JP2008062726A - Load supporting base locking device for folding cart - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve operation property of a load supporting base locking device capable of locking a load supporting base supported to rise and fall down freely into both right and left panels at horizontally fallen-down and lying-flat attitude. <P>SOLUTION: In this load supporting base locking device, an operation lever 35 provided on a front side of the load supporting base 4 is provided with an inclined long hole 37 for switching a position between a locking release position P2 where a lock bar 24 is disengaged from a lower side of a locking piece 29a and a locking action position P1 where the lock bar 24 is engaged with the lower side of the locking piece 29a. The whole region between both ends of the inclined long hole 37 is linear, and the locking piece 29a has a hook part 43 provided with an inclined upper side 43a lowering its tip to move the lock bar 24 from the locking action position P1 to the locking release position P2 when the load supporting base 4 turns and falls down to the horizontally fallen-down and lying-flat attitude. A projecting part 43b for preventing coming-off facing downward is provided on a tip lower side of the hook part 43. <P>COPYRIGHT: (C)2008,JPO&INPIT

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 supported by the left and right side panels by turning the load support base pivotally supported on the lower side of the back panel downward and downward. 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 Patent Document 1, the device urges and holds a lock bar, which is mounted on the front side of the load support base so as to be able to move in parallel in the front-rear direction, at a locking action position of the rearward movement limit by a spring. A locking piece that engages the left and right ends of the lock bar when the table is turned to the horizontal lying position protrudes from the lower sides of the left and right panels, and the load support table is placed over the back panel. To engage with the lock bar When to release the engagement between the pieces were those moved in parallel against the lock bar to the biasing force of the spring to the unlocked position of the forward movement limit.
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 lock bar movable in parallel in the front-rear direction is essential, and the number of parts is In addition to the complex and costly disadvantages of the structure, the direction of operation when moving the lock bar to the unlocking position is different from the direction of lifting when the load support base is lifted up. In addition, the two-stage operation is required to move the lock bar to the unlocking position and the operation to lift the load support base in different directions, and the operation to move the lock bar to the unlocking position is the load support. Since it is performed from the top of the table, even after the lock is released, even if the load support table can be moved up with the hand that operated the lock bar, the load support table must be lifted instead of lifted. Since, in order to move upward to the upright position that overlaps the load support stand on the back panel 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. Is attached to the lower side of the back panel 1, and the horizontal support posture in which the left and right sides are supported by the lower sides of the left and right panels 2 and 3. The load support base locking device for locking to the left and right side panels 2 and 3 is supported by the load support base 4 so as to be movable in parallel in the front-rear direction when the load support base 4 is in a horizontal lying posture. The left and right horizontal and horizontal lock bars 24, a pair of locking pieces 29 a and 29 b erected on the left and right side panels 2 and 3 so as to be engageable with both ends of the lock bar 24, and the front side of the load support base 4 And an operation lever 35 supported on the side so as to be swingable up and down. -35 moves the lock bar 24 to the unlocking position P2 released from the lower side of the locking pieces 29a and 29b by the upward movement of the operating lever 35 and moves the lock bar 24 by the downward movement of the operating lever 35. A load support base locking device provided with an inclined long hole 37 through which the lock bar 24 penetrates to move the bar 24 to a locking position P1 that engages the lower side of the locking pieces 29a and 29b. The inclined elongated hole 37 has a linear shape at both ends thereof, and the locking pieces 29a and 29b are provided on the lock bar 24 when the load supporting base 4 is turned to the horizontal lying posture. Has a hook portion 43 having an inclined upper side 43a that is lowered at the tip end, and moves downward from the latching operation position P1 to the latch release position P2, and a downward protrusion prevention projection 43b is provided below the tip end of the hook portion 43. And When the support base 4 is in the horizontal lying posture and the lock bar 24 is in the locking action position P1, the lock bar 24 is located on the inner side of the detachment preventing projection 43b and below the locking piece hook portion 43. It is configured to enter the side.

