Seat cushions and nursing chairs

Abstract

This application discloses a seat cushion and a nursing chair. The seat cushion includes a seat surface and a through hole in the center of the seat surface, a support structure is installed under the through hole, the support structure and the seat surface form a storage space, and a collection box is removably stored in the storage space. A collection box that can be used in the nursing care field is attached to the bottom of the seat cushion, and the collection box and the seat cushion are removably connected, which is convenient for processing and cleaning.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese patent applications filed with the China Patent Office on August 24, 2021, with application number 202122010236.1, entitled "Deployable Chair", with application number 202122010085.X, entitled "High-speed insertion structure, chair and nursing chair having said structure", and with application number 202122004549.6, entitled "Lumbar pad for backrest and chair", all of which are incorporated herein by reference.

[0002] The present application relates to the technical field of living chairs and nursing chairs, and more particularly to seat cushions and nursing chairs. [Background technology]

[0003] Conventional technology has been stagnant in the nursing field, and the nursing chairs in the conventional technology 、 There is a lack of effective and stable support for the spine and upper body structures of those who need it, and in particular, there is no effective solution for waste collection receptacles for incontinent people. Summary of the Invention

[0004] In response to the deficiencies existing in the prior art, the present application presents a seat cushion and a nursing chair. In order to solve the above technical problems, the technical approaches adopted in the present application are as follows. In one aspect of the present invention, The seat and A through hole provided in the center of the seat; a support structure disposed below the through hole and forming an accommodation space together with the seat; and a collection box removably accommodated in the accommodation space.

[0005] In some embodiments of the present application, the collection box is provided as an upper cover structure and a lower box structure that are cut after primary blow molding, and the upper cover structure and the lower box structure are hook-connected.

[0006] In some embodiments of the present application, the top cover structure of the collection box, after being attached onto the seat surface, forms a continuous seat surface together with the seat surface, thereby ensuring comfort during use.

[0007] In some embodiments of the present application, protruding position limiting rails are installed on both sides of the storage space of the support structure, and correspondingly, concave grooves that match the protruding position limiting rails are opened at positions corresponding to the protruding position limiting rails on both sides of the collection box, and the collection box is guided and positioned in the storage space by the engagement of the concave grooves and the protruding position limiting rails.

[0008] In some embodiments of the present application, the lower box structure has breakwaters at both sides of the upper portion thereof that protrude toward the inside of the collection box.

[0009] Another aspect of the present application provides a nursing chair including any one of the seat cushions described above, and further including a backrest and / or armrests connected to the seat cushion.

[0010] In some embodiments of the present application, the backrest and / or armrest and the seat cushion are detachably connected by a connection structure, the connection structure includes a mounting hole structure installed on the seat cushion and a mounting structure installed on the backrest and the armrest, among which: The above mounting hole structure is an insertion hole formed on the seat cushion and extending toward the inside of the seat cushion; a step surface formed on a hole wall of the insertion hole, dividing the hole wall into a first hole wall and a second hole wall with the step surface as a boundary, the second hole wall being on the same side as the step surface and facing the first hole wall to enlarge the dimension of the insertion hole; the two position limiting fitting points are formed on both sides of the second hole wall, protrude relatively in a direction parallel to the step surface, and have a gap between them and the second hole wall; The above mounting structure is as follows: an insertion part that is installed on the backrest and the armrest and is insertable into the insertion hole; the eversion convexity extending obliquely outward along both sides of the bottom of the insertion portion to form a wing-shaped structure, wherein when the insertion portion is inserted into the insertion hole, the apex of the eversion convexity abuts the step surface and the side edge of the eversion convexity fits into the gap between the position limiting fitting point and the second hole wall to form an interference fit.

[0011] In some embodiments of the present application, the insert portion comprises: a columnar structure that is installed at a connection end on the backrest and the armrest, has a dimension that allows it to be inserted into the insertion hole, and extends in a direction away from the backrest and the armrest; The shovel-shaped structure extends obliquely from the bottom end of the columnar structure in a direction engaging with the step surface to form a shovel shape, and the valgus protrusions are installed on both sides of the shovel-shaped structure.

[0012] In some embodiments of the present application, the rear surface of the shovel-shaped structure is installed as an insertion guide slope extending obliquely from the lower edge of the columnar structure in a direction to engage with the step surface.

[0013] In some embodiments of the present application, the depth of the hole wall of the insertion hole on the opposite side of the step surface, i.e., the third hole wall, is equal to or less than the depth of the first hole wall, A horizontal position limiting protrusion is provided on the upper end of the insertion guide slope, and when the insertion part is inserted into the insertion hole, the position limiting protrusion is engaged and connected with the edge of the third hole wall.

[0014] The mounting structure is integrally formed with the seat cushion, and the mounting hole structure is integrally formed with the backrest or armrest.

[0015] In some embodiments of the present application, the nursing chair further includes a plurality of support legs, and the underside of the seat cushion is provided with mounting screw holes for attaching the support legs, and the mounting screw holes are connected to the support legs by screws.

[0016] In some embodiments of the present application, the mounting screw hole includes a screw fixing structure and a position limiting table.

[0017] In some embodiments of the present application, one end of the support leg has a screw head, one side of the base plane of the screw head is provided with a positioning structure, two locking protrusions are provided on the outer side of the position limiting table, there is a gap between the two locking protrusions, and the positioning structure can be locked into the gap to limit the position of the screw connection.

[0018] In some embodiments of the present application, the support legs are installed at different lengths, and when the length of the support legs is longer than a predetermined length, a through-hole structure is installed in the middle of the support legs to connect the two support legs.

[0019] In some embodiments of the present application, the support leg has an elastic non-slip foot pad that can be automatically flattened, the elastic non-slip foot pad is rotatably mounted on the bottom end of the support leg, and the elastic non-slip foot pad has a support surface that contacts the ground.

[0020] In some embodiments of the present application, the bottom of the seat cushion includes a first support member installed on both sides adjacent to the backrest mounting hole structure at the rear of the seat cushion, and a second support member and a third support member installed around the bottom of the seat cushion. The second support member and the third support member are installed symmetrically along the central axis of the seat cushion, and the first support member, the second support member and the third support member are formed as a protruding structure that is the highest part of the bottom of the seat cushion and are on the same plane, thereby forming a stable planar support for the seat cushion.

