JP3202956U

JP3202956U - Telescopic rod

Info

Publication number: JP3202956U
Application number: JP2015006420U
Authority: JP
Inventors: 純進藤
Original assignee: 井本刃物株式会社
Priority date: 2015-12-18
Filing date: 2015-12-18
Publication date: 2016-03-03
Anticipated expiration: 2025-12-18

Abstract

【課題】構造が簡単で、伸縮が容易で、軸回りの相対回転も防止しうる伸縮棒を提供する。【解決手段】この伸縮棒は、複数の筒状部材１２、１４が入子式に組み込まれることにより、伸縮可能に構成されており、上記筒状部材１２、１４のそれぞれが、その軸方向に沿って延在する平面部２２を有しており、内外に隣接する筒状部材１２、１４同士に対し、その中心軸回りに相対回転させようとする外力が加えられたとき、外側の筒状部材１４の平面部２２の内面が、その内側に隣接する筒状部材１２の平面部２２の外面に当接するように構成されている。【選択図】図３A telescopic rod having a simple structure, easy to expand and contract, and capable of preventing relative rotation around an axis. The telescopic rod is configured to be extendable and retractable by incorporating a plurality of cylindrical members 12 and 14 in a telescopic manner, and each of the cylindrical members 12 and 14 is arranged in the axial direction thereof. When an external force is applied to the cylindrical members 12 and 14 adjacent to the inner and outer sides to rotate relative to each other around the central axis, the outer cylindrical shape is provided. The inner surface of the flat portion 22 of the member 14 is configured to abut on the outer surface of the flat portion 22 of the cylindrical member 12 adjacent to the inside thereof. [Selection] Figure 3

Description

本考案は、伸縮棒に関する。詳細には、本考案は、その長さを変更することが出来る伸縮棒に関する。 The present invention relates to a telescopic rod. Specifically, the present invention relates to a telescopic bar whose length can be changed.

構造物の表面に施工されたタイルやモルタル等からなる仕上層は、その剥離の有無について定期的に検査されることが多い。この検査には、打診具と称される道具が用いられる。作業者は、打診具を仕上層に衝突させて、その衝突音等により当該仕上層の損傷の有無を判断する。打診具として、伸縮棒の先端に打診子が取り付けられたものがある。この伸縮棒は、複数の筒体が入れ子式に組み込まれたものである。打診具の例が、実用新案登録第３１０３６０５号公報に記載されている。 A finishing layer made of tile, mortar or the like applied on the surface of a structure is often inspected periodically for the presence or absence of peeling. For this inspection, a tool called a percussion tool is used. The operator collides the finishing tool with the finishing layer, and determines whether the finishing layer is damaged by the collision sound or the like. As a percussion instrument, there is one in which a percussion piece is attached to the tip of a telescopic rod. This telescopic rod is formed by nesting a plurality of cylinders. An example of a percussion instrument is described in Utility Model Registration No. 3103605.

工事現場では、工事の状況の記録を目的として、カメラで写真が撮影される。このとき、工事現場を背景としつつ、黒板又はホワイトボードが撮影される。黒板又はホワイトボードには、工事名、場所、日付等が記載される。実用新案登録第３１３８４８６号公報には、１名の作業者で工事現場の撮影がなされうるボードが開示されている。このボードは、伸縮可能な柄（伸縮棒）と、表示プレートとを備えている。この伸縮棒は、複数の筒体が入れ子式に組み込まれたものである。作業者は、所定長さに設定された柄を一方の手で把持し、他方の手でカメラのシャッターを押す。 At the construction site, photographs are taken with a camera for the purpose of recording the construction status. At this time, a blackboard or whiteboard is photographed with the construction site as the background. The name of the construction, location, date, etc. are written on the blackboard or whiteboard. Utility Model Registration No. 3138486 discloses a board that can be photographed at a construction site by one worker. This board is provided with a stretchable handle (stretchable bar) and a display plate. This telescopic rod is formed by nesting a plurality of cylinders. The operator holds the handle set to a predetermined length with one hand and presses the shutter of the camera with the other hand.

