JP2005186870A - Operating device for brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operating device for a brake device assuring a good versatility and capable of locating an operation lever still more certainly. <P>SOLUTION: The operating device 100 for the brake device 1 to restrict the rotation of a brake drum 3 is equipped with the operation lever 112 supported capable of being turned in the movable range including the brake disengage mode to admit the rotation of the brake drum 3 both in the regular and reverse directions and the assist brake mode to restrict only the reverse rotation of the brake drum and energized in the normal condition in the direction from the brake disengage mode till the assist brake mode and an actuation restricting part 120 to restrict the turn of the operation lever 112 from abutting to the lever 112 in the brake disengage mode till reaching the assist brake mode. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a brake device, and more particularly to an operating device for a brake device suitably used for a vehicle such as a wheelchair or an industrial machine.

  As this type of brake device, for example, a drum brake device for a wheelchair shown in Patent Document 1 below is known.

  The wheelchair brake device described in Patent Document 1 includes a brake device including a bidirectional rotary clutch mechanism on an axle, and can switch a clutch mechanism provided in the brake device by operating an operation lever provided separately. It has become.

More specifically, a forward travel position where the clutch mechanism is operated so as to allow only forward rotation of the vehicle, a reverse travel position where the clutch mechanism is operated so as to allow only reverse rotation of the vehicle, and forward rotation of the vehicle The operation lever can be switched to a parking position that restricts both reverse rotation and reverse rotation, and only forward travel is possible when the operation lever is operated to the forward travel position. Further, when operating to the reverse travel position, only reverse travel is possible. Further, when switched to the parking position, travel is restricted both in forward and reverse travel.
Japanese Patent Laid-Open No. 2002-78751

  In addition, a brake device that can be switched to a plurality of operating states like the brake device described above requires a complicated operation device.

  If the brake device is described as an example, an operation in which brackets having guide grooves provided corresponding to respective operation states are fixed to a wheelchair frame and connected to a link arm extending from the brake device. By engaging and fixing the shaft portion of the lever in a desired guide groove, switching to each operation state and holding in each operation state are enabled.

  By the way, according to the intensive studies by the present inventors, various points to be improved regarding the above-described conventional operating device have been found.

  First, it should be noted that in the conventional operation device, the operation lever is engaged with the guide groove, thereby enabling switching to each operation state and holding in each operation state. Therefore, whenever a change occurs in the stroke amount (movable range) of the operation lever, it is necessary to newly redesign the shape and dimensions of the guide groove.

In addition, the guide groove (bracket) and the operation lever are incorporated in the wheelchair in separate manufacturing processes, although they are parts of the same brake device. The bracket is attached when the wheelchair frame is manufactured, and one operation lever is incorporated when the vehicle is mounted on the frame or when the brake device is assembled.
For this reason, it is difficult to obtain consistency in position adjustment between the parts, and in some cases, a phenomenon such as the operation lever dancing (shaking) in the guide groove occurs.

  The present invention has been made in consideration of such a technical background, and has an object to provide an operating device for a brake device that is versatile and can position the operating lever more reliably.

In order to solve the above technical problem, the present invention provides the following configuration.
That is, the present invention
An operating device for a brake device that restricts rotation of a rotating body,
A first position that allows normal rotation and reverse rotation of the rotating body and a second position that restricts only one of forward rotation and reverse rotation of the rotating body, and is operably supported within a movable range; And an operation lever biased from the first position toward the second position in a normal state;
An operation restricting portion that abuts the operation lever at the first position and restricts the movement of the operation lever to reach the second position;
It is characterized by providing.

In this invention comprised in this way, the 1st position which accept | permits normal rotation and reverse rotation of a rotary body, and the 2nd position which controls any one of normal rotation and reverse rotation of a rotary body are included. An operation lever that can be operated in a movable range is provided. Further, the operation lever is normally biased from the first position toward the second position.
Further, an operation restricting portion is provided that restricts the movement of the operation lever that contacts the operation lever at the first position and reaches the second position.

Therefore, the operation lever is in a contact state at the operation restricting portion due to the external force accompanying the urging, and the operation lever is positioned at the first position by the contact state.
That is, the external force accompanying the urging and the reaction force against the external force are in a state of acting on the operation lever, and the operation lever is positioned by the balance between these two forces. Therefore, the operation lever can be positioned more reliably than the positioning depending on the engagement. Further, there is no need for a guide groove for engagement, and various specifications can be easily accommodated by changing the abutting location or the like.

A support member for operably supporting the operation lever;
The support member includes a contact member that can contact the operation lever, and an urging unit that urges the contact member toward the operation lever.
The operation lever may be provided with an operation restricting member that contacts the contact member at the first position and restricts the movement of the operation lever reaching the second position.

  According to this configuration, the operation lever is connected to and supported by the support member, and the support member includes a contact member as an operation restricting portion and a biasing unit that biases the contact member toward the operation lever. Is provided. The operation lever is provided with an operation restricting member that comes into contact with the previous contact member when operated to the first position. The operation lever is in contact with the contact member and the operation restricting member. Is positioned.

