JP4934212B2 - Wheelbarrow lock device - Google Patents

Description

  The present invention relates to a lock device for a hand cart that can easily perform locking and unlocking operations.

  In a cart that has a front wheel and a fixed rear wheel at the lower part of the base plate and can travel by raising a hand pushing handle at the rear, a lock device that restrains the rear wheel is disclosed in Patent Document 1, for example. Are known. This device is provided with a brake plate on the rear wheel of the carriage so as to face the outer peripheral surface, and the carriage is provided with a swingable link for pressing the brake plate against the rear wheel, and the link is swung. A pedal is provided, and when the pedal is depressed, the brake plate is brought to the lock position to brake the carriage.

Japanese Utility Model Publication No. 61-177903

In recent years, it has been frequently carried out by delivery companies to carry a load on a handcart from a transport vehicle parked nearby to a delivery destination. During home delivery, a truck may be parked on the street and leave the place with the luggage on it. In this case, the wheel is locked for safety, but this lock can be easily released in consideration of workability. The same applies to those described in the above prior art documents. This makes it easy for anyone to carry the luggage with the cart, which is a major problem in preventing theft.
Accordingly, an object of the invention according to this application is to provide a locking device for a hand cart with a simple structure that can be easily locked and unlocked in a locked state.

Hereinafter, the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.
In order to solve the above problems, the locking device of the invention according to this application includes a front wheel and a fixed rear wheel 3 at the bottom of a base plate 2, and a cart 1 in which a handle 4 is pushed up at the rear. The rear wheel 3 is constrained and locked and unlocked, and the main shaft 5 installed in the left-right direction below the base plate 2, the lock member 6 interlocked with the main shaft 5, and the main shaft 5 are rotated. A pedal 8, a holding member 9 that holds the main shaft 5 in the locked position, a locking member 10 that restrains the holding member 9 in the holding position, an electric lock device 11 that operates the locking member 10, and an electric lock device 11 And a wireless transmitter 12 to be operated.
The main shaft 5 is reciprocally rotatable between a locked position and an unlocked position, and is normally rotationally biased so as to be disposed at the unlocked position, and has an engaging portion 14 in the middle.
The lock member 6 is movable between the locked position and the unlocked position in conjunction with the rotation of the main shaft 5, restrains the rear wheel 3 at the locked position, and releases the rear wheel 3 at the unlocked position.
The pedal 8 is coupled to the main shaft 5 so that the main shaft 5 is in the upper position when the main shaft 5 is in the unlocked position and is in the lower position when the main shaft 5 is in the locked position, and rotates the main shaft 5 to the locked position by a stepping operation.
The holding member 9 is provided at the lower part of the base plate 2 and is movable between a holding position for engaging with the engaging portion 14 of the main shaft 5 and a releasing position for releasing from the engaging portion, and is always biased to the holding position. And has a stepping operation portion 22 for moving from the holding position to the release position. The holding member 9 is driven by the engaging portion 14 while the main shaft 5 is rotated from the unlocked position to the locked position, and is engaged with the engaging portion 14 by moving from the release position to the holding position. Hold in the locked position.
The locking member 10 is movable between a locking position where the holding member 9 is restrained to the holding position and an unlocking position where the locking member 10 is released.
The electric lock device 11 includes a driving device 35 that drives the locking member 10, a power source 40 for driving, a receiver 41 for an operation signal, and a control device 42 that controls the driving device 35 based on a signal received by the receiver. It has.
The transmitter 12 wirelessly transmits an operation signal of the locking member 10 to the receiver 41 of the locking device 11 from the operator of the carriage.

  According to the device of the invention relating to this application, it is possible to provide a lock device for a hand cart with a simple structure that can be easily locked and unlocked from a wireless transmitter carried by an operator in a locked state.

It is a front view of the locking device concerning the present invention. It is a top view of the locking device of FIG. It is a side view of the locking device of FIG. It is a front view of the locked state which expanded a part of FIG. It is a side view of the locked state which expanded a part of FIG. It is a top view of the locked state which expanded a part of FIG. It is a VII-VII sectional view in Drawing 6, (A) is a locked state, and (B) is an unlocked state. FIG. 4 is a side view of an unlocked state in which a part of FIG. 3 is enlarged. It is a side view in the middle of the operation | movement to the lock position which expanded a part of FIG. It is a disassembled perspective view of the principal part of the locking device concerning the present invention.

  Embodiments of the present invention will be described with reference to the drawings. 1 to 3, the carriage 1 has a front wheel (not shown) that can turn freely and a fixed rear wheel 3 at the lower part of the base plate 2, and a handwheel 4 is raised at the rear part. The vehicle travels forward (to the right in FIG. 3) manually.

  The locking device for restraining the rear wheel 3 includes a main shaft 5 installed in the lower side of the base plate 2 in the left-right direction (left and right in FIG. 1) with respect to the traveling direction, and a lock position (see FIG. 5) and a lock member 6 that can move between the unlocked position (FIG. 8), a spring 7 that urges the main shaft 5 to rotate so that the lock member 6 is normally located at the unlocked position, and a lock member 6 A foot pedal 8 coupled to the main shaft 5 so as to be in the upper position when in the unlocked position and in the lower position when in the locked position, a holding member 9 for holding the main shaft 5 in the locked position, and a holding member 9 includes a locking member 10 that restrains 9 in the holding position, an electric lock device 11 that operates the locking member 10, and a wireless transmitter 12 that operates the electric lock device. The lock member 6 restrains the rear wheel 3 in the locked position and releases the rear wheel 3 in the unlocked position.

  As shown in FIGS. 1 and 2, the main shaft 5 is supported by a pair of brackets 13 attached to the left and right under the base plate 2, has an engaging portion 14 at an intermediate portion, and has braking arms 15 at both ends. Have. The engaging portion 14 is formed by bending an intermediate portion of the main shaft 5 and extends in parallel with the rotation axis of the main shaft 5. The braking arm 15 is refracted at right angles from both end portions of the main shaft 5, and the front end portion faces the outer periphery of the rear wheel 3. The lock member 6 includes the brake arm 15 and a brake member 16 provided at the tip of the brake arm 15.

  In the illustrated embodiment, the braking member 16 is composed of a bolt screwed into the tip end portion of the braking arm 15 in the direction orthogonal to the axis, and is arranged with the head portion facing the outer periphery of the rear wheel 3. As shown in FIGS. 3 and 5, the head is restrained by pressing the head against the outer periphery of the rear wheel 3 at the locked position. The specific configuration of the braking member 16 is not limited to this.

  As shown in FIG. 2, the foot pedal 8 is made of a saddle material bent in a U-shape, and has leg portions 18 that are bent at right angles at both ends of a foot bar 17 that extends to the left and right. The ends of both legs 18 are coupled to the main shaft 5. Therefore, the foot pedal 8 turns with the rotation of the main shaft 5. The leg portion 18 is disposed so as to extend rearward from the main shaft 5 through the bracket 13, whereby the foot bar 17 is disposed at a position where the stepping bar 17 is easy to be depressed at the lower rear side of the base plate 2. The pedal 8 is coupled to the main shaft 5 so that the main shaft 5 is in the upper position when the main shaft 5 is in the unlocked position and is in the lower position when the main shaft 5 is in the locked position, and rotates the main shaft 5 to the locked position by a stepping operation.

  One end of the spring 7 is locked to the inside of the bracket 13 and the other end is locked to the foot bar 17. The main shaft 5 is rotationally biased by the spring 7, and the lock member 6 is always placed in the unlocked position (FIG. 8).

  The holding member 9 is pivotally supported by a bracket 19 fixed to the lower center of the base plate 2 with a pivot 20 parallel to the main shaft 5, and is engaged with a holding position (FIG. 5) that engages with the engaging portion 14 of the main shaft 5. It is freely movable between a release position (FIG. 9) where it is separated from the joint portion 14, and is always biased to a holding position by a spring 21. The pivot 20 is higher than the main shaft 5. The holding member 9 has a stepping operation portion 22 for moving it from the holding position to the release position. As shown in FIGS. 8 and 9, the holding member 9 is driven by the engaging portion 14 of the main shaft 5 and moves from the release position to the holding position while the main shaft 5 rotates from the unlocked position to the locked position (see FIG. 8). 8, 9) to engage the engaging portion 14 (FIG. 5) and hold the main shaft 5 in the locked position.

  That is, the holding member 9 includes a main body 23, a stepping operation part 22, a latch part 24, and a contact surface 25. The main body 23 of the holding member 9 is formed by bending a steel plate material into a U-shape, and includes a pair of parallel arm plate portions 27 extending rearward at right angles from both left and right ends of the connection plate portion 26 extending in the lateral direction. . The stepping operation portion 22 of the holding member 9 is formed by passing a bar 28 between the front end portions of the arm plate portion 27, and is located at the upper position at the holding position and at the lower position at the release position. The latch portion 24 of the holding member 9 is disposed in front of the stepping operation portion 22 with the pivot 20 interposed therebetween, and engages with the engaging portion 14 of the main shaft 5 at the holding position. That is, when the main shaft 5 rotates in the locking direction (counterclockwise in FIGS. 8 and 9), the latch portion 24 is in sliding contact with the engaging portion 14 that turns in the same direction, and is integrated with the main body 23 from the holding position to the release position. After rotating to the side (counterclockwise in FIGS. 8 and 9), the main shaft 5 is held in the locked position by engaging with the engaging portion 14 (FIG. 5). As shown in FIG. 7, the contact surface 25 is provided on the upper edge of the connection plate portion 26, and when the contact surface 25 contacts the locking surface 29 of the locking member 10, the release direction of the main body 23 (in FIGS. 8 and 9). Counterclockwise rotation) is stopped. On the upper edge of the connecting plate portion 26, a recess 30 is formed side by side with the contact surface 25 and having a bottom surface lower than the contact surface 25. Therefore, the contact surface 25 is provided on the relative protrusion 31.

  The locking member 10 is located between the abutment surface 25 of the holding member 9 and the lower surface of the bracket 19 and is movable in the left-right direction between the locking position and the unlocking position. When moving, it slides on the pivot 20. As shown in FIG. 10, the locking member 10 includes a substantially rectangular parallelepiped block-shaped main body 32 and a small rectangular parallelepiped nut portion 33 protruding rearward from the left portion of the rear side surface of the main body. The main body 32 has a groove 34 in the front-rear direction that opens to the lower surface side, and the lower surfaces on the left and right of the groove serve as the locking surface 29. When the locking member 10 is in the locking position shown in FIG. 7A, the contact surface 25 of the holding member 9 comes into contact with the locking surface 29 to prevent the holding member 9 from rising (rotating), and the spindle 5 Is held locked. On the other hand, when the locking member 10 is in the unlocking position shown in FIG. 7B and the protrusion 31 of the holding member 9 faces the groove 34 of the locking member 10, the operation unit 22 is stepped down. When the protrusion 31 is fitted into the groove 34, the holding member 9 is allowed to rise (rotate), the main shaft 5 is released from the latch portion 24, and is returned to the unlocked state.

  The locking member 10 is driven by a motor 35. The motor 35 is fixed to a mounting frame 36 fixed in the bracket 19. The nut portion 33 of the locking member 10 is received in the mounting frame 36 so as to be movable left and right. A screw rod 38 is installed on the mounting frame 36 through the screw hole 37 of the nut portion 33. The screw rod 38 is coupled to the rotating shaft of the motor 35, and the locking member 10 moves left and right by forward and reverse rotation thereof. A limit switch 39 is fixed in the mounting frame 36. When the locking member 10 reaches the locked position (FIG. 6) or the unlocked position, this is detected and a signal is sent to the control device 42 of the electric lock device 11. send.

  As shown in FIG. 1, the electric lock device 11 is driven by a motor 35 as a drive device for driving the locking member 10, a drive power supply 40, an operation signal receiver 41, and a signal received by the receiver. And a control device 42 for controlling the device. The transmitter 12 is carried by the operator of the carriage 1 and wirelessly transmits an operation signal of the locking member 10 to the receiver 41 when appropriate.

  The carriage 1 is always in the unlocked state shown in FIG. In this state, the holding member 9 is in the holding position, but the engaging portion 14 of the main shaft 5 is not restrained by the holding member 9. Further, since the locking member 10 is in the unlocked position shown in FIG. 7B and the holding member 9 is not restrained, it can be rotated to the released position (counterclockwise in FIG. 8).

  When locking the cart 1 in such an unlocked state, the main shaft 5 is rotated counterclockwise to the position shown in FIG. 5 by stepping on the pedal 8, and the braking member 16 is pressed against the rear wheel 3. Let During this time, the holding member 9 is pushed by the engaging portion 14 of the main shaft 5 and rotates counterclockwise. When the state shown in FIG. 9 is exceeded, the holding member 9 is returned to the holding position by the spring 21, and FIG. As shown, the engaging portion 14 engages with the latch portion 24 of the holding member 9, and the main shaft 5 is held in the locked position. When the detection means (not shown) detects this state and sends a signal to the control device 42, the motor 35 rotates and the locking member 10 automatically moves to the locking position shown in FIG. Is constrained to the holding position. In this state, even if the operation unit 22 is stepped down to release the lock, the holding member 9 does not rotate, so the carriage 1 is locked in the locked state. Even if the operator leaves the carriage 1 in this state, it is difficult for others to move the carriage.

  When the operator returns from the delivery work and approaches the carriage 1, when the unlocking signal is transmitted from the transmitter 12 carried to the locking device 11, the motor 35 rotates and the locking member 10 is moved to FIG. The holding member 9 is released because the abutment surface 25 and the locking surface 30 are separated from each other. In this state, when the operation unit 22 is stepped down, the holding member 9 rotates against the spring 21 and releases the engaging unit 14 as shown in FIG. The main shaft 5 is returned to the unlocked position by the spring 7, and the carriage is unlocked.

  The unlocking command signal from the transmitter 12 resets the locking device, and the state in which the engaging portion 14 is again engaged with the latch portion 24 is detected after a predetermined short period of time assumed to be depressed by the operation portion 22. Then, the motor 35 is started and locked again. Therefore, even when the unlocking operation is not performed for a predetermined time in the unlocked state, the locking is performed again.

DESCRIPTION OF SYMBOLS 1 Bogie 2 Base plate 3 Rear wheel 4 Handle for pushing 5 Spindle 6 Lock member 7 Spring 8 Foot pedal 9 Holding member 10 Locking member 11 Locking device 12 Radio transmitter 13 Bracket 14 Engaging portion 15 Braking arm 16 Braking member 17 Footing Bar 18 Leg portion 19 Bracket 20 Pivot 21 Spring 22 Operation portion 23 Holding member body 24 Latch portion 25 Contact surface 26 Connection plate portion 27 Arm plate portion 28 Bar 29 Locking surface 30 Recessed portion 31 Protruding portion 32 Locking member main body 33 Nut portion 34 Groove 35 Motor 36 Mounting frame 37 Screw hole 38 Screw rod 39 Limit switch 40 Power supply 41 Receiver 42 Control device

Claims (2)

In a cart having a front wheel and a fixed rear wheel at the bottom of the base plate, and raising a handle for pushing at the rear, a locking device for restraining the rear wheel,
A main shaft that is installed in the left-right direction below the base plate, is reciprocally rotatable between a locked position and an unlocked position, is normally rotated and urged to be disposed at the unlocked position, and has an engaging portion in the middle. When,
In conjunction with the rotation of the main shaft, the lock member is movable between a locked position and an unlocked position, restrains the rear wheel at the locked position, and releases the rear wheel at the unlocked position;
A pedal coupled to the main shaft so as to be in an upper position when the main shaft is in an unlocked position and in a lower position when in the locked position, and to rotate the main shaft to a locked position by a stepping operation;
Provided at the lower part of the base plate and freely movable between a holding position for engaging with the engaging portion of the main shaft and a releasing position for releasing from the engaging portion, and is always urged to the holding position and released from the holding position. A stepping operation unit for moving to the position, and while the main shaft is rotated from the unlocked position to the locked position, the main shaft is driven by the main shaft engaging portion to move from the release position to the holding position and engage with the engaging portion. A holding member for holding the main shaft in the locked position;
A locking member movable between a locking position for restraining the holding member at a holding position and an unlocking position for releasing the holding member;
An electric lock device including a driving device for driving the locking member, a driving power source, a receiver, a control device for controlling the driving device by a received signal of the receiver;
A locking device for a hand cart, comprising: a transmitter capable of wirelessly transmitting an operation signal of the locking member from a cart operator to a receiver of the locking device. The engaging portion of the main shaft is disposed so as to extend in parallel with the rotation axis of the main shaft,
The holding member includes a main body that is reciprocally rotatable between a holding position and a release position and is always urged to rotate to the holding position, and the stepping operation that is configured integrally with the main body and rotates the main body to the release position by a stepping operation And a latch part that is formed integrally with the main body and engages with the engaging part of the main shaft in the holding position and separates from the engaging part of the main shaft in the release position, and is engaged with the locking member formed on the main body A contact surface that restrains or releases the main body in the holding position depending on the position;
The main body of the holding member is pivotally supported by a bracket provided under the base plate by a pivot located parallel to and above the main shaft, and is configured to be reciprocally rotatable between a holding position and a release position. And
The stepping operation part of the holding member extends forward from the pivot from the main body, is configured to be higher in the holding position, and lower in the release position,
The latch portion of the holding member is engaged with the engaging portion of the main shaft while rotating the main shaft from the unlocked position to the locked position, and rotates from the holding position to the release position side integrally with the main body. It is configured to engage the joint and hold the spindle in the locked position,
The contact surface of the holding member is provided at a position behind the pivot of the upper edge of the main body,
The locking member is positioned between the contact surface of the holding member and the lower surface of the bracket, and is supported by the bracket so as to be movable between a locked position and an unlocked position. A locking surface that prevents the rotation of the holding member toward the release position and is released from the contact surface at the unlocked position and allows the holding member to rotate toward the release position.
The driving device for driving the locking member includes a motor fixed to the bracket, and a motor that is rotatably and reciprocally rotated by the motor, and is screwed into the locking member to lock the locking member into a locked position and an unlocked position. The lock device for a handcart according to claim 1, further comprising a screw rod that reciprocates between the two.

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