JP3546224B2

JP3546224B2 - Fall prevention device

Info

Publication number: JP3546224B2
Application number: JP20136995A
Authority: JP
Inventors: 島銃二小; 村吉治北
Original assignee: NHK Spring Co Ltd
Current assignee: NHK Spring Co Ltd
Priority date: 1995-07-14
Filing date: 1995-07-14
Publication date: 2004-07-21
Anticipated expiration: 2015-07-14
Also published as: JPH0928489A

Description

【０００１】
【発明の属する技術分野】
本発明は、主として、地震などの振動によって、家具などが転倒しないように、その家具などの設置場所で使用する転倒防止装置に関するものである。
【０００２】
【従来の技術】
通常、上述のような、家具などの転倒防止装置には、例えば、実開昭５５ー１０４９４９号ならびに実開昭５５−１０４９５０号（実公昭５７−１２９２２号公報）の明細書などに記載されているように、家具などの被保持物の頂部と家屋の天井との間に位置して、両者間に突っ張りの役目を果たす支柱、上記支柱の上下端に設けた当接部材を設けている。ここでは、当接部材に、それより側方に延びるベース部材を履かせて、より広い面積で、天井部や家具頂面を支持することが工夫されている。
【０００３】
【発明が解決しようとする課題】
しかし、このような家具などの転倒防止装置では、家具などの設置場所によって、上述の支柱が立つ位置が、必ずしも、天井部の梁や桟で支えられた天井板の箇所に対応していない場合があり、支柱を突っ張った際、当接部材と、これに履かされたベース部材が天井部の支え箇所との間に相当な距離ができ、ベース部材に曲げ力が働き、十分な突っ張りが果たせない虞がある。しかも、地震発生時には、ベース部材に適当な弾性力がないと、広い面積での支持効果が期待できない上、これが天井板の弱い箇所（梁や桟で裏側から支えれられていない箇所）を損傷する虞もある。
【０００４】
本発明は、上記事情に基づいてなされたもので、その目的とするところは、支柱による突っ張りの際に、少なくとも、天井に当接部材が、弾性的な撓みを起こして、天井の、十分に強度を保持する箇所で、支持効果を得ると共に、地震発生の際も、その弾性復元力で、十分に振動を減衰、吸収することができ、また、一定以上の弾性的な撓みを防止して、支持強度を確保できるようにした転倒防止装置を提供するにある。
【０００５】
【課題を解決するための手段】
このため、本発明では、家具などの被保持物の頂部と家屋の天井との間に位置して、両者間に突っ張りの役目を果たす支柱、上記支柱の上下端に設けた当接部材を具備している転倒防止装置において、上記当接部材は上記支柱に支持される箇所よりも側方に延びる長い支持部を備えており、上記支持部は天井または被保持物との対向面が先端側に向けて斜めに上昇するような反りを形成しており、上記対向面が支柱による突っ張りの際に天井または被保持物に沿うように上記支持部に弾力性を保持させており、上記当接部材に対応して、反対側への反りを防止する剛性の部材を支柱の端部に装備している。
【０００６】
この場合、上記剛性の部材は、支柱の端部の周面との間に間隙を有して支柱に装備されており、上記当接部材が天井または被保持物に弾性的に当接することにより上記剛性の部材が支柱の端部の周面に当接して反対側への反り返りを防止する。また、上記剛性の部材は、上記支持部の反りを受けとめる水平な平面を有した状態で支柱の端部に固着されることにより、当接部材の反対側への反りを防止する。
【０００７】
また、上記支柱は、互いに上下に嵌合する一対の支柱部材から構成され、また、両支柱部材を、所要位置で、互いに連結・固定する固定手段を装備していることが望ましい。
