TW200412885A - Chair backrest - Google Patents

Abstract

Chair backrest comprising: a support structure (17), a lumbar support element (26) able to move relative to the support structure (17) along a vertical direction, and a control mechanism (32) able to be operated manually to adjust the position of said lumbar support element (26). The control mechanism (32) comprises: a telescopic lever (33) including a first section (35) articulated to the support structure (17) and a second section (36) able to slide in telescopic fashion relative to the first section (35), a control cursor (39) borne by said second section (36) of the telescopic lever (33), and a connecting member (42) borne by the telescopic lever (33) and engaging in sliding fashion the lumbar support element (26).

Description

200412885 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a chair backrest as described in the preface of the main patent application. [Prior art]

Currently known chair backs have a waist support element that can be moved relative to the base structure of the back, and combined with a control mechanism that allows a user to manually adjust the vertical position of the waist support element . An application number WO-A-02 / 3 2263 describes a chair backrest that includes at least a waist support element that can be moved vertically with respect to the support structure of the backrest and combined with an adjustment mechanism that is at least It includes two control rods that can be connected to the support structure of the backrest, and each has a tooth portion to mesh with each other. The two control levers are connected to the lumbar support element by respective connecting rod parts, and one of the two control levers has a control part that allows a user to manually grip, the control part protruding outside the backrest and along the The backrest ring moves. The control mechanism described in the application document WO-A-02 / 32262 is particularly suitable for a lower part of a backrest having a rounded edge. If the adjustment mechanism is used for a backrest with a straight edge, there will be some problems from an aesthetic point of view, because the control portion extending outside the backrest will protrude outward due to the difference in the degree of various adjustment positions. [Summary of the Invention] 3 200412885 The purpose of the present invention is to provide a chair back with an adjustable waist support element. The chair back has a simple control mechanism that can be used in a back with a straight edge without aesthetic defects. [Embodiment]

In the first and second figures, reference numeral 10 indicates a chair including at least a portion 11 and a backrest 12. In the conventional style, the chair 10 has a central support 13 with an adjustable height. On the top of the center support 1 3, a mechanism with a reference number 14 can be placed, which can cause the seat 11 and the backrest 12 to swing synchronously. The backrest 12 includes at least two pillars 15 made of metal or plastic, each having a connecting portion 16 to connect the backrest 12 to the swing mechanism 14 or the central support 13.

Referring to FIGS. 3 to 5, the backrest 12 includes at least a supporting structure 17 formed by a rigid flat plate (for example, made of a mold or injecting a plastic material). The support structure 17 has a front surface 18, a back surface 19, a lower edge 20, and two lateral edges 22. The support structure 17 is fixed to the upper end of the pillar 15 and is fixed to the back surface 19 of the support structure 17 by a pair of tubular elements 23 or to the support structure 17 by integral casting. The support structure 17 has a guide element extending in a vertical direction, and preferably has two pairs of slits 24 passing therethrough. The support structure 17 has an arched through groove 25. The backrest 17 has at least one lumbar support element 26 made of plastic material, which has a convex central portion 28 and two lateral portions 29 with pivot pins 4 200412885 3 0 (see FIG. 6). The pivot pin is slidably engaged with the through slit 24. The lumbar support member 26 can move freely with respect to the vertical direction of the support structure 17. The positions in the pivot pin 30 abutting the respective ends of the slits 24 constitute a position where the waist support member 26 is sufficiently lowered or raised. As shown in Fig. 3, the lumbar support member 26 has a horizontal groove 31, and its function will be apparent from the following description. Referring to FIGS. 4 to 8, the backrest 12 has a control mechanism 3 2 that can be manually operated to adjust the position of the lumbar support member 26 in the vertical direction. The control mechanism 32 has at least a retractable control lever 33 connected to the back surface 19 of the support structure 17. The connection point of the telescopic control lever 33 to the support structure 17 is indicated by numeral 34. The control lever 33 has at least a first part 35 and a second part%, each of which is preferably composed of a metal bar. The two parts 35, 36 can slide freely relative to each other, and are manually connected by the guide device 4. In the embodiment illustrated in the figures *, the two A 35, 36 are connected by a pivot joint and a slit pair. The first part 3 5 may have a pair of pivot pins 3 Ding Huayue * 37, for example, and slidably engage a linear slit formed in the second part 36. The second part 36 of the retractable control lever 33 can carry a control slider 9 for manual operation of the lamp-in. The ruler control object is connected to the first part 36 by a pivot pin 40, and is re-engaged in a sliding manner with the guide element ^ opening or # rivet which is integrally formed with a toilet support structure 17 Or screw 42 on the fixture. … This: ΓΓ33 cuts a connecting element 42 of the groove 31 of the waist… 70 pieces 26 which are slid in a sliding manner. The connecting element 42 200412885 may be composed of a pivot pin extending through the arched groove 25 and engaged with the groove 31 with an end protruding from the front surface 18 of the support structure 17. In the embodiment shown in the drawings, the connecting element 42 is integrally formed with the first portion 35 of the retractable control lever 33, which is formed by a backrest 4 extending laterally relative to the retractable control lever 33. 3 for link. The backrest 12 includes at least a filled 7L member 44 fixed to the front surface of the supporting structure I ?. As shown in Fig. 6, the lumbar support member 26 is movable in a space between the front face of the support structure 17 and the back face of the filling member 44. Referring to FIG. 6 again, the backrest i 2 has at least a rear closing sleeve 45 fixed to the support structure 7 to cover the rear side of the backrest and cover the control mechanism 42. The control slider 39 is protruded from the back 12 by the lower edge of the rear cover 45. The user can adjust the vertical position of the waist support member 26 by preventing the control slider 39 from sliding along the back edge 20 of the backrest 12. Referring to Figs. 4, 5 and 7, 8, the movement of the slider 39 can control the axial rotation of the retractable rod 33 in the joint 34. Due to the rotation of the retractable lever 33, the connecting element 42 can move along the arched groove 25. The connecting mechanism 42 leans against the wall of the groove 31 for movement, and the lumbar support member 26 can sequentially move vertically upward or downward. Figures 7 and 8 show the arrangement of the control mechanism 32 when the waist support element 26 is in the fully lowered position and fully raised, respectively. The lumbar support member 26 can be assumed to be located at an intermediate position between these positions in FIGS. 7 and 8. The lumbar support crotch member 26 is fixed to the position selected by the user by the frictional force generated by the filling member 44. 6 200412885 Of course, the backrest according to the present invention can also be variously polished without departing from the scope defined by the scope of patent application of the present invention described below. For example, the control slider 39 does not need to move along the lower edge 20, but instead moves along one of the lateral edges 22 of the backrest 12. [Brief description of the drawings] According to the present invention, the above object can be achieved by stating a backrest having these characteristics in the scope of the main patent application.

These features and the advantages of the present invention will be immediately understood through the detailed description below, which is illustrated only by non-limiting examples and with additional drawings, where: Figure 1 is based on the present invention. A schematic side view of a backrest chair. Figure 2 is a rear view of the chair in Figure 1. Figure 3 is a front perspective view of the backrest without the stuffing in Figure 1.

Figures 4 and 5 are perspective views of the rear part of the backrest, respectively, illustrating the control mechanism in two operating positions. Fig. 6 is a sectional view taken along line VI-VI in Fig. 5. Figures 7 and 8 are rear views of the control mechanism in the operating position shown in Figures 4 and 5. [Simplified description of the element representative symbols] 10 chairs 7 seat backrest center support mechanism pillar connecting part support structure front

Back Lower edge Transverse edge Tubular element Slit

Arched grooved waist support element Convex center section Lateral pivot pin Horizontal groove control mechanism Telescopic control lever connection point Part I Part II 200412885 37 Pole pin 38 Straight slit 39 Ruler control 40 Pole pin 41 Guide Leading element 42 Connecting element 43 Backrest 44 Filling element 45 Rear closure 9

Claims (1)

200412885 Scope of patent application: 1. A chair back including at least a support structure (17), a waist support element (26), which can be moved relative to the support structure (17) in a vertical direction, And a control mechanism (32), which can be manually operated to adjust the position of the lumbar support element (26), and is characterized in that the control mechanism (32) includes at least: a retractable control lever (33) including a connection To the first part (35) of the support structure (17) and a second part (36) which can slide in a telescopic manner relative to the first part (35), a control slide (39) , Which is supported by the second part (36) of the telescopic control lever (33), and a connecting element (42), which is supported by the telescopic control lever (33) and engages in a sliding manner To the waist support element (26). 2. The backrest according to item 1 of the scope of patent application, characterized in that the support structure (17) includes at least a rigid flat plate, which has a front face (18) and a back face (19), wherein the lumbar support element (26) ) Can be moved along the front side, and the retractable control lever (3 3) is connected to the back side. 3 · The backrest described in item 2 of the scope of patent application, characterized in that the connecting element (42) extends through a through opening of one of the supporting structures (1.7) 10 200412885 (25) 〇4. The backrest according to the item, characterized in that the connecting element (42) has a portion protruding from the front surface (18) of the supporting structure (17), and is slidably engaged with a groove of the waist supporting element (2 6) Slot (31). 5 · The backrest described in item 1 of the scope of patent application, characterized in that the control slider (39) is connected to the second part (36) of the retractable rod (32). The backrest according to the item, characterized in that the control spur (3 9) is slidably coupled to a guide element (41) fixed to the support structure (17). 7. The backrest described in item 1 of the scope of patent application, characterized in that the parts (35, 3 6) of the retractable control lever (32) are borrowed by a pair of pivot pins and slits (3 7, 3 8 ) Connected to each other. The backrest according to item 1 of the scope of patent application, characterized in that the lumbar support element (26) has a plurality of pivot pins (30), which slide in a mouth and extend perpendicularly to the support structure (17) Such slits. 8