CN1240899A - A safety device when a lamp falls over - Google Patents

Abstract

A safety device for the falling-down of lamp is composed of a falling-down safety switch with conic cavity electrode, cylindrical cup electrode and metal ball between them for connecting or disconnecting them, and an electronic circuit unit with voltage-reducing unit, rectifying unit, voltage-stabilizing unit, transistor unit and relay for electronic switch according to the on/off signals of said switch. When the switch is tilted to a critical angle, it is turned on, causing the relay to function. The device of the present invention is simple and compact and can be mounted on any part of the floor lamp with very low cost.

Description

A safety device when a lamp falls over

The present invention relates to a safety device, in particular to a safety device which can automatically cut off the power supply to avoid accidents when a lamp is toppled over, and which can meet the safety requirements for toppling in the new UL standard (153) which will come into effect in January 1999 Switches and corresponding electronic circuit units.

In CN97120142.0 (U.S. Patent No. 08/972.416), a fire-resistant floor-mounted halogen lamp is disclosed, which is equipped with a grid, a heat sensor and a light sensor, and can be automatically cut off when the sensor detects a predetermined value. The electronic circuit system of the power supply is also equipped with a mechanical switch that can cut off the power supply when the lamp is tilted to a predetermined angle.

The primary disadvantage of the above-mentioned prior art switches for dumping is that, since this type of mechanical switch is located on the underside of the base and must make reliable contact with the ground, the usual installation of the power switch in such a position would violate the Any "safety regulations". In addition, if the above switch is used to directly cut off the power, since it is necessary to disconnect the wires in the power cord at such a low position for connection to the switch, strain relief must be provided on both sides of the switch. Also since the ground is often splashed with water, the connections themselves (which are also very close to the ground) should be insulated with a water-resistant grade of material.

A second disadvantage of this prior art mechanical switch is that, even if said switch is used to cut off a signal circuit, since the travel of the plunger of such a mechanical switch has a fixed value, it is not possible to use one design for all. Lamp type. For example, even if the switch is centered in the base, if the diameter of the base changes, the angle of inclination will vary due to the fixed stroke of the switch plunger.

A third disadvantage is that if this floor mounted halogen lamp equipped with a prior art switch is continuously pushed/pulled by a child to make the switch on/off continuously for a short period of time, the switch will be struck immediately wear. The reason is that any switch is designed for less than 50 on/off cycles in one hour, not one minute.

Therefore, it will bring a lot of troubles to manufacture new or transform old vertically placed lamps to meet the safety requirements of the new UL-153 when using the above-mentioned safety switch when toppling in the prior art.

An object of the present invention is to provide a vertically placed lamp, whose improved design structure not only improves the working safety, reduces the risk of fire, but also avoids such as being affected by children's dragging etc. life.

Yet another object of the present invention is to provide a safety device, the safety switch of which has an improved structure that can reliably operate when the lamp is toppled over, without being limited by installation conditions.

Another object of the present invention is to provide a safety device whose electronic circuit system can automatically cut off the power supply to the lamp tube when the lamp is tipped out of its normal position.

In order to achieve the above-mentioned purpose of the present invention, a safety device for lamps when tipping is proposed, which is realized through the following technical solutions.

A safety switch when a lamp falls over, which includes: a tapered chamber electrode with a tapered slope at the lower part and a cylindrical cup electrode with a cylindrical inner wall at the upper part, which are arranged with a certain gap in the vertical direction and have the same inner diameter as each other; A metal ball that connects the upper and lower electrodes.

An electronic circuit unit corresponding to the above-mentioned safety switch when the lamp falls over includes a decompression unit, a rectification unit and a voltage stabilization unit, wherein the electronic circuit unit also includes:

a transistor;

A fall-time safety unit, the fall-time safety switch is respectively connected between the voltage stabilizing unit and the base of the transistor through resistors; and

A relay that acts as an electronic switch according to the on/off signal of the switch, the coil of the relay is connected in series with the collector of the transistor, and the normally closed contact of the relay is directly connected in parallel with the lighting fixture after being connected in series Both ends of the AC power supply.

A safety switch when a lamp is toppled, which includes: two tapered cavity electrodes with the same external shape and a tapered inclined surface arranged with a certain gap in the horizontal direction, and a metal ball that acts as a connection between the electrodes.

