JPH11202407A - Double safety device for liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disable the entrance of an inlet from being opened by locking so that an interlocking member plugs the entrance of the inlet in a open state of a lit and moving easily the interlocking member by the hand, etc. SOLUTION: The device is provided with a 1st lock mechanism which locks so that the interlocking member 5 plugs the entrance of the inlet 3 when the lid 2 is detached and a 2nd lock mechanism which locks the 1st lock mechanism on the opening lower back face of a housing 1. Therefore, the entrance of the inlet 3 can not be opened even by unlocking the 1st lock mechanism and moving the interlocking member 5 without unlocking the 2nd lock mechanism, and electric power can not be supplied by plugging in the power connector 4a of a power cord, thereby even when fingers are inserted at the time of the replacement of a lamp, etc., neither an electric shock the due to a tough on a power-fed part nor heat injury due to the illumination of the lamp is caused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double safety device for a liquid crystal projector, and more particularly to a device for preventing electric shock when opening and closing a cover disposed near a power supply unit such as when replacing a lamp.

[0002]

2. Description of the Related Art Conventionally, a top part and a back part of a housing are opened, and a substantially L-shaped lid comprising a top plate and a side plate is removably mounted in the opening, and a lamp is provided in the housing. , A power supply unit, etc., are housed therein. An inlet is attached to the device unit, and a power connector attached to an end of a power cord is attached to and detached from the inlet through an opening provided at a lower rear portion of the housing. It is mounted freely and supplies power to the device section,
When the power connector is attached to the inlet, the lid is locked by an interlocking member so as not to be opened, and when the lid is open, the inlet of the inlet is closed by the interlocking member so that the power connector cannot be attached to the inlet. Safety devices have been considered. However, in this configuration, the inlet can be opened by turning or sliding the interlocking member by hand or the like with the lid open, so that the user can connect the power cord to the inlet. However, there is a problem in that the power supply connector attached to the end of the power supply can be mounted to supply power, and there is a risk of electric shock.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. When the lid is removed, the interlocking member is locked with the inlet of the inlet closed, and the interlocking member can be easily operated by hand or the like. It is an object of the present invention to provide a double safety device for a liquid crystal projector which cannot move to open an inlet of an inlet.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention opens a part of a top surface and a back surface of a housing, and has a substantially L-shaped top plate and a side plate in the opening. A lid is detachably mounted, and a device portion such as a lamp and a power supply portion is housed in the housing. An inlet is mounted on the device portion, and the inlet is provided through an opening provided at a lower rear portion of the housing. A power connector attached to the end of the power cord is detachably attached to supply power to the device, and the lid is locked by the interlocking member and does not open when the power connector is attached to the inlet. In the liquid crystal projector in which the lid is opened, the inlet of the inlet is closed by an interlocking member so that the power connector cannot be attached to the inlet.
A first lock mechanism that locks in a state where the interlocking member closes the inlet of the inlet when the lid is removed, and a second lock mechanism that locks the first lock mechanism; If the second lock mechanism is not released, the first lock mechanism is released to move the interlocking member so that the inlet of the inlet cannot be opened.

[0005] The lid is provided with a second lock release section for releasing the second lock mechanism, and a first lock release section for releasing the first lock mechanism. And the first lock mechanism is sequentially released so that the interlocking member opens the inlet of the inlet.

The interlocking member is formed of a slide plate having a guide hole corresponding to a guide pin of a guide plate fixed to the back of the lower portion of the opening of the housing and slidable up and down. A double safety device for the energized liquid crystal projector.

The first locking mechanism forms a locking surface by bending an upper end of the guide hole of the sliding plate inward,
A lock portion bent upward to form a substantially Z-shape;
The tip of the guide plate is bent outwardly (in a direction away from the sliding plate) in a substantially Z-shape facing the lock portion, and both sides of the upper vertical surface are bent inward to form a bearing portion. A rotatable seesaw plate formed with a claw for locking a sliding plate by abutting one end against the lock surface on the bearing portion, and the claw is biased against the sliding plate by a coil spring to be rotatable. A double safety device for a liquid crystal projector consisting of a seesaw section.

The second lock mechanism forms a slit in a lock surface formed by bending an upper end of the guide hole of the slide plate inward, and inserts the claw portion into the slit. A double safety device for a liquid crystal projector.

The second unlocking portion is provided with a second projection for releasing the second locking mechanism by temporarily pressing the sliding plate against the top plate of the lid to release the claw portion from the slit. This is a double safety device for a liquid crystal projector.

[0010] The first unlocking portion extends the other end of the seesaw plate (the side opposite to the claw portion) to provide a releasing portion, and presses the releasing portion on the side plate of the lid to move the claw portion from a horizontal plane. A double safety device for a liquid crystal projector comprising a first projection for removing and releasing the first lock mechanism.

An L-shaped rib for sandwiching the top surface of the housing is provided on the back surface of the top plate of the lid, and a lid lock portion formed on the top plate at the upper end of the slide plate is stored between the top plate and the side plate. Then, a third projection to be locked was formed.

The third projection is formed integrally with the second projection.

[0013] The lid lock portion is formed by bending the leading end of a sliding plate into an L-shape.

[0014]

As described above, in the double safety device for a liquid crystal projector according to the present invention, when the lid is detached, the interlocking member closes the inlet of the inlet when the lid is removed. And a second lock mechanism for locking the first lock mechanism. Therefore, if the second lock mechanism is not released,
The first lock mechanism is released to move the interlocking member, so that the inlet of the inlet cannot be opened, and the power cord connector cannot be mounted to supply power.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a double safety device for a liquid crystal projector according to the present invention. FIG. 1 is a schematic external view of a liquid crystal projector according to the present invention. In the figure, reference numeral 1 denotes a housing in which a top surface 1a and a part of a back surface 1b are opened,
2 is detachably attached to the opening, and the top plate 2a and the side plate 2
b is a lid 2 substantially on an L-shape. Inside the housing 1, devices (not shown) such as a lamp and a power supply unit are housed, and an inlet 3 is mounted on the device, and the housing 3 is provided corresponding to the inlet 3. Opening lower back 1
b, an inlet opening 1b1 is formed. A power cord 4 is connected to the inlet 3 through the inlet opening 1b1.
The power supply connector 4a attached to the end of the device is attached to supply power to the device. A sliding plate 5 for locking the lid 2 faces the inlet opening 1b1, and a knob 6 for opening the lid 2 is attached to the sliding plate 5, which corresponds to the knob 6. An opening 1b2 for a knob is formed on the lower surface 1b of the housing 1 at the lower part of the opening.

FIG. 2 is a view showing one embodiment of a double safety device for a liquid crystal projector according to the present invention, and FIG. 2A is a view of the rear surface 1b of the housing with the lid 2 removed, as viewed from the inside. Figure 2
(B), (C) is the perspective view of the principal part seen from the front. As shown in the figure, the sliding plate 5 is urged upward by a coil spring 9, and a guide hole 5a is guided by a guide pin 7a provided on the guide plate 7 so as to be slidable up and down. The opening 1b1 is opened and closed. And, at the upper end thereof, an L for locking the lid 2 is provided.
A lid lock portion 5b bent in a letter shape is provided.

FIG. 3 is a sectional view of an essential part showing an embodiment of a double safety device for a liquid crystal projector according to the present invention.
3A shows a state in which the lid 2 is mounted, and FIG. 3B shows a state in which the lid 2 is removed. As shown in FIG. 3A, an L-shaped rib 2a1 for holding the top surface 1a of the housing 1 is provided on the back surface of the top plate 2a of the lid 2 at the front end. A second projection 2a2 is provided on the top plate 2a of the lid 2, and when the lid 2 is mounted, the lid locking portion 5b of the sliding plate 5 is once pushed down to activate a second locking mechanism described later. At the same time, the lid lock portion 5b of the slide plate 5 is stored between the slide plate 5 and the side plate 2b. The side plate 2b of the lid 2 is provided with a first protrusion 2b1 for pushing up a release portion 8b described later to release the first lock mechanism.

A guide mounting portion 1b3 is provided on the back surface of the opening lower rear surface 1b of the housing 1, and a guide plate 7 on which the sliding plate 5 slides is fixed to the guide mounting portion 1b3. The guide plate 7 is provided with a guide pin 7a for guiding the guide hole 5a of the slide plate 5. Then, the upper end of the guide plate 7 is bent outward,
It is further bent upward to form a substantially Z-shape, and its vertical surface 7
b, a bearing portion 7c is provided, and the seesaw plate 8 having a claw portion 8a and a release portion 8b is supported by the bearing portion 7c. The seesaw plate 8 pushes up the claw portion 8 a with a coil spring or the like so as to abut the sliding plate 5.

The upper end of the sliding plate 5 is bent inwardly opposite to the guide plate 7 to form a lock surface 5c, and further bent upward to form a substantially Z-shape. A first locking mechanism is formed. The locking surface 5c has a slit 5c1 to which the claw portion 8a is attached and locked.
To form a second lock mechanism.

The operation of the above configuration will now be described. FIG. 3 is a sectional view of an essential part showing an embodiment of a double safety device for a liquid crystal projector according to the present invention, as described above. FIG.
Indicates a state where the lid 2 is removed. In the state in which the lid of FIG. 3A is covered, the sliding plate 5 is urged by the coil spring 9 to move upward, opening the inlet opening 1b1, and
Power can be supplied to the device by attaching the power connector 4a of the power cord 4 to the inlet 3. In this state, since the lower end of the sliding plate 5 hits the power connector and cannot be pushed down by operating the knob 6, the lid lock portion 5b blocks the movement of the second protrusion 2a2 and the lid 2 can be removed. I cannot do it. When the power connector 4a of the power cord 4 is not attached to the inlet 3, the sliding plate 5 can slide freely, and when the knob 6 is pressed down, the sliding plate 5 moves downward. When the lock portion 5b is pushed down, the second protrusion 2a2
Can be removed by moving the lid 2 horizontally without being blocked by the lid lock portion 5b.

When the lid 2 is removed while the knob 6 is being pushed down, the seesaw plate 8 is urged by a spring to rotate, and the claw portion 8a is rotated.
Is brought into contact with the sliding plate 5, and when the knob 6 is released, the claw portion 8a is inserted into the slit 5c1 provided on the lock surface 5c of the sliding plate, and the sliding plate 5 does not move upward any more. The opening is locked with the sliding plate 5 closed. Therefore, even if the slide plate is moved up and down by operating the knob, the claw 8a does not come off the slit 5c1, so that the inlet opening is not opened, and the power supply connector 4a cannot be attached to the inlet 3.

Next, to attach the lid, the top plate 2 of the lid 2
a is aligned with the opening of the housing 1, the second protrusion 2a
2 pushes down the lid lock portion 5b at the upper end of the sliding plate,
The nail 8a comes off the slit 5c1. Further, when the lid 2 is moved in the horizontal direction and the rib 2a1 is inserted into the back surface of the top surface 1a of the housing 1, the first projection 21 pushes up the release portion 8b to move the pawl from the lock surface 5c of the slide plate 5 to the claw. Since part 8a is removed,
The sliding plate 5 is urged by the coil spring 9 to move upward, the lid lock portion is housed between the second protrusion 2a2 and the side plate 2b, and the lid 2 is locked.

[0023]

As described above, according to the double safety device for a liquid crystal projector according to the present invention, when the lid is removed, the interlocking member closes the inlet of the inlet when the lid is removed. And a second lock mechanism for locking the first lock mechanism. Therefore, if the second lock mechanism is not released,
Since the first lock mechanism is released and the interlocking member is moved, the inlet of the inlet cannot be opened and the power cord connector cannot be attached to supply power, so that when the lamp is replaced, Even if you insert your fingers inside, there is no risk of electric shock by touching live parts and no burns due to lighting of the lamp. Further, a second lock release section for releasing the second lock mechanism and a first lock release section for releasing the first lock mechanism are provided on the lid, and when the lid is attached, the second lock mechanism is provided. Since the first lock mechanism is sequentially released and the interlocking member opens the inlet of the inlet,
The attachment and detachment of the lid is easy.

[Brief description of the drawings]

FIG. 1 is a schematic external view of a liquid crystal projector according to the present invention.

FIG. 2 is a view showing an embodiment of a double safety device for a liquid crystal projector according to the present invention, wherein FIG. 2 (A) is a view of the rear surface 1b of the housing with the lid 2 removed, as viewed from the inside, (C) is a perspective view of a main part viewed from the front.

FIG. 3 is a sectional view of an essential part showing an embodiment of a double safety device for a liquid crystal projector according to the present invention. FIG. 3- (A) shows a state in which a lid 2 is mounted, and FIG. This shows a state where the lid 2 is removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 1a Top surface 1b Back surface 1b1 Inlet opening 2 Lid 2a Top plate 2a1 Rib 2a2 Second projection 2b Side plate 2b1 First projection 3 Inlet 4 Power cord 4a Power connector 5 Sliding plate 5a Guide hole 5b Cover Lock portion 5c Lock surface 5c1 Slit 6 Knob 7 Guide plate 7a Guide pin 7b Vertical surface 7c Bearing portion 8 Seesaw plate 8a Claw portion 8b Release portion 9 Coil spring

Claims (10)

[Claims] 1. A top part and a part of a back side of a housing are opened, and a substantially L-shaped lid comprising a top plate and a side plate is removably attached to the opening, and a lamp and a power supply are provided in the housing. The power supply connector attached to the end of the power cord through the opening provided in the lower part of the back of the housing is detachably attached to the inlet. When the power supply connector is attached to the inlet, the lid is locked by an interlocking member so that the lid is not opened when the power supply connector is attached to the inlet. In a liquid crystal projector in which the power supply connector cannot be attached to the inlet by closing the inlet, the interlocking member closes the inlet of the inlet in a state where the lid is detached on the lower back of the opening of the housing. A first lock mechanism that is locked in a state and a second lock mechanism that locks the first lock mechanism are provided, and if the second lock mechanism is not released, the first lock mechanism is released. Wherein the interlocking member is moved so that the inlet of the inlet cannot be opened. A second lock release section for releasing the second lock mechanism and a first lock release section for releasing the first lock mechanism, wherein the lid is provided with a second lock release section; 2. The double safety device for a liquid crystal projector according to claim 1, wherein the lock mechanism and the first lock mechanism are sequentially released so that the interlocking member opens the inlet of the inlet. 3. The interlocking member is formed of a slide plate having a guide hole corresponding to a guide pin of a guide plate fixed to the back of the lower part of the opening of the housing and sliding up and down, using a spring or the like. The double safety device for a liquid crystal projector according to claim 1, wherein the safety device is biased upward. 4. The first lock mechanism forms a lock surface by bending an upper end of a guide hole of the slide plate inward, and further forms a substantially Z-shape by bending upward. And the leading end of the guide plate is bent outwardly (in a direction away from the sliding plate) in a substantially Z-shape facing the lock portion, and both sides of the upper vertical surface are bent inward. A bearing is formed, and a seesaw plate having a claw for locking the sliding plate with one end of the bearing abutting against the locking surface is pivotally supported, and the claw is attached to the sliding plate with a coil spring. 4. A double safety device for a liquid crystal projector according to claim 3, wherein the device comprises a seesaw portion which is rotatable and rotatable. 5. A slit is formed in a lock surface formed by bending an upper end of a guide hole of the slide plate inward, and the claw portion is inserted into the slit. 5. The dual safety device for a liquid crystal projector according to claim 4, wherein 6. A second projection for releasing the second lock mechanism by temporarily pressing the sliding plate against a top plate of the lid to release the claw from the slit. 6. The double safety device for a liquid crystal projector according to claim 2, further comprising: 7. The first unlocking portion extends the other end (opposite to the claw portion) of the seesaw plate to provide a releasing portion, and pushes the releasing portion against the side plate of the lid to thereby engage the claw portion. 5. The double safety device for a liquid crystal projector according to claim 2, further comprising a first protrusion for releasing the first lock mechanism by removing the first lock mechanism from a horizontal plane. 8. An L-shaped rib for sandwiching a top surface of a housing is provided on a rear surface of a top plate front end of the lid, and a lid lock portion formed on an upper end of the slide plate is provided between the top plate and a side plate. 3. The double safety device for a liquid crystal projector according to claim 1, wherein a third projection is formed to be housed and locked. 9. The double safety device for a liquid crystal projector according to claim 6, wherein the third projection is formed integrally with the second projection. 10. The double safety device for a liquid crystal projector according to claim 8, wherein the lid lock portion is formed by bending an end of a slide plate into an L-shape.