JP4112206B2

JP4112206B2 - Thumb turn

Info

Publication number: JP4112206B2
Application number: JP2001326537A
Authority: JP
Inventors: 章片山; 敏裕大島
Original assignee: 美和ロック株式会社
Priority date: 2001-10-24
Filing date: 2001-10-24
Publication date: 2008-07-02
Anticipated expiration: 2021-10-24
Also published as: JP2003129702A

Description

【０００１】
【発明の属する技術分野】
本発明は、扉などの開閉体に内蔵された錠箱機構部に対し回転による操作力を入力し、錠箱内に設けたロック部材を開閉体枠に対して進退動作させるサムターンに関するものである。
【０００２】
【従来の技術】
従来、サムターン付きの施錠装置は、扉などの開閉体に錠箱が内蔵され、錠箱には、開閉体の屋外側に露出するシリンダー錠と、開閉体の屋内側に露出する回転式のサムターンとが設けられている。
【０００３】
錠箱には、ロック部材である例えばデッドボルトが開閉体の端面（木口）から進退自在に設けられている。
この種の施錠装置では、屋外側に露出したシリンダー錠の鍵孔に、合鍵（キー）を挿入して回転操作することによって、開閉体の木口よりデッドボルトが進退され、建物躯体側の開閉体枠である開口枠体に設けたストライクに対して施解錠が行われるようになっている。
また、屋内側からは、サムターンの翼板状に形成される摘みが回転操作されるのみで、デッドボルトが進退され、開閉体の施解錠が簡便に行えるようになっている。
【０００４】
【発明が解決しようとする課題】
近年、マンションや住宅の玄関扉等の開閉体、あるいはこれら玄関扉等の開閉体近傍における開口枠体の周囲である壁部分に、高級感や優美性を高める目的で、ガラス板を嵌め込んだ小窓付のものが多用されるようになってきている。
ところが、このような開閉体の小窓や壁部分の小窓では、ガラス板が割られると、外部から、先端を鉤状に曲げた針金等を挿入して、サムターンが不正に操作されてしまう虞れがある。
【０００５】
一般的に、扉に多用される回転式のサムターンは、屋内側に露出する摘み部の翼板部に針金の鉤状先端を掛止し、回転モーメントを与えることにより不正な解錠操作が可能となる場合がある。
【０００６】
また、サムターンは、小窓の無い開閉体においても、針金を挿入する隙間や孔などが開閉体自体あるいは壁部分にあれば、同様に不正解錠される虞れがあった。
【０００７】
本発明は上記状況に鑑みてなされたもので、屋外側からの挿入等の不正な解錠を防止することのできるサムターンを提供し、もって、施錠装置の不正解錠防止機能の向上を図ることを目的とする。
【０００８】
【課題を解決するための手段】
次に、上記の課題を解決するための手段を、実施の形態に対応する図面を参照して説明する。
この発明のサムターン１は、表面３ａが、正面視で略正円形状とされるとともに、側面視で楕円形状の略半部状に形成される曲面よりなる略半球状に形成され、裏面３ｂが平坦に形成される摘み部３と、
前記摘み部３の平坦な裏面３ｂ中央に一端５ａが設けられ、該摘み部３と略一体に成形され、他端５ｂが錠箱機構部内に連結されて、該錠箱機構部に回動操作力を入力するサムターン軸５と、
後端部７ａが錠箱に固定され、扉面２０ａに穿設した挿入穴２１を貫通し、前記扉面２０ａに対して先端７ｂ側の半部が直交して突出し、前記サムターン軸５が貫通されて該サムターン軸５の中途部を回動自在に支持し、扉２０の屋内面２０ａ側に固設される筒状支持部７と、
前記摘み部３の外径と略同等の外径とされる球面部を備え一端（先端）１５ａに向けて小径となるテーパ面が形成されるとともに、他端が平坦な面に形成され、中央に前記サムターン軸５が貫通する穴部１６を備え、前記筒状支持部７における扉２０の屋内側先端７ｂと前記摘み部３の裏面３ｂとの間に、前記他端の平坦面と前記摘み部３の平坦な裏面３ｂとを対向させるとともに、前記一端１５ａ側を前記筒状支持部７に対向させて前記サムターン軸５の一端５ａ側の周囲を覆い、前記摘み部３の外形状とともに側面視で連続した略一体状の略球形状とされて、前記摘み部と前記筒状支持部との間で前記サムターン軸５に対し回動自在に配設されるカラー部１５と、
を具備することを特徴とする。
【０００９】
また、前記筒状支持部７には、前記扉２０の屋内面２０ａより突出する外周部分に、先端側を切除した略円錐状の化粧リング１１が先端部を前記筒状支持部７の先端側となるように配設されることを特徴とする。
【００１０】
