JPH0420072B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention has an arm member fixed to an opening/closing body and a base member attached to a main body to which the opening/closing body is mounted, which are pivotably connected to each other. The present invention relates to a hinge for an opening/closing body provided with a compression coil spring that biases the opening/closing body in the direction of opening by repelling the moment in the closing direction due to the own weight of the opening/closing body including the arm member.

2. Description of the Related Art For example, an opening/closing body such as a pressure plate for holding down a document in a copying machine or an opening/closing lid of a record player is pivotally attached to the main body of the copying machine or player, and the opening/closing body is moved between a fully open position and a fully closed position. A hinge for an opening/closing body of the above type having a so-called free stop function that can be stopped at an intermediate position is already known (see Japanese Patent Laid-Open No. 53-30324).

FIG. 7 is a simplified explanatory diagram of an example of a conventional hinge of this type.
a, and an arm member 4a fixed to the opening/closing body 2a, and these members 4a and 6a are pivotally connected to each other via a pin 11a. A guide sleeve 13a is rotatably supported on the arm member 4a via a pin 13b, a free end of a guide shaft 13c is slidably fitted into the guide sleeve 13a, and a base end of the guide shaft 13c is fitted with a pin. It is pivotally supported by the base member 6a via 22a. Also, the guide shaft 13
A compression coil spring 14a is wound around c, one end of which is connected to the spring receiver 13d of the guide shaft 13c.
The other end is in pressure contact with the guide sleeve 13a.

Now, in order to close the opening/closing body 2a, connect it with pin 11.
It is assumed that the user rotates in the direction of arrow P around point a and releases his/her hand from the opening/closing body 2a in the middle of the rotation. At this time, a moment in the closing direction due to the own weight of the opening/closing body including the arm member 4a acts on the opening/closing body 2a around the pin 11a. At the same time, due to the pressing force in the direction of arrow Q due to the elasticity of the spring 14a, a moment acts on the opening/closing body 2a in the direction of opening it. At this time, both moments are balanced and the opening/closing body 2a stops at that position. This is the free stop function of the hinge relative to the opening/closing body.

Problems to be Solved by the Invention As described above, in this type of hinge 1a, the biasing force of the compression coil spring 14a and
By balancing the moment due to the own weight of the opening/closing body 2a, the opening/closing body 2a is made to stop at an intermediate position. At that time, if we try to obtain this free stop function only by the force of the compression coil spring 14a, theoretically, the opening/closing body 2a will stop only when the opening/closing body 2a occupies a certain angular position in the intermediate position. However, the angular range in which the opening/closing body 2a can be three-stopped is extremely limited.

Therefore, when the opening/closing body 2a is in the intermediate position,
By applying a braking force due to friction to the side of the opening/closing body 2a, the opening/closing body can be free-stopped in a wide angular range, and the practicality can be improved.

However, if the above-mentioned frictional force is applied to the opening/closing body 2a, there is no problem since its own weight acts when closing the opening/closing body 2a, but the opening/closing body 2a
When opening the opening/closing body 2a, in addition to its own weight, the opening/closing body 2a must be lifted with a force that overcomes the frictional force acting on it, so a large operating force is required.
Operability deteriorates. In order to avoid this problem, if the frictional force acting on the opening/closing body 2a side is made extremely small, the range in which the opening/closing body 2a is free-stopped to an intermediate position can be narrowed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hinge for an opening/closing body that eliminates the above-mentioned conventional drawbacks with a simple structure and can be constructed compactly.

