JPS647041Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a traveling body with flexible wheels, such as a luggage carrier, which has flexible wheels attached to its lower surface so that its direction can be changed freely while traveling. In this flexible wheel, the wheel is attached to a rotating frame provided on a base so that it can freely rotate horizontally, and is displaced laterally by a predetermined distance from its vertical pivot axis.Usually, this flexible wheel has the base mounted on the front and back of the lower surface of the traveling body. When the traveling direction is changed, each wheel immediately turns around the pivot axis in the opposite direction to the traveling direction, making it easy to change the direction of the traveling body. In this case, all wheels If the vehicle is free to turn, the traveling direction of the vehicle may not be determined, which may make steering difficult.

In the freely wheeled traveling body of the present invention, while traveling,
The rotation of either the front or rear wheel's swivel frame is locked, and the other wheel's swivel frame is allowed to swivel, allowing only this wheel to steer, thereby stabilizing the direction of travel and preventing return travel. In this case, the turning lock is automatically changed back and forth so that the traveling body can travel in the opposite direction under exactly the same conditions, that is, go backwards, without turning the traveling body itself, and the turning of the above-mentioned turning frame is maintained in the locked state. By forcing
In conjunction with a reverse rotation prevention device provided on the wheels, this device can prevent the danger of the vehicle moving backwards when climbing an inclined surface (slope).

Next, the details will be explained with reference to the illustrated embodiment. A is a traveling body, A' is a flexible wheel attached to its lower surface, 1 is a mounting base thereof, 2 is a vertical fixed shaft fixed to the base 1, 3 is a rotating frame having a downward U-shaped cross section, and the rotating frame 3 is attached to the fixed shaft 2 via a steel ball 4, so that it can be horizontally rotated on the base 1 around a vertical axis X corresponding to the fixed shaft 2. ing. 5 is a vertical axis X at the lower end of the rotating frame 3.
These wheels can be mounted by being displaced a predetermined distance rearward with respect to the traveling direction of the traveling body A (FIG. 1C).
As shown in FIGS. 3 and 3, a support frame 6 having a downwardly U-shaped cross section is pivoted at a position substantially diagonally downward from the vertical axis X by a horizontal support shaft 7, and its leg plates 6a, 6
A wheel 5 is attached to the lower end of the pivot frame 3 by a support shaft (shaft bolt) 5', and both ends of the support shaft 5' protrude laterally and are connected to the lower ends of the leg plates 3a, 3a of the rotating frame 3. It is slidably fitted into arc-shaped guide grooves 8, 8 centered on the horizontal support shaft 7, and a nut 9 is attached to the other end of the shaft bolt 5'. Therefore, the support frame 6 can swing back and forth within the angle at which the support shaft 5' moves within the guide grooves 8, 8. In Figure 2 a
is the bearing of the wheel 5.

Further, the horizontal plate portion 6b at the top of the support frame 6 extends rearward by an appropriate length, and its outer edge is bent upward to form the edge 10 into a gentle mountain shape, and its central portion is cut out to form a recess. 11 is formed. On the other hand, a lock pin accommodating chamber 12 is provided at the periphery of the base plate 1, into which a lock pin 13 to be fitted into the notch recess 11 is pressed by a spring 14 so as to project downward. When the traveling body A moves in the direction of the arrow C as shown in FIG. The support frame 6 rotates backward about the support shaft 7 until the rear edge of the guide groove 8 is engaged with the rear edge of the guide groove 8, and as a result, the upper edge 10 of the support frame 6
rotates upward, and the lock pin 13 fits into the notched recess 11, thereby locking the rotation of the rotating frame 3. Reference numeral 15 denotes a tension spring provided between the upper part of the support frame 6 and the rotating frame 3, which constantly biases the wheels 5 slightly rearward.

The swivel wheel is further provided with a wheel reversal prevention device. That is, on the inside of the support frame 6, a locking frame 16 having a downwardly U-shaped cross section is rotatably supported on the horizontal support shaft 7 of the support frame 6, and the claws 16a, 16a at the lower ends of the locking frame 16 are connected to the wheels. The locking frame 1 faces the ratchet wheels 17 fixedly installed on both sides of the wheel 5.
6 rotates, and the pawl 16a engages with the ratchet wheel 17 to stop the wheel 5 from rotating in reverse. Reference numeral 18 denotes a friction plate made of a spring plate or the like fixed to the lower surface of the upper plate 16b of the locking frame 16, and its leg plates 18a, 18a are brought into light contact with both sides of the wheel 5, so that the wheel 5 is positioned behind the fixed shaft 2. During forward rotation in the direction of arrow B in FIG. This prevents the occurrence of clicking noise and reduces the
When the wheel rotates in the opposite direction, the locking frame 16 is immediately rotated downward, and the pawl 16a engages with the ratchet wheel 17, thereby stopping the wheel 5. The bearing a of the wheel 5 may be replaced with a freewheel device and used as a reverse rotation prevention device.

This free wheel also has a swivel lock that prevents the support frame 6 from rotating at the rearward rotated position shown in arrow D in FIG. Equipment is attached. That is, a pedal shaft 19 is rotatably provided in the swing frame 3 at a position forward of the support frame 6 through the leg plates 3a, 3a of the swing frame 3, and a pedal 20 is attached to the outer end of the pedal shaft 19. A locking plate 21 having a U-shaped cross section is fixed to a portion of the pedal shaft 19 inside the rotating frame 3, and the support frame 6
When the pedal shaft 19 is rotated by the pedal 20 at the rearward rotation position, the claws 21a at the lower ends of both sides of the locking plate 21 engage with the notches 22 provided at the front edge of the support frame 6, and the support frame 6 is rotated. It is designed to be fixed in the rear position. In order to hold the pedal shaft 19 at each engagement/disengagement position of the pawl 21a, a pin 23 protruding from the locking plate 21 is inserted into the groove of the elastic member b fixed to the rotating frame 3 by a pin 3'. An elastic locking member is provided that rotates and is resiliently locked in a predetermined position.

For example, this free wheel A' has a lock pin storage chamber 12 located at the front of the lower surface of the traveling body A on the front side with respect to the vertical axis X, and a lock pin storage chamber 12 located at the rear of the lower surface as shown in FIG. They are each attached via the base 1 so as to be located on the rear side with respect to the vertical axis X. When the traveling body A is moved forward in the direction of arrow C in Fig. 1A, the swivel frame 3 rotates rearward of the vertical axis X as shown in the same figure, and the support frame 6 also rotates rearward as shown by arrow D, and the rear end edge 1 of the horizontal plate portion 6b
0 rises and pushes up the lock pin 13 against the spring 14, and when the rotating frame 3 accurately rotates to the rear position, the lock pin 13 fits into the notch recess 11 and the rotating frame 3
lock. Although not shown, the front swivel frame 3 also pivots rearward on the vertical axis X, but as described above, the lock pin storage chamber 12 is on the front side, so the front swivel frame 3 is not locked. Therefore, the turning of the rear wheels is locked, and the traveling body A can be driven in a stable state while being steered only by the swingable front wheels.

When the traveling body A attempts to travel in the direction of arrow C' opposite to the direction C as shown in FIG.
8 prevents rotation, and when the rear wheel is attempted to run further, the support frame 6 rotates in the direction of arrow D' opposite to the direction D, and the notch recess 11 separates from the lock pin 13. , since the lock is released, the swing frame 3 turns in the direction opposite to the direction C' in which it is intended to travel, and becomes freely swingable. In addition, the front wheel, which can be turned freely, is also wheel 5.
Since the rotation frame 3 is prevented from reversing, the rotation frame 3 rotates in the opposite direction to the direction in which it is intended to travel, and the notch recess 11 of the support frame is locked with the lock pin 13 on the front side, so that rotation of the front wheel is locked. Since the turning lock is automatically changed back and forth, it is possible to steer the vehicle stably using only the front wheels in the traveling direction, as described above.

For example, as shown in FIG. However, if the rotating frame 3 is held in a locked state, the wheels 5 themselves are prevented from reversing, so when traveling up a slope, etc.
It is safe because the retrograde movement is prevented. When the traveling body returns, the holding by the holding device is released.

Contrary to the above example, the front swivel wheel is mounted on the lower surface of the traveling body A so that its lock pin accommodating chamber 12 is located on the rear side with respect to the vertical axis If they are installed so that they are located on the front side with respect to .
In this case, by locking the support frame 6 of the free wheel at the front in the traveling direction with the locking plate 21 to keep the wheel turning in a locked state, it is possible to prevent the traveling body from moving backwards on a slope, etc., as in the previous example. I can do it.

Since the swivel wheeled traveling body of the present invention has the above-described structure, the turning of the front or rear wheels of the traveling body is surely locked by the lock pin 13 and the notched recess 11, and the vehicle can be easily steered in a stable state. Also, when traveling back, the support frame 6
The rotation of the vehicle A and the reversal prevention device of the wheels 5 reliably and automatically change the turning lock back and forth, so that the traveling body A can immediately travel in the opposite direction in the same state without the need for turning itself. By locking the support frame 6 with the locking plate 21 via the pedal shaft 19 in the locked state as shown in FIG. This has many practical effects, such as preventing the risk of reversing even when climbing up a slope, allowing safe driving.

[Brief explanation of the drawing]

The drawings show an embodiment of the flexible wheeled traveling body of the present invention, and FIGS. 1A and 2B are longitudinal sectional side views showing the operating state, FIG. 2 is a partial longitudinal sectional rear view, and FIG. 3 is a front view of the same. . In the diagram, A'...Flexible wheel, 1...Mounting base, 2
... Fixed shaft, 3 ... Swivel frame, 4 ... Steel ball, 5 ... Wheel, 5' ... Support shaft, 6 ... Support frame,
7...Horizontal support shaft, 8...Guide groove, 9...Nut,
11... Notch recess, 12... Lock pin storage chamber,
13... Lock pin, 14, 15... Spring, 16
...Latching frame, 16a...Claw, 17...Claw wheel, 18
... Friction plate, 19 ... Pedal shaft, 20 ... Pedal, 21 ... Locking plate, 21a ... Claw, 22 ... Notch, A ... Traveling body.

Claims (1)

[Claims for Utility Model Registration] (1) A swing frame 3 is provided on the mounting base 1 so as to be horizontally swingable around a vertical axis X, and a support frame 6 is attached to the swing frame 3 through a horizontal support shaft 7 at a predetermined angle. A wheel 5 is installed at the lower end of the wheel so as to be able to swing back and forth.
The upper end edge 10 of the upper rear edge of the support frame 6 is formed into a gentle mountain shape, and a cutout recess 11 is formed in the center thereof, whereas a lock pin accommodation chamber 12 is provided in the peripheral part of the mounting base 1. A lock pin 13 that fits into the cutout recess 11 and locks the rotation of the rotation frame 3 at the rearward rotational position of the support frame 6 is provided so as to be pressed by a spring 14 and protrude downward. is provided with a reverse rotation prevention device, and the pivot frame 3 is provided with a pedal shaft 19 having a pedal 20 at its end, a locking plate 21 is attached to this, and the pedal 20 is provided with a locking plate 21.
By rotating the pedal shaft 19 through the lever, the pawl 21a at the lower end of the locking plate 21 engages with the notch 22 at the front edge of the support frame 6 to hold the support frame 6 in the backward rotation position, and the rotation frame is rotated. A free wheel A' designed to keep the rotation of 3 in a locked state is attached to the front and back of the lower surface of the traveling body A via the mounting base 1 so that the respective lock pin storage chambers 12 are oriented in opposite directions with respect to the vertical axis X. During the operation, when a retrograde force is applied to the traveling body A, the support frame 6 rotates forward,
The rotation frame 3 is unlocked by the lock pin 13, allowing the traveling body A to move backward, and by keeping the rotation of the rotation frame 3 in a locked state via the pedal shaft 19, the backward movement of the traveling body A is prevented. A traveling body with free wheels, characterized in that it is capable of preventing such damage. (2) The reverse rotation prevention device of the wheel 5 is connected to the horizontal support shaft 7.
The locking frame 16 is rotatably supported on the lower end of the hook 1.
6a facing the ratchet wheel 17 fixed to the side surface of the wheel 5, and the friction plate 1 fixed to the locking frame 16.
8 is in sliding contact with the side surface of the wheel 5, and when the wheel 5 is reversed, the locking frame 16 rotates and the pawl 16a locks the ratchet wheel 17. The described traveling body with free wheels. (3) By slidably fitting the support shaft 5' of the wheel 5 into the guide groove 8 bored in the lower part of the swing frame 3, the support frame 6 can be slid in the front and back direction within a predetermined angle. A traveling body with free wheels as set forth in claim 1 or 2 of the utility model registration claim.