[0021] In some embodiments of the present application, the backrest is provided with a connection hole to which one or more inflatable or resilient lumbar pad members can be removably attached.

[0022] In some embodiments of the present application, the lumbar pad member comprises: A body having a force-receiving surface, a folded structure is provided on the body, and a width between the folded structures is adjusted according to the magnitude of the force received; A connecting member is provided on one side of the body, the connecting member having a hook structure on one end remote from the body, the hook structure being hooked and connected to a through hole provided on the backrest.

[0023] In some embodiments of the present application, the hook structure includes a support part connected to the main body and a fixed tail installed on the support part, the width of the fixed tail is wider than the width of the portion on the support part connected to the fixed part, thereby forming a locking portion, the width of the upper part of the connection hole on the backrest is wider than the width of the fixed tail, and the width of the lower part of the connection hole is narrower than the width of the fixed tail.

[0024] In some embodiments of the present application, a positioning portion is provided on the surface of the fixed tail facing the main body, the positioning portion being a protruding structure provided on the surface of the fixed tail, and a plurality of positioning grooves are provided vertically spaced apart on the side wall of the lower part of the connection hole, and the positioning grooves engage with the positioning portion to position and adjust the height of the waist pad member.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows: 1. The present application provides a special-function seat cushion, the bottom of which can be fitted with a collection box, which can be used in the field of nursing care; at the same time, the collection box and the seat cushion are detachably connected, which makes it convenient for disposal and cleaning. 2. The collection box provided in this application has an integrally molded structure, and the upper cover structure and lower box structure are formed by cutting. Therefore, when the collection box is not needed, the entire collection box can be covered with a lid to form a flat chair top. 3. The nursing chair provided in the present application has a chair that can collect excrement, and can be used for daily nursing of patients with limited mobility. 4. The nursing chair provided in the present application has a connecting structure that allows each component to be quickly detached by bare hands, so that the nursing chair can be expanded based on the needs of the usage situation, thereby improving the versatility and flexibility of the nursing chair. 5. The nursing chair provided in the present application is equipped with a compressible lumbar pad or an inflatable lumbar pad to improve the comfort of using the chair. [Brief description of the drawings]

[0026] [Figure 1] 1 is a schematic top view of a mounting hole structure provided in an embodiment of the present application; FIG. [Diagram 2] 1 is a schematic structural diagram of a bottom side of a mounting hole structure provided in an embodiment of the present application, viewed from below. [Diagram 3] 1 is a structural schematic diagram of a mounting structure provided in an embodiment of the present application. [Figure 4]2 is a structural schematic diagram 2 of the mounting structure provided in an embodiment of the present application. [Diagram 5] 2 is a schematic diagram of a structure in which a mounting hole structure and a mounting structure are inserted and connected together in an embodiment of the present application; [Figure 6] FIG. 2 is a three-dimensional view of a legless chair provided in an embodiment of the present application. [Figure 7] FIG. 2 is a side view of a legless chair provided in an embodiment of the present application. [Figure 8] FIG. 2 is a structural schematic diagram of a single-back chair provided in an embodiment of the present application. [Figure 9] FIG. 2 is a structural schematic diagram of a double back chair provided in an embodiment of the present application. [Figure 10] FIG. 2 is a schematic diagram of the structure of a semicircular chair provided in an embodiment of the present application. [Figure 11] 1 is a three-dimensional view of a nursing chair provided in an embodiment of the present application. [Figure 12] FIG. 2 is a rear view of a nursing chair provided in an embodiment of the present application. [Figure 13] FIG. 2 is a top view of a nursing chair provided in an embodiment of the present application. [Figure 14] FIG. 2 is a side view of a nursing chair provided in an embodiment of the present application. [Figure 15] FIG. 2 is a schematic diagram of another nursing chair provided in an embodiment of the present application. [Figure 16] FIG. 2 is a top view of a first seat cushion provided in an embodiment of the present application. [Figure 17] FIG. 2 is a bottom view of a first seat cushion provided in an embodiment of the present application. [Figure 18] FIG. 2 is a three-dimensional view of a first seat cushion provided in an embodiment of the present application. [Figure 19] FIG. 2 is a top view of a second seat cushion provided in an embodiment of the present application. [Figure 20] FIG. 2 is a bottom view of a second seat cushion provided in an embodiment of the present application. [Figure 21] FIG. 2 is a top view of a third seat cushion provided in an embodiment of the present application. [Figure 22] FIG. 2 is a bottom view of a third seat cushion provided in an embodiment of the present application. [Figure 23] FIG. 2 is a front view of a third seat cushion provided in an embodiment of the present application. [Figure 24] FIG. 13 is a rear view of a third seat cushion provided in an embodiment of the present application, with a collection box installed. [Diagram 25] FIG. 2 is a three-dimensional view of a collection box provided in an embodiment of the present application. [Figure 26] FIG. 2 is a front view of a backrest provided in an embodiment of the present application. [Figure 27] FIG. 2 is a side view of a backrest provided in an embodiment of the present application. [Figure 28] FIG. 2 is a front view of an armrest provided in an embodiment of the present application. [Figure 29] FIG. 2 is a side view of an armrest provided in an embodiment of the present application. [Diagram 30] FIG. 2 is a schematic diagram of a support leg provided in an embodiment of the present application. [Diagram 31] FIG. 2 is a three-dimensional view of an inflatable lumbar pad provided in an embodiment of the present application. [Diagram 32] FIG. 2 is a side view of an inflatable lumbar pad provided in an embodiment of the present application. [Diagram 33] FIG. 2 is a rear view of an inflatable lumbar pad provided in an embodiment of the present application. [Diagram 34] FIG. 2 is a top view of an inflatable lumbar pad provided in an embodiment of the present application. [Diagram 35] FIG. 2 is a three-dimensional view of a compression type lumbar pad provided in an embodiment of the present application. [Diagram 36] FIG. 2 is a front view of a compressible lumbar pad provided in an embodiment of the present application. [Figure 37] FIG. 2 is a side view of a compressible lumbar pad provided in an embodiment of the present application. [Figure 38] FIG. 2 is a rear view of a compressible lumbar pad provided in an embodiment of the present application. [Figure 39] FIG. 2 is a top view of a compressible lumbar pad provided in an embodiment of the present application. [Diagram 40] FIG. 2 is a three-dimensional view of a backrest provided in an embodiment of the present application and equipped with an inflatable lumbar pad; [Diagram 41] FIG. 2 is a rear view of a backrest provided in an embodiment of the present application with an inflatable lumbar pad installed thereon. [Diagram 42] FIG. 2 is a three-dimensional view of a backrest provided in an embodiment of the present application and equipped with a compressible lumbar pad. [Diagram 43] FIG. 2 is a rear view of a backrest provided in an embodiment of the present application and equipped with a compressible lumbar pad. [Diagram 44] FIG. 2 is a three-dimensional view of a backrest equipped with a combination of an inflatable lumbar pad and a compressible lumbar pad as provided in an embodiment of the present application. [Explanation of symbols]

