JP2007198000A - Ladder for trailer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ladder for a trailer, which is safely usable by being propped on a loading bed N of the trailer T. <P>SOLUTION: The ladder for the trailer is usable by being propped on the loading bed N of the trailer T, and formed of a ladder main body 3 which is set up by horizontally erecting rungs 2 between a pair of side frames 1, a mounting fitting 4 for hooking the ladder, which is attached to a peripheral frame body F of the loading bed N when the ladder main body 3 is propped on the loading bed N, and hook fittings 5 arranged on an upper edge of the ladder main body 3. The mounting fitting 4 has a mounting member 12 mounted on an upper surface Fa of the loading bed peripheral frame body F, a support member 13 abutted on and supported by an outer surface Fb of the peripheral frame body F, and a hook bar 11 arranged on an external surface of the support member 13 so as to have the hook fittings 5 hooked thereon. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a trailer lifting ladder that is used by leaning on a trailer bed.

  There has not been known a trailer-dedicated ladder that allows workers to move up and down the trailer when working on the trailer platform. Ordinary ladders that were installed horizontally at the required intervals were used as they were.

  When using an ordinary ladder leaning up against the frame of the trailer's cargo bed as it is, the ladder is easy to slide from the frame, so other workers other than the worker who goes up and down the ladder can lift the ladder. It had to be held and was very troublesome. In view of such a problem, an object of the present invention is to provide a trailer lifting ladder that can be stood on a peripheral frame of a trailer bed in a self-holding state and can be used safely.

Means for solving the above problems will be described with reference numerals of the embodiments described later. The invention according to the claims of the present invention is a trailer lifting ladder used by leaning on a loading platform N of a trailer T. There,
A ladder main body 3 in which a spade 2 is horizontally mounted on a pair of side frames 1 and 1 at a predetermined interval, and a ladder latch attached to a peripheral frame F of the loading platform N when the ladder main body 3 is leaned against the loading platform N. Mounting bracket 4 and hook metal fitting 5 provided on the upper end side of the ladder body 3,
The mounting bracket 4 hangs the mounting member 12 mounted on the upper surface Fa of the platform peripheral frame F, the support member 13 abutted and supported on the outer surface Fb of the platform peripheral frame F, and the hook bracket 5. It has the latching bar 11 provided in the outer surface side of the said supporting member 13 so that it may stop.

The invention according to claim 2 is a lifting ladder for a trailer used by leaning against a loading platform N of the trailer T,
A ladder main body 3 in which a spade 2 is horizontally mounted on a pair of side frames 1 and 1 at a predetermined interval, and a ladder latch attached to a peripheral frame F of the loading platform N when the ladder main body 3 is leaned against the loading platform N. Mounting bracket 4, hook metal fitting 5 provided on the upper end side of ladder body 3, and handrail 6 attached to side frame 1 on at least one side of ladder body 3,
The mounting bracket 4 hangs the mounting member 12 mounted on the upper surface Fa of the platform peripheral frame F, the support member 13 abutted and supported on the outer surface Fb of the platform peripheral frame F, and the hook bracket 5. It has the latching bar 11 provided in the outer surface side of the said supporting member 13 so that it may stop.

  According to a third aspect of the present invention, in the lift ladder for a trailer according to the first or second aspect, the magnet sheet 16 is attached to the mounting surface of the mounting frame 4 on the mounting member 12 of the mounting bracket 4. It is characterized by being.

  Claim 4 is the trailer lifting ladder according to claim 2 or 3, wherein the handrail 6 includes a handrail main body 14 and a handrail post 15, and stands upright with respect to the ladder main body 3. The lower end portion of the handrail support column 15 is pivotally attached to the side frame 1 of the ladder main body 3 so that the posture can be freely changed between the use posture and the storage posture that is folded from the use posture and overlapped with the ladder main body 3 in parallel. It is characterized by.

  According to a fifth aspect of the present invention, in the lift ladder for a trailer according to the fourth aspect, the handrail main body portion 14 includes an upper side main body portion 19 and a lower side main body portion 20, and the upper side main body portion 19 is located on the lower side. The main body is configured to be extendable and contractible.

  The trailer lifting ladder according to claim 4, wherein the handrail main body portion 14 includes an upper side main body portion 19 and a lower side main body portion 20, and the upper side main body portion 19 is on the lower side. The main body 20 is configured to be foldable.

