JP3316262B2 - Infant restraint protection sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infant restraint protection sheet, and more particularly to a seat restraint protection seat for a vehicle or an airplane. The present invention relates to an infant restraint protection sheet that reliably restrains and protects a seated infant.

[0002]

2. Description of the Related Art In an automobile or an aircraft, for example, the occupant maintains a sitting posture during driving or flying.
A seat belt device is provided to protect an occupant from an impact during sudden acceleration / deceleration. In such a seat belt device, the belt length and the like are set according to the body shape of an adult similarly to the size of the seat, so that the child, particularly the infant, is not effectively protected. Therefore, various types of restraint protection sheets for infants have conventionally been developed and used. This kind of restraint protection sheet for infants has a seat body formed with a seating surface on a rigid resin seat frame which is reclineably attached to a base member placed on the seat, and seated on the seat body. A seatbelt device for an infant for restraining displacement (movement) of the infant in the state, and a webbing of the seatbelt device mounted on the seat (hereinafter referred to as a Japanese Industrial Standard as defined in Japanese Industrial Standards). A woven belt made of an ordinary fiber material having a width of about 50 mm is referred to as a webbing.) The infant restraint protection sheet is firmly fixed to the seat and used.

The conventional child restraint protection sheet has a seat frame portion made of a substantially L-shaped integral part formed by resin molding or the like, and this kind of child restraint protection sheet becomes quite large as a whole. There was a problem with the attachment / detachment and transportation at times. Therefore, in order to solve such a problem, the applicant provided a hinge between the seat back portion and the seating portion, folded the seat back portion so as to cover the seating portion, and made the structure easy for carrying for an infant. A restraint protection sheet has already been filed (see Japanese Patent Application No. 3-322094). According to the application, the seat back rotation control device provided with the lock mechanism can set and hold the seat back portion at a predetermined angle during normal use, and can maintain the folded state when folded. . When using this type of restraint protection sheet for infants, the base portion supporting the seating portion is fixedly held on the seat using the seat belt device of the seat when the seat is used.

FIG. 6 shows a state in which the above-described infant restraint protection sheet 50 is fixed to the seat S. In the figure, reference numeral 51 denotes a lower shell. The lower shell 51 is a resin molded product having such rigidity that a stable state can be maintained when the infant restraint protection sheet 50 is placed on the seat S, and will be described later. The load from the jump seat 52 is uniformly supported. In addition, a rotation support portion 53 that forms a hinge is formed on the rear end both sides 51a. The rotation support portion 53 has a thin cylindrical shape,
A seat back rotation control device (not shown) capable of setting and holding the seat back portion 54 inside the rotation support portion 53 and the lower shell 51 every time the seat back portion 54 is biased and held at the locking position by a predetermined angular elastic member. ) Is housed.

[0005] On the other hand, the jump seat 52 is a member on which an infant is directly seated. The surface of the jump seat 52 is constituted by a gentle curved surface, and the rear end portion thereof is rotatably supported by the rotation support portion 53.
At the time of normal use, it is placed on the lower shell 51 and constitutes an infant seating unit integrally with the lower shell 51. When fixing the infant restraint protection sheet 50 at a predetermined position on the seat, the jump seat 52 is turned around the turning support portion 53 and lifted as shown in FIG. Lower shell 51
Is fastened to the seat, so that the entire child restraint protection sheet is firmly fixed to the seat.

