JP2008289591A

JP2008289591A - Brake for wheelchair

Info

Publication number: JP2008289591A
Application number: JP2007136750A
Authority: JP
Inventors: Eizo Karasawa; 英三唐沢
Original assignee: KARASAWA SEISAKUSHO KK
Current assignee: KARASAWA SEISAKUSHO KK
Priority date: 2007-05-23
Filing date: 2007-05-23
Publication date: 2008-12-04

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake for a wheelchair having a braking mechanism for running, integrated with a wheel fixing mechanism for parking. <P>SOLUTION: The brake 1 is composed of a brake band 4 extending along the outer periphery of a rim part 3a to be braked of a drum 3 which has the circular rim part 3a to be braked in the periphery and which is connected to a hub drum 2b to which wheels are attached via spokes; a first operation member 6 for tightening attaching fixtures 4a and 4b at both ends of the brake band 4 against the energization of a first sprig 5; a pair of semicircular brake shoe support members 9 and 9 whose one ends are pivotally supported by the same pivot 7, and to which parking brake shoes 8 and 8 present along the inner periphery of the rim part 3a to be braked of the drum 3 are respectively attached; and a second operation member 12 for opening open/close end parts 11 and 11 at the opposite side end from the pivot 7 against the energization of a second spring 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、走行時の制動機能と停止状態を維持するパーキング機能を一体化した車椅子用ブレーキに関する。 The present invention relates to a wheelchair brake in which a braking function during traveling and a parking function for maintaining a stopped state are integrated.

従来、車椅子のパーキング用ブレーキには、車輪タイヤの表面を押圧して固定するタックルブレーキ（特許文献１）を用いるのが一般的であった。
特開２００４−１７３９１９号公報 Conventionally, a tackle brake (Patent Document 1) that presses and fixes the surface of a wheel tire is generally used as a parking brake for a wheelchair.
JP 2004-173919 A

上記タックルブレーキは、車輪タイヤの表面を押圧するため、タイヤ空気圧が低い場合、タイヤが凹んでしまって車輪に対する固定効果を充分発揮できないうえ、タイヤ表面を傷つけることがあるという問題があった。 Since the tackle brake presses the surface of the wheel tire, when the tire air pressure is low, there is a problem that the tire is recessed and the fixing effect on the wheel cannot be sufficiently exerted, and the tire surface may be damaged.

本発明は、上記問題を解消することを課題とし、該課題を解決した車椅子用ブレーキを提供することを目的とする。 An object of the present invention is to solve the above-mentioned problems, and to provide a wheelchair brake that solves the problems.

前記目的を達成するために、請求項１に係る本発明の車椅子用ブレーキは、周囲に円形の被制動縁部を有する、スポークを介して車輪を取り付けるハブ胴に連結したドラムの前記被制動縁部外周に沿って伸びるブレーキバンドと、このブレーキバンド両端を、第１付勢部材の付勢力に抗して引き締めるための第１作動部材と、それぞれ半円形状で各一端部を同じ枢軸で枢支し、前記ドラムの前記被制動縁部内周に沿って存置するパーキング用ブレーキシューをそれぞれ取り付けた一対のブレーキシュー支持部材と、第２付勢部材の付勢力に抗して前記枢軸とは反対側端の開閉端部を前記枢軸を中心に開くための第２作動部材とからなるものである。 To achieve the above object, the wheelchair brake of the present invention according to claim 1 has a circular braked edge around the drum, and the braked edge of the drum connected to a hub body to which a wheel is attached via a spoke. A brake band extending along the outer periphery of the part, a first actuating member for tightening both ends of the brake band against the urging force of the first urging member, and a semicircular shape, each end part pivoting on the same pivot A pair of brake shoe support members to which a brake shoe for parking, which is supported along the inner periphery of the braked edge of the drum, is attached, and opposite to the pivot shaft against the urging force of the second urging member It comprises a second actuating member for opening the open / close end of the side end around the pivot.

また、請求項２に係る本発明の車椅子用ブレーキは、請求項１に記載の第１作動部材は、一端に歯車部を有し他端にインナワイヤを取り付けるワイヤ取り付け部を有するとともに、前記歯車部先端にブレーキバンドの一端を連繋した歯車付きアームと、前記歯車付きアームの前記歯車部に噛合し、前記ブレーキバンドの他端にその先端を連繋した連動歯車とからなるものである。 Further, in the wheelchair brake according to the second aspect of the present invention, the first actuating member according to the first aspect has a wire attachment portion that has a gear portion at one end and an inner wire at the other end, and the gear portion. A geared arm having one end of a brake band linked to the tip, and an interlocking gear meshed with the gear portion of the arm with gear and linked the tip to the other end of the brake band.

また、請求項３に係る本発明の車椅子用ブレーキは、請求項１に記載の第２作動部材は、パーキング用ブレーキシューを各有する一対のブレーキシュー支持部材の枢軸側とは反対側端の各開閉端部間に位置し、その回転変位によって前記開閉端部を押し広げるためのクランクと、このクランクを一端に設けた回転軸を端部に連繋し、回転軸を中心に回転変位して、車輪を非固定と固定の両状態とするクランクバーと、このクランクバーを前記非固定状態となる非固定位置と前記固定状態となる固定位置に位置決めするための位置決め部材とから構成する一方、前記枢軸をクランクに対する接離方向に変位可能に支持したものである。 According to a third aspect of the present invention, there is provided the wheelchair brake according to the first aspect, wherein the second actuating member according to the first aspect has a pair of brake shoe support members each having a parking brake shoe and each of the ends opposite to the pivot side. It is located between the opening and closing ends, and a crank for expanding the opening and closing ends by its rotational displacement, and a rotating shaft provided at one end of this crank is connected to the end, and rotationally displaced around the rotating shaft, While comprising a crank bar that puts the wheel in both a non-fixed state and a fixed state, and a positioning member for positioning the crank bar at the non-fixed position that is the non-fixed state and the fixed position that is the fixed state, The pivot is supported so as to be displaceable in the direction of contact with the crank.