以上の伸縮棒では、筒体同士の軸回り相対回転を防止する配慮はなされていない。一方、実用新案登録第３１５５６９５号公報では、かかる相対回転を防止しうる構成を有した伸縮棒が提案されている。実用新案登録第３１５５６９５号公報には、伸縮棒を用いたカメラ支持具の例が記載されている。カメラ支持具は、写真撮影等に用いられるカメラを固定するものである。カメラ支持具には、伸縮棒が使用されている。この伸縮棒は、複数の筒体が入れ子式に組み込まれたものである。この伸縮棒においては、筒体の軸回りの相対回転を防止するために、筒体に、係合し合う溝と凸条とが形成されている。 In the above telescopic rods, no consideration is given to preventing relative rotation between the cylinders around the axis. On the other hand, utility model registration No. 3155695 proposes a telescopic rod having a configuration capable of preventing such relative rotation. Japanese Utility Model Registration No. 3155695 describes an example of a camera support using a telescopic rod. The camera support is for fixing a camera used for taking a picture. A telescopic rod is used for the camera support. This telescopic rod is formed by nesting a plurality of cylinders. In this telescopic rod, in order to prevent relative rotation around the axis of the cylinder, grooves and ridges that engage with each other are formed in the cylinder.

実用新案登録第３１０３６０５号公報Utility Model Registration No. 3103605 実用新案登録第３１３８４８６号公報Utility Model Registration No. 3138486 実用新案登録第３１５５６９５号公報Utility Model Registration No. 3155695

本考案の目的は、構造が簡単であり、伸縮が容易であり、軸回りの相対回転も効果的に防止しうる伸縮棒の提供にある。 An object of the present invention is to provide a telescopic rod that has a simple structure, can be easily expanded and contracted, and can effectively prevent relative rotation about an axis.

本考案に係る伸縮棒は、
複数の筒状部材が入子式に組み込まれることにより、伸縮可能に構成された伸縮棒であって、
上記筒状部材のそれぞれが、その軸方向に沿って延在する平面部を有しており、
内外に隣接する筒状部材に対し、その中心軸回りに相対回転させようとする外力が加えられたとき、外側の筒状部材の平面部の内面が、その内側に隣接する筒状部材の平面部の外面に当接するように構成されている。 The telescopic rod according to the present invention is
A telescopic rod configured to be stretchable by incorporating a plurality of cylindrical members in a telescoping manner,
Each of the cylindrical members has a flat portion extending along the axial direction,
When an external force is applied to the cylindrical member adjacent to the inner and outer sides around the central axis, the inner surface of the planar portion of the outer cylindrical member is the plane of the cylindrical member adjacent to the inner side. It is comprised so that it may contact | abut to the outer surface of a part.

好ましくは、上記平面部が周方向に離間して複数本延在している。 Preferably, a plurality of the planar portions are spaced apart from each other in the circumferential direction.

好ましくは、上記平面部が、周方向に１８０°離間して２本延在しており、この２本の平面部が互いに平行である。 Preferably, two of the plane portions are spaced apart from each other by 180 ° in the circumferential direction, and the two plane portions are parallel to each other.

好ましくは、上記筒状部材において、周方向に見た一の平面部と他の平面部との間は部分円筒状に形成されている。 Preferably, in the cylindrical member, a portion between one plane portion and the other plane portion viewed in the circumferential direction is formed in a partial cylindrical shape.

好ましくは、全ての筒状部材の横断面形状が相似である。 Preferably, the cross-sectional shape of all the cylindrical members is similar.

この伸縮棒は、構造が簡単であり、伸縮が容易であり、軸回りの相対回転も効果的に防止されうる。 This telescopic bar has a simple structure, can be easily expanded and contracted, and relative rotation about the axis can be effectively prevented.

図１は、本考案の一実施形態に係る伸縮棒が用いられた打診具の一例を示しており、図１（ａ）は伸縮棒が伸長された状態を示し、図１（ｂ）は伸縮棒が縮短された状態を示している。FIG. 1 shows an example of a percussion instrument using a telescopic bar according to an embodiment of the present invention. FIG. 1 (a) shows a state where the telescopic bar is extended, and FIG. The bar is shown in a shortened state. 図２は、図１の伸縮棒の主要部分を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing the main part of the telescopic rod of FIG. 図３は、図１の伸縮棒における矢印ＩＩＩが指す部分である筒状部材同士の連結部を示す組み立て前の斜視図である。FIG. 3 is a perspective view before assembly showing a connecting portion between cylindrical members, which is a portion indicated by an arrow III in the telescopic rod of FIG. 1. 図４は、図２におけるＩＶ−ＩＶ線に沿った横断面図である。4 is a cross-sectional view taken along line IV-IV in FIG.

