JPH0556502U - Caster - Google Patents

Abstract

(57) [Abstract] [Purpose] By mounting it on a wheelbarrow or a handcart, etc., you can easily get over a step, and
It is possible to get over higher steps. [Structure] An auxiliary wheel 6 that turns around a wheel 5 that can move back and forth is attached to a frame 2 that swings vertically. The displacement between the main wheel 5 and the mounting frame 1 caused by being pressed against the step is converted into vertical movement of the auxiliary wheel, and the main wheel is pushed up to easily get over the step. In particular, when the caster is used for a hand truck, etc., the caster is capable of increasing the limit height that can be overcome without increasing the size of the wheel.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 This invention relates to a bicycle wheel used for a wheelbarrow or a travel cart.

[0002]

[Prior Art]

 Many casters are used as carts for transporting carriages, baby carts, shopping carts, and the like. It is desirable that the casters attached to such a dolly have wheels that are as small as possible in order to mount the load on the dolly and to easily store the dolly itself. However, larger wheels are advantageous for overcoming the step, and the size of the wheels is compelling to compromise between the two contradictory conditions.

[0003]

[Problems to be solved by the device]

 The present invention aims to provide a compact caster with a high ability to climb over a step for realizing a trolley or the like that can easily carry over a higher step without taking a lot of space to store and store luggage. To aim.

[0004]

[Means for Solving the Problems]

 In the caster of the present invention, a main wheel is supported by an amplitude frame, and the amplitude frame is instructed by a mounting frame to swing back and forth around the wheel. Further, an auxiliary wheel is attached to the end of the amplitude frame, and the auxiliary wheel is attached to a position where the auxiliary wheel turns around the main wheel with the amplitude motion of the amplitude frame.

[0005]

[Action]

 This caster has the smallest caster height when stopped or running on a flat surface, and becomes taller when the main wheels hit the step and are stopped. Further, the step difference causes the auxiliary wheels to turn around the main wheels to push down the traveling surface and lift the main wheels. In other words, this amplitude frame acts to convert the reaction force, which is generated by the force pushing the trolley, etc., that obstructs the course of the main wheels, into the force for lifting the main wheels. When the main wheel crosses a step, the stress that holds down the main wheel disappears.Therefore, the load applied to the casters returns to a stable state with the shortest height, that is, the auxiliary wheel returns to the raised state and prepares for the next step. Is set.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. In FIG. 2, reference numeral 1 is a mounting frame, and an amplitude frame 2 in which a main wheel 5 and an auxiliary wheel 6 are mounted on respective axles is an amplitude frame 7 and a swinging direction of a caster It is supported so that it can oscillate. At the position where the amplitude frame is swung to the rearmost, the installation points of the main wheels and the auxiliary wheels are horizontal, and the amplitude guide 8 stops so as not to swing further backward. Even when the amplitude frame is swung to the rearmost position, the position of the main axle 3 is located before the amplitude shaft 7, and the vertical load applied to the amplitude shaft 7 causes the main axle to be swung out forward. Return to the state of.

A situation where the step difference of the caster described in FIG. 2 is exceeded will be described with reference to FIG. In Fig. 3 (a), the main wheel has reached the step, is supported by the contact point (a), and the reaction force from the traveling direction is not yet generated in the main wheel (state A). In the conventional casters, if there is a contact point (b) above the extension of the pusher and the main axle, the bogie itself will rotate forward without climbing over the step. In this caster, the pushing force of the dolly passes on the amplitude axis 7 located above the axle, and the step over the limit is higher than in the conventional caster.

By further pushing the dolly, the state shown in FIG. 3B is obtained. The amplitude shaft 7 rotates in the traveling direction with the main axle 3 at the center, and the amplitude frame and the auxiliary wheels attached to the amplitude frame also rotate, and the auxiliary wheel contacts the step at the upper contact (C). (State B). In this state, the amplitude axis becomes higher than that in the state A, and the stress line passing through the amplitude axis 7 passes through the contact points (b) and (c). In this state, even if the dolly is pushed further, the dolly itself does not rotate forward.

FIG. 3C is a diagram showing a situation in which a step is being crossed (state C). The state is a transition from state B to state C, and the main wheels and auxiliary wheels rotate and move forward with the contact points (b) and (c) always in contact. The force of pushing the dolly rotates the caster wheels in the traveling direction, and at the same time pushes up the main wheel, which is weighted by the lever principle, with the amplitude axis 7 as the force point / contact point (c) as the fulcrum / contact point (b) as the action point. ..

By further pushing the dolly, it becomes a state where the step is overcome as shown in FIG. 3D (state D). Actually, before the vehicle completely climbs over the step, the force that the main wheel is held down by the contact point (b) exceeds the force that pushes up the main wheel forward by pushing up the amplitude frame due to the load applied to the amplitude axis. Will return.

The embodiment shown in FIG. 4 is an application example to a turning / twin-wheel caster, and the amplitude axis 7 is set to a higher position to improve the step climbing performance. Further, a major difference from FIG. 3 is that the car bearing frame 9 is divided into the amplitude frame 2 and the car bearing frame 9 is divided. This is because the amplitude axis can be set at a higher position and the height of the auxiliary wheel in the A state can be secured so that a higher step can be overcome.

FIG. 4A is a partial cross-sectional view showing a state A when traveling on a plane. FIG. 4B is a partial cross-sectional view of the front with the viewpoint, and FIG. 4C shows the state D. The situation in which the amplitude frame pushes down the auxiliary wheels by the sliding amplitude guide 8 and the main axle 3 is similar to the amplitude frame in FIG. Further, the spring 11 plays an auxiliary role of returning from the state D to the state A, and at the same time, supports the swing frame when the carriage is lifted.

FIG. 5 shows an embodiment in which a car bearing slide hole 12 is provided in the mounting frame so that the main axle can move forward and backward instead of the car bearing frame, and the caster height becomes high when pushed down rearward. Is.

FIG. 6 is an application example in which the amplitude guide 8 is provided separately from the main axle 3, and except that the amplitude guide is not fixed and slides up and down as the amplitude frame rotates. It is similar to the embodiment shown in FIG.

FIG. 7 shows that the auxiliary wheel is mounted behind the main wheel with respect to the traveling direction, and the force that holds the main wheel is converted into a motion in which the auxiliary wheel turns around the main wheel, Works to push the upper part of the step. In this respect, the mounting position of the auxiliary wheel is different from the previous examples, but it is mechanically similar. Correspondences between the states shown in FIG. 3 are as follows: FIG. 7 (a) shows the A state, FIG. 7 (b) shows the B state, FIG. 7 (c) shows the C state, and FIG. 7 (d) shows the D state. ing.

FIG. 8 shows an application example to a stroller. The mechanism is similar to that of the embodiment described with reference to FIG. 4, but the spring 11 is a compression coil spring and not only plays an auxiliary role of returning to the state A of FIG. 4 but also absorbs impact during traveling. It also helps to eliminate the level difference between the front wheels and the left and right wheels when the wheels pass over a step. This is possible by mounting the mounting frame 1 so that the leg frame 14 can slide up and down.

FIG. 8A is an overall view of the baby cart. The figure (b) shows the state A when traveling on a plane, and the figure (c) shows the state C where the vehicle is over a step.

FIG. 9 shows an application example to a travel cart or the like. Unlike the casters and baby carts shown in Fig. 8 that are used by pushing the dolly as shown above, this figure is an application example when pulling. However, even if the direction of the force to move the trolley is different, if the wheels hit a step, the situation is the same as described above, and if the lane is overcome, the trolley itself will not be rotated. However, the effect is rather large.

FIG. 9 shows an application example using the car bearing frame 9, which has the same mechanism as that shown in the caster example of FIG. 4, and uses the amplitude guide 8 as shown in FIGS. 5 and 6. It is also possible to apply the method of pushing up the main wheel with auxiliary wheels as shown in FIG.

FIG. 9A shows a state A and a state B in which the auxiliary wheel is in contact with the upper step of the step when traveling on a flat surface, FIG. 9B shows a state C where the step is over the step, and FIG. 9C shows a step. The state D 1 in which the vehicle has been overcome is shown. Further, FIG. 9 (d) shows the state where the luggage carrier of the travel cart is folded.

FIG. 10 is an application example to a travel cart and the like as in FIG. 9, but the main axle 3 is supported by the mounting frame 1, and the amplitude is supported by the lower end of the pull tab 12 that moves up and down in the bed pipe 13. The difference is that in FIG. 9, the swing shaft 7 is supported by the mounting frame 1 and the main axle 3 swings, while the swing frame rotates by the movement of the shaft 7.

FIG. 10A is a state A, FIG. 10B is a state D, and FIG. 10C is an enlarged front view of the leg part.

FIG. 11 shows an application example in the case of being used as a leg wheel such as a travel bag. When the main wheel 5 is attached to the main axle 3 at the lower end of the car bearing frame 9 supported by the guide pin 15 and hits against the step to be stopped, the car bearing frame 9 slides downward. On the other hand, the auxiliary wheel 6 mounted on the tip of the car bearing frame supported by the amplitude shaft 7 rotates around the main wheel as the car bearing frame 9 slides and the main wheel 5 is stopped, The function of lifting is the same as in the previous examples.

[0024]

[Effect of the device]

 As described above, when the wheels of the present invention try to get over the step, the auxiliary wheels help the main wheels to climb the main wheel to the upper step of the step, so that the caster can easily get over the step. Along with this, it works so that you can overcome higher steps. In other words, even smaller wheels can get over bumps.

[0025]

[Brief description of drawings]

FIG. 1 is a perspective sectional view of a caster.

FIG. 2 is a comparison view of a caster in a plane running state and an operation state in which a caster rides over a step.

FIG. 3 is a diagram showing the operating state of casters in stages.

FIG. 4 is an illustration of an example caster with a car bearing frame.

FIG. 5 is a diagram of an example caster with an amplitude guide.

FIG. 6 is an illustration of an example caster with an amplitude guide.

FIG. 7 is a diagram of an example of a caster provided with an auxiliary wheel at a rear portion.

FIG. 8 is a diagram showing an application example to a hand truck or the like.

FIG. 9 is a diagram showing an application example to a guide two-wheeled vehicle or the like.

FIG. 10 is a diagram showing an example of application to a two-wheel guided vehicle or the like.

FIG. 11 is a diagram showing an application example to a guide two-wheeled vehicle or the like.

[Explanation of symbols]

 1 Mounting Frame 2 Amplitude Frame 5 Main Wheel 6 Auxiliary Wheel 7 Amplitude Shaft 9 Car Bearing Frame d Maximum Displacement

Claims (1)

[Scope of utility model registration request] 1. A mounting frame 1 mounted on a moving body.
A caster comprising an amplitude frame 2 supported by the mounting frame so as to be capable of swinging up and down, and a main wheel 5 and an auxiliary wheel 6 mounted on the amplitude frame.