  In carrying out the present invention having the above-described configuration, specifically, as described in claim 2, the lock bar 24 is disengaged from the locking piece hook portion 43 when the load supporting base 4 is in a horizontal lying posture. It can be configured such that it is at a lower height than the prevention convex portion 43b and does not interfere with the detachment prevention convex portion 43b when the lock bar 24 is moved back and forth by the operation lever 35.

  According to a third aspect of the present invention, the lock bar 24 reaches the locking action position P1 that engages with the locking pieces 29a and 29b by the rearward movement of the back panel 1, and the back panel 1 It is configured so as to reach the unlocking position P2 where it is disengaged from the locking pieces 29a, 29b by moving forward on the opposite side to a certain side, and the inclined elongated hole 37 of the operating lever 35 is provided on the back panel 1. It can be inclined so that the front side opposite to the side is lowered. In this case, as described in claim 4, the operation lever 35 is provided with a thick front end portion 35 a whose bottom surface protrudes downward, and the inclined long hole 37 is formed in the thick front end portion 35 a of the operation lever 35. Can be provided. Further, in this case, as described in claim 5, 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 lever 35 is loosely fitted in a U shape. The entire operation lever 35 including the thick front end 35a can be configured not to protrude downward.

  According to a sixth aspect of the present invention, the load support base 4 is formed with a lock bar guide 34 through which the lock bar 24 is loosely fitted so as to be movable in parallel between the left and right sides of the load support base 4. The lock bar 24 is inserted into the lock bar guide 34 from one end so as to pass through the inclined elongated hole 37 of the operation lever 35, and both end portions of the lock bar 24 are provided on the left and right sides of the load support base 4. Overlapping and opening portions 33a, 33b can be provided in which the locking pieces 29a, 29b are loosely fitted. In this case, as described in claim 7, the load support base 4 is provided with a recessed portion 39 that is open on the lower side so as to overlap the lock bar guide 34, and the lock bar retaining member 38 is provided in the recessed portion 39. The lock bar 24 is inserted into the lock bar guide 34 from one end so as to pass through the inclined long hole 37 of the operation lever 35 and the through hole 38a of the lock bar retaining member 38, and the lock bar 24 The bar retaining member 38 and the lock bar 24 may be provided with a locking portion 40 that engages with each other by press-fitting the lock bar 24 and prevents relative movement in the axial direction therebetween.

  Furthermore, as described in claim 8, in the load support base 4, left and right horizontal reinforcing steel pipes 20a to 20c are embedded at appropriate intervals in the front-rear direction, and the operation lever 35 is connected to the reinforcing steel pipes 20a to 20c. Of 20c, it can be supported on the foremost reinforcing steel pipe 20a so as to be swingable up and down. Further, according to a ninth aspect of the present invention, the operation lever 35 has a lock located at the locking action position P1 on the side of the movement path of the lock bar 24 between the locking action position P1 and the locking release position P2. A lock bar climbing protrusion 44 can be provided at a position adjacent to the bar 24.

  In addition, as described in claim 10, the operation lever 35 is configured to be urged in the downward movement direction only by its own weight without using a spring for urging the operation lever 35 in the downward movement direction. In addition, a spring that urges the lock bar 24 to the locking position can be used without using it.

  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. Since the operation lever provided on the front side is lifted upward, the lock bar on the load support base side is released from the locking pieces on the left and right side panels, and then lifted to the upper limit position. By lifting the load support base as it is through the lever, 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, the operation lever is urged and held at the lower limit position by its own weight even if it is not urged by a spring, so that the operation of moving the lock bar between the locking action position and the locking release position is performed. The means can be configured by simply pivotally supporting an operation lever having a slanted long hole on the front side of the load support base so as to be swingable up and down, so that the number of parts is small and the structure is simple and inexpensive. .

  Furthermore, according to the configuration of the present invention, the inclined elongated hole provided in the operation lever for moving the lock bar between the locking action position and the locking release position is linear in the entire area between both ends. This makes it easier to produce the control lever, but on the other hand, the lock bar moves under the hook of the latching piece while the control lever is moving upward due to vibration when lifting the load support platform with a forklift and carrying it. The lock bar is removed from the locking piece, the locking of the load support base and the left and right side panels is released, and the normal state of the transport carriage is changed. There is a risk of falling into an abnormal situation where it cannot be maintained. However, according to the configuration of the present invention, even if the above situation occurs, the lock bar that moves from the locking action position to the start release position while slidingly contacting the lower side of the hook portion of the locking piece is Since it is finally prevented from coming off from the hook part tip by coming into contact with the protrusion for preventing detachment provided on the lower side of the hook part, the load support base and the left and right side panels are unlocked. The abnormal situation of being lost can be avoided, and safety is greatly improved.

  When carrying out the present invention, the lock bar when the load supporting base is in the horizontal lying posture is higher than the protrusion for preventing the locking piece hook from coming off, that is, the lock bar is moved back and forth by the operation lever. When it is configured to be located at a height that interferes with the detachment preventing convex portion, when the lock bar is moved back and forth between the locking release position and the locking action position by the operation lever, It can also be configured such that both ends of the lock bar get over the detachment preventing convex portion while being bent and deformed against the elasticity. However, according to the configuration of the second aspect, the lock bar only needs to be supported so as to be movable only in the front-rear direction over the entire length thereof, and the guide structure of the lock bar is simplified, and the material constituting the lock bar Size is less constrained. Furthermore, the operation of switching the position of the lock bar by the operation lever can be easily performed.

  Further, according to the present invention, the inclined long hole of the operation lever is formed into a long hole shape that is inclined upward, so that when the operation lever is swung upward, the lock bar is moved backward in parallel and detached from the locking piece. According to the configuration of claim 3, the front and rear of the operation lever for securing the amount of movement of the lock bar between the locking action position and the locking release position can be achieved. The amount of lifting operation up to the direction length and the upper limit position can be reduced, and the operation lever can be made compact and good operability can be obtained.

  Further, when the configuration according to claim 3 is adopted, according to the configuration according to claim 4, the wall thickness front end portion of the operating lever for forming the long hole-shaped through hole inclined forward and downward is provided. It can be used as a handle portion protruding to the bottom surface side, and the unlocking operation by lifting the operation lever from the bottom surface side and the subsequent operation of raising the load support base can be easily and reliably performed at the hand. In this case, further, according to the configuration described in claim 5, even if the thickness front end portion of the operation lever protrudes downward from the bottom surface level of the load support base, the notch recess in which the operation lever is loosely fitted is provided. 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 lever 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 6, although the assembly of the lock bar to the lock bar guide of the load support base and the operation lever can be performed very easily and easily, the structure of Claim 7 should be used together. Thus, although the lock bar can be easily and easily assembled, the lock bar can be reliably held at a predetermined position in the load support base.

  Moreover, according to the structure of Claim 8, since a part of reinforcement steel pipe embed | buried under a load support stand can be utilized as a spindle which supports an operation lever, it is useful also for the further reduction of a number of parts. At the same time, the shaft support strength of the operation lever can be increased. According to the ninth aspect of the present invention, the operation lever is moved downward to move the lock bar from the lock release position to the lock operation position, thereby locking the load support base to the left and right side panels. When the operation is performed, the resistance when the lock bar gets over the overhanging protrusion provided on the operation lever can give the operator a click feeling and make sure the lock operation is performed. it can.

  Furthermore, according to the structure of Claim 10, it can comprise without using springs at all, and can aim at cost reduction. Further, the upward movement operation of the operation lever when performing the locking operation for moving the lock bar from the locking release position to the locking action position can be easily performed. When the operating lever is not forcibly biased in the downward movement direction by the spring as described above, the operating lever may easily move up and down by vibration, but the configuration of the present invention according to claim 1 is premised. Therefore, even when the operation lever vibrates up and down due to vibration when lifting and transporting the load supporting table with a forklift, there is no possibility that the lock will be released.

  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, the vertical pin 14 is concentrically fitted in the rear column portion 6 b of the portal peripheral frame 6 of the left panel 2, and the vertical pin 16 is the portal shape of the right panel 3. It fits concentrically in the rear column 6b of the peripheral frame 6.

  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 that allows 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. Two nearby locations can be vertically raised and lowered on the lower side member 5 of the back panel 1 via hinges 21 and 22 having left and right horizontal support shafts 28 (see FIGS. 6, 7 and 9) concentric with each other. Is pivotally supported. In addition, a lock bar 24 and an operation means 25 constituting a locking device 23 are provided in the vicinity of the front side of the load support base 4.

  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 end portions of the lock bar 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 12. The locking pieces 29 a and 29 b have a tip at the side where the back panel 1 is located as shown in FIGS. 4 and 9 to 12. Is provided with a hook portion 43 protruding forward on the opposite side and a mounting seat 30 bent outward from the lower end, and the upper side of the hook portion 43 forms an inclined upper side 43a with a tip lowered. A downward detachment preventing convex portion 43 b is formed on the lower side of the tip of the hook portion 43. Thus, as shown in FIGS. 3 and 4, the locking pieces 29a and 29b have mounting seats 30 which are the lower side members 5 of the left and right side panels 2 and 3, and the wheel mounting seats 10c and 10d. In a state of being sandwiched between the two, the wheel mounting seats 10c and 10d are fastened together by two bolt nuts 12 and 13 for fixing the wheel mounting seats 10c and 10d to the lower side member 5.

  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 lock bar 24 is made of a round bar material parallel to the front side of the load support base 4, and is inserted into a lock bar 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 lock bar guide 34 is a long hole in the front-rear direction provided in parallel with the front side of the load support table 4, and both ends of the lock bar guide 34 are provided on the load support table 4. The lock bar 24 opened to both the left and right sides and inserted into the lock bar guide 34 has a length that does not protrude from the load support base 4 to the left and right, and both end portions thereof traverse the openings 33a and 33b. is doing.

  Thus, as shown in FIGS. 6 and 7, the lock bar guide 34 engages with the locking pieces 29a and 29b when the load supporting base 4 is in the horizontal lying posture (the locking pieces 29a). , 29b, which enters the lower side of the hook portion 43), and enables a parallel movement in the front-rear direction between the locking action position P1 and the locking release position P2 released from the locking pieces 29a, 29b. . The operation means 25 includes the lock bar guide 34 and an operation lever 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 lever 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. An inclined long hole 37 through which the lock bar 24 passes is provided in the thick front end portion 35a. As shown in FIGS. 8B and 8C, the inclined long hole 37 is configured to move the lock bar 24 to the locking action position when the operation lever 35 moves upward from a lower movement limit position that is flush with the upper surface of the load support base 4. While moving from P1 to the lock release position P2, when the operation lever 35 is moved downward from the upper limit position, the lock bar 24 is moved downward from the lock release position P2 to the lock action position P1. Inclined.

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

  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 29a and 29b on the left and right side panels 2 and 3 are fitted into the openings 33a and 33b on the load support base 4 side, and FIG. As shown in FIG. 4, the operation lever 35 has an upper surface at the lower limit of movement that is flush with the upper surface of the load support table 4, and the rear end of the lock bar guide 34 on the load support table 4 side and the operation lever 35 side. The rear upper end of the inclined long hole 37 is in a state of overlapping in a side view. The lock bar 24 on the load support base 4 side is held in a common hole portion in a side view of the lock bar guide 34 and the inclined elongated hole 37 on the operation lever 35 side. The lock bar 24 is held at the locking position P1, and both ends of the lock bar 24 are located below the tip hook portions 43 of the locking pieces 29a and 29b and into the inner side of the detachment preventing projection 43b. Further, at this time, as shown in FIG. 8A, the lock bar 24 is configured to be positioned below the detachment preventing convex portion 43 b of the tip hook portion 43 of the locking pieces 29 a and 29 b.

  Therefore, in this state, the upright movement of the load supporting base 4 is prevented by the both ends of the lock bar 24 and the hooks 43 of the locking pieces 29a and 29b on the left and right side panels 2 and 3 side. The entire load carrier 4 can be lifted up to lift and move the entire carriage. Thus, when the transport carriage is on the floor surface, the lock bar 24 at the locking position P1 is moved from the lower side of the hook portion 43 of the locking pieces 29a and 29b as shown in FIG. 8A. Since it is located at least as low as the height of the protrusion 43b for preventing detachment, when the load support base 4 is lifted by a forklift as described above, the load support base 4 is slightly lifted as shown in FIG. Thus, the lock bar 24 comes into contact with the lower side of the hook portion 43. When the transfer carriage vibrates up and down due to vibrations associated with the forklift, the lock bar 24 moves forward (toward the unlocking position P2) with the upward movement of the operation lever 35, and the lower side of the hook portion 43. However, the lock bar 24 finally comes into contact with the protrusion 43b for preventing detachment on the lower side of the tip of the hook portion 43 as shown in FIG. It is refused to come forward from the tip. That is, the locked state between the load support base 4 and the left and right side panels 2 and 3 is securely held.

  The operation lever 35 is provided with a thick front end portion 35a that protrudes downward on the bottom side because of the need to provide a forward and downward inclined elongated hole 37. The operation lever including this thick front end portion 35a is provided. If the entire 35 is configured to be within the thickness range of the load support base 4, the entire load support base 4 becomes thick, which causes an increase in weight and cost. Accordingly, only the thick front end portion 35a of the operation lever 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 a 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 lever 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 FIGS. 4, 8 </ b> B, and 8 </ b> C, protruding portions along the three sides of the notch recess 36 in which the operation lever 35 is loosely fitted on the bottom surface side of the load support base 4. 42 is formed so that the entire operation lever 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 supporting 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 lever 35 with respect to the load support base 4 even in a situation where the forks cross.

  The unused carriage can be folded into an L shape in plan view as shown in FIG. That is, as shown in FIG. 8B, the operation lever 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 lever 35 is used as a reinforcing steel pipe as a support shaft. When rotated upward around 20a, as shown in FIG. 8C, the longitudinally long lock bar guide 34 on the load support base 4 side and the inclined elongated hole 37 on the operation lever 35 side overlap in side view. Since the portion (common hole) moves forward along the lock bar guide 34, the lock bar guide 34 and the inclined elongated hole 37 are held by the overlapping portion (common hole) in a side view. The lock bar 24 is moved forward in the lock bar guide 34 and switched from the locking position P1 to the locking release position P2. The forward movement of the lock bar 24 at this time is performed lightly and smoothly without interfering with the detachment preventing projection 43b projecting to the lower side of the front end of the hook portion 43 of the locking pieces 29a, 29b.

  As described above, when the operation lever 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 lever 35 with the hand. It becomes a grip part where the hand is caught when performing the operation, and the operation becomes easy.

  By the above operation, both end portions of the lock bar 24 are disengaged forward from the front end hook portions 43 of the locking pieces 29a and 29b on the left and right side panels 2 and 3, so that the load support base 4 can be lifted. The load support 4 can be lifted up with respect to the back panel 1 around the horizontal support shaft 28 as shown in FIG. 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 left column 3 and the back panel 1 support the load in an upright position by horizontally rotating toward the right panel 2 around the rear column 6b (vertical pin 16) of the portal peripheral frame 6. 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. The lower side of the side member 5).

  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 left and right sides are placed on the lower side members 5 of the left and right side panels 2 and 3 by being turned downward, but the lower limit position where the operation lever 35 has fallen with respect to the load support base 4. Alternatively, the lock bar 24 is moved to the locking action position P1 side when it is in the vicinity thereof, so that the lock bar 24 is in the hook portions 43 of the locking pieces 29a and 29b on the left and right side panels 2 and 3 side. It will be lowered onto the inclined upper side 43a. By subsequently turning the load supporting base 4 to the horizontal lying posture, the lock bar 24 is forcibly moved forward by the inclined upper side 43a of the hook portion 43, and the operation lever 35 is moved upward as shown in FIG. It will be.

  When the load supporting base 4 is in a horizontal lying posture supported by the left and right side panels 2 and 3, the lock bar 24 is in a position that is disengaged forward and downward from the tip of the hook portion 43 (locking release position P2). Although the lever 35 is in the upwardly moved state, after that, the operation lever 35 is turned down by its own weight and the lock bar 24 is automatically switched to the locking operation position P1, so that the operation lever 35 is moved downward. It is not possible to expect because there are no springs forcibly biasing in the direction. In such a case, as shown in FIG. 12, the operation lever 35 is stepped down with the tip of the foot to forcibly fall down to the lower movement limit position, whereby the lock bar is moved by the relative vertical movement of the inclined long hole 37 and the lock bar guide 34. 24 is forcibly moved rearward and switched to the locking action position P1 that has entered the lower side of the hook portion 43. Also at this time, the protrusion 43b for preventing detachment on the lower side of the tip of the hook portion 43 and the lock bar 24 do not interfere with each other.

  Of course, when the load support base 4 is switched to the horizontal lying posture, if the operation lever 35 is held by hand, the operation lever 35 naturally moves to the upper limit position with respect to the load support base 4, and the lock bar 24 is engaged. Since the load support base 4 reaches the horizontal lying posture in the state where it is switched to the stop release position P2, the collision between the lock bar 24 and the inclined upper side 43a of the hook portion 43 as described above can be avoided.

  As shown in FIGS. 13 and 14, the operation lever 35 has a lock bar 24 located at the locking action position P1 on the side of the movement path of the lock bar 24 between the locking action position P1 and the locking release position P2. A lock bar overhanging projection 44 can be provided at a position adjacent to the projection. The illustrated operating lever 35 is formed with two upper open recessed portions 35b and 35c parallel to the portion through which the lock bar 24 penetrates, and inclined long holes 37 are formed in the left and right side wall portions 35d and 35e and the central partition wall portion 35f. The lock bar overhanging protrusions 44 are provided below the inclined elongated holes 37 on both the left and right sides of the central partition wall portion 35f. When such a lock bar overhanging projection 44 is provided, when the operation bar 35 is stepped down and the lock bar 24 is switched from the locking release position P2 to the locking action position P1, the lock bar 24 is locked. Immediately before reaching P1, resistance due to contact with the lock bar overpass projection 44 is received, and the operator depresses the operation lever 35 against this resistance, so that the lock bar 24 protrudes over the lock bar over projection. When the user clicks over 44, the click feeling can be recognized when the click is locked, and a reliable locking operation is facilitated. The recessed portions 35b and 35c that are open on the upper side can be closed with a cover plate 35g.

  In the illustrated examples shown up to FIG. 12, the load support 4 and the operation lever 35 are not illustrated with recessed portions or through-hole portions for reducing unnecessary meat portions for material reduction and weight reduction. In practice, these recessed portions and through-hole portions are appropriately arranged and molded. Further, the lock bar guide 34 also actually has the lower half of the upper side opened and the upper half of the lower side opened in the axial direction when the load supporting base 4 is molded by a mold divided into upper and lower parts. It is possible to arrange them alternately.

It is a perspective view of the whole conveyance trolley in use condition. It is a top view of the folded conveyance trolley. FIG. 3A is a partially cutaway plan view of a transport carriage in use, and FIG. 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 lock bar and a lock bar 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. 7A is an enlarged view of the main part of FIG. 7, FIG. B is a longitudinal side view of the main part at the operation lever position, and FIG. C is a view in a state where the operation lever of FIG. 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. It is a vertical side view of the principal part which shows the change of the latching device when a load support stand is lifted with a forklift. It is a vertical side view of the principal part showing the change of the locking device when the load support base is turned to the horizontal lying posture. It is a vertical side view of the principal part which shows a mode when the operation lever is stepped down from the state of FIG. It is a vertical side view which shows the modification of an operation lever. It is a cross-sectional top view of the operation lever which concerns on the modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Back panel 2 Left side panel 3 Right side panel 4 Load support stand 5 Lower side member 6 Portal frame 9a-9d Wheel 10a-10d Wheel mounting seat 14,16 Vertical pin 18,19 Connecting member 20a-20c Steel pipe for reinforcement 21 and 22 Hinge 23 Load support base locking device 24 Lock bar 25 Operating means 28 Horizontal support shafts 29a and 29b Locking piece 30 Locking piece mounting seats 33a and 33b Opening 34 Lock bar guide 35 Operation lever 35a Operation lever front end 36 Notch concave portion 37 Inclined elongated hole 38 Lock bar retaining member 39 Recessed portion 40 Engaging portion 40a Annular groove 40b Annular protrusion 42 Protruding portion 43 Hook portion 43a of the locking piece Inclined upper side 43b Protrusion portion 44 for preventing detachment Lock bar Override projection P1 Locking position P2 Locking release position

Claims (10)

  Load support for locking the load support platform pivotally supported on the lower side of the back panel to the left and right side panels in a horizontal lying posture where the left and right sides are supported by the lower sides of the left and right side panels. It is a table locking device, and a horizontal and horizontal horizontal lock bar supported by the load support table so as to be movable in parallel in the front-rear direction when the load support table is in a horizontal lying posture, and both ends of the lock bar A pair of locking pieces erected on the left and right side panels so as to be engageable with each other and an operation lever supported on the front side of the load support base so as to be swingable up and down. A locking action of moving the lock bar to the unlocking position released from the lower side of the locking piece by upward movement and engaging the lock bar to the lower side of the locking piece by lowering the operation lever The lock bar penetrates to move to a position In the load support base locking device provided with the inclined long holes, the inclined long holes are linear in the entire area between both ends thereof, and the locking pieces have the load support base in a horizontally lying posture. A hook portion having a sloping upper side with a tip end that moves the lock bar from the locking action position to the locking release position when it is turned over is provided. When the load support base is in a horizontal lying posture and the lock bar is in the locking action position, the lock bar is located on the inner side of the detachment prevention convex portion and below the locking piece hook portion. A load support stand locking device for a foldable transport cart entering the side.   The lock bar when the load support base is in a horizontal lying posture is at a height lower than the protrusion for preventing the locking piece hook part from coming off, and when the lock bar is moved back and forth by the operation lever, 2. The load support base locking device for a foldable transport carriage according to claim 1, wherein the load support base locking device is configured not to interfere with a detachment prevention convex portion.   The lock bar reaches a locking position where the locking bar engages with the locking piece by moving the back panel to the rear, and is detached from the locking piece by moving to the front opposite to the side with the back panel. The folding long hole of the operation lever is inclined so that the front side opposite to the side with the back panel is lowered. A load carrying table locking device for a carriage for universal conveyance.   4. The load support base of the foldable transport cart according to claim 3, wherein the operation lever includes a thick front end portion whose bottom side protrudes downward, and the inclined long hole is provided in the thick front end portion. Stop device.   On the bottom surface side of the load support base, a protrusion is formed that surrounds a notch recess in which the operation lever is loosely fitted in a U shape, and the entire operation lever including the thick front end portion does not protrude downward from this protrusion. The load support base locking device of the foldable transport carriage according to claim 4 configured as described above.   A lock bar guide, in which the lock bar is loosely fitted so as to be able to move in parallel, passes through the left and right sides of the load support base, and the lock bar passes through the inclined elongated hole of the operation lever. The lock bar guide is inserted from one end so that both left and right sides of the load support base are provided with openings that overlap with both ends of the lock bar and into which the locking pieces are loosely fitted. The load support stand locking device of the foldable transport cart according to any one of 1 to 5.   The load support base is provided with a recessed portion that is open on the lower side so as to overlap with the lock bar guide, and a lock bar retaining member is loosely fitted in the recessed portion, and the lock bar has an inclined length of the operation lever. The lock bar guide is inserted from one end so as to pass through the hole and the through hole of the lock bar retaining member, and the lock bar retaining member and the lock bar are engaged with each other by press-fitting the lock bar. The load support base locking device for a foldable transport carriage according to claim 6, wherein a locking portion that prevents relative movement in the axial direction of the both 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 lever 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 7.   The operation lever has a lock bar overhanging protrusion projecting at a position adjacent to the lock bar in the locking action position on the side of the movement path of the lock bar between the locking action position and the locking release position. The load support stand locking device for a foldable transport carriage according to any one of claims 1 to 8.   The foldable transfer according to any one of claims 1 to 9, wherein the operation lever is urged in the downward movement direction only by its own weight, and a spring for urging the lock bar to the locking action position is not used together. Cargo load support stand locking device.

Images