JP4058533B2 - Carriage for transportation - Google Patents

Description

  The present invention relates to a transport carriage that can be folded to reduce an occupied floor area.

As this type of transport cart, for example, as shown in Patent Document 1 and Patent Document 2, the cargo bed connects the front and rear both end cart portions each having wheels, and the front and rear end cart portions to each other, and the front and rear end vehicles. 2. Description of the Related Art A transport cart is known that includes a load support base that is configured to be foldable so that a central portion rises in order to bring the cart portions close to each other. Thus, as described in Patent Documents 1 and 2, this type of conventional foldable transport cart can be folded so that the load supporting platform itself between the front and rear cart portions rises at the center. It was configured.
Japanese Utility Model Publication No. 54-11651 Japanese Utility Model Publication No. 64-28362

  Therefore, in the foldable transport cart having the conventional configuration as described above, when the load support base is used in a horizontally expanded state, the load support base exceeds the horizontal posture due to a load acting downward on the center thereof. It is not only necessary to prevent downward bending by any means, but since there is a bent joint at the center in the length direction of the load support base, there is no such a bent joint. The rigidity of the entire carriage is reduced as compared with a general transportation carriage having a flat load support base. Moreover, since the cut is formed in the load supporting surface by the bent joint portion, there is a problem in handling such that it becomes difficult to slide the load on the load supporting surface.

An object of the present invention is to provide a transporting carriage that can solve the above-described conventional problems. When the means is shown with reference numerals of embodiments to be described later, a loading platform 1 is shown. However, the front and rear end carriages 6a and 6b each having wheels (universal wheels 2a to 3b) and the front and rear end carriages 6a and 6b are connected to each other and the front and rear end carriages 6a and 6b are close to each other. For this purpose, the carriage is composed of a carrier main body 8 that is foldable so that the central part stands up, and the carrier main body 8 is attached to one of the two carriage parts 6a and 6b. A load support base 8a that is pivotally supported in a vertically swingable manner and does not have a bent portion in the middle, and an intermediate position in the longitudinal direction of the load support base 8a and the other carriage 6a. It is composed of a vertical movement frame 8b that is, before The load support base 8a has a pair of left and right intermediate wheels (fixed in the direction fixed) on the left and right sides of the vertical movement frame 8b at the intermediate position in the longitudinal direction of the load support base 8a. Wheels 4a, 4b) are attached, and when the cargo bed body 8 is folded, the lower half portion of the upright load support platform 8a and the vertically moving frame 8b are adjacent to each other.

In carrying out the present invention having the above-described configuration, specifically, as described in claim 2, the load supporting base portion 8a is folded so that a central portion stands between the front and rear end carriage portions 6a and 6b. One folding frame 9b of the two front and rear folding frames 9a and 9b that are connected to each other and the folding frames 9a and 9b that are horizontally deployed are overlapped and fixed only to the one folding frame 9b. The vertical movement frame 8b is composed of the other folding frame 9a, and the pair of left and right intermediate wheels (direction fixed wheels 4a and 4b) are fixed to the load support base 10. mounted on the left and right sides towards the folding frame 9b may Rukoto.

  Further, as described in claim 3, springs 30a to 31b for urging the load carrier body 8 in the folding direction are provided side by side, or, as described in claim 4, the load carrier body 8 is engaged in a horizontally deployed state. Deployment state locking means 12 and 114 for stopping can be provided side by side.

In the case where the unfolding state locking means is also provided, the unfolding state locking means 114 is pivotally supported by one of the two cart portions 6b at both ends of the load support base portion 8a. The locked portion 115 provided at the free end portion on the non-side and the other cart portion 6a so as to automatically engage with the locked portion 115 when the load supporting base portion 8a becomes horizontal. It can be comprised from the provided locking tool 116 and the operation tool which carries out lock release operation of this locking tool 116. FIG. Further, in this case, as described in claim 6, the locking tool 116 is pivotally supported on the carriage portion 6a by a horizontal and horizontal support shaft 117 so as to be swingable back and forth, and is attached by a spring 119 in the locking action direction. The stepping plate 121 for swinging in the direction opposite to the direction of urging by the spring 119 is connected to the locking member 116, and the operation tool can be configured by the stepping plate 121. The

According to the transportation cart according to the present invention having the above-described configuration, the carrier body is a transportation cart that can be folded so that the center portion stands upright so that the front and rear both-end carriage parts approach each other. It is possible to form the entire load support surface when the load carrier body is in a horizontal state, and it is provided with a load support stand portion that does not have a bent joint in the middle, so that the load carrier body is in a horizontal state in which a load can be loaded. At this time, the same load support surface as the load support surface of a general transport carriage having no break in the middle can be formed by the load support base portion. In addition, the horizontal load support base part can support both ends of the load support part on the carriage part, and is excellent in stability and safety of the rigid structure of the both end support that does not have a bent joint part in the middle. It can be used as a transport cart with a cargo bed body. In addition, it becomes easy to configure a state in which an excessive stress is not applied to the shaft support portion of the vertically moving frame and the load support base portion. In addition, according to the configuration of the present invention, not only can the load carrier body in the horizontally deployed state be supported not only by the both end carriages but also by intermediate wheels, the load bearing performance can be improved, and the wheels are shown in the embodiment. In this way, it is easy to turn in the horizontal direction while improving the straightness of the transporting carriage by making the wheels of the front and rear end carriage parts free-wheeling. Can be done. Also, in this case, when the direction fixed wheel is configured to protrude slightly downward from the ground level of the free wheel at the front and rear ends of the carriage unit, and the steering operability of the carriage is improved, Since the load support base part of the cargo bed body is slightly lifted (the two front and rear folding frames 9a and 9b are bent in a mountain shape), it is desirable to use the unfolding state locking means according to claim 4 together.

