JPH0633175Y2 - Cover opener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial field of application The present invention relates to a structural improvement of a dustproof and soundproof cover opening / closing device used in office machinery such as a printer used as an output device of a computer. is there.

(2) Description of Prior Art As a conventional example of a cover opening / closing device used for an office machine tool such as a printer, there is one as shown in each drawing (FIGS. 8 to 11). In the structure shown in FIG. 8, a cylindrical shaft 4 is formed at the side end 3 of the cover 1, and this portion is provided with a bearing opening 5 provided in the device body 2 so that the side end 3 is elastically deformed. It is a fitting set through. In the case of this structure, since the bending direction of the cover side surface end portion 3 on which the shaft 4 is formed and the direction in which the shaft 4 is disengaged from the bearing opening portion 5 are the same, as a result, the cover 1 is attached to the device body 2 It has the drawback of being easier to come off. Further, as a countermeasure, if the height of the shaft 4 is increased and the amount of engagement with the bearing opening 5 is increased, it is more difficult to set the fitting because of the balance with the rigidity of the cover side surface end portion 3. Occurs. In addition to such a design problem, this system has a problem in mass production because dimensional control of the dimension between shafts and the dimension between bearing openings is required. FIG. 9 shows another conventional example. In this structure, a key-shaped recess 8 is formed at the side end of the cover 6, and the key-shaped recess 8 is inserted into the shaft 9 formed in the device body 7,
The cover 6 is opened and closed by using the shaft 9 as a fulcrum.
Compared with the above-mentioned conventional example, the side surface of the cover is bent, and it is difficult to attach the cover, and it is improved in terms of easiness of removal after attachment, but in terms of structure,
Since the direction in which the cover 6 is mounted on the shaft 9 is limited, it is difficult to set. Further, it goes without saying that it is easy to come off in the reverse direction of setting, so that it is possible that the recess 8 of the cover 6 is locked to the shaft 9 when the cover 6 is opened and closed, as shown in FIG. 9B. In this state, if an external force is applied to the cover 6 in the direction of the arrow f, there is a risk of damaging the shaft 9 or the recess 8. FIG. 10 shows a conventional example of another mode, which is different from the example shown in FIG. 9 in that the sliding mechanism on the mold is eliminated to reduce the initial cost.
On the other hand, the recess 13 of the cover 10 has the shaft 14 of the device main body 11.
On the other hand, in order to prevent the stopper from coming off except when the set is mounted, it is necessary to form a stopper 12 in the device main body 11 near the rotation supporting portion as shown in the figure. This is because the shape of the device body becomes complicated, and when the cover 10 shown in FIG. 10B has been rotated, if an external force f is applied, the stopper 12, the shaft 14, or the The recess 13 of the cover 10 is damaged, or the device body 11
Is lifted with the rear part in the direction of the arrow as a fulcrum, and there is a risk that the entire device is impacted by releasing external force f or the like. FIG. 11 is a prior art disclosed in Japanese Patent Application Laid-Open No. 62-90488, in which the cover 2 is provided on the device body 21 side.
It has a rotation support portion 23 that rotatably supports 2 and a locking piece 24 having elasticity, while the cover 22 includes the cover 2
In the state in which 2 is fully opened, the engaging piece 25 abuttingly locked to the locking piece 24, and the shaft portion 26 and the protrusion 27 which are rotationally guided using the rotational support portion 23 as a rotational guide. And are provided. In this example, the cover opening / closing mechanism is not damaged by a safety measure provided with an elastic locking piece 24 against an excessive load in the opening direction of the cover 22. However, this example also has the drawbacks described in FIGS. 9 and 10 that the cover 22 is easily disengaged from the device main body 21 from a certain direction, and the cover 22 should be removed as shown in FIG. 11C. Protrusion 2
If 7 is lifted up and an unreasonable force f is applied to the end of the rotation support portion 23 of the device body 21, the rotation support portion may be damaged. Further, since the cover rotation supporting portion and the holding portion in the cover opened state are separately formed, there is a drawback that the die manufacturing becomes complicated and expensive.

