JP2602277Y2 - Mounting structure of torsion bar for loading / unloading device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading device which is suitable for a van type vehicle having a double door at the rear of a vehicle body. To a torsion bar mounting structure.

[0002]

2. Description of the Related Art In general, when a loading tray elevating device is applied to a vehicle having a double door, if the loading tray is stored vertically in the rear surface of the door when not in use, it will hinder the opening and closing of the door. 2. Description of the Related Art There has been proposed a loading / unloading table elevating device in which a table can be stored under the floor at the rear of a vehicle body. An example of such a loading table lifting device is Japanese Patent Publication No. 2-6555. In other words, the loading tray lifting device disclosed in the above-mentioned publication is configured such that, with respect to a support member that moves up and down along a support column, a loading / unloading posture in which a foldable loading tray projects horizontally to the rear of the vehicle body in an extended state, and a vehicle body in a folded state. It is mounted so as to be able to turn to the storage position where it is stored horizontally downward, and between the support member and the load receiving table, the load receiving table is always erected to reduce the rotational operation force of the load receiving table. It has a torsion bar for biasing in the direction.

[0003] Further, the loading tray of the loading tray lifting device is generally of a foldable type, and is known to be provided with a torsion bar in order to reduce the turning operation force at the time of extension and folding. As such an example, for example,
No. 46242. The torsion bar described in the above publication is disposed along the boundary between the main receiving tray and the sub receiving tray, and one end is locked to the main receiving tray and the other end is locked to the sub receiving tray, respectively. , The auxiliary receiving tray is always urged in the upright direction.

[0004]

In the case of the folding receiving trays described in the above publications, the folding center is folded in two. Therefore, the center of rotation (the hinge center) serving as the fulcrum of the folding is located near the upper surface of the receiving tray. By setting, folding becomes possible.
However, when the receiving tray is set to three or more folds, the center of rotation of the folding must be displaced upward from the upper surface of the receiving tray toward the base receiving tray. This is because, for example, in the case of three-folding, the receiving tray on the leading end side is sandwiched between the intermediate receiving tray and the receiving tray on the base side, so it is necessary to set the receiving tray upward in consideration of the thickness of the sandwiched receiving tray. Because there is. On the other hand, it is desirable that the torsion bar is disposed such that its axis is aligned with the center line of rotation of the receiving table. Therefore, when the receiving platform is a three-fold or more folding type as described above, the torsion bar for the receiving platform, which needs to set the center of rotation above the upper surface of the receiving platform, crosses the upper surface of the receiving platform. It will be arranged in an unusual form, and this will hinder the loading and unloading of luggage.

In view of the above-mentioned problem, the present invention is to dispose a torsion bar for reducing the rotation operation force of the load receiving table at a position away from the rotation center line of the load receiving table without impairing its function. It is an object of the present invention to provide a torsion bar mounting structure for a loading / unloading device that enables the above.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, a torsion bar mounting structure of a loading tray lifting device in which a foldable loading tray is reversibly mounted in a loading / unloading posture and a storage posture at the lower end of a lifting column that can be raised and lowered along a column. A torsion bar for reducing the rotating operation force at the time of changing the posture of the loading tray, which is provided near the rotation fulcrum of the loading tray with respect to the lifting column or near the folding fulcrum between the loading trays, has a width along the lower surface of the loading tray. Extendable in any direction and pivotable
And the torsion bar is connected to a hinge pin, which is a rotation fulcrum of the loading tray, via a rotation transmitting interlocking means , and furthermore, a specific range in the rotation range of the loading tray.
The rotation of the torsion bar with respect to
The bar is provided with a stopper mechanism for giving a twist .

[0007]

In the torsion bar mounting structure of the receiving platform lifting device [acting in accordance with the present invention configured as described above, receiving platform is
When the rotation operation is performed, the rotation of the hinge pin is performed via the interlocking means.
Is transmitted to the torsion bar and the torsion bar rotates.
When the receiving platform is turned to a certain angle,
In the later rotation range, the stopper mechanism is a torsion bar
The torsion bar is twisted to restrict the rotation of the torsion bar.
Therefore, according to the present invention, it is possible to dispose the torsion bar on the lower surface side of the load receiving table without impairing the function of the load, without impairing its function. In addition, stopper machine
The specific range within the rotation range of the loading table
The torsion bar can be activated for.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. This embodiment is applied to a vehicle having a double door at the rear end of the vehicle body, and as shown in FIGS. A cylindrical support 2 having a substantially rectangular cross section and having a vertically long slit is provided upright. A lifting column 3 having a substantially T-shaped cross section is inserted into the support 2 via a lift roller 4 so as to be vertically movable. At the same time, it is suspended by the wire 5. Then, the lifting column 3 is raised and lowered by the operation of a hydraulic cylinder (not shown) connected to the wire 5.

The loading tray 9 supported by the lifting column 3 and raised and lowered can be folded in three from a first loading tray 9A, a second loading tray 9B, and a third loading tray 9C.
Each of A, 9B, and 9C has a configuration in which a striped steel plate is superimposed and fixed on the upper surface of a hollow frame having a substantially rectangular vertical section and a rectangular frame. The loading table 9 having such a configuration is provided at the lower end of the elevating column 3 with a loading / unloading posture horizontally protruding to the rear of the vehicle body in the extended state shown in FIG. 1 and in the folded state shown in FIG. Is mounted so as to be rotatable so that it can be converted into a horizontal storage posture in which the front storage space is inverted and stored.

That is, column brackets 6 projecting rearward from the vehicle body are fixed to the lower ends of the left and right elevating columns 3, respectively, and a vertical section provided with brackets 8 on the upper surface of the left and right terminal portions is provided between the left and right column brackets 6. A hollow frame 7 having a substantially rectangular surface is laid horizontally, and hinge brackets 10 provided at the left and right front ends of the first loading tray 9A on the base side with respect to the bracket 8 of the hollow frame 7 are rotatable via hinge pins 11. Installed. And the first receiving tray 9A
In the unloading position, the downward rotation is restricted by the rear end surface of the frame abutting the front end surface of the hollow frame 7, and the striped steel plate abuts the upper surface of the hollow frame 7 in the storage position inverted forward. , The downward rotation is restricted. That is, the hollow frame 7 is
And a receiving member for receiving the rotation by its own weight and holding the loading tray 9 in both the unloading position and the storage position. The left and right hinge pins 11 are fixed to the hinge bracket 10 of the first loading tray 9A.

As shown in FIGS. 2 and 5, a first torsion bar 12 is provided in the hollow frame 7 for reducing the operation force at the time of reversing the rotation of the loading table 9 which is operated in the folded state. Is pierced. One end of the first torsion bar 12 is connected to the shaft 14 of the gear 13 rotatably mounted on the one column bracket 6 by fitting a square shaft and a square hole so as to rotate together. ing.
The gear 13 penetrates the column bracket 6 on the same side.
Gear 15 fixed to the tip of the extended hinge pin 11
Is engaged. That is, one end of the first torsion bar 12 is connected so as to rotate together with the hinge pin 11 via the interlocking means including the gears 13 and 15. The gears 13 and 15 are covered by a cover (not shown).

On the other hand, the other end of the first torsion bar 12
The base is connected to the other column bracket 6 so as to rotate around the center of the base of a lever 16 rotatably mounted by fitting a square hole and a square shaft. And
As shown in FIG. 6, when the loading tray 9 is rotated from the storage position to the unloading position as shown in FIG. 6, the lever 16 is torque-transmitted to the outer surface of the column bracket 6 when tilted slightly backward from the upright position. The rotation thereof is regulated by contacting the stopper 17 for use. Therefore, the first torsion bar 12 is twisted by the subsequent rotation of the load receiving table 9 due to its own weight, and an upward urging force acts on the load receiving table 9. That is, the lever 16 and the torque transmitting stopper
17, the specific range of the rotation range of the receiving table 9
Stopper machine that twists the first torsion bar 12
Structure is configured, the first torsion bar 12 biases only to the extent of about 90 ° receiving platform 9 to the standing direction of the unloading orientation, become a structure does not act on the remaining rotational range ing. The rotation of the lever 16 is restricted by the steady rest stopper 18 at the final stage of the storing operation of the load receiving table 9.

