BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of a lumbar support (or seatback) according to the present invention;
FIG. 2 is a perspective view of the lumbar support (or seatback) of FIG. 1 according to the present invention;
FIG. 3 is a cross-sectional view of the lumbar support (or seatback) of FIG. 2 according to the present invention;
FIG. 4 illustrates an angle adjustment of the lumbar support (or seatback) according to the present invention;
FIG. 5 is a front view of the lumbar support (or seatback) according to the present invention;
FIG. 6 illustrates a height adjustment of the lumbar support (or seatback) according to the present invention;
FIG. 7 shows the lumbar support according to the present invention employed in a seatback of a chair;
FIG. 8 shows the seatback of a chair according to the present invention; and
FIG. 9 is an alternative embodiment of the lumbar support (or seatback) according to the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
A seat device for a chair according to the present invention, referring to FIGS. 1 and 2, comprises a lumbar support 8 or a seatback 8′. The lumbar support 8 or seatback 8′ is separated into a plate 1 and a pad 2 and comprises a base 3, fixed blocks 4, a movable block 5, an elastic member 54, outer covers 61 and 62, and a lifter 7.
A front surface of the plate 1 forms a ladder-type groove 11. Two grooves 12 are provided on a top edge of the front surface, each respectively adjacent either sides of the ladder-type groove 11, for positioning the sliders 13 with screws. Alternatively, the sliders 13 on the top edge of the front surface of the plate 1 are formed with the plate 1 integrally, as shown in FIG. 9, without providing the grooves 12. A lower portion of the plate 1 is formed as a shaft 14 having an external teeth portion 15 at one end with an internal hole 151 during plastic injection procedure. In a preferred embodiment, the lower portion of the plate 1 is formed as a hollow tube and embedded with a rod at one end.
The pad 2 is jointed with a board 21 on a rear surface. The board 21 is formed with a latch member 211 and sliding grooves 212 respectively corresponding to the ladder-type groove 11 and the sliders 13 of the plate 1. A pull bar 213 extends from a lower end of the board 21.
The base 3 has two pin lugs 31, each having an upper opening and provided on either side of the base. The base 3 is joined with a seat of a chair 9 or 9′.
Each of the fixed blocks 4 has a down opening and two opposite extension sections 41 extending there from. Moreover, the fixed blocks 4 and the pin lugs 31 of the base 3 respectively have through-holes for securing by screws in a corresponding direction.
The movable block 5 has a length smaller than those of the extension sections 41 of the fixed blocks 4. The movable block 5 is formed with two opposite slot 51 having a width with respect to a width of the extension section 41 on the periphery. Further, the movable block 5 has an internal teeth portion 52 and an inner hole 521 at one end matching with the external teeth portion 15, and an arc groove 53 on the other end opposing the internal teeth portion 52.
Each of the outer covers 61 and 62 has a rim and a slot 611 or 621 on the rim. The outer cover 61 has a groove hole 612 on an outer face and a pivot groove 613 adjacent to the groove hole 612.
Referring to FIGS. 1, 3, and 5, the assembly of the lumbar support 8 (or seatback 8′) according to the preferred embodiment of the present invention is shown. The shaft 14 is first positioned between the pin lugs 31 of the base 3 and the fixed blocks 4 are mounted on the shaft 14. The opposite extension sections 41 of one of the fixed blocks 4 is slid into the opposite slots 51 of the movable block 5 so as to combine the movable blocks 51 to the one of the fixed blocks 4. Further the elastic member 54 is positioned between the inner holes 151 and 521 of the external teeth portion 15 and internal teeth portion 52. The groove hole 612 and pivot groove 613 of the cover 61 are joined with the lifter 7 and a pivot bar 71. The outer covers 61 and 62 then are screwed to outsides of the two fixed blocks 4 for securing. The sliders 13 of the plate 1 are guided into the sliding grooves 212 of the board 21 of the pad 2 so that the latch member 211 of the board 21 is positioned in the ladder-type groove 11 of the plate 1.
To adjust angle of the seat device, referring to FIGS. 3 and 4, operation of angle adjustment of the lumbar support 8 (or seatback 8′) is illustrated. When the lifter 7 is pressed, the movable block 5 is forced outwards by the elastic member 54 for making the internal teeth portion 52 out of the external teeth portion 15, as shown in FIG. 4, the lumbar support 8 (or seatback 8′) thus is adjustable to any angle. Therefore, the lumbar support 8 (or seatback 8′) can completely contact with the human lumbar or back region for meeting an ergonomic design as well as obtaining the best comfort. When the lifter 7 returns to the original position, the movable block 5 is forced inwards by the lifter 7 and the internal teeth portion 52 engages with the external teeth portion 15 under a resistive force. As shown in FIG. 3, the lumbar support 8 (or seatback 8′) thus has a stable positioning mechanism.
To adjust height of the seat structure, referring to FIGS. 5 and 6, operation of height adjustment of the seat device is illustrated. When the pull bar 213 extending from the end of the board 21 is pulled, the latch member 211 of the board 21 is out of the ladder-type groove 11 of the plate 1. The board 21 with the pad 2 moves up-and-down by cooperation of the sliding grooves 212 with the sliders 13 of the plate 1. When the pull bar 213 is released, the latch member 211 is limited by the ladder-type groove 11 of the plate 1 for setting the lumbar support 8 (or seatback 8′) to a desired height under use as well as meeting an ergonomic design and obtaining a best comfort.
Referring to FIG. 7, the lumbar support 8 according to the present invention employed in a seatback 91 of the chair 9 is shown. The seatback 91 has an exposed space 911 at a default section so as to receive the lumbar support 8. When a user sits in the chair 9, the angle or height of the lumbar support 8 is adjustable by the user for completely contacting with the lumbar support 8 as well as meeting an ergonomic design and obtaining the best comfort.
Referring to FIG. 8, the seatback 8′ according to the present invention joined with a seat of the chair 9′ is shown. When the user sits on the chair 9′, the angle or height of the seatback 8′ is adjustable by the user for completely contacting with the seatback 8′ as well as meeting ergonomics and obtaining the best comfort.
It is appreciated that the above description are preferred embodiments of the present invention, and do not limit the present invention. Any changes made to the concept of the present invention without departing from the spirit and scope of the present invention and other variations, modifications, applications, and equivalents, such as altering the formation or arranging models should be covered by the claims of the present invention.
Patent Application
20080018154
