A CHAIR ADJUSTABLE TO OPTIMUM STANDARD HEIGHT

Abstract: A chair whose height can be adjusted to an optimum standard height in relation to the height of desk and the stature of user. The chair fixes and attaches the chair height lookup plate (11) which engraves the standard desk height indications (12), the stature scale of user (13) and the optimum standard height scale of chair (14) related with the user's stature on one side of supporting cylinder (5) and also attaches the scaled plate (15) which engraves the chair height scale (16) on one side of the circumferential surface of lifting strut (5).

Description: Title of Invention A chair adjustable to optimum standard height Technical Field This invention relates to a chair whose height can be adjusted to an 5 optimum standard height or level in relation to the height of desk and the stature of user. Background Art Generally, the height of desk is normalized to desks for chil dren, for students and for adults, and the height of chair is adjusted to an optimum level 10 in accordance with the stature of user, so that the user can sit on a chair to perform his study and work with a comfortable posture. However, the -existent chair is adapted to liftably insert a lifting strut or column fixed to the lower surface of seat plate into a supporting cylinder with a plurality of supporting legs attached, and to tighten up closely the tip of 15 setscrew engaged threadedly to a supporting cylinder, thereby fixing a seat plate to the desired height from the bottom surface. In the chair, the def ining of a chair height in relation to the height of desk and the stature of user is accomplished not by setting into a certain reference value, but by first adjusting the chair height at a rough guess of user ; and then deciding whether the user's 20 posture is comfortable or not when the user sits on a chair in front of a desk. Therefore, the existent chair has a drawback in that the adjusting of the chair height is very complicated because adjusting of the chair height into an optimum level is difficult by the adjust of one time and is possible by the trying of many- times. 25 Accordingly, it is an object of the present invention to provide a chair whose height can be adjusted to an optimum standard level conveniently in relation to the height of desk and the stature of user to remove the drawback as described previously. Disclosure of Invention This object of the present invention is accomplished by a chair which liftably inserts the lifting strut fixed to the lower surface of a seat plate into the supporting cylinder with a plurality of supporting legs attached and fix the same by a setscrew threaded to the supporting cylinder, characterized by fixing and attaching the chair height lookup plate which engraves the standard desk height indications, the stature scale of user and the optimum standard height scale of chair related with the user's stature on said one side of supporting cylinder ; and attaching the scaled plate which engraves the chair height scale on one side of the circumferential surface of said lifting strut. The indications of a standard desk height engraved to said chair height hookup plate are made in accordance with the use of desks, that is, desks for child ren, for stature scale is indicated by the range extending from the standard stature of children to that of adults while the optimum standard height scale of a chair is indicated by the optimum height scale related to the standard desk height and the user's stature. A user can read the o ' ptimum standard chair height for his stature in the chair height hookup plate ; and then release the setscrew and lift the lifting strut against the supporting cylinder in such manner that match a scale corres- ponding to said read height in the chair height scale with the upper surface of supporting cylinder, to set the height of seat plate into an optimum height ; and thereafter fix the lifting strut by tightening up the setscrew, thereby adjusting the chair height into an optimum level conveniently. Brief Description of Drawings This and other objects and features of the present invention will become clear from the following description of a preferred embodiment of the invention with reference to the accompanying drawings, wherein : Figure 1 is a front view of the chair adjustable to an optimum standard level, which is a preferred embodiment of the present invention. Figure 2 is a perspective view illustrating explodedly the main portion of the present invention. . - Figure 3 is the enlarged view of the chair height hookup plate. Figure is the enlarged view of the chair height scale. Best Mode for Carrying out the Invention Referring now to drawings, there is shown a chair 1 applying the prese invention, which inserts a lifting strut or column 5 fixed to the lower surface a seat plate into a supporting cylinder 2 with a plurality of supporting le attached, and tightens up a setscrew 7 with a handle : engaged threaded through a screw hole 6 defined in one side of the upper portion of supporti cylinder 2 to fix a lifting strut 5 with reference to the supporting cylinder In said one side of lifting strut 5 is longitudinally defined the long slot engaging the tip of said setscrew 7 closely. Further, in said supporting legs are rolling wheels 1 0 for contacting with the bottom surface. _ Moreover, between the supporting cylinder 2 and the lifting strut 5 conventionally inserted a liner made of synthetic resin, which is not sho because it has not a direct relationship with the object of this inventi In accordance wi th the present invention, a hookup plate I I indicating t chair height, which is engraved the indications of standard chair height 1 2, t stature scale of user 1 3 and the optimum height scale of chair 1 '-. related to t user's stature, is attached fixedly to one side of the circum ferential surface supporting cylinder 2. In said one side of the circumferential surface of lifting strut 5 is attach a scaled -plate 1 5 which engraves the chair height scale. Said chair height lookup plate is attached fixedly to the supporting cylin by a fixing rod 1 7, and the interior end of this fixing rod 1 7 is engaged to groove for anti-rotation 1 8 defined longitudinally in the lifting strut 5 throu the supporting cylinder 2, for preventing the lifting strut 5 from being rota with reference to the supporting cylinder 2. ' Said the scaled plate 1 5 of chair height is preferrable attached by defining the attached groove 1 9 in the lifting strut 5 not to project more largely than the circumferential surface of lifting strut 5, and may be carved on the surface of attached groove 1 9 directly rather than may attach the separately scaled plate 15, as illustrated in figure 4. The indications of standard chair height 12 engraved on said chair height lookup plate 1 1 is set to the standard height such as the order of 70cm , and the stature scale 13 is indicated by the range of 100 to 1 85cm, so that the chair may be used by all persons from children to adults. Further, the optimum standard height scale I Ψ is indicated to be viewed with the stature scale as the optimum standard height related to the user's stature when the standard desk height is used as the reference. The optimum standard chair height means the height covering from a pit of stomach to a navel when an user ists on a chair in front of a desk, which results in provi ding the user with the most comfortable posture. For example, in case that the chair height is in the order of 7Qcm, the optimum standard height becomes the order of 39.5cm for a person having the stature of 1 70cm while becomes the order of 37.5cm for a person having the stature of 1 80cm. This indication is provided by indicating the optimum standard height scale 1 for the stature of 1 00 to 1 85cm in relation to the stature scale 1 3. Said stature scale 1 3 of a hookup plate 1 1 and said optimum standard height scale 1 4 indicate the indications or marks as the reduced scale in relation to the size in the lookup plate I I , while the chair height scale 1 6 of a scaled plate 1 5 indicates the marks as the real scale. On the front surface of said supporting cylinder 2 may be attached a guide plate 20 which engraves the guide words as follows : "The stature scale on a lookup plate and the optimum standard height scale of this chair are to use the chair height of 70cm as their reference." and "In case that the chair height is higher or lower than 70cm, please adjust the chair height by adding or subtracting the difference of chair height to or from the optimum standard chair height on the lookup plate respectively". In using the chair in accordance with the present invention, a user first must read the optimum standard chair height with reference to his stature from the stature scale 13 of a chair height lookup plate 1 1 and the optimum standard height scale 14 ; and then release the setscrew 7 and lift the lifting strut 5 against the supporting cylinder 2, in such a manner that matches the scale corresponding to said read height value in the scale 16 of a chair height scale plate 5 with the upper surface of supporting cylinder 2, to adjust the height of seat plate 14 into the optimum height ; and thereafter tighten up the setscrew 7 and fix the lifting strut 5 into the supporting cylinder 2. For example, a child having the statute of 145cm must set the chair height scale 1 6 to 44.5cm, while an adult having that of 1 85cm must set the chair height scale to 36.5cm. An emb'odiment as shown in the drawings is to set the stature scale 1 3 and the optimum standard chair height 1 for the chair height of 70cm, and which may be used by setting the same to the height adding or subtracting the difference of chair height to or from the optimum standard chair height obtained in the lookup plate 1 1 if a chair having the height of more or less than 70cm is used. For example, if the chair height to be used is in the order of 72cm, a person having the stature of 1 70cm must adjust the chair height into 41 .5cm, which is a value adding the optimum standard height of 39.5cm obtained in the lookup plate ! 1 to the difference of 2cm. In the state adjusted this way, since a user can maintain the most comfortable posture when he sits on a chair in front of a desk, it is possible to alleviate the extent of fatigue in sitting to perform his study or work during long periods. While the preferred embodiment of the present invention has been described, it is to be understood that the invention is not limited thereto, but may be variously modified or changed without departing from the spirit and scope of the invention, and also can be applied to any type of chair whose height is adjus¬ table.

Claims: Claims 1. A chair adjustable to an optimum standard height, which liftably inserts the lifting strut (5) fixed to the lower surface of a seat plate (4) into the supporting cylinder (2) with a plurality of supporting legs (3) attached and fix the same by a setscrew (7) threaded to the supporting cylinder (2), characterized by fixing and attaching the chair height lookup plate (1 1) which engraves the standard desk height indications (12), the stature scale of user (13) and the optimum standard height sca of chair ( 14) related with the user's stature on one side of supporting cylinder (5) ; and attaching the scaled plate (1 ) which engraves the chair height scale ( 16) on one side of the circumferential surface of said lifting strut (5).

Inventors: PARK HYUNG SIK, PARK, HYUNG, SIK
Applicants: PARK HYUNG SIK, PARK, HYUNG, SIK
Application year: 1986
Main classification: A47C3
IPC codes: A47C3, A47C31