【０００８】
上記固定手段は、互いに嵌合する上記支柱部材の内、内側支柱部材の外周周面に雄ねじを形成し、両支柱部材の嵌合口において、外側支柱部材に回転可能に調整ナットを装備しており、上記調整ナット内には、上記内側支柱部材の押し込み方向にテーパーをなす複数の案内面を形成すると共に、上記調整ナットの回転と一緒に回転する状態で、上記案内面に対応して複数の雌ねじ駒を装備し、この雌ねじ駒を上記案内面に案内させて半径方向に移動して上記雄ねじに係脱するように構成してなり、上記調整ナット内に装備した弾持機構で、上記雌ねじ駒を外側支柱部材の方向に弾持しているのが、突っ張り操作の上で有利である。
【０００９】
【発明の実施の形態】
以下、本発明の実施形態を、図面を参照しながら具体的に説明する。本発明に係わる家具などの転倒防止装置は、基本的には、家具などの被保持物Ｆの頂部と家屋の天井Ｃとの間に位置して、両者間に突っ張りの役目を果たす支柱１、支柱１の上下端に設けた、弾性を有する金属製あるいは合成樹脂製の当接部材２、３を具備している。
【００１０】
特に、本発明の転倒防止装置においては、図２および図３に示すように、少なくとも、天井Ｃ側に当接する当接部材２は、支柱１に支持される箇所よりも側方に延びる長い支持部２Ａを備えており、支持部２Ａは、その上面２Ｂが先端側に向けて斜めに上昇するような反りを形成しており、上面２Ｂが支柱１による突っ張りの際に天井面に沿うように、支持部２Ａに弾力性を保持させている。
【００１１】
また、被保持物Ｆの頂部に当接する当接部材３は、支柱１に支持される箇所よりも側方に延びる長い支持部３Ａを備えており、支持部３Ａは、その下面３Ｂが先端側に向けて斜めに下降するような反りを形成しており、下面３Ｂが支柱１による突っ張りの際に被保持物Ｆの頂部に沿うように、支持部２Ａに弾力性を保持させている。
【００１２】
また、当接部材２および３に対応して、反対側への反りを防止する剛性の部材４および５を装備している。なお、この実施の形態では、剛性の部材４、５が当接部材２、３に装着されており、その基端部が支柱１の上下端部の周面に、適当な間隙を介して、対峙させてある。支柱１は、互いに上下に嵌合する一対の支柱部材１４、１５から構成され、両支柱部材１４、１５を、所要位置で、互いに連結・固定する固定手段６を装備している。
【００１３】
この固定手段６は、この実施例では、図４ないし図５に示すように、互いに嵌合する支柱部材１４、１５の内、内側支柱部材１４の外周周面に雄ねじ１４Ａを形成し、両支柱部材１４、１５の嵌合口において、外側支柱部材１５に回転可能に調整ナット６Ａを装備している。
【００１４】
調整ナット６Ａ内には、内側支柱部材１４の押し込み方向にテーパーをなす複数の、この実施例では、互いに対向する２個の案内面６Ｂ、６Ｂが形成されており、また、調整ナット６Ａの回転と一緒に回転する状態（例えば、案内面６Ｂ、６Ｂの両側の摺動支持面６Ｃ、６Ｃで支えられた状態）で、案内面６Ｂ、６Ｂに対応して複数の（２個の）雌ねじ駒７、７が装備されている。そして、この雌ねじ駒７、７を案内面６Ｂ、６Ｂに案内させて、半径方向に移動し、これによって、雄ねじ１４Ａに対して係脱するように構成してある。
【００１５】
また、調整ナット６Ａ内には圧縮コイルばねなどの弾持機構８が装備してあって、この弾持機構８で、雌ねじ駒７、７を、案内面６Ｂ、６Ｂに押し付けるように、外側支柱部材５の方向に弾持している。
【００１６】
このような構成では、内側支柱部材１４を上方に引き出した際、雌ねじ駒７、７が弾持機構８に抗して調整ナット６Ａ内で上昇し、案内面６Ｂ、６Ｂに沿って半径方向の外向きに移動して、雄ねじ１４Ａに対する螺合を解除するので、スムーズに引き出される。この状態で、引き上げを停止すれば、ばね力で、再び、雌ねじ駒７、７が案内面６Ｂ、６Ｂに沿って、半径方向の内向きに移動し、雄ねじ１４Ａに対して螺合される。
【００１７】
次いで、調整ナット６Ａを回動調節することで、雌ねじ駒７、７を螺動して、支柱部材１４を上昇させ、図１に示すように、支柱１の突っ張りにより、当接部材２を、その支持部２Ａを撓ませながら、天井面に圧接できる。なお、この実施形態では、当接部材３の支持部３Ａも、被保持物Ｆの頂部に弾接される。
