Abstract: A lockable manhole cover includes, for example, a manhole cover installable in an opening in a manhole frame, a locking member attached via a pin and slot arrangement beneath the manhole cover, and a lever pivotally attached to the manhole cover. A lower end portion of the lever is operably engageable with the locking member to move the locking member relative to the manhole cover. The lever is disposable in a lowered position so that an end portion of the locking member is operably engageable with a portion of the manhole frame for use in inhibiting removal of the lockable manhole cover from the manhole frame. The lever is disposable in a raised position so that the end portion of the locking member is operably disengageable with the portion of the manhole frame to allow removal or installation of the lockable manhole cover from or in the manhole frame.

Abstract: A locking assembly attachable to a manhole cover includes an arm disposable in a lowered position with the arm disposed in a first orientation engageable with a manhole frame supporting the manhole cover to inhibit removal of the manhole cover from a manhole frame, and disposable in a raised position and in a second orientation operable to allow removal of the manhole cover from the manhole frame. In an embodiment, the locking assembly may include the arm attached to a movable member having a spiral, helix, or curved groove and in which the movable arm is receivable in a bushing and a pin receivable in the groove.

Abstract: A lockable manhole cover incudes, for example, a manhole cover installable in an opening in a manhole frame, a locking member attached via a pin and slot arrangement beneath the manhole cover, and a lever pivotally attached to the manhole cover. A lower end portion of the lever is operably engageable with the locking member to move the locking member relative to the manhole cover. The lever is disposable in a lowered position so that an end portion of the locking member is operably engageable with a portion of the manhole frame for use in inhibiting removal of the lockable manhole cover from the manhole frame. The lever is disposable in a raised position so that the end portion of the locking member is operably disengageable with the portion of the manhole frame to allow removal or installation of the lockable manhole cover from or in the manhole frame.

Abstract: A locking assembly attachable to a manhole cover includes an arm disposable in a lowered position with the arm disposed in a first orientation engageable with a manhole frame supporting the manhole cover to inhibit removal of the manhole cover from a manhole frame, and disposable in a raised position and in a second orientation operable to allow removal of the manhole cover from the manhole frame. In an embodiment, the locking assembly may include the arm attached to a movable member having a spiral, helix, or curved groove and in which the movable arm is receivable in a bushing and a pin receivable in the groove.