JPH0610556A - Hinge device for opening and closing cover body - Google Patents

Abstract

PURPOSE:To miniaturize an equipment such as a copier, which has a free stop function, in which the whole is compaced while improving the opening and closing operationability of a cover body and to which a hinge device is mounted and used. CONSTITUTION:The mounting member 1 of an opening and closing cover body and a mounting member 2 to a fixed body are connected in a relatively rockable manner through a support shaft 3 inserted into pivotal support sections 1b, 2b continuously connected to the mounting sections 1a, 2a of both mounting sections 1, 2 at right angles. A cam body 4 for displaying a free stop function by frictional force, strength of which changes in response to the angle of opening of the opening and closing cover body with the mutual sliding of cam surfaces 4a, 5a, a pushing member 5 and a spring 6 are assembled into a space between the pivotal support sections 1b, 2b of both mounting members 1, 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used when an opening / closing cover such as a pressure plate for pressing a sheet of a copying machine or a cover plate of a stereo is attached to a fixed body such as an apparatus body. The present invention relates to a hinge device for an opening / closing lid having a so-called free stop function capable of stopping the lid at an arbitrary opening angle.

[0002]

2. Description of the Related Art Since a hinge device having a free stop function can easily open and close an opening / closing lid, it is frequently opened and closed manually by hand, such as a pressure plate for pressing a sheet of a copying machine or a lid plate of a stereo. It is widely used for mounting lids, and various structures have been proposed.

FIG. 5 is a perspective view showing the structure of a hinge device of this type which has been generally used conventionally, as disclosed in, for example, Japanese Utility Model Publication No. 3-2628. , Fixed body mounting member (base holder)
One end of 101 and lid attachment member (opening / closing lid holder)
The one end of 102 is pivotally connected to the other end of the support shaft 100 via a support shaft 100 so that the two mounting members 101, 10
A rod-shaped spring guide 10 extending between the other ends of the two
3, a long coil spring 104 and a short coil spring 105 are wound around the outer peripheral portion of the spring guide 103, and a frictional force is applied to a portion where the opening / closing lid holder 102 and the base holder 101 face each other. The sliding surface 106 for exerting is formed.

In the hinge device having the above structure, when the opening angle of the opening / closing lid holder 102 is large and the moment in the closing direction around the support shaft 100 of the opening / closing lid holder 102 caused by the weight of the opening / closing lid is small, the opening / closing operation is performed. The lid holder 102 receives the urging force of the long coil spring 104, and the moment in the opening direction due to the urging force of the long coil spring 104, the moment in the closing direction due to the weight of the opening / closing lid, and the sliding surface 106 slide. The free stop function is demonstrated by balancing with the frictional force. The opening / closing lid holder 102 has a small opening angle, and the opening / closing lid holder 10 is generated due to the weight of the opening / closing lid.
When the moment in the closing direction about the second support shaft 100 is large, the opening / closing lid body holder 102 receives the urging force of both the long coil spring 104 and the short coil spring 105, and the urging force of these coil springs 104, 105 is applied. The free-stop function is exerted by the balance between the moment in the opening direction, the moment in the closing direction due to the weight of the opening / closing lid, and the frictional force due to the sliding of the sliding surface 106.

[0005]

By the way, in the conventional hinge device having the above-described structure, the spring guide 103, which is an essential structure for exhibiting the free-stop function, or the guide mechanism and coil springs 104, which replace the spring guide 103, is required. Since 105 and the like are hung between the other ends of the base holder 101 and the opening / closing lid holder 102 that are pivotally connected to each other so as to be capable of relative swinging,
There is a limit to shortening the length L of the opening / closing lid holder 102, and the length L tends to be considerably long. Therefore, with the opening / closing lid closed, the amount of protrusion of the tip portion of the opening / closing lid holder 102 protruding to the inside of the fixed body increases. Therefore, for example, when it is used for mounting a pressure plate for pressing a sheet of a copying machine, the opening / closing lid holder 1 is directed inward toward the upper surface of the device body in the closed posture of the pressure plate.
Since the tip of 02 is projected long, and the projection cannot be located on the exposure glass surface,
The size of the exposure glass surface is restricted, or an extra plate surface for mounting the protruding tip of the opening / closing lid body holder 102 on the upper surface of the device body in order to secure a predetermined area of the exposure glass surface. Therefore, there is a problem that a device to which the hinge device is attached and used becomes unnecessarily large in size.

The present invention has been made in order to solve the above-mentioned problems, and the structure for exhibiting the free-stop function can be skillfully incorporated into a narrow space to make the whole compact, and in particular, the mounting It is an object of the present invention to provide a hinge device for an opening / closing lid which is effective in reducing the size of equipment used.

[0007]

In order to achieve the above object, a hinge device for an opening / closing lid according to the present invention is arranged at the mounting portion of the opening / closing lid and both ends of the mounting portion in the width direction. And a lid mounting member having a pair of pivotally-supported portions that are connected to each other at a right angle, a mounting portion to the fixed body, and one end in the width direction of the mounting portion, which is connected to the mounting portion at a right angle. And a fixed body mounting member having a pivotal support section that is pivotally connected to each other through pivot shafts that are inserted through the pivotal support sections of the two mounting members, and is inserted through the pivot shaft, and its axis is rotated. A cam body having a disk-shaped cam surface is fixedly held on one of the pivotally supporting portions of the lid mounting member, and has a cam surface that is in sliding contact with the cam surface of the fixed cam body. Push the inserted pressing member to the fixed body mounting member in the axial direction. An elastic member is slidably held and is wound around the outer periphery of the support shaft so as to urge the pressing member in the axial direction so that the cam surface of the pressing member elastically comes into sliding contact with the cam surface of the cam body. The fixed body mounting member is interposed between the pivotal support portion and the pressing member.

[0008]

According to the present invention, the weight of the opening / closing lid attached to the attachment portion of the lid attaching member causes a moment in the closing direction around the support shaft to act on the lid attaching member. As the opening angle of the mounting member increases, the moment decreases, and conversely, as the opening angle decreases, the moment increases. Here, as the opening angle of the opening / closing lid body and its mounting member changes, the cam surfaces of the cam body and the pressing member, which are in sliding contact with each other, relatively rotate around the support shaft, and the pressing member moves toward the support shaft. Moved axially. The compression amount of the elastic member changes due to the axial movement of the pressing member, and the sliding contact resistance force between the cam surfaces due to the elastic force of the elastic member, that is, the friction force between the cam surfaces changes. Become. Therefore, if the shape of the cam surface is properly set, the moment in the closing direction and the frictional force due to the sliding contact of the cam surface are always in equilibrium, and the optimum free stop is possible within the opening angle range of the opening / closing lid. You can get the function.

By the way, the cam member and the pressing member are
Demonstrate the above-mentioned free-stop function by inserting and holding the support shafts inserted through the respective pivotal support parts of the lid mounting member and the fixed body mounting member, and winding the elastic member around the outer periphery of the supporting shaft. By incorporating all of the essential structural members in the narrow space between the pivots of the two mounting members, the overall size can be made compact, and in particular the length of the lid mounting member can be kept to the minimum required. It is possible to contribute to downsizing of the equipment to which it is attached and used.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a hinge device for an opening / closing lid according to an embodiment of the present invention, and FIG. 2 is a side view thereof. In FIG. 1, reference numeral 1 is a lid mounting member, for example, a pressure plate for pressing a sheet of a copying machine or A mounting portion 1a for fixing an opening / closing lid body such as a stereo lid body with a screw (not shown) or the like, and the mounting portion 1a arranged at both ends in the width direction of the mounting portion 1a.
a pair of disc-shaped pivotal support portions 1b that are connected at right angles to a,
1b and has a U-shaped cross section.

Reference numeral 2 denotes a fixed body mounting member, which is disposed at a mounting portion 2a for a fixed body such as a copying machine main body or a stereo main body and one end portion in the width direction of the mounting portion 2a and is perpendicular to the mounting portion 2a. It has one pivotally supported portion 2b that is continuously provided, and has a substantially L-shaped cross section. A boss portion 2c for inserting a support shaft, which will be described later, is integrally formed on the pivotal support portion 2b of the fixed body mounting member 2.

