JPH0421036B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for rotatably pivoting an opening/closing body such as a crimp plate of a copying machine or a cover of a record player to a main body of a copying machine or a player, and The present invention relates to a hinge for an opening/closing body having a so-called free stop function that can stop the door at an intermediate position between a fully open position and a fully closed position.

Prior Art This type of conventional hinge has a spring that applies an external force to the opening/closing body in the direction of opening the opening/closing body, and the spring force by this spring, the own weight of the opening/closing body,
Free stop function is achieved by balancing the braking force acting on the opening/closing body. However, conventionally,
Since a special friction member was provided to apply braking force to the opening/closing body, the structure of the hinge became complicated and the cost increased.

Purpose An object of the present invention is to make it possible to apply a predetermined braking force to an opening/closing body without using a special friction member, thereby simplifying the structure and reducing costs. The purpose is to provide hinges for

Configuration In order to achieve the above object, the present invention includes a base member fixed to the side of the main body on which the opening/closing body is attached;
An arm member fixed to the opening/closing body side and rotatably pivoted to the base member, a spring that biases the arm member and the base member in a direction to mutually open and expand the arm member, and a spring that holds the spring. The spring guide includes a guide shaft and a guide sleeve that are telescopically fitted to each other, and the base end of the guide shaft is connected to one of the arm member and the base member. The proximal end of the guide sleeve is pivotally connected to the other of the arm member and the base member, and the distal end of the guide sleeve is configured such that the distal end is elastically deformed in the radial direction. The present invention proposes a hinge for an opening/closing body in which a slit is formed and the outer diameter of the portion of the guide shaft that comes into sliding contact with the guide shaft decreases continuously toward the distal end of the guide shaft.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Hinge 1 for the opening/closing body shown in FIGS. 1 to 3
For example, an intermediate plate 2a is placed on the side of an opening/closing body 2 such as a crimp plate for holding down a document in a copying machine or a cover of a record player.
It has an arm member 3 fixed via a base member 3, and a base member 5 fixed to a main body 4 of a copying machine or a player to which the opening/closing body 2 is attached. 7 and two side walls 8, 9 rising from the base. Base member 5
A pin 11, which is prevented from coming off by a snap spring 10, passes through one end of the arm member 3, and both members 3 and 5 are pivotally connected to each other by this pin 11. Since the arm member 3 is rotatably pivoted to the base member 5 in this way, the opening/closing body 2 can be moved together with the arm member 3 to the main body 4 and the base member 5 in the fully open position shown in FIG. It can freely rotate between the fully closed position shown in Figure 3.

The hinge 1 also includes an arm member 3 and a base member 5.
The spring guide 12 for holding and guiding the spring 13 includes a compression coil spring 13 that urges both members in the direction of opening and expanding the two members. . A proximal end of the guide sleeve 14 is pivotally attached to the base member 5, and a proximal end of the guide shaft 15 is pivotally attached to the arm member 3.
That is, a projecting pin 16 provided at the base end of the guide sleeve 14 is rotatably supported in a recess 17 formed in both side walls 9 of the base member 5, and the base end of the guide shaft 15 is supported by a pivot 18. The arm member 3 is rotatably pivoted to both side walls 8 of the arm member 3.

The guide shaft 15 and the guide sleeve 14 are fitted into each other in a telescopic manner, and the distal end portion 14a of the guide sleeve 14 is formed into a tapered shape, and its leading edge is in frictional contact with the outer circumferential surface of the guide shaft 15. Therefore, when the guide shaft 15 slides relative to the guide sleeve 14 in its axial direction, the shaft 15 receives a braking action due to friction with the guide sleeve 14.

Further, the tip end 14a of the guide sleeve 14 includes
Preferably, two or more slits 19 are formed so that the tip can be elastically deformed in the radial direction, and the tip 14a is elastically pressed against the outer peripheral surface of the guide shaft 15.

On the other hand, the outer diameter of the portion of the guide shaft 15 that comes into sliding contact with the guide sleeve 14 is continuously reduced toward the distal end of the shaft 15, as clearly shown in FIG.

The compression coil spring 13 surrounds the guide sleeve 14 and the guide shaft 15,
It is guided by both members 14 and 15 during its expansion and contraction. Each end of the spring 13 is in pressure contact with a spring receiver 20 fixed to the base end side of the guide shaft 15 and another spring receiver 21 fitted into the guide sleeve 14, respectively. Spring receiver 20
is prevented from coming out of the guide shaft 15 by the snap spring 22.

As shown in FIG. 1, when the opening/closing body 2 is in the fully open position, its own weight does not act in the direction of closing the opening/closing body 2, and the opening/closing body 2 receives the spring force from the spring 13 together with the arm member 3. It stops at the fully open position.

When the opening/closing body 2 is rotated from the fully open position to the fully closed position shown in FIG. 3, the guide sleeve 14 and guide shaft 15 are fitted in a telescopic manner.
are in sliding contact with each other. When the opening and closing body 2 is released from the opening and closing body 2 when it reaches the intermediate position, the opening and closing body 2 receives a moment in the closing direction due to its own weight including the weight of the arm member 3. On the other hand, the opening/closing body 2 receives a moment in the opening direction due to the spring force of the spring 13, and when these moments are balanced, the opening/closing body 2 stops at an intermediate position. At this time, even if there is a slight difference between the two moments, the guide sleeve 14 and the guide shaft 15
Since they are in frictional contact with each other, the braking force mainly due to this friction acts on the opening/closing body 2, and the opening/closing body 2 can reliably stand still at the intermediate position. Since the braking force is obtained by the friction between the guide sleeve 14 and the guide shaft 15 in this way, the opening/closing body 2 can be moved over a wide range of intermediate positions between the fully open position and the fully closed position without the need for a special friction member. The free stop function allows copying work, record mounting work, etc. to be carried out efficiently.

As mentioned above, the distal end 14 of the guide sleeve 14
A slit 19 is formed in the tip 14a.
is in elastic pressure contact with the outer circumferential surface of the guide shaft 15, so when the guide sleeve 14 and the guide shaft 15 slide against each other, they contact each other very smoothly and the opening/closing body 2 can be closed smoothly. This also applies when opening/closing body 2 is opened.

Furthermore, since the outer diameter of the guide shaft 15 decreases toward its tip, as the opening/closing body 2 approaches its fully closed position, the guide sleeve 14 comes into sliding contact with the guide shaft portion whose diameter increases. ,
The frictional force between the guide sleeve 14 and the guide shaft 15 gradually increases. Thereby, even when the opening/closing body 2 approaches the fully closed position, the free stop function can be reliably obtained. That is, as the opening/closing body 2 approaches the fully closed position, the moment in the closing direction due to the own weight of the opening/closing body 2 increases.
Even if the moment in the opening direction due to the spring force of This can prevent problems that would impede the free stop function. In this way, the free stop function of the opening/closing body 2 over a wide angular range is guaranteed.

In addition, the weight of the opening/closing body 2, the spring force of the spring 13, the guide sleeve 14 and the guide shaft 1
It goes without saying that by appropriately setting the pressure contact force with 5, the angular range in which the free stop function can be obtained can be changed.

In the illustrated embodiment, when the opening/closing body 2 reaches the fully closed position shown in FIG.
The structure is such that a spring force in the closing direction is applied to the opening. That is, the central axis of the pin 11 and
When considering the line L (Fig. 3) connecting the center axis of the pivot 18, the center axis A of the protrusion pin 16 is below the line L at the point just before the opening/closing body 2 reaches its fully closed position. , and in the fully closed state, this axis A
is located completely above line L. For this reason, the spring 13 applies a moment to the opening/closing body 2 in the opening direction until the axis A is positioned on the line L when the opening/closing body 2 is closed, but when the opening/closing body 2 is completely closed, the spring 13 exerts a diagonally downward force on the opening/closing body 2 as indicated by arrow F, and provides a moment in the closing direction. Therefore, the opening/closing body 2 is forcibly pressed toward the main body 4 side. As a result, even when the opening/closing body vibrates to some extent, it is possible to easily prevent the opening/closing body from lifting from its fully closed position. Therefore, when this opening/closing body 2 is a pressure bonding plate for holding down an original in a copying machine, the original placed on a contact glass (not shown) provided in the main body of the copying machine is held in close contact with the glass. It can be held in the upright position.

The present invention can be constructed by making various modifications to the above embodiments. For example, as shown in FIG. 5, a cover 23 covering a spring 13 is attached to a spring guide 12
suitable locations, such as the projecting pin 16 and the guide sleeve 1.
4 or a spring receiver 21 or the like, or may be formed integrally with the cover 23 in advance, and the cover 23 may be configured to rotate together with the spring guide 12 when the opening/closing body 2 is opened/closed. Rotate the cover 23 to the pivot 1
8 or the spring receiver 20 side, or may be integrally molded. By providing such a cover 23, it is possible to prevent paper or other objects from being caught in the spring 13 when the coil spring 13 expands and contracts. This is particularly advantageous in a copying machine because the document is located near the opening/closing body 2. It is also possible to sandwich the cover 23 between the spring receiver 20 or 21 and the end of the spring 13.

In addition, the outer diameter of the tip of the guide shaft 15 is
By setting the inner diameter of the leading edge of the guide sleeve 14 to be smaller than the inner diameter of the tip end 14a, when the opening/closing body 2 is near the fully open position, the sleeve 1
4 and the shaft 15, the ability of the coil spring 13 to automatically rotate the opening/closing body 2 to its fully open position can be enhanced.

Furthermore, as shown in FIG. 6, the compression coil spring 13 is housed inside the guide sleeve 14, and each end of the spring 13 is placed in contact with spring receivers 20a and 21a fixed to the guide sleeve 14 and the guide shaft 15, respectively. You can also do this. With this configuration, it is possible to prevent paper or the like from being caught in the spring 13 without providing a special cover.

In addition, as shown in FIG. 7, the guide shaft 15
and the guide sleeve 14, a spring mooring member 20b,
21b are provided respectively, and these mooring members 20b,
It is also possible to tension the tension spring 13a on 21b and apply a spring force to both members 14, 15 in the direction in which they extend.

Also, the arm member and base member are connected to one pin 11.
(Fig. 1), as shown in Figs. 8 and 9, projecting pins 11a are provided on the opposing surfaces of both side walls 9 of the base member 5, and these pins 11a are The arm member 3 and the base member 5 can also be pivotally connected by rotatably engaging recesses 31 formed in both side walls 8 of the arm member 3. This configuration has the advantage that the number of parts can be reduced and the work of assembling or removing the arm member 3 and the base member 5 can be simplified.

Further, in each of the embodiments described above, the base end of the guide shaft 15 was pivotally connected to the arm member 3, and the base end of the guide sleeve 14 was pivotally connected to the base member 5. The proximal end portion may be pivotally attached to the base member, and the proximal end portion of the guide sleeve may be pivotally attached to the arm member. In short, the proximal end of the guide shaft is pivotally connected to one of the arm member and the base member, and the proximal end of the guide sleeve is pivotally connected to the other of the arm member and the base member.

Effects As described above, according to the present invention, braking force can be applied to the opening/closing body by the friction between the guide shaft and the guide sleeve that are fitted together in a telescopic manner, so there is no need to provide a special friction member. The number of hinge parts can be reduced, simplifying the structure and reducing costs. In addition, a slit is formed at the tip of the guide sleeve, and the tip is in elastic pressure contact with the outer peripheral surface of the guide shaft, so that the guide sleeve and the guide shaft can be brought into smooth sliding contact. Since the outer diameter continuously decreases toward the tip, the braking force increases as the opening/closing body approaches its fully closed position, making it possible to obtain a free stop function over a wide angular range.

[Brief explanation of drawings]

Figure 1 is a front view showing the hinge when the opening/closing body and arm member are in the fully open position, Figure 2 is a right side view of Figure 1, and Figure 3 is the state where the opening/closing body is in the fully closed position. A vertical sectional view, FIG. 4 is a front view with the guide shaft and guide sleeve taken out and it is clear that the outer diameter of the guide shaft decreases toward its tip, and FIG. 5 shows another embodiment. A front view, FIG. 6 is a partial cross-sectional view showing an embodiment in which a spring is installed inside the spring guide, FIG. 7 is a partial cross-sectional view showing an example in which a tension coil spring is used as the spring, and FIGS. 8 and 9. FIG. 7 is a perspective view showing another form of pivotal connection between the base member and the arm member. DESCRIPTION OF SYMBOLS 1... Hinge, 2... Opening/closing body, 3... Arm member, 4... Main body, 5... Base member, 12... Spring guide, 13, 13a... Spring,
14... Guide sleeve, 14a... Tip part, 1
5...Guide shaft, 19...Slit.

Claims (1)

[Claims] 1. A base member fixed to the main body side to which the opening/closing body is attached, an arm member fixed to the opening/closing body side and rotatably pivoted to the base member, and the arm member and the base member are connected to each other. It is equipped with a spring that urges both members in the direction of expansion and expansion, and a spring guide that holds the spring, the spring guide consisting of a guide shaft and a guide sleeve that are fitted into each other in a telescopic manner,
A proximal end of the guide shaft is pivotally attached to one of the arm member and the base member, and a proximal end of the guide sleeve is pivotally attached to the other of the arm member and the base member, A slit is formed at the tip of the guide sleeve so that the tip is elastically deformed in the radial direction, and the outer diameter of the portion of the guide shaft that comes into sliding contact with the guide sleeve is equal to the tip of the guide shaft. A hinge for an opening/closing body that is characterized by a continuous reduction toward the end.