JPH078154U - Braking device for vehicle for transporting goods - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To stop the vehicle gently and reduce the operating force of the brake operating mechanism. [Structure] A support shaft 6 is provided above a wheel 2, and the support shaft connects two ends of two shoe holders 7 to which a brake shoe 11 is attached. Allows you to turn. A tension spring 9 is attached to the tip of the shoe holder via a pulling arm 8 and a connecting pipe is attached to one side surface near the tip via a connecting shaft 15. On the other hand, a brake operation mechanism is provided on the steering wheel of the vehicle, a control wire 24 extends from the operation mechanism, and is connected to a connecting pipe via a pulley 27. When the operating lever is operated, the operating wire is pulled and the brake shoe is pressed against the wheel.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a braking device for an article transporting vehicle having an improved brake shoe pressure contact structure.

[0002]

[Prior art]

 For example, as a braking device for a transportation vehicle used for serving in hospitals and the like, the one disclosed in Japanese Utility Model Publication No. 63-148576 is known. This is configured by providing a lock hole in a wheel mounted under the chassis and allowing a lock pin to be inserted into and removed from the lock hole. This lock pin is always urged by a spring in the direction of entering the lock hole of the wheel.When the brake release mechanism is operated to release the brake, the lock pin comes out of the lock hole and the brake is released. When the brake is operated, the lock pin enters the lock hole of the wheel by the elastic force of the spring and the brake is applied.

[0003]

[Problems to be solved by the device]

 However, as described above, with the configuration in which the lock pin is inserted into the lock hole provided in the wheel to apply the brake, when the brake is operated, the wheel is instantly locked, so the brake is suddenly applied. It will cost you. For this reason, if the brakes are operated while carrying soup dishes such as soup, the vehicle suddenly stops and shakes significantly before and after, causing the soup to spill.

In order to prevent such abrupt braking, it is conceivable that the brake shoes are brought into pressure contact with the wheels and the frictional force thereof is used to gradually decelerate the vehicle. However, in such a brake shoe type braking device, since the pressure contact force of the brake shoe to the wheel influences the effect of the brake, it is necessary to strongly press the brake shoe to the wheel. There is a problem that the operating force becomes excessively large.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a braking device for an article-transporting vehicle that can gently stop the vehicle and reduce the operating force of a brake operating mechanism. Is in the place of providing.

[0006]

[Means for Solving the Problems]

 The braking device for a vehicle for transporting articles according to the present invention is such that a brake shoe provided on a shoe holder is brought into pressure contact with a wheel based on an operation of a brake operating mechanism. Is provided so that it can rotate around the support shaft in the direction of contact and separation, and the action member from the brake operating mechanism is connected near the end of the shoe holder to center the shoe holder based on the brake operation of the brake operating mechanism. The brake shoe is configured to be pressed against the wheel by pivoting it to the wheel, and the distance between the support shaft and the connecting point of the operating member is defined as the distance between the support shaft and the pressure contact of the brake shoe with the wheel. It is characterized in that it is set longer than that (the invention of claim 1).

It is preferable that the brake shoe is attached to a shoe holder so that a corner portion of the brake shoe comes into pressure contact with a wheel by a brake operation (the invention of claim 2). Further, the brake shoe may be detachably attached to the shoe holder so that it can be attached to the vehicle before and after or upside down (the invention of claim 3).

[0008]

[Action]

 According to the braking apparatus of the article transporting vehicle of claim 1, when the brake is operated by the brake operating mechanism to stop the vehicle, the shoe holder is pivoted about the spindle through the acting member, and the brake shoe is actuated. Pressed against the wheels. This creates a frictional force between the brake shoes and the wheels, causing the vehicle to slow down gently and stop. Here, in the present invention, the distance between the support shaft of the brake holder and the connection point of the acting member is set to be longer than the distance between the support shaft and the pressure contact of the brake shoe to the wheel. By the lever principle, the force acting on the brake holder at the connecting point of the action members is doubled and applied to the brake shoe, and the brake shoe is pressed against the wheel with a strong force.