Means for Solving the Problems In order to achieve the above object, the present invention includes a base member attached to the main body side on which the opening/closing body is attached, and a base member which is pivotally connected to the base member and allows the opening/closing body to be freely moved from the pivoting part. an arm member extending toward the end and fixed to the side of the opening/closing body that faces the main body when the opening/closing body is fully closed; and a base member that is closer to the free end of the opening/closing body when the opening/closing body is fully closed than the pivot part. One end is pivotally connected to the arm member, and the other end is slidably fitted into a slot formed in the arm member in a substantially longitudinal direction thereof, through a slide pin that is slidably fitted into a slot formed in the substantially longitudinal direction of the arm member. an intermediate member that is slidably pivoted and rotatable about the one end in the same direction as the opening and closing body; and an intermediate member that is housed in the arm member and has one end on the free end of the opening and closing body; a guide shaft attached to the arm member, and one end of the arm member on the pivoting portion side that is accommodated in the arm member and pivoted to the other end of the intermediate member via the slide pin; a guide sleeve which is housed in the arm member and pressurizes the other end side of the intermediate member to repel the moment in the closing direction acting on the opening/closing body due to the own weight of the opening/closing body including the arm member; and a compression coil spring that biases the opening/closing body in the direction of opening, the compression coil spring being wound around the guide shaft and the guide sleeve, and one end of the spring being pressed against the other end of the intermediate member. The other end of the spring is pressed against a spring receiving member attached to the end of the arm member on the free end side of the opening/closing body, and the other end of the guide shaft is telescopically connected to the other end of the guide sleeve. The other end of the guide shaft is fitted in a scope-like manner, and the other end of the guide shaft is formed with a split and opens toward the one end of the guide sleeve in an approximately V-shape, with the maximum outer diameter part of the guide shaft being the guide shaft. We propose a hinge for an opening/closing body that is elastically pressed against the inner peripheral surface of the sleeve.

Embodiments Hereinafter, the present invention will be described based on illustrated embodiments.

Hinge 1 for the opening/closing body shown in FIGS. 1 to 4
For example, an arm member 4 is fixed to an opening/closing body 2 such as a document holding plate of a copying machine or a lid of a record player with a screw 5, and a similar screw 5a is attached to the main body 3 of the copying machine or player. It has a base member 6 integrally attached by. The arm member 4 has two base parts 7 onto which screws 5 are screwed.
and a tunnel-shaped portion 8 located at the center of both base portions 7. The arm member 4 is pivotably attached to the base member 6, and in this example, a pair of protrusions formed on the arm member 4 are attached to a bearing portion 9 protruding from one end of the base member 6. 10 are rotatably connected via a pin 11. Therefore, the opening/closing body 2 can freely rotate together with the arm member 4 between the fully open position shown in FIGS. 1 and 2 and the fully closed position shown in FIG. 4. When the opening/closing body 2 is in the fully open position, the protruding portion 10 of the arm member 4 hits a stopper 12 protruding from the base member 6, and the opening/closing body 2 is prevented from rotating in the opening direction beyond the fully open position. Ru.

As mentioned above, the arm member 4 is pivotally attached to the base member 6 attached to the main body side on which the opening/closing body 2 is attached, and the arm member 4 is connected to the opening/closing body from the pin 11 that is the pivoting part. 2, and is fixed to the side of the opening/closing body facing the main body 3 when the opening/closing body 2 is in the fully closed state as shown in FIG.

13 is a compression coil spring 1 which will be explained in detail later.
This guide 13 is a spring guide that holds or guides the guide sleeve 15 and the guide sleeve 15.
The guide shaft 16 is fitted into the sleeve 15, and these members 15, 16 are housed inside the tunnel-shaped portion 8 of the arm member 4. Guide shaft 1
A support pin 17 is protruded from one end of the free end of the opening/closing body 6, that is, the upper end of the guide shaft in FIG. It is pivotally attached to the constituent side walls 18. It is also possible to fix the pin 17 to the arm member 4. In this way, one end of the guide shaft 16 on the open/close body free end side is attached to the arm member 4.

Reference numeral 19 indicates an intermediate member, and one end side of this member 19 is located at the pivot point between the arm member 4 and the base member 6, that is, from the pin 11, when the opening and closing body is fully closed as shown in FIG. It is pivotally attached via a pivot pin 20 to an upright side wall 21 which is a base member portion closer to the free end side. The other end of the intermediate member 19 is pivotally connected to one end of the guide sleeve 15 via a slide pin 22, that is, to the end of the guide sleeve on the side of the pin 11, which is the pivot portion of the arm member 4. There is. Further, the arm member 4 has slots 23 formed in both side walls 18 of the tunnel-shaped portion 8 thereof, each extending substantially in the longitudinal direction of the arm member 4.
Each end of the slide pin 22 is slidably fitted into these slots 23. In this way, the other end of the intermediate member 19 is pivotally attached to the arm member 4 via the slide pin 22 so as to be slidable in the longitudinal direction thereof, and the intermediate member 19 is opened and closed about the pivot pin 20 on the one end side. It is rotatably supported in the same direction as 2.

