Three-point latch for switch cabinet

In a switch cabinet latch of the type having a cabinet body and a door hinged thereto which may be held in closed position by a door-mounted push-rod lock along a closing edge, the lock having push rods extending therefrom and an actuating element which when rotated moves the push rods axially, the push rods having closing ends which in the closed position reach behind closing faces mounted on the cabinet body and in the open position are away from the closing faces, the improvement comprising:

• rollers rotatably mounted on the closing ends on the push rods;
• the push rods having free ends and the closing ends being separate parts connected to the push-rod free ends;
• each closing end and its respective push rod being held between a pair of guide parts;
• sleeve-shaped guide housings connected to the cabinet door, each pair of guide parts and the closing end therebetween being guided within one of said guide housings;
• lock blocks mounted on the cabinet body, each block having one of said closing faces facing away from the door and a transition surface at an acute angle to the direction of push-rod movement facing away from the cabinet door, such that turning of the actuating element moves the rollers from the open position first against the transition surfaces to impart a closing movement to the door and then onto the closing faces;
• the closing ends having lock surfaces inclined toward the door in position to cooperate with the closing-block transition surfaces to clamp the door against the cabinet body;
• a holding block mounted on the cabinet body;
• and
• a hasp on the actuating element with a locking nose extending radially therefrom positioned such that further turning of the actuating element moves the locking nose behind the holding block to clamp the door to the cabinet body in the area of the push-rod lock.

In a switch cabinet latch of the type having a cabinet body and a door hinged thereto which may be held in closed position by a door-mounted push-rod lock along a closing edge, the lock having push rods extending therefrom and an actuating element which when rotated moves the push rods axially, the push rods having closing ends which in the closed position reach behind closing faces mounted on the cabinet body and in the open position are away from the closing faces, the improvement comprising:

• rollers rotatably mounted on the closing ends on the push rods;
• lock blocks mounted on the cabinet body, each block having one of said closing faces facing away from the door and a transition surface at an acute angle to the direction of push-rod movement facing away from the cabinet door such that turning of the actuating element moves the rollers from the open position first against the transition surfaces to impart a closing movement to the door and then onto the closing faces, said lock blocks each having a locking ridge between the transition surface and the back side thereof which said rollers pass over in movement between the transition surface and the back side, said locking ridges serving to maintain the rollers behind the lock blocks when the door is fully closed;
• the closing ends having lock surface inclined toward the door in position to cooperate with the closing-block transition surfaces to clamp the door against the cabinet body;
• a holding block mounted on the cabinet body;
• and
• a hasp on the actuating element with a locking nose extending radially therefrom positioned such that further turning of the actuating element moves the locking nose behind the holding block to clamp the door to the cabinet body in the area of the push-rod lock.

In a switch cabinet latch of the type having a cabinet body and a door hinged thereto which may be held in closed position by a door-mounted push-rod lock along a closing edge, the lock having push rods extending therefrom and an actuating element which when rotated moves the push rods axially, the push rods having closing ends which in the closed position reach behind closing faces mounted on the cabinet body and in the open position are away from the closing faces, the improvement comprising:

• rollers rotatably mounted on the closing ends on the push rods, said rollers having axes of rotation which are substantially parallel to the cabinet door and substantially perpendicular to the closing edge;
• the push rods having free ends and the closing ends being separate parts connected to the push-rod free ends;
• each closing end and its respective push rod being held between a pair of guide parts;
• sleeve-shaped guide housings connected to the cabinet door, each pair of guide parts and the closing end therebetween being guided within one of said guide housings;
• lock blocks mounted on the cabinet body, each block having one of said closing faces facing away from the door and a transition surface at an acute angle to the direction of push-rod movement facing away from the cabinet door, such that turning of the actuating element moves the rollers from the open position first against the transition surfaces to impart a closing movement to the door and then onto the closing faces;
• each closing end having:
• a lock surface inclined toward and facing the door in position to cooperate with one of the closing-block transition surfaces to clamp the door against the cabinet body;
• and two bearing plates in position away from the push rods with the roller rotatably mounted therebetween, said inclined closing end lock surface adjoining the bearing plates;
• a holding block mounted on the cabinet body;
• a hasp on the actuating element with a locking nose extending radially therefrom positioned such that further turning of the actuating element moves the locking nose behind the holding block to clamp the door to the cabinet body in the area of the push-rod lock;
• and
• the cabinet body having a frame which forms a sealing edge along the open side of the cabinet body and the inside of the door having a sealing element along the outer edge thereof positioned to engage the sealing edge of the cabinet body, whereby the door may be sealed tightly closed.