JPH0329268Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention mainly relates to a brake mechanism used for a bogie.

Conventional technology The conventional brake mechanism mainly used for trolleys is
A stopper rod is rotatably provided on the vehicle body or the wheel support so as to come into contact with the wheel pivoted directly on the vehicle body or via the wheel support from above. .

Problems to be Solved by the Invention This conventional brake mechanism had a weak braking force and could only exert braking force in one direction. This was sufficient for general carts, but special carts, such as large dryer carts that have recently begun to be used for drying floors, operate large dryers on top of them. The vibration of the dryer causes the stopper rod to vibrate, weakening the contact force between the stopper rod and the wheels, and causing the inconvenience of the truck starting to move due to the jetting force of the large dryer. The need for a powerful braking mechanism arose.

Means to Solve the Problems The present invention was developed in view of the above circumstances, and the wheel is lifted by a stopper rod, and the contact between the stopper rod and the floor surface exerts strong braking force in both directions. To explain the brake mechanism according to the present invention, its structure is such that it is applied from above to a wheel 2 which is pivoted to a vehicle body 1 either directly or via a wheel support 1a. In a brake mechanism in which a stopper rod 3 is rotatably provided on the vehicle body 1 or the wheel support 1a so as to be in contact with the vehicle body 1 or the wheel support 1a, the rotational center point of the stopper rod 3 is designated as A, and the center point of the shaft attachment portion of the wheel 2 is designated as A. B, the distance between AB is l, the length of the stopper rod 3 (the length from A to the point where the stopper rod 3 and the wheel 2 come into contact) is m, and the radius around A is m. The two points that intersect the circumference of wheel 2 by drawing a circular arc are C,
C' (the lower one is C'), the radius of the wheel 2 is r, the distance between C' and the floor is s, and the thickness of the part of the stopper rod 3 in contact with the floor (the lower one is C'). Stopper rod 3 from C′ when is in position C′
(hereinafter referred to as A, B, C, C', l,
m, r, s, t refer to the above)
, A is located diagonally above C', and C and C' are located within a 90 degree angle from a vertical line drawn from B to the point of contact with the floor, with B as the center.
Furthermore, the position of C' is limited to a location where a part of the outer periphery of the stopper rod 3 that comes into pressure contact with the area can come into contact with the floor surface, and where the rotation of the wheel 2 can be fixed by the pressure contact force. l+r>m, but by making at least one of the values of l, m, and r elastically variable, l+r≦m is temporarily held, and furthermore, s<t. .

Effect The operation of the present invention will be explained based on the drawings.

First, when the stopper rod 3 is lowered, m<l+r
Therefore, the stopper rod 3 stops when this end reaches point C. In this state, braking force is exerted only in one direction (to the left in FIG. 1) as in the conventional case. Next, when the end of the stopper rod 3 is strongly pushed downward, at least one of the values l, m, and r changes elastically, so that the relationship m≧l+r is temporarily established, and the stopper rod 3 It crosses the intersection D between the extension line of AB and the circumference of wheel 2 and reaches point C'. When the end of stopper rod 3 reaches point C',
Since s<t, the wheel 2 is approximately equal to the difference between s and t.
is lifted. In this state, A is located diagonally above C', so the force applied to A generates a clockwise moment in the stopper rod 3 in Figure 1, and this force and l, m, r When some of the elastic forces are balanced, the stopper rod 3 and the wheel 2 are maintained in a strongly pressed state at point C', and the wheel 2 is kept in a fixed state. Furthermore, since the end of the stopper rod 3 is in contact with the floor surface, a strong braking force is exerted in both directions.

To release the brake, push the vehicle body 1 downward using the handlebars or the like to move it forward a little, or press the wheel 2 with your foot and push it a little.The wheel 2 will come into contact with the floor and the wheel will move forward. 2 rotates a little, and the end of the stopper rod 3 rotates accordingly.
From point C', cross point D and arrive at point C. If the stopper lever 3 is lifted with the tip of the foot or hand and hooked onto the vehicle body 1, or placed against the vehicle body 1, the brake is completely released.

Embodiment The present invention will be further explained in detail based on an embodiment shown in the drawings.

1 in the figure is the vehicle body.

Reference numeral 2 denotes a wheel, which is pivoted to the vehicle body 1 either directly or via a wheel support 1a. In this embodiment, the wheel 2 is pivotally attached to the vehicle body 1 via the wheel support 1a,
Moreover, this wheel support body 1a can be moved diagonally up and down, and in this way,
As wheel 2 wears down, r becomes smaller, and l+r>m
If the relationship no longer holds true (the braking force disappears), the relationship l+r>m can be obtained again by moving the wheel support 1a and increasing l.

Reference numeral 3 denotes a stopper rod, which is rotatably provided on the vehicle body 1 or the wheel support 1a so as to contact the wheel 2 from above in a manner that covers it. and C and C' are located within a 90 degree angle from a vertical line drawn from B to the point of contact with the floor surface with B as the center, and the position of C' is pressed against the said part. A part of the outer periphery of the stopper rod 3 can come into contact with the floor surface, and rotation of the wheel 2 can be fixed by the pressure contact force. To obtain this relationship, it is best to make the value of m slightly smaller than the value of l+r so that the line connecting AB is at about 60 degrees with respect to the horizontal line. In this case, if the position of C' is too close to the contact point of the wheel 2 with the floor surface (if the value of s approaches zero), the pressure contact between the stopper rod 3 and the wheel 2 will easily come off. , C' should be located as far away from the contact point of the wheel 2 with the floor surface as possible, so that the engagement state does not easily come off, that is, the rotation of the wheel 2 can be fixed by the pressure contact force of the stopper lever 3. It is limited to the places where it is held. It is convenient to wrap rubber or the like around the horizontal portion of the stopper rod 3, as this will provide a stronger braking force.

On the other hand, by making at least one of the values of l, m, and r elastically variable, normally l+r>
m is temporarily set so that l+r≦m holds true. To give a concrete means for this, first
In order to elastically change the value of , the wheel 2 should be made to move like a suspension, or an elastic body such as rubber, leaf spring, coil spring, etc. should be placed between the wheel support 1a and the vehicle body 1. By intervening, the value of l becomes temporarily smaller when the stopper rod 3 crosses point D, and the above relationship can be satisfied.

In order to make the value of m elastically variable, a part or all of both side portions of the stopper rod 3 should be made of coil springs, or the horizontal portion of the stopper rod 3 should be made elastic so that it can bend. Then, the value of m temporarily increases when the stopper rod 3 crosses point D, so that the above relationship can be satisfied.

In order to make the value of r elastically variable, if an elastic material such as rubber is used as the material of the wheel 2, the wheel that the stopper rod 3 is in contact with when the stopper rod 3 crosses point D can be used. Since the portion 2 is recessed and r here becomes temporarily small, the above relationship can be satisfied.

As mentioned above, various means for elastically varying the values of l, m, and r can be considered and are not particularly limited, but in this embodiment, as shown in FIG. The value is made to vary elastically.

Effects of the invention The present invention having the above configuration has the following effects.

The brake mechanism according to the present invention has a stopper rod 3.
When is in position C, braking force is exerted in only one direction, as in the past. In this state, braking force is applied when the cart moves backwards, which is useful when pushing the cart up an uphill slope.

On the other hand, when the stopper lever 3 is in position C', the wheel 2 is fixed and the stopper lever 3 is on the floor.
Because they touch each other, it exerts strong braking force in both directions. Furthermore, even if a machine such as a large dryer for floor drying is operated on a trolley, the vibration of the machine causes the stopper rod to vibrate, which weakens the braking force. There were no more inconveniences.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Fig. 1 is a configuration diagram showing the operation of the invention, Fig. 2 is a state diagram showing a stopper lever that comes into contact with a wheel, and Fig. 3 is a perspective view of the invention. It is. DESCRIPTION OF SYMBOLS 1...Vehicle body, 1a...Wheel support, 2...Wheel, 3...Stopper rod.

Claims (1)

[Scope of utility model registration request] A stopper rod 3 is rotatably provided on the vehicle body 1 or the wheel support 1a so as to abut the wheel 2, which is pivoted on the vehicle body 1 directly or via the wheel support 1a, so as to cover it from above. In the brake mechanism consisting of
The center point of the axle of the wheel 2 is B, the distance between AB is l, the length of the stopper rod 3 is m,
Draw an arc with radius m centered on A, and let the two points that intersect with the circumference of wheel 2 be C and C', the radius of wheel 2 be r, the gap between C' and the floor surface be s, and the stopper rod 3
If the thickness of the part in contact with the floor is t, then A
C' is positioned diagonally above C', and C and C' are positioned within an angle of 90 degrees from a vertical line drawn from B to the point of contact with the floor surface, with B as the center, and C' The position of is limited to a location where a part of the outer periphery of the stopper rod 3 that presses against the area can come into contact with the floor surface, and where the rotation of the wheel 2 can be fixed by the pressure contact force, and normally l+r>m, but , l, m, and r so that l+r≦m is temporarily satisfied by elastically varying at least one of the values of l, m, and r, and further, s<t.