JP2012056444A - Walking type delivery vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a walking type delivery vehicle capable of easily performing hand-pushing running even though capable of performing forced drive running by a running device.SOLUTION: Right and left auxiliary wheels 5 and 5 which are freely rotated are provided on a rear side of the running device 2 and on a front and lower side of a grip part 3a of a handle 3, the right and left auxiliary wheels 5 and 5 are freely switchably constituted in a first grounding running position (a) positioned on a rear side of the running device 2 and a second grounding running position (b) positioned on the front side of the first grounding running position (a) and near to a center G of gravity of a machine body, the machine body can be made to run in a first grounding running position (a) in a state that both right and left auxiliary wheels 5 and 5 and the running device 2 are grounded by forcibly driving the running device 2 and handle-push running by an operator is made possible in a second grounding running position (b) by pushing down the handle 3 by the operator in a state that right and left auxiliary wheels 5 and 5 are grounded and the running device 2 floats from the ground, to be in a non-grounded state.

Description

  The present invention relates to a walking-type transport vehicle including a traveling device that is driven by power from a prime mover below a loading platform.

  2. Description of the Related Art Conventionally, in a so-called cat cart type walking transport vehicle, a technique for forcibly driving a traveling device composed of a crawler and wheels with a prime mover such as an engine or an electric motor to reduce the labor of an operator during transport is known. ing. (For example, refer to Patent Documents 1 and 2.)

JP 2007-283915 A Utility Model Registration No. 3057660

However, since the ones described in Patent Documents 1 and 2 are always forced to travel by grounding the traveling device during transportation, downhill traveling or emptying that can be easily performed manually by hand only. Even when traveling on a flat ground with a load, the traveling device had to be forcibly driven, and power was wasted. In addition, even if a clutch is provided between the prime mover and the traveling device, the prime mover is stopped and the traveling device is in the neutral state to perform the manual push traveling, the transmission system to the traveling device is tangled and rotated. There is a problem that becomes large.
The present invention improves the above-described conventional problems, and an object thereof is to provide a walking-type transport vehicle that can be easily driven by hand while being capable of traveling by forcibly driving a traveling device. .

  In order to achieve the above object, the present invention provides a walking-type transport vehicle in which a traveling device 2 forcibly driven by power from a prime mover 4 is provided below the loading platform 1 and a hand-held handle 3 is provided behind the loading platform 1. Auxiliary wheels 5 and 5 that freely rotate in the left and right positions behind the traveling device 2 and in front of and below the grip portion 3a of the handle 3 are provided, and the left and right auxiliary wheels 5 and 5 and the traveling device 2 in the longitudinal direction of the body are provided. The vehicle body center of gravity G is positioned between the vehicle 2 and the axle 2a, and the left and right auxiliary wheels 5 and 5 are arranged in a first ground travel position a rear of the travel device 2 and in front of the first ground travel position i. To the second ground travel position B approaching the center of gravity G of the vehicle body, and at the first ground travel position A of the left and right auxiliary wheels 5, 5, the left and right auxiliary wheels 5, 5 and the travel device 2 In a state where both are grounded, Is forced to drive the vehicle, and the left and right auxiliary wheels 5 and 5 are grounded when the operator depresses the handle 3 at the second ground travel position B of the left and right auxiliary wheels 5 and 5. In this state, the traveling device 2 is brought into a non-grounded state in which the traveling device 2 is levitated from the ground, so that it can be manually pushed by an operator.

  In addition, the traveling device 2 is provided only at the center in the left-right direction of the airframe, and the left and right auxiliary wheels 5 and 5 are configured to be freely switchable to a non-grounded traveling position C located rearward and upward from the first grounded traveling position i. And

  Further, the left and right auxiliary wheels 5, 5 are configured to freely rotate in the left-right direction at the first ground travel position a, and in conjunction with the switching of the left and right auxiliary wheels 5, 5 to the second ground travel position b. The left and right auxiliary wheels 5 and 5 are fixed and held in a straight running posture.

According to the first aspect of the present invention, the left and right auxiliary wheels 5 and 5 are set at the first ground traveling position a when loading a heavy object or traveling uphill, and the traveling device 2 and the left and right auxiliary wheels 5 are set. , 5 can be grounded in a stable posture, and by driving the traveling device 2 to forcibly drive, the labor of the operator can be reduced during transportation. Further, when traveling on a flat ground with a downhill or empty load, the left and right auxiliary wheels 5 and 5 are set at the second ground traveling position B, and the grounding surface is lifted from the ground without driving the traveling device 2. As described above, only the left and right auxiliary wheels 5 and 5 are grounded, and the vehicle can be manually pushed only by human power, so that waste of power can be eliminated.
In addition, since the second ground traveling position B of the left and right auxiliary wheels 5 and 5 is set to a position in front of the first ground traveling position a and close to the position of the center of gravity G of the vehicle body, the operator holds the handle 3 with a relatively light force. By pushing down, it is possible to easily raise the traveling device 2 as a state where the left and right auxiliary wheels 5 and 5 are grounded, that is, as a fulcrum and to be in a non-grounded state.

