JP3490200B2 - Pivot bearing device for center suspension - Google Patents

Description

【発明の詳細な説明】 【０００１】 【発明が属する技術分野】本発明は、扉枠上辺部に備え
るピボット軸受装置に上部を軸支されるピボット軸の下
部を軸支する，扉上端の凹部に備えられる中心吊用ピボ
ット軸受装置に関する。 【０００２】 【従来の技術】実公昭６１−４６１３８号に示すピボッ
トヒンジのピボット位置調整装置は、扉上端の凹部に備
えられるピボット軸受装置の調整ねじを螺動して軸受に
穿設された軸孔を扉幅方向に調整して扉側端面と扉枠縦
辺部との隙間を調整することができる。 【０００３】 【発明が解決しようとする課題】しかしながら、実公昭
６１−４６１３８号には以下の問題点があった。 扉上端の凹部に備えられるピボット軸受装置の調整ネ
ジは回動自在であり回り止めがないので、長期間経過す
ると、扉の自重に起因するモーメント作用による推力の
ため、扉枠上辺部に備えるピボット軸受装置の調整ネジ
が回転してしまい、扉枠上辺部に備えるピボット軸受装
置のピボット軸を軸支する軸孔に対して扉上端の凹部に
備えられるピボット軸受装置のピボット軸を軸支する軸
孔が扉開閉端側へずれてしまい、このため、軋み音が発
生し、さらにずれが大きくなると扉が扉枠に干渉し扉の
開閉が円滑に行えなくなる。 上記のように、問題に対しては、調整ネジのネジ山
部分に樹脂等を付着させ、回転しにくくさせる方法があ
るが、雄ネジ、雌ネジ間のクリアランスと付着させた樹
脂の膜厚を計算する必要があり、ネジの加工精度管理や
樹脂の膜厚管理等が必要となり、管理が面倒である。
（クリアランスに対して膜厚が厚ければ回転トルクが大
きくなり効果的であるが、調整が困難であり、その反対
に膜厚が薄ければ回転トルクは小さくなり調整は簡単で
あるが、効果が落ちる。） 【０００４】本発明は、扉枠上辺部に備えるピボット軸
受装置に上半部を軸支されるピボット軸の下半部を軸支
する，扉上端の凹部に備えられる中心吊用ピボット軸受
装置であって、調整ネジを調整のために回動した後は回
動不能にすることができ上記の問題点を解消できる，扉
上端の凹部に備えられる中心吊用ピボット軸受装置を提
供すること目的としている。 【０００５】 【課題を解決するための手段】本発明は、上記の課題を
解決するための手段として、扉Ｄ上端の凹部Ｄ1 へ固定
される軸受ガイド４を備え、該軸受ガイド４に、ピボッ
ト軸２の下部２ｂを軸支し得る軸孔３ａ及び扉幅方向に
螺孔されたネジ孔３ｂを有する軸受３を扉幅方向に摺動
可能に収嵌するとともに扉幅方向に穿設された貫通孔５
ａを有するネジ頭部支持台５を収嵌し、調整ネジ６の雄
ネジ部６ａを前記軸受３のネジ孔３ｂに螺合しかつネジ
頭部６ｂを前記貫通孔５ａ内に収嵌し、固定ネジ７を前
記軸受ガイド４の両側の側面に穿設した孔４ｃ，４ｃに
通して前記ネジ頭部支持台５の両側の側面より前記貫通
孔５ａに連通して螺設されたネジ孔５ｂ，５ｂに螺合し
先端部７ａを前記調整ネジ６のネジ頭部６ｂに刻設され
た周溝６ｃに嵌入してなる中心吊用ピボット軸受装置に
おいて、前記ネジ頭部支持台５の上面より前記貫通孔５
ａに僅かに連通してすれ違うように螺孔したネジ孔５ｃ
に螺合して前記調整ネジ６のネジ頭部６ｂにすれ違う部
分で干渉して前記調整ネジ６を螺回不能にする回り止め
ネジ１２を付設したことを特徴とする中心吊用ピボット
軸受装置を提供するものである。好ましくは本発明は、
前記調整ネジ６のネジ頭部６ｂの前記回り止めネジ１２
が干渉する箇所の周面を凹凸面となるように形成した中
心吊用ピボット軸受装置を提供するものである。 【０００６】 【発明の実施の形態】本発明の中心吊用ピボット軸受装
置の実施の形態を図１(a),(b),(c),(d),(e)を参照して
説明する。この中心吊用ピボット軸受装置は、扉枠Ｗ上
辺部に備えるピボット軸装置１に上部２ａを軸支される
ピボット軸２の下方へ突出する下部２ｂを軸支する，扉
Ｄ上端の凹部Ｄ1 に備えられるピボット軸受装置であ
る。 【０００７】この実施の形態では、軸受ガイド４に軸受
３とネジ頭部支持台５を収嵌し、調整ネジ６の雄ネジ部
６ａを軸受３のネジ孔３ｂに螺合しかつネジ頭部６ｂを
ネジ頭部支持台５の貫通孔５ａ内に収嵌し、固定ネジ７
でネジ頭部支持台５を固定しかつ調整ネジ６を移動不能
にした中心吊用ピボット軸受装置において、ネジ頭部支
持台５の上面より貫通孔５ａに僅かに連通してすれ違う
ように螺孔したネジ孔５ｃに螺合して調整ネジ６のネジ
頭部６ｂにすれ違う部分で干渉して前記調整ネジ６を螺
回不能にする回り止めネジ１２を付設した。 【０００８】軸受３は、ピボット軸２の下部２ｂを収嵌
して軸支し得る軸孔３ａと該軸孔３ａの扉開閉端側に直
交して貫通するように扉幅方向に螺孔されたネジ孔３ｂ
を有する。 【０００９】軸受ガイド４は、中途がＣ型チャンネル形
状で全体が概略チャンネル形状であり、溝方向を扉幅方
向に合致して底面部４ａを扉Ｄ上端の凹部Ｄ1 にネジ１
３で固定した取付け台１４に載置して底面部４ａに穿設
した孔４ｂ，４ｂ，４ｂに通すネジ１０で締付固定され
る。軸受３は、軸受ガイド４をネジ１０により締付固定
した後に、軸受ガイド４の溝内に側方から嵌入され上下
左右方向のガタツキがなく嵌入方向（＝扉幅方向）に摺
動可能である。 【００１０】ネジ頭部支持台５は、軸受ガイド４の溝内
に軸受３に対して扉開閉端側に収嵌されていて、軸受３
のネジ孔３ｂと同芯状にネジ孔３ｂよりも大きい貫通孔
５ａが扉幅方向に穿設されている。 【００１１】図１(b),(d) に示すように、調整ネジ６
は、雄ネジ部６ａをネジ頭部支持台５の貫通孔５ａに挿
通して軸受３のネジ孔３ｂに螺合しネジ頭部６ｂが貫通
孔５ａ内にガタツキなく収嵌されている。 【００１２】図１(b),(d) に示すように、固定ネジ７
は、軸受ガイド４の両側の側面に穿設した孔４ｃ，４ｃ
