JP4257522B2 - 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 cargo bed body that is foldable so that a central portion rises in order to bring the cart portions close to each other.
Japanese Utility Model Publication No. 54-11651 Japanese Utility Model Publication No. 64-28362

  As described above, in order to bring the front and rear end carriage parts close to and adjacent to each other, the carrier truck that connects the front and rear end carriage parts to each other so that the center part can be folded up is folded up. Sometimes it is possible to prevent the front and rear end carriages from tilting relatively horizontally in plan view due to the presence of a cargo bed main body that connects the front and rear end carriages to each other. In the configuration, in the process of folding the cargo bed main body, the front and rear end carriage parts can be freely tilted in the front-rear direction around the fulcrum between the cargo bed main body. Cannot be maintained in a steady posture upright on the floor surface, and the front and rear carriages cannot be moved closer to each other safely and easily.

  On the other hand, in the configuration of the transporting carriage shown in Patent Document 2, an interlocking mechanism that interlocks and opens symmetrically with each other in a state where the front and rear end carriages are held in a fixed posture is provided. Is provided in a side panel shape above the cargo bed main body on both the left and right sides, so that the periphery of the cargo bed main body is surrounded by the side panel-like interlocking mechanism and the side frames rising from the front and rear carriages. It cannot be implemented as a transport cart that is a transport cart that is open on the left and right sides of the main body, that is, a type of transport cart that allows loading and unloading from the side.

  Therefore, it is conceivable to form two sets of front and rear parallel link mechanisms using the front and rear folding frames constituting the cargo bed main body and the lower vertical movement link arranged below the front and rear folding links. When the frame (cargo body) is folded, the parallel link mechanism including the two front and rear folding frames and the lower vertical link is erected almost vertically. The problem is that the cargo bed body that is folded and standing is unstable in the front-rear direction and easily swings in the front-rear direction.

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. Is composed of front and rear end carriages 6a and 6b each provided with wheels 2a to 3b, and a front and rear carriage parts 6a and 6b connected to each other and foldable. Are provided with two front and rear folding frames 9a and 9b connected to each other so that the bottom sides can be folded in a direction facing each other, and two front and rear parallel link mechanisms 14a and 14b. The front and rear carriages 6a, 6b, the two folding frames 9a, 9b, the common vertical link 16 on which the inner ends of the folding frames 9a, 9b are pivotally supported, One of the folding frame 9a, a common vertical orientation link 16 the front and rear end bogie portion 6a in the lower 9b, the lower vertical movement links 17a interposed between 6b, is composed of a 17b, one of the parallel link mechanism 14a The link equivalent axis 16a connecting the support shaft 38a supporting the folding frame 9a to the common vertical link 16 and the support shaft 40a supporting the lower vertical movement link 17a to the common vertical link 16, and the other parallel link In the mechanism 14b, a link equivalent axis 16b connecting the support shaft 38b that supports the folding frame 9b to the common vertical link 16 and the support shaft 40b that supports the lower vertical movement link 17b to the common vertical link 16 When the two folding frames 9a and 9b are viewed from the left and right lateral directions, they are configured to intersect in an X shape .

To implement the present invention with the above-described configuration, specifically, as described in claim 2, the two folding frames 9a and 9b are moved left and right with the front and rear carriages 6a and 6b held in a fixed posture. An interlocking opening / closing means 11 that opens and closes symmetrically can be provided. The interlocking opening / closing means 11 can be constituted by the two sets of parallel link mechanisms 14 a and 14 b and the gear train 15 . In this case, as described in claim 3, the gear train 15 includes two parallel support shafts 38 a and 38 b that support the inner end sides of the two folding frames 9 a and 9 b on the common vertical link 16. It can be composed of spur gears 34 and 35 concentrically engaged with each other and fixed to each folding frame.

Further, as described in the fourth aspect, the steadying means 50 for the two folding frames 9a and 9b in the horizontally developed state can be provided. This steadying means 50 has two front and rear links whose outer ends are pivotally supported at intermediate positions in the length direction of the two folding frames 9 a and 9 b and whose inner ends are pivotally supported by a common pivot 53. 52a, 52b and a vertically engaged portion 54 provided on the common vertical link 16, and the common support shaft 53 when the two folding frames 9a, 9b are in a horizontally developed state. Can be configured to engage with the engaged portion 54 and restrict the position of the common support shaft 53 in the front-rear direction .