The other end of the guide shaft 16 (the end closer to the pin 11) is slidable telescopically onto the other end of the guide sleeve 15 (the end farther away from the pin 11). They are mated.

The compression coil spring 14 is wound around the guide sleeve 15 and the guide shaft 16 and is housed in the tunnel-shaped portion 8 of the arm member 4, and one end of the spring (the lower end in FIG. 1) is connected to the intermediate member 19 and The other end of the spring 14 is pressed against a spring receiving member 24 attached to the end of the arm member 4 on the free end side of the opening/closing body. A pair of locking grooves 25 are formed in the spring receiving member 24, and these locking grooves 25
The support pin 17 is engaged with the spring receiving member 24, whereby the spring receiving member 24 is fixedly supported by the arm member 4. Also, a central groove 26 formed in the center of the spring receiving member 24
One end of the guide shaft 16 is inserted into the groove 26, and the end is in contact with a side wall surface defining the groove 26. This prevents the guide shaft 16 from shifting in the direction of arrow A (FIG. 1).

Furthermore, the slot 23, guide shaft 16, guide sleeve 15, and spring 14 are aligned with the center axis G of the pin 11 and the support pin 17 when viewed from the side shown in FIG.
The center axis D of the pivot pin 20 is located above the center axis G of the pin 11. Of course, the arrangement of each of the above elements can be changed as appropriate, but depending on this arrangement, when the opening/closing body 2 rotates as described later, the guide shaft 16 etc. can be rotated around the support pin 17. Therefore, in this example, the guide shaft 16 is not immovably fixed to the arm member 4, but is rotatably supported.

In the illustrated hinge, when the opening/closing body 2 is in the fully open position, the opening/closing body 2 is configured to form an angle of 90° with respect to the horizontal plane (the top surface of the main body), and at this time, the arm member 4 etc. The weight of the opening/closing body including its own weight does not act in the direction of closing the opening/closing body 2, so that the opening/closing body 2 is held in the fully open position shown in FIGS. 1 and 2.

When the opening/closing body 2 is manually rotated around the pin 11 from the fully open position to the fully closed position, the arm member 4 and the spring guide 13 also rotate together with the opening/closing body 2. Therefore, an external force is applied to the intermediate member 19 via the guide sleeve 15, and the intermediate member 19 rotates around the pivot pin 20 in the clockwise direction in FIG. At this time, since the pivot pin 20 that forms the center of rotation of the intermediate member 19 is separated from the pin 11 that forms the center of rotation of the opening/closing body 2, the slide pin 22 located at the tip of the intermediate member 19 is guided into the slot 23. It slides with respect to the arm member 4 while being moved. Therefore, the distance between the spring receiving member 24 and the slide pin 22 is shortened, the guide sleeve 15 and the guide shaft 16 are fitted into each other telescopically, and the overall length of both is shortened, and the spring 14 is connected to the spring receiving member. 24 and the intermediate member 19 and are compressed (see FIG. 3). At this time, the other end of the intermediate member 19 is pressurized by the elasticity of the spring 14, and is subjected to an external force indicated by the symbol F.

