JP4316989B2 - Leg cover mounting structure for chairs - Google Patents

Description

  The present invention relates to a mounting structure for attaching a leg cover that covers an upper portion of a vertical leg portion in a chair to a lower surface of a support base that supports a seat.

As this type of conventional one, for example, an annular portion is provided at the lower end portion of the support base (attachment body), a cylindrical leg cover is fitted to the annular portion, and the opposing surfaces of these overlapping portions are mutually attached. An engaging hole and an engaging projection provided (see Patent Document 1) and a plurality of engaging claws protruding from the upper end of the leg cover are provided on the lower surface plate of the support base (attachment body). After inserting from the wide part of the plurality of stepped engagement holes, rotate the entire leg cover slightly around its central axis to engage each engagement claw with the narrow part of the stepped engagement hole (See Patent Document 2).
JP-A-9-10060 (FIGS. 1 and 2) Japanese Patent Laid-Open No. 9-313287 (FIGS. 1, 2 and 3)

  However, in the thing of the said patent document 1, while the boundary line between the annular part of a support base and a leg cover is exposed outside, a leg cover is easy to remove | exclude when another thing collides with a leg cover.

  In Patent Document 2, the leg cover is easily detached when a rotational force or vibration is applied to the leg cover, and in order to prevent such detachment, an upward projection protruding from the upper end of the leg cover is provided. When engaged with the side surface of the support base, a part of the leg cover protrudes laterally from the side surface of the support base, and the appearance is poor.

  In view of the above-mentioned problems of the prior art, the present invention provides a leg cover mounting structure for a chair that is difficult to drop off from a support base, has a simple structure, is easy to process, and has a good appearance. The purpose is to provide.

According to the present invention, the above problem is solved as follows.
(1) A vertical support shaft is rotatably supported around its axis in a support tube erected on a pedestal, and a support base for supporting a seat is provided above the vertical support shaft. In the mounting structure of a leg cover in a chair in which a cylindrical leg cover that covers the upper part of the support cylinder is attached to the lower surface plate of the support base, the lower surface plate has substantially the same diameter as the inner diameter of the upper end of the leg cover, and An insertion hole is provided so that the support tube can be inserted, and a plurality of engagement grooves whose outer periphery is substantially the same diameter as the outer diameter of the upper end of the leg cover are circumferentially spaced around the periphery of the insertion hole. And at least the upper portion of the leg cover is formed of a material that can be elastically deformed inward, and the upper end of the leg cover is in contact with the lower surface of the lower surface plate. Engage with each of the engaging grooves, and at the upper end, outside the engaging grooves in the bottom plate A plurality of engaging pieces having a claw portion that engages the upper surface, projected at equal intervals and spacing of the engaging groove, and the dimension near the top of the inner diameter of Katsuashi cover the outer diameter of the supporting cylinder, the engagement The engagement piece is prevented from coming off from the engagement groove of the lower surface plate by preventing the elastic bending of the piece inward by the outer peripheral surface of the support tube .

(2) A vertical support shaft is rotatably supported around its axis in a support tube erected on a pedestal, and a support base for supporting a seat portion is provided on an upper portion of the vertical support shaft. In the mounting structure of a leg cover in a chair in which a cylindrical leg cover that covers the upper part of the support cylinder is attached to the lower surface plate of the support base, the lower surface plate has substantially the same diameter as the inner diameter of the upper end of the leg cover, and An insertion hole is provided so that the support tube can be inserted, and a plurality of engagement grooves whose outer periphery is substantially the same diameter as the outer diameter of the upper end of the leg cover are circumferentially spaced around the periphery of the insertion hole. And at least the upper portion of the leg cover is formed of a material that can be elastically deformed inward, and the upper end of the leg cover is in contact with the lower surface of the lower surface plate. Engage with each of the engaging grooves, and at the upper end, outside the engaging grooves in the bottom plate A plurality of engaging pieces having a pawl portion engaged with an upper surface, the engaging groove of the at equal intervals and spacing projecting, and the vertical support shaft, a movable gas spring fixing portion is supported in the supporting cylinder When the gas spring is fully extended, the upper part of the leg cover is located above the upper end of the support tube, and in this state, the leg cover is moved until the engagement piece is disengaged from the engagement groove of the lower surface plate. The upper part and the engagement piece can be elastically bent inward .

(3) A vertical support shaft is rotatably supported around its axis in a support tube erected on a pedestal, and a support base for supporting a seat portion is provided on an upper portion of the vertical support shaft. In the mounting structure of a leg cover in a chair in which a cylindrical leg cover that covers the upper part of the support cylinder is attached to the lower surface plate of the support base, the lower surface plate has substantially the same diameter as the inner diameter of the upper end of the leg cover, and An insertion hole is provided so that the support tube can be inserted, and a plurality of engagement grooves whose outer periphery is substantially the same diameter as the outer diameter of the upper end of the leg cover are circumferentially spaced around the periphery of the insertion hole. And at least the upper portion of the leg cover is formed of a material that can be elastically deformed inward, and the upper end of the leg cover is in contact with the lower surface of the lower surface plate. Engage with each of the engaging grooves, and at the upper end, outside the engaging grooves in the bottom plate A plurality of engaging pieces having a pawl portion engaged with an upper surface, the engaging groove of the at equal intervals and spacing projecting, and is substantially the same circumferential width of the engagement groove and the engagement piece.

According to the present invention, the following effects can be achieved.
According to the present invention 請 Motomeko 1-3, wherein the engaging pieces of the leg cover engages the engaging groove of the lower plate, engaging claw portions of each engagement piece is on the outside upper surface of the engaging groove of the lower surface plate In addition, the upper end of the leg cover abuts the lower surface of the bottom plate, so that the leg cover is securely prevented from rotating and moving in the vertical direction, and the leg cover is mounted on the support base. It is reliably prevented from falling off.
In addition, it is possible to provide a simple structure in which an engagement groove is provided at the edge of the insertion hole of the lower surface plate and an engagement piece is provided at the upper end of the leg cover, which can be easily processed, and the insertion hole, the engagement groove, Since the engagement pieces and the like are all hidden by the leg cover, the appearance is good.

According to the first aspect of the present invention, since the inward elastic bending of the engaging piece is prevented by the outer peripheral surface of the support tube, the engaging piece is more difficult to come off from the engaging groove of the lower surface plate. .

According to the present invention 請 Motomeko 2 wherein, in a state of being stretched up to the gas spring, is elastically flexed inwardly the upper leg cover, remove the engagement piece from the engaging groove of the lower plate, the leg cover Can be easily removed from the base. At this time, since the upper end of the support tube is located below the upper part of the leg cover, the elastic bending inward of the upper part of the leg cover is not hindered by the outer peripheral surface of the support tube.

According to the present invention 請 Motomeko 3, wherein the rotation around the center axis of the leg cover is reliably prevented, Ru also prevents rattling of that direction.

  Hereinafter, an embodiment in which the present invention is applied to a chair in which the height of a seat portion can be adjusted will be described with reference to the accompanying drawings.

  In FIG. 1, (1) is a stand that is integrally molded so as to form a radial shape in plan view by connecting the base ends of 4-5 leg rods (only one is shown in FIG. 1) (1a). On the leg, a caster (2) is provided at the tip of each leg rod (1a).

  The lower part of the substantially cylindrical support tube (4) is fitted in the mounting hole (3) penetrating the center portion of the pedestal (1) in the vertical direction. Both the inner surface of the mounting hole (3) and the lower outer surface of the support tube (4) are downward tapered surfaces that are slightly reduced in diameter toward the lower side, and the load on the support tube (4) is reduced to the pedestal (1). Can be received by

  A large portion of a known fixing portion (not shown) of the gas spring (5) is accommodated inside the support tube (4), and extends upward from the upper end of the fixing portion of the gas spring (5). The movable part (5a) protrudes above the upper end of the support tube (4) as a vertical support shaft.

When the push button (5b) provided on the upper part of the movable part (5a) of the gas spring (5) is pushed, the movable part (5a) can be expanded and contracted vertically with respect to the support cylinder (4) (see FIG. 1 shows the situation when the gas spring (5) is at maximum shortened).
The movable portion (5a) can freely rotate around the vertical axis with respect to the fixed portion fixed in the support tube (4).

The outer periphery of the upper end of the movable portion (5a) of the gas spring (5) is an upward tapered surface that is slightly reduced in diameter upward.
A support block (8) having a tapered mounting hole (7) is fixed by welding above the rear part of the lower surface plate (6a) of the support base (6) that supports a seat (not shown) on the upper part. ing. The upper end of the movable portion (5a) of the gas spring (5) is inserted into and engaged with the tapered mounting hole (7) of the support block (8).

  As shown in FIGS. 2 and 3, the bottom plate (6a) of the support base (6) is provided with an insertion hole (9) concentric with the mounting hole (7), and this insertion hole (9) The support tube (4) can be idled. A plurality (three in this example) of engaging grooves (10) are formed at equal intervals in the circumferential direction on the periphery of the insertion hole (9).

Below the peripheral edge of the insertion hole (9) in the bottom plate (6a) is a substantially cylindrical leg cover (11) that covers the movable part (5a) of the gas spring (5) and the upper part of the support cylinder (4). It is detachably attached.
The leg cover (10) is formed of a synthetic resin material that is elastically deformable at least at the upper part, and the inner diameter of the upper end thereof is substantially the same as the inner diameter of the insertion hole (9), and the support tube (4). The outer diameter is determined to be substantially the same as the outer peripheral edge of the engagement groove (10).

The upper end of the leg cover (11) is engaged with each engagement groove (10) with the upper end in contact with the lower surface of the lower surface plate (6a), and the upper end is engaged with the lower surface plate (6a). A plurality of (three in this example) engagement pieces (12) having outward claws (13) that engage with the outer upper surface of the groove (10) are equidistant from the engagement groove (10). Projected.
The length from the upper end of the leg cover (11) to the lower surface of the claw portion (13) in this engagement piece (12) is the same as the thickness of the lower surface plate (6a), and the circumferential width is also the engagement groove ( The width is the same as 10).

The lower surface of the tip of the claw portion (13) is provided with an inclined surface (13a) facing outward and upward, so that the claw portion (13) is outside the engagement groove (10) in the lower surface plate (6a). of up easily ride on the upper surface, so enabling easy mounting work on the support base (6) of the leg cover (11).

  The vertical length of the leg cover (11) is such that the upper part of the leg cover (11) is above the upper end of the support tube (4) when the gas spring (5) is fully extended (see the imaginary line in FIG. 1). The lower end of the leg cover (11) covers the upper end of the support tube (4). When the gas spring (5) is shortened to the maximum, the lower end of the leg cover (11) contacts the upper surface of the base leg (1). It is determined not to.

  Therefore, when the gas spring (5) is fully extended, the upper portion of the leg cover (11) is elastically bent inward without being obstructed by the outer peripheral surface of the support tube (4), and the leg cover (11 ) Can be attached to and detached from the lower surface of the support base (6), but when the support base (6) is lowered until the upper part of the leg cover (11) approaches the upper end of the support tube (4), the leg cover (11) The inward elastic bending of the upper part of the tube is hindered by the outer peripheral surface of the support tube (4), and the leg cover (11) cannot be attached to and detached from the lower surface of the support base (6).

  To attach the leg cover (11) to the support base (6), the gas spring (5) is extended to the maximum, and in this state, as shown schematically in FIG. The connecting portion with each engagement piece (12) is elastically deformed inward, and each engagement piece (12) is inserted into the insertion hole (9) in the bottom plate (6a) from below, and then elastically inward. While returning the upper part of the bent leg cover (11) to the original circular state, each engaging piece (12) is engaged with the engaging groove (10) at the edge of the insertion hole (9). The upper end of the leg cover (11) is brought into contact with the lower surface of the peripheral edge of the insertion hole (9) in the lower surface plate (6a), and each claw portion (13) is placed outside the engaging groove (10) in the lower surface plate (6a). Engage with top surface. With this operation, the leg cover (11) can be easily attached to the lower surface of the support base (6).

  Further, with the gas spring (5) extended to the maximum, the connecting portions of the upper part of the leg cover (11) with the engaging pieces (12) are elastically deformed inward to form the engaging pieces. (12) is removed from the engagement groove (10) inward, and the leg cover (11) is pulled down in this state, and each engagement piece (12) is removed downward from the insertion hole (9), thereby The cover (11) can be easily removed from the support base (6).

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and various design changes and the like can be made without departing from the gist of the present invention. Is possible.
For example, in the above-described embodiment, the chair that can adjust the height not only by rotating the seat but also by moving up and down has been described. Of course, the height can be adjusted only by allowing the seat to rotate. The present invention can also be applied to a chair that cannot be used.

It is a vertical side view of the principal part of the chair provided with one Embodiment of this invention. Similarly, it is a principal part expansion external appearance perspective view which decomposes | disassembles and shows the assembly state of a support base and a leg cover. Similarly, it is a vertical side view of the assembled state of the support base and the leg cover. Similarly, it is a schematic longitudinal cross-sectional explanatory drawing explaining the mounting method of the leg cover to a support base.

(1) pedestal
(2) Casters
(3) Mounting hole
(4) Branch
(5) Gas spring (vertical support shaft)
(5a) Moving parts
(5b) Push button
(6) Support base
(6a) Bottom plate
(7) Mounting hole
(8) Support block
(9) Insertion hole
(10) Engaging groove
(11) Leg cover
(12) Engagement piece
(13) Claw
(13a) Inclined surface

Claims (3)

A vertical support shaft is rotatably supported around its axis in a support tube erected on the pedestal, and a support base for supporting a seat portion is provided above the vertical support shaft. In the mounting structure of the leg cover in the chair in which the cylindrical leg cover that covers the upper part is attached to the bottom plate of the support base,
The lower surface plate is provided with an insertion hole that is substantially the same diameter as the inner diameter of the upper end of the leg cover and through which the support tube can be inserted, and an outer peripheral edge is provided at the periphery of the insertion hole. A plurality of engaging grooves having substantially the same diameter as the outer diameter of the leg cover are formed at intervals in the circumferential direction, and at least an upper part of the leg cover is formed of an elastically deformable material inwardly. A claw portion that engages with each of the engagement grooves in a state where the upper end of the leg cover is in contact with the lower surface of the lower surface plate at the upper end, and engages with the outer upper surface of the engagement groove on the lower surface plate at the upper end. A plurality of engaging pieces projecting at equal intervals with the interval between the engaging grooves, and the inner diameter of the upper portion of the leg cover is set to a dimension close to the outer diameter of the support tube, so that the elastic deformation inward of the engaging pieces is achieved. Engagement pieces can be moved away from the engagement grooves on the bottom plate by preventing the bending from being performed by the outer peripheral surface of the support tube. The latch and mounting structure of the leg cover in the chair, characterized in that the. A vertical support shaft is rotatably supported around its axis in a support tube erected on the pedestal, and a support base for supporting a seat portion is provided above the vertical support shaft. In the mounting structure of the leg cover in the chair in which the cylindrical leg cover that covers the upper part is attached to the bottom plate of the support base,
The lower surface plate is provided with an insertion hole that is substantially the same diameter as the inner diameter of the upper end of the leg cover and through which the support tube can be inserted, and an outer peripheral edge is provided at the periphery of the insertion hole. A plurality of engaging grooves having substantially the same diameter as the outer diameter of the leg cover are formed at intervals in the circumferential direction, and at least an upper part of the leg cover is formed of an elastically deformable material inwardly. A claw portion that engages with each of the engagement grooves in a state where the upper end of the leg cover is in contact with the lower surface of the lower surface plate at the upper end, and engages with the outer upper surface of the engagement groove on the lower surface plate at the upper end. A plurality of engaging pieces projecting at equal intervals with the interval between the engaging grooves , and a vertical support shaft is formed by a movable portion of a gas spring in which a fixed portion is supported in a support cylinder. At the maximum extension of the leg cover, the upper part of the leg cover Located, in this state, the legs of the chair, wherein the engaging piece until it releases from the engaging groove of the lower plate, and to be resiliently flexed inwardly the top and engagement pieces of the leg cover Cover mounting structure. A vertical support shaft is rotatably supported around its axis in a support tube erected on the pedestal, and a support base for supporting a seat portion is provided above the vertical support shaft. In the mounting structure of the leg cover in the chair in which the cylindrical leg cover that covers the upper part is attached to the bottom plate of the support base,
The lower surface plate is provided with an insertion hole that is substantially the same diameter as the inner diameter of the upper end of the leg cover and through which the support tube can be inserted, and an outer peripheral edge is provided at the periphery of the insertion hole. A plurality of engaging grooves having substantially the same diameter as the outer diameter of the leg cover are formed at intervals in the circumferential direction, and at least an upper part of the leg cover is formed of an elastically deformable material inwardly. A claw portion that engages with each of the engagement grooves in a state where the upper end of the leg cover is in contact with the lower surface of the lower surface plate at the upper end, and engages with the outer upper surface of the engagement groove on the lower surface plate at the upper end. A leg cover for a chair, characterized in that a plurality of engaging pieces are projected at equal intervals with the interval between the engaging grooves, and the circumferential widths of the engaging grooves and the engaging pieces are substantially the same. Mounting structure.

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