JPH1122755A - Brake mechanism for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably improve a brake and stop function and to simultaneously additionally provide a lock function. SOLUTION: An actuating lever 10 provided at a tip with a brake working lever 12 is pivotally supported at the frame 50 of a truck by a support axle 11. A brake auxiliary plate 20 having one end pivotally mounted on a frame 50 is located between the brake working lever 12 and the outer peripheral surface 60 of a wheel. By rotating the actuating lever 10 in the direction of an arrow mark P, the brake working plate 20 is pressed by the brake working 12, and this constitution performs brake and a stop of a wheel by pressing the outer peripheral surface 60 of the wheel by the brake auxiliary plate 20. When the actuating lever 10 makes contact with a contact pin 15, the actuating lever 10 is brought into a lock state. The axle 21 of the brake auxiliary plate 20 is positioned in a position deviated from a tangential line making contact with an intersection between a straight line to interconnect the support shaft 11 of the actuating lever 10 and a locus on which the brake working lever 12 is rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a braking mechanism of various manually propelled vehicles such as a transport vehicle, a transport trolley, various hand trucks, a stroller, a wheelchair, and the like for transporting or transporting luggage and the like. It can also be used as a braking mechanism for an auto-propelled vehicle having the device.

[0002]

2. Description of the Related Art FIG. 5 is a schematic explanatory view of a braking mechanism portion of a conventional carriage, and shows a substantially L-shaped operating rod 40.
Is mounted on a bogie frame 50 by a support shaft 51, and a braking operation rod 41 is provided at the tip of the operating rod 40 so as to extend toward the surface of the drawing. The operation of this braking mechanism is as follows. First, the braking of the operating rod 40 indicated by the virtual line (two-dot chain line) is released at the position where it is in contact with the contact pin 53. From this position, P
The brake can be applied by rotating the operating rod 40 in the direction of, and bringing the braking action rod 41 into sliding contact with the outer peripheral surface of the wheel 55. In this state, the contact is made with the contact pin 54 with the brake applied.
, The state in which the brake is applied in the clockwise direction with the spring or the like can be maintained. In addition, even at the position of the operating rod 40 (virtual line) in a state where the brake is released, the operating rod 40 is normally urged in the counterclockwise direction by a spring or the like.

FIG. 6 is a schematic explanatory view showing the operation of the above-mentioned conventional braking mechanism, which will be presented later for comparison with the case of the braking mechanism of the present invention. In the figure,
Lines AOB and COD indicate operating rods, and points B and D indicate braking rods. Also, the outer peripheral surface of the wheel is S,
The center of the axle of the wheel is indicated by W. Operating rod AOB
Is in the position where the brake is not applied. At the position of the operating rod COD, the brake is applied most. In this explanatory diagram, the outer peripheral surface S of the wheel and the trajectory R of the braking action rod (the trajectory R indicates the trajectory of the outermost circumference of the braking action rod) are drawn so as to intersect by the distance x. This is to facilitate understanding and to compare later with the braking mechanism of the present invention.

[0004]

In the above-mentioned conventional braking mechanism, the braking rod 41 itself is rod-shaped,
The braking action rod 41 comes into sliding contact with the outer peripheral surface of the wheel 55 as a line, leaving room for further improvement in terms of the braking function. Furthermore, in this braking mechanism, when a force is applied so that the wheels rotate clockwise,
In some cases, the operating rod 40 rotates counterclockwise to release the brake, and as another means, it is necessary to provide a lock mechanism that does not release the braking and stopping of the operating rod 40. In view of the above, an object of the present invention is to provide a braking mechanism having improved braking and stopping functions as compared with the conventional braking mechanism described above, and further, it is not necessary to provide a lock mechanism as another means, and to provide a braking mechanism. It is an object of the present invention to provide a device having a lock function in a stopped state.

[0005]

According to a first aspect of the present invention, a brake rod 12 is pressed against the outer peripheral surface of at least one wheel of a vehicle to brake the wheel.
In the braking mechanism for stopping, a braking auxiliary plate 20 having one end pivotally mounted on the vehicle body side is interposed between the braking operation rod 12 and the outer peripheral surface of the wheel.
, Whereby the brake assist plate 20 presses the outer peripheral surface of the wheel to brake and stop the wheel. Due to the presence of the braking auxiliary plate 20, the outer peripheral surface of the wheel is braked by the surface of the braking auxiliary plate 20, so that the braking effect is further improved. In addition, the rotation of the brake operation rod 12 causes the brake assist plate 2 to rotate.
0 is pressed toward the center of the wheel, and the braking function is remarkably improved as compared with the conventional braking mechanism.