また、請求項４に係る本発明の車椅子用ブレーキは、請求項３に記載の位置決め部材は、クランクバーの回転変位方向において、車輪を固定しない非固定状態となる非固定位置の両側に車輪を固定する固定状態となる固定位置を設けてなり、前記非固定位置からいずれの方向にクランクバーを回転変位させても前記固定状態となるものである。 According to a fourth aspect of the present invention, there is provided the wheelchair brake according to the third aspect of the present invention, wherein the positioning member according to the third aspect has the wheels on both sides of the non-fixed position where the wheel is not fixed in the rotational displacement direction of the crank bar. A fixed position for fixing is provided, and the fixed state is obtained even if the crank bar is rotationally displaced in any direction from the non-fixed position.

また、請求項５に係る本発明の車椅子用ブレーキは、請求項１又は請求項２又は請求項３に記載のドラムの被制動縁部内周面とパーキング用ブレーキシュー外周面とに、それぞれ複数の凹凸を形成したものである。 A wheelchair brake according to a fifth aspect of the present invention includes a plurality of brake edge inner peripheral surfaces and a brake brake outer peripheral surface of the drum according to the first, second, or third aspects. Concavities and convexities are formed.

請求項１に係る本発明は、走行用ブレーキとパーキング用ブレーキを一体化したので、従来のようにタックルブレーキを設ける必要がないため、タイヤ空気圧が低い場合の制動不良やタイヤを傷つけるなどのタックルブレーキの欠点を回避できるという効果を奏する。 According to the first aspect of the present invention, since the traveling brake and the parking brake are integrated, it is not necessary to provide a tackle brake as in the prior art, so that the tackle such as braking failure or damage to the tire when the tire air pressure is low. There is an effect that the drawbacks of the brake can be avoided.

請求項２に係る本発明は、前記請求項１に係る発明が奏する効果に加えて、歯車付きアームの端部をインナワイヤで引くことで、このアームの反対側端部の歯車部に連繋したブレーキバンド端を引くので、このブレーキバンド端を引く力は、前記歯車部に噛合する連動歯車に連繋したブレーキバンド端を引く力よりも強くなり、車輪の回転方向に応じて異なる制動力を付与することができるので、ブレーキを、走行速度が大きい前進時には大きな制動力を発揮して確実にブレーキを掛け、比較的低速度の後退時の制動力は必要以上に大きな制動力を発揮しないように構成できるという効果を奏する。 In addition to the effect of the invention according to claim 1, the present invention according to claim 2 is a brake connected to the gear portion at the opposite end of the arm by pulling the end of the geared arm with an inner wire. Since the band end is pulled, the force for pulling the brake band end is stronger than the force for pulling the brake band end linked to the interlocking gear meshing with the gear portion, and gives different braking force depending on the rotation direction of the wheel. The brakes are configured so that the brakes are reliably applied by applying a large braking force when traveling forward at a high traveling speed, and the braking force during reverse traveling at a relatively low speed is not exerted more than necessary. There is an effect that can be done.

請求項３に係る本発明は、請求項１に係る発明が奏する効果に加えて、第２作動部材を、パーキング用ブレーキシューを各有する一対の支持部材の枢支側とは各反対側端の開閉端部間に位置する前記開閉端部をクランクで押し広げるようなしたので、車輪固定動作及びその解除動作が確実であるという効果を奏する。 According to a third aspect of the present invention, in addition to the effect of the first aspect of the invention, the second actuating member is provided at each end opposite to the pivotal support side of the pair of support members each having a parking brake shoe. Since the opening / closing end portion located between the opening / closing end portions is pushed out by the crank, there is an effect that the wheel fixing operation and the releasing operation thereof are reliable.

請求項４に係る本発明は、請求項３及に係る発明が奏する効果に加えて、クランクバーの回転変位方向において非固定位置の両側に固定位置を設けたので、非固定位置からいずれの方向にクランクバーを回転変位させても車輪を固定することができるという効果を奏する。 According to the present invention of claim 4, in addition to the effects of the inventions of claims 3 and 3, the fixed positions are provided on both sides of the non-fixed position in the rotational displacement direction of the crank bar. Even if the crank bar is rotationally displaced, the wheel can be fixed.

請求項５に係る本発明は、請求項１〜請求項４に係る発明が奏する効果に加えて、被制動縁部内周面と、パーキング用ブレーキシュー外周面とに、複数の凹凸を形成したので、両者間の摩擦が増大してパーキング時に確実に車輪を固定できるという効果を奏する。 According to the fifth aspect of the present invention, in addition to the effects produced by the first to fourth aspects of the invention, a plurality of irregularities are formed on the inner peripheral surface of the braked edge and the outer peripheral surface of the brake shoe for parking. As a result, the friction between the two increases, and the wheel can be reliably fixed during parking.