According to the second aspect of the invention, since the corners of the brake shoe are pressed against the wheels, the frictional force on the wheels becomes larger. Further, according to the invention of claim 3, when the brake shoe is worn out, the brake shoe is removed from the shoe holder, and the brake shoe is turned upside down or turned upside down and attached to the shoe holder again. You can This allows one brake shoe to be used repeatedly with the non-frayed side of the brake shoe in pressure contact with the wheel.

[0010]

[Effect of device]

 As described above, according to the braking device for the article transporting vehicle of claim 1, since it is the brake shoe type, it is possible to gently apply the brake, and the "lever principle" allows a small brake operating force. With this, a large braking force can be obtained. Further, according to the invention of claim 2, since the corner portion of the brake shoe is pressed against the wheel to obtain a large frictional force, the brake operating force can be further reduced. Further, according to the invention of claim 3, it is not necessary to immediately replace the brake shoe with a new one even if the brake shoe is worn out due to friction and the effect of the brake is deteriorated, and one brake shoe can be used for a long time. Economic burden is reduced.

[0011]

【Example】

 An embodiment in which the present invention is applied to a catering vehicle used in a hospital or the like will be described below with reference to FIGS. 1 to 9. This car is provided with three pairs of wheels 2 (six in total), which are paired left and right, on the lower surface of the chassis 1 so that they can rotate freely. Each braking mechanism 3 described in detail is provided. In addition, a handle 4 for pushing and moving the car is provided in the front and rear portions of this car, and a brake operating mechanism 20 for operating the braking mechanism 3 is provided on the handle 4. .

<Brake Mechanism 3> Since the brake mechanism 3 has the same structure for the left and right wheels 2, only one of them will be described. As shown in FIGS. 1 and 2, a U-shaped support bracket 5 is attached to the lower side of the chassis 1, and a wheel 2 is rotatably supported at the tip (lower end) thereof. A support shaft 6 is attached above the wheel 2 so as to pass through the support bracket 5 in the left-right direction (perpendicular to the plane of the paper in FIG. 1). A holder 7 is connected at one end thereof, and is supported so as to be rotatable about a support shaft 6 so that the tip end side can be vertically swung.

A pulling arm 8 is connected to the tip of each shoe holder 7 so as to extend obliquely downward, and a tension spring 9 is attached to the tip thereof so that the tip of each shoe holder 7 is always directed upward. Is urged to. Further, the upper end of the lifting arm 8 is bent in an L shape, and a gap adjusting screw 10 is provided here so as to be able to advance and retract in the vertical direction. Therefore, the tip end side of each shoe holder 7 is pulled up by the tension spring 9, and the tip end of the gap adjusting screw 10 is in contact with the lower surface of the chassis 1 and is in a state of extending substantially horizontally as shown in FIG. .

A brake shoe 11 made of rubber, for example, in the shape of a prism is attached to each shoe holder 7, and when the shoe holder 7 is swung downward around the support shaft 6, as shown in FIG. As shown in FIG. 1, one corner 11a of the brake shoe 11 is pressed against the wheel 2. Each brake shoe 11 has a total of three mounting holes 11b penetrating vertically located at the center of the brake shoe 11 and at symmetrical portions on both sides thereof. Of these, the center and the tip side of the brake shoe 11 ( The brake shoe 11 is detachably fixed to the shoe holder 7 by inserting a bolt 12 into a mounting hole 11b located on the right side in FIG. 4). An address plate 13 made of spring steel is sandwiched between the brake shoe 11 and the shoe holder 7 so that the address plate 13 is lifted from the shoe holder 7 by an adjusting screw 14 provided near the base end of the shoe holder 7. The corner portion 11a, which is pushed up and thus the pressure contact portion of the brake shoe 11 with respect to the wheel 2, is pushed up toward the wheel 2 side.

Further, as shown in FIG. 5, a connecting shaft portion 15 is projectingly provided on one side surface of each shoe holder 7 near the tip portion, and those corresponding to the left and right wheels 2 are mutually connected. It is facing. Both ends of the connecting pipe 16 are fitted to the opposing connecting shaft portions 15, and the left and right shoe holders 7 are rotated simultaneously in response to the brake operating mechanism 20 described below.

<Brake Operating Mechanism 20> An operating lever 21 forming a part of the brake operating mechanism 20 is attached to each of the handles 4 mounted on the front and rear of the vehicle via an attachment base portion 22. Is rotatable about the lever support shaft 23. A guide tube 24a of a control wire 24 is connected to the mounting base 22, and an operating wire 24b of the control wire 24 is connected to the operating lever 21. Only the operating wire 24b is pulled based on the pulling operation of the operating lever 21. It is designed to be used. The control wire 24 has a well-known configuration in which an actuating wire 24b made of a flexible steel rope is inserted into a flexible guide tube 24a, and the actuating wire 24b is referred to in this embodiment. It corresponds to an action member. A lever holding hook 25 is attached to the handle 4 corresponding to the tip of the operation lever 21, and when the operation lever 21 is pulled, the tip is hooked on the lever holding hook 25 and pulled. Can be kept at.

On the other hand, on the lower side of the chassis 1, as shown in FIG. 2, a pulley 27 is rotatably provided via a support plate 26 in the center between the wheels 2 and 2 provided with a braking mechanism 3. The other end of the guide tube 24a of the control wire 24 is fixed to the supporting plate 26, and the other end of the actuating wire 24b is turned upward by the pulley 27 so that the connecting pipe 16 of the braking mechanism 3 is connected. It is connected. As a result, when the operating lever 21 is pulled, the connecting pipe 16 can be pulled down through the operating wire 24b.

Next, the operation of this embodiment will be described. To stop the serving car, pull the operating lever 21 of the brake operating mechanism 20. Then, the operating wire 24b in the control wire 24 is pulled in the direction of the arrow a in FIG. 3, and the connecting pipe 16 is pulled down, so that the shoe holder 7 resists the elasticity of the tension spring 9 and the supporting shaft 6 Is rotated in the direction of arrow b. As a result, the corner portion 11a of the brake shoe 11 is pressed against the wheel 2 rotating in the direction of arrow c, the wheel 2 is rapidly decelerated by the frictional force between the wheel 2 and the brake shoe 11, and the serving car is stopped. In the case of this configuration, since the wheel 2 is decelerated by using the frictional force, the brake can be applied more gently than the conventional method of locking the wheel by using the pin, and the wheel is loaded on the vehicle. Spilled food such as soup can be reliably prevented from spilling.

By the way, when stopping the vehicle as described above, the braking force is determined by the frictional force between the brake shoe 11 and the wheel 2, and thus is determined by the pressure contact force of the brake shoe 11 to the wheel 2. It In view of this point, in the present embodiment, the point of action of the force on the shoe holder 7, that is, the connection point A of the operation wire 24b of the brake operating mechanism 20 is set as the connection pipe 16 corresponding to the tip of the shoe holder 7, and the shoe holder 7 is connected. The distance h1 between the support shaft 6 and the connecting point of the operating wire 24b is longer than the distance h2 between the support shaft 6 and the pressure contact B of the brake shoe 11 for the vehicle wheel 2 ( h1> h2). As a result, by the "lever principle", the pressure contact force f2 at the point B of the brake shoe 11 is amplified by h1 / h2 times the pulling force f1 at the connection point A of the actuation wire 24b, Even if the operating lever 21 of the brake operating mechanism 20 is pulled with a light force, the brake shoe 11 can be pressed against the wheel 2 with a strong force. Therefore, it is possible to reduce the brake operation force for obtaining the required braking force, even though it is the brake shoe type. Moreover, in this embodiment, since the corner portion 11a of the brake shoe 11 is brought into pressure contact with the wheel 2, a stronger pressure contact force can be obtained as compared with the configuration in which the flat surface of the brake shoe 11 is brought into pressure contact with the wheel 2. From this aspect as well, it becomes possible to reduce the brake operation force for obtaining the required braking force.

By the way, when the brake operation is repeatedly performed, the corner portion 11 a of the brake shoe 11 is worn away due to the friction between the brake shoe 11 and the wheel 2, and the gap between the brake shoe 11 and the wheel 2 is widened. Then, it is feared that even if the operating lever 21 is strongly gripped, the pressure contact force of the brake shoe 11 with respect to the wheel 2 cannot be increased, and a sufficient braking force cannot be obtained. In this regard, in this embodiment, since the shoe holder 7 is provided with the gap adjusting screw 10, the brake shoe 11 is rotated by rotating the shoe holder 7 about the support shaft 6 in the direction of the arrow b. It is possible to narrow the gap between the corner 11a and the wheel 2. Further, such adjustment can be performed by rotating the adjusting screw 14 provided at the base end portion of the shoe holder 7 so that the brake shoe 11 is projected to the wheel 2 side.

Further, when the brake shoe 11 is worn out and the clearance between the brake shoe 11 and the wheel 2 cannot be narrowed even by the clearance adjusting screw 10 and the adjusting screw 14, the brake shoe 11 Remove the two bolts 12 fixing the brake shoe 11 to the shoe holder 7 and remove the brake shoe 11 from the shoe holder 7. Then, the brake shoe 11 is turned upside down and again fixed to the shoe holder 7 with the two bolts 12. As a result, the new non-worn corner portion 11a comes into pressure contact with the wheel 2, so that the braking force is restored. Further, when the corner portion 11a is further worn, the brake shoe 11 is removed from the shoe holder 7 again in the same manner as the above-described work, this time the front and rear of the brake shoe 11 is reversed and the shoe holder 7 is again bolted to the shoe 12. It only has to be fixed, so that the new corner 11a is pressed against the wheel 2. In this case, since three mounting holes 11b are formed in the brake shoe 11 at equal intervals in the front-rear direction, even if the front-rear direction is reversed, the brake shoe 11 is fastened with the two bolts 12 in the same manner as the above-mentioned work. Can be fixed to the shoe holder 7.

As described above, according to the present embodiment, since the brake shoe type uses the frictional force, a gentle braking force is generated to prevent spilled soup dishes such as soup loaded in the car. It is possible to obtain a sufficient braking force even with a small braking force. Also, even if the corners 11a of the brake shoe 11 are worn out and the braking effectiveness deteriorates, the four corners of the brake shoe 11 can be used, so there is no need to immediately replace the brake shoe with a new brake shoe 11 and the economic burden is reduced. To do. The present invention is not limited to the above embodiment, and various modifications may be made without departing from the spirit of the invention, for example, a metal rod may be used as an operating member instead of the control wire 24. It is possible.

[Brief description of drawings]

FIG. 1 is a side view showing a braking mechanism.

FIG. 2 is a perspective view showing a braking mechanism.

FIG. 3 is a side view showing a brake operation state.

FIG. 4 is a vertical sectional view showing a brake shoe.

FIG. 5 is a top view showing a braking mechanism.

FIG. 6 is a perspective view showing a brake operating mechanism.

FIG. 7 is a partially enlarged side view showing a state where the brake shoes are pressed against the wheels.

FIG. 8 is a side view showing the entire catering car.

FIG. 9 is a rear view showing the entire catering car.

[Explanation of symbols]

2 ... Wheels 3 ... Braking mechanism 6 ... Spindle 7 ... Shoe holder 11 ... Brake shoe 11a ... Corner 24b ... Actuating wire (acting member) 20 ... Brake operating mechanism A ... Connection point B ... Pressure contact

Claims (3)

[Scope of utility model registration request] 1. A brake shoe provided on a shoe holder is brought into pressure contact with a wheel based on an operation of a brake operating mechanism, wherein the shoe holder is brought into contact with or separated from the wheel. Is provided so as to be pivotable about a support shaft, and an action member from the brake operating mechanism is connected to the end portion of the shoe holder so that the shoe holder is centered on the support shaft based on a brake operation of the brake operating mechanism. The brake shoe is brought into pressure contact with the wheel by turning the support shaft to the wheel, and the distance between the support shaft and the connecting point of the acting member is determined by pressing the support shaft and the brake shoe against the wheel. A braking device for a vehicle for article transportation, wherein the braking device is set longer than a distance between the points. 2. The braking device for an article transporting vehicle according to claim 1, wherein the brake shoe is attached to the shoe holder so that a corner portion of the brake shoe comes into pressure contact with the wheel by the brake operation. . 3. The brake shoe according to claim 1 or 2, wherein the brake shoe is detachably attached to the shoe holder and can be attached to a vehicle by being turned upside down or upside down. Braking device for a vehicle for transporting goods.