このように構成されたサムターン１によれば、扉２０等に設けられた小窓を割り、或いは扉２０と扉枠の隙間から針金を差し入れることにより外部よりサムターン１を不正に操作しようとしても、サムターン１の形状が側面視で連続した略一体状の略球状であることから、その球面（表面３ａ）により針金の先端が摘み部３の先端側や周囲側に滑り、係止することが不可能となる。また、針金先端がサムターン軸５側に移動してもカラー部１５の球面部，テーパ面により係止することが不可能であり、かつカラー部１５が摘み部３と筒状支持部７との間でサムターン軸５に対して空転することから、針金の係止を不能とし、不正解錠を防止することができる。
そして、このサムターン１によれば、扉２０の屋内側からの施錠操作、及び解錠操作の際には、摘み部３とともにカラー部１５を掴み持ち、回転操作することでサムターン軸５を介し、錠箱機構部内を操作させてデッドボルトの進退操作を行い、建物躯体側の開閉体枠である開口枠体に設けたストライクに対して施解錠が行われる。この回転操作の際は、摘み部３とともにカラー部１５も回転することから、その操作に支障はない。
【００１１】
【発明の実施の形態】
図１は本発明によるサムターンの実施の形態を示す側断面図、図２は同サムターンの分解斜視図である。
【００１２】
扉２０には図示しない錠箱が設けられ、この錠箱にはラッチボルト、デッドボルト、及びこれらを扉の木口から進退させる錠箱機構部を内接している。扉２０は屋内側の面２０ａにサムターン１を備えている。上記した錠箱のデッドボルトは、扉２０の屋外側の面に設けたシリンダー錠をキーによって、又はこのサムターン１を回動することによって扉木口から進退可能となる。
【００１３】
本実施の形態のサムターン１は、摘み部３と、サムターン軸５と、筒状支持部７と、カラー部１５とで略構成される。
【００１４】
摘み部３は、表面３ａが略半球状に形成され、裏面３ｂが平坦に形成される。この摘み部３の表面３ａの形状を詳述すると、正面視で略正円形状とされるとともに、図１に示すように側面視で楕円形状の短軸側を略１／２、好ましくは１／２よりやや長尺とした略半部に形成される曲面よりなる。
【００１５】
サムターン軸５は、摘み部３の裏面３ｂ中央に一端５ａが設けられ、この摘み部３と略一体に成形され、略キノコ状に形成されている。また、サムターン軸５の他端５ｂは、例えば断面十字形状となって、図示しない錠箱機構部内の入力軸に相対回転不能に嵌入され連結される。
なお、このサムターン軸５の一端５ａは、軸本体よりやや大径な取付軸部６が形成される。
【００１６】
筒状支持部７は、略円筒形に形成され、後端部７ａに、軸線に直交方向の一対の凸部８を外周の上下に有し、これら凸部８に固定穴９が形成されている。筒状支持部７は、扉面２０ａに穿設した挿入穴２１に後端部７ａを挿入し、扉２０内に設けた図示しない錠箱にこの固定穴９を介して固定する。これにより、筒状支持部７は、錠箱に回動不能に固定され、この錠箱を介して扉２０の屋内面２０ａ側に固設されることになる。
【００１７】
扉面２０ａから突出する筒状支持部７の先端７ｂ側の略半部は、屋内面２０ａより突出し、その外周には、先端側を切除した略円錐状の化粧リング１１を、先端部が筒状支持部７の先端７ｂ側となるように取り付けている。
また、筒状支持部７の屋内側の先端７ｂには、飾り筒１３が設けられ、筒状支持部７先端面を覆うようになっている。
【００１８】
そしてこの筒状支持部７には、サムターン軸５が貫通するとともに、図示しないＥリングなどの移動規制部材が取り付けられ、サムターン軸５の筒状支持部７に対して抜脱を規制し、回動自在に支持している。なお、サムターン軸５は、筒状支持部７に取り付けられた状態で、一端の取付軸部６が筒状支持部７の先端７ｂより屋内側に突出した状態となり、すなわちこの取付軸部６が摘み部裏面３ｂと筒状支持部先端７ｂとの間に位置する。
【００１９】
カラー部１５は、摘み部３の外径と略同等の外径に形成され、すなわち正面視で略円形状とされ、また、側面視で略楕円形の略半部とされる曲面形状の球面部を備えるとともに、一端となる先端１５ａに向けて小径となるテーパ面が形成された略円錐形状に形成される。また、中央に穴部１６が貫通成形されている。この穴部１６は、サムターン軸５の取付軸部６に対応した内径とされている。
なお、カラー部１５の他端１５ｂ側は、平坦な面に形成される。
【００２０】
そして、このカラー部１５は、中央の穴部１６にサムターン軸５が貫通して、サムターン軸５の取付軸部６に配置される。カラー部１５は、他端１５ｂ側の平坦面と摘み部３の平坦な裏面３ｂとが対向し、先端１５ａ側のテーパ面が筒状支持部７に対向して、取付軸部６の周囲を覆うように取り付けられて、サムターン軸５に対して回動自在に配設される。サムターン軸５に配設されたカラー部１５は、摘み部３の外形状とともに、側面視で連続した略一体状の略球形状となる。
【００２１】
このような構成によるサムターン１によれば、扉２０の屋内側からの施錠操作、及び解錠操作の際には、摘み部３とともにカラー部１５を掴み持ち、回転操作することでサムターン軸５を介し、錠箱機構部内を操作させてデッドボルトの進退操作を行い、建物躯体側の開閉体枠である開口枠体に設けたストライクに対して施解錠が行われる。この回転操作の際は、摘み部３とともにカラー部１５も回転することから、その操作に支障はない。
【００２２】
そして、扉２０等に設けられた小窓を割り、或いは扉２０と扉枠の隙間から先端鉤状の針金を差し入れることにより施錠状態となっているサムターン１を不正に回転操作しようとしても、サムターン１の摘み部３の形状が、従来のような翼板形状ではなく、略球状に形成されていることから、その球面（表面３ａ）により針金の先端が摘み部３の先端側や周囲側に滑り、係止することが不可能となる。また、針金先端がサムターン軸５側に移動してもカラー部１５の球面部，テーパ面により係止することが不可能であり、かつカラー部１５がサムターン軸５に対して空転することから、針金の係止を不能とし、不正解錠を防止することができる。
【００２３】
なお、上述した実施の形態では、摘み部３の構成として、略半球状に形成し、これを掴み持ち回転操作する構成とされるが、施錠状態と解錠状態とを容易に視認できるように、屋内側となるサムターン表面３ａの一部に印刷や刻印などを施し、回転位置状態が判別できるように構成してもよい。
【００２４】
【発明の効果】
以上説明したように本発明によるサムターンでは、摘み部の表面形状を略半球状に形成し、摘み部と筒状支持部との間に、回動自在なカラー部を配設したので、扉等に設けられた小窓を割り、或いは扉と扉枠の隙間から針金を差し入れることによりサムターンを不正に操作しようとしても、サムターンの形状が側面視で連続した略一体状の略球状であることから、その球面により針金の先端が摘み部の先端側や周囲側に滑り、係止することが不可能となる。
また、針金先端がサムターン軸側に移動してもカラー部の球面部，テーパ面により係止することが不可能であり、かつカラー部が摘み部と筒状支持部との間でサムターン軸に対して空転することから、針金の係止を不能とし、不正解錠を防止することができる。
すなわち、解錠のための操作力を錠箱機構部に対し入力して解錠操作を行うことができない。これにより、針金を摘み部に引っ掛けることによって、サムターンを回動させる不正解錠を確実に防止することができ、施錠装置の不正解錠防止機能を向上させることができる。
そして、このサムターンによれば、扉の施錠操作、及び解錠操作の際には、摘み部とともにカラー部を掴み持ち、回転操作することでサムターン軸を介し、錠箱機構部内を操作させて施解錠が行われる。この回転操作の際は、摘み部とともにカラー部も回転することから、その操作に支障はない。
【図面の簡単な説明】
【図１】本発明によるサムターンの実施の形態を示す側断面図である。
【図２】同サムターンの分解斜視図である。
【符号の説明】
１…サムターン
３…摘み部
３ａ…表面
３ｂ…裏面
５…サムターン軸
５ａ…一端
７…筒状支持部
７ｂ…先端
１１…化粧リング
１５…カラー部
１５ａ…先端
１６…穴部
２０…扉
２０ａ…屋内面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thumb turn for inputting an operation force by rotation to a lock box mechanism portion built in an opening / closing body such as a door and causing a locking member provided in the lock box to move forward and backward with respect to the opening / closing body frame. .
[0002]
[Prior art]
Conventionally, a locking device with a thumb turn has a built-in lock box in an opening / closing body such as a door, and the lock box has a cylinder lock exposed on the outdoor side of the opening / closing body and a rotary thumb turn exposed on the indoor side of the opening / closing body. And are provided.