次に、本発明の好適な実施形態を添付図面の図１〜図６に基づいて詳細に説明する。ここにおいて、図１は部分的に縦断した平面図、図２は図１のＡ−Ａ線断面図、図３正面図、図４は車輪の非固定状態における第２作動部材の概略図、図５は車輪の固定状態における第２作動部材の概略図、図６はドラムとパーキング用ブレーキシューとを示す拡大図である。 Next, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 6 of the accompanying drawings. Here, FIG. 1 is a partially longitudinal plan view, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a front view, and FIG. 4 is a schematic view of a second operating member in a non-fixed state of wheels. 5 is a schematic view of the second operating member in a fixed state of the wheel, and FIG. 6 is an enlarged view showing the drum and the brake shoe for parking.

図１〜図６に示すように、ブレーキ１は、車椅子のフレームＡに固定した車軸２ａ（図１参照）に回転自在に取り付けるハブ胴２ｂと一体的に設け、周囲に円形の被制動縁部３ａを有するドラム３の前記被制動縁部３ａ外周に沿ってほぼ３／４周するブレーキバンド４と、このブレーキバンド４の両端に連結した取り付け金具４ａ，４ｂを、第１付勢部材たる第１バネ５の付勢力に抗して引き締めるための、車体ハンドルに設けたブレーキレバー（図示せず）の操作で作動する第１作動部材６とを備える。前記ハブ胴２ｂは、スポークを介して車輪（図示せず）を取り付けるものである。また、前記ブレーキ１は、それそれ半円形状で各一端部を同じ枢軸７で回動可能に枢支し、前記ドラム３の前記被制動縁部３ａ内周に沿って存置するようにパーキング用ブレーキシュー８，８をそれぞれ取り付けた一対のブレーキシュー支持部材９，９と、前記ブレーキシュー支持部材９，９を第２付勢部材たる第２バネ１０の付勢力に抗して各他端の開閉端部１１，１１間を開くよう前記枢軸７を中心に回動させるための第２作動部材１２とを備える。 As shown in FIGS. 1 to 6, the brake 1 is provided integrally with a hub body 2 b that is rotatably attached to an axle 2 a (see FIG. 1) fixed to a frame A of a wheelchair, and has a circular braked edge around it. A brake band 4 that is substantially ¾ of the circumference of the braked edge 3a of the drum 3 having 3a and mounting brackets 4a and 4b that are connected to both ends of the brake band 4 are the first urging members. A first actuating member 6 that is actuated by operating a brake lever (not shown) provided on the vehicle body handle for tightening against the urging force of one spring 5 is provided. The hub body 2b is for attaching wheels (not shown) via spokes. The brake 1 has a semicircular shape, and each end thereof is pivotally supported by the same pivot 7 so that the brake 1 is disposed along the inner periphery of the braked edge 3a of the drum 3. A pair of brake shoe support members 9, 9 to which the brake shoes 8, 8 are respectively attached, and the brake shoe support members 9, 9 against the urging force of the second spring 10 as the second urging member, And a second actuating member 12 for rotating about the pivot shaft 7 so as to open between the open / close end portions 11.

図１及び図２に示すように、前記ブレーキバンド４、前記パーキング用ブレーキシュー８，８、前記ブレーキシュー支持部材９，９は、水や埃の進入を防ぐための円形のカバー体１ａ内側に納められている。前記枢軸７は、前記カバー体１ａに固定した基板１３の長孔（図示せず）を挿通して設けられているので、図２上左右方向（後記クランク２０に対する接離方向）に変位可能である。 As shown in FIGS. 1 and 2, the brake band 4, the parking brake shoes 8 and 8, and the brake shoe support members 9 and 9 are arranged inside a circular cover body 1a for preventing water and dust from entering. It is paid. Since the pivot 7 is provided by being inserted through a long hole (not shown) of the substrate 13 fixed to the cover body 1a, the pivot 7 can be displaced in the left-right direction in FIG. is there.

図１及び図２に示すように、前記第１作動部材６は、前記基板１３に枢軸１４で枢支した歯車部１５を有し、前記歯車部１５とは反対側端部に、ブレーキレバー（図示せず）に連結したインナワイヤ１６ａを取り付けるためのワイヤ取り付け部１６を設けてなり、前記歯車部１５先端をブレーキバンド４の一端側の取り付け金具４ａに連繋した歯車付きアーム１７と、前記ブレーキバンド４の他端側の取り付け金具４ｂに連繋するとともに、歯車付きアーム１７の前記歯車部１５に噛合し、枢軸１８で枢支した連動歯車１９とからなる。また、前記第１バネ５は、連動歯車１９の前記枢軸１８に設けるもので、ブレーキバンド４をドラム３の被制動縁部３ａ外周から引き離すように付勢する。 As shown in FIGS. 1 and 2, the first actuating member 6 has a gear portion 15 that is pivotally supported on the base plate 13 by a pivot shaft 14, and a brake lever ( A gear attachment arm 16 for attaching an inner wire 16a connected to an unillustrated), and a geared arm 17 in which the tip of the gear portion 15 is connected to an attachment fitting 4a on one end side of the brake band 4; 4 is connected to the mounting bracket 4b on the other end side, and meshes with the gear portion 15 of the geared arm 17 and includes an interlocking gear 19 pivotally supported by a pivot shaft 18. The first spring 5 is provided on the pivot 18 of the interlocking gear 19 and biases the brake band 4 so as to be separated from the outer periphery of the braked edge 3 a of the drum 3.

