JP2006306119A - Braking mechanism of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a braking mechanism for a vehicle such as a dolly capable of preventing a wire used therein from severing. <P>SOLUTION: The braking mechanism is structured so that a pair of brake shoes 31 rotatable and able to abut to the front and rear of a fixed rear wheel are installed on a base table mounted on a plate etc. and wire pins 41a and 41b are mounted at the ends of the brake shoes, followed by coupling with a wire 40 covered with a wire guide in the condition that a spring 20 is inserted between these wire pins 41a and 41b, and that a resilient piece 200 is inserted between the wire pin 41a and the end of the wire guide 201. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a brake mechanism for a vehicle such as a carriage or a wheelchair.

Conventionally, for example, Japanese Patent Application Laid-Open No. 2004-286206 discloses a brake mechanism in a cart for carrying a load.
The brake mechanism disclosed in this publication uses a spring to cause a C-shaped brake shoe to bite into a wheel and apply the brake, and the brake is always applied.
Therefore, when the carriage is moved, the brake must be released, but the lever is operated and the wire is pulled to release the brake shoe from the wheel.

JP 2004-286206 A

In the brake mechanism disclosed above, the brake shoe often bites into the wheel and the brake is applied. However, when releasing the brake, the lever is operated, but since the brake shoe does not come off the wheel, the wire is further pulled. Then, since the length of the wire guide is constant, a tensile force further acts on the wire, and the wire is broken or the lever is broken.
Therefore, the present invention provides a brake mechanism that eliminates such inconvenience.

As shown in FIG. 3, the brake mechanism according to claim 1 is a pair of brake shoes (31) capable of rotating on a base attached to a base plate or the like and capable of abutting on the front and rear of the wheel after being fixed. And wire pins (41a, 41b) are attached to the ends of the pair of brake shoes (31).
And it connects with the wire (40) covered with the wire guide (201) in the state which penetrated the spring (20) between these wire pins (41a, 41b). An elastic body (200) is inserted between the wire pin (41a) and the end of the wire guide (201).

  In the brake mechanism, the brake shoe (31) bites into the locked state due to the elastic force of the spring (20). On the other hand, when the wire (40) is pulled, the brake shoe (31) rotates via the wire pins (41a, 41b), and is released from the wheel to release the brake. Here, when the brake shoe (31) bites into the wheel and does not rotate, if the wire (40) is pulled, the elastic body (200) is contracted, so that the wire is prevented from being pulled with more force. The breakage of the wire can be avoided and the breakage of the lever can be prevented.

  The brake mechanism according to claim 2 is a spring that can be rotated on a base attached to a base plate or the like, and can always come into contact with the rear wheel side before and after the fixed rear wheel. 20a, 20b) and wire pins (41a, 41b) are attached to the ends of the pair of brake shoes (31). The wire 40 fixed at the tip end with the wire stopper 45 is inserted through the wire hole 42b formed in the front wire pin 41b and the wire hole 42a formed in the rear wire pin 41a, and the rear wire pin (41a) and the wire (40 The elastic body (200) is inserted between the ends of the wire guide (201) that covers the upper surface of the wire guide.

  In the brake mechanism, the brake shoe (31) bites into the wheel and is locked by the elastic force of the springs (20a, 20b). On the other hand, when the wire (40) is pulled, the brake shoe (31) rotates via the wire pins (41a, 41b), and is released from the wheel to release the brake. Here, when the brake shoe (31) bites into the wheel and does not rotate, if the wire (40) is pulled, the elastic body (200) is contracted, so that the wire is prevented from being pulled with more force. The breakage of the wire can be avoided and the breakage of the lever can be prevented.

  Since the brake mechanism of the present invention avoids excessive pulling of the wire when the brake shoe bites into the wheel and does not rotate, it can avoid breakage of the wire and can prevent breakage of the lever.

(First embodiment)
Embodiment Modes of the present invention will be described with reference to FIG. 1A illustrating a plan view and FIG. 1B illustrating a right side surface.
The main body 1 of the carriage is formed in a square shape with frame frames combined at an appropriate interval, and a base plate 1a made of thin steel plate or resin is fixed on the frame frame.
A pair of front wheels 3a are attached to the back side of the base plate 1a through a free caster 2, and a fixed rear wheel 3b is attached to the back side of the back of the base plate 1a. is there.
A turnable reverse U-shaped handle 19 is attached to the frame frame behind the base plate 1a so that it can be folded.