In addition, although a load carrier main body can also be comprised with the load support base part which raised bending rigidity suitably, and one up-and-down moving frame, according to the structure of Claim 2, two folding frames are required front and back. The load support base, which has bending rigidity and is supported by the two front and rear folding frames, provides a load support surface of the required size. Can be configured. Moreover, the intermediate wheel can be supported by a folding frame as a strength member that only provides the necessary bending rigidity, not the load supporting surface of the required size (load supporting base), Although the structure is provided with wheels on the lower side of the intermediate part of the cargo bed body, the load support board that provides the load support surface can be configured to be lightweight and design-oriented, such as a mesh structure.

  According to the third aspect of the present invention, the load support base portion of the load carrier body can be tilted upward by at least a certain angle during the operation of folding the carrier body by the spring force. It is easier to lift the load support base than when it is necessary to lift the load support base in a completely horizontal state, and the required lifting force is less, improving workability. it can.

  Moreover, according to the structure of Claim 4, the load support base part of the load body main body of a horizontal expansion | deployment state does not shake up and down, and can carry a load stably also on an uneven | corrugated floor surface. In particular, by combining the configuration according to claim 2 and the configuration according to claim 3, even in an empty transport cart, the cargo bed main body can be reliably held in a horizontally deployed state. The stability of the cart is enhanced and it can be used safely.

  Furthermore, according to the structure of Claim 5, the structure of a deployment state latching means is simplified rather than the case where the latching action part of a deployment state latching means is arrange | positioned in the bending joint part of the center of a loading-body main body. In addition to being able to be implemented at low cost, the degree to which the vertical play of the locking action portion of the deployed state locking means affects the vertical swinging motion of the cargo bed body in the locked state is extremely small, The platform body can be locked and held in a horizontally deployed state stably and reliably. In this case, according to the structure of Claim 6, the whole structure becomes simpler than the case where the operation tool is provided separately from the locking tool and the both are interlockedly connected, and can be implemented at low cost. Moreover, according to the structure of Claim 7, while it can be stably locked to a horizontal expansion | deployment state with a single locking tool, even if comprised as described in Claim 6, Usually, the stepping plate portion of the locking tool is stepped down at an intermediate position between the pair of left and right wheels, and the unlocking operation can be easily and stably performed.

  A specific embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 3, reference numeral 1 denotes a rectangular loading platform having a long planar shape in the front-rear direction. The universal wheels 2a, 2b and 3a, 3b are provided, and the fixed direction wheels 4a, 4b whose directions are fixed in the front-rear direction are provided substantially below the center position in the front-rear direction. Reference numerals 5 a and 5 b denote side frames provided upright at both front and rear ends of the loading platform 1.

  The loading platform 1 is composed of front and rear end carriages 6a and 6b, and a front and rear end carriages 6a and 6b that are connected to each other and foldable so that a central portion stands up. The load carrier body 8 is supported by one of the front and rear carriage parts 6a, 6b so that it can be swung up and down by a horizontal support shaft 7b and does not have a bent part in the middle. 8a and a vertical movement that is supported by the other carriage portion 6a by a horizontal support shaft 7a so as to be swingable up and down, and whose free end is pivotally supported at an intermediate position in the longitudinal direction of the load support base portion 8a. Frame 8b.

  Specifically, the load carrier body 8 has two front and rear front ends that are pivotally supported on the front and rear carriages 6a and 6b by the support shafts 7a and 7b, respectively, and can be folded in a direction in which the bottom sides face each other. From the folding frames 9a and 9b and the load supporting base 10 which is superimposed on both the folding frames 9a and 9b and fixed only to the rear folding frame 9b when the folding frames 9a and 9b are in the horizontal unfolded state. It is configured. That is, the load support base portion 8a is composed of one folding frame 9b and the load support base 10 fixed to the folding frame 9b, and the vertically moving frame 8b is composed of the other folding frame 9a. Although not shown in the drawings, the load support base 10 is provided with a falling peripheral wall that hides the folding frames 9a and 9b in the periphery, and the whole can be made into a mesh structure. It may have any structure.

  The transporting carriage includes the interlocking opening / closing means 11, the unfolded state locking means 12, and the folded state locking means 13. The interlocking opening / closing means 11 includes two sets of front and rear parallel link mechanisms 14 a and 14 b and a gear train 15. As shown in FIGS. 2 and 4, the two sets of front and rear parallel link mechanisms 14a and 14b have a front-rear symmetrical structure, and the front and rear end carriages 6a and 6b are connected to the outer vertical links and folding frames 9a and 9b. The upper vertical movement link, the common vertical link 16 that pivotally supports the inner ends of the folding frames 9a and 9b, and the front and rear carriage units 6a and 6b and the common vertical link 16 below the folding frames 9a and 9b. It is composed of lower vertical movement links 17a and 17b interposed therebetween.