[0027] 1 Body member; 101 first body member; 102 second body member; 11 bottom plane; 2 Mounting hole structure; 21 Insertion hole; 211 1st hole wall; 212 2nd hole wall; 22 Step surface; 213 3rd hole wall; 23 Position limited mating point; 3 mounting structure; 31 Insertion part; 311 Column structure 3111 Force-receiving plane; 312 Shovel-shaped structure; 3121 Insertion guide bevel; 3122 Position limited convexity; 32 Valgus convexity; 4 seat cushions; 41 first focal support member; 42 second focal support member; 43 Third focal support member; 44 Support leg fixed structure; 441 mounting screw holes; 4411 Screw-fixed structure; 4412 Position-limited table; 4413 Locking protrusion; 45 Drainage hole; 401 1st seat cushion; 4011 Convex structure; 402 2nd seat cushion; 403 3rd seat cushion; 4031 seat; 4032 through hole; 4033 Support structure; 4034 Containment space; 4035 raised position limiting rail; 5 backrest; 51 connection hole; 511 Top of connecting hole; 512 Lower part of connecting hole; 52 positioning groove; 6 armrests; 7 supporting legs; 71 1st support leg 72 Second support leg 73 Third support leg; 74 4th support leg; 701 Through-hole structure; 702 Elastic anti-slip leg pads; 7021 Support plane; 703 screw head; 704 Positioning structure; 8 collection boxes; 81 Upper lid structure; 82 Lower box structure; 83 groove; 84 1st handle; 85 second handle; 86 Wavebreak tank; 9 Waist pad member; 91 Body; 911 Receptive surface; 912 folded structure; 9121 First annular groove loop structure; 9122 Second annular groove loop structure; 92 connecting members; 93 Hook structure; 931 Support part; 932 fixed tail; 933 Positioning section; 94 Intake nozzle; 901 Inflatable waist pad; 902 Compression lumbar pad. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] The following provides a detailed and complete description of the technical solutions in the specific embodiments of the present application in conjunction with the drawings. Of course, the described embodiments are only a part of the specific embodiments of the overall technical solution of the present application, and are not all embodiments. Based on the overall concept of the present application, all other embodiments obtained by those skilled in the art are within the scope of protection of the present application.

[0029] In describing the present application, it should be understood that the orientations or positional relationships indicated by the terms "center," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate and simplify the description of the present application, and do not indicate or imply that the devices or elements referred to necessarily have a specific orientation or are constructed and operated in a specific orientation, and should not be understood as limitations on the present application.

[0030] It will be understood that in the description of this application, the "upper surface" of the seat cushion refers to the seating surface on which a user sits, and the "lower surface" of the seat cushion refers to the other surface opposite to the "upper surface".

[0031] The terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply a relative importance or number of the technical features being referred to. Thus, features qualified as "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of such features.

[0032] It should be explained in the description of this application that, unless otherwise clearly specified and limited, the terms "attached", "coupled" and "connected" should be understood in a broad sense. For example, they may be fixedly connected, detachably connected, or integrally connected. They may also be directly connected, indirectly connected through an intermediate medium, or internally communicated between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0033] The present application will be further explained below in conjunction with drawings and examples. Example 1 In a first embodiment of the present application, a connection structure is provided that can be used for detachably connecting two body members to be connected, the connection structure comprising: It includes a mounting hole structure 2 and a mounting structure 3 that are installed correspondingly on two main body members 1 to be connected.

[0034] As shown in FIG. 1 and FIG. 2, the mounting hole structure 2 is as follows: An insertion hole 21 is provided in one of the main body members 1, i.e., the first main body member 101, and extends toward the inside of the first main body member 101, and can penetrate the first main body member 101; a step surface 22 formed on the hole wall of the insertion hole 21 and dividing the hole wall into a first hole wall 211 and a second hole wall 212 with the step surface 22 as a boundary, the second hole wall 212 being on the same side as the step surface 22 and enlarging the dimension of the insertion hole 21 relative to the first hole wall 211; The second hole wall 212 includes two position-limiting fitting points 23 formed on both sides thereof, protruding relatively in a direction parallel to the step surface 22, and having a gap formed between the second hole wall 212 and the two position-limiting fitting points 23.

[0035] As shown in FIGS. 3 to 5, the mounting structure 3 includes: an insertion portion 31 that is installed on another main body member 1, i.e., a second main body member 102, and that can be inserted into the insertion hole 21; The eversion protrusions 32 extend obliquely outward along both sides of the bottom of the insertion portion 31 to form a wing-shaped structure, and when the insertion portion 31 is inserted into the insertion hole 21, the top end of the eversion protrusion 32 abuts against the step surface 22 and the side edge of the eversion protrusion 32 fits into the gap between the position-defining fitting point 23 and the second hole wall 212 to form an interference fit.

[0036] This embodiment provides a simple connection structure, and by installing the mounting hole structure 2 and the mounting structure 3 on the two main body members 1 to be connected, when it is necessary to connect the two main body members 1, simply inserting the insertion portion 31 of the mounting structure 3 into the insertion hole 21 of the mounting hole structure 2, the eversion protrusion 32 is engaged between the step surface 22 and the position limiting fitting point 23, thereby realizing stable connection and speedy attachment / detachment of the two main body members 1. Since the structures of the first main body member 101 and the second main body member 102 are not limited, it will be understood that only a portion of the first main body member 101 and the second main body member 102 are shown in Figures 1 to 5.