Next, with respect to the brake mechanism 100 of the fixed rear wheel 3b, refer to FIG. 2 (A) showing the front, FIG. 2 (B) showing the side, and FIG. 3 (A) showing the brake mechanism viewed from the back side. I will explain.
The mounting structure of the rear wheel 3b is a well-known structure. The rear wheel 3b is rotatably mounted on an inverted U-shaped mounting bracket, and the mounting bracket is screwed to the back side of the base plate 1a. .

The components of the brake mechanism 100 are an attachment main body 10, a spring 20, a brake shoe 30, a wire 40, and a lock / unlock mechanism 50. The brake mechanism is arranged before and after the rear wheel 3b via a base plate 1a, a frame, and the like. As a result, the shoe main body 31 of the brake shoe 30 comes into contact with the front and rear of the rear wheel 3b to exert a braking function against forward and backward movement.
The mounting body 10 will be described with reference to FIG. 4 (A) showing the left side and FIG. 4 (B) showing the plane. The base 10a is a rectangular thin plate. A bolt hole 11a for fixing with a bolt 11 is formed on the back side of the plate 1a, and a U-shaped fixing is formed in the center with a pin hole 12c through which the fixing pin 12 shown in FIG. 4 (C) is inserted. A body 13 is erected.

Next, the brake shoe 30 will be described with reference to FIG. 4 (E) showing the left side and FIG. 4 (F) showing the plane. The shoe main body 31 is a thin plate rectangle. An extension body 33 having a pin hole 32 that can be attached to the base 10 a via the fixing pin 12 is integrally formed. The extension body 33 can be attached to the outside of the fixing body 13.
Further, a pin hole 35 to which a wire pin 41 connected to the wire 40 can be attached is formed in the lower portion of the shoe main body 31. The wire pin 41 is provided with a wire hole 42 through which the wire 40 is inserted at the center as shown in FIG. 4 (D).

The brake mechanism 100 configured as described above attaches the brake shoes 30, 30 to the base 10 a via the fixing pins 12, 12. Next, the wire pins 41 a and 41 b are inserted into the shoe bodies 31 and 31 of the brake shoes 30 and 30.
Then, the wire 40 is inserted into the wire hole 42 formed in the rear wire pin 41 a of the rear brake mechanism, and the spring 20 is passed through the wire 40.
Further, the wire 40 is inserted into a wire hole 42 formed in the front wire pin 41 b of the front brake mechanism, and the tip end portion of the wire 40 is fixed by a wire stopper 45.
The wire 40 is covered with a wire guide 201, and the wire 40 is movable in the wire guide 201 having rigidity. Further, an elastic body (coil spring) 200 is inserted between the rear wire pin 41 a of the rear brake mechanism and the end of the wire guide 201. The wire guide 201 that is in contact with the elastic body (coil spring) 200 covers the wire 40 up to the end of the operation piece 53 described later. Note that the wire guide 201 having rigidity does not need to be metal, and is not crushed when pressed with synthetic resin or the like, and returns to its original state even when crushed.

  Next, when the pair of brake mechanisms 100 are fixed to the back surface side of the base plate 1a with the bolts 11, the pair of shoe bodies 31, 31 are brought into contact with each other before and after the rear wheel 3b by the repulsive force of the spring 20. Become locked. That is, the rotatable shoe bodies 31 and 31 can be rotated by the fixing pin 12 attached to the lower portion, and are attached between the rear wire pin 41a and the front wire pin 41b provided at the upper position of the fixing pin 12. The repulsive force of the spring 20 causes the shoe main bodies 31 to be biased to the opposite sides to form a C shape, and is brought into contact with the front and rear of the rear wheel 3b and locked (FIG. 2). (B)).

It should be noted that the position (angle) at which the shoe body 31 contacts the rear wheel 3b is important, and it goes without saying that the position (angle) at which the shoe body 31 bites in when moving forward and backward is desirable. Moreover, in order to lock more reliably, it is desirable to attach a brake mechanism to both rear wheels 3b.
In consideration of wear of the shoe body 31, an extension piece 39 is attached to the shoe body 31. The extension piece 39 has a long hole, and the shoe body 31 can be adjusted with a bolt 39a after the length is adjusted, thereby adjusting the brake condition.

