A lock includes a housing and a pivot is located in the insertion hole of the housing and has the first end thereof connected with a slide. A spring is received in the insertion hole, biases the second end of the pivot. When the slide is positioned at a close position, the slide is applied by the resilient force of the spring as to cover the installation recess so as to prevent dust and water from entering the core. When the slide is positioned at an open position, the slide is applied by a force to overcome the resilient force of the spring, and at least one portion of the slide does not cover the installation recess for convenience of unlocking the lock or replacement of the core. The housing includes a positioning member which positions the cover at open and close positions of the slide.

A lock includes a housing having an insertion hole in which a pivot is inserted. A slide is connected to one end of the pivot. A spring is located in the insertion hole and applies a first resilient force toward the insertion hole, and a second resilient force toward a direction that the slide pivots. When the slide is located at a first position, the installation recess is covered by the slide to prevent water and dust from entering into the installation recess. When the slide located at a second position, at least one portion of the slide does not cover the installation recess to allow the lock to be unlocked. When the slide located at a third position, the slide is located higher than the first end face of the protrusion and is pivotable so that the installation recess is explored for convenience of replacement of the core.

Described herein are example fluid guards that can be used with locking devices. Various aspects may be particularly applicable to electrical locks, but they may also be applicable to mechanical locks. A locking device guard can include a guard cover, a fluid absorber, and a coupling element. The fluid absorber can be configured in a closed configuration to fit at least partially within a cup of a lock face. The coupling element can be configured to couple the guard cover to the lock and can define a second axis. The coupling element can be configured to allow the guard cover to rotate about the second axis.