Next, the second receiving table 9B at the intermediate position
As shown in FIGS. 2 and 5, a hinge bracket 19 is provided at the left and right front ends thereof, and a hinge pin 20 fixed to the hinge bracket 19 allows the left and right rear of the first loading tray 9A on the base side to be provided. Bracket 21 protruding from the end
, The front end face of which is attached to the first receiving tray 9A.
The abutment is maintained in the unloading position by abutting against the rear end face. Further, a second torsion bar 22 is penetrated in the hollow rear frame of the first loading tray 9A to reduce the turning operation force at the time of extension and folding.
One end of the second torsion bar 22 has the first receiving tray 9A.
Is connected to a shaft 24 of a gear 23 rotatably mounted on one of the brackets 21 by fitting a square hole and a square shaft together, and the other end is connected to the other end of the first receiving tray 9A. It is non-rotatably connected to the bracket 21. The gear 23 is meshed with a gear 25 provided on the hinge pin 20, so that the second torsion bar 22 is interlocked with the hinge pin 20 through interlocking means by the gear when the second receiving table 9B rotates. The gears 23 and 25 are covered by a cover (not shown).

However, the second torsion bar 22 is
The neutral position is set when the loading tray 9B is in the upright posture, and the second loading tray 9B is set so that the second loading tray 9B is twisted by its own weight in the forward or rearward direction. Therefore, the second loading tray 9B is always biased toward the upright side, and the operating force at the time of folding and extension is reduced.

Next, the third receiving table 9C is shown in FIGS.
Hinge brackets 26 provided at the left and right front ends as shown in FIG.
Is a bracket 2 protruding from the left and right rear ends of the second receiving tray 9B.
7 is rotatably supported via a hinge pin 28, and the front end face abuts against the rear end face of the second receiving tray 9B in an abutting manner, thereby maintaining the unloading position. In the present embodiment, the third receiving tray 9C does not employ a structure for reducing the operating force by the torsion bar. However, the third receiving tray 9C has the above-described two-fold or three-fold second receiving tray 9B and the first receiving tray 9C. This is because the weight is lighter than the table 9A. However, it can be adopted if necessary.

A recess extending in the width direction is set near the rear end of the third receiving table 9C, and a caster stopper 29 is attached to the recess. Caster stopper 29
The rear end is rotatably supported by a pin 30 and is urged by a spring 31 provided around the pin 30 so that the front end always floats on the third receiving tray 9C. Further, a guide plate 3 is provided at the rear end of the third receiving table 9C.
2 is rotatably mounted via a hinge 33.
The conductive plate 32 is set to a loading / unloading posture in which it is inclined rearward and downward, and is held by a support member 34 fixed to the lower rear end of the third receiving tray 9C. Then, at the time of storage, it is folded on the third receiving tray 9C, and by this folding, the caster stopper 29 is pressed down and falls down in the recess.

The hinge pins 11 and 12 serving as the center of rotation of each of the receiving tables 9A, 9B and 9C in the receiving table 9 are provided.
As shown in FIG. 1, 0 and 28 are set at positions higher than the upper surface of the receiving table and higher at the base side. This is because the receiving table 9 is folded forward from the rear end of the guide plate 32 in order to be stored, and in the final storing position, is stacked on the hollow frame 7 as a receiving member in a reversed state, and This is because the thickness is sequentially increased with such sequential folding. For example, in the case of the third receiving tray 9C on the distal end side, since the guide plate 32 is interposed between the third receiving tray 9B and the second receiving tray 9B at the intermediate position, the height position of the hinge pin 28 is Is set in consideration of the thickness. Hereinafter, in the same manner, the second
The height positions of the hinge pins 20 of the receiving tray 9B and the hinge pins 11 of the first receiving tray 9A are set.

On the other hand, below the rear lamp 38 at the rear end of the vehicle body 1, when the folded receiving tray 9 is moved upward and stored in the underfloor space as shown in FIGS. A guide rail 34 is provided for receiving the load receiving table 9 which is turned forward and backward, and for guiding the receiving table 9 to the storage position. This guide rail 34
Is fixed to the inner surface of the lower end portion of one of the right and left columns (the right side in this embodiment). Specifically, the guide rail 34 extends substantially horizontally in the front-rear direction, and a rubber 34a is attached to an upper surface thereof. When the receiving table 9 is stored, the left side of the second receiving table 9B is closer to the front end. The guide roller 35 is provided so as to roll and guide the rotatable guide roller 35. The length is set such that the guide roller 35 is detached from the upper surface of the loading tray 9 in the final storage state.

A stopper 36 is provided on the lower surface of the rear end of the vehicle body 1 so as to contact the upper surface of the loading tray 9 in the retracted position to suppress the rattling. In addition, the receiving table 9 in the retracted state protrudes rearward from the rear end of the vehicle body 1 by a predetermined amount (less than the protruding amount of the column bracket 6).
The upper surface thereof, that is, the upper surface of the first receiving tray 9A, constitutes a step S for getting on and off the cargo room 37 in a state where the receiving tray 9 is stored.

The lifting / lowering device of the present embodiment is constructed as described above, and its operation will be described below. When loading / unloading the cargo in the cargo room 37 of the cargo handling vehicle, for example, when loading the cargo, the cargo receiving table 9 in the unloading position extended as shown by the solid line in FIG. . In this state, a trolley (not shown) loaded with the load is carried from the guide plate 32 onto the load receiving table 9. At this time, the caster stopper 29 falls down once by the passage of the wheel of the bogie, and stands and stops after passing. In this way, after loading the luggage, the hydraulic cylinder is driven to raise the loading table 9 together with the lifting column 3 to a position corresponding to the floor of the luggage compartment 37 as shown by the phantom line in FIG. The truck is carried into the luggage compartment, and the luggage is loaded into the luggage compartment 37. When unloading luggage from the luggage compartment 37,
The procedure is performed in the reverse order of the above.

On the other hand, when the loading tray 9 is stored after the loading / unloading work is completed, first, the loading plate 9 is lowered on the ground, and the guide plate 32 is pivoted about the hinge 33 as the third loading tray. Fold it on the table 9C. At this time, the caster stopper 29 is stored in the recess of the third receiving table 9C by the weight of the conductive plate 32. Subsequently, the third receiving tray 9C is folded on the second receiving tray 9B around the hinge pin 28 as a rotation center.

Further, the second receiving tray 9B is connected to the hinge pin 20.
Is folded on the first receiving tray 9A with the turning center as a rotation center. At this time, the second torsion bar 22 interlocked with the hinge pin 20 via the gears 23 and 25 moves the second
Until B is in the upright posture, it acts to rotate the second receiving tray 9B upward, and when it rotates forward beyond the upright posture, it is twisted in the opposite direction to resist the rotation. Act like so. Therefore, the folding operation force of the large-weight second loading tray 9B including the conductive plate 32 and the third loading tray 9C is reduced.

Subsequently, the first load receiving table 9A, that is, the entire load receiving table 9 folded in three steps (four steps inclusive of the conductive plate 32) is turned upward with the hinge pin 11 as the center of rotation. At this time, the first torsion bar 12 interlocked with the hinge pin 11 via the gears 13 and 15 acts to assist the upward rotation of the first receiving tray 9A, and the loading tray 9
To reduce the upward turning force. Then, near the position where the load receiving table 9 rotated upward exceeds 90 degrees, the guide roller 35 of the second load receiving table 9B rides on the rear end of the guide rail 34 on the vehicle body side as shown in FIG. In this position, the receiving table 9 receives rotation due to its weight. In this state, when the hydraulic cylinder is operated and the load receiving table 9 is raised together with the lifting column 3, the guide roller 35 rolls on the guide rail 34 and moves forward with the rise.

In this way, the load receiving table 9 is moved while turning forward and backward to be horizontal, and in the final storage position shown in FIG. 4, the guide roller 35 is disengaged from the upper surface of the guide rail 34, and the load receiving table 9 is moved right and left. Is mounted on the hollow frame 7 laid horizontally between the column brackets 6, and its upper surface abuts against a stopper 36 under the floor of the vehicle body 1. Therefore,
The receiving table 9 is held in a horizontal stable storage position. When the receiving table 9 rotates beyond 90 degrees, the lever 16 of the first torsion bar 12 freely rotates. Therefore, when the loading tray 9 is in the storage position, the first torsion bar 12 is at rest, which reduces the frequency of use and is effective in improving the durability. When the load receiving table 9 is in the storage position, the upper surface of the rear end forms an elevating step S as shown in FIG. 4, so that the user can get on and off the luggage compartment 37 using this elevating step S.