According to a second aspect of the present invention, in the first aspect, the operating rod 10 for operating the brake operating rod 12 is axially attached to the vehicle body by the support shaft 11, and the distal end of the operating rod 10 is braked. When one of the angles formed between the extension line connecting the brake operation rod 12 and the support shaft 11 of the operation rod 10 and the auxiliary brake plate 20 is 90 degrees or more, the operation rod 10 or the brake operation rod is provided. The operating rod 10 is locked by the contact of the contact member 12 with a contact member such as the contact pin 15. Here, the locked state means that a state in which the braking and stopping of the operating rod 10 is not released is maintained. However, in the present invention, the operating rod 10 is always placed in a state where a load is applied in the braking direction, In addition, the locked state is maintained because the outer peripheral surface of the wheel does not directly contact the braking action rod. Due to the positional relationship between the operating rod 10 and the contact member as described above and the presence of the brake assist plate, the operating rod 10
Alternatively, the braking operation rod 12 can maintain a locked state in which the braking is not released in the braking or stopping state in contact with the contact member.

According to a third aspect of the present invention, in the first or second aspect, the straight line connecting the support shaft 11 of the operating rod 10 and the axle of the wheel to be braked and the braking action rod 12 rotate. The support shaft 21 of the brake assist plate 20 is located at a position shifted from a tangent line that is in contact with the intersection with the locus. As described above, by positioning the support shaft 21 of the braking auxiliary plate 20, the braking effect of the braking mechanism of the present invention is further improved.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show an embodiment of the present invention. FIG. 1 is an explanatory diagram illustrating a portion of a braking mechanism according to the present invention provided on a transport vehicle. The transport trolley includes a luggage placing portion 57, a handle portion 58 that rises vertically from the rear side of the luggage placing portion 57,
This is a conventional type including a front wheel and a rear wheel 55 provided on both sides of the luggage placing portion 57. Lateral frame 5 of the bogie near the rear wheel 55 (right side in the figure)
The operating rod 10 is pivotally mounted on the support rod 11 at zero.

The operating rod 10 has a substantially L-shape in a side view.
At one end, a braking rod 12 extends perpendicularly from the operating rod 10 toward the surface of the drawing. A turning ring 13 is provided on the outer periphery of the braking action rod 12. A grip 14 for gripping and operating the operating rod 10 is provided at the other end of the operating rod 10. Further, in the present invention, a braking auxiliary plate 20 made of a substantially rectangular metal plate is interposed between the braking operation rod 12 and the outer peripheral surface 60 of the wheel 55. At its upper end, it is mounted on a bogie frame 50 by a support shaft 21. This brake assist plate 20 is a feature of the present invention. Also, the frame 50
A contact pin 15 is implanted in the vicinity of an upper portion of a braking operation rod 12 formed at a distal end portion of the operation rod 10 in a braking and stopping state.

The operation of the braking mechanism having the above-described structure according to the present invention is as follows. First, as shown by an imaginary line (two-dot chain line) in the drawing, the operating rod 10 is in a state of being released from braking in a state of being in contact with the support shaft 21. When applying the brake, hold the grip 14 of the operating rod 10 by hand,
Rotate in the clockwise direction P in the figure. When the operating rod 10 is rotated in the direction P, the braking operation rod 12 is also rotated in the same direction, and comes into contact with the braking auxiliary plate 20, so that the braking auxiliary plate 2
0 is rotated clockwise about the support shaft 21 to press the brake assist plate 20. When the brake assist plate 20 rotates clockwise, the surface of the brake assist plate 20 comes into contact with the outer peripheral surface 60 of the wheel 55 to start braking, and further presses the wheel to stop the rotation of the wheel. Can be

When the operating rod 10 is further rotated, the contact pin 1
The movement of the operating rod 10 is stopped in a state where the operating rod 10 is in contact with the moving rod 5. In this state, the angle between the line connecting the center of the support shaft 11 and the center of the braking action rod 12 and the brake assist plate 20 is set so that the angle on the support shaft 21 side is 90 degrees or more. . With this setting, the braking operation rod 12 of the operating rod 10 receives a force in the clockwise rotation direction due to the reaction of the braking auxiliary plate 20, and the operating rod 10 receives a force in a direction in which the brake does not come off. It is. This will be described in more detail later.
As described above, the braking mechanism according to the present invention allows the wheels 55
Is braked and stopped, and the brake and stop are locked, so that there is no need to provide a lock mechanism such as a brake release prevention stopper. Moreover, in addition to braking the outer peripheral surface 60 of the wheel 55 by the surface of the braking auxiliary plate 20, the braking effect becomes extremely large as compared with the conventional one due to the position of the support shaft 21 of the braking auxiliary plate 20. It is. This will be described later in detail.