According to the transport carriage according to the present invention having the above-described configuration, the floor area of the transport truck that is not in use is greatly increased by folding the cargo bed body and moving the front and rear end carriage parts close to each other. Although it is possible to shrink, in the folded state, the common vertical orientation link end of the lower vertical movement link the two sets of parallel link mechanisms longitudinal comprising two folding frames before and after composing the loading platform body, the Since the two front and rear folding frames can be crossed when viewed from the left and right lateral directions , these two sets of front and rear are compared to the case where the two front and rear folding frames do not cross like the common vertical link side end. Ru can be gentler inclination angle with respect to the horizontal plane of the lower vertical movement link of the parallel link mechanism. Therefore, when two front and rear folding frames (loading body) are folded, the opposing force is increased when an external force in the front-rear direction acts on the upper end (common vertical link), resulting from play at each fulcrum of the link. This reduces the back-and-forth swing motion and improves stability and safety in the folded state.

  According to the configuration of claim 2, when the cargo bed body is folded and moved so that the front and rear end carriage parts are adjacent to each other, the front and rear end carriage parts tilt relatively horizontally in plan view. The front and rear end carriages are tilted relative to each other in the front-rear direction in a side view. This means that the two front and rear folding frames included in the carriage base can be connected to each other with the front and rear end carriages held in a fixed posture. It can be prevented by the presence of interlocking opening / closing means for interlocking opening and closing symmetrically. Therefore, the front and rear end carriages can be kept in a steady posture upright on the floor surface in a side view when the cargo bed body is folded, and the front and rear end carriages can be moved toward each other safely and easily. In this case, according to the structure of Claim 3, the gear train which comprises the said interlocking opening / closing means can be comprised simply by a minimum of two spur gears.

  Furthermore, according to the structure of Claim 4, when it expand | deploys in a horizontal expansion | deployment state in order to use a loading-body main body (front and back two folding frames), two front and rear links which comprise a steadying means are connected. The common support shaft engages with the vertically engaged portions provided in the common vertical direction link of the two sets of parallel link mechanisms in the front and rear, and the deflection caused by the play of each part of the two sets of parallel link mechanisms in the front and rear, that is, Deformation movement in the front-rear direction of the two sets of front and rear parallel link mechanisms, specifically, when the side frame rising from one cart part is pushed toward the other cart part, it becomes a vertical link outside the parallel link mechanism It is possible to prevent the front and rear end carriage parts from being tilted in parallel with each other, and the side frame standing from each carriage part from being deformed to tilt in the pushing direction.

  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 a load support 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 frame 19 connected to the left and right ends of the left and right horizontal frame 18 in a plane T shape. The left and right rear end corners of each of the cart portions 6a and 6b (the left and right horizontal end portions 18a and 6b) are formed in an I-shape. An L-shaped bumper member 21 made of an elastic material or the like is attached to the front and rear horizontal frame 19 at the outer corner of the rear end). Further, each of the cart portions 6a and 6b is provided with a rectangular tube-like support portion 22 for supporting a pair of left and right side frames in a state where the lower end portion is attached to the inner surface of the rear end of the front and rear horizontal frame 19. The side frames 5a and 5b are supported in a state where the pair of left and right pedestal portions are vertically inserted by inserting them into the square cylindrical support portions 22 on the cart portions 6a and 6b. 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 10, the gear train 15 includes a pair of left and right spur gears 34 concentrically attached to the inner left / right horizontal 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 link 16 has an upper left and right side plate portion 36 and a lower center vertical plate portion 37, and the inner end portions of both folding frames 9a and 9b are connected to the upper left and right side plate portions 36 on the left and right sides. The pair of spur gears 34 and 35 are pivotally supported by left and right support shafts 38a and 38b concentric with the spur gears 34 and 35 so as to mesh with each other in a state adjacent to the inside of the upper left and right side plate portions 36. The folding frames 9a and 9b are configured to swing in conjunction with each other in the opposite directions around the support shafts 38a and 38b with respect to the common vertical link 16. 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 meshing with each other, and the support shafts 38a and 38b are formed by penetrating the support shafts 38a and 38b through the vertical plate portions. 38b, and the inverted U-shaped part on the upper side is positioned with respect to the axial direction of the support shafts 38a and 38b by fitting the upper and lower sides of the spur gears 34 and 35 meshing with each other. ing.

