JP6685556B2 - Getting on and off steps for trucks - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading step for a truck capable of getting on / off a truck in a stable posture.

  As disclosed in Patent Document 1, as one of the steps for getting on and off a truck for a person to get on and off a truck bed, "a plurality of upper and lower treads are arranged in a pair on the left and right with respect to a rectangular frame-shaped frame. It is foldably connected via a parallel link mechanism, and a pair of left and right hooks that are fitted into the gap between the floor plate of the truck and the swing plate in the open state are attached to the horizontal part above the frame. Are known. When using the boarding / alighting step, insert a pair of left and right hooks in the gap between the floor plate of the truck and the swing plate in the open state to cause the folded treads to be horizontal, and when not in use, reverse the above. Manipulation has been done to remove the boarding / alighting steps from the truck bed.

  Since the conventional step for getting on and off the truck is like getting on and off the stairs without the handrail, if the balance is lost during getting on and off, there is a risk of falling. The height of the bed of the truck from the ground is considerably high for a heavy-duty truck having a large carrying weight, and therefore there is a great risk of getting on and off.

Design Registration No. 1511224

  An object of the present invention is to enable a person to safely get on and off a truck, even in a truck having a high truck.

In order to solve the above-mentioned problems, the invention of claim 1 is such that a plurality of upper and lower treads are foldably connected to a rectangular frame through a pair of left and right parallel link mechanisms, and a horizontal portion above the frame is connected. In the step for getting on and off the truck, a pair of left and right hooks fitted in the gap between the floor plate of the truck and the swing plate in the open state are attached,
Each of the parallel link mechanisms, each of the vertically movable links arranged in parallel with the vertical portion of the frame, extends above the uppermost step plate, and extends above each of the vertically movable links. The handrail bars are detachably attached to the respective parts.

  According to the first aspect of the present invention, a pair of left and right parallel link mechanisms that foldably connect a plurality of upper and lower tread plates to a rectangular frame-shaped frame are configured, and each vertical link parallel to a vertical portion of the frame. The movable link is extended above the uppermost step plate to form an upper extension portion, and the handrail bars are detachably attached to the respective upper extension portions, so that When a person is getting on and off the loading platform, a pair of left and right handrail bars can be gripped to get on and off. Therefore, the posture of the person getting on and off the loading platform of the truck is stable, and there is no danger of losing the balance during the getting on and off and accidentally falling.

  Also, when mounting the boarding / unloading step to the truck bed, a pair of hooks, which are integrally provided on the horizontal part above the frame of the boarding / alighting step where each tread is in a folded state, are opened and closed with the floor board of the truck. Insert the pair of left and right handrail bars to the side of the person standing on the side of the truck (the side away from the truck bed) in this state to activate the pair of left and right parallel link mechanisms. Then, the left and right vertical movable links that form the parallel link mechanism are separated from the loading platform, so that the vertical movable links are connected to the upper and lower connecting links that connect the vertical movable links to the vertical portions of the frame. The treads are horizontally arranged and fixedly arranged. In this way, even when mounting the loading / unloading step on the truck bed, it is possible to horizontally arrange the folded treads by using the handrails that are detachably attached to the pair of left and right vertically movable links. It will be easy.

According to a second aspect of the present invention, in the first aspect of the present invention, the pipe-shaped handrail bar is externally fitted to the outside of the upward extending portion of the vertical movable link, and the handrail bar is a fixture. It is characterized in that it is fixed to the upwardly extending portion of the vertically movable link via.

According to the invention of claim 2 , since the pipe-shaped handrail bar is externally fitted to the outer side of the vertically extending portion of the vertically movable link, the hand for the vertically extending portion of the vertically movable link is provided. It is easy to attach and remove the sliding bar.

  According to a third aspect of the invention, in the second aspect of the invention, the vertical movable link and each connecting link of each stage forming the parallel link mechanism are connected via a connecting pin, and the vertical movable link extends upward. The handrail bar inserted from the upper end of the installation portion in an externally fitted state is configured to stop moving downward by contacting the uppermost connecting pin.

  According to the invention of claim 3, the pipe-shaped handrail bar is simply inserted from the upper end of the upward extension of the vertically movable link in an externally fitted state, and the lower end of the handrail bar is connected to the uppermost connecting link. By contacting the connecting pin that connects the vertically movable link, the downward movement of the handrail bar with respect to the upwardly extending portion of the vertically movable link is stopped. That is, since the connecting pin functions as a regulating member that regulates the lower moving end of the handrail rod, it is not necessary to provide a dedicated regulating member.

  According to the present invention, a pair of left and right parallel link mechanisms that foldably connect a plurality of upper and lower tread plates to a rectangular frame-shaped frame is configured, and each vertically movable link parallel to the vertical portion of the frame is , The upper extension is formed to extend above the uppermost tread, and the handrail bars are detachably attached to the upper extension, so When a person gets on and off, he / she can grab a pair of left and right handrails to get on and off, and the person's getting on / off posture with respect to the loading platform of the truck is stable. Therefore, there is no danger of losing the balance during the getting on / off and accidentally falling. In addition, even when mounting the loading / unloading frame on the truck bed, the use of the handrails that are detachably attached to the pair of left and right vertically movable links facilitates the work of horizontally arranging the folded treads. Become.

  In particular, the handrail bar is formed into a pipe shape and is externally inserted into the upper extension portion of the vertically movable link, and the handrail rod is fixed to the upper extension portion of the vertically movable link via a fixture. The handrail bar can be easily attached to and detached from the vertically extending portion of the vertically movable link.

FIG. 3 is a perspective view showing a state in which the treads A ₁ and A _{2 of the} step S ₁ for getting on and off the truck according to the first embodiment of the present invention are opened. FIG. 3 is a perspective view of a step S ₁ for getting on and off a truck according to the first embodiment of the present invention in which the treads A ₁ and A ₂ are in a folded state. (A), (b) is a right side view and a front view of a truck passenger step S ₁ of the first embodiment of the present invention in a state where step board A _1, A ₂ are opened, respectively. (A), (b) is a right side view and a front view of a truck passenger step S ₁ of the first embodiment of the present invention, each step board A _1, A ₂ folded state. FIG. 4 is a half cross-sectional view taken along line XX of FIG. (A), (b) is an enlarged sectional view of FIG. 5, respectively of the Y ₁ -Y ₁ line, and Y ₂ -Y ₂ line. FIG. 3 is a perspective view showing a state in which the truck loading / unloading step S _{1 according} to the first embodiment of the present invention is installed on the side of the loading platform 54 of the truck T. (A), (b), (c) is a side view showing a process of installing a truck passenger step S ₁ of the first embodiment of the present invention on the side of the bed 54 of truck T. (A), (b), (c) is a view of either the layout of the track for boarding step S ₁ for the loading platform 54 of the track T from different directions. (A), (b) is a perspective view of a folded state and an open state truck passenger step S ₂ of the second embodiment of the present invention, respectively.

  Hereinafter, the present invention will be described in more detail with reference to a plurality of examples.

First, with reference to FIG. 1 to FIG. 6, the configuration of the truck loading / unloading step S ₁ according to the _first embodiment of the present invention will be described. In the step S ₁ for getting on and off the truck of the first embodiment, the two upper and lower treads A ₁ and A ₂ are foldably connected to a rectangular frame F ₁ via a pair of left and right parallel link mechanisms P _1. It has a different structure. The rectangular frame-shaped frame F ₁ is a pipe frame composed of a pipe having a circular cross section, in which a pair of vertical portions F ₁ a are arranged facing each other in the left-right direction and a pair of horizontal portions F ₁ b. Are arranged so as to face each other in the vertical direction, and are integrated at the curved corner portion.

Each of the upper and lower treads A ₁ and A ₂ has a plurality of screws 3 on the upper surface on the side of each bent corner of each tread mount 1 and 2 in which a pipe body having a circular cross section is bent in a U shape. They are attached together by a fixed rivet R ₀ . Each of the tread mounts 1 and 2 is formed in a U-shape as a whole by connecting one ends of parallel arranging portions 1a and 2a arranged in parallel to each other by connecting portions 1b and 2b. Although it has the same width as the width of the frame F ₁ (equal to the outer dimension of the pair of vertical portions F ₁ a arranged opposite to each other), the parallel arrangement portion ₁ a of the tread A ₁ arranged on the upper stage is It is shorter than the parallel arrangement portion 2a of the tread A ₂ arranged in the lower stage. The base end portions (end portions on the opposite side of the connecting portions 1b and 2b) of the parallel arrangement portions 1a and 2a of the upper and lower tread plate mounting bodies 1 and 2 are connected to each other through the pair of connecting pieces 4 and 5, respectively. It is rotatably connected to each vertical portion F ₁ a of the frame F ₁ . That is, the one-to-one pair of connecting pieces 4 and 5 are integrated with the parallel arrangement portions 1a and 2a of the upper and lower tread mounts 1 and 2 by a plurality of fixed rivets R ₁ . for each vertical portion F ₁ a of frames F ₁ are pivotally connected by a connecting rivet R ₂ of one, the shaft portion which is pivotally connected by a connecting rivet R ₂ of one, These are referred to as rotation connecting shafts C ₁ and C ₂ , respectively.