【００１８】
従って、支柱１に対応する天井面の箇所が、裏側で梁や桟に支持されていなくても、支持部２Ａの何れかの箇所で、上述の梁や桟で支持された強度の十分な箇所において、当接部材２を当接させ、支持部２Ａの、更には、支持部３Ａの撓みによる弾性力で、十分な突っ張り状態を確保できる。これは、地震の際の振動の減衰および吸収の効果も発揮する。
【００１９】
しかも、天井面や被保持物の頂部に当接部材２、３を弾性的に当接させる時、その撓みで、剛性の部材４、５の各基端部を支柱１の周面に当接して、それ以上の撓みを抑止し、反対側への反り返りが防止され、被保持物の過剰な揺れを抑え、また、確実な保持を補償できる。
【００２０】
なお、図６および図７に示す別の実施形態では、剛性の部材４Ａおよび５Ａは、当接部材２、３に対応して、水平な平面でこれを受けとめるように、それぞれ、その基端を支柱１の上下端部に固着している。このため、弾性的な撓み代が、前述の剛性の部材４Ａ、５Ａで制限されているために、反対側への反り返りが防止され、被保持物の過剰な揺れを抑え、また、確実な保持を補償できる。
【００２１】
なお、上述の各実施例では、天井Ｃや被保持物Ｆに当接する当接部材２、３の面には、例えば、高低差のある突起など（図示せず）を形成したゴムシート９が貼着されていて、接触摩擦と、地震の際の振動に際しての弾接ストロークを確保している。
【００２２】
【発明の効果】
本発明は、以上詳述したように、家具などの被保持物の頂部と家屋の天井との間に位置して、両者間に突っ張りの役目を果たす支柱、上記支柱の上下端に設けた当接部材を具備している転倒防止装置において、上記当接部材は上記支柱に支持される箇所よりも側方に延びる長い支持部を備えており、上記支持部は天井または被保持物との対向面が先端側に向けて斜めに上昇するような反りを形成しており、上記対向面が支柱による突っ張りの際に天井または被保持物に沿うように上記支持部に弾力性を保持させているので、支柱による突っ張りの際に、天井または被保持物に当接部材が、弾性的な撓みを起こして支持効果を得ると共に、地震発生の際も、その弾性復元力で、十分に振動を減衰、吸収することができる。しかも、また、上記当接部材に対応して、反対側への反りを防止する剛性の部材を支柱の端部に装備しているので、弾性的な撓み代が、前述の剛性の部材で制限されているために、反対側への反り返りが防止され、被保持物の過剰な揺れを抑え、また、確実な保持を補償できる。
【図面の簡単な説明】
【図１】本発明に係わる実施形態において、転倒防止装置を家具などの被保持物に適用した状態を示す側面図である。
【図２】本発明に係わる第１の実施形態を示す側面（Ａ）および底面図で（Ｂ）ある。
【図３】同じく、使用態様の側面図である。
【図４】本発明に係わる固定手段の一具体例を示す使用態様の縦断側面図（Ａ），（Ｂ）である。
【図５】同じく、横断平面図である。
【図６】本発明の第２の実施形態を示す側面図である。
【図７】同じく、平面図である。
【符号の説明】
１支柱
２、３当接部材
２Ａ、３Ａ支持部
２Ｂ上面
３Ｂ下面
３Ｃ、３Ｄ当接部
３Ｅ取付孔
４、５剛性の部材
６固定手段
６Ａ調整ナット
６Ｂ案内面
６１ピン挿入孔
６２ピン貫通孔
６３ピン
７雌ねじ駒
８弾持機構
９ゴムシート
１４内側支柱部材
１４Ａ雄ねじ
１５外側支柱部材
５１、５２、５３、５４支柱部材
Ｃ天井
Ｆ被保持物（家具など）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fall prevention device used mainly at an installation location of furniture or the like so that furniture or the like does not fall due to vibration such as an earthquake.