以下、適宜図面が参照されつつ、好ましい実施形態に基づいて本考案が詳細に説明される。 Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

図１に示された打診具２は、伸縮棒４と、この伸縮棒４の先端に取り付けられた打診子６と、伸縮棒４の基端部に外嵌されたグリップ８とを有している。この伸縮棒４は、複数の筒状部材が入子式に組み込まれることにより、伸縮可能に構成された棒状のものである。本実施形態では、５本の筒状部材１２、１４、１６、１８、２０が用いられている。ここでは、径の小さい筒状部材から順に、第１筒状部材１２、第２筒状部材１４、第３筒状部材１６、第４筒状部材１８、第５筒状部材２０と呼ぶ。しかし、筒状部材は、５本には限定されず、２本以上であればよい。入れ子式とは、例えば望遠鏡のように、径の大きい筒状部材の内部に径の小さい筒状部材が同軸状に且つ出し入れ自在に収納されてなる構造体である。 The percussion instrument 2 shown in FIG. 1 has an expansion / contraction bar 4, a percussion piece 6 attached to the distal end of the expansion / contraction bar 4, and a grip 8 externally fitted to the base end of the expansion / contraction bar 4. Yes. The telescopic rod 4 is a rod-like member configured to be telescopic by incorporating a plurality of cylindrical members in a telescopic manner. In this embodiment, five cylindrical members 12, 14, 16, 18, and 20 are used. Here, the first cylindrical member 12, the second cylindrical member 14, the third cylindrical member 16, the fourth cylindrical member 18, and the fifth cylindrical member 20 are referred to in order from the cylindrical member having the smallest diameter. However, the number of cylindrical members is not limited to five, and may be two or more. The telescopic type is a structure in which a cylindrical member having a small diameter is accommodated coaxially and retractably in a cylindrical member having a large diameter, such as a telescope.

隣接する大径側（外側）の筒状部材１４、１６、１８、２０の内部に挿入される小径側（内側）の筒状部材１２、１４、１６、１８の端部、及び、グリップ８の内部に挿入される第５筒状部材２０の端部をそれぞれ基端部と呼ぶ。一方、大径側の筒状部材１４、１６、１８、２０から露出する小径側の筒状部材１２、１４、１６、１８の端部、及び、グリップ８から露出する第５筒状部材２０の端部をそれぞれ先端部と呼ぶ。図１及び図２では、各筒状部材の右端が基端５０であり、左端が先端５２である。５本の筒状部材１２、１４、１６、１８、２０は、ほぼ同じ長さを有している。上記打診子６は、第１筒状部材１２の先端５２に取り付けられ、グリップ８は、第５筒状部材２０の基端５０側から嵌着されている。 The ends of the small-diameter side (inner side) cylindrical members 12, 14, 16, 18 inserted into the adjacent large-diameter side (outside) cylindrical members 14, 16, 18, 20, and the grip 8 The ends of the fifth cylindrical member 20 inserted into the interior are called base ends. On the other hand, the ends of the small diameter cylindrical members 12, 14, 16, 18 exposed from the large diameter cylindrical members 14, 16, 18, 20 and the fifth cylindrical member 20 exposed from the grip 8. Each end is called a tip. In FIGS. 1 and 2, the right end of each tubular member is the base end 50, and the left end is the tip 52. The five cylindrical members 12, 14, 16, 18, and 20 have substantially the same length. The percussion piece 6 is attached to the distal end 52 of the first tubular member 12, and the grip 8 is fitted from the proximal end 50 side of the fifth tubular member 20.

