Drawing unlocking travel switch

Abstract

A travel switch capable of being unlocked through drawing is composed of a zipper mechanism, a driving mechanism, a switching mechanism, a signal output mechanism and a shell protection mechanism. The zipper mechanism comprises a steel cable, a pull rod, a base, a locking spring, an end cover, a first screw and a steel ball; the driving mechanism comprises a push rod, a sliding sleeve, a driving spring and a buffer pad; the switching mechanism comprises a switch assembly and a screw assembly; the output mechanism comprises an electric connector and a connecting wire; the shell protection mechanism comprises a shell, a cover plate and a second screw. The driving mechanism, the conversion mechanism and the signal output mechanism are installed in a cavity formed by the shell protection mechanism. The zipper mechanism and the shell are positioned through a steel ball, and locking force between the zipper mechanism and the switch shell is provided through a locking spring. A push rod of the driving mechanism extends out of the end face of the shell and is used for receiving a control instruction, the push rod drives the sliding sleeve to achieve linkage, and the sliding sleeve transmits an action instruction to the switching mechanism to achieve the switching function of the switching circuit.

Description

Technical Field

[0001] The invention relates to a pull-to-unlock travel switch, which is suitable for providing a switch control instruction by pulling to perform circuit conversion. Background Art

[0002] A travel switch is an electrical device that uses the movement of a mechanical moving part to trigger circuit conversion to connect or disconnect a circuit. Currently, the commonly used travel switches provide switch control instructions by applying a pressing force. This type of design structure has certain limitations and cannot be used in places where switch control instructions are provided by applying a pulling force. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a travel switch that can be unlocked by applying a pulling force.

[0004] The technical solution adopted by the present invention is: a pull-to-unlock travel switch, which is composed of a zipper mechanism, a driving mechanism, a conversion mechanism, a signal output mechanism and a shell protection mechanism; the zipper mechanism includes a steel cable, a pull rod, a base, a locking spring, an end cover, a first screw, and a steel ball; the driving mechanism includes a push rod, a sliding sleeve, a driving spring, and a buffer pad; the conversion mechanism includes a switch assembly and a screw assembly; the output mechanism includes an electrical connector and a connecting wire; the shell protection mechanism includes a shell, a cover plate, and a second screw. The driving mechanism, the conversion mechanism, and the signal output mechanism are installed in the cavity formed by the shell protection mechanism; the zipper mechanism is positioned between the steel ball and the shell, and the locking spring provides a locking force between the zipper mechanism and the switch shell; the push rod of the driving mechanism extends out of the shell end face to receive control instructions, the push rod drives the sliding sleeve to achieve linkage, and the sliding sleeve then transmits the action instruction to the conversion mechanism to realize the conversion function of the switch circuit.

[0005] The advantages of the present invention are that the travel switch is designed with a zipper mechanism to achieve connection and locking with the switch housing, and when in use, the input of the switch control command is achieved by applying a pulling force, and the switching function of the switch circuit is completed through the composition of the switch structural parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural schematic diagram of the present invention (travel switch locked state).

[0007] Figure 2 It is a structural schematic diagram of the present invention (travel switch unlocked state).

[0008] Figure 3 It is a schematic diagram of the pull rod structure of the present invention.

[0009] Figure 4 It is a schematic diagram of the end cover structure of the present invention.

[0010] Figure 5 It is a schematic diagram of the shell structure of the present invention. DETAILED DESCRIPTION

[0011] The present invention is described in detail below with reference to the accompanying drawings and specific examples.

[0012] The present invention Figure 1 and Figure 2 As shown, it is composed of a zipper mechanism, a driving mechanism, a conversion mechanism, a signal output mechanism and a shell protection mechanism.

[0013] The zipper mechanism includes a steel cable 1, a pull rod 2, a base 3, a locking spring 4, an end cover 5, a first screw 6, and a steel ball 7. The pull rod 2 is installed in a cavity formed by the base 3 and the end cover 5. A locking spring 4 is installed above the push rod 2 to provide power for the movement of the pull rod 2. A circular hole 21 is designed at one end of the pull rod 2 extending out of the base 3 to install the steel cable 1. An annular groove 22 is designed at the lower end of the pull rod 2 to accommodate the retracted steel ball 7. The steel ball 7 is installed in an opening 31 of the end cover 5. The opening 31 is designed with a step 32 to prevent the steel ball 7 from falling out. The base 3 and the end cover 5 are fastened together and fixed by the first screw 6.