  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 the lower vertical plate portion 37 of the common vertical link 16 by the left and right horizontal support shafts 40a and 40b, and the outer end thereof is the vertical direction of the front and rear carriages 6a and 6b. The lower end of the frame 20 is supported by left and right support shafts 41a and 41b.

Thus, the two sets of front and rear parallel link mechanisms 14a and 14b are constituted by front and rear end carriages 6a and 6b, the two folding frames 9a and 9b, the common vertical link 16, and the lower vertical movement links 17a and 17b. However, in one parallel link mechanism 14a, the support shaft 38a that supports the folding frame 9a on the common vertical link 16 and the support shaft 40a that supports the lower vertical movement link 17a on the common vertical link 16 are supported. A link-equivalent axis 16a, and a support shaft 38b for supporting the folding frame 9b on the common vertical link 16 and a support for supporting the lower vertical movement link 17b on the common vertical link 16 in the other parallel link mechanism 14b. The link equivalent axis line 16b connecting the shaft 40b is X when the two front and rear folding frames 9a and 9b are viewed from the left and right lateral directions. It has a configuration which intersects Jo. Therefore, as shown in FIG. 2 (shown by dotted lines), FIG. 9 and FIG. 10, the lower vertical movement links 17a and 17b are bent at the inner end sides in opposite directions, and the inner end portions are shared vertically. The support shafts 40a and 40b that are pivotally supported on the lower vertical plate portion 37 of the direction link 16 are arranged so as to be in the front-rear reverse position, and the inner end portions of the vertical movement links 17a and 17b are configured to overlap each other in a side view. Has been.

  As shown in FIGS. 7 and 8, the unfolding state locking means 12 includes an engaged portion (a wire rod is connected to a flat core) that protrudes at the center position in the left-right width direction of the free end portion of the load support base 10 of the load base body 8. When the load carrier body 8 is in a horizontally deployed state (the free end portion of the load support base 10 is supported by the front end carriage portion 6a), the engaged portion 42 is automatically It is comprised from the latching tool 43 provided in the outer side of the vertical direction flame | frame 20 of the front end trolley | bogie part 6a so that it may engage. The locking member 43 is supported by a horizontal U-shaped support shaft 45 on a planar U-shaped bearing member 44 projecting outside the vertical frame 20 of the front end carriage portion 6a, and a stopper surface 46 (vertical direction). A torsion coil spring 47 that is biased and held at a locking position that is restrained by the outer surface of the frame 20 is provided, and an engagement recess 48 that automatically engages the engaged portion 42 is formed on the front side. At the upper end, a foot plate portion 49 constituting an operation tool is provided.

  As shown in FIGS. 4 and 6, steady-rest means 50 is incorporated in the two sets of front and rear parallel link mechanisms 14 a and 14 b. The steady rest means 50 includes a pair of left and right links whose outer ends are pivotally supported by left and right horizontal support shafts 51a and 51b 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. 52a, 52b, left and right horizontal common support shaft 53 that pivotally connects the inner ends of these links 52a, 52b, and a lower center vertical plate portion 37 of the common vertical link 16 cut out upward from the lower end. It is comprised from the to-be-engaged part 54 which consists of the formed vertical groove. Thus, when the cargo bed main body 8 (folding frames 9a, 9b) is in the horizontal unfolded state, as shown in FIG. 6, the common support shaft 53, which moves up with the unfolding of the folding frames 9a, 9b, is covered with the above-mentioned cover. The inner end of the lower vertical movement links 17a and 17b intersecting with each other so as not to interfere with the common support shaft 53 inserted into the engaged portion 54. The inner ends of the vertical movement links 17a and 17b are configured to be positioned above the engaged portion 54.

