JP4640252B2 - Load support base locking device for folding carriage - Google Patents

Description

  The present invention relates to a load support base for a foldable transport carriage, that is, a load support base for locking a load support base pivotally supported on the lower side of a back panel to left and right side panels in a horizontal lying posture. It relates to a stop device.

The load support base locking device of the folding transport cart is such that the load support base pivotally supported on the lower side of the back panel is pivoted forward and downward to support the left and right sides on the left and right side panels. In use, it is necessary to lift up the load support pedestal with a forklift and move this transfer trolley, but it is necessary to lock the load support pedestal of this conventional foldable transfer trolley. As disclosed in Japanese Patent Application Laid-Open No. H10-228707, a load-supporting base is configured such that a rod, which is mounted on a front side of a load support base so as to be movable in parallel in the front-rear direction, is biased and held by a spring at a locking action position of a rearward movement limit. A locking piece that engages both the left and right ends of the rod when projecting to the horizontal lying posture protrudes on the lower side of the left and right panels, and the load support base is moved up so as to overlap the back panel Engagement between the rod and the locking piece When is released, were those which translate into unlocked position of the forward movement limit against the rod to the biasing force of the spring.
Japanese Patent Laid-Open No. 9-2273

  In the conventional load support base locking device as described above, biasing means including a spring for biasing and holding the rod that is movable back and forth in the locking position is essential, and the number of parts is large. Not only has the disadvantage that the structure is complicated and expensive, but also the direction of operation when translating the rod to the unlocking position is different from the lifting direction when raising the load support base, so the rod A two-step operation with different operation directions is required: an operation to translate the rod to the unlocking position and an operation to lift the load supporting table, and the operation to move the rod to the unlocking position from the top of the load supporting table. Therefore, after releasing the lock, even if the load support base can be moved up with the hand that operated the rod, the load support base will be lifted up instead of being lifted. Back To move upward to the upright position overlapping the channel must be switched to the operation for pushing up the load support stand from the bottom side, load support stand folding operation is not easy.

  An object of the present invention is to provide a load support base locking device for a foldable transport cart that can solve the above-described conventional problems, and means for that will be described later. And a horizontal horizontal rod 24 supported in parallel with the front side at a position in the vicinity of the front side of the load support base 4 that is pivotally supported on the lower side of the back panel 1. The left and right side panels 2 are engageable with both ends of the rod 24 when the load support stage 4 is in a horizontal lying posture where the left and right sides of the load support stage 4 are supported by the lower sides of the left and right side panels 2 and 3. , 3 and a pair of locking pieces 29a and 29b, and the rod 24 is engaged with the locking pieces 29a and 29b, and the engagement position P1 is engaged with the locking pieces 29a and 29b. Operating means 2 for translating horizontally in the front-rear horizontal direction to the stop release position P2. The operation means 25 includes a rod guide 34 provided on the load support base 4 to support the rod 24 so as to be movable in the front-rear and horizontal directions, and an operation member 35 provided on the front side of the load support base 4. The operation member 35 is loosely fitted in a notch recess 36 provided on the front side of the load support base 4 and the rear side is pivotally supported so as to swing up and down. The through-hole 37 engages the rod 24 from the locking action position P1 when the operating member 35 moves upward from a lower movement limit position that is flush with the upper surface of the load support base 4. In addition to being moved to the stop release position P2, the rod 24 is configured to have an oblique long hole shape that moves the rod 24 from the lock release position P2 to the lock action position P1 when the operation member 35 moves downward from the upper movement limit position. is there.

