JP2008285815A - Step for loading space of truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a step for a loading space of a truck, which enables a gate of the loading space of the truck to be safely self-supported with no slip, even if the gate is set in state of being horizontally brought down, which can increase the load bearing strength of the gate by making the horizontally-brought-down gate supported by a ladder serving as a supporting leg for the gate, and which is excellent in the property of storage of the step in the loading space of the truck in nonuse. <P>SOLUTION: This step for the ascent to/the descent from the loading space of the truck serves as the ladder which is used by being set in a required place in the loading space of the truck. Upper and lower fittings 7 and 8, which sandwich a round end of the horizontally-brought-down gate of the loading space of the truck from above and below, are provided for supports 1 and 1 of the ladder 3 in which rungs 3a are mounted at proper intervals on the pair of supports 1 and 1 on both sides, respectively. An upper or lower holding piece 44 or 61, which can be freely rotated so that either or both of the upper and lower fittings 7 and 8 can be folded along the supports 1 and 1, is or are journaled on the supports 1 and 1. A rotation stopper 54 or 55 journaled on the supports 1 and 1 can be engaged with the upper or lower holding piece 44 or 61. <P>COPYRIGHT: (C)2009,JPO&INPIT

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. 14, the truck lifting ladder A includes a ladder 3 in which a pair of struts 1 are horizontally mounted on both sides of a pair of struts 1, 1 and a strut 1 on one side of the ladder 3. It is composed of a handrail 4 to be attached and a latch 6 provided on the upper side of each of the struts 1 and 1 of the ladder 3 and hooked 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. 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.

  As shown in FIG. 15, the rotation plate 10 is formed in a parallelogram shape, and one end of the latch 6 is pivotally attached to the outer surface of the support column 1 by a pivot 116, A substantially U-shaped notch groove 117 is formed in the projecting piece 10a projecting on the upper side of the side, and this notch groove 117 is formed on the outer surface of the support column 1 when the latching tool body 11 is in the latching position. It becomes possible to engage with the butterfly bolt 118 attached to the board 119 fixed to the board.

  Thus, by tightening the butterfly bolt 118 in a state where the notch groove 117 is engaged with the butterfly bolt 118, the latch body 11 is held at the latching position protruding horizontally from the support column 1. The cutout groove 117 and the butterfly bolt 118 constitute the latching position holding means 112.

  Further, the rotary plate 10 is formed with a substantially U-shaped notch groove 120 on the lower side portion on the free end side, and this notch groove 120 is formed on the same substrate 119 when the latch body 11 is in the retracted position. It becomes possible to engage with butterfly bolts 121 attached to other locations. Thus, by tightening the butterfly bolt 121 in a state where the notch groove 120 is engaged with the butterfly bolt 121, the hook body 11 is held at the retracted position retracted to the column 1 side. The cutout groove 120 and the butterfly bolt 21 constitute a retracted position holding means 113.

  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. 14, that is, 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 receiving strength of the tilt, it is also necessary to provide a step for raising and lowering the truck bed that excels in the ability to store the step in the truck bed when not in use. Objective.

  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. An upper bracket and a lower bracket that sandwich the tilted end of the horizontally loaded truck bed from above and below are provided on each column of a ladder that has a cross mounted at appropriate intervals, and either or both of these upper and lower brackets are attached. A pivotable pressing piece is pivotally attached to the pole so that it can be folded along the pole, and a rotating stopper pivotally attached to the pole can be engaged with the pivotable holding piece. The upper metal fitting is composed of a rotatable upper pressing piece and a rotation stopper. Third, the lower metal fitting is composed of a rotatable lower pressing piece and a rotation stopper. It 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 addition, either or both of these upper and lower brackets are pivotally attached to the column so that they can be folded along the column. This can be done quickly and easily. Moreover, after pinching, the rotation stopper can be engaged and the state can be fixed.

  According to the second aspect of the present invention, the upper holding piece of the upper metal fitting can be rotated so as to sandwich the tilted end of the truck bed that has been tilted horizontally. The lower pressing piece can be turned and sandwiched.

