TW201502053A - Braking device of hand-operated dray vehicle - Google Patents

Abstract

The subject of the present invention is to provide a braking device of hand-operated dray vehicle with enhanced operability. To solve the problem, there is provided a braking device (10) installed in a hand-operated dray vehicle to brake the vehicle wheels. The hand-operated dray vehicle includes: a main body part (26) for connecting a plurality of fork arms to be capable of moving up and down, and vehicle wheels mounted to the bottom of the main body part for moving. The device includes: a tilt member (12) supported on the main body part for being tilted toward the vehicle wheels; a pressing and jointing part arranged on the tilt member for pressing and jointing the vehicle wheels; and a bouncing means configured between the main body part and the tilt member for bouncing the tilt member toward the direction away from the vehicle wheels in a normal state; and a pedal member (15) fastened to the tilt member for being stepped down by the bouncing force that resists the bouncing means, so as to press and joint the pressing and jointing part to the vehicle wheels.

Description

Brake device for manual pallet truck

The invention relates to a brake device for a manual pallet truck, which is mounted on a manual pallet truck and brakes a wheel. The manual pallet truck has a body portion that connects a plurality of fork arms into a liftable body, and is disposed on the body. The wheel for traveling in the lower part.

For example, Patent Document 1 discloses a brake device that is mounted on a manual pallet truck used for transporting goods and that brakes a wheel on which the manual pallet truck travels. In the brake device of Patent Document 1, the brake portion that is press-fitted to each of the wheels is slidably attached to the shaft of the pair of left and right wheels, and is slidably slid in the axial direction of the rod. The biasing portion is externally attached to the rod in front of the braking portion, and the biasing portion biases the braking portion in a direction away from each of the wheels, and a pedal portion is disposed behind the braking portion to the rod, and the pedal portion is resistant to the elastic portion The pressure causes the aforementioned brake portion to be crimped to each of the wheels. Then, the pedal portion is externally fitted to the rod so as to be rotatable around the axis of the rod, and the left and right side surfaces of the pedal portion have a step for the operator to step on the foot toward the outside of each side surface. unit.

In order to make the brake device operate, the operator steps on the tread portion on the right side of the pedal portion with the foot, and the tread portion abuts against the stopper formed on the brake portion, and the pedal portion is wound in a clockwise direction. When the shaft of the lever rotates, the pedal portion causes the brake portion to slide toward the respective wheel sides against the elastic pressure of the biasing portion. As a result, the braking portion is pressed against the outer circumferential surface of each wheel to brake the respective wheels. On the other hand, in order to change the brake device from the operating state to the non-operating state, the tread portion on the left side of the pedal portion is stepped on, and the cam portion formed on the pedal portion is fitted to the cam portion formed in the braking portion, and the pedal portion is The counterclockwise direction rotates around the axis of the rod. As a result, the braking portion is biased toward the direction away from each wheel by the elastic pressure of the biasing portion, and as a result, the braking of each wheel is released.

[Previous Technical Literature] [Patent Document]

[Patent Document 1] Japanese Patent No. 4,436,301

However, in the above-described brake device, in order to be in an operating state, it is necessary to operate the right tread portion of the pedal portion, and in order to change from the operational state to the non-operating state, it is necessary to operate the left tread portion of the pedal portion. As described above, when the brake device is brought into an operating state and the non-operating state is required, different operations are required, and it is difficult for the operator to perform the operation of the brake device.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a brake device for a manual pallet truck that improves operability.

A brake device for a manual pallet truck according to the invention of claim 1 is mounted on a manual pallet truck and brakes the wheel, the manual pallet truck having: a body portion for connecting a plurality of fork arms to be lifted and lowered, and a wheel for traveling in a lower portion of the main body portion, comprising: a tilting member supported to be tiltable toward the wheel; and a crimping portion provided on the tilting member and crimpable a wheel; and a biasing means disposed between the body portion and the tilting member, and biasing the tilting member in a direction away from the wheel in a normal state; and a pedal member that is locked to the tilting member by resisting The elastic pressure of the biasing means is depressed to press the crimping portion to the wheel.

The invention of claim 2 is characterized in that the method of claim 1 is characterized in that: the interval adjusting means for adjusting the interval between the wheel and the crimping portion by changing the inclination angle of the tilting member to the main body portion; The stepping amount adjusting means for adjusting the amount of depression of the pedal portion by moving the stepping member forward and backward with respect to the tilting member in the stepping direction of the pedal member.

The invention of claim 3, wherein the interval adjusting means comprises: a fixing member fixed to the tilting member and having a screw hole extending toward the body side; and a screw member The front end portion is screwed to the screw hole from the fixing member toward the body side, and is blocked by the front end portion abutting against the body portion The tilting of the tilting member changes the amount of protrusion of the tip end portion to the fixing member by moving the screw member forward and backward of the main body portion, and the tilt angle can be changed.

