JP2000072073A - Electric bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely fix an attachable/detachable battery case to a bicycle body frame with simple constitution. SOLUTION: A key cylinder 70 to be operated by a key K is provided on a support bracket 7 provided on a bicycle body frame, and a lock plate 8 to be turned therewith is fitted to a lower end of the key cylinder 7. A roller is fitted to a front wall of the battery case 6 opposite to the support bracket 7 when fitted to the bicycle body frame, the roller is turned and abutted on a lower surface of the lock plate 8 projected on the battery case 6 side, and the battery case 6 is constrained so as not to be detached when pulled upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric bicycle provided with an electric motor for assisting manual driving by pedaling force, and more particularly to a battery mounted on a part of a vehicle body frame for supplying power to the electric motor. The present invention relates to an electric bicycle including means for locking a battery case in which is stored a battery case.

[0002]

2. Description of the Related Art In an electric bicycle, an electric motor is attached to a drive system of a rear wheel, which is a traveling wheel, and the rotational force of the electric motor is transmitted to a rear wheel hub via an appropriate transmission such as a belt or gear. In addition, the original running of the bicycle performed by the pedaling force is assisted by the rotational force of the electric motor, and when starting, reducing the human load on the user when traveling uphill, etc. In recent years, it has been in the limelight as a possibility.

In this type of electric bicycle, a rechargeable battery for supplying power to the electric motor is mounted. Since this battery becomes a bulky heavy object,
In order to maintain the balance of the vehicle body without hindering the driving operation, it is housed in a long case made of synthetic resin or the like and attached to a part of the vehicle body frame. Further, Japanese Patent Application Laid-Open No. 10-59244 (B62J 11/00, B62M 23/0
As disclosed in 2) and the like, in many electric bicycles, the battery case is made detachable so that charging after discharging is completed can be detached from a vehicle body frame to improve usability.

In the electric bicycle disclosed in Japanese Patent Application Laid-Open No. 10-59244, a battery is provided on a main pipe connecting a vertical pipe at the center of the vehicle body supporting the saddle and a head pipe at the front of the vehicle body supporting the front wheels. The case is attached. This mounting is based on a flat battery base fixed along the main pipe along the base, and the rear end of the battery case is engaged with an engaging portion provided at the rear of the battery base while the battery case is engaged. A front wall of the case is opposed to a support bracket provided at a front portion of the battery stand, and a lock pin extending from the support bracket is fitted into a fitting hole formed in the front wall. To remove the battery case, the lock pin is retracted, the fitting with the fitting hole is released, and then the front part of the battery case is pulled up to disengage the rear end while tilting the battery case. It is performed according to the procedure.

[0005] According to this configuration, the battery case can be attached and detached, and the battery case can be securely fixed at the time of attachment to prevent displacement and dropping due to vibration during traveling. A handle is provided at the front of the battery case, and when the battery is pulled up for removal and carried after removal, the handle is gripped.

In order to attach and remove the battery case, it is necessary to move the lock pin forward and backward, and it is possible to prevent malicious removal and to prevent the battery case from being stolen. In addition, the operation of moving the lock pin is performed by inserting a key into an operation unit provided on the support bracket and rotating the key, so that the theft of the battery case can be more reliably prevented.

[0007]

However, Japanese Patent Application Laid-Open No. 10-5
In the battery case attaching / detaching structure disclosed in Japanese Patent Application Publication No. 9244, a mechanism is required to convert the rotational movement caused by the operation of the key into a linear movement for moving the lock pin forward and backward. There is a problem that a supporting part for supporting the member without displacement is required, and the configurations of the conversion mechanism and the supporting part are complicated, so that the size of a supporting bracket provided with these parts cannot be avoided.

Further, since the lock of the battery case is performed by fitting the lock pin that moves forward into the fitting hole in the front part of the battery case, if the fitting gap between the two is set small, the two will not be attached when the battery case is mounted. There is a problem that it is necessary to accurately position the battery case, and it takes time and effort to mount the battery case. If the fitting gap is set to be large to solve this problem, the front portion of the battery case after mounting is within the range of the fitting gap. In this case, there is a problem that the position is displaced and a reliable fixing state cannot be obtained.

The present invention has been made in view of such circumstances, and a detachable battery case can be securely fixed to a vehicle body frame with a simple configuration, and the operation for fixing is easy. It is an object to provide an electric bicycle having a lock structure.

[0010]

An electric bicycle according to the present invention is configured such that a battery case containing a battery is detachably attached to a body frame by pulling a predetermined portion.
In an electric bicycle configured to drive an electric motor by power supply from the battery case, a lock rotatably supported by a part of the vehicle body frame or the battery case in a plane intersecting the direction of the pulling. And a plate provided on the battery case or the vehicle body frame in correspondence with the lock plate. The plate is brought into contact with one surface of the lock plate protruding to the same side by the rotation so that the battery case is unremovably restrained. It is characterized by comprising a contact portion and operating means for rotating the lock plate.

In the present invention, the lock plate attached to a part of the vehicle body frame or the battery case is rotated in a plane intersecting with the pulling direction of the battery case at the time of removal by rotating operation of the operating means. One surface of the lock plate comes into contact with a contact portion provided on the battery case or the body frame, and the battery case is detachably restrained. The lock plate is fixed to a shaft which is turned by operation of the operation means. No complicated mechanism is required for the operation of the lock plate, and the lock is securely restrained with a simple configuration.

Further, the battery case is sandwiched between a pair of frame members in a vehicle width direction, and is configured to be removed by being pulled upward.

In the present invention, the battery case includes:
The battery case is sandwiched between a pair of frame members in the vehicle width direction, and is removed by pulling up. Therefore, the movement of the battery case in the left and right direction is restrained by the frame member, and the movement in the vertical direction is restrained by the lock plate. The battery case is securely fixed.

[0014] A connection portion for supplying power from the battery case to the electric motor may be provided near a contact position between the lock plate and the contact portion.

In the present invention, when the lock state is obtained by the contact of the lock plate with the contact portion, the output terminal inside the battery case is provided at a position corresponding to the vehicle body frame near the contact portion. It is securely connected to the power supply terminal,
Power is reliably supplied from the battery case to the electric motor through this connection.

A click plate which rotates together with the lock plate and has a recess formed on the outer periphery thereof; and a spring piece mounted on the vehicle body frame or the battery case and elastically contacting the outer periphery of the click plate. Features.

According to the present invention, when the lock plate is rotated to obtain a contact state with the contact portion, the spring piece is engaged with the concave portion formed on the outer periphery of the click plate which rotates together with the lock plate. Then, a click feeling is transmitted to the user who operates the operation means, and it is sensed that the locked state is obtained.

[0018] Further, the invention is characterized in that a part of the lock plate is provided with a concave portion which engages with a part of the contact part when it is at a predetermined rotation position.

In the present invention, when the lock plate is rotated to obtain a contact state with the contact portion, the concave portion formed in the lock plate is engaged with a part of the contact portion to operate the operating means. A click feeling is transmitted to the user who operates, and it is sensed that the locked state has been obtained.

Further, the contact portion is constituted by a roller rotatably supported around an axis intersecting with a pivot shaft of the lock plate.

According to the present invention, the contact portion that comes into contact with the lock plate is a roller, and is rotated by rolling contact with one surface of the lock plate that is rotated by operating the operating means, so that a smooth contact state is obtained. .

Further, the operating means is configured to be operated by a key, and the operating means also serves as a key switch for interrupting power supply from the battery case to the electric motor.

According to the present invention, the operation of rotating the lock plate is performed by a key, so that the battery case cannot be removed without the key, thereby preventing the battery case from being stolen. In addition, the operation means using keys is also used as a key switch for interrupting power supply from the battery case, thereby simplifying the configuration.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a side view showing the entire configuration of the electric bicycle according to the present invention. The electric bicycle includes a vehicle body frame 1 supported by front and rear wheels 2 and 3 at the front and rear thereof. The body frame 1 supports a seating saddle 4 at an upper part thereof, and a standing pipe 10 provided with human-powered pedals 5 and 5 at a lower part thereof, and a head pipe 11 supporting the front wheels 2. The main pipes are connected by two main pipes 12 and 13 (only one side is shown) arranged side by side in the direction.

The front wheel 2 is attached to a lower end of a support fork 40 inserted and supported by the head pipe 11 so as to be rotatable about an axis. A bar-like steering handle 41 is fixed to the upper end of the support fork 40 extending above the head pipe 11 so as to be substantially perpendicular to the support fork 40.
The operation of 41 changes the direction of the support fork 40 to steer the front wheel 2.

The rear wheel 3 protrudes from the rear side of the upright pipe 10 and is supported from both sides in the vehicle width direction by a back fork 14 and a chain stay 15 framed in a triangular shape together with the upright pipe 10. . The electric motor M for driving assistance is mounted on a hub plate 30 fixed to the rear end of the back fork 14 and the chain stay 15 coaxially with the rear wheel 3, and a belt built in the hub plate 30. , And a transmission means such as a gear, and is connected to a hub shaft (not shown) serving as a rotation shaft of the rear wheel 3.

A rear gear (not shown) is attached to the end of the hub axle of the rear wheel 3 which protrudes from the side shown in FIG.
On the other hand, a front gear 50 that is paired with the rear gear is rotatably supported at the lower end of the standing pipe 10, and a chain C is stretched between the front gear 50 and the rear gear. . Front gear 50 protruding on both sides in the vehicle width direction
The pedals 5, 5 are attached to the ends of the rotary shafts via separate cranks having a phase difference of 180 °.

With the above configuration, the front gear 50 is
The user is seated on the saddle 4 and is rotated by the pedaling force of the pedals 5, 5, and this rotation is transmitted to the rear wheel 3 via the chain C and the rear gear, and the rear wheel 3 is rotated to perform manual driving. The electric motor M is driven by a driving force substantially equal to human power, and the rotational force of the electric motor M is transmitted to the rear wheels 3 via a transmission mechanism built in the hub plate 30, and the electric motor M is driven as described above. Assisted human power running.

The rotational torque applied to the rear wheel 3 by the pedaling force of the pedals 5, 5 is detected by a torque sensor (not shown) built in the hub plate 30, and the electric motor M
Is controlled so as to obtain a rotational torque equal to the torque detected by the torque sensor, that is, a rotational torque equal to the pedaling force of the pedals 5 and 5 by the user. As a result, the electric motor M is driven in a traveling state in which a large pedaling force is applied to the pedals 5 and 5, such as when traveling uphill or starting, as well as during normal traveling, so that traveling by human power is assisted and light traveling is performed. It becomes possible.

The feature of the electric bicycle according to the present invention lies in the mounting structure of the battery case 6 containing a battery for supplying power to the electric motor M driven as described above. As shown in FIG. 1, the battery case 6 is a long box detachably mounted on a pair of left and right main pipes (frame members) 12, 13 provided between a standing pipe 10 and a head pipe 11. A handle that is attached to the upper part of the front end of the body
The handle 6a is pulled up, gripped and pulled up, and is removed. Conversely, the handle 6a is gripped and pushed down to be attached as described later. FIG. 2 shows a state where the battery case 6 is attached and detached.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1 and shows a state in which the battery case 6 is supported. As shown in the figure, the battery case 6 is constituted by arranging a plurality of cylindrical batteries B, B,... In two rows and storing them vertically, and covering their upper parts with a cover plate 60. , B ... are stored in the main pipe 12,
13 and a pair of support flanges 61, 61, which are provided on the upper and outer sides of the main pipes 12, 13, are provided on the main pipes 12, 13, and these support flanges 61, 61 are used as supports, and the batteries B, The storage section B is sandwiched between the main pipes 12 and 13, and is supported by restraining movement in the left-right direction.

The main pipes 12 and 13 are made of pipes having an oval cross section whose vertical dimension is longer than that in the horizontal direction and whose strength against vertical force is increased. . Can be firmly supported by the battery case 6 which becomes a heavy object by storing. In FIG. 3, the handle used when attaching / detaching the battery case 6 is shown.
6a, the handle 6a is pivotally supported at its base by support pins 6b, 6b which are coaxially provided on the left and right side walls of the upper lid 60, and these support pins 6b, 6b are pivoted. The swing is caused as shown in FIG.

Further, a power supply cord 16 for guiding the power supply from the battery case 6 to the electric motor M is attached below the main pipe 12 on one side, and a power supply cord 16 below the main pipe 13 on the other side. brake wire W ₁ and shift wire W ₂ for operating the brake and shift system mounted to the rear wheel 3 is attached. As shown in FIGS. 1 and 2, the power supply cord 16 includes a main pipe 12 and a back fork.
It is extended rearward along 14 and guided to the inside of a hub plate 30 attached to the rear wheel 3 and connected to an electric motor M for driving assistance via a drive circuit (not shown).

As described above, the battery case 6 mounted and supported on the main pipes 12 and 13 is provided in front of the main pipes 12 and 13.
The vertical and forward and backward movements are restricted by a support bracket located at the rear and installed between the two. FIG.
FIG. 4 is a plan view of the main pipes 12, 13 showing a state where the battery case 6 is removed. As shown in the figure, near the rear ends of the main pipes 12 and 13 connected to the upright pipe 10, the rear pipe is suspended between the two main pipes 12 and 13 while the rear side is supported by the upright pipe 10. The support bracket 17 is fixed.

In the vicinity of the front ends of the main pipes 12 and 13 connected to the head pipe 11, a front support bracket 7 is fixedly mounted so as to be bridged therebetween. The support bracket 7 is provided with a lock plate 8 for restraining the battery case 6 and power supply terminals 9 and 9 for taking out output from the battery case 6. (See FIGS. 1, 2, 5, and 6).

The battery case 6 is carried by gripping the handle 6a attached to the front portion, and engages with the support bracket 17 from below with an engagement projection (not shown) projecting from the rear end thereof. In this state, it is inserted between the main pipes 12 and 13 and tilted forward, and is placed on the main pipes 12 and 13 with its front end facing the rear side of the support bracket 7, and The lock plate 8 provided is non-removably restrained and attached by an operation described later.

FIG. 5 is an enlarged side sectional view showing the vicinity of a support bracket 7 for supporting the front portion of the battery case 6, FIG. 6 is a view taken along the line VI-VI of FIG. 5, and FIG. V in FIG.
It is a cross-sectional view by the II-VII line. As shown in FIG. 5, the support bracket 7 has a U-shaped side provided with an upper plate 7a and a lower plate 7b along the upper and lower edges of the main pipes 12, 13, respectively, and a connecting plate 7c connecting these front ends. It has a cross section.

A key cylinder 70, which is rotated by a key K inserted into the upper part of the upper plate 7a, is mounted with its rotation axis in the vertical direction, that is, in the direction in which the battery case 6 is pulled up. At the lower end of the key cylinder 70 protruding from the lower part of the upper plate 7a, a rotation about the axis of the key cylinder 70 in response to the rotation operation of the key K, that is, a direction orthogonal to the pulling direction of the battery case 6 The lock plate 8 is attached so as to be rotatable in a plane to be locked. Support bracket 7
As shown in FIG. 4, the lower plate 7b extends rearward of the upper plate 7a in a suitable length in plan view, and has a rod-shaped power supply terminal 9, substantially perpendicular to the upper surface thereof. 9 is protruded so that it can be seen from above.

As shown in FIGS. 5 and 6, the upper part of the key cylinder 70 is exposed above the outer cover 18 so that the key K can be inserted.
Can be rotated between three switching positions shown in FIG. 6, namely, "detachable", "on", and "off". FIG. 6
Reference numerals 19, 19, and 19 indicate LEDs for displaying the remaining battery power.

As shown in FIG. 7, the lock plate 8 is a plate member having a fan-shaped plane shape, and the center thereof is
The rotary shaft is fixed to the lower end of the rotary shaft, and is rotated within the range of the rotation angle indicated by the two-dot chain line in the figure in accordance with the rotation operation of the key K performed between the three switching positions described above. It is done so. The turning position of the lock plate 8 indicated by a solid line in the drawing is when the key K is at the “on” switching position, and in this case and when the key K is at the “off” switching position. The distal end of the outer cover 18 protrudes outward through a long hole 18a formed through the rear wall of the outer cover 18, and retreats into the outer cover 18 when it is at the "removable" switching position.

On the other hand, in the front half of the semicircular lock plate 8, a click plate 80 having three recesses formed on its outer periphery is provided.
The base of the click plate 80 is fixed to the inner surface of the connection plate 7c of the support bracket 7, and a resin spring piece having elasticity in the front-rear direction is formed on the outer periphery of the click plate 80.
81 are in contact. The recesses on the outer periphery of the click plate 80 are formed so as to correspond to the three switching positions of "removal,""on," and "off," respectively, and these recesses provide the corresponding switching positions. When engaged, it engages with the tip of the spring piece 81. Thereby, the key K operated at the upper part of the outer cover 18 is given a click feeling associated with the engagement, and it is possible to reliably detect that the three switching positions have been realized.

As shown in FIG. 7, the front wall of the battery case 6 which faces the rear wall of the support bracket 7 by the mounting described above has an arc shape along the rotation locus of the lock plate 8 projecting to the same side. A recess 62 is provided, and approximately at the center of the recess 62,
A roller 63 is rotatably supported around a support shaft projecting forward in the rotation plane of the lock plate 8, and the roller 63 is, as shown in FIG. At the switching position of "OFF", it comes into contact with the lower surface of the lock plate 8 projecting to the same side.

When such a contact state is obtained, the front portion of the battery case 6 is pressed from above by the lock plate 8, and the battery case 6 is restrained from being removed by pulling up the front portion. Is done. In the above embodiment, the contact portion of the battery case 6 that contacts the lock plate 8 is configured by the roller 63 that rotates about an axis substantially orthogonal to the key cylinder 70 that is the rotation axis of the lock plate 8. Since the roller 63 rotates while rolling on the lower surface with the rotation of the lock plate 8, the contact state described above is smoothly realized, and a reliable locked state is obtained. The contact portion on the battery case 6 side is not limited to the roller 63, and may be configured as a concave portion provided at a corresponding position on the front surface of the battery case 6, or a convex portion protruding from the corresponding position.

On the other hand, when the key K is operated to the “removable” switching position, the lock plate 8 retreats into the outer cover 18 of the support bracket 7, disengages from the rollers 63, and The restraint is released. Therefore, when the handle 6a is raised in this state and the handle 6a is gripped and pulled up, the battery case 6 can be removed from the front side.

An output terminal (not shown), which is configured to have elasticity by a leaf spring or the like, is provided inside the front lower portion of the battery case 6 which is restrained by the lock plate 8. When the battery case 6 is attached, these output terminals are in elastic contact with the power supply terminals 9 projecting from the lower plate 7b of the support bracket 7 and entering the inside of the battery case 6 so as to be able to conduct with them. It is made to be connected.
This connection position is in the vicinity of the contact position between the lock plate 8 and the roller 63, and the connection is reliably performed without fear of displacement.

As shown in FIG. 5, a magnet 82 is attached to a lower portion of the lock plate 8, and a switch board 83 is arranged to face the magnet 82. A reed switch (not shown) interposed between the power supply terminals 9 and 9 and the power supply cord 16 is attached to the switch board 83. In this reed switch, the lock plate 8 corresponds to the "ON" position. When it is in the rotation position, it turns on in response to the magnet 82, and similarly, when it is in the rotation position corresponding to "off", it turns off.

As a result, the key K is set to the “ON”,
By the operation during the “off”, it also has a function as a key switch for interrupting power supply from the battery case 6 to the electric motor M via the power supply cord 16,
There is no need to separately provide an operating means for locking the battery case 6, and the configuration can be simplified.

FIG. 8 is a cross-sectional view showing the vicinity of a lock position according to another embodiment of the present invention. In this embodiment, concave portions 8a, 8a,... Are provided at a plurality of positions on the lower surface of the lock plate 8 which comes into contact with the rollers 63, and these concave portions 8a engage with the rollers 63 as shown in the drawing. , A click feeling at a predetermined rotation position is obtained. According to this configuration, the spring piece 81 shown in FIG.
The number of parts can be reduced.

In the above embodiment, the lock plate 8 is provided on the support bracket 7 on the vehicle body frame side, and the contact portion is provided on the battery case 6 side. Conversely, the contact portion is provided on the vehicle body frame side. The contact portion may be provided with a lock plate 8 on the side of the battery case 6 to restrict the battery case 6 with these.

[0050]

As described in detail above, in the electric bicycle according to the present invention, the lock plate attached to the body frame or the battery case is turned by the turning operation of the operating means, and is provided on the battery case or the body frame. Since the battery case comes into contact with the battery case and the battery case is unremovably restrained, no complicated mechanism is required, and the battery case can be securely restrained by a simple configuration.

Further, since the battery case is sandwiched between a pair of frame members in the vehicle width direction and is detached by being pulled upward, the battery case can be moved in the left and right directions by the frame member so that the battery case is moved in the vertical direction. Are restrained by the lock plates, and the battery case can be fixed without displacement.

Further, since the connection portion for supplying power from the battery case to the electric motor is provided near the contact position between the lock plate and the contact portion, when the locked state is obtained, the output terminal of the battery case is connected to the vehicle body. The power supply terminal provided at the corresponding position of the frame is connected without displacement, and a reliable power supply state can be obtained.

When a lock state is obtained by rotating the lock plate, the recess formed on the outer periphery of the click plate that rotates together with the lock plate engages with the spring piece, or one of the lock plates is engaged. Since the concave portion provided in the portion and the contact portion are configured to be engaged, a click feeling can be transmitted to a user operating the operating means to sense that the locked state has occurred, and a good feeling of use can be obtained. Will be obtained.

Further, since the contact portion with the lock plate is constituted by a roller which rotates around an axis intersecting the rotation axis of the lock plate, the roller contacts the one surface of the lock plate and rolls. A smooth contact state is obtained, and the battery case can be securely locked.

Further, since the rotation operation of the lock plate is performed by the key, the battery case cannot be removed without the key, so that the battery case can be securely prevented from being stolen. The present invention is excellent in that the operation means using a key also functions as a key switch for interrupting the power supply from the battery case, so that there is no need to provide an operation means dedicated to locking and the configuration can be simplified. It works.

[Brief description of the drawings]

FIG. 1 is a side view showing the entire configuration of an electric bicycle according to the present invention.

FIG. 2 is a side view showing a detached state of a battery case.

FIG. 3 is a cross-sectional view taken along line III-III of FIG.

FIG. 4 is a plan view of a main pipe showing a state where a battery case is removed.

FIG. 5 is an enlarged side sectional view showing the vicinity of a support bracket supporting a front portion of a battery case.

FIG. 6 is a view taken along the line VI-VI in FIG. 5;

FIG. 7 is a cross-sectional view taken along line VII-VII of FIG.

FIG. 8 is a cross-sectional view showing the vicinity of a lock position according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body frame 2 Front wheel 3 Rear wheel 4 Saddle 5 Pedal 6 Battery case 7 Support bracket 8 Lock plate 9 Power supply terminal 10 Vertical pipe 11 Head pipe 12 Main pipe 13 Main pipe 63 Roller 64 Output terminal 70 Key cylinder 80 Click plate 81 Spring piece B Battery K key M Electric motor

Claims (8)

[Claims] 1. An electric bicycle in which a battery case in which a battery is stored is detachably attached to a body frame by pulling a predetermined portion, and an electric motor is driven by power supply from the battery case. A part of the battery case, a lock plate pivotally supported in a plane intersecting the direction of the pulling, and a lock plate provided on the battery case or the body frame in correspondence with the lock plate; A contact portion that comes into contact with one surface of the lock plate protruding to the same side by movement to restrain the battery case from being removed, and operating means for rotating the lock plate. Electric bicycle. 2. The electric bicycle according to claim 1, wherein the battery case is sandwiched between a pair of frame members in a vehicle width direction, and is detached by being pulled upward. 3. The electric bicycle according to claim 1, wherein a connection portion for supplying power from the battery case to the electric motor is provided near a contact position between the lock plate and the contact portion. 4. A click plate which rotates together with the lock plate and has a concave portion formed on the outer periphery thereof, and a spring piece mounted on the vehicle body frame or the battery case and elastically contacting the outer periphery of the click plate. The electric bicycle according to any one of claims 1 to 3. 5. The electric bicycle according to claim 1, wherein a part of the lock plate is provided with a concave portion that engages with a part of the contact part when the lock plate is at a predetermined rotation position. . 6. The device according to claim 1, wherein the contact portion is constituted by a roller rotatably supported around an axis intersecting a pivot shaft of the lock plate. Electric bicycle. 7. The electric bicycle according to claim 1, wherein the operation means is operated by a key. 8. The operating means operated by the key,
The electric bicycle according to claim 7, which also serves as a key switch for interrupting power supply from the battery case to the electric motor.