  In the invention described in claim 2, the left and right auxiliary wheels 5 and 5 are set at the upper non-ground traveling position C, and only the traveling device 2 positioned at the center in the left-right direction of the aircraft is forced to ground. By driving, it is possible to easily travel even when the travel path width is narrow or on rough terrain in the field.

  Further, in the invention described in claim 3, the left and right auxiliary wheels 5, 5 are freely rotated in the left-right direction at the first ground travel position a, so that the traveling device 2 and the left and right auxiliary wheels 5, 5 are grounded. When the vehicle travels stably, the left and right direction conversion and turning operation can be easily performed by operating the hand-held handle 3, and the left and right auxiliary wheels 5 and 5 are moved straight at the second ground traveling position b. By holding the vehicle in a fixed posture, it is possible to easily travel straight ahead while preventing the aircraft from inadvertently moving to the left and right in the case of a manually pushed vehicle in which only the left and right auxiliary wheels 5 and 5 are grounded.

It is a right view of a walking type transport vehicle, and shows a state in which the left and right auxiliary wheels are switched to the first ground travel position. It is a left view of a walking type transport vehicle. It is a top view of a walk type transportation vehicle. It is a top view of a walk-type conveyance vehicle, and shows the support transmission structure of a left and right auxiliary wheel and a traveling apparatus. It is a right view of a walking type transport vehicle, and shows a state in which the left and right auxiliary wheels are switched to the second ground traveling position. It is a right view of a walking type transport vehicle, and shows a state in which left and right auxiliary wheels are switched to a non-ground traveling position. It is a rear view which shows the attachment part of the handle | steering-wheel conveyance vehicle handle, an airframe frame, and an auxiliary wheel. It is an expansion right view which shows the attachment part of an auxiliary wheel. It is a fragmentary top view which shows the attachment part of a right and left auxiliary wheel, (A) shows the case where a left and right auxiliary wheel is a straight advance posture, (B) shows the case where a left and right auxiliary wheel is a left turning posture, C) shows a case where the left and right auxiliary wheels are in a right-turning posture. (A) is a principal part top view of the state which cancelled | released position regulation of the left and right auxiliary wheel, (B) is a principal part top view of the state which controlled the position of the left and right auxiliary wheel. FIG. 6 is a left side view of a state in which the left and right auxiliary wheels are switched to a first ground traveling position and the vertical swing of the traveling device is restricted. It is another Example figure of the mechanism which controls the vertical swing of a traveling device.

One embodiment of the present invention will be described with reference to FIGS.
1 is a right side view of a walking type transport vehicle adopting the present invention (right side with respect to the forward direction of the transport vehicle), FIG. 2 is a left side view of the walking type transport vehicle, and FIG. 3 is a plan view of the walking type transport vehicle. A single traveling device 2 is provided below the loading platform 1 at the center in the left-right direction of the fuselage, and a hand-held handle 3 is provided behind the loading platform 1, and the traveling device 2 is disposed below the handle 3 on the base side. A prime mover (engine) 4 is forcibly driven.
Auxiliary wheels 5 and 5 are provided at the left and right positions of the airframe behind the traveling device 2, and the auxiliary wheels 5 and 5, which will be described in detail later, are first spaced apart rearward from the traveling device 2. A ground contact position a, a second ground travel position b that approaches the traveling device 2 in front of the first ground travel position a, and is close to the center of gravity G of the vehicle body, and a non-retracted rearward upper side from the first ground travel position a. It can be switched to the ground running position c.

  The loading platform 1 includes front and rear side frames 1L and 1R provided on the left and right sides, front and rear frames 1f and 1b in the left and right directions fixed to the front ends and rear portions of the side frames 1L and 1R, and both side frames 1L. , 1R, two middle frames 1m, 1m having front and rear ends fixed to the front frame 1f and the rear frame 1b, and front and rear plates 1p, 1k provided between the two middle frames 1m, 1m, From the standing wall 1u provided on the front upper side of the prime mover 4 at the rear of both side frames 1L, 1R, and slidable frames 1w, 1w, 1w provided on the outside of both side frames 1L, 1R and the front side of the front frame 1f, etc. It is composed.