  The front and rear end carriages 6a and 6b have a symmetrical structure with respect to each other. The left and right horizontal frame 18 and the front and rear horizontal frames that are connected to the left and right ends of the left and right horizontal frame 18 and protrude horizontally inward. 19 and a vertical frame 20 fixed substantially at the center inside the left and right horizontal frame 18 are U-shaped, and the left and right protruding corners are made of an elastic material or the like. An L-shaped bumper member 21 is attached. Further, on the front and rear end carriages 6a and 6b, a rectangular tube-like support part 22 for supporting a pair of left and right side frames is projected, and each side frame 5a and 5b has a pair of left and right leg posts. The structure is inserted into the rectangular tube-like support portion 22 on each of the cart portions 6a and 6b, and is supported in a vertically standing state. In addition, a pair of left and right bearing plates 23 project upwardly at positions along the inner sides of the left and right front and rear horizontal frames 19 on the front and rear end carriage parts 6a and 6b.

  Each of the folding frames 9a and 9b is formed by continuously connecting outer left and right horizontal members 25 and 28 and inner left and right horizontal members 26 and 29 protruding in the left and right sides in a T shape at both ends in the length direction of the main bodies 24 and 27. The left and right horizontal member 25 on the outer side of the front folding frame 9a is inserted into the pair of left and right bearing plates 23 of the front end carriage portion 6a and the vertical frame 20 located between them in the horizontal direction in the support shaft 7a. The left and right horizontally facing members 28 of the rear folding frame 9b are pivotally supported so as to be swingable up and down, and the left and right horizontally facing members 28 of the rear end cart portion 6b are moved to the left and right bearing plates 23 and the vertically oriented frame 20 positioned between them. The support shaft 7b that penetrates in the horizontal direction is pivotally supported so as to swing up and down. The support shafts 7a and 7b are respectively provided with folding frames 9a and 9b on the left and right sides of the vertical orientation frame 20, respectively. Coil springs 30a torsion to bias can, 30b and 31a, 31b are loosely fitted.

  As shown in FIGS. 4 and 9, the gear train 15 includes a pair of left and right spur gears 34 concentrically attached to the inner left-right horizontal orientation member 26 of the front folding frame 9a, and the inner left-right horizontal of the rear folding frame 9b. It consists of a pair of left and right spur gears 35 concentrically attached to the orientation member 29. Each spur gear 34, 35 is a plate material attached to each of the left and right horizontally orientation members 26, 29 at one end bent into an L shape. A tooth row is formed only on the arcuate side of the other end side of 34a, 35a.

  The common vertical orientation link 16 has an upper left and right side plate part 36 and a lower left and right side plate part 37, and a pair of left and right folding frames 9a and 9b are adjacent to the inside of the upper left and right side plate part 36. The spur gears 34 and 35 are pivotally supported by left and right horizontal support shafts 38 a and 38 b so that they mesh with each other, and the respective folding frames 9 a and 9 b are arranged around the support shafts 38 a and 38 b with respect to the common vertical link 16. The upper and lower parts are configured to swing in conjunction with each other in opposite directions. 39a and 39b are cover materials that individually cover the upper sides of the two sets of left and right spur gears 34 and 35 that mesh with each other, and the two support shafts 38a and 38b penetrate the support shafts 38a and 38b, respectively. The support shafts 38a and 38b are positioned with respect to each other by being fitted so as to sandwich the upper sides of the front and rear spur gears 34 and 35 that are supported by the front and back 38b.

  The lower vertical movement links 17a and 17b are bar-shaped narrower than the main bodies 24 and 27 of the folding frames 9a and 9b, and are positioned directly below the main bodies 24 and 27 of the folding frames 9a and 9b. The inner end is pivotally supported by left and right horizontal support shafts 40a and 40b between the lower left and right side plate portions 37 of the common vertical link 16, and the outer end of each of the front and rear end carriage portions 6a and 6b. It is pivotally supported at the lower end of the vertical frame 20 by horizontal and horizontal horizontal support shafts 41a and 41b.

  The unfolding state locking means 12 is a pair of left and right pairs whose outer ends are pivotally supported by left and right horizontal support shafts 42a and 42b on the left and right sides of the main bodies 24 and 27 at intermediate positions in the length direction of the folding frames 9a and 9b. The links 43a and 43b, the horizontal support shaft 44 horizontally connecting the inner ends of the links 43a and 43b, and the lower left and right side plates 37 of the common vertical link 16 are cut upward from the lower ends. It is disposed between the engaged portion 45 formed of a notched vertical groove and the lower left and right side plate portions 37 and is pivotally supported on the lower left and right side plate portions 37 by horizontal support shafts 47. A locking device 46 of an automatic locking system and a torsion coil spring 48 that is loosely fitted on the support shaft 47 and biases the locking device 46 in the locking action direction are provided. And links 43a and 4 excluding related members. b, it is also configured bracing means by a common support shaft 44, and the engaged portion 45.

  As shown in FIGS. 4, 7, and 8, the folded state locking means 13 is configured so that the support shaft 41a that supports the lower vertical movement link 17a at the lower end of the vertically oriented frame 20 of the front end carriage portion 6a is provided on both the left and right sides. A pair of left and right engaged portions 49a, 49b configured to extend to the left and right sides of a support shaft 41b that pivotally supports the lower vertical movement link 17b at the lower end of the vertically oriented frame 20 of the rear end carriage portion 6b. A pair of left and right automatic locking type locking tools 51a and 51b each provided with an engaging recess 50 on the lower side of the front end portion that is pivotally supported at the end and extends in the direction of the front end carriage portion 6a. Between the stepping operation tool 52 composed of a horizontal horizontal member that connects and integrates the rear ends of the pair of locking tools 51a and 51b to each other, and the lower vertical movement link 17b and the locking tools 51a and 51b. Thus, it is loosely fitted to the support shaft 41b and the locking tools 51a, And a pair of left and right torsion coil springs 54a and 54b that are biased and held in a substantially horizontal locking posture that is restrained by the stopper 53, and a stopper 55 that restricts the upper limit position of the locking tools 51a and 51b (one side (Acting only on the locking tool 51a).

  As shown in FIG. 2, the inner left / right horizontal member 29 of the rear folding frame 9b extends to the left and right sides of the inner left / right horizontal member 26 of the front folding frame 9a. Oriented fixed wheels 4a and 4b are attached to the lower sides of the left and right ends of the member 29 through wheel mounting bases 56a and 56b as shown in FIG. Further, as shown in FIGS. 5, 6, and 9, the inner ends of the two front and rear folding frames 9a and 9b are fitted to each other when the both folding frames 9a and 9b are in a horizontally developed state. In addition, fitting portions 57 and 58 are provided for preventing the folding frames 9a and 9b from moving beyond the horizontally deployed state. In the embodiment, the fitting portion 57 of the front folding frame 9a is a protruding fitting portion that is configured by a protruding body that protrudes rearward from the center position in the left-right width direction of the inner left-right horizontal orientation member 26. The fitting portion 58 of the folding frame 9b is a concave fitting portion into which the protruding fitting portion 57 is fitted, and is the center in the left-right width direction of the inner left / right horizontal member 29 of the rear folding frame 9b. It is comprised from the channel-shaped material 59 attached to the position lower side.

  Thus, the protrusion-like fitting portion 57 has the upper end corner at an angle in the side view so that it can enter without interfering with the inner left / right horizontal member 29 of the rear folding frame 9b on the other side. It is configured in a cut shape. Further, as shown in FIG. 6, when the projecting fitting part 57 and the recessed fitting part 58 are fitted to each other and the two front and rear folding frames 9a and 9b are in a horizontally developed state, both the folding frames 9a and 9b The top surfaces of the inner left and right horizontal members 26 and 29 of the inner side 9b are adjacent to each other at the same level in the front and rear, and the upper horizontal plate portion of the inner left and right horizontal member 29 of the rear folding frame 9b is a protruding shape of the front folding frame 9b. It overlaps on the fitting part 57.

  As shown in FIGS. 4 to 7, the locking tool 46 of the unfolded state locking means 12 is interlocked and connected by the stepping operation tool 52 of the folded state locking means 13 and the release wire 60. When the stepping operation tool 52 is stepped down to swing the locking tools 51a and 51b upward to switch to the unlocking posture shown by the phantom line in FIG. Is transmitted to the locking tool 46 of the deployed state locking means 12, and the locking tool 46 is rotated against the torsion coil spring 48 to be switched to the unlocking posture. Yes. That is, the unfolding of the unfolded state locking means 12 and the unlocking of the folded state locking means 13 can be performed by a single stepping operation tool 52.

  As shown in FIG. 1, the pair of front and rear side frames 5 a and 5 b are constructed by laying cross beams 62 in a plurality of upper and lower stages between a pair of left and right vertical columns 61. A leg post portion 61a is formed to be bent inwardly and to be inserted into the pair of left and right square cylindrical support portions 22 of the front and rear carriages 6a, 6b.

  An example of the mounting structure of each of the side frames 5a and 5b will be described with reference to FIG. 10. The pair of left and right square cylindrical support portions 22 of the front and rear end carriage portions 6a and 6b are arranged on the inner and outer sides of the left and right side walls. A wedge-shaped recessed portion 63 that is narrowed from the upper end of the side wall is formed, and the lower end opening of the pair of left and right rectangular tube-shaped support portions 22 on the front end carriage portion 6a is lower in a side view like the wedge-shaped recessed portion 63. A narrowed V-shaped plate material 64 is fixed, and a plate material 66 having a bolt hole 65 in the center is fixed to the lower end openings of the pair of left and right square cylindrical support portions 22 on the rear end carriage portion 6b. Yes.

  On the other hand, in the both leg pillar portions 61a of the front side frame 5a, the lower end is inserted into the pair of left and right square cylindrical support portions 22 on the front end carriage portion 6a and slightly protrudes downward from the square cylindrical support portion 22. When the front and rear corners 61b (see FIG. 10C) are centered and received on the inner slope of the V-shaped plate member 64 with respect to the front and rear direction, they are fitted into the wedge-shaped recess 63 of the square cylindrical support portion 22 and the inner slope thereof. A wedge-shaped plate-like protrusion 67 having a constriction that is centered in the front-rear direction and is received is attached. A plate nut 69 having a screw hole 68 penetrating in the vertical direction is fixed to both leg pillar portions 61a of the rear side frame 5b, and the both leg pillar portions 61a are attached to the rear end carriage portion 6b. When the plate nut 69 is inserted into the pair of left and right square tubular support portions 22 and reaches a depth slightly above the plate material 66 at the lower end of the square tubular support portion 22, the square tubular support portion 22. A wedge-shaped plate-like projection 70 having a narrowed shape is attached to the wedge-shaped recessed portion 63 and centered in the front-rear direction on the inner slope.

  Thus, the side frame 5a on the front side can freely insert and remove the pedestal 61a with respect to the pair of left and right rectangular tube-shaped support portions 22 on the front end cart portion 6a. Since the center is centered in the front-rear direction at the two upper and lower ends of the shape support portion 22, it can be supported without play in the front-rear direction. Further, the rear side frame 5b is a bolt 71 inserted upward into the bolt hole 65 in a state where the leg pillar portion 61a is inserted into the pair of left and right square cylindrical support portions 22 on the rear end carriage portion 6b. Is screwed and fastened to the screw hole 68 at the lower end of the pedestal 61a, whereby the lower end side of the rectangular tube-shaped support portion 22 is positioned at a fixed position by bolting, and the upper end side of the rectangular tube-shaped support portion 22 is wedge-shaped. Since it is centered in the front-rear direction by fitting the recessed portion 63 and the wedge-shaped plate-like protrusion 70, it can be firmly supported without backlash in the front-rear direction while being bolted at one location on the lower end side. The rear side frame 5b can be extracted by loosening the bolt 71 as required.