The invention of claim 4, wherein the stepping amount adjusting means includes: a screw shaft that is screwed to the pedal member and that is locked to the tilting member and extends toward the stepping direction; And the nut member is screwed to the screw shaft so as to be movable in the stepping direction, and the pedal member is moved forward and backward with respect to the tilting member by moving the nut member in the stepping direction along the screw shaft.

The invention of claim 5, wherein the tilting member supports the one end side of the tilting member as a tilting fulcrum and is supported by the main body portion, and the tilting fulcrum The distance from the other end side of the tilting member is set to be larger than the distance between the tilting fulcrum and the crimping portion.

According to the brake device for the manual pallet truck of the invention of claim 1, in order to make the brake device into an operating state, the pressing portion can be pressed against the wheel and braked by pressing the pedal member against the elastic pressure of the biasing means. wheel. Further, in order to change the brake device from the operating state to the non-operating state, the operation of stepping on the pedal member is stopped, and the biasing means biases the crimping portion (tilting member) away from the wheel, thereby releasing the braking of the wheel. Therefore, the operation of making the brake device into an operating state or a non-operating state is simplified, so that the operability of the brake device can be improved.

According to the invention of claim 2, the interval between the wheel and the crimping portion can be arbitrarily set by the interval adjusting means. Therefore, even if the wheel outer shape is reduced, for example, when the wheel is worn, the crimping portion can be crimped to The wheel can be easily adjusted to bring the crimping portion close to the wheel. Further, the amount of depression of the pedal member can be arbitrarily set by the depression amount adjusting means, whereby the operation of reliably pressing the crimping portion to the wheel becomes possible. Thereby, the braking performance of the brake device can be well maintained.

According to the invention of claim 3, the inclination angle of the tilting member to the main body portion can be easily changed by a simple operation of changing the amount of protrusion of the front end portion of the screw member to the fixing member.

According to the invention of claim 4, the pedal member can be easily tilted toward the tilting member by a simple operation of moving the nut member toward the stepping direction of the pedal member along the screw shaft that is locked to the tilting member and screwed to the pedal member. advance and retreat.

According to the invention of claim 5, when an external force is applied to the other end side of the tilting member to approach the wheel, the distance from the tilting fulcrum to the other end side of the tilting member is determined from the tilting fulcrum to The ratio of the distances from the crimping portion can make the force acting on the crimping portion larger than the external force applied to the other end side of the tilting member. Thereby, even if a small external force is applied to the other end portion, the crimping portion can apply a force larger than the external force to the wheel, and the braking force of the brake device can be increased.

1‧‧‧Manual pallet truck

2‧‧‧ Body Department

3‧‧‧ Rear wheel

5‧‧‧ Fork Arm

10‧‧‧ brakes

12‧‧‧ tilting members

13‧‧‧ leaf spring

14‧‧‧ coil spring

15‧‧‧ pedal member

32‧‧‧ tilting axis

54‧‧‧ Screw-screw components

55‧‧‧ screw holes

56‧‧‧ screws

64‧‧‧ screw shaft

65‧‧‧ Nut components

L1‧‧‧Distance between the center of the tilting shaft and the lower end of the rear wheel cover

L2‧‧‧Distance between the center of the tilting shaft and the sum of the leaf springs and the crimping parts of the rear wheels

Fig. 1 is an overall perspective view of a manual pallet truck to which a brake device of an embodiment of the present invention is mounted.

Fig. 2 is an overall perspective view of the brake device of Fig. 1.

Fig. 3 is a first exploded perspective view of the brake device of Fig. 1 when viewed from the side.

Fig. 4 is an exploded perspective view of the brake device of Fig. 1 when viewed from obliquely rearward.

Figure 5 is a second exploded perspective view of the brake device of Figure 1 as viewed from the same side.

Fig. 6 is an overall perspective view of a joint member provided in the brake device of Fig. 1;

Fig. 7 is an overall perspective view of a tilting member provided in the brake device of Fig. 1.

Figure 8 is a front elevational view of the tilting member of Figure 7.

Figure 9 is a side elevational view of the tilting member of Figure 7.

Fig. 10 is a view for explaining an operation of changing the brake device of Fig. 1 from a non-operating state to an operating state.

Fig. 11 is a view for explaining the operation of the leaf spring provided in the brake device of Fig. 1 for braking the rear wheel.

An embodiment of the present invention will be described with reference to Figs. 1 to 11 . The manual pallet truck 1 shown in Fig. 1 is intended to transport a pallet on which goods are placed. In the manual pallet truck 1, a pair of left and right rear wheels 3, 3 are provided. In the lower portion of the main body portion 2, a pair of right and left fork arms 5, 5 are provided in the main body portion 2 so as to be movable up and down.

Each of the fork arms 5 is for inserting into the insertion opening of the pallet, and each of the fork arms 5 is provided with a front wheel 6 at a lower end side thereof. Then, a vertical frame 7 is continuously provided at the rear of the two fork arms 5 (lower left in Fig. 1). Further, a hydraulic cylinder 8 is provided in the main body portion 2, and a vertical frame 7 is coupled to the upper end of the hydraulic cylinder 8. Further, a grip 9 for manually operating the hydraulic cylinder 8 is provided in the main body portion 2. The operator operates the grip 9 to elongate the hydraulic cylinder 8, thereby causing the vertical frame 7 to rise together with the two fork arms 5, 5. Along with this, the two fork arms 5, 5 can lift the pallet in a horizontal state. On the other hand, when the operator releases the hydraulic pressure of the hydraulic cylinder 8 by operating the release lever 9A of the grip 9, and the hydraulic cylinder 8 is contracted, the vertical frame 7 can be lowered together with the two fork arms 5 and 5. Further, the operator operates the grip 9 by pushing and pulling, and the front wheel 6 and each of the rear wheels 3 can be rotated to cause the manual carriage 1 to travel.

As shown in FIGS. 1 and 2, the manual pallet truck 1 is provided with a brake device 10 for braking the rear wheels 3, 3. The brake device 10 has a joint member 11, and a tilting member 12, and leaf springs 13, 13, and coil springs 14, 14 and a pedal member 15. The joint member 11 is attached to a rear wheel support member 26 (see FIGS. 3 to 5) which will be described later, and includes side plates 20 and 20 which are opposed to each other in the left-right direction as shown in FIGS. 3, 4 and 6. And a vertical plate 21 that is joined to the inner faces of the side plates 20, 20 and protrudes upward from the upper surfaces of the side plates 20, 20; and extends horizontally in the opposing direction of the side plates 20, 20, And reinforcing plate 22 fixed to the lower part of the inner faces of the two sides plates 20, 20; and clamping the rear wheel branch together with the vertical plate 21 The pressing plate 23 of the stay member 26.

As shown in FIG. 3, FIG. 5, and FIG. 6, each of the both side plates 20 is provided with a notched portion 25 which is cut into a continuous semicircular shape in front of each side plate 20. As shown in FIG. 3 and FIG. 4, a cylindrical rear wheel support member 26 is protruded from a lower end of the hydraulic cylinder 8 provided in the main body portion 2, and the rear wheel support member 26 is provided with a left-right direction. A through hole (not shown) that penetrates the rear wheel support member 26. Further, on the circumferential surface of the rear wheel support member 26, a pair of left and right tubular portions 27 and 27 that communicate with the through holes are protruded. Rotatable shaft members 28 attached to the rear wheels 3, 3 are inserted into the tubular portions 27, 27 and the through holes. Then, the tubular portions 27, 27 can be inserted into the two cutout portions 25, 25.

Further, as shown in FIG. 3, bolt holes 29 are formed at four corners of the pressing plate 23, and screw holes 30 facing the respective bolt holes 29 are formed in the vertical plate 21 (see Fig. 6). After the above-described cylindrical portions 27 and 27 are inserted into the two slit portions 25, the rear wheel support member 26 is sandwiched by the vertical plate 21 and the pressing plate 23, and then the plugs 31 (refer to FIG. 3) through which the respective bolt holes 29 are inserted are respectively screwed. The screw holes 30 are fitted, whereby the pressing plate 23 presses the rear wheel support member 26 toward the vertical plate 21. As a result, the rear wheel support member 26 is sandwiched between the vertical plate 21 and the pressing plate 23, and the joint member 11 is fixed to the rear wheel support member 26.

Further, a tilting shaft support hole 33 (see FIG. 6) for inserting and supporting the tilting shaft 32 (see FIG. 4) of the tilting member 12 is provided in the upper center portion of each of the side plates 20. Further, a central portion of the rear side of each of the side plates 20 is provided through: a step for making a step to be described later The plate arm 61 is supported as a support shaft support hole 35 through which the rotatable support shaft 34 is inserted and supported (refer to FIGS. 3 to 6). Further, as shown in FIG. 4, the cylindrical collars 36, 36 which communicate with the support shaft support holes 35 are fixed to the inner faces of the both side plates 20, and are opposed to each other at a predetermined interval in the left-right direction. The support shaft 34 is supported by the support shaft support hole 35 in a state of being inserted into the two collars 36, 36. Then, as shown in FIG. 6, the upper end portion of the vertical plate 21 is bent in the horizontal direction in the vertical plate 21 to form the flat plate portion 37, and the left and right end portions of the flat plate portion 37 are provided for card insertion. The locking holes 38, 38 at one end of the coil springs 14, 14 are stopped.

The tilting member 12 shown in FIGS. 7 to 9 has a tilting shaft 32 (see FIG. 4) as a tilting center, and is tilted so as to be movable away from the rear wheels 3 and 3 (refer to FIG. 1), and has a base 41. And protruding portions 42 and 42 having a smaller width dimension than the base portion 41 protruding upward from the left and right upper ends of the base portion 41; and extending from the upper end of the base portion 41 toward the joint member 11 side between the pair of protruding portions 42 and 42 Wrist 43. As shown in FIGS. 7 and 8, the base portion 41 and the projecting portions 42, 42 are formed by bending a metal plate material along the outer shape of the rear wheel 3, and the base portion 41 is provided at the lower portion of the base portion 41 from the base portion. The left and right side surfaces of the 41 are cut toward the inner side in the width direction. The lower portion of the base portion 41 covers the rear wheels 3 and 3 from the rear outer side, and prevents the operator's shoe 80 (see FIG. 11) from contacting the rear wheels 3 and 3 to function as the rear wheel cover 41A. When the grip 9 shown in Fig. 1 is rotated about the axis of the rear wheel support member 26, since the rear end of the fork arm 5 can be inserted into each of the cutout portions 44, the rear wheel cover 41A can be prevented from colliding with the fork The rear end of the arm 5. Further, in the vicinity of the central portion of the base portion 41, therethrough A pedal member insertion hole 45 through which the pedal member 15 is inserted is provided. The pedal member insertion hole 45 is formed on the distal end side (the upper side in FIG. 8) of the stepping direction in order to form the distal end side (the lower side in FIG. 8) of the stepping direction of the pedal member 15 as a wide wide portion 46. The segment portion 47 is provided. Further, the wide portion 46 is formed with an inclined surface 47A that is inclined toward the end portion 47 side toward the terminal side in the stepping direction.

Further, on the surface of the joint member 11 on the side of the joint member 11, a leaf spring 13 that is pressed against the rear wheel 3 is fixed as described below (see FIGS. 2 to 5). In each of the protruding portions 42, screw holes 48 and 48 penetrating the protruding portion 42 are arranged in parallel in the width direction of each of the protruding portions 42 (see FIG. 8). Each of the leaf springs 13 is screwed to the screw holes of the leaf springs 13 and screw holes 48, and is fixed to the surface of the joint member 11 side. Further, as shown in FIG. 8, a screw hole 49 is also formed in the base portion 41 at the left and right end portions of the pedal member insertion hole 45. In the present embodiment, as shown in FIGS. 3 to 5, the lower end portion of each leaf spring 13 is bent toward the base portion 41 side, and the bending portion is screwed by the adjusting screw 50 screwed to the screw hole 49. The amount of movement can be adjusted to the side of the joint member 11 (the side of the rear wheel 3). In this way, the braking force of the respective leaf springs 13 to the rear wheels 3 can be adjusted. Further, the leaf spring 13 is an example of the crimping portion of the present invention.

As shown in Fig. 7, the arm portion 43 is formed in a flat plate shape, and a cylindrical member 52 extending in the width direction of the arm portion 43 (the horizontal direction in Fig. 8) is joined to the extended end portion of the arm portion 43 ( Refer to Figure 9). Further, as shown in FIGS. 7 and 8, on the left and right sides of the wrist portion 43, toward both sides A locking piece 53 that is provided at the other end of the locking coil spring 14 (see FIG. 2) is protruded from the outer side. As shown in Fig. 10, the tilting shaft 32 inserted through the tubular member 52 is supported by the tilting shaft support holes 33 of the side plates 20, 20, which are normally shown as shown by the two dotted lines in Fig. 10. The two coil springs 14, 14 (see FIG. 2) are locked to the respective locking holes 38 (see FIG. 6) of the vertical plate 21 and the respective locking pieces 53, and the leaf springs 13 of the tilting member 12 are oriented. The pressure is released away from the direction of each of the rear wheels 3. Further, each coil spring 14 is an example of the biasing means of the present invention.

As shown in FIGS. 7 and 8, a plate-shaped screw-threading member 54 is erected and fixed to the upper surface of the arm portion 43 in the vicinity of the center in the extending direction of the arm portion 43. The screw threading member 54 is provided with a screw hole 55 and extends toward the vertical plate 21 (see FIGS. 2 and 10) of the joint member 11. The screw hole 55 shown in FIG. 2 and FIG. 10 can be screwed into the screw hole 55, and the screw 56 is rotated to advance toward the vertical plate 21, so that the front end portion of the screw 56 can be oriented from the screw-fitting member 54. The vertical plate 21 protrudes sideways. As shown by the two dotted lines in Fig. 10, in the normal state, the front end of the screw 56 is pressed against the vertical plate 21 by the elastic pressure of each coil spring 14. Thereby, the tilting of the tilting member 12 with the tilting shaft 32 as the tilting center in the direction away from the respective rear wheels 3 is prevented. In the present embodiment, when the operation screw 56 is rotated to move toward the vertical plate 21 side or to retreat from the vertical plate 21, and the amount of protrusion of the front end portion of the screw 56 to the screw screwing member 54 is changed, the screw 56 is changed. The tilting angle of the tilting member 12 to the vertical plate 21 when the front end presses the vertical plate 21. Therefore, the leaf springs of the tilting member 12 in the normal state can be changed in response to the change in the amount of protrusion of the tip end portion. The interval between 13 and the outer peripheral surface of each of the rear wheels 3. Further, as shown in FIG. 7, a locking opening 57 for locking the pedal arm 61 to be described later is provided on the proximal end side of the wrist portion 43. Further, the screw-fitting member 54 is an example of a fixing member of the present invention, and the screw 56 is an example of a screw member for preventing the tilting member from tilting. Further, the screw screwing member 54 and the screw 56 are examples of the interval adjusting means of the present invention.

Further, the pedal member 15 is operable to press the leaf springs 13 of the tilting member 12 to the respective rear wheels 3 as shown by solid lines in FIG. 10, and as shown in FIGS. 3 to 5, The pedal arm 61, the pedal arm support bracket 62, the annular member mounting member 63, and the screw shaft 64. The pedal arm 61 is constituted by a plate-like member that extends in the front-rear direction and has a step portion 67 at the rear end. As shown in FIG. 2, the pedal arm 61 protrudes outward from the inner side of the tilting member 12 by the pedal member insertion hole 45 of the tilting member 12, and the step portion 67 is disposed outside the tilting member 12. As shown in FIG. 3, a support shaft insertion hole 68 and a connection shaft insertion hole 69 are arranged side by side in the front-rear direction of the pedal arm 61 at the front end portion of the pedal arm 61. The front end portion of the pedal arm 61 is disposed between the collars 36 and 36 (see FIG. 4), and is supported by the support shaft insertion hole 68 provided at the front end portion, and is inserted into the support shaft as shown in FIG. The support shaft 34 of the support hole 35. As a result, the pedal arm 61 is supported by the support shaft 34 that is inserted and supported by the support shaft insertion hole 68 so as to be movable in the left-right direction between the collars 36 and 36.

The pedal arm support bracket 62 is formed by continuously providing screw holes in the upper portions of the pair of right and left plate members 70 and 70 (see FIGS. 3 and 5). The device 71 (see Fig. 5) is configured. The screw hole forming member 71 is formed with a screw hole extending in the vertical direction. Further, a connecting shaft support hole 72 that communicates with the connecting shaft insertion hole 69 of the pedal arm 61 is formed in each of the plate members 70. In the present embodiment, the pedal arm 61 is coupled to the pedal arm support bracket 62 by supporting the coupling shaft 74 (see FIG. 10) inserted into the coupling shaft insertion hole 69 in the two coupling shaft support holes 72. .

The annular member mounting member 63 is disposed on the upper surface of the arm portion 43 across the locking opening 57 (see FIG. 7) as shown in FIG. 2 . The annular member mounting member 63 extends in the width direction of the arm portion 43 and is provided with a metal solid body having a small diameter portion 77 (see FIG. 4) at both end portions of the large diameter portion 76 (see FIG. 4). . Each of the small diameter portions 77 is provided with a resin-made annular member 78, and the outer peripheral surface and the outer peripheral surface of the large-diameter portion 76 are continuous. A screw shaft insertion hole that extends in a direction orthogonal to the axial direction of the large diameter portion is formed in the large diameter portion 76.

The screw shaft 64 is a shaft body on which a thread is formed on the outer surface. As shown in FIG. 4, the screw shaft 64 is inserted into the screw insertion hole of the annular member mounting member 63, and the front end side is protruded from the annular member mounting member 63 toward the pedal member 15 side. In this state, the screw shaft 64 is inserted into the locking opening 57. Then, the distal end side of the screw shaft 64 is screwed to the screw hole of the screw hole forming member 71 (see FIG. 5) provided in the pedal arm support bracket 62. In this manner, the screw shaft 64 is disposed to extend toward the stepping direction of the tread portion 67 (the direction in the lower direction of FIGS. 10 and 11). The pedal arm 61 is engaged with the locking opening of the arm portion 43 of the tilting member 12 through the annular member mounting member 63 (annular member 78) through which the screw shaft 64 is inserted. 57. As shown in FIG. 2 to FIG. 5, the screw shaft 64 is screwed with a nut member 65. The nut member 65 constitutes a positioning nut that is movable in the stepping direction along the screw shaft 64 by a rotation operation. In the present embodiment, when the nut member 65 is rotated and moved in the stepping direction, the pedal arm support bracket 62 is moved in the stepping direction (vertical direction in FIG. 10) in conjunction with this. Therefore, the pedal arm 61 coupled to the pedal arm support bracket 62 can be advanced and retracted toward the wrist portion 43 in the stepping direction. Further, reference numeral 79 in Fig. 5 is a lock nut for positioning the screw shaft 64.

Next, the operation of the brake device 10 will be described. As shown by the two-dotted line in FIG. 10, when the brake device 10 is in the non-operating state, the two coil springs 14, 14 (refer to FIG. 2) face the leaf springs 13, 13 of the tilting member 12 away from the rear wheel 3, The direction of 3 is pressed. In this state, the rear wheels 3 are not braked by the leaf springs 13 and are braked, so that the operator can move the manual carriage 1 by pushing and pulling the grip 9 (refer to FIG. 1).

On the other hand, when the brake device 10 is brought into an operating state, the operator performs the operation described below. The pedal arm 61 shown in FIG. 10 is inserted into the locking opening 57 of the tilting member 12 (see FIG. 7) through the annular member mounting member 63 (annular member 78), and the operator makes the pedal arm 61 reach. The wide portion 46 (see FIG. 8) resists the elastic pressure of the coil springs 14, 14 to step the tread portion 67 downward, and the pedal arm 61 is rotated downward on the support shaft 34 about the axis of the support shaft 34. move. At this time, the annular member mounting member 63 (annular member 78) presses the arm portion 43 of the tilting member 12 downward so that the tilting member 12 has the tilting shaft 32 as the tilting center toward the rear wheels 3, 3. The direction is tilted. its As a result, as shown by the solid line in FIG. 10 and FIG. 11, each leaf spring 13 is pressed against the outer peripheral surface of the rear wheel 3 to brake the rear wheel 3. In the present embodiment, when the pedal arm 61 reaches the wide portion 46, the pedal arm 61 is induced to the side of the segment portion 47 by the inclined surface 47A. As a result, even if the operator's foot is separated from the step portion 67, the pedal arm 61 is caught in the segment portion 47 and is not pulled back by the elastic force of the coil springs 14, 14. Therefore, even when the worker's foot is separated from the step portion 67, the state in which the leaf spring 13 is pressed against the outer circumferential surface of each of the rear wheels 3 can be maintained, and the operating state of the brake device 10 can be maintained.

On the other hand, when the brake device 10 is changed from the operating state to the non-operating state, the operator uses the foot to move the pedal arm 61 in the wide portion 46 toward the side opposite to the segment portion 47 (the left direction in FIG. 8). The pedal arm 61 is stuck in the state of the segment portion 47. Thereafter, when the foot is separated from the pedal arm 61, the tilting member 12 is tilted toward the tilting center 32 by the biasing force of the coil springs 14, 14 and tilted toward the front end of the screw 56 in the direction away from the rear wheels 3, 3. Abuts to the vertical plate 21. As a result, as shown by the two-dotted line in FIG. 10, the leaf springs 13 of the tilting member 12 can be moved away from the respective rear wheels 3, and the braking of the rear wheels 3, 3 can be released. When the tilting member 12 is tilted in the direction away from the rear wheels 3, 3, the arm portion 43 pushes the annular member mounting member 63 (annular member 78) upward, and the pedal arm 61 is attached to the support shaft 34. The axis of the support shaft 34 is rotated to rotate upward.

Further, in the brake device 10, when the protruding amount of the screw-flanging member 54 is changed at the tip end portion of the screw 56, the inclination of the tilting member 12 to the vertical plate 21 when the front end of the screw 56 is pressed against the vertical plate 21 can be changed. angle. Therefore, the interval between the leaf springs 13 of the tilting member 12 and the outer peripheral surfaces of the respective rear wheels 3 in the normal state can be changed in accordance with the change in the amount of protrusion of the tip end portion. In this case, it is assumed that the rear wheels 3 are worn out to cause the outer dimensions of the rear wheels 3 to be small, or the rear wheels 3 are exchanged for different outer dimensions, so that the leaf springs 13 can be crimped to For each of the rear wheels 3, the adjustment of the tilting member 12 (the leaf spring 13) to the rear wheel 3 can be easily performed. When the leaf springs 13, 13 are changed from the outer circumferential surfaces of the rear wheels 3, 3, the adjustment step portion 67 is formed in order to reliably press the leaf springs 13, 13 against the outer circumferential surfaces of the rear wheels 3, 3. The need to step on the amount. In the present embodiment, when the nut member 65 is rotated along the screw shaft 64 and moved toward the stepping direction of the step portion 67, the pedal arm 61 can advance and retreat toward the wrist portion 43 in the stepping direction (up and down direction). Therefore, the arrangement position of the pedal arm 61 in the stepping direction can be changed. Thereby, with the rotation operation of the nut member 65, the arrangement position of the pedal arm 61 can be arbitrarily changed in the stepping direction in accordance with the amount of depression of the step portion 67. In this manner, even when the gap between the leaf springs 13 and 13 and the outer peripheral surfaces of the rear wheels 3 and 3 is changed, the leaf springs 13 and 13 can be crimped to the rear wheel 3 by arbitrarily setting the above-described depression amount. , the outer circumference of 3. Further, the screw shaft 64 and the nut member 65 are examples of the pedaling amount adjusting means of the present invention.

Further, when the pallet truck 1 performs the pallet transporting operation, as shown by the two-dotted line in FIG. 11, the operator's shoe 80 accidentally hits the outer lower end of the rear wheel cover 41A, and there is a rearward The wheel cover 41A applies an external force. When the rear wheel cover 41A is pressed toward the direction toward each of the rear wheels 3 by the external force, the tilting member 12 tilts with the tilting shaft 32. The center is tilted toward the direction of each of the rear wheels 3. As in the case described above, each of the leaf springs 13 will approach each of the rear wheels 3, and when the leaf springs 13 are crimped to the rear wheels 3, the rear wheels 3, 3 can be braked. At this time, as in the present embodiment, the distance L1 between the center of the tilt shaft 32 and the lower end of the rear wheel cover 41A (see FIG. 11) is set to be larger than the center and each of the leaf springs 13 and the rear wheels. When the distance L2 (refer to FIG. 10) between the crimping portions of 3 is larger, the force acting on each of the crimping portions can be made larger than the external force in response to the ratio of the distances L1 and L2. Thereby, even when a small external force is applied to the lower end of the rear wheel cover 41A, the pressure contact portion can apply a force larger than the external force to each of the rear wheels 3. Further, the upper end side of the base portion 41 to which the tubular member 52 inserted with the tilt shaft 32 is joined is an example of the end side of the tilting member of the present invention, and the lower end of the rear wheel cover 41A is the tilting member of the present invention. An example of the end side.

<Effects of this embodiment>

In order to operate the brake device 10 in the brake device 10 of the manual pallet truck 1 of the present invention, the operator can step on the step portion 67 of the pedal arm 61 downward against the elastic pressure of the coil springs 14, 14 so that the operator steps down. Each of the leaf springs 13 is pressed against the outer peripheral surface of each of the rear wheels 3 to brake the rear wheels 3, 3. Further, in order to move the brake device 10 from the operating state to the non-operating state, the coil springs 14, 14 bias the leaf springs 13, 13 in a direction away from the rear wheels 3, 3, and can be released. Braking of the rear wheels 3, 3. Therefore, the operation of the brake device 10 in the operating state or the non-operating state is simplified, so that the operability of the brake device 10 can be improved.

Further, the interval between the leaf springs 13, 13 of the tilting member 12 and the outer peripheral surface of the rear wheels 3, 3 in the normal state can be arbitrarily set, so that even if, for example, the rear wheels 3 are worn, the outer dimensions of the rear wheel 3 are changed. In a small case, in order to allow the leaf springs 13, 13 to be crimped to the rear wheels 3, 3, the adjustment of the leaf springs 13, 13 to the rear wheels 3, 3 can be easily performed. Further, even when the gap between the leaf springs 13 and 13 and the outer peripheral surfaces of the rear wheels 3 and 3 is changed, by arbitrarily setting the amount of depression of the step portion 67, the leaf springs 13 and 13 can be surely crimped to The operation of the rear wheels 3, 3 is possible. Thereby, the braking performance of the brake device 10 can be well maintained.

Further, in order to change the interval between the leaf springs 13 and 13 of the tilting member 12 and the outer peripheral surfaces of the rear wheels 3 and 3 in the normal state, the inclination angle of the vertical plate 21 of the joint member 11 of the tilting member 12 is changed. It suffices to perform a simple operation of changing the amount of protrusion of the front end portion of the screw member 56 to the screw-threading member 54 of the tilting member 12.

Further, in order to change the amount of depression of the tread portion 67, the pedal arm 61 can advance and retract the arm portion 43 of the tilting member 12 in the vertical direction, and the nut member 65 is rotated to move in the vertical direction along the screw shaft 64. Simple operation is enough.

Further, for example, in the operation of transporting the pallet by the manual pallet truck 1, the operator's shoe 80 inadvertently hits the outer lower end of the rear wheel cover 41A, and at the outer lower end, the rear wheel cover 41A is applied. In the case of an external force approaching the direction of the rear wheels 3, 3, the leaf springs 13, 13 will crimp the rear wheels 3, 3 and brake the rear wheels 3, 3. At this time, according to the ratio of the distance L1 (refer to FIG. 11) and the distance L2 (refer to FIG. 10), each leaf spring 13 can be The force acting on the pressure contact portion with each of the rear wheels 3 is set to be larger than the aforementioned external force. Thereby, even when a small external force is applied to the lower end of the rear wheel cover 41A, the pressure contact portion can apply a larger force to the rear wheels 3, 3 than the external force, so that the braking force of the brake device 10 can be improved.

The present invention is not limited to the above-described embodiments, and a part of the structure can be appropriately modified without departing from the gist of the invention. In the above embodiment, the example in which the leaf spring 13 crimped to the rear wheel 3 is fixed to each of the protruding portions 42 of the tilting member 12 is exemplified, but instead of fixing the rubber member crimped to the rear wheel 3 to each Projection 42. Further, in addition to this, on the surface of the tilting member 12, protrusions for pressing the respective rear wheels 3 may be arranged in the circumferential direction of each of the rear wheels 3, and the rear wheels 3 may be braked by the projections.

3‧‧‧ Rear wheel

10‧‧‧ brakes

12‧‧‧ tilting members

13‧‧‧ leaf spring

14‧‧‧ coil spring

15‧‧‧ pedal member

20‧‧‧ side panels

21‧‧‧ vertical board

23‧‧‧ Press plate

25‧‧‧cutting section

26‧‧‧ Rear wheel support members

27‧‧‧Cylinder

31‧‧‧ bolt

32‧‧‧ tilting axis

33‧‧‧Tip shaft support hole

34‧‧‧Support shaft

35‧‧‧Support shaft support hole

43‧‧‧ wrist

54‧‧‧ Screw-screw components

56‧‧‧ screws

61‧‧‧ pedal arm

62‧‧‧ pedal arm support bracket

63‧‧‧A member for mounting a ring member

64‧‧‧ screw shaft

65‧‧‧ Nut components

67‧‧‧Steps

70‧‧‧ board components

71‧‧‧ Screw hole forming member

72‧‧‧Connecting shaft support hole

74‧‧‧Connected shaft

78‧‧‧Annual members

L2‧‧‧Distance between the center of the tilting shaft and the sum of the leaf springs and the crimping parts of the rear wheels

Claims (6)

A brake device for a manual pallet truck, which is mounted on a manual pallet truck and brakes the aforementioned wheel, the manual pallet truck having: a body portion for connecting a plurality of fork arms to be lifted and lowered, and a lower portion of the body portion The traveling wheel includes: a tilting member supported by the body portion so as to be tiltable toward the wheel; and a crimping portion provided on the tilting member and capable of crimping the wheel; and a biasing means, Arranging between the main body portion and the tilting member, and biasing the tilting member in a direction away from the wheel in a normal state; and a pedal member that is locked to the tilting member by resisting the elastic pressure of the biasing means And stepping on, the crimping portion is crimped to the aforementioned wheel. The brake device for a manual pallet truck according to claim 1, further comprising: an interval adjusting means for adjusting a distance between the wheel and the crimping portion by changing an inclination angle of the tilting member to the main body portion; The stepping amount adjusting means for adjusting the amount of depression of the pedal portion by moving the pedal member forward and backward in the stepping direction of the pedal member. The brake device for a manual pallet truck according to claim 2, wherein the interval adjusting means has a fixing member fixed to the tilting member and having a screw hole extending toward the body side; and a screw member. a front end portion thereof may protrude from the fixing member toward the body side The screw hole is closed, and the tip end portion abuts against the main body portion to prevent the tilting of the tilting member, and the screw member is moved forward and backward with respect to the main body portion to change the amount of protrusion of the front end portion to the fixing member. The aforementioned tilt angle can be changed. The brake device for a manual pallet truck according to claim 2 or 3, wherein the stepping amount adjusting means has a screw shaft that is screwed to the pedal member and is locked to the tilting member and faces the stepping direction And a nut member that is screwed to the screw shaft in the stepping direction, and the pedal member is movable toward the stepping direction along the screw shaft, so that the pedal member is made to the tilting member advance and retreat. The brake device for a manual pallet truck according to any one of claims 1 to 3, wherein the tilting member supports the one end side of the tilting member as a tilting fulcrum and is tilted by the main body portion. The distance between the fulcrum and the other end side of the tilting member is set to be larger than the distance between the tilting fulcrum and the crimping portion. The brake device of the manual pallet truck according to claim 4, wherein the tilting member supports the one end side of the tilting member as a tilting fulcrum and is supported by the main body portion, and the tilting fulcrum and the tilting member are The distance between his end faces is set to be larger than the distance between the aforementioned tilting fulcrum and the aforementioned crimping portion.