[0002]
[Prior art]
In general, the above-mentioned fall prevention device for furniture and the like is described in, for example, the specification of Japanese Utility Model Laid-Open No. 55-104949 and Japanese Utility Model Laid-Open No. 55-104950 (Japanese Utility Model Publication No. 57-12922). As shown in the figure, a column is provided between the top of an object to be held, such as furniture, and the ceiling of a house, and serves as a strut between them, and contact members provided at the upper and lower ends of the column are provided. Here, it is devised that the abutment member is fitted with a base member extending laterally therefrom to support the ceiling or the furniture top surface with a larger area.
[0003]
[Problems to be solved by the invention]
However, in such a fall prevention device for furniture or the like, depending on the installation location of the furniture or the like, the position where the above-described support stands does not necessarily correspond to the location of the ceiling plate supported by the beams or the beams on the ceiling. When the support is stretched, there is a considerable distance between the abutment member and the supporting part of the ceiling where the base member worn on the abutment, and a bending force acts on the base member to achieve sufficient tension. There is a possibility that there is no. In addition, in the event of an earthquake, if the base member does not have an appropriate elastic force, the support effect over a wide area cannot be expected, and this damages a weak portion of the ceiling plate (a portion that is not supported from behind by a beam or a crosspiece). There is a fear.
[0004]
The present invention has been made based on the above circumstances, and its purpose is to at least at the time of strutting by a support column, at least the abutment member on the ceiling, elastically bend, and the ceiling, In places where strength is maintained, while obtaining a support effect, even in the event of an earthquake, its elastic restoring force can sufficiently attenuate and absorb vibrations, and prevent elastic deformation of more than a certain level Another object of the present invention is to provide a fall prevention device capable of securing a supporting strength.
[0005]
[Means for Solving the Problems]
For this reason, in the present invention, a strut positioned between the top of a held object such as furniture and the ceiling of a house, and serving as a strut between the two, and contact members provided at the upper and lower ends of the strut are provided. In the fall prevention device, the contact member includes a long support portion extending laterally from a portion supported by the support, and the support portion has a front surface facing a ceiling or an object to be held. The support portion has elasticity so that the opposing surface is along the ceiling or the held object when the opposing surface is stretched by the support, and Corresponding to the members, rigid members for preventing warpage to the opposite side are provided at the ends of the columns .
[0006]
In this case, the rigid member is provided on the column with a gap between the rigid member and the peripheral surface of the end of the column, and the contact member elastically contacts the ceiling or the held object. The rigid member abuts on the peripheral surface of the end of the column to prevent warping to the opposite side. Further, the rigid member is fixed to the end of the column with a horizontal plane that receives the warpage of the support portion, thereby preventing the contact member from warping to the opposite side.
[0007]
Further, it is preferable that the support is composed of a pair of support members which are fitted up and down with each other, and that the support is preferably provided with fixing means for connecting and fixing the support members to each other at required positions.