The opening/closing body 2 is closed as described above, but when the opening/closing body 2 reaches an intermediate position between the fully open position and the fully closed position, for example, the position shown in FIG. When the closing force applied to the opening/closing body is released, the moment in the closing direction of the opening/closing body trying to close the opening/closing body due to the own weight of the opening/closing body including the arm member 4 is applied to the central axis G of the pin 11. act around. At this time, intermediate member 1
9 is connected to the arm member 4 via the slide pin 22, the external force P that attempts to rotate the intermediate member 19 clockwise in FIG. 3 due to the above moment is applied to the central axis C of the slide pin 22. It acts on the position of

On the other hand, since the spring 14 is compressed and the external force F is applied to the intermediate member 19 at the position of the central axis C, the intermediate member 19 is forced to rotate in the counterclockwise direction. A moment acts. The central axis C of the slide pin 22 is located closer to the opening/closing body 2 than the line segment L connecting the central axis D of the pivot pin 20 and the central axis E of the support pin 17, and the force F acting on the position of this axis C is This is because, as is clear from FIG. 3, a moment is generated that rotates the intermediate member 19 counterclockwise. In this way, the above two moments, that is, the moments caused by forces P and F, act in opposite directions, and therefore, in order to make these two moments equal, the spring force of the spring 14 and the own weight of the opening/closing body are If set, the intermediate member 19 will stop without rotating in any direction. At this time, since the opening/closing body 2 is supported by the stopped intermediate member 19, the opening/closing body 2 will stop by itself at the intermediate position shown in FIG. Although a moment is also generated due to the weight of the intermediate member 19, this moment is ignored here for convenience of explanation). This is the free stop function for the opening/closing body.

As described above, the compression coil spring 14 pressurizes the other end side of the intermediate member 19 to repel the moment in the closing direction that acts on the opening/closing body due to the own weight of the opening/closing body including the arm member 4, and closes the opening/closing body 2. The function is to bias the opening direction. This provides a three-stop function, but in this case, the moment due to the spring force of the spring 14 and the self-weight of the opening/closing body are perfectly balanced only when the opening/closing body 2 is tilted to a certain angular position. be. Therefore, the range of intermediate positions of the opening/closing body 2 where the free stop function can be obtained is considered to be extremely limited.
Frictional force acts between each element of the opening/closing body 2, and a braking force acts on the opening/closing body, so in reality, this braking force, the weight of the opening/closing body, and the moment due to the spring force of the spring 14 are balanced. Therefore, a free stop function of the opening/closing body is obtained.

Furthermore, in order to increase this braking force, the guide sleeve 15 is configured to generate a desired level of frictional force through frictional contact with the guide shaft 16 fitted therein. That is, the other end of the guide shaft 16 (the end closer to the pin 11) is formed with a slit-shaped split 27, as shown in FIGS. 2 to 4, and the one end of the guide sleeve 15 is It opens toward the side (the end on the pin 11 side) in a substantially V-shape, and its maximum outer diameter portion is elastically pressed against the inner circumferential surface of the guide sleeve 15. The other end of the guide shaft where the split 27 is formed (hereinafter referred to as the tip) deforms elastically in the direction shown by arrow B in FIG.
It is in pressure contact with the inner circumferential surface of the Therefore, when the opening/closing body 2 operates, the tip of the guide shaft 16 comes into sliding contact with the inner circumferential surface of the guide sleeve 15, and the frictional force at this time exerts a braking force on the opening/closing body. Therefore, the opening/closing body 2 can be free-stopped over a wide angular range, and even if some vibration is applied to the opening/closing body 2 when it is in the fully open position, the braking force is applied in addition to the spring force to open/close the opening/closing body. Since it acts on the body, it is possible to prevent the opening/closing body 2 from wobbling.

The angle that the opening/closing body 2 makes with respect to the horizontal plane is θ (third
In experiments conducted using the device shown in the figure, it was possible to obtain a free stop function of the opening/closing body over the range of θ=30° to 90°. Of course, by appropriately changing the spring force, braking force, weight of the opening/closing body, etc., the angular range in which the free stop function can be obtained can be changed.

When the opening/closing body 2 rotates toward the fully closed position beyond the angular range in which the free stop function can be obtained, the moment due to its own weight overcomes other moments, and the opening/closing body reaches its fully closed position by itself. In this case, in this example, when the opening/closing body 2 reaches its fully closed position or a position near the fully closed position, the spring 14 is configured to bias the intermediate member 19 and, by extension, the opening/closing body 2 in the closing direction. ing.

