JP5913746B2 - Bogie structure - Google Patents

Description

  The present invention relates to an improvement of a cart structure capable of simultaneously braking or releasing the left and right wheels of the cart.

When the left and right wheels of the carriage are braked at the same time, the brake type that presses the wheel contact surface with a brake shoe may cause a brake slip or a change in braking force due to wheel wear.
Therefore, the applicant of the present invention is not limited to the braking device for a wheel such as Japanese Patent Application Laid-Open No. 2011-16407 in which braking or brake release is operated with a pair of braking levers or Japanese Patent Application Laid-Open No. 2010-163056 in which a pair of pedals are operated up and down. A method for locking the concave groove provided on the inner periphery of the wheel part has been proposed, and there is no corresponding brake slip, and a corresponding result that no braking force change due to wheel wear occurs.

JP 2010-163056 A JP 2011-16407 A

As a result of further intensive studies, the present applicant has completed a highly reliable cart structure in which the lock arm's tension at the time of locking is reduced to reduce the operating force of the lock pedal.
That is, the problem to be solved by the present invention is that when the lock pedal is pushed in, the cam of the cam arm pivots the lock arm via the cam surface and restrains the internal teeth formed on the inner peripheral surface of the wheel. By locking the lock arm, the lock arm tension at the time of locking is reduced and the operating force of the lock pedal is reduced.

In order to pass the above problem, in the present invention,
A brake pedal and a brake release pedal which are provided on the base plate of the carriage and can be raised and lowered;
A free hook piece that is biased in the engagement direction with the base side, engages with the base side during braking, and pivots from the engagement position to the disengagement position during operation of the brake release pedal;
A free link piece having a base end of the free hook piece pivoted to one end side and the other end fixed to the interlocking shaft;
A lock link piece having one end pivotally attached to the lower part of the brake pedal and the other end fixed to the interlocking shaft;
A base arm fixed to the interlocking shaft, a cam face provided at the tip, and a pair of left and right cam arms provided near the left and right wheels;
Internal teeth formed inside the left and right wheels;
A brake arm piece that has a wheel lock part that can be engaged with and disengaged from the inner tooth part and is pivotally attached to the base side, and is biased in the braking direction,
The brake arm piece is provided with a cam surface that pivots the brake arm piece so that the wheel lock part can be engaged with and disengaged from the tooth part of the internal tooth part by abutting with the cam face. And

As a result, in the present invention, a pair of left and right wheels can be braked or released with a simplified structure.
The brake release pedal engages and disengages the free hook piece from the base. The brake pedal rotates the interlocking shaft via the lock link piece, and synchronizes the cam arm piece and free link piece fixed to the interlocking shaft. Therefore, the brake arm piece can be braked or released by displacing the brake arm piece. Therefore, the tension of the brake arm piece during braking is reduced, and the operation force of the brake pedal is reduced.
Further, since the braking locks the internal teeth formed on the wheel, there is no brake slip and there is no change in the braking force due to wheel wear.
In addition, it is possible to prevent the load from being squeezed by providing a squeeze piece that folds or rises on the loading platform surface.
Further, by providing a detachable back plate on the handle, it can be used as a load for one arm protruding to one side of the carriage, and can be used as a spill-proof by setting the attachment position to an arbitrary position.

It is a bottom view of the back side of a trolley. It is a rear view of a trolley | bogie. It is the elements on larger scale of the back side of a trolley. (A) is sectional drawing which shows the locked state of the wheel on the same pedal side as an unlocking pedal, (b) is sectional drawing which shows the locked state of the wheel on the same pedal side as a lock pedal. (A) is sectional drawing which shows the state in the middle of unlocking of the wheel on the same pedal side as an unlocking pedal, (b) is sectional drawing which shows the state in the middle of unlocking of the wheel on the same pedal side as a locking pedal. (A) is sectional drawing which shows the unlocking state of the wheel on the same pedal side as an unlocking pedal, (b) is sectional drawing which shows the unlocking state of the wheel on the same pedal side as a locking pedal. It is a bottom view of a cam arm. (A) is a top view of a lock arm, (b) is a front view, (c) is a side view. It is a top view of the cart of the state where the handle of Example 2 was folded. It is a front view of the state which raised the handle. It is the same side view. The top view of the state which raised the anti-collision piece, (b) is the top view of the folded state. FIGS. 12A and 12B are cross-sectional views showing a state in which the spill prevention piece is erected. FIG. 12A is a cross-sectional view taken along the line A-A in FIG. It is CC sectional drawing of FIG.12 (b).

