JP2003019959A - Height adjusting mechanism of handle and seating seat in pushcart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a height adjusting mechanism adjusting a seat part of a seating seat and the height of a handle, and superior in convenience in use in a pushcart. SOLUTION: In a handle height adjusting mechanism 40 and a seat part height adjusting mechanism 50 of the push cart 1, a plurality of positioning holes 48c and 58c are arranged in the pipe lengthwise direction on the opposed surface side of respective support pipes 41 and 51. The handle 12 and the seat part 60 have a pair of left and right handle pipes 44 freely slidable in the lengthwise direction to the respective support pipes 41 and 51, a guide part 54, and connecting horizontal pipes 42 and 52 for connecting both of the handle pipes 44 and the guide part 54. The connecting horizontal pipes have hollow parts 43 and 53, openings 48b and 48b formed in a support pipe side end surface of the hollow parts, a pair of left and right lock pins 48 and 58 housed in the hollow parts, and freely taken in and out of the openings of the hollow parts, and operation knobs 46 and 55 projecting outward from the lock pins.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a wheelbarrow,
In particular, the present invention relates to a height adjustment mechanism for adjusting the height of the seat portion, handle, etc. of a seat in various handcarts such as a wheelbarrow for the elderly, a stroller, and a shopping cart.

[0002]

2. Description of the Related Art A wheelbarrow that is pushed by a user, such as an elderly person or a physically handicapped person with lower limbs, is provided with a stool seat for the user to rest temporarily while walking. There are types.

The seat of a wheelbarrow equipped with a stool seat is
It is generally fixed to the wheelbarrow frame at a height compatible with standard height. That is, the user cannot freely adjust the seat height in the conventional seat for a handcart.

Therefore, the stool seat fixed at a predetermined height according to the standard height is inconvenient for a person with a high height or a person with a short height. Nevertheless, there is currently no handcart provided with a seat height adjusting mechanism for adjusting the seat height.

On the other hand, it is well known that a wheelbarrow is provided with a handle height adjusting mechanism for adjusting the height of the handle.

As the handle height adjusting mechanism, for example,
Through holes provided in the guide portion of the handle that is slidable with respect to the left and right frames, a plurality of positioning screw holes provided in the left and right frames, and two mounting screw members screwed into the respective positioning screw holes. The configuration consisting of is common. In such a height adjusting mechanism, the height of the handle is adjusted by screwing the left and right mounting screw members into predetermined positioning screw holes through the through holes.

By the way, the person who uses the wheelbarrow is, in the first place, a physically weak person such as an elderly person or a person with a lower limb. Therefore, the screwing work, which seems to be a relatively easy work for a healthy person, is a very difficult work and a burden for a physically handicapped person.

Further, in order to adjust the height of the handle, it is possible to temporarily remove the respective mounting screw members attached to the left and right positioning screw holes and then attach the mounting screw members to another positioning screw hole. Done. At that time, there is also a problem that the removed mounting screw member may be lost.

Further, there is a problem that the handle height adjusting mechanism does not function as a result because it becomes difficult to remove the mounting screw member from the screw hole due to the rust of the screw or the damage of the screw thread due to long-term use.

Further, since the mounting screw member protrudes outward from the frame, the protruding mounting screw member may come into contact with a person around the handcart and injure the surrounding people. There is a problem in terms of safety and health,
There is also a design problem that the cluttered design is caused by the presence of the protruding mounting screw member.

[0011]

SUMMARY OF THE INVENTION Therefore, the technical problem to be solved by the present invention is to provide a height adjusting mechanism for adjusting the height of the seat portion or the handle of a stool seat, which is easy to use in a handcart. Is to provide.

[0012]

In order to solve the above technical problems, a handlebar height adjusting mechanism for a handcart according to the present invention has the following features.

That is, the wheelbarrow is provided with a handle on an upper portion of a frame forming a skeleton of a vehicle body, and the frame has a pair of parallel handle support pipes extending in a substantially vertical direction to support the handle. The handle includes a pair of parallel handle pipes extending substantially downward from the left and right handle grips, and the lower ends of the handle pipes are slidably fitted on the upper ends of the handle support pipes. It is a structure that will be. In this handcart, a connecting horizontal pipe integrally connecting the pair of handle pipes to each other so as to communicate with each other, a pair of left and right lock pins slidably housed in a hollow portion of the connecting horizontal pipe, and the lock pins. A plurality of operation knobs that are fixed to the handle horizontal pipes and project outward from slots formed in the axial direction at predetermined positions of the connecting horizontal pipes. Positioning holes are formed in the vertical direction, the hollow portion of the connecting horizontal pipe and the hollow portion of the handle pipe communicate with each other, and after adjusting the height position of the handle pipe with respect to the handle support pipe, Fix the handle to the support pipe by operating each operation knob and inserting the tip of each lock pin into the corresponding positioning hole of each handle support pipe. It is characterized in that it has a so that.

According to the above construction, after the handle pipe is roughly positioned with respect to the handle support pipe, the pair of left and right lock pins housed in the hollow portion of the connecting horizontal pipe are slid while the handle is slid up and down slightly. The lock pin is inserted into the positioning hole of the handle support pipe by pressing it toward the handle support pipe. That is, since the handle is fixed to the handle support pipe by a simple work of inserting the lock pin while sliding the handle, even the physically handicapped person such as an elderly person or a person with a lower limb can increase the height of the handle. Adjustments can be made easily. Moreover, since the lock pin is not removed from the hollow portion of the connecting horizontal pipe, the lock pin is not lost. Further, since the handle height adjusting mechanism is arranged inside the frame, it is excellent in terms of safety and hygiene and design.

The stool seat height adjusting mechanism for a handcart according to the present invention has the following features.

That is, the handcart is provided with a seat portion of a seat for seating at a substantially central portion of a frame forming a skeleton of a vehicle body, and the frames are mutually extending in a substantially vertical direction to support the seat portion. The seat portion includes a pair of parallel seat portion support pipes, and the seat portion includes a pair of parallel guide portions extending in a substantially vertical direction. It is a structure that is fitted. In a handcart, a connecting horizontal pipe that integrally and communicatively connects the pair of guide portions, a pair of left and right lock pins slidably housed in a hollow portion of the connecting horizontal pipe, and each of the lock pins. A plurality of operation knobs that are fixed and that project outward from slots formed in the axial direction at predetermined positions of the connecting horizontal pipe, and that are provided on the opposite surface side of each seat support pipe to cooperate with the lock pin. Positioning holes are formed in the vertical direction, the hollow part of the connecting horizontal pipe and the hollow part of the guide part communicate with each other, and after adjusting the height position of the guide part with respect to the seat part support pipe, By operating each operation knob and inserting the tip of each lock pin into the corresponding positioning hole of each seat support pipe, the seat of the stool seat is fixed to the support pipe. It is intended to.

According to the above structure, similarly to the handle, even a physically handicapped person such as an elderly person or a person with a lower limb can easily adjust the height of the seat of the seat. Moreover, the problem of loss of the lock pin is solved, and it is excellent in terms of safety and hygiene and design.

Preferably, a compression elastic member is disposed between the pair of left and right lock pins, and each lock pin is elastically biased toward the opposing support pipe.
Then, with the left and right operation knobs moved close to each other, position the tip of each lock pin in the corresponding positioning hole of each support pipe, and then release the left and right operation knobs to move the tip of each lock pin to each support pipe. Insert it into the corresponding positioning hole.

According to the above construction, since the urging force for urging each lock pin to the positioning hole of the support pipe is always applied, the urging force is applied when the guide part is slightly slid up and down for positioning. The biased lock pin is automatically inserted into the positioning hole, and the lock pin is less likely to come off the positioning hole after the insertion. Therefore, even a physically weak person such as an elderly person or a person with a lower limb can surely and easily adjust the height.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a perspective view showing a handcart 1 including a height adjusting mechanism 40 of a handle 12 and a height adjusting mechanism 50 of a seat portion 60 of a seat 14 according to the present invention. The handcart 1 shown in FIG. 1 is substantially bilaterally symmetric, and has a pair of left and right pipe-shaped frames 10 that form a framework of a vehicle body, a handle 12 that is attached to an upper portion of the frame 10 and has a substantially H shape, and a frame 10. A front wheel 15 and a rear wheel 16 attached to the lower part of the vehicle, a stool seat 14 arranged substantially in the center of the frame 10, a handle height adjusting mechanism 40 for adjusting the height of the handle 12, and a stool seat 14 And a seat height adjusting mechanism 50 for adjusting the height of the seat 60.

The frame 10 has a pair of parallel handle support pipes 41 extending in a substantially vertical direction for supporting the handle 12, and a substantially vertical direction for supporting the seat 60 while being connected to the front wheel 15. A pair of seat portion support pipes 51 extending in parallel with each other and a rear wheel support pipe connected to the rear wheel 16.

As shown in FIGS. 4 and 7, at predetermined positions on the inner surfaces of the handle support pipes 41 and the seat support pipes 51 facing each other, the handle positioning holes 48c are formed in the longitudinal direction of the frame. A plurality of seating positioning holes 58c are provided respectively. Further, the backrest 64 of the seat 14 is fixed to the handle support pipes 41 so as to straddle the left and right handle support pipes 41 substantially below the left and right handle support pipes 41.

The handle 12 is connected to both the left and right handle pipes 44 and the left and right handle pipes 44 which are slidably inserted into the left and right handle support pipes 41 and are integrated with the left and right handle pipes 44. It is provided with a connecting horizontal pipe 42 and a handle grip 30 provided at the upper end of the handle 12.

As shown in FIG. 8, the substantially cylindrical connecting horizontal pipe 42 has a hollow portion 43 therein. The hollow portion 43 accommodates a pair of left and right symmetrical lock pins 48 slidably around the axis. Each lock pin 48
Extend in the horizontal direction and are shorter than half the length of the connecting horizontal pipe 42. A compression spring 49, which is arranged in a compressed state, is arranged between the respective end faces on the axial center side of the left and right lock pins 48. Therefore, the two lock pins 48 can slide along the direction of the hollow portion 43 while being elastically biased toward the opposing handle support pipe 41. Openings 48b are formed at both ends of the hollow portion 43, and the corresponding lock pin 4 is opened through these openings 48b.
The tip end 48a of 8 can go in and out. Further, the tip portion 48a of the lock pin 48 protruding from the opening 48b
Is inserted into the handle positioning hole 48c.

The lock pin 48 has a tapered tip portion 48a on the corresponding handle support pipe 41 side, and
An operation knob 46 orthogonal to the lock pin 48 is provided on the symmetry axis side. The operation knob 46, that is, the slot 47 for restricting the slide amount of the lock pin 48 is connected to the horizontal pipe 42.
It is provided in.

In this way, the handle height adjusting mechanism 40
Is composed of left and right handle support pipes 41 in which positioning holes 48c are formed, a handle pipe 44 of the handle 12 slidable with respect to each handle support pipe 41, and a connecting horizontal pipe 42 having a lock pin 48. There is.

Next, the movement of the handle height adjusting mechanism 40 will be described with reference to FIGS.

2 to 4 are a front view, a rear view and a side view, respectively, showing a state in which the handle 12 is at the lowermost position. On the other hand, FIGS. 5 to 7 are a front view, a rear view, and a side view, respectively, showing a state in which the handle 12 is at the uppermost position. It goes without saying that the handle 12 can take an intermediate position between the lowermost position and the uppermost position.

The handle 12 locked at the lowermost position is
It can be locked at the uppermost position by the following procedure.

That is, in the handle 12 locked at the lowermost position, the tip portion 48a of the lock pin 48 is inserted into the handle positioning hole 48c through the opening 48b, and the handle 12 is locked to the handle support pipe 41. Has been done. In order to release the locked state, both of the operation knobs 46 are moved in the axial direction of symmetry along the connecting horizontal direction.
As a result, the tip portion 48a of the lock pin 48 has the opening 48b.
It exists inward, that is, in the direction of the axis of symmetry. Next, the handle 12 is moved to the approximate uppermost position while maintaining the state where both the left and right operation knobs 46 are brought close to each other in the symmetric axis direction. The handle 12 is slightly moved up and down in a state where both the left and right operation knobs 46 are not held in the symmetrical axis direction. When the tip end 48a of the lock pin 48 is aligned with the handle positioning hole 48c at the uppermost position,
The tip portion 48a is automatically pushed into the handle positioning hole 48c by the urging force of the compression spring 49. That is, the tip end 48a of the lock pin 48 is inserted into the handle positioning hole 48c through the opening 48b, and the handle 12 is locked at the uppermost position of each handle support pipe 41.

Similarly, the handle 12 locked at the uppermost position can be locked at the lowermost position.
The description is omitted.

Next, the seat height adjusting mechanism 50 for adjusting the height of the seat 60 of the seat 14 will be described.

The seat portion 60 of the stool seat 14 is inserted into the left and right seat portion support pipes 51, respectively, and the guide portion 54 is slidable, and the left and right guide portions 54 are connected to each other. And an integrated connection horizontal pipe 52.

As shown in FIG. 8, the substantially cylindrical connecting horizontal pipe 52 has a hollow portion 53 therein. In the hollow portion 53, a pair of left and right lock pins 58 which are symmetrical with respect to the axis of symmetry are slidably housed. Each lock pin 5
8 extends in the horizontal direction and is shorter than half the length of the connecting horizontal pipe 52. The compression springs 59 arranged in a compressed state are arranged between the respective end faces on the axial center side of the left and right lock pins 58. Therefore, the two lock pins 58 can slide along the direction of the hollow portion 53 while being elastically urged toward the seat supporting pipes 51 facing each other. Openings 58b are formed at both ends of the hollow portion 53, and the corresponding lock pins 58 are opened from these openings 58b.
The leading end 58a of the can be in and out. The tip 58a of the lock pin 58 protruding from the opening 58b is
It is inserted into the seat portion positioning hole 58c.

The lock pin 58 has a tapered tip portion 58a on the side of the corresponding seat portion support pipe 51, and an operation knob 56 orthogonal to the lock pin 58 on the symmetry axis side. A slot 57 for restricting the slide amount of the operation knob 56, that is, the lock pin 58 is provided in the connecting horizontal pipe 52.

As described above, the seat height adjusting mechanism 50 includes the left and right seat support pipes 51 in which the positioning holes 58c are formed.
And a guide portion 54 of the seat portion 60 of the seating seat 14 slidable with respect to each seat portion support pipe 51, and a connecting horizontal pipe 52 having a lock pin 58.

Next, the movement of the seat height adjusting mechanism 50 will be described with reference to FIGS.

2 to 4 respectively show a stool seat 14
It is a front view, a rear view, and a side view showing a state in which the seat portion 60 is at the uppermost position. On the other hand, FIGS.
It is a front view, a rear view, and a side view showing a state where a seat portion 60 of the stool seat 14 is at the lowermost position. Needless to say, the seat portion 60 of the seat 14 can take an intermediate position between the lowermost position and the uppermost position.

Stool seat 14 locked at the uppermost position
The seat portion 60 can be locked at the lowermost position by the following procedure.

That is, in the seat portion 60 of the seating seat 14 locked at the uppermost position, the tip portion 58a of the lock pin 58 has the seat portion positioning hole 58c through the opening 58b.
The seat 60 of the seat 14 is locked to the seat support pipe 51. In order to release the locked state, both of the operation knobs 56 are brought close to each other in the symmetrical axis direction along the connecting horizontal direction. As a result, the tip portion 58a of the lock pin 58 exists inside the opening 58b, that is, in the symmetric axis direction. Next, the seat portion 60 of the seated seat 14 is moved to the approximate lowest position while maintaining the state where both the left and right operation knobs 56 are brought close to each other in the symmetric axis direction. The seat portion 60 of the sitting seat 14 is slightly moved up and down in a state where both the left and right operation knobs 56 are not held in the symmetrical axis direction. When the tip portion 58a of the lock pin 58 is aligned with the seat portion positioning hole 58c at the lowermost position, the tip portion 58a is automatically pushed into the seat portion positioning hole 58c by the urging force of the compression spring 59. That is, the tip portion 58a of the lock pin 58 is inserted into the seat portion positioning hole 58c through the opening 58b, and the seat portion 6 of the seat 14 is seated.
0 is locked at the lowermost position of each seat support pipe 51.

Similarly, since the seat portion 60 of the stool seat 14 locked at the lowermost position can be locked at the uppermost position, the description thereof will be omitted.

In any of the above embodiments,
Although the compression spring 49 or 59 is arranged between the two lock pins 48 or 58,
The compression springs 49 or 59 may not be arranged between the eight. Further, the present invention is particularly effective when applied to the seat portion 60 of the stool seat 14 or the handle 12 in which the usability according to the height difference of the user is clear, but the pair of left and right support pipes 41 or The height adjusting mechanism according to the present invention can be applied to the backrest 64 of the seat 14 supported by 51, the shopping basket, and the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing a handcart including a height adjusting mechanism according to the present invention.

FIG. 2 is an enlarged front view of the hand cart shown in FIG. 1 in a state in which the handle is in the lowermost position and the seat is in the uppermost position.

FIG. 3 is a rear view of the handcart shown in FIG.

4 is a side view of the handcart shown in FIG. 2. FIG.

5 is an enlarged front view of the handcart shown in FIG. 1 in a state in which the handle is in the uppermost position and the seat is in the lowermost position.

FIG. 6 is a rear view of the handcart shown in FIG.

FIG. 7 is a side view of the handcart shown in FIG.

8 is a cross-sectional view of a main part of a height adjustment mechanism used in the handcart shown in FIG.

[Explanation of symbols]

1 wheelbarrow 10 frames 12 handles 14 stool sheet 15 front wheels 16 rear wheel 30 handle grip 40 Handle height adjustment mechanism 41,51 Support pipe 42,52 Connected horizontal pipe 43,53 hollow part 44 handle pipe 46,56 control knob 47,57 slots 48,58 Lock Pin 48a, 58a Tip 48b, 58b opening 48c, 58c Positioning hole 49, 59 compression springs 50 Seat height adjustment mechanism 54 Guide 60 seat 64 backrest

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3D050 AA03 DD01 EE15 GG03 KK15                 3D051 AA02 AA08 AA22 BA03 BB03                       BB19 BB27 BB39 CA05 CB02

Claims (3)

[Claims] 1. A handle is provided on an upper portion of a frame forming a skeleton of a vehicle body, and the frame includes a pair of parallel handle support pipes extending in a substantially vertical direction to support the handle, The handle is equipped with a pair of parallel handle pipes extending substantially downward from the left and right handle grips, and the lower end of each handle pipe is slidably fitted over the upper end of each handle support pipe. In a vehicle, a connecting horizontal pipe that connects the pair of handle pipes to each other so as to communicate with each other, a pair of left and right lock pins slidably accommodated in a hollow portion of the connecting horizontal pipe, and fixed to the lock pins. And an operating knob projecting outward from a slot formed in the axial direction at a predetermined position of the connecting horizontal pipe. A plurality of positioning holes that cooperate with the lock pins are formed in the vertical direction on the opposing surface side of the pipe, and the hollow portion of the connecting horizontal pipe and the hollow portion of the handle pipe communicate with each other, After adjusting the height position to the handle support pipe, operate each operation knob and insert the tip of each lock pin into the corresponding positioning hole of each handle support pipe to fix the handle to that support pipe The height adjustment mechanism of the handle characterized by doing so. 2. A seat portion of a stool seat is provided at a substantially central portion of a frame forming a skeleton of a vehicle body, and the frame comprises a pair of parallel sheets extending in a substantially vertical direction to support the seat portion. The seat part includes a seat support pipe, and the seat part includes a pair of parallel guide parts extending in a substantially vertical direction, and each guide part is slidably fitted on each seat part support pipe. In a wheelbarrow, a connecting horizontal pipe integrally connecting the pair of guide portions to each other so as to communicate with each other, a pair of left and right lock pins slidably accommodated in a hollow portion of the connecting horizontal pipe, and each of the lock pins. An operating knob that is fixed and protrudes outward from a slot formed in an axial direction at a predetermined position of the connecting horizontal pipe, and further, a plurality of cooperating with the lock pin on the facing surface side of each seat supporting pipe. Positioning hole It is formed in the vertical direction, and the hollow part of the connecting horizontal pipe and the hollow part of the guide part communicate with each other.Adjust the height position of the guide part with respect to the seat part support pipe, and then adjust each operation knob. The seat portion of the stool seat is fixed to the support pipe by inserting the tip of each lock pin into the corresponding positioning hole of each seat support pipe by operating the Adjustment mechanism. 3. A compression elastic member is disposed between the pair of left and right lock pins, and each lock pin is elastically biased toward the opposing support pipe. With the tip of each lock pin positioned in the corresponding positioning hole of each support pipe,
3. The height adjusting mechanism according to claim 1, wherein the tip end of each lock pin is inserted into the corresponding positioning hole of each support pipe by releasing the left and right operation knobs.