JP2007296074A - Leg end implement of chair or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leg end implement of a chair or the like capable of stably supporting a load from a leg of a table or a chair, allowing quick and easy separation work of two different materials of a synthetic resin grounding member and a metal connecting member, and having an aesthetic appearance when being viewed from the outside. <P>SOLUTION: This leg end implement 3 of the chair or the like to be attached to the lower end of the leg by fitting a shaft part 5 in a groove part, which is provided at the lower end of the leg of the chair and has an open lower part, is provided with the metal connecting member 4 consisting of the shaft part 5 and a disk-shaped metal fitting 8 attached to the lower end of the shaft part 5, the synthetic resin grounding member 10 having a receiving part 14 of the disk-shaped metal fitting 8 at the center and grounding on a floor face, and a synthetic resin cover member 15 having a hole 15a where the shaft part 5 is inserted at the center and covering the upper face of the disk-shaped metal fitting 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chair attached to the lower end of a leg composed of a metal connecting member that receives a load, such as a chair, and a synthetic resin grounding member that contacts the floor disposed on the lower surface of the metal connecting member. Related to the leg end tool.

  Leg ends attached to conventional tables, chairs, etc. consist of a grounding member made of a bottomed cylindrical synthetic resin material that is open on the floor and a metal that is connected to the lower end of the column that supports the top plate. It is comprised with the connection member made from. On the inner peripheral surface of the grounding member, the anti-rotation part that engages with the four recesses on the periphery of the disk-shaped metal fitting provided at the lower end of the connection member, and the disk-shaped metal fitting are clamped in cooperation with the receiving part of the grounding member Convex portions are provided at four locations at regular intervals in top view. Then, after loosely fitting the concave portion with the convex portion, the disk-shaped metal fitting is rotated, and the concave portion is engaged with the rotation preventing portion, and the relative rotation between the connecting member and the grounding member is reliably restricted, and the disk-shaped metal fitting is Since the upward movement is locked by the convex portion, the connection member is prevented from being detached from the grounding member. The leg end tool is attached to the leg by screwing a male screw portion erected upward from the disk-shaped metal fitting into a female screw portion provided inside the lower end of the column. (For example, refer to Patent Document 1).

  Further, as another leg end tool, a concave portion as a rotation restricting portion of the nut is provided at the upper portion, and a base portion made of a synthetic resin corresponding to a grounding member having a housing concave portion capable of accommodating the head portion of the bolt at the lower portion, and a connecting member There is a leg end portion composed of a metal bolt and a metal nut corresponding to. At the leg end, the bolt is inserted into the insertion passage in the base and tightened into the nut, so that the base is firmly held between the bolt head and the nut and is firmly integrated. And it connects with the support | pillar by screwing the external thread part of the volt | bolt which protrudes from a nut toward the internal thread part provided in the inside of a support | pillar lower end. A plurality of ribs that contact the floor surface are formed radially from the center at the lower part of the base, and the leg end devices are stably supported against the load from the column via the ribs (for example, , See Patent Document 2).

JP 2000-245554 A (paragraphs 0012 to 0015, FIGS. 1 and 2) JP 2000-270942 A (paragraphs 0011 to 0016, FIG. 1)

  However, in Patent Document 1, since the grounding member is formed with many convex portions and rotation preventing portions that restrict the removal of the connecting member, the structure of the grounding member becomes complicated and the manufacturing cost of the leg end device is reduced. There was a difficult point. Also, when separating and discarding the leg end tool, the leg end tool removed from the column is pressed downward with the tip of a tool such as a screwdriver to release the anti-rotation part downward, and then disengaged from the concave part. It is necessary to rotate the concave portion of the metal fitting to a position where the convex portion is overlapped with the convex portion to perform accurate positioning, and to pull up and separate the connecting member from the grounding member, which takes time and labor. Moreover, in order to make the connecting member invisible from the outside, it is necessary to make the bottomed cylindrical height of the grounding member high.