[0008]
The fixing means forms a male screw on the outer peripheral surface of the inner support member among the support members fitted to each other, and is provided with an adjusting nut so as to be rotatable on the outer support member at a fitting opening of both support members. In the adjustment nut, while forming a plurality of guide surfaces tapering in the pushing direction of the inner support member, a plurality of guide surfaces corresponding to the guide surface in a state of rotating together with the rotation of the adjustment nut. A female screw piece is provided, and the female screw piece is guided on the guide surface and is moved in the radial direction to engage and disengage with the male screw. It is advantageous for the tension operation that the piece is elastically held in the direction of the outer support member.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The device for preventing a fall of furniture or the like according to the present invention is basically located between a top of a held object F such as furniture and a ceiling C of a house, and supports a pillar 1 serving as a strut between them. An elastic metal or synthetic resin contact member 2, 3 provided at the upper and lower ends of the column 1 is provided.
[0010]
In particular, in the fall prevention device of the present invention, as shown in FIGS. 2 and 3, at least the contact member 2 abutting on the ceiling C side has a long support extending laterally from a position supported by the column 1. The support portion 2A has a warp such that the upper surface 2B rises obliquely toward the distal end side, and the upper surface 2B follows the ceiling surface when strutted by the column 1. , And the support portion 2A has elasticity.
[0011]
In addition, the contact member 3 that contacts the top of the held object F includes a long support 3A that extends laterally from a position supported by the support 1, and the lower surface 3B of the support 3A has a distal end. The support portion 2A has elasticity so that the lower surface 3B is along the top of the held object F when the lower surface 3B is stretched by the support column 1.
[0012]
In addition, rigid members 4 and 5 for preventing warpage to the opposite side are provided corresponding to the contact members 2 and 3. In this embodiment, rigid members 4 and 5 are mounted on the contact members 2 and 3, and the base ends of the rigid members 4 and 5 are provided on the peripheral surfaces of the upper and lower ends of the column 1 with an appropriate gap therebetween. It is confronted. The strut 1 is composed of a pair of strut members 14 and 15 that fit up and down with each other, and is equipped with fixing means 6 for connecting and fixing the strut members 14 and 15 to each other at required positions.
[0013]
In this embodiment, as shown in FIGS. 4 and 5, the fixing means 6 forms a male screw 14A on the outer peripheral surface of the inner support member 14, among the support members 14, 15, which are fitted to each other. At the fitting openings of the members 14 and 15, the outer support member 15 is provided with the rotatable adjustment nut 6A.
[0014]
In the adjustment nut 6A, a plurality of guide surfaces 6B, 6B which are tapered in the pushing direction of the inner support member 14, in this embodiment, are opposed to each other, and the rotation of the adjustment nut 6A is performed. (For example, a state supported by sliding support surfaces 6C, 6C on both sides of the guide surfaces 6B, 6B), a plurality of (two) female screw pieces corresponding to the guide surfaces 6B, 6B. 7, 7 are equipped. The female screw pieces 7, 7 are guided by the guide surfaces 6B, 6B, and move in the radial direction, whereby the female screw pieces 7, 7 are engaged and disengaged from the male screw 14A.
[0015]
The adjusting nut 6A is provided with a resilient mechanism 8 such as a compression coil spring. The resilient mechanism 8 presses the female screw pieces 7, 7 against the guide surfaces 6B, 6B. It is held in the direction of the member 5.
[0016]
In such a configuration, when the inner support member 14 is pulled out upward, the female screw pieces 7, 7 rise in the adjustment nut 6A against the elasticity holding mechanism 8, and extend in the radial direction along the guide surfaces 6B, 6B. Since it moves outward and releases the screw engagement with the male screw 14A, it is smoothly pulled out. When the lifting is stopped in this state, the female screw pieces 7, 7 move inward in the radial direction again along the guide surfaces 6B, 6B by the spring force, and are screwed into the male screw 14A.