  In addition, a third position that restricts both forward rotation and reverse rotation of the rotating body is provided at a position different from the second position, and the operation lever is moved from the third position to the normal position in the normal state. A configuration may be adopted in which biasing is performed in a direction that reaches the second position via the first position.

  In this configuration, a third position for restricting the rotation of the rotating body is set at a position different from the second position, and when the operation lever is operated to the third position, the rotation of the rotating body is restricted. Further, since the operation lever is normally biased in the direction from the third position to the second position via the first position, the operation lever is moved to the operation restricting portion at the same time as reaching the first position. In this state, a contact state is established, and the movement of the operation lever is restricted at the first position. Therefore, the operator can operate the operation lever between the third position and the first position without being aware of the operation to the second position.

In addition, the brake device includes a main braking member that regulates normal rotation and reverse rotation of the rotating body, and an auxiliary brake that contacts the rotating body when the rotating body rotates in reverse and self-locks to restrict the rotation of the rotating body. A member, and an operation cam that individually operates the main braking member and the auxiliary braking member following an operation on the operation lever,
When the operation lever is operated from the first position toward the third position, the operation cam is operated so that the main braking member is pressed against the rotating body with a pressing force corresponding to the operation amount.
The operation cam may be configured to operate so that only the auxiliary braking member contacts the rotating body when the operation lever is operated to the second position.

  That is, when the operation lever is operated from the first position toward the third position, the main braking member is pressed against the rotating body with a pressing force based on the operation force at that time. Then, forward rotation and reverse rotation of the rotating body are regulated by the braking force generated by the main braking member. When the operating lever is operated to the second position, the auxiliary braking member comes into contact with the rotating body, and only the reverse rotation of the rotating body is restricted by the braking force generated by the auxiliary braking member.

  Moreover, it is good also as a structure provided with the one-way clutch apparatus which accept | permits only the action | operation of the operation lever which goes to the said 3rd position from the said 1st position, and the cancellation | release apparatus which cancels | releases the operation regulation by this one-way clutch apparatus.

In this configuration, a one-way clutch device is provided that allows only the operation of the operation lever from the first position toward the third position. Therefore, when the operation lever is operated toward the third position, the operation lever is thereafter held at a position corresponding to the operation amount. Therefore, the braking force corresponding to the operation amount is maintained without operating the operation lever. Further, when the release device is activated, the operation lever can be operated in a desired direction, so that the braking force can be weakened or strengthened by operating the operation lever.
Examples of the one-way clutch device include a one-way meshing clutch, a ratchet device, and the like.

The present invention also provides the following configuration in order to solve the above technical problem.
That is, the present invention is an operating device for a brake device that restricts rotation of a rotating body,
An operation lever for applying a braking force corresponding to the operation amount to the rotating body when operated in a predetermined direction;
A one-way clutch device that allows only the operation of the operation lever toward the predetermined direction and holds the operation lever at a position corresponding to the operation amount;
A release device for releasing the operation restriction of the operation lever by the one-way clutch device;
When operating the operation lever toward the predetermined direction, an operation unit for operating the release device provided on an arm extending to a position where the operation lever can be held together with the operation lever;
It is characterized by providing.

  The present invention configured as described above includes a one-way clutch device that allows only an operation toward a predetermined direction in which a braking force is exerted. Therefore, when operating in a predetermined direction, the operation lever is held at a position corresponding to the operation amount, and thereafter, the braking force corresponding to the operation amount is maintained without operating the operation lever.

  In addition, a release device for releasing the operation restriction of the operation lever is provided, and an operation portion of the release device is provided on an arm that can be held with one hand together with the operation lever. That is, since the release device can be operated while holding the operation lever, the operator can release the operation restriction of the operation lever while maintaining the braking force.

  The operation unit provided on the arm may be configured to be operable in a circumferential direction of the arm.

  In this configuration, the operation unit is provided to be operable in the circumferential direction of the arm. Accordingly, even when the operation lever is pulled toward the arm side, the operation unit can be easily operated with the thumb or the like without loosening the force on the operation lever.

  The various contents described above can be combined as much as possible without departing from the scope of the present invention.

  As described above, according to the present invention, it is possible to provide an operating device for a brake device that is rich in versatility and that can position the operating lever more reliably.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the present embodiment, an example in which the operating device of the present invention is applied to a wheelchair brake device will be described.
First, prior to the description of the operating device according to the present invention, a brake device as an operation target will be described.

  The brake device 1 shown in the present embodiment is a type of brake device generally referred to as an “inner expansion drum brake”, and includes a brake drum (rotary body) 3 that rotates together with the vehicle 201 as shown in FIG. The main shoe 4 (main braking member) and the lock shoe 6 (auxiliary braking member) that generate a braking force by contacting the inner peripheral surface of the brake drum 3 and the main shoe 4 and the lock shoe 6 are supported in the brake drum 3. The back plate 5 is provided.