を通してネジ頭部支持台５の両側の側面に螺孔したネジ
孔５ｂ，５ｂに螺合してネジ頭部支持台５を固定すると
ともに調整ネジ６のネジ頭部６ｂの中途に刻設した周溝
６ｃに嵌入して前記調整ネジ６のネジ回しを確保しかつ
扉幅方向の移動を拘束する役目を果たしている。 【００１３】図１(e) に示すように、回り止めネジ１２
は、ネジ頭部支持台５の上面より貫通孔５ａに僅かに連
通してすれ違うように螺孔したネジ孔５ｃに途中まで螺
合して調整ネジ６を調整した後に調整ネジ６のネジ頭部
６ｂとすれ違う部分で該ネジ頭部６ｂに干渉して調整ネ
ジ６の螺動を不能にする役目を果たしている。本発明
は、回り止めネジ１２を調整ネジ６のネジ頭部６ｂの軸
線に直交するように設けるときは、ネジ孔５ｃ及び回り
止めネジ１２を長く確保できず、十分な締付固定が得ら
れないとともに、回り止めネジ１２がネジ頭部支持台５
の上面より突出してしまい、従って、扉Ｄ上端の凹部Ｄ
1 から突出してしまう不都合がある。本発明は、回り止
めネジ１２と調整ネジ６のネジ頭部６ｂとがすれ違う部
分で干渉するようにしたので、ネジ孔５ｃを十分に長く
螺孔することができるとともに、回り止めネジ１２とし
て長いネジを使用できネジ頭部支持台５の上面より引っ
込むまでねじ込むことができるから、回り止めネジ１２
で調整ネジ６を確実に螺動不能にできる。回り止めネジ
１２と調整ネジ６のネジ頭部６ｂとをすれ違う部分で確
実に干渉して調整ネジ６を螺動不能にするために、ネジ
頭部６ｂの周面にローレット加工等により凹凸を形成す
ることが好ましい。この他、回り止めネジ１２と調整ネ
ジ６のネジ頭部６ｂとをすれ違う部分で確実に干渉して
調整ネジ６を螺動不能にするために、調整ネジ６を比較
的軟らかい金属材料で製作する一方、回り止めネジ１２
を熱処理を施す等の固い金属材料で製作して、調整ネジ
６のネジ頭部６ｂの回り止めネジ１２と干渉する部分に
大きな塑性変形を起こさせて調整ネジ６を螺動不能にし
ても良い。 【００１４】本発明の中心吊用ピボット軸受装置によれ
ば、回り止めネジ１２をネジ孔５ｃに螺合しないで（も
しくは調整ネジ６のネジ頭部６ｂと干渉しないように回
り止めネジ１２をネジ孔５ｃに螺合しておいて）扉Ｄの
建て込みを行い、扉側端面と扉枠縦辺部との隙間を調
べ、隙間調整の必要があるときは、調整ネジ６のネジ頭
部６ｂにドライバー（ネジ回し工具）を係合して回して
軸受３を扉吊元側方向または扉開閉端側方向に調整する
ことにより、扉側端面と扉枠縦辺部との隙間を調整す
る。しかる後、回り止めネジ１２をねじ込んで調整ネジ
６のネジ頭部６ｂに干渉させて調整ネジ６を螺動不能に
する。 【００１５】軸受ガイド４は、軸受３をガタツキなく扉
幅方向に摺動可能に収嵌できてかつピボット軸２を軸孔
３ａに嵌挿しうるように開かれていて軸受３を調整移動
してもピボット軸２に干渉しない形状であれば良く、全
体がＣ型チャンネル形状であっても良いし、扉Ｄ上端の
凹部Ｄ1 内に収まる偏平な角筒形状であっても良い。軸
受ガイド４は、取付け台１４を介さずに底面部４ａをネ
ジ１０により扉Ｄ上端の凹部Ｄ1 へ直接締付固定するよ
うになっていても良い。 【００１６】 【発明の効果】以上説明してきたように、本発明の中心
吊用ピボット軸受装置によれば、調整ネジ６のネジ頭部
６ｂにすれ違う部分で干渉して調整ネジ６を螺回不能に
する回り止めネジ１２を付設したので、調整ネジ６を回
動調整した後に回り止めネジ１２を締め付けることによ
り調整ネジ６を回動不能にすることができるので、長期
間経過してもピボット軸と軸受の軸孔との間に芯ずれが
生ずるのを回避でき、扉の開閉時に軋み音が発生するの
を回避でき、扉も円滑な開閉を保障できる。また、調整
ネジ６のネジ頭部６ｂの周面に凹凸を形成した実施の形
態に係る中心吊用ピボット軸受装置によれば、回り止め
ネジ１２の調整ネジ６のネジ頭部６ｂに対する効果的な
干渉が確保できる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recess at the upper end of a door which pivotally supports a lower portion of a pivot shaft which is pivotally supported at an upper portion by a pivot bearing device provided at an upper side portion of a door frame. The present invention relates to a center suspension pivot bearing device provided in a vehicle. 2. Description of the Related Art A pivot position adjusting device for a pivot hinge disclosed in Japanese Utility Model Publication No. 61-46138 is a shaft formed in a bearing by screwing an adjusting screw of a pivot bearing device provided in a recess at an upper end of a door. By adjusting the hole in the door width direction, the gap between the door-side end surface and the door frame vertical side can be adjusted. However, Japanese Utility Model Publication No. 61-46138 has the following problems. The adjusting