[0003]
The lock box is provided with, for example, a dead bolt, which is a lock member, so as to be able to advance and retreat from the end face (the end) of the opening / closing body.
In this type of locking device, the deadbolt is advanced and retracted from the top of the opening and closing body by inserting a key into the keyhole of the cylinder lock exposed to the outdoor side and rotating it. Locking / unlocking is performed on a strike provided in an opening frame body which is a frame.
Further, from the indoor side, the dead bolt is advanced and retracted by simply rotating the knob formed in the shape of the thumb-turn vane so that the opening and closing body can be easily locked and unlocked.
[0004]
[Problems to be solved by the invention]
In recent years, a glass plate has been fitted into the opening and closing bodies of condominiums and residential buildings, or the wall around the opening frame in the vicinity of the opening and closing bodies of these entrance doors for the purpose of enhancing luxury and grace. Things with small windows are increasingly used.
However, in such a small window of the opening / closing body and a small window of the wall portion, when the glass plate is broken, a thumb turn is inserted from the outside and the thumb turn is illegally operated. There is a fear.
[0005]
In general, the rotary thumb turn often used for doors can be illegally unlocked by hooking the hooked tip of the wire to the blade plate of the knob exposed on the indoor side and giving a rotational moment. It may become.
[0006]
Further, even in an opening / closing body without a small window, there is a possibility that the thumb turn may be illegally unlocked if there is a gap or a hole for inserting a wire in the opening / closing body or a wall portion.
[0007]
The present invention has been made in view of the above situation, and provides a thumb turn that can prevent unauthorized unlocking such as insertion from the outdoor side, thereby improving the unauthorized unlocking prevention function of the locking device. With the goal.