FIG. 2 is a schematic explanatory view showing the operating state of the above embodiment. put it here,
The line EOF and the line GOH indicate the operating rod, and the point O indicates the support shaft of the operating rod. Lines BI and BJ indicate the brake assist plate, line R indicates the trajectory of the brake operation rod provided at the tip of the operation rod, line S indicates the outer peripheral surface of the wheel, and point W indicates the center of the axle of the wheel. Is shown. The support axis of the brake assist plate is indicated by a point B. In this embodiment, the point B is indicated by a tangent line T orthogonal to a straight line connecting the support axis O of the operating rod and the center W of the wheel. It is located at a position shifted to the middle right. As a result, the braking effect is further improved.

The operating rod is rotated in the clockwise direction indicated by an arrow P in the drawing, and braking is started at a position indicated by a line EOF in the drawing. The brake assisting plate at the position of the line EOF brings the brake assist plate to the position of the line BI. At the position of the line BI, the brake assist plate comes into contact with the outer peripheral surface S of the wheel. When the braking lever moves in the clockwise direction on the line R to apply further braking, and the braking lever reaches the position of the point K, that is, when the brake assist plate comes to the position of the line BJ. The brake assist plate comes into contact with the line R of the trajectory of the braking action rod, and in this state, the brake is applied most. Furthermore,
When the operating rod is rotated clockwise, and when the operating rod comes to the position of the line GOH, the brake assist plate comes to the position of the line BI, and when the operating rod is further rotated clockwise further than that, the braking operation is performed. Disappears.

Therefore, a contact pin 15 is provided in a triangular area surrounded by the line OKH. The abutment pin 15 prevents the clockwise rotation of the operating rod, and the brake operating rod is located at any position between the arcs KH and stopped. When the braking rod is between the arcs KH,
The operating rod is loaded with clockwise turning power due to the reaction of the brake assist plate. The clockwise turning force and the contact pin 15 lock the operating rod so that the braking and stopping actions are not released. Here, it is desirable to provide a spring or the like on the braking auxiliary plate so that a biasing force always acts in a counterclockwise direction about the support shaft B. As a result, there is no fear that the brake assist plate will rattle around the support shaft.

In this figure, the outer peripheral surface S of the wheel and the locus R of the braking rod are drawn so as to be in contact with each other.
Here, if the existence of the brake assisting plate is eliminated, in this figure, the braking becomes impossible. That is, when the braking rod reaches the position of the point L, it comes closest to the outer peripheral surface of the wheel, but in this case, the braking function is hardly exhibited. On the other hand, in the present invention, by interposing a braking auxiliary plate (actually, by interposing this braking auxiliary plate, the locus R
Does not come into contact with the outer peripheral surface S of the wheel), but the braking function is sufficiently exerted even in this state. In other words, in the braking mechanism of the present invention, the braking action is represented by a line OFLK, which is a hatched area in FIG.
You are working in the area surrounded by H. That is, when the braking lever is on the locus R from the point F to the point H, the brake is applied. Therefore, it is clear that the brake mechanism provided with the brake assisting plate, like the brake mechanism of the present invention, is far superior in the braking effect.

FIG. 3 is a schematic explanatory view showing an operation state of a braking mechanism according to another embodiment of the present invention. In this braking mechanism, the position of the support shaft of the braking auxiliary plate is located at a position shifted to the left of the tangent line T in the drawing, and the rotation direction for applying the brake by the operating rod is different from that of the above embodiment. The difference is that the direction is counterclockwise. The other points are completely the same as the above embodiment.

Here, too, the line EOF and the line GOH
Indicates an operating rod, and point O indicates a support shaft of the operating rod. Lines BI and BJ indicate the brake assist plate, and line R indicates the locus of the center of the brake operation rod provided at the tip of the operation rod,
The line S indicates the outer peripheral surface of the wheel, and the point W indicates the center of the axle of the wheel. The support axis of the brake assist plate is indicated by a point B. In this embodiment, the point B is indicated by a tangent line T orthogonal to a straight line connecting the support axis O of the operating rod and the center W of the wheel. It is located at the position shifted in the middle left direction. As a result, the braking effect is further improved.

The operating rod is turned in the counterclockwise direction indicated by the arrow P in the figure, and braking is started at the position of the line EOF in the figure, contrary to the above embodiment. The brake assisting plate at the position of the line EOF brings the brake assist plate to the position of the line BI. At the position of the line BI, the brake assist plate comes into contact with the outer peripheral surface S of the wheel. In order to apply further braking, the brake operating rod moves on the trajectory R in the counterclockwise direction, and when the brake operating rod comes to the position of the point K, that is, the brake auxiliary plate comes to the position of the line BJ. At this time, the brake assist plate comes into contact with the trajectory R of the braking action rod, and in this state, the brake is applied most. Further, the operating rod is rotated counterclockwise, and when the operating rod comes to the position of the line GOH, the brake assist plate returns to the position of the line BI, and further rotates the operating rod to the left. Then, the braking effect is lost.

Therefore, the contact pin 15 is provided in the triangular area surrounded by the line OKH, as in the above embodiment.
This contact pin 15 prevents the operation rod from rotating counterclockwise, and the brake operation rod is located at any position between the arcs KH and stopped. When the braking operation rod is between the arcs KH, the operation rod is loaded with counterclockwise rotating power due to the reaction of the braking auxiliary plate.
The operating rod is locked by the counterclockwise rotating power and the contact pin 15, so that the braking and stopping actions are not released. Here, the brake assist plate is provided with a spring that always applies a counterclockwise biasing force on its support shaft, so that the brake assist plate is mounted on the outer peripheral surface of the wheel in a state where the brake is not applied. Contact can be prevented. Also in this embodiment, as in the previous embodiment, the braking effect is exerted in the hatched portions in FIG.
The braking effect is much higher than the conventional one.

Incidentally, in the braking mechanism of the present invention, the locking state is established when the operating rod or the braking operation rod is in contact with the contact pin.
In addition to the above-mentioned reason, even if the wheel rotates clockwise due to the intervention of the braking auxiliary plate, the rotation action does not directly reach the brake operation rod 12. In the conventional braking mechanism, since the outer peripheral surface of the wheel is in direct contact with the braking action rod, the rotation of the wheel directly exerts a rotational action force on the braking action rod, so that the brake comes off. .

FIG. 4 is a schematic explanatory view showing an operation state of a further embodiment of the braking mechanism according to the present invention. For comparison with the conventional braking mechanism shown in FIG. It was attached. Line EOF and line GOH indicate the operating rod, and point O
Indicates the support shaft of the operating rod, S indicates the outer peripheral surface of the wheel, point W indicates the center of the axle of the wheel, and line BJ indicates the brake assist plate. In this figure, the brake assist plate BJ is located on a tangent to the trajectory R at an intersection H between a line connecting the support shaft O and the center W of the wheel and the trajectory R of the braking action rod. And
Since the brake assist plate BJ is actually thick, the brake assist plate BJ shows the left side surface of the brake assist plate.
Is also located on the right side of the illustrated position. Here, the intersection between the line OW and the outer peripheral surface S of the wheel is M, and the point M
And the distance between point H and point x is plotted. Therefore,
By setting the distance x at which the locus R intersects the outer peripheral surface S in FIG. 6 and the distance x between the points M and H in FIG. 4 to be the same distance, the braking mechanism of the present invention and the conventional braking mechanism have the same conditions. Can be compared. As is apparent from this comparison, the braking mechanism of the present invention shown in FIG. 4 can make a clearly larger surface contact due to the presence of the braking auxiliary plate BJ, and its braking effect is smaller than that of the conventional one. Is also dramatically improved.

Although the embodiments have been described above, the embodiments of the present invention can be modified as follows. First, in the above embodiment, the mounting position of the support shaft of the braking auxiliary plate is provided at a position shifted to the right or left of the tangent line T (FIGS. 2 and 3). The effect can be exerted. This is because, in the explanatory diagrams of FIGS. 2 and 3, the sizes of the brake assisting plate and the brake operating rod are omitted, and are represented by lines and points. This is because the braking operation rod has a thickness and a size, so that the same braking effect is exerted even when the support shaft of the braking auxiliary plate is located on the tangent line T. However, in order to increase the effect, it is better to dispose the support shaft at a position shifted from the tangent line T. Although the support shaft of the brake assist plate is provided at the upper side in FIG. 1, it may be provided at the lower position. That is, the support shaft 21 can be attached below the frame 50, and the brake assist plate can be disposed facing upward.
The size, thickness, shape, etc. of the brake assisting plate can be freely designed and may be a plate-like one that can press the outer peripheral surface of the wheel. What is necessary is just to be rotatably supported by the shaft. A means for improving frictional resistance such as a ridge or a groove for improving frictional resistance may be provided on a braking surface (a surface in contact with the outer peripheral surface of the wheel) of the braking auxiliary plate.

The size and shape of the operating rod can be freely designed in various ways, and can be implemented without being substantially L-shaped as in the above-described embodiment, and the bending angle of the substantially L-shaped is 90 degrees or more. Can be set freely. In short, any form may be used as long as it can grip and rotate the grip at one end and rotate the brake operation rod at the other end about the support shaft. The turning ring provided on the braking operation rod provided at the lower end of the operating rod does not have to be particularly provided, and may be a simple rod. In the above embodiment, the contact pin 15 for stopping the rotation of the operating rod or the brake operating rod is provided on the frame of the bogie, but the contact pin 15 is provided on the back surface of the auxiliary braking plate (the surface opposite to the braking surface). ) May be provided. In this case, the braking operation rod 12 may be configured to contact the contact pin 15.

The braking mechanism according to the present invention may be provided on two or more wheels of a vehicle such as a bogie. The braking mechanism according to the present invention is provided on the rear wheels on both sides of the vehicle such as a bogie, and the support shaft of the operating rod is hung over the operating rods on both sides to operate the operating rod on one side. Of course, it is also possible to configure so as to be interlocked. The braking mechanism according to the present invention is a transport vehicle, a transport vehicle, various wheelbarrows, a stroller,
Although it can be used as a braking mechanism for various manually propelled vehicles such as wheelchairs, it can also be used for an autopropelled vehicle having a drive device such as an engine or a motor.

[0025]

The present invention has the following effects. In the first invention of the present application, a braking auxiliary plate is provided between the braking operation rod and the outer peripheral surface of the wheel, and the brake auxiliary plate and the outer peripheral surface of the wheel make surface contact with each other. By turning, the brake assist plate can be rotated about its support shaft and pressed against the wheel in the center direction (left and right direction), so that the braking effect is remarkably improved as compared with the conventional one. Is what you do. According to the second aspect of the present invention, it is not necessary to provide a lock mechanism or the like as a brake release preventing means because of the positional relationship between the braking auxiliary plate and the operating rod and the braking action rod. The operating rod is locked only by making contact with the contact member. In the third invention of the present application, the braking effect is further improved by the position of the support shaft of the braking auxiliary plate. that's all,
The invention of the present application has a very simple effect and exhibits an extremely remarkable effect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an embodiment according to the present invention.

FIG. 2 is a schematic explanatory view showing an operation state of the embodiment shown in FIG. 1;

FIG. 3 is a schematic explanatory view showing an operation state of another embodiment according to the present invention.

FIG. 4 is a schematic explanatory view showing an operation state of still another embodiment according to the present invention.

FIG. 5 is a schematic explanatory view of a part of a braking mechanism in a conventional transport vehicle.

FIG. 6 is a schematic explanatory view showing the operation of a conventional braking mechanism.

[Explanation of symbols]

Reference numeral 10: operating rod, 11: support shaft, 12: braking operation rod, 15:
Contact pin, 20: brake assist plate, 21: support shaft, 50: frame (of bogie), 55: wheel, 60: outer peripheral surface

Claims (3)

[Claims] 1. A braking mechanism for braking and stopping a wheel by pressing a braking rod (12) against an outer peripheral surface of at least one wheel of a vehicle, comprising: In between, a braking auxiliary plate (20), one end of which is axially mounted on the vehicle body, is interposed, and the braking rod (12) presses the braking auxiliary plate (20), whereby the braking auxiliary plate (20) A brake mechanism for a vehicle, wherein braking and stopping of wheels can be performed by pressing an outer peripheral surface. 2. An operating rod (10) for operating a braking operation rod (12) is pivotally mounted on a vehicle body side by a support shaft (11), and a braking operation rod (12) is provided at a tip end of the operation rod (10). When one of the angles formed by the extension line connecting the brake operation rod (12) and the support shaft (11) of the operation rod (10) and the auxiliary brake plate (20) is 90 degrees or more, the operation rod ( 10) or braking rod (12)
The braking mechanism for a vehicle according to claim 1, wherein the operating rod (10) is brought into a locked state by contacting a contact member such as (15). 3. A tangent line which is in contact with an intersection of a straight line connecting the support shaft (11) of the operating rod (10) and the axle of the wheel to be braked, and the locus of rotation of the brake operating rod (12). Position the brake assist plate (2
3. The vehicle braking mechanism according to claim 1, wherein the support shaft (21) is located.