  In Patent Document 2, a plurality of ribs must be provided in the lower part of the base part, and the structure of the base part is complicated, and when the base part is separated from the bolt, a nut is applied by applying a strong rotational force to the bolt. It was necessary to remove the nut from the recess, and it was necessary to remove the nut from the recess and separate it from the base. Further, when the bolt is loosened due to long-term use of the leg end device, the stability of the base portion is deteriorated, and the head portion of the bolt exposed from the lower portion of the leg end device may come into contact with the floor surface. Moreover, in order to hide the bolt from the outside, it is necessary to provide a cover body at the lower end of the column.

  The present invention has been made paying attention to such problems, and can stably support a load from a leg of a table or a chair with a simple structure, and a synthetic resin grounding member and a metal connection An object of the present invention is to provide a leg end device such as a chair which can quickly and easily separate two materials different from members and which has a good external appearance.

In order to solve the above-mentioned problem, a leg end device such as a chair according to claim 1 of the present invention includes a metal connecting member that receives a load of the chair or the like, and a floor disposed on a lower surface of the metal connecting member. A leg end device such as a chair attached to a lower end of a leg composed of a ground member made of a synthetic resin that contacts the surface, wherein the metal connecting member is a shaft that fits into a groove provided in the lower end opening of the leg. And an enlarged flat portion provided at the lower end of the shaft portion, the grounding member covers the lower surface of the enlarged flat portion, has a hole through which the shaft portion is inserted, and has an upper surface of the enlarged flat portion It is characterized in that it is detachably fitted with a cover member made of synthetic resin that covers the cover.
According to this feature, the metal connection member, the grounding member, and the cover member can be separated by simply disengaging the synthetic resin grounding member and the synthetic resin cover member. Therefore, it is possible to easily separate and discard different materials. Moreover, since the axial part used as the upper part of a connection member is covered with a cover member, the external appearance is also good. And since the load of a chair etc. is supported by a grounding member from an expansion flat part via a shaft part, a leg end implement which can be supported stably with high support strength can be provided.

A leg end device such as a chair according to claim 2 of the present invention is a leg end device such as a chair according to claim 1, wherein a cylindrical upward piece is erected from the outer peripheral edge of the grounding member, An engaging portion is provided on the outer periphery of the upward piece, a cylindrical downward piece that is externally fitted to the upward piece from the outer peripheral edge of the cover member is suspended, and the engaging portion is engaged with the inner periphery of the downward piece. It is characterized in that an engaged portion is provided.
According to this feature, when the downward piece of the cover member is externally fitted to the upward piece of the grounding member, the engaging portion provided on the opposing surface of the both and the engaged portion are engaged with each other. Assembling of the equipment can be performed easily, and even if the leg end device is used, for example, when it is stepped on a user's foot such as a chair or is caught, the cover member is firmly prevented from being detached from the grounding member. The

A leg end device such as a chair according to claim 3 of the present invention is a leg end device such as a chair according to claim 1 or 2, wherein positioning of the outer periphery of the enlarged flat portion to the grounding member is performed. It is characterized by the fact that the section was erected.
According to this feature, by positioning the positioning portion on the outer periphery of the enlarged flat portion of the connecting member in the grounding member, the enlarged flat portion can be guided along the positioning portion, and the connecting member can be easily positioned. Assembling efficiency is improved. Moreover, the outward movement of the connecting member is reliably regulated by the positioning portion and is stably supported by the grounding member.

A leg end device such as a chair according to claim 4 of the present invention is a leg end device such as a chair according to any one of claims 1 to 3, wherein the lower end of the cover member is centered on the lower surface of the cover member. The present invention is characterized in that a support portion that contacts the upper surface of the flat portion is provided.
According to this feature, since the upper surface of the enlarged flat portion is suppressed by the support portion, the upward movement of the connecting member is reliably regulated and stably supported by the grounding member. Moreover, even when a strong load is applied from the upper surface when the cover member is stepped on with a foot, the support portion is supported on the upper surface of the enlarged flat portion as a reinforcing material, so that damage to the cover member can be avoided. .

A leg end device for a chair or the like according to claim 5 of the present invention is a leg end device for a chair or the like according to any one of claims 1 to 4, wherein a lower portion of the shaft portion is fitted into a groove portion of the leg. The diameter is larger than the upper part of the shaft part to be joined, the lower end of the leg is brought into contact with the step part formed between the lower part and the upper part of the shaft part, and the position of the step part is made higher than the upper surface of the cover member It is characterized by that.
According to this feature, the load from the leg can be directly received by the step portion of the shaft portion, and the upper surface of the cover member is at a position below the step portion, so that the cover member is damaged by the load from the leg. There is nothing.

A leg end device such as a chair according to claim 6 of the present invention is a leg end device such as a chair according to any one of claims 1 to 5, wherein a tool insertion tool is provided on an outer peripheral edge of the grounding member. It features a notch.
According to this feature, the grounding member and the cover member can be easily separated by simply inserting the tip of the tool into the notch provided on the outer peripheral edge of the grounding member. Is also shortened overall.

  Examples of the present invention will be described below.

FIG. 1 is a perspective view showing an overall image of a leg end device of a chair in an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part taken along a line AA in FIG. FIG. 3B is an exploded perspective view showing a grounding member, a connecting member, and a cover member constituting the leg end device, and FIG. 3B is a cross-sectional view of the connecting member shown in FIG. FIG. 3C is an enlarged schematic view of a main part showing a process of attaching the ring, FIG. 3C is a perspective view of the ground member viewed from below, and FIG. 4 is a cross-sectional view of the ground member of FIG. FIG. 5 is a cross-sectional view of the cover member of FIG. 3 (a) taken along line DD, and FIG. 6 (a) shows the tool from the assembled state of the leg ends. FIG. 6B is a cross-sectional view before removing the cover member from the grounding member by FIG. It is a sectional view showing a Disconnect was state.

  As shown in FIG. 1, leg ends 3 are respectively attached to the lower ends 2 a of the legs 2 of the chair 1, and the chair 1 is attached to the floor 21 via these leg ends 3. is set up. Hereinafter, in the description of the present embodiment, the ground contact side with the floor surface 21 of the leg end tool 3 is set as the lower side, and the attachment side with the leg 2 of the leg end tool 3 is set as the upper side.

  As shown in FIG. 2 and FIG. 3A, a groove 2 b that opens downward is formed at the lower end 2 a of the leg 2. The leg end tool 3 includes a metal connection member 4 having a shaft portion 5 protruding upward, a synthetic resin grounding member 10 grounded to a floor surface 21, a part of a lower portion 7 of the shaft portion 5, and grounding. And a synthetic resin cover member 15 covering the periphery of the member 10. An upper portion 6 that fits into the groove portion 2 b is formed from the lower portion 7 of the shaft portion 5, and an annular groove 6 a is formed at the upper end portion of the upper portion 6. The lower portion 7 has a larger diameter than the upper portion 6, and the position of the stepped portion 7 a formed between the lower portion 7 and the upper portion 6 is located above the position of the upper surface of the convex portion 15 b that protrudes from the center of the cover member 15. (See FIG. 6).

  As shown in FIG. 3B, a turn-off retaining ring 9 is attached to the annular groove 6a in advance. Therefore, as shown in FIG. 2, in a state in which the upper end 6 of the shaft portion 5 is fitted into the groove portion 2b and the leg end device 3 is attached, the lower end 2a of the leg 2 is brought into contact with the stepped portion 7a and the leg end device. 3 is supported. The retaining ring 9 provided in the annular groove 6a is tightly fitted to the groove 2b and prevents the leg end tool 3 from being detached from the groove 2b during normal use.

  Next, the leg end tool 3 will be described in detail with reference to FIGS. 3A and 3C and FIGS. First, as shown in FIG. 3A, a disk-shaped metal fitting 8 configured as a large-diameter enlarged flat portion is formed at the lower end of the shaft portion 5 of the connecting member 4 described above. In the center of the upper surface of the grounding member 10, a receiving part 14 having a shape substantially the same as the diameter of the disk-shaped metal fitting 8 is formed, and a cylindrical positioning part 14 a is provided upright on the outer periphery of the receiving part 14. A cylindrical upward piece 12 is erected from the outer peripheral edge of the ground member 10, and a notch portion 11 a for inserting a tool, which will be described later, is formed on the upward piece 12 and a part of the outer peripheral edge.

  As shown in FIG. 4, the upward piece 12 has an engaging portion 13 projecting outward along the outer periphery 12 a and is formed in an annular shape excluding the notch portion 11 a in a top view. The height of the upper surface of the upward piece 12 and the positioning part 14a is formed flush with each other, and is a contact surface with a cover member 15 described later. The lower surface of the grounding member 10 is formed so as to be smoothly curved toward the center. For example, the leg 2 bends due to the load from the chair 1 and the leg end tool 3 is inclined. Even in this case, the ground contact surface on the lower surface of the ground member 10 can move flexibly along the curved surface, and a stable grounding state can always be maintained with respect to the floor surface 21 (see FIG. 2).

  As shown in FIGS. 3A and 3C, the cover member 15 is provided with a convex portion 15 b that covers the outer periphery of the lower portion 7 of the shaft portion 5 upward from the center position. From the outer peripheral edge 16, a cylindrical downward piece 17 that is fitted on the upward piece 12 of the grounding member 10 is suspended downward. In the center of the convex portion 15b, a hole 15a is formed through which the lower portion 7 of the shaft portion 5 can be inserted in the vertical direction.

  In the center of the cover member 15, a plurality of ribs 19 corresponding to the support portions are formed at equal intervals in a top view radial direction from the lower end edge of the hole 15a toward the inner peripheral lower end edge of the convex portion 15b. . As shown in FIG. 5, the height positions of the lower ends of the ribs 19 are formed so as to be flush with each other so as to come into contact with the upper surface of the disk-shaped metal fitting 8 after assembling the leg end tool 3 described later. ing. On the downwardly facing piece 17 of the cover member 15, an engaged portion 18 that can be engaged with the engaging portion 13 of the grounding member 10 is formed outwardly along the inner periphery 17 a and is formed in an annular shape when viewed from above. ing.

  Next, assembly of the leg end 3 will be described. As shown in FIG. 3 (a), the disk-shaped metal fitting 8 of the connection member 4 is installed toward the receiving portion 14 of the grounding member 10 while being in sliding contact with the inner peripheral surface of the positioning portion 14a. Thus, the leg end tool 3 can be efficiently assembled by erecting the positioning part 8 on the outer periphery of the receiving part 14.

  Then, after the shaft portion 5 is inserted into the hole 15 a of the cover member 15, the shaft member 5 moves downward along the shaft portion 5 so as to cover the disk-shaped metal fitting 8, and the downward piece 17 of the cover member 15 is moved upwardly to the ground member 10. 12 to fit outside. Then, as shown in FIG. 6A, the engaged portion 18 of the downward piece 17 is engaged with the engaging portion 13 of the upward piece 12, and the inner periphery 17a is slightly larger than the diameter of the outer periphery 12a. Since it is formed, the connection strength between the grounding member 10 and the cover member 15 is enhanced at the time of engagement. Therefore, the cover member 15 is not detached from the grounding member 10 even when the leg end tool 3 is stepped on a user's foot or the like such as the chair 1 or is caught.

  As described above, the downward piece 17 of the cover member 15 is fitted onto the upward piece 12 of the grounding member 10, so that the disk-shaped bracket 8 of the connecting member 4 and a part of the shaft portion 5 (lower part 7) are included. Can be attached. And since the disk-shaped metal fitting 8 is supported by the receiving part 14 of the grounding member 10, the load of the chair 1 applied to the disk-shaped metal fitting 8 through the shaft part 5 can be stably supported by the grounding member 10. .

  In a state where the cover member 15 is attached to the grounding member 10, the outer peripheral frame 15c of the convex portion 15b of the cover member 15 is stably supported by the upward piece 12 and the positioning portion 14a that are formed flush with each other. Since the upper surface of the disk-shaped metal fitting 8 abuts and is suppressed by the lower ends of the plurality of ribs 19 provided in the shaped portion 15b, the upward movement of the connecting member 4 is reliably restricted, and the connecting member is connected by the positioning portion 14a. Since the movement of 4 to the outside is reliably regulated, it is stably supported by the grounding member 10. Moreover, since the upper surface of the disk-shaped metal fitting 8 is covered with the cover member 15, the appearance from the outside is good.

  Moreover, even when a strong load from the upper surface is applied when the cover member 15 is stepped on with a foot or the like, the rib 19 is supported on the upper surface of the disk-shaped metal fitting 8 as a reinforcing material, so that damage to the cover member 15 is avoided. be able to. Furthermore, the position of the step portion 7a that receives the load of the leg 2 of the shaft portion 5 is set to a position higher than the position of the upper surface of the convex portion 15b, so that the load from the leg 2 is directly adjusted by the step portion 7a of the shaft portion 5. The cover member 15 is not damaged by the load from the leg 2 (see FIG. 2).

  Next, when the chair 1 is discarded, for example, when the leg end 3 is removed from the leg 2 and discarded, the leg end 3 is first pulled downward against the resistance of the retaining ring 9 and the leg 2 Remove from the lower end 2a. Then, as shown in FIG. 6A, the tip of a tool 20 such as a screwdriver is simply inserted into the gap between the notch 11a formed on the outer peripheral edge of the grounding member 10 and the downward piece 17 of the cover member 15. By rotating as indicated by an arrow with the outer peripheral edge of the grounding member 10 as a fulcrum, the downward facing piece 17 is spread outward from the lower end.

  As a result, as shown in FIG. 6B, the engaged portion 18 is disengaged from the engaging portion 13, and the cover member 15 is removed from the grounding member 10. Further, the connecting member 4 is made of a synthetic resin because the shaft portion 5 is inserted into the hole 15a with respect to the cover member 15 and the disk-shaped metal fitting 8 is only installed in the receiving portion 14 with respect to the ground member 10. Separation and disposal can be performed quickly and easily by separating the ground member 10 and the cover member 15 and the metal connecting member 4.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. For example, in the above embodiment, the engaging portion 13 is protruded on the outer periphery 12 a of the upward piece 12, and the engaged portion 18 is recessed on the inner periphery 17 a of the downward piece 17. The configuration is not limited, and the engaging portion may be recessed inward from the outer periphery 12a, and the engaged portion may be protruded inward. Any structure may be used as long as the cover member 15 is firmly prevented from being detached from the grounding member 10 and can be removed.

  In the above embodiment, the positioning member 14a is preferably provided on the outer periphery of the receiving part 14 so that the disk-shaped bracket can be positioned. However, the present invention is not limited to this, and the outer periphery of the receiving part 14 is not limited thereto. It is also possible to cause the upward piece 12 to serve as the positioning portion without standing the positioning portion 14a.

  Further, in the above embodiment, it is preferable that the connection member 4 is stably held by the grounding member 10 by suppressing the upper surface of the disk-shaped metal fitting 8 by the plurality of ribs 19 provided on the cover member 15. The invention is not limited to this, and the upper surface of the disk-shaped metal fitting 8 may be suppressed by the outer peripheral frame 15 c of the cover member 15.

  Further, in the above embodiment, the annular groove 6a is formed in the upper part 6 of the shaft part 5, and the retaining ring 9 is provided in the annular groove 6a, so that the leg 2 can be prevented from being easily detached from the groove part 2b. However, the present invention is not limited to this, and the shaft portion 5 may be simply press-fitted and attached to the groove portion 2b without providing the retaining ring 9.

  Furthermore, in the said Example, although demonstrated using the disk-shaped metal fitting 8 as an expansion | flattened flat part, it should just be a flat thing with a larger area than the cross-sectional area of the axial part 5, and it is not a disk but a corner. It may be of a shape.

It is a perspective view which shows the whole image of the leg end tool of the chair in the Example of this invention. It is a principal part expanded sectional view by the AA sectional line of FIG. 3A is an exploded perspective view showing a grounding member, a connecting member, and a cover member constituting the leg end device, and FIG. 3B is a cross-sectional view taken along the line B-B of the connecting member in FIG. FIG. 3C is an enlarged schematic view of a main part showing a process of attaching a retaining ring by a wire, and FIG. It is sectional drawing of the grounding member by CC sectional line of the grounding member of Fig.3 (a). It is sectional drawing by the DD sectional line of the cover member of Fig.3 (a). FIG. 6A is a cross-sectional view before removing the cover member from the grounding member with a tool from the assembled state of the leg end tool, and FIG. 6B is a diagram illustrating the cover member removed from the grounding member by operating the tool. It is sectional drawing which shows a state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chair 2 Leg 2a Lower end 2b Groove part 3 Leg end tool 4 Connecting member (made of metal)
5 Shaft part 6 Upper part 6a Annular groove 7 Lower part 7a Step part 8 Disk-shaped metal fitting (enlarged flat part)
9 Retaining ring (made of metal)
10 Grounding member (made of synthetic resin)
11 outer peripheral edge 11a notch 12 upward piece 12a outer periphery 13 engaging part 14 receiving part 14a positioning part 15 cover member (made of synthetic resin)
15a hole 15b convex part 15c outer peripheral frame 16 outer peripheral edge 17 downward piece 17a inner peripheral part 18 engaged part 19 rib (support part)
20 Tool 21 Floor

Claims (6)

A leg end device such as a chair attached to the lower end of a leg comprising a metal connecting member that receives a load, such as a chair, and a synthetic resin grounding member that contacts the floor disposed on the lower surface of the metal connecting member Because
The metal connection member includes a shaft portion that fits into a groove portion provided at a lower end opening of a leg, and an enlarged flat portion provided at the lower end of the shaft portion, and the grounding member covers a lower surface of the enlarged flat portion. A leg end device for a chair or the like, characterized in that it has a hole through which the shaft portion is inserted and is detachably fitted to a cover member made of a synthetic resin that covers the upper surface of the enlarged flat portion. .   A cylindrical upward piece is erected from the outer peripheral edge of the grounding member, an engaging portion is provided on the outer periphery of the upward piece, and a cylindrical downward piece that is fitted on the upward piece from the outer peripheral edge of the cover member is suspended. The leg end device of the chair etc. of Claim 1 which provided and the to-be-engaged part engaged with the said engaging part was provided in the inner periphery of this downward facing piece.   The leg end device of a chair or the like according to claim 1 or 2, wherein a positioning portion for positioning the outer periphery of the enlarged flat portion is provided on the grounding member.   The leg end device of the chair etc. in any one of Claim 1 thru | or 3 which provided the support part which a lower end contact | abuts to the upper surface of the said expansion flat part in the center of the lower surface of the said cover member.   The lower portion of the shaft portion has a larger diameter than the upper portion of the shaft portion that fits into the groove portion of the leg, the lower end of the leg is brought into contact with a step portion formed between the lower portion and the upper portion of the shaft portion, and the step portion The leg end device of a chair or the like according to any one of claims 1 to 4, wherein the position is set above the upper surface of the cover member.   The leg end device for a chair or the like according to any one of claims 1 to 5, wherein a notch for inserting a tool is provided on an outer peripheral edge of the grounding member.

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