The brake drum 3 is fixed to a hub 202 positioned at the center of rotation of the vehicle 201 or a spoke 203 extending radially from the hub 202 (see FIG. 2).
More specifically, a circular base portion 3a fixed to the hub 202 or the spoke 203, and a peripheral wall 3b extending from the periphery of the base portion 3a toward the frame side of the wheelchair 200 when mounted on the wheelchair 200. The inner peripheral surface of the peripheral wall 3 b is a contact surface of the main shoe 4 and the lock shoe 6.

As shown in FIG. 3, the back plate 5 is made of a steel plate or the like having sufficient strength, and is attached between the frame of the wheelchair 200 and the vehicle 201.
More specifically, the axle is inserted through an axle insertion hole 5b formed at the center of the back plate 5, and in this state, the back plate 5 is fastened and fixed to the axle using a bolt 5c or the like. Further, main components constituting the brake device 1 are provided on the back plate 5 and inside the brake drum 3.

  The main components constituting the brake device 1 include a pair of main shoes 4 and 4 that contact the inner peripheral surface 3c of the brake drum 3 and exert braking force in both forward and reverse rotation of the brake drum 3; A return spring 13 that holds each main shoe 4, 4 at a position spaced from the inner peripheral surface 3 c of the brake drum 3, and only the rotation in the reverse direction of the brake drum by contacting the inner peripheral surface 3 c of the brake drum 3 is restricted. The lock shoe 6 that locks, the lock shoe return spring 7 that holds the lock shoe 6 at a position separated from the inner peripheral surface 3c of the brake drum 3, and the main shoe 4 and the lock shoe against the tension of the return springs 13 and 7 An actuating cam 8 that moves 6 to a position where a braking force is exerted can be exemplified.

  The pair of main shoes 4, 4 has an arcuate shape (arch) having a contact portion 4 a with the operating cam 8 at one end and a connecting hole 4 b for receiving an anchor pin 12 serving as a rotation center of the main shoe 4 at the other end. ) Main shoe main body 10 and a lining 11 which is a contact surface between the main shoe main body 10 and the brake drum inner peripheral surface 3c and is fixed to the main shoe main body 10 side. Each main shoe 4, 4 is rotatably attached to an anchor pin 12 provided near the lower side of the back plate 5 via the connection hole 4 b.

  That is, the main shoes 4, 4 are connected to each other via the anchor pin 12, and as the operating cam 8 rotates, the contact portion 4 a is used as a power point, and the brake pin is used as the fulcrum. The inner peripheral surface 3c is pressed to exert a braking force.

  The main shoes 4 and 4 are connected to each other by a return spring 13 and are held at a position separated from the inner peripheral surface 3c of the brake drum 3 in a normal state. Here, the normal state is a state in which the external force accompanying the rotation of the operation cam 8 is not acting on the main shoe 4. The operation of the main shoe 4 will be described in detail later.

  The lock shoe 6 includes a lock lining 60 that contacts and locks the inner peripheral surface 3c of the brake drum 3 and restricts the rotation of the brake drum 3, and a lock shoe main body 65 to which the lock lining 60 is fixed. Yes.

  The lock shoe main body 65 is formed of an arcuate flat plate whose full length is sufficiently longer than the shortest distance between the anchor pin 12 and the brake drum 3, and a lock lining 60 is fixed at one end and the lock shoe is fixed at the other end. A return spring 7 is connected.

  Further, between one end where the lock lining 60 is provided and the other end connected to the lock shoe return spring 7 and closer to the other end connected to the lock shoe return spring 7, it corresponds to a connecting portion with the anchor pin 12. A connecting hole 6a is provided. The lock shoe main body 65 is rotatably attached to the anchor pin 12 through the connection hole 6a.

  Further, a contact portion 6b with the operation cam 8 is provided in the vicinity of the end of the lock shoe main body 65 to which the lock lining 60 is fixed, and the lock shoe main body 65 rotates in accordance with the angle of the operation cam 8. Each time, the distance between the inner peripheral surface 3c of the brake drum and the lock lining 60 changes.

  Further, the lock shoe 6 is attached to the anchor pin 12 in a state where it is offset in the normal rotation direction from the line L extending from the brake drum 3 to the anchor pin 12. For this reason, when the brake drum 3 is reversely rotated and when the lock shoe 6 and the brake drum 3 are in contact with each other, the self-locking occurs, and a self-energizing effect is produced between the lock shoe 6 and the brake drum 3. Therefore, the reverse rotation of the brake drum 3 is forcibly restricted by the self-energizing effect. In this way, the lock shoe 6 restricts the reverse rotation of the brake drum 3.

  The lock shoe 6 is normally held at a position separated from the inner peripheral surface 3 c of the brake drum 3 by the tension of the lock shoe return spring 7. For this reason, in the normal state (the state where the lock shoe 6 is not in contact with the inner peripheral surface 3c of the brake drum 3), the occurrence of the self-energizing effect is prevented.

The actuating cam 8 includes an actuating cam portion 8a for the main shoe 4 that contacts the main shoe main body 10 at the contact portion 4a, and a lock further extended radially inward of the actuating cam portion 8a for the main shoe 4. And an operating cam portion 8b for the shoe 6.
Further, each of the operating cam portions 8a and 8b is connected to an operating lever 15 provided behind the back plate 5, and the operating cam portion 8a and the operating cam portion 8b rotate together with the operating lever 15 together. .

  An operating lever return spring 15 b is provided at the end of the operating lever 15. The operating lever return spring 15b is interposed between the return spring support arm 5a extended from the back plate 5 and the operating lever 15, and the operating lever 15 is always urged away from the return spring support arm 5a. ing.

  An operation cable 15 c is connected to the end of the operating lever 15. Further, as shown in FIG. 1, the operation cable 15 c is connected to the brake operation device 100 fixed to the assistant handle 204 behind the seat, and the operation lever 112 incorporated in the brake operation device 100 is operated. The operating lever 15 swings.

  Subsequently, the brake operation device 100, which will be described in detail with reference to FIGS. 9 to 12 and the like, includes a housing 110 (support member) fixed to the handle 204, and a support shaft provided in the housing 110. 111 (see FIG. 11), an operation lever 112 that is pivotally connected to the center, an operation restriction unit 120 for restricting the operation of the operation lever 112, and for restricting the operation lever 112 at a desired opening degree. A one-way clutch device 130 and a release device 140 for releasing the one-way clutch device 130 are provided as main components.

  The housing 110 is formed of a hard synthetic resin material or the like, and rises behind the seat, a main body 113 into which the operation lever 112 and the operation restricting portion 120 are incorporated, a first fixing portion 114 that is fitted around the base of the handle 204, and the like. And a second fixing portion 115 fixed to the vertical frame 205.

  Further, each of the fixing portions 114 and 115 will be described in detail. The first fixing portion 114 has a ring shape formed to have substantially the same diameter as the outer diameter of the handle 204, and the handle 204 is fitted into the handle 204 so that the handle 204 is attached to the inside. The first fixing part 114 is positioned. The second fixing portion 115 extends along the circumferential direction of the vertical frame 205 and is fixed to the vertical frame 205 using screws or the like.

  That is, the housing 110 is connected to the handle 204 by the first fixing portion 114, and is positioned by the second fixing portion 115 in the circumferential direction of the handle 204 and the axial direction of the handle 204.

  The operation lever 112 is rotatable about a support shaft 111 provided in the housing 110, and can be switched to three modes (operation positions) of “main brake mode”, “auxiliary brake mode”, and “brake release mode”. Is possible.

  First, the main brake mode is a mode in which a brake can be applied with a desired braking force when the wheelchair 200 moves forward and backward. When switching to the main brake mode, the braking force is applied by the main shoe 4 described above. Has been created.

  The auxiliary brake mode is a mode in which a brake is automatically applied when the wheelchair 200 moves backward, that is, when the vehicle 201 reverses. When the auxiliary brake mode is switched, the braking force is applied by the lock shoe 6 described above. Has been created.

  The brake release mode is a mode in which the brake does not act in any of forward and backward movements of the wheelchair 200, and both the main shoe 4 and the lock shoe 6 are connected to the inner periphery of the brake drum 3 when switching to the brake release mode. It is supported at a position separated from the surface 3c.

  The operation lever 112 is switched to the main brake mode when the brake release mode is set to the neutral position (initial position) and the operation lever 112 is grasped from the neutral position toward the handle 204. Further, when the operation lever 112 is pushed down in the direction away from the handle 204, the mode is switched to the auxiliary brake mode. That is, the operation mode can be switched to various modes by operating the operation lever 112.

  Further, in consideration of the matters described in the claims of the present invention, the position corresponding to the main brake mode corresponds to the third position. The position corresponding to the auxiliary brake mode corresponds to the second position. The position corresponding to the brake release mode corresponds to the first position.

  The brake operating device 100 shown in the present embodiment includes a pulling allowance adjusting device 150 for changing the pulling allowance of the operating lever 112 according to the operating force, in addition to the one-way clutch device 130 and the releasing device 140 thereof. ing.

  In addition, the movable range of the operation lever 112 is restricted by the operation restriction unit 120 incorporated in the housing 110 and the operation lever 112, and switching to each mode is possible when a deliberate operation is input to the operation lever 112. ing

<One-way clutch device>
First, the one-way clutch device 130 will be described with reference to FIGS.
The one-way clutch device 130 has a saw-like engagement tooth 131 that is fixed in the vicinity of the rotation center of the operation lever 112 and rotates together with the operation lever 112, and a claw 132a that meshes in one direction with the engagement tooth 131. A claw main body 132, a support shaft 133 that supports the claw main body 132 in a swingable manner with respect to the housing 110, and a spring 134 that biases the claw 132 a provided on the claw main body 132 against the engaging teeth 131. ing.

  The engaging teeth 131 are formed at positions where they can mesh with the claw main body 132 (claw 132a) when switching to the main brake mode. Rotation of the operation lever 112 is restricted.

