JP3003023U - Overhead projector - Google Patents

Abstract

(57) [Abstract] [Purpose] By installing only one power switch, the lamp lid can be opened and the stage can be removed.
To provide an overhead projector that ensures that the power is turned off. [Structure] Since the rod portion 3 of the safety switch 2 is biased leftward by a spring in the switch operating member 5, when the stage 7 is detached, the contact portion between the arm portion 5c and the operating portion 8a. When the lamp lid 8 is opened with the fulcrum as a fulcrum, the contact portion between the arm 5b and the arm 6b of the intermediary lever 6 is moved as a fulcrum, and the safety switch 2 is turned off. There is.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an overhead projector having a safety switch mechanism.

[0002]

[Prior art]

 In a transmission type overhead projector, a light source lamp is provided in a main body having a document placement stage. If the lamp burns out during use, it is usually replaced by opening the lamp lid on the side of the main unit without removing the outlet. However, in that case, there is a risk of electric shock or burns, so the power switch is usually turned off at the same time when the lamp lid is opened. In addition, since the inside of the main body becomes hot when used, it is possible to ventilate it. Therefore, it is easy for dust to enter the inside of the main body and cleaning is required. This attachment of dust is conspicuous when the lamp is on, so the stage is often removed from the main body in that state. In this case as well, electric shock and burns may occur, so the power switch is turned off when the stage is removed.

[0003]

[Problems to be solved by the device]

 However, conventionally, a power switch that operates by opening and closing the lamp lid and a power switch that operates by attaching and detaching the stage are separately provided, which is a cost problem. The present invention has been made in view of such a problem, and the purpose thereof is to use only one power switch and remove the stage even when the lamp lid is opened. At times, it is to provide an overhead projector in which the power is surely turned off.

[0004]

[Means and Actions for Solving the Problems]

 In order to achieve the above object, an overhead projector of the present invention has a safety switch provided in a main body for opening and closing a power source, and a first operated part and a second operated part, both of which are operated. When the safety switch is turned on, the switch actuating member is used to close the power source, the stage having a document placement surface and detachably arranged on the upper part of the main body, and the first stage when the stage is mounted on the main body. A first operating member for operating the operated portion, a lamp lid provided on the side of the main body so as to be openable and closable, and a second operating member for operating the second operated portion when the lamp lid is closed. Is equipped with.

Further, preferably, the overhead projector of the present invention includes a safety switch having a rod portion for opening and closing a switch to close the power source by pushing the rod portion against a spring, and a swing switch in the main body. A switch actuating member that is movably mounted and has a first operated part and a second operated part in symmetrical positions with the rod part sandwiched between them, and a document mounting surface, and is detachably arranged on the upper part of the main body. And a first operating member configured to be integrated with the stage and operating the first operated portion via an intermediary member when the stage is mounted on the main body, and can be opened and closed on a side portion of the main body. And a second operating portion that is integrally formed with the lamp lid and that operates the second operated portion when the lamp lid is closed, the first operated portion and the The second operated part together When operated, the switch operating member pushes the rod portion to close the power supply.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. 1 to 3 are cross-sectional views of the main part of the main body of the overhead projector. FIG. 1 shows a usage state, FIG. 2 shows a state in which the lamp lid is opened, and FIG. 3 shows a state in which the stage is removed. Is shown. A switch operation room 1 is formed in the main body of the overhead projector. The outer wall 1a of the switch operation room 1 also serves as the side wall of the main body of the overhead projector. A safety switch 2 for opening and closing a power source is attached to an inner wall 1b of the switch operation room 1. The safety switch 2 is provided with a rod portion 3 for opening and closing the switch, and is biased to the left by a spring 4. The switch actuating member 5 has a shaft 5a and arm portions 5b and 5c, and the shaft 5a is fitted into an elongated hole 1c provided in a wall on the front side of the drawing, although not shown. Therefore, the switch actuating member 5 abuts on the tip end portion of the rod portion 3 and is movable in the left-right direction along the elongated hole 1c, and is also swingable about the shaft 5a.

A shaft 1d is planted on the wall surface forming the long hole 1c, and an intermediate lever 6 is pivotally attached to the shaft 1d. The intermediary lever 6 has a bent portion 6a and an arm portion 6b, and the tip of the arm portion 6b is in contact with the arm portion 5b of the switch operating member 5. The stage 7 having a document placing surface is detachably attached to the upper portion of the main body, penetrates the hole 1e provided in the upper wall of the switch operation chamber 1, and contacts the bent portion 6a of the intermediary lever 6. An operation unit 7a is provided. A lamp lid 8 having an operating portion 8a is pivotally mounted on the bottom wall of the switch operation chamber 1. When the lamp lid 8 is opened, a hand is inserted to mount a lamp for a light source (not shown). It can be exchanged.

FIG. 1 shows a usage state of the overhead projector. In this state, since the switch operating member 5 pushes the rod portion 3 against the spring 4 into the safety switch 2, the safety switch 2 2 has closed the power supply. When the lamp burns out in this state, the lamp lid 8 on the side of the main body is opened to replace the lamp. At this time, since the pressing force by the operating portion 8a is released, the switch operating member 5 is pushed by the rod portion 3 by the urging force of the spring 4, and the arm portion 5b abuts on the arm portion 6b of the intermediary lever 6. It is moved with the point that is Therefore, the switch operating member 5 is in the state shown in FIG. 2, the safety switch 2 is opened, and the power is turned off. In this state, for example, even if the cord is connected to the outlet, there is no concern about electric shock and the lamp can be replaced with peace of mind.

On the other hand, when the stage 7 is removed in the state of FIG. 1 in order to remove dust inside the main body, the operating portion 7a retracts from the hole 1e, so that the pressing force is released. Therefore, the switch actuating member 5 is pushed by the rod portion 3 by the urging force of the spring 4, and is moved around the contact portion between the arm portion 5c and the operating portion 8a as a fulcrum, and the arm portion 5b causes the arm of the intermediary lever 6 to move. When the portion 6b is pressed, the state shown in FIG. 3 is obtained. Therefore, the safety switch 2 is opened, the power is turned off, and the lamp is turned off. In this state, even if the cord is connected to the outlet, there is no risk of electric shock or burns, and the inside of the main unit can be cleaned.

Although the intermediary lever 6b is provided in the above embodiment, it is possible to omit this. In that case, an inclined surface portion may be provided at the distal end portion of the operation portion 7a, and the inclined surface portion may be brought into direct contact with the arm portion 5b. Further, it is not necessary that the operation portions 7a and 8a be integrally formed with the stage 7 and the lamp lid 8, and they may be movably attached to the main body side. In particular, in the case of the operating portion 8, the formation on the arm portion 5c of the switch operating member 5 is not hindered. Further, although the switch actuating member 5 is fitted in the elongated hole 1c by the shaft 5a, it may be pivotally attached to the tip end portion of the rod portion 3 so as to be swingable.

[0011]

[Effect of device]

 As described above, according to the present invention, even if there is only one safety switch, it can be operated even when the lamp lid is opened or the stage is removed, and the power can be turned off. Is possible, and the configuration is extremely simple, and the practical effect is extremely large.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention, showing a usage state.

FIG. 2 is a sectional view of the same main portion as FIG. 1, showing a state in which a lamp lid is opened.

FIG. 3 is a sectional view of the same main part as FIG. 1, showing a state in which the stage is removed.

[Explanation of symbols]

 1 Switch operation room 2 Safety switch 3 Rod part 4 Spring 5 Switch operating member 6 Intermediary lever 7 Stage 8 Lamp lid

Claims (6)

[Scope of utility model registration request] 1. A safety switch provided in the main body for opening and closing a power source, and a first operated portion and a second operated portion, wherein when the both are operated, the safety switch closes the power source. A switch actuating member, a stage having a document mounting surface and detachably arranged on the upper part of the main body, and a first operating member for operating the first operated portion when the stage is mounted on the main body. An overhead projector comprising: a lamp lid provided on a side portion of the main body so as to be openable and closable; and a second operating member for operating the second operated portion when the lamp lid is closed. 2. The overhead projector according to claim 1, further comprising an intermediary member disposed between the first operating member and the switch operating member. 3. The overhead projector according to claim 1, wherein the first operating member is formed integrally with the stage. 4. The overhead projector according to claim 1, wherein the second operating member is formed integrally with the lamp lid. 5. The safety switch has a rod portion for opening and closing the switch which is biased by a spring, the switch operating member is swingably attached to the rod portion, and the first operated portion and the The overhead projector according to any one of claims 1 to 4, wherein the second operation portion is provided in a substantially symmetrical position with the rod portion interposed therebetween. 6. A safety switch having a rod portion for opening and closing a switch to close the power source by pushing the rod portion against a spring, and a first operated portion swingably mounted in the main body. And a switch actuating member having a second operated portion at a symmetrical position with the rod portion sandwiched therebetween, a stage having a document placing surface and detachably arranged on an upper portion of the main body, and being integrated with the stage. A first operating member configured to operate the first operated portion via an intermediary member when the stage is mounted on the main body, a lamp lid openably and closably disposed on a side portion of the main body, and the lamp. A second operating portion that is integrally formed with the lid and that operates the second operated portion when the lamp lid is closed, and when both the first operated portion and the second operated portion are operated. The switch operating member pushes the rod portion to turn on the power source. An overhead projector characterized by being closed.