JPS5829500B2 - Stepless adjustment mechanism for supporting height of projection screens, etc. - Google Patents

Stepless adjustment mechanism for supporting height of projection screens, etc.

Info

Publication number
JPS5829500B2
JPS5829500B2 JP1889079A JP1889079A JPS5829500B2 JP S5829500 B2 JPS5829500 B2 JP S5829500B2 JP 1889079 A JP1889079 A JP 1889079A JP 1889079 A JP1889079 A JP 1889079A JP S5829500 B2 JPS5829500 B2 JP S5829500B2
Authority
JP
Japan
Prior art keywords
ratchet wheel
support
adjustment mechanism
link
arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP1889079A
Other languages
Japanese (ja)
Other versions
JPS55110236A (en
Inventor
俊和 高橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP1889079A priority Critical patent/JPS5829500B2/en
Publication of JPS55110236A publication Critical patent/JPS55110236A/en
Publication of JPS5829500B2 publication Critical patent/JPS5829500B2/en
Expired legal-status Critical Current

Links

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  • Overhead Projectors And Projection Screens (AREA)
  • Transmission Devices (AREA)

Description

【発明の詳細な説明】 本発明は上方より吊下げられたもの又は下から上向きに
押し上げられる如く支持されたものを任意の支持高さに
無段階状に保持させることができる装置に関するもので
ある。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that can steplessly hold an object suspended from above or pushed upward from below at an arbitrary support height. .

映写用スクリーン、特に天井等の固定部より吊下げ状に
保持された形式のスクリーンで自動巻上式のものは使用
時にスクリーンを円筒ケースより引き出して展張させ,
用済後はスクリーンをばねの巻込力によって円筒ケース
内へ巻状するようになっているが,天井に対する円筒ケ
ースの取付位置が一定高さを必要としその距離が不変で
ある為に天井が比較的低いような場所ではスクリーンを
上方へ引き上げても円筒ケース自体が天井から下方へ突
出した状態となって相当の空間を占有するので室内が狭
く他の邪魔になって不都合を生じるのみならず、余まり
体裁も良くないものである。
Projection screens, especially those that are suspended from a fixed part such as the ceiling and are automatically rolled up, are used by pulling out the screen from the cylindrical case and extending it.
After use, the screen is rolled into the cylindrical case by the winding force of the spring, but since the mounting position of the cylindrical case relative to the ceiling requires a certain height and the distance remains unchanged, the screen does not close to the ceiling. In relatively low places, even if the screen is pulled upward, the cylindrical case itself protrudes downward from the ceiling and occupies a considerable amount of space, which not only makes the room narrower but also causes inconvenience as it gets in the way of other objects. , it doesn't look very good either.

又,スクリーンを引き出した場合でもそのスクリーン面
の吊下げ高さは常に一定であるから高さを調整しようと
しても固定式では仲々困難であった。
Furthermore, even when the screen is pulled out, the hanging height of the screen surface is always constant, so it is difficult to adjust the height with a fixed type.

本発明はこのような従来の欠点に対処する為支持物全体
を屈伸自在な上下リンクよりなる支持アームで保持させ
ると共に,支持アームの関節部分に支持物の重量に対応
できる制動を利かせたラチェツト車とこれに係合して伸
長方向の動きを制御する係止爪とを設けることによって
支持物全体を通常の吊下げ位置から上方へ引き上げるこ
とができるようにして不用時には全体を天井内へ引込め
ておけるようにすると共に,任意の支持高さへワンタッ
チで無段階状に調整できるようにしたものである。
In order to overcome these conventional drawbacks, the present invention has the entire support supported by a support arm consisting of flexible upper and lower links, and a ratchet at the joint part of the support arm that is capable of braking to accommodate the weight of the support. By providing a locking pawl that engages with the wheel and controls the movement in the extension direction, the entire support can be lifted upward from its normal hanging position, and the entire support can be pulled into the ceiling when not in use. In addition to making it possible to hold the support in place, it also allows for stepless adjustment to any desired support height with a single touch.

以下その詳細を図面の実施例に一ついて説明する。The details will be explained below with reference to the embodiments shown in the drawings.

1は中央の関節軸2を中心に屈伸自在な上下リンク3,
4よりなる支持アームであり,上部リンク3の上端は固
定ブラケット5に支軸6で枢着し。
1 is a vertical link 3 that can be freely bent and extended around a central joint axis 2;
The upper end of the upper link 3 is pivotally connected to a fixed bracket 5 by a support shaft 6.

下部リンク4の下端は可動ブラケット7に同様の支軸8
で枢着する。
The lower end of the lower link 4 is attached to a support shaft 8 similar to the movable bracket 7.
to pivot.