The conversion from the storage position of the receiving table 9 to the unloading position is performed in the reverse order of the above-described storing operation. That is, when the power lift is operated to lower the elevating column 3, the load receiving table 9 is pivoted to near an upright posture while being pulled out along the guide rail 34. Thereafter, the folded loading tray 9 is manually rotated backward until the first loading tray 9A is in the horizontal position, but when the loading tray 9 is rotated to a position near the upright position, it is indicated by a virtual line in FIG. 1st torsion bar-12 as shown
Since the lever 16 is restricted to rotate in the same direction in contact with the torque transmission stopper 17, the torsion bar 12 is twisted in the rotation range to a horizontal posture from the position. That is, an upward torque that acts against the rotation of the load receiving table 9 due to its own weight acts on the load receiving table 9, and the operation force is reduced. Thereafter, when the second receiving tray 9B, the third receiving tray 9C, and the guide plate 32 are turned backward and in the reverse order, the receiving tray 9 is converted into the extended unloading posture.

The present invention is not limited to the illustrated embodiment. For example, the guide rails 34 for guiding the load receiving table 9 to the storage position are installed on both the left and right columns 2, and the hinge pins of the load receiving table 9 are provided. It is possible to change the gear conduction type as the interlocking means between the first and second torsion bars 12 and 22 to the chain conduction type.

[0027]

[Effect of the Invention] As described in detail above, according to the present invention,
Since the position of the torsion bar can be freely set, the torsion bar can be disposed on the lower surface side of the load receiving table that does not hinder the carrying in and out of the load, which is effective in improving the workability of loading and unloading the load. In addition, since the center of rotation of the receiving tray can be set above the upper surface of the receiving tray, the number of folding of the receiving tray can be set to at least three or more, which is limited to the rear portion of the vehicle body. This is effective in reducing the storage space of the receiving tray when storing the storage space under the floor. Furthermore, according to the present invention,
The topper mechanism allows the top
Can be set to activate the application bar, for example
The rotation range from the storage position of the loading tray to the unloading position is 1
If the angle is as high as 80 degrees, change from horizontal to upright.
Only create torsion bars for areas where assistance is needed
Can be moved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a loading tray lifting device in which a loading tray is in an unloading position.

FIG. 2 is a perspective view showing a loading tray in an unloading position.

FIG. 3 is an explanatory diagram showing a mode of movement of the loading tray from the unloading position to the storage position.

FIG. 4 is an explanatory view showing a final storage posture of the receiving tray.

FIG. 5 is a plan view near the torsion bar assembly.

6 is a view as viewed in the direction of the arrow A in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body 2 ... Column 3 ... Elevating column 6 ... Column bracket 7 ... Hollow frame 9 ... Receiving stand 9A ... 1st receiving stand 9B ... 2nd receiving stand 9C ... 3rd receiving stand 11 ... Hinge pin 12 ... 1st torsion bar 13 , 15 ... gear 16 ... lever 17 ... torque transmitting stopper 20 ... hinge pin 22 ... second torsion bar 23, 25 ... gear 28 ... hinge pin 32 ... conductive plate 34 ... guide rail 35 ... guide roller

Claims (1)

(57) [Scope of request for utility model registration] 1. A torsion bar mounting structure for a loading / unloading device, wherein a folding receiving device is mounted at a lower end of a lifting column which can be moved up and down along a column so as to be able to reversely rotate between a loading / unloading position and a storage position. A torsion bar for reducing the turning operation force at the time of changing the posture of the loading table, which is disposed near the rotation fulcrum of the loading table with respect to the elevating column or near the folding fulcrum between the loading tables, is provided on the lower surface of the loading table. extending in the width direction along
And the torsion bar is connected to a hinge pin, which is a rotation fulcrum of the load receiving table, via a rotation transmitting interlocking means.
The rotation of the torsion bar is restricted in the specified range of
A torsion bar mounting structure for a loading tray raising / lowering device, comprising a stopper mechanism for imparting a twist to the torsion bar.