The handle 3 is composed of left and right handle frames 3L, 3R formed integrally with the side frames 1L, 1R extending rearward and upward, a grip portion 3a provided at the rear of the handle frames 3L, 3R, and the like. The grip portion 3a includes first grip portions 3a1 and 3a1 provided at the rear ends of both side frames 1L and 1R, and a second grip portion 3a2 protruding upward slightly to the front of the first grip portions 3a1 and 3a1. ing. As shown in FIGS. 1 and 2 and FIG. 7 which is a rear view of the walking-type transport vehicle, the second grip portion 3a2 is composed of a rod-like body in the left-right direction with the left and right ends fixed to both side frames 1L and 1R. The center of the body in the left-right direction protrudes upward and is formed in a mountain shape with a high center in the rear view. With such a configuration, the second grip portion 3a2 is positioned higher than the first grip portions 3a1 and 3a1 in the side view. ing.
A throttle lever 6 of the prime mover 4 is provided in the vicinity of the right first gripping portion 3a1.

Next, the traveling device 2 will be described with reference to FIGS.
The traveling device 2 is constituted by a crawler type in which a crawler 2d is wound around a rear drive wheel 2b fixed to an axle (drive shaft) 2a and a front driven wheel 2c. Below the middle frames 1m and 1m, left and right lower frames 7 and 7 having front and rear ends fixed to the middle frames 1m and 1m are provided, and the left and right brackets 7a fixed to the lower frames 7 and 7 are attached to the axles. 2a is rotatably attached, and a driven wheel 2c is supported at the tip of a crawler frame 2e in which a base end portion is rotatably fitted and supported on the axle 2a. With the above support structure, the crawler type traveling device 2 is configured such that the driven wheel 2c side can swing up and down around the axle 2a. With this configuration, even when the road surface is inclined forward or backward during running, the crawler type traveling device 2 swings up and down following the road surface, so that the crawler type traveling device 2 is sufficiently grounded over the entire length. And driving driving force can be maintained.
In addition, a lower limit stopper 29 is provided on the rear end of the crawler frame 2e so as to protrude leftward. The lower limit stopper 29 faces the lower side of the left bracket 7a, and the crawler-type traveling device 2 causes the axle 2a to move. When the lower limit stopper 29 comes into contact with the lower side of the left bracket 7a when it is turned downward (swing) by a certain amount to the center, it is configured to restrict further downward turning (swing). Although not shown, an upper limit stopper is also provided.
The travel device 2 is driven by transmitting the power of the prime mover 4 to the axle 2a by the centrifugal clutch 8, the speed reducer 9, the chain transmission device 10, and the like.

Next, the auxiliary wheels 5 and 5 will be described with reference to FIGS.
The left and right auxiliary wheels 5, 5 are arranged behind the traveling device 2 and in front of and below the handle 3 a of the handle 3, and between the axle 2 a of the traveling device 2 and the auxiliary wheels 5, 5 in the front-rear direction. The center of gravity G of the walking transport vehicle is located.
As described above, the left and right auxiliary wheels 5, 5 are integrated, and are close to the body center of gravity G in front of the first ground travel position a and the first ground travel position a that is far behind the travel device 2. It is configured to be switchable between the second ground travel position B and the non-ground travel position C retracted rearward and upward from the first ground travel position A.

  As shown in FIG. 1, at the first ground traveling position A of the auxiliary wheels 5, 5, the aircraft is in a so-called three-wheel state in which the traveling device 2 at the front center and the left and right auxiliary wheels 5, 5 are grounded. The airframe is driven by driving the driving device 2 with the prime mover 4 in such a state that it is stably supported. In addition, the height of the auxiliary wheels 5 and 5 is set so that the loading platform 1 is substantially parallel to the ground in a state where the traveling device 2 and the left and right auxiliary wheels 5 and 5 are grounded.

Further, the second ground travel position B of the auxiliary wheels 5 and 5 is a position that is close to the front body center of gravity G while maintaining the height at the first ground travel position a. As shown in FIG. At the second ground traveling position b of the wheels 5 and 5, the operator pushes down the handle 3 to bring the traveling device 2 up from the ground with the grounding point of the auxiliary wheels 5 and 5 as a fulcrum, and the prime mover 4 After stopping, the grip portion 3a (particularly, the second grip portion 3a2) of the handle 3 is gripped and manually pushed (so-called rear car travel) is performed manually.
In the embodiment, the height of the second ground traveling position b of the auxiliary wheels 5 and 5 is set slightly lower than that of the first ground traveling position a. In addition, at the second ground traveling position b, the auxiliary wheels 5 and 5 are located in the vicinity of the rear of the aircraft center of gravity G, and the aircraft center of gravity G is in the front-rear direction between the axle 2a of the traveling device 2 and the grounding point of the auxiliary wheels 5 and 5. Located between.

  As shown in FIG. 6, when the auxiliary wheels 5 and 5 are switched to the non-ground traveling position C, the operator drives the traveling device 2 with the prime mover 4 to hold the handle 3 a (particularly, the first portion) of the handle 3. While gripping the grip portion 3a1), the vehicle travels in a so-called one-wheel state in which only the traveling device 2 is grounded.

Next, details of the structure for switching the auxiliary wheels 5 and 5 to the above-described three-positions A to C will be described with reference to FIGS.
The left and right auxiliary wheels 5, 5 are integrated and can be rotated and fixed around a fulcrum shaft 11 in the left-right direction supported on the lower frame 7, 7 side, thereby switching to the above-mentioned three positions a to c.
That is, the support plate 12 is fastened and fixed to the brackets 7b and 7b which are welded and fixed to the rear lower surfaces of the lower frames 7 and 7 by bolts 12a, and the cylinder 13 is welded and fixed to the support plate 12. . The fulcrum shaft 11 is rotatably fitted in the cylindrical body 13, and left and right support arms 14 and 14 are integrally fixed to the left and right projecting portions of the fulcrum shaft 11, respectively. The support arms 14 and 14 extend in the front-rear direction across the fulcrum shaft 11, and pivot shafts 15 and 15 in the vertical direction are pivotally attached to the rear side of the support arms 14 and 14. Auxiliary wheels 5 and 5 are attached to support brackets 16 and 16 fixed to the lower side of 15 so as to freely rotate via support shafts 5a and 5a.

Guide plates 17 and 17 are externally fitted and fixed to the left and right ends of the cylindrical body 13, and a long hole 17 a and a round hole 17 b centered on the fulcrum shaft 11 are provided in the right guide plate 17. The left and right guide plates 17 and 17 are provided with protrusions (pins) 17c and 17c that protrude above the support arms 14 and 14, respectively. On the other hand, on the front side of the right support arm 14, a stopper pin 18 that can be freely inserted into and removed from the long hole 17a or the round hole 17b of the right guide plate 17 is attached, and the stopper pin 18 is inserted into the long hole 17a or the round hole 17b. It is biased by a spring 19 in the direction.
Then, the switching between the first ground travel position A and the second ground travel position B of the auxiliary wheels 5 and 5 is performed with the stopper pin 18 being inserted into the elongated hole 17a of the right guide plate 17, FIG. As shown in FIG. 4, the stopper pin 18 is in contact with the lower end of the long hole 17a at the first ground travel position a, thereby restricting the positions of the auxiliary wheels 5 and 5 at the first ground travel position a (upward or non-ground travel position). 5), as shown in FIG. 5, the stopper pin 18 contacts the upper end of the long hole 17a at the second ground travel position b, so that the auxiliary wheels 5 and 5 travel in the second ground travel. Position restriction (regulation of upward rotation) is performed at position b. In the second ground traveling position b, the upper surfaces of the left and right support arms 14 and 14 are in contact with the projections 17c and 17c, and the projections 17c and 17c are also upper limit stoppers for the auxiliary wheels 5 and 5.

Further, as shown in FIG. 10, the auxiliary wheels 5 and 5 are switched from the first ground travel position A to the non-ground travel position C in a state where the stopper pin 18 is pulled out from the long hole 17a against the spring 19. Temporarily held (a U-shaped stopper 18a is provided integrally with the stopper pin 18, and after the stopper pin 18 is removed from the long hole 17a, it is rotated 90 degrees to support the U-shaped stopper 18a with a support arm. 14 and temporarily holding the auxiliary wheels 5 and 5 in the non-ground traveling position c direction, as shown in FIG. 6, the upper surfaces of the left and right support arms 14 and 14 are projected 17c, In the upper limit state in contact with 17c, the temporary holding state of the stopper pin 18 is released, the stopper pin 18 is inserted into the round hole 17b of the right guide plate 17, and the auxiliary wheels 5, 5 are positioned at the non-ground traveling position c. Regulation (below The rotation of the regulation) to.
As described above, the auxiliary wheels 5 and 5 are moved to the first ground travel position a, the first position by the guide plate 17, the long hole 17a, the round hole 17b, the protrusion 17c, the stopper pin 18, the spring 19, and the support arms 14 and 14. A fixing mechanism for restricting the position at each of the two ground contact travel positions B and the non-ground travel position C is configured.

Further, as shown in FIG. 9, the left and right auxiliary wheels 5 and 5 are configured to freely rotate in the left and right directions around the rotation shafts 15 and 15 in the up and down direction at the first ground traveling position a. When the wheels 5 and 5 are switched to the second ground traveling position B or the non-ground traveling position C, the left and right auxiliary wheels 5 and 5 are fixedly held in a straight traveling posture in conjunction with the switching operation. .
That is, the left and right support brackets 16 and 16 to which the left and right auxiliary wheels 5 and 5 are attached are pivotally connected by the link 20, and the left and right auxiliary wheels 5 and 5 are integrally connected to the rotation shafts 15 and 15 via the link 20. The guide pin 20a is provided so as to be pivotable left and right at the center, and the guide pin 20a protrudes upward at the center of the link 20 in the left-right direction, while the guide plate 20 is positioned on the support plate 12 positioned above the link 20. 20a is provided with a guide hole 12b for insertion from below.

When the auxiliary wheels 5 and 5 are in the first ground traveling position a and in the straight running posture, the guide pin 20a is positioned at the center position a ′ of the guide hole 12b, and the auxiliary wheels 5 and 5 are rotated by the rotating shaft 15. , 15 in the left-right direction, the guide pin 20a freely moves in the guide hole 12b over the left and right positions "". That is, the left and right auxiliary wheels 5 and 5 are freely rotatable in the left-right direction at the first ground travel position a. In addition, protrusions (pins) 16a and 16a are provided on the upper surfaces of the left and right support brackets 16 and 16, and the protrusions 16a and 16a come into contact with the inner side surfaces of the support arms 14 and 14, so that the left and right auxiliary wheels 5 are provided. , 5 is set as the left / right rotation limit.
Further, elastic bodies (winding springs) 21 and 21 are fixed to both sides of the upper surface of the support plate 12 sandwiching the guide pins 20a, and the elastic bodies 21 and 21 are in contact with the left and right of the guide pins 20a, so It is always energized so as to return to the center position (that is, the auxiliary wheels 5 and 5 are in a straight running posture).

Further, when the auxiliary wheels 5 and 5 are rotated around the fulcrum shaft 11 from the first ground travel position A to the second ground travel position B, the link 20 and the guide pin 20a also rotate together, and the guide pin 20a Since the position b ′, which is a narrow portion on the front side of the center of the guide hole 12b, is entered, the lateral movement of the guide pin 20a is restricted by the narrow portion. That is, when the left and right auxiliary wheels 5 and 5 are switched to the second ground traveling position B, the left and right auxiliary wheels 5 and 5 are fixedly held in a straight traveling posture.
Similarly, when the auxiliary wheels 5 and 5 are rotated from the first ground travel position a to the non-ground travel position c, the guide pin 20a is moved to a position c ′ that is a narrow portion on the center rear side of the guide hole 12b. Therefore, the left and right auxiliary wheels 5 and 5 are fixedly held in a straight running posture.

Furthermore, in the walking type transport vehicle of this embodiment, the crawler type traveling device 2 is fixed at a position where the crawler type traveling device 2 is moved downward about the axle 2a, and the crawler type traveling device 2 swings up and down around the axle 2a. Crawler fixing switching means for restricting the above is provided.
The crawler fixing switching means will be described with reference to FIGS. 2 and 11. FIG. 2 shows a state in which the restriction by the crawler fixing switching means is released, and FIG. 11 shows a state in which the crawler type traveling device 2 is fixed and restricted by the crawler fixing switching means. In the crawler fixing switching means, an arm 22 having a roller 22a attached to the tip is pivotally attached to a support shaft 2f on the left side surface of the crawler frame 2e. An operating tool (fixed switching operating lever) 23 provided on the side is connected by a connecting tool (rod) 24.

  When the operating tool 23 is operated from the imaginary line position to the solid line position in FIG. 11, the arm 22 rotates upward, and the roller 22 a at the tip of the arm 22 is attached to the guide body 25 fixed to the lower surface of the left lower frame 7. Contacted from below, the operating device 2 swings the traveling device 2 around the axle 2a so that the driven wheel 2c side moves downward, and the driven wheel 2c side of the traveling device 2 and the left and right auxiliary wheels 5, 5 are grounded. In this state, the axle 2b side of the traveling device 2 relatively moves upward and is slightly separated from the ground. And in this state, the operation tool 23 is fixed in a state where the fulcrum exceeds the rotation fulcrum 23a, and the crawler type traveling device 2 is fixed in a position where the driven wheel 2c side (tip side) is grounded, The crawler type traveling device 2 is restricted from swinging upward about the axle 2a. In the embodiment, the upward swing of the crawler type traveling device 2 is restricted, but the upward and downward swings may be restricted.

  In addition, what is shown in FIG. 12 does not provide an auxiliary wheel like the said Example, and is the above-mentioned crawler fixed switching means to the walk-type transport vehicle which has the single crawler type traveling apparatus 2 which provided the stand 25 instead. The arm 27 pivotally attached to the lower frame 7 via the support shaft 7f is rotated downward by the operation of the operation tool 26 through the connecting tool (wire) 26a. The guide body 28a integrated with the crawler frame 28 is pressed by 27a, and the crawler frame 28 is fixed at the downward movement position. As a result, the crawler type traveling device 2 is restricted from swinging upward about the axle 2a, and the stand 25 and the tip side (the driven wheel 2c side) of the crawler type traveling device 2 are grounded to walk. The carriage is in a standby position.

The embodiment of the present invention is as described above, and the usage pattern of the walking type transport vehicle will be described below.
First, when a heavy object is loaded on a flat ground or when going uphill, as shown in FIG. 1, the left and right auxiliary wheels 5 and 5 are set at the first grounding travel position A, and the traveling device 2 and the left and right auxiliary wheels are set. The traveling device 2 is driven by the prime mover 4 with the grounds 5 and 5 grounded. In this mode of use, the airframe can be stably supported by the front center traveling device 2 and the rear left and right auxiliary wheels 5, 5, and can be operated by forcibly driving the traveling device 2. The operator does not have to manually push the walking-type transport vehicle, and the labor of the operator can be reduced.

  Further, when the auxiliary wheels 5 and 5 are set at the first grounding travel position A as described above, the left and right auxiliary wheels 5 and 5 are integrated with the rotation shafts 15 and 15 through the link 20 as described above. Since the left and right auxiliary wheels 5 and 5 are in a so-called caster state because the left and right auxiliary wheels 5 and 5 are freely rotatable in the left and right direction, the operator can easily operate the aircraft by holding the first holding portion 3a1 of the handle 3 and operating the steering wheel. Can be redirected and turned. Further, as described above, the link 20 is urged so as to return to the center position by the elastic bodies 21 and 21, and the auxiliary wheels 5 and 5 are held in a straight running posture at the center position. After the direction change or turning operation by the three operations is completed, the aircraft can be easily returned to the straight traveling state, and the straight traveling state can be maintained.

  Further, since the crawler type traveling device 2 is configured to freely swing up and down around the axle 2a, the crawler type traveling device 2 can be used even when the ground is tilted back and forth or has unevenness during traveling. The traveling device 2 swings up and down following the inclination of the ground and the like, and the crawler type traveling device 2 can be sufficiently grounded over its entire length to maintain the driving traveling force.

  In addition, when the auxiliary wheels 5 and 5 are set at the first ground traveling position a, in the standby posture before loading the transport vehicle, the traveling device 2 is grounded, and the left and right auxiliary wheels 5 and 5 are grounded and stand. In this case, if the crawler type traveling device 2 is freely swingable up and down around the axle 2a as described above, for example, as shown in FIG. , 5 and three points directly below the driving wheel 2b fixed to the axle 2a located at the substantially center portion in the front-rear direction of the loading platform 1, the front side of the loading platform 1 is not substantially supported. Accordingly, in this state, for example, if an attempt is made to load on the left and right ends of the front side of the loading platform 1, there is a concern that the weight of the machine body may fall in the left and right direction in which the aircraft is loaded.

However, as described above, the crawler fixing switching means is provided, and as shown in FIG. 11, when the operating tool 23 is operated from the imaginary line position to the solid line position, the crawler type traveling device 2 is in a posture in which the driven wheel 2c side is grounded. In such a standby posture, the support point of the machine body is the left and right auxiliary wheels 5 and 5 and the tip side of the crawler type traveling device 2 (the driven wheel 2c side). When loading on the left and right ends of the front side of the vehicle 1, it is possible to prevent the machine body from overturning as compared with the case where the crawler-type traveling device 2 is not restricted from swinging up and down.
After completion of loading, the operation tool 23 is operated to release the restriction of the crawler type traveling device 2 by the crawler fixing switching means and perform the traveling operation.
As shown in FIG. 12, the crawler fixing switching means is a so-called cat-car-type walking transport vehicle having a single crawler type traveling device, and is not provided with auxiliary wheels as in the present invention, but instead is a stand. It can be applied to those provided with 25.

  Further, when the auxiliary wheels 5 and 5 are set at the first ground traveling position a and the vehicle travels between the paddy fields, the treads of the left and right auxiliary wheels 5 and 5 are adjusted and adjusted so as to fit the paddle interval. Also good.

Next, when traveling on a downhill or when there is little load or load on a flat ground, and when it is possible to travel with a relatively small pushing force by the operator's human power, the left and right auxiliary wheels 5, 5 are Set to the second ground running position position b.
The auxiliary wheels 5 and 5 are switched from the first ground travel position position A to the second ground travel position position B by the following procedure. That is, when the auxiliary wheels 5 and 5 are lifted from the ground by lifting the handle 3 from the state of the first grounding travel position a shown in FIG. 1, the auxiliary wheels 5 and 5 are rotated forward about the fulcrum shaft 11 by their own weight. Further, when the operator lowers the handle 3 while pushing the auxiliary wheels 5 and 5 and rotating them forward, the auxiliary wheels 5 and 5 are grounded, and the weight of the machine body is added to rotate forward, and the stopper pin 18 is moved. Abutting on the upper end of the long hole 17a, the rotation of the auxiliary wheels 5, 5 is restricted, and the second grounding travel position B is switched.

  Since the body center of gravity G is located between the axle 2a of the traveling device 2 and the ground point of the auxiliary wheels 5 and 5 in the front-rear direction even at the second ground traveling position B of the auxiliary wheels 5 and 5, the second The aircraft is in a stable standby posture in a state where the left and right auxiliary wheels 5 and 5 and the traveling device 2 are in contact with each other at the ground traveling position b. When loading in this standby position, the crawler-type traveling device 2 is restricted from swinging up and down by the crawler fixing switching means in the same manner as when the auxiliary wheels 5 and 5 are set at the first ground traveling position a. To fix the position.

  Next, when traveling, as shown in FIG. 5, the operator holds down the handle 3 by holding the second grip portion 3 a 2 of the handle 3, grounds only the auxiliary wheels 5, 5, and the traveling device 2 moves from the ground. Leave the grounded surface ungrounded. At this time, the crawler type traveling device 2 rotates downward about the axle 2a by its own weight, but the lower limit stopper 29 protruding from the rear end of the crawler frame 2e contacts the lower side of the left bracket 7a. Since further downward rotation is restricted, the traveling device 2 floats from the ground. Then, with the prime mover 4 stopped in this state, the grip portion 3a (particularly, the second grip portion 3a2) of the handle 3 is gripped to perform manual push travel (so-called rear car travel) with only human power.

In the above-described manual travel, it is possible to travel with the prime mover 4 stopped, so that waste of power, that is, fuel consumption of the engine that is the prime mover can be reduced. In addition, since the auxiliary wheels 5 and 5 are close to the center of gravity G of the vehicle body at the second ground traveling position B, the operator pushes down the handle 3 with a relatively light force so that the left and right auxiliary wheels 5 and 5 are used as fulcrums. The traveling device 2 can be easily raised and brought into a non-grounded state.
In addition, since the second gripping portion 3a2 of the handle 3 protrudes upward from the first gripping portion 3a1 and is at a high position, the operator can easily push down the handle 3 by grasping the high-level second gripping portion 3a2. Since the second gripping portion 3a2 of the handle 3 does not become lower than necessary even while traveling, the operator can easily travel while holding the second gripping portion 3a2.

Further, as described above, at the second ground traveling position b of the auxiliary wheels 5, 5, the guide pin 20 a protruding from the link 20 is at a position b ′ that is a narrow portion on the center front side of the guide hole 12 b of the support plate 12. Since the left and right auxiliary wheels 5 and 5 are fixedly held in a straight running posture, the right and left wobbling of the airframe is prevented as much as possible and the straightness is improved in hand-running with only the auxiliary wheels 5 and 5 in contact with the ground. be able to.
Further, in the above-described manual travel, for example, when the traveling device 2 is grounded by raising the handle 3 on a downhill or the like, the traveling device 2 is configured to substantially act as a brake. That is, even if the traveling device 2 is grounded and tries to rotate, the speed reducer transmitted to the traveling device 2 does not rotate and functions as a brake, and the traveling device 2 does not rotate freely. Therefore, by simply operating the traveling device 2 on the ground, it is possible to prevent the aircraft from accelerating more than necessary even on downhills, and it is possible to drive safely and eliminate the need for a dedicated brake device, thus reducing costs. It becomes.

  Further, even when the auxiliary wheels 5 and 5 are set to the first ground travel position position A and the travel operation by driving the travel device 2 is being performed, the auxiliary wheels 5 and 5 are brought into the manually pushed travel state of the second ground travel position B. If the traveling device 2 is floated by switching, the traveling device 2 can be pulled backward to travel backward, so that the traveling device 2 does not require a reverse transmission and the cost is reduced.