The end of the wire 40 is connected to a lock / unlock mechanism 50 attached to the grip bar 19 a of the handle 19.
The lock / unlock mechanism 50 will be described with reference to FIG. 5 (a plan view and a side cross-sectional view). The lock / unlock mechanism 50 has a circular portion 51 that matches the shape of the gripping bar 19 a via a screw 52. Fixed. Further, the lock / unlock mechanism 50 has a S-shaped operation piece 53 that can be rotated on the screw 52, and is rotated on the operation piece 53 via a fixed operation lever 54.
Further, a wire 40 connected to a brake mechanism attached to the pair of rear wheels 3b is fixed to an end portion of the operation piece 53 via a bolt and nut 55. The elastic body (coil spring) 200 supported by the guide 201 contracts, and the wire 40 is pulled.

As shown in FIG. 3A, the shoe main bodies 31, 31 of the brake mechanism 100 are in contact with the rear wheel 3b by the repulsive force of the spring 20 and are in a locked state. However, when the operation lever 54 is rotated to pull the wire 40, the front wire pin 41b is pulled to the operation lever 54 side, and the front shoe body 31 is rotated by the fixing pin 12 to be separated from the rear wheel 3b.
Since one shoe body 31 is rotated by the fixing pin 12 by the repulsive force of the spring 20, the C-shaped shoe bodies 31, 31 in the locked state have a further expanded C shape. Then, the contact state disappears before and after the rear wheel 3b, and the unlocked state is established (FIG. 3B).
As described above, the simple brake mechanism is always in the locked state, but can be unlocked by the operation lever 54, so that safety can be ensured even when the carriage is stopped on an inclined road or the like. Can do.

However, if the shoe main bodies 31 and 31 bite into the rear wheel 3b, the shoe main bodies 31 and 31 cannot rotate even if the wire 40 is pulled to bring the operation lever 54 into the unlocked state. Therefore, when the operation lever 54 is further turned, if the elastic body 200 is not provided, the wire guide 201 having rigidity and a constant length is in contact with the rear wire pin 41a. The wire 40 acting with a force shorter than that is broken or the lever mechanism is broken.
However, in order to prevent the wire 40 from being broken, an elastic body (coil spring) 200 is inserted between the rear wire pin 41 a of the rear brake mechanism and the end of the wire guide 201.
That is, even if the wire 40 is pulled, the length adjustment with respect to the wire guide 201 having a certain length can be absorbed by the elastic body (coil spring) 200 being contracted, and the wire 40 can be prevented from being pulled further. 40 breakage or damage to the operation lever 54 can be prevented.

More specifically, the length of the wire guide 200 from the end of the operation piece 53 to the elastic body 200 is L1, the length of the elastic body 200 is L2, the amount of contraction is Δ, and the end of the operation piece 53 is described in detail. And the length from the wire stopper 45 to L3.
When the wire 40 (length L3) is pulled with a lever, the compression force is not applied to the elastic body (coil spring) 200 at first. However, after that, a compressive force is applied to the elastic body 200, and the elastic body 200 compresses until the length of the wire guide 201 from the end of the operation piece 53 to the elastic body 200 reaches (L3-Δ). The wire 40 is not pulled too much. Therefore, breakage of the wire 40 or damage to the operation lever 54 can be prevented. Note that it is unclear whether the shoe main body 31 is rotated by this operation and is separated from the rear wheel 3b.
The brake mechanism is attached to the wheel 3b after being fixed, but may be attached to a rotatable wheel.

(Second Embodiment)
Next, another configuration shown in FIG. 6 ((A) is a side view in a locked state, (B) is a side view in an unlocked state, (C) is a front view, and (D) is a detailed view of a brake shoe 71). The brake mechanism will be described.
An inclined base 70 and a brake base 72 are attached to the back side of the base plate 1a through a fixed body 69 fixed to the base plate 1a so as to be rotatable by a rotary shaft 70a. The brake base 72 is provided with a brake shoe 71 having a shape that can be brought into contact with both shoulder portions of the rear wheel 3b and that can be brought into contact (biting in) at two points on both ends.
The base 70 is provided with an adjusting bolt 75 for inserting a spring 73. Depending on the position of the adjusting bolt 75, the reaction force of the spring 73 acts on the brake base 72, and the brake shoe 71 is moved backward. The pressing force for pressing the wheel 3b can be adjusted.
The brake base 72 has an end portion of a wire 40 attached thereto, and the other end portion of the wire 40 is connected to the lock / unlock mechanism 50.

In the brake mechanism having the above-described configuration, the brake shoe 71 normally presses the rear wheel 3b by the repulsive force of the spring 73, and is in a locked state (FIG. 6A).
On the other hand, when the wire 40 is pulled via the lock / unlock mechanism 50, the brake base 72 is rotated by the rotation shaft 70a, and the brake shoe 71 is separated from the rear wheel 3b to be unlocked (see FIG. 6 (B)).
Thus, although it is always locked by a simple brake mechanism, it can be unlocked by pulling the wire 40, so safety can be ensured even if the carriage is stopped on an inclined road or the like. Can be planned.

When the end of the wire 40 is attached to the base 70 and the wire 40 is pulled, the base 70 hits the adjustment bolt 75 and the brake base 72 (brake shoe 71) is unlocked from the rear wheel 3b. You may comprise in a state.
Moreover, although the said brake machine mechanism is a structure which becomes an unlocked and locked state via a wire, you may comprise with a link mechanism etc. in addition.

(Third embodiment)
FIG. 7 shows a brake mechanism having another configuration. The brake mechanism shown in the first embodiment (FIG. 3) uses a single spring 20, and the spring 20 is always used. Unlike the repulsive state, the pair of brake shoes 30a and 30b are independently provided with springs 20a and 20b, and these springs 20a and 20b are always used in a tensioned state.
FIG. 7A is a lock state diagram of the brake mechanism viewed from the back side, and FIG. 7B is a side view of the lock state.

The end of the spring 20a is attached to the rear wire pin 41a of the rear brake mechanism, and the other end is attached to the base 10a. In addition, a brake piece 31c having a long hole 38 formed in the bottom plate of the shoe main bodies 31a and 31b is fixed at an appropriate position with a screw (not shown) through the long hole 38. The protrusion length of 31c can be adjusted, and it is possible to cope with the wear of the wheel 3b after fixing (FIG. 8C).
Therefore, the spring 20a causes a clockwise turning moment on the shoe body 31a with the fixing pin 12a as a base, and the brake piece 31c attached to the shoe body 31a is in contact with the rear wheel 3b and is in a locked state. .
On the other hand, the other end of the spring 20b is similarly attached to the front wire pin 41b of the front brake mechanism, and the other end is attached to the base 10a. For this reason, the shoe body 31b generates a counterclockwise turning moment with the fixed pin 12b as a base shaft, and the brake piece 31c attached to the shoe body 31b is in contact with the rear wheel 3b and is in a locked state.

Further, as shown in FIGS. 8A (plan view) and (B) (side view), the wire 40 is inserted into the wire hole 42b formed in the front wire pin 41b, and the inside of the metal cylinder 44 is inserted. The tip of the wire 40 is fixed by a wire stopper 45 through the wire. The cylindrical body 44 is used for fixing the end of the wire 40 and is not necessarily required.
On the other hand, the wire 40 inserted through the wire hole 42b passes through the wire hole 42a formed in the rear wire pin 41a, and can move within the wire guide 201 having rigidity, as in the first embodiment. is there. Further, an elastic body (coil spring) 200 is inserted between the rear wire pin 41 a of the rear brake mechanism and the end of the wire guide 201. The wire guide 201 that is in contact with the elastic body (coil spring) 200 covers the wire 40 up to the end of the operation piece 53 described later. Note that the wire guide 201 having the rigidity does not need to be a metal, and does not crush even when pressed with a synthetic resin or the like, and has a hardness enough to return to its original state even when crushed.

In the brake mechanism of the third embodiment, the brake pieces 31c of the shoe bodies 31a and 31b of the brake mechanism 100 are in contact with the rear wheel 3b by the pulling force of the springs 20a and 20b, and are locked.
Therefore, when the operation lever 54 is rotated to pull the wire 40, the shoe body 31b is pressed by the cylindrical body 44, and a clockwise rotating moment is generated with the fixing pin 12b as a base axis, and is detached from the rear wheel 3b. To unlock.

  On the other hand, the position of the wire hole 42b is changed by the clockwise rotation of the shoe body 31b, and the length of the wire 40 between the wire hole 42a and the wire hole 42b is substantially constant. When pressed by an elastic body (coil spring) 200 supported by the guide 201, a counterclockwise turning moment is generated with the fixing pin 12a as a base, and the shoe body 31a is detached from the rear wheel 3b and is in an unlocked state. Become.

As described above, the shoe main bodies 31a and 31b are normally locked through the pulling force of the springs 20a and 20b. However, the wire 40 is fixed by the cylindrical body 44 and is supported by the wire guide 201. By providing the body (coil spring) 200, the single straight wire 40 can be pulled to be in an unlocked state.
In the above description, the wire 40 is described as being pulled toward the shoe main body 31a. However, the wire 40 may be pulled toward the shoe main body 31b.
In addition, the cylindrical body 44 and the metal terminal 56 are not provided, and a single straight wire 40 is provided with a wire stopper 45 on the wire hole 42a side, inserted into the wire hole 42b from the wire hole 42a, and rotated through the wire hole 42b. Then, it may be configured by pulling again toward the wire hole 42a.

However, also in the third embodiment, as in the first embodiment, when the shoe main body 31, 31 bites into the rear wheel 3b, the wire 40 is set to be unlocked by the operation lever 54. Even when pulled, the shoe bodies 31, 31 cannot rotate.
Therefore, when the operation lever 54 is further rotated, if there is no elastic body (coil spring) 200, the wire guide 201 having rigidity and constant length is in contact with the rear wire pin 41a. The wire 40 acting with a force shorter than the length of 201 is broken.
However, in order to prevent the wire 40 from being broken, an elastic body (coil spring) 200 is inserted between the rear wire pin 41 a of the rear brake mechanism and the end of the wire guide 201.
That is, even when the wire 40 is pulled, the length adjustment relative to the wire guide 201 having a certain length can be absorbed by the elastic body (coil spring) 200 being contracted, and the wire 40 can be prevented from being pulled further. Therefore, breakage of the wire 40 or damage to the operation lever 54 can be prevented.

In the above embodiment, only the brake mechanism is illustrated and applied to a carriage, but it can be used for a wheelchair or the like. Further, in each embodiment, whether the brake state is always set or the brake released state may be configured by selecting the various brake mechanisms described above, and the structure in each embodiment is appropriately selected. A brake mechanism may be configured in combination.
The elastic body 200 may be rubber or the like in addition to the coil spring.

(A) is a top view of a trolley | bogie, (B) is a right side surface. (A) is a front view of a brake mechanism, (B) is a side view. (A) is a brake state figure seen from the back side, (B) is a side view of an unlocked state. (A)-(F) is a component diagram of a brake mechanism. (A) of a lock and unlock mechanism is a top view, (B) is a sectional side view. FIG. 5A is a side view of a locked state, FIG. 5B is a side view of an unlocked state, FIG. 5C is a front view, and FIG. (A) is a brake state figure seen from the back side, (B) is a side view of a locked state. It is a figure which shows the structure of a wire, (A) is a top view, (B) is a side view, (C) is a figure which shows a brake piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 1a Base plate 3 Wheel 3b Rear wheel 10 Mounting main body 20 Spring 30 Brake shoe 31 Shoe main body 40 Wire 41a Rear wire pin 41b Front wire pin 50 Lock and unlock mechanism 70 Base 71 Brake shoe 72 Brake base 73 Spring 200 Elastic body (coil spring)
201 wire guide

Claims (2)

A vehicle capable of traveling with a front wheel and a fixed rear wheel (3b) attached to the back surface of the base plate,
Attach a pair of brake shoes (31) that can rotate and abut on the front and rear of the wheel after fixing to a base attached to a base plate or the like,
Attach wire pins (41a, 41b) to the ends of the pair of brake shoes,
Connected to the wire (40) covered with the wire guide with the spring (20) inserted between these wire pins (41a, 41b),
A brake mechanism for a vehicle, wherein an elastic body (200) is inserted between the wire pin (41a) and an end of the wire guide (201). A vehicle capable of traveling with a front wheel and a fixed rear wheel attached to the back of the base plate,
A base is attached to the base plate, etc., and a spring is provided so that the shoe body can always come into contact with the rear wheel side before and after the fixed rear wheel,
Attach wire pins (41a, 41b) to the ends of the pair of brake shoes,
The wire 40 fixed at the tip end with the wire stopper 45 is inserted through the wire hole 42b formed in the front wire pin 41b and the wire hole 42a formed in the rear wire pin 41a,
A vehicle brake mechanism comprising an elastic body (200) inserted between the rear wire pin (41a) and an end of a wire guide (201) covering the wire (40).

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