JP2008179252A - Brake device for truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake device capable of obtaining consistent and reliable braking force without being affected by the state of a traveling surface of a wheel. <P>SOLUTION: When a brake pedal is stepped in, a lever 11 is moved downwardly, a fore end of an arm part 14a of a rod engaged with the lever 11 is moved downwardly to turn a shaft part 14b, and a plate 16 fixed to a fore end of the shaft part 14b is turned. By the turn of the plate 16, a brake bar 17 connected to both ends of a flat surface part 16a of the plate 16 is projected toward a brake wheel 19 fixed to a wheel 18 of a tire 2, inserted in a recess 19b formed on an opening circumferential edge side of the brake wheel 19, and engaged therewith to realize the completely impossible rotation of the tire 2. The effectiveness of the brake is not affected according to the state of a tire outer circumferential surface like a brake device for pressing the tire outer circumferential surface, the rotation of the tire can be consistently and reliably locked, and the safety can be enhanced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a carriage brake device for operating a brake on a wheel attached to a lower portion of a carriage so that the carriage cannot be moved.

  In general, carts such as hand carts and lighting projectors are used for the purpose of loading an object and moving it to a predetermined location, and therefore are often equipped with a brake device. In particular, it is essential to provide a brake device for safety when moving a cart loaded with heavy objects manually.

Conventionally, as a brake device for such a cart, there are many types that press the wheels of the cart from the running surface side (outer peripheral side), and are disclosed in Patent Document 1, for example. In the brake device disclosed in Patent Document 1, the brake shoe presses the outer peripheral surface of the tire so that it cannot rotate by stepping on the brake pedal provided on the dolly of the lighting device.
JP 2002-25330 A

  However, since the conventional braking device as disclosed in Patent Document 1 presses the traveling surface side of the wheel, the effectiveness of the brake depends on the state of the traveling surface of the wheel, and a stable braking force can be obtained. Have difficulty. That is, if oil adheres to the outer peripheral surface of the tire or the air pressure decreases, the frictional force between the pressing member such as a brake shoe and the outer peripheral surface of the tire decreases and slips, resulting in a strong braking force. Can't get.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cart brake device that can obtain a stable and reliable braking force without being influenced by the state of a running surface of a wheel. .

  In order to achieve the above object, a cart brake device according to the present invention is a cart brake device that operates a brake on a wheel attached to a lower portion of the cart, thereby disabling the cart, and performs a brake operation. The brake operation unit is connected to the brake operation unit, and is connected to the brake operation transmission unit that converts the operation of the brake operation unit by the brake operation into a rotation operation. The brake operation transmission unit is connected to the brake operation transmission unit. A brake mechanism for converting the turning motion transmitted from the vehicle into a forward / backward motion in the direction of the wheel, and a brake actuating portion provided on the wheel for operating the brake on the wheel by the forward / backward motion of the brake mechanism. It is characterized by that.

  The truck brake device according to the present invention can obtain a stable and reliable braking force without being influenced by the state of the running surface of the wheel.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 relate to an embodiment of the present invention, FIG. 1 is a side view of a projector, FIG. 2 is a rear view of the projector, FIG. 3 is an explanatory view around a brake pedal, and FIG. FIG. 5 is a perspective view of the brake wheel.

  In FIG. 1, reference numeral 1 denotes a projector to which the present invention is applied in this embodiment. The bogie 4 of the projector 1 rotatably supports a front wheel tire 2 via a front wheel support portion 3b, and a rear wheel tire 2 via a rear wheel support portion (not shown) so as to be rotatable at the lower portion of the chassis 3. . A telescopic mast 5 is erected in the center of the rear part of the carriage 4, and an illumination lamp 6 is supported above the mast 5 so that the direction of projection and the angle can be adjusted. As shown in FIG. 1, the illumination lamp 6 is a four-lamp type lamp arranged in the vertical and horizontal directions. For example, a high intensity discharge (HID) lamp such as a metal halide lamp, a high-pressure sodium lamp, or a mercury lamp. The electric power is supplied by the generator 7 mounted on the chassis 3 or a commercial power source.

  Further, as shown in FIG. 2, a steering handle 8 for moving and changing the direction of the projector 1 and a foot-operated brake pedal for braking the tire 2 during the movement are provided at the rear of the carriage 4. 9. An outrigger 10 for fixing the projector 1 at a desired position is attached to the chassis 3. In this embodiment, the carriage 4 is rear wheel steering, and the carriage 4 is immovable by applying a brake to the front wheel side.

  As shown in FIGS. 3 and 4, the brake pedal 9 includes a first lever 11 formed in an elongated flat plate shape that is slightly curved at one end side, and a second lever 12 formed of a flat plate member. Is arranged so as to be swingable at a predetermined angle. One end of the first lever 11 is pivotally attached to one end of the second lever 12, and a brake pedal 9 is fixed to the other end at a predetermined angle. A recess 9 a that is recessed toward the brake pedal 9 is provided in the vicinity of the brake pedal 9 in the first lever 11, and can be fitted to a protrusion 3 a provided at the rear of the chassis 3. Yes. On the other hand, the second lever 12 is connected to the upper side of the chassis 3 via a return spring 13 having a substantially central portion made of a tension spring, and one end side thereof rotates with the one end side of the first lever 11 as described above. The other end side is pivotally attached to the lower portion of the chassis 3 so as to be freely rotatable.

  The brake pedal 9, levers 11 and 12, and return spring 13 form a brake operation unit, and the brake is operated and released by operating the brake pedal 9.

  That is, in this embodiment, as shown in FIG. 3, when the brake pedal 9 is depressed (the two-dot chain line state is changed to the solid line state), the biasing force of the return spring 13 attached to the second lever 12 is increased. In contrast, the first lever 11 moves downward. This moving operation acts on a brake wheel 19 which is a brake operating unit described later, and the brake is operated on the tire 2. At this time, since the recess 9a of the brake pedal 9 is fitted into the protrusion 3a of the chassis 3, even when the brake pedal 9 is released from the foot, the state where the brake pedal 09 is depressed, that is, the brake operating state is reliably maintained. Can do.

  On the other hand, when the state in which the brake pedal 9 is depressed is released (the solid line state is changed to the two-dot chain line state), the second lever 12 is moved upward (upper side of the chassis 3) by the urging force of the return spring 13. The first lever 11 is attracted and moved upward. By this moving operation, the brake acting on the tire 2 via the brake wheel 19 is released. In order to release the fitting between the recess 9a of the brake pedal 9 and the chassis 3 projection 3a, the brake pedal 9 may be pushed forward slightly with a foot or the like and kicked up.

  The rod 14 includes a substantially straight rod-shaped shaft portion 14b and an arm portion 14a formed by bending an end portion thereof into a substantially L shape. The distal end of the arm portion 14 a is inserted into and engaged with a long hole 11 a provided on one end side of the lever 11. Further, the shaft portion 14 b extends through the chassis 3 toward the front of the carriage 4, is supported by the chassis 3 in a support portion 14 c in the middle of the chassis 3, and the tip side is connected to the link mechanism 15. ing.

  As shown in FIGS. 3 and 4, the link mechanism 15 includes a plate-like plate 16 disposed slightly offset from the center of rotation of the front wheel tire 2 to the front of the carriage 4, and a relatively thick plate-like member. And two brake bars 17 formed in the above manner. The front end side of the shaft portion 14b of the rod 14 is fixed at the center of the plate 16, and one end side of the brake bar 17 is rotatably supported at both ends of the plate 16. Further, the other end side of the brake bar 17 is formed in a taper shape, and protrudes outward from a front wheel support portion 3 b provided on the left and right sides of the chassis 3. The brake bar 17 of this embodiment is supported by a brake bar 17 extending leftward from the front of the projector 1 on the upper end side of the plate 16 and extending rightward to the lower end side of the plate 16. 17 is pivotally supported.

  The link mechanism 15 including the plate 16 and the left and right brake bars 17 converts the rotation of the rod 14 into the forward / backward movement of the brake bar 17. That is, when the brake pedal 9 is depressed and the lever 11 is lowered, the tip of the arm portion 14a of the rod 14 engaged with the lever 11 through the elongated hole 11a moves downward, and the shaft portion 14b of the rod 14 is moved downward. Rotate. As the shaft 14b of the rod 14 rotates, the plate 16 fixed to the tip of the shaft 14b of the rod 14 rotates (counterclockwise in FIG. 4), and the tips of the left and right brake bars 17 are rotated. Operates in the protruding direction. As will be described later, the rod 14 is made of an elastic material and transmits rotation to the plate 16 while acting as a torsion bar.

  A brake wheel 19 as a brake operation unit is fixedly provided on the inner ring side of the wheel 18 of the front tire 2. As shown in FIG. 5, the brake wheel 19 is formed in a bottomed cylindrical shape, and includes a bottom surface portion 19c, a plurality of mounting holes 19a for screwing the wheel 18 into the bottom surface portion, and a bottomed cylinder. And a plurality of trapezoidal recesses 19b formed at predetermined intervals around the periphery of the opening. Then, the brake wheel 19 is fixed to the wheel 18 by circumscribing the bottom surface portion 19c to the inner ring side of the wheel 18 and inserting a bolt or the like into the mounting hole 19a. In addition, the tip of the brake bar 17 can be inserted into and removed from the recess 19b of the brake wheel 19, and the brake operates when the tip of the brake bar 17 engages with the recess 19b. The tip of the brake bar 17 extends from the recess 19b. The brake is released when it is released.

    Next, the effect | action of this form by such a structure is demonstrated.

  When the brake pedal 9 is depressed to operate the brake, the first lever 11 is lowered downward against the urging force of the return spring 13, and the tip of the arm portion 14a of the rod 14 is also moved downward. As a result, the shaft portion 14b of the rod 14 rotates (counterclockwise in FIG. 4), and the plate 16 fixed to the tip of the shaft portion 14b rotates in the same direction.

  Due to the rotation of the plate 16, the brake bar 17 connected to both ends of the flat portion 16 a of the plate 16 is moved from the position indicated by the broken line in FIG. 4 to the recess 19 b of the brake wheel 19 fixed to the wheel 18 of the tire 2. Protrusively. As a result, as shown by a solid line in FIG. 4, the tip of the brake bar 17 is inserted into and engaged with the recess 19b, and the tire 2 can be made non-rotatable. At this time, as shown in FIG. 3, the recess 9 a of the brake pedal 9 is fitted and locked to the protrusion 3 a of the chassis 3, and the brake operating state is maintained even when the foot is released from the brake pedal 9.

  On the other hand, when the brake pedal 9 is released to release the brake, the biasing force of the return spring 13 raises the first lever 11 and the tip of the arm portion 14a of the rod 14 also moves upward. Thereby, the shaft portion 14b of the rod 14 is rotated (clockwise in FIG. 4), and the plate 16 is rotated in a direction (clockwise in FIG. 4) for retracting the brake bar 17 into the chassis 3. As a result, the tip of the brake bar 17 is detached from the recess 19b, and the brake of the tire 2 is released.

  Thus, since the brake operating part does not function in the state where the brake pedal 9 is not depressed, the floodlight 1 can grip and move the steering handle 8. In addition, after the projector 1 is stopped at a predetermined position, the brake operating portion is operated by depressing the brake pedal 9 and the outrigger 10 is lowered to be grounded to be fixed at a desired position.

  The rod 14 may be a rigid shaft with minimal torsional deformation and the plate 16 may be rotated integrally. However, the tip of the brake bar 17 is inserted into the recess 19b of the brake wheel 19 to ensure that There is a risk that the brake operation will be somewhat unnatural until they are engaged. That is, when the rod 14 is a rigid shaft, the reaction force from the brake wheel 19 is transmitted to the brake pedal 9 when the tip of the brake bar 17 comes into contact with the peripheral edge of the opening other than the recess 19 b of the brake wheel 19. Further, since the engagement timing of the brake bar 17 and the recess 19b is often different on the left and right, the operator must keep stepping on the brake pedal 9 with a relatively strong force until the left and right brake bars 17 engage with the recess 19b. The pedal force of the brake pedal 9 changes unnaturally.

  Therefore, in this embodiment, the rod 14 is formed of an elastic material so as to function as a torsion bar. That is, the rod 14 accumulates the depression force of the brake pedal 9 as torsional energy of the shaft portion 14b when the tip end of the brake bar 17 is in contact with the opening peripheral edge other than the recess 19b of the brake wheel 19. Then, the torsional energy acts as a pressing force for the brake bar 17 to press the brake wheel 19, so that the brake bar 17 can be reliably engaged with the recess 19 b while the depression force of the brake pedal 9 is substantially constant. Can do. In addition, even when only one brake bar 17 is engaged with the recess 19 b of the brake wheel 19, the other brake bar 17 can continue to apply a pressing force to the other brake wheel 19. Accordingly, the left and right brake bars 17 can be engaged with the recesses 19b of the brake wheel 19 while suppressing the reaction force to the brake pedal 9, and the brake can be applied without causing a sense of incongruity.

  Further, the brake wheel 19 may be formed integrally with the wheel 18 of the tire 2. Furthermore, instead of the brake wheel 19 provided with a plurality of recesses 19b on the peripheral edge of the bottomed cylindrical opening, a plurality of opening holes into which the tips of the brake bars 17 are inserted and removed are provided in the wheel 18 of the tire 2 in the circumferential direction. A brake part may be formed by disposing in the above.

  Next, another embodiment in which the mounting position of the brake bar 17 is different from this embodiment will be described. Since this other form is the same as the present form except for the mounting position of the brake bar 17, the description thereof will be omitted.

  In this alternative embodiment, as shown in FIG. 6, a brake bar 17 extending to the right side is pivotally supported on the upper end side of the plate 16 from the front of the projector 1 of the plate 16, and a brake bar 17 extending to the left side is provided. It is pivotally supported on the lower end side of the plate 16.

  In this alternative embodiment, when the brake pedal 9 is depressed, the first lever 11 is lowered downward against the urging force of the return spring 13, and the tip of the arm portion 14a of the rod 14 is also moved downward. By the movement of the arm portion 14a of the rod 14, the shaft portion 14b of the rod 14 rotates (counterclockwise direction in FIG. 6), and the plate 16 fixed to the tip of the shaft portion 14b has the same direction (FIG. 6). In the counterclockwise direction).

  By the rotation of the plate 16, the brake bar 17 moves backward from the state where it is engaged with the recess 19b of the brake wheel 19 indicated by the broken line in FIG. 6 to the position where it is separated from the recess 19b indicated by the solid line, and the brake is released. .

  On the other hand, when the brake pedal 9 is released, the first lever 11 is raised upward by the urging force of the return spring 13, and the tip of the arm portion 14a of the rod 14 is similarly moved upward. The movement of the arm portion 14a of the rod 14 causes the shaft portion 14b of the rod 14 to rotate (clockwise in FIG. 6), and the plate 16 fixed to the tip of the shaft portion 14b moves in the same direction (in FIG. 6). Rotate clockwise. As a result, the brake bar 17 protrudes from the position indicated by the solid line in FIG. 6 toward the concave portion 19b of the brake wheel 19 and meshes, thereby causing the tire 2 to operate the brake.

  In this embodiment and another embodiment, the brake pedal 9 is arranged on the left side of the mast 5 from the front of the projector 1, but when this is arranged on the right side, the link in this embodiment or another embodiment is provided. The mechanism 15 may be arranged symmetrically with respect to the mast 5 as an axis.

  As described above, in the brake device of the present embodiment, the braking effect is not affected by the state of the tire outer peripheral surface unlike the conventional brake device that presses the tire outer peripheral surface, and the rotation of the tire is stably and reliably performed. Can be locked and stopped, and safety can be further improved.

Floodlight side view Rear view of floodlight Explanation diagram around the brake pedal Explanatory drawing of the brake mechanism in this form Brake wheel perspective view Explanatory drawing of the brake mechanism in another form

Explanation of symbols

2 tires (wheels)
4 cart 9 brake pedal (brake operation part)
11, 12 Lever (brake operation part)
13 Return spring (brake operation part)
14 Rod (brake operation transmission part)
15 Link mechanism (brake mechanism)
16 Plate (brake mechanism)
17 Brake bar (brake mechanism)
19 Brake wheel (brake operating part)
19b recess

Claims (5)

A brake device for a carriage that applies a brake to a wheel attached to a lower part of the carriage to make the carriage impossible to move,
A brake operation unit for performing a brake operation by an operator;
A brake operation transmission unit that is connected to the brake operation unit and converts an operation of the brake operation unit by an operator's brake operation into a rotation operation;
A brake mechanism unit that is connected to the brake operation transmission unit and converts a rotation operation transmitted from the brake operation transmission unit into an advance / retreat operation in the wheel direction;
A carriage brake device, comprising: a brake actuating part provided on the wheel and actuating a brake on the wheel by a forward and backward movement of the brake mechanism part.   The brake mechanism unit includes a rotation member that rotates by a rotation operation transmitted from the brake operation transmission unit, and an advance / retreat member that is connected to an end of the rotation member and moves forward and backward in the wheel direction. The trolley brake device according to claim 1, wherein:   The brake device for a truck according to claim 2, wherein the brake operating portion has a plurality of concave portions into which front and rear ends of the advancing and retracting members are inserted and removed.   The said brake operation transmission part was formed with the torsion bar, The brake device for carts as described in any one of Claims 1-3 characterized by the above-mentioned. A brake device for a carriage that applies a brake to a wheel attached to a lower part of the carriage to make the carriage impossible to move,
A brake pedal fixed to a lever disposed on the rear side of the carriage and operated by an operator;
A lever that extends from the brake pedal and transmits brake pedal operation;
A rod extending in the front-rear direction of the carriage, connected to the lever and pivoted by the operation of the lever;
A plate disposed on the front side of the carriage and connected to the rod;
A brake bar connected to a position away from a position connected to the rod of the plate and extending in the wheel direction, and moving forward and backward in the wheel direction through the plate by the rotation of the rod;
A brake device for a carriage, comprising: a brake wheel connected to the brake bar and configured to apply a brake to the wheel by an advance / retreat operation of the brake bar.

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