JP4861957B2 - Step for lifting truck bed - Google Patents

Description

  The present invention relates to a step for raising and lowering a truck bed as a ladder used by leaning on a required part of a truck bed.

  The present invention relates to an ascending / descending step for a worker to ascend / descend to / from a loading platform for carrying out work on a loading platform of a truck or to carry a small luggage or the like from the loading platform.

  The truck bed has a tilt that can be opened and closed around it, but as the steps for getting on and off the truck bed, raising and lowering and loading and unloading the load, a moving step with a staircase structure with wheels is used. There are difficulties in location and ease of installation, and it is not suitable for mounting on a truck bed when unnecessary.

  On the other hand, in this way, a ladder dedicated to trucks that allows workers to ascend and descend the cargo bed part for carrying out work on the truck bed part or to carry small parcels etc. from the cargo bed part. Conventionally, this has not been known. Therefore, for raising and lowering at the truck bed, an ordinary ladder is used in which a pair of struts are horizontally mounted at a predetermined interval on both sides of a pair of pillars.

  However, an ordinary ladder is leaned as it is on a required part of the truck bed, for example, a roll outer plate attached to the load bed (the side roll outer plate on the left and right sides and the rear roll outer plate on the rear side). Since the ladder is easy to slide from the rolling board, other workers other than the worker who goes up and down the ladder have to hold the ladder, which is very troublesome.

Patent Document 1 listed below is an alternative to an ordinary ladder. For example, the upper end of the outer cover plate of the truck bed, the handrail attached on the upper cover plate, or the load base portion in a state where the turn outer plate is tilted down. It has been proposed that it can be self-supported safely without slipping even when leaning.
JP 2005-48381 A

  As shown in FIG. 10, the truck elevating ladder A is composed of a ladder 3 in which a pair of struts 1 are horizontally mounted on a pair of both sides 1, 1 at a required interval, and a pillar 1 on one side of the ladder 3. It comprises a handrail 4 to be attached, and a latch 6 provided on the upper side of each of the columns 1 and 1 of the ladder 3 and latched at a standing position of the loading platform 5 of the truck.

  Although not shown in the drawings, each column 1 of the ladder 3 includes a column body and an expansion / contraction member connected to the lower end portion of the column body so that the expansion / contraction can be freely adjusted. A grounding base 9 is provided at the lower end portion of the expansion / contraction member. It is pivotally attached. Anti-slip is applied to the bottom surface of the grounding base 9.

  The latching tool 6 includes a pivotable pivot plate 10 having one end pivotally attached to each column 1 of the ladder 3 and a substantially L-shaped latch body fixed to the tip of the pivot plate. 11, a latch position holding means for holding the latch body 11 at a latch position protruding horizontally forward from the column 1 when the ladder 3 is in a leaning posture with a predetermined inclination angle, and the latch body 11 It is comprised by the retraction position holding means hold | maintained at the retraction position retracted | saved to the support | pillar 1 side.

  The usage method will be described. When using the lift ladder A, when the lift R is tilted on the base end portion 37 of the lift R in a state where the lift R of the truck bed 5 is tilted, the ladder 3 is placed on the ground G. The hook body 11 of the hook 6 is hooked to the base end portion 37 of the lift R pivotally attached to the loading platform 5 while being tilted forward so as to have a predetermined inclination angle.

  Similarly, when the lift R is erected with respect to the loading platform 5 and the lifting ladder A is stood and used on the upper end portion of the handrail 38 standing on the lift R, the latch 6 is similarly latched. The tool body is hooked on the upper horizontal frame of the handrail 38.

  In this way, when the lifting ladder A is leaned against a required part of the truck bed part 5 and used, the latches 6 provided on the upper sides of the both columns 1 and 1 of the ladder 3 are used to lean the truck bed part 5. In the example of FIG. 10, the base end portion 37 of the tilting R and the upper horizontal frame of the handrail 38 are hooked and self-held, so there is no need for the operator to hold the ladder 3, and therefore the lifting ladder No extra workers are required to use A, and the lifting ladder A can be used safely.

  By the way, if the lift of the truck bed can be brought to a horizontal state when loading or unloading the load, it can be used as a work space for the worker to place the load on the lift, which is convenient when loading the entire bed. It is.

  However, in the lifting ladder for trucks disclosed in Patent Document 1, the latching tool 6 hooks a substantially L-shaped latching body 11, and the lift of the truck bed is set up vertically or from this standing state. The use was limited to a state in which it was folded 180 degrees and tilted, and when the tilt was tilted to a horizontal state, there was no place to be caught and it could not be used.

  The present invention eliminates the inconveniences of the above-mentioned conventional example, and by placing the lift of the truck bed in a horizontal state, the load on the lift is used as a work space for workers to load and when loading and unloading. Assuming that it will be used as a storage space, even if it leans up in a state where the truck bed is tilted horizontally, it can be safely held without slipping, and the ladder can be used horizontally as a support leg for the cage. In addition to supporting the tilted tilt and increasing the load-bearing strength of the tilt, it is easy and reliable to install on the truck bed, and the step can be stored in the truck bed when not in use. Another object of the present invention is to provide an excellent step for raising and lowering a truck bed.

  In order to achieve the above object, the truck bed lifting / lowering step according to the present invention is, firstly, a truck bed lifting / lowering step as a ladder that is used by leaning on a required part of the truck bed. Each strut of the ladder formed by attaching the crosspieces at appropriate intervals is provided with a tilting bracket that sandwiches the tilting end of the horizontally loaded truck carrier from above and below. It is composed of a lower fitting as a strong receiving member that is pivotally mounted in a horizontal direction with respect to the lower fitting, and an upper fitting that is attached to the lower fitting so as to be movable up and down via a connecting rod. Is.

  According to the first aspect of the present invention, as a step for raising and lowering the truck bed as a ladder used by leaning on a required place of the truck bed, the truck which is tilted horizontally by the upper metal fitting and the lower metal fitting provided on each column of the ladder. Since the ladder is attached by sandwiching the edge of the cargo bed from above and below, it can be used even when the top of the cage is used as a work space for workers to load or as a temporary storage space for loading and unloading. is there.

  Then, the ladder supports the tilted horizontally as a support leg of the tilt, and the ladder can be hung in a stable state, and the load receiving strength of the tilt can be increased. In this way, the presence of the sword clamp plays an important role as a strength stool that supports a horizontally tilted tilt, particularly with respect to the lower stool.

  In the present invention, the lower bracket is attached so as to be pivotable in the horizontal direction with respect to the support column, so that when not in use, it is between the support columns on both sides. It is housed inside and flattened as a whole, so that the projecting portion is not generated and the housing property is good. In this case, since the upper metal fitting is connected to the lower metal fitting, if only the lower metal fitting is rotated, the upper metal fitting is automatically placed in the storage position at the same time. Furthermore, if the supporting strength is given only to the lower metal fitting, it is possible to support the tilt that is tilted sufficiently horizontally.

  In addition, when sandwiching the cage between the upper bracket and the lower bracket, it is only necessary to slide the upper bracket downward until it comes into contact with the upper surface of the upper bracket. I can hold the tilt from the top and bottom.

  According to a second aspect of the present invention, the attachment mechanism is composed of an attachment portion that is fixed vertically to the support column, and a support piece that protrudes horizontally from above and below the attachment portion, and a hinge pin between the upper and lower support pieces. And a rotating mechanism that slidably penetrates the upper and lower support pieces, the horizontal mounting portion of the lower metal fitting is superimposed on the upper surface of the upper and lower support pieces, and the lower metal fitting is pivotally coupled to the support piece with a hinge pin. To do.

  According to the second aspect of the present invention, the rotation of the lower fitting is simple because the horizontal mounting portion only needs to be rotated on the support piece with the hinge pin as the central axis. In addition, the lower metal fitting is optimally supported as a strength metal fitting that supports the horizontal tilt.

  According to the third aspect of the present invention, the rotating mechanism is positioned at the use position and the storage position of the lower bracket, the support piece is provided with a locking notch, the horizontal mounting portion of the lower bracket is fixed to the hinge pin, and the horizontal mounting portion The sheet is provided with a projecting portion that can be freely inserted and retracted into the locking notch.

  According to the third aspect of the present invention, when the hinge pin is pushed up with respect to the support piece and the horizontal mounting portion of the lower metal fitting is rotated, the protruding portion is fitted into the locking notches formed at the use position and the storage position, respectively. Thus, the lower bracket can be easily rotated and moved to either the use position or the storage position.

  The present invention described in claim 4 is provided with a pinch thickness adjusting mechanism for raising and lowering the upper metal fitting along the connecting rod on the upper metal fitting, and the present invention described in claim 5 is characterized in that the pinch thickness adjusting mechanism is provided by the upper metal fitting. The gist of the present invention is that it is composed of a spring that urges the spring to be pressed down and an adjustment lever that releases the pressing force of the spring so that the upper metal fitting can be raised.

  According to the fourth and fifth aspects of the present invention, the upper metal fitting can be pushed down along the connecting rod by pressing the upper metal fitting as it is with the pressing force of the spring, and there is a gap between the upper surface of the cage and the upper metal fitting. It does not occur and it can contact the upper surface of the cage reliably and the ladder will not swing. To separate the upper bracket from the upper surface of the cage when not in use, the upper bracket is released from the spring pressure applied to the upper bracket by operating the adjustment lever against the pressing force of the spring, which is the clamping thickness adjustment mechanism. The upper metal fitting can be moved upward along the connecting rod.

  As described above, the step of raising and lowering the truck bed according to the present invention is such that the lift of the truck bed is brought down to a horizontal state, so that the upper side of the truck bed is used as a work space on which an operator is placed or when loading / unloading a load. Assuming that it will be used as a temporary storage space for the load, even if it is leaned in a state where the truck bed is tilted horizontally, it can be safely held without slipping, and the ladder has a support leg for the cage. In addition to supporting horizontally tilted tilt, the load receiving strength of the tilt can be increased, and the ease and certainty of mounting to the truck bed, the step to the truck bed when not in use It also has excellent storability.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of a step for raising and lowering a truck bed according to the present invention, and FIG. 2 is a front view of the same.

  The step for raising and lowering the truck bed according to the present invention is a step for raising and lowering the truck bed as a ladder that is used by leaning on a required part of the truck bed, and a plurality of step bars 3a are appropriately spaced between the pair of columns 1 and 1. It comprises a ladder 3 that is mounted and a tilting metal fitting that sandwiches the ends of the truck rack's racks R provided on the support columns 1 and 1 from above and below, and the tilting metal fittings are rotatable in the horizontal direction with respect to the support column 1. The lower metal fitting 8 is attached to the lower metal fitting 8 and the upper metal fitting 7 is attached to the lower metal fitting 8 so as to be movable up and down.

  The lower metal fitting 8 will be described. As shown in FIG. 3, the lower metal fitting 8 is attached to the support column 1 through a mounting mechanism having a rotating mechanism so as to be rotatable in the horizontal direction. As shown in FIGS. 5 and 6, the horizontal mounting pieces 15 to the lower metal fitting 8 are horizontally projected from the upper and lower sides of the U-shaped joining pieces 13 fixed to the left and right side surfaces of the support column 1 by the rivets 14.

  A hinge pin 16 as a rotating mechanism is slidably passed between the upper and lower horizontal mounting pieces 15. The hinge pin 16 was formed longer than the distance between the upper and lower horizontal mounting pieces 15, and a coil spring 17 was wound around the hinge pin 16 to urge the hinge pin 16 to be pressed downward. In this way, the joining piece 13 has a vertical width sufficient to ensure the vertical length of the hinge pin 16 and can be configured as a receiving bracket having sufficient strength to be fixed by the rivet 14.

  A locking notch 18a in which a locking projection provided on the lower metal fitting 8 (described later) is inserted into the upper horizontal mounting piece 15 at a 90-degree positional relationship at a use position, and a locking notch 18b to be inserted at a storage position Is formed in a U-shape.

  The lower metal fitting 8 has a side L-shaped main body as a holding piece 19, the long side portion of the L-shape is formed in a U-shaped cross section, and a contact plate 20 for mounting on the inside of the U-shape is mounted.

  The L-shaped short side portion closes the top surface to form horizontal mounting portions 21 and 21 on the top and bottom. The horizontal mounting portions 21 and 21 are overlapped on the top surfaces of the horizontal mounting pieces 15 and 15 and rotated by the hinge pin 16. Join as possible. Thereby, the lower metal fitting 8 is attached to the support column 1 via the attachment member 12 so as to be rotatable in the horizontal direction.

  From the lower surface of the upper horizontal mounting portion 21, a locking projection 22 that fits into the locking notches 18 a and 18 b is provided in advance. As the locking projection 22, for example, a screw head or the like can be used.

  Next, the upper metal fitting 7 will be described. The main body is formed in a downward U-shape to form a presser piece 24, a contact plate 23 for the cage is mounted on the inner side of the U-shaped main body, and the base is formed in a cross-sectionally R-shape as shown in FIG. 8 and a connecting portion 25.

  Then, the upper and lower surfaces of the connecting portion 25 having a rectangular cross section and the upper and lower short sides of the lower metal fitting 8 are passed through, for example, a connecting rod 26 made of a square bar is inserted. As a result, the upper metal part 7 is coupled to the lower metal part 8 via the connecting rod 26. If the connecting rod 26 is a square bar, the connecting rod has a rectangular cross section and has a corner, and a stable engagement is achieved by using a through hole 28a through which a connecting rod 26 of an adjustment lever 28 described later is inserted as a square hole. It is important that the side surface of the connecting rod 26 is a continuous straight line. By providing a continuous straight line without providing a serrated blade such as a ratchet blade, it is possible to select a latching point along the continuous straight side on an uninterrupted floor.

  The upper end of the connecting rod 26 protrudes above the upper surface of the connecting portion 25, and a stopper 27 is provided at this protruding portion to prevent the connecting rod 26 from falling off. Further, an adjustment lever 28 serving as a sandwiching thickness adjusting mechanism for adjusting the distance from the lower metal fitting 8 by raising and lowering the upper metal fitting 7 is disposed inside the connecting portion 25.

  The adjustment lever 28 is pivotally supported at one end, and has a through hole 28a through which the connecting rod 26 is inserted. The through hole 28a is formed as a long hole that is slightly larger than the length of the connecting rod 26 in the horizontal width direction in FIG.

  Further, the adjustment lever 28 is pressed downward by a spring 29 provided by a winding spring disposed inside the connecting portion 25 so that the opposite side to the shaft support portion is lowered, and one edge of the through hole 28a is connected to the connecting rod 26 continuously. Abutting on the straight side surface, the upper metal fitting 7 is prevented from moving upward.

  In the ladder 3 provided with the upper bracket 7 and the lower bracket 8 for sandwiching the end of the lift R of the truck bed from above and below on the pillars 1 and 1, the pillar 1 is nested with respect to the hollow pillar-shaped pillar body 1a. The lower telescopic rod 30a to be slid and the upper telescopic rod 31a to be slidably fitted are provided with a double-stretchable portion at the upper and lower portions (lower telescopic portion 30, upper telescopic portion 31), As shown in FIGS. 1 and 2, the upper metal fitting 7 and the lower metal fitting 8 are provided on the upper telescopic rod 31a.

  Next, usage and operation will be described. The truck driver has the step of raising and lowering the truck bed according to the present invention during operation. However, when the truck driver is not in use, the upper and lower metal fittings 7 and 8 are folded.

  The folded state is a state of a tilting metal fitting provided on the right column 1 in FIG. 2, and the locking protrusion 22 protruding from the lower surface of the horizontal attachment portion 21 of the lower metal fitting 8 is the horizontal of the attachment member 12. The fitting piece 15 is fitted in a locking notch 18b that is fitted in the storage position.

  The locking projection 22 does not come out of the locking notch 18b when the horizontal mounting portion 21 is pressed against the lower horizontal mounting piece 15 by the hinge pin 16 pressed downward by the pressing force of the coil spring 17. It is held in the storage position.

  In this state, the lower metal fitting 8 is housed inside the left and right columns 1 and 1 and does not protrude forward from the column 1 in FIG.

  Further, the upper metal fitting 7 coupled to the lower metal fitting 8 via the connecting rod 26 is also integrated with the lower metal fitting 8 and is housed between the left and right support columns 1 and 1 in the same manner as the lower metal fitting 8. In this state, the entire clamp is folded inward in the width direction of the ladder, so there is no projecting part from the ladder, storage space can be kept to the minimum necessary, and stacking in a stable state Is also possible.

  In this way, the upper metal fitting 7 of the tilting clip fixed to the storage position with respect to the support column 1 is set at a position where it is raised to the uppermost end of the connecting rod 26, and the distance from the lower metal fitting 8 is maximized. deep.

  In this state, as shown in FIG. 9A, the adjustment lever 28 is pushed downward by the spring 29, and the edge of the through hole 28 a formed in the adjustment lever 28 comes into contact with the continuous linear portion of the connecting rod 26. The upper metal fitting 7 is held in this raised position.

  On the other hand, the lower telescopic rod 30a and the upper telescopic rod 31a are housed in the column main body 1a, and the entire column 1 is contracted as shown in FIGS.

  In order to attach such a ladder to the tilt R of the truck bed that has been tilted horizontally, the stretch lengths of the upper telescopic rod 31a and the lower telescopic rod 30a are adjusted, and the tilt pinch is adjusted to the height of the tilt R. In this case, as shown in FIG. 8, the upper telescopic rod 31a is first stretched to adjust the height, and when the height cannot be adjusted only by the upper telescopic rod 31a, the lower telescopic rod 30a is stepped on the foot plate 3a of the lower telescopic rod 30a. 30a is extended downward.

  In this manner, with the gap between the upper metal part 7 and the lower metal part 8 being maximized, the ridge R is inserted between the upper metal part 7 and the lower metal part 8 and sandwiched.

  In this case, first, when the hinge pin 16 is pushed up against the pressing force of the coil spring 17 provided on the lower metal fitting 8, the locking protrusion 22 inserted into the locking notch 18b inserted at the storage position is this engagement. The horizontal mounting portion 21 of the lower bracket 8 is released from the notch 18b and the horizontal mounting piece 15 of the mounting member 12 is unlocked, and the lower bracket 8 can be rotated 90 degrees to the front of the column 1 (see FIG. 1).

  If the hinge pin 16 is pushed down again at this position, the locking projection 22 is inserted into the locking notch 18a that is inserted at the use position formed on the horizontal mounting piece 15, and the lower metal fitting 8 can be held at the use position. As a result, it is possible to avoid a dangerous state such as the accidental pinch rotating unexpectedly during use.

  As the lower bracket 8 is rotated, the upper bracket 7 coupled by the connecting rod 26 is also rotated integrally, and the upper bracket 8 and the lower bracket 7 are both projected in front of the column 1, and the lower bracket 7 There is an abutment plate 20 on the upper surface, and abuts on the lower surface of R.

  Next, the upper metal member 7 is pushed down by hand with the upper surface of the contact plate 20 placed on the lower surface of the R in this way. In this case, since the upper metal part 7 is biased downward by the elasticity of the spring 29, it does not move upward as it is, but it moves only by being pushed downward.

  The upward movement of the upper metal member 7 is prevented by the engagement of the adjusting lever 28 with respect to the connecting rod 26 as shown in FIGS. 3 and 9A. The upper end of the connecting rod 26 protrudes above the upper surface of the connecting portion 25, and a stopper 27 is provided at this protruding portion to prevent the connecting rod 26 from falling off. Further, an adjustment lever 28 serving as a sandwiching thickness adjusting mechanism for adjusting the distance from the lower metal fitting 8 by raising and lowering the upper metal fitting 7 is disposed inside the connecting portion 25.

  The adjustment lever 28 is a flat plate and has a through hole 28a through which the connecting rod 26 is inserted. The through hole 28a is formed as a long hole that is slightly larger than the length of the connecting rod 26 in the horizontal width direction in FIG.

  The adjustment lever 28 is pressed downward by a spring 29 disposed inside the connecting portion 25, and one edge of the through hole 28 a abuts the connecting rod 26 to prevent the upper metal member 7 from moving upward. is doing. One edge of the through hole 28a abuts on the connecting rod 26, which is different from the case where a blade such as a ratchet is provided, and the connecting rod can be made without any interruption along the 26 continuous straight sides. , Not limited to pitch.

  Therefore, if the abutting plate 23 on the lower surface of the upper bracket 7 is pushed down along the connecting rod 26 until it abuts on the upper surface of the ramp R, there is no gap between the upper bracket 7 and the lower bracket 8 without causing a gap. It is possible to pinch the heel R exactly with, and the ridge R can be fixed to the heel clip. Since the operation of sandwiching the tilt R can be performed by pushing down the upper metal fitting 7, the workability is better than when the lower metal fitting 8 is pushed up, and the contact position can be ascertained reliably.

  Next, the mounting angle of the ladder 3 is adjusted so that the ladder 3 does not float off the ground, and the ladder 3 is used after ensuring safety. At this time, since the upper metal fitting 7 and the lower metal fitting 8 are sandwiched between the upper metal fitting 7 and the lower metal fitting 8 as described above, the ladder 3 can be operated in a stable state without shaking within the gap during use.

  Furthermore, since the lower metal fitting 7 that supports the tilt R at the lower side is supported by the mounting member 12 fixed to the column 1, the strength can be secured even when working on the tilt R.

  To remove and fold the ladder 3 after use, the reverse operation is performed. First, if the adjustment lever 28 attached to the upper metal member 7 is pushed up against the elasticity of the spring 29, the connection of the spring 29 is performed. Since the urging force of the flange 26 is released, the upper metal member 7 is pushed up along the connecting rod 26 in this state and separated from the lift R.

  In this way, when the upper metal part 7 is separated from the cage R, the jaw clamp can be removed from the cage R. Thereafter, when the lower metal fitting 8 is pushed up against the elasticity of the coil spring 17, the engagement protrusion 22 is released from the engagement notch 18a, so that the coupling between the lower metal fitting 8 and the mounting member 12 is released. . Therefore, if the lower metal fitting 8 is rotated inward between the support columns 1 and 1, it can be stored in the storage position.

It is a side view showing one embodiment of the step for raising and lowering the truck bed of the present invention. It is a front view showing one embodiment of the step for raising and lowering the truck bed of the present invention. FIG. 3 is a partially cutaway side view of a main part in a state in which an upper metal fitting and a lower metal fitting are set to show an embodiment of the truck bed lifting / lowering step of the present invention. It is a top view of the lower metal fitting and attachment member which show one embodiment of the step for raising / lowering the truck bed of the present invention. It is a side view of an attachment member. It is a top view of an attachment member. It is a side view of the part of an upper metal fitting and a connecting rod. It is a side view of the state where a ladder was extended. It is a vertical side view which shows operation | movement of an adjustment lever. It is a whole perspective view which shows the conventional raising / lowering ladder for trucks.

Explanation of symbols

A lifting ladder R tilt G ground 1 strut 1a strut body 2 straddle 3 ladder 3a treadle 4 handrail 5 loading platform 6 hanging bracket 7 upper bracket 8 lower bracket 9 grounding base 10 rotating plate 11 hanging bracket body 12 mounting member 13 Joining piece 14 Rivet 15 Horizontal mounting piece 16 Hinge pin 17 Coil spring 18a, 18b Locking notch 19 Pressing piece 20 Abutting plate 21 Horizontal mounting part 22 Locking protrusion 23 Abutting plate 24 Pressing piece 25 Connecting part 26 Connecting rod 27 Stopper 28 Adjusting lever 28a Through hole 29 Spring 30 Lower telescopic part 30a Lower telescopic collar 31 Upper telescopic part 31a Upper telescopic collar 37 Base end part 38 Handrail

Claims (5)

  A step for raising and lowering a truck bed as a ladder that is used by leaning on a required part of the truck bed. A tilting clamp is provided to sandwich the tilting end from above and below, and the tilting clamp is pivotally mounted in a horizontal direction with respect to the column via an attachment mechanism having a rotation mechanism, and serves as a strong receiving member. A step for raising and lowering a truck bed characterized by comprising a lower metal fitting and an upper metal fitting attached to the lower metal via a connecting rod so as to be raised and lowered.   The mounting mechanism is composed of a mounting portion that is vertically fixed to the support column and a support piece that protrudes horizontally from the top and bottom of the mounting portion, and a hinge pin is slidably passed through between the top and bottom support pieces. The step for raising and lowering a truck bed according to claim 1, further comprising a rotation mechanism, wherein a horizontal mounting portion of the lower metal fitting is overlapped on the upper surfaces of the upper and lower support pieces, and the lower metal fitting is rotatably coupled to the support piece with a hinge pin.   The rotating mechanism is located at the use position and the storage position of the lower bracket, and is provided with a locking notch in the support piece, the horizontal mounting portion of the lower bracket is fixed to the hinge pin, and the locking notch is formed at the lower portion of the horizontal mounting portion. The step for raising and lowering the truck bed according to claim 1 or 2, wherein a projecting portion is provided to be freely inserted and retracted.   The step for raising and lowering the truck bed according to any one of claims 1 to 3, wherein a clip thickness adjusting mechanism for raising and lowering the upper metal fitting along the connecting rod is provided on the upper metal fitting.   5. The truck bed lifting / lowering mechanism according to claim 4, wherein the pinch thickness adjusting mechanism includes a spring that urges the upper metal fitting to be pushed down, and an adjustment lever that releases the pressing force of the spring so that the upper metal fitting can be raised. For step.

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