JP3521536B2 - Roll stopper open / close holding mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for holding an open / closed state of a roll stopper provided on a tail lift of a carrier.

[0002]

2. Description of the Related Art Conventionally, in various relatively large-sized transport vehicles, the side wall and the back side of the loading platform are constituted by an opening / closing member which can be opened and closed, and the opening / closing member is opened and closed to load the luggage on the loading platform. It is designed to carry in and out. 11 to 13 show a tail lift provided on the back surface of a carrier, which is an example of a conventional opening / closing member of this type,
In the figure, reference numeral 1 is a ground plate (opening / closing member) which constitutes the openable / closable outer wall of the back surface. The ground plate 1 is a member having a double structure having an outer wall plate 2 and an inner wall plate 3 both made of aluminum. It is mounted freely and vertically. As shown in FIG. 11, when the ground plate 1 is opened by the links 4 and the hydraulic cylinders 5, the inner wall plate 3 serves as a loading / unloading path for luggage. For example, the open state shown in FIG. When carrying the above-mentioned luggage into the loading platform from the ground, the above-mentioned luggage is usually placed in a bucket with casters or on the loading platform, and once loaded from the ground, the ground plate 1
After being placed on the inner wall plate 3 of the above, the link 4 and the hydraulic cylinder 5 are operated as they are to operate the ground plate 1
Is moved up to the same level as the loading platform, and then the load is moved from above the ground plate 1 into the loading platform, and then the ground plate 1 is rotated to close the back surface of the loading platform.

By the way, when the load is carried in on the loading platform through the ground plate 1 in this manner, the ground is provided so that the caster carrying the load can smoothly move from the ground to the ground plate 1. The plate 1 is provided so that the tip 1b side thereof inclines slightly downward in the open state, so that the ground plate 1 itself is lifted together with the load, especially after the load is moved from the ground onto the ground plate 1. When this is done, there is a risk that the casters will move along the slope of the ground plate 1 and slip off from the tip 1b thereof. For this reason, in a tail lift of this type, a roll stopper 6 for locking the movement of the casters and preventing the casters from sliding down is provided on the side of the tip portion 1b of the inner wall plate 3 of the ground plate 1.
Is provided.

12 and 13 show the structure of the roll stopper 6, and reference numeral 7 in the drawings denotes a flap (plate member) 7 of the roll stopper 6. The flap 7 is a strip-shaped member having the same shape as the elongated rectangular opening 3a formed in the width direction on the tip side of the inner wall plate 3 of the ground plate 1, and is provided at a predetermined position (two positions in the figure) on the back surface thereof. Is
An L-shaped rotating metal fitting 8 having a short side hanging downward is fixed. On the other hand, a similar L-shaped fixing metal fitting 9 is fixed on the outer wall plate 2 of the ground plate 1 facing the rotating metal fitting 8, and the short side portions of the rotating metal fitting 8 and the fixing metal fitting 9 are fixed. The flap 7 is openably and closably provided in the opening 3a of the inner wall plate 3 by inserting the pin 10 therebetween. On the outer periphery of the pin 10, a spring (urging means) (not shown) which is interposed between the rotating metal fitting 8 and the fixed metal fitting 9 and biases the flap 7 in the opening direction is attached. A flap stopper 11 for pressing the upper surface of the flap 7 and holding it in a closed state is provided on the upper surface of the inner wall plate 3 located on one end side of the flap 7 so as to be rotatable around a shaft 12. There is. A locking plate 7a is integrally formed at the open end of the flap 7 located on the base end 1a side of the ground plate 1 to prevent the caster from sliding down when the flap 7 is open. Has been done.