  In carrying out the present invention having the above-described configuration, specifically, as described in claim 2, the rod 24 is engaged with the locking pieces 29a and 29b when the back panel 1 is moved rearward. It reaches the stop action position P1, and is configured to reach the lock release position where it is released from the lock pieces 29a and 29b by moving forward on the side opposite to the side where the back panel 1 is located. The hole 37 can be formed in an oblique long hole shape that is inclined so that the front side opposite to the side on which the back panel 1 is located is lowered. In this case, as described in claim 3, the operation member 35 is provided with a thick front end portion 35 a whose bottom surface protrudes downward, and the through hole 37 is provided in the thick front end portion 35 a of the operation member 35. Can be provided. Further, in this case, as described in claim 4, a protrusion 42 is formed on the bottom surface side of the load support base 4 so as to surround the notch recess 36 in which the operation member 35 is loosely fitted. The entire operation member 35 including the thick front end portion 35a from 42 can be configured not to protrude downward.

  In addition, as described in claim 5, the rod guide 34 is configured to penetrate between the left and right sides of the load support base 4, and the rod 24 penetrates the through hole 37 of the operation member 35. The rod guide 34 is inserted from one end, and the left and right sides of the load support base 4 are provided with openings 33a and 33b that overlap with both ends of the rod 24 and into which the locking pieces 29a and 29b are loosely fitted. Can do. In this case, as described in claim 6, the load supporting base 4 is provided with a recessed portion 39 that is open on the lower side so as to overlap the rod guide 34, and a rod retaining member 38 is idled in the recessed portion 39. The rod 24 is inserted into the rod guide 34 from one end so as to pass through the through hole 37 of the operation member 35 and the through hole 38a of the rod retaining member 38, and the rod retaining member 38 The rod 24 can be provided with a locking portion 40 that engages with each other by press-fitting the rod 24 and prevents relative movement in the axial direction therebetween.

  Further, according to a seventh aspect of the present invention, the load support base 4 is embedded with reinforcing steel pipes 20a to 20c in the left and right lateral directions at appropriate intervals in the front and rear direction, and the operation member 35 is connected to the reinforcing steel pipes 20a to 20a. Of 20c, it can be supported on the foremost reinforcing steel pipe 20a so as to be swingable up and down.

  According to the load support base locking device of the foldable transport cart according to the present invention having the above-described configuration, the load support base lock release operation, which is a preparatory operation for raising the load support base upward, is performed on the load support base. This is an operation to lift the operating member provided on the front side upward from the bottom side to the upper limit position. By lifting the load support base as it is through the operating member lifted to the limit position, the load support base after the release of the lock can be continuously moved up to a standing posture overlapping the back panel. Therefore, the operator can lift the locked load support base from the bottom side and stand up in one behavior as it is without being aware of the unlocking operation only by specifying the operation target part. Unlocking and standing folding operations can be performed very easily and efficiently.

  In addition, since the operating member is biased and held at the lower limit position by its own weight without being particularly biased by the spring, the operating means for moving the rod between the locking action position and the locking release position. Can be configured simply by pivotally supporting an operation member having an obliquely inclined through hole in a notch recess formed in the front side of the load support base so that it can swing up and down. It can be implemented at low cost.

  According to the present invention, the through hole of the operation member is formed into a long hole shape that is inclined upward, and the rod is translated rearward and detached from the locking piece when the operation member is swung upward. Although it can also be carried out, according to the configuration of claim 2, the length of the operating member in the front-rear direction and the upward movement of the operating member for ensuring the amount of forward-backward movement of the rod between the locking action position and the locking release position. The lifting operation amount to the limit position can be reduced, and the operation member can be made compact and good operability can be obtained.

  In addition, when the configuration according to claim 2 is adopted, according to the configuration according to claim 3, the thick front end portion of the operation member for forming the long hole-shaped through hole inclined forward and downward is provided. It can be used as a handle portion protruding toward the bottom surface side, and the unlocking operation by lifting the operation member from the bottom surface side and the subsequent upright operation for raising the load support table can be easily and reliably performed at the hand. In this case, according to the configuration described in claim 4, the notch recess in which the operation member is loosely fitted is provided even when the thickness front end portion of the operation member protrudes downward from the bottom surface level of the load support base. Due to the presence of the U-shaped projecting part, a dangerous situation in which when the forklift supports the load support base and lifts the transport carriage, the operation member is accidentally pushed up by the fork and the load support base is unlocked. Can be avoided and safety can be improved.

  Moreover, according to the structure of Claim 5, although the assembly | attachment of the rod with respect to the rod guide of a load support stand and an operation member can be performed very simply and easily, especially by using the structure of Claim 6 together, Although the rod can be assembled easily and easily, the rod can be reliably held at a predetermined position in the load support base.

  Furthermore, according to the structure of Claim 7, since a part of reinforcement steel pipe embed | buried under a load support stand can be utilized as a spindle which supports an operation member, it is useful also for the further reduction of a number of parts. At the same time, the shaft support strength of the operation member can be increased.

  A specific embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 3, 1 is a back panel, 2 is a left panel, 3 is a right panel, and 4 is a load support. The back panel 1 and the left and right side panels 2 and 3 each have a gate-shaped peripheral frame 6 made of a round pipe material bent into a gate shape on a lower side member 5 using an angle material. A plurality of vertical bars 7 and a plurality of horizontal bars 8 are constructed in a lattice shape in a rectangular region surrounded by the side member 5 and the gate-shaped peripheral frame 6.

  Wheels (a universal wheel, a fixed direction wheel, etc.) 9a to 9d are attached to the lower side of both ends of the back panel 1 and the lower side of the front ends of the left and right side panels 2 and 3, respectively. The wheels 9a, 9b below the both ends of the back panel 1 have two mounting seats 10a, 10b so that the lower side members 5 of the back panel 1 protrude below the both ends, only inward (forward). The wheel 9c attached to the left panel 2 with the bolts and nuts 11 so that the mounting seat 10c projects only inward (right side) below the front end of the lower side member 5 of the left panel 2. A wheel 9d attached to the lower side of the front end of the right side panel 3 is mounted with two bolts and nuts 12 and its mounting seat 10d protrudes only on the inner side (left side) below the front end of the lower side member 5 of the right side panel 3. The two bolts and nuts 13 are attached.

  The left side panel 2 has the rear end portion of the lower side member 5 superimposed on the left side portion of the portion protruding forward from the lower side member 5 of the wheel mounting seat 10a below the left end portion of the back panel 1. In this state, the vertical pin 14 and the bolt nut 15 are fixed to the back panel 1 at a right angle. The right side panel 3 has the rear end portion of the lower side member 5 superimposed on the right side portion of the portion protruding forward from the lower side member 5 of the wheel mounting seat 10b below the right side end portion of the back panel 1. In this state, the vertical pins 16 are connected so as to be swingable in the horizontal direction. As shown in FIG. 3, a notch portion 17 into which the rear end portion of the lower side member 5 of the left panel 2 enters is formed at the left end portion of the lower side member 5 of the back panel 1. While the left column part 6a of the portal peripheral frame 6 of the back panel 1 and the rear column part 6b of the portal peripheral frame 6 of the left panel 2 are sufficiently close to each other, the lower side member of the back panel 1 5 and a rear end portion of the lower side member 5 of the right panel 3, a space is secured, and the right column portion 6 b of the gate-shaped peripheral frame 6 of the back panel 1 and the gate of the right panel 3. The shape surrounding frame 6 is sufficiently separated from the rear column portion 6b. The vertical pin 14 is concentrically fitted into the rear column 6b of the portal peripheral frame 6 of the left panel 2, and the vertical pin 16 is the rear column of the portal peripheral frame 6 of the right panel 3. It fits concentrically in the part 6b.

  As shown in FIGS. 1 and 2, the left and right support columns 6 a and 6 b of the portal peripheral frame 6 of the back panel 1 and the rear support column 6 b of the portal peripheral frame 6 of the left and right panels 2 and 3 are respectively The two upper and lower connecting members 18 and 19 are connected. These connecting members 18 and 19 are fixed to the left and right side column parts 6a and 6b on the back panel 1 side so as not to be horizontally swingable, and to the left and right side panels 2 and 3 side rear column part 6b. Are loosely fitted in a state allowing rotation around the axis of the rear column portion 6b.

  As shown in FIG. 3, the load support base 4 is a rectangular board made of synthetic resin, in which left and right lateral reinforcing steel pipes 20 a to 20 c are embedded at appropriate intervals in the front-rear direction, and left and right ends on the rear side. A pair of left and right bearing projecting pieces 21 and 22 are provided to project rearward from the two neighboring locations, and a rod 24 and an operating means 25 constituting the locking device 23 are provided at positions near the front side. . On the other hand, the lower side member 5 of the back panel 1 is for bearings that are fitted between the pair of left and right bearing protruding pieces 21 and 22 of the load supporting base 4 at both left and right ends overlapping the wheel mounting seats 10a and 10b. The projecting pieces 26 and 27 are integrally formed by cutting and raising, and the projecting pieces 26 and 27 for bearings and the projecting pieces 21 and 22 for bearings on the load supporting base 4 side are horizontally supported by the shaft 28 (FIGS. 6, 7 and 9). The load supporting base 4 is connected to the lower side of the back panel 1 so as to be raised and lowered.

  Thus, the left and right sides of the load support base 4 are supported on the lower side members 5 of the left and right side panels 2 and 3 by causing the load support base 4 to fall down to the horizontal state in the forward and downward direction. In this state, the locking device 23 locks the front end portions of the left and right sides of the load support base 4 to the lower side members 5 of the left and right side panels 2, 3. And is provided with locking pieces 29a and 29b provided on the left and right side panels 2 and 3 so as to engage with both ends of the rod 24 on the load support base 4 side.

  Hereinafter, the details of the locking device 23 will be described with reference to FIGS. 3 to 9. As shown in FIG. 9, the locking pieces 29 a and 29 b are forward-facing with the tip opposite to the side where the back panel 1 is located. 3 and FIG. 4, a notch formed on the lower side member 5 of the left and right side panels 2, 3 with a mounting seat 30 bent continuously from the lower end. In the state where it is fitted and positioned in the portion 31, it is fixed on the wheel mounting seats 10c, 10d by one bolt nut 32 respectively. The left and right sides of the load support base 4 have long openings in the front-rear direction in which the locking pieces 29a and 29b on the left and right side panels 2 and 3 enter upward when the load support base 4 is turned to the horizontal lying posture. Portions 33a and 33b are provided. The rod 24 is made of a round bar material parallel to the front side of the load support base 4, and is inserted into a rod guide 34 provided on the load support base 4 so as to be movable in parallel in the horizontal front-rear direction. As shown in FIGS. 3 and 4, the rod guide 34 is a long hole in the front-rear direction provided in parallel with the front side of the load support base 4, and both ends thereof are the left and right sides of the load support base 4. The rod 24 opened on both sides and inserted into the rod guide 34 has a length that does not protrude from the load support base 4 to the left and right, and both ends thereof traverse the openings 33a and 33b. .

  Thus, as shown in FIGS. 6 and 7, the rod guide 34 engages with the locking pieces 29a and 29b (the locking pieces 29a and 29b) when the load supporting base 4 is in the horizontal lying posture. It is possible to translate in the front-rear direction between the locking position P1 (which enters the lower side of the hook portion) and the locking release position P2 which has been released forward from the locking pieces 29a and 29b. The operation means 25 includes the rod guide 34 and an operation member 35 provided on the front side of the load support base 4. A notch recess 36 is provided at the center in the width direction of the front side of the load support base 4 so that the reinforcing steel pipe 20a at the foremost end is exposed, and the operation member 35 is loosely fitted in the notch recess 36. The rear side is supported by the reinforcing steel pipe 20a exposed in the notch recess 36 so as to be swingable up and down, and has a thick front end portion 35a whose bottom side protrudes downward. A through hole 37 through which the rod 24 passes is provided in the thick front end portion 35a. As shown in FIGS. 8A and 8B, the through-hole 37 allows the rod 24 to move away from the locking action position P1 when the operating member 35 moves upward from a lower movement limit position that is flush with the upper surface of the load support base 4. In addition to being moved to the unlocking position P2, when the operation member 35 is moved downward from the upper limit position, the rod 24 is tilted forward and downward so as to move from the unlocking position P2 to the locking action position P1. It has a long hole shape.

  The rod 24 is inserted horizontally across the rod guide 34 of the load support base 4 and the through hole 37 of the operation member 35. To position the rod 24, as shown in FIGS. A rod retaining member 38 is provided on the surface. This rod retaining member 38 is loosely fitted in a lower open recessed portion 39 provided on the load supporting base 4 so as to overlap the rod guide 34, and the rod 24 is inserted into the rod guide 34 from one end. When inserted, a locking portion 40 is provided that engages with each other by press-fitting the rod 24 into the rod retaining member 38 to prevent relative movement in the axial direction of the rods. As shown in FIG. 5, the locking portion 40 in this embodiment includes an annular groove 40 a provided on the peripheral surface of the rod 24 and an annular groove 40 a on the inner peripheral surface of the through hole 38 a of the rod retaining member 38. It is comprised from the cyclic | annular protrusion 40b of the circumferential direction integrally formed so that it might fit. Of course, the lower open recessed portion 39 has a length in the front-rear direction that does not prevent the rod 24 from moving in the front-rear direction between the locking action position P1 and the locking release position P2 in the rod guide 34. .

  As shown in FIG. 1, the foldable transport cart configured as described above is configured such that the load support base 4 is turned forward and downward, and the left and right sides thereof are the lower side members of the left and right side panels 2 and 3. 5, and the load support table 4 in the horizontally lying posture can be used for transporting work while being locked to the lower side members 5 of the left and right side panels 2 and 3 by the load support table locking device 23. In this state, as shown in FIGS. 4, 6, and 7, the locking pieces 29 a and 29 b on the left and right side panels 2 and 3 are fitted into the openings 33 a and 33 b on the load support base 4 side. As shown in FIG. 5, the operation member 35 has an upper surface at the lower limit position which is flush with the upper surface of the load support table 4, and the rear end portion of the rod guide 34 on the load support table 4 side and the penetration on the operation member 35 side. It exists in the state which overlaps with the rear upper end part of the hole 37 in a side view. The rod 24 on the load supporting base 4 side is held in a common hole portion in a side view of the rod guide 34 and the through hole 37 on the operation member 35 side, so that the position of the rear end portion of the rod guide 34, that is, the locking action. The rod 24 is held at the position P1, and both ends of the rod 24 enter the lower side of the front end hook portions of the locking pieces 29a and 29b.

  Therefore, in this state, the upright motion of the load support table 4 is prevented by both ends of the rod 24 and the locking pieces 29a and 29b on the left and right side panels 2 and 3, so that the load support table is supported by the fork of the forklift. 4 can be lifted up to lift and move the entire carriage. The operation member 35 is provided with a thick front end portion 35a whose bottom surface protrudes downward because of the need to provide a forward and downward slanted long hole-shaped through hole 37. The thick front end portion 35a If the entire operation member 35 including the size is within the thickness range of the load support base 4, the entire load support base 4 becomes thick, resulting in an increase in weight and cost. Therefore, only the thick front end portion 35a of the operation member 35 is configured to protrude downward from the bottom surface of the load support base 4. In this case, the work of lifting the load support base 4 with the fork as described above is performed. At this time, there is a possibility that the bottom surface of the thick front end portion 35a of the operation member 35 protruding downward from the bottom surface of the load supporting base 4 may be scooped up by mistake. In order to eliminate this inconvenience, as shown in FIG. 4 and FIGS. 8A and 8B, protruding portions along the three sides of the notch recess 36 in which the operation member 35 is loosely fitted on the bottom surface side of the load support base 4. 42 is formed so that the entire operation member 35 including the thick front end 35a is accommodated between the lower end level of the protrusion 42 and the upper surface of the load support base 4, and the fork is notched in the recess 36 in any direction. The fork can be configured not to push up the operation member 35 with respect to the load support base 4 even in a situation where the crosses.

  The unused carriage can be folded into an L shape in plan view as shown in FIG. That is, as shown in FIG. 8A, the operation member 35 located at the lower limit position with respect to the load support base 4 is lifted by a hand or a foot, and the operation member 35 is a reinforcing steel pipe serving as a support shaft. When pivoting upward around 20a, as shown in FIG. 8B, a longitudinally long rod guide 34 on the load support base 4 side and a long hole-like through hole inclined forward and downward on the operation member 35 side Since the overlapping portion (common hole portion) in the side view with 37 moves forward along the rod guide 34, the overlapping portion (common hole portion) in the side view with the rod guide 34 and the through hole 37 is formed. The held rod 24 is moved forward in the rod guide 34 and switched from the locking position P1 to the locking release position P2. As described above, when the operation member 35 is provided with the thick front end portion 35a whose bottom surface protrudes downward, the lower protrusion portion of the thick front end portion 35a lifts the operation member 35 with the hand. It becomes a grip part where the hand is caught when performing the operation, and the operation becomes easy.

  As a result of the above operation, both ends of the rod 24 are disengaged forward from the front end hooks of the locking pieces 29a, 29b on the left and right side panels 2, 3, and the load support 4 can be lifted. As shown in FIG. 9, the load support table 4 can be lifted up with respect to the back panel 1 around the horizontal support shaft 28 as shown in FIG. 9. When the load support base 4 is switched to the standing posture overlapping the back panel 1, the load support base 4 is located on the rear side (back panel 1 side) of the left panel 3, so that the left panel 3 is moved as shown in FIG. The horizontal support 6b (vertical pin 16) is pivoted horizontally toward the right panel 2 around the rear column 6b (vertical pin 16), and the load is supported between the right panel 2 and the back panel 1 in a standing posture. The carriage 4 can be sandwiched and the conveyance carriage can be deformed into an L shape in plan view. At this time, as shown in FIG. 2, the portion projecting inwardly from the lower side member 5 of the wheel mounting seat 10d attached to the lower side of the front end of the left panel 3 is the lower side (lower side) of the back panel 1. Therefore, at least the portion protruding inward from the lower side member 5 of the wheel mounting seat 10d (in the illustrated embodiment, all the wheel mounting seats 10a to 10d) The lower side member 5 is configured to be one step lower than the bottom surface of the lower side member 5, and the portion protruding inwardly from the lower side member 5 of the wheel mounting seat 10 d at the time of the folding operation is the lower side member 5 of the back panel 1. So that you can easily enter the underside.

  When using the carrier cart folded as described above, the left-side panel 3 is opened horizontally so that the left-side panel 3 is oriented perpendicularly to the back panel 1, and the standing load-supporting platform 4 is moved forward. The right and left sides are placed on the lower side members 5 of the left and right side panels 2 and 3 by turning downward, but at least immediately before the load support 4 is in the horizontal lying posture, the operation member 35 is lifted upward by hand to switch to the upper limit position, and the rod 24 is held at the unlocking position P2 as shown in FIG. 8B and FIG. It is placed on the lower side member 5 of the panels 2 and 3. Thereafter, the rod 24 is switched from the locking release position P2 to the locking action position P1 by switching to the lower movement limit position shown in FIG. 8A by pushing down the operating member 35 by its own weight or positively from above. The both ends of the rod 24 are engaged with the locking pieces 29a and 29b on the left and right side panels 2 and 3 which are fitted in the openings 33a and 33b on the left and right sides of the load support base 4, respectively. The left and right sides of 4 may be engaged with the lower side members 5 of the left and right panels 2 and 3.

  When the through hole 37 on the side of the operation member 35 has a straight shape between the front and rear ends and is inclined forward and downward, the operation member 35 is used when the load support base 4 is turned to the horizontal lying posture. However, even when the upper surface is in the lower movement limit position where the upper surface is flush with the upper surface of the load support base 4 and the rod 24 is held at the locking action position P1, the load support base 4 is attached to the left and right side panels 2, 2. Immediately before being supported at 3, both ends of the rod 24 are pushed forward while the operating member 35 is moved upward at the forward and downward inclined sides above the tip hook portions of the locking pieces 29 a, 29 b, and the rod 24 is temporarily moved. When the load support base 4 is supported by the left and right side panels 2 and 3 when the load support base 4 is supported by the left and right panels 2 and 3, the rod 24 is moved by returning the operation member 35 to the lower movement limit position by gravity or positive push-down operation. Returning to the locking position P1, the locking pieces 29a, 2 It can be engaged with the b.

  Contrary to the above, as shown in FIGS. 8A and 8B, the through hole 37 on the operation member 35 side is formed in a crank shape with the rear upper end bent upward, and the rear upper end of the through hole 37 is formed. In the case where the bent portion 37a into which the rod 24 is fitted is provided, as described above, at least immediately before the load supporting base 4 is supported by the left and right side panels 2 and 3, the operating member 35 is moved to the upper movement limit position. It is necessary to switch the rod 24 to the unlocking position P2 positively, but after the load support base 4 is in the horizontal lying posture, the operating member 35 is switched to the lower movement limit position and the rod 24 is moved. When the rod 24 is switched to the locking position P1, when the rod 24 gets over the upper protruding corner portion 37b between the straight portion of the through-hole 37 and the bent portion 37a at the upper end, the bent portion is obtained so as to obtain a click effect due to resistance. 37a is formed and vibrated In it is possible to prevent the operating member 35 that flapping up and down.

  Although the rod guide 34 of the load support base 4 and the through hole 37 of the operation member 35 are illustrated as being formed by horizontal horizontal drilling with respect to the load support base 4 and the operation member 35, When the support base 4 and the operation member 35 are formed of synthetic resin, the rod guide 34 and the through hole 37 can be simultaneously formed when the load support base 4 and the operation member 35 are formed by a mold divided into upper and lower parts. It is. In the above embodiment, at least the foremost reinforcing steel pipe 20a of the load support base 4 is inserted into the shaft support hole of the operation member 35 so that the steel pipe insertion hole provided in the formed load support base 4 is provided. It is necessary to insert it from the side with respect to (one end can be a closed hole) and to incorporate it into the load support base 4. Similarly to the rod guide 34 and the like, the steel pipe insertion hole can be structured so that it can be simultaneously formed when the load support base 4 is formed by a forming die that is divided vertically.

It is a perspective view of the whole conveyance trolley in use condition. It is a top view of the folded conveyance trolley. It is a cross-sectional top view in the state which separated the load support stand. It is a vertical front view which shows a load support stand latching device. It is a vertical side view which shows an example of the latching | locking part between a rod and a rod removal prevention member. It is a vertical side view in the inner side position of the left side panel which shows a load support stand and a load support stand locking device. It is a figure which shows a part of load support stand same as the above in the longitudinal section. Fig. A is a longitudinal side view of the load support base locking device at the operation member position, and Fig. B is a view in a state where the operation member of Fig. A is lifted to the upper movement limit position. It is a vertical side view which shows the principal part of a state when raising and raising the load support stand which was cancelled | released.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Back panel 2 Left panel 3 Right panel 4 Load support stand 5 Lower side member 6 Portal frame 9a-9d Wheel 10a-10d Wheel mounting seat 11-11, 15, 32 Bolt nut 14, 16 Vertical pin 17, 31 Notch portions 18 and 19 Connecting members 20a to 20c Reinforcing steel pipes 21, 22, 26 and 27 Projecting pieces 23 for bearings 23 Load support base locking device 24 Rod 25 Operating means 28 Horizontal support shafts 29a and 29b Locking pieces 30 Stopper mounting seats 33a, 33b Opening 34 Rod guide 35 Operation member 35a Operation member front end 36 Notch recess 37 Through hole P1 Locking position P2 Lock release position 38 Rod retaining member 39 Recess 40 Locking part 40a Annular groove 40b annular protrusion 42 protrusion

Claims (7)

  Left and right horizontal horizontal rods supported parallel to the front side of the load support base that is pivotally supported on the lower side of the back panel so that it can be raised and lowered, and the left and right sides of the load support base are both left and right A pair of locking pieces erected on the left and right side panels so as to be engageable with both ends of the rod when the load support is in a horizontal lying posture supported by the lower side of the panel, and the rod, The operation means is configured to translate in the front-rear horizontal direction between a locking action position for engaging with the locking piece and a locking release position detached from the locking piece, and the operating means is provided on the load support base. And a rod guide that supports the rod so as to be movable in the front-rear and horizontal directions, and an operation member provided on the front side of the load support table, and the operation member is provided on a front side of the load support table. Fitted loosely in the notch recess and the rear side is pivotally supported so that it can swing up and down A through hole through which the rod penetrates, and the through hole moves the rod from the locking action position to the unlocking position when the operating member moves up from the lower movement limit position that is flush with the upper surface of the load support base. And supporting the load of the collapsible transport cart configured to move the rod from the locking release position to the locking action position when the operating member moves down from the upper limit position. Stand locking device.   The rod reaches a locking position where the rod engages with the locking piece when the back panel is moved backward, and is disengaged from the locking piece when the rod moves forward on the side opposite to the side with the back panel. It is comprised so that it may reach a latch release position, The through-hole of the said operation member is comprised by the slanting long hole shape inclined so that the front side on the opposite side to the side with a back panel may fall. The load support stand locking device of the foldable transport cart as described.   The load support of the foldable transport carriage according to claim 2, wherein the operation member includes a thick front end portion whose bottom side protrudes downward, and the through hole is provided in the thick front end portion of the operation member. Stand locking device.   A protrusion is formed on the bottom surface side of the load support base so as to surround the notch recess in which the operation member is loosely fitted in a U shape. The entire operation member including the thick front end protrudes downward from the protrusion. The load support base locking device of the foldable transport carriage according to claim 3, wherein the load support base locking device is configured to prevent the folding support carriage from being folded.   The rod guide is configured to penetrate between the left and right sides of the load support base, and the rod is inserted into the rod guide from one end so as to pass through the through hole of the operation member. The load support base of the foldable transport carriage according to any one of claims 1 to 4, wherein the side is provided with an opening that overlaps both ends of the rod and into which the locking piece is loosely fitted. Locking device.   The load support base is provided with a recessed portion that is open on the lower side so as to overlap the rod guide, and a rod retaining member is loosely fitted in the recessed portion, and the rod includes the through hole of the operation member and the rod. The rod guide is inserted from one end so as to pass through the through-hole of the retaining member, and the rod retaining member and the rod are engaged with each other by press-fitting the rod, so that the axial relative movement of both of them is The load support base locking device of the foldable transport carriage according to claim 5, wherein a locking portion for preventing the load is provided. In the load support base, left and right horizontal reinforcing steel pipes are embedded at appropriate intervals in the front-rear direction, and the operating member is supported on the foremost reinforcing steel pipe among the reinforcing steel pipes so as to swing up and down. The load support stand locking device for a foldable transport carriage according to any one of claims 1 to 6.

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