Pillow

Abstract

A pillow whose height in the supine position and the side lying position of the user automatically and reliably changes depending on the position taken by the user. The pillow does not require adjustment and is stable. An urging device (4) provided in a cavity of a head placement member (2) of the pillow (1) has a link mechanism (6) and a tension spring (15). The link mechanism (6) includes a load support link (11) having a rear end slidably placed on the upper end of a rear link (9) and also having a front end pivotably connected to the front end of an upper link (10). The tension spring (15) urges the load support link (11) to push it upward. When a human head is not on the head placement member, in the product of the sine of the angle of forward inclination of each of front and rear links (8, 9) and the length of the link, the product for the front link (8) is two or more times greater than the product for the rear link (9) and, at the same time, the angle of forward inclination of the rear link is greater than 0 degree and not greater than 20 degrees. Further, the urging force of the tension spring (15) is set such that, when the front and rear links (8, 9) fall forward with the human head placed on the head placement member (2), the load support link (11) descends to the lowest descended position.

Description

technical field [0001] The present invention relates to a pillow used as bedding. More specifically, it relates to a pillow whose height is automatically changed when the user sleeps on his back and when he sleeps on his side. Background technique [0002] It is the most natural and ideal for people's sleeping position to fall directly from an upright state to a supine state. At this time, the position of the back of the head, which is at the lowest position of the head, is slightly higher than the back. Therefore, it is desirable to set the pillow used as bedding so that when a person sleeps on his back (hereinafter referred to as "sleeping on his back"), the position of the back of the head is slightly higher than the back. [0003] On the other hand, when people turn over during sleep and change to lying on their side (hereinafter referred to as " lying on their side "), since the head is supported by the shoulders, the head position is higher than when lying on the bac...

AI Technical Summary

Problems solved by technology

Therefore, the existence of such an adjustment is a difficult subject

Moreover, since the height of the pillow changes due to a slight change in the head load during sleep, the height of the pillow is not stable when the user lies on his side, and there is a problem of giving the user a soft feeling.

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