  Hereinafter, preferred embodiments of the carriage structure of the present invention will be described with reference to the drawings.

[Cart]
As shown in FIG. 1 and FIG. 2, the carriage 1 includes a platform 2 whose upper surface chamfered at both front and rear sides serves as a loading platform surface, and a handle (not shown) erected on one side of the platform 2. A pair of left and right wheels 3 provided at the front and rear at the bottom of the base plate 2 and a braking structure for braking the rear wheel 3 are provided.
The wheel 3 has a recess having a small diameter concentric with the outer periphery, and a gear-shaped inner tooth portion 4 formed of continuous unevenness is formed on the inner peripheral surface of the recess.
In the braking operation, a push-down brake release pedal 10 and a brake pedal 20 are arranged side by side in a recess 8 provided in a space between a pair of support legs (H) of a handle erected on the rear side of the base plate 2. ing.

[Brake release pedal]
The brake release pedal 10 has an elevating guide portion 15 for guiding the raising and lowering of the pedal at the inner rear, and a free guide portion 16 for releasing a free hook piece 11 described later from an engaged state when the pedal is lowered at the inner front. A coil spring 7 is provided for biasing the brake release pedal 10 upward.

  The raising / lowering guide portion 15 is inserted into a cylindrical portion 5a formed in the concave portion 8 of the base plate 2 holding the brake release pedal 10 with a small diameter at the upper stage and a large diameter at the lower stage, and slides up and down along the cylindrical portion 5a. The shaft portion 15a that moves is abutted at the upper end position of the large-diameter portion of the cylindrical portion 5a provided at the lower end of the shaft portion 15a, and the shaft portion 15a rises against the urging force upward by the coil spring 17 And a stopper 15b for restraining the movement.

The free guide portion 16 is fixed to the front inner wall surface of the brake release pedal 10 and has a guide surface 16a made of a curved surface at the lower end.
The coil spring 17 is disposed between the brake release pedal 10 and the bottom surface of the recess 8 at a position separated from the cylindrical portion 5a, and biases the brake release pedal 10 upward (FIGS. 4A to 6). (See (a)).

[Brake pedal]
The brake pedal 20 has an elevating guide portion 15 'for guiding the raising and lowering of the pedal in the front of the inside, and engaging or releasing the cam arm piece 22 via a lock link piece 21 described later when the pedal is lowered in the inside. A cylindrical actuating portion 26 that is displaced in the direction is integrally suspended (see FIGS. 4B to 6B).
The raising / lowering guide portion 15 ′ has the same structure as the raising / lowering guide portion 15 of the brake release pedal 10, and therefore the description thereof is omitted.

[Linked axis]
An interlocking shaft 30 having a rectangular cross section extends at a position crossing the lower center of the brake release pedal 10 and the brake pedal 20 at the lower part of the base board 2, and both ends of the interlocking shaft 30 are suspended from the left and right sides of the base board 2. It is supported by B (see FIG. 3).

[Free link piece]
The base end of the free link piece 12 is fixed to the interlocking shaft 30 below the brake release pedal 10, and the base end of the free hook piece 11 is pivotally attached to the tip of the free link piece 12 by the pivot P1. Yes.
The free link piece 12 rotates in conjunction with the rotation of the interlocking shaft 30 to raise and lower the free hook piece 12.

[Free hook piece]
The free hook piece 11 has a concave step portion 11b whose tip can be engaged with the protruding piece 6 of the base plate 2 formed slightly below the lowering position of the brake release pedal 10, and has a guide piece portion 11a whose upper portion is curved. The brake release pedal 10 is disposed at a position where it can collide with the tip of the free guide portion.
The protrusion 6 is formed in the base 2 below the lifting stroke of the brake release pedal 10, and the base 9 has a hole 9 for contacting the protrusion 6 and allowing the free hook piece 11 to be immersed therein. It is installed.

Accordingly, as the brake release pedal 10 is lowered, the guide surface 16a of the free guide portion 16 abuts with the guide piece portion 11a, and the protruding piece 6 starts from the locked position where the guide piece portion 11a is engaged with the protruding piece 6. Then, the engagement is released, and the position is moved to a position where the protrusion 6 is moved down and pushed down.
The free hook piece 11 is biased in a direction to engage with the protruding piece 6 by providing a spring on the pivot P1.

[Lock link piece]
Next, on the interlocking shaft 30 below the brake pedal 20, a lock link piece having one end pivotally attached to a long hole 26 a provided at the lower end of the operating portion 26 by a pivot P <b> 2 and the other end fixed to the interlocking shaft 30. 21 is attached, and when the brake pedal 20 is lowered, the interlocking shaft 30 is rotated in the braking direction (clockwise in the figure) via the lock link piece 21, and when the brake pedal 20 is raised, the interlocking shaft 30 is moved in the brake releasing direction. Rotate.

[Cam arm piece]
A cam arm piece 22 whose base end is fixed to the interlocking shaft 30 and whose tip abuts against the brake arm 31 of each wheel 3 is provided in the proximity position of the left and right wheels (rear wheels) 3 on the interlocking shaft 30. Yes.
The cam arm piece 22 has a roller-like cam face 23 at the tip.

[Brake arm piece]
The wheel 3 has a gear-shaped inner tooth portion 4 on an inner peripheral surface, and a brake arm piece 31 that engages with the inner tooth portion 4 is disposed adjacent to the inner tooth portion 4 side of the wheel 3. The upper part is pivotally attached to the base plate 2 by the pivot P3.
The brake arm piece 31 (see FIG. 8) has a channel cross section at the bottom, extends parallel to the axle of the wheel 3 and is disposed at a position where it can reach the inner tooth portion 4 and is fitted to one tooth portion 4 ′ by pivoting. And a wheel lock portion 32 for braking.

A spring S is attached to the pivot P3 to urge the brake arm piece 31 in the braking direction.
Further, a cam surface 33 having a substantially corrugated cross section is formed on the surface of the brake arm piece 31 that abuts the cam arm piece 22.

Accordingly, when the cam arm piece 22 is rotated by the rotation of the interlocking shaft 30, the cam face 23 collides with the cam surface 33. Therefore, when the cam arm piece 22 collides with the raised portion 33a of the cam surface 33, the cam arm piece 22 is braked against the urging force. On the contrary, when the cam face 23 abuts on the recessed portion 33c of the cam surface 33, the cam arm piece 22 can be displaced in the braking direction by the urging force.
The cam surface 33 is formed with a small recess 33b in the raised portion 33a so that the cam face 23 displaced in the brake release direction can be held at the brake release position.

Because of the above configuration, when the brake pedal 20 is depressed from the brake release state shown in FIG. 6, the lock link piece 21 is pushed down via the operating portion 26 and the interlocking shaft 30 rotates (FIG. 5B). reference).
As the interlocking shaft 30 rotates, the cam arm piece 22 pivots in the braking direction via the pair of lock link pieces 21, and the cam face 23 at the tip of the cam arm piece 22 moves into the recessed portion 33 c of the cam surface 33 of the brake arm piece 31. The wheel lock portion 32 of the brake arm piece 31 is guided and displaced from the position away from the inner tooth portion 4 of the wheel 2 to the engaged position to brake the wheel 3 (see FIG. 4).

Further, since the left and right lock link pieces 22 and the free link piece 12 rotate in synchronization with the rotation of the interlocking shaft 30, the free hook piece 11 pivotally attached to the free link piece 12 rises and gets over the protruding piece 6. As a result, the step portion 11b of the free hook piece 11 and the protruding piece 6 are engaged.
Thereby, since the rotation of the interlocking shaft 30 is restrained, the braking state can be locked.

  When the unlocking pedal 10 is depressed from the braking state as shown in FIG. It is pushed down while being disengaged from the shaft, and the constraint of the interlocking shaft 30 can be released (see FIG. 6A).

  The rotation of the interlocking shaft 30 causes the lock link piece 21, the cam arm piece 22, and the free link piece 12 to rotate synchronously, so that the cam arm piece 22 is displaced in the braking release direction, and the cam face 23 and the brake arm piece 31 The wheel lock portion 32 is disengaged from the tooth portion 4 ′ of the inner tooth portion 4 of the wheel 3 by the abutment with the cam surface 33, and the wheel 3 can travel.

The cart 1 shown in FIG. 9 to FIG. 11 has a structure in which a detachable back plate 50 is provided on the handle H, and a pin 41 that has a folding stop piece 40 that can be folded at the frontmost part of the base plate 2 and at the three left and right sides. The different Example provided foldably via is shown.
That is, the folding stop piece 40 is folded so as to be flush with the top surface of the base plate 2 when folded (see the dotted lines in FIGS. 12B and 13B), and the top surface of the base plate 2 is unfolded. It has a structure that is developed so as to stand substantially perpendicular to (see FIGS. 12A and 13A to 13B).

That is, as shown in FIG. 13 (c), the pin 41 is hooked so as not to come out to the top plate side, and the anti-collision piece 40 has the outer surface when folded in the same plane as the surface of the top plate 2. It is accommodated in the receiving portion 42 that is recessed.
The pin 41 protrudes from the proximal end side of the anti-collision piece 40, and a space 44 in which the base end side of the anti-collision piece 40 is rotatable is formed, and the anti-collision piece 40 is formed below the space 44. A plurality of support pieces 43 (three in the illustrated example) are provided to support this when standing.

Therefore, when the anti-collision piece 40 is erected from the horizontal folding posture, the proximal end side of the anti-collision piece 40 is slightly lowered into the space 44 and is supported by the support piece 43 in this state, and at the same time, the anti-collision piece is stopped. Since the further rotation is restricted by the restriction wall 45 formed in the front in the rotation direction when the piece 40 stands up, the standing posture is locked.
When folding, it is possible to return to the horizontal position by slightly lifting up the anti-collision piece 40 and then rotating it to the receiving portion 42 side.
In this embodiment, the anti-collision piece 40 is provided in front of the loading platform surface of the base board 2 and on both the left and right sides of the midway position. However, an arbitrary number of anti-collision piece 40 is provided at an arbitrary position as necessary. Also good.

Thereby, by raising the anti-collision piece 40, it is possible to prevent the load on the base board 2 from being displaced to the outside due to vibration or the like.
In addition, when not in use, it can be stored flat so as to be flush with the upper surface of the base plate 2, so that the folding or unfolding posture of the fold-off stop piece 40 can be properly used depending on the type of the load, and the storage of the cart 1 itself is also space-saving. It can be.

Furthermore, in this embodiment, as clearly shown in FIG. 10, the handle H is provided with a detachable back plate 50.
The back plate 50 has a restraining portion 52 that is attached to the shaft of the handle H and is rotatably constrained on one side of a back plate main body 51 that extends to the left and right. The structure is provided.

In this embodiment, the restraining portion 52 is composed of a pair of upper and lower restraining portions, one of which is a substantially semicircular arc-shaped latching configuration portion 52a that is latched on the front side of the handle H shaft, and the other is the handle H. This is a latching component 52n having a substantially semicircular arc shape that is reversed and is latched on the rear surface side of the shaft.
As a result, when restraining to the shaft of the handle H, one of the latching components of the restraining portion 52 is latched on the shaft, and the other latching components 52a and 52b are hooked on the shaft while twisting the other latching component. Since it stops, the front and back of the shaft are hooked at the same time, so that it can be used as a fixed side during rotation.

   The attaching / detaching portion 53 has a hooking direction set to one side, and in the illustrated example, the upper and lower latching portions are latching constituent portions in the same direction, so that it can be hooked on the shaft of the handle H without being twisted as it is. It can be easily removed from the shaft by pulling in the opposite direction to the latch.

Thereby, the said back board 50 can be rotated to the outward of a handle | steering-wheel by removing the attaching / detaching part 53 from the axis | shaft of the handle | steering-wheel H, and rotating it with the restraint part 52 as a base point, and can be used as a loading part. .
Further, since the back plate 50 can be attached to and detached from the handle H, the back plate 50 can be attached to an arbitrary position of the handle H. For example, by attaching the back plate 50 to a low position of the handle H, the back plate 50 is used as a spill-proof to the rear of the load. It is also convenient.

Further, the left and right side surfaces of the base plate 2 are provided with a concave shape 60 in which a loading hook can be accommodated, so that the hook and the string can be prevented from being displaced when the luggage is fixed.
Further, by arranging the wheel 3 directly below the handle storage groove 28 provided in the base plate 2, the base plate strength that tends to be insufficient by the groove 28 can be compensated.

In the above embodiment, the interlocking shaft has a square shape, but may have any cross-sectional shape. In short, any configuration may be used as long as the lock link piece, the cam arm piece, and the free link piece are rotated in synchronization.
In addition, it goes without saying that various design changes can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Carriage 2 Base 3 Wheel 4 Internal tooth part 5a Tube part 6 Projection piece 10 Brake release pedal 11 Free hook piece 12 Free link piece 15 Lifting guide part 15a Shaft part 15b Stopper 16 Free guide part 17 Coil spring 20 Brake pedal 21 Lock Link piece 22 Cam arm piece 23 Cam face 25 Elevating guide part 26 Actuating part 30 Interlocking axis (actuating axis)
31 Brake arm piece 32 Wheel lock part 33 Cam surface 40 Collet stop piece 50 Back plate

Claims (5)

A brake pedal and a brake release pedal which are provided on the base plate of the carriage and can be raised and lowered;
A free hook piece that is biased in the engagement direction with the base side, engages with the base side during braking, and pivots from the engagement position to the disengagement position during operation of the brake release pedal;
A free link piece having a base end of the free hook piece pivoted to one end side and the other end fixed to the interlocking shaft;
A lock link piece having one end pivotally attached to the lower part of the brake pedal and the other end fixed to the interlocking shaft;
A base arm fixed to the interlocking shaft, a cam face provided at the tip, and a pair of left and right cam arms provided near the left and right wheels;
Internal teeth formed inside the left and right wheels;
A brake arm piece that has a wheel lock part that can be engaged with and disengaged from the inner tooth part and is pivotally attached to the base side, and is biased in the braking direction,
The brake arm piece is provided with a cam surface that pivots the brake arm piece so that the wheel lock part can be engaged with and disengaged from the tooth part of the internal tooth part by abutting with the cam face. The trolley structure. The protruding piece formed on the base plate below the lifting / lowering stroke of the brake release pedal and the free hook piece can be engaged and disengaged,
The brake release pedal is provided with a free guide portion that abuts with the free hook piece when the brake release pedal is lowered and displaces the free hook piece from the engagement position with the projection piece to the release position. The cart structure according to claim 1. The brake arm piece is arranged close to the inner tooth side of the wheel to be braked,
The wheel lock portion has a cross-sectional channel shape and extends to the corresponding position of the inner tooth portion of the wheel. The cart structure according to claim 1 or 2, wherein   2. A plate-shaped squeeze stop piece that has a receiving part that is accommodated on the same surface as the upper surface of the base plate when folded, and is provided with a plate-shaped stopper that rises on the base plate when standing. 4. The cart structure according to any one of 3 to 4. A handle is provided on the carriage, and a removable back plate is attached to the handle.
One of the back plates is provided with a restraining portion having a latching structure that is hooked on the front and rear of one shaft of the handle, and is attached to the other side of the back plate on the front or rear of the other shaft of the handle. The trolley | bogie structure in any one of Claim 1 to 4 provided with the possible attachment or detachment part.

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