Abstract: A secure locking mechanism for pushbutton control box, including a box body and a locking mechanism. The locking mechanism includes several secure locking switches and multiple rotary buttons. The secure locking switches are arranged on a controlling circuit board and serially connected with corresponding control switches disposed thereon. The secure locking switches are movable between an ON position and an OFF position to control electronic signal transmission of the control switches. Each rotary button has a locking body eccentrically disposed on an end face of the rotary button for controlling making/breaking of the secure locking switch. An operator can operate the rotary buttons from outer side of the box body to ensure security. By means of varying the type of serial connection, each secure locking switch can flexibly control electronic signal transmission of one single control switch or plural or even all control switches of the pushbutton control box.

Abstract: An anti-extraction device for connectors, including two identical latch members that are mated with each other to enclose two coaxially connected connectors of different cables and restrict the connectors from axially displacing. Each latch member has a body section defining a cavity axially extending between two ends of the body section. Two narrowed openings are formed at two ends of the body section in communication with the cavity. A first engaging section and a second engaging section complementary thereto are disposed on two sides of the body section. After the latch members are mated, the cavities together form a chamber for accommodating the connectors therein. Also, the narrowed openings together form two narrowed passages at two ends of the chamber for the cables to pass through. The narrowed passages have a diameter smaller than that of the connectors for restricting the connectors in the chamber without detaching from each other.