このブレーキ１は、ブレーキバンド４が車椅子の前側（図２の右側）に位置し、第１作動部材６が後側（図２の左側）に位置するように車輪に取り付けられていて、車椅子の前進時には、ドラム３は図２において時計回りに回転し、後退時には反時計方向に回転する。一方、前記歯車付きアーム１７と前記連動歯車１９によりブレーキバンド４を引き締めてドラム３に制動を掛ける構造にあっては、回転するドラム３の被制動縁部３ａ外周面の移動方向と反対方向にブレーキバンド４を引きながら圧接することによって発生する制動力が、前記被制動縁部３ａ外周面の移動方向と同方向に引きながら圧接することによって発生する制動力より大きい。よって、ブレーキバンド４から被制動縁部３ａが受ける前記前進時の制動力は、図２上ブレーキバンド４の上側（前ブレーキバンド４の前記取り付け金具４ａ側）で大きな制動力を得る一方、後退時に受ける制動力は、ブレーキバンド４の下側（前ブレーキバンド４の前記取り付け金具４ｂ側）で大きな制動力を得ることになる。また、歯車付きアーム１７の回動によるブレーキバンド４の取り付け金具４ａを引く力は、歯車付きアーム１７の回転により直接引くので、連動歯車１９と連動歯車１９を介して伝わる力でブレーキバンド４の取り付け金具４ｂを引く力より強い。したがって、歯車付きアーム１７の作動による前進時の制動力は、後退時の制動力より大きなものとなる。具体的には、歯車付きアーム１７のワイヤ取り付け部１６と枢軸１４との距離が長くなるほど取り付け金具４ａを引く力は強くなり、本実施形態では、前進時の制動力と後退時の制動力の比は、６：４程度となる。したがって、ブレーキ１は、走行速度が大きい前進時には大きな制動力を発揮し、比較的低速度の後退時の制動力は必要以上に大きなものにはならない。そして、前記制動力の比は、歯車付きアーム１７のワイヤ取り付け部１６と枢軸１４との距離によって調整可能である。 The brake 1 is attached to the wheel so that the brake band 4 is located on the front side (right side in FIG. 2) of the wheelchair and the first operating member 6 is located on the rear side (left side in FIG. 2). When moving forward, the drum 3 rotates clockwise in FIG. 2, and when moving backward, it rotates counterclockwise. On the other hand, in the structure in which the brake band 4 is tightened by the arm 17 with gear and the interlocking gear 19 to brake the drum 3, the moving direction of the outer peripheral surface of the braked edge 3 a of the rotating drum 3 is opposite to the moving direction. The braking force generated by the pressure contact while pulling the brake band 4 is larger than the braking force generated by the pressure contact while pulling in the same direction as the movement direction of the outer peripheral surface of the braked edge 3a. Therefore, the forward braking force received by the braked edge 3a from the brake band 4 obtains a large braking force on the upper side of the brake band 4 (on the side of the mounting bracket 4a of the front brake band 4) in FIG. The braking force that is sometimes received is a large braking force on the lower side of the brake band 4 (on the mounting bracket 4b side of the front brake band 4). Further, the force pulling the mounting bracket 4a of the brake band 4 by the rotation of the geared arm 17 is directly pulled by the rotation of the geared arm 17, so that the force transmitted through the interlocking gear 19 and the interlocking gear 19 causes the brake band 4 to move. Stronger than the force pulling the mounting bracket 4b. Therefore, the braking force at the time of forward movement by the operation of the geared arm 17 is larger than the braking force at the time of backward movement. Specifically, as the distance between the wire attachment portion 16 of the geared arm 17 and the pivot 14 becomes longer, the force for pulling the attachment fitting 4a becomes stronger. In this embodiment, the braking force during forward movement and the braking force during backward movement are increased. The ratio is about 6: 4. Therefore, the brake 1 exhibits a large braking force when traveling forward at a high traveling speed, and the braking force during reverse traveling at a relatively low speed does not become larger than necessary. The ratio of the braking force can be adjusted by the distance between the wire attachment portion 16 of the geared arm 17 and the pivot 14.

図１〜図５に示すように、第２作動部材１２は、パーキング用ブレーキシュー８，８を各有する一対のブレーキシュー支持部材９，９の枢軸７とは各反対側端の開閉端部１１，１１間に位置し、その回転変位によって前記開閉端部１１，１１を押し広げるようなしたクランク２０と、このクランク２０を先端に設け、前記基板１３に枢支する回転軸２１と、この回転軸２１を端部に連繋し、この回転軸２１を中心に回転変位して、車輪を非固定と固定の両状態とするためのクランクバー２２と、この変位したクランクバー２２を車輪を非固定状態とするための非固定位置と車輪を固定状態とするための固定位置とに位置決めする位置決め部材２３とから構成する。また、前記第２バネ１０は、各ブレーキシュー支持部材９，９の枢軸７近傍に各端部をそれぞれ係止するとともに、中間部分を前記クランクバー２２端に連繋した回転軸２１のクランク２０近傍部分に掛けてあり、前記ブレーキシュー支持部材９，９の前記開閉端部１１，１１を閉じるように付勢する。 As shown in FIGS. 1 to 5, the second actuating member 12 has an opening / closing end 11 at each end opposite to the pivot 7 of the pair of brake shoe support members 9, 9 each having parking brake shoes 8, 8. 11, a crank 20 that pushes and opens the open / close end portions 11 and 11 by the rotational displacement thereof, a rotary shaft 21 that is provided at the tip and pivotally supports the substrate 13, and the rotation A shaft 21 is connected to the end portion, and is rotationally displaced about the rotating shaft 21 to make the wheel both unfixed and fixed, and the displaced crankbar 22 is not fixed to the wheel. The positioning member 23 is positioned at a non-fixed position for setting the state and a fixed position for setting the wheel in a fixed state. Further, the second spring 10 has its end portions locked in the vicinity of the pivot shaft 7 of each brake shoe support member 9, 9, and the intermediate portion connected to the end of the crank bar 22 and the vicinity of the crank 20 of the rotating shaft 21. It is hung on the portion and urges the brake shoe support members 9, 9 to close the open / close end portions 11, 11.