  The effect of the invention by the above means will be described with reference numerals of the embodiments described later. According to the invention according to claim 1, when the ladder main body 3 is leaned against the loading platform N, the mounting member of the mounting bracket 4. 12 is placed on the upper surface Fa of the peripheral frame F, and the support member 13 of the mounting bracket 4 is brought into contact with and supported by the outer surface Fb of the peripheral frame F to attach the mounting bracket 4 to the peripheral frame F. Since the ladder main body 3 is self-held by hooking the hook metal fitting 5 on the ladder main body 3 side to the hook bar 11 on the mounting metal fitting 4 side, the operator does not have to hold the ladder main body 3 one by one. The use of the lifting ladder A does not require an extra worker, and the lifting ladder A can be used safely.

  According to the invention according to claim 2, as in the invention according to claim 1, the mounting bracket 4 is attached to the peripheral frame F, and the hook metal 5 on the ladder body 3 side is attached to the latch bar 11 on the mounting metal 4 side. Since the ladder main body 3 is self-held by being hooked, it is not necessary for the operator to hold the ladder main body 3 one by one, and there is no need for an extra worker to use the lifting ladder A. Since it can be used safely and the handrail 6 is attached to the handrail main body 14, the operator can move up and down more safely with respect to the loading platform N of the trailer T by the handrail 6. It becomes like this.

  According to the third aspect of the present invention, since the magnet sheet 16 is attached to the mounting surface of the mounting frame 4 on the upper surface of the loading frame peripheral frame F, the magnetic force of the magnet sheet 16 is increased. Thus, the mounting member 12 can be fixed to the upper surface Fa of the peripheral frame body F, and the mounting bracket 4 can be securely fixed to the peripheral frame body F, and there is no possibility that the mounting bracket 4 is unintentionally detached from the peripheral frame body F. .

  According to the invention according to claim 4, the handrail 6 is changed in posture between a use posture standing upright with respect to the ladder main body 3 and a storage posture folded from the use posture and overlapping the ladder main body 3 in parallel. Since the lower end portion of the handrail support column 15 is pivotally attached to the side frame 1 of the ladder main body 3, the handrail main body portion 14 is folded into the storage posture when the elevator ladder A is used. The whole is compact and very convenient for transporting and storing the lifting ladder A.

  According to the fifth aspect of the present invention, the upper main body portion 19 of the handrail main body portion 14 is configured to be extendable and contractable with respect to the lower main body portion. Can be safely moved up and down with respect to the loading platform N of the trailer T, and when the lifting ladder A is used, the upper side main body portion 19 is contracted with respect to the lower side main body portion 20, The whole is compact and convenient for transporting and storing the lifting ladder A.

  According to the invention which concerns on Claim 6, since the upper side main-body part 19 of the handrail main-body part 14 is comprised with respect to the lower side main-body part 20 so that folding is possible, the upper side main-body part 19 is used for the lower side main-body part at the time of use. 20 can be moved up and down safely with respect to the loading platform N of the trailer T, and when the lifting ladder A is used, the upper body portion 19 can be folded into the lower body portion 20. Thus, the whole is compact and convenient for transporting and storing the lifting ladder A. In addition, in such a folding structure, there is almost no overlapping portion between the constituent members of the upper-side main body 19 and the constituent members of the lower-side main body 20, so that the weight can be reduced.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a trailer lifting ladder A that is leaning on a peripheral frame F of a trailer bed N. FIG. FIG. 2 shows a mounting bracket 4 for hanging a ladder attached to the peripheral frame F, (a) is a front view of the mounting bracket 4, (b) is a side view, and (c) is a plan view. FIG. 3A shows the trailer lifting ladder A, FIG. 3A is a front view of the state in which the handrail 6 is folded into the storage position, and FIG. 3B is a side view. FIGS. 4A to 4C show a state in which the lifting ladder A is used for the trailer T having different heights. 5 (a) is an enlarged view of a portion surrounded by an arrow X in FIG. 1, showing a state in which the handrail 6 is in a use posture, and (b) is a cross-sectional view taken along the line II in (a). 6 (a) is a side view similar to FIG. 5 (a) showing a state in which the handrail 6 is folded into the storage position, FIG. 6 (b) is a cross-sectional view of the roll line of FIG. (A) is an end view as seen from (c).

  As can be seen from these drawings, the trailer lifting ladder A includes a ladder main body 3 in which a pair of side frames 1 and 1 are mounted on a pair of side frames 1 and 1 at a predetermined interval, and the ladder main body 3 is attached to a trailer T. When attaching to the loading platform N of the loading platform N, the mounting bracket 4 for hanging the ladder attached to the peripheral frame F of the loading platform N, the hook fitting 5 provided on the upper end side of the ladder body 3, and the one side of the ladder body 3 It comprises a handrail 6 attached to the frame 1. Each side frame 1 of the ladder main body 3 includes a side frame main body 7 and an expansion / contraction member 8 connected to the lower end portion of the side frame main body 7 so as to be freely adjustable. 9 is pivotally attached, and the bottom surface of the grounding base 9 is anti-slip. The peripheral frame F of the loading platform N of the trailer T is made of a steel material having a flat upper end surface and a wide width, unlike the turning outer plate provided on the loading platform of the truck. The mounting bracket 4 plays an important role.

  As shown in FIG. 2, the mounting bracket 4 for hanging the ladder includes a pair of left and right arms 10, 10 each having an approximately L shape with an upper piece 10 a and a lower piece 10 b, and lower pieces of both arms 10, 10. 10b, 10b, is attached over the hook bar 11 for hook metal fitting and the upper pieces 10a, 10a of both arms 10, 10, and is mounted on the upper surface Fa of the peripheral frame F of the loading platform N. The plate-like mounting member 12 and the plate-like supporting member which are attached to the lower pieces 10b and 10b of the arms 10 and 10 and are in contact with and supported by the outer surface Fb of the peripheral frame body F of the loading platform N. The magnet sheet 16 is adhered to the entire surface of the mounting member 12 on the lower surface thereof, that is, the mounting surface on the upper surface Fa of the load carrier frame F. A U-shaped handle 17 is attached to the lower end of the outer surface of the support member 13.

  The hook metal fitting 5 is formed in an L shape by a metal bar, and as shown in FIGS. 3 (a) and 3 (b), the side frame main body 7 of each side frame 1 forming the ladder main body 3 is provided. Each is fixed to the bracket 18 attached to the upper end of the outer side surface in a required inclined posture.

  Next, the structure of the handrail 6 will be described in more detail. The handrail 6 includes a handrail main body 14 having a rectangular frame shape composed of the vertical rods 14a, 14b, 14c and the horizontal rods 14d, 14e, and the handrail main body. 3 is composed of two handrail support columns 15 arranged in parallel with the horizontal rods 14d and 14e of the section 14, and as shown in FIG. As shown in FIG. 4, the lower end of each handrail support column 15 is attached to the side frame main body 7 of the side frame 1 so that the posture can be freely changed to a storage posture that is folded 90 ° from the use posture and overlaps the ladder main body 3 in parallel. It is pivotally attached.

As shown in FIGS. 5 to 7, a pivot bracket 22 is attached to the outer surface of the side frame body 7 at the lower pivot part of each handrail column 15. The bracket 22 is formed from (a) to (d) in FIG.
As can be seen from the figure, a square tube portion 23 for fitting a handrail strut portion in which a lower end portion of a handrail strut portion 15 formed in a square tube shape is slidably fitted, and a bottom plate portion of the square tube portion 23 It consists of mounting flange portions 24, 24 projecting to both sides along 23b, and the rectangular tube-shaped portion 23 is formed by an upper plate portion 23a, a bottom plate portion 23b, and left and right side plate portions 23c, 23c. The square tubular portion 23 is formed with cutout openings 25a and 25b having opening areas corresponding to the cross-sectional areas of the hollow portions 23o of the square tubular portion 23 at one end portions of the upper plate portion 23a and the bottom plate portion 23b, respectively. ing. Further, as shown in FIGS. 9B and 9C, bolt insertion long holes 26 are formed in the left and right side plate portions 23 c of the rectangular tubular portion 23.