  That is, when the engaging teeth 131 and the claw main body 132 are engaged with each other, only the operation of the operation lever 112 toward the handle 204 side that exerts a braking force, that is, the main brake mode side is allowed. It will be held (restrained) at the corresponding position. Therefore, thereafter, the braking force corresponding to the operation amount is maintained without operating the operation lever 112.

  In addition, an operation portion 145 of the release device 140 that releases the operation restriction by the one-way clutch device 130 is incorporated in the first fixing portion 114 of the housing 110.

  The other end of the claw body 132 is provided with a rod abutting portion 132b that abuts on the rod 146 extending from the operation portion 145. The claw body 132 is operated by operating the rod 146 extending from the operation portion 145 (up and down movement). It swings around the support shaft 133.

Further, as shown in FIGS. 14 and 15, the operation unit 145 includes a rod 146 that contacts the other end of the claw body 132, an operation knob 147 that is externally fitted to the handle 204 and can be operated in the circumferential direction thereof, The operation cam 148 provided integrally with the operation knob 147 and a protrusion 114a formed on the inner surface of the first fixing portion 114 are slidably deformed to give a feeling of moderation to the operation of the operation knob 147. An elastic body 149 is provided.

  Further, the operating state will be described. When the one-way clutch device 130 is not operated, the operating cam 148 is positioned on the upper end surface of the rod 146 (see FIG. 14), and the operating cam 148 causes the rod 146 to move to the other end of the claw body 132. That is, the rod contact portion 132b is pushed down. Therefore, the claw body 132 moves away from the engagement teeth 131, and the claw 132 a provided on the claw body 132 is disengaged from the engagement teeth 131.

  That is, when the operation knob 147 is not operated, the engagement teeth 131 and the claws 132a are disengaged, and the operator (assistant) can operate the operation lever 112 in any direction. Become.

On the other hand, when the one-way clutch device 130 is operated, the operating cam 148 is detached from the upper end surface of the rod 146 by operating the operation knob 147 in the circumferential direction of the handle 204 as shown in FIG. Is approaching the engagement tooth 131 side with the tension of the spring 134 and meshes with the engagement tooth 131 again.
Therefore, in this state, only the operation of the operation lever 112 toward the handle 204 side that exerts a braking force is allowed.
When the operation knob 147 is operated, the elastic body 149 is deformed by the protrusion 114a and is restored after getting over the protrusion 114a, thereby holding the operation knob 147 in the rotating position. As a result, the forward / backward position of the rod 146 can be prevented from staying halfway, and the possibility that the claw 132a and the engaging tooth 131 are incompletely engaged and damaged is eliminated.

<Driving allowance adjustment device>
Next, the drawing allowance adjusting device 150 will be described with reference to FIGS. 16 and 17.
The pulling allowance adjusting device 150 is accommodated in a case main body 151 connected to an operation cable 15c extending from the operating lever 15 of the brake device 1 and an accommodating portion 152 provided in the case main body 151 and extending in the axial direction of the case main body 151. The coil spring 153, the actuating plate 154 accommodated in the accommodating part 152 and biased toward the actuating lever 15 by the coil spring 153 in the accommodating part 152, and one end of the actuating plate 154 passing through the inside of the coil spring 153. The connecting cable 15d is connected to the operation lever 112 at the other end.

  Further, an appropriate set load is applied to the coil spring 153, and an appropriate tension (tension) is always applied to the connecting cable 15d connected to the operation lever 112.

  When the operation lever 112 is operated to the main brake mode side under the set load of the coil spring 153, the case main body 151 moves to the operation lever 112 side with the movement of the connecting cable 15d. As the case body 151 moves, the operating lever 15 is also pulled toward the operation lever 112 side.

Further, when the operation lever 112 is further grasped from this state, the coil spring 153 in the case body 151 contracts as shown in FIG. 17, and a stroke corresponding to the amount of bending of the coil spring 153 is given to the operation lever 112.
In this way, when the operating force exceeds the set load of the coil spring 153, the moving amount of the connecting cable 15d can be secured larger than the moving amount of the operating cable 15c connected to the operating lever 15, and as a result, the operating lever 112 can be operated. The amount increases.

  Therefore, even if the engaging tooth 131 and the claw 132a are in a position where it is difficult to engage, if the operation lever 112 is grasped with an operating force exceeding the set load of the coil spring 153, the claw 132a engages with another adjacent engaging tooth 131. Therefore, the meshing state of the engaging teeth 131 and the claws 132a can be obtained more reliably.

<Operation regulation part>
Next, the operation restriction unit 120 will be described.
As shown in FIG. 11, the operation restricting portion 120 includes a stopper 122 (contact member) incorporated in a stopper accommodating portion 121 formed in the main body portion 113 of the housing 110, and the stopper 122 inside the stopper accommodating portion 121. A spring 123 (biasing means) that urges toward the operation lever 112 from one side, and a protrusion 124 (operation regulating member) that is formed on the operation lever 112 and contacts the stopper 122 on the housing 110 side when operating in the brake release mode. And.