On the other hand, as shown in detail in FIGS. 5 and 6, the tread mounts ₁ and ₂ of the upper and lower treads A ₁ and A ₂ are portions equidistant from the vertical portions F ₁ a of the frame F _1. , Each of which is rotatably connected to the vertically movable link L ₁ by a connecting rivet R ₃ , and the parallel arrangement portions of the tread mounts 1 and 2 of the vertically movable link L ₁ through the respective connecting rivets R _3. 1a, the concatenated axis portion and 2a, respectively referred to as pivotal coupling shaft C _3, C _4. Here, between the upper and lower rotary connecting shafts C ₁ and C ₂ in the vertical portion F ₁ a of the frame F ₁ functions as a vertical fixed link L ₂ and also the integrated tread mounts 1, 1. the parallel arrangement portion 1a of the 2, 2a and between the left and right respective rotary coupling shaft C _1, C ₃ of the connecting members 4, 5, and between the respective rotary coupling shaft C _2, C _4, respectively connecting links L ₃ , and functions as L _4. Then, the vertical movable link L ₁ and the vertical fixed link L ₂ arranged in parallel on the left and right, and the connecting links L ₃ and L ₄ arranged in parallel on the upper and lower sides make a total of four links L _{1 to} L ₄ to make them parallel to each other. The link mechanism P ₁ is formed.

Further, a pair of left and right hooks 6 are integrally attached to the horizontal portion F ₁ b above the frame F ₁ . As shown in FIGS. 7 and 8, the pair of hooks 6 have a U-shape that opens downward and are formed between the floor plate 51 of the truck T and the swing plate 52 in the open state. By being inserted into the gap 53 and fitted to the outer side of the upper end of the swing plate 52 in the open state, the loading / unloading step S ₁ for the truck can be held vertically on the side of the loading platform 54 of the truck T. A hooking tool for suspending and installing the swing plate 52 in the open state.

The vertically movable link L ₁ is a lot-shaped member having a U-shaped cross section and is arranged with its opening side facing outward, so that each of the tread plates is arranged as shown in FIGS. 5 and 6. parallel arrangement portion 1a of the mounting body 2, and 2a, a bottom plate portion 11 of the handrail rods H, are rotatably connected via a connecting rivet R ₃ and spacer tube 13. Therefore, a handrail rod insertion space 14 is formed between the parallel arrangement portions 1a and 2a of the tread plate mounts 1 and 2 and the bottom plate portion 11 of the vertically movable link L ₁ . The portion of the vertically movable link L _{1 that} functions as a link is up to the portion immediately above the rotation coupling shaft C ₃ , but the vertically movable link L ₁ extends significantly above the rotation coupling shaft C _3. By doing so, the upper extension L ₁ a for inserting the pipe-shaped handrail rod H described later in an externally fitted state is integrally formed, which is a feature of the present invention.

That is, as shown in FIGS. 1 to 6, the handrail bar H is a pipe-shaped member, and the vertically movable link L ₁ extends upward until the lower end surface abuts the spacer cylinder 13. It is relatively inserted into the portion L ₁ a in an externally fitted state. The nut body 15 is fixed to the bottom plate portion 11 in the middle of the upper extension L ₁ a of the vertically movable link L ₁ , and the handrail bar H is inserted outside the upper extension L ₁ a. With the lower end surface in contact with the spacer cylinder 13, a bolt body 17 with a grip portion is inserted into a through hole 16 provided in a portion near the lower end portion of the handrail rod H, and screwed to the nut body 15. By doing so, the handrail bar H is temporarily fixed to the upwardly extending portion L ₁ a of the vertically movable link L ₁ . The upper end opening of the handrail rod H is closed by a cap body 8.

Then, in order to vertically install the loading / unloading step S ₁ for the truck on the side of the loading platform 54 of the truck T, as shown in FIG. 7 and FIG. 8, the tilt plate 52 on one side of the truck T is set outward. When the tilt plate 52 is opened by rotating 180 °, a gap 53 is formed between the tilt plate 52 and the floor plate 51 in the open state. The handrail bars H are respectively inserted into the upwardly extending portions L ₁ a of the pair of left and right vertically movable links L _{1 in} the folded boarding / alighting step S ₁ for the truck in an externally fitted state, and the handrail bars H are gripped by the grip portions. It is fixed to the upper extending portion L ₁ a by the attached bolt body 17. In this state, as shown in FIG. 8A, the worker M is integrally attached to each upper extension L ₁ a of the pair of left and right vertical movable links L ₁ of the truck entry / exit step S ₁ . When the boarding step S ₁ is lifted by holding each of the handrail bars H and the insertion plate portions 6a of the pair of hooks 6 attached to the horizontal portion F ₁ b above the frame F ₁ are inserted into the gap 53, By the weight of step S _1, the pair of hooks 6 are fitted to the upper end of the swing plate 52 in the open state, so that the upper half portion of the frame F ₁ is in close contact with the swing plate 52 and the open state swings. The boarding / alighting step S ₁ is held vertically with respect to the plate 52 and is installed in a suspended state.

In the above state, when the pair of handrail bars H are pulled toward the worker M, the parallel link mechanism P ₁ in the closed state is gradually opened as shown in FIGS. 8B and 8C. , The upper and lower tread mounts 1 and 2 are horizontally arranged. Thus, the parallel arrangement portion 1a of the step boards mounting body 2, each end face of the portion forming the connecting link L _3, L ₄ in 2a is, the front surface of the vertical portion F ₁ a of frames F ₁ By abutting, rotation beyond this is prevented, and the horizontal postures of the treads A ₁ and A ₂ integrally attached to the tread attachments ₁ and ₂ are maintained. The vertical portion F of the frame F ₁ in the connecting pieces 4 and 5 forming the connecting links L ₃ and L ₄ so that the end faces of the parallelly arranged portions 1a and 2a of the tread mounts 1 and 2 act as described above. The portion on the side of the vertical fixed link L ₂ which is ₁ a is bent upward. Finally, one foot of the operator M depresses the lower step plate A ₂ downward so that the step plate mounting bodies 1 and 2 can be reliably positioned at the pivot ends. As a result, as shown in FIGS. 7, 8 (c) and 9, the boarding / alighting step S ₁ provided with the pair of left and right handrail bars H is held vertically on the swing plate 52 of the truck T in the open state. It will be installed in a hanging form. That is, the horizontal portion F ₁ b below the frame F ₁ of the boarding / alighting step S ₁ is arranged apart from the ground, and only the pair of left and right handrail bars H are arranged above the floor plate 51.

As described above, by using the handrail bars H integrally attached to the upwardly extending portions L ₁ a of the pair of vertically movable links L ₁ , the step S ₁ for getting on and off the side of the loading platform 54 of the truck T is performed. Can be easily installed.

  Therefore, when the worker M gets on and off the platform 54 of the truck T, as shown in FIG. 7 and FIG. 8C, the operator gets on and off in a posture in which the pair of left and right handrail bars H are held by both hands. Therefore, the worker M can get on and off the platform 54 in a stable posture. Therefore, there is no risk that the worker M loses balance and falls while getting on and off the truck 54. In particular, in the case of the large truck T, the height of the cargo bed 54 becomes considerably high, so that it is particularly effective in getting on and off the cargo truck 54 of the large truck T.

Further, in order to change the arrangement position of the boarding / alighting step S ₁ of the truck T with respect to the loading platform 54, the treads A ₁ and A ₂ can be moved with the pair of left and right handrail bars H being left open, It is also easy to change the arrangement position of T with respect to the cargo bed 54. When the boarding / alighting step S ₁ is not used, as shown in FIG. 2, the pair of handrail bars H are separated and the treads A ₁ and A ₂ are folded.

Next, with reference to FIG. 10, regarding the truck loading / unloading step S ₂ of the _second embodiment, only portions different from the truck loading / unloading step S _{1 of the} first embodiment will be briefly described. The boarding / alighting step S ₂ is used for a large-sized truck having a high loading platform, and the bottom board A ₃ is added to the boarding / alighting step S _{1 of the} first embodiment to make a total of three board treads A. _{1 to} A ₃ are provided.

The frame F ₂ has a long U-shape, and has a configuration in which only the upper end sides of a pair of vertical portions F ₂ a arranged in parallel are connected by a horizontal portion F ₂ b. That is, each of the middle and upper step plates A ₁ and A ₂ is configured to be folded toward the frame F ₂ by the parallel link mechanism P ₁ , and the middle step plate mounting body 2 and the lower step plate mounting body 7 are formed. By being connected by another vertical movable link L ₁₁ , the vertical movable link L ₁₁ and the vertical movable link L ₁₁ are arranged in parallel with each other, and the height of the vertical portion F ₂ a of the frame F ₂ is increased. The vertical fixed link L ₁₂ lower than the center in the direction and the portions of the parallel arrangement portions 2a, 7a of the middle and lower step plate mounting bodies 2, 7 on the frame F ₂ side are the connecting links L ₁₃ , L. _A total of four links L ₁ , L ₁₂ , L ₁₃ , and L ₁₄ form another parallel link mechanism P ₂ , and the parallel link mechanism P ₂ causes the middle and lower step plates A _{2 to be formed.} , A ₃ is folded to the side of the frame F ₂ .

Further, in the above Examples 1 and 2, both form the upwardly extending portion L ₁ a that extends vertically movable link L ₁ upwards, pipe fitted state to the upwardly extending portion L ₁ a Since the handrail bar H is inserted into the upper extending portion L ₁ a, the handrail rod H can be stably attached to the upper extending portion L ₁ a, and the handrail rod H can be attached to and detached from the upper extending portion L ₁ a. However, the structure for attaching / detaching the handrail bar to / from the upwardly extending portion of the vertically movable link is not limited to the above structure, and may be any structure.

A ₁ to A _3: treadle F _1, F _2: frame F ₁ a, F ₂ a: vertical portion of the frame F ₁ b, F ₂ b: horizontal section of the frame
H: Railing rod L ₁ , L ₁₁ : Vertical movable link
L ₁ a: Vertical extension of vertically movable link L ₂ , L ₁₂ : Vertical fixed link (vertical portion of frame)
L ₃ , L ₄ , L ₁₃ , L ₁₄ : Connection link P ₁ , P ₂ : Parallel link mechanism R ₂ , R ₃ : Topmost connection rivet (connection pin)
S _1, S _2: getting on and off step for track
T: Truck
1, 2: tread mount 1a, 2a: parallel arrangement of tread mount
4, 5: Connection piece
6: Hook
11: Bottom plate of vertically movable link
12: Side plate part of vertically movable link
13: Spacer tube
14: Handrail rod insertion space
51: Floorboard of truck
52: Track tilt plate
53: Gap between the swing plate and the floor plate in the open state
54: Truck bed

Claims (3)

A plurality of upper and lower treads are foldably connected to a rectangular frame via a pair of left and right parallel link mechanisms, and a gap between the floor plate of the truck and the swing plate in the open state is provided in the horizontal part above the frame. A step for a truck with a pair of left and right hooks attached to the
Each of the parallel link mechanisms, each of the vertically movable links arranged in parallel with the vertical portion of the frame, extends above the uppermost step plate, and extends above each of the vertically movable links. A step for getting on and off a truck, characterized in that a handrail bar is detachably attached to each part. The pipe- shaped handrail bar is inserted outside the upper extension of the vertically movable link in an externally fitted state, and the handrail bar is fixed to the upper extension of the vertically movable link via a fixture. The step for getting on and off the truck according to claim 1, wherein the step for getting on and off the truck is performed.   The vertical movable link and each connecting link of each step forming the parallel link mechanism are connected via a connecting pin, and the hand is inserted from the upper end of the upwardly extending portion of the vertical movable link in an externally fitted state. The step of getting on and off the truck according to claim 2, wherein the slide bar is configured to stop moving downward by contacting the uppermost connecting pin.

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