  As shown in FIGS. 4, 7, and 9, the folded state locking means 13 moves the 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 6b. A pair of left and right engaged portions 55 configured to extend on both sides, and left and right extended ends of a support shaft 41a that pivotally supports the lower vertical movement link 17a at the lower end of the vertically oriented frame 20 of the front end carriage portion 6a. An automatic locking type locking device 57 provided with an engaging concave portion 56 on the upper end of the tip that is pivotally supported so as to be swingable in the vertical direction and extends in the direction of the rear end carriage 6b. The torsion coil spring 59 is urged and held in a substantially horizontal locking posture that is restrained by a bolt-use stopper 58 attached to the side of the frame 20.

  The locking device 57 of the folded state locking means 13 is interlocked and connected by the interlocking means 60 to a locking tool 43 provided with a foot plate 49 that is an operating tool of the unfolded state locking means 12. The interlocking means 60 includes a lever portion 43a continuously provided so as to extend from the position of the support shaft 45 to the inside of the vertical frame 20 from the locking tool 43 of the deployed state locking means 12, and the tip of the lever portion 43a. A vertical link 63 having a longitudinally extending hole 62 on the lower end side and a support shaft 41a from the locking member 57 of the folded state locking means 13 is supported at the upper end by a horizontal horizontal support shaft 61. The lever portion 57a extends in the opposite direction, and the support shaft 64 is pivotally supported by the lever portion 57a and passes through the elongated hole 62 of the vertical link 63.

  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. As shown in FIG. 10, the fixed-fixed wheels 4a and 4b are attached to the lower sides of the left and right ends of the member 29 so as to be oriented in the front-rear direction via the wheel mounts 65a and 65b. Further, as shown in FIGS. 5, 6, and 10, the inner ends of the two front and rear folding frames 9a and 9b are fitted to each other when the folding frames 9a and 9b are in a horizontally developed state. Thus, there are provided fitting portions 66 and 67 for preventing the folding frames 9a and 9b from moving beyond the horizontally deployed state. In the embodiment, the fitting portion 66 of the front folding frame 9a is a protruding fitting portion that is configured by a protruding body that protrudes backward from the center position in the left-right width direction of the inner left-right horizontal orientation member 26, and the rear side. The fitting portion 67 of the folding frame 9b is a concave fitting portion into which the protruding fitting portion 66 is fitted, and 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 68 attached to the position lower side.

  Thus, in a side view, the protruding fitting portion 66 can enter the recessed fitting portion 67 without interfering with the inner left-right horizontal member 29 of the rear folding frame 9b on the other side. The upper end corner of the tip is configured to be cut obliquely. Further, as shown in FIG. 6, when the projecting fitting portion 66 and the recessed fitting portion 67 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, 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 66.

  As shown in FIG. 1, the pair of front and rear side frames 5 a and 5 b are constructed by installing a horizontal beam 70 in a plurality of upper and lower stages between a pair of left and right vertical columns 69. It is configured to be able to be bent and inwardly inserted into a pair of left and right square cylindrical support portions 22 of the front and rear end carriages 6a and 6b. Thus, an intermediate shelf 71 is detachably installed between the pair of front and rear side frames 5a and 5b by using the cross rail 70 at the same level. The intermediate shelf 71 is provided with a pair of left and right hooks 72a and 72b and engaging pieces 73a and 73b, respectively, which are fitted to the horizontal rail 70 from above at both ends in the front-rear direction.

  The hooks 72a and 72b and the locking pieces 73a and 73b are each formed by bending a wire rod into a V shape, and the locking pieces 73a and 73b are shifted in the left-right symmetrical direction with respect to the center in the left-right width direction. It is arranged. Then, as shown in FIG. 3, the side frames 5 a, 5 b, 5 b, 5 b, or 5 b can be locked along the side frames 5 b (or 5 a) as shown in FIG. 3. A pair of left and right pins 74 to which a pair of left and right hooks 72a (or 72b) can be fitted from above using the inner space of the V-shaped tip portion are provided on the horizontal rail 70 at the upper level of 5b (the uppermost stage in the illustrated example). A lower locking piece 73b (or 73a) is projected on the lower (in the illustrated example) horizontal crosspiece 70 by using the inner space of the V-shaped tip. One pin 75 that can be fitted from the upper side protrudes upward. In other words, as described above, the hook 72a (or 72b) that is on the upper side is fitted to the pin 74 from above, and at the same time, the lower locking piece 73b (or 73a) is The vertical distance between the two upper and lower horizontal rails 70 provided with these pins 74 and 75 is set so that they can be fitted together.

  The direction fixing wheels 4a and 4b are equipped with braking means, and the operating means 76 for operating the braking means is a front end carriage on which the unfolded state locking means 12 and the folded state locking means 13 are arranged. It is provided in a rear end carriage part 6b opposite to the part 6a.

  Describing how to use the transport cart having the above-described configuration, as shown in FIG. 8, in a state where the load carrier body 8 is horizontally deployed as shown in FIG. 1 and this transport cart is used for transporting the load, as shown in FIG. The engaged portion 42 at the free end portion of the load supporting base 10 is automatically locked in the engaged portion 48 of the locking tool 43 in the deployed state locking means 12, and the load supporting base 10 is moved upward. Is blocking. At the same time, in this state, as shown in FIG. 6, the common support shaft 53 between the two links 52a and 52b enters upward into the engaged portion 54 of the common vertical link 16, and the steadying means 50 is in a working state. As a result, it is possible to prevent the transportation carriage from swinging back and forth. That is, the common support shaft 53 between the two links 52a and 52b enters the engaged portion 54, thereby forming a lattice structure portion that prevents buckling deformation motion in the front-rear direction of the two sets of parallel link mechanisms 14a and 14b. Therefore, when one of the side frames 5a and 5b is pushed or pulled to run the transport carriage, the front and rear two pairs of parallel link mechanisms 14a and 14b are accompanied by a buckling deformation motion in the front-rear direction. As a result, the swaying 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 projecting fitting portion 66 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 67) of the inner left-right horizontal member 29 of the rear folding frame 9b. Since it overlaps on the protrusion-like fitting portion 66 of the front folding frame 9b, the front and rear folding frames 9a and 9b are prevented from bending downward beyond the horizontal unfolded state. 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 Etc. unreasonable load engaged portion 42 and the locking member 43 (see FIG. 8) can be prevented from acting.

  Thus, the transportation carriage can be pushed or pulled with any one of the side frames 5a and 5b as a handle. At this time, the carriage 1 is at a substantially central position in the longitudinal direction of the loading platform 1. In addition, since the pair of left and right direction fixed wheels 4a and 4b whose directions are fixed in the front-rear direction are in contact with the ground, they are highly straight forward in the front-rear direction and can be driven without wobbling in the left-right and left-right directions. When turning in the direction, it is possible to easily turn the transportation cart that is long in the front-rear direction with the central position between the pair of left and right direction fixed wheels 4a, 4b as a fulcrum. In order to reliably obtain this action, it is desirable to attach the fixed wheels 4a and 4b so that they protrude slightly downward from the common ground level of the free wheels 2a to 3b. When the direction-fixed wheels 4a and 4b are provided with braking means, the direction-fixed wheels 4a and 4b can be braked and stopped stably when necessary by the operating means 76. .

  As shown in FIG. 3, when the unused transport cart is loaded on the vehicle carrier or stored in a limited space, the carrier body 8 is folded so that the front and rear carriage units 6 a and 6 b are adjacent to each other. It can be in a folded state. That is, the stepping plate portion 49 of the locking member 43 of the deployed state locking means 12 shown in FIG. 8 is stepped down and rotated in the unlocking direction against the torsion coil spring 47, thereby causing the engaging recess 48 to move. As shown in FIG. 4, when the carrier body 8 (load support base 10) is separated from the engaged portion 42, the two front and rear folding frames 9a and 9b are twisted between the front and rear carriage portions 6a and 6b. Each of the coil springs 30a to 31b is rotated upward by the urging force.

  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 surface. 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 engaged portions 55 (both ends of the support shaft 41b) on the rear end carriage part 6b side of the stopping means 13 are automatically engaged with the engagement recesses 56 of the locking member 57 on the front end carriage part 6a side, as shown in FIG. The carriage is locked in the folded state. At this time, the rear end side lever portion 57a of the locking device 57 moves up and down for a moment, but the movement of the locking device 57 is unfolded only by the support shaft 64 moving freely in the long hole 62 of the vertical link 63. It is not transmitted to the locking tool 43 side of the locking means 12.

  When the folded bed body 8 is unfolded and used, as shown in FIG. 7, the stepping plate portion 49 of the locking tool 43 of the unfolded state locking means 12 that is not functioning in the folded state is stepped on. Then, the locking member 57 of the folded state locking means 13 is twisted via the lever portion 43a, the vertical link 63, the long hole 62, the support shaft 64, and the lever portion 57a of the locking device 57, and the coil spring 59 is twisted. The engaging recess 56 is moved downward from the engaged portion 55 (both ends of the support shaft 41b) on the rear end carriage portion 6b side. As a result, the front and rear end carriages 6a and 6b can move in directions away from each other, so that the cargo bed body 8 that has been folded by gravity and manually can be unfolded in the direction. When the unfolding operation of the cargo bed main body 8 (folding frames 9a and 9b) stops in a state where it is balanced with the urging forces of the torsion coil springs 30a to 31b, the load support bed 10 is pushed down, etc. If the end portion is forcibly deployed to the horizontally deployed state where it is supported on the front end carriage portion 6a, the engaged portion 42 on the free end side of the load support base 10 is locked in the deployed state as shown in FIG. By automatically engaging with the engaging recess 48 of the locking member 43 of the means 12, the cargo bed body 8 is locked in the horizontally deployed state.

  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 used as the load support base 10. Alternatively, a load supporting surface may be formed on each of the folding frames 9a and 9b, and the both folding frames 9a and 9b themselves in a horizontally developed state may form a load supporting base. That is, the load support base itself may be a foldable one having a bending joint at the center.

  Further, although the gear train 15 is added to the two front and rear parallel link mechanisms 14a and 14b to configure the interlocking opening / closing means 11, the present invention is not limited to this. For example, instead of the gear train 15, the links 52 a and 52 b of the steadying means 50 are shortened, and the vertically recessed groove-like engaged portion 54 is configured to be long so that the common support shaft 53 is always engaged. It is also possible to configure the interlocking opening / closing means by combining this with two sets of parallel link mechanisms 14a, 14b.

  In addition, torsion coil springs 30a to 31b interposed between the front and rear folding frames 9a and 9b and the front and rear carriages 6a and 6b were used as springs for urging the carrier body 8 in the folding direction. However, a spring can be interposed between the two front and rear folding frames 9a and 9b (between the load support base 8a and the vertical movement frame 8b), or a spring can be interposed between both. 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.

  Orientation fixed wheels 4a and 4b are not essential to the present invention. Moreover, also when providing a direction fixed wheel, the number and attachment position are not limited to the thing of the said 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 lateral width of the cargo bed body 8. Moreover, when providing a fixed direction wheel, the fixed direction wheel is attached so as to protrude slightly downward from the common ground level of the universal wheels 2a to 3b so that the center part of the cargo bed body 8 is slightly lifted by the fixed direction wheel. Although it is general to configure, it may be configured to have the same ground level as the common ground level of the universal wheels 2a to 3b. Of course, it may be a direction-fixed wheel having no braking means.

  Further, the unfolded state locking means and the folded state locking means are not essential to the present invention. In particular, the center portion of the cargo bed body 8 is not slightly lifted by the fixed-direction wheels, and when the cargo bed body 8 is in a horizontally deployed state as in the above-described embodiment, the front and rear carriage portions 6a and 6b When the front and rear ends are supported and the load support base 10 which is not itself a folding structure is used, the load base body 8 is used in a state where the load base body 8 is stabilized in a horizontal unfolded state without using the unfolding state locking means. be able to. In addition, when the folded loading platform 1 naturally expands due to gravity, the folded loading platform 1 does not have to be provided with a special folded state locking means as shown in the above embodiment. What is necessary is just to bind the loading platform 1 of the state folded with the rubber band or the string-like object so that it may not expand | deploy unexpectedly.

Fig. A is a side view of a transport cart with the cargo bed body in a horizontally deployed state, Fig. B is the same front view, and Fig. C is the same 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 partially vertical side view of the principal part of FIG. It is a cross-sectional top view which shows a folding state latching | locking means, the lower vertical movement link of a parallel link mechanism, and a common perpendicular direction link. It is a center part vertical front view of the trolley | bogie for conveyance in the unfolded state.

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-ends trolley part 8 Loading platform main body 8a Loading support base part 8b Folding frame 9a, 9b Folding frame 10 12 Unfolded state locking means 13 Folded state locking means 14a, 14b Parallel link mechanism 15 Gear train 16 Common vertical-direction links 16a, 16b Link equivalent axes 17a, 17b in the common vertical-direction links Lower vertical movement links 30a-31b, 47, 59 Torsion coil springs 34, 35 Spur gears 42, 55 Engaged parts 48, 54, 56 Engaging recesses 43 Locking means 49 of the deployed state locking means Footing plate part 50 Stabilizing means 52a, 52b Link 53 of the locking means Common support shaft 57 Locking tool 60 of the folded state locking means Interlocking means 63 Vertical link of the interlocking means 6 protruding fitting portion 67 recessed shaped fitting portion 76 facing the brake operating means of the fixed wheel

Claims (4)

The loading platform consists of front and rear end carriages (6a, 6b) each equipped with wheels, and a front and rear carriage units (6a, 6b) connected to each other and configured to be foldable (8) . The cargo bed body (8) includes two front and rear folding frames (9a, 9b) that are connected so that the bottom side faces to face each other, and two sets of parallel link mechanisms (14a, 14b). The two sets of parallel link mechanisms (14a, 14b) are arranged such that the front and rear carriages (6a, 6b) , the two folding frames (9a, 9b), and the inner ends of the two folding frames (9a, 9b) A common vertical link (16) that is pivotally supported, and a common vertical link (16) below the two folding frames (9a, 9b ) and a front and rear carriage unit (6a, 6b). has been lower vertically movable link (17a, 17b) is constructed from a, in one of the parallel link mechanism (14a) folded in a common vertical orientation link (16) frame (9a) The link equivalent axis (16a) connecting the supporting shaft (38a) and the supporting shaft (40a) supporting the lower vertical movement link (17a) to the common vertical link (16), and the other parallel link mechanism ( 14b), the support shaft (38b) for supporting the folding frame (9b) on the common vertical link (16) and the support shaft (40b) for supporting the lower vertical movement link (17b) on the common vertical link (16). And a link equivalent axis line (16b) connecting the two front and rear folding frames (9a, 9b) when viewed from the left and right lateral directions . It is provided with interlocking opening / closing means (11) for interlocking opening and closing of the two folding frames (9a, 9b) with each other in a symmetrical manner with the front and rear carriages (6a, 6b) held in a fixed posture. 11. The transporting carriage according to claim 1 , wherein 11) includes the two sets of parallel link mechanisms (14 a, 14 b) and a gear train (15) . The gear train (15) is concentric with two parallel support shafts (38a, 38b) that support the inner end side of the two folding frames (9a, 9b) on a common vertical link (16). The transporting carriage according to claim 2, comprising a spur gear (34, 35) engaged with each other and fixed to each folding frame (9a, 9b) . The two folding frames (9a, 9b) in the horizontally unfolded state are provided with steady-state means (50), and the steady-state means (50) has a length of each of the two folded frames (9a, 9b). Provided on the two front and rear links (52a, 52b) in which the outer end is pivotally supported at an intermediate position in the direction and the inner ends are pivotally supported by the common pivot (53) , and the common vertical link (16). And when the two folding frames (9a, 9b) are in a horizontally developed state, the common support shaft (53) is connected to the engaged portions (54). front-rear direction position is configured to be regulated, dolly according to any one of claims 1 to 3 engaged in 54) to the common support shaft (53).