That is, when the opening/closing body 2 exists in FIGS. 2 and 3, the slide pin 2
2 is located closer to the opening/closing body 2 than the line segment L connecting the central axis D of the pivot pin 20 and the central axis E of the support pin 17, and therefore the F caused by the spring 14 19 in a counterclockwise direction. However, when the opening/closing body 2 rotates to the fully closed position shown in FIG. 4 or a position near the fully closed position, the central axis C crosses over the line segment L and moves toward the main body 3. Therefore, the pressing force F exerted on the intermediate member 19 by the spring 14 acts on the intermediate member 19 to rotate it clockwise, as can be seen from FIG. In this way, the opening/closing body 2 is urged in the closing direction not only by its own weight but also by the spring 14, so that even when the opening/closing body 2 reaches the fully closed position and vibrates a little,
It cannot be easily lifted from the fully closed position. Therefore, when the opening/closing body 2 is a pressure plate for holding down a document in a copying machine, the document placed on the contact glass (not shown) on the main body of the copying machine can be
The document holding portion of the opening/closing body can press the document in close contact with the glass. If the original does not come into close contact with the contact glass and floats up from the glass, there is a risk that copy quality will deteriorate.

By the way, when the opening/closing body 2 is closed as described above, the V-shaped tip of the guide shaft 16 comes into sliding contact with the inner circumferential surface of the guide sleeve 15, and due to the relatively large frictional force generated thereby. , the opening/closing body can be free-stopped over a wide range, but even if such a large frictional braking force acts on the opening/closing body 2, when closing it, its own weight acts as a moment in the closing direction. So,
A particularly large force is not required to close the opening/closing body 2. On the other hand, if a large frictional braking force is applied to the opening/closing body 2 when it is opened, a large force is required to open the opening/closing body 2, and the operability of the opening/closing body 2 is significantly reduced.

However, according to the illustrated configuration, such problems can be reliably prevented. That is, when the opening/closing body 2 is free-stopped at an intermediate position or when the opening/closing body 2 is being closed, the guide shaft 16 has a shaft that enters the inside of the guide sleeve 15 as shown in FIG. 6a. Directional force P ₁
Also, since the tip of the guide shaft 16 is in pressure contact with the inner circumferential surface of the guide sleeve 15, no force is applied.
It receives a frictional force F ₁ in the opposite direction to P ₁ . At this time, the point of action of this frictional force F ₁ is shifted in the radial direction from the axis of the guide shaft 16, so the frictional force
Due to F ₁ , a moment or a force couple is generated (arrow Q ₁ ) that tends to open the tip of the guide shaft 16 which is opened in a V-shape. Therefore, the pressing force of the tip of the guide shaft 16 against the inner circumferential surface of the guide sleeve 15, and thus the frictional force _F1 , increases, and the opening/closing body 2
can be reliably free stopped over a wide angular range.

On the other hand, when opening the opening/closing body 2, the guide shaft 1
As shown in FIG. 6b, a force P ₂ is applied to the guide shaft 16 in the direction in which the guide shaft 16 comes out of the guide sleeve 15. As a result, a frictional force F 2 in the opposite direction to this force P ₂ is applied to the guide shaft 16, as shown in FIG. _6b . It acts on the tip of the guide shaft 16 that is in contact with the inner peripheral surface of the sleeve 15. This frictional force
Due to F ₂ , a moment or force couple is generated in the direction of closing the tip of the guide shaft 16 which is open in a V-shape (arrow Q ₂ ), contrary to the case shown in FIG. 6a.
Therefore, the pressing force of the tip of the guide shaft against the inner circumferential surface of the guide sleeve 15 is weakened, and the frictional force is reduced. Therefore, the operator can open and close the opening/closing body 2 with a small force.
can be opened.

In this way, when the opening/closing body 2 should be stopped at an intermediate position, a large frictional braking force is obtained for the opening/closing body 2, so the opening/closing body 2 can be stopped in a wide angular range, and When opening the opening/closing body 2, the frictional force can be reduced, the opening/closing body can be opened with a small force, and the operability thereof can be improved.

Although one embodiment of the present invention has been described above, the present invention can be modified in various ways to the above configuration. For example, when the opening/closing body reaches the fully closed position or a position near it, the compression coil spring It is also possible to eliminate the configuration that biases the device in the closing direction.

FIG. 5 shows a hinge for an opening/closing body that is substantially the same as that in FIG. 1, and parts corresponding to those in FIG. 1 are given the same reference numerals as in FIG. 1.

Effects According to the hinge according to the present invention, the guide shaft and the guide sleeve provided between the opening/closing body and the main body fit into each other in a telescopic manner, and the tip of the guide shaft is approximately half-shaped due to the split. It is shaped like a square, and its maximum outer diameter is in pressure contact with the inner circumferential surface of the guide sleeve, so the opening/closing body can be free-stopped over a wide range, and the opening/closing body can be opened with a small force. comes out.

In addition, one end of the intermediate member is pivotally connected to the base member portion that is closer to the free end when the opening/closing body is fully closed than the pivot joint between the base member and the arm member, and the other end is connected to the arm member along its almost longitudinal axis. The intermediate member is pivoted so as to be slidable in the direction, and the other end of the intermediate member is pressurized by a compression coil spring to provide a free stop function for the opening/closing body. The compression coil spring when the body is open can be placed close to the opening/closing body, and the hinge can be configured compactly.

Moreover, since the compression coil spring is wound around the guide shaft and guide sleeve, and these springs, guide shaft, and guide sleeve are housed in the arm member, the space occupied by these elements can be kept small, which makes it possible to reduce the space occupied by these elements. However, the hinge can be made more compact.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing an opening/closing body equipped with a hinge according to the present invention and the main body, Fig. 2 is a sectional view taken along the line - - of Fig. 1, and Fig. 3 shows the opening/closing body when it reaches an intermediate position. FIG. 4 is a sectional view similar to FIG. 2 when the opening/closing body reaches the fully closed position; FIG. 5 shows a hinge that is substantially the same as FIG. 1. The perspective view and FIGS. 6a and 6b are diagrams for explaining the functions of the guide shaft and the guide sleeve, and FIG. 7 is an explanatory diagram showing a simplified hinge of a conventional opening/closing body. DESCRIPTION OF SYMBOLS 1... Hinge, 2... Opening/closing body, 3... Main body, 4... Arm member, 6... Base member, 14... Compression coil spring, 15... Guide sleeve, 16... Guide shaft, 1
9... Intermediate member, 22... Slide pin, 23... Slot, 24... Spring receiving member, 27... Split.

Claims (1)

[Scope of Claims] 1. A base member attached to the main body side on which the opening/closing body is attached; and a base member which is pivotally connected to the base member and extends from the pivoting portion to the free end side of the opening/closing body, and when the opening/closing body is fully closed. an arm member fixed to the side of the opening/closing body facing the main body; one end side of the base member being closer to the free end of the opening/closing body when the opening/closing body is fully closed than the pivot joint portion; the side is pivotally connected to the arm member so as to be slidable in the substantially longitudinal direction of the arm member via a slide pin that is slidably fitted in a slot formed in the substantially longitudinal direction of the arm member; an intermediate member rotatable around one end in the same direction as the opening/closing body; a guide shaft housed in the arm member and having one end on the free end side of the opening/closing body attached to the arm member; a guide sleeve that is accommodated in the arm member, and one end of the arm member on the pivoting portion side is pivotally connected to the other end of the intermediate member via the slide pin; a compression coil that is housed and pressurizes the other end side of the intermediate member to bias the opening/closing body in the direction of opening in response to the moment in the closing direction acting on the opening/closing body due to the own weight of the opening/closing body including the arm member; the compression coil spring is wound around the guide shaft and the guide sleeve, one end of the spring is in pressure contact with the other end of the intermediate member, the other end of the spring is
The guide shaft is in pressure contact with a spring receiving member attached to the end of the arm member on the free end side of the opening/closing body, and the other end of the guide shaft is fitted into the other end of the guide sleeve in a telescopic manner, and the guide A split is formed on the other end of the shaft and opens in a substantially V-shape toward one end of the guide sleeve, and the part with the maximum outer diameter is elastically attached to the inner circumferential surface of the guide sleeve. A hinge for an opening/closing body that is in pressure contact.