[0014] The driving mechanism includes a push rod 9, a sleeve 10, a driving spring 11, and a buffer pad 16. The push rod 9 is installed in an opening in the upper part of the shell 8. The sleeve 10 is installed under the push rod 9 to achieve linkage with the conversion mechanism. The driving spring 11 is installed in a cavity formed by the sleeve 10 and the cover plate 17. The driving spring 11 provides power for the axial movement of the push rod 9 and the sleeve 10. The buffer pad 16 is installed in the groove 44 of the shell 8 to absorb the impact energy caused by the ejection of the push rod 9 by deformation.

[0015] The conversion mechanism includes a switch assembly 12 and a screw assembly 13. The switch assembly 12 is fixed to the housing 8 by the screw assembly 13. The housing protection mechanism includes a housing 8, a cover plate 17, and a second screw 18. An annular groove 41 is designed on the upper part of the housing 8, which cooperates with the zipper mechanism to achieve the locking state of the switch. The housing 8 and the cover plate 17 are fastened together and fixed by the second screw 18. The output mechanism includes a connecting wire 14 and an electrical connector 15. The connecting wire 14 realizes the circuit connection between the switch assembly 12 and the electrical connector 15.

[0016] Workflow of the present invention:

[0017] The travel switch switches from the locked state to the unlocked state, such as Figure 1As shown, the pulling force is applied by the steel cable 1, driving the pull rod 2 to move upward axially against the elastic force of the locking spring 4. When the push rod moves upward for a certain distance, the steel ball 7 installed in the positioning hole 31 and the annular groove 41 is released from the annular groove 41 under the action of the radial component force and falls into the annular groove 22, thereby realizing the unlocking between the zipper mechanism and the housing 8. After the zipper mechanism is unlocked, the force acting on the push rod 9 is removed, and the push rod 9 and the sliding sleeve 10 move upward axially under the action of the driving spring 11. The sliding sleeve 10 drives the switch assembly 12 to move synchronously to realize the conversion of the circuit. The circuit conversion signal is output through the connecting wire 14 and the electrical connector 15. When the push rod 9 contacts the buffer pad 16, the push rod stops, and the push rod ejection process ends.

[0018] The travel switch switches from the unlocked state to the locked state, such as Figure 2 As shown, the pulling force is applied by the steel cable 1, driving the pull rod 2 to overcome the elastic force of the locking spring 4 and move axially upward. When the push rod moves up a certain stroke, the steel ball 7 falls into the annular groove 22 of the pull rod 2. At this time, the zipper mechanism is inserted into the cavity 42 on the upper part of the shell 8. The axial force applied by the zipper mechanism presses the push rod 9 downward. When the end face 33 of the zipper mechanism contacts the shell step 43, the pressing process of the zipper mechanism ends, and the steel cable 1 is released. The push rod 2 pops up axially downward under the elastic force of the locking spring 4. The steel ball 7 falls into the annular groove 41 on the upper part of the shell 8 under the action of the pull rod 2, realizing the locking between the zipper mechanism and the switch shell 8. The push rod 9 pressed down by the zipper mechanism drives the sliding sleeve 10 and the driving spring 11 to be pressed axially downward, and the switch assembly 12 linked with the driving mechanism completes the circuit conversion.

Claims

1. A pull-to-unlock travel switch, comprising a zipper mechanism, a drive mechanism, a conversion mechanism, a signal output mechanism and a housing protection mechanism, characterized in that: The zipper mechanism includes a steel cable 1, a pull rod 2, a base 3, a locking spring 4, an end cover 5, a first screw 6, and a steel ball 7. The pull rod 2 is installed in a cavity formed by the base 3 and the end cover 5. The locking spring 4 is installed above the push rod 2. The end of the pull rod 2 extending out of the base 3 is designed with a circular hole 21 for installing the steel cable 1. The lower end of the pull rod 2 is designed with an annular groove 22 for accommodating the retracted steel ball 7. The steel ball 7 is installed in an opening 31 of the end cover 5. The opening 31 is designed with a step 32 to prevent the steel ball 7 from falling out. The base 3 and the end cover 5 are fastened together and fixed by the first screw 6.

2. A pull-to-unlock travel switch according to claim 1, characterized in that: The driving mechanism includes a push rod 9, a sleeve 10, a driving spring 11, and a buffer pad 16. The push rod 9 is installed in an opening in the upper part of the shell 8. The sleeve 10 is installed under the push rod 9 to achieve linkage with the conversion mechanism. The driving spring 11 is installed in a cavity formed by the sleeve 10 and the cover plate 17, and the buffer pad 16 is installed in a groove 44 of the shell 8.

3. A pull-to-release travel switch according to claim 1, characterized in that: The shell protection mechanism comprises a shell 8 , a cover plate 17 , and a second screw 18 . An annular groove 41 is designed on the upper portion of the shell 8 . The shell 8 and the cover plate 17 are fastened together and fixed by the second screw 18 .

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