図１（ａ）は、伸長した状態の伸縮棒４を示し、図１（ｂ）は、縮短した状態の伸縮棒４を示している。伸長した状態の伸縮棒４では、径の小さい筒状部材１２、１４、１６、１８それぞれのほぼ全長部分が、隣接する径の大きい筒状部材１４、１６、１８、２０の内部から、引き出されて露出している。縮短した状態の伸縮棒４では、径の小さい筒状部材１２、１４、１６、１８それぞれのほぼ全長部分が、隣接する径の大きい筒状部材１４、１６、１８、２０の内部に収納されて隠れている。 Fig.1 (a) shows the expansion-contraction rod 4 of the expanded state, FIG.1 (b) has shown the expansion-contraction rod 4 of the contracted state. In the stretchable rod 4 in the extended state, the substantially full length portions of the cylindrical members 12, 14, 16, and 18 having a small diameter are drawn out from the adjacent cylindrical members 14, 16, 18, and 20 having a large diameter. Exposed. In the contracted expansion / contraction bar 4, the substantially full length portions of the cylindrical members 12, 14, 16, and 18 having a small diameter are accommodated in the adjacent cylindrical members 14, 16, 18, and 20 having a large diameter. Hiding.

各筒状部材１２、１４、１６、１８、２０の横断面は、互いにほぼ相似である。小径側の筒状部材１２、１４、１６、１８の横断面の外形は、隣接する大径側の筒状部材１４、１６、１８、２０の横断面の内形より僅かに小さい。かかる構成により、伸縮棒４はガタガタすることなく、スムーズに伸縮されうる。 The cross sections of the cylindrical members 12, 14, 16, 18, 20 are substantially similar to each other. The outer shapes of the cross-sections of the small-diameter cylindrical members 12, 14, 16, and 18 are slightly smaller than the inner shapes of the cross-sections of the adjacent large-diameter-side cylindrical members 14, 16, 18, and 20. With this configuration, the telescopic rod 4 can be smoothly expanded and contracted without rattling.

図２は、伸長状態の伸縮棒４の一部分の縦断面図である。図２では、第１筒状部材１２から第４筒状部材１８までが示されているが、第２筒状部材１４から第５筒状部材２０までであっても同様となる。図３には、小径側の筒状部材と、隣接する大径側の筒状部材との連結部が示されている。図３では、図１における矢印ＩＩＩ部、すなわち、第１筒状部材１２と第２筒状部材１４との連結部分が示されている。他の隣接する小径側の筒状部材と大径側の筒状部材との連結部も同様である。図４には、図２におけるＩＶ−ＩＶ線に沿って見た横断面、すなわち、第１筒状部材１２及び第２筒状部材１４の横断面形状が示されている。他の筒状部材１６、１８、２０の横断面形状は、前述の通り、本図のものとほぼ相似の形状である。 FIG. 2 is a longitudinal sectional view of a part of the telescopic rod 4 in the extended state. In FIG. 2, the first cylindrical member 12 to the fourth cylindrical member 18 are shown, but the same applies to the second cylindrical member 14 to the fifth cylindrical member 20. FIG. 3 shows a connecting portion between a small-diameter cylindrical member and an adjacent large-diameter cylindrical member. In FIG. 3, the arrow III part in FIG. 1, ie, the connection part of the 1st cylindrical member 12 and the 2nd cylindrical member 14 is shown. The same applies to the connecting portions between other adjacent small-diameter cylindrical members and large-diameter cylindrical members. FIG. 4 shows a cross section viewed along line IV-IV in FIG. 2, that is, cross sectional shapes of the first cylindrical member 12 and the second cylindrical member 14. As described above, the cross-sectional shapes of the other cylindrical members 16, 18, and 20 are substantially similar to those in this figure.

図３に示されるように、筒状部材１２、１４は、その軸方向に沿って延在する平面部２２を有している。この平面部２２は筒状の部材の平面部であるため、その外面４２も内面４４も平面状である。ここでいう平面部には、完全な平面のみならず、加工過程で生じてしまう大きい曲率半径の円筒面等をも含む。 As shown in FIG. 3, the cylindrical members 12, 14 have a flat portion 22 that extends along the axial direction thereof. Since the flat surface portion 22 is a flat surface portion of a cylindrical member, both the outer surface 42 and the inner surface 44 are flat. Here, the flat surface portion includes not only a complete flat surface but also a cylindrical surface having a large curvature radius that is generated in the processing process.