図１、図３〜図５に示すように、位置決め部材２３は、クランクバー２２の回転軸２１側とは反対側端部に設けた係合軸２４に係合する二つの第１係合凹部２５及び第２係合凹部２６を有するとともに、枢軸２７によって前記基板１３に枢支されている。そして、クランクバー２２の前記係合軸２４に位置決め部材２３の第１係合凹部２５を係合した図４に示す位置は、クランク２０がブレーキシュー支持部材９，９の開閉端部１１，１１間を押し広げない、車輪を非固定状態とするための非固定位置であり、また、クランクバー２２の係合軸２４に位置決め部材２３の第２係合凹部２６を係合した図５に示す位置は、クランク２０がブレーキシュー支持部材９，９の開閉端部１１，１１間を押し広げ、パーキング用ブレーキシュー８，８がドラム３の被制動縁部３ａ内周面に押し付けられた、車輪を固定状態とするための固定位置である。 As shown in FIGS. 1 and 3 to 5, the positioning member 23 has two first engaging recesses that engage with an engaging shaft 24 provided at the end of the crank bar 22 opposite to the rotating shaft 21 side. 25 and a second engaging recess 26 and is pivotally supported on the substrate 13 by a pivot 27. 4 is engaged with the engagement shaft 24 of the crank bar 22 and the first engagement recess 25 of the positioning member 23, the crank 20 is at the open / close end portions 11, 11 of the brake shoe support members 9, 9. FIG. 5 shows a non-fixed position for setting the wheel in a non-fixed state that does not spread the gap, and the second engagement recess 26 of the positioning member 23 is engaged with the engagement shaft 24 of the crank bar 22. The position of the wheel is such that the crank 20 pushes between the open / close ends 11, 11 of the brake shoe support members 9, 9 and the parking brake shoes 8, 8 are pressed against the inner peripheral surface of the brake edge 3 a of the drum 3. It is a fixed position for making a fixed state.

図６に示すように、ドラム３の被制動縁部３ａ内周面にドラム３回転方向の直角方向に伸びる複数の凹凸たる溝２８を、また、パーキング用ブレーキシュー８外周面に前記複数の溝２８と同様の複数の凹凸たる溝２９を形成してある。これら溝２８，２９を設けることにより、被制動縁部３ａにパーキング用ブレーキシュー８が押し付けられた際に両者間の摩擦が増し、ドラム３を強固に固定することが可能である。 As shown in FIG. 6, a plurality of concave and convex grooves 28 extending in the direction perpendicular to the rotation direction of the drum 3 are formed on the inner peripheral surface of the brake edge 3a of the drum 3, and the plurality of grooves are formed on the outer peripheral surface of the parking brake shoe 8. A plurality of concave and convex grooves 29 similar to 28 are formed. By providing these grooves 28 and 29, when the parking brake shoe 8 is pressed against the braked edge 3a, the friction between the two increases and the drum 3 can be firmly fixed.

なお、図１及び図３中符号３０は位置決め部材２３を変位する際、手や足を掛けるためのペダル、同じく符号３１はフレームＡと車軸２ａとを固定する際に用いるブラケットである。また、図１、図２及び図３中符号３２は、ブレーキワイヤのアウタワイヤ３２ａ端を固定するとともに、インナワイヤ１６ａを挿通するようなしたアウタワイヤ取り付け部である。 In FIG. 1 and FIG. 3, reference numeral 30 denotes a pedal for placing a hand or a foot when the positioning member 23 is displaced, and reference numeral 31 denotes a bracket used to fix the frame A and the axle 2a. 1, 2, and 3, reference numeral 32 denotes an outer wire attachment portion that fixes the outer wire 32 a end of the brake wire and inserts the inner wire 16 a.

以上のように構成したブレーキ１は、車椅子走行時に介助者がハンドルに設けたブレーキレバー（図示せず）を引くと、ブレーキワイヤのインナワイヤ１６ａを介して歯車付きアーム１７が枢軸１４を中心に回動するとともに、その歯車部１５と噛合した連動歯車１９が枢軸１８を中心に回動してブレーキバンド４両端が引き締められ、ブレーキバンド４全体が回転するドラム３の被制動縁部３ａ外周に圧接し、前記ドラム３に固定したハブ胴２ｂに取り付けた車輪（図示せず）に制動を掛けるものである。 In the brake 1 configured as described above, when an assistant pulls a brake lever (not shown) provided on a handle during wheelchair travel, the geared arm 17 rotates around the pivot 14 via the inner wire 16a of the brake wire. The interlocking gear 19 that meshes with the gear portion 15 rotates about the pivot 18 to tighten both ends of the brake band 4, and the brake band 4 as a whole is pressed against the outer periphery of the braked edge 3 a of the drum 3. The wheels (not shown) attached to the hub barrel 2b fixed to the drum 3 are braked.

また、パーキングの際には、走行可能な図４の状態において、介助者が車輪固定機構１４における第２作動部材１２の位置決め部材２３をそのペダル３０（図３参照）を足で踏んだり手をかけて図４上時計方向に回動すると、位置決め部材２３が枢軸２７を中心に同方向に回転変位し、クランクバー２２の係合軸２４が位置決め部材２３の第１係合凹部２５から第２係合凹部２６に移るとともに、クランクバー２２及びクランク２０が回転軸２１とともに回転変位し、かつ該変位状態を維持する。このようにして前記クランク２０が回転すると、ブレーキシュー支持部材９，９の開閉端部１１，１１間をこじ開けるようにして、前記ブレーキシュー支持部材９，９を押し広げ、パーキング用ブレーキシュー８，８外周面をドラム３の被制動縁部３ａ内周面に押し付けてドラム３、すなわち車輪（図示せず）を固定する。このとき、枢軸７が反クランク２０方向に変位して、パーキング用ブレーキシュー８，８は全体的に被制動縁部３ａ内周面に当接する。また、この車輪の固定状態を解除するには、前記と逆方向（反時計方向）に位置決め部材２３を回動すればよい。 Further, when parking, in the state of FIG. 4 in which the vehicle can run, an assistant steps on the pedal 30 (see FIG. 3) of the positioning member 23 of the second operating member 12 in the wheel fixing mechanism 14 with his / her foot. 4, the positioning member 23 is rotationally displaced in the same direction around the pivot 27, and the engagement shaft 24 of the crank bar 22 is moved from the first engagement recess 25 of the positioning member 23 to the second position. While moving to the engaging recess 26, the crank bar 22 and the crank 20 are rotationally displaced together with the rotating shaft 21, and the displaced state is maintained. When the crank 20 rotates in this way, the brake shoe support members 9 and 9 are pushed open and widened so that the open / close end portions 11 and 11 of the brake shoe support members 9 and 9 are opened. 8 The outer peripheral surface is pressed against the inner peripheral surface of the braked edge portion 3a of the drum 3 to fix the drum 3, that is, the wheel (not shown). At this time, the pivot shaft 7 is displaced in the anti-crank 20 direction, and the parking brake shoes 8 and 8 are entirely in contact with the inner peripheral surface of the braked edge portion 3a. Further, in order to release the fixed state of the wheel, the positioning member 23 may be rotated in the opposite direction (counterclockwise) to the above.

続いて、パーキング用の第２作動部材の他の実施形態を図７〜図９によって説明する。ここにおいて、図７は車輪の非固定状態における第２作動部材の概略図、図８は車輪の固定状態における第２作動部材の概略図、図９は前記図８とは反対側への回転変位による車輪の非固定状態における第２作動部材の概略図である。 Next, another embodiment of the second actuating member for parking will be described with reference to FIGS. 7 is a schematic diagram of the second operating member in a non-fixed state of the wheel, FIG. 8 is a schematic diagram of the second operating member in a fixed state of the wheel, and FIG. 9 is a rotational displacement on the opposite side to FIG. It is the schematic of the 2nd operation member in the non-fixed state of the wheel by.

図７〜図９に示すように、車輪固定機構における第２作動部材５０は、パーキング用ブレーキシュー（図示せず）を各有する一対のブレーキシュー支持部材５１，５１の開閉端部５２，５２間に位置し、その回転変位によって前記開閉端部５２，５２を押し広げるようなしたクランク５３と、このクランク５３を先端に設け基板５４に枢支する回転軸５５と、この回転軸５５を端部に連繋し、この回転軸５５を中心に回転変位して、車輪を非固定と固定の両状態とするためのクランクバー５６と、この回転変位したクランクバー５６を、車輪を固定しない非固定状態となす非固定位置と、車輪を固定する固定状態となす固定位置とに維持する位置決め部材である前記基板５４とから構成する。前記基板５４には、前記クランクバー５６の中間部位に設けた係合軸５７に係合する第１〜第３係合凹部５９，６０，６１を設けてあり、この基板５４は図示しないカバー体（前述の実施形態のカバー体１ａと同様のもの）に固定されている。また、前記係合軸５７は、スプリングバネ５８によって前記各係合凹部５９，６０，６１方向に付勢されている。 As shown in FIGS. 7 to 9, the second actuating member 50 in the wheel fixing mechanism is between the open / close end portions 52, 52 of a pair of brake shoe support members 51, 51 each having a parking brake shoe (not shown). The crank 53 is located at the end of the opening / closing end 52, 52 by the rotational displacement thereof, the rotary shaft 55 is provided at the tip of the crank 53 and pivotally supported on the substrate 54, and the rotary shaft 55 is connected to the end. And a crank bar 56 for rotationally displacing the rotating shaft 55 around the rotating shaft 55 to bring the wheel into a non-fixed and fixed state, and the crank bar 56 that has been rotationally displaced is in a non-fixed state where the wheel is not fixed. The substrate 54 is a positioning member that maintains a non-fixed position and a fixed position for fixing the wheel. The substrate 54 is provided with first to third engagement recesses 59, 60, 61 for engaging with an engagement shaft 57 provided at an intermediate portion of the crank bar 56. The substrate 54 is a cover body (not shown). (It is the same as the cover body 1a of the above-mentioned embodiment). Further, the engagement shaft 57 is biased by the spring spring 58 in the direction of the engagement recesses 59, 60, 61.