[0017]
Next, by rotating and adjusting the adjustment nut 6A, the female screw pieces 7, 7 are screwed up to raise the support member 14, and as shown in FIG. The support portion 2A can be pressed against the ceiling surface while being bent. In this embodiment, the support portion 3A of the contact member 3 is also in elastic contact with the top of the held object F.
[0018]
Therefore, even if the portion of the ceiling surface corresponding to the column 1 is not supported by the beam or the bar on the back side, a portion of sufficient strength supported by the above-mentioned beam or the bar is provided at any portion of the support portion 2A. In the above, the contact member 2 is brought into contact with the support portion 2A, and further, the elastic force generated by the bending of the support portion 3A can secure a sufficient tension state. This also has the effect of damping and absorbing vibration during an earthquake.
[0019]
In addition, when the contact members 2 and 3 are elastically brought into contact with the ceiling surface or the top of the held object, the bending causes the respective base ends of the rigid members 4 and 5 to contact the peripheral surface of the column 1. As a result, further bending can be suppressed, warpage to the opposite side can be prevented, excessive swinging of the held object can be suppressed, and reliable holding can be compensated.
[0020]
In another embodiment shown in FIGS. 6 and 7, the rigid members 4A and 5A have their base ends respectively corresponding to the contact members 2 and 3 so as to receive them on a horizontal plane. The column 1 is fixed to the upper and lower ends. For this reason, since the elastic allowance is limited by the rigid members 4A and 5A described above, warpage to the opposite side is prevented, excessive swinging of the held object is suppressed, and reliable holding is performed. Can be compensated.
[0021]
In each of the above-described embodiments, for example, a rubber sheet 9 formed with a projection or the like (not shown) having a height difference is formed on the surfaces of the contact members 2 and 3 that contact the ceiling C and the held object F. Adhered to ensure contact friction and elastic contact stroke during vibration during an earthquake.
[0022]
【The invention's effect】
As described in detail above, the present invention provides a pillar which is located between the top of an object to be held such as furniture and the ceiling of a house and serves as a strut between them, and a pillar provided at the upper and lower ends of the pillar. In a fall prevention device including a contact member , the contact member includes a long support portion extending laterally from a position supported by the support, and the support portion faces a ceiling or an object to be held. The surface forms a warp such that the surface rises obliquely toward the distal end side, and the support portion retains elasticity so that the opposing surface is along the ceiling or the held object when strutted by the column. Therefore, in the case of strut by the support, the contact member on the ceiling or the held object elastically bends to obtain a support effect, and even in the event of an earthquake, the elastic restoring force sufficiently attenuates vibration Can be absorbed. In addition, since a rigid member for preventing the warpage to the opposite side is provided at the end of the column in correspondence with the contact member, the elastic bending allowance is limited by the rigid member. As a result, warpage to the opposite side is prevented, excessive swinging of the held object can be suppressed, and reliable holding can be compensated.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which a fall prevention device is applied to a held object such as furniture in an embodiment according to the present invention.
FIG. 2 is a side view (A) and a bottom view (B) showing the first embodiment according to the present invention.
FIG. 3 is also a side view of a usage mode.
FIGS. 4A and 4B are longitudinal sectional side views (A) and (B) of a use mode showing a specific example of the fixing means according to the present invention.
FIG. 5 is also a cross-sectional plan view.
FIG. 6 is a side view showing a second embodiment of the present invention.
FIG. 7 is also a plan view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Prop 2, 3 Contact member 2A, 3A Support part 2B Upper surface 3B Lower surface 3C, 3D Contact part 3E Mounting hole 4, 5 Rigid member 6 Fixing means 6A Adjustment nut 6B Guide surface 61 Pin insertion hole 62 Pin through hole 63 Pin 7 Female screw piece 8 Elastic mechanism 9 Rubber sheet 14 Inner support member 14A Male screw 15 Outer support member 51, 52, 53, 54 Support member C Ceiling F Object to be held (furniture, etc.)