[0008]
[Means for Solving the Problems]
Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
In the thumb turn 1 of the present invention, the front surface 3a is formed in a substantially circular shape when viewed from the front, and is formed in a substantially hemispherical shape consisting of a curved surface formed in a substantially half shape of an elliptical shape when viewed from the side. A knob 3 formed flat,
One end 5a is provided at the center of the flat back surface 3b of the knob 3 and is formed substantially integrally with the knob 3, and the other end 5b is connected to the lock box mechanism, and the lock box mechanism is rotated. Thumb turn shaft 5 for inputting force,
The rear end portion 7a is fixed to the lock box, passes through the insertion hole 21 drilled in the door surface 20a, the half portion on the front end 7b side projects perpendicularly to the door surface 20a, and the thumb turn shaft 5 passes through. A cylindrical support portion 7 that rotatably supports the middle portion of the thumb turn shaft 5 and is fixed to the indoor surface 20a side of the door 20;
A tapered surface having a spherical portion having an outer diameter substantially equal to the outer diameter of the knob portion 3 and having a small diameter toward one end (tip) 15a is formed, and the other end is formed in a flat surface, A hole 16 through which the thumb turn shaft 5 passes, and the flat surface of the other end and the knob between the indoor-side tip 7b of the door 20 and the rear face 3b of the knob 3 in the cylindrical support portion 7. The flat back surface 3b of the part 3 is made to face, the one end 15a side is made to face the cylindrical support part 7, and the periphery of the thumb turn shaft 5 on the one end 5a side is covered. A collar portion 15 that is formed in a substantially spherical shape that is continuous and continuous with a view, and that is rotatably arranged with respect to the thumb turn shaft 5 between the knob portion and the cylindrical support portion;
It is characterized by comprising.
[0009]
Further, the cylindrical support portion 7 has a substantially conical decorative ring 11 having a distal end side cut off at an outer peripheral portion protruding from the indoor surface 20 a of the door 20. It arrange | positions so that it may become.
[0010]
According to the thumb turn 1 configured as described above, even if an attempt is made to illegally operate the thumb turn 1 from the outside by splitting a small window provided in the door 20 or the like or by inserting a wire through a gap between the door 20 and the door frame. Since the thumb turn 1 has a substantially integral and substantially spherical shape in a side view, the tip of the wire can be slid and locked to the tip side or the peripheral side of the knob 3 by the spherical surface (surface 3a). It becomes impossible. Further, even if the tip of the wire moves to the thumb turn shaft 5 side, it cannot be locked by the spherical surface or the tapered surface of the collar portion 15, and the collar portion 15 is formed between the knob portion 3 and the cylindrical support portion 7. Since it idles with respect to the thumb-turn shaft 5 in the meantime, it becomes impossible to lock the wire and prevent unauthorized unlocking.
And according to this thumb turn 1, in the case of the locking operation and the unlocking operation from the indoor side of the door 20, the collar portion 15 is grasped and held together with the knob portion 3, and is rotated via the thumb turn shaft 5, The inside of the lock box mechanism is operated to move the dead bolt forward and backward, and locking and unlocking are performed on the strike provided on the opening frame body that is the opening / closing body frame on the building housing side. During this rotation operation, the collar portion 15 is rotated together with the knob 3, so that there is no problem in the operation.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side sectional view showing an embodiment of a thumb turn according to the present invention, and FIG. 2 is an exploded perspective view of the thumb turn.
[0012]
The door 20 is provided with a lock box (not shown). The lock box is inscribed with a latch bolt, a dead bolt, and a lock box mechanism for moving the door forward and backward from the door mouth. The door 20 has a thumb turn 1 on an indoor side surface 20a. The above-described dead bolt of the lock box can be advanced and retracted from the door mouth by rotating the thumb lock 1 with a key of the cylinder lock provided on the outdoor side surface of the door 20.
[0013]
The thumb turn 1 of the present embodiment is substantially constituted by a knob portion 3, a thumb turn shaft 5, a cylindrical support portion 7, and a collar portion 15.
[0014]
As for the knob | pick part 3, the surface 3a is formed in a substantially hemispherical shape, and the back surface 3b is formed flat. The shape of the surface 3a of the knob portion 3 will be described in detail. The shape of the surface 3a is a substantially circular shape when viewed from the front, and the short axis side of the elliptical shape is approximately 1/2, preferably 1 when viewed from the side as shown in FIG. It consists of a curved surface formed in a substantially half part that is slightly longer than / 2.
[0015]
The thumb turn shaft 5 is provided with one end 5a at the center of the back surface 3b of the knob 3, and is formed substantially integrally with the knob 3 and is formed in a substantially mushroom shape. The other end 5b of the thumb turn shaft 5 has, for example, a cross shape in cross section, and is fitted and connected to an input shaft in a lock box mechanism (not shown) so as not to be relatively rotatable.