An electronic circuit unit corresponding to the above-mentioned safety switch when the lamp falls over includes a high-power thyristor functioning as an electronic switch, wherein:

The safety switch in case of dumping and a low-power thyristor connected in series are connected across the power supply and the base of the high-power thyristor.

Brief description of the attached drawings:

Fig. 1 is a sectional view showing a floor lamp in the prior art provided with a safety switch when the lamp is tilted to a preset angle, and the safety switch is used to directly cut off the power supply;

Fig. 1A is an enlarged sectional view of the safety switch in Fig. 1 when toppling over;

Fig. 2 is an enlarged structural schematic diagram of the safety switch used for the lamp shown in Fig. 1 when it is dumped;

Fig. 2A is a schematic diagram illustrating the circuit and safety switch of the lamp when the lamp is in the normal position;

Fig. 2B is a schematic diagram illustrating the circuit of the lamp and the safety switch when the lamp is placed away from the normal position;

Figure 3 is a cross-sectional view of a fall-over safety switch of the present invention showing all components used to form the switch;

Fig. 4 is the arbitrarily selected outer profile of the tapered cavity electrode used in the present invention;

Figure 5 is a cross-sectional view of yet another safety switch of the present invention showing all the components used to form the switch;

Fig. 5A is a cross-sectional view along the A-A direction of the safety switch shown in Fig. 5 when it is toppled;

Fig. 6 is a circuit diagram of a preferred embodiment of the safety device of the present invention, showing the connection of the safety switch of the present invention in a conventional transistor/relay circuit unit;

Fig. 7 is a circuit diagram of another preferred embodiment of the fall-over safety device of the present invention, showing the connection of the fall-over safety switch of the present invention in a traditional high-power thyristor circuit unit.

The above objects and other advantages of the present invention will be more clearly described through the following description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

Referring to Fig. 1 and Fig. 1A, in the accompanying drawings, a tipping safety switch 1 is provided on the bottom side of the base 11 of the floor-standing halogen lamp 10, and the tipping safety switch 1 is directly connected with the incoming power line 12, and its structural diagram is shown in Fig. 2 As shown, the switch 1 is a normally open switch with a lever actuator arm 21, the arm 21 is biased by a spring 14 in the open position, the contacts 19 and 20 of the switch 1 are separated; when the lamp base 11 rests on the solid surface 18 When the lamp works in the normal position, the transmission arm 21 moves upward due to the upward supporting force, that is, the contact arm 17 moves upward, compresses the bias spring 14, and closes the contacts 19 and 20; thus, the lamp will In working condition, as shown in Figure 2A. When the lamp is tilted at a certain angle, the contact arm 17 is biased downward due to the elastic force of the spring 14, so that the contacts 19 and 20 are disconnected, so that the switch 1 is in the normally open state, and the lamp will stop working, as shown in the figure 2B. When the lamp returns to its usual upright position again, the lamp will start working again. Obviously, in order to fix the safety switch of the prior art on the bottom side of the base 11, the lamp 10 must also be equipped with brackets, levers, springs, etc., and in practice, although the stroke of the switch 1 is constant, the It varies with its position on the base 11 and the direction of inclination.

And, as shown in Figure 1, when a glass of water is accidentally spilled on the ground, the switch will immediately be soaked in water. In addition, since the stroke of the switch transmission part is constant, different critical surfaces will appear when the same switch is installed on floor lamps with different base diameters. In addition, when such a switch is installed in the base, the counterweight will be uneven, which reduces the stability of the floor lamp, and may cause the floor lamp to have different inclination angles along different directions. Finally, since the conventional switch can only pass the on/off test at a frequency of 50 times per hour, this open tube cannot withstand continuous on/off operations in a short period of time.

Please refer to FIG. 3 for a cross-sectional view of the safety switch 1 when toppling over according to the present invention. The conical cavity electrode 31 with the same inner diameter and the lower part with a conical slope and the upper cylindrical cup electrode 35 with a cylindrical inner wall are arranged with a certain gap 45 in the vertical direction, wherein the lower conical electrode made of brass for the commutator The cavity electrode 31 has a conical cavity top surface 311 for receiving the metal ball 32 and an axial screw hole 39 for receiving the terminal screw 33 with the connecting ring 34, which can be made of brass for the commutator. The cup electrode 35 has a cylindrical wall portion 351 slightly larger than the metal ball 32 and an axial screw hole 38 for receiving the terminal screw 36 with the connecting ring 37 . The lower electrode 31 and the upper electrode 35 are firmly sealed in place by a plastic sleeve 40 to form an integral assembly.

Here, the angle between the top surface 311 of the preferably defined tapered cavity and the horizontal plane is 20°. This is slightly blunt compared to the 120° apex angle of a standard twist drill. Therefore, any twist drill can be ground to a vertex angle of 140° to process the lower tapered cavity electrode 31 in one drilling process.

For ease of assembly, the outer contours of the above two electrodes 31 and 35 can be made as shown in FIG. 4 . Thus, once tightly fitted, the plastic sleeve 40 will never disengage from the two poles. The metal ball 32 is preferably made of the same material as the lower electrode 31 among the two electrodes. If a steel ball is used, it is preferably plated with the same material as the lower electrode 31 or chrome-plated in order to prevent corrosion due to electrochemical reaction.

When the safety switch 1 is tilted to a critical angle in any direction during the toppling, the top surface 311 of the conical cavity in this direction will be parallel to the horizontal plane. Therefore, a slightly larger inclination angle can make the metal ball 32 roll outwards. Until stopped by the aforementioned upper cylindrical cup electrode 35 , in this position, the metal ball is in contact with both the conical cavity electrode 31 and the cylindrical cup electrode 35 at the same time, so that the two electrodes are connected. Therefore, the safety switch 1 during fall of the present invention shown in FIG. 3 is a switch in which the first state is off and the second state is conductive.

It is extremely simple to install the safety switch 1 of the present invention in any printed circuit board PCB. The only thing to do is to replace the two connecting rings 34, 37 with "9" shaped wires, and insert their straight parts into the pre-made holes on the PCB, and then solder. Then the above-mentioned terminal screws 33, 36 are screwed into the screw holes 39 and 38 of the two electrodes 31, 35 through the "0" shaped part of the "9" shaped wire. Naturally, other devices such as brackets, casings, etc. can also be used to install the above-mentioned safety switch 1 at any position of the lamp when falling over.

Fig. 6 is a preferred embodiment of the electronic circuit unit corresponding to the safety switch when the lamp is toppled when the first state is off and the second state is conductive in the present invention. In the preferred embodiment of the present invention, its control part first uses a decompression capacitor C1 (105/250V) in series with an output end of the AC power supply AC (120V, 60HZ), and then the output end of the decompression capacitor C1 Then it is connected to the input end side of the rectification circuit composed of diode D1 (or its array). Then the output side of the rectifier D1 is parallel connected with a Zener diode Z1, and then the capacitor C2 is parallel connected to both ends of the Zener diode Z1 as a filter capacitor; 1 Connect the positive side of the Zener diode Z1 and the base B of the transistor Q1 through the resistor R1 (1K 1/4W) and the resistor R2 (10K 1/4W) respectively; a relay coil W is connected across the Zener diode The positive side of Z1 and the collector C of transistor Q1; at the same time, there is capacitor C3 (220mmF/25V) together with the above-mentioned resistor R2 (10K 1/4W) and emitter E of transistor Q1 to form a 30-second delay circuit unit. In addition, after the normally closed contact J1 of the relay is connected in series with the lighting fixture, it is then connected to the AC power supply.

In FIG. 6, the voltage output from the AC power supply AC is reduced to an appropriate voltage such as 12V by the decompression capacitor C1, rectified by the rectifier D1, and then input to the capacitor C2 after being stabilized. Once the lamp falls over, the above-mentioned safety switch 1 of the present invention is turned on, and then the above-mentioned stabilized voltage is biased to the base B of the transistor Q1 (CS9014C) through the safety switch 1 during the fall to make the Transistor Q1 is turned on. The collector circuit will excite the relay coil, causing the normally closed contact J1 of the relay to be disconnected, thereby cutting off the power supply to the floor lamp. In the figure, once the switch K returns to the off state, R2 (10K/0.25N) and C3 (220mmF/25V) constitute a 30-second delay circuit system. If the resistance of R2 changes, the delay time will also change. This feature can be used to prevent children from continuously pushing/pulling the floor lamp to make it shake.

Fig. 5 is a diagram of another preferred safety switch when the lamp is toppled according to the present invention. In this embodiment, the two electrodes 51 and 51' of the switch can be arranged in the same semi-cylindrical shape and at the same time the tops 511 and 511' of the switch can be arranged in a conical slope. In use, the two electrodes 51 and 51' are relatively fixed in the plastic envelopes 40 and 40' with a certain gap 53 in the horizontal direction, and the inner diameter of the tapered part of the semi-cylindrical electrode should be set to be larger than that of the metal electrode. The diameter of the ball makes the metal ball roll in the conical cavity of the semicircular electrode; when the lamp is in the normal position, the metal ball 32 is placed at the bottom of the conical slope 511 and 511', that is, at the center of the two opposite electrodes , and connect the two electrodes 51 and 51'. When the lamp is tilted in any direction to reach a critical angle, the conical slopes 511 and 511' of the electrode in this direction will be parallel to the horizontal plane. Therefore, a slightly larger inclination angle can make the metal ball 32 roll outward until it is moved along The protruding parts 512 or 512' provided on the outer circumferences of the two electrodes prevent the safety switch 1 of this embodiment from being turned off when falling. In addition, the tapered edge of the electrode of the present invention should also be partially provided with insulating parts 54 and 54' to ensure that when the metal ball 32 rolls a certain distance along the gap 53, the safety switch 1 can also be disconnected, thereby ensuring The switching device is effectively open when tipped in any direction, as shown in Figure 5A. It can be seen that the fall safety switch 1 shown in this embodiment is a switch that conducts electricity in the first state and cuts off electricity in the second state.

Same as the embodiment shown in Fig. 3, the two electrodes 51 and 51' in Fig. 5 are also preferably made of brass material for the commutator, and the metal ball 32 is preferably made of the same material as the two electrodes 51 and 51'. made of materials. If adopt steel ball, in order to prevent the erosion that electrochemical reaction causes, it is preferably plated with the same material as electrode 51 and 51 ' or it is chrome-plated.

And Fig. 7 shows a preferred embodiment of the electronic circuit unit corresponding to the safety switch when the lamp in the first state conducts and the second state cuts off the power of the present invention. In this embodiment, the thyristor element TH1 connected in series with the lighting lamp is used as an electronic switch to control the on/off of the lamp; and the safety switch 1 of the present invention is connected to the thyristor through resistor R5 and DB1 component TH1 and both ends of the power supply. When the lamp is in the normal position, the voltage is applied to the base of the thyristor element TH1 through the closed safety switch 1, which triggers TH1 and lights up the lamp; if the lamp falls over, the safety switch shown in Figure 5 is immediately disconnected , cut off the power supply to the lamp.

In summary, adopting the vertical light fixture and its safety device of the present invention, firstly because the safety switch 1 is very compact and easy to be installed in any place such as light poles, lampshades, etc., so this switch can be installed The safety of using the safety switch of the present invention is improved to a place away from the base and the ground. Secondly, since the electronic circuit part of the safety switch K can be incorporated into the PCB of the electronic dimmer, and since any electronic dimmer already has a decompression capacitor, a rectifier and a Zener diode, etc., only the transistor Q1 is needed and some simple components to realize the electronic circuit system of the present invention. Therefore, the cost of implementing the present invention is very low. Furthermore, since all the components used in the tip-over safety switch of the present invention are extremely simple and easy to manufacture, for example the electrodes of the present invention are designed to be manufactured from brass rods in an automatic lathe and the plastic sleeves, terminal screws and connecting rings It can be purchased from the market, so it can have high productivity. Finally, since the critical tipping angle is now set in the cutout by the apex angle of the electrodes of the conical cavity, this cutout when tipping can be used for any floor lamp with different base sizes and pole heights middle.

Although the above-mentioned safety switch when falling is used in vertically placed lamps, it should be understood that after appropriate deformation, the safety switch and its electronic circuit unit in the above-mentioned preferred embodiments of the present invention can also be used in other falling In areas where insurance is required from time to time.

Although the above-mentioned preferred embodiments of the present invention have been listed here, it should be understood that any technical deformation and change made by those skilled in the art without departing from the spirit of the present invention should fall within the scope of the present invention. within the scope of protection required by the claims.

Claims (22)

1. A safety switch when a lamp is toppled, characterized in that the safety switch when toppled comprises: a conical cavity electrode with a conical inclined surface at the lower part and a barrel with a barrel at the upper part, which are arranged with a certain gap in the vertical direction and have the same inner diameter as each other. A cylindrical cup electrode with a shaped inner wall and a metal ball connecting between the upper and lower electrodes. 2. The safety switch when the lamp is tilted according to claim 1, characterized in that the slope of the electrode in the conical cavity has an inclination angle with the horizontal plane. 3. The safety switch when the lamp is toppled according to claim 2, characterized in that the inclination angle between the slope and the horizontal plane preferably does not exceed 20°. 4. The safety switch when the lamp is toppled according to claim 1, characterized in that the cylindrical cup electrode has a cylindrical wall, and the inner diameter of the cylindrical wall is slightly larger than the metal ball diameter of. 5. The safety switch when the lamp is toppled according to claim 1 or 2 or 3 or 4, characterized in that the safety switch when toppled is a safety switch that cuts off power in the first state and conducts electricity in the second state. 6. A safety switch when a lamp is toppled, characterized in that the safety switch when toppled includes: two tapered cavity electrodes with the same external shape and a tapered inclined surface arranged with a certain gap in the horizontal direction and A metal ball that acts as a connection between electrodes. 7. The safety switch when the lamp is toppled according to claim 6, characterized in that the slopes of the electrodes in the two conical chambers have an inclination angle to the horizontal plane. 8. The safety switch when the lamp is toppled according to claim 7, characterized in that the inclination angle between the slopes of the electrodes in the two conical chambers and the horizontal plane is preferably no more than 20°. 9. The safety switch when the lamp is toppled according to claim 6, wherein the electrode is preferably semi-cylindrical, and the inner diameter of the tapered part should be set larger than the diameter of the metal ball. 10. The safety switch when the lamp is toppled according to claim 9, wherein a protrusion is preferably arranged along the outer circumference of the semi-cylindrical electrode. 11. The safety switch when the lamp falls over according to claim 6 or 7 or 8 or 9 or 10, characterized in that the edge of the electrode cone is insulated from the end to the center. 12. The safety switch when the lamp falls over according to claim 6 or 7 or 8 or 9 or 10, characterized in that the safety switch when falling over is a safety switch that conducts electricity in the first state and cuts off power in the second state. 13. The safety switch when the lamp falls over according to claim 1 or 6, characterized in that the safety switch when falling over can be installed at any position of the structure of the lamp itself including the printed circuit board. 14. The safety switch when the lamp is toppled according to claim 1 or 6, characterized in that the electrodes are preferably made of brass for the commutator. 15. The safety switch when the lamp is toppled according to claim 1 or 6, characterized in that the metal ball in the safety switch when toppled is preferably made of the same material as the electrodes of the conical cavity. 16. The safety switch when the lamp is toppled according to claim 1 or 6, characterized in that the metal ball in the safety switch when toppled is made of a material different from that used for the electrodes of the tapered cavity, but the metal The ball is preferably plated with the same material as the tapered cavity electrode. 17. The safety switch when the lamp is toppled according to claim 1 or 6, characterized in that the metal ball in the safety switch when toppled is made of a material different from that used, and is preferably chrome-plated. 18. An electronic circuit unit corresponding to the safety switch when the lamp falls over according to claim 1, comprising a pressure reducing unit, a rectifying unit and a voltage stabilizing unit, characterized in that the electronic circuit unit further comprises: a transistor; A fall-time safety unit, the fall-time safety switch is respectively connected between the voltage stabilizing unit and the base of the transistor through resistors; and A relay that acts as an electronic switch according to the on/off signal of the switch, the coil of the relay is connected in series with the collector of the transistor, and the normally closed contact of the relay is directly connected in parallel with the lighting fixture after being connected in series Both ends of the AC power supply. 19. The electronic circuit unit according to claim 18, characterized in that said electronic circuit unit further comprises: A delay circuit unit composed of a capacitor, a resistor connected in series with the base of the transistor and the emitter of the transistor. 20. An electronic circuit unit as claimed in claim 18 or 19, characterized in that the electronic circuit unit may be part of an electronic dimmer circuit unit. 21. An electronic circuit unit according to claim 18 or 19, characterized in that the electronic circuit unit may be a separate part of the electronic dimmer circuit unit. 22. An electronic circuit unit corresponding to the safety switch when the lamp is toppled according to claim 6, comprising a high-power silicon controlled rectifier functioning as an electronic switch, characterized in that the safety switch when toppled is connected in series with a low-power adjustable The silicon controlled silicon is connected across between the power supply and the base of the high power silicon controlled silicon.

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