| 摘要 |
An electric control device for an outdoor lamp includes a control box having a side wall that is formed with a through hole, and a rotary-type variable resistance switch having a main switch housing that is disposed inside the control box and an externally threaded tubular sleeve that extends frontwardly from the main switch housing and through the through hole of the control box. The switch further has a rotatable switch arm which extends axially and rotatably from an interior of the main switch housing and through the tubular sleeve. A nut retains the switch on the control box and is threaded internally to engage the tubular sleeve. The nut has an outer peripheral surface which is formed with at least one annular peripheral groove. A resilient washer is provided on a rear face of the nut and is pressed by the nut to contact tightly the side wall of the control box. An O-ring is provided on the nut in each annular peripheral groove. The switch further includes a cap with a rear end that is formed with a recess. The switch arm extends into the recess and is mounted securely to the cap. The nut is confined within the recess of the cap such that each O-ring is in tight contact with an inner wall surface of the cap.
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