In addition, the one end 5a of the thumb turn shaft 5 is formed with an attachment shaft portion 6 having a slightly larger diameter than the shaft main body.
[0016]
The cylindrical support portion 7 is formed in a substantially cylindrical shape, and has a pair of convex portions 8 perpendicular to the axis at the rear end portion 7a on the upper and lower sides of the outer periphery, and fixing holes 9 are formed in these convex portions 8. Yes. The cylindrical support portion 7 is inserted into the insertion hole 21 formed in the door surface 20 a by inserting the rear end portion 7 a and fixed to a lock box (not shown) provided in the door 20 through the fixing hole 9. Thereby, the cylindrical support part 7 is fixed to the lock box so as not to rotate, and is fixed to the indoor surface 20a side of the door 20 via the lock box.
[0017]
A substantially half portion on the tip 7b side of the cylindrical support portion 7 protruding from the door surface 20a protrudes from the indoor surface 20a, and a substantially conical decorative ring 11 with the tip side cut off is provided on the outer periphery thereof. It attaches so that it may become the front-end | tip 7b side of the shape support part 7. FIG.
A decorative cylinder 13 is provided at the indoor-side tip 7 b of the cylindrical support portion 7 so as to cover the tip surface of the cylindrical support portion 7.
[0018]
Then, the thumb support shaft 7 penetrates the thumb turn shaft 5 and a movement restricting member such as an E-ring (not shown) is attached to the tubular support portion 7 so as to prevent the thumb turn shaft 5 from being removed. Supports freely. The thumb turn shaft 5 is attached to the cylindrical support portion 7, and the attachment shaft portion 6 at one end protrudes indoors from the tip 7b of the cylindrical support portion 7, that is, the attachment shaft portion 6 is It is located between the knob part back surface 3b and the cylindrical support part tip 7b.
[0019]
The collar portion 15 is formed to have an outer diameter substantially equal to the outer diameter of the knob portion 3, that is, a substantially spherical surface having a substantially circular shape in a front view and a substantially half portion in a substantially oval shape in a side view. And a substantially conical shape having a tapered surface with a small diameter toward the tip 15a as one end. In addition, a hole 16 is formed through the center. The hole portion 16 has an inner diameter corresponding to the mounting shaft portion 6 of the thumb turn shaft 5.
The other end 15b side of the collar portion 15 is formed on a flat surface.
[0020]
The collar portion 15 is disposed on the mounting shaft portion 6 of the thumb turn shaft 5 with the thumb turn shaft 5 passing through the central hole portion 16. In the collar portion 15, the flat surface on the other end 15 b side and the flat back surface 3 b of the knob portion 3 face each other, and the tapered surface on the tip 15 a side faces the cylindrical support portion 7, so that the periphery of the mounting shaft portion 6 is It is attached so as to cover and is arranged so as to be rotatable with respect to the thumb turn shaft 5. The collar portion 15 disposed on the thumb turn shaft 5 has an approximately spherical shape that is continuous in a side view, together with the outer shape of the knob portion 3.
[0021]
According to the thumb turn 1 having such a configuration, when the door 20 is locked and unlocked from the indoor side, the thumb turn 3 is held by holding the collar portion 15 together with the knob 3 and rotating it. Then, the inside of the lock box mechanism is operated to move the dead bolt forward and backward, and locking and unlocking are performed on the strike provided on the opening frame body which is the opening / closing body frame on the building skeleton side. During this rotation operation, the collar portion 15 is rotated together with the knob 3, so that there is no problem in the operation.
[0022]
And even if you try to rotate the thumb turn 1 that is locked by illegally splitting the small window provided in the door 20 or the like or inserting a hook-shaped wire through the gap between the door 20 and the door frame, Since the shape of the knob portion 3 of the thumb turn 1 is not a conventional wing plate shape, but is formed in a substantially spherical shape, the tip of the wire is at the tip side or the peripheral side of the knob portion 3 by the spherical surface (surface 3a). It becomes impossible to slide and lock. Further, even if the tip of the wire moves to the thumb turn shaft 5 side, it cannot be locked by the spherical surface portion or the taper surface of the collar portion 15, and the collar portion 15 idles with respect to the thumb turn shaft 5. The locking of the wire is disabled, and unauthorized unlocking can be prevented.
[0023]
In the above-described embodiment, the knob 3 is configured to have a substantially hemispherical shape and is configured to be gripped and rotated, so that the locked state and the unlocked state can be easily recognized. A part of the thumb turn surface 3a on the indoor side may be printed or engraved so that the rotational position state can be determined.
[0024]
【The invention's effect】
As described above, in the thumb turn according to the present invention, the surface shape of the knob portion is formed in a substantially hemispherical shape, and the rotatable collar portion is disposed between the knob portion and the cylindrical support portion. If the thumb turn is illegally operated by splitting a small window provided in the door or inserting a wire through the gap between the door and the door frame, the thumb turn has a substantially integral, substantially spherical shape in side view. Therefore, the spherical surface makes it impossible for the tip of the wire to slide and lock to the tip side or the peripheral side of the knob.
In addition, even if the tip of the wire moves to the thumb turn shaft side, it cannot be locked by the spherical surface and the tapered surface of the collar portion, and the collar portion is attached to the thumb turn shaft between the knob portion and the cylindrical support portion. On the other hand, since it idles, it becomes impossible to lock the wire and prevent unauthorized unlocking.
That is, the unlocking operation cannot be performed by inputting an operation force for unlocking to the lock box mechanism. Thereby, by hooking the wire on the knob, the unauthorized unlocking of rotating the thumb turn can be reliably prevented, and the unauthorized unlocking prevention function of the locking device can be improved.
And according to this thumb turn, when the door is locked and unlocked, the collar portion is grasped and held together with the knob, and the inside of the lock box mechanism is operated via the thumb turn shaft by rotating the handle. The lock is done. In this rotation operation, the collar portion is rotated together with the knob portion, so that the operation is not hindered.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an embodiment of a thumb turn according to the present invention.
FIG. 2 is an exploded perspective view of the thumb turn.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Thumb turn 3 ... Pick part 3a ... Front surface 3b ... Back surface 5 ... Thumb turn shaft 5a ... One end 7 ... Cylindrical support part 7b ... Tip 11 ... Cosmetic ring 15 ... Collar part 15a ... Tip 16 ... Hole 20 ... Door 20a ... Indoor surface

Claims

The surface has a substantially circular shape when viewed from the front, and is formed into a substantially hemispherical shape formed of a curved surface formed into an approximately half of an elliptical shape when viewed from the side, and a knob having a back surface formed flat ,
A thumb turn provided with one end at the center of the flat back surface of the knob , formed substantially integrally with the knob , and connected to the other end in the lock box mechanism, and inputs a rotational operation force to the lock box mechanism. The axis,
The rear end portion is fixed to the lock box, passes through the insertion hole drilled in the door surface, the front half of the door surface projects perpendicularly to the door surface, and the thumb turn shaft passes through the thumb turn shaft. A cylindrical support part that rotatably supports the midway part and is fixed to the indoor surface side of the door,
Together with the tapered surface whose diameter toward one end an outer diameter and a spherical surface portion which is an outer diameter substantially equal to the knob portion is formed, the other end is formed on a flat surface, the in central thumb-axis Is provided with a through-hole, and between the front end on the indoor side of the door in the cylindrical support portion and the back surface of the knob portion, the flat surface of the other end and the flat back surface of the knob portion are opposed to each other, wherein one end side is opposed to the cylindrical support portion covers the circumference of one end of the thumb-turn shaft, is substantially integral shaped substantially spherical continuous in a side view with the outer shape of the knob, the knob A collar portion disposed so as to be rotatable with respect to the thumb turn shaft between a portion and the cylindrical support portion ;
A thumb turn characterized by comprising:

The cylindrical support portion is provided with a substantially conical decorative ring with the tip side cut off on the outer peripheral portion protruding from the indoor surface of the door so that the tip portion is the tip side of the cylindrical support portion. The thumb turn according to claim 1, wherein: