JP2007112453A - Apparatus for locking door panel of box-shaped pallet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve locking function of a door panel under a closed condition in a box-shaped pallet. <P>SOLUTION: In an apparatus for locking the door panel, a locking means 11 for locking the freely openable/closeable door panel 5 at a closing position is composed of: a locking pin 16 supported so that it is movable forward and backward in the pin lengthwise direction, and is rotatable around the pin axial center between an advancing position where it is engaged to a part 14 to be locked projected from a side panel side, and a retreating position separated from the part 14 to be locked; and a handle part 17 provided in a continuity with this locking pin 16. This locking means 11 is provided with a pair of engaging parts 22 and 23 which engage two longitudinal materials 13b and 13d on the door panel 5 side to position the locking pin 16 in an advancement position. A handle part hanging posture holding means which makes rotational resistance of the handle part 17 maximum just before the hanging posture is constituted of: at least one engaging part 22 among a pair of engaging parts 22 and 23; and a cylindrical peripheral face of the longitudinal material 13b on the door panel 5 side with which the engaging part 22 is brought into contact. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a box-type pallet having a door panel that can be freely opened and closed, and more particularly to a locking device for the door panel.

  As a box-type pallet provided with a door panel, as disclosed in Patent Document 1, it is provided with a door panel that can be freely opened and closed, and a locking means that locks the door panel in a closed state. Between the advancing position for engaging with the locked portion on the side panel adjacent to and the retracted position for releasing from the locked portion, and is movable in and out in the pin length direction and around the pin axis. The lock pin is supported by the door panel so as to be capable of rotating, and a handle portion connected to the lock pin, and the handle is in the advanced position where the lock pin engages with the locked portion. A box-type pallet is known in which the handle is adjacent to a vertical member on the door panel side to prevent the lock pin from moving backward when the section is rotated in a hanging position along the outside of the door panel. ing.

As a method of using this type of box-type pallet, there is known a method of using an inner bag set in the pallet and storing roses such as grains in the inner bag. When using the pallet in such a way, when taking out the contents of the inner bag, the pallet is picked up by the reversing machine provided with the forklift and turned upside down, and the contents are opened from the inner bag mouth facing downward. When the pallet is turned upside down, the handle that is in the suspended position and holds the lock pin in the advanced position (lock position) is reversed upside down by gravity. Then, the lock with respect to the lock pin is released. In this state, the lock pin slides in the unlocking direction due to vibration when handling the pallet, and the door panel may be unlocked unexpectedly. Therefore, the door panel may open during the work of lifting the pallet with a forklift and turning it over, or when the pallet is returned to the upright position with the door panel unlocked. An abnormal situation with danger will occur. As a means to solve such problems, as described in Patent Document 2, the handle portion is biased and held in a suspended position with respect to the pallet by a spring, and the handle portion is unlocked even if the pallet is turned upside down. It is known to be configured so as not to rotate to a posture.
No. 8-2101 Japanese Utility Model Publication No. 50-5460

  The conventional box-type pallet adopting the configuration described in Patent Document 2 as described above requires a separate part such as a spring and its mounting work, thus avoiding a significant increase in the cost of the door panel locking device. Not only is there a possibility of malfunction due to deterioration or breakage of the spring. Also, if a reliable operation is expected, the spring becomes strong, and as a result, the operability at the time of normal unlocking is deteriorated.

  The object of the present invention is to provide a door panel lock device for a box-type pallet that can solve the above-mentioned conventional problems, and the means is given the reference numerals of the embodiments described later. As shown, the door panel 5 includes a door panel 5 that can be opened and closed and a locking means 11 that locks the door panel 5 in a closed state. The locking means 11 protrudes from the side panels 2 and 3 adjacent to the door panel 5. Between the advancing position engaged with the locked portion 14 and the retracted position disengaged from the locked portion 14 so as to be movable in and out in the pin length direction and capable of rotating around the pin axis. A lock pin 16 supported by the door panel and a handle portion 17 connected to the lock pin 16 are provided. The locking means 11 includes the handle portion with the lock pin 16 in the advanced position. 17 in a hanging position along the door panel 5 A pair of engaging portions 22 and 23 for engaging the two vertical members 13b and 13d on the door panel 5 side to position the lock pin 16 at the advanced position when rotated together with the door 16 are provided. At least one of the engaging portions 22, 23, and the columnar peripheral surface of the vertical member 13 b on the door panel 5 side with which the engaging portion 22 abuts, the grip portion 17 is immediately before the hanging posture. A handle portion hanging posture holding means for maximizing rotational resistance is configured.

  In practicing the present invention with the above-described configuration, specifically, as described in claim 2, at least one of the pair of engaging portions 22, 23 protrudes from the lock pin 16. The projection 21 can be an engagement portion 22 that constitutes the handle portion hanging posture holding means.

  According to a third aspect of the present invention, the handle portion 17 is configured by fixing both longitudinal axis portions 17a and 17b of a bar material bent into a U-shape to the lock pin 16, and a pair of the engagement portions. One of the portions 22, 23 is constituted by one longitudinal axis portion 17 b of the handle portion 17, and the other one engaging portion 22 is a substantially semicircular protrusion 21 protruding from the lock pin 16. This protrusion 21 can constitute the engaging portion 22 constituting the handle portion hanging posture holding means.

  Further, when adopting the configuration according to claim 2, as described in claim 4, the lock pin 16 is a pair of left and right guide members 18, 19 attached to the outside of the door panel 5, that is, a bar. The material is bent into a semicircular shape and supported by a pair of left and right guide members 18 and 19 having lock pin support portions 18a and 19a projecting so that the lock pin 16 penetrates the inside, and the lock pin 16 advances. The protrusion 21 when in the position is positioned outside the one guide member 18 of the pair of guide members 18 and 19, and the intermediate portion between the hanging posture and the posture in which the handle portion 17 stands upright. The projection 21 can be configured to move through the lock pin support portion 18a of the guide member 18 only when it is at a certain angle.

  According to the door panel locking device of the box-type pallet having the door panel according to the present invention having the above-described configuration, the door panel is locked in the closed position by the engagement between the lock pin in the advanced position and the locked portion on the side panel side. In this state, the lock pin moves backward (in the unlocking direction) by fitting the pair of engaging portions on the locking means side, which is composed of the lock pin and the handle portion, and the two vertical members on the door panel side. Not only through the handle portion in the hanging position, but also at least one of the pair of engaging portions and the vertical position on the door panel side where the engaging portion abuts. The handle portion hanging posture holding means constituted by the cylindrical peripheral surface of the material is constant with respect to the rotation of the handle portion in the hanging posture in a direction (standing direction) for releasing the positioning at the advance position of the lock pin. The above resistance is given. In other words, unless the handle portion is rotated in the standing direction with an operation force sufficient to overcome the resistance provided by the handle portion hanging posture holding means, the positioning at the advanced position of the lock pin cannot be released. In addition to preventing the handle from simply hanging around due to vibration, etc., it is also possible to remove the contents from the inner bag when the inner bag is set on this box-type pallet and used to transport and store roses. Therefore, when the pallet is turned upside down, the handle does not rotate in the upside down position (standing position when viewed from the pallet side) due to gravity. Can be maintained.

  Therefore, the box-type pallet equipped with the door panel lock device according to the present invention has the pallet turned upside down in order to take out the contents from the inner bag even when the inner bag is set and used for transporting and storing roses. Therefore, it is possible to use the door panel safely without causing a dangerous abnormal situation in which the door panel is unexpectedly opened due to the reverse. In addition, biasing means such as a spring and a rubber belt instead of the spring are not required, and it can be carried out at a relatively low cost.

  In addition, according to the structure of Claim 2, the engaging part which comprises the said handle part drooping attitude | position holding means can be implement | achieved by simple structure, According to the structure of Claim 3, the said handle In order to constitute the drooping posture holding means, it is substantially only necessary to project one substantially semicircular protrusion on the lock pin, and the present invention can be implemented very easily and easily.

  Further, according to the configuration of claim 4, the force for holding the handle portion in the suspended posture is weakened due to wear or deformation of the engaging portion or the like constituting the handle portion hanging posture holding means after long-term use. Even if the handle portion is rotated in the upright direction when the pallet is inverted upside down, the lock pin is moved in the backward direction (if the handle portion is not at an intermediate fixed angle between the hanging posture and the standing posture). Since it cannot move in the unlocking direction), it is possible to more reliably avoid a dangerous situation in which the lock pin moves in the unlocking direction and the door panel is unexpectedly unlocked, and safety can be further improved.

  Hereinafter, a specific embodiment of the present invention will be described with reference to the accompanying exemplary drawings. In FIG. 1, reference numeral 1 denotes a rectangular loading base, and three right and left side panels 2 and 3 and a back are provided on three sides of the base. A panel 4 is erected, and a door panel 5 is erected on the remaining one side. Specifically, the back panel 4 is attached so as to be foldable so that its horizontal lower side overlaps with the rear side of the loading base 1 via a coil hinge on the loading base 1. The panels 2 and 3 are foldably attached so that the vertical rear side thereof overlaps the outside of the back panel 4 via the coil hinges 6 and 7 on both the right and left sides of the back panel 4. The lower half 5A is attached to the position where the horizontal lower side bent to the front side of the loading base 1 is close to the front and rear via the coil hinge 8, and the lower half 5A of the door panel is horizontal. The upper half 5B is attached to the upper side via a coil hinge 9 so as to be openable and closable in the front-rear direction. Therefore, the left and right side panels 2 and 3 are folded so as to overlap the outside of the back panel 4, and the back panel 4 is folded so as to be stacked on the loading base 1, and the door panel 5 is overlapped thereon. Can be folded.

  Under the four corners of the loading base 1, there are formed fork insertion spaces for forklifts and legs 10 that support the front and rear ends of the left and right side panels 2, 3 of the upper pallet when stacking the same pallet. It is installed. The upper folding pallet support for supporting the legs 10 of the upper folding pallet on each leg 10 so that the pallets in a state where the panels 2 to 5 are stacked on the loading base 1 can be stacked. In the pallet with protruding portions, the left and right side panels 2 and 3 are folded so as to overlap the inside of the back panel 4, and the back panel 4 is folded so as to be stacked on the loading base 1. The back panel 4 and the door panel 5 are attached to the load loading base 1 via a coil hinge so that the door panel 5 can be folded so as to overlap.

  Locking means 11 are disposed at two locations near the upper ends of both the left and right vertical sides of the lower half 5A of the door panel 5 and at two locations near the upper ends of the vertical left and right sides of the upper half 5B of the door panel 5. . Of these four locking means 11, the two locking means 11 in the vertical relationship are the same, the two locking means 11 in the left-right relationship are configured symmetrically, and the basic structure is all the same. It is. 2 to 9 illustrate the locking means 11 on the left side of the upper half 5B of the door panel 5.

  As shown in FIGS. 2 to 4, each of the panels 2 to 5 is composed of a cross member 12 made of a steel round bar disposed inside and a longitudinal member 13, 13 a made of a steel round bar placed outside. Are arranged in a grid pattern, and each of the cross members 12 and the vertical members 13 and 13a to 13e are conventionally well-known mesh structures constructed by fixing them together by welding at the intersections between them. Two cross members 12 are arranged and fixed in two rows inside and outside so that only the upper ends of the panels 2 to 5 sandwich the upper ends of the vertical members 13 and 13a to 13e. Moreover, the space | interval between the vertical material 13a of the right-and-left both sides of the door panel 5 and the vertical material 13b of the inside is narrower than the space | interval between the vertical materials of another location, and as shown in FIG. When the space between the front side edges of the left and right side panels 2 and 3 is closed, as shown in FIGS. 2 to 4, it protrudes from the vertical front side edges of the left and right side panels 2 and 3 at a height corresponding to each locking means 11. The locked portion 14 is configured to project forward between the vertical members 13a and 13b in which the distance between the left and right sides of the door panel 5 is narrowed. It is configured so that it can be held in a vertical position. The locked portion 14 is fixed by welding the parallel shaft portion of a round steel rod 15 bent into a U shape to the inside of the vertical member 13 of the left and right side panels 2 and 3 in the horizontal direction. 3 and a U-shaped portion 15a protruding from the vertical front edge.

  The locking means 11 includes a lock pin 16 and a handle portion 17 attached to the lock pin 16. The lock pin 16 is made of a steel round bar material, and a pair of left and right guide members 18 and 19 attached to the outside of the door panel 5 allows horizontal movement in the direction of the pin axis and rotation around the pin axis. It is supported horizontally and horizontally as possible. The pair of left and right guide members 18 and 19 are fixed vertically by welding to the outside of the two upper and lower horizontal members 12 between the vertical members 13b and 13c and between the vertical members 13d and 13e of the door panel 5, and at the upper end portion. Lock pin support portions 18a and 19a projecting in a substantially semicircular shape are provided, and the lock pin 16 is supported horizontally and horizontally between the lock pin support portions 18a and 19a and the vertical members 13a to 13e of the door panel 5. Yes. The guide members 18 and 19 are integrally formed by bending one steel round bar together with the cross member 20 connecting the upper ends thereof.

  The handle portion 17 is formed by bending one steel round bar into a U-shape, and the free end portions of the left and right vertical axis portions 17a and 17b are formed by the pair of left and right guide members 18 and 19, respectively. It is fixed by welding so as to overlap the inside of the lock pin 16 at an intermediate position. Accordingly, the lock 17 is moved in and out of the pin axis direction by gripping the handle 17 only within a range in which the handle 17 can move horizontally between the pair of left and right guide members 18 and 19. Can be made. On the other hand, the lock pin 16 is located approximately halfway from the peripheral surface of the lock pin 16 as shown in FIGS. Protrusions 21 protruding in a circular shape are integrally formed by press molding.

  The positional relationship between the handle portion 17 and the pair of left and right guide members 18 and 19 and the vertical members 13c and 13d on the door panel 5 side, and the pair of engaging portions 22 and 23 and the door constituting the handle portion hanging posture holding means. The positional relationship with the vertical members 13b and 13d on the panel 5 side is set so that the functions described below can be expected.

  That is, the lock pin 16 rotates the handle portion 17 upward and forward with the lock pin 16 as an axis, and the free end portions of both longitudinal axis portions 17a and 17b do not interfere with the vertical members 13c and 13d on the door panel 5 side. In this state, the handle 17 can be grasped and the lock pin 16 can be moved in and out of the range described above in the axial direction of the pin. Accordingly, the door panel 5 closes the front ends of the left and right side panels 2 and 3 as shown in FIG. 1, and the left and right side panels 2 and 3 on the side of the locked portion 14 are connected to the door panel 5 as shown in FIGS. In the state where the vertical members 13a and 13b on the left and right sides of the left and right sides protrude forward, the lock pin 16 is inserted through the handle portion 17, and the outer vertical axis portion 17a of the handle portion 17 is the lock pin of the outer guide member 18. By moving forward to an advance position adjacent to the inside of the support portion 18a, the tip end portion 16a can be inserted into the locked portion 14 (inside the U-shaped portion 15a), and the door panel 5 can be locked in the closed position. it can. When the handle portion 17 is rotated together with the lock pin 16 in the illustrated hanging posture in this state, the protrusion 21 enters the inside of the vertical member 13b on the door panel 5 side, and enters the inner longitudinal axis portion 17b of the handle portion 17 ( The free end portion) slides into and enters the outside of the vertical member 13d on the door panel 5 side. That is, the handle portion 17 that is in the suspended position, and the lock pin 16 that has reached the advanced position (lock position) has the projection 21 and the inner longitudinal axis portion 17b (the free end portion) of the handle portion 17 at the door panel. It enters between the two vertical members 13b and 13d on the 5 side and is positioned so that it cannot move to the left or right. Therefore, in this embodiment, the projection 21 and the inner longitudinal axis portion 17b (its free end portion) of the handle portion 17 constitute two engaging portions 22 and 23 for positioning the lock pin 16 at the advanced position.

  As shown in FIG. 3, since the vertical members 13b and 13d are round bars having a cylindrical peripheral surface, the interval between the vertical members 13b and 13d is the interval on the line connecting the axes of the two in a transverse plan view. Is the narrowest, and gradually increases in any direction from the inside to the outside. As shown in FIGS. 7 and 8, the protrusion 21 (engaging portion 22) has a plate shape along the axial direction of the lock pin 16 and has a substantially semicircular plate surface. The amount of protrusion from the lock pin 16 is such that when the protrusion 21 is in a direction that protrudes horizontally from the lock pin 16 to the door panel 5 as shown in the drawing, the protrusion 21 has two vertical members 13b on the door panel 5 side. , 13d is pressed against the vertical member 13b in the vicinity of the narrowest interval, as shown in FIGS. 2, 3, and 9A, the handle portion 17 is in a suspended position and the projection 21 (engaging portion) 22) is inclined obliquely upward on the door panel 5 side from the lock pin 16, the projection 21 is located outside the narrowest space between the two vertical members 13b and 13d on the door panel 5 side. Pressure contact with the vertical member 13b at a place where the interval of It is set to be in it.

  Accordingly, the lock pin 16 is moved to the advanced position as described above, and the handle portion 17 is rotated to the hanging position in a state where the lock pin 16 is engaged with the locked portion 14 on the side panels 2 and 3 side. When the handle portion 17 is rotated upward from the position positioned at the advanced position, the projection 21 has the narrowest distance between the two vertical members 13b and 13d on the door panel 5 side with the upward rotation. At this time, the projection 21 (engagement portion 22) and the inner vertical portion of the handle portion 17 are equivalent to the virtual overlap margin a in a plan view between the projection 21 and the longitudinal member 13b shown in FIG. 8B. The shaft portion 17b (engaging portion 23) spreads the two vertical members 13b and 13d on the door panel 5 side. As shown in FIGS. 7 and 8A, the amount of spreading (resistance force) at this time becomes maximum when the projection 21 is in a horizontal direction orthogonal to the vertical member 13b, and the handle portion 17 further rotates upward. Then, as the projection 21 is inclined downward, the amount of expansion (resistance force) decreases, and when the projection 21 is separated from the vertical member 13b, the handle portion 17 becomes free.

  As is clear from the above description, when the lock pin 16 is moved to the advanced position and engaged with the locked portion 14 on the side panels 2 and 3, the handle portion 17 is rotated toward the hanging posture. Until the projection 21 (engagement portion 22) enters the inside of the vertical member 13b on the door panel 5 side, the handle portion 17 can be rotated with little resistance, and the projection 21 (engagement portion 22) is on the door panel 5 side. The rotational resistance applied to the handle portion 17 gradually increased as it entered the inside of the vertical member 13b. As shown in FIGS. 7 and 8, the rotational resistance became a horizontal orientation in which the protrusion 21 was orthogonal to the vertical member 13b. When this point becomes the neutral point (dead point), the rotational resistance gradually decreases with the rotation of the handle portion 17, and when the drooping posture shown in FIGS. 2 to 4 and FIG. 9A is reached, the rotational resistance Is minimized. In other words, when the handle portion 17 in the hanging posture rotates upward, the rotational resistance gradually increases. Therefore, unless the operating force sufficient to overcome the rotational resistance is applied to the handle portion 17, the handle portion 17 vibrates, When the pallet is turned upside down, it does not rotate in the standing direction due to the gravity acting on the handle portion 17, and the handle portion 17 automatically takes the suspended posture in which the lock pin 16 is positioned at the advanced position (lock position). Retained. Therefore, in this embodiment, the protrusion 21 (engagement portion 22) and the vertical member 13b on the door panel 5 side constitute a handle portion hanging posture holding means that maximizes the rotational resistance of the handle portion 17 immediately before the hanging posture. It has been done.

  When releasing the lock at the closed position of the door panel 5 by the locking means 11, the handle portion 17 in the hanging posture is forcibly rotated upward against the rotational resistance gradually increasing to the neutral point, Even if the handle portion 17 is moved backward in the axial direction of the lock pin 16, the free end portions of the longitudinal axis portions 17a and 17b are raised up to an angle that does not interfere with the vertical members 13c and 13d on the door panel 5 side. As a result, the positioning at the advanced position with respect to the lock pin 16 due to the both vertical axis portions 17a, 17b of the handle portion 17 entering between the outer guide member 18 on the door panel 5 side and the vertical member 13d is released. In this state, the lock pin 16 is moved backward together with the handle portion 17, and as shown in FIGS. 5 and 6, the distal end portion 16 a of the lock pin 16 is detached from the locked portion 14 on the side panel 2, 3 side, and the door The lock at the closed position of the panel 5 can be released. That is, the door panel 5 can be freely opened and closed.

  As shown in FIGS. 5 and 6, the lock pin 16 is moved backward by the contact of the inner longitudinal axis portion 17b of the handle portion 17 with the lock pin support portion 19a of the inner guide member 19 on the door panel 5 side. In this state, the handle portion 17 is rotated downward together with the lock pin 16 to the hanging position so that both longitudinal axis portions 17a and 17b of the handle portion 17 are connected to the inner guide member 19 and the vertical member 13c on the door panel 5 side. The lock pin 16 is positioned in the retracted position (lock release position). In this state, the protrusion 21 (engagement portion 22) on the lock pin 16 side is not functioning.

  When the protrusion 21 as the engaging portion 22 is provided on the lock pin 16 at the position described in the above embodiment, the protrusion 21 and the lock pin support portion 18a in the outer guide member 18 on the door panel 5 side are as follows. It can comprise so that the function of may be exhibited. That is, the lock pin 16 provided with the protrusion 21 is formed between the vertical members 13a to 13e on the door panel 5 side inside the lock pin support portions 18a and 19a of the guide members 18 and 19 on the door panel 5 side. As shown in FIG. 9, since the lock pin support portions 18a and 19a are formed by projecting a steel round bar into a substantially semicircular shape, as shown in FIG. The upper and lower corners of the vertical sides adjacent to the vertical members 13a to 13e are substantially semicircular in a square shape protruding in the vertical direction. Accordingly, the handle portion 17 has an intermediate constant angle θ between the hanging posture shown in FIG. 9A and the posture standing directly above shown in FIG. 9C, and the free end portions of both longitudinal axis portions 18 and 19 are the door panel. As shown in FIG. 9B, only when the lock pin 16 is moved backward by the handle portion 17 as shown in FIG. Is connected to the inner guide member 19 via the lower angular protrusion space portion of the vertical side in the inner passage of the lock pin support portion 18a of the outer guide member 18 on the door panel 5 side. It can be configured to be able to pass through.

  In other words, when the lock pin 16 of the locking means 11 is unlocked at the closed position of the door panel 5, only when the handle portion 17 in the hanging posture is rotated upward to a certain angle θ shown in FIG. 9B. The lock pin 16 can be moved from the advanced position to the retracted position by the handle portion 17 to release the lock, and the handle portion 17 is in a range up to a posture in which the handle portion 17 stands right above the predetermined angle θ. 9C, the protrusion 21 interferes with the lock pin support portion 18a of the outer guide member 18 to prevent the lock pin 16 from moving backward from the advanced position. In the illustrated embodiment, when the handle portion 17 in the suspended posture is rotated upward to a certain angle θ shown in FIG. 9B as shown in FIG. 9B, the lock pin 16 is further supported by the handle portion 17 to the lock pin. The projection 21 can be moved and moved through the lock pin support portion 18a only when it is lifted upward within the range of play in the inner space of the portions 18a and 19a. Further, FIG. 9C shows that the protrusion 21 is locked even if the lock pin 16 is lifted further up within the range of play in the inner space of the lock pin support portions 18a and 19a by the handle portion 17 rotated to the position where it stands upright. It shows that the backward movement of the lock pin 16 can be prevented by interfering with the pin support portion 18a.

  As is apparent from FIG. 9C, when the inner bag is set on this box-type pallet and used for transporting and storing roses, the contents can be taken out from the inner bag. Therefore, when the pallet is turned upside down, the holding of the handle portion 17 in the suspended position is unexpectedly released due to contact with other objects or strong vibration, and the handle portion 17 is viewed from the pallet side by gravity. Thus, even when the arm is pivoted from the suspended posture to the posture standing right above and is suspended from the lock pin 16 on the ground, the lock pin 16 is interfered with by the interference between the protrusion 21 and the lock pin support portion 18a of the outer guide member 18. However, it is possible to prevent the door panel 5 from being unlocked by moving backward together with the handle portion 17.

  As a pair of engaging portions that engage with the two vertical members on the door panel 5 side and position the lock pin 16 at the advanced position, the handle portion 17 is not used, and the lock pin 16 is separated in the axial direction. In addition, two protrusions can be projected from two locations, and these two protrusions can be configured to slide into and enter any two inside or outside of the vertical members 13b to 13e on the door panel 5 side. . In this case, both of the two protrusions (engagement portions) protruding from the lock pin 16 are configured in the same manner as the protrusion 21 of the above-described embodiment, and the two protrusions (engagement portions) and these both protrusions are engaged. With the two of the vertical members 13b to 13e on the door panel 5 side, it is possible to constitute a handle portion hanging posture holding means that maximizes the rotational resistance of the handle portion 17 immediately before the hanging posture.

  In the door panel 5 shown in FIG. 10, the guide member 18 is arrange | positioned inside the vertical member 13a of the side, Between this guide member 18 and the said vertical member 13a, the to-be-latched part of the side panels 2 and 3 side is provided. The space | gap which 14 inserts is formed. In such a configuration of the door panel 5, the engaging portion 22 (projection 21) on the lock pin 16 side is the second from the side of the door panel 5 when the lock pin 16 is in the advanced position (lock position). It can be provided at a position adjacent to the inside of the longitudinal member 13b. In this configuration, the rotation resistance acting on the handle portion 17 is maximized by the protrusion 21 pressing the longitudinal member 13b outward immediately before the handle portion 17 reaches the hanging posture. In this configuration, when the lock pin 16 is moved backward from the advanced position (lock position), the protrusion 21 does not pass through the lock pin support portion 18a of the guide member 18, and as described above, the grip portion When the lock pin 16 can be moved backward from the advanced position (lock position) only when the angle 17 is at an intermediate constant angle between the hanging position and the standing position, it is indicated by a dotted line in FIG. Thus, apart from the protrusion 21, when the lock pin 16 is in the advanced position (lock position), the second protrusion 21 ′ is locked so as to be adjacent to the outside of the lock pin support portion 19 a of the inner guide member 19. 16 and when the lock pin 16 is moved backward from the advanced position (lock position) only when the handle portion 17 is at an intermediate fixed angle between the hanging position and the standing position. Second projection 21 'may be configured to move pass the locking pin support portion 19a of the inner guide member 19 to the inside.

It is a perspective view which shows the whole box-type pallet. It is a front view of the principal part which shows the one latching means in a lock action state. FIG. 3 is a transverse plan view of FIG. 2. FIG. 3 is a side view of FIG. 2. It is a front view of the principal part which shows the latching means of the state switched to the lock release state. FIG. 6 is a transverse plan view of FIG. 5. It is a vertical side view of the principal part which shows the latching means in the state which rotated the handle part to the neutral point. Fig. A is a transverse plan view of Fig. 7, and Fig. B is an enlarged view for explaining the operation of the main part. Fig. A is a longitudinal side view of the main part showing the locking means in a state where the handle part is in a suspended position, and Fig. B is a vertical side view of the main part showing the locking means in a state where the handle part is rotated to an intermediate fixed angle. FIG. C and FIG. C are vertical side views of the main part showing the locking means in a state in which the handle part is rotated to a position where it erects right above. It is a front view of the principal part explaining a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Load loading bases 2, 3 Left and right both-side panel 4 Back panel 5 Door panel 5A Door panel lower half 5B Door panel upper half 6-9 Coil hinge 11 Locking means 12 Cross members 13 and 13a-13e which comprise a panel Vertical member 14 constituting the panel Locked portion 15 U-shaped steel round bar 16 Lock pin 17 Handle portion 18, 19 Guide member 18a, 19a Lock pin support portion 21 Projection 22, 23 Engagement portion

Claims (4)

  A door panel that can be freely opened and closed and a locking means that locks the door panel in a closed state. The locking means is engaged with a locked portion that protrudes from the side panel adjacent to the door panel. A lock pin supported by the door panel, which is movable in and out of the pin length direction between the position and a retracted position where it is disengaged from the locked portion, and is capable of rotating around the pin axis. The locking means is composed of a handle portion connected to the pin, and when the handle portion is rotated together with the lock pin in a hanging position along the door panel with the lock pin in the advanced position, A pair of engaging portions for engaging the two vertical members on the panel side and positioning the lock pin at the advanced position are provided, and at least one of the pair of engaging portions and the engaging portion are provided. With the columnar peripheral surface of the vertical member on the door panel side where the Grip hanging posture holding means is composed, box-pallet door panel locking device to maximize the rotational resistance of the handle portion immediately before the lower position.   At least one of the pair of engaging portions is constituted by a substantially semicircular protrusion protruding from the lock pin, and this protrusion serves as an engaging portion constituting the handle portion hanging posture holding means. The door panel locking device for a box-type pallet according to claim 1.   The handle portion is formed by bending a bar material into a U shape, and both longitudinal axis portions thereof are fixed to a lock pin, and one of the pair of engaging portions is one of the handle portions. The other engaging portion is constituted by a substantially semicircular protrusion protruding from the lock pin, and this protrusion serves as an engaging portion constituting the handle portion hanging posture holding means. The box panel pallet door panel locking device according to claim 1. The lock pin is supported by a pair of left and right guide members attached to the outside of the door panel, and the pair of guide members protrudes so that the lock pin penetrates the inner side of the bar by bending the bar into a substantially semicircular shape. The protrusion when the lock pin is in the advanced position is positioned outside one of the pair of guide members, and the handle portion stands upright from the hanging position. 3. The box-type pallet door panel according to claim 2, wherein the projection is configured to be able to pass through and move inwardly through the lock pin support portion of the guide member only when the angle is at an intermediate constant angle with respect to the posture. Locking device.

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