The present invention relates to a pocket coil structure that accommodates each morning glory spring in a large number of continuous bag portions and is arranged in a flat plate shape.
Conventionally, as a spring structure used for a bed mattress, a pocket coil structure in which barrel-shaped springs are accommodated in a large number of continuous bags and arranged in a flat plate shape is known (for example, Japanese Patent Publication No. 56-36931).
Those having the above-described pocket coil structure are connected to an adjacent bag by bonding or the like at the center in the height direction of the bag, and the pocket coil itself is housed in the bag, and is not connected. Therefore, the contact point between the coils is the central portion in the height direction, which is the maximum diameter portion of the barrel spring, and the upper and lower portions of the coil are free, only the coil at the point where the load is applied is bent and adjacent It has a cushioning property that does not affect the coil.
However, since the bag to be housed is formed by folding a continuous band-shaped cloth into two in the width direction and heat-welding the ends, and linearly heat-welding the length direction at a constant pitch to form the bag portion. The shape of the bag and the barrel coil do not match, and the upper and lower portions of the bag are larger than the barrel coil size. Therefore, when a load was repeatedly applied during actual use, the barrel-shaped coil danced in the bag, and the coil was caught on the winding diameter of the adjacent coil or became inclined, and the load was removed. Later, the barrel- shaped coil did not return to normal, which often resulted in a shape failure or a state in which the portion where the load was applied was dented and did not return.
[Problems to be solved by the invention]
An object of the present invention is to provide a pocket coil structure in which a coil accommodated in a bag portion is formed as an Asagao coil so that play between adjacent coils is eliminated and a shape defect does not easily occur.
[Means for Solving the Problems]
Each of the morning glory coil springs 2, 2 ', ... Is accommodated in a large number of continuous bags 1, 1',..., And the adjacent morning glory coil springs 2, 2 'are vertically inverted. as a flat plate in sequence to a pocket coil structure composed of a spring column 3, to the first welder unit 9 so that the shape of the adjacent bag 1,1 '... is reversed trapezoidal shapes The second welder portion 10 is not vertical but is inclined, and the next second welder portion 10 'is inclined reversely, and the adjacent morning glory coil springs are connected via the bags 1 , 1 ',. A pocket coil structure comprising an Asagao coil spring, wherein upper and lower portions of 2, 2 'are in linear contact with each other .
Flat in aligned bags 1, 1 'flared coil spring accommodated in the ... 2,2' ..., the upper and lower flared coil spring 2,2 '... each adjacent Are in the opposite combination, the upper and lower portions are in linear contact with each other via the bags 1, 1 '..., And there is no play between the morning glory coil springs 2 and 2'. Does not occur, and does not lose its shape .
In addition, since there is no play between the morning glory coil springs 2 and 2 ', the morning glory coil spring 2 is forced to bend upward and downward against a load, and can exhibit normal cushioning characteristics.
To illustrate embodiments of the present invention with reference to the drawings, as shown in FIG. 1, the flared coil spring 2 is enclosed in a large number of bags 1, 1 '... in which successive bags 1 whose adjacent , 1 .... 'flared coil springs 2,2 in ...' are sealed to the upper and lower relation is reversed, successive bags 1, 1 'flared into .... The row of springs 3 enclosing the coil springs 2 and 2 'are folded back in the width direction of the mattress (returning is not limited to the width direction of the mattress, but may be in the length direction). A pocket spring seat 4 is formed.
Frame lines 5 are arranged on the upper and lower outer peripheries of the pocket spring seat 4 and are fixed to the morning glory coil springs 2, 2 'by hook rings 6, 6'.
Next, as shown in FIG. 2, the asagao coil springs 2, 2 ',... , 8 'are heat-welded with a high-frequency welder to form a first welder portion 9. After being formed into a cylindrical shape, the Asagao coil spring 2 is inserted into the cylindrical shape in a compressed state, and is similarly vertically welded by heat welding. Are formed by forming two welders 10 and 10 'and partitioning the inside of the cylinder to form continuous bags 1, 1'... The second welder portion 10 is not perpendicular to the first welder portion 9 but is inclined so as to have a trapezoidal shape opposite to each other, and the next second welder portion 10 'is inversely inclined.
The morning glory type coil spring 2,2 '.... adjacent when'll wake flared coil spring 2, which is sealed in a compressed state sequentially flared adjacent as shown in FIG. 2 by the raised inverse Are housed in successive bags 1, 1 ',... So that the coil springs 2, 2',.
There is no space for morning glory type coil spring 2 in the shape was a trapezoid, such as to conform to the shape of the flared coil spring 2 of the bag 1 is dancing in the bag 1, forming a pocket spring seat 4 stable not to cause a deformation can do.
As described above, the shape of the bag 1 is preferably trapezoidal. However, as shown in FIG. 3, the first welder portion 9 and the second welder portions 10 and 10 'may be in a vertical relationship.
The spring rows 3, 3 ',... Adjacent to each other in a meandering manner are hot-melt adhesives 11, 11', between the bags 1, 1 ', which correspond to the center in the height direction of the morning glory coil spring 2, as shown in FIG. Are connected.
Same will be described below. Another embodiment, a number of bags 1, 1 'width of the mattress length of ... is rock continuous, and a length of the flared coil spring 2 in the bag 1 a plurality of fixed length of the spring string 3, 3 accommodated in direction 'form a ...., which as shown in FIG. 5, the adjacent spring columns 3,3' flared coil by the upside down The pockets 1 and 1 'which correspond to the center of the spring 2 may be connected to each other by hot melt bonding 11, 11'... To form a pocket spring seat 4.
【The invention's effect】
In the case of the present invention, the Asagao coil spring 2 is applied as the coil of the pocket coil structure, and the positional relationship between the adjacent Asagao coil springs 2, 2 ′ is assembled upside down. Since the point of contact between adjacent coils becomes a line contact with respect to the point contact of the conventional barrel-shaped coil, when applied to a mattress pocket spring structure, it is subject to repeated loads in actual long-term use. , does not occur a phenomenon that dancing flared coil spring 2 in the bag 1, or a state of obliquely between adjacent coils, without be caught winding径同mechanic coils, morning glory type coil spring 2 is a regular Stable so that the dent does not return after the load is removed or the mattress itself does not deform because it is forced to deform between the top and bottom It is possible to provide a pocket coil structure was.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing one embodiment of the present invention.
FIG. 2 is a partially enlarged view of a spring row 3 showing the shape of the bags 1, 1 'of FIG. 1 and the accommodation relationship of the morning glory coil springs 2, 2'.
FIG. 3 is a partially enlarged view of a spring row 3 showing another embodiment of the shape of the bag 1.
FIG. 4 is a partially enlarged cross-sectional view showing a connection between spring rows 3, 3 ′ of FIG. 1;
FIG. 5 is a partially enlarged sectional view showing a connection between spring rows 3, 3 'in another embodiment of the present invention.
[Explanation of symbols]
1,1 '... bag 2,2' ... Asagao coil spring 3,3 '... spring row 4 ... pocket spring seat 5 ... Frame border