  Further, since the operating lever 112 is urged in the direction from the main brake mode to the auxiliary brake mode via the brake release mode by the tension of the operating lever return spring 15b, the operating lever 112 is in a normal state (when the operating lever is not operated). ), The projecting portion 124 of the operation lever 112 is in contact with the stopper 122 due to the external force accompanying this biasing, and the contact position between the projecting portion 124 and the stopper 122 is the neutral position of the operation lever 112. Brake release mode positioning has been performed.

  Thus, in the brake operating device 100 shown in the present embodiment, the external force that accompanies urging and the reaction force that opposes this external force are applied to the operating lever 112, and the brake release mode is achieved by balancing these two forces. The operation lever 112 is positioned at the position.

  Next, the operation of each component described above will be described with reference to FIGS. FIG. 3 shows an operating state of the brake device 1 corresponding to the main brake mode. FIG. 4 illustrates an operation state of the operation lever 112 corresponding to the main brake mode. FIG. 5 shows the operating state of the brake device 1 corresponding to the brake release mode. FIG. 6 illustrates an operation state of the operation lever 112 corresponding to the brake release mode. FIG. 7 shows the operating state of the brake device 1 corresponding to the auxiliary brake mode. FIG. 8 illustrates an operation state of the operation lever 112 corresponding to the auxiliary brake mode.

<Main brake mode: When the one-way clutch device is not operating>
First, an operation method of the operation lever 112 when the one-way clutch device 130 is not operated will be described.
When the one-way clutch device 130 is not operated, the operation lever 112 is rotated in the direction of arrow A (clockwise) in FIG. 4 by grasping the operation lever 112 with the handle 204 (arm) as a fulcrum, and the operation amount (the rotation amount) The braking force according to) is obtained. When the operation is loosened, the operating lever 112 returns to the direction of arrow A ′ (counterclockwise direction) in FIG. 4 due to the tension of the operating lever return spring 15b, and the braking force decreases.

The operation of each component of the brake device 1 is as follows.
First, when the operating lever 112 is grasped to apply a brake, the operating cam portion 8a rotates to a position corresponding to the amount of operation (arrow N direction in FIG. 3: counterclockwise direction). Further, each main shoe 4, 4 is pressed against the inner peripheral surface 3 c of the brake drum 3 with a pressing force according to the operating angle of the operating cam portion 8 a, and a braking force is exhibited.

  On the other hand, when the operation is loosened, the operating cam portion 8a returns in the direction of arrow R (clockwise direction) in FIG. 3 due to the tension of the operating lever return spring 15b and the return spring 13, and the main shoes 4, 4 are brake drums. The brake is released away from the inner peripheral surface 3c.

  In the main brake mode, the operation cam portion 8b for the lock shoe 6 rotates in the direction indicated by the arrow Y in FIG. 3, so that the lock shoe 6 is driven by the tension of the lock shoe return spring 7 to the inner peripheral surface of the brake drum 3. It is held at a position further away from 3c. For this reason, in the main brake mode, the braking force by the lock shoe 6 cannot be obtained.

<Main brake mode: When the one-way clutch is operating>
Next, an operation method of the operation lever 112 when the one-way clutch device 130 is operated will be described.
When the one-way clutch device 130 is operated, as shown in FIG. 12, only the operation of the operation lever 112 toward the handle 204 side that exerts a braking force is allowed by the action of the one-way clutch device 130 (in the direction of arrow A in FIG. 12). . The operation lever 112 is held at an angle corresponding to the operation amount by meshing with the claw body 132 (claw 132a).

  Therefore, thereafter, the braking force corresponding to the operation amount is maintained until the operation restriction by the one-way clutch device 130 is released. For this reason, for example, when traveling on a downhill, it is possible to go down a slope while suppressing acceleration of the wheelchair 200. It can also be used as a parking brake on flat ground.

The operation of each component crystal of the brake device 1 is as follows.
First, when the operating lever 112 is grasped, the operating cam portion 8a rotates in the direction of arrow N (counterclockwise direction) in FIG. 3 so that the main shoes 4 and 4 are pressed against the inner peripheral surface 3c of the brake drum 3 and the brake is applied. It takes.

  On the other hand, when the operation on the operation lever 112 is loosened, the angle of the operation lever 112 is maintained by the function of the one-way clutch device 130, and the braked state is maintained thereafter.

<Brake release mode>
In the brake release mode, as shown in FIG. 6, the protruding portion 124 of the operating lever 112 is in contact with the stopper 122 which is one component of the operation restricting portion 120, and the operating lever 112 has the stopper 122 and the protruding portion 124. Is maintained at the neutral position P. Similarly, the operating cam portion 8a is also maintained at the neutral position, and each main shoe 4 is maintained at a position separated from the brake drum inner peripheral surface 3C by the tension of the return spring 13.

  Similarly to the main brake mode, the lock shoe 6 is also constrained by the lock shoe return spring 7, and the brake does not act even when the wheelchair 200 moves backward. Thus, in the brake release mode, each main shoe 4 and the lock shoe 6 are held in a state of being separated from the inner peripheral surface of the brake drum 3, so that the brake can be applied in both the forward and reverse directions of the wheelchair 200. Will not work.