固定ブラケット5は天井9等の固定部に固定し、可動ブ
ラケット7はスクリーン巻収用円筒ケース10等の支持
物に取付ける。
The fixed bracket 5 is fixed to a fixed part such as a ceiling 9, and the movable bracket 7 is attached to a support such as a cylindrical screen winding case 10.

11は前記関節軸2に軸着されたラチェツト車であり、
該ラチェツト車11は固定部側となる上部リンク3に対
し回転制動を附与せしめている。
11 is a ratchet wheel pivotally attached to the joint shaft 2;
The ratchet wheel 11 applies rotational braking to the upper link 3, which is the fixed portion.

12はその為の制動板であり1合成樹脂又は皮革よりな
る円板形のものをラチェツト車11の内面と上部リンク
3の外面との間に挾持せしめた状態で関節軸2に装着し
、スラストベアリング13を介してナツト14で螺締し
、その全体を関節軸2と一体の固定部2aに押圧させて
いる。
Reference numeral 12 designates a brake plate for this purpose. 1 A disc-shaped brake plate made of synthetic resin or leather is attached to the joint shaft 2 while being sandwiched between the inner surface of the ratchet wheel 11 and the outer surface of the upper link 3. It is screwed with a nut 14 through a bearing 13, and the entire body is pressed against a fixed part 2a integrated with the joint shaft 2.

従ってこのナツト14を強く螺締すればする程制動板1
2が強圧されるからリンク3に対するラチェツト車11
の制動力は強大となるものであり、その為この制動力を
円筒ケース10等の支持物全重量に対抗できる大きさに
設定すれば屈伸自在なアーム1が屈曲した状態のま\で
これを吊持支持させることができるものである。
Therefore, the more strongly this nut 14 is screwed, the more the brake plate 1
Ratchet wheel 11 against link 3 because 2 is under strong pressure
The braking force is strong, so if this braking force is set to a level that can resist the entire weight of the support such as the cylindrical case 10, the arm 1, which can be bent and extended, can be held in a bent state. It can be suspended and supported.

15は可動部側となる下部リンク4上に装設された係止
爪であり、これは関節軸2を中心に円運動する位置にお
いて前記ラチェツト車11の歯11aと係合して一回転
方向を阻止し、これによりアーム伸長方向の動きを制御
させるものである。
Reference numeral 15 denotes a locking pawl installed on the lower link 4, which is the movable part side, which engages with the teeth 11a of the ratchet wheel 11 at a position where it moves circularly around the joint axis 2, and rotates in one rotation direction. This prevents the movement of the arm in the extension direction, thereby controlling the movement in the arm extension direction.

係止爪15は下部リンク4の上端部に出没自在にばね1
6の弾力を附勢して装着され、ラチェツト車11の歯1
1aの向きに沿う方向に対してはそのピッチ毎に没入し
て空送りするものである。
The locking pawl 15 is attached to the upper end of the lower link 4 so that it can freely come out and retract from the spring 1.
It is mounted with the elastic force of 6 applied, and the tooth 1 of the ratchet wheel 11
In the direction along the direction of 1a, the feed is immersed at every pitch and is fed in a blank manner.

関節軸2に対する下部リンク4は固定部2aの前記制動
側とは反対側の軸部2bに遊挿されその上から軸組とし
たねじ軸2cにナツト17を螺締して取付けられるよう
にする。
The lower link 4 for the joint shaft 2 is loosely inserted into the shaft portion 2b of the fixed portion 2a on the opposite side to the braking side, and can be attached by screwing a nut 17 onto the threaded shaft 2c assembled from above. .

従って下部リンク4は関節軸2に対して何等の制約なし
に自由回転しつる。
Therefore, the lower link 4 can freely rotate with respect to the joint axis 2 without any restrictions.

上下リンク3,4からなる支持アーム1は第1図のよう
に左右対称に2条設けてパンタグラフ形となし、その上
下リンク3,4の枢着部となる支軸6,8に左右のアー
ムと一体で且つ互いに噛合するギヤー18.19,20
.21を設ける。
As shown in Fig. 1, the support arm 1 consisting of the upper and lower links 3 and 4 has two symmetrical strips to form a pantograph shape, and the left and right arms are attached to the support shafts 6 and 8, which are the pivot points of the upper and lower links 3 and 4. Gears 18, 19, 20 that are integral with and mesh with each other.
.. 21 will be provided.

