to said front legs by first pins at the intersections therebetween, a pair of seat support rods turnably connected at their front portions to the upper portions of said rear legs, a pair of push rods turnably connected at their lower portions to the upper portions of said front legs by second pins at the intersections therebetween, a pair of seat suspending rods turnably connected at their lower portions thereof to the rear portions of said seat support rods by third pins, said seat suspending rods being connected near their upper ends to the respective push rod by fourth pins, widthwise connecting means for interconnecting right and left sides of the baby carriage formed by said front legs, said rear legs, said seat support rods, said seat suspending rods and by said push rods, locking means arranged for fixing said baby carriage in an open state, said front legs, said rear legs, said seat support rods, said seat suspending rods, said push rods, and said widthwise connecting means having such lengths and positions that folding the baby carriage moves said rear wheels toward said front wheels and so that in the folded state, said rear wheels and said front wheels are positioned on substantially the same level, whereby the baby carriage can stand by itself, and wherein said front legs have front leg sleeves slidable thereon, said seat support rods having seat sleeves slidable thereon, and further pins journalling said front leg sleeves and said seat sleeves to each other at their intersections.

Claim 3

The baby carriage of claim 1, wherein said widthwise connecting means comprises a front leg connecting member connected between said pair of front legs and foldable at its middle, and a pair of cross rods crossing each other and turnably connected together at their intersection, said cross rods being turnably connected at their upper ends to said pair of push rods and at their lower ends to said pair of rear legs.

Claim 4

The baby carriage of claim 2, further comprising prop rods arranged between said seat sleeves and said front leg connecting member for permitting a sliding movement of said seat sleeves and a folding movement of said front leg connecting member.

Claim 5

The baby carriage of claim 2, wherein said open state locking means includes means for inhibiting said push rods from turning relative to said front legs.

Claim 6

The baby carriage claim 2, wherein said open state locking means includes means for fixing the cross angle of said pair of cross rods.

Claim 7

A baby carriage comprising a pair of front legs having front wheels on the lower portions thereof, a pair of rear legs having rear wheels on the lower portions thereof and turnably connected to said front legs by first pins at the intersections therebetween, a pair of seat support rods turnably connected at their front portions to the upper portions of said rear legs, a pair of push rods turnably connected at their lower portions to the upper portions of said front legs by second pins at the intersections therebetween, a pair of seat suspending rods turnably connected at their lower portions thereof to the rear portions of said seat support rods by third pins, said seat suspending rods being connected near their upper ends to the respective push rod by fourth pins, widthwise connecting means for interconnecting right and left sides of the baby carriage formed by said front legs, said rear legs, said seat support rods, said seat suspending rods, and by said push rods, locking means arranged for fixing said baby carriage in an open state, said front legs, said rear legs, said seat support rods, said seat suspending rods, said push rods, and said widthwise connecting means having such lengths and positions that folding the baby carriage moves said rear wheels toward said front wheels and so that in the folded state, said rear wheels and said front wheels are positioned on substantially the same level, whereby the baby carriage can stand by itself, and wherein said open state locking means lock the respective push rod against turning relative to the respective front leg with the upper end of said front leg lying substantially parallel with the lower end of said push rod, said open state locking means further comprising a slide member slidable on said respective front leg lengthwise thereof between a first position lying relatively high and a second position lying relatively low, a spring urging said slide member to return to said first relatively high position, convace and convex portions formed on an opposite portion of said slide member and said push rod, said concave and convex portions fitting together to inhibit the movement of said slide member when said slide member is at least in said second relatively low position, and an engaging wall member secured on said slide member for engaging the lower end of said push rod when said slide member is in said first relatively high position and to disengage said push rod for allowing the turning of said push rod when said slide member is in said second relatively low position.

Claim 8

A baby carriage comprising a pair of front legs having front wheels on the lower portions thereof, a pair of rear legs having rear wheels on the lower portions thereof and turnably connected to said front legs by first pins at the intersections therebetween, a pair of seat support rods turnably connected at their front portions to the upper portions of said rear legs, a pair of push rods turnably connected at their lower portions to the upper portions of said front legs by second pins at the intersections therebetween, a pair of seat suspending rods turnably connected at their lower portions thereof to the rear portions of said seat support rods by third pins, said seat suspending rods being connected near their upper ends to the respective push rod by fourth pins, widthwise connecting means for interconnecting right and left sides of the baby carriage formed by said front legs, said rear legs, said seat support rods, said seat suspending rods, and by said push rods, locking means arranged for fixing said baby carriage in an open state, said front legs, said rear legs, said seat support rods, said seat suspending rods, said push rods, and said widthwise connecting means having such lengths and positions that folding the baby carriage moves said rear wheels toward said front wheels and so that in the folded state, said rear wheels and said front wheels are positioned on substantially the same level, whereby the baby carriage can stand by itself, and wherein said open state locking means lock the respective push rod against turning relative to the respective front leg with the upper end of said front leg lying substantially parallel with the lower end of said push rod, said open state locking means further comprising a slide member slidable on said respective front leg lengthwise thereof between a first position lying relatively high and a second position lying relatively low, a spring urging said slide member to return to said first relatively high position, convace and convex portions formed on an opposite portion of said slide member and said push rod, said concave and convex portions fitting together to inhibit the movement of said slide member when said slide member is at least in said second relatively low position, and an engaging wall member secured on said slide member for engaging the lower end of said push rod when said slide member is in said first relatively high position and to disengage said push rod for allowing the turning of said push rod when said slide member is in said second relatively low position.

Claim 9

The baby carriage of claim 6, wherein said slide member has a guide wall to be urged downwardly when the baby carriage is changed from the folded to the open state, thereby sliding said slide member downwardly.

Claim 10

A foldable baby carriage comprising a pair of front legs having front wheels on the lower portions thereof, a pair of rear legs having rear wheels on the lower portions thereof and turnably connected to said front legs by first pins at the intersections therebetween, a pair of seat support rods turnably connected at their front portions to the upper portions of said rear legs, a pair of push rods turnably connected at their lower portions to the upper portions of said front legs by second pins at the intersections therebetween, a pair of seat suspending rods turnably connected at their lower portions thereof to the rear portions of said seat support rods by third pins, said seat suspending rods being connected near their upper ends to the respective push rod by fourth pins, widthwise connecting means for interconnecting right and left sides of the baby carriage formed by said front legs, said rear legs, said seat support rods, said seat suspending rods, and by said push rods, locking means arranged for fixing said baby carriage in an open state, said front legs, said rear legs, said seat support rods, said seat suspending rods, said push rods, and said widthwise connecting means having such lengths and positions that folding the baby carriage moves said rear wheels toward said front wheels and so that in the folded state, said rear wheels and said front wheels are positioned on substantially the same level, whereby the baby carriage can stand by itself, wherein said pair of push rods is constructed so that when said baby carriage is in an open state, the lower portions of said pair of push rods lie substantially parallel with the upper portions of said front legs, said baby carriage further comprising a pair of connecting members attached to said pair of push rods for permitting turning of said push rods in vertical planes, a pair of cross rods crossing each other and turnably connected together at their intersection, said cross rods being turnably connected at their upper ends to said pair of connecting members and at their lower ends to said pair of rear legs, and a widthwise connecting rod foldable upwardly at its middle and turnably connected at its opposite ends to said pair of connecting members, and wherein said open state locking means comprises a push rod locking mechanism for inhibiting said push rod from turning relative to said front leg, and a holder member secured on said push rod and adapted to abut against the upper surface of said widthwise connecting rod to inhibit the folding of said widthwise connecting rod when the turning of said push rod is inhibited by said push rod locking mechanism.

Claim 11

A foldable baby carriage comprising a pair of front legs having front wheels on the lower portions thereof, a pair of rear legs having rear wheels on the lower portions thereof and turnably connected to said front legs by first pins at the intersections therebetween, a pair of seat support rods turnably connected at their front portions to the upper portions of said rear legs, a pair of push rods turnably connected at their lower portions to the upper portions of said front legs by second pins at the intersections therebetween, a pair of seat suspending rods turnably connected at their lower portions thereof to the rear portions of said seat support rods by third pins, said seat suspending rods being connected near their upper ends to the respective push rod by fourth pins, widthwise connecting means for interconnecting right and left sides of the baby carriage formed by said front legs, said rear legs, said seat support rods, said seat suspending rods, and by said push rods, locking means arranged for fixing said baby carriage in an open state, said front legs, said rear legs, said seat support rods, said seat suspending rods, said push rods, and said widthwise connecting means having such lengths and positions that folding the baby carriage moves said rear wheels toward said front wheels and so that in the folded state, said rear wheels and said front wheels are positioned on substantially the same level, whereby the baby carriage can stand by itself, wherein said pair of push rods is constructed so that when said baby carriage is in an open state, the lower portions of said pair of push rods lie substantially parallel with the upper portions of said front legs, said baby carriage further comprising a pair of connecting members attached to said pair of push rods for permitting turning of said push rods in vertical planes, a pair of cross rods crossing each other and turnably connected together at their intersection, said cross rods being turnably connected at their upper ends to said pair of connecting members and at their lower ends to said pair of rear legs, and a widthwise connecting rod foldable upwardly at its middle and turnably connected at its opposite ends to said pair of connecting members, and wherein said open state locking means comprises a push rod locking mechanism for inhibiting said push rod from turning relative to said front leg, and a holder member secured on said push rod and adapted to abut against the upper surface of said widthwise connecting rod to inhibit the folding of said widthwise connecting rod when the turning of said push rod is inhibited by said push rod locking mechanism.

Claim 12

The baby carriage of claim 8, wherein said widthwise connecting rod and said pair of cross rods are connected to said pair of connecting members by the same pins.

Claim 13

The baby carriage of claim 8, wherein said push rod locking mechanism comprises a pair of slide members each slidable on the upper end of said front leg lengthwise thereof between a first position lying relatively high and a second position lying relatively low, a pair of springs urging said slide members to return to said first relatively high position, concave and convex portions formed on the opposed portions of said slide member and said push rod, said concave and convex portions fitting together to inhibit the movement of said slide member when said slide member is at least in said second position, and a pair of engaging members for engaging the lower end of said push rod to inhibit the turning of said push rod when said slide member is in said first relatively high position and disengaging said push rod to allow the turning of said push rod when said slide member is in said second relatively high position.

Claim 14

The baby carriage of claim 8, wherein said slide member comprises a guide wall to be urged downwardly by the lower end of said push rod when the baby carriage is changed from the folded to the open state, thereby guiding said slide member to slide downwardly.