JP4940192B2 - One-handed wheelbarrow - Google Patents

Description

  The present invention relates to a one-handed handcart having a turning wheel structure.

Conventionally, one-handed wheelbarrows that are pushed with one hand and used as walking aids have a direct connection between the handle heel and the lower wheel, and when the one-handed wheel is pushed, the wheel is taken by the unevenness of the ground and goes straight. There was a problem that the wrist was easily tired. Further, as described in Patent Document 1, there is also known a structure in which a turnable wheel is used and this is attached to the lower end of the handle rod.
JP 2001-213325 A

  However, if the advanceability (straightness) is not fixed (that is, it is difficult to go straight) and the wheel that can turn freely stops in the left-right direction, the handcart tends to fall over. There was a problem of becoming.

  Therefore, an object of the present invention is to provide a one-handed handcart having a turning wheel structure that allows a user to easily and quickly switch the turning state of a wheel in accordance with a place of use, a traveling road condition, and the like. Another object of the present invention is to make it possible to easily repair and replace each component of the turning wheel structure that is turnable and that can be easily switched in a turning state.

  In order to achieve the above object, a one-handed handcart of the present invention can be inserted between a fixing member fixed to a lower end portion of a leg rod and having a pair of locking projections and a pair of the locking projections. A regulating member having a lever member, and the lever member is pivotally mounted so as to be swingable so as to cover the lever member and the pair of locking protrusions in a state where the lever member is inserted between the pair of locking protrusions. A support member having a lock cover member and a pair of left and right wheels, and a stopper member that prevents the restricting member and the support member from coming out downward.The restricting member and the support member are The upper and lower surfaces are opposed to each other so that relative rotation of 50 ° to 100 ° is possible around the axis of the lower end portion, and the restriction member, the support member, and the stopper member are sequentially attached to the lower end portion in an outer fitting shape. A turning wheel structure.

  The stopper member has a C-shaped sandwiching portion that is externally fitted to the leg rod so as to be elastically deformable, and a pin portion that protrudes from an inner surface of the sandwiching portion in a direction orthogonal to the axial center. Is inserted into a through hole provided in the lower end portion, and the holding portion is attached to the lower end portion by elastic force.

  According to the turning wheel structure of the one-handed handcart according to the present invention, it is easy to switch the wheel into three stages of the turning free state, the turning prohibited state, and the intermediate state between the turning free state and the turning prohibited state. Furthermore, the assembly of the components of the turning wheel structure and the repair / replacement are easy.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIG. 1 shows an embodiment of a one-handed wheelbarrow 14 having a turning wheel structure of the present invention.
In FIG. 1, a shopping cart 14 has a pipe-like leg 1 on the front (traveling direction) side and a leg member 11 on the rear side pivoted so as to be foldable in the front-rear direction. Further, a front loading platform 7 pivotally mounted on the leg rod 1 so as to swing up and down and a rear loading platform 8 pivotally mounted on the leg member 11 so as to be swingable up and down are guided so as to be able to approach and separate in the front-rear direction. It is connected via a shaft 9. A brake device (brake device) that stops the rear wheels 10 and 10 by operating a pair of left and right rear wheels 10 and 10 at the lower end of the leg member 11 and a brake lever member 13 attached to the upper end of the leg rod 1. ) 12. A turning wheel structure is provided on the front leg rod 1. An upper end portion of the leg rod 1 is a grip portion (grip portion) 18. A storage bag 19 (shown by a two-dot chain line) is provided on the front and rear cargo beds 7 and 8.

This turning wheel structure includes a fixing member 2 that is fixed to the lower end 1 a of the leg rod 1 and has a pair of locking protrusions 21 and 21.
There is provided a regulating member 3 which is externally fitted to the lower end portion 1a below the fixing member 2 and on which a lever member 30 which can be inserted between the pair of locking projections 21 and 21 is pivotally attached.
Further, the lever member 30 and the pair of locking protrusions are fitted to the lower end portion 1a below the regulating member 3 and the lever member 30 is inserted between the pair of locking protrusions 21 and 21. A support member 4 having a lever-like lock cover member 40 pivotably mounted so as to cover 21 and 21 is provided.
And the stopper member 5 which prevents the movement and omission of the control member 3 and the support member 4 below is provided.
In the present invention, the traveling direction is referred to as the front. Further, the direction will be described in the posture in which the horizontal rotation axis L ₂ of the wheel 6 shown in FIG. 1 is rearward of the axis L ₀ and goes straight forward.

FIG. 2 shows an exploded perspective view of the main part. FIG. 3 shows an enlarged view of the main part of FIG. 1, wherein (a) is a side view and (b) is a cross-sectional view taken along line AA of (a).
The fixing member 2 has a cylindrical portion 22 concentric with the lower end portion 1a. A pair of locking projections 21, 21 project from the cylindrical portion 22 forward. A fixing through hole 24 is formed on the rear side of the cylindrical portion 22. The fixing screw member 15 that can be inserted into the fixing through-hole 24 is screwed to the lower end portion 1a so as to be fixed to the outer fitting shape. A connecting portion 23 is formed on the rear side of the cylindrical portion 22 so as to pivotally mount the front loading platform 7 on which a load or the like can be loaded so as to be swingable around the first horizontal axis L ₁ .

  The regulating member 3 has a short cylindrical portion 32 concentric with the lower end portion 1a. A pair of holding pieces 31, 31 project from the outer peripheral surface of the short cylindrical portion 32 forward (in the same direction as the locking projection piece 21). A lever member 30 that is swingable in the vertical direction is pivotally mounted between the pair of holding pieces 31. The lever member 30 is an elastically deformable bulging portion that approaches the outer peripheral surface of the short cylindrical portion 32 as it swings upward to a position where it is inserted between the pair of locking projections 21, 21 of the fixing member 2. 30a.

  FIG. 4 shows a state in which the lever member 30 is inserted between the pair of locking protrusions 21 (hereinafter also referred to as a first locked state). The bulging portion 30 a is in contact with the outer peripheral surface of the short cylindrical portion 32 and holds the upper position of the lever member 30. That is, the first lock state is maintained.

In the first locked state, the restricting member 3 is connected to the fixing member 2 and is in a rotation prohibited state in which the restricting member 3 is fixed to the leg rod 1. When the lever member 30 is not inserted into the pair of locking protrusions 21 (hereinafter also referred to as a first unlocked state), the lever member 30 is in a freely rotating state that can rotate about the axis L ₀ .

The support member 4 has a cylindrical part 42 concentric with the lower end part 1a. A pair of support pieces 41 and 41 project from the outer peripheral surface of the cylindrical portion 42 to the front. A lock cover member 40 is pivotally mounted so as to be swingable in the vertical direction so as to sandwich the pair of support pieces 41 from the outside. In addition, a wheel support portion 43 that protrudes from the cylinder portion 42 to the left and right rear is formed. The wheel support portion 43, are pivotally attached rotatably a pair of right and left wheels 6 and 6 horizontally axis of rotation L ₂ around.

The lock cover member 40 is always elastically urged so as to be drawn toward the cylindrical portion 42 by a locking elastic urging member 44 having one end attached to the cylindrical portion 42. It is formed so as to cover the lever member 30 and the pair of locking projections 21, 21 in the first locked state, and the covered state is provided so as to be held by the locking bullet urging member 44.
FIG. 5 shows a state in which the lever member 30 and the pair of locking protrusions 21 and 21 in the first locked state are covered (hereinafter also referred to as a second locked state). FIGS. 1 and 3 to 5 are side views of the main part in a state in which one of the pair of left and right wheels 6 and 6 is removed for easy explanation.

The support member 4 is connected to the fixing member 2 and the regulating member 3 and fixed to the leg rod 1 in the second locked state, and cannot rotate about the axis L ₀ , so that the pair of wheels 6, 6 A turning prohibited state in which turning about the axis L ₀ is prohibited is obtained. Further, in the first unlocked state, the turning free state in which the pair of wheels 6 and 6 can turn about the axis L ₀ is set.

Here, the regulating member 3 and the support member 4 face each other up and down so as to be relatively rotatable between 50 ° and 100 ° around the axis L ₀ .
In FIG. 3, the restricting member 3 forms a downward projecting contact portion 33 that enters the notch recess 45. The support member 4 is formed with a notch recess 45 having an upper opening and a predetermined angle θ in the circumferential direction on the upper surface side. When the abutting portion 33 of the regulating member 3 abuts on the one inner side surface 45a of the supporting member 4 to the other inner side surface 45a, the relative rotation of the regulating member 3 and the supporting member 4 is 50 °. The predetermined angle θ is set to be ˜100 °. It is also preferable to provide relative rotation at 75 ° to 95 °.

In a state where the lock cover member 40 does not cover the lever member 30 and the pair of locking protrusions 21 and 21 in the first locked state (hereinafter also referred to as a second unlocked state) and in the first locked state, the regulating member 3 Is in a rotation prohibited state. The support member 4 is in a state of being rotatable around the axis L ₀ . When the support member 4 rotates in the second unlocked state (the state shown in FIG. 4), the abutment portion 33 of the regulating member 3 abuts on one of the inner side surfaces 45a and 45a in the circumferential direction of the notch recess 45 and is supported. The rotation of the member 4 is restricted.

That is, in the first locked state and the second unlocked state, the restricting member 3 that is connected to the fixing member 2 and is in a rotation-inhibited state causes the rotation of the support member 4 about the axis L ₀ to be 50 ° to 100 °. It regulates so that. In other words, a turning restriction state (which can be said to be an intermediate state between the turning free state and the turning prohibited state) in which the turning (oscillation) of the wheel 6 is restricted is obtained.

Here, when the relative rotation is set to 50 ° or less, the turning of the wheel 6 becomes small, and the effect of turning (ease of turning and escape from obstacles such as pebbles) cannot be obtained, and the turning prohibited state The change (difference) in the effect of cannot be obtained. On the other hand, if the angle is larger than 100 °, there is an increased possibility that the rotation axis L ₂ of the wheel 6 is regulated toward the traveling direction, and the cause of tripping the user is increased.

  Further, the circumferential position where the abutment portion 33 of the regulating member 3 is the center position (bisected position) of the notch recess 45 at a predetermined angle θ, the lock cover member 40 is the lever member 30 and the pair of locking protrusions 21. , 21 is provided with a regulating member 3 and a support member 4 that are arranged so as to substantially coincide with the circumferential position that can be covered. The regulating member 3 and the support member 4 are connected via a connecting bullet urging member 46. The connecting bullet urging member 46 always urges and urges the contact portion 33 so that the notch recess 45 is at the center position of the predetermined angle θ. In other words, in the first locked state, the lock cover member 40 can be easily covered by the lock cover member 40 without positioning the lock cover member 40 in the circumferential direction. The bullet is energized.

At a 2 and 3, the stopper member 5 has a lower end 1a and the concentric holding portion 50 made of C-shaped resin, projecting from the inner surface 50a of the clamping portion 50 in the direction perpendicular to the axis L ₀ A metal pin 51 is integrally formed. The clamping part 50 is externally fitted to the lower end part 1a so as to be elastically deformable. Inflated portions 52, 52 that slightly expand both ends of the C-shaped circumferential opening to improve the clamping force are formed. The pin portion 51 is inserted into a through hole 1 b provided in the lower end portion 1 a of the leg rod 1. The pin portion 51 is inserted into the through-hole 1b and attached to the lower end portion 1b by the elastic force of the holding portion 50.

  The regulating member 3, the supporting member 4 and the stopper member 5 are sequentially attached to the lower end 1 a of the leg rod 1 in an outer fitting manner, and a load is applied below the regulating member 3 and the supporting member 4. 4 is received in contact with the pin 4 and supported by the leg pad 1 via the pin portion 51.

The use method (action) of the above-described turning wheel structure of the present invention will be described.
When the lever member 30 is swung to the first unlocked state (the state shown in FIG. 3), the regulating member 3 and the support member 4 can freely rotate 360 ° around the axis L ₀ . The pair of left and right wheels 6 and 6 are in a freely turning state in which they can turn around the axis L ₀ . In the freely turning state, when the inner side surface 45 a of the notch recess 45 of the support member 4 contacts the contact portion 33, the regulating member 3 rotates together with the support member 4.

When the lever member 30 is in the first locked state (the state shown in FIG. 4), the regulating member 3 is connected to the fixing member 2 via the lever member 30. The regulating member 3 cannot rotate around the axis L ₀ . When the support member 4 tries to rotate around the axis L ₀ , the inner surface 45 a of the notch recess 45 abuts against the abutting portion 33 of the fixed regulating member 3, and the rotation is regulated. The support member 4 is in a state where relative rotation of 50 ° to 100 ° is possible around the axis L _{0 with} respect to the regulating member 3. A pair of wheels 6 and 6 will be in the turning regulation state which turns within the range in which relative rotation of support member 4 is possible.

  In the turning restricted state, even if the wheel 6 comes into contact with an obstacle such as a pebble on the road surface, the wheel 6 is turned within the restricted range to prevent the user from tripping. It also makes it easier to turn right and left. Further, even if the obstacle contacts with the obstacle and turns (swings) against the user's intention, the connecting bullet urging member 46 changes the direction of the support member 4 in the forward direction (the same direction as the regulating member 3). return.

In the second locked state (the state shown in FIG. 5), the support member 4 is connected to the fixing member 2 via the lock cover member 40. The support member 4 cannot rotate about the axis L ₀ . The pair of wheels 6 and 6 are unable to turn and are in a turn prohibited state. The pair of wheels 6 and 6 always rotate in the forward direction, and stabilize straight traveling.

  That is, by operating the lever member 30 and the lock cover member 40, the wheel 6 is switched to a turning state according to the user's preference, in a turning free state, a turning restricted state (intermediate state), and a turning prohibited state.

And the stopper member 5 is removed when replacing | exchanging the wheel 6 or performing a maintenance. That is, by pulling the clamping portion 50 so as to pull the pin 51 from the through-hole 1b of the lower end portion 1a in the direction perpendicular to the axis L _0, are easily removed without the use of tools. The support member 4 and the regulating member 3, since only are fitted to the lower end 1a, pulled out in the axial L ₀ direction (downward). The support member 4 and the regulating member 3 are easily separated from the leg rod 1 and the cargo bed portion (the front cargo bed 7 and the rear cargo bed 8).

There is no need to hold the wheelbarrow 14 as a whole with a large jig or tool so that it can be moved or laid down, and the wheels 6 and 6 can be replaced simply by holding the support member 4 which is a small component compared to the whole. Enable. In addition, the lever member 30 and the lock cover member 40 that are frequently swung and may be replaced or inspected are easily disassembled.
After the replacement of the wheel 6 or after the maintenance is completed, the support member 4 and the regulating member 3 can be easily assembled only by the stopper member 5 without using a tool.

  In the present invention, the design can be changed. For example, a notch recess 45 is formed in the restricting member 3 and a contact portion 33 is formed in the support member 4 so as to restrict the turning of the wheel 6. good.

As described above, the present invention can be inserted between the fixing member 2 fixed to the lower end portion 1 a of the leg rod 1 and having the pair of locking projections 21, 21 and the pair of locking projections 21, 21. The regulating member 3 having a lever member 30 and the lever member 30 so as to cover the lever member 30 and the pair of locking projections 21 and 21 in a state where the lever member 30 is inserted between the pair of locking projections 21 and 21. A support member 4 having a lock cover member 40 pivotally attached to the rocker and a pair of left and right wheels 6, 6, and a stopper member 5 that prevents the regulating member 3 and the support member 4 from coming out downward. Furthermore, the regulating member 3 and the supporting member 4 face each other up and down so that they can be rotated relative to each other by 50 ° to 100 ° around the axis L _{0 of} the lower end portion 1a. 4 and the stopper member 5 are sequentially fitted in an outer fitting shape so that the wheels 6 and 6 are in a freely turning state. A turn restriction state, the turning inhibition state can be switched to three stages. Therefore, the most preferable turning state can be selected from among the three states corresponding to the user's preference and body condition, and further corresponding to the place of use and the traveling road state. Moreover, this selection (switching) can be performed easily and simply. In addition, when the vehicle is stopped, it is possible to make a turn prohibited state by a simple operation so that the vehicle does not fall sideways. While the turning state of the wheel 6 can be switched in three stages, the support member 4 having the wheel 6 can be easily detached so as to be pulled out below the leg rod 1. The support member 4 can be easily separated from the members such as the cargo bed portion (the front cargo bed 7 and the rear cargo bed 8) that are not related to the exchange of the wheels 6 and 6, and the wheels 6 and 6 can be easily exchanged. The restriction member 3, the support member 4, and the stopper member 5 can be easily assembled, and the repair and replacement of the component parts can be easily performed.

Further, the stopper member 5 is closed and a pin portion 51 projecting from the inner surface 50a of該挟sandwiching member 50 in the direction perpendicular to the C-shaped clamping portion 50 and the axis L ₀ of fitted freely elastically deformed Ashi杆1 Since the pin portion 51 is inserted into the through hole 1b penetrating the lower end portion 1a and the holding portion 50 is attached to the lower end portion 1a by the elastic force, the pin portion 51 is attached to the lower side of the regulating member 3 and the support member 4. It can be prevented from coming off. The restriction member 3 and the support member 4 can be easily attached to and detached from the leg rod 1 without using a tool such as a spanner or a screwdriver. It is possible to prevent the regulating member 3 and the support member 4 from falling off simply by forming the through hole 1b in the leg rod 1.

It is a side view which shows one Embodiment. It is a disassembled perspective view. It is a figure for principal part description, (a) is a principal part side view, (b) is AA sectional drawing of (a). It is a figure explaining a 1st locked state, (a) is a principal part side view, (b) is BB sectional drawing of (a). It is a figure explaining a 2nd locked state, (a) is a principal part side view, (b) is CC sectional drawing of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Leg rod 1a Lower end part 1b Through-hole 2 Fixing member 3 Control member 4 Support member 5 Stopper member 6 Wheel
21 Locking protrusion
30 Lever member
40 Lock cover member
50 Nipping part
50a inside
51 Pin part L ₀ axis

Claims (2)

Between the fixing member (2) having a pair of locking projections (21) (21) fixed to the lower end (1a) of the leg rod (1) and the pair of locking projections (21) (21) The regulating member (3) having a lever member (30) that can be inserted into the lever, and the lever member (30) being inserted between the pair of locking protrusions (21) (21) A lock cover member (40) pivotably mounted so as to cover the member (30) and the pair of locking protrusions (21) (21) and a pair of left and right wheels (6) (6). A support member (4), a regulating member (3), and a stopper member (5) for preventing the support member (4) from coming out downward,
Further, the regulating member (3) and the support member (4) face each other up and down so that they can be relatively rotated by 50 ° to 100 ° around the axis (L ₀ ) of the lower end portion (1a), and The lower end (1a) is provided with a turning wheel structure in which the regulating member (3), the supporting member (4), and the stopper member (5) are sequentially attached in an outer fitting shape. One-handed wheelbarrow. The stopper member (5) includes a C-shaped sandwiching portion (50) that is externally fitted to the leg rod (1) so as to be elastically deformable, and the sandwiching portion (50) in a direction perpendicular to the axis (L ₀ ). A pin portion (51) protruding from the inner surface (50a), and the pin portion (51) is inserted into a through-hole (1b) penetrating the lower end portion (1a) and the holding portion (50) is The one-handed handcart according to claim 1, wherein the handcart is attached to the lower end (1a) by elastic force.

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