この各ギヤーは第1図のように上下リンク3,4の端部
を利用してこれに歯形を形成してもよく、又第4図のよ
うに別体ものの歯車(扇形歯車も可)を取付けるように
することもできる。
Each gear may be formed with a tooth profile using the ends of the upper and lower links 3 and 4 as shown in Fig. 1, or a separate gear (a sector gear is also possible) as shown in Fig. 4. It can also be installed.

上記した構成において、可動ブラケット7に下向きの荷
重が作用すると支持アーム1はく字形を呈した状態から
伸長しようとするが、既述のように上下リンク3,4の
関節軸に装備したラチェツト車11と制動板12とによ
ってブレーキが利いており、且つその制動力が円筒ケー
ス10を含む全自重より少くとも大きいので支持物全体
は下降することなくその状態を保っている。
In the above-mentioned configuration, when a downward load is applied to the movable bracket 7, the support arm 1 tries to extend from the dogleg-shaped state. 11 and the brake plate 12, and the braking force is at least greater than the entire weight including the cylindrical case 10, so the entire support maintains its state without descending.

この状態から円筒ケース10を外力(手動等)で下方へ
引き下げると前記の自重に外力が附与され且つそれが前
記の制動力に打ち勝つ為に係止爪15でラチェツト車1
1を第2図で反時計方向(矢印イ)に回動させ、アーム
1は伸長する。
When the cylindrical case 10 is pulled down from this state by an external force (such as manually), the external force is added to the dead weight, and in order to overcome the braking force, the locking pawl 15 engages the ratchet wheel 1.
1 in the counterclockwise direction (arrow A) in FIG. 2, and the arm 1 is extended.

伸長した位置で手を放すと再びその位置で停止する。If you release your hand at the extended position, it will stop at that position again.

然してこの引き下げ動作は支持物の荷重にわずかな外力
を附与するだけで行われるから比較的軽く行われる。
However, since this pulling down operation is performed by applying only a slight external force to the load of the support, it is performed relatively lightly.

下降させた位置から上方へ押し上げると係止爪15はラ
チェツト車11に対し前記とは逆の時計方向(矢印口)
へ移動する。
When pushed upward from the lowered position, the locking pawl 15 moves clockwise (as indicated by the arrow) relative to the ratchet wheel 11.
Move to.

その為係止爪はラチェツト車の歯11a上を滑るだけで
ラチェツト車11の送りは行われないから前記の制動力
に関係なく支持アーム1は屈曲させられ任意の位置で手
を放すとその位置で停止する。
Therefore, the locking pawl only slides on the teeth 11a of the ratchet wheel, and the ratchet wheel 11 is not fed, so the support arm 1 is bent regardless of the braking force, and when you release your hand at an arbitrary position, it will move to that position. Stop at.

第1図は天井9に窪み9aを形成してその中に一連の機
構を装備せしめたものであり、用途目的に応じ種々の使
用法が採用できる。
In FIG. 1, a recess 9a is formed in a ceiling 9 and a series of mechanisms are installed in the recess 9a, which can be used in various ways depending on the purpose of use.

又吊下げ式とは逆に、上方向に向けて伸長する形式の押
上げ式にして使用することも可能である。
Moreover, contrary to the hanging type, it is also possible to use a push-up type that extends upward.

この場合は、第1図の状態を逆さにして可動ブラケット
に重量物等の支持台を設ければよい。
In this case, the state shown in FIG. 1 may be turned upside down and a support for heavy objects or the like may be provided on the movable bracket.

本発明は上述の構成からなるものであって、上下リンク
よりなる支持アームの関節軸に固定部側リンクに対し回
転制動を附与したブレーキ付きラチェツト車を設けると
共に、他方可動部側リンク上にラチェツト車と係合して
アーム伸長方向の動きを制御する係止爪を設けたもので
あるから支持物重量に対応するブレーキ力の設定によっ
てワンタッチで押し上げたり、引き下げできると共に。
The present invention has the above-mentioned configuration, and includes a ratchet wheel with a brake that applies rotational braking to the link on the fixed part side on the joint axis of the support arm consisting of the upper and lower links, and a ratchet wheel with a brake that provides rotational braking to the link on the other side of the movable part. Since it is equipped with a locking pawl that engages with the ratchet wheel to control the movement of the arm in the extension direction, it can be pushed up or down with a single touch by setting the braking force corresponding to the weight of the support.

簡単な操作で支持物を任意の高さに保持できて収納・取
出しに至便であり、又重量物でも軽く操作できるので取
扱いが楽であり、而も停止位置は無段階状で節がないた
めに微調整も可能である他。
Supports can be held at any height with simple operations, making storage and removal convenient.Also, even heavy objects can be easily operated, making handling easy.Moreover, the stopping position is stepless and has no knots. Other fine adjustments are also possible.