Claims

家具などの被保持物の頂部と家屋の天井との間に位置して、両者間に突っ張りの役目を果たす支柱、上記支柱の上下端に設けた当接部材を具備している転倒防止装置において、上記当接部材は上記支柱に支持される箇所よりも側方に延びる長い支持部を備えており、上記支持部は天井または被保持物との対向面が先端側に向けて斜めに上昇するような反りを形成しており、上記対向面が支柱による突っ張りの際に天井または被保持物に沿うように上記支持部に弾力性を保持させており、上記当接部材に対応して、反対側への反りを防止する剛性の部材を支柱の端部に装備していることを特徴とする転倒防止装置。In a fall prevention device including a strut positioned between the top of an object to be held such as furniture and a ceiling of a house and serving as a strut between the two, and contact members provided at upper and lower ends of the strut. The contact member has a long support portion extending laterally from a position supported by the support, and the support portion is inclined at a surface facing a ceiling or an object to be held toward a tip end side. Such a warp is formed, and the support surface is made to have elasticity so that the opposing surface is along the ceiling or the held object when the support surface is stretched by the support, and the opposing surface is opposed to the contact member. An overturn prevention device, characterized in that a rigid member for preventing warping to the side is provided at an end of a pillar .

上記剛性の部材は、支柱の端部の周面との間に間隙を有して支柱に装備されており、上記当接部材が天井または被保持物に弾性的に当接することにより上記剛性の部材が支柱の端部の周面に当接して反対側への反り返りを防止することを特徴とする請求項１記載の転倒防止装置。The rigid member is mounted on the column with a gap between the peripheral surface of the end of the column, and the rigid member is elastically contacted with the ceiling or the held object by the contact member. 2. The overturn prevention device according to claim 1, wherein the member abuts on a peripheral surface of an end portion of the pillar to prevent warping to the opposite side.

上記剛性の部材は、上記支持部の反りを受けとめる水平な平面を有した状態で支柱の端部に固着されることにより、当接部材の反対側への反りを防止することを特徴とする請求項１記載の転倒防止装置。The rigid member is fixed to an end of a column in a state where the rigid member has a horizontal plane that receives the warpage of the support portion, thereby preventing the contact member from warping to the opposite side. Item 4. The fall prevention device according to Item 1.

上記支柱は、互いに上下に嵌合する一対の支柱部材から構成されると共に、両支持部材を所要位置で互いに連結・固定する固定手段を装備しており、上記固定手段は、互いに嵌合する上記支柱部材の内、内側支柱部材の外周周面に雄ねじを形成し、両支柱部材の嵌合口において、外側支柱部材に回転可能に調整ナットを装備しており、上記調整ナット内には、上記内側支柱部材の押し込み方向にテーパーをなす複数の案内面を形成すると共に、上記調整ナットの回転と一緒に回転する状態で、上記案内面に対応して複数の雌ねじ駒を装備し、この雌ねじ駒を上記案内面に案内させて半径方向に移動して上記雄ねじに係脱するように構成してなり、上記調整ナット内に装備した弾持機構で、上記雌ねじ駒を外側支柱部材の方向に弾持していることを特徴とする請求項１〜３のいずれか１項に記載の転倒防止装置。 The strut is composed of a pair of strut members which are fitted up and down with each other, and is equipped with fixing means for connecting and fixing the two support members to each other at a required position. Of the support members, a male screw is formed on the outer peripheral surface of the inner support member, and at the fitting opening of both support members, an outer support member is equipped with a rotatable adjustment nut. While forming a plurality of guide surfaces tapering in the pushing direction of the support member, in a state of rotating together with the rotation of the adjustment nut, a plurality of female screw pieces are provided corresponding to the guide surfaces, and the female screw pieces are provided. It is configured to be guided in the guide surface and move in the radial direction to engage and disengage with the male screw. You are Overturning prevention device according to any one of claims 1 to 3, characterized in.