JP5932673B2 - Brake braking structure - Google Patents

Description

  The present invention relates to a braking structure for a carriage in which a wheel can be driven by releasing the braking of the wheel by holding a brake lever provided on the hand handle together with the handle, and the wheel can be braked by releasing the brake lever. is there.

As a structure for braking the wheels of the carriage, for example, the transport carriage disclosed in Japanese Patent Application Laid-Open No. 2011-979 has a loading platform on which the load can be placed, a pair of vertical columns, and a gripping portion that connects the upper portions of the columns. And a pair of fixed wheels attached to the handle-side lower surface of the cargo bed and a pair of free wheels attached to the lower side of the anti-handle side. An operation lever that is pivotally mounted in the vicinity of the grip portion of the handle, a connecting rod that is connected to the operation lever and is fitted into the support column, and an upper end that is within the lower part of the support column. The brake rod is pivotally connected to the lower end of the connecting rod, and the brake portion is provided at the lower end of the connecting rod, and the brake portion is always urged by the spring so as to press the outer peripheral surface of the fixed wheel. And when the operation lever is not operated, the brake part is pressed against the outer peripheral surface of the fixed wheel to prevent the rotation of the fixed wheel, and the brake part is biased by a spring when the operation lever is operated. The operation lever and the connecting rod are folded together with the handle on the cargo bed by rotating the handle in the folding direction while allowing the fixed wheel to rotate against the fixed wheel. A transport cart characterized by the above is disclosed.
However, in the above configuration, since the operation lever and the brake portion are connected using the connecting rod fitted into the support column, the operation lever is pivotally attached to the support column inside the support column, and the operation lever and the connecting rod are pivoted. It was necessary to put on the clothes inside the column.
Therefore, when repairing or replacing the operation lever, it is necessary to always disassemble the support column, which is a complicated operation.
In addition, since the connecting rod and the brake part are pivotally attached, the connecting rod is also folded in conjunction with the handle and the connection with the brake part is disconnected. Even if the lever is operated, the braking of the fixed wheel cannot be released at all, and there is a problem that there is no way to drive the fixed wheel when the handle is folded.

JP 2011-979 A

  The present invention was devised in view of the above circumstances, and the operation lever is pivotally mounted outside the column portion of the handle so that the operation lever can be easily replaced and repaired. An object of the present invention is to provide a braking structure for a carriage in which the operation lever and the brake part are always connected regardless of the attitude of the handle by connecting the brake part with the brake wire.

In order to achieve the above object, in the invention of claim 1,
A handle having a grip portion for connecting the upper portions of a pair of left and right support columns standing on a loading platform of the carriage, a pair of lever pieces pivotally attached to the pair of support columns of the handle, and An operation lever composed of an operation gripping part connected between the upper parts and disposed along the gripping part of the handle, a brake wire having an upper end attached to the operation lever, and fixed to the bottom surface of the cargo bed and extending downward, A support body pivotally attached to a braking arm that is urged in the braking direction to brake or release the wheel, and the wheel has a recessed portion formed concentrically with the tread surface, and the recessed portion In the inner brake surface, a concave and convex surface having a concave surface and a convex surface is continuously formed in an annular shape, and in the braking structure of the carriage, the braking portion provided on the braking arm is engaged with and disengaged from the concave surface .
The brake arm has a base end pivotally attached to the lower end side of the support body , and has a brake part at the tip and is urged upward in the braking direction,
Consists of a hydraulic regulating piece pivotally mounted on said support with said actuating piece coaxially,
The lower end of the brake wire is fixed to the outer end serving as the rear of the operating piece on the acting dynamic regulating piece, and provided with a pair of upper and lower regulating portion for regulating the pivoting of the operating piece on the other end,
The pair of upper and lower restricting portions are set so that the operating piece can be pivotally displaced against the biasing force within the range,
When the operating lever is operated to a position that overlaps the handle, the restricting portion of the operation restricting piece pivots in the braking direction via the brake wire, and the actuating piece is displaced in the braking direction by the urging force and the braking of the wheel is released. And
When the operating lever is released and displaced in the direction away from the handle, the operation restricting piece pivots in the braking release direction against the urging force of the operating piece at the braking position, and the wheel is braked. And
In the invention of claim 2,
The support column is pivotally attached to a bracket erected on a cargo bed and attached to be able to undulate.
In the invention of claim 3,
The wheel is formed concentrically with the tread surface and has a recess, and an uneven surface is continuously formed on the inner peripheral surface of the recess,
The braking structure for a carriage according to claim 1 or 2, wherein the braking portion is formed of a lock member that is provided at a distal end of the operating piece and is detachable from the concave surface.
In the invention of claim 4,
It said support, and a vertical support part extending vertically, has become and a transverse support portion extending center is fixed laterally at the intermediate position of the vertical support,
The lower end of the outer cable of the brake wire is connected to one end of the lateral support, the lower end of the inner cable extending from the outer cable is fixed to the operation restricting piece, and the other end is interposed between the operating piece. The upper end of the coil spring is hooked.

  In the braking structure of the carriage of the present invention, the operation lever is pivotally attached to the outside of the column portion of the handle so that the operation lever can be easily replaced and repaired, and the brake wire is provided between the operation lever and the brake portion. By connecting with each other, the operation lever and the brake unit are always connected regardless of the posture of the handle, and the braking operation can be performed with the operation lever.

It is a perspective view of the trolley | bogie of Example 1. FIG. It is the same rear view. It is the perspective view seen from the diagonally back related to an operation lever. It is the same side view. It is the perspective view seen from the back regarding a brake part. It is a perspective view which shows the wheel and brake part of a braking state. It is a side view of the trolley | bogie at the time of braking cancellation | release . It is an enlarged view of the wheel part at the time of brake cancellation | release . It is a side view of the cart at the time of braking. It is an enlarged view of the wheel part at the time of braking.

  Connect the operation lever and the brake part with a brake cable, and when driving, hold the operation lever together with the handle to release the wheel braking, and when stopping, release the operation lever to brake the wheel. Thus, the operation lever and the brake cable can be easily exchanged, and the operation lever can be connected to the brake portion regardless of the attitude of the handle to enable braking or brake release.

[Cart]
As shown in FIGS. 1 to 6, the cart 1 of this embodiment has a handle 3 erected on the loading platform 2 of the cart 1 and an operation lever 4 pivotally attached to the handle 3. The inner receiving part 5 fixed to the operating lever 4, the outer receiving part 13 fixed to the bottom surface of the loading platform 2, the inner cable 7 and the inner receiving part 5 and the outer receiving part, the upper ends of which are hooked on the inner receiving part 5 A brake wire 9 comprising an outer cable 8 interposed between 13 and a brake arm 15 pivotally attached to the lower part of the loading platform 2 and biased in the wheel braking direction and having a braking pin 16 serving as a braking part. Thus, the lower end of the inner cable 7 is connected to one end of the brake arm 15, and the brake arm 15 is interlocked by the pivot of the operation lever 4 to brake or release the wheel (rear wheel) 20 by the brake pin 16. Consist of There.
In the present embodiment, the braking target is the rear wheel, but it may be the front wheel or both the front and rear wheels. Reference numeral 20 'denotes a wheel (front wheel) without a braking mechanism.

[handle]
The handle 3 is formed of a horizontally inverted substantially U-shaped pipe comprising a pair of left and right support columns 3a erected on the loading platform 2 of the carriage 1 and a gripping portion 3b connecting the upper portions of the support columns 3a. Yes.
In this embodiment, the handle 3 is pivotally attached to the pair of left and right brackets 2B which are erected and fixed on the loading platform 2 by the pivot P1 on the base side (lower end side) of each column part 3a, and folds up and down freely. be able to.

  As shown in FIG. 7 (b), the handle 3 includes a pin 3d fixed at a position below and forward of the first pivot P1 of the bracket 2B, and a lock urged in a locking direction across the lower portion of the handle 3. The handle 3 can be folded (not shown) by restraining the handle 3 in an upright posture with the bar 3c and separating the lock bar 3c rearward against the urging force.

[Control lever]
The operation lever 4 connects between a pair of lever pieces 4a pivotally attached to a fixed portion 6 that is fitted and fixed to a pair of support columns 3a of the handle 3, and an upper portion of the lever piece 4a. And an operation gripping portion 4b disposed along the gripping portion 3b.
The lever piece portion 4a is formed of a substantially L-shaped plate that extends in a straight line and bends at a substantially right angle at an intermediate position, and an end portion of an operation gripping portion 4b made of a saddle material such as a pipe is fixed to the upper end thereof. (See FIG. 3 and FIG. 4).

[Fixed part]
As is clear from FIG. 3, the fixing portion 6 is formed of a substantially cylindrical body having connecting pieces separated from each other at the center and folded back at the separated portions to face each other. Are fixed to the handle 3 by tightening with the overlapping bolt B.

The base end of the second pivot P2 is fixed to the fixed portion 6, and the lower end of the lever piece 4a of the operation lever 4 is pivotally attached to the second pivot P2.
The lever piece portion 4a integrally has an inner receiving portion 5 at an intermediate corner portion.
The inner receiving portion 5 has a groove for hooking a hooking portion 7a at the upper end of an inner cable 7 of a brake wire 9 described later and allowing the subsequent inner cable 7 to pass therethrough.

  In addition, in the illustrated example, a base end of an outer mounting piece 8a bent in a hook shape is pivotally attached to the second pivot P2 between the lever piece portion 4a and the peripheral wall of the fixed portion 6. The tip of 8a is bent in an angle shape so as to face the lower side of the inner receiving portion 5, and the upper end of the outer cable 8 of the brake wire 9 is restrained to extend the brake wire 9 downward.

Since it has the above-described configuration, it will be described with reference to FIG. 4. When the operating lever 4 is pivoted in the direction approaching the handle 3 (clockwise in the figure), the latching portion 7a is also displaced at the same time, and the inner cable 7 Tow upward.
When a load is applied to the outer cable 8 by pulling the inner cable 7, the outer mounting piece 8a pivots, so that the outer cable 8 can be displaced so as to follow the posture of the inner cable 7 and not twist.

[Brake wire]
The brake wire 9 has the same structure as a known Bowden wire used for a brake of a bicycle in which the inner cable 7 is built in the outer cable 8.
And as mentioned above, the upper end of the inner cable 7 is latched by the inner receiving part 5 of the lever piece part 4a via the latching part 7a.
The upper end of the outer cable 8 is attached and fixed to the outer attachment piece 8a.

  The brake wire 9 descends along the support column 3b of the handle 3 and passes through a wire fitting insertion hole H formed through the loading platform 2. On the bottom side of the loading platform 2, the lower end of the inner cable 7 is a brake described later. Connected to the arm 15, the lower end of the outer cable 8 is fixed to a support 10 described later (see FIGS. 5 and 6).

[Support]
A support 10 that supports the braking structure is fixed to the bottom surface of the loading platform 2.
As shown in FIG. 5 and FIG. 6, the support 10 includes a loading platform mounting piece 10 a for fixing to the bottom surface of the loading platform 2, a vertical support portion 11 extending vertically from the mounting piece 10 a, and a midway position of the vertical support portion 11. And a lateral support portion 12 extending laterally.
The vertical support portion 11 hangs from the mounting piece 10a and has an angled first hanging piece 11a bent at the lower end, and a second hanging piece 11b bent in a stepped manner and fixed on the first hanging piece 11a. It has become.

The lateral support piece 12 is inserted into the gap between the bent portions of the first and second hanging pieces 11a and 11b and fixed to both at the center.
The horizontal support piece 12 has an intermediate portion that extends horizontally and is fixed to the vertical support portion 11 at the center, and both end sides are bent upward in an angle shape.
And the horizontal part of one bending part is the outer receiving part 13, and the lower end of the said outer cable 8 is connected and fixed.
A through hole 12a is formed in the horizontal portion of the other bent portion so as to hook an upper end of a coil spring 17 described later.

[Brake arm]
A braking arm 15 is pivotally attached to the lower end side of the second hanging piece 11b by a third pivot P3.
Although the brake arm 15 may be an integral operating piece, in the present embodiment, the braking arm 15 is composed of two structural members, that is, an operation regulating piece 15a and an operating piece 15b.

The operation restricting piece 15a is screwed with a fixing screw N having a hole through which the inner cable 7 can be inserted, and the lower end of the inner cable 7 can be fixed to the operation restricting piece 15a at an arbitrary position. .
In addition, the other ends are formed with restriction portions 151 and 152 that are bent substantially vertically at both ends in the vertical direction, and restrict the pivot range of the operating piece 15b.

The actuating piece 15b is pivotally attached to the third pivot P3 on the base end side, a hole is formed at an intermediate position, and the lower end of the coil spring 17 is latched.
In addition, a braking pin 16 is provided at the front end of the operating piece 15b so as to project laterally.
The operation piece 15b is pivotally attached to the third pivot P3 together with the operation restriction piece 15a, and interlocks with the operation restriction piece 15a while being restricted by the restriction portions 151 and 152 of the operation restriction piece 15a.

That is, since the operating piece 15b is constantly urged by the coil spring 17 in the braking direction (upward in this embodiment), the operating piece 15b is in a position where it abuts with the restricting portion 151 above the operation restricting piece 15a. Placed in.
When the inner cable 7 is pulled by the operation lever 4 and pulled upward in the figure, the operation restricting piece 15a pivots counterclockwise in FIG.
As a result, the operating piece 16b is also interlocked, and the brake pin 16 is displaced downward in the figure.

Here, the wheel 20 has a recessed portion 21 formed concentrically with the tread surface, and a concave and convex surface 22 having a substantially corrugated cross section composed of a concave surface 22a and a convex surface 22b is annularly formed on the inner peripheral surface of the concave portion 21. It is formed continuously.
And the said brake pin 16 is set to the shape which can be engaged / disengaged with the said concave surface 22a.

Further, since the operating piece 15b can be displaced against the urging force of the coil spring 17 in the range of the upper and lower restricting portions 151, 152 of the operation restricting piece 15a, the braking pin 16 is on the convex surface 22b during braking. The actuating piece 16 stops at the abutting position with the convex surface 22b, but the actuating restriction piece 15a pivots until the actuating piece 15b abuts the lower regulating portion 152, and the biasing force of the coil spring 17 in the braking direction. To increase.
Therefore, the brake pin 16 can get over the concave surface 22a by overcoming the convex surface 22b by the urging force.

  7 and 8 are views showing the relationship between the operation lever 4 and braking. Normally, during traveling, as shown in FIG. 7A, the user can operate the operation grip 4b of the operation lever 4 and the handle 3 as shown in FIG. By simultaneously gripping and tightening the grip portion 3b with the hand, the braking of the wheel 20 can be released and the carriage 1 can be run.

That is, as described above, since the operation lever 4 is operated so as to overlap the handle 3, the inner cable 7 is pulled, and the brake arm 15 is pivoted counterclockwise.
As a result, the braking pin 16 is displaced to a position away from the uneven surface 22 shown in FIG. 7B, so that the braking of the wheel 20 is released and the vehicle 1 can travel.

  Next, as shown in FIG. 8A, when the user releases the hand holding the operation grip 4b of the operation lever 4, the operation grip 4b is displaced in a direction away from the grip 3b of the handle 3. Then, the wheel 20 is braked and the carriage 1 can be stopped.

That is, as described above, the operation lever 4 is separated from the handle 3, and the inner cable 7 extends downward and returns to the original position, thereby pivoting the brake arm 15 in the clockwise direction.
As a result, the brake pin 16 is displaced to a position where the brake pin 16 is immersed in the concave portion 22a of the concave-convex surface 22 shown in FIG. 8B, so that the wheel 20 is braked and the carriage 1 can be stopped.

  Thus, in this embodiment, the handle 3 has a structure that can be folded along the loading platform 2. However, even if the handle 2 is folded, the structure of the brake wire 9 is not affected. Even when stacked up and down in a folded state, the operation lever 4 of the lowermost carriage 1 is operated, so that the braking of the wheels 20 can be released and moved.

  Further, since the brake wire 9 can be arranged along the handle 3, it can be easily attached, replaced, and repaired, and the attachment position between the lower end of the inner cable 7 and the braking portion 16 can be adjusted. Thus, the brake stroke of the operation lever can be finely adjusted.

In the present embodiment, the case where the braking pin is used as the braking portion and the braking pin is immersed in the concave portion of the uneven surface formed on the inner peripheral surface of the wheel for braking is illustrated. It may be.
The present invention is not limited to the above-described embodiment, and it is needless to say that various design changes can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Cargo 2 Cargo 2B Bracket 3a Support | pillar part 3b Gripping part 3 Handle 4 Operation lever 4a Lever piece part 4b Operation holding part 5 Inner receiving part 6 Fixing part 7 Inner cable 7a Hook part 8 Outer cable 8a Outer mounting piece 9 Brake wire 10 Support body 11 Vertical support portion 10a Loading platform mounting piece 11a First hanging piece 11b Second hanging piece 11c Bending piece 12 Horizontal support portion 12a Spring hooking portion 13 Outer receiving portion 14 Pivoting restriction portion 15 Brake arm 15a Operation restriction piece 15b Actuating piece 16 Brake pin 17 as an example of a brake part Coil spring 20 as an example of an urging means Wheel 21 Depressed part 22 Uneven surface 22a Concave surface 22b Convex part P1 First pivot P2 Second pivot P3 Third pivot

Claims (4)

A handle having a grip portion for connecting the upper portions of a pair of left and right support columns standing on a loading platform of the carriage, a pair of lever pieces pivotally attached to the pair of support columns of the handle, and An operation lever composed of an operation gripping part connected between the upper parts and disposed along the gripping part of the handle, a brake wire having an upper end attached to the operation lever, and fixed to the bottom surface of the cargo bed and extending downward, A support body pivotally attached to a braking arm that is urged in the braking direction to brake or release the wheel, and the wheel has a recessed portion formed concentrically with the tread surface, and the recessed portion In the inner brake surface, a concave and convex surface having a concave surface and a convex surface is continuously formed in an annular shape, and in the braking structure of the carriage, the braking portion provided on the braking arm is engaged with and disengaged from the concave surface .
The brake arm has a base end pivotally attached to the lower end side of the support body , and has a brake part at the tip and is urged upward in the braking direction,
Consists of a hydraulic regulating piece pivotally mounted on said support with said actuating piece coaxially,
The lower end of the brake wire is fixed to the outer end serving as the rear of the operating piece on the acting dynamic regulating piece, and provided with a pair of upper and lower regulating portion for regulating the pivoting of the operating piece on the other end,
The pair of upper and lower restricting portions are set so that the operating piece can be pivotally displaced against the biasing force within the range,
When the operating lever is operated to a position that overlaps the handle, the restricting portion of the operation restricting piece pivots in the braking direction via the brake wire, and the actuating piece is displaced in the braking direction by the urging force and the braking of the wheel is released. And
When the operating lever is released and displaced in the direction away from the handle, the operation restricting piece pivots in the braking release direction against the urging force of the operating piece at the braking position, and the wheel is braked. The dolly braking structure.   2. The braking structure for a carriage according to claim 1, wherein the column portion of the handle is pivotally attached to a bracket erected on the loading platform so as to be raised and lowered. The wheel is formed in a concentric small diameter with the tread surface and has a recess, and an uneven surface is continuously formed on the inner peripheral surface of the recess,
The braking structure for a carriage according to claim 1 or 2, wherein the braking portion is formed of a lock member that is provided at a distal end of the operating piece and is detachable from the concave surface. The support body is composed of a longitudinal support portion extending vertically and a lateral support portion extending laterally with the center fixed at a midway position of the longitudinal support portion,
The lower end of the outer cable of the brake wire is connected to one end of the lateral support, the lower end of the inner cable extending from the outer cable is fixed to the operation restricting piece, and the other end is interposed between the operating piece. 4. The braking structure for a cart according to claim 1, wherein an upper end of the coil spring is hooked.

Images