Further, when traveling on a narrow road with a narrow traveling path or a gap between fields, the left and right auxiliary wheels 5 and 5 are set to the non-ground traveling position C as shown in FIG.
Then, after loading the left and right auxiliary wheels 5, 5 and the traveling device 2 in a standby posture, the operator drives the traveling device 2 with the prime mover 4, and the operator holds the first grip 3 a 1 of the handle 3. While holding, the aircraft is lifted so that the left and right auxiliary wheels 5 and 5 are ungrounded, and so-called single-wheel traveling is performed with only the traveling device 2 grounded. In this single-wheel drive, the vehicle can travel even if the travel road width is narrow. Further, as in the case of traveling with the auxiliary wheels 5 and 5 set to the first ground traveling position a, the crawler traveling device 2 can freely swing up and down around the drive shaft 2a. Even on rough terrain where the ground is inclined or uneven, the crawler-type travel device 2 can swing up and down following the ground and maintain its driving travel force.
In addition, when the auxiliary wheels 5 and 5 are switched to the non-ground traveling position C, the left and right auxiliary wheels 5 and 5 are fixedly held in the straight traveling posture, so that a stable standby posture can be taken and auxiliary assistance is performed during traveling. The wheels 5 and 5 do not get in the way of the running operation by shaking from side to side.

In addition, in embodiment of this invention, although the traveling apparatus 2 is comprised by the crawler type, it is good also as a wheel-type traveling apparatus.
Further, the auxiliary wheels 5 and 5 are turned around the fulcrum shaft 11 in the left-right direction so as to be switched between the first ground travel position a and the second ground travel position b. For example, it may be configured to switch between the first ground travel position A and the second ground travel position B by a forward / backward slide operation, and the first ground travel position B and the second ground travel position B It may be configured to be switched by making it detachable. Further, the switching of the auxiliary wheels 5 and 5 to the non-ground traveling position C is not specified as a structure that rotates around the fulcrum shaft 11 as described above.
In the embodiment of the present invention, the auxiliary wheels 5 and 5 are connected to the first ground travel position in conjunction with the switching operation between the first ground travel position A and the second ground travel position B of the auxiliary wheels 5 and 5. Although it is configured to be freely rotatable in the left-right direction at B and to be fixed and held in the straight running posture at the second ground travel position B, an operation tool for switching the auxiliary wheels 5 and 5 between the freely rotating state and the fixed holding state is provided separately. It is also possible.
The prime mover 4 is not limited to an engine but may be an electric motor or the like.

DESCRIPTION OF SYMBOLS 1 Carriage 2 Traveling apparatus 2a Axle 3 Handle 3a Grasping part 4 Motor 5 Auxiliary wheel G Body center of gravity a 1st grounding traveling position b 2nd grounding traveling position c Non-grounding traveling position

Claims (3)

  In the walking type transport vehicle in which the traveling device (2) forcibly driven by the power from the prime mover (4) is provided below the loading platform (1) and the hand-held handle (3) is provided behind the loading platform (1), Auxiliary wheels (5) and (5) that freely rotate to the left and right positions below the traveling device (2) and in front of and below the grip portion (3a) of the handle (3) are provided. (5), (5) is configured such that the center of gravity (G) is located between the axle (2a) of the travel device (2), and the left and right auxiliary wheels (5), (5) are traveled. Switchable between a first ground travel position (a) behind the device (2) and a second ground travel position (b) approaching the center of gravity (G) in front of the first ground travel position (a). And the left and right auxiliary wheels (5), (5) at the first ground travel position (A) In the state where the auxiliary wheels (5), (5) and the traveling device (2) are grounded together, the traveling device (2) is forcibly driven to enable the vehicle to travel, and the left and right auxiliary wheels (5 ), (5) In the second ground traveling position (b), the traveling device (2) with the left and right auxiliary wheels (5), (5) grounded by the operator pressing down the handle (3). A walking type transport vehicle characterized in that it is configured to be in a non-grounded state that floats from the ground and can be manually pushed by an operator.   The travel device (2) is provided only at the center in the left-right direction of the airframe, and the left and right auxiliary wheels (5), (5) are moved to the non-ground travel position (c) at the rear upper side from the first ground travel position (A). The walking type transport vehicle according to claim 1, wherein the walking type transport vehicle is configured to be switchable.   The left and right auxiliary wheels (5), (5) are configured to freely rotate in the left-right direction at the first ground travel position (A), and the second ground travel of the left and right auxiliary wheels (5), (5). The walk-type transport vehicle according to claim 1 or 2, wherein the left and right auxiliary wheels (5), (5) are fixedly held in a straight running posture in conjunction with switching to the position (b).

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