Normally closed safety switch

Abstract

The utility model relates to a normally-closed safety switch, which comprises a base and a shell arranged on the base, a fixed contact assembly is arranged in the shell, a button assembly is arranged at the upper end of the shell, a movable contact assembly is arranged at one end of the button assembly, the fixed contact assembly comprises two terminals and two static contact pieces, and the static contact pieces are arranged on the base. The two static contact pieces are oppositely arranged in the shell, the movable contact assembly comprises a support and a movable contact, the support is arranged between the two static contact pieces, the movable contact is arranged on the support, each static contact piece comprises a connecting part and a contact part, the connecting part is arranged between the terminal and the contact part, the contact part is arranged above the support, and the movable contact is arranged on the support. The movable contact is driven by the button assembly to move towards the base so that the movable contact can be disconnected from the contact part or move back to the base so that the movable contact can be connected with the contact part. The technical scheme provided by the utility model has the technical effects of simple and reasonable structure and capability of meeting special use requirements of users.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a normally closed safety switch. Background Art

[0002] A switch is one of the most common general electrical components, and its function is to control the on and off of electrical equipment. At present, the safety switch in the prior art is generally provided with a movable contact and a fixed contact, which are turned on when the two contacts are in contact and turned off when the two contacts are separated. Most switches used on the market are generally normally open push button switches, which make the two contacts contact and turn on by pressing the button. However, in order to meet the special needs of users, it is urgent to design a normally closed safety switch. Utility Model Content

[0003] Based on the above problems, the utility model provides a normally closed safety switch with a simple and reasonable structure to meet the special use requirements of users.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a normally closed safety switch, comprising a base and a shell arranged on the base, a fixed contact assembly being arranged in the shell, a button assembly being arranged on the upper end of the shell and slidably cooperating with the shell, a movable contact assembly being arranged on one end of the button assembly placed in the shell, the fixed contact assembly comprising two terminals located at the bottom of the base and two static contacts respectively connected to the terminals, the two static contacts being arranged oppositely in the shell, the movable contact assembly comprising a bracket and a moving contact, the bracket being arranged between the two static contacts and movably connected to the button assembly, the moving contact being arranged on the bracket, the static contact comprising a connecting portion and a contact portion, the connecting portion being arranged between the terminal and the contact portion, the contact portion being arranged above the bracket and corresponding to the position of the moving contact, the moving contact being driven by the button assembly to move toward the base to disconnect it from the contact portion or to move away from the base to connect it with the contact portion.

[0005] By adopting the above technical solution, when the operator operates the button assembly, the button assembly drives the bracket to move downward, and the moving contact arranged on the bracket moves downward synchronously with the bracket, and the contact part of the static contact piece is separated from the corresponding moving contacts, so that the circuit is disconnected. The structure is simple and reasonable, and meets the special usage needs of the user. The two static contact pieces are relatively arranged in the shell, and the bracket is arranged between the two static contact pieces. The structure is more compact, and the contact part is separated from the moving contact to disconnect the circuit or fit together to conduct the circuit. The structure is more solid, avoiding the occurrence of poor contact with the moving contact due to contact falling off, and further improving the reliability of the structure.

[0006] The utility model is further configured as follows: the button assembly includes an operating piece and a push rod, the push rod is arranged at one end of the operating piece corresponding to the direction of the bracket and is placed in the shell, the upper end of the bracket is connected to the lower end of the push rod, the push rod outer sleeve is provided with a first spring, one end of the first spring abuts against the operating piece, and the other end abuts against the bracket, a second spring is provided at the lower end of the bracket, and the base is provided with a accommodating groove for accommodating the second spring corresponding to the position of the second spring, one end of the second spring abuts against the lower end of the bracket, and the other end abuts against the bottom wall of the accommodating groove.

[0007] By adopting the above technical solution, the operator presses the operating member to press the push rod downward, so that the first spring is pressed downward and drives the bracket to move downward. The bracket is supported by the second spring, so that when the bracket moves downward, the second spring is compressed, the moving contact on the bracket is separated from the contact part, and the circuit is disconnected. When resetting, the operator releases the operating member, and under the elastic resetting action of the first spring and the second spring, the bracket moves up and resets, the moving contact fits with the contact part, and the circuit is connected. The setting of the accommodating groove facilitates the installation of the second spring and plays a role in guiding the extension and contraction of the second spring to avoid the extension and deformation of the second spring and improve the service life. The first spring is sleeved on the outside of the push rod, and plays a role in positioning and installing the first spring while supporting the operating member, so that the structure between the bracket and the operating member is more stable and compact. Through the extension and contraction of the first spring and the second spring, the movement and reset of the bracket are more sensitive and smooth, and the first spring and the second spring are abutted on the upper and lower end surfaces of the bracket, making the disassembly and assembly of the structure more convenient.

[0008] The utility model is further configured that: a limiting groove matched with the second spring is arranged at the lower end of the bracket corresponding to the position of the second spring.

[0009] By adopting the above technical solution, when the bracket is abutted against the upper end surface of the second spring, the setting of the limiting groove is used to locate the position of the bracket on the second spring, so that the installation position is more accurate and the installation of the bracket is convenient.

[0010] The utility model is further configured that guide blocks are respectively arranged at both ends of the bracket in the width direction, the two guide blocks and the two moving contacts are arranged in a cross shape, and the housing is provided with guide grooves adapted to the guide blocks at positions corresponding to the guide blocks.

[0011] By adopting the above technical scheme, a guiding movement function is achieved. When the operator presses the operating piece to move the bracket and drive the moving contact to separate from the contact part, the bracket is adjusted up and down along the guide groove through the guide block, so that the moving contact is disconnected or connected with the contact part, and the stability of the up and down movement of the bracket is further improved, making the moving position more accurate. The two guide blocks and the two moving contacts are arranged in a cross shape, the space is reasonably arranged, and the structure is more reasonable.

[0012] The utility model is further configured as follows: the operating member includes a pressing portion and a limiting portion, the upper end of the shell is provided with a sliding hole adapted to the pressing portion, one end of the pressing portion penetrates into the shell toward the sliding hole and is connected to the limiting portion, and the outer diameter of the limiting portion is greater than the inner diameter of the sliding hole.

[0013] By adopting the above technical solution, a limiting effect is achieved, thereby preventing the operating member from being separated from the housing position when resetting due to the elasticity of the first spring, and the structure is more stable.

[0014] The utility model is further configured as follows: a cavity is provided in the shell, the cavity includes an upper area and a lower area, the inner diameter of the upper area is smaller than the inner diameter of the lower area, the fixed contact assembly is arranged in the lower area, the upper end surface of the contact part abuts against the top surface of the lower area, a through groove is provided at the bottom of the base, the terminal is inserted in the through groove, and an anti-detachment block is provided on the terminal for preventing the terminal from escaping from the through groove, and the lower end surface of the anti-detachment block abuts against the upper end surface of the base.

[0015] By adopting the above technical solution, when installing the fixed contact assembly, first insert the terminal into the base along the through slot position, and the anti-dropping block not only positions the installed terminal, but also prevents the terminal from detaching from the through slot position, and the structure is stable. When the shell and the base are installed, the upper end surface of the contact part abuts against the lower end surface of the upper area, further improving the stability of the structure, making the structure of the fixed contact assembly in the shell more stable and not easy to shift.

[0016] The utility model is further configured as follows: installation grooves are respectively provided on both sides of the bottom of the shell, positioning blocks adapted to the installation grooves are provided at positions of the base corresponding to the installation grooves, two clamping blocks are provided at the outer periphery of the base, the two clamping blocks and the two positioning blocks are arranged in a cross shape, and clamping grooves adapted to be clamped therewith are respectively provided at positions of the shell corresponding to the clamping blocks.

[0017] By adopting the above technical solution, the installation groove and the positioning block play the role of positioning the installation base. The setting of the clamping block and the clamping groove fixes the shell and the base, making the connection structure between the two more stable. When installing the base and the shell, the positioning block of the base is first aligned with the position of the installation groove of the shell, and the two move relative to each other. When the positioning block abuts against the installation groove, the clamping groove and the clamping block are clamped to complete the installation of the base and the shell, which is easy to operate. The two clamping blocks and the two positioning blocks are arranged in a cross shape, which reasonably arranges the space and has a more reasonable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the embodiment of the utility model is shown in FIG. Figure 1 ;

[0019] Figure 2 The structure of the embodiment of the utility model is shown in FIG. Figure 2 ;

[0020] Figure 3 for Figure 2 A magnified view of the structure of part A;

[0021] Figure 4 It is a structural explosion view of an embodiment of the utility model;

[0022] Meaning of the numbers in the figure: 1-base, 2-shell, 3-fixed contact assembly, 301-terminal, 302-static contact piece, 3021-connecting part, 3022-contact part, 4-button assembly, 401-operating member, 4011-pressing part, 4012-limiting part, 402-push rod, 5-movable contact assembly, 501-bracket, 502-moving contact, 6-first spring, 7-second spring, 8-accommodating groove, 9-limiting groove, 10-guide block, 11-guide groove, 12-sliding hole, 13-cavity, 1301-upper area, 1302-lower area, 14-through groove, 15-anti-dropping block, 16-installation groove, 17-positioning block, 18-card block, 19-card groove. DETAILED DESCRIPTION

[0023] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0024] See attached Figure 1-4The utility model discloses a normally closed safety switch, a normally closed safety switch, comprising a base 1 and a shell 2 arranged on the base 1, a fixed contact assembly 3 is arranged in the shell 2, a button assembly 4 slidingly matched with the shell 2 is arranged at the upper end of the shell 2, and a movable contact 502 assembly 5 is arranged at one end of the button assembly 4 placed in the shell 2, the fixed contact assembly 3 comprises two terminals 301 located at the bottom of the base 1 and two stationary contact pieces 302 respectively connected to the terminals 301, the two stationary contact pieces 302 are arranged in the shell 2 in a relative manner, and the movable contact 502 assembly 5 comprises a bracket 501 , moving contact 502, the bracket 501 is arranged between the two static contact pieces 302 and is connected to the button assembly 4, the moving contact 502 is arranged on the bracket 501, the static contact piece 302 includes a connecting part 3021 and a contact part 3022, the connecting part 3021 is arranged between the terminal 301 and the contact part 3022, the contact part 3022 is arranged above the bracket 501 and corresponds to the position of the moving contact 502, the moving contact 502 is driven by the button assembly 4 to move toward the base 1 to disconnect it from the contact part 3022 or move away from the base 1 to connect it with the contact part 3022. When the operator operates the button assembly 4, the button assembly 4 drives the bracket 501 to move downward. At the same time, the moving contact 502 arranged on the bracket 501 moves downward synchronously with the bracket 501, and the contact part 3022 of the static contact piece 302 is separated from each corresponding moving contact 502, so that the circuit is disconnected. The structure is simple and reasonable, and meets the special usage requirements of the user. The two static contact pieces 302 are relatively arranged in the shell 2, and the bracket 501 is arranged between the two static contact pieces 302. The structure is more compact. The contact part 3022 is separated from the moving contact 502 to disconnect the circuit or fit together to make the circuit conductive. The structure is more solid, avoiding the occurrence of poor contact with the moving contact 502 due to contact falling off, and further improving the reliability of the structure.

[0025] This embodiment is further configured as follows: the button assembly 4 includes an operating member 401 and a push rod 402, the push rod 402 is arranged at one end of the operating member 401 corresponding to the direction of the bracket 501 and is placed in the shell 2, the upper end of the bracket 501 is connected to the lower end of the push rod 402, the push rod 402 is provided with a first spring 6 on the outer sleeve, one end of the first spring 6 abuts against the operating member 401, and the other end abuts against the bracket 501, the lower end of the bracket 501 is provided with a second spring 7, the base 1 corresponds to the position of the second spring 7 and is provided with a receiving groove 8 for accommodating the second spring 7, one end of the second spring 7 abuts against the lower end of the bracket 501, and the other end abuts against the bottom wall of the receiving groove 8. The operator presses the operating member 401 to press the push rod 402 downward, so that the first spring 6 is pressed downward and drives the bracket 501 to move downward. The bracket 501 is supported by the second spring 7, so that when the bracket 501 moves downward, the second spring 7 is compressed, the moving contact 502 on the bracket 501 is separated from the contact part 3022, and the circuit is disconnected. When resetting, the operator releases the operating member 401. Under the elastic resetting action of the first spring 6 and the second spring 7, the bracket 501 moves upward and resets, the moving contact 502 fits with the contact part 3022, and the circuit is turned on. The arrangement of the accommodating groove 8 is convenient for the first When the second spring 7 is installed, it plays a role in guiding the extension and retraction of the second spring 7, avoiding the extension and deformation of the second spring 7 and prolonging its service life. The first spring 6 is sleeved on the outside of the push rod 402, and plays a role in positioning and installing the first spring 6 while supporting the operating member 401, so that the structure between the bracket 501 and the operating member 401 is more stable and compact. Through the extension and retraction of the first spring 6 and the second spring 7, the movement and reset of the bracket 501 are more sensitive and smooth, and the first spring 6 and the second spring 7 are abutted against the upper and lower end surfaces of the bracket 501, so that the disassembly and assembly of the structure is more convenient.

[0026] This embodiment is further configured as follows: a limiting groove 9 adapted to the second spring 7 is provided at the lower end of the bracket 501 and corresponds to the position of the second spring 7. When the bracket 501 is abutted against the upper end surface of the second spring 7, the setting of the limiting groove 9 is used to locate the position of the bracket 501 on the second spring 7, so that the installation position is more accurate and the installation of the bracket 501 is convenient.

[0027] This embodiment further provides that: guide blocks 10 are respectively provided at both ends of the width direction of the bracket 501, and the two guide blocks 10 and the two moving contacts 502 are arranged in a cross shape, and the housing 2 is provided with guide grooves 11 adapted to the guide blocks 10 at positions corresponding to the guide blocks 10. It plays a role in guiding movement. When the operator presses the operating member 401 to move the bracket 501 and drive the moving contact 502 to separate from the contact part 3022, the bracket 501 moves up and down along the guide groove 11 through the guide block 10 to adjust, so that the moving contact 502 and the contact part 3022 are disconnected or connected, further improving the stability of the up and down movement of the bracket 501, making the moving position more accurate, and the two guide blocks 10 and the two moving contacts 502 are arranged in a cross shape, so that the space is reasonably arranged and the structure is more reasonable.

[0028] This embodiment further provides that: the operating member 401 includes a pressing portion 4011 and a limiting portion 4012, the upper end of the housing 2 is provided with a sliding hole 12 adapted to the pressing portion 4011, one end of the pressing portion 4011 penetrates into the housing 2 in the direction of the sliding hole 12 and is connected to the limiting portion 4012, and the outer diameter of the limiting portion 4012 is greater than the inner diameter of the sliding hole 12. This plays a limiting role, preventing the operating member 401 from being separated from the housing 2 position due to the elasticity of the first spring 6 when resetting, and the structure is more stable.

[0029] This embodiment is further configured as follows: a cavity 13 is provided in the shell 2, and the cavity 13 includes an upper area 1301 and a lower area 1302, the inner diameter of the upper area 1301 is smaller than the inner diameter of the lower area 1302, the fixed contact assembly 3 is arranged in the lower area 1302, the upper end surface of the contact part 3022 abuts against the top surface of the lower area 1302, a through groove 14 is provided at the bottom of the base 1, the terminal 301 is inserted in the through groove 14, and an anti-dropping block 15 is provided on the terminal 301 for preventing the terminal 301 from escaping from the through groove 14, and the lower end surface of the anti-dropping block 15 abuts against the upper end surface of the base 1. When installing the fixed contact assembly 3, first insert the terminal 301 into the base 1 along the through slot 14. The anti-drop block 15 not only positions the installed terminal 301, but also prevents the terminal 301 from escaping from the through slot 14. The structure is stable. When the shell 2 and the base 1 are installed, the upper end surface of the contact portion 3022 abuts against the lower end surface of the upper area 1301, further improving the stability of the structure, making the structure of the fixed contact assembly in the shell 2 more stable and not easy to shift.

[0030] This embodiment is further provided with: mounting grooves 16 are respectively provided on both sides of the bottom of the shell 2, and a positioning block 17 adapted to the mounting groove 16 is provided at the position of the base 1 corresponding to the mounting groove 16, and two clamping blocks 18 are provided on the outer periphery of the base 1, and the two clamping blocks 18 and the two positioning blocks 17 are arranged in a cross shape, and the housing 2 is respectively provided with clamping grooves 19 adapted to be clamped therewith at the positions corresponding to the clamping blocks 18. The mounting grooves 16 and the positioning blocks 17 play the role of positioning and installing the base 1, and the arrangement of the clamping blocks 18 and the clamping grooves 19 fixes the housing 2 and the base 1, so that the connection structure between the two is more stable. When the base 1 and the housing 2 are installed, the positioning block 17 of the base 1 is first aligned with the mounting groove 16 of the housing 2, and the two move relative to each other. When the positioning block 17 abuts against the mounting groove 16, the clamping groove 19 is clamped with the clamping block 18, and the installation of the base 1 and the housing 2 is completed, which is convenient to operate. The two clamping blocks 18 and the two positioning blocks 17 are arranged in a cross shape, and the space is reasonably arranged, and the structure is more reasonable.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. A normally closed safety switch, comprising a base and a shell arranged on the base, wherein a fixed contact assembly is arranged in the shell, a button assembly slidingly matched with the shell is arranged at the upper end of the shell, and a movable contact assembly is arranged at one end of the button assembly placed in the shell, characterized in that: The fixed contact assembly includes two terminals located at the bottom of the base and two static contacts respectively connected to the terminals, the two static contacts are arranged opposite to each other in the shell, the movable contact assembly includes a bracket and a moving contact, the bracket is arranged between the two static contacts and is movably connected to the button assembly, the moving contact is arranged on the bracket, the static contact includes a connecting part and a contact part, the connecting part is arranged between the terminal and the contact part, the contact part is arranged above the bracket and corresponds to the position of the moving contact, and the moving contact can be driven by the button assembly to move toward the base to disconnect it from the contact part or move away from the base to connect it with the contact part.

2. A normally closed safety switch according to claim 1, characterized in that: The button assembly includes an operating member and a push rod. The push rod is arranged at one end of the operating member corresponding to the direction of the bracket and is placed in the shell. The upper end of the bracket is connected to the lower end of the push rod. The push rod outer sleeve is provided with a first spring. One end of the first spring abuts against the operating member, and the other end abuts against the bracket. A second spring is provided at the lower end of the bracket. The base corresponds to the position of the second spring and is provided with a accommodating groove for accommodating the second spring. One end of the second spring abuts against the lower end of the bracket, and the other end abuts against the bottom wall of the accommodating groove.

3. A normally closed safety switch according to claim 2, characterized in that: A limiting groove matched with the second spring is arranged at the lower end of the bracket corresponding to the position of the second spring.

4. A normally closed safety switch according to claim 1, characterized in that: Guide blocks are respectively arranged at both ends of the bracket in the width direction, and the two guide blocks and the two moving contacts are arranged in a cross shape. The housing is provided with guide grooves adapted to the guide blocks at positions corresponding to the guide blocks.

5. A normally closed safety switch according to claim 2, characterized in that: The operating member includes a pressing portion and a limiting portion. A sliding hole adapted to the pressing portion is opened at the upper end of the shell. One end of the pressing portion penetrates into the shell toward the sliding hole and is connected to the limiting portion. The outer diameter of the limiting portion is larger than the inner diameter of the sliding hole.

6. A normally closed safety switch according to claim 1, characterized in that: A cavity is provided in the shell, and the cavity includes an upper area and a lower area. The inner diameter of the upper area is smaller than the inner diameter of the lower area. The fixed contact assembly is arranged in the lower area. The upper end surface of the contact part abuts against the top surface of the lower area. A through groove is provided at the bottom of the base. The terminal is inserted in the through groove. An anti-detachment block is provided on the terminal to prevent the terminal from escaping from the through groove. The lower end surface of the anti-detachment block abuts against the upper end surface of the base.

7. A normally closed safety switch according to claim 1, characterized in that: Installation grooves are respectively arranged on both sides of the bottom of the shell, and positioning blocks adapted to the installation grooves are arranged at positions corresponding to the installation grooves on the base, and two clamping blocks are arranged on the outer periphery of the base, and the two clamping blocks and the two positioning blocks are arranged in a cross shape, and clamping grooves adapted to the clamping blocks are respectively arranged at positions corresponding to the clamping blocks on the shell.

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