JPH11303498A - Supporter built-in type revolving door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To open and close a door easily by bearing moment by its own weight generated at the time of the opening and closing of the revolving door rotated around the horizontal shaft of a structure to a supporter housed in revolving door itself. SOLUTION: A side flapper 3 is installed to the channel 2 of a truck car body by hinges, and an open-close supporter 21 is mounted to the inside of the flapper 3 and the channel 2. The open-close supporter 21 consists of a transmission mechanism 22, a shaft 23, a cam 24, a torsion bar 25, a cam follower 26, etc. When the cam 24 is rotated with the revolution of the side flapper 3, the cam follower 26 is turned, and the torsion bar 25 is twisted. When the side flapper 3 is opened, energy is stored in the torsion bar 25. Consequently, the quantity of potential energy lost in the side flapper 3 and the quantity of energy increased stored in the torsion bar 25 can coincide in all opening of the side flapper 3. Accordingly, the flapper can be opened and closed by force corresponding to the frictional force of each section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a revolving door attached to a cargo box of a truck, a cargo box of a van-type truck, and other structures. A revolving door with a built-in support device that incorporates a support device that facilitates itself.

[0002]

2. Description of the Related Art Of the revolving doors attached to a structure, those having a structure that rotates about a vertical axis resist the frictional force of each part at the time of rotation because there is no vertical movement of the center of gravity due to the rotation. Since it can be opened and closed by force, it can be easily opened and closed by human power unless it is extremely heavy. However, in the case of the structure that rotates around the horizontal axis, opening and closing is not easy because a moment about the horizontal axis due to the weight of the door is applied in addition to the frictional force of each part at the time of rotation. For example, in the case of a packing box for a large truck, when opening and closing the side swing which is the revolving door, several tens of kg-m to 100
A moment of Kg-m is added, and opening and closing by human power is impossible.

Conventionally, several methods have been proposed to solve this problem. FIG. 15 (front view), FIG. 16
(Side view) shows an example. That is,
In both figures, a tilting opening / closing assisting device 11 is attached to a vehicle body 1 such as a truck, so that it can be easily opened / closed by human power. Tilt opening / closing assist device 1
Reference numeral 1 denotes a gantry body 12, a coil spring 13, a link mechanism 14, and a transmission mechanism 15. The gantry body 12 is fixed to a channel 2 which is a main member of the vehicle body 1 such as a truck by bolts or the like. A shaft 13A having a spring seat at one end is attached to the coil spring 13, and a coil spring 13 is provided between one surface of the gantry body and the spring seat.
Is armed. A bracket 4 is attached to the outer surface of the swing 3 of the truck or the like via a stiffening plate, a bolt, or the like. The link mechanism 14 has one end pivotally connected to the bracket 4 via a pin via a pin, one end pivotally connected to the other end of the pivot arm via a pin, and the other end via a pin. It consists of a driven arm 14B pivotally attached to the gantry body 12. The transmission mechanism 15 has a rod 15A having one end pivotally connected to a driven arm 14B of a link mechanism via a pin.
And has three ends, a first end pivotally connected to the gantry body 12 via a pin, and a second end pivotally connected to the other end of the shaft 13A via a pin. And a lever 15B pivotally connected to the other end of the rod 15A via a pin at the third end.

[0006] The swing 3 of a truck or the like rotates about the axis of a hinge 5 attached to the channel 2 of the vehicle body 1. At that time, a moment is generated by the weight of the swing. This moment is transmitted to the coil spring 13 via the link mechanism 14 and the transmission mechanism 15, and is supported by the spring force. The moment generated by the own weight of the swing changes in a sinusoidal curve depending on the opening degree, but the spring force of the coil spring 13 is appropriately selected and adjusted, and the arrangement dimensions of the respective components of the link mechanism 14 and the transmission mechanism 15 are arranged. Is appropriately selected, the moment and the spring force can be substantially balanced at all the opening degrees. Therefore, the opening and closing of the swing can be lightly opened and closed by human power with a force substantially corresponding to the total mechanical frictional force of a movable part such as a hinge.

[0005] However, the above-described assist device for opening and closing a swing of a truck or the like still has the following disadvantages. That is, since the total weight of the components becomes considerably large, the mounting weight of the truck and the like is reduced accordingly. The main components are mounted below the channel 2, which is a main member of the vehicle body such as a truck.
This portion is a storage space for accessories such as trucks, parts, and the like, and thus restricts the storage. In the case of a large truck, the maximum value of its width is limited by the law, but among its components, the link mechanism 14
And the like, which protrude outside the tilt, limit the inner dimensions of the packing box. Because of the mechanism, the moment and the spring force cannot be perfectly balanced at all the opening degrees of the tilt, so that when the tilt is heavy, the opening and closing cannot always be performed lightly. Although the prior art has described the drawbacks and the like by referring to the tilting opening and closing assist device for trucks and the like, similar drawbacks exist for other revolving doors, for example, opening and closing assist devices such as the rear door of a van type truck. ing.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the truck tilting assist device, and is lightweight, does not require a large space for installation, and is not restricted by the inner dimensions of the packing box. It is still another object of the present invention to provide a revolving door having a built-in opening / closing auxiliary device in which the moment and the spring force supporting the moment fully correspond at all the opening degrees of the tilt.

[0007]

[Means and Actions for Solving the Problems] The present invention comprises the following elements (a) to (e) inside a revolving door rotatably supported on a structure such as a box around a horizontal axis. The above-mentioned object is achieved by providing the opening and closing support device. (A) A transmission mechanism for transmitting the rotary motion of the rotary door to the rotary motion of a rotary shaft described later. (b) a rotating shaft that is built in the rotating door and that is rotatably supported by the rotating door via a bearing. (c) a cam fixed to the rotating shaft and having a curved surface formed of a line segment which is parallel to the axis of the rotating shaft and whose distance from the axis gradually changes; (d) built in the revolving door, made of a round bar of an elastic material such as spring steel, one end of which is fixed to the revolving door, and the other end of which is rotatably supported by the revolving door via a bearing. Torsion bar. (e) one end is fixed to the other end of the torsion bar,
A cam follower having the other end pressed against the curved surface of the cam.

When the present invention is carried out, it is possible to take various modes as shown below according to the state of use. A chain gear whose axis is located on an extension of the axis of the horizontal shaft, and which is non-rotatably fixed to a structure such as the box; and a chain fixed to the rotation shaft. What consists of a gear and a chain meshing with both chain gears can be conveniently used. The transmission mechanism has a shaft whose axis is located on an extension of the axis of the horizontal shaft, and which is non-rotatably fixed to a structure such as the box, a gear fixed to the rotation shaft, and the fixed What consists of a gear and a meshing gear can be conveniently used. The revolving door with a built-in support device can be attached to various structures, structures such as vehicles, among which the structure is a cargo box of a truck, and the revolving door is a side or rear swing. The case and the case where the structure is a packing box of a van-type truck and the revolving door is a rear revolving door are considered to be representative examples that can be used very conveniently.

By adopting the above-described configuration and an embodiment corresponding to the use situation, the torsion bar is lighter than the coil spring having the same spring force, and the transmission mechanism, the rotary shaft, etc. are parts corresponding to those in the prior art. It is lighter than the above, and the amount of reduction in the mounting weight of trucks and the like is small. In addition, since most of the components are built in the revolving door, there is almost no risk of restricting the storage of accessories such as trucks and parts. Further, since there is almost no overhang of the lift of the heavy truck, the inner dimensions of the packing box are not restricted. In addition, by precisely machining the cam profile, the moment and spring force can be perfectly balanced at all opening degrees of the tilting (rotating door), and the opening and closing of the tilting is performed by the force equivalent to the frictional force of each part. It can be carried out.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (front view), FIG. 2 (view taken along the line PP in FIG. 1), FIG. 3 (view taken along the line QQ in FIG. 1), FIG.
FIG. 1 is a view showing a first embodiment of the present invention, in which the present invention is applied to a side tilt of a packing box of a truck. FIG. 1 shows a state in which the outer plate of the side tilt is removed, and only the main part of the right half of the center line is shown. In FIG. 1 to FIG. 4, a side tilt 3 is attached to a channel 2 which is a main member of a truck body 1 by a hinge (not shown). The opening and closing support device 21 is provided between the inside of the swing 3 and the channel 2.
Is provided.

The opening / closing support device 21 comprises a transmission mechanism 22, a rotating shaft 23, a cam 24, a torsion bar 25, a cam follower 26 and the like. The rotating shaft 23 includes a central bracket 27 fixed to the swing 3 and left and right brackets 28.
(The left part is not shown. The left side of each component having left and right is not shown below.) Is rotatably supported via a bearing. Cams 24 are fixed to left and right ends of the rotation shaft. There are two left and right torsion bars 25, one end of which is fixed to the central bracket 27 so as not to rotate, and the other end is rotatably supported by the left and right brackets 28 via bearings. The rotation axis and the torsion bar are parallel. One end of a cam follower 26 is fixed to the other end of each torsion bar, and the other end is pressed against the curved surface of the cam by the spring force of the torsion bar. The transmission mechanism 22 is non-rotatably fixed to the channel 2, and is fixed to both left and right fixed chain gears 22 </ b> A having the same axis as the hinge shaft, and both sides of the center bearing of the rotation shaft.
Left and right rotating chain gears 22B, and chain 22 meshing with both chain gears
C.

FIG. 5 is an enlarged view showing a state in which the rotational movement of the side tilt 3 of the truck having the above-described opening / closing support device built therein is transmitted to the rotating shaft 23. FIG. In the figure, X is the axis of the hinge (fixed chain gear), and Y ₁ , Y ₂ , and Y ₃ are the axes of the rotating shaft 23 when the opening of the side tilt 3 is 0 °, 90 °, and 180 °, respectively. . As is apparent from the figure, if the swing 3 rotates counterclockwise as shown, the rotating sprocket rotates clockwise, and the absolute value of the angle is the same. The rotating shaft and the cam rotate in the same manner as the rotating chain gear. FIG. 6 is a diagram exemplifying a cam profile. The cam has a curved surface that is a set of line segments that are parallel to the axis of the rotating shaft and whose distance changes sequentially. FIG. 6 is a cross-section of the curved surface cut by a plane perpendicular to the axis of the rotating shaft. It is shown. The figure shows the cam on the left side of the truck as viewed from the rear of the truck. The cam rotates clockwise as shown, and the actual cam profile is from 0 ° to 180 ° as shown. O in the drawing is the axis of the rotating shaft.

Since the cam follower 26 is in pressure contact with the curved surface of the cam, the cam follower 26 is moved to the right in FIG.
The cam follower rotates counterclockwise about the axis of the torsion bar 25, and the torsion bar twists. When the side swing 3 is opened, the energy at the position held by the side swing is reduced by lowering the center of gravity, but the energy is stored in the torsion bar 25 by being twisted. Therefore, by properly selecting the spring constant, diameter, effective length, and cam profile shape of the torsion bar, the amount of energy loss at the position of the side tilt and the amount of energy stored in the torsion bar can be stored at all opening degrees of the side tilt. It is possible to match the increase in energy. In this way, the side swing of the truck can be easily opened and closed only by the force against the frictional force of each part accompanying the opening and closing, and human power is usually sufficient.

Next, an example of the specification of the torsion bar and the selection of the cam profile will be described. Weight of side tilt is 1
00Kg, side tilt from vertical position 0 ° to vertical position 180
°, and the total movement of the center of gravity is 400 mm. The energy loss E _{0 in} the case of the opening ψ with respect to the vertical position of 0 ° is calculated by the following equation (1). FIG. 7 shows the result. E ₀ = weight of side tilt × reduction of center of gravity position = 100 × 200 (1−cosψ) (1)

[0015] The torsion bar as the diameter 10mm, the selection two ones of the effective length L _e = 500 mm. In this case, the relationship between the torque T applied to one torsion bar and the torsion angle φ is expressed by the following equation (2). Further, the energy E stored in the torsion bar in the case of the twist angle φ is calculated by the following equation (3). Here, E: energy storage (kgf · mm) T: Torque (kgf · mm) d: the torsion bar diameter (mm) G: modulus of rigidity after setting process _{^{(kgf / mm 2) L e}} : torsion bar Effective length (mm) φ: twist angle (°) As the value of G, G = 1.365 × 10 ⁴ (kgf /
mm ² ), equation (3) becomes the following equation (4). Energy Ozuru the opening ψ side tilt - shall store loss E ₀ in two torsion bars, and to press contact with the surface of the continuously cam the tip of the cam follower, two even when ψ is 0 Assuming that the initial energy E ₀₀ = 4000 (kgf · mm) is given to each of the torsion bars, the torsion angle φ to be given to the two torsion bars is as shown in FIG.

Next, the distance between the pressed portion of the cam follower against the cam surface and the center of the torsion bar is set to 60 mm. In this case, if the amount of increase in the distance from the center of the cam of the cam surface corresponding to the opening ψ to the cam surface corresponding to the opening ψ = 0 ° is ΔL, the amount is as shown in FIG. . From this table the cam can be made.

In the second embodiment of the present invention, the revolving door with a built-in support device according to the present invention is applied to a rear door of a van type truck. That is, FIG. 10 is a view showing a van-type truck, in which a rotating door 7 is provided at the rear of the packing box 6. FIG. 11 ((a) is a front view, (b)
(Side view) is a view showing a main part near the revolving door. In the figure, a rotating door 7 is attached to a rear part of a packing box 6 by a hinge 5 so as to be openable and closable. An opening / closing support device 31 is provided at the rear of the packing box and inside the revolving door.

FIGS. 12, 13 and 14 respectively correspond to FIG.
1 is an arrow view of an SS section, a TT section, and a UU section in FIG. 11 to 14, the open / close support device includes a transmission mechanism 32, a rotating shaft 33, a cam 34, a torsion bar 35, a cam follower 36, and the like. The rotating shaft 33 is a central bracket 3 fixed to the rotating door 7.
7. Left and right brackets 38 (the right one is not shown; the right side of each component having left and right is not shown below) are rotatably supported via bearings. Both ends of the rotating shaft protrude outside the door through the side end surfaces of the rotating door. Cams 34 are provided near the left and right ends of the rotating shaft in the rotating door.
Has been fixed. There are two left and right torsion bars 35, one end of which is fixed to the central bracket 37 so as not to rotate, and the other end is rotatably supported by the left and right brackets via bearings. The rotation shaft 33 and the torsion bar 35 are parallel. One end of a cam follower 36 is fixed to the other end of each torsion bar, and the other end is pressed against the curved surface of the cam by the spring force of the torsion bar. The transmission mechanism 32 is non-rotatably fixed to a member at the rear of the packing box, and is fixed to a fixed chain gear 32 </ b> A having the same axis as the axis of the hinge 5 and to both ends of the rotation shaft 33 protruding outside the door. Left and right rotating chain gears 32B,
And a chain 32C meshing with both chain gears. Transmission condition of transmission mechanism, rotation axis, cam, cam follower, operation condition of torsion bar, selection of torsion bar specifications,
Since the selection of the cam profile is the same as that of the first embodiment, the description is omitted.

In the above-described embodiment, as a structure such as a box, a packing box of a normal truck and a packing box of a van type truck are used.
As for the revolving door, the former is described as a side door, and the latter as a rear door. However, it goes without saying that the present invention can be effectively applied to a revolving door of a building or other structure, a vehicle such as a car, a bus or the like. Although the transmission mechanism of the above embodiment uses a chain gear mechanism, a gear mechanism using a fixed gear in place of the fixed chain gear and a rotating gear in place of the rotating chain gear can be used. Fixed (chain) as in the first and second examples
When the distance between the shaft of the gear and the rotating shaft is large, an intermediate gear supported by the rotating door may be used.

[0020]

According to the present invention, there is provided a rotary shaft, a cam, a cam follower, and a rotary shaft, a cam, a cam follower, and the like. The following excellent effects can be obtained by supporting the apparatus with a support device composed of a torsion bar or the like. Conventionally used supporting devices usually use coil springs, but the torsion bar is lighter than a coil spring having the same spring force, and the transmission mechanism, rotating shaft, etc. are the same as those of the conventional supporting device. It is lighter and requires less reduction in the mounting weight of trucks and the like. Since most of the components are built in the revolving door, there is almost no risk of restricting the storage of accessories such as trucks and parts. Since there is almost no overhang of the heavy truck side swing, the inner dimensions of the packing box are not restricted. By precisely machining the cam profile, the moment and spring force can be perfectly balanced at all opening degrees of the tilting (rotating door), and opening and closing of the tilting is performed with a force equivalent to the frictional force of each part. be able to.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along a line PP in FIG. 1;

FIG. 3 is an arrow view of a QQ cross section of FIG. 1;

FIG. 4 is an arrow view of an RR section of FIG. 1;

FIG. 5 is an enlarged view showing a situation in which the rotational movement of the side swing is transmitted to a rotating shaft.

FIG. 6 is a diagram illustrating a profile of a cam.

FIG. 7 is a diagram showing the relationship between the opening degree of tilt and energy loss.

FIG. 8 is a diagram showing the torsion angle of the torsion bar corresponding to the energy loss caused by the opening of the tilt.

FIG. 9 is a diagram showing the relationship between the torsion bar torsion angle and the amount of increase in the distance from the cam center to the cam surface.

FIG. 10 is a view showing a van-type truck.

FIG. 11 is a diagram showing a main part near a revolving door of a van type truck.

FIG. 12 is a sectional view taken along the line SS in FIG. 11;

FIG. 13 is an arrow view of a TT section of FIG. 11;

FIG. 14 is a sectional view taken along the line UU in FIG. 11;

FIG. 15 is a front view showing a conventional side opening / closing assisting device for a track.

FIG. 16 is a side view showing a conventionally used side opening / closing assisting device for a track.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Body 2 Channel 3 Tilt (side tilt) 4 Bracket 5 Hinge 6 Packing box 7 Revolving door 11 Tilt opening / closing auxiliary device 12 Stand body 13
Coil spring 13A shaft 14 link mechanism 14A rotating arm 14B driven arm 15 transmission mechanism 15A rod 15B lever 21 opening and closing support device 22 transmission mechanism 22A fixed chain gear 22B rotating chain gear 22C chain 23 rotating shaft 24 cam 25 torsion bar 26 cam follower 27 Central bracket 28 Left and right bracket 31 Opening and closing support device 32 Transmission mechanism 32A Fixed chain gear 32B Rotating chain gear 32C Chain 33 Rotating shaft 34 Cam 35 Torsion bar 36 Cam follower 37 Central bracket 38 Left and right bracket

Claims (5)

[Claims] 1. A revolving door rotatably supported on a structure such as a box around a horizontal axis, wherein the revolving door includes the following (a) to (d):
(e) comprising a supporting device comprising:
A pivoting door with a built-in support device, wherein the door is easily opened and closed by supporting a moment about the horizontal axis. (a) A transmission mechanism for transmitting the rotational movement of the rotating door to the rotational movement of a rotating shaft described later. (b) a rotating shaft that is built in the rotating door and that is rotatably supported by the rotating door via a bearing. (c) a cam fixed to the rotating shaft and having a curved surface formed of a line segment which is parallel to the axis of the rotating shaft and whose distance from the axis gradually changes; (d) built in the revolving door, made of a round bar of an elastic material such as spring steel, one end of which is fixed to the revolving door, and the other end of which is rotatably supported by the revolving door via a bearing. Torsion bar. (e) one end is fixed to the other end of the torsion bar,
A cam follower having the other end pressed against the curved surface of the cam. 2. The transmission mechanism has a chain gear whose axis is located on an extension of the axis of the horizontal shaft, and which is non-rotatably fixed to a structure such as the box; The revolving door with a built-in support device according to claim 1, comprising a fixed chain gear and a chain meshing with both chain gears. 3. A gear whose axis is located on an extension of the axis of the horizontal shaft and which is fixed to a structure such as a box so as not to rotate, and which is fixed to the rotating shaft. 2. The revolving door with a built-in support device according to claim 1, wherein the revolving door comprises a fixed gear and a gear meshing with the fixed gear. 4. The truck or the like, wherein the structure such as a box is a cargo box of a truck, and the revolving door is a swing of a side portion or a rear portion of the truck. Revolving door with built-in support device. 5. The structure according to claim 1, wherein the structure such as the box is a packing box of a van type truck, and the revolving door is a revolving door at the rear of the van type truck. Any one of the revolving doors with a built-in support device.