  In order to attach the handrail support column 15 of the handrail 6 to the side frame 1 by the pivot mounting bracket 22 having the above-described structure, first, the mounting flange portions 24 and 24 of each bracket 22 are shown in FIGS. At the predetermined position of the side frame 1, the bolts 27 and nuts 28 are attached and fixed. Thus, as shown in FIG. 7, the handrail support column 15 is fitted into the hollow portion 23o of the rectangular tube-shaped portion 23 of the bracket 22, and bolts are inserted into the left and right side plate portions 23c, 23c of the rectangular tube-shaped portion 23. A pivoting bolt 29 is inserted from the long holes 26, 26 into a bolt insertion hole (not shown) provided at the lower end of the handrail support column 15, and a nut 30 is attached to the tip of the bolt.

  5 and 7 show a state in which the pivot bolt 29 attached to the lower end of each handrail support column 15 is located at the lower end of the bolt insertion long hole 26 of the side plate portion 23c of the rectangular tube-shaped portion 23. In this state, the lower end portion of the handrail support column 15 is held by the hollow portion 23o of the square tubular portion 23, whereby the handrail 6 stands upright vertically with respect to the ladder body 3 as shown in the figure. Retained. Thus, when the handrail main body 14 is pulled upward along the longitudinal direction of the handrail support column 15 from this use posture, the pivotal mounting bolts 29 of the handrail support columns 15 extend along the bolt insertion long holes 26. Since the bolt 29 is in sliding contact from the lower end side to the upper end side, the handrail main body portion 14 is pulled inward while the bolt 29 is in contact with the upper end of the long hole 26, so that the handrail post portion 15 Is turned around the pivot-mounting bolt 29 at the lower end, and the handrail 6 is folded as shown in FIGS.

  Further, the handrail 6 is provided with a lock means 31 for locking the handrail 6 to a vertically used posture. As shown in FIG. 6, the locking means 31 penetrates the side frame 1 at a position close to the pivotal mounting bracket 22, and a front end locking portion 32 a is provided on the upper plate portion 23 a of the rectangular tube-shaped portion 23. The lock pin 32 includes a substantially L-shaped lock pin 32 that is engaged with a pin engagement hole (not shown) provided at the lower end portion of the handrail support column 15 from the pin hole 33. The tip locking portion 32a is locked to the pin locking hole (not shown) of the handrail support column 15 by a coil spring 36 interposed between the nut 35 screwed to the side frame 1 and the side frame 1. Is being energized.

  Accordingly, in the state where the handrail 6 is set in a use posture in which the handrail 6 stands vertically with respect to the handrail main body portion 14, the front end locking portion 32 a of the L-shaped lock pin 32 is moved from the pin hole 33 of the pivotal mounting bracket 22 to the handrail post portion. By locking in the 15 pin locking holes 34, the handrail 6 can be locked in the use posture. Further, when the handrail 6 is folded from the use posture to the storage posture, the L-shaped lock pin 32 is pulled outward against the urging force of the coil spring 36 to handrail the tip locking portion 32a of the lock pin 32. What is necessary is just to make it detach | leave from the said pin latching hole of the support | pillar part 15. FIG. In addition, what is necessary is just to provide the locking means 31 in the one pivot mounting bracket 22 side.

  A method of using the trailer lifting ladder A having the above-described configuration will be described. When the lifting ladder A is used, the mounting bracket 4 is attached to a required position of the loading platform N. That is, as shown in FIGS. 1 and 2, the mounting member 12 of the mounting bracket 4 is mounted and fixed on the upper surface Fa of the loading platform peripheral frame F via the magnet sheet 16, and the support member 13 is fixed to the loading platform circumferential frame. The outer surface Fb of the body F is contacted and supported.

  After the attachment bracket 4 is attached and fixed to the loading platform peripheral frame F in this way, the ladder body 3 is hooked on the attachment bracket 4. When the ladder main body 3 is latched, the handrail 6 is set in a use posture perpendicular to the ladder main body 3 and is held in the use posture by the lock means 31, and the hook metal fitting 5 at the upper end of the ladder main body 3 is used. , 5 are latched on the latching bar 11 on the outer surface side of the support member 13 as shown in (a) and (b) of FIG.

  At this time, since the height of the loading platform N differs depending on the size of the truck, the side frame 1 of the ladder main body 3 is appropriately expanded and contracted so that the ladder main body 3 is inclined with respect to the ground G by a required inclination angle θ (preferably 60 °). At this position, the hook metal fitting 5 on the ladder body 3 side is hooked on the hook bar 11 on the mounting metal fitting 4 side. 4A shows a state where the height H1 of the loading platform N is as low as 1490 mm, for example, and shows a state in which the ladder body 3 is set to a minimum, and FIG. 4B shows the height H2 of the loading platform N as 1630 mm, for example. The case where the ladder body 3 is extended and set appropriately in the state of (a) is shown in a slightly high case, and (c) is the case where the height H3 of the loading platform N is as high as 1700 mm, for example, and the ladder body 3 is extended to the maximum. This shows the set state.