screw of the pivot bearing device provided in the recess at the upper end of the door is rotatable and does not stop, so after a long period of time, the pivot provided on the upper side of the door frame due to the thrust by the moment action caused by the weight of the door An adjustment screw of the bearing device is rotated, and a shaft that supports the pivot shaft of the pivot bearing device that is provided in the recess at the upper end of the door with respect to a shaft hole that supports the pivot shaft of the pivot bearing device provided on the upper side of the door frame. The hole is shifted toward the door opening / closing end side, so that a squeak noise is generated. If the gap is further increased, the door interferes with the door frame and the door cannot be opened and closed smoothly. As described above, to solve the problem, there is a method of attaching resin or the like to the thread portion of the adjustment screw to make it difficult to rotate, but the clearance between the male screw and the female screw and the thickness of the attached resin are reduced. It is necessary to calculate, and it is necessary to manage the processing accuracy of the screw and the thickness of the resin, which is troublesome.
(If the film thickness is large with respect to the clearance, the rotation torque increases and the rotation torque is effective, but it is difficult to adjust. On the contrary, if the film thickness is small, the rotation torque decreases and the adjustment is simple, but the effect is small. According to the present invention, a center suspension provided in a recess at an upper end of a door, which supports a lower half of a pivot shaft whose upper half is supported by a pivot bearing device provided on an upper side of a door frame. Provided is a pivot bearing device provided in a concave portion at the upper end of a door, wherein the pivot screw device cannot be rotated after the adjusting screw is rotated for adjustment, and can solve the above-mentioned problem. The purpose is to According to the present invention, as a means for solving the above-mentioned problems, a bearing guide 4 fixed to a concave portion D1 at the upper end of a door D is provided. A bearing 3 having a shaft hole 3a capable of pivotally supporting the lower portion 2b of the shaft 2 and a screw hole 3b screwed in the door width direction is slidably fitted in the door width direction and is bored in the door width direction. Through hole 5
a screw head support base 5 having a, a male screw portion 6a of the adjusting screw 6 is screwed into the screw hole 3b of the bearing 3, and the screw head 6b is fitted in the through hole 5a. A screw hole 5b is formed by passing a fixing screw 7 through holes 4c, 4c formed in both side surfaces of the bearing guide 4 and communicating with the through hole 5a from both side surfaces of the screw head support base 5. , 5b, and the tip 7a is fitted into a circumferential groove 6c formed in the screw head 6b of the adjusting screw 6. In the center suspension pivot bearing device, The through hole 5
a threaded screw hole 5c which is slightly connected to
A pivoting bearing device for center suspension, which is provided with a detent screw 12 for screwing into the screw head 6b of the adjusting screw 6 so as to interfere with the screw head 6b so that the adjusting screw 6 cannot be screwed. To provide. Preferably, the present invention provides
The detent screw 12 of the screw head 6b of the adjusting screw 6
The present invention provides a center suspension pivot bearing device in which a peripheral surface of a portion where the interference occurs is formed as an uneven surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a center suspension pivot bearing device according to the present invention will be described with reference to FIGS. 1 (a), 1 (b), 1 (c), 1 (d) and 1 (e). I do. This pivot bearing device for center suspension has a concave portion D1 at the upper end of a door D, which supports a lower portion 2b projecting below a pivot shaft 2 which is supported on an upper portion 2a by a pivot shaft device 1 provided on an upper side portion of a door frame W. It is a pivot bearing device provided. In this embodiment, the bearing 3 and the screw head support base 5 are fitted into the bearing guide 4, the male screw portion 6a of the adjusting screw 6 is screwed into the screw hole 3b of the bearing 3, and the screw head is screwed. 6b is fitted into the through hole 5a of the screw head support 5 and the fixing screw 7
In the center suspension pivot bearing device in which the screw head support base 5 is fixed and the adjustment screw 6 is immovable, the screw holes are slightly communicated from the upper surface of the screw head support base 5 to the through holes 5a so as to pass each other. A screw 12 is screwed into the screw hole 5c and interferes with the screw head 6b of the adjusting screw 6 at a portion passing therethrough to prevent the adjusting screw 6 from being screwed. The bearing 3 is screwed in the door width direction so as to fit in the lower part 2b of the pivot shaft 2 and to support the same, and to penetrate at right angles to the door opening / closing end side of the shaft hole 3a. Screw hole 3b
