JP2015051696A - Height adjustment mechanism of handcart handle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a height adjustment mechanism of handcart handle in which the handle does not drop due to unintended operation of a control lever, and a member does not project excessively toward outside to be an obstacle, and high robustness can be secured.SOLUTION: A cover body rotation shaft 30 is disposed on a control lever 14 capable of rotating between a pipe fix position L and a pipe movable position U, and a cover body 18 rotating around a shaft, with the cover body rotation shaft 30 serving as the shaft, is attached thereto. The cover body 18 can be moved between a safe lock release position α where the control lever 14 can rotate to the pipe movable position U, and a safe lock position β where rotation of the control lever 14 to the pipe movable position U is inhibited.

Description

  The present invention relates to a handle height adjustment mechanism for a wheelbarrow such as a walking assistance vehicle, a care wheelchair, a silver car, or a baby carriage.

  When moving the wheelbarrow as described above, the user holds the handle and pushes it forward. For example, in the case of a walking assistance vehicle 100 as shown in FIG. 10, the height of the handle is adjusted to the physique of the user. A height adjustment mechanism 101 that can be adjusted is provided. Specifically, the height adjusting mechanism 101 is provided at a portion where the nested handle post 103 and the handle pipe 108 are assembled.

  Further, for example, in Patent Document 1, a pin is attached to a lever pivotally attached to a housing attached to an outer tube, and the spring biasing force is assumed to adjust the height of the handle by a nested inner tube and an outer tube. A structure has been proposed in which the height of the handle is fixed while the pin is inserted into the locking hole of the inner tube. And when adjusting the height of a handle, a lever is rotated, a pin is pulled out from a locking hole, and a handle is moved up and down.

  However, in the mechanism proposed in Patent Document 1, since the lever is exposed to the outside, a part of the user's body is abruptly touched to the lever, and the lever is unlocked. Could fall suddenly.

  As means for solving the above problems, for example, a configuration as disclosed in Patent Document 2 is proposed. That is, a cover case that covers a seesaw lever pivoted on a handle is provided, and the cover case prevents the seesaw lever pin from moving freely to stabilize the handle and prevent an unexpected operation of the seesaw lever. It is.

Japanese Patent No. 4095377 Utility Model Registration No. 3003369

  However, when a cover case as proposed in Patent Document 2 is applied, the cover case has a structure that protrudes outward with respect to the seesaw lever at the time of release, so that the cover case protruding excessively becomes an obstacle. was there. Also, due to the structure, the strength of the hinge part of the cover case is extremely low, and when the arm is caught on the cover case when released and a downward force is applied to the cover case, the hinge part of the cover case can be easily There was a risk of damage. Further, repeated use may cause wear of the protruding piece that presses the seesaw lever, resulting in a problem in operation.

  Therefore, the present invention can adjust the height of the handle with a simple configuration, can prevent the operation lever from being unlocked due to an unexpected operation as described above, and further adjusts the height of the handle. It is an object of the present invention to provide a height adjustment mechanism for a wheelbarrow handle in which a member does not excessively protrude outward.

  In the present invention, a handle pipe having a handle on an upper portion and a handle post supporting the handle pipe are assembled in a nested manner, and the height of the handle is increased by changing a distance between the handle pipe and the handle post. An adjustment mechanism for the height of the handle for a handcart that can be adjusted, the operation lever support member being fixed to the outer side of the handle pipe and the handle post, and the operation lever support member An operation lever that is rotatably attached via a rotation shaft, and when the operation lever rotates to one side and is positioned at a predetermined pipe fixing position, the handle pipe is fixed to the handle post. When the operating lever rotates to the other side and is positioned at a predetermined pipe movable position, the handle pad is moved with respect to the handle post. And a pipe fixing mechanism part that enables movement of the pipe. A pressing part is provided at one end of the operating lever, and the operating lever is moved from the pipe fixing position by pressing the pressing part. The pipe is moved to the movable position, and the other end portion of the operation lever or the operation lever support member is provided with a cover body rotation shaft that protrudes in a direction opposite to the pressing direction of the pressing portion of the operation lever. The cover body rotating shaft is attached with a cover body that is rotatable around the axis of the cover body rotating shaft, and the cover body rotates about the axis of the cover body rotating shaft. Thus, the position can be changed between a safety lock position covering the pressing portion and a safety lock releasing position not covering the pressing portion, and a fixing means for fixing the cover body to the safety lock position. The cover body is provided with the safety lock. The operation lever is inoperable when fixed to a position, and the operation lever can be operated when the cover body is positioned at a safety unlocking position. This is a handle height adjustment mechanism.

  As a basic structure of the above configuration, when the operation lever is rotated to the pipe movable position, the height of the handle can be adjusted. On the other hand, when the operation lever is rotated to the pipe fixing position, the handle is fixed. Further, as a structure unique to the present invention, when the cover body is positioned at the safety lock position in a state where the operation lever is positioned at the pipe fixing position, the pressing portion is covered, and the operation lever moves toward the pipe movable position. Rotation is restricted. In this way, by attaching the cover body so as to be rotatable around the axis of the cover body rotation shaft of the operation lever, the cover body as a covering member does not protrude excessively to the outside and can be operated. Space saving around the lever can also be achieved. Further, the cover body protruding excessively is not unintentionally hit with a hand and the hinge portion or the like is not damaged, and high robustness is ensured.

  The fixing means includes a concave portion provided on one of the surface of the operation lever support member and the surface of the cover body and a convex portion provided on the other, and the concave portion and the convex It is desirable that the cover body is restricted from moving in at least the pressing portion in the pressing direction by being engaged with the portion, and is fixed to the safety lock position.

  By setting it as this structure, the said cover body can be fixed to a safe lock position by simple operation which only engages this recessed part and this convex part. The concave portion may have a hollow shape, a through-hole shape, or a partially cutout hole shape as long as the convex portion is engaged with the concave portion.

  Further, in the fixing means, one of the convex portion and the concave portion is provided on an upper portion of the operation lever support member, and the other of the convex portion and the concave portion is provided on one end portion of the cover body. Further, the cover body is provided with a long hole-like insertion hole through which the cover body rotation shaft is inserted, and the cover body moves relative to the cover body rotation shaft, thereby A configuration is proposed in which the position is changed between the safety lock position where the concave portion and the convex portion are engaged and the safety lock release position where the concave portion and the convex portion are not engaged.

  By adopting such a configuration, for example, the cover body can be fixed to the safety lock position only by hooking the concave portion of the cover body onto the convex portion of the operation lever support member. Further, by relatively moving the cover body rotation shaft in the long hole-shaped insertion hole, the cover body can be appropriately moved within the desired movement range with respect to the cover body rotation shaft, thereby It is possible to engage and release the concave portion and the convex portion. When the concave portion and the convex portion are engaged, the cover body is suspended from the operation lever support member, and the engagement between the concave portion and the convex portion is stabilized by the weight of the cover body. Will be held.

  The height adjustment mechanism for the handcart handle of the present invention can surely suppress the unexpected operation of the operation lever, and further, when adjusting the height of the handle, the member does not protrude excessively outside, Since there is no hindrance during operation and the possibility of breakage can be suppressed, there is an effect that high robustness can be secured.

It is a perspective view of the height adjustment mechanism of the handle for handcarts concerning Example 1. FIG. The operation lever support member is shown, (a) is a perspective view, (b) is a longitudinal cross-sectional view. The operation lever is shown, (a) is a perspective view which shows the front side, (b) is a perspective view which shows the back side. The cover body is shown, (a) is a perspective view which shows the front side, (b) is a perspective view which shows a back side. It is a perspective view which shows a lock pin. (A) is a perspective view which shows the state which has an operation lever in a pipe fixing position, and a cover body exists in a safe lock release position, (b) is a longitudinal cross-sectional view which shows the state. (A) is a perspective view which shows the state which has an operation lever in a pipe movable position, and a cover body exists in a safe lock release position, (b) is a longitudinal cross-sectional view which shows the state. (A) is a perspective view which shows the state which has an operation lever in a pipe fixing position, and a cover body exists in a safety lock position, (b) is a longitudinal cross-sectional view which shows the state. It is explanatory drawing which decomposes | disassembles and shows the height adjustment mechanism of the handle for handcarts concerning Example 2. FIG. It is a perspective view of the conventional walking auxiliary vehicle.

  Hereinafter, the embodiment which actualized the height adjustment mechanism of the handle for handcarts of the present invention is described in detail. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

[Example 1]
A height adjustment mechanism 1A (hereinafter also referred to as “height adjustment mechanism 1A”) of a handcart handle according to this embodiment will be described with reference to the accompanying drawings.

  As shown in FIG. 1, a plurality of adjustment holes 9 for height adjustment are provided along the vertical direction at predetermined intervals in the handle post 3 provided in the walking assist vehicle as a handcart. An operation lever support member 7 is externally fitted and fixed to the lower end portion of the outer handle pipe 8 that is telescopically connected to the handle post 3. More specifically, as shown in FIG. 2, the operation lever support member 7 includes a fitting groove 7 a disposed relatively on the outside, and a penetrating insertion hole 7 b disposed relatively on the inside. Is provided. The fitting groove 7a is opened only upward, and the lower end of the handle pipe 8 is inserted and fitted. On the other hand, the insertion hole 7b penetrates in the vertical direction, and the handle post 3 is inserted from below.

  As shown in FIG. 2, an operation lever mounting recess 15 is formed on the rear surface (the surface facing the user) of the operation lever support member 7, and the operation lever 14 is provided in the operation lever mounting recess 15. (See FIG. 6 and the like). The operation lever mounting recess 15 is formed with an annular peripheral portion 15A surrounding the operation lever 14 in an annular shape. Further, a convex portion 7d is erected upward at the upper end portion of the peripheral portion 15A. Further, the operation lever mounting recess 15 is provided with a pair of left and right mounting holes 13 and 13 opened in the left-right direction. A rotation shaft 12 as a shaft member is inserted into the mounting hole 13 (see FIG. 1), and the operation lever 14 is rotatable with respect to the operation lever support member 7 through the rotation shaft 12. It is attached. Further, a through-hole 7c opened in the front-rear direction is disposed below the attachment holes 13 and 13. The lock pin 21 shown in FIG. 5 is inserted into the through hole 7c (see FIG. 6b).

  Further, as shown in FIG. 6b and the like, a coil spring 16 oriented in the front-rear direction is attached between the upper end portion of the operation lever 14 and the operation lever support member 7, and the operation lever 14 is pivotally supported. Is biased in a direction to be separated from the operation lever support member 7.

  As shown in FIG. 5, the lock pin 21 has an attachment shaft 21 a attached to the operation lever 14, and the attachment shaft 21 a is inserted into the lock pin attachment shaft hole 22 as shown in FIG. 6 b and the like. Has been inserted. Then, the distal end portion 21c of the lock pin 21 is inserted into the adjustment hole 9 of the handle pipe 8, whereby the handle post 3 and the handle pipe 8 are fixed, and the handle pipe 8 cannot be relatively moved. The pipe fixing mechanism 33 is constituted by a fixing mechanism including the adjustment hole 9 of the handle pipe 8 and the lock pin 21. Further, the height adjusting mechanism 1 </ b> A in the present embodiment is configured by the operation lever support member 7, the operation lever 14, and the pipe fixing mechanism portion 33 described above.

Next, the detailed structure of the operation lever 14 will be described with reference to the accompanying drawings.
As shown in FIG. 3, the operating lever 14 has a mounting hole 20 into which the rotating shaft 12 to be mounted on the operating lever support member 7 is inserted, and a lock pin mounting to which the mounting shaft 21 a of the lock pin 21 is mounted. A shaft hole 22 is provided. In addition, a pressing portion 28 is provided at one end portion 27 which is on the surface side (surface facing the user side) of the operation lever 14 and which is an upper portion with respect to the mounting position of the rotating shaft 12. On the other hand, the lower end portion 29 is provided with a cover body rotation shaft 30 that protrudes toward the user side, that is, in a direction opposite to the pressing direction of the pressing portion 28. The cover body rotation shaft 30 is provided with a step portion 30a having a large diameter on the base end side.

  Further, a cover body 18 as shown in FIG. 4 is attached to the cover body rotation shaft 30. More specifically, the cover body 18 has a lid shape that can substantially cover the peripheral edge portion 15A of the operation lever support member 7, and a peripheral wall 18a is erected on the peripheral edge. Further, one end which is the upper end of the peripheral wall 18a is set to have a wall height higher than that of the other part, and a through-hole-shaped recess 18b is provided in this part. Further, an approximately through-hole 18c having a long hole shape through which the cover body rotation shaft 30 of the operation lever 14 is inserted is provided at substantially the center of the cover body 18. The diameter of the through-hole 18c in the short direction is smaller than the diameter of the step portion 30a of the cover body rotation shaft 30, and the cover body 18 is prevented from excessively approaching the operation lever 14 side. Has been.

  As shown in FIG. 1 etc., the cover body rotating shaft 30 is inserted into the through hole 18c, and the cover body 18 cannot be removed from the cover body rotating shaft 30 by a flat washer and a screw. The cover body rotating shaft 30 is pivotally attached around the axis.

Next, an operation mode of the height adjusting mechanism 1A will be described with reference to FIGS.
As shown in FIG. 6, in the height adjusting mechanism 1 </ b> A, the operation lever 14 rotates to one side (downward) according to the biasing force of the coil spring 16 and is positioned at the pipe fixing position L in the normal state. . By being arranged at such a pipe fixing position L, the distal end portion 21c of the lock pin 21 is inserted into a desired adjustment hole 9 of the handle pipe 8, and the handle pipe 8 is fixed to the handle post 3. Is done.

  In the state shown in FIG. 6, the cover body 18 is located at a safety lock release position α at which the pressing portion 28 of the operation lever 14 is exposed.

  Then, as shown in FIG. 7, the operation lever 14 is rotated to the other side (upper side) while pushing the pressing portion 28 of the operation lever 14 against the urging force of the coil spring 16, and is moved to the pipe movable position U. When positioned, the distal end portion 21c of the lock pin 21 is extracted from the adjustment hole 9 of the handle pipe 8, and the distance between the handle pipe 8 and the handle post 3 is changed to be provided in the handle pipe 8. The height of the handle can be adjusted.

  On the other hand, as shown in FIG. 8, in the state where the operation lever 14 is located at the pipe fixing position L, the cover body 18 is rotated about the cover body rotation shaft 30, and the operation lever support member 7 is rotated. If the cover body 18 is hooked on the operating lever support member 7 by engaging the convex portion 7d of the cover body 18 with the concave portion 18b of the cover body 18, the cover body 18 is positioned at the safety lock position β that covers the pressing portion 28. Become. In this state, as shown in FIG. 8 b, the operation lever 14 is covered with the cover body 18, so that the pressing portion 28 cannot be pressed. More specifically, since the convex portion 7d and the concave portion 18b are engaged with each other and the step portion 30a of the cover body rotating shaft 30 restricts the movement of the cover body 18 to the front side, the cover body 18 Even when an external force in the pressing direction is applied to the cover body 18, the cover body 18 is held at that position, and the operation lever 14 is not pressed together with the cover body 18. In addition, the fixing means according to the present invention is configured by the convex portion 7d and the concave portion 18b.

  When the cover body 18 is set to the safety lock release position α, the cover body 18 is lifted once to release the engagement between the convex portion 7d and the concave portion 18b, and then the cover body rotating shaft 30 is moved. The axis may be reversed. The cover body 18 can be lifted to release the engagement between the convex portion 7d and the concave portion 18b because the through hole 18c is a long hole. Further, since the cover body 18 is attached to the cover body rotating shaft 30 without falling off, there is no risk of loss.

  Note that the height adjusting mechanism 1A of the present embodiment rotates the cover body 18 about the axis about the cover body rotation shaft 30 so that the cover body 18 is secured to the safety lock position β and the safety lock. Since it is a structure that moves between the release position α and the cover body 18, the cover body rotating shaft 30 remains protruding within the substantially thickness range of the cover body 18. For this reason, the component of the height adjusting mechanism 1A does not protrude excessively to the outside (for example, the user side), does not get in the way, and space saving around the operation lever 14 can be achieved. Furthermore, since the convex portion 7d is provided at the upper end of the operation lever support member 7, when the cover body 18 is suspended from the operation lever support member 7 to be in the safety lock position β, the weight is stabilized at the position by its own weight. Held. For this reason, in the safety lock position β, the operation lever 14 is not intended to move to the pipe movable position U unintentionally.

[Example 2]
In addition, it is good also as a height adjustment mechanism 1B as shown in FIG. That is, a leaf spring 50a bent in a substantially U-shape is attached to the back surface of the cover body 50, and on the other hand, an inclined portion 40a that can come into contact with the leaf spring 50a around the cover body rotation shaft 30 in the operation lever 40. A configuration is proposed. In such a configuration, when the cover body 50 is positioned at the safety lock position β, the cover body 50 is stably in this position with the leaf spring 50a and the inclined portion 40a being in non-contact with each other. When the cover body 50 is rotated to the safety unlocking position α with respect to this, the leaf spring 50a and the inclined portion 40a interfere with each other, and the leaf spring 50a is elastically compressed, and the leaf spring 50a. The cover body 50a is fixed at the safety unlock position α by the mutual friction between the inclined portion 40a and the inclined portion 40a. In this manner, the plate spring 50a and the inclined portion 40a for fixing the cover body 50 to the safety lock position β constitutes a fixing means according to the present invention.

  The present invention is not limited to the configurations of the first and second embodiments. For example, the handle post 3 may be an outer tube, and the handle pipe 8 may be an inner tube that is inserted into the handle post 3. Moreover, the surface of the pressing part 28 in the operation levers 14 and 40 may be a smooth shape, or may be provided with a raised part or unevenness so that the finger does not slip. Moreover, the said convex part 7d and the recessed part 18b in Example 1 are not limited to the said shape, Other shapes may be sufficient as long as the movement of the cover body 18 can be controlled appropriately by engaging with each other. Absent. Further, the cover body rotation shaft 30 does not need to be disposed on the operation levers 14 and 50 themselves, and may be disposed on the operation lever support member 7, for example.

1A, 1B Wheelbarrow handle height adjustment mechanism 3 Handle post 7 Operation lever support member 7d Convex part (fixing means)
8 Handle pipe 12 Rotating shaft 14, 40 Operation lever 18, 50 Cover body 18c Insertion hole 18b Recess (fixing means)
27 One end portion 28 Press portion 29 Other end portion 30 Cover body rotating shaft 33 Pipe fixing mechanism portion 40a Inclined portion (fixing means)
50a Leaf spring (fixing means)
L Pipe fixing position U Pipe movable position α Safety lock release position β Safety lock position

Claims (3)

A handle pipe having a handle on the upper part and a handle post supporting the handle pipe are assembled in a nested manner, and the height of the handle can be adjusted by changing the distance between the handle pipe and the handle post. A height adjustment mechanism for a wheelbarrow handle,
An operation lever support member fixed to the outer side of the handle pipe and the handle post; and
An operation lever rotatably attached to the operation lever support member via a rotation shaft;
When the operation lever rotates to one side and is positioned at a predetermined pipe fixing position, the handle pipe is fixed to the handle post, and the operation lever is rotated to the other side to reach a predetermined pipe movable position. A pipe fixing mechanism that allows the handle pipe to move relative to the handle post;
With
A pressing portion is provided at one end of the operating lever, and by pressing the pressing portion, the operating lever rotates from the pipe fixing position to the pipe movable position,
The other end portion of the operation lever or the operation lever support member is provided with a cover body rotation shaft that protrudes in a direction opposite to the pressing direction of the pressing portion of the operation lever.
A cover body that is rotatable around the cover body rotation axis is attached to the cover body rotation shaft, and the cover body rotates about the axis of the cover body rotation axis. The position can be converted between a safety lock position that covers the pressing portion and a safety lock release position that does not cover the pressing portion,
Furthermore, a fixing means for fixing the cover body to the safety lock position is provided,
When the cover body is fixed at the safety lock position, the operation lever cannot be operated, and when the cover body is located at the safety lock release position, the operation lever can be operated. A mechanism for adjusting the height of the handle for wheelbarrows. The fixing means includes a concave portion provided on one of the surface of the operation lever support member and the surface of the cover body, and a convex portion provided on the other,
The handcart handle according to claim 1, wherein the cover body is restricted from moving in the pressing direction at least in the pressing portion by being engaged with the concave portion and the convex portion, and is fixed at the safety lock position. Height adjustment mechanism. In the fixing means,
One of the convex portion and the concave portion is provided on an upper portion of the operation lever support member,
The other of the convex portion and the concave portion is provided at one end of the cover body,
Further, the cover body is provided with an elongated insertion hole through which the cover body rotation shaft is inserted,
The cover body moves relative to the cover body rotation shaft, whereby the safety lock position where the concave portion and the convex portion are engaged, and the safety where the concave portion and the convex portion are not engaged. The height adjusting mechanism of the handle for a handcart according to claim 2, wherein the position of the handle is changed between the unlocked position and the unlocked position.

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