<Auxiliary brake mode>
In order to switch to the auxiliary brake mode, the operation lever 112 is further pushed down from the brake release mode to switch to the auxiliary brake mode. At this time, the protruding portion 124 of the operating lever 112 that is in contact with the stopper 122 gets over the stopper 122 as the operating lever 112 is forced to rotate, and the positioning of the operating lever 112 by the operation restricting portion 120 is released. .

  At the same time, since the tension of the operating lever return spring 15b acts on the operating lever 112, the operating lever 112 is further pulled downward. Then, it comes into contact with the main body 113 of the housing 110 (see the point X in FIG. 8) and is positioned.

The operation of each component of the brake device 1 is as follows.
First, the actuating cam portion 8 b rotates in the direction of arrow K (clockwise direction) in FIG. 7 to bring the lock shoe 6 into contact with the inner peripheral surface 3 c of the brake drum 3.

When the brake drum 3 rotates in the reverse rotation direction, the lock shoe 6 is self-locked, and a self-energizing effect is generated between the lock shoe 6 and the brake drum 3, and the reverse rotation of the brake drum 3 is restricted.
In a situation where the wheelchair 200 moves forward and the vehicle 201 rotates forward, the brake drum 3 also rotates forward, so that the self-locking state of the lock shoe 6 is released and the vehicle can move forward.

  That is, even when the vehicle 201 is rotating forward in the auxiliary brake mode, the contact state between the lock shoe 6 and the brake drum inner peripheral surface 3c is maintained. Since the energizing effect is not exhibited, the braking force by the lock shoe 6 does not act on the brake drum 3.

  When the operation lever 112 is switched to another mode, the operating cam portion 8b rotates in the direction of arrow D in FIG. 7, so that the lock shoe 6 is again brought into the brake drum by the tension of the lock shoe return spring 7. It returns to a fixed position separated from the peripheral surface 3c. Therefore, the braking force by the lock shoe 6 is not exhibited.

  Thus, in the brake device 1 shown in the present embodiment, the brake release mode that allows the rotation of the brake drum 3 in both the forward and reverse directions and the rotation of the brake drum 3 are restricted only in the reverse direction. An operating lever 112 is provided that is operable in a movable range including an auxiliary brake mode and a main brake mode that restricts rotation of the brake drum 3 in both forward and reverse directions.

  Further, the operating lever 112 is normally biased in the direction from the brake release mode to the auxiliary brake mode. In addition, an operation restricting unit 120 that restricts the movement of the operation lever that contacts the operation lever 112 in the brake release mode and reaches the auxiliary brake mode is provided. That is, the operation lever 112 is in contact with the operation restricting portion 120 due to an external force accompanying urging, and positioning in the brake release mode is performed with this contacted state.

  As described above, in this configuration, the external force accompanying the urging and the reaction force against the external force are applied to the operation lever 112, and the operation lever 112 is positioned by balancing these two forces. Therefore, since the external force is always applied to the operation lever 112, the operation lever 112 can be positioned more reliably than the positioning depending on the engagement. Further, there is no need for a guide groove for engagement, and various specifications can be easily accommodated by changing the abutting location or the like.

In the present embodiment, a stopper 122 (contact member) and a spring 123 (biasing means) are provided on the housing 110 side, and a protruding portion 124 that is an operation restricting member is provided on the operation lever 112 side. Both positions can be changed, and a stopper 122 and a spring 123 may be provided on the operation lever 112 side, and a protrusion 124 may be provided on the housing 110 side.

  In addition, for example, when the stroke amount or the neutral position of the operating lever 15 changes due to the specification change of the brake device 1, the length is adjusted (play adjustment) of the operation cable 15 c, and the projecting portion 124 is changed. Each specification change can be easily accommodated by replacing the lever with a different shape and position.

  Further, the position, angle, etc. of the engagement tooth 131 as one component of the one-way clutch device 130 can be changed along with the specification change of the brake device 1. If the engagement teeth 131 are fixed to the operation lever 112 with screws or the like, the position of the engagement teeth 131 can be changed and the angle can be adjusted by loosening the screws.

  In the above-described embodiment, the operation device 100 according to the present invention has been described by taking the brake device 1 for the wheelchair 200 as an example. However, the operation device 100 is not limited to a wheelchair, for example, a stroller, a bicycle, a carriage, and an industrial device. It can also be applied to machines, motorcycles, automobile brakes, etc.

  In the present embodiment, the operation device is attached to the assistant handle 204 behind the seat as the operation device for the assistant. However, the attachment position can be arbitrarily changed. When it is provided on the handrail (arm) that extends, the rider of the wheelchair 200 can travel by operating the operation lever 112.

The side view of the wheelchair with which the brake device which concerns on this Embodiment was attached. The perspective view which shows the state which fixed the brake drum which concerns on this Embodiment to vehicle transportation. The figure for demonstrating the operating state of each component crystal | crystallization in the main brake mode of the brake device shown to this Embodiment. The figure which shows the position (operation state) of the operation lever corresponding to the main brake mode. The figure for demonstrating the operating state of each component in the brake release mode of the brake device shown to this Embodiment. The figure which shows the position (operation state) of the operation lever corresponding to brake release mode. The figure for demonstrating the operating state of each component in the auxiliary | assistant brake mode of the brake device shown to this Embodiment. The figure which shows the position (operation state) of the operation lever corresponding to auxiliary brake mode. The side view of the operating device shown in this Embodiment. The figure which looked at the operating device which shows this Embodiment from the wheelchair front side. The schematic block diagram which shows the internal structure of the operating device shown in this Embodiment. The figure which switched from the brake release mode shown in FIG. 11 to the main brake mode. The principal part enlarged view of the one-way clutch apparatus integrated in the operating device shown in this Embodiment. The figure for demonstrating the position of the operation part corresponding to the time of non-operation (at the time of cancellation | release) of a one-way clutch apparatus. The figure for demonstrating the position of the operation part corresponding at the time of the action | operation of a one-way clutch apparatus. The figure which shows the non-operation state of the drawing allowance adjusting apparatus which concerns on this Embodiment. The figure which shows the operation state of the drawing allowance adjusting apparatus which concerns on this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brake device 3 Brake drum 3a Base part 3b Peripheral wall 3c Inner peripheral surface 4 Main shoe 4a Contact part 4b Connection hole 5 Back plate 5a Return spring support arm 5b Axle insertion hole 5c Bolt 6 Lock shoe 6a Connection hole 6b Contact part 7 Lock shoe return Spring 8 Actuation cam 8a Actuation cam portion 8b Actuation cam portion 10 Main shoe main body 11 Lining 12 Anchor pin 13 Return spring 15 Actuation lever 15b Actuation lever return spring 15c Operation cable 15d Connection cable 60 Lock lining 65 Lock shoe main body 100 Brake operation device 110 Housing 111 Support shaft 112 Operation lever 113 Body portion 114 First fixing portion 115 Second fixing portion 120 Operation restricting portion 121 Stopper accommodating portion 122 Upper part 123 Spring 124 Protruding part 130 One-way clutch device 131 Engaging tooth 132 Claw body 132a Claw 132b Rod contact part 133 Support shaft 134 Spring 140 Release device 145 Operation part 146 Rod 147 Operation knob 148 Operation cam 149 Elastic body 150 Pull allowance Adjusting device 151 Case body 152 Housing portion 153 Coil spring 154 Actuating plate 200 Wheelchair 201 Wheel 202 Hub 203 Spoke 204 Supporter handle 205 Vertical frame P Neutral position of the operation lever

Claims (7)

An operating device for a brake device that restricts rotation of a rotating body,
A first position that allows normal rotation and reverse rotation of the rotating body and a second position that restricts only one of forward rotation and reverse rotation of the rotating body, and is operably supported within a movable range; And an operation lever biased from the first position toward the second position in a normal state;
An operation restricting portion that abuts the operation lever at the first position and restricts the movement of the operation lever to reach the second position;
An operating device comprising: A support member that operably supports the operation lever;
The support member includes a contact member that can contact the operation lever, and an urging unit that urges the contact member toward the operation lever.
The operation lever is provided with an operation restricting member that contacts the contact member at the first position and restricts the movement of the operation lever to the second position. The operating device according to 1. In a position different from the second position, a third position for restricting both forward and reverse rotation of the rotating body is provided, and the operation lever is in the normal state.
The operating device according to claim 1, wherein the operating device is biased in a direction from the third position to the second position via the first position. The brake device includes: a main braking member that restricts normal rotation and reverse rotation of the rotating body; and an auxiliary braking member that contacts the rotating body and self-locks when the rotating body reverses, and restricts the reverse rotation of the rotating body; An operation cam for individually operating the main braking member and the auxiliary braking member following the operation on the operation lever,
When the operation lever is operated from the first position toward the third position, the operation cam is operated so that the main braking member is pressed against the rotating body with a pressing force corresponding to the operation amount.
4. The operating device according to claim 3, wherein when the operating lever is operated at the second position, the operating cam is operated so that only the auxiliary braking member contacts the rotating body. 5.   The one-way clutch device that allows only the operation of the operation lever from the first position toward the third position, and a release device that releases the operation restriction by the one-way clutch device. 4. The operating device according to 4. An operating device for a brake device that restricts rotation of a rotating body,
An operation lever for applying a braking force corresponding to the operation amount to the rotating body when operated in a predetermined direction;
A one-way clutch device that allows only the operation of the operation lever toward the predetermined direction and holds the operation lever at a position corresponding to the operation amount;
A release device for releasing the operation restriction of the operation lever by the one-way clutch device;
When operating the operation lever toward the predetermined direction, an operation unit for operating the release device provided on an arm extending to a position where the operation lever can be held together with the operation lever;
An operating device comprising: The operation device according to claim 6, wherein the operation unit provided in the arm is provided to be operable in a circumferential direction of the arm.

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