  According to a fourth aspect of the present invention, the upper pressing piece and the lower pressing piece have a contact plate that is pivotably attached to the support piece, and a non-slip rubber is disposed on the surface of the contact plate. This is the gist.

  According to the fourth aspect of the present invention, the upper presser piece and the lower presser piece are not a single plate, but have an abutment plate that is pivotably attached to the support piece. The change can cope with the inclination and unevenness of the contact portion, and flexible response is possible. Further, by providing a non-slip rubber on the surface of the contact plate, the frictional force increases, and it is difficult to slip and scratch.

  According to the fifth aspect of the present invention, the lower metal fitting is provided in the holder portion that slides on the outer side of the support column, and the bolt that penetrates and engages with the long hole formed in the length direction of the support column is provided in the holder unit. The gist of the present invention is that a locking means by the ratchet mechanism is provided between the support column and the holder portion.

  According to the fifth aspect of the present invention, the lower metal fitting can be slid along the support by the length of the long hole, and can be fixed by the locking means by the ratchet mechanism. As a result, the pivotable pressing piece that can be folded along the column of the lower bracket can be moved horizontally until it comes into contact with the lower side of the tilt of the truck bed that has been tilted horizontally. Can be fixed with a mechanism.

  The gist of the present invention described in claim 6 is that a locking piece projecting downward is provided below the lower metal fitting.

  According to the sixth aspect of the present invention, the ladder can be fixed to the truck bed by using the locking piece, and the ladder can be attached to the truck bed, and can be used except when the tilt of the truck bed is tilted horizontally. To. That is, the ladder can be fixed to the truck bed by inserting the locking piece into the opening of the gap with the side of the truck bed when the tilt is tilted.

  In addition, even in a state where the tilting is standing vertically, the ladder can be fixed to the truck bed by hooking the locking piece on the tilting upper end.

  The gist of the present invention described in claim 7 is that the support column has an expansion / contraction part that slidably fits the expansion / contraction hook in the upper or lower part or both with respect to the support column main body.

  According to the seventh aspect of the present invention, the support column can be adjusted to the tilting position by extending the support column itself by grounding the lower end of the support column first by using the lower or upper part as an expansion / contraction part. On the contrary, it is also possible to ground the strut lower end by extending the strut itself after the end is sandwiched and the end is sandwiched.

  According to the eighth aspect of the present invention, the support column has at least an expansion / contraction portion that slidably fits the expansion / contraction rod with respect to the column main body, and the gripping mechanism is provided in the middle of the expansion / contraction rod of the upper portion. The gist is not provided above the gripping mechanism of the upper telescoping rod, and the gist is that the upper part from the gripping mechanism is configured as a clue part during lifting and lowering.

  According to the eighth aspect of the present invention, there is no need to provide a handrail as in the conventional example, and the upper part of the column is used as a clue part when moving up and down, so that there is no need for a handrail. Can be moved up and down.

  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 the tilted horizontal tilt, the load receiving strength of the tilt can be increased, and in addition, the step can be stored in a truck bed when not in use.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing a first 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 to be attached, and an upper metal part 7 and a lower metal part 8 for sandwiching an end of a lift R of a truck bed provided on the columns 1 and 1 from above and below.

  As shown in FIGS. 3 and 4, the upper metal part 7 includes a rotatable upper pressing piece 44 and a rotation stopper 54, and the lower metal part 8 includes a rotatable lower pressing piece 61 and a rotation stopper 55. .

  The details of the upper metal fitting 7 will be described below. The upper pressing piece 44 is supported downward by the long side portion of the L-shaped rotary arm 45 whose corner is supported by a bolt 28 or a rivet. Engagement step notches 45a were formed at the side corners. The opposite side of the engagement step notch 45a at the short side end of the rotating arm 45 has a rounded corner as a corner 45b for pushing up a horizontal locking piece 54b of the rotation stopper 54 described later.

  Further, the upper pressing piece 44 is overlapped with the left and right flange portions of the supporting piece 44a with respect to the U-shaped supporting piece 44a located above when the upper pressing piece 44 protrudes horizontally. A contact plate 44b having a U-shaped cross section that is pivotally mounted with a bolt 28 or a rivet so as to be swingable. A rubber non-slip rubber 29 is disposed on the lower contact surface of the contact plate 44b. The L-shaped rotary arm 45 rivets the support piece 44a. Two short sides of the rotating arm 45 are also present in parallel to the left and right side surfaces of the support column 1, and are also present in the shadow portion of the support column 1 in FIG.

  The rotation stopper 54 is a horizontal locking piece formed below the projecting piece 54c formed by axially attaching the center of the left and right flange portions of the pushing piece 54a with a finger having a U-shaped cross section with a bolt 28 and projecting the center of the flange portion. 54 b is integrally formed, and the tip of the horizontal locking piece 54 b is engaged with the engagement step notch 45 a of the rotating arm 45. Corresponding to the short sides of the rotating arm 45 being parallel on the left and right, the protruding piece 54c and the horizontal locking piece 54b are also formed as a pair on the left and right.

  The torsion spring 53 (the center of the coil) that holds the engagement state between the distal end of the horizontal locking piece 54b and the engagement step notch 45a of the rotary arm 45 by urging the pushing piece 54a by the finger counterclockwise in FIG. The torsional load around the shaft) was disposed on the back side of the finger-pressing piece 54a.

  The details of the lower metal fitting 8 will be described. This is provided in the holder portion 57 that slides outside the support column 1, and the bolt 34 that penetrates and engages with the long hole 24 formed in the length direction of the support column 1 is provided in the holder portion 57. The distance that the holder portion 57 slides on the outside of the support column 1 is regulated by the length of the long hole 24. Note that two long holes 24 are arranged on a straight line with a space in the vertical direction.

  Furthermore, a ratchet tooth 35 is attached to the support column 1 side, a rotation part 66 integrally formed with a locking claw piece 58 for the ratchet tooth 35 is attached to the holder part 57 side, and a tip of the rotation part 66 is attached. A U-shaped finger-hanging portion 66a is formed. A torsion spring 53 that urges the rotating portion 66 to rotate counterclockwise in FIG. 3 and presses the locking claw piece 58 against the ratchet teeth 35 is provided. In the figure, reference numeral 59 denotes a shaft that pivotally supports the rotating portion 66 and the support piece 62 of the lower pressing piece 61.

  Further, a finger hooking portion 60 for pushing down the holder portion 57 is formed on the opposite side of the holder portion 57. The finger hook 60 is formed by bending a plate into a triangular shape.

  The lower pressing piece 61 that is rotatable of the lower metal fitting 8 is provided with a contact plate 63 that is pivotally supported by a bolt 28 or a rivet with respect to a support piece 62 that is pivotally supported by a shaft 59 at its center. The non-slip rubber 29 is disposed on the surface of the contact plate 63. The rubber 29 was also disposed on the side portion of the holder portion 57.

  The contact plate 63 has a U-shaped cross section having a downward flange 63a on the left and right. The downward flange 63a is pivotally attached to the flange of the support piece 62 with bolts 28 or rivets.

  The support piece 62 forms the upper end of the rear side of the abutting plate 63 as a horizontal plate 64, and the end of the horizontal plate 64 becomes an engaging portion of the engaging end edge 55 b of the rotation stopper 55.

  The rotation stopper 55 is pivotally attached to the lower side of the pressing piece 55a by a finger having a U-shaped cross section with a bolt 28 or a rivet, and forms a flange 55c perpendicular to the lower piece from the shaft attachment portion, and the lower end of the flange 55c. Becomes the engagement end edge 55b.

  The rotation stopper 55 is urged to rotate clockwise in FIG. 3, and the torsion spring 53 that maintains the engagement between the end of the horizontal plate 64 and the engagement edge 55b of the rotation stopper 55 is behind the pushing piece 55a by the finger. It arranges in.

  On the lower side of the support piece 62 of the lower metal fitting 8, a locking piece 65 made of an L-shaped metal fitting protrudes downward in the vertical direction. Rubber 29 was also attached to the peripheral surface of the locking piece 65.

  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. With the lower telescopic rod 22a that is slidably fitted and the upper telescopic rod 23a that is slidably fitted in a nested manner, there are double-stretchable portions at the upper and lower portions (the lower telescopic portion 22 and the upper telescopic portion 23), As shown in FIG. 2, the upper metal fitting 7 and the lower metal fitting 8 are provided in the upper telescopic rod 23a, and the upper fixing metal 13 for positioning and fixing the upper elastic rod 23a inserted and slid from the upper opening is provided in the column main body 1a. .

  The inside of the column main body 1a is opened by a slit along the longitudinal direction in order to expose a square hole of the lower telescopic rod 22a and a round hole of the upper telescopic rod 23a described later.

  Of the upper and lower stretchable parts, the upper stretchable part 23 will be described first. As shown in FIG. 6, a long hole 24 is provided in the vertical direction in the upper elastic bar 23 a constituting the upper elastic part 23, and round holes 25 are formed in vertical rows at appropriate intervals on the lower side.

  As shown in FIG. 8, the upper telescopic rod 23a is formed in a channel shape or a square tube shape, and becomes an inner tube with respect to the column main body 1a as an outer tube, and the corners of the four corners protrude outwardly in a rib shape, A protrusion 40 is formed. The protruding portion 40 and a portion in the vicinity thereof are formed thicker than other side wall portions.

  On the other hand, a groove 41 corresponding to the protruding portion 40 is formed on the inside of the corner portion in the column main body 1a. As a result, a gap 42 is formed between the inner surface of the column main body 1a and the outer surface of the upper expansion rod 23a in a state where the upper expansion rod 23a serving as the inner tube is inserted into the column main body 1a serving as the outer tube. Is done.

  Further, by forming the corner portion of the column main body 1a, that is, the portion corresponding to the protruding portion 40 and the vicinity thereof, the protruding portion 43 is formed outside the portion. Similarly, the protrusion 43a is formed outside the portion by forming the corner of the housing 16 covering the corner of the column main body 1a thick.

  By doing in this way, even if foreign matter such as sand or dust is sandwiched between the column main body 1a and the upper telescopic rod 23a, the foreign matter is discharged through the gap 42, so that no galling occurs, There is no possibility that the telescopic rod 23a will not slide.

  Furthermore, even if a transported object or tool hits the column main body 1a at the work site, it is difficult to deform because the protrusion 43 is formed on the outer corner which is likely to collide and is formed into a thick part. However, since the deformation does not reach the inner upper telescopic rod 23a, the upper telescopic rod 23a does not slide due to the deformation of the column main body 1a.

  When the upper elastic part 23 is pulled out or pushed into the column main body 1a, the protrusion 40 formed on the upper elastic unit 23 is fitted in the groove 41 formed on the column main body 1a. Therefore, the protrusion 40 and the groove 41 act as a guide, and the sliding direction of the upper telescopic rod 23a is restricted. Therefore, the upper telescopic rod 23a can be smoothly slid.

  Although not shown in the drawings, this configuration is the same in the lower telescopic portion 22 by the lower telescopic rod 22a that is slidably fitted to the column main body 1a, and the lower telescopic rod 22a is the upper telescopic rod 23a. It has the same protrusion 40 as that of FIG.

  As shown in FIGS. 8 and 9, the upper fixing fitting 13 is constituted by a locking member 20, a coil spring 14, and a housing 16 that accommodates these and fixes them inside the column main body 1 a.

  The locking member 20 is provided with side wall plates 20d on both side surfaces of a vertically long plate-like spring receiving portion 20e facing the inner side surface of the support column 1 so as to have a U-shaped cross section. The L-shaped lever 18 whose upper end is bent upward is formed after being bent vertically with respect to the inner side surface of the spring, and is bolted to the spring receiving portion 20e via a nut 20b. A plurality of stages of engaging protrusions 20a are provided facing outward.

  The housing 16 that accommodates the locking member 20 has a U-shaped cross section so that the side wall plate 20d of the locking member 20 is sandwiched from both outer sides, and both ends thereof are bent along the shape of the column main body 1a. In a state where the main body 1a is sandwiched from the front and rear direction, the main body 1a is fixed to the column main body 1a by the upper and lower screws 30.

