JPS5815254Y2 - Folding stroller open lock mechanism - Google Patents

Description

[Detailed description of the invention] This invention is used in a folding baby stroller that is open when the bendable connecting rod is relatively extended and closed when it is relatively bent. and relates to a mechanism for fixing the relatively extended state of the connecting rod and locking the open state.

A folding baby carriage employs a folding mechanism using bendable connecting rods at various locations.

Such a connecting rod usually realizes an open state of the baby carriage when it is in a relatively extended state, and realizes a closed state of the baby carriage when it is in a relatively bent state.

Therefore, when the connecting rod is in a relatively extended state, if this state is fixed, the open state of the baby carriage is locked.

Further, normally, a plurality of such connecting rods are employed for one baby carriage.

In that case, a locking mechanism may be provided to lock at least one of the connecting rods.

Further, such a locking mechanism may be provided for the purpose of further improving safety.

In other words, there are cases where the stroller is locked by some other locking mechanism, and cases where the open state can be maintained naturally due to the structure of the stroller. Even in these cases, safety can be improved by providing an additional locking mechanism. .

Therefore, the main object of this invention is to provide an open locking mechanism for a folding stroller that can be advantageously mounted in conjunction with any bendable connecting rod.

Other objects and features of this invention will become clearer from the detailed description given below with reference to the drawings. Figure 1 is a perspective view showing an example of the frame structure of a baby carriage employing an embodiment of this invention. It is a diagram.

FIG. 2 is a right side view of the baby carriage shown in FIG. 1 in a closed state.

The baby carriage shown here basically consists of a pair of support leg/push rod connecting rods 1, a pair of front legs 2, a pair of rear legs 3, a pair of push rod bodies 4, and a pair of push rods. The left and right side surfaces are defined by the rod support angle 5 and a pair of folding interlocking connecting rods 6.

Between the above-mentioned elements defining the left and right sides, there are a bendable front leg connecting rod 7 and a rear leg connecting rod 8.
, a push rod connecting rod 9, and a central connecting rod 10 are connected.

Each such element is indicated by arrows 11, 12, 13, .
By bending, rotating or displacing in directions 14, 15, 16 and 17, the closed state shown in FIG. 2 is realized.

In a baby carriage with such a folding mechanism, the front leg connecting rod is used as a bendable connecting rod that brings about an open state when it is relatively extended and a closed state when it is relatively bent. 7, there are a rear leg connecting rod 8, a push rod connecting rod 9 and a central connecting rod 10.

Is the locking mechanism of this invention based on these connecting rods? , 8, 9.1
It can be attached to either 0.

In consideration of the operability of this locking mechanism, a case where the locking mechanism is attached to the rear leg connecting rod 8 will be described below.

FIG. 3 is a perspective view of the main parts of the locking mechanism of the baby carriage shown in FIG. 1, viewed from the upper rear.

In FIG. 3, the bending of the central connecting rod 10 in the direction of arrow 17 and the bending of the rear leg connecting rod 8 in the direction of arrow 12 are configured to interlock with each other.

That is, a pair of tension rods 18 arranged in a V-shape are connected between the rear leg connecting rod 8 and the central connecting rod 10.

Note that the directions of arrows 12 and 17 are for each connecting rod 8, 9.
It will be understood from the fact that when the stroller is bent and the stroller is brought into the closed state, the rear leg connecting rod 8 and the central connecting rod 10 are displaced toward each other as shown in FIG.

As the arrangement is shown in FIG.
Reference numeral 9 is provided in relation to the bent portion of the rear leg connecting rod 8.

4 to 6 show such a locking mechanism 19 from the rear in an enlarged manner, and FIG. 4 shows the locking mechanism 19 in the open state and the locked state;
FIG. 5 shows the open and unlocked state, and FIG. 6 shows the closed state.

Both ends of the rear leg connecting rod 8 are connected via a connecting pin 21 by a connecting tool 20 attached to each rear leg 3.

Preferably, anti-rotation pieces 22 are provided at both ends of the rear leg connecting rod 8.
is formed, whereby the hind leg connecting rod is aligned with the arrow 12 mentioned above.
The structure is such that it can be bent only in one direction.

Next, the locking mechanism 19 and its related configuration will be explained with reference mainly to FIGS. 4 and 5 showing the open state.

The rear leg connecting rod 8 includes one connecting rod portion 24 and the other connecting rod portion 25 that are connected to each other via a first pivot pin 23 .

The first pivot pin 23 includes a portion protruding from the side surface of the rear leg connecting rod 8.

A long hole 26 into which the protruding portion of the first pivot pin 23 is received.
is provided on the lock lever 27.

The elongated hole 26 is formed with three ends, a lock end 28, a release end 29, and a closed state end 30, which are different from each other.
extending in one direction.

Second and third pivot pins 31 and 32 are respectively positioned on each connecting rod portion 24 and 25 at positions separated by a predetermined distance on both sides of the first pivot pin 23.

A pair of control connecting links 33, 34 are rotatably supported by the second and third pivot pins 31, 32.

The respective distal ends of each of the control connecting links 33 and 34 are rotatably connected to each other by a fourth pivot pin 35.

The fourth pivot pin 35 has a portion that projects from the surface of the control link 33.34.

The control link 33, 34 is for controlling the attitude of the lock lever 27.

A fifth pivot pin 3 is attached to the projecting portion of one control link 33.
6, by which the lock lever 27 is rotatably supported.

The protruding portion of the fourth pivot pin 35 described above is connected to the lock lever 2.
7 through the relief hole 37 provided in the lock lever 27.
protrudes further from the surface of

The escape hole 37 is for allowing relative displacement between the fourth pivot pin 35 and the lock lever 27.

A spring locking portion 38 is provided on the surface of the lock lever 27, for example, by a pin.

A tension spring 39 is provided between the spring locking portion 38 and the fourth pivot pin 35 .

Fourth pivot pin 35, fifth pivot pin 36, and spring locking portion 38
The positional relationship with is selected as follows.

A fifth pivot pin 36 is located between the fourth pivot pin 35 and the spring locking portion 38 .

The tension springs 39 can be selectively positioned on both sides of the fifth pivot pin 36 when the rear leg connecting rod 8 is in a relatively extended state.

That is, the position of the tension spring 39 with respect to the fifth pivot pin 36 is opposite between the state shown in FIG. 4 and the state shown in FIG.

Due to the bias of the tension spring 39, the lock lever 27 is
It is selectively urged to rotate in both directions about the fifth pivot pin 36.

As a result, there is a certain consideration in the rotation of the lock lever 27.

The lock end 28 and release end 29 of the elongated hole 26 are determined from the rotational manner of the lock lever 27 and the relationship with the first pivot pin 23.

Moreover, the shape of the path leading to the closed state end 30 of the elongated hole 26 is as follows:
When the rear leg connecting rod 8 is in a relatively bent state, the first
When the pivot pin 23 is guided from the open end 29 to the closed end 30 and the rear leg connecting rod 8 is again in the extended state, the first
The pivot pin 23 is chosen to be guided from the closed end 30 to the locking end 28 .

The operation and operation of the locking mechanism 19 will be explained with reference to FIGS. 4 to 6.

In the state shown in FIG. 4, the first pivot pin 23 is fitted into the lock end 28 of the elongated hole 26, and the lengths of the first pivot pin 23 and the fourth pivot pin 35 are fixed.

Therefore, the angles of both control connecting links 33, 34 are fixed, and one connecting rod portion 24 and the other connecting rod portion 25 of the rear leg connecting rod 8 cannot rotate relative to each other around the first pivot pin 23. be.

That is, the length between both ends of the rear leg connecting rod 8 is fixed, and the baby carriage is in an open state of 7% closed.

In this state, as shown in FIG. 4, the tension spring 39 is on the left side of the first pivot pin 23 in the drawing, so that the lock lever 27 rotates clockwise about the fifth pivot pin 36. is biased to ensure that the first pivot pin 23 remains engaged with the locking end 28.

To unlock the lock mechanism 19 described above, the lock lever 27 may be rotated counterclockwise about the fifth pivot pin 36 against the pressure of the tension spring 39.

As is clear from Figures 1 to 3, this operation
Since the locking mechanism 19 is provided relatively lower and rearward of the baby carriage, the person pushing the baby carriage can easily do this by kicking the lower end of the locking lever 27 with one foot.

As a result of such an operation, the unlocked state shown in FIG. 5 is obtained.

FIG. 5 shows a state in which the rotation of the lock lever 27 has exceeded the point shown in FIG. 4, and the tension spring 39 is in the fifth position.
It is located on the right side of the pivot pin 36 in the drawing.

Therefore, at the end of the rotation of the lock lever 27 in this direction, the tension spring 39 acts to force the lock lever 27 to rotate counterclockwise.

In FIG. 5, the first pivot pin 23 fits into the open end 29 of the slot 26. In FIG.

In other words, it is in an unlocked state.

When the first pivot pin 23 is at the open end 29, the elongated hole 26
provides an unobstructed path to the closed end 30 for the first pivot bin 23.

Therefore, the rear leg connecting rod 8 can be in a relatively bent state.

Between the state shown in FIG. 5 and the state shown in FIG. 6, the rear leg connecting rod 8 is bent downward as indicated by the arrow 12 (FIGS. 1 and 3).

Accordingly, both control connecting links 33, 34 are relatively raised upward, and the first pivot pin 23 and the fifth
The pivot pins 36 are provided at positions far apart from each other in the vertical direction.

During this process, the lock lever 27
3 and the elongated hole 26, it can be rotated clockwise about the fifth pivot pin 36.

Accordingly, the fifth pivot pin 36 is brought into a position to the right of the tension spring 39 according to the drawing.

Finally, the state shown in FIG. 6 is reached.

In the state shown in FIG. 6, the lock lever 27 is attached to the fifth pivot pin 3.
It is urged to rotate clockwise about center point 6 by a tension spring 39.

When the rear leg connecting rod 8 is brought into the extended state again from this state, the first pivot pin 23 is displaced within the elongated hole 26 along the right edge of the elongated hole 26 in the drawing.

Therefore, when the open state of the baby carriage shown in FIG. 4 is obtained, the first pivot pin 23 is automatically guided toward the lock end 28 and is fitted therein.

This achieves locking in the open position.

In the embodiment described above, the locking mechanism 19 is attached to the rear leg connecting rod 8.
However, a similar locking mechanism can also be attached in a similar manner to, for example, the front leg connecting rod 7, the push rod connecting rod 9, the central connecting rod 10, etc. shown in FIG. I can do it.

Furthermore, the baby carriage shown in FIGS. 1 and 2 is configured such that its open state is maintained even without a locking mechanism 19, and this locking mechanism 19 has the significance of increasing safety. there were.

However, such a locking mechanism can also be added to a baby carriage whose open state is maintained only by the locking mechanism.

As described above, the invention provides an open locking mechanism that can be advantageously mounted in conjunction with a bendable connecting rod.

In this locking mechanism, the shape of the elongated hole and the positional relationship between the tension spring and the pivot pin that rotatably connects the lock lever are selected in a specific manner, making it easy to release the tank. And automatic locking is possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the frame structure of a baby carriage to which an embodiment of this invention is adopted. FIG. 2 is a right side view of the baby carriage shown in FIG. 1 in a closed state. FIG. 3 is a perspective view of the main parts of the locking mechanism of the baby carriage shown in FIG. 1, viewed from the upper rear. 4 to 6 are enlarged views of the locking mechanism of the baby carriage shown in FIG. 1 from the rear, with FIG. 4 showing the open state in the locked state, FIG. 5 showing the open state in the unlocked state, and FIG. Figure 6 shows the closed state. In the figure, 8 is a rear leg connecting rod as a bendable connecting rod, 19 is a locking mechanism, 23 is a first pivot pin, 24 is one connecting rod portion, 25 is the other connecting rod portion, 26 is a long hole,
27 is a lock lever 128 is a lock end, 29 is a release end, 30 is a closed state end, 31 is a second pivot pin, 32 is a third pivot pin, 33, 34 is a control connection link, 35 is a fourth
Pivot pin, 36 is the fifth pivot pin, 38 is the spring engagement part, 3
9 is a tension spring.

Claims (2)

[Scope of utility model registration request] (1) Used in a folding baby stroller that is in an open state when the bendable connecting rod is in a relatively extended state and in a closed state when it is in a relatively bent state; A mechanism for fixing the extended state and locking the open state, wherein the connecting rod has one connecting rod portion and the other connecting rod portion that are connected to each other via a first pivot pin serving as a bending portion. The first pivot pin includes a portion protruding from the connecting rod, and the locking mechanism receives the protrusion portion of the first pivot pin to form a locked end, a released end, and a closed state end. a lock lever having an elongated hole, and second and third pivot pins located on the one and the other connecting rod portions, respectively, at positions separated by a predetermined distance on both sides of the first pivot pin. , a pair of sides rotatably supported by the second and third pivot pins and rotatably interconnected at each end by a fourth pivot pin for controlling the attitude of the lock lever; a split connecting link; a fifth pivot pin provided on the one control connecting link and rotatably supporting the lock lever; a spring locking portion provided on the lock lever; and a spring locking portion provided on the lock lever. A tension spring is provided between the stop portion and the fourth pivot pin, and the positional relationship between the fourth pivot pin, the fifth pivot pin, and the spring locking portion is the same as that of the fourth pivot pin. The fifth pivot pin is located between the spring locking portion and the tension spring is selectively located on both sides of the fifth pivot pin when the connecting rod is in a relatively extended state. Accordingly, the biasing of the tension spring selectively biases the locking lever to pivot in both directions about the fifth pivot pin, whereby the pivoting of the locking lever is selectively biased. the elongated hole receives the protruding portion of the first pivot pin in response to rotation of the lock lever in both directions about the fifth pivot pin; guiding a pivot pin to either a lock end or a release end, and when the first pivot pin is at the lock end, a length between the first pivot pin and the fourth pivot pin is fixed; When the locked state is obtained and the first pivot pin is at the open end, the path to the closed state end is open and the connecting rod can be in a relatively bent state, and the connecting rod is bent. When the state is reached, the lock lever is rotated so that the first pivot pin reaches the end of the closed state and exceeds the point, and when the connecting rod is in the extended state again, the first pivot pin is in the closed state. An open locking mechanism for a folding baby carriage, the shape of which is chosen such that a pin is automatically guided to said locking end. (2) An open state locking mechanism for a foldable baby stroller according to claim 1, wherein the connecting rod is connected between a pair of rear legs whose mutual spacing is changed according to opening/closing operations. .