上記第２作動部材５０は、クランクバー５６の係合軸５７が基板５５の第２係合凹部６０に係合している状態（図７参照）では、クランク５３が開閉端部５２，５２間を押し広げないので、ブレーキシュー支持部材５１，５１は作動せず、そのパーキング用ブレーキシューがドラムの被制動縁部に押し付けられていない、車輪を非固定状態とする非固定位置にある。また、クランクバー５６を図７上時計方向に回転変位して前記係合軸５７が基板５４の第１係合凹部５９に係合している状態（図８参照）では、クランク５３が開閉端部５２，５２間を押し広げるので、ブレーキシュー支持部材５１，５１が作動して、そのパーキング用ブレーキシューがドラムの被制動縁部に押し付けられた、車輪を固定状態とする固定位置にある。さらに、クランクバー５６を図７上反時計方向に回転変位して前記係合軸５７が基板５４の第３係合凹部６１に係合している状態（図９参照）では、前記図８状態と同様に、クランク５３が開閉端部５２，５２間を押し広げるので、ブレーキシュー支持部材５１，５１が作動して、そのパーキング用ブレーキシューがドラムの被制動縁部に押し付けられた、車輪を固定状態とする固定位置にある。このように、前記第２作動部材５０を用いたブレーキは、前記非固定位置からいずれの方向にクランクバー５６を回転変位させても車輪を前記固定状態にすることができるのである。 In the state where the engagement shaft 57 of the crank bar 56 is engaged with the second engagement recess 60 of the substrate 55 (see FIG. 7), the second operation member 50 has the crank 53 between the open / close end portions 52 and 52. Therefore, the brake shoe support members 51 and 51 are not operated, and the parking brake shoe is not pressed against the brake edge of the drum, and is in the non-fixed position where the wheel is unfixed. Further, in a state where the crank bar 56 is rotationally displaced clockwise in FIG. 7 and the engagement shaft 57 is engaged with the first engagement recess 59 of the substrate 54 (see FIG. 8), the crank 53 is opened and closed. Since the space between the portions 52 and 52 is expanded, the brake shoe support members 51 and 51 are operated, and the parking brake shoe is pressed against the braked edge portion of the drum and is in a fixed position where the wheel is fixed. Further, when the crank bar 56 is rotationally displaced counterclockwise in FIG. 7 and the engagement shaft 57 is engaged with the third engagement recess 61 of the substrate 54 (see FIG. 9), the state shown in FIG. Similarly, the crank 53 spreads between the open / close end portions 52, 52, so that the brake shoe support members 51, 51 are operated, and the parking brake shoe is pressed against the braked edge portion of the drum. It is in a fixed position to be fixed. Thus, the brake using the second actuating member 50 can keep the wheel in the fixed state even if the crank bar 56 is rotationally displaced in any direction from the non-fixed position.

なお、本発明は、上記各実施形態に何ら限定されるものではなく、例えば、第１作動部材６と、第２作動部材１２，５０とは、上記各実施形態のような構造とは異なる構造を有するものであってもよい。 The present invention is not limited to the above-described embodiments. For example, the first operating member 6 and the second operating members 12, 50 are different from the structures of the above-described embodiments. It may have.

部分的に縦断した平面図。The top view partially cut longitudinally. 図１のＡ−Ａ線断面図。AA sectional view taken on the line AA of FIG. 正面図。Front view. 車輪の非固定状態における第２作動部材の概略図。The schematic diagram of the 2nd operation member in the non-fixed state of a wheel. 車輪の固定状態における第２作動部材の概略図。The schematic diagram of the 2nd operation member in the fixed state of a wheel. ドラムとパーキング用ブレーキシューとを示す拡大図。The enlarged view which shows a drum and the brake shoe for parking. 他の実施形態における車輪の非固定状態における第２作動部材の概略図。The schematic diagram of the 2nd operation member in the non-fixed state of the wheel in other embodiments. 同実施形態における車輪の固定状態における第２作動部材の概略図。The schematic diagram of the 2nd operation member in the fixed state of the wheel in the embodiment. 同実施形態における前記図７とは反対側への回転変位による車輪の非固定状態における第２作動部材の概略図。The schematic diagram of the 2nd operation member in the non-fixed state of the wheel by the rotation displacement to the opposite side to the above-mentioned FIG. 7 in the embodiment.

符号の説明Explanation of symbols

１ブレーキ
１ａカバー体
２ａ車軸
２ｂハブ胴
３ドラム
３ａ被制動縁部
４ブレーキバンド
５第１バネ
６第１作動部材
７枢軸
８パーキング用ブレーキシュー
９ブレーキシュー支持部材
１０第２バネ
１１開閉端部
１２第２作動部材
１３基板
１４枢軸
１５歯車部
１６ワイヤ取り付け部
１６ａインナワイヤ
１７歯車付きアーム
１８枢軸
１９連動歯車
２０クランク
２１回転軸
２２クランクバー
２３位置決め部材
２４係合軸
２５第１係合凹部
２６第２係合凹部
２７枢軸
２８溝
２９溝
３０ペダル
３２アウタワイヤ取り付け部
３２ａアウタワイヤ
５０第２作動部材
５１ブレーキシュー支持部材
５２開閉端部
５３クランク
５４基板
５５回転軸
５６クランクバー
５７係合軸
５８スプリングバネ
５９第１係合凹部
６０第２係合凹部
６１第３係合凹部 DESCRIPTION OF SYMBOLS 1 Brake 1a Cover body 2a Axle 2b Hub drum 3 Drum 3a Brake edge 4 Brake band 5 1st spring 6 1st operation member 7 Axis 8 Parking brake shoe 9 Brake shoe support member 10 2nd spring 11 Opening and closing end 12 Second actuating member 13 Substrate 14 Pivot shaft 15 Gear portion 16 Wire mounting portion 16a Inner wire 17 Geared arm 18 Pivot 19 Interlocking gear 20 Crank 21 Rotating shaft 22 Crank bar 23 Positioning member 24 Engagement shaft 25 First engagement recess 26 Second Engagement recess 27 Pivot 28 Groove 29 Groove 30 Pedal 32 Outer wire attachment part 32a Outer wire 50 Second operating member 51 Brake shoe support member 52 Opening / closing end 53 Crank 54 Substrate 55 Rotating shaft 56 Crank bar 57 Engagement shaft 58 Spring spring 59 First 1 engaging recess 60 second engaging recess 61 third engaging recess

Claims

周囲に円形の被制動縁部を有する、スポークを介して車輪を取り付けるハブ胴に連結したドラムの前記被制動縁部外周に沿って伸びるブレーキバンドと、このブレーキバンド両端を、第１付勢部材の付勢力に抗して引き締めるための第１作動部材と、それぞれ半円形状で各一端部を同じ枢軸で枢支し、前記ドラムの前記被制動縁部内周に沿って存置するパーキング用ブレーキシューをそれぞれ取り付けた一対のブレーキシュー支持部材と、第２付勢部材の付勢力に抗して前記枢軸とは反対側端の開閉端部を前記枢軸を中心に開くための第２作動部材とからなる車椅子用ブレーキ。 A brake band extending around the outer periphery of the braked edge of the drum having a circular braked edge at the periphery and connected to a hub drum to which a wheel is attached via a spoke, and both ends of the brake band are connected to the first biasing member. A first actuating member for tightening against the urging force of the brake, and a brake shoe for parking that is semicircular and has one end pivotally supported by the same pivot and is located along the inner periphery of the braked edge of the drum A pair of brake shoe support members, and a second actuating member for opening an open / close end portion opposite to the pivot shaft around the pivot shaft against the biasing force of the second biasing member. Become a wheelchair brake.

第１作動部材は、一端に歯車部を有し他端にインナワイヤを取り付けるワイヤ取り付け部を有するとともに、前記歯車部先端にブレーキバンドの一端を連繋した歯車付きアームと、前記歯車付きアームの前記歯車部に噛合し、前記ブレーキバンドの他端にその先端を連繋した連動歯車とからなることを特徴とする請求項１に記載の車椅子用ブレーキ。 The first actuating member has a gear attachment part having a gear part at one end and an inner wire attached to the other end, and an arm with a gear in which one end of a brake band is connected to the tip of the gear part, and the gear of the arm with the gear. The wheelchair brake according to claim 1, further comprising an interlocking gear meshing with a portion and having a tip end connected to the other end of the brake band.

第２作動部材は、パーキング用ブレーキシューを各有する一対のブレーキシュー支持部材の枢軸側とは反対側端の各開閉端部間に位置し、その回転変位によって前記開閉端部を押し広げるためのクランクと、このクランクを一端に設けた回転軸を端部に連繋し、回転軸を中心に回転変位して、車輪を非固定と固定の両状態とするクランクバーと、このクランクバーを前記非固定状態となる非固定位置と前記固定状態となる固定位置に位置決めするための位置決め部材とから構成する一方、前記枢軸をクランクに対する接離方向に変位可能に支持したことを特徴とする請求項１に記載の車椅子用ブレーキ。 The second actuating member is positioned between the open / close ends of the pair of brake shoe support members each having a parking brake shoe opposite to the pivot side, and is used to push the open / close end by the rotational displacement thereof. A crank, a rotating shaft provided at one end of the crank is connected to the end, a crank bar that rotates and displaces around the rotating shaft to place the wheel in both an unfixed state and a fixed state, and the crank bar is 2. The non-fixed position in a fixed state and a positioning member for positioning at the fixed position in the fixed state, while the pivot is supported so as to be displaceable in a contact / separation direction with respect to a crank. The wheelchair brake described in 1.

位置決め部材は、クランクバーの回転変位方向において、車輪を固定しない非固定状態となる非固定位置の両側に車輪を固定する固定状態となる固定位置を設けてなり、前記非固定位置からいずれの方向にクランクバーを回転変位させても前記固定状態となることを特徴とする請求項３に記載の車椅子用ブレーキ。 The positioning member is provided with a fixed position for fixing the wheel on both sides of the non-fixed position where the wheel is not fixed in the rotational displacement direction of the crank bar, and in any direction from the non-fixed position. The wheelchair brake according to claim 3, wherein the fixed state is achieved even when the crank bar is rotated and displaced.

ドラムの被制動縁部内周面とパーキング用ブレーキシュー外周面とに、それぞれ複数の凹凸を形成したことを特徴とする請求項１又は請求項２又は請求項３又は請求項４に記載の車椅子用ブレーキ。 5. The wheelchair according to claim 1, claim 2, claim 3, or claim 4, wherein a plurality of irregularities are formed on the inner peripheral surface of the braked edge of the drum and the outer peripheral surface of the brake shoe for parking. brake.