Having. The bearing guide 4 has a C-shaped channel shape in the middle and a substantially channel shape as a whole. The groove direction matches the door width direction, and the bottom surface 4a is screwed into the concave portion D1 at the upper end of the door D.
It is mounted on the mounting base 14 fixed by 3 and fastened and fixed by screws 10 passing through holes 4b, 4b, 4b formed in the bottom surface 4a. After tightening and fixing the bearing guide 4 with the screw 10, the bearing 3 is fitted into the groove of the bearing guide 4 from the side and can slide in the fitting direction (= door width direction) without rattling in the vertical and horizontal directions. . The screw head support base 5 is fitted in the groove of the bearing guide 4 on the door opening / closing end side with respect to the bearing 3, and
A through hole 5a larger than the screw hole 3b is formed in the door width direction concentrically with the screw hole 3b. As shown in FIGS. 1B and 1D, the adjusting screw 6
The male screw portion 6a is inserted into the through hole 5a of the screw head support base 5 and screwed into the screw hole 3b of the bearing 3, and the screw head 6b is fitted into the through hole 5a without looseness. As shown in FIGS. 1B and 1D, the fixing screw 7
Are holes 4c, 4c formed on both side surfaces of the bearing guide 4.
The screw head 5 is screwed into screw holes 5b, 5b screwed on both side surfaces of the screw head support 5 to fix the screw head support 5 and to a center of the adjustment screw 6 engraved in the middle of the screw head 6b. The adjustment screw 6 is fitted into the groove 6c to secure the screwdriver and to restrict the movement in the door width direction. [0013] As shown in FIG.
The screw head of the adjusting screw 6 is adjusted by adjusting the adjusting screw 6 by screwing it halfway into the screw hole 5c which is slightly communicated with the through hole 5a from the upper surface of the screw head supporting base 5 and screwed so as to pass each other. The portion passing by 6b interferes with the screw head 6b and serves to disable the adjustment screw 6 from being screwed. According to the present invention, when the detent screw 12 is provided so as to be orthogonal to the axis of the screw head 6b of the adjusting screw 6, the screw hole 5c and the detent screw 12 cannot be secured long, and sufficient tightening and fixing can be obtained. And the detent screw 12 is not
From the upper surface of the door D.
