JP5109100B2 - Stepping machine for lorry - Google Patents

Description

  The present invention relates to a step device for a lorry vehicle that is provided below a loading / unloading port of a cargo vehicle to facilitate loading and unloading to the carrier.

  In a lorry, the floor of the loading platform is at a relatively high position, so a step device that forms multiple steps between the loading platform and the ground is installed to raise and lower the loading platform during loading and unloading operations. It is common to make it easier.

  2. Description of the Related Art Conventionally, as this type of step device, one having a structure in which a plurality of step plates is developed stepwise by pulling out horizontally from the under floor of a cargo truck and lowering the leading end side to the ground is known. (For example, refer to Patent Document 1). This includes a pair of main struts and a pair of sub struts extending in parallel to each main strut, and the main struts and sub struts constitute a link mechanism via a step plate. As a result, when the inclination angle of the main column is changed, the sub column and the step column can be displaced in parallel with each other so that the flat column can be folded flatly. It can be stored freely by sliding to the side.

However, in the above conventional step device, the main strut, the sub strut and the step plate are all configured as movable parts, so the number of parts is large and the structure is complicated, and in addition to being relatively expensive, the movable part has The durability is low due to the large number. Further, when the step board is drawn out from under the loading platform floor to form a staircase, the main support column must be pulled out in the horizontal direction, and it is very difficult to pull out the work while the operator holds the load with both hands. Furthermore, when the storage work is under the loading platform floor, it is necessary to perform a two-step operation such as lifting the main column from the ground to a horizontal posture and then sliding it under the loading platform floor. is there. Further, when pulling out the main support column in the horizontal direction, it is necessary to secure a pull-out space behind the operator, so that the pull-out operation in a narrow place becomes difficult.
JP 2001-191853 A

  In view of the above-described points, an object of the present invention is to provide an inexpensive step device for a truck that can be easily and quickly stored and withdrawn below a loading platform, and that is simple in structure and inexpensive.

In order to solve such a problem, the present invention is a step device for a cargo vehicle provided below a loading / unloading port for a cargo vehicle, and is provided below the floor of the cargo platform, at an end of the cargo platform. A support frame formed with an inclined rail inclined in a downward direction toward the lower side, and supported by the support frame so as to be slidable along the inclined rail, and stored under the loading platform floor at the raised position along the inclined rail. A sliding frame that is in a state of being pulled out toward the loading / unloading port at a lowered position along the inclined rail, one or more step plates provided on the sliding frame, and the sliding A locking means for releasably locking the sliding frame to the support frame selectively when the frame is in the stowed position and at the drawer position, and a mechanism for releasing the locking by the locking means Release And a stage.

  According to the present invention, since the slide plate is provided with the step plate and the slide frame is slidably held on the support frame, the link mechanism for flatly folding the step plate as in the conventional step device Compared to the case of having, the number of parts is small, it can be manufactured at low cost, and its durability is also high. Further, the sliding frame can be pulled out below the loading / unloading port of the loading platform only by sliding the sliding frame along the inclined rail of the support frame, and the sliding frame can be used as the inclined rail. It can be stored under the load carrier floor simply by sliding along the upward direction. This eliminates the need for multiple steps such as flat folding and a horizontal posture as in the prior art, and allows quick and easy step board loading and unloading with one behavior. Therefore, the step plate can be taken in and out in a relatively small space. Further, the locking means can securely hold the sliding frame at the storage position by being locked, and the locking means can securely lock and fix the sliding frame at the drawer position. Thus, inadvertent sliding of the sliding frame during loading and unloading work can be reliably prevented.

In the present invention, the sliding frame can be lowered by its own weight along the inclined rail in a state where the locking is released by the locking releasing means, and the supporting frame is configured such that the sliding frame is Tension applying means is provided for applying a predetermined tension to the sliding frame to reduce the descending speed of the sliding frame when the sliding frame descends by its own weight along the inclined rail.

  Since the sliding frame is guided by the inclined rail inclined so as to descend from the storage position toward the pull-out direction, it is lowered in the pull-out direction by its own weight when the locking by the locking means is released at the storage position. Slide. At this time, since sliding of the sliding frame is decelerated by the tension applying means, it is possible to prevent the sliding frame from advancing in the pull-out direction suddenly. Further, the pulling force by the tension applying means is applied to the sliding frame at the drawing position against its own weight. Accordingly, when releasing the locking by the locking means in the pulled-out position and pushing up the sliding frame toward the storage position, the pulling force of the tension applying means acts, and the storage work of the sliding frame is performed lightly and quickly. It can be carried out.

In the first aspect of the present invention, the locking means and the locking release means include a swinging member that is swingably provided on the sliding frame via a pivot, and one end of the swinging member. A locking recess formed on the support frame, a first locking projection provided on the support frame and engaged with the locking recess when the sliding frame is in the storage position, and provided on the support frame. And when the sliding frame is in the drawer position, the second locking projection engages with the locking recess, and the locking recess engages with the first locking projection or the second locking projection. An urging means for urging the oscillating member in a stopping direction; and an urging means connected to the opposite side of the locking recess with respect to the pivot of the oscillating member; Locking the first locking convex portion or the second locking convex portion by the locking recess by swinging the swinging member against this Composed of the pedal is released.

In this aspect, when the sliding frame in the storage position is pulled out, the pedal is depressed and pressed, whereby the swinging member swings through the pivot and the locking recess is engaged with the first locking projection. The stop is released. Thereby, the sliding frame descends along the inclined rail and is pulled out to the pulling position. When the depression of the pedal is released, the swinging member swings in the return direction due to the biasing of the biasing means, and the locking recess becomes the second locking projection when the sliding frame advances to the drawing position. It is locked to. Thus, for example, even if the operator holds the load and both hands cannot be used, the sliding frame can be pulled out simply by depressing the pedal with the operator's foot. The drawing operation can be performed very easily. Even when the sliding frame in the drawer position is stored, the pedal may be depressed to push the sliding frame up toward the storage position.

In the second aspect of the present invention, the locking means and the locking release means are provided on the sliding frame and are movable forward and backward toward the inclined rail of the support frame, and the forward and backward pins are moved in the advance direction. An urging means for urging; a first locking hole portion which is provided in the support frame and engages with the advance / retreat pin when the sliding frame is in the storage position; and provided in the support frame. When the sliding frame is in the pulled-out position, the second locking hole portion with which the advance / retreat pin engages, a wire having one end connected to the advance / retreat pin, and the other end of the wire, Operating means for pulling back the advance / retreat pin against the urging force of the urging means to release the lock of the advance / retreat pin to the first locking hole portion or the second locking hole portion; Consists of .

  In this aspect, when the sliding frame at the storage position is pulled out, the wire pulling operation is performed by the operating means, so that the advance / retreat pin is retracted and the locking to the first locking hole is released. . Thereby, the sliding frame descends along the inclined rail and is pulled out to the pulling position. Then, if the wire pulling state by the operation means is released, the advance / retreat pin advances by the urging force of the urging means, and the advance / retreat pin moves to the second locking hole portion when the slide frame advances to the drawing position. It is locked to. As a result, the operator can pull out the sliding frame with a very simple operation.

  Further, at this time, as a lifting means for pulling up the sliding frame from the drawer position to the storage position along the inclined rail, one end is connected to the sliding frame and extends in the ascending direction of the sliding frame. A hollow string body that is folded back via a pulley and extends outward from the loading / unloading port; and a grip portion that is provided at the other end of the hollow string body and that pulls the hollow string body, It is preferable that the hollow string is inserted into the hollow string body, and the operation means is provided in the grip portion.

  Thus, when the sliding frame in the drawer position is stored in the storage position, the sliding frame is stored by the hollow string folded back through the pulley simply by gripping and pulling the grip portion of the lifting means. Raised towards position. At this time, since the operating means is provided in the gripping portion, the operation means can be operated simultaneously with gripping the gripping portion. It can be performed with one behavior, and the sliding frame can be stored easily and quickly.

[First embodiment]
FIG. 1 is an explanatory view schematically showing the rear part of a truck equipped with a step device of the present invention, FIG. 2 is a plan view showing the step device of the first embodiment, and FIG. 3A is the step device of FIG. 3 (b) is an explanatory view showing a part of FIG. 3 (a) in an enlarged manner, FIG. 4 is a sectional view taken along line IV-IV in FIG. 2, and FIG. 5 (a) is a sectional view of an inclined rail. FIG. 5B is a sectional view showing another shape of the inclined rail, and FIG. 6 is an explanatory view showing the operation of the step device of the first embodiment.

  As schematically shown in FIG. 1, the step device 1 according to the first embodiment is provided below the floor of a container 3 (loading platform) of a lorry 2 and below a loading / unloading port 4 by a rear opening / closing door or the like. It can be pulled out to the position. Reference numeral 5 denotes a rear bumper of the lorry 2, and reference numeral 6 denotes a rear wheel of the lorry 2.

  The step device 1 includes a support frame 7 fixed under the floor of the container 3 and a slide frame 8 supported by the support frame 7 and freely drawable.

  The support frame 7 includes an inclined rail 10 that is fixed below the floor of the container 3 via a connecting member 9 that is partially shown in FIG. 1 and is inclined in a direction that gradually descends toward the end of the loading platform.

  As shown in FIGS. 2 to 4, the sliding frame 8 includes a pair of side plates 11 and two step plates 12 and 13 fixed between the side plates 11. As shown in FIG. 3A, the two step plates 12 and 13 are arranged in a stepwise manner in a horizontal posture at intervals in parallel to each other. As shown in FIG. 2, the sliding frame 8 is provided with a plurality of rollers 14 exposed from both side plates 11 via a bracket 15 so as to be rotatable. As shown in FIG. 5 (a), each roller 14 is held by the inclined rail 10 formed in a U-shape, whereby the sliding frame 8 is moved to the inclined rail 10 as shown in FIG. Are supported by the support frame 7 in a state of being slidable along. In addition, as shown in FIG. 5B, the inclined rail 10 may include a pair of inner side walls 10 a on the upper and lower sides facing the sliding frame 8. According to this, the strength of the inclined rail 10 can be improved and high durability can be obtained.

  As shown in FIG. 3A, the inclined rail 10 includes an upper restricting member 16 that restricts the rise of the roller 14 at the upper end thereof, and a lower restricting member 17 that restricts the lowering of the roller 14 at the lower end thereof. ing. Further, on the outer side of the inclined rail 10, an upper locking pin 18 as a first locking projection and a lower locking pin 19 as a second locking projection protrude from each other at a predetermined distance. ing.

  One side plate 11 of the sliding frame 8 is provided with a swinging member 21 that is swingably supported by a pivot 20. The rocking member 21 has a locking recess 22 formed at one end thereof, and a pedal 23 provided at the other end extending to the opposite side of the locking recess 22 via the pivot 20. The locking recess 22 is formed in a shape that can be locked to both the upper locking pin 18 and the lower locking pin 19, and will be described in detail later. When in the (sliding frame 8 storage position), the locking recess 22 of the swing member 21 can be locked to the upper locking pin 18, and the sliding frame 8 is lowered to the inclined rail 10 (sliding frame 8). ), The locking recess 22 of the swing member 21 can be locked to the lower locking pin 19. And between the pedal 23 and the pivot 20, the rocking member 21 and the side plate 11 are connected, and the tension spring as an urging means for urging the pedal 23 upward (the locking recess 22 side downward). 24 is provided, and the swinging member 21 can be swung against the pulling spring 24 by depressing and pressing the pedal 23. Further, as shown in FIG. 3B, inclined portions 21a and 21b are formed on both sides of the engaging recess 22 of the swing member 21 in the vertical direction. When the upper inclined portion 21a (on the left side in the figure) contacts the upper locking pin 18 when the sliding frame 8 is raised, the swinging member 21 is swung by sliding contact with the upper locking pin 18 to move the upper locking pin 21. The stop pin 18 is guided to the locking recess 22. The lower inclined portion 21b (right side in the figure) makes contact with the lower locking pin 19 when the sliding frame 8 is lowered, thereby swinging the swinging member 21 by sliding contact with the lower locking pin 19 to lower the lower locking pin 19. The locking pin 19 is guided to the locking recess 22. Thus, even if the foot is released from the pedal 23 while the sliding frame 8 is being raised or lowered, the upper locking pin 18 and the lower locking pin 19 are reliably brought into the locking recess 22 by the guides of the inclined portions 21a and 21b. It is designed to be locked. In the first embodiment, the upper locking pin 18, the lower locking pin 19, and the locking recess 22 constitute locking means of the present invention, and the swing member 21 and the pedal 23 are locked according to the present invention. It constitutes a release means.

  As shown in FIGS. 2 and 4, the sliding frame 8 is connected to the support frame 7 via a tension spring 25 as a tension applying means. The tension spring 25 functions to adjust the speed in the raising / lowering operation (in / out operation) of the sliding frame 8. That is, when the sliding frame 8 descends along the inclined rail 10, the sliding frame 8 tries to increase the descending speed by its own weight, but the tension increases as the tension spring 25 is extended, and as a result, the sliding frame 8 increases. The lowering of the moving frame 8 is decelerated. As a result, it is possible to prevent the sliding frame 8 from being rapidly lowered, and it is possible to prevent vibration and damage associated with the collision between the roller 14 and the lower regulating member 17. On the contrary, when the sliding frame 8 is raised along the inclined rail 10, the tension of the tension spring 25 acts to reduce the weight of the sliding frame 8 and to obtain a light raising operation of the sliding frame 8. be able to.

  Next, operation | movement of the step apparatus 1 of 1st Embodiment by the above structure is demonstrated.

  As shown in FIG. 6, the sliding frame 8 is in a state of being stored under the floor of the container 3 when it is in the raised position of the inclined rail 10. At this time, the locking recess 22 of the swing member 21 is locked to the upper locking pin 18, and this locked state is reliably maintained by the biasing of the pull spring 24. This prevents the sliding frame 8 from being inadvertently pulled out while the lorry 2 is traveling. When the sliding frame 8 is pulled out, the pedal 23 is depressed and pressed, and the swinging member 21 is swung against the pulling spring 24. Thereby, the locking to the upper locking pin 18 by the locking recess 22 is released, and at the same time, the sliding frame 8 is lowered along the inclined rail 10 by its own weight. At this time, as described above, the action of the tension spring 25 prevents the sliding frame 8 from being rapidly lowered. When the roller 14 of the sliding frame 8 comes into contact with the lower restricting member 17 and its lowering is stopped, the locking recess 22 faces the lower locking pin 19, and at this time, the depression of the pedal 23 is released. Thus, the locking recess 22 is locked to the lower locking pin 19. As a result, the step plates 12 and 13 of the sliding frame 8 are exposed and fixed below the loading / unloading port 4 and can be brought into a drawn-out state.

  When the sliding frame 8 in the pulled-out state is stored, the pedal 23 is depressed and pressed to release the locking of the locking recess 22 to the lower locking pin 19 by the swinging of the swinging member 21. The sliding frame 8 is pushed up via Also at this time, the sliding frame 8 rises easily by the action of the tension spring 25. Then, the roller 14 of the sliding frame 8 abuts against the upper restricting member 16 and its rise is stopped. In this state, the depression depression of the pedal 23 is released and the locking recess 22 is changed to the upper locking pin 18. Lock. Thereby, the sliding frame 8 is maintained in the stored state at the rising position of the inclined rail 10.

  As described above, according to the step device 1, the sliding frame 8 can be taken in and out by one behavior by depressing the pedal 23. In addition, since the sliding frame 8 simply slides up and down linearly in the oblique direction along the inclined rail 10, the sliding frame 8 can be taken in and out in a relatively narrow space. Further, the step plates 12 and 13 are integrally provided on the sliding frame 8 and have a very simple structure. Therefore, the step plates 12 and 13 can be manufactured at a low cost with a small number of parts and have high durability.

[Second Embodiment]
FIG. 7 is a plan view showing the step device of the second embodiment, FIG. 8 is an explanatory side view of the sliding frame in the second embodiment, and FIG. 9 is a locking means and unlocking in the second embodiment. FIG. 10 is an explanatory view showing the operation of the step device of the second embodiment.

  The step device 26 of the second embodiment is different from the first embodiment in the configuration of the locking means and the locking release means. Therefore, the configuration different from that of the first embodiment will be mainly described, and the same configuration as that of the first embodiment is denoted by the same reference numeral in the drawing and the description thereof is omitted.

  As shown in FIGS. 7 to 9, the step device 26 of the second embodiment includes an advance / retreat pin 28 on a support plate 27 provided at the bottom of the sliding frame 8. One end of a wire 29 is connected to the advance / retreat pin 28, and a handle 30 as an operation means is connected to the other end of the wire 29. The inclined rail 10 is formed with an upper locking hole 31 as a first locking hole and a lower locking hole 32 as a second locking hole with a predetermined distance from each other. .

  As shown in FIG. 9, the advance / retreat pin 28 is held by a fixed case 33 fixed to the support plate 27, and advances / retreats through one side plate 11 of the sliding frame 8. The advancing / retreating pin 28 is urged in the advancing direction by a push spring 34 as an urging means inside the fixed case 33, and the tip of the advancing / retreating pin 28 is in the upper locking hole 31 (or the lower locking hole 32) in the advanced state. Lock. The wire 29 is connected to the rear end of the advance / retreat pin 28, and is connected to the handle 30 through the inside of the outer tube 35 as a hollow string body. One end of the outer tube 35 is connected to the fixed case 33, and the other end is connected to a support member 36 that supports the handle 30 at the lower edge of the loading / unloading port 4 of the container 3. Then, by pulling the handle 30 rearward, the wire 29 guided by the outer tube 35 can retract the advance / retreat pin 28 and release the lock to the upper lock hole 31 (or the lower lock hole 32). It is like that. In the second embodiment, the upper locking hole 31, the lower locking hole 32, and the advance / retreat pin 28 constitute the locking means of the present invention, and the wire 29 and the handle 30 serve as the unlocking means of the present invention. It is composed.

  In the step device 26 configured in this way, as shown in FIG. 10, when the sliding frame 8 is in the raised position of the inclined rail 10 and is housed under the floor of the container 3, the advancing / retreating pin 28. Is locked in the upper locking hole 31, and this locked state is reliably maintained by the urging of the push spring 34 (see FIG. 9). This prevents the sliding frame 8 from being inadvertently pulled out while the lorry 2 is traveling. When the sliding frame 8 is pulled out, the handle 30 is pulled to retract the advance / retreat pin 28 against the push spring 34, so that the locking to the upper locking hole 31 is released. The frame 8 descends along the inclined rail 10 by its own weight. At this time, the sudden lowering of the sliding frame 8 is prevented by the action of the tension spring 25, as in the first embodiment. When the roller 14 of the sliding frame 8 comes into contact with the lower restricting member 17 and its lowering is stopped, the advance / retreat pin 28 faces the lower locking hole 32, and the pulling operation of the handle 30 is released at this position. As a result, the advance / retreat pin 28 advances and engages with the lower engagement hole 32. As a result, the step plates 12 and 13 of the sliding frame 8 are exposed and fixed below the loading / unloading port 4 to be pulled out.

  Further, when storing the sliding frame 8 in the drawn-out state, the handle 30 is pulled to release the locking of the advance / retreat pin 28 to the lower locking hole 32, and the sliding frame 8 is pushed upward obliquely. At this time, the sliding frame 8 may be pushed up by placing a foot on the edge of the lower step plate 13 or pushing the sliding frame 8 by hand. In any operation method, the sliding frame 8 is easily raised by the action of the tension spring 25. When the roller 14 of the sliding frame 8 comes into contact with the upper restricting member 16 and its rise is stopped, if the pulling operation of the handle 30 is released, the advancing / retreating pin 28 moves forward and engages with the upper locking hole 31. Stopped. Thereby, the sliding frame 8 is maintained in the stored state at the rising position of the inclined rail 10.

[Third embodiment]
FIG. 11 is a plan view showing the step device of the third embodiment, FIG. 12 is an explanatory view of the gripping part, and FIGS. 13 and 14 are explanatory views showing the operation of the step device of the third embodiment.

  The step device 37 of the third embodiment is configured by partially using the configuration of the locking means and the locking release means in the second embodiment, and further includes a pulling means 38 described later. In addition, about the component similar to 1st Embodiment or 2nd Embodiment, the same code | symbol is attached | subjected in a figure and the description is abbreviate | omitted.

  As shown in FIG. 11, the lifting means 38 provided in the step device 37 of the third embodiment is configured using the outer tube 35 (hollow string). That is, the outer tube 35 is fixed to the back surface of the back end portion of the step plate 12 positioned at the upper stage of the sliding frame 8 via the fixing member 39. Further, as shown in FIG. 12, the other end of the outer tube 35 is inserted through an insertion hole 41 of a support member 40 fixed to the lower edge of the loading / unloading port 4 of the container 3 and fixed to a handle 42 as a gripping portion. ing. Unlike the handle 30 of the second embodiment, the handle 42 is provided with a lever 43 as an operation means at a gripping position. Further, as shown in FIG. 13, the outer tube 35 extends from the fixing member 39 in the upward direction of the sliding frame 8 and is folded back via a pulley 44 that is rotatably supported under the floor of the container 3. It extends toward the support member 40 on the handle 42 side.

  According to this configuration, the lever 43 is pulled by gripping the handle 42, and the wire 29 is pulled along with this, so that the advance / retreat pin 28 moves backward. When the slide frame 8 in the drawn-out state is stored, the handle 42 is gripped and the lever 43 is operated to release the locking of the advance / retreat pin 28 to the lower locking hole 32. Next, as shown in FIG. 14, by pulling the handle 42 backward, a pulling force is applied to the sliding frame 8 via the pulley 44, and the sliding frame 8 in the drawn state is raised along the inclined rail 10. be able to. At this time, as described above, the sliding frame 8 is easily raised by the action of the tension spring 25. When the roller 14 of the sliding frame 8 comes into contact with the upper restricting member 16 and its rise is stopped, if the pulling operation of the handle 42 and the gripping of the lever 43 are released, the advance / retreat pin 28 advances and the upper engagement member 28 Locked to the stop hole 31. Thereby, the sliding frame 8 is maintained in the stored state at the rising position of the inclined rail 10. Here, when the sliding frame 8 is in the retracted state, the outer tube 35 is pulled out. For example, the drawn outer tube 35 is made to follow the lower edge of the container 3, and the handle 42 is illustrated. It is preferable to be hooked on a hook or the like that is not.

  Further, when the sliding frame 8 is pulled out, the handle 42 is gripped and the lever 43 is operated, and the advance / retreat pin 28 is retracted, so that the locking to the upper locking hole 31 is released. The frame 8 descends along the inclined rail 10 by its own weight. At this time, as described above, the action of the tension spring 25 prevents the sliding frame 8 from being rapidly lowered. Then, the handle 42 is returned following the lowering of the sliding frame 8, and the gripping of the handle 42 is only released when the roller 14 of the sliding frame 8 contacts the lower regulating member 17 and the lowering is stopped. Thus, the operation of the wire 29 by the lever 43 is released, and the advance / retreat pin 28 advances and engages with the lower engagement hole 32. As a result, the step plates 12 and 13 of the sliding frame 8 are exposed and fixed below the loading / unloading port 4 to be in the drawn-out state shown in FIG.

  In the above embodiment, the sliding frame 8 provided with the two step plates 12 and 13 is shown. However, the number of the step plates is not limited to this, and the distance from the ground to the loading / unloading port 4 is shown. It can be increased or decreased accordingly. Further, in each of the above embodiments, the tension spring 25 is employed as the tension applying means. However, instead of this, for example, an air cylinder or the like may be used, although not shown.

Explanatory drawing which shows typically the rear part of the lorry which attached the step apparatus of this invention. The top view which shows the step apparatus of 1st Embodiment. (A) is a side view of the step device of FIG. 2, (b) is an explanatory view showing an enlarged part of (a). FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. (A) is sectional drawing of an inclination rail, (b) is sectional drawing which shows the other shape of an inclination rail. Explanatory drawing which shows the action | operation of the step apparatus of 1st Embodiment. The top view which shows the step apparatus of 2nd Embodiment. The explanatory side view of the sliding frame in a 2nd embodiment. Explanatory drawing which shows the structure of the latching means and the latch release means in 2nd Embodiment. Explanatory drawing which shows the action | operation of the step apparatus of 2nd Embodiment. The top view which shows the step apparatus of 3rd Embodiment. Explanatory drawing of a holding part. Explanatory drawing which shows the time of drawer | drawing-out of the step apparatus of 3rd Embodiment. Explanatory drawing which shows the time of accommodation of the step apparatus of 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,26,37 ... Step apparatus, 2 ... Lorry car, 3 ... Container (loading platform), 4 ... Loading / unloading port, 7 ... Support frame, 8 ... Sliding frame, 10 ... Inclined rail, 12, 13 ... Step board, 18 ... Upper locking pin (first locking projection), 19 ... Lower locking pin (second locking projection), 20 ... Pivot, 21 ... Swing member, 22 ... Locking recess, 23 ... Pedal, 24 ... tension spring (biasing means), 25 ... tension spring (tension applying means), 28 ... advance / retreat pin, 29 ... wire, 30 ... handle (operating means), 31 ... upper locking hole (first locking hole) ), 32... Lower locking hole (second locking hole), 34... Press spring (biasing means), 35. Outer tube (hollow string), 38. Lifting means, 42. 43 ... Lever (operating means), 44 ... pulley.

Claims (3)

A step device for a lorry car provided below a loading / unloading port of a cargo truck.
A support frame (7) provided with an inclined rail (10) which is provided under the floor of the loading platform (3) and which is inclined in a direction gradually descending toward the end of the loading platform;
The support frame (7) is slidably supported along the inclined rail (10), and is housed under the load carrier floor at an elevated position along the inclined rail (10). The inclined rail (10) A sliding frame (8) that is pulled out outward from the loading / unloading port (4) at a lowered position along
One or more step plates (12, 13) provided on the sliding frame (8);
A locking means for releasably locking the sliding frame (8) to the support frame (7) selectively when the sliding frame (8) is in the retracted position and when in the drawer position; ,
An unlocking means for releasing the locking by the locking means ,
The sliding frame (8) can be lowered by its own weight along the inclined rail (10) in a state where the locking is released by the locking release means,
The support frame (7) applies a predetermined tension to the sliding frame (8) when the sliding frame (8) is lowered by its own weight along the inclined rail (10). Comprising tension applying means (25) for reducing the descending speed of (8),
The locking means and the unlocking means are:
A swinging member (21) provided on the sliding frame (8) so as to be swingable via a pivot (20);
A locking recess (22) formed at one end of the swing member (21);
A first locking projection (18) that is provided on the support frame (7) and engages the locking recess (22) when the sliding frame (8) is in the storage position;
A second locking projection (19) that is provided on the support frame (7) and engages with the locking recess (22) when the sliding frame (8) is in the extended position;
Biasing means (24) for biasing the swinging member (21) in a direction in which the locking recess (22) is locked to the first locking projection (18) or the second locking projection (19). When,
The swinging member (21) is connected to the opposite side of the locking recess (22) with respect to the pivot (20), and the swinging member (21) resists the urging by the urging means (24) by a foot press. A pedal (23) that swings the moving member (21) to release the locking of the first locking projection (18) or the second locking projection (19) by the locking recess (22). A step device for a truck. A step device for a lorry car provided below a loading / unloading port of a cargo truck.
A support frame (7) provided with an inclined rail (10) which is provided under the floor of the loading platform (3) and which is inclined in a direction gradually descending toward the end of the loading platform;
The support frame (7) is slidably supported along the inclined rail (10), and is housed under the load carrier floor at an elevated position along the inclined rail (10). The inclined rail (10) A sliding frame (8) that is pulled out outward from the loading / unloading port (4) at a lowered position along
One or more step plates (12, 13) provided on the sliding frame (8);
A locking means for releasably locking the sliding frame (8) to the support frame (7) selectively when the sliding frame (8) is in the retracted position and when in the drawer position; ,
An unlocking means for releasing the locking by the locking means,
The sliding frame (8) can be lowered by its own weight along the inclined rail (10) in a state where the locking is released by the locking release means,
The support frame (7) applies a predetermined tension to the sliding frame (8) when the sliding frame (8) is lowered by its own weight along the inclined rail (10). Comprising tension applying means (25) for reducing the descending speed of (8) ,
The locking means and the unlocking means are:
An advancing / retreating pin (28) provided on the sliding frame (8) and capable of advancing and retracting toward the inclined rail (10) of the support frame (7);
Biasing means (34) for biasing the advance / retreat pin (28) in the advance direction;
A first locking hole (31) provided on the support frame (7) and engaged with the advance / retreat pin (28) when the sliding frame (8) is in the storage position;
A second locking hole (32) that engages with the advance / retreat pin (28) when the sliding frame (8) is in the extended position, provided on the support frame (7);
A wire (29) having one end connected to the advance / retreat pin (28);
Connected to the other end of the wire (29), pulling the wire (29) to retract the advance / retreat pin (28) against the urging force of the urging means (34). The operation step (30) for releasing the engagement of the (28) with the first locking hole (31) or the second locking hole (32) is a step for a truck. apparatus. As lifting means (38) for pulling up the sliding frame (8) along the inclined rail (10) from the drawer position to the storage position,
One end is connected to the sliding frame (8) and extends in the upward direction of the sliding frame (8). Further, the sliding frame (8) is folded back through the pulley (44) and extends outward from the loading / unloading port (4). A hollow string (35);
A grip portion (42) provided on the other end of the hollow cord body (35) for pulling the hollow cord body (35);
The step device for a lorry according to claim 2, wherein the wire (29) is inserted into the hollow string body (35), and the operating means (30) is provided in the grip portion (42). .

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