In the roll stopper 6 having the above structure, the flap stopper 11 serving as the open / close holding mechanism is used, and when the flap 7 is not used during traveling, the flap 7 is first resisted against the biasing force of the spring. Is closed to the opening 3a side and the flap stopper 11 is rotated to lock the upper surface of the flap 7 to hold the flap 7 in the closed state. Further, as shown in FIG. 11, when the flap 7 is desired to be used when carrying in luggage, etc., the flap stopper 11 is rotated to release the engagement with the upper surface of the flap 7, so that the biasing force of the spring is applied. The flap 7 is opened. As a result, when the caster on the inner wall plate 3 of the ground plate 1 slides toward the tip side 1b along the inclination of the ground plate 1, its movement is locked by the locking plate 7a of the flap 7. Sliding from the ground plate 1 is prevented. On the contrary, when the ground load is carried on the ground plate with the flap 7 open, if the caster carrying the load is moved as it is onto the inner wall plate 3 and passed over the flap 7. The flap 7 is once closed by the weight of the load larger than the urging force of the spring, and after the caster has passed, the flap 7 is returned to the open state by the urging force of the spring and the tip side 1a of the caster.
Is prevented from sliding down.

[0006]

However, in the above-described open / close holding mechanism for the roll stopper 6, the flap 7 is held open only by the biasing force of the spring when the flap 7 is open. Therefore, after the caster loaded with luggage is passed over the flap 7 and placed on the inner wall plate 3 of the ground plate 1,
For example, when an operator accidentally steps on the flap 7 with his / her foot, the flap 7 is easily closed, and as a result, the casters on the ground plate 1 pass again on the closed flap 7 along the slope. There was a problem that it would slip off from the tip 1b side.

The present invention has been made in order to effectively solve the problems of the conventional opening / closing mechanism for a roll stopper, and a plate-shaped member for opening / closing the roll stopper is provided.
An object of the present invention is to provide an open / close holding mechanism for a roll stopper that can switch and hold not only the closed state and the opened state by only the biasing means, but also the state fixed to the open position.

[0008]

An open / close mechanism for a roll stopper according to the present invention as set forth in claim 1 has at least an outer wall plate and an inner wall plate on the side of the open / close member constituting the open / close portion of the outer wall of the cargo bed. A rod provided so as to be retractable toward the plate-shaped member side of a roll stopper provided at an opening formed in the inner wall plate so as to be openable and closable, and an operating means for retracting and retracting the rod toward the plate-shaped member And a first engaging portion that is engageable with the rod at the open position of the plate-shaped member and is engaged with the rod at the closed position of the plate-shaped member on the roll stopper side. And a rod receiving member having a second engaging portion for holding.

The invention described in claim 2 is the same as claim 1.
In the invention described in (1) above, the rod has a non-circular tip portion and is provided on the back surface side of the inner wall plate of the opening / closing member so as to be retractable toward the opening and rotatable about its axis. While using a rod-shaped member, the operating means urges the rod in one direction of the projecting / retracting direction, an operating knob projecting on the outer periphery of the rod, and an inner wall plate of the opening / closing member. And the operation knob is inserted therethrough, and the rod is projected to fit the first engaging portion and the rod is rotated relative to the first position so as to project. The rod has a switching groove that guides and locks the operation knob at a second position where the rod engages with the second engaging portion and a third position where the rod retracts from the rod receiving member. The first engaging portion of the receiving member is at the first position A second hole having a shape in which the tip of the rod is fittable, and the second engaging portion has a shape in which the tip of the rod at the second position is fittable. It is characterized by being a hole.

Further, according to the invention described in claim 3, the urging member according to claim 2 urges the rod in a direction in which the rod is projected toward the plate-shaped member, and at the same time, on the upper surface of the tip of the rod, An inclined surface is formed so as to incline downward gradually toward the tip portion, and the lower surface of the rod receiving member that abuts this inclined surface is for inclining upward gradually toward the rod side to guide the rod. The inclined surface of is formed.

The invention described in claim 4 is the same as claim 1.
In the invention described in (1), a large diameter portion and a small diameter portion are formed in the axial direction as the rod, and the rod can be retracted toward the opening on the back surface side of the inner wall plate of the opening / closing member and rotatable about the axis thereof. While using the provided columnar member, the rod receiving member engages with the large diameter hole portion that fits with the large diameter portion of the rod in the closed state of the plate member, and the large diameter portion and the small diameter portion of the rod. A non-engaging portion that does not fit, and a locking portion that is locked by the large-diameter portion of the rod for movement in the closing direction when the plate-shaped member is in an open state, and the operating means is for retracting the rod A biasing member that biases in one direction,
A first knob in which a large-diameter portion of the rod is fitted into the large-diameter hole portion while the operation knob protruding from the outer periphery of the rod and the operation knob inserted through the inner wall plate of the opening / closing member are inserted.
Position, a second position where the large diameter portion of the rod is located in the non-engaging portion, and a third position where the large diameter portion of the rod is located in the locking portion. And a switching groove that is locked.

Further, in the invention according to claim 5, the rod according to claim 4 is provided with the large diameter portion at the tip thereof, and the rod receiving member extends in the rod advancing direction. The locking portion, the non-engaging portion, and the large-diameter hole portion are sequentially arranged, and the small-diameter portion of the rod can be inserted into the locking portion while the plate-shaped member is closed, and the large-diameter portion is large. A groove portion is formed so that the diameter portion cannot be inserted therethrough, and a wide portion is formed on the opening side of the groove portion, through which the large diameter portion of the rod can be inserted when the plate member is in the open state. It is characterized by.

According to a sixth aspect of the invention, there is provided the invention according to any one of the first to fifth aspects, wherein the opening / closing member is a ground plate of a tail lift of a transport vehicle, and the plate-shaped member is This is applied to a roll stopper flap provided on the ground plate.

[0014]

In the invention according to any one of claims 1 to 5, the first engaging member of the rod receiving member provided on the roll stopper side is configured such that the rod is projected and retracted toward the plate member by the operating means. The plate-like member is fixed to the open position by engaging the mating portion. Further, by disengaging the rod from the first engaging portion, the plate-shaped member is held in an open state only by the biasing means. Further, by engaging the rod with the second engaging portion, the plate member is fixed in the closed position. Therefore, according to the open / close holding mechanism for the roll stopper, the rod is appropriately engaged with the first engaging portion or the second engaging portion, or is not engaged with the first and second engaging portions. This makes it possible to fix the plate-like member in the closed state or the open state, and hold it in the open state only by the urging force of the urging means, which is suitable for loading and unloading of luggage. It is possible to freely switch to the position of.

By the way, according to the invention of claim 2 which is one embodiment of the invention of claim 1, when the plate member is closed from the open state, the operation knob is provided with the switching groove. The closed state of the plate member is maintained by guiding the rod to the second position and fitting the rod into the second hole. Further, when the operation knob of the rod is moved from the second position and locked at the third position, the tip of the rod is disengaged from the second hole of the rod receiving member and the plate member is urged. The open state is maintained only by the biasing force of the means. Then, the operation knob is removed from the third position, and the first
When the rod is locked at the position, the rod also rotates around its axis along with the rotation of the operation knob, and changes to a position that matches the shape of the first hole, so that the tip of the rod moves to the first position. The plate-like member is fixed in the open state by fitting into the hole portion.

In this case, according to the third aspect of the present invention, since the inclined surface is formed at the tip of the rod and the lower surface of the rod receiving member which abuts against this is also formed, the inclined surface is formed.
When closing the plate-shaped member from the state in which the plate-shaped member is opened only by the biasing force of the biasing means, the plate-shaped member is simply pushed down from the state in which the operation knob is locked at the second position, so that the rod can be easily pushed. The plate-shaped member can be fixed in the closed state by fitting the tip end portion into the second hole portion of the rod receiving member.

Further, in the invention according to claim 4 or 5 which is another embodiment of claim 1, when the plate member is first held in a closed state, the plate member is closed and By locking the operation knob at the first position of the switching groove, the large diameter portion of the rod is fitted into the large diameter hole portion of the rod receiving member. As a result, the closed state of the plate member is maintained. When the plate member is opened from the closed state, the operation knob of the rod is moved to the second position of the switching groove.
Switch to the position. Then, the large-diameter portion of the rod separates from the large-diameter hole portion and is positioned at the non-engaging portion of the rod receiving member, so that the plate member is opened by the urging force of the urging means.

In this state, since the groove portion of the engaging portion of the rod receiving member in which the small diameter portion of the rod is located is open downward, the plate member is opened by the urging force of the urging means and the load is carried in. When the caster passes over the plate-shaped member when it is moved, the caster is freely closed by the load. Therefore,
In order to fix the plate-like member in the open state after the load has passed, the operation knob is locked at the third position of the switching groove, so that the large diameter portion of the rod is locked by the locking portion of the rod receiving member. Position it in the widened part. Then, even if the plate member is closed, the large diameter portion is locked by the step portion between the widening portion and the groove portion and is prevented from moving downward, so that the plate member is fixed in the open state. It

As described above, the invention according to any one of claims 1 to 5 is suitable when it is used as an opening / closing mechanism for a flap of a roll stopper provided on the rear surface of a ground plate of a tail lift of a transport vehicle. is there.

[0020]

Embodiment 1 FIGS. 1 to 4 show a first embodiment of a roll stopper opening / closing mechanism according to the present invention.
The same components as those shown in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. Note that in FIG. 1, in order to clearly show the configuration of the opening / closing holding mechanism, the end portion of the flap 7 is drawn slightly displaced from the original position in the direction away from the inner wall plate 3. 1 to 4, in this roll stopper open / close holding mechanism, a leaf spring for urging the flap 7 in the opening direction is placed at a predetermined position between the outer wall plate 2 of the ground plate 1 and the flap 7. Urging means) 15
And the flap 7 has the opening 3a.
It is provided rotatably around a shaft 16 provided on the tip portion 1b side of the ground plate 1 inside. And
A cylindrical rod 20 is provided on the back surface side of the inner wall plate 3 of the ground plate 1 located on one end side of the flap 7 so as to be retractable and rotatable toward the flap 7 side.
And the rod 2 provided on the proximal end side of the rod 20.
A spring (biasing member) 21 that urges 0 toward the flap 7 side and an operation knob 22 that is attached to the outer periphery of the rod 20 and projects radially from this are provided. Further, the inner wall plate 3 where the operation knob 22 is located is formed with a switching groove 23 through which the operation knob 22 is inserted on the upper surface side of the inner wall plate 3. This switching groove 23
Is a first position 23 that guides the operation knob 22 to project the rod 22 to a position below the end of the flap 7.
a and the rod 22 for this first position 32a
In order to hold the rod 22 at a second position 23b where it is rotated to project to the position below the end and a third position 23c where the rod 22 is retracted from the end of the flap 7, a substantially E-shaped appearance is provided. Has been drilled.

A key 24 is fitted to the tip of the rod 20 so that the tip is formed in a non-circular shape. The spring 21, the operating knob 22, and the switching groove 23 constitute an operating means for the rod 20. On the other hand, a rod receiving member 25 is fixed to the back surface of the end of the flap 7 facing the tip of the rod 20. The rod receiving member 25 is a block-shaped member that hangs downward from the flap 7, and has a first hole portion (first engaging portion) 26 that is circular in the up-down direction on the surface facing the rod 20. And a second hole portion (engagement portion) 27 are formed. The first hole portion 26
Is formed at a position corresponding to the rod 20 in the opened state of the flap 7, and is at the first position 23a.
A key groove 26a is formed at a position where the key 24 is fitted to the tip end portion of the rod 22 in FIG. In addition, the second hole 2
7 is provided at a position corresponding to the rod 20 in the closed state of the flap 7, and the second position 23 is provided.
A key groove 27a is formed at a position corresponding to the position of the key 24 when the rod 20 is rotated up to b. That is, the first and second hole portions 26 and 27 are formed on the same rotation track around the shaft 16 around which the flap 7 rotates.

Further, as shown in FIG. 4, an inclined surface 20a is formed on the upper surface of the tip portion of the rod 20 so as to gradually incline downward toward the tip, while the inclined surface 20 is formed.
An inclined surface 25a for guiding the rod 20 is formed on the lower surface of the rod receiving member 25 that comes into contact with a and is gradually inclined upward toward the rod 20 side.

Next, the operation of holding the flap 7 in the open / closed state by using the roll stopper open / close holding mechanism having the above construction will be described. First, when the flap 7 shown in FIGS. 3 and 4 is closed from the open state, the operating knob 22 is guided to the second position 23b of the switching groove 23 and the rod 20 is projected, The flap 7 is closed against the spring 15 toward the opening 3a. Then, the inclined surface 25a of the rod receiving member 25 on the lower surface of the flap 7 comes into contact with the inclined surface 20a of the rod 20, and the flap 7 is further pushed down, whereby the rod 20 retreats against the urging force of the spring 21 and then the rod 20. Of the rod receiving member 25 relatively rises along the facing surface of the rod receiving member 25. The tip of the rod 20 first reaches the position of the first hole 26, but the key 24 position of the rod 20 at the second position 23b does not match the key groove 26a position of the first hole 26. In addition, the rod 20 passes through the first hole 26 without being fitted, and then fits into the hole 27 when the rod 20 matches the second hole 27. As a result, the closed state of the flap 7 is maintained.

Then, when the flap 7 shown in FIGS. 1 and 2 is opened from the closed state, the rod 20
Of the operating knob 22 of the third position by retracting it from the second position 23b.
Is locked at the position 23c. Then, the tip of the rod 20 separates from the second hole 27 of the rod receiving member 25, so that the flap 7 is opened by the urging force of the leaf spring 15, as shown in FIG. By the way, in this state, since the flap 7 is opened only by the leaf spring 15,
Caster C is ground plate 1 when carrying in luggage
When it passes over the flap 7 from the tip 1b side of the, it is freely closed by the load.

Therefore, in order to fix the flap 7 in the open state after the load has passed, the operation knob 22 is disengaged from the third position 23c and locked at the first position 23a. Then, as the operation knob 22 rotates,
Since the key 24 together with the rod 20 also rotates to a position that coincides with the key groove 26a of the first hole 26, the tip of the rod 20 fits into the first hole 26 and the flap 7
Is fixed in the open state. As a result, the ground plate 1
The caster C on the inner wall plate 3 of the
The sliding is prevented by a, and even if an operator steps on the flap 7 with his / her foot, the flap 7 will not be closed.

As described above, according to the open / close holding mechanism for the roll stopper, the operating knob 22 is appropriately locked to any one of the first position 23a to the third position 23c of the switching groove 23, and the rod 20 is locked. First hole 2 of rod receiving member 22
6 or the second hole 27, or by not fitting them, the flap 7 can be fixed in the closed state or the open state, and the urging force of the leaf spring 15 can be fixed. It is possible to freely switch to the optimum position according to the loading and unloading of luggage, such as holding it in the open state only by using. Particularly, the inclined surface 20a is formed at the tip of the rod 20, and the rod receiving member 25 is in contact with this.
Since the inclined surface 25a is also formed on the lower surface of the flap 7, when the flap 7 is closed only from the biasing force of the leaf spring 15, the operation knob 22 is locked at the second position 23b. By simply pushing down the flap 7 from the state, the tip end portion of the rod 20 can be easily attached to the rod receiving member 25.
The flap 7 can be fixed in the closed state by fitting the flap 7 into the second hole portion 27 of FIG.

[0027]

[Embodiment 2] FIGS. 5 to 10 show a second embodiment of the opening / closing mechanism for a roll stopper according to the present invention.
The same components as those shown in FIGS. 11 to 13 are designated by the same reference numerals and the description thereof will be omitted. 5, in order to clearly show the configuration of the open / close holding mechanism, as in FIG. 1, the end of the flap 7 is slightly displaced from the original position in the direction away from the inner wall plate 3. It is drawn. 5 to 10, in the open / close holding mechanism of this example, a cylindrical rod 30 is provided on the back surface side of the inner wall plate 3 so as to be retractable and rotatable about the axis. The rod 30 has a large-diameter portion 30a formed at the tip end in the axial direction, and a small-diameter portion 30b formed at the base end side of the large-diameter portion 30a.

On the other hand, a rod receiving member 31 is fixed to the lower surface of the flap 7 facing the protruding / retracting direction of the rod 30. Here, the rod receiving member 31 has a U-shaped appearance in which an engaging portion 32, a non-engaging portion 33, and a large-diameter hole portion 34 are sequentially arranged along the approaching direction of the rod 30. A small diameter portion 30b of the rod 30 can be inserted into the locking portion 32 when the flap 7 is closed,
Further, a groove portion 35 that opens downward is formed. Then, on the lower side of the groove 35, as shown in FIGS. 5 and 8, the rod 3 is provided only when the flap 7 is open.
A widened portion 36 through which the large diameter portion 30a of 0 can be inserted is formed. Further, as shown in FIG. 6, the large-diameter hole portion 34 is formed at a position where the large-diameter portion 30a of the rod 30 can be fitted with the flap 7 in the closed state. The non-engaging portion 33, which is a missing portion that does not engage with the rod 30 when the flap 7 is opened or closed, is formed between the large-diameter hole portion 34 and the locking portion 32. .

Further, on the inner wall plate 3 above the rod 30,
While the operation knob 37 of this rod 30 is inserted,
The first position 3 in which the large-diameter portion 30a of the rod 30 is fitted into the large-diameter hole portion 34 of the rod receiving member 31 in the operation knob 37.
8a, a second position 38b where the large diameter portion 30a is located in the non-engaging portion 33, and a third position 38c where the large diameter portion 30a is located in the locking portion 32. A switching groove 38 for stopping is formed. The spring 21, the operating knob 37, and the switching groove 38 constitute an operating means for the rod 30.

Next, the operation of holding the flap 7 in the open / closed state by using the roll stopper open / close holding mechanism having the above-described structure will be described. First, when the flap 7 is held in the closed state, as shown in FIG. 6, the flap 7 is closed and the operation knob 37 is moved to the switching groove 38.
Of the rod 3 by locking it in the first position 38a of
The large diameter portion 30a of 0 to the large diameter hole portion 34 of the rod receiving member 31.
To fit. As a result, the closed state of the flap 7 is maintained. Then, when the flap 7 shown in FIG. 6 is opened from the closed state, the operation knob 37 of the rod 30 is opened.
To the second position 38b of the switching groove 38. Then, the large-diameter portion 30a of the rod 30 is disengaged from the large-diameter hole portion 34, and is positioned at the non-engaging portion 33 of the rod receiving member 31, as shown in FIG. It is opened by the urging force of. In this state,
As shown in FIG. 7, since the groove portion 35 of the locking portion 32 of the rod receiving member 31 in which the small diameter portion 30b of the rod 30 is located is opened downward, as shown by the two-dot chain line in FIG. The leaf spring 15 is opened by the urging force of the leaf spring 15, and when the caster passes over the flap 7 when carrying in a load, the caster is freely closed by its load.

Next, in order to fix the flap 7 in the open state after the baggage has passed, the operation knob 37 is locked at the third position 38c of the switching groove 38, as shown in FIG.
As shown in 0, the large diameter portion 30a of the rod 30 is positioned in the widened portion 36 of the locking portion 32 of the rod receiving member 31. Then, as shown in FIG. 8, the large-diameter portion 30a can be inserted into the widening portion 36 of the locking portion 32, but cannot be inserted into the narrow groove portion 35 above the widening portion 36. Even if the flap 7 is closed, the large diameter portion 30a
Is locked to the step portion between the widened portion 36 and the groove portion 35, and is prevented from moving downward. As a result, the flap 7 is fixed in the open state, and the caster on the inner wall plate 3 of the ground plate 1 is prevented from slipping down by the locking plate 7a of the flap 7, and the operator temporarily puts the flap 7 on his / her feet.
The flap 7 will not close even when the user steps on.

As described above, also by the open / close holding mechanism of the roll stopper of this example, the operation knob 37 is appropriately locked to any one of the first position 38a to the third position 38c of the switching groove 38 to make the rod. By positioning 30 in the large-diameter hole portion 34, the non-engagement portion 33, or the locking portion 32 of the rod receiving member 31, the flap 7 is fixed in the closed state as in the case of the first embodiment. It is possible to freely switch to an optimum position according to loading and unloading of luggage, such as opening, fixing in an open state, and holding in an open state only by the biasing force of the leaf spring 15.

In each of the first and second embodiments described above, only the example in which the open / close holding mechanism for the roll stopper according to the present invention is applied to the roll stopper provided on the rear surface of the tail lift has been described. The present invention is not limited to this, and is rotatably attached to the loading platform of various transport vehicles to form the opening / closing portion on the back side or the side of the loading platform,
The same can be applied to various roll stoppers provided on the opening / closing member such that the inner wall plate serves as a loading / unloading path for the load in the open state.

[0034]

As described in detail above, the first to third aspects are described.
According to the roll stopper open / close holding mechanism according to the present invention described in any one of 5, the rod is appropriately engaged with the first engaging portion or the second engaging portion, or these first and second engaging portions are engaged. By not engaging with the engaging portion of the above, the above-mentioned plate-like member is fixed in the closed state or fixed in the open state, and further held in the open state only by the urging force of the urging means. It is possible to freely switch to the optimum position according to the loading and unloading of. Particularly, in the invention described in claim 3, since the inclined surface is formed at the tip portion of the rod described in claim 2, and the inclined surface is also formed on the lower surface of the rod receiving member that abuts against the inclined surface. When closing the plate-shaped member from the state in which the plate-shaped member is opened only by the urging force of the urging means, the plate-shaped member is simply pushed down from the state in which the operation knob is locked at the second position, so that the rod is easily pushed. There is an effect that the tip end of the plate member can be fitted into the second hole of the rod receiving member to fix the plate member in the closed state. Therefore, the invention according to any one of claims 1 to 5 is particularly suitable when used as an opening / closing mechanism for a flap of a roll stopper provided on the back surface of a ground plate of a tail lift of a transport vehicle.

[Brief description of drawings]

FIG. 1 is a first opening / closing mechanism for a roll stopper according to the present invention.
It is a perspective view of the important section showing an example.

FIG. 2 is a side sectional view of the flap of FIG. 1 in a closed state.

FIG. 3 is a side sectional view of the flap shown in FIG. 1 in an opened state.

FIG. 4 is a front view showing a positional relationship between the rod and the rod receiving member of FIG.

FIG. 5 is a second opening / closing mechanism for a roll stopper according to the present invention.
It is a perspective view of the important section showing an example.

6 is a front view showing a cross-sectional view of a main part showing a rod position when the flap of FIG. 5 is held in a closed state.

7 is a sectional view taken along line VII-VII in FIG.

8 is a cross-sectional view showing the rod position when the flap of FIG. 7 is held in an open state.

9 is a front view showing a cross-sectional view of a main part showing a rod position when the flap of FIG. 5 is opened and closed.

10 is a front view showing a cross-section of a main part showing a rod position when the flap of FIG. 5 is held in an open state.

FIG. 11 is a perspective view showing a main part of a tail lift of a general carrier.

FIG. 12 is a plan view showing a conventional roll stopper.

13 is a sectional view taken along line XIII-XIII in FIG.

[Explanation of symbols]

1 Ground plate (opening / closing member) 1a base end 1b Tip 2 outer wall boards 3 inner wall plate 3a opening 6 roll stopper 7 flaps (plate members) 15 Leaf spring (biasing means) 20, 30 rod 21 Spring (biasing member) 22, 37 Operation knob 23, 38 Switching groove 23a First position (open hold) 23b Second position (closed hold) 23c Third position 24 keys 25, 31 Rod receiving member 26 First Hole (First Engagement) 27 Second hole (second engaging portion) 20a, 25a inclined surface 30a large diameter part 30b small diameter part 32 Locking part (first engaging part) 33 Non-engagement part 34 Large-diameter hole (second engaging part) 35 groove 36 Widening part 38a First position (holding closed) 38b Second position 38c Third position (open hold)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kimoro Kato 2-3-3 Shiba, Minato-ku, Tokyo Mitsubishi Aluminum Co., Ltd. (72) Inventor Masatsugu Kato 2-3-3 Shiba, Minato-ku, Tokyo Mitsubishi In Aluminum Co., Ltd. (72) Inventor Hiroshi Bandai 2-3-3 Shiba, Minato-ku, Tokyo Mitsubishi Aluminum Co., Ltd. (72) Inventor Yoshiya Suzuki 194 Senfuku, Susono, Shizuoka Prefecture Mitsubishi Aluminum Co., Ltd. (72 ) Inventor Takashi Sato 194 Senfuku, Susono City, Shizuoka Mitsubishi Mitsubishi Aluminum Co., Ltd. (56) References JP-A-62-152937 (JP, A) JP-A-56-138031 (JP, A) Mitsuihei 4-23534 (JP, U) Actually developed 62-90838 (JP, U) Actually developed 6-12184 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60P 1/44

Claims (6)

(57) [Claims] 1. An opening / closing member comprising at least an outer wall plate and an inner wall plate, a base end portion of which is rotatably attached to a cargo bed of a vehicle and in which the inner wall plate serves as a loading / unloading path for cargo in an open state. The plate-shaped member is provided in an opening formed in the inner wall plate so as to be openable and closable, and a biasing unit that biases the plate-shaped member in the opening direction. A mechanism for locking slipping of the load at the open end of the strip-shaped member and for holding an open / closed state of a roll stopper that allows the load to pass in the closed state, wherein A rod provided to be retractable toward the plate-shaped member side and an operating means for retracting the rod toward the plate-shaped member are provided, and the rod stopper side is provided with the rod at the open position of the plate-shaped member. First engaging portion engageable with the rod The plate-shaped member of the second roll stopper closing the holding mechanism, characterized in that a rod receiving member having an engaging portion for holding the closed state engages with the rod in the closed position. 2. A rod-shaped rod having a non-circular tip end, which is provided on the back side of the inner wall plate of the opening / closing member so as to be retractable toward the opening and rotatable about its axis. In addition to the member, the operating means includes a biasing member for biasing the rod in one direction of the projecting / retracting direction, an operating knob projecting on the outer circumference of the rod, and an inner wall plate of the opening / closing member. The operation knob is inserted, and the rod is projected to fit the first engaging portion, and the rod is rotated with respect to the first position to be projected. A switching groove for guiding and locking the operation knob at a second position where the second engaging portion is fitted and a third position where the rod is retracted from the rod receiving member. And the first engaging portion of the rod receiving member is the first engaging portion. Is a first hole having a shape capable of fitting the tip of the rod in a stationary position, and the second engaging portion can be fitted with the tip of the rod in the second position. The opening / closing holding mechanism for the roll stopper according to claim 1, wherein the opening / closing holding mechanism is a second hole having a shape. 3. The biasing member biases the rod in a direction in which the rod is projected toward the plate-shaped member, and an upper surface of a tip portion of the rod is inclined so as to be gradually inclined downward toward the tip portion. A surface is formed, and an inclined surface for guiding the rod is formed on the lower surface of the rod receiving member that is in contact with the inclined surface and is gradually inclined upward toward the rod side. The roll stopper open / close holding mechanism according to claim 2. 4. The rod has a large-diameter portion and a small-diameter portion formed in the axial direction so that the rod can project and retract toward the opening on the back side of the inner wall plate of the opening and closing member and can rotate around the axis. The rod receiving member includes a large-diameter hole portion that is fitted to the large-diameter portion of the rod in the closed state of the plate-shaped member, and a large-diameter portion and a small-diameter portion of the rod. A non-engaging portion that does not engage, and a locking portion that is locked by the large-diameter portion of the rod for movement in the closing direction when the plate-shaped member is in the open state, and the operating means includes the rod. An urging member for urging the rod in one direction of the projecting / retracting direction, an operating knob projectingly provided on the outer periphery of the rod, and the operating knob inserted through the inner wall plate of the opening / closing member, and the rod. And the first position where the large diameter part of the The operation knob is guided and locked at a second position where the large diameter portion of the rod is located at the non-engaging portion and a third position where the large diameter portion of the rod is located at the locking portion. The opening / closing holding mechanism for the roll stopper according to claim 1, further comprising: 5. The rod has the large-diameter portion formed at its tip, and the rod receiving member has the locking portion, the non-engagement portion, and the non-engagement portion sequentially in the advancing direction of the rod.
The large diameter hole portion is provided, and the locking portion has a downward opening through which the small diameter portion of the rod can be inserted and the large diameter portion cannot be inserted when the plate member is closed. Is formed on the opening side of the groove,
The roll stopper open / close holding mechanism according to claim 4, wherein a widened portion is formed through which the large-diameter portion of the rod can be inserted when the plate-shaped member is in an open state. 6. The opening / closing member is a ground plate of a tail lift of a transport vehicle, and the plate member is a flap of a roll stopper provided on the ground plate. 5. The open / close holding mechanism for the roll stopper according to any one of 5 above.