本実施形態では、平面部２２は、各筒状部材の周方向に離間して２本延在している。この平面部２２は、周方向に１８０°離間して２本延在している。この２本の平面部２２が互いに平行にされている。各筒状部材において、周方向に見た２本の平面部２２同士の間は、部分円筒状に形成されている。これを部分円筒部２４と呼ぶ。ここで、部分円筒とは、円筒をその中心軸に平行な面で切断した後の形状をいう。内外に隣接する小径側筒状部材の平面部２２の外面４２は、大径側筒状部材の平面部２２の内面４４と対向し、小径側筒状部材の部分円筒部２４の外面４６は、大径側筒状部材の部分円筒部２４の内面４８と対向している。 In the present embodiment, two planar portions 22 are spaced apart from each other in the circumferential direction of each cylindrical member. The two flat portions 22 extend 180 ° apart from each other in the circumferential direction. The two plane portions 22 are parallel to each other. In each cylindrical member, the space between the two flat portions 22 viewed in the circumferential direction is formed in a partial cylindrical shape. This is referred to as a partial cylindrical portion 24. Here, the partial cylinder means a shape after the cylinder is cut along a plane parallel to the central axis. The outer surface 42 of the planar portion 22 of the small-diameter side cylindrical member adjacent to the inside and the outside is opposed to the inner surface 44 of the planar portion 22 of the large-diameter side cylindrical member, and the outer surface 46 of the partial cylindrical portion 24 of the small-diameter side cylindrical member is It faces the inner surface 48 of the partial cylindrical portion 24 of the large diameter cylindrical member.

以上の結果、筒状部材１２、１４、１６、１８、２０の横断面は、一種の長円形を呈している。具体的には、図４に示されるように、この横断面は、対向する平行な一対の直線部２６と、対向する一対の円弧部２８とを含んでいる。直線部２６は上記平面部２２に対応し、円弧部２８は上記部分円筒部２４に対応している。従って、ここでいう直線部２６は、完全な直線のみならず、加工過程で生じてしまう大きい曲率半径の曲線や凹凸をも含む。ここでいう円弧部２８は、単一の曲率の円弧には限定されず、加工過程で生じてしまう異なる曲率の複数の円弧の組み合わせをも含む。 As a result, the cross-sections of the cylindrical members 12, 14, 16, 18, and 20 have a kind of oval shape. Specifically, as shown in FIG. 4, the cross section includes a pair of parallel straight portions 26 that face each other and a pair of arc portions 28 that face each other. The straight line portion 26 corresponds to the flat surface portion 22, and the arc portion 28 corresponds to the partial cylindrical portion 24. Accordingly, the straight line portion 26 here includes not only a complete straight line but also a curve with a large curvature radius and irregularities that occur in the machining process. The arc portion 28 here is not limited to an arc having a single curvature, but also includes a combination of a plurality of arcs having different curvatures that occur in the machining process.

図４に示されるように、上記横断面形状は、縦方向中心線（図示しない）に対して線対称であり、横方向中心線（図示しない）に対して線対称である。縦方向中心線と横方向中心線とは直交する。各筒状部材の横断面の形状及び大きさは、後述の絞り部３０及び係止凸部４０を除けば、軸方向に沿って一定である。 As shown in FIG. 4, the cross-sectional shape is axisymmetric with respect to a vertical center line (not shown) and axisymmetric with respect to a horizontal center line (not shown). The vertical center line and the horizontal center line are orthogonal to each other. The shape and size of the cross-section of each cylindrical member is constant along the axial direction except for the throttle portion 30 and the locking projection 40 described later.

大径側の筒状部材１４、１６、１８、２０は、その先端部に絞り部３０を有している。この絞り部３０の横断面形状は、絞り部３０以外の部分（本体部）と相似であり、僅かに小さい。従って、この絞り部３０も、平面部２２及び部分円筒部２４を有する。この絞り部３０の内面４４、４８は、小径側の筒状部材１２、１４、１６、１８の本体部の外面４２、４６に、全面的に又は部分的に摺接する。その結果、伸縮棒４の伸縮の動きが安定する。また、後述するように、絞り部３０は、板バネ３４との共働により、筒状部材同士の分離を防止することができる。 The large-diameter cylindrical members 14, 16, 18, and 20 have a narrowed portion 30 at the tip thereof. The cross-sectional shape of the narrowed portion 30 is similar to the portion (main body portion) other than the narrowed portion 30, and is slightly smaller. Therefore, the throttle portion 30 also has a flat surface portion 22 and a partial cylindrical portion 24. The inner surfaces 44, 48 of the throttle portion 30 are in full or partial sliding contact with the outer surfaces 42, 46 of the main body portion of the small-diameter cylindrical members 12, 14, 16, 18. As a result, the expansion / contraction movement of the telescopic rod 4 is stabilized. Further, as will be described later, the throttle portion 30 can prevent separation of the cylindrical members by cooperating with the leaf spring 34.

以上に説明された横断面形状を持つ伸縮棒４では、隣接する筒状部材同士の中心軸回りの相対回転が防止される。それは、内外に隣接する筒状部材同士に対し、その中心軸回りに相対回転させようとする外力が加えられたとき、隣接する大径側の筒状部材の平面部２２の内面４４と、小径側の筒状部材の平面部２２の外面４２とが当接するからである。また、筒状部材１２、１４、１６、１８、２０の横断面が、長円形を呈しているため、前述した従来の溝と凸条を有する筒体からなる伸縮棒より、スムーズに伸縮させることができる。さらに、製造が容易である。 In the telescopic rod 4 having the cross-sectional shape described above, relative rotation around the central axis between adjacent cylindrical members is prevented. That is, when an external force is applied to the cylindrical members adjacent inside and outside to each other around the central axis, the inner surface 44 of the planar portion 22 of the adjacent large-diameter cylindrical member and the small diameter This is because the outer surface 42 of the flat surface portion 22 of the cylindrical member on the side abuts. Moreover, since the cross-section of the cylindrical members 12, 14, 16, 18, and 20 has an oval shape, it can be expanded and contracted more smoothly than the conventional expansion / contraction rod made of a cylindrical body having grooves and protrusions. Can do. Furthermore, it is easy to manufacture.

この筒状部材の製造法の一例は、金属製パイプを、その全長に亘ってプレス機によって挟圧する方法である。金属製パイプは、プレス機の平行な２面によって圧せられる。これにより、２箇所の部分円筒部を挟んで、平行な２面の平面部が形成される。 An example of the manufacturing method of this cylindrical member is a method in which a metal pipe is clamped by a press machine over its entire length. The metal pipe is pressed by two parallel surfaces of the press. As a result, two parallel plane portions are formed across the two partial cylindrical portions.

筒状部材の横断面形状は、以上に説明された実施形態のものには限定されない。例えば、図示しないが、１本のみの平面部を有する筒状部材であってもよい。この筒状部材の横断面は、一本の直線と円弧との組み合わせとなる。また、図示しないが、２本の平面部と２本の部分円筒部との組み合わせであっても、２本の平面部同士が非平行である筒状部材であってもよい。この場合、筒状部材の横断面形状において、２本の直線部が鋭角をなす。対向する一対の円弧部は、その中心角が互いに異なる。 The cross-sectional shape of the cylindrical member is not limited to that of the embodiment described above. For example, although not shown, a cylindrical member having only one plane portion may be used. The cross-section of this cylindrical member is a combination of a single straight line and an arc. Moreover, although not shown in figure, even if it is the combination of two plane parts and two partial cylindrical parts, the cylindrical member with which two plane parts are non-parallel may be sufficient. In this case, in the cross-sectional shape of the cylindrical member, the two straight portions form an acute angle. The pair of opposing arc portions have different central angles.

また、図示しないが、複数の平面部同士が直接交差し、これに部分円筒部が組み合わさった形状であってもよい。すなわち、部分角筒部と部分円筒部との組み合わせであってもよい。例えば、その横断面形状が、直角二等辺三角形と半円形とが合体した形状のものでもよい。具体的には、上記直角二等辺三角形の底辺と半円形の直径とが等しく、上記直角二等辺三角形の底辺と半円形の直径部分とが接合した形状である。ここで、部分角筒とは、角筒をその中心軸に平行な面で切断した後の形状をいう。しかし、製造容易の観点、製品の操作容易の観点等から、図１から図４を参照しつつ前述した実施形態の伸縮棒４が好ましい。 Moreover, although not shown in figure, the some plane part may cross | intersect directly, and the shape which combined the partial cylindrical part with this may be sufficient. That is, the combination of a partial square cylinder part and a partial cylindrical part may be sufficient. For example, the cross-sectional shape may be a shape in which a right-angled isosceles triangle and a semicircle are combined. Specifically, the base of the right isosceles triangle and the semicircular diameter are equal, and the base of the right isosceles triangle and the semicircular diameter portion are joined. Here, the partial square tube means a shape after the square tube is cut along a plane parallel to its central axis. However, from the viewpoint of easy manufacturing, easy operation of the product, and the like, the telescopic rod 4 of the embodiment described above with reference to FIGS. 1 to 4 is preferable.