(3) Purpose of the Invention The present invention is intended to eliminate the above-mentioned drawbacks. The purpose of the invention is to provide a degree of freedom for attaching a cover to the device body, and to open and close the cover, the device body. The cover can be smoothly opened / closed in a stable posture with the cover pivot shaft formed as a fulcrum, and the cover opening / closing support can be prevented from being damaged by an overload in the cover opening direction. It is intended to provide a cover opening / closing device having a simple structure capable of holding the cover in an open state without detaching the cover in the state where the overload is not applied and having excellent reliability and operability. .

(4) Outline of the Invention According to the present invention, the device main body is provided with a rotation engaging portion which serves as a cover rotation supporting portion, and an elastic piece which is arranged to face the rotation engaging portion and has a gap. , Through the gap in the cover,
The elastic member that is inserted against the elastic force of the elastic piece and is provided with a cover protrusion that engages and rotates with the rotation support portion, and that retains the engaged and rotated state when the cover is opened and closed. The guide action of the one piece allows the cover projection to rotate while being prevented from engaging and disengaging.

(5) Embodiment of the Invention The invention will be described below with reference to FIGS. 1 to 7 based on an embodiment. FIG. 1 is an external view of an upper case of a printer used as an output terminal of a computer. The upper case is attached to a lower case (not shown) and becomes a part of a housing that forms a device body together with the lower case. Reference numeral 30 is an upper case which is a part of a housing forming the main body of the apparatus, 31 is a cover for covering the upper case opening 32, 33 is a cover opening / closing support portion, and 34 is a cover for rotating the cover opening / closing support portion. The cover projections are integrally supported and are formed to project in a direction perpendicular to the rotation axis. As shown in the enlarged view of the portion A, the cover opening / closing support portion 33 is arranged so as to oppose the rotary engagement portion 35 for pivotally supporting the cover projection 34 of the cover 31, and the engagement portion 35 with a gap. The elastic piece 36 is installed. Although this embodiment is a preferred embodiment in which each of these constituent parts is integrally molded, the elastic piece 36 of the upper case 30 or
The protrusion 34 of the cover 31 may be a separate member. FIG. 2 shows the cover opening / closing support 33 inserted in the gap (in the direction of the arrow).
It is a principal part expanded sectional view which shows the relationship with the cover 31 set. The gap A between the elastic piece 36 and the rotary engagement portion 35 is the total thickness B of the tip portion of the cover protrusion 34 passing through the gap A.
It is made narrower. Therefore, when the cover 31 is set in the upper case 30, when the protrusion 34 of the cover 31 is inserted toward the gap of the cover opening / closing support 33, the protrusion 3
The elastic piece 36 is bent downward against the elastic force at the tip end of No. 4. Wall surface 34 of protrusion 34 of cover 31
A contacts a rotary engagement portion 35 formed on the opening / closing support portion 33 of the upper case 30. This state is shown in FIG. In this state, the elastic piece 36 is in the returning state, the locking portion 34B of the cover projection 34 and the rotary engagement portion 35 are in the engaged state, and the cover 31 is locked in the pull-out direction. The cover 31 abuts and supports the wall surface 34A of the protrusion 34 in the rotating direction. 34C is a tip engaging portion that engages with the tip end portion 36A of the elastic piece 36 in the cover open state. FIG. 4 is a view showing a state in which the cover 31 is closed. In this embodiment, as shown in FIG. 1, the cover 31 is closed by bringing the peripheral edges of the cover 31 excluding the rotary shaft edge into contact with the peripheral edges of the opening of the device body 30 that face each other. Cover 31
The position regulation in the rotation axis direction at the time of opening / closing operation is performed between the cover protrusion of the cover 31 rotatably engaged and supported by the rotation engagement portion and the side wall installed in the rotation axis direction. It is done by the interaction of. As shown in FIG. 5 showing the state where the cover 31 has started to be opened and FIG. 6 showing the state where the cover has been completely opened, basically, in the process of opening the cover,
The rotation engaging portion 35 and the cover protrusion 3 formed on the upper case 30.
4 is engaged and supported with the locking portion 34B of the elastic piece 3
When the cover 31 is completely opened, the distal end locking portion 34C of the cover projection 34 and the distal end locking portion 3 of the elastic piece 36 are prevented while the cover 31 is completely opened.
It is performed by being elastically held by the engagement with 6A. As shown in FIG. 7, if an external force f is further applied to the cover 31 in the opening direction of the cover 31 from the state of FIG. 6, the protrusion 34 of the cover 31 causes the elastic piece 36 to move in the direction of the arrow. The engagement between the locking portion 34C of the cover projection 34 and the tip locking portion 36A of the elastic piece 36 is released at the same time as the bending of the cover projection 34 is released. When the engagement state between the locking portion 34B and the rotary engagement portion 35 is released, the cover 31 is separated from the upper case 30. Meanwhile, the external force does not damage the rotation support mechanism because the structure acts only to bend the elastic piece.

(6) Effects of the Invention As described above, according to the present invention, the dustproof set in the device body,
When setting the cover for soundproofing, etc., by inserting the projection of the cover with the image of inserting it with the image of the gap between the elastic piece and the pivotal engagement portion, the bending of the elastic piece that bends is used. It is possible to set with an allowable range, and in the setting process, due to the restoring force of the elastic piece,
Since the cover protrusion can be reliably positioned on the rotary engaging portion having the function of the rotary shaft, the setting operation is easy, and the set cover can be easily moved by the elastic piece during the rotation process.
It is possible to smoothly perform the opening / closing operation in a stable state with the turning shaft as a fulcrum while preventing the detachment. In addition, by utilizing the bending property of the elastic piece, the total thickness of the cover protrusion is made larger than the gap amount, and further, the cover is engaged and supported in the cover rotating direction, and an overload is applied in the rotating direction. Since the structure works only to bend the elastic piece even if applied, it is possible to provide a reliable cover opening / closing mechanism without being damaged. Further, if the structure is such that the cover can be elastically held at a certain angle after the cover has been opened as in this embodiment, the cover can be easily opened and closed, which is convenient for performing two-handed work in that state, and further, can be formed at low cost. Therefore, each component forming the cover opening / closing mechanism can be integrally molded with the casing forming the main body of the device including the elastic piece and the like, which has various practical effects.

[Brief description of drawings]

1 to 7 show an embodiment of the cover opening / closing mechanism of the present invention. FIG. 1 is a perspective view including an enlarged view of a main part of an opening / closing support portion, and FIGS. 2 to 7 are covers and devices. FIG. 2 is a cross-sectional view showing a relationship with an upper case opening / closing support part which is a part of a housing forming a main body, and FIG. 2 shows a relationship between a cover inserted into the cover opening / closing support part and the opening / closing support part. FIG. 3 is a view showing a state in which the cover is inserted and set in the cover opening / closing support portion, FIG. 4 is a view in a state in which the cover is closed, FIG. 5 is a view in a state in which the cover has started to be opened, and FIG. FIG. 7 is a diagram showing a state in which the cover is completely opened, and FIG. 7 is a diagram showing a state in which an external force is further applied in the cover opening direction from the state shown in FIG. 8 to 11 are conventional examples showing the cover opening / closing support mechanism shown in each drawing. FIG. 8 shows the first conventional example, and FIG.
Is a perspective view of the main part, FIG. 8B is a view showing a cover setting method, FIG. 9 is a second conventional example, FIG. 9A is a perspective view of the main part, and FIG. FIG. 10 is a diagram for explaining the problems of the example, FIG. 10 shows a third conventional example, and FIG.
FIG. 10B is a perspective view of the main part, FIG. 10B is a diagram for explaining the problems of the example, FIG. 11 shows a fourth conventional example, and FIGS. 11A and 11B are formed on the device body side. The cover open / close support
FIG. 1 is a perspective view of an essential part showing an opening / closing engagement part formed on a cover.
FIG. 1C is a cross-sectional view for explaining the problem of the example. 30: upper case, 31: cover, 33: cover opening / closing support part 34: cover projection part, 34B: locking part 35: turning engagement part, 36: elastic piece, 37: side wall

Claims (1)

[Scope of utility model registration request] 1. A cover opening / closing device that is rotatable when a cover is set in the device body by one-way operation, wherein the device body has a rotation engagement portion and a rotation engagement portion. An elastic piece that has a gap and is arranged to face each other is installed, and the elastic piece is inserted into the cover through the gap and resists the elastic force of the elastic piece, and is engaged with and supported by the rotary engaging portion. A cover protrusion that is provided, and the cover protrusion has a portion that comes into contact with the elastic piece when a force acts on the rotary engagement portion in a disengagement direction. A characteristic cover opening / closing device.