  In this embodiment, the front side frame 5a has a structure that can be freely inserted and removed, and the rear side frame 5b, that is, a stepping pedal that is an operation tool for unlocking the unfolded state locking means 12 and the folded state locking means 13 is used. The side frame 5b on the rear end carriage part 6b side including the operation tool 52 is bolted. According to this configuration, when the stepping operation tool 52 is operated, the unlocking operation can be stably performed in a state where the side frame 5b firmly attached by bolting is gripped. Accordingly, as shown in FIGS. 1 and 2, the operation means 79 of the braking device for the fixed direction wheels 4a and 4b (the detailed description is omitted, but the fixed direction wheels 4a and 4b are switched between a braking state and a braking release state. When a foot operation tool is provided, it is desirable to dispose the operation means 79 on the cart portion 6b on the side frame 5b side which is firmly attached by bolting.

  As shown in phantom lines in FIG. 2, the operation means 79 of the braking device for the orientation-fixed wheels 4 a and 4 b is provided with an unlocking stepping operation tool 52 for the unfolded state locking means 12 and the folded state locking means 13. In the case of sorting and arranging on the front end cart portion 6a instead of the provided rear end cart portion 6b, both the front and rear side frames 5a and 5b can be bolted. In this case, when it is necessary to provide the unlocking operation tool on the front end cart portion 6a side by the configuration of the unlocking stepping operation tool 52 of the deployed state locking means 12 and the folded state locking means 13, The operation means 79 of the braking device for the direction fixed wheels 4a and 4b may be provided on the rear end carriage unit 6b side.

  Both the front and rear side frames 5a and 5b can be bolted regardless of the arrangement relationship with the operation means 79 or the stepping operation tool 52. If there is no particular problem, the front and rear side frames 5a and 5b can be It is also possible to provide a support structure that can be freely inserted and removed.

  Describing how to use the transportation cart having the above-described configuration, as shown in FIG. 6, in the state where the loading body 8 is horizontally deployed as shown in FIG. 1 and this transportation cart is used for transporting loads, A common support shaft 44 between the links 43a and 43b that has entered into the engaged portion 45 of the deployed state locking means 12 is locked in the engaged portion 45 by a locking tool 46. Since the space between the inner ends of the two folding frames 9a and 9b (support shafts 38a and 38b between the common vertical link 16) and the common support shaft 44 is prevented, a load support base is provided. Even if an upward external force is applied to 10, the two front and rear folding frames 9 a and 9 b are not bent upward and the load supporting base 10 does not tilt.

  Thus, the transport cart can be pushed or pulled with any one of the side frames 5a and 5b as a handle. Since the pair of orientation-fixed wheels 4a and 4b are in contact with the ground, the forward / rearward straightness is high, the vehicle can run without wobbling in the lateral direction, and when turning in the lateral direction, A transport cart that is long in the front-rear direction can be easily turned around the center position between the fixed orientation wheels 4a and 4b as a fulcrum. In order to reliably obtain this action, it is desirable to attach the fixed wheel so that it protrudes slightly downward from the common ground level of the free wheels 2a to 3b. When the direction fixing wheels 4a and 4b are provided with braking means, the direction fixing wheels 4a and 4b can be braked and stopped stably when necessary by the operation means 79. .

  Further, due to the presence of the steadying means constituted by the links 43a and 43b, the common support shaft 44, and the engaged portion 45 excluding the locking tool 46 and its related members of the deployed state locking means 12, the locking is achieved. Regardless of the locking action of the common support shaft 44 by the tool 46, the transportation carriage can be prevented from swinging back and forth. That is, when the cargo bed main body 8 is in the horizontal unfolded state, the common support shaft 44 between the links 43a and 43b enters the engaged portion 45, and the two sets of front and rear parallel link mechanisms 14a and 14b are moved in the front-rear direction. Since the lattice structure portion that prevents the buckling deformation motion is formed, when one of the side frames 5a and 5b is pushed or pulled in order to run the transport carriage, the two sets of parallel link mechanisms 14a in the front and rear directions are provided. , 14b with the back-and-forth buckling deformation motion, the swinging motion in which the side frames 5a and 5b tilt in the operation direction is eliminated or lightened.

  Further, when the two front and rear folding frames 9a and 9b are in the horizontal unfolded state, as shown in FIG. 6, the protruding fitting portion 57 at the inner end of the front folding frame 9a and the rear folding frame 9b. Are connected to each other, and the upper horizontal plate portion (the upper component plate of the recessed fitting portion 58) of the inner left-right horizontal member 29 of the rear folding frame 9b. Since it overlaps on the protrusion-like fitting part 57 of the front folding frame 9b and the folding frames 9a and 9b at the front and rear are prevented from bending downward beyond the horizontally developed state, for example, weight Even when an excessive load is applied to the center part of the cargo bed body 8 (load support base 10), such as when an object is loaded so as to drop on the center part of the bed body body 8 (load support base 10) in a horizontally deployed state, Deployment state locking means 12 Unreasonable load on a common vertical orientation link 16 to form the engaged portion 45 and the common shaft 44 which is fitted a engaged portion can be prevented from acting.