There is an inconvenience of protruding from 1. According to the present invention, since the detent screw 12 and the screw head 6b of the adjusting screw 6 interfere with each other at a point where they pass each other, the screw hole 5c can be screwed sufficiently long. Since a screw can be used and can be screwed in until it is retracted from the upper surface of the screw head support 5, the detent screw 12
As a result, the adjusting screw 6 can be reliably made unscrewable. Unevenness is formed on the peripheral surface of the screw head 6b by knurling or the like to ensure that the rotation preventing screw 12 and the screw head 6b of the adjusting screw 6 interfere with each other at a portion where they pass each other and make the adjusting screw 6 unscrewable. Is preferred. In addition, the adjusting screw 6 is made of a relatively soft metal material so that the locking screw 12 and the screw head 6b of the adjusting screw 6 reliably interfere with each other at a portion where they pass each other and the adjusting screw 6 cannot be screwed. On the other hand, the detent screw 12
May be made of a hard metal material such as heat-treated, and a large plastic deformation may be caused in a portion of the screw head 6b of the adjusting screw 6 that interferes with the detent screw 12, so that the adjusting screw 6 cannot be screwed. . According to the center suspension pivot bearing device of the present invention, the detent screw 12 is not screwed into the screw hole 5c (or the detent screw 12 is screwed so as not to interfere with the screw head 6b of the adjusting screw 6). The door D is erected (it is screwed into the hole 5c), the gap between the door-side end face and the vertical side of the door frame is checked, and when the gap needs to be adjusted, the screw head 6b of the adjusting screw 6 The gap between the door-side end face and the vertical side of the door frame is adjusted by adjusting the bearing 3 in the direction of the door hanging side or in the direction of the door opening / closing end by engaging and turning a screwdriver (screw tool) on the door. Thereafter, the detent screw 12 is screwed into the screw head 6b of the adjusting screw 6 so that the adjusting screw 6 cannot be screwed. The bearing guide 4 is open so that the bearing 3 can be slidably fitted in the door width direction without rattling and the pivot shaft 2 is opened so that the pivot shaft 2 can be inserted into the shaft hole 3a. Any shape may be used as long as it does not interfere with the pivot shaft 2, and the entire shape may be a C-shaped channel shape or a flat rectangular tube shape that fits in the concave portion D1 at the upper end of the door D. The bearing guide 4 may be configured such that the bottom surface portion 4a is directly tightened and fixed to the concave portion D1 at the upper end of the door D by the screw 10 without passing through the mounting base 14. As described above, according to the center suspension pivot bearing device of the present invention, the adjusting screw 6 cannot be screwed because it interferes with the screw head 6b of the adjusting screw 6 at a portion passing by. The rotation of the adjusting screw 6 can be disabled by rotating the adjusting screw 6 and then tightening the detent screw 12, so that the pivot screw can be disabled even after a long period of time. It is possible to avoid the occurrence of misalignment between the shaft and the shaft hole of the bearing, to avoid the generation of squeaking noise when the door is opened and closed, and to ensure the smooth opening and closing of the door. In addition, according to the center suspension pivot bearing device according to the embodiment in which the peripheral surface of the screw head 6b of the adjusting screw 6 is formed with irregularities, the detent screw 12 is effective for the adjusting screw 6 with respect to the screw head 6b. Interference can be secured.