  When the elevating ladder A is used while leaning on the loading platform N of the trailer T as described above, the mounting bracket 4 is attached to the peripheral frame body F of the loading platform N when the ladder main body 3 is leaned against the loading platform N. The mounting member 4 is mounted on the peripheral frame F by mounting the mounting member 12 on the upper surface Fa of the peripheral frame F and supporting the support member 13 of the mounting bracket 4 on the outer surface Fb of the peripheral frame F. However, since the ladder main body 3 is self-held by hooking the hook metal fittings 5 and 5 on both sides of the upper end portion of the ladder main body 3 to the hook bar 11 of the mounting metal fitting 4, the operator holds the ladder main body 3 in place. Therefore, it is not necessary to hold the lift ladder A one by one. Therefore, an extra worker is not required to use the lift ladder A, and the lift ladder A can be used safely.

  Further, when the lifting ladder A is used, the handrail 6 is attached to one side of the ladder body 3, so that the operator can safely lift and lower the loading platform N of the trailer T by the handrail 6. . In this embodiment, the handrail 6 is attached only to the side frame 1 on one side, but the handrail 6 may be attached to the side frames 1 and 1 on both sides. In this embodiment, the handrail 6 is installed only in the upper side region of the side frame 1, but it may be attached so as to cover the entire length of the side frame 1.

  Further, the handrail 6 has a use posture standing upright with respect to the ladder main body 3 as shown in FIG. 1 and a storage posture that is folded from this use posture and overlaps the ladder main body 3 in parallel as shown in FIG. Therefore, when the elevator ladder A is used, the handrail body 14 is folded into the storage attitude, so that the whole is compact, and the elevator ladder A is transported and stored. Very convenient to.

  In addition, since the magnet sheet 16 is attached to the mounting surface of the mounting bracket 4 on the upper surface Fa of the loading frame peripheral frame F, which is the lower surface, the mounting member 12 is mounted by the magnetic force of the magnet sheet 16. The mounting member 12 can be fixed to the upper surface Fa of the peripheral frame body F so that the mounting bracket 4 can be securely fixed to the peripheral frame body F, and there is no possibility that the mounting bracket 4 is unintentionally detached from the peripheral frame body F.

  FIG. 10 shows a handrail 6 according to another embodiment. The handrail 6 includes a handrail main body portion 14 and a handrail post portion 15. The handrail main body portion 14 includes an upper side main body portion 19 and a lower side portion. The upper body part 19 is configured to be extendable and retractable with respect to the lower body part 20. That is, the upper side main body portion 19 of the handrail main body portion 14 is formed in a U shape by both left and right vertical rods 19 a and 19 a and a horizontal rod 19 b, and the both vertical rods 19 a and 19 a are both left and right vertical The hooks 20a and 20a are fitted in a telescopic manner, and can be expanded and contracted between a contracted position indicated by a solid line and an extended position indicated by an imaginary line in FIG. Reference numeral 21 in the figure denotes a stopper for locking the upper body 19 to the lower body 20 in the contracted position and the extended position. This stopper 21 is attached to the lower body 20 by a coil spring (not shown). Each of the vertical rods 20a is composed of a stopper pin 21a biased to the side of the upper main body 19 so that the tip of the pin 21a is inserted through the pin of each vertical rod 20a of the lower main body 20 at the contracted and extended positions. A hole (not shown) is inserted into a pin insertion hole (not shown) of the vertical rod 19a of the upper body 19 to lock the upper body 19 in the contracted position and the extended position.

  Similarly to the handrail 6 shown in FIGS. 1 to 9, the handrail 6 shown in FIG. 10 is also used in a vertical posture with respect to the ladder main body 3 and is folded from this use posture and parallel to the ladder main body 3. The lower end of the handrail support column 15 is pivotally attached to the side frame 1 of the ladder main body 3 so that the posture can be changed to an overlapping storage posture, and FIGS. 10A and 10B are folded into the storage posture. Indicates the status.

  Like the handrail main body 14 shown in FIG. 10, according to the handrail 6 in which the upper side main body 19 is configured to be expandable and contractable with respect to the lower side main body 20, the phantom lines shown in FIG. Thus, by extending the upper side main body part 19 with respect to the lower side main body part 20, the upper side main body part can be safely moved up and down with respect to the loading platform N of the trailer T. By contracting 19 with respect to the lower-side main body 20, the whole becomes compact and convenient for transporting and storing the elevating ladder A.

  FIG. 11 shows a handrail 6 according to another embodiment. The handrail 6 includes a handrail main body portion 14 and a handrail post portion 15. The handrail main body portion 14 includes an upper side main body portion 19 and a lower side portion. The upper body part 19 is configured to be foldable with respect to the lower body part 20. That is, the upper side main body portion 19 of the handrail main body portion 14 is formed in a rectangular frame shape with left and right vertical rods 19a, 19a, an upper horizontal rod 19b, and a lower horizontal rod 19c, and the lower side main body portion 20 is It consists of vertical rods 20a, 20a and upper horizontal rods 20b. The lower horizontal rod 19c of the upper side main body portion 19 is pivotally attached to the upper horizontal rod 20b of the lower side main body portion 20 by a hinge 37, whereby the upper side main body 19 The part 19 is folded from the use posture as shown by solid lines in FIGS. 11A and 11B to the storage posture as shown by phantom lines in FIG. 11B.

FIG. 12 shows a lock mechanism 38 that holds the upper body 19 in a use posture. FIG. 12A is an enlarged side view of a portion surrounded by an arrow Y in FIG. 11B, and FIG. End view from arrow Z, (c)
FIG. 4B is a side view similar to FIG. 2A, showing a state when the upper main body of the handrail main body is folded with respect to the lower main body. As can be seen from FIG. 12 (a), the locking mechanism 38 is provided on the opposite side of the hinge 37 that pivotally attaches the upper body portion 19 and the lower body portion 20 to the upper side. An arm hooking portion 39 is provided at the lower end of the rear side of the vertical rod 19a of the main body 19, and one end of the fastening lever 40 is pivotally attached to the upper end of the rear side of the vertical rod 20a of the lower side main body 20. One end portion of a rectangular ring arm 41 is pivotally attached to the pivoting end portion side of the tightening lever 40.

  When the handrail 6 is used, if the upper-side main body portion 19 folded with respect to the lower-side main body portion 20 is rotated upward and deployed in a use posture that is flush with the lower-side main body portion 20, the handrail 6 rotates further. However, the upper body 19 is held flush with the lower body 20 by the lock mechanism 38 so that the upper body 19 does not fall down. Therefore, the lock mechanism 38 hooks the tip end side of the ring arm 41 on the lower body part 20 side to the arm latch part 39 on the upper body part 19 side from the state shown in FIG. After stopping, the front end of the tightening lever 40 is pivoted downward and brought into contact with the rear side surface of the vertical rod 20a to obtain a state as shown in FIGS. Upper body part via ring arm 41 and arm latching part 39 Attract Tate杆 19a of 9 to Tate杆 20a side of the lower body part 20, thereby retaining the upper body part 19 to the use position.

  The tightening lever 40 is pressed against the rear side surface of the vertical rod 20a by a biasing force of a spring (not shown) provided on the pivoting portion side. Further, when the tightening lever 40 abuts on the rear side surface of the vertical rod 20a, the projecting piece 42 protruding from the rear side surface of the vertical rod 20a is inserted into a slit 43 provided in a required portion of the lever 40. It is designed to be locked.

  According to the handrail 6 in which the upper side main body portion 19 of the handrail main body portion 14 is configured to be foldable with respect to the lower side main body portion 20 as described above, the upper side main body portion is shown in FIG. By deploying 19 in a state of being flush with the lower-side main body portion 20, it is possible to safely move up and down with respect to the loading platform N of the trailer T. By folding so as to overlap the side main body 20, the whole becomes compact and convenient for transporting and storing the elevating ladder A. In addition, such a folding structure has almost no overlapping portion between the constituent members of the upper body portion 19 and the lower body portion 20 as compared with the telescopic structure shown in FIG. it can.

It is a side view of the raising / lowering ladder for trailers used leaning on the surrounding frame body of the loading platform of a trailer. FIG. 3 shows a mounting bracket for attaching a ladder to a peripheral frame of a loading platform, in which (a) is a front view of the mounting bracket, (b) is a side view, and (c) is a plan view. (a) is a lifting ladder for a trailer, (a) is a front view with the handrail folded to a storage position, and (b) is a side view. (a)-(c) is a side view which shows the state which uses a raising / lowering ladder for the trailer from which height differs. (a) is the enlarged view of the part enclosed by the arrow X of FIG. 1, the state which has a handrail in a use attitude | position is shown, (b) is the II sectional view taken on the line of (a). (a) is a side view similar to (a) of FIG. 5 showing a state in which the handrail is folded into the storage position, (b) is a cross-sectional view of the roll line of (a), and (c) is (a) It is the end view seen from (c). (a) is a front view of the pivoting end portion of the handrail support column of the handrail in the use posture, and (b) is a sectional view of the knee line of (a). (a) is a front view of the pivoting end portion of the handrail support column of the handrail in the stowed position, and (b) is a sectional view of the hoo line of (a). (a) is a front view showing the pivot bracket, (b) is a side view of the pivot bracket from above, (c) is a side view from below, and (d) is an end view from the right. is there. (a) is a front view showing an embodiment of a handrail in which the upper body portion of the handrail body portion is extendable and retractable with respect to the lower body portion, and (b) is a side view. (a) is a front view showing an embodiment of a handrail in which the upper body part of the handrail body part is foldable with respect to the lower body part, and (b) is a side view. (a) is an enlarged side view of the part surrounded by the arrow Y in FIG. 11 (b), (b) is an end view as seen from the arrow Z in (a), and (c) is the upper body of the handrail body. It is a side view similar to (a) showing a state when it is folded with respect to the lower body.

Explanation of symbols

A Lifting ladder 1 Side frame 2 Spade 3 Ladder body 4 Handrail 5 Hook fitting 6 Handrail 7 Side frame body 8 Telescopic member 11 Holding bar 12 Placement member 13 Support member 14 Handrail body portion 15 Handrail support portion 16 Magnet Sheet

Claims (6)

A trailer lifting ladder used by leaning on a trailer bed,
A ladder main body in which a spade is horizontally mounted on a pair of side frames at required intervals, a mounting bracket for attaching a ladder to the peripheral frame body of the ladder main body, and a ladder main body It consists of a hook fitting provided on the upper end side,
The mounting bracket includes a mounting member that is mounted on the upper surface of the platform peripheral frame body, a support member that is in contact with and supported by the outer surface of the platform peripheral frame body, and the support member that is hooked to the hook bracket. A trailer elevating ladder comprising a latch bar provided on an outer surface side. A trailer lifting ladder used by leaning on a trailer bed,
A ladder main body in which a spade is horizontally mounted on a pair of side frames at required intervals, a mounting bracket for attaching a ladder to the peripheral frame body of the ladder main body, and a ladder main body It consists of a hook fitting provided on the upper end side and a handrail attached to the side frame on at least one side of the ladder body,
The mounting bracket includes a mounting member that is mounted on the upper surface of the platform peripheral frame body, a support member that is in contact with and supported by the outer surface of the platform peripheral frame body, and the support member that is hooked to the hook bracket. A trailer elevating ladder comprising a latch bar provided on an outer surface side.   The trailer elevating ladder according to claim 1 or 2, wherein a magnet sheet is attached to the mounting surface of the mounting bracket on the mounting surface on the upper surface of the loading frame peripheral frame body.   The handrail is composed of a handrail main body portion and a handrail post portion, a use posture standing upright with respect to the ladder main body, and a storage posture that is folded from this use posture and overlaps the ladder main body in parallel. The trailer lifting ladder according to claim 2 or 3, wherein a lower end portion of the handrail support column is pivotally attached to a side frame of the ladder main body so that the posture can be freely changed.   The said handrail main-body part consists of an upper-side main-body part and a lower-side main-body part, and the upper-side main-body part is comprised with respect to the lower-side main-body part so that expansion-contraction is possible. Lifting ladder for trailers. The said handrail main-body part consists of an upper-side main-body part and a lower-side main-body part, and the upper-side main-body part is comprised so that folding with respect to the lower-side main-body part is possible. Lifting ladder for trailers.

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