[0037] Furthermore, as shown in FIG. 3 and FIG. 4, the insertion portion 31 is a columnar structure 311 that is installed at the intended connection end of the second body member 102, has a dimension that allows it to be inserted into the insertion hole 21, and extends in a direction away from the second body member 102, and generally has a width that is slightly smaller than the width between the first hole wall 211 and the opposite hole wall, so that the columnar structure 311 can be smoothly inserted into the insertion hole 21; The shovel-shaped structure 312 extends obliquely from the bottom end of the columnar structure 311 in a direction engaging with the step surface 22 to form a shovel shape, and the valgus protrusions 32 are installed on both sides of the shovel-shaped structure 312.

[0038] When the mounting structure 3 is inserted into the mounting hole structure 2, the shovel-shaped structure 312 is located in the second hole wall 212 portion of the insertion hole 21, the top end of the eversion protrusion 32 contacts and engages with the step surface 22, and the side edge of the eversion protrusion 32 engages with the position-limiting mating point 23, thereby achieving speedy connection and removal between the two main body members 1 to be connected.

[0039] The rear surface of the shovel-shaped structure 312, i.e., the surface which moves away from the step surface 22 after insertion, is installed as an insertion guide slope 3121 which extends obliquely from the lower edge of the columnar structure 311 in the direction of engaging with the step surface 22, and the insertion guide slope 3121 and the force-receiving plane 3111 of the mounting structure to which the front side of the shovel-shaped structure is connected form a wedge-shaped action.

[0040] It can be understood that the eversion convexities 32 installed on both sides of the shovel-shaped structure 312 need to abut and engage with the step surface 22, and therefore the eversion convexities 32 necessarily protrude in the width direction relative to the columnar structure 311, so that if the insertion part 31 is inserted vertically into the insertion hole 21, it cannot be inserted smoothly, so that the insertion guide slope 3121 is installed to guide the insertion part 31 to be inserted obliquely into the insertion hole 21 along the insertion guide slope 3121, thereby smoothly guiding the shovel-shaped structure 312 and the eversion convexity 32 to be inserted into the insertion hole 21. When the second body member 102 is subjected to an outward thrust, the columnar structure 311 is guided by the insertion guide slope 3121 to naturally descend, and pushes the side edges of the eversion convexities 32 on both sides of the shovel-shaped structure 312 past the position limiting fitting points 23 to form an interference fit.

[0041] Furthermore, as shown in FIG. 2, the depth of the hole wall of the insertion hole 21 on the opposite side of the step surface 22, i.e., the third hole wall 213, is equal to or less than the depth of the first hole wall 211, As shown in FIG. 4 , a horizontal position-limiting protrusion 3122 is provided on the upper end of the insertion guide slope 3121. When the insertion portion 31 is inserted into the insertion hole 21, the position-limiting protrusion 3122 engages with the edge of the third hole wall 213, thereby providing an additional position-limiting effect for the mounting structure 3.

[0042] Optionally, the mounting structure 3 and the mounting hole structure 2 are both integrally molded with the correspondingly connected main body member 1. That is, the mounting hole structure 2 and the first main body member 101 are integrally molded structures, and the mounting structure 2 and the second main body member 102 are integrally molded structures. Specifically, the insertion hole 21 of the mounting hole structure 2 can be set as a rectangular hole, and correspondingly, the column structure 311 of the mounting structure 3 can be set as a rectangular column structure.

[0043] Example 2 Based on the connection structure provided in Example 1, as shown in Figures 6 to 15, this example provides an unfoldable chair, which includes multiple connection structures described in Example 1, a seat cushion 4 (see Figures 16 to 23), and a backrest 5 (see Figures 26 and 27), and the backrest 5 is removably connected to the seat cushion 4 by the above-mentioned connection structures.

[0044] Furthermore, the chair includes an armrest 6 (see Figs. 28 and 29), said armrest 6 being detachably connected to the seat cushion 4 by the connection structure described in the first embodiment.

[0045] Furthermore, the chair includes a number of support legs 7 (see FIG. 30). Specifically, the deployable chair provided in this embodiment includes: A seat cushion 4 having a plurality of mounting hole structures 2 provided on its surface; At least one backrest 5 removably connected to a backrest mounting structure 3 installed at a lower portion thereof and a mounting hole structure 2 on a seat cushion 4, in which when an outward force is applied to the backrest 5, the mounting hole structure 2 engages with the backrest mounting structure 3, and when an inward force is applied to the backrest 5, the mounting hole structure 2 and the backrest mounting structure 3 are disengaged, thereby realizing a speedy connection and removal between the backrest 5 and the seat cushion 4; and and at least one armrest 6 removably connected by an armrest mounting structure 3 installed below it and a mounting hole structure 2 on a seat cushion 4, wherein when an outward force is applied to the armrest 6, the mounting hole structure 2 engages with the armrest mounting structure 3, and when an inward force is applied to the armrest 6, the mounting hole structure 2 and the armrest mounting structure 3 disengage, thereby realizing speedy connection and removal between the armrest 6 and the seat cushion 4.

[0046] It can be understood that the mounting hole structure 2 on the surface of the seat cushion 4 is provided in correspondence with the position where the backrest 5 or armrest 6 needs to be attached, and is generally provided on the outer periphery of the surface of the seat cushion 4. The application of the above "outwardly" or "inwardly" force is described with respect to a user sitting on the chair.

[0047] The above chair realizes the quick attachment and detachment of the seat cushion 4 and other components, such as the backrest 5, armrests 6, etc., through the engagement of the mounting hole structure 2 and the mounting structure 3, and allows the chair to be deformed and developed in structure according to the needs and preferences of the user, making it more flexible and more suitable for use by different people. Optionally, the backrest 5 and armrests 6 of this embodiment are formed in one step by a blow molding process.

[0048] The specific configurations of the mounting hole structure 2 and the mounting structure 3 used in the chair provided in this embodiment are similar to those in the first embodiment, and therefore will not be described repeatedly here.