  A coil spring 14 having both ends formed in a straight line and having its tip wound further is disposed between the side wall plates 20d of the locking member 20 with both ends facing upward, and one end thereof is a spring receiving portion 20e of the locking member 20. With the other end in contact with the inner side surface of the housing 16, the annular portion is supported by a bolt 32 or a shaft penetrating the housing 16 and the side wall plate 20 d in the left-right direction to lock the coil spring 14. Attach to member 20.

  As shown in FIG. 12, a round hole 25 into which the engaging protrusion 20a is inserted is formed in the upper telescopic rod 23a. The round hole 25 has a plurality of engagement protrusions 20a (two in the drawing), and thus a plurality of round protrusions 25a are provided accordingly. However, the upper telescopic part 23 may be extended only by one step with respect to the column main body 1a. The reason why a plurality of the engagement protrusions 20a are provided is to ensure the locking of the upper stretchable portion 23.

  Next, as shown in FIG. 10, in the lower telescopic portion 22, the lower telescopic rod 22a has a relatively large square hole 26 on the inner side surface with a relatively long space (for example, 1. 5 to 2 pieces) are formed in a column, and at the lower end, a leg 27 having a concavo-convex shape formed by a non-slip groove is attached to the hinge with a bolt 28 or a rivet, and as shown in FIG. A lower fixing bracket 12 for positioning and fixing the lower telescopic rod 22a inserted and slidably fitted is provided on the column main body 1a.

  The lower fixing bracket 12 includes a locking member 21, a coil spring 15, and a housing 17 that accommodates them and fixes them inside the column main body 1 a.

  The locking member 21 is provided with a side wall plate 21b on a vertically long plate-like spring receiving portion 21d facing the inner side surface of the support column 1 to form a U-shaped box shape, and the lower side of the spring receiving portion 21d is the inner side. A locking corner portion 21a that is bent at an acute angle so as to be folded back toward the corner hole 26 is formed, and then the lever is further lowered downward to form an L-shaped lever 19. A bolt hole 21c is provided on the upper part of the two side wall plates 21b.

  The length and shape of the spring receiving portion 21d are sufficient if the coil spring 15 can stably abut and can hold the side wall plate 21b, and a notch 21e is provided at the center as shown in the figure. Also good. Thereby, the sand etc. which entered in the locking member 21 can be discharged | emitted from the notch 21e outside.

  The housing 16 that accommodates the locking member 21 has a U-shaped cross section so that the side wall plate 21b of the locking member 21 is sandwiched from both outsides, and both ends thereof are bent along the shape of the column main body 1a. With the main body 1a sandwiched from the front-rear direction, the upper and lower sides are screwed to fix the main body 1a to the column main body 1a.

  The coil spring 15 is disposed between the side wall plates 21 b of the locking member 21 with both ends facing downward, the spring receiving portion side end 15 a is in contact with the spring receiving portion 21 d of the locking member 21, and the other end is the inner side surface of the housing 17. The coil spring 15 is attached to the locking member 21 with the annular portion supported by a bolt 33 or a shaft penetrating the housing 17 and the side wall plate 21b in the left-right direction.

  Note that the portion above the attachment portion of the upper metal fitting 7 and the lower metal fitting 8 of the upper telescopic rod 23a is a portion that functions as a clue portion 23b when moving up and down. The length to the upper end of the telescopic rod 23a is set to 60 cm or more, and the step bar 3a is not provided in this portion.

  Further, in the portions corresponding to the lower ends of the ratchet teeth 35 on both side surfaces of the upper telescopic rod 23a, the upper telescopic rod 23a will not enter the column main body 1a anymore and the ratchet teeth 35 will not be hidden. A protrusion 39 that contacts the upper end of the main body 1a and functions as a stopper is bolted and attached.

  In the embodiment, both the upper pressing piece 44 and the lower pressing piece 61 are pivotally attached to the support columns 1 and 1 so that both the upper metal fitting 7 and the lower metal fitting 8 can be folded along the support columns 1 and 1. Alternatively, only one of the upper metal fitting 7 and the lower metal fitting 8 may be folded with one of these being fixed.

  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. First, folding the upper bracket 7 and the lower bracket 8 will be described.

  The upper pressing piece 44 of the upper metal member 7 can be rotated by rotating the L-shaped rotary arm 45. When the upper pressing piece 44 is rotated upward, the upper pressing piece 44 becomes parallel to the support column 1 and overlaps with the support column 1 as shown in FIG. In this way, it is stored and there is no protruding part.

  When the upper pressing piece 44 is rotated approximately 75 degrees from the stored state, as shown in FIG. 3, the upper pressing piece 44 comes into contact with the upper surface of the horizontal tilting R via a rubber 29 for preventing damage to the tilting R. You can grab it.

  When the upper pressing piece 44 rotates, the pushing-up corner 45b of the short side of the rotating arm 45 hits the horizontal locking piece 54b, pushes up the rotation stopper 54 against the torsion spring 53, and further advances it. And the short side of the rotary arm 45 is offset from the horizontal locking piece 54b, and the tip of the horizontal locking piece 54b automatically engages with the engagement step notch 45a of the rotary arm 45 to It becomes a fixed state.

  In order to fold the upper pressing piece 44 again from this fixed state, the locking of the rotation stopper 54 is first released. For this purpose, if the lower side of the pushing piece 54 a by the finger is pushed against the torsion spring 53, the horizontal locking piece 54 b jumps up and the tip of the horizontal locking piece 54 b and the engagement step notch 45 a of the rotary arm 45 are engaged. Therefore, the upper pressing piece 44 can be folded by hand.

  The lower metal fitting 8 can rotate the lower pressing piece 61 by rotating the support piece 62 about the shaft 59. When the lower holding piece 8 is rotated downward, as shown in FIG. It becomes parallel and stowed, and there are no protruding parts.

  When rotated approximately 105 degrees from the stored state, it becomes parallel to the lower surface of the horizontal tilting R.

  When the lower pressing piece 61 rotates, the lower corner of the end of the support piece 62 hits the flange 55 c perpendicular to the lower piece from the shaft attachment portion of the rotation stopper 55, and resists the torsion spring 53 and the rotation stopper 55. If the lower portion of the support piece 62 is pushed outward and further advanced, the end portion of the support piece 62 automatically goes under the lower piece from the shaft attachment portion of the rotation stopper 55, and as shown in FIG. The engaging end edge 55b of the rotation stopper 55 is placed on the end of the horizontal plate 64 at the upper end of 62, and is fixed.

  In order to fold the lower pressing piece 61 again from this fixed state, first, the locking of the rotation stopper 55 is released. For this purpose, when the pushing piece 55a is pushed by a finger, the engaging edge 55b of the rotation stopper 55 is disengaged from the end of the horizontal plate 64 at the upper end of the supporting piece 62, so that the supporting piece 62 can be rotated.

  Further, when the holder portion 57 is slid on the support column 1 with the lower pressing piece 61 parallel to the lower surface of the tilting R, the lower pressing piece 61 is raised up until it comes into contact with the lower surface of the tilting tilting R. It is possible to contact the jaw R via the rubber 29 for preventing the jaw R from being damaged and to grasp the jaw R.

  When the lower pressing piece 61 moves upward, the locking claw piece 58 automatically slides on the ratchet teeth 35 and can be locked at an arbitrary position.

  On the other hand, in order to slide down the holder portion 57 with respect to the support column 1 in order to push down the lower pressing piece 61, the finger hooking portion 66a is pushed down and the rotating portion 66 resists the torsion spring 53 in FIG. , The latching claw piece 58 is unlocked from the ratchet teeth 35. Therefore, the holder portion 57 is pushed down by pushing the finger hook portion 60.

The usage of the step for raising and lowering the truck bed according to the present invention can be variously selected. An example is as follows.
(1) Preparation Items In advance, the space between the upper metal part 7 and the lower metal part 8 is most widened, and the lower elastic part 22 and the upper elastic part 23 are in a contracted state.
(2) Set the upper metal fitting 7.
The upper holding piece 44 in the stored state is rotated downward by approximately 75 degrees by hand, and is parallel to the horizontal tilt R, and is automatically locked by the rotation stopper 54.
(3) Set the lower metal fitting 8.
The lower pressing piece 61 in the housed state is rotated upward by approximately 105 degrees by hand, and is parallel to the horizontal tilting R, and is automatically locked by the rotation stopper 55.
(4) The tilt R is sandwiched and fixed.
Holding the ladder 3 by hand, the ladder 3 is set so that the lower surface of the upper pressing piece 44 is in contact with the horizontal upper surface of the tilting R.
The finger hook portion 60 is pushed to disengage the locking claw piece 58 from the ratchet teeth 35, and the lower pressing piece 61 is raised up until it touches the lower surface of the lift R.
When it is sufficiently in contact with the lower surface of the ridge R, the finger hooking portion 60 is released and the rack teeth 35 are engaged so as not to return.
(5) Adjust the height of the ladder 3.

  The height of the ladder 3 is adjusted by adjusting the length of the support column 1 according to the height from the ground to the tilt R by expanding and contracting the upper and lower stretchable parts 23 and 22.

  When the upper telescopic portion 23 is expanded and contracted, as shown in FIG. 12, first, the lever 18 of the upper fixing bracket 13 is moved inward against the urging force of the coil spring 14, and the round hole 25 of the upper telescopic rod 23a The engagement with the engagement protrusion 20a is released. Thereafter, the upper telescopic rod 23a is moved up and down with respect to the column main body 1a, and the lever 18 is released when it is moved to an appropriate position.

  As a result, the spring receiving portion 20e is urged toward the support column 1 by the coil spring 14, the engagement protrusion 20a is engaged with the round hole 25 again, and the upper telescopic rod 23a is positioned and fixed with respect to the support column main body 1a.

  When the length adjustment of the column 1 is insufficient only by the expansion / contraction of the upper expansion / contraction part 23, the lower expansion / contraction part 22 is further expanded / contracted, so that the lever 19 of the lower fixing bracket 12 is moved to the coil spring 15 as shown in FIG. It moves to the inner side against the urging force, and the locking step portion 21a is unlocked from the square hole 26 of the lower telescopic rod 22a.

  Thereafter, the lower telescopic rod 22a is moved up and down with respect to the column main body 1a, and the lever 19 is released when it is moved to an appropriate position. As a result, the spring receiving portion 21d is urged toward the support column 1 by the coil spring 15, the locking corner portion 21a is again locked into the square hole 26, and the upper telescopic rod 23a is positioned and fixed with respect to the support column main body 1a.

  In this manner, the distance between the upper metal fitting 7 and the lower metal fitting 8 is grasped so that the mechanism 7 can be easily matched to the thickness of the lift R, and two expansion / contraction parts provided at the lower part of the upper metal fitting 7 and the lower metal fitting 8 are also provided. The grip position can be easily adjusted to the height of the tilting R by the (lower stretchable portion 22 and upper stretchable portion 23), and can be attached by applying an elevating step efficiently.

  In addition, when a person moves on the tilted tilt R when working on the truck bed, the load is supported by the column 1 via the lower bracket 8 and the ratchet teeth 35. Work can be done.

  Further, since the clasp part 23b does not have the step bar 3a, the step bar 3a is located above the R and does not obstruct the raising and lowering of the step, and it is safe to grasp the clue part 23b having a sufficient length. And it can move up and down smoothly.

  Further, when the tilt R is tilted vertically, the ladder 3 can be locked by inserting the locking piece 65 into the gap opening with the side surface of the truck bed. In this case, the upper pressing piece 44 may be folded and only the lower pressing piece 61 may be projected horizontally.

  In addition, even in a state where the tilt R is standing vertically, the ladder 3 can be fixed to the truck bed by hooking the locking piece 65 on the upper end of the tilt R.

  Also, either one or both of the upper metal fitting 7 and the lower metal fitting 8 may be folded, and either one may be set first. Unlike the embodiment, the lower pressing piece 61 of the lower metal fitting 8 is first provided. May be brought into contact with the lower surface of the tilting R, and then the upper pressing piece 44 may be tilted to sandwich the upper pressing piece 44 and the lower pressing piece 61.

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. It is a vertical side view of the principal part of the state which set the upper metal fitting and the lower metal fitting which show one Embodiment of the step for raising / lowering the truck bed of the present invention. It is a vertical side view of the principal part of the state which folded up the upper metal fitting and the lower metal fitting which show one embodiment of the step for raising / lowering the truck bed of the present invention. It is a side view which shows a part of lower metal fitting. It is a side view of an upper expansion-contraction part. It is a front view which shows an upper fixing metal fitting and its vicinity. It is a cross-sectional top view which shows an upper fixing metal fitting and its vicinity. It is a side view which shows an upper fixing metal fitting and its vicinity. It is a side view of a lower expansion-contraction part. It is a front view which shows the lower expansion-contraction part. It is a front view which shows the state which cancelled | released the lock | rock of the upper fixing metal fitting. It is a front view which shows the state which cancelled | released the lock | rock of the lower fixing metal fitting. It is a whole perspective view which shows the conventional raising / lowering ladder for trucks. It is a side view of the principal part of 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 10a protruding piece 11 hanging bracket Main body 12 Lower fixing bracket 13 Upper fixing bracket 14, 15 Coil spring 15a Spring receiving portion side end 15b Casing side end 16, 17 Housing 18, 19 Lever 20 Locking member 20a Engaging projection 20b Nut 20d Side wall plate 20e Spring receiving portion 21 Engagement Stop member 21a Locking corner portion 21b Side wall plate 21c Bolt hole 21d Spring receiving portion 21e Notch 22 Lower stretchable portion 22a Lower stretchable rod 23 Upper stretchable portion 23a Upper stretchable rod 23b Clue portion 23c Recessed step portion 24 Long hole 25 Round hole 26 Square hole 27 Leg 28 Bolt 29 Rubber 30, 31 Screw 32, 33 Bolt 34 Bolt 35 Chet teeth 36 Leaf spring 37 Base end portion 38 Handrail 39 Protrusion 40 Protruding portion 41 Groove 42 Clearance 43, 43a Protruding portion 44 Upper pressing piece 44a Supporting piece 44b Contacting plate 45 Rotating arm 45a Engaging step notch 45b Pushing corner 53 Torsion spring 54 Rotation stopper 54a Finger pressing piece 54b Horizontal locking piece 54c Projection piece 55 Rotation stopper 55a Finger pressing piece 55b Engagement edge 55c Flange 57 Holder part 58 Locking claw piece 59 Shaft 60 Finger hooking part 61 Lower holding part Piece 62 Support piece 63 Contact plate 63a Downward flange 64 Horizontal plate 65 Locking piece 66 Rotating part 66a Finger hook part

Claims (8)

  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. An upper bracket and a lower bracket that sandwich the tilt end from above and below are provided, and either or both of these upper and lower brackets are pivotally attached to the column so that they can be folded along the column. A step of raising and lowering the truck bed is characterized in that a rotatable stopper pivotally attached to the support column can be engaged with the rotatable pressing piece.   2. A step for raising and lowering a truck bed according to claim 1, wherein the upper metal fitting comprises a rotatable upper pressing piece and a rotation stopper.   2. A step for raising and lowering a truck bed according to claim 1, wherein the lower metal fitting comprises a rotatable lower pressing piece and a rotation stopper.   4. The upper pressing piece and the lower pressing piece each have a contact plate pivotably attached to the support piece, and a non-slip rubber is disposed on the surface of the contact plate. The truck bed lifting / lowering step according to any one of the above.   The lower bracket is provided on the holder that slides on the outside of the support column, and the bolt that penetrates and engages the long hole formed in the support column length direction is provided on the holder unit. The step for raising and lowering the truck bed according to any one of claims 1 to 4, provided between the holder portions.   4. A step for raising and lowering a truck bed according to claim 1 or 3, wherein a locking piece protruding downward is provided below the lower metal fitting.   The step for raising and lowering the truck bed according to any one of claims 1 to 5, wherein the column has an expansion / contraction part on either one or both of the upper and lower sides to slidably fit the expansion / contraction rod with respect to the column main body.   The support column has at least an expansion / contraction part that slidably fits the expansion / contraction rod with respect to the column main body. 6. A step for raising and lowering a truck bed according to claim 1, wherein the step is not provided above the mechanism, and a portion above the gripping mechanism is configured as a clue part during raising and lowering.

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