Reference numeral 3 denotes a support shaft, which is inserted into the pair of pivotally supporting portions 1b, 1b of the lid mounting member 1 and the pivotally supporting portion 2b of the fixed body mounting member 2 so as to relatively swing the both mounting members 1, 2. Pivotally support and connect. Reference numeral 4 denotes a disc-shaped cam body, and by inserting the central portion thereof into the support shaft 3, a disc-shaped cam surface 4a is formed around the shaft center of the support shaft 3 and a protrusion protruding from the back surface. A through hole 1c formed by attaching the piece 4b to one pivotally supporting portion 1b of the lid mounting member 1
Is fixedly held on one of the pivotally supporting portions 1b of the lid mounting member 1 by engaging with the.

A pressing member 5 is provided on the cam surface 4 of the cam body 4.
a has a cam surface 5a which is slidably contacted with a, the central portion of which is inserted into the support shaft 3 and, as shown in FIG. 3, a rectangular protrusion 5b provided on the outer peripheral portion of the cam surface 5a.
By being fitted into the groove 2d formed on the inner surface of the mounting portion 2a, the slidable holding member 2 is held by the fixed body mounting member 2 along the axial direction of the support shaft 3. Reference numeral 6 denotes a compression coil spring which is an example of an elastic member, and is wound around the outer periphery of the support shaft 3 between the pivotal support portion 2b of the fixed body mounting member 2 and the bottom portion of the recess 5c formed in the pressing member 5. The compression coil spring 6 elastically repels the cam surfaces 4a and 5a, the pivot support portion 2b of the fixed body mounting member 2 and the one pivot support portion 1b of the lid mounting member 1. Each of them is elastically brought into sliding contact with each other so that a frictional force is applied between them.

The opening / closing lid hinge device A configured as described above has a rectangular annular upper surface plate portion 9 formed around the exposure glass surface 8 of the copying machine body 7 as shown in FIG. 4, for example. The fixing portion 2a of the fixed body mounting member 2 is fixed via a screw or the like, and the mounting portion 1a of the lid body mounting member 1 is fixed to the sheet pressing plate 10 which is an opening / closing cover body with a screw or the like. It is used so that the sheet pressing plate 10 is attached to the upper plate portion 9 and the exposure glass surface 8 so as to be openable / closable by swinging around the support shaft 3 by being fixed via the support shaft 3. .

In such a use state, the cam surfaces 4a, 5a of the cam body 4 and the pressing member 5 which are in sliding contact with each other are supported by the change of the opening angle of the sheet pressing plate 10 and its mounting member 1. The pressing member 5 is moved in the axial direction of the support shaft 3 by relatively rotating around the shaft 3. The axial movement of the pressing member 5 changes the compression amount of the coil spring 6, and the elastic force of the coil spring 6 causes the sliding contact resistance between the cam surfaces 4a and 5a, that is,
The frictional force between the cam surfaces 4a and 5a changes.
Therefore, if the shapes of the cam surfaces 4a and 5a are properly set, the closing moment of the paper pressing plate 10 and the frictional force due to the sliding contact of the cam surfaces 4a and 5a are always in balance, and the paper pressing is made. A predetermined free-stop function is exerted within the opening angle range of the pressure plate 10, and the open / close operability of the paper pressure plate 10 can be made easy and good.

By the way, in the hinge device having the above-mentioned structure, the cam body 4 and the pressing member 5 are inserted over the respective pivotal support portions 1b, 2b, 2b of the lid mounting member 1 and the fixed body mounting member 2. The support shafts 3 are inserted and held respectively, and the coil springs 6 are attached to the support shafts 3
All of the components essential for exhibiting the above-mentioned free stop function, such as being wound around the outer circumference, are incorporated in the narrow space between the pivotal support portions 1b, 2b of the both mounting members 1, 2. The entire structure is very compact, and in particular, since the length L1 of the lid attachment member 1 can be stopped to the minimum necessary limit, the sheet pressing plate 1
In the closed posture of 0, the projection margin in which the tip of the lid mounting member 1 projects inward of the top plate 9 of the copying machine body 7 becomes very short. As a result, the width of the upper surface plate portion 9 occupied by the lid attachment member 1 can be reduced, and the occupation area of the exposure glass surface 8 with respect to the entire upper surface area of the copying machine body 1 can be increased. It is possible to reduce the size of a copying machine that is mounted and used.

The sheet pressing plate 10 of the copying machine does not need a free stop function when the opening angle is 5 to 10 ° or less, but requires a force for pressing the original document or the like against the glass surface 8. At this time, with the conventional hinge device as shown in FIG. 5, it is very difficult to adjust the hinge device. However, according to the hinge device having the configuration as shown in the above embodiment, the shape of the cam surfaces 4a and 5a can be set. , It is possible to obtain the pressing force as intended. Therefore, conventionally, in many cases, an attracting tool such as a magnetic catch is used to make up for the lack of pressing force, and the sheet pressing plate 10 is positively attracted to obtain a desired pressing force. When the hinge device according to the present embodiment is used, such a suction tool is unnecessary and the structure can be further simplified.

Further, in the above embodiment, the lid mounting member 1
And the fixed body mounting member 2 are each a single unit, and the support shaft 3, the cam body 4, and the pressing member 5 are provided between the both mounting members 1 and 2.
In the above description, the free stop function components such as the coil spring 6 and the like are interposed one by one. However, as the above-mentioned both mounting members 1 and 2, mounting members having a large width in the lateral direction are used. A plurality of sets of components for the free stop function may be arranged in a row in the width direction. In particular, it can be effectively used as a hinge device for an open / close lid having a large weight and a large shape.

[0019]

As described above, according to the present invention, a free stop function for stopping the opening / closing lid at an arbitrary opening angle is provided, and the opening / closing operability of the opening / closing lid can be made easy and good. Of course, the components for exerting the free-stop function are skillfully incorporated in the narrow space between the pivot parts that connect the lid attachment member and the fixed body attachment member to each other so that they can swing relative to each other. Thus, the hinge device as a whole can be made compact. In particular, since the length of the lid attachment member can be kept to the minimum required, there is no need to unnecessarily increase the size of the device such as a copying machine to which the hinge device is attached and used, and the effect of downsizing the device can be achieved. Play.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a hinge device for an opening / closing lid according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a schematic perspective view showing a usage example.

FIG. 5 is a perspective view showing the structure of a hinge device that has been commonly used in the past.

[Explanation of symbols]

 1 Lid body mounting member 1a Mounting part 1b Pivoting part 2 Fixed body mounting member 2a Mounting part 2b Pivoting part 3 Support shaft 4 Cam body 5 Pressing member 4a, 5a Cam surface 6 Coil spring (elastic member) 7 Copier body (fixed body) ) 10 Paper pressing plate (Open / close lid)

Claims (1)

[Claims] 1. A lid mounting member having a mounting portion of an opening / closing lid and a pair of pivotally supporting portions arranged at both ends of the mounting portion in the width direction and connected at right angles to the mounting portion, and a fixed body. And a fixed body mounting member having a pivotal supporting portion arranged at one end in the width direction of the mounting portion and connected to the mounting portion at a right angle to each pivotal supporting portion of the both mounting members. A cam body, which is connected to the support shaft so as to be relatively swingable, is inserted into the support shaft, and has a disc-shaped cam surface formed around the shaft center, is used as one pivotal support portion of the lid mounting member. And has a cam surface slidably contacting the cam surface of the fixed cam body, and a pressing member inserted into the support shaft is slidably held in the fixed body mounting member in the axial direction. The cam surface of the pressing member is elastically slid on the cam surface of the cam body. An opening / closing lid body, characterized in that an elastic member for axially moving so as to contact is wound around the outer periphery of the support shaft and is interposed between the pivotal support portion of the fixed body mounting member and the pressing member. Hinge device.