[0049] The inter-engagement process between the mounting structure 3 at the bottom of the backrest 5 or armrest 6 and the mounting hole structure 2 on the surface of the seat cushion 4 is as follows: When the armrest 6 or the backrest 5 is thrust toward the outside of the seat cushion 4 in its use state, the insertion part 31 is guided by the insertion guide slope 3121 and naturally descends, and pushes the side edges of the outward protrusions 32 on both sides of the shovel-shaped structure 312 past the position-defining fitting point 23 in the insertion hole 21 to form a tight fit. At the same time, the lateral position-defining protrusions 3122 of the insertion guide slope 3121 also form a position-defining lock with the edge of the third hole wall 213 of the insertion hole 21 that comes into contact with it, forming a state in which it is difficult to come off. At the same time, the force-receiving plane 3111 of the columnar structure 311 and the bottom plane 11 of the armrest 6 or backrest 5 are engaged with the hole wall of the insertion hole 21 of the seat cushion 4 and the contact surface around the insertion hole 21 on the top surface of the seat cushion 4, respectively, to receive the force and form a stable support structure. When a thrust is applied to the armrest 6 or backrest 5 in the opposite direction, i.e., toward the inside of the seat cushion 4, the eversion protrusions 32 on both sides of the shovel-shaped structure 312 naturally disengage from the position-limiting fitting points 23 in the insertion hole 21, forming a state in which they can be pulled out by applying a force upward.

[0050] 17, the bottom of the seat cushion 4 has a first focus support member 41 adjacent to both sides of the backrest mounting hole structure 2 at the rear of the seat cushion 4, and a second focus support member 42 and a third focus support member 43 respectively installed around the periphery of the bottom of the seat cushion 4, the second focus support member 42 and the third focus support member 43 being installed symmetrically along the central axis of the seat cushion 4, and the first focus support member 41, the second focus support member 42 and the third focus support member 43 being formed as a protruding structure which is the highest part of the bottom of the seat cushion 4 and being on the same plane, thereby forming a stable planar support for the seat cushion 4. With the above structure, a legless chair style can be realized.

[0051] Furthermore, the chair may include a plurality of support legs 7, and a support leg fixing structure 44 for attaching the support legs 7 is provided at the bottom of the seat cushion 4, so that the support legs 7 can be attached to the bottom of the seat cushion 4 according to needs.

[0052] It is understood that the structure of the support leg fixing structure 44 does not affect the functions of the first, second and third focus support members 41, 42, 43. That is, since the height of the focus support members is higher than the support leg fixing structure, the member in contact with the ground always becomes the focus support member.

[0053] 17, 20 and 22, the support leg fixing structure 44 includes a mounting screw hole 441 provided on the underside of the seat cushion 4, and the mounting screw hole 441 is connected to the support leg 7 by a screw. The mounting screw hole 441 includes a screw fixing structure 4411 and a position limiting table 4412. The screw fixing structure 4411 is a screw structure provided on the inner surface of the mounting screw hole 441, and the position limiting table 4412 is a protruding flat surface provided around the mounting screw hole 441 on the underside of the seat cushion 4, and is used to limit the position of the screw-in depth of the support leg 7.

[0054] One end of the support leg 7 has a screw head 703 which can be engaged with a screw fixing structure 4411 of the seat cushion 4 for attachment.

[0055] 30, there is a positioning structure 704 on one side of the base plane of the screw head 703, and two locking protrusions 4413 are provided on the outer side of the position limiting table 4412, and there is a gap between the two locking protrusions 4413, and the positioning structure 704 can be locked in the gap to limit the position of the screw connection. When the support leg 7 is installed, the screw head 703 of the support leg 7 is screwed into the screw fixing structure 4411 until the base plane of the screw head 703 contacts the position limiting table 4412, and the positioning structure 704 is continuously screwed inwardly so as to engage in the gap between the two locking protrusions 4413 to form a physical position limit, thereby ensuring that the screw connection of the support leg 7 will not loosen even if the chair rotates or moves.

[0056] In a preferred technical manner, the support legs 7 are set to different lengths, and the support legs 7 of different lengths have the same dimension of screw heads 703, which improves the versatility of the screw connection structure, and the chair can be replaced with support legs 7 of different heights according to demand, thereby realizing the conversion to chairs of various heights.

[0057] Furthermore, when the length of the support leg 7 is longer than a predetermined length, a through-hole structure 701 is provided in the middle of the support leg 7. When the support leg 7 is attached to the chair, the through-hole structure 701 can be used to realize the connection between the support legs, which effectively prevents the support legs from opening outward when the user's weight is relatively heavy, thereby improving the stability of the chair. Specifically, there are multiple connection methods, such as connecting adjacent support legs 701 or connecting two diagonally opposite support legs 701.

[0058] In addition, the support leg 7 is equipped with an automatically flat elastic anti-slip leg pad 702. The elastic anti-slip leg pad 702 is rotatably mounted on the bottom end of the support leg 7, and has a support plane 7021 that contacts the ground, and the elastic anti-slip leg pad 702 automatically rotates to a corresponding position when the support plane 7021 contacts the ground during the use of the chair, thereby realizing the function of automatically flattening.

[0059] As shown in Fig. 30, specifically, the support leg 7 includes a first support leg 71, a second support leg 72, a third support leg 73, and a fourth support leg 74 of different lengths. The other ends of the first support leg 71, the second support leg 72, the third support leg 73, and the fourth support leg 74 have elastic anti-slip leg pads 702 that can finely adjust the angle. The middle parts of the third support leg 73 and the fourth support leg 74 have an integrally molded through-hole structure 701, and since the support legs 73 and 74 are high, the connection and fixation of two adjacent support legs 73 and 74 can be realized through the through-hole structure 701 by using other means.

[0060] In the above embodiment, the support leg fixing structure 44 at the bottom of the seat cushion 4 allows the chair to be freely changed between legs and chairs with legs, allows the support legs 7 of different heights to be selectively attached and detached, and ensures the stability and load safety that the chair should have in any state. At the same time, by engaging with the mounting hole structure 2 of the seat cushion 4, the backrest 5 and armrests 6 can be selectively attached to achieve different combinations of the seat cushion 4 with other components, realizing selective, simple one-step attachment and detachment of each component and stable and reliable connection.

[0061] It should be noted that the seat cushion 4 in the chair is integrally formed by blow molding, and may be used alone or with support legs 7 attached to the bottom, or may be attached to a backrest 5 and armrests 6 to form a single backrest, double backrest, or quadruple backrest annular structure. Among them, the support legs 7 can be attached at different heights, and the above structure can meet the needs of outdoor, nursing, daily life, tents, camping, ondol, tatami, floor, etc.

[0062] Preferably, the seat cushion 4, the backrest 5, the armrests 6 and the support legs 7 are all provided as one-piece hollow structures formed by blow molding.

[0063] It should be noted that the chair is hollow blow molded, and the integral molding includes the seat cushion 4, the armrests 6 around it, the mounting hole structure 2 for mounting the backrest 5, and the support leg fixing structure 44 for mounting the support legs 7 on the bottom surface.

[0064] Specifically, various deployment forms of the deployable chair will be described below in conjunction with two different structural forms of the seat cushion 4.

[0065] 16 to 18 show a first seat cushion 401, and a protruding structure 4011 is provided on the rear side of the upper surface of the first seat cushion 401, and the protruding structure 4011 engages with and is attached to the backrest 5, thereby further increasing the usable height of the backrest. Landing support members 41, 42, and 43 are provided on the bottom of the seat cushion 4, and the lower surfaces of the landing support members 41, 42, and 43 are lower than the outermost lower surfaces of the mounting screw holes 441.

[0066] According to the structure of the first seat cushion 401, Figures 6 and 7 are respectively a three-dimensional view and a side view of the legless chair presented in this embodiment. The legless chair includes a backrest 5 and armrests 6 mounted on the first seat cushion 401, and the legless chair utilizes a first focusing support member 41 to prevent the chair from falling over due to leaning on the backrest 5 when the entire chair is used on the floor or bed surface.

[0067] As shown in FIG. 8, by attaching support legs of different lengths to the lower part of the legless chair, seats or chairs of different heights can be formed for different uses.

[0068] 19 and 20 are bottom and top views of the second seat cushion 402 presented in this embodiment, in which there are two mounting hole structures 2 at the rear of the second seat cushion 402, and mounting hole structures 2 are also installed on both sides of the second seat cushion 402.

[0069] As shown in Fig. 9, the second seat cushion 402 can be provided with a backrest 5 attached to the two rear mounting hole structures 2 and armrests 6 attached to the mounting hole structures 2 on both sides to form a double back chair. Optionally, the armrests 6 can be replaced with the backrest 5 to form a semicircular chair, as shown in Fig. 10. For the double back chair and the semicircular chair, it is also possible to choose whether or not to attach the support legs 7.

[0070] The double backrest combination design of the above-mentioned second seat cushion 402 can better provide support for the lower back and both sides of the lower back, and at the same time, the two armrests can be replaced with backrests to form a semicircular chair, and the combination of four backrests can achieve a more stable upper body support effect. The first seat cushion 401 and the second seat cushion 402 are provided with drainage through-holes 45 that penetrate from the front to the back.

[0071] Example 3 21 to 24 are a perspective view, a bottom view, and a rear view of the third seat cushion 403 provided in the embodiment of the present application. The third seat cushion 403 is Seat 4031 and A through hole 4032 opened in the middle of the seat 4031, optionally having a dimension along the longitudinal direction of the seat 4031 larger than a dimension along the width direction of the seat 4031; a support structure 4033 disposed below the through hole 4032 and forming an accommodating space 4034 together with the seat 4031, the support structure 4033 being optionally integrally formed with the seat 4031; and a collection box 8 that is removably accommodated within the accommodation space 4034.

[0072] 25, the collection box 8 includes an upper cover structure 81 and a lower box structure 82 having a collection chamber, and the upper cover structure 81 and the lower box structure 82 are hook-connected. Specifically, the collection box 8 is formed by cutting after the primary blow molding. Preferably, when the collection box 8 is placed in the receiving space 4034, the upper cover structure 81 and the seat surface 4031 of the third seat cushion 403 are flush with each other, ensuring comfort during use.

[0073] In practical application, a storage space 4034 that is recessed downward and open at both ends is formed on the central axis of the third seat cushion 403, and a suitable collection box 8 can be fixed and attached to the storage space 4034, and the upper edge of the storage space 4034 that contacts the third seat cushion 403 is designed as a side leakage prevention structure that extends at an angle toward the inside of the storage space 4034, and the side leakage prevention structure can be engaged with and attached to the top cover structure 81 of the collection box 8. After the top cover structure 81 of the collection box 8 is attached to the third seat cushion 403, it forms a continuous seat surface together with the seat surface 4031 of the third seat cushion 403, ensuring comfort during use.

[0074] Furthermore, protruding position limiting rails 4035 are installed on both sides inside the storage space 4034 of the support structure 4033, and correspondingly, concave grooves 83 that match the protruding position limiting rails 4035 are opened on both sides of the collection box 8 at positions corresponding to the protruding position limiting rails 4035, and the collection box 8 is guided and positioned within the storage space 4034 by engagement between the concave grooves 83 and the protruding position limiting rails 4035.

[0075] Furthermore, a first handle 84 is provided at one end of the lower box structure 82. Specifically, the collection box 8 is integrally molded and has an integrally molded first handle 84 and an integrally molded top cover structure 81, and the top cover structure 81 may be attached to the lower box structure 82 after being separated from the lower box structure 82 of the collection box 8 by means of cutting, or may be attached to the top of the through hole 4032 of the third seat cushion 403 to form a unified seat surface together with the upper surface of the seat surface 4031.

[0076] Additionally, the top of the top cover structure 81 has a second molded handle 85 to facilitate opening and closing the top cover structure 81.

[0077] Optionally, as shown in Figures 24 and 25, the lower box structure 82 has a breakwater 86 at the upper part on both sides thereof, which protrudes toward the inside of the collection box 8 (the outside is shown as being concave). The purpose of this is to prevent the breakwater 86 from blocking or impeding the swaying of the liquid surface during transportation when there is liquid in the collection box 8, thereby preventing the liquid from splashing out.

[0078] The third seat cushion 403 provided in this embodiment and equipped with a collection box 8 can be used in various nursing chairs. Similarly, a plurality of mounting hole structures 2 can be installed on the surface of the third seat cushion 403, and various chairs of different styles can be formed by removably connecting each member of the chair via the connecting structure described in Example 1 based on the method of Example 2. For the specific structure of the connecting structure and the connecting method of each member, please refer to Examples 1 and 2, and they will not be described again here.

[0079] 11 to 14 are schematic diagrams of the assembled third seat cushion 403 in the embodiment of the present application, which are schematic diagrams of the assembled third seat cushion 403 combined with two armrests 6, two backrests 5, four support legs 7, a collection box 8, and a collection box top cover structure 81. Optionally, the two armrests 6 can be replaced with the backrest 5 to form a semicircular chair, as shown in FIG.