図２から図４に示されるように、伸縮棒４は、弾性体としての複数枚の板バネ３４を有している。板バネ３４は、小径側の筒状部材１２、１４、１６、１８の基端５０部の、部分円筒部２４の外面４６に装着されている。板バネ３４は部分円筒状を呈している。板バネ３４は、その凹状面側に突設された係合突起３６を有している。小径側の筒状部材１２、１４、１６、１８は、その部分円筒部２４の基端部に、上記係合突起３６が係合しうる係合孔３８を有している。板バネ３４は、その係合突起３６が係合孔３８に貫入、係合した状態で装着される。これにより、板バネ３４は、不用意な移動が防止されうる。 As shown in FIGS. 2 to 4, the telescopic rod 4 has a plurality of leaf springs 34 as elastic bodies. The leaf spring 34 is attached to the outer surface 46 of the partial cylindrical portion 24 at the base end 50 portion of the cylindrical member 12, 14, 16, 18 on the small diameter side. The leaf spring 34 has a partial cylindrical shape. The leaf spring 34 has an engaging protrusion 36 protruding from the concave surface side. The small-diameter cylindrical members 12, 14, 16, and 18 have an engagement hole 38 that can be engaged with the engagement protrusion 36 at the base end portion of the partial cylindrical portion 24. The leaf spring 34 is mounted in a state in which the engagement protrusion 36 penetrates and engages with the engagement hole 38. Thereby, the inadvertent movement of the leaf spring 34 can be prevented.

板バネ３４は、その湾曲方向が筒状部材１２、１４、１６、１８の周方向に一致する姿勢で、筒状部材に装着される。板バネ３４の湾曲の曲率半径は、第一筒状部材１２の部分円筒部２４の外周面の曲率半径より小さい。板バネ３４は、装着されたとき、大径側の筒状部材の内周面４８と小径側の筒状部材の外周面４６とによって挟圧され、曲率半径が拡大される。このときの板バネ３４の反力が、大径側の筒状部材の内周面４８と小径側の筒状部材の外周面４６とに負荷される。この反力が、伸縮棒４の伸縮に対する適度な抵抗力となる。この抵抗力が、伸縮棒４の不用意な伸縮を防止しうる。 The leaf spring 34 is attached to the tubular member in such a posture that the bending direction thereof coincides with the circumferential direction of the tubular members 12, 14, 16, 18. The radius of curvature of the leaf spring 34 is smaller than the radius of curvature of the outer peripheral surface of the partial cylindrical portion 24 of the first cylindrical member 12. When the leaf spring 34 is mounted, the leaf spring 34 is pinched by the inner peripheral surface 48 of the large-diameter cylindrical member and the outer peripheral surface 46 of the small-diameter cylindrical member, and the radius of curvature is expanded. The reaction force of the leaf spring 34 at this time is applied to the inner peripheral surface 48 of the large-diameter cylindrical member and the outer peripheral surface 46 of the small-diameter cylindrical member. This reaction force becomes an appropriate resistance force against the expansion and contraction of the telescopic rod 4. This resistance force can prevent inadvertent expansion and contraction of the telescopic rod 4.

伸縮棒４が大きく伸張されたとき、大径側筒状部材１４、１６、１８、２０の前述した絞り部３０が、小径側筒状部材１２、１４、１６、１８の板バネ３４の端縁に当接する。この当接により、小径側筒状部材が大径側筒状部材から抜け出ることが防止されうる。 When the telescopic rod 4 is greatly extended, the aforementioned narrowed portion 30 of the large-diameter side tubular member 14, 16, 18, 20 is the edge of the leaf spring 34 of the small-diameter side cylindrical member 12, 14, 16, 18 Abut. By this contact, it is possible to prevent the small diameter side cylindrical member from coming out of the large diameter side cylindrical member.