【図面の簡単な説明】 【図１】本発明の中心吊用ピボット軸受装置の実施の形
態に係り、（ａ）は平面図、（ｂ）は図１（ａ）におけ
るＢ−Ｂ断面図、（ｃ）は図１（ｂ）におけるＣ−Ｃ矢
視図、（ｄ）は図１（ｂ）におけるＤ−Ｄ断面図、
（ｅ）は図１（ａ）におけるＥ−Ｅ断面図。 【符号の説明】 Ｄ ・・・扉 Ｄ1 ・・・凹部 ２ ・・・ピボット軸 ２ｂ ・・・ピボット軸の下半部 ３ ・・・軸孔 ３ａ ・・・軸孔 ３ｂ ・・・ネジ孔 ４ ・・・軸受ガイド ４ｃ ・・・孔 ５ ・・・ネジ頭部支持台 ５ａ ・・・貫通孔 ５ｂ ・・・ネジ孔 ５ｃ ・・・ネジ孔 ６ ・・・調整ネジ ６ａ ・・・雄ネジ部 ６ｂ ・・・ネジ頭部 ６ｃ ・・・周溝 ７ ・・・固定ネジ ７ａ ・・・先端部 １２ ・・・回り止めネジBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 relates to an embodiment of a center suspension pivot bearing device of the present invention, wherein (a) is a plan view, (b) is a cross-sectional view taken along the line BB in FIG. 1 (a), (C) is a view taken along the line CC in FIG. 1 (b), (d) is a sectional view taken along the line DD in FIG. 1 (b),
(E) is an EE cross-sectional view in FIG. 1 (a). [Description of Signs] D ··· Door D1 ··· Recess 2 ··· Pivot shaft 2b ··· Lower half 3 of pivot shaft ··· Shaft hole 3a ··· Shaft hole 3b ··· Screw hole 4 ... Bearing guide 4c ... Hole 5 ... Screw head support base 5a ... Through hole 5b ... Screw hole 5c ... Screw hole 6 ... Adjustment screw 6a ... Male screw part 6b ... screw head 6c ... circumferential groove 7 ... fixing screw 7a ... tip 12 ... detent screw

Claims (1)

(57)【特許請求の範囲】 【請求項１】 扉上端の凹部へ固定される軸受ガイドを
備え、該軸受ガイドに、ピボット軸の下部を軸支し得る
軸孔及び扉幅方向に螺孔されたネジ孔を有する軸受を扉
幅方向に摺動可能に収嵌するとともに扉幅方向に穿設さ
れた貫通孔を有するネジ頭部支持台を収嵌し、調整ネジ
の雄ネジ部を前記軸受のネジ孔に螺合しかつネジ頭部を
前記貫通孔内に収嵌し、固定ネジを前記軸受ガイドの両
側の側面に穿設した孔に通して前記ネジ頭部支持台の両
側の側面より前記貫通孔に連通して螺設されたネジ孔に
螺合し先端部を前記調整ネジのネジ頭部に刻設された周
溝に嵌入してなる中心吊用ピボット軸受装置において、 前記ネジ頭部支持台の上面より前記貫通孔に僅かに連通
してすれ違うように螺孔したネジ孔に螺合して前記調整
ネジのネジ頭部にすれ違う部分で干渉して前記調整ネジ
を螺回不能にする回り止めネジとからなることを特徴と
する中心吊用ピボット軸受装置。 【請求項２】 前記調整ネジのネジ頭部の前記回り止め
ネジが干渉する箇所の周面を凹凸面となるように形成し
た〔請求項１〕に記載の中心吊用ピボット軸受装置。(1) A bearing guide fixed to a recess at an upper end of a door, wherein the bearing guide has a shaft hole capable of supporting a lower portion of a pivot shaft and a screw hole in a door width direction. A bearing having a threaded screw hole is slidably fitted in the door width direction, and a screw head support base having a through hole drilled in the door width direction is fitted therein, and the male screw portion of the adjusting screw is formed. The screw head is screwed into the screw hole of the bearing, the screw head is fitted into the through hole, and the fixing screw is passed through holes formed on both side surfaces of the bearing guide, and the both side surfaces of the screw head support stand are inserted. A center suspension pivot bearing device, which is screwed into a screw hole which is screwed in communication with the through hole, and a tip end of which is fitted into a circumferential groove formed in a screw head of the adjusting screw; The upper surface of the head support is screwed into a screw hole that is slightly connected to the through hole and screwed so that it passes each other. A pivot bearing device for center suspension, comprising: a detent screw that interferes with a screw head of the adjusting screw at a portion that passes each other to disable the adjusting screw from being screwed. 2. The pivot bearing device for center suspension according to claim 1, wherein a peripheral surface of the screw head of the adjusting screw at a location where the detent screw interferes is formed as an uneven surface.