JPH0628889U - Piano legs - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a highly accurate piano leg that is easy to process, has a high material yield and high joint strength. [Structure] Circular tubular grooves 6 and 7 are formed on the joint surfaces 5 ₁ and 5 ₂ of the pedestal 2 and the case mounting portion 3, respectively. For example, the lower half of the metallic circular tubular body 4 is driven into the circular tubular groove 6. The substantially upper half portion is driven into the circular tubular groove 7 to join the pedestal 2 and the case mounting portion 3 at their joint surfaces 5 ₁ and 5 ₂ to form the leg 1. The leg 1 is attached to the lower surface of the case of the grand piano at the case attachment portion 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a leg for a grand piano, for example.

[0002]

[Prior art]

 Conventionally, for example, a wooden leg of a grand piano is constructed by joining a pedestal and a case mounting portion (leg head, etc.) for the purpose of reducing material costs.

As shown in FIG. 3 and FIG. 4, the joint is provided with a mortise b at the upper end of the pedestal a, a mortise hole d in the case attachment portion c, and a mortise b in the mortise hole d. At the same time, a wedge f is driven into the gap e of the hoso to tightly join (horizontally join) the pedestal a and the case mounting portion b, or a dowel hole is provided between the pedestal and the case mounting portion. The pedestal and the case attachment were joined via a dowel.

[0004]

[Problems to be solved by the device]

 When joining the pedestal and the case attachment part by fitting the hook b and the hook hole d and driving the wedge f, hard wood is used, so it is difficult to form it and it is difficult to improve accuracy and There was a great loss of material. Further, when the dowels are fitted into the dowel holes, there is a drawback that the joint strength is low.

The present invention has been made in view of such drawbacks of the related art, and an object thereof is to provide a highly accurate piano leg that is easy to process, has a high material yield and a high bonding strength. Is.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a piano leg having a pedestal and a case mounting portion joined together, wherein a circular tubular groove is formed in each joining surface of the pedestal and the case mounting portion. A circular tubular body is driven into both circular tubular grooves to join the pedestal and the case mounting portion.

[0007]

[Action]

 Each of the pedestal and the case mounting portion has a circular tubular groove on its joint surface, and is joined by driving a circular tubular body into the both circular tubular grooves. Since the inner and outer surfaces of the circular pipe are joined to the inner and outer peripheral surfaces of the cylindrical groove of the pedestal and the case attachment part, the joint strength is stronger than that of the joint with only one joint surface and the tenon hole. Is almost doubled.

[0008]

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. In the figure, 1 is a leg for a grand piano, 2 is its pillar, 3 is a case mounting portion, and 4 is a circular pipe. A circular tubular groove 6 is formed on the joint surface 5 ₁ of the upper end surface of the pedestal 2 by a circular tubular blade attached to a drilling machine, and a similar circle is formed on the joint surface 5 ₂ on the lower surface of the center of the case mounting portion 3. A tubular groove 7 is formed. The circular tubular body 4 is made of metal, for example, and has knurls 8 formed in the axial direction on both inner and outer surfaces thereof. By driving into the groove 7, the pedestal 2 and the case mounting portion 3 are joined at their joint surfaces as shown in FIG. Although not shown, the case mounting portion 3 is formed with bolt holes on the lower surface of the case of the grand piano for attaching legs, for example, on the left and right sides thereof, and the legs are attached to the case through the bolt holes.

An adhesive may be applied to the inner and outer surfaces of the circular tube body 4 in order to increase the bonding property, and the circular tube body 4 and the circular tubular grooves 6 and 7 of the case mounting portion 3 may be formed. In addition, it is possible to improve the joint strength by forming a drill hole in the columnar portion on the inner side thereof along the axial direction of the pedestal 2 and embedding a stud or the like.

[0010]

EFFECTS OF THE INVENTION As described above, according to the present invention, a circular tubular groove is provided on each of the joint surfaces of the pedestal and the case mounting portion, and a circular tubular body is driven into each circular tubular groove to connect the pedestal and the case mounting portion. Since they are joined together, the processing is easy, the material yield and the joining strength are high, and it is possible to obtain highly accurate piano legs.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of the above embodiment.

FIG. 3 is an exploded perspective view of a conventional grand piano leg

FIG. 4 is a perspective view of a conventional grand piano leg.

[Explanation of symbols]

1 leg 2 pedestal 3 case attachment part 4 circular tube body 6 and 7 circular tubular groove 8 knurl

Claims (2)

[Scope of utility model registration request] 1. In a piano leg in which a pedestal and a case mounting portion are joined, a circular tubular groove is formed on each joining surface of the pedestal and the case mounting portion, and a circular tubular body is formed in the both circular tubular grooves. A piano leg that is driven in and the pedestal and case attachment are joined. 2. The leg for a piano according to claim 1, wherein the inner and outer surfaces of the circular tubular body are subjected to a concavo-convex treatment.