[0080] Example 4 As shown in Figures 40 to 44, this embodiment provides a backrest having a lumbar pad member. As shown in Figure 26, a connection hole 51 for installing the lumbar pad member 9 is opened in the vertical direction on the backrest 5. As shown in Figures 31 to 39, the lumbar pad member 9 is A main body 91 having a force receiving surface 911 on which a user leans, the main body 91 being provided with a folding structure 912, and the position of the force receiving surface 911 in the force receiving direction being changed by changing the width of the folding structure 912; The seat backrest 5 further includes a connecting member 92 that is installed on one side of the main body 91 and has a hook structure 93 at one end thereof that is remote from the main body, the connecting member 92 being hooked and connected to a connecting hole 51 of the backrest 5 by the hook structure 93.

[0081] Furthermore, the hook structure 93 includes a support part 931 connected to the body 91 and a fixed tail 932 installed on the support part 931, and the width of the fixed tail 932 is wider than the width of the part on the support part 931 where the fixed tail 932 is connected, thereby forming a locking part. On the surfaces of the fixed tail 932, the support part 931 and the body 91 on the same side as the hook structure 93, a "U"-shaped hook structure that engages with the connection hole 51 of the backrest 5 is formed.

[0082] Furthermore, a positioning portion 933 is provided on the surface of the fixed tail 932 facing the main body 91 , and the positioning portion 933 is a protruding structure provided on the surface of the fixed tail 932 . Furthermore, the main body 91 and the connecting member 92 are a hollow structure integrally molded by blow molding, and an air intake nozzle 94 is installed on the connecting member 92. The width of the folded structure 912 can be adjusted by letting air in and out of the main body through the air intake nozzle 94.

[0083] Furthermore, the periphery of the main body 91 is arc-shaped, and the surface of the main body 91 remote from the connecting member 92 is set as a plane having a degree of arc. Specifically, the width of the upper part 511 of the connection hole 51 of the backrest 5 is wider than the width of the fixed tail 932, and the width of the lower part 512 is narrower than the width of the fixed tail 932, so that the fixed tail 932 of the hook structure 93 can smoothly pass through the connection hole 51 from the upper part 511 of the connection hole 501, move to the connection hole lower part 512, and engage at the corresponding position.

[0084] Furthermore, a plurality of positioning grooves 52 are provided at intervals in the vertical direction on the side walls of the lower connection hole 512, and the positioning grooves 52 engage with the positioning portions 933 of the fixing tail 932 to position and adjust the height of the waist pad member 9. It can be seen that the positioning portions 933 are provided symmetrically on both sides, and thus engage with the positioning grooves 52 on both side walls, respectively.

[0085] In one embodiment, as shown in Figs. 31 to 34, the lumbar pad member 9 is an inflatable lumbar pad 901, and the specific structure of the inflatable lumbar pad 901 will be described below.

[0086] The folding structure 912 of the inflatable lumbar pad 901 includes a first annular groove loop structure 9121 and a second annular groove loop structure 9122 installed on the force receiving surface 911. When air is pumped into the inside of the inflatable lumbar pad 901, the first annular groove loop structure 9121 and the second annular groove loop structure 9122 inflate and expand, causing the inflatable lumbar pad 901 to inflate only on the forward direction (opposite to the direction of receiving force) to form a support structure. The folding structure is formed when the annular groove loop structure is supplied with air by the intake nozzle 62 and inflates only on one side. By adjusting the amount of intake air, the width between the folding structures 912 is changed to adjust the elasticity.

[0087] The hook structure 93 includes a support 931 installed on the top of the main body 91 and a fixed tail 932 installed on the support 931, and the width of the fixed tail 932 is wider than the width of the portion on the support 931 where the fixed tail 932 is connected.

[0088] Specifically, the support portion 931 extends diagonally upward from the top of the main body 91 in a direction away from the force-receiving surface 911, the plane on which the fixed tail 932 is located is approximately parallel to the force-receiving surface 911, a protruding positioning portion 933 is provided on the surface of the fixed tail 932 facing the main body 91, and an ``U''-shaped hook structure is formed on the surfaces of the fixed tail 932, the support portion 931, and the main body 91 on the same side as the hook structure 93.

[0089] In addition, an air intake nozzle 94 is installed at the top end of the fixed tail 932, and the width of the folded structure 912 can be adjusted by injecting air into and out of the body 91 through the air intake nozzle 94. The thickness of the inflatable lumbar pad member can be changed by injecting air with a manual air pump or an electric air pump, thereby changing the support condition.

[0090] 35 to 39, in another embodiment, the lumbar pad member 9 is a compression type lumbar pad 902. The specific structure of the compression type lumbar pad 902 will be described below.

[0091] The fold structure 912 of the compression type lumbar pad 902 is a peripheral laminated fold installed along the force receiving direction, and can be compressed when the force receiving surface 911 receives a force, and rebound when the force receiving surface 911 stops. The compression type lumbar pad 902 generally generates a certain amount of pressure inside by injecting a certain amount of gas into the main body 91 in advance, and when the user leans on the compression type lumbar pad 902 during use, the fold structure 912 realizes pressure deformation and elastic support.

[0092] The hook structure 93 includes a support part 931 installed at the rear of the main body 91 (i.e., the side farther from the force-receiving surface) and a fixed tail 932 installed on the support part 931, and the width of the fixed tail 932 is wider than the width of the part on the support part 931 where the fixed tail 932 is connected. Specifically, in this embodiment, the connection part between the support part 931 and the fixed tail 932 is recessed inward to form a locking part. On the surfaces of the fixed tail 932, the support part 931 and the main body 91 on the same side as the hook structure 93, a "U"-shaped hook structure that engages with the connection hole 51 on the backrest 5 is formed.

[0093] Furthermore, a protruding positioning portion 933 is provided on the surface of the fixed tail 932 facing the main body 91, which engages with the positioning groove 52 on the backrest 5 to position and adjust the height of the lumbar pad member 9.

[0094] Optionally, two or more of the above inflatable lumbar pads 901 or compressible lumbar pads 902, or a combination of inflatable lumbar pads 901 and compressible lumbar pads 902, may be removably mounted on one backrest 5 to increase comfort.

