Safety switch with anti-fooling function and toaster

Abstract

The present invention discloses a safety switch and a toaster with a fool-proof function. The safety switch comprises two pairs of live wire mechanical switch contacts, a pair of neutral wire mechanical switch contacts, and a trigger bracket. The two pairs of live wire mechanical switches are connected in series in a power supply circuit. A trigger gap is formed between the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts. A pushing block is provided on the trigger bracket, and the trigger bracket can move up and down to drive the pushing block to enter and exit the trigger gap. When the pushing block enters the trigger gap, the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts are respectively electrically contacted. The toaster disclosed in the present invention is equipped with a safety switch. The safety switch can effectively prevent the occurrence of a situation where the power supply cannot be turned off due to loss of control of the safety switch, thereby improving the safety performance of the toaster. In addition, the safety switch adopts a mechanical contact structure, is not affected by high temperature and other electromagnetic interference signals, and has high safety.

Description

Technical Field

[0001] The present invention relates to the technical field of safety switches, and in particular to a safety switch with a fool-proof function and a toaster. Background Art

[0002] A toaster, also known as an automatic bread toaster or bread toaster, is an electric cooker specifically designed for re-toasting sliced bread. Since bread is cooked, the electric heater in a toaster typically operates for only a few minutes at a time. For safety reasons, toasters are typically equipped with a timer. When the heating time is reached, the controller automatically shuts off the power circuit to the power switch to prevent the heater from burning dry for an extended period. In practice, it has been found that the power switch of a toaster can become stuck and fail, posing a safety hazard. Therefore, to ensure the safety of toasters, new safety regulations require the addition of an additional power switch to the toaster's power circuit. This ensures that the electric heater only operates when both power switches are simultaneously on, thus preventing the heater from being unable to shut off if one power switch fails. However, in existing technology, these two power switches are electronically controlled, which can easily fail to shut off the power when temperatures are high. Therefore, improvements to the safety switch structure of toasters are necessary. Summary of the Invention

[0003] The purpose of the present invention is to solve the above technical problems and provide a safety switch and a toaster with a foolproof function that can effectively prevent the safety switch from losing control and being unable to turn off the power supply.

[0004] In order to achieve the above-mentioned objectives, the present invention discloses a safety switch with a fool-proof function, which includes two pairs of live wire mechanical switch contacts, a pair of neutral wire mechanical switch contacts and a trigger bracket; the two pairs of live wire mechanical switch contacts are arranged in parallel and spaced apart, and are connected in series in a power supply circuit; the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts are arranged back to back, and a trigger gap is formed between the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts; a pushing block is provided on the trigger bracket, and the trigger bracket can move up and down to drive the pushing block in and out of the trigger gap. When the pushing block enters the trigger gap, the pushing block simultaneously applies pushing force to the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts, so that the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts are electrically contacted respectively.

[0005] Preferably, it includes a circuit substrate, on which a live wire metal shrapnel group and a neutral wire metal shrapnel group are arranged in opposite directions, two pairs of live wire mechanical switch contacts are arranged on the live wire metal shrapnel group, and a pair of neutral wire mechanical switch contacts are arranged on the neutral wire metal shrapnel group;

[0006] The live wire metal spring group includes two pairs of first movable plates and first static plates respectively arranged opposite to each other, and the neutral wire metal spring group includes a pair of second movable plates and second static plates respectively arranged opposite to each other, wherein the first movable plate is adjacent to the second movable plate, and the trigger gap is formed between the first movable plate and the second movable plate. When the pushing block enters the trigger gap, the pushing block pushes the first movable plate and the second movable plate close to the first static plate and the second static plate respectively.

[0007] Preferably, two of the first movable plates and one of the second movable plates are provided with arc-shaped bending portions that bend into the trigger gap.

[0008] Preferably, the two first moving pieces are connected to the base plate via the same first connecting substrate, and the two first static pieces are connected to the base plate via different second connecting substrates and third connecting substrates, respectively.

[0009] Preferably, a control mechanism is further provided on the circuit substrate, and the control mechanism is used to control the length of time that the pushing block is located in the trigger gap.

[0010] Preferably, the control mechanism includes a first hook and a lock, the lock is connected to the first hook, and the trigger bracket is provided with a second hook that can be hooked together with the first hook. The first hook can flip over to disengage the first hook from the second hook, and the lock is used to lock or unlock the current state of the first hook.

[0011] Preferably, the locker includes an electromagnet, and a magnet sheet is provided on the first hook, and the electromagnet can generate an interactive attractive force with the magnet sheet.

[0012] Preferably, the outer side surfaces of the first hook and the second hook are both arc-shaped.

[0013] The present invention also discloses a toaster, which includes a toaster body, on which an electric heater and the safety switch with foolproof function as described above are arranged, and two pairs of live wire mechanical switch contacts are connected in series in the power circuit where the electric heater is located.

[0014] Compared with the prior art, the toaster disclosed in the present invention is equipped with a safety switch with an anti-foolproof function, including two pairs of live wire mechanical switch contacts, a pair of neutral wire mechanical switch contacts and a trigger bracket. When the pushing block enters the trigger gap, the pushing block pushes the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts at the same time, so that the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts are connected, thereby connecting the power circuit of the electric heater. When the trigger bracket drives the pushing block to exit the trigger gap, the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts are reset, disconnecting the power circuit of the electric heater. At this time, if one pair of live wire mechanical switch contacts is stuck, the power circuit of the electric heater can still be disconnected under the action of the other live wire mechanical switch contact. It can be seen that through the above-mentioned safety switch, the situation where the power cannot be turned off due to the safety switch losing control can be effectively prevented, thereby improving the safety performance of the toaster. In addition, the above-mentioned safety switch adopts a mechanical contact structure, is not affected by high temperature and other electromagnetic interference signals, and has high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the three-dimensional structure of the safety switch on the toaster in the embodiment of the present invention in the off state.

[0016] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the live wire metal shrapnel group and the neutral wire metal shrapnel group.

[0017] Figure 3 Schematic diagram of the three-dimensional structure of the trigger bracket in the untriggered state according to the embodiment of the present invention.

[0018] Figure 4 It is a plan view of the trigger bracket in the trigger state according to the embodiment of the present invention.

[0019] Figure 5 Schematic diagram of the working state of the control mechanism in an embodiment of the present invention.

[0020] Figure 6 for Figure 5 Schematic diagram of the three-dimensional structure of the control mechanism. DETAILED DESCRIPTION

[0021] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0022] This embodiment discloses a toaster for baking bread and other foods, which includes a toaster body, an electric heater and a safety switch with a foolproof function provided on the toaster body, which prevents the switch circuit of the toaster from becoming stagnant. Specifically, Figures 1 to 4The safety switch includes two pairs of live wire mechanical switch contacts D0, a pair of neutral wire mechanical switch contacts D1, and a trigger bracket 1. The two pairs of live wire mechanical switch contacts D0 are arranged in parallel and spaced apart, and are connected in series in the power supply circuit where the electric heater is located. The two pairs of live wire mechanical switch contacts D0 and the pair of neutral wire mechanical switch contacts D1 are arranged in back-to-back relationship, forming a trigger gap L between the two pairs of live wire mechanical switch contacts D0 and the pair of neutral wire mechanical switch contacts D1. A pushing block 10 is provided on the trigger bracket 1. The trigger bracket 1 can move up and down to drive the pushing block 10 in and out of the trigger gap L. When the pushing block 10 enters the trigger gap L, the pushing block 10 simultaneously applies pushing force to the two pairs of live wire mechanical switch contacts D0 and the pair of neutral wire mechanical switch contacts D1, so that the two pairs of live wire mechanical switch contacts D0 and the pair of neutral wire mechanical switch contacts D1 are respectively electrically contacted.

[0023] In the above embodiment, two pairs of live wire mechanical switch contacts D0 connected in series are provided for the power circuit of the electric heater on the toaster, one pair being D0a and the other pair being D0b. When the push block 10 enters the trigger gap L, as shown in FIG. Figure 4 , the pushing block 10 pushes the two pairs of live wire mechanical switch contacts D0 and the one pair of neutral wire mechanical switch contacts D1 at the same time, so that the two pairs of live wire mechanical switch contacts D0 and the one pair of neutral wire mechanical switch contacts D1 are connected, thereby connecting the power supply circuit where the electric heater is located. When the trigger bracket 1 drives the pushing block 10 to exit the trigger gap L, as shown Figure 3 The two pairs of live wire mechanical switch contacts D0 and the pair of neutral wire mechanical switch contacts D1 reset, disconnecting the power circuit to the electric heater. If one of the live wire mechanical switch contacts D0 (e.g., D0a) becomes stuck, the other live wire mechanical switch contact D0 (D0b) can still disconnect the heater's power circuit. This safety switch effectively prevents situations where the power cannot be turned off due to a loss of control of the safety switch, thereby improving the safety performance of the toaster. Furthermore, the safety switch utilizes a mechanical contact structure that is unaffected by high temperatures and other electromagnetic interference signals, providing high safety.

[0024] For further information, please refer to Figures 1 to 4The toaster also includes a circuit substrate 2, on which are disposed oppositely spaced metal domes 30 and a neutral metal dome 31. Two pairs of live wire mechanical switch contacts D0 are disposed on the live wire dome 30, and a pair of neutral wire mechanical switch contacts D1 are disposed on the neutral wire dome 31. Specifically, the live wire dome 30 includes two pairs of opposed first movable plates 300 and first stationary plates 301, with the two pairs of live wire mechanical switch contacts D0 disposed on the two pairs of first movable plates 300 and first stationary plates 301, respectively. The neutral wire dome 31 includes a pair of opposed second movable plates 310 and second stationary plates 311, with the pair of neutral wire mechanical switch contacts D1 disposed on the second movable plates 310 and second stationary plates 311, respectively. The first movable plate 300 and the second movable plate 310 are adjacent to each other, forming a trigger gap L between the first movable plate 300 and the second movable plate 310. When the pushing block 10 enters the trigger gap L, the pushing block 10 pushes the first movable plate 300 and the second movable plate 310, respectively, toward the first static plate 301 and the second static plate 311. When the two pairs of first movable plates 300 and first static plates 301 are brought into proximity, the two pairs of live wire mechanical switch contacts D0 come into contact, thereby connecting the live line of the power circuit where the electric heater resides. When the pair of second movable plates 310 and second static plates 311 are brought into proximity, the pair of neutral wire mechanical switch contacts D1 come into contact, thereby connecting the neutral line of the power circuit where the electric heater resides, thereby energizing the power circuit of the electric heater.

[0025] Preferably, to ensure the resetting effect of the first movable piece 300 and the second movable piece 310, an arc-shaped bend portion 32 that bends into the trigger gap L is provided on the two first movable pieces 300 and the second movable piece 310. When the pushing block 10 enters the trigger gap L, the pushing block 10 causes the curvature of the arc-shaped bend portion 32 on the first movable piece 300 and the second movable piece 310 to change (become smaller), thereby causing the arc-shaped bend portion 32 to generate an elastic restoring force pointing in the direction of the trigger gap L. In this way, when the pushing block 10 exits the trigger gap L, the first movable piece 300 and the second movable piece 310 automatically move away from the first static piece 301 and the second static piece 311 respectively under the action of the elastic restoring force of the mutually bent portions 32, thereby ensuring the automatic disconnection of the power circuit.

[0026] Further, such as Figure 2 To prevent simultaneous jamming of the two pairs of first movable pieces 300 and first static pieces 301, the two first movable pieces 300 are connected to the base plate via the same first connecting substrate 40, while the two first static pieces 301 are connected to the base plate via different second connecting substrates 41 and third connecting substrates 42. In this embodiment, the two first static pieces 301 are connected to two different substrates (the second connecting substrate 41 and the third connecting substrate 42), thereby preventing simultaneous jamming of the two pairs of first movable pieces 300 and first static pieces 301 due to the same cause.

[0027] In another preferred embodiment of the toaster of the present invention, Figure 1 、 Figure 5 and Figure 6 The circuit board 2 is also provided with a control mechanism 5, which is used to control the length of time the push block 10 remains within the trigger gap L, thereby improving the automatic control effect of the toaster and enhancing the user experience. Specifically, the control mechanism 5 includes a first hook 51 and a lock 50. The lock 50 is connected to the first hook 51. The trigger bracket 1 is provided with a second hook 11 that can be hooked with the first hook 51. The first hook 51 can flip to disengage the first hook 51 from the second hook 11. The lock 50 is used to lock or unlock the current state of the first hook 51. When the trigger bracket 1 moves downward, causing the push block 10 to enter the trigger gap L, the first hook 51 and the second hook 11 to hook together. At this time, the lock 50 locks the first hook 51 in this state, thereby locking the trigger bracket 1 in this position. When the heating time expires, the lock 50 unlocks the first hook 51, causing the first hook 51 to disengage from the second hook 11, thereby allowing the trigger bracket 1 to move the push block 10 upward, disconnecting the power circuit of the electric heater. More specifically, the lock 50 includes an electromagnet, and a magnet 52 is mounted on a first hook 51. The electromagnet and magnet 52 generate an attractive force. The lock 50 operates as follows: when the trigger bracket 1 moves downward, causing the first hook 51 to hook with the second hook 11, the electromagnet is energized, exerting an attractive force on the magnet 52, thereby locking the first hook 51 in this position and allowing the toaster to heat. When the heating time expires, the electromagnet loses power, and the attractive force on the magnet 52 disappears, automatically unlocking the first hook 51. At this point, since the first hook 51 is free to flip, the tension provided by the trigger bracket 1 causes the first hook 51 and the magnet 52 to flip together, disengaging the first hook 51 from the second hook 11. This causes the trigger bracket 1 to move upward, and the toaster automatically stops heating.

[0028] Preferably, outer side surfaces of the first hook 51 and the second hook 11 are both arc-shaped, thereby facilitating smooth hooking connection between the first hook 51 and the second hook 11 .

[0029] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope of the present invention.

Claims

1. A safety switch with foolproof function, characterized in that: The invention comprises two pairs of live wire mechanical switch contacts, a pair of neutral wire mechanical switch contacts and a trigger bracket; the two pairs of live wire mechanical switch contacts are arranged in parallel and spaced apart and are connected in series in the power supply circuit; the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts are arranged in back-to-back relation, forming a trigger gap between the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts; a pushing block is provided on the trigger bracket, and the trigger bracket can move up and down to drive the pushing block to enter and exit the trigger gap, when the pushing block enters the trigger gap, the pushing block simultaneously applies pushing force to the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts, so that the two pairs of live wire mechanical switch contacts and the pair of neutral wire mechanical switch contacts are respectively electrically contacted; the invention comprises a circuit substrate, on which a live wire metal spring group and a neutral wire metal spring group distributed in back-to-back relation are provided, the two pairs of live wire mechanical switch contacts are arranged on the live wire metal spring group, and the pair of neutral wire mechanical switch contacts are arranged on the neutral wire metal spring group; The live wire metal spring group includes two pairs of first movable plates and first static plates respectively arranged opposite to each other, and the neutral wire metal spring group includes a pair of second movable plates and second static plates respectively arranged opposite to each other, wherein the first movable plate is adjacent to the second movable plate, and the trigger gap is formed between the first movable plate and the second movable plate. When the pushing block enters the trigger gap, the pushing block pushes the first movable plate and the second movable plate close to the first static plate and the second static plate respectively; the two first movable plates and the one second movable plate are provided with an arc-shaped bending portion that bends into the trigger gap; the two first movable plates are connected to the substrate through the same first connecting substrate, and the two first static plates are connected to the substrate through different second connecting substrates and third connecting substrates respectively.

2. The safety switch with foolproof function according to claim 1, characterized in that: A control mechanism is also provided on the circuit substrate, and the control mechanism is used to control the length of time the pushing block is located in the trigger gap.

3. The safety switch with foolproof function according to claim 2, characterized in that: The control mechanism includes a first hook and a lock, the lock is connected to the first hook, and the trigger bracket is provided with a second hook that can be hooked together with the first hook. The first hook can flip to disengage the first hook from the second hook, and the lock is used to lock or unlock the current state of the first hook.

4. The safety switch with foolproof function according to claim 3, characterized in that: The locker includes an electromagnet. A magnet sheet is provided on the first hook. The electromagnet can generate an interactive attraction with the magnet sheet.

5. The safety switch with foolproof function according to claim 3, characterized in that: The outer side surfaces of the first hook and the second hook are both arc-shaped.

6. A toaster, characterized in that: The invention comprises a furnace body, on which an electric heater and a safety switch with foolproof function as claimed in any one of claims 1 to 5 are arranged, and two pairs of live wire mechanical switch contacts are connected in series in the power circuit where the electric heater is located.

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