筒状部材１２、１４、１６、１８、２０の基端５０近傍の内面４４側には、係止凸部４０が突設されている。伸縮棒４が縮短されたとき、大径側筒状部材１４、１６、１８、２０の係止凸部４０に、小径側筒状部材１２、１４、１６、１８の基端５０が当接して係止する。その結果、小径側筒状部材が、必要以上に大径側筒状部材の内部に進入してしまうことが防止される。この係止凸部４０は、筒状部材における、上記係合孔３８より僅かに先端側（中側）に突設されている。筒状部材の基端５０が係合突起３６に当接することを回避するためである。 On the inner surface 44 side in the vicinity of the base end 50 of the cylindrical members 12, 14, 16, 18, 20, a locking convex portion 40 is projected. When the telescopic rod 4 is shortened, the base end 50 of the small-diameter side cylindrical members 12, 14, 16, 18 is brought into contact with the engaging convex portions 40 of the large-diameter side cylindrical members 14, 16, 18, 20 Lock. As a result, the small diameter side cylindrical member is prevented from entering the inside of the large diameter side cylindrical member more than necessary. The locking convex portion 40 protrudes slightly toward the distal end side (inner side) from the engagement hole 38 in the cylindrical member. This is to prevent the base end 50 of the cylindrical member from coming into contact with the engagement protrusion 36.

以上の説明では、本実施形態の伸縮棒の適用先として、打診具２が例示された。しかし、伸縮棒の適用先は打診具には限定されない。伸縮棒は、カメラ支持具、柄付きホワイトボード等、広く適用されうる。 In the above description, the percussion instrument 2 has been exemplified as an application destination of the telescopic bar of the present embodiment. However, the application destination of the telescopic bar is not limited to the percussion instrument. The telescopic bar can be widely applied to a camera support, a white board with a handle, and the like.

以上説明された伸縮棒は、カメラ支持具、打診具、柄付きホワイトボード等、広く適用されうる。 The telescopic bar described above can be widely applied to camera support tools, percussion tools, patterned whiteboards, and the like.

２・・・打診具
４・・・伸縮棒
６・・・打診子
８・・・グリップ
１２・・・第一筒状部材
１４・・・第二筒状部材
１６・・・第三筒状部材
１８・・・第四筒状部材
２０・・・第五筒状部材
２２・・・平面部
２４・・・部分円筒部
２６・・・直線部
２８・・・円弧部
３０・・・絞り部
３４・・・板バネ
３６・・・係合突起
３８・・・係合孔
４０・・・係止凸部
DESCRIPTION OF SYMBOLS 2 ... Percussion tool 4 ... Telescopic stick 6 ... Percussion child 8 ... Grip 12 ... 1st cylindrical member 14 ... 2nd cylindrical member 16 ... 3rd cylindrical member 18 ... Fourth tubular member 20 ... Fifth tubular member 22 ... Planar portion 24 ... Partial cylindrical portion 26 ... Linear portion 28 ... Arc portion 30 ... Restriction portion 34 ... Plate spring 36 ... engagement protrusion 38 ... engagement hole 40 ... locking projection

Claims

A telescopic rod configured to be stretchable by incorporating a plurality of cylindrical members in a telescoping manner,
Each of the cylindrical members has a flat portion extending along the axial direction,
When an external force is applied to the cylindrical members that are adjacent to each other on the inside and outside of the cylindrical member, the inner surface of the planar portion of the outer cylindrical member is A telescopic rod configured to contact the outer surface of the flat surface portion.

The telescopic bar according to claim 1, wherein a plurality of the planar portions are spaced apart in the circumferential direction and extend.

Two of the plane portions extend 180 degrees apart from each other in the circumferential direction,
The telescopic rod according to claim 2, wherein the two flat portions are parallel to each other.

4. The telescopic rod according to claim 2, wherein the cylindrical member is formed in a partial cylindrical shape between one plane portion and another plane portion viewed in the circumferential direction.

The telescopic rod according to any one of claims 1 to 4, wherein all the cylindrical members have similar cross-sectional shapes.