  As shown in FIG. 3, when loading on a cargo bed of a transport cart that is not used or storing it in a limited space, as shown in FIG. 3, the cargo bed body 8 is folded into an inverted V shape so that the front and rear carriage portions 6 a and 6 b are The folded state can be made adjacent to each other. That is, the stepping operation tool 52 of the folded state locking means 13 shown in FIG. 7 (the idle state when the cargo bed body 8 is in the horizontal unfolded state) is stepped down, and the operating force at that time is shown in FIG. Is transmitted to the locking tool 46 of the deployed state locking means 12 shown, and the locking tool 46 is rotated against the torsion coil spring 48 in the locking release direction, so that it is common to the engaged portion 45. Since the downward movement and escape of the support shaft 44 are free, as shown in FIG. 4, the torsion coil springs 30a to 31b between the two front and rear folding frames 9a and 9b and the front and rear carriages 6a and 6b. Each of the urging forces rotates upward.

  The upward rotation of the two front and rear folding frames 9a and 9b stops in a state where the urging forces of the torsion coil springs 30a to 31b and the gravity acting on the cargo bed body 8 are balanced, and thereafter the rear side So as to be lifted from the front folding frame 9a by being tilted together with the folding frame 9b and lifted up by the free end side of the load supporting base 10 or to bring the front and rear carriages 6a, 6b closer to each other. By operating, for example, as shown in FIG. 3, the two front and rear folding frames 9a and 9b) are folded and raised, and the front and rear carriages 6a and 6b are adjacent to each other.

  During the folding operation of the cargo bed body 8 described above, the two sets of front and rear parallel link mechanisms 14a and 14b and the gear train 15 of the interlocking opening / closing means 11 are arranged on the front and rear carriages 6a and 6b, and the side frames 5a and 5b are placed on the floor. On the other hand, the two front and rear folding frames 9a and 9b are interlocked and opened in a bilaterally symmetrical manner while being held in a fixed posture standing upright. That is, due to the presence of two sets of front and rear spur gears 34 and 35 of the gear train 15 fixed to the folding frames 9a and 9b and meshing with each other, both the folding frames 9a and 9b are mutually connected with respect to the common vertical link 16. The common vertical link 16 is a common vertical link member located between the two front and rear parallel link mechanisms 14a and 14b, and is capable of interlocking rotation in the opposite direction by an equal angle. Since the three parts of the front and rear end carriages 6a and 6b and the common vertical link 16 which are vertical link members on the outside of 14a and 14b can only move in parallel with each other, the free wheels 2a to 3b respectively can be used on the floor surface. The front and rear carriages 6a and 6b supported by the vehicle can move toward and away from each other in the front-rear direction while maintaining a fixed posture in which the side frames 5a and 5b are perpendicular to the floor surface. It is kill the.

  As shown in FIG. 3, when the cargo bed main body 8 (the two front and rear folding frames 9a and 9b) is folded and raised and the front and rear carriages 6a and 6b are adjacent to each other, as shown in FIG. The engaging recesses 50 of the locking tools 51a and 51b on the rear end carriage part 6b side in the stopping means 13 are twisted into the engaged parts 49a and 49b (both ends of the support shaft 41a) on the front end carriage part 6a side. 54a and 54b (see FIG. 8) are automatically engaged, and the transport carriage is locked in the folded state shown in FIG. At this time, a pulling force acts on the release wire 60 in the same manner as when the stepping operation tool 52 is stepped down. However, since the unfolded state locking means 12 interlocked with the release wire 60 is idle, the influence is Absent.

  FIG. 11 shows another embodiment of the folded state locking means. The folded state locking means 100 is pivotally supported by the front end carriage portion 6a using a support shaft 41a that pivotally supports the lower vertical movement link 17a, and has an engagement recess 101 on the upper end portion. And a torsion coil spring 103 that urges the locking device 102 upward, and a left-right horizontal support on the front end carriage 6a at a position obliquely forward and upward relative to the locking device 102. An unlocking operation tool 107 supported by a torsion coil spring 106 at a position supported by a shaft 104 so as to be stepped down by a shaft 104 and restrained by a stopper 105, the operation tool 107 and the locking tool It is comprised from the link 108 of the up-down direction which interlocks and connects 102. The link 108 is supported by a lever portion 107b whose upper end extends rearward from the support shaft 104 of the operation tool 107 by a left and right support shaft 109, and a long hole 110 in the link length direction is formed on the lower end side. And a horizontal support shaft 111 provided in a lever portion 102 a extending forward from the support shaft 41 a of the locking tool 102 is engaged with the elongated hole 110. The unlocking operation tool 107 is provided with a stepping plate portion 107a at its upper end so that the stepping operation can be performed.

  Thus, when the two front and rear folding frames 9a and 9b are folded and the front and rear end carriage parts 6a and 6b are brought close to and adjacent to each other, the locking member 102 has the lower vertical movement link 17b on the rear end carriage part 6b. The engagement concave portion 101 is automatically engaged with the engaged portion 112 configured by using the support shaft 41b that supports the shaft, and the front and rear carriage units 6a and 6b are prevented from moving apart from each other. That is, the cargo bed body 8 can be locked in the folded state. The movement of the locking tool 102 during the automatic locking operation is not transmitted to the stepping operation tool 107 due to the free movement of the support shaft 111 in the long hole 110. When releasing the folded state of the cargo bed body 8, the operation tool 107 is twisted down against the coil spring 106, and the locking tool 102 is twisted against the coil spring 103 via the link 108. What is necessary is just to rotate the joint recessed part 101 in the direction which detaches | leaves from the to-be-engaged part 112 below.

  The above-described locking release operation tool 107 has a locking tool 46 (see FIG. 4) of the deployment state locking means 12 in order to release the locking of the deployment state locking means 12 in the above embodiment by the step-down operation. The release wire 60 connected to the operation tool 107 is connected to the operation tool 107, and both of them are connected to each other. In this case, in order to shorten the entire length of the release wire 60, the direction of the locking tool 46 (see FIG. 4) of the deployed state locking means 12 may be reversed, and the locking release operation tool 107 is included. The folded state locking means 100 may be provided on the rear end cart portion 6b side like the folded state locking means 13 of the previous embodiment.

  FIG. 12 shows another embodiment of the unfolded state locking means combined with the folded state locking means 100 shown in FIG. This unfolded state locking means 114 is an engaged portion 115 (for example, the wire rod is formed into a U-shape in a planar shape) protruding from the free end portion of the load support base 10 on the side not fixed to the folding frame 9b. And a locking tool provided at the same position in place of the locking release operating tool 107 of the folded state locking means 100 shown in FIG. 116. The locking tool 116 is supported horizontally on the front end cart portion 6a so that the locking tool 102 of the folded locking means 100 is positioned on the inner side (rear) in the front-rear direction below the locking tool 116. It is supported by a torsion coil spring 119 at a position that is pivotally supported by 117 and restrained by a stopper 118, and is automatically engaged with the engaged portion 115 on one side thereof. A mating recess 120 is formed.

  In addition, the upper end of the locking member 116 is integrally provided with a foot plate 121 for turning and rotating against the coil spring 119 in a direction in which the engaging recess 120 is detached from the engaged portion 115. The stepping plate portion 121 is provided in series and constitutes an unlocking operation tool for the unfolded state locking means 114. Further, in order to interlock the locking tool 116 and the locking tool 102 of the folded state locking means 100 so that both of them are simultaneously unlocked, the engagement of the folded state locking means 100 shown in FIG. The same interlocking mechanism as the interlocking mechanism between the stopper 102 and the unlocking operation tool 107 is incorporated as shown in the figure. Reference numeral 116 a denotes a lever portion that extends rearward from the support shaft 117 in order to support the link 108 with the support shaft 122.

  According to the above configuration, the locking tool 116 of the unfolded state locking means 114 is connected to the unlocking operation tool of the unfolded state locking means 114 and the unlocking operation tool of the folded state locking means 100. It will be combined. Therefore, in the state in which the cargo bed body 8 is folded, the stepping plate portion 121 of the locking tool 116 is stepped down to cause the locking tool 102 of the folded state locking means 100 to be unlocked via the link 108. And can be unlocked in the folded state. Then, the folded front and rear folding frames 9a and 9b are unfolded in a horizontally developed state, and the free end portion of the load supporting base 10 fixed on one folding frame 9b is placed on the front end carriage portion 6a. When the load support base 10 is pushed down against the torsion coil springs 30a to 31b (see FIGS. 2 and 4), the engaged portion 115 of the free end portion of the load support base 10 is in a deployed state. It automatically engages with the engaging recess 120 of the locking member 116 of the locking means 114, and the load support base 10 (the two front and rear folding frames 9a and 9b) is locked in the horizontally deployed state. At the time of the automatic locking operation of the locking tool 116 at this time, the locking tool 102 of the folded state locking means 100 in the play state is also temporarily rotated in the unlocking direction (downward) via the link 108. .

  In addition, although the load carrier body 8 is configured by three members of the front and rear folding frames 9a and 9b and the load support table 10, the load support table 10 is basically configured to have a necessary bending strength, One end of the load support base 10 is pivotally supported on one cart portion 6b so as to be swingable up and down, and a folding frame 9a is interposed between the intermediate position of the load support stand 10 and the other cart portion 6a. The folding frame 9b can also be omitted. In other words, the cargo bed body 8 can also be configured by one load support base 10 (load support base portion 8a) and one vertical movement frame 8b (folding frame 9a).

  Further, the interlocking opening / closing means 11 and the folded state locking means 13, 100 are not essential to the present invention. In particular, when the folded loading platform 1 naturally expands due to gravity, the folded loading platform 1 can be folded without the special folded state locking means 13 and 100 as shown in the above embodiment. What is necessary is just to bind the loading-body main body 8 of the state folded with the rubber band or the string-like thing so that the loading platform 1 may not expand | deploy unexpectedly.

  Furthermore, torsion coil springs interposed between the load support base portion 8a and the cart portion 6b and between the vertical movement frame 8b and the cart portion 6a as springs for urging the load carrier body 8 in the folding direction. 30a to 31b are used, but a spring can be interposed between the load support base 8a and the vertically moving frame 8b (between both folding frames 9a and 9b), or a spring can be interposed between both. it can. Of course, when the cargo bed main body 8 can be configured to be sufficiently light because the size of the cargo bed main body 8 is small, the spring can be basically omitted.

The number and mounting positions of the orientation fixing wheels 4a and 4b are not limited to those in the above embodiment. For example, a fixed direction wheel can be attached to the load support base 10 having the required strength, and when the vertical link members constituting the parallel link mechanisms 14a and 14b are divided into left and right sides, the fixed direction is fixed. It is also possible to provide the wheel at the center position of the left and right lateral width of the cargo bed body 8. In addition, it is common that the fixed direction wheels are mounted so as to protrude slightly below the common ground level of the universal wheels 2a to 3b, and the center portion of the cargo bed body 8 is slightly lifted by the fixed direction wheels. However, you may comprise so that it may have the same ground level as the common ground level of the universal wheels 2a-3b. Of course, it may be a direction-fixed wheel having no braking means.

  Further, the deployed state locking means 12 and 114 are basically not essential to the present invention. In particular, the front and rear end carriages 6a and 6b are configured so that the center part of the cargo bed body 8 is not lifted slightly by the fixed-orientation wheels and the cargo bed body 8 is in a horizontally deployed state as in the structure of the present invention. When using the load support base part 8a (the load support base 10 and the one folding frame 9b) which is supported at both the front and rear ends and is not itself a folding structure, it is not necessary to use the deployment state locking means together. The cargo bed body 8 can be used stably in a horizontally deployed state.

Fig. A is a side view of a transport cart with the loading platform body in a horizontally deployed state, Fig. B is the same front view, and Fig. C is the rear view. It is a top view which shows the loading platform in the state which omitted the loading support platform. It is a side view of the trolley | bogie for conveyance in the state which folded the loading-body main body. It is a partial vertical side view explaining an interlocking opening / closing means. It is a vertical side view which shows the principal part of FIG. It is a vertical side view which shows the principal part of FIG. 4 when a loading-body main body exists in a horizontal expansion | deployment state. FIG. 4 is a partially longitudinal side view of the main part of FIG. 3. It is a top view explaining a folding state latching means. It is a center part vertical front view in the state where the load support stand of Drawing 1A was omitted. It is principal part drawing which shows the support structure of the front and back both sides | frames, Comprising: A figure is a partially longitudinal front view which shows the state before attachment of a front side frame, B figure shows the state after attachment of a front side frame. C is a partially enlarged rear view showing a state before the rear side frame is attached, and FIG. E is a state after the rear side frame is attached. FIG. It is a partially vertical side view which shows another embodiment of a folding state latching means. It is a partial longitudinal cross-sectional side view which shows another embodiment of a folding state latching means and a deployment state latching means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Loading platform 2a-3b Swivel wheel 4a, 4b Orientation fixed wheel 5a, 5b Side frame 6a, 6b Front and rear both-end trolley part 8 Loading platform main body 8a Loading support base part 8b Folding frame 9a, 9b Folding frame 10 Load support base 11 Interlocking opening / closing means 12, 114 Expanded state locking means 13, 100 Folded state locking means 14a, 14b Parallel link mechanism 15 Gear train 16 Common vertical direction links 17a, 17b Lower vertical movement links 30a-31b, 48, 54a, 54b, 103, 106, 119 Torsion coil springs 34, 35 Spur gears 43a, 43b Expanded state locking means link 44 Common support shaft 45 Engaged part (vertical concave groove)
46, 51a, 51, 102, 116 Automatic locking type locking tools 49a, 49b, 112, 115 Engaged portions 50, 101, 120 Engaging recesses 52, 107 Unlocking operation tool (stepping operation tool)
57 Protruding fitting portion 58 Recessed fitting portion 60 Release wire 79 Operating means 107a, 121 of foot brake plate for a fixed-direction wheel

Claims (7)

The loading platform is configured to be foldable so that the front and rear end carriages each having a wheel and the front and rear end carriages are connected to each other and the central part rises so that the front and rear carriages are close to each other. A carrier truck comprising a main body, wherein the cargo bed body is pivotally supported by one of the two front and rear carriage parts so as to be swingable up and down, and has no bent part in the middle; And a vertically moving frame interposed between the intermediate position in the longitudinal direction of the load support base portion and the other cart portion, and the load support base portion has an intermediate position in the longitudinal direction thereof. A pair of left and right intermediate wheels that are grounded when the cargo bed main body is in a horizontally deployed state are attached to the left and right sides of the vertical movement frame at a position, and in the folded state of the cargo bed main body, the load support base portion 8a in an upright state Lower half and above And the dynamic frame 8b is configured so as to be adjacent to each other, dolly. The load support base is overlaid on one of two front and rear folding frames that are foldably connected so that a central portion stands between the front and rear end carriages, and on both folding frames in a horizontally unfolded state, and wherein is composed of a one of the folding load support stand only fixed to the frame, the vertical movement frame is constituted by other side of the folding frame, the pair of right and left intermediate wheel, towards said load support stand is fixed The transport cart according to claim 1, which is attached to both the left and right sides of the folding frame .   The carriage according to claim 1, further comprising a spring that urges the loading body in the folding direction. Wherein the loading platform body deployed state locking means for locking in the horizontal deployed condition are juxtaposed, dolly according to any one of claims 1 to 3.   The unfolding state locking means includes: a locked portion provided at a free end portion on the side not pivotally supported by one of the cart portions of the both ends of the load support platform portion; It is comprised from the latch provided in the other trolley | bogie part so that it may automatically engage with the said to-be-latched part when it will be in an unfolded state, and the operation tool which carries out latch release operation of this latch. The carriage for transportation according to claim 4.   The locking tool is pivotally supported on the carriage part by a horizontal and horizontal support shaft so as to be able to swing back and forth, and is biased by a spring in a locking action direction. What is the biasing direction by the spring? The transport carriage according to claim 5, wherein a foot board portion for swinging in the reverse direction is provided continuously, and the operation tool is configured by the foot board portion.   The transporting carriage according to claim 5 or 6, wherein the locked portion protrudes at a substantially central position in the left-right width direction of the free end portion of the load supporting base portion.