Multipurpose & compatible pillow/headrest

Abstract

This invention with improvements in external figure and structure based on new and different concept for pillow and chairs is intended to create practical convenience in daily life and to minimize the neck and shoulder pain created from usage of uncomfortable pillows in bed and inconvenient chair during long-distance travel. In an aspect of external figure, the invention adopts the concept of ‘ergonomic shape hole of head-insert’ which they never tried so far. As for the structure, this invention provides insert space hole on the body of applicable objects which ‘pillow/headrest’ (it has an ‘ergonomic shape hole of head-insert’) combines with, for easy process of assembly and separation between body and pillow/headrest. Additionally it is designed to maximize the portability and to accommodate the multiple usage by unifying the shape and size of ‘pillow/headrest.’ This invention promotes the convenience and practicality for everyday use of the pillow and chair. Applicable objects are: 1) bed pillows for sleeping on and pillows for leaning 2) portable pillows in outdoor camping area 3) head cushions on existing reclining chairs 4) headrest on passenger seats of long distance transportations including airplane, ship, train, bus 5) headrest on office chairs and reclining chairs 6) headrest on drivers' seats and assistant drivers' seats of automobile during rest and sleeping after reclining backward 7) headrest function of back seats of the car 8) headrest on sofas In particular, they can reuse the existing chairs by simply remodeling the product; this will be a valuable attempt to benefit both in economic aspects (saving natural resources) and eventually to increase the convenience of customers.

1 - 15 . (canceled) 
     
     
         16 . A chair is presented, which can be equipped with a headrest made of foam material with a concavity, comprising the headrest including neck and head support areas;
 the concavity of the neck support area is a cylindrical surface which corresponds to the shape of the back of the user's neck;   the concavity of the head support area is a curved surface which corresponds to the shape of the back of the user's head;   of the arcs formed by the cross-section of the head support area perpendicular to the back and the symmetrical plane of the headrest, the arc in contact with the neck support area corresponds to the arc formed by the cross-section of the neck support area perpendicular to the back and the symmetrical plane of the headrest;   of the arcs formed by the cross section of the head support area perpendicular to the back and symmetrical plane of the headrest, the depth of the arc opposite the neck support area is greater than the depth of the arc formed by the cross section of the neck support area perpendicular to the back and the symmetrical plane of the headrest.   
     
     
         17 . For the chair in  claim 16 , wherein the head support area additionally includes an extended head support area opposite the neck support area;
 the concavity of the extended head support area is a cylindrical surface;   the depth of the arc formed by the cross-section of the extended head support area perpendicular to the back and symmetrical plane of the headrest is greater than the depth of the arc formed by the cross-section of the neck support area perpendicular to the back and symmetrical plane of the headrest;   of the arcs formed by the cross-section of the head support area perpendicular to the back and symmetrical plane of the headrest, the arc in contact with the extended head support area corresponds to the arc formed by the cross-section of the extended head support area perpendicular to the back and symmetrical plane of the headrest.   
     
     
         18 . For the chair in  claim 16 , a tray is placed between the headrest and chair. 
     
     
         19 . For the chair in  claim 18 , wherein the tray includes the back and sides;
 the tray back is in contact with the back of the headrest;   the corner edges of both sides and the bottom extend toward the front;   joint grooves for inserting the tray are formed on the cross-sections of the extended corner edges;   the sides of the tray are in contact with both sides and the bottom of the neck area of the headrest, and are inserted and fixed in the joint grooves.   
     
     
         20 . For the chair in  claim 19 , wherein the sides of the tray are equipped with a wing which is an outward extension of the outer edge opposite the joint groove. 
     
     
         21 . For the chair in  claim 16 , wherein an auxiliary frame is inserted between the headrest and the chair;
 the auxiliary frame does not surround a portion of the bottom of the neck area of the headrest.   
     
     
         22 . For the chair in  claim 21 , wherein a coupling rod is formed in an outward direction from the surface facing the bottom of the neck area of the headrest, in order to join the auxiliary frame with the chair;
 on the surface of the chair facing the coupling rod, a coupling hole for insertion of the coupling rod is formed;   a height adjustment structure is formed on the coupling rod and at the opening of the coupling hole.   
     
     
         23 . For the chair in  claim 16 , wherein the upper part of the back of the chair is detachable. 
     
     
         24 . A chair, wherein the back portion of the chair includes a detachable upper part and a main body where the detachable upper part is connected;
 the detachable upper part is made of foam, or foam and an outer cover;   the detachable upper part includes a neck support area with a neck support concavity and a head support area with a head support concavity;   the concavity of the neck support area is a cylindrical surface which corresponds to the shape of the back of the user's neck;   the concavity of the head support area is a curved surface which corresponds to the shape of the back of the user's neck;   of the arcs formed by the cross-section of the head support area perpendicular to the back and the symmetrical plane of the back of the chair, the arc in contact with the neck support area corresponds to the arc formed by the cross-section of the neck support area perpendicular to the back and the symmetrical plane of the back of the chair;   of the arcs formed by the cross-section of the head support area perpendicular to the back and the symmetrical plane of the back of the chair, the depth of the arc opposite the neck support area is greater than the depth of the arc formed by the cross-section of the neck support area perpendicular to the back and the symmetrical plane of the back of the chair.   
     
     
         25 . For the chair in  claim 24 , wherein the head support area additionally includes an extended head support area opposite the neck support area;
 the concavity of the extended head support area is a cylindrical surface;   the depth of the arc formed by the cross-section of the extended head support area perpendicular to the back and the symmetrical plane of the back of the chair is greater than the depth of the arc formed by the cross-section of the neck support area perpendicular to the back and the symmetrical plane of the back of the chair;   of the arcs formed by the cross-section of the head support area perpendicular to the back and the symmetrical plane of the back of the chair, the arc which is in contact with the extended head support area corresponds to the arc formed by the cross-section of the extended head support area perpendicular to the back and the symmetrical plane of the back of the chair.   
     
     
         26 . For the chair in  claim 16 , wherein the foam material is selected from a product group comprised of latex foam, memory foam, urethane foam, and sponge. 
     
     
         27 . For the chair in  claim 16 , wherein the arc formed by the cross-section of the neck support area perpendicular to the back and symmetrical plane of the headrest is 2 to 6 cm in depth;
 of the arcs formed by the cross-section of the head support area perpendicular to the back and symmetrical plane of the headrest, the arc opposite the neck support area is 5 to 9 cm in depth.   
     
     
         28 . For the chair in  claim 24 , wherein the arc formed by the cross-section of the neck support area perpendicular to the back and symmetrical plane of the detachable upper part is 2 to 6 cm in depth;
 of the arcs formed by the cross-section of the head support area perpendicular to the back and symmetrical plane of the detachable upper part, the arc opposite the neck support area is 5 to 9 cm in depth.