Claims

1. The nursing chair includes a seat cushion, support legs, and a backrest and / or armrests connected to the seat cushion, the seat cushion including a seat surface, a through hole provided in the center of the seat surface, a support structure installed below the through hole and forming a storage space together with the seat surface, and a collection box removably stored in the storage space, The backrest and / or the armrest and the seat cushion are detachably connected by a connection structure, the connection structure including a mounting hole structure installed on the seat cushion and a mounting structure installed on the backrest and the armrest; The mounting hole structure is an insertion hole formed on the seat cushion and extending toward the inside of the seat cushion; a step surface formed on a hole wall of the insertion hole, dividing the hole wall into a first hole wall and a second hole wall with the step surface as a boundary, the second hole wall being on the same side as the step surface and facing the first hole wall to enlarge the dimension of the insertion hole; two position limiting fitting points formed on both sides of the second hole wall, protruding relatively in a direction parallel to the step surface, and having a gap between the second hole wall and the two position limiting fitting points; The mounting structure includes: an insertion part that is installed on the backrest and / or the armrest and can be inserted into the insertion hole; and an eversion protrusion extending obliquely outward along both sides of the bottom of the insertion part to form a wing-shaped structure, wherein when the insertion part is inserted into the insertion hole, the top end of the eversion protrusion abuts against the step surface, and the side edge of the eversion protrusion is fitted into the gap between the position limiting fitting point and the second hole wall to form an interference fit. Nursing chair.

2. The insertion portion is a columnar structure that is installed at a connection end on the backrest and the armrest, has a dimension that allows it to be inserted into the insertion hole, and extends in a direction away from the backrest and the armrest; A shovel-shaped structure extending obliquely from the bottom end of the columnar structure in a direction to engage with the step surface to form a shovel shape, and the valgus protrusion is installed on both sides of the shovel-shaped structure. The nursing chair according to claim 1.

3. The nursing chair according to claim 2, characterized in that the rear surface of the shovel-shaped structure is installed as an insertion guide slope formed by extending obliquely from the lower edge of the pillar structure in a direction engaging with the step surface.

4. a depth of a hole wall of the insertion hole on the opposite side of the step surface, i.e., a third hole wall, is equal to or less than a depth of the first hole wall, a position limiting protrusion extending horizontally is provided on an upper end of the insertion guide slope, and when the insertion part is inserted into the insertion hole, the position limiting protrusion is engaged with an edge of the third hole wall; The mounting structure is integrally formed with the seat cushion, and the mounting hole structure is integrally formed with the backrest or the armrest. The nursing chair according to claim 3.

5. The nursing chair described in claim 1, characterized in that the collection box is installed as an upper cover structure and a lower box structure formed by cutting after primary blow molding, and the upper cover structure and the lower box structure are hook-connected.

6. The nursing chair according to claim 5, characterized in that the top cover structure of the collection box, after being attached to the seat surface, forms a continuous seat surface together with the seat surface, thereby ensuring comfort during use.

7. The nursing chair described in claim 1, characterized in that protruding position-limiting rails are installed on both sides of the storage space of the support structure, and correspondingly, concave grooves that match the protruding position-limiting rails are opened at positions corresponding to the protruding position-limiting rails on both sides of the collection box, and the collection box is guided and positioned in the storage space by engagement between the concave grooves and the protruding position-limiting rails.

8. The nursing chair according to claim 5, characterized in that the lower box structure has on its upper sides a breakwater protruding toward the inside of the collection box.

9. The nursing chair according to claim 1, further comprising a plurality of support legs, the underside of the seat cushion being provided with mounting screw holes for attaching the support legs, the mounting screw holes being connected to the support legs by screws.

10. The nursing chair according to claim 9, wherein the mounting screw hole includes a screw fixing structure and a position limiting table.

11. The nursing chair described in claim 10, characterized in that one end of the support leg has a screw head, one side of the base plane of the screw head is provided with a positioning structure, two locking protrusions are provided on the outer side of the position limiting table, there is a gap between the two locking protrusions, and the positioning structure can be locked into the gap to limit the position of the screw connection.

12. The nursing chair according to claim 9, characterized in that the support legs are installed with different lengths, and when the length of the support legs is longer than a predetermined length, a through-hole structure for connecting the two support legs is installed in the middle of the support legs.

13. The nursing chair according to claim 9, characterized in that the support legs have elastic anti-slip leg pads that can be automatically flattened, the elastic anti-slip leg pads are rotatably mounted on the bottom ends of the support legs, and the elastic anti-slip leg pads have a support plane that contacts the ground.

14. A seat cushion comprising: a backrest connected to the seat cushion; The nursing chair described in claim 1, characterized in that the bottom of the seat cushion has a first focus support member installed on both sides near the backrest mounting hole structure at the rear of the seat cushion, and a second focus support member and a third focus support member installed respectively around the periphery of the bottom of the seat cushion, the second focus support member and the third focus support member are each installed symmetrically along the central axis of the seat cushion, and the first focus support member, the second focus support member and the third focus support member are formed as a convex structure which is the highest part of the bottom of the seat cushion and are on the same plane, thereby forming a stable planar support for the seat cushion.

15. A seat cushion comprising: a backrest connected to the seat cushion; 2. The nursing chair according to claim 1, wherein the backrest is provided with a connection hole to which one or more inflatable or elastic lumbar pad members are removably attached.

16. The waist pad member is A body having a force receiving surface, a folded structure is provided on the body, and a width between the folded structures is adjusted according to the magnitude of the force received; a connecting member provided on one side of the body, the connecting member having a hook structure provided on one end remote from the body, the hook structure being hooked and connected to a through hole provided on the backrest, The nursing chair according to claim 15.

17. The nursing chair described in claim 16, characterized in that the hook structure includes a support part connected to the main body and a fixed tail installed on the support part, the width of the fixed tail is wider than the width of the connection portion with the fixed tail on the support part, thereby forming a locking portion, the width of the upper part of the connection hole on the backrest is wider than the width of the fixed tail, and the width of the lower part of the connection hole is narrower than the width of the fixed tail.

18. The nursing chair described in claim 17, characterized in that a positioning portion is provided on the surface of the fixed tail facing the main body, the positioning portion being a protruding structure provided on the surface of the fixed tail, and a plurality of positioning grooves are provided vertically spaced apart on the side wall of the lower part of the connection hole, and the positioning grooves engage with the positioning portion to position and adjust the height of the lumbar pad member.

Images