機構が簡単で耐久性があり安価に実施できる等の優れた
効果が期待できる。
Excellent effects such as a simple mechanism, durability, and low cost can be expected.

【図面の簡単な説明】[Brief explanation of drawings]

図面は本発明の実施例を示すもので、その第1図は天井
のボックス型窪みに本装置を装備した状態の正面図、第
2図はアームの関節部分の拡大正面図、第3図は第2図
A−A線の断面図、第4図はアーム端部の枢着部を示す
拡大平面図である。 1・・・・・・支持アーム、2・・・・・・関節軸、3
,4・・・・・・上下リンク、5・・・・・・固定ブラ
ケット、6,8・・・・・・支軸、7・・・・・・可動
ブラケット、9・・・・・・天井、10・・・・・・円
筒ケース 11・・・・・・ラチェット車、12・・・
・・・制動板、15・・・・・・係止爪、18,19,
20゜21・・・・・・ギヤー。
The drawings show an embodiment of the present invention, in which the first figure is a front view of the device installed in a box-shaped recess in the ceiling, the second figure is an enlarged front view of the joint part of the arm, and the third figure is a front view of the device installed in a box-shaped recess in the ceiling. FIG. 2 is a sectional view taken along the line A--A, and FIG. 4 is an enlarged plan view showing the pivot portion of the arm end. 1...Support arm, 2...Joint axis, 3
, 4... Vertical link, 5... Fixed bracket, 6, 8... Support shaft, 7... Movable bracket, 9... Ceiling, 10... Cylindrical case 11... Ratchet wheel, 12...
...Brake plate, 15...Latching claw, 18, 19,
20°21...Gear.

Claims (1)

【特許請求の範囲】 1 天井等の固定部に設けた固定ブラケットとこれに対
応する可動ブラケットとの間に、中間の関節軸を中心に
く字形に屈伸自在な上下リンクよりなる支持アームを枢
設し、前記関節軸に固定ブラケット側の上部リンクに対
し回転制動を附与する制動板を挟圧状に介装したラチェ
ツト車を設けると共に、他方可動ブラケット側の下部リ
ンクの上端には前記関節軸を中心に円運動する位置にお
いて前記ラチェツト車と係合してアーム伸長方向の動き
を制御する係止爪を設けたことを特徴とする映写用スク
リーン等の支持高さ無段調整機構。 2 支持アームは左右対称に設けてパンタグラフ形とな
し、その上下リンクの各枢着部に左右アームと一体で且
つ互いに噛合するギヤーを設けたことを特徴とする特許 映写用スクリーン等の支持高さ無段調整機構。
[Scope of Claims] 1. A support arm consisting of a vertical link that can be freely bent and extended in a dogleg shape about an intermediate joint axis is pivoted between a fixed bracket provided on a fixed part such as a ceiling and a corresponding movable bracket. A ratchet wheel is provided on the joint axis with a braking plate interposed therein in a pinching manner to impart rotational braking to the upper link on the fixed bracket side, and the upper end of the lower link on the movable bracket side is provided with a ratchet wheel. 1. A stepless support height adjustment mechanism for a projection screen, etc., comprising a locking pawl that engages with the ratchet wheel at a position where it moves circularly about an axis to control movement in the arm's extension direction. 2. Support height of a patented projection screen, etc., characterized in that the support arms are symmetrically arranged in a pantograph shape, and each pivot point of the upper and lower links is provided with a gear that is integral with the left and right arms and meshes with each other. Stepless adjustment mechanism.
JP1889079A 1979-02-19 1979-02-19 Stepless adjustment mechanism for supporting height of projection screens, etc. Expired JPS5829500B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1889079A JPS5829500B2 (en) 1979-02-19 1979-02-19 Stepless adjustment mechanism for supporting height of projection screens, etc.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1889079A JPS5829500B2 (en) 1979-02-19 1979-02-19 Stepless adjustment mechanism for supporting height of projection screens, etc.

Publications (2)

Publication Number Publication Date
JPS55110236A JPS55110236A (en) 1980-08-25
JPS5829500B2 true JPS5829500B2 (en) 1983-06-23

Family

ID=11984154

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1889079A Expired JPS5829500B2 (en) 1979-02-19 1979-02-19 Stepless adjustment mechanism for supporting height of projection screens, etc.

Country Status (1)

Country Link
JP (1) JPS5829500B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6080439U (en) * 1983-11-09 1985-06-04 オーエススクリーン株式会社 automatic screen device
KR101178383B1 (en) * 2005-03-16 2012-08-29 최해용 Potable screen device with dual shaft structure

Also Published As

Publication number Publication date
JPS55110236A (en) 1980-08-25

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