[0006]

By the way, as described above, in a state in which the jump seat for seating the infant can be lifted freely, the jump seat is lifted even if the infant is jolted up and shakes the body up and down, and rattling is easily generated. Not comfortable to sit on. If a collision or the like occurs while the infant is seated on this jump seat, the infant is restrained from moving forward by the infant seat belt device. There is a risk that the jump sheet will pivot and float with respect to the pivot support. Therefore, the infant wearing the infant seat belt device is lifted up together with the jump seat,
There is also the problem that the performance of restraining the movement of the infant during a collision is reduced.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a lock mechanism between a seat body and a jump seat so as to enhance restraint performance of a seated infant. To provide a child restraint protection sheet.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a seat portion on which an infant is seated, and the seat portion is rotatably connected to the seat portion via a rear end rotating shaft. And a restraint means for restraining and protecting the movement of the infant when seated,
In a child restraint protection seat for fixing an occupant restraint seatbelt device by placing it on a seat, the seat portion is rotatably connected to the rear-end rotation shaft, and the infant is secured to the seat. An upper member directly seated, a lower member that supports the upper member and is tightened onto the seat by the occupant restraint seat belt device, and the upper member is fixed to the lower member so that the upper member can be locked and released. And holding means for holding.

In this case, the locking means includes a crankshaft pivotally attached to one of the members via a support bracket,
A locking projection provided at a position opposite to the crankshaft of the other member, wherein the engagement between the locking projection and the crankshaft is changed according to the direction of action of the acting force acting on the seat portion. It is preferable that a locking operation or a locking operation between the locking projection and the support fitting be performed. Preferably, the locking means rotates the crankshaft biased and held at the locking position by an elastic member in a predetermined direction to release the locking with the locking projection.

[0010]

According to the present invention, an upper member on which the seat portion is rotatably connected to the rear end rotation shaft and on which the infant is directly seated, and which supports the upper member and is placed on the seat. The lower member is separated from the lower member, and the upper member is fixedly held to the lower member via locking means. Therefore, it is possible to reliably prevent the upper member from rising, etc. When the protective seat is fixed to the seat, the upper member is lifted by the releasing operation of the locking means, and only the lower member can be reliably fixed to the seat position by the occupant restraining seat belt device.

In this case, the locking means may be configured such that a crankshaft is swingably attached to one of the members via a support bracket, and a locking projection is provided on the other member at a position facing the crankshaft. Thereby, in the case of front facing, the upper member is fixedly held by the locking operation between the locking projection and the crankshaft, and in the case of rear facing, the locking projection and the support fitting abut, As a result, the movement of the upper member is prevented, and the lock mechanism functions. In addition, the locking means can release the locking with the locking projection by rotating the crankshaft biased and held at the locking position by an elastic member in a predetermined direction, so that the locking means is normally used. Can be securely locked, and when the lock is released, the lock of the upper member can be released by a simple lever operation, and the upper member can be lifted in that state.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an infant restraint protection sheet according to the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing a state in which a jump sheet of an infant restraint protection sheet according to the present embodiment is lifted. The structure of the infant restraint protection sheet 1 will be described with reference to FIG. The infant restraint protection sheet 1 includes a seat portion 2 constituting a seat body that can be stably placed on the seat S, and a rotation support portion 3 formed at a rear end portion of the seat portion 2. A seat back portion 4 rotatably attached to the seat back portion, a seat back rotation control device (not shown) for controlling reclining of the seat back portion 4, and a device for restraining an infant seated on the seat portion 2. (A part of the shoulder belt 6 is shown in this drawing), and a shoulder belt position adjuster (see FIG. 1) for vertically adjusting the shoulder position of the shoulder belt 6 of the infant seat belt device. (Not shown)).

The seat portion 2 includes a lower shell 10 and a jump seat 11 rotatably attached to the lower shell 10 via a rotation support portion 3. The lower shell 10 has a front portion 10A having a substantially trapezoidal side shape as shown in FIG. 2, and a rear portion having a triangular side shape and the above-described rotation support portion 3 formed at a rear end portion. Part 1
0B and a saddle portion 10C connecting the front portion and the rear portion. Front part 10 of lower shell 10
A generally U-shaped recess 10 at the center of the front of A
In this portion, an operation handle 12 for performing reclining adjustment of the above-described seat back rotation control device is disposed. Further, a link mechanism connected to the operation handle 12 and transmitting an operation force to the seat back rotation control device is also accommodated in the lower shell 10 (not shown). Near the both ends of the saddle portion 10C, approximately T
A letter-shaped locking projection 43 (its configuration will be described later) is protruded. The locking projection 43 is used for a crank lever 2 to be described later.
0 and lock the jump seat 11 with the lower shell 1
It constitutes a part of the wrap anchor plate 40 fixed to zero.

On the other hand, as shown in FIG. 2, the jump seat 11 is formed with a notch 14 so that a part of the front surface 11a and a part of the seating surface 11b are branched into two.
A crotch belt (crotch belt) fixed to a part of the belt 0 and connected to the buckle device is inserted therethrough. Side walls 15 are formed on both sides of the seating surface 11b, so that the movement of the seated infant to the side can be restrained.
Further, on the lower surface of the jump seat 11, the lower shell 10 is provided.
Of the cover 16 over the entire width at a position facing the saddle portion 10C.
Are integrally formed. Inside the cover 16, a crank lever 20 shown in FIG. 2 and a crank guide base 30 for swingably supporting the crank lever 20 are provided.
Is housed. Details of the structure will be described later.

As shown in FIG. 1, the seat back portion 4 is attached to the lower shell 10 via the rotation support portion 3 so as to be reclineable, and side wall portions 17 are formed on both sides thereof. With this portion, the head can be safely protected when the infant's head swings right and left. Further, a shoulder belt 6 of the infant seat belt device extends from the backrest portion, and the height of the shoulder position is adjusted by a shoulder belt position adjuster adjustment device (not shown) provided on the back side of the seat back portion 4. It can be adjusted up and down.

Next, the jump sheet 11 is attached to the lower shell 1.
The structure of the lock mechanism for preventing the lock mechanism from being lifted from zero will be described with reference to FIGS. FIG. 2 is an exploded perspective view of components constituting a lock mechanism attached to the jump seat 11 and the lower shell 10. In the figure, a crank lever 20 is provided on the lower surface of the jump seat 11.
And a crank guide base 30 that rotatably supports the crank lever 20, while a lap anchor plate 40 that locks a part of the crank lever 20 is fixed to the lower shell 10. ing.

As shown in FIGS. 2 and 3, both ends of the crank lever 20 are bent at approximately 90 degrees, and an operating lever 21 having a grip 21a attached to the end thereof and a predetermined operation by the swinging operation of the operating lever 21 are provided. Rotating shaft 22 that rotates by an angle
And a crankshaft 23 bent and formed at a predetermined offset. Further, a ring portion 26 of a spring guide 25 made of resin is loosely fitted at a substantially central position of the crankshaft 23. As shown in FIG. 2, the spring guide 25 is a molded part in which a block 27 having a sharp end is formed integrally with a ring portion 26 having a substantially rectangular cylindrical shape. A part of the coil spring 28 is fixed to the coil spring 28. As shown in FIG. 4, the block portion 27 of the spring guide 25 is slidably fitted and supported on a spring accommodating portion 16a of the cover 16 formed on the lower surface of the jump sheet 11.

The rotating shaft 22 of the crank lever 20 is locked in a substantially U-shaped notch 32 formed on a support projection 31 of the crank guide base 30. Therefore, by raising and lowering the operating lever 21 of the crank lever 20 by a predetermined angle, the crank shaft 23 can be swung by the predetermined angle with respect to the notch 32. As shown in FIGS. 2 and 3, the crank guide base 30 is a plate-like member obtained by bending a plate having a predetermined shape, and both ends 30a are bent to form support projections 31. Further, in plan view, it has a substantially U-shape to secure a clearance when the crankshaft 23 of the crank lever 20 swings, and a predetermined notch 33 to avoid interference with the locking projection 43 of the lap anchor plate 40. Are formed. The crank guide base 30 is the cover 1 on the lower surface of the jump seat 11 described above.
6 is fixed with a set screw so as to be fitted and accommodated in a predetermined position.

As shown in FIGS. 2 and 3, the lap anchor plate 40 is a plate-like member obtained by bending a plate having a predetermined shape in the same manner as the crank guide base 30.
Are bent along the longitudinal direction, and a substantially T-shaped locking projection 43 having projecting portions 42a and 42b whose upper surface 41 is slightly inclined is formed at the front end of the bent portion. By locking the crankshaft 23 of the crank lever 20 to the locking projection 43, the floating of the jump seat 11 can be locked. The lap anchor plate 40 is fixed to the lower surface of the lower shell 10 by a set screw, and the locking projection 43 partially projects on the upper surface of the saddle portion 10C of the lower shell 10 through a slit 10a provided at a predetermined position of the saddle portion 10C of the lower shell 10. It has become.

Referring to FIGS. 3A and 3B, the positional relationship of each member will be briefly described. FIG. 2A shows a state in which the operation lever 21 of the crank lever 20 is in a horizontal position, and at this time, the crankshaft 23 is located substantially below the rotation shaft 22 (see FIG. 2B). As shown in FIG. 3C, the rear end projection 42 of the locking projection 43 of the lap anchor plate 40 is provided.
b, the jump seat 1
1 is in a locked state. The coil spring 28 mounted on the spring guide 25 is in a no-load state.

Next, referring to FIG.
The movement of the crankshaft 23 of the crank lever 20 at the time of locking and unlocking will be described in relation to the locking projection 43 of the lap anchor plate 40. FIG. 1I shows that the lower shell 1 is tilted down from the state in which the jump sheet 11 is opened.
This shows the state immediately before locking to zero. At this time, the crankshaft 23 of the crank lever 20 is in contact with the upper surface 41 of the front projection 42a of the locking projection 43 of the lap anchor plate 40. When the jump seat 11 is pressed against the lower shell 10 from this state, the crankshaft 23 rotates around the rotation shaft 22 so as to slide downward (in the direction of arrow A) along the upper surface of the locking projection 43. At the same time, the ring 26 of the spring guide 25 is pressed, and the main body of the spring guide 25 slides in the spring accommodating portion 16a in the direction of arrow A 'in the figure against the urging force of the coil spring 28 (see FIG. 2 (II)). .

Further, when the crankshaft 23 moves to the rear of the rear projection 42b of the locking projection 43 and comes off the upper surface 41 of the locking projection 43, the spring guide 25 is moved by the biasing force of the coil spring 28 in FIG. , The crankshaft 23 rotates downward of the rear protrusion 42b of the locking projection 43, and abuts against the rear surface of the locking projection 43 below the protrusion 42b to be locked.

When the jump seat 11 is lifted, the operation shaft 21 is raised in the direction of arrow C as shown in FIG.
2, the latch between the crankshaft 23 and the locking projection 43 is released, and the jump seat 11 can be lifted upward. At this time, the spring guide 25 slides in the direction of the arrow A 'in the spring accommodating portion 16a, and the coil spring 28 is urged.
When the crankshaft 23 is released from the position a, the crankshaft 23 is again rotated to the position shown in FIG.

Next, the locking operation when the child restraint protection seat is attached to the seat in each state will be described with reference to FIG. When the child restraint protection sheet is fixed to the seat with the rear facing (when rear facing)
In the case where the child restraint protection sheet 1 is fixed to the seat in the traveling direction (at the time of front facing), a state in which an inertial force due to a collision or the like is applied will be described.

FIG. 2A shows a locked state during rear facing. In FIG. 2A, the left side in the figure is the seat back portion, and is the front side of the automobile. Therefore, in the case of a frontal front collision or the like, the jump sheet 11 tends to move in the direction of arrow C in the figure due to the inertial force. At this time, the crankshaft 23 of the crank lever 20 acts in the releasing direction from the locking projection 43, but the entire jump sheet 11 moves in the C direction, so the front surface 43 a of the locking projection 43 and the notch 33 end face of the crank guide base 30. Abuts at point D. Therefore, the lock mechanism functions in this portion, and the jump seat 11 is prevented from floating. When the jump sheet 11 is rotated around a rotation support portion (not shown) to open and close, the locus of the point D of the crank guide base 30 is indicated by a two-dot chain line.
It does not interfere with the locking projection 43.

FIG. 2B shows a locked state during front facing. In FIG. 2B, the left side in the figure is the seat back portion, and the right side is the front side of the automobile. Therefore, in the case of a frontal front collision or the like, the jump sheet 11 tends to move in the direction of arrow B in the figure.
At this time, the crankshaft 23 of the crank lever 20 abuts on the locking projection 43 as shown in the figure, and the locking mechanism functions at this portion.

Further, as shown in FIG. 3C, the jump sheet 11 is slightly lifted even if the jump sheet 11 is lifted in a normal state during normal use, or if the infant jumps playfully. When the crankshaft 23 is in the state, the lower surface (E
Point). As a result, the lock mechanism functions, and the jump seat 11 cannot be lifted further upward.

In the above description, the crankshaft of the crank lever is moved by the urging force of the coil spring 28 as shown in FIG.
Is held as an initial position, but a mechanism for holding the operation lever at a position where the jump seat is locked (at the position (IV) in FIG. 4) may be provided to perform each operation. . Also, it goes without saying that the same locking operation can be realized even if the mechanism of the crank lever is provided on the lower shell side and the locking projection is provided on the jump seat.

As is apparent from the above description, according to the present invention, the jump-seat locking mechanism is surely secured against a force from each direction acting in accordance with the fixed state of lifting the jump-seat. Is activated, so that the comfort at the time of sitting is improved and the seated infant can be reliably restrained and protected.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an infant restraint protection sheet according to the present invention.

FIG. 2 is a partially exploded perspective view showing an example of a lock mechanism of a jump seat of the restraint protection sheet for infants of the present invention.

FIG. 3 is an explanatory diagram showing a positional relationship of the lock mechanism shown in FIG. 2;

FIG. 4 is an operation sequence diagram showing an example of an operation of each member in a lock operation and a lock release operation.

FIG. 5 is a partial schematic cross-sectional view showing a difference in a lock mechanism due to a difference in a state of fixing the child restraint protection sheet to the seat.

FIG. 6 is a schematic perspective view showing an example of a configuration of a jump sheet of a conventional infant restraint protection sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Infant restraint protection sheet 3 Rotation support part 4 Seat back part 10 Lower shell 11 Jump seat 20 Crank lever 21 Operation lever 23 Crank shaft 25 Spring guide 28 Coil spring 30 Crank guide base 31 Support projection 40 Lapping anchor plate 43 Lock projection S Seat

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60N 2/28 B60R 22/10

Claims (3)

(57) [Claims] 1. A seat portion on which an infant is seated, a seat back portion rotatably connected to the seat portion via a rear end rotating shaft and holding the infant from the back, and movement of the infant when seated. Child restraint means for restraining and protecting the child,
In an infant restraint protection sheet for securing an occupant restraint seat belt device by being placed on a seat, the seat portion is rotatably connected to the rear end rotation shaft, and the An upper member directly seated, a lower member that supports the upper member and is tightened onto the seat by the occupant restraint seat belt device, and the upper member is fixed to the lower member so that the upper member can be locked and released. An infant restraint protection sheet comprising: a retaining means for holding. 2. The locking means according to claim 1, wherein said locking means comprises: a crankshaft pivotally attached to one member via a support bracket; and a locking projection provided on the other member at a position facing said crankshaft. A locking operation between the locking projection and the crankshaft or a locking operation between the locking projection and the support fitting in accordance with the direction of action of the acting force acting on the seat portion. 2. The child restraint protection sheet according to claim 1, wherein the operation is performed. 3. The locking device according to claim 1, wherein the locking means rotates the crankshaft biased and held at a locking position by an elastic member in a predetermined direction to release the locking with the locking projection. The child restraint protection sheet according to claim 2, characterized in that: