JP2921921B2 - Small truck - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a small carrier having a rotating frame.

[Conventional technology]

Carrying heavy luggage through narrow alleys and climbing slopes requires more labor than necessary, so they are carried on vehicles with self-propelled functions. Therefore, such vehicles need to be small and weighed, but if they are too small, the center of gravity moment on the load side will be larger than the main body side moment when loading from the front. There is a problem that the department cannot be packed because it moves forward. For this reason, it was necessary to secure a certain amount of wheel base and the like for the transport vehicle, and it was not possible to sufficiently reduce the size.

[Problems to be solved by the invention]

The fact that the wheel base must be increased to a certain degree in this way results in poor revolving and turning properties. In particular, this type of vehicle has to travel around narrow alleys and the like, so this restriction greatly impairs its advantages. The present invention solves such a problem, and the point is that the load can be easily loaded even if the wheel base (body length) is short by changing the center of gravity moment of the load at the time of loading. It can be put in.

[Means for solving the problem]

In order to solve the above problems, the present invention has taken the following measures. That is,. A main body frame that has a self-propelled function and tilts forward and downward is supported by front and rear wheels, and a rotatable mounting is provided on a front axle that has gripping arms for gripping loads and supports front wheels. The expansion and contraction of the telescopic cylinder interposed between the main body and the main body causes the front wheel (3) to float up at the time of starting and the rear bottom portion to touch the ground to become a pivot point. A small transport vehicle comprising: a rotating frame that is arbitrarily rotated between a falling posture and a falling posture on the frame.

. The small transport vehicle as described above, wherein the gripper arm has an opening / closing mechanism operable from a main body side for gripping and releasing the load.

Provided each.

[Action]

By taking the above measures, when the load is gripped by the rotating frame and lowered toward the main body, the front wheel of the main body is lifted up, the rear bottom of the rotating frame and the ground point are changed, and the center of gravity of the load is changed. The moment becomes smaller than the moment of the center of gravity of the main body portion which is to be tilted forward, so that loading becomes possible.

〔Example〕

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

1 to 3 are side views of a small truck, and FIG. 4 is a front view. The truck has a chassis 2 provided with a main body frame 1 which is inclined forward and downward. The main body 6 is self-propelled by transmitting the power of the engine 5 to the rear wheel 4 and the gripping arm 8 for gripping the load 7. And a rotating frame 9 that rotates between the lying postures on which it falls on the lever. The turning frame 9 is a front axle that supports the front wheels 3.
An extendable cylinder 11 such as a hydraulic cylinder is interposed between the chassis 10 and the chassis 2. Therefore, the rotating frame 9 rotates between the standing posture and the falling posture by expanding and contracting the telescopic cylinder 11.

5 and 6 show an opening and closing mechanism 12 for opening and closing the gripping arm 8.
FIG. 4 is a plan view showing a gripping arm 8 having an arm shape capable of gripping the outer periphery of the load 7 and being rotatably pivotally mounted on two arm shafts 13 standing upright at the rear. (The rest 14 is also fixed to the arm shaft 13 so that the load 7 abuts on the rest 14). Further, a lever portion 8a is connected to a rear portion of the gripping arm 8, and the lever portion 8a is rotated around an arm shaft 13 to thereby hold the gripping arm 8a.
Is closed and the load 7 is gripped. That is, the slider 15 which comes into contact with the lever portion 8a is slidably fitted to the slider shaft 16, and the slider 15 is slid by the rotation of the cam 18 fixed to the support shaft 17. The rotation of the cam 18 around the support shaft 17 is performed by operating the grip opening / closing lever 19 provided on the main body 6. The contact between the lever 8a and the slider 15 and the contact between the cam 18 and the slider 15 are performed by the cam follower 2 to reduce frictional resistance.
The slider 15 is provided with a disc spring 22 therein. When the slider 15 pushes the lever portion 8a (when the gripping arm 8 grips the load 7), the disc spring 22 is Performed by repulsion. Further, the levers 8a are always resiliently resilient by a spring 23 to the side where the gripping arm 8 is opened.

As a result, when the grip opening / closing lever 19 is moved in the horizontal direction from the release side (a) position to the grip side (b) position,
The lever portion 19a rotates, and the cam 18
Is rotated to push the lever portion 8a of the gripping arm 8, the gripping arm 8 is closed from the open state (FIG. 5), and the load 7 is closed.
(Fig. 6). Note that the grip opening / closing lever
19 can be moved up and down in the gripping side (b) position, and by this operation, the direction switching valve 25 for switching the direction of the pressure oil supplied to the telescopic cylinder 11 is operated. That is, the grip opening / closing lever 19 is moved from the lower side (c) to the upper side (d).
, The lever portion 19b moves the operation spool 25a of the direction switching valve 25 (FIG. 7). When the direction of the pressure oil supplied to the telescopic cylinder 11 is switched, the telescopic cylinder 11 contracts. Then, the turning frame 9 is turned to the lying posture side.

By the way, loading of the load 7 at this time,
First, the load 7 is set up on the ground, and the main body 6 is approached with the rotating frame 9 in the standing posture, and the receiving plate 26 formed at the bottom of the rotating frame 9 is It is inserted into the bottom (for this reason, it is desirable that the bottom of the load 7 is slightly lifted off the ground by an appropriate caulking material or the like between the ground and the bottom of the load 7). Next, the telescopic cylinder 11 is contracted and turned to the turning frame 9 in the lying posture side. At this time, the center of gravity moment based on the weight W1 of the load 7 is determined by the distance between the front wheel ground point S and the center of gravity G1.
If L1, it is W1 × L1, and the center of gravity moment based on the weight W2 of the main body 6 is W2 × L2, where L2 is the distance between the front ground contact point S and the center of gravity G2. However, here, since the body length of the main body 6 is shortened, L2 is small, and W1 × L1> W2
× L2. Therefore, the main body 6 is moved forward and loading is not possible. However, when the telescopic cylinder 11 is shortened in this state, the front wheel 3 rises, and the rear bottom portion of the receiving plate 26 of the rotating frame 9 is changed to the ground point P. Leans backwards. At this time, if the distances from the ground point P are L3 and L4, the moments are respectively W1 × L3 and W2 × L4. In this case, L1> L3, L2 <L4, and therefore W1 × L3 <W2 × L4,
The main body 6 does not fall forward, and the turning frame 9 turns to the lying posture side. When the turning progresses and the ground point P of the turning frame 9 moves away from the ground, the front wheel 3 comes into contact with the ground again, and the front wheel ground point S becomes the action point again. The moment of the center of gravity of the load 7 at this time is W1 × L5 and W2 × L2, where L5 is the distance between the center of gravity G1 of the load 7 and the front wheel ground point S. In this case, L5 <L3. As a result, W1 × L5 <W2 × L2, and the rotating frame 9 turns to the lying posture side as it is, and reaches the lying posture in which it falls down along the inclination of the main body frame 1. The rearward rotation of the main body 6 is regulated by raising the stand 27. The gap from the ground is a when the front wheel 3 is in contact with the ground, b when the front wheel 3 is floating, and a
> B. This means that when the load 7 is lowered, the lifting of the receiving plate 26 attached to the bottom of the rotating frame 9 becomes small, and when the load 7 is loaded again, it is easy to put the load 7 on this. Means that

〔The invention's effect〕

As described above, the present invention has been described above. That is, the turning frame is moved from the upright standing position to the lying position after the front wheel 3 is lifted up at the start and comes into contact with the rear bottom to become the turning fulcrum. When the rotating frame 9 grips the load 7 and turns to the lying posture side, the point of action, that is, the turning point, The ground contact point is the front wheel contact point S
To the rotating frame ground point P, and accordingly the moment of the center of gravity of the load 7 is reduced, and the load 7 can be loaded on the main body 6 without the main body 6 falling over. Therefore, the body length of the main body 6 can be shortened, the turning radius can be reduced, and the overall weight can be reduced. Further, when the rotating frame 9 is in contact with the ground, the gap between the stand 27 and the ground becomes smaller from a to b, so that the stability of the vehicle body is also improved.

[Brief description of the drawings]

1 to 3 are side views of a small carrier, FIG. 4 is a front view, FIGS. 5 and 6 are plan views showing an opening and closing mechanism of a gripping arm, and FIG. 7 is a side view of a gripping opening and closing lever. It is. (Symbol) 1 ... body frame 3 ... front wheel 4 ... rear wheel 6 ... body 7 ... load 8 ... gripping arm 9 ... rotating frame 10 ... front axle 11 ... telescopic cylinder

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mikio Matsui 428 Enami, Onami, Okayama Pref.Seirei Industry Co., Ltd. (72) Inventor Yukihiro Fukuda 428 Enami, Okayama City, Okayama Pref. 56) References JP-A-53-47647 (JP, A) JP-A-54-125031 (JP, U) JP-A-63-9076 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , (DB name) B62B 3/00-5/06

Claims (2)

(57) [Claims] 1. A body (6) having a body frame (1) having a self-propelling function and inclined forward and downward supported by a front wheel (3) and a rear wheel (4), and a load (7). A telescopic cylinder (11) which is rotatably mounted on a front axle (10) having a gripping arm (8) for gripping and supporting a front wheel (3) and interposed between the main body (6). Due to the expansion and contraction, the front wheel (3) rises at the time of starting and the rear bottom part touches the ground and becomes a rotation fulcrum, and from the vertical standing position to the lying position falling on the main body frame (1) arbitrarily A small transport vehicle comprising a rotating frame (9) that rotates. 2. A holding arm (8) for holding a load (7).
Opening / closing mechanism (12) operable from the body (6) to be released
The small transport vehicle according to claim 1, comprising: