Safety device for travel switch

Abstract

The invention aims to provide a safety device for a travel switch, which comprises a retainer, uniformly distributed threaded holes are formed in the side surface of the retainer, a steel ball assembly is mounted in the threaded holes, the steel ball assembly tightly holds a zipper assembly in the circumferential direction, the steel ball assembly comprises a shell, a retaining sleeve, a push rod, a spring and a steel ball, the spring is mounted in an inner cavity at the left end of the shell, and a straight slot is formed in the right end of the shell; the zipper assembly comprises a safety pull cover, a zipper, a U-shaped buckle, a sealing ring and a clamping pin, a through hole is formed in the upper end of the zipper, the U-shaped buckle penetrates into the through hole and is embedded into the safety pull cover with a through hole formed in the side face, and the safety pull cover is connected with the zipper through the sealing ring. The bayonet lock penetrates and is kept in the middle after the upper end of the U-shaped buckle is embedded into the safety pull cover, the sealing ring is placed in the middle of a circular groove in the lower end of the safety pull cover and is concentric with the circular groove, and according to the safety device for the travel switch, the conversion force of the travel switch is increased, misoperation can be prevented, and therefore the use requirement is met.

Description

Technical Field

[0001] The invention relates to a switch device, and more particularly to a safety device for a travel switch. Background Art

[0002] The travel switch is one of the most important basic electromechanical components in aerospace system engineering. It is an electromechanical component that realizes the specific function of converting mechanical signals into electrical signals in various harsh environments and specific spaces. It is widely used in my country's aerospace and military fields. The basic working principle of the travel switch is: under the action of external load force, the action mechanism and multiple contact pieces (contacts) are driven to move to the specified stroke to realize the circuit on and off and conversion. Usually, the travel switch is limited by the mechanical properties of the spring and can withstand a small action force. By setting this safety device, the action force can be increased, the impact resistance and vibration resistance of the switch are improved, and misoperation can be prevented, thereby meeting the use requirements. Summary of the invention

[0003] The object of the present invention is to provide a safety device for a travel switch to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A safety device for a travel switch comprises a retainer, wherein the retainer has evenly distributed threaded holes on its side, a steel ball assembly is installed in the threaded holes, and the steel ball assembly holds a zipper assembly tightly in the circumferential direction.

[0006] Preferably, the steel ball assembly comprises: an outer shell, a retaining sleeve, a push rod, a spring, and a steel ball. The inner cavity at the left end of the outer shell is equipped with the spring, and the right end has a S-shaped groove. The long end of the push rod presses the steel ball, and the short end of the push rod presses the spring. The steel ball is installed in the retaining sleeve, and the retaining sleeve is connected to the outer shell by threads.

[0007] Preferably, the retainer has an inverted trapezoidal groove at the upper end, a circular through hole in the middle, threads on the side, and a threaded mounting hole at the bottom.

[0008] Preferably, the zipper assembly comprises: a safety cover, a zipper, a U-shaped buckle, a sealing ring, and a bayonet. A through hole is provided at the upper end of the zipper, and the U-shaped buckle is inserted therein to allow the zipper to move freely. The upper end of the U-shaped buckle is embedded in the safety cover. A through hole is provided on the side of the safety cover. The bayonet is inserted into and kept centered after the upper end of the U-shaped buckle is embedded in the safety cover. The sealing ring is placed centered in the circular groove at the lower end of the safety cover and is concentric with the circular groove.

[0009] Preferably, the outer shell is connected to the retaining sleeve by threads, and a step is provided at the small end of the retaining sleeve to prevent the steel ball from falling out.

[0010] Preferably, the zipper can extend into a circular through hole in the middle of the retainer, and the steel ball of the steel ball assembly presses against the upper surface of the zipper to form a whole.

[0011] Preferably, the mating surface between the zipper and the steel ball is an angled conical surface, and the two conical surfaces are transitioned with a rounded corner.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The safety device for the travel switch increases the switching force of the travel switch and can prevent misoperation, thereby meeting the use requirements of driving the action mechanism and multiple contact members (contact points) to move to a specified stroke under the action of an external load force to achieve circuit switching and conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of a safety device for a travel switch of the present invention;

[0015] Figure 2 It is a structural schematic diagram of a steel ball assembly in a safety device for a travel switch of the present invention;

[0016] Figure 3 It is a schematic diagram of the structure of a retainer in a safety device for a travel switch of the present invention;

[0017] Figure 4 The invention discloses a structural schematic diagram of a zipper assembly in a safety device for a travel switch.

[0018] In the figure: 1. retainer, 2. steel ball assembly, 3. zipper assembly, 21. housing, 22. spring, 23. push rod, 24. retaining sleeve, 25. steel ball, 31. safety pull cover, 32. latch, 33. U-shaped buckle, 34. sealing ring, 35. zipper. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “left end”, “right end”, “long end”, “short end”, “upper end”, “lower end”, “small end”, “bottom”, “side”, “upper side”, and “inside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] See also Figure 1-Figure 4 , the present invention provides a technical solution:

[0022] A safety device for a travel switch comprises a retainer 1. The retainer 1 has evenly distributed threaded holes on its side. A steel ball assembly 2 is installed in the threaded holes. The steel ball assembly 2 holds a zipper assembly 3 tightly in the circumferential direction.

[0023] In this embodiment, the steel ball assembly 2 includes: an outer shell 21, a retaining sleeve 24, a push rod 23, a spring 22, and a steel ball 25. The inner cavity at the left end of the outer shell 21 is equipped with the spring 22, and the right end has a straight groove. The long end of the push rod 23 presses the steel ball 25, and the short end of the push rod 23 presses the spring 22. The steel ball 25 is installed in the retaining sleeve 24, and the retaining sleeve 24 is connected to the outer shell 21 by threads.

[0024] In addition, the retainer 1 has an inverted trapezoidal groove at the upper end, a circular through hole in the middle, threads on the side, and a threaded mounting hole at the bottom.

[0025] Furthermore, the zipper assembly 3 includes: a safety cover 31, a zipper 35, a U-shaped buckle 33, a sealing ring 34, and a pin 32. The zipper 35 has a through hole at the upper end, and the U-shaped buckle 33 is inserted therein so that the zipper 35 can move freely. The upper end of the U-shaped buckle 33 is embedded in the safety cover 31. A through hole is opened on the side of the safety cover 31. The pin 32 is inserted into and kept centered after the upper end of the U-shaped buckle 33 is embedded in the safety cover 31. The sealing ring 34 is placed in the center of the circular groove at the lower end of the safety cover 31 and is concentric with the circular groove.

[0026] Specifically, the housing 21 is connected to the retaining sleeve 24 via threads, and a step is provided at the small end of the retaining sleeve 24 to prevent the steel ball 25 from falling out.

[0027] It is worth noting that the zipper 35 can be inserted into the circular through hole in the middle of the retainer 1, and the steel ball 25 of the steel ball assembly 2 presses against the upper surface of the zipper 35 to form a whole.

[0028] When the safety device for the travel switch of this embodiment is in use, the staff drives the zipper assembly 3 to move upward through the hole at the upper end of the safety pull cover 31, and the steel ball 25 is squeezed by the movement of the zipper 35, and the steel ball 25 squeezes the push rod 23 and the spring 22, so that the entire zipper assembly 3 is disengaged; after the zipper assembly 3 is disengaged, the steel ball 25 and the push rod 23 are reset under the action of the spring 22; when it is necessary to use it in reverse, the zipper assembly 3 is driven to move downward through the hole at the upper end of the safety pull cover 31, and the steel ball 25 is squeezed by the movement of the zipper 35, and the steel ball 25 squeezes the push rod 23 and the spring 22, so that the entire zipper assembly 3 is inserted; after the zipper assembly 3 is inserted, the steel ball 25 and the push rod 23 are reset under the action of the spring 22; during use, regularly check whether the surface of the zipper 35 is intact and check whether the steel ball 25 can be freely extended and retracted in the steel ball assembly 2.

Claims

1. A safety device for a travel switch, characterized in that: It comprises a retainer (1), the side of the retainer (1) is provided with evenly distributed threaded holes, a steel ball assembly (2) is installed in the threaded holes, and the steel ball assembly (2) holds the zipper assembly (3) tightly in the circumferential direction.

2. The safety device for a travel switch according to claim 1, characterized in that: The steel ball assembly (2) comprises: an outer shell (21), a retaining sleeve (24), a push rod (23), a spring (22), and a steel ball (25). The inner cavity at the left end of the outer shell (21) is provided with the spring (22), and the right end is provided with a slot. The long end of the push rod (23) presses the steel ball (25), and the short end of the push rod (23) presses the spring (22). The steel ball (25) is installed in the retaining sleeve (24), and the retaining sleeve (24) is connected to the outer shell (21) by threads.

3. The safety device for a travel switch according to claim 1, characterized in that: The retainer (1) has an inverted trapezoidal groove at the upper end, a circular through hole in the middle, threads on the side, and a threaded mounting hole at the bottom.

4. The safety device for a travel switch according to claim 1, characterized in that: The zipper assembly (3) comprises: a safety cover (31), a zipper (35), a U-shaped buckle (33), a sealing ring (34), and a bayonet (32). The upper end of the zipper (35) is provided with a through hole, and the U-shaped buckle (33) is inserted into the through hole so that the zipper (35) can move freely. The upper end of the U-shaped buckle (33) is embedded in the safety cover (31). The side of the safety cover (31) is provided with a through hole. After the upper end of the U-shaped buckle (33) is embedded in the safety cover (31), the bayonet (32) is inserted into and kept centered. The sealing ring (34) is placed centered in a circular groove at the lower end of the safety cover (31) and is concentric with the circular groove.

5. The safety device for a travel switch according to claim 1, characterized in that: The housing (21) is connected to the retaining sleeve (24) via threads, and a step is provided at the small end of the retaining sleeve (24) to prevent the steel ball (25) from falling out.

6. The safety device for a travel switch according to claim 1, characterized in that: The zipper (35) can be inserted into a circular through hole in the middle of the retainer (1), and the steel ball (25) of the steel ball assembly (2) is pressed against the upper surface of the zipper (35) to form a whole.

7. The safety device for a travel switch according to claim 4, characterized in that: The mating surfaces of the zipper (35) and the steel ball are angled conical surfaces, and the two conical surfaces are transitioned with rounded corners.

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