A chassis device and its cover structure and lifting mechanism, the chassis structure includes a chassis, a cover and a lifting mechanism further including a first magnetic member fixed to the cover, a second magnetic member fixed to the chassis; a movable sleeve sheathed on the second magnetic member and capable of sliding with respect to the second magnetic member, an elastic element installed between the chassis and the movable sleeve and pushing the movable sleeve away from the chassis to resume its original position, and a third magnetic member fixed to the movable sleeve, and the third magnetic member has a side attracted or repelled with respect to the first magnetic member and the other side attracted or repelled with respect to the second magnetic member. The second and third magnetic members have a magnetic attraction force greater than an elastic restoring force of the elastic element.

A door closer system having a door closer that includes at least one sensor configured to sense an operating characteristic or condition relating to the door closer including a position or speed of displacement of at least a portion of the door closer or an associated entryway device. The sensor(s) can also provide information relating to the performance or condition of one or more components of the door closer, such as the operation of a backcheck mechanism, as well as tracking the number of door cycles. Information obtained by the sensor(s) of the door closer system can be communicated to a lockset device of an entryway control system. The lockset device can be configured to communicate information received from the door closer system to an access control system, which can in turn provide the communicated information to a management system.

A door closer system having a door closer that includes at least one sensor configured to sense an operating characteristic or condition relating to the door closer including a position or speed of displacement of at least a portion of the door closer or an associated entryway device. The sensor(s) can also provide information relating to the performance or condition of one or more components of the door closer, such as the operation of a backcheck mechanism, as well as tracking the number of door cycles. Information obtained by the sensor(s) of the door closer system can be communicated to a lockset device of an entryway control system. The lockset device can be configured to communicate information received from the door closer system to an access control system, which can in turn provide the communicated information to a management system.

A magnetic latch (10) for an appliance is disclosed for use with a strike plate (12). The latch includes a body (16) having two oppositely disposed side walls (18) and a bottom surface or wall (20). The body defines a magnet recess (26). An elongated handle (40) is pivotally coupled to the body. A spring loaded plunger pin (34) biases the handle. A magnet assembly (44) is positioned within the body. The magnet assembly includes a magnet (46) having a peripheral edge (48), and a pair of metal plates (54). The magnet has a peripheral cushioning sleeve (58) extending about the peripheral edges of the magnet. The peripheral sleeve is generally rectangular in shape having two oppositely disposed end walls (60) which include a cushioning projection (68). A pivot pin (74) extends through the magnet assembly to allow rocking motion.

A magnetic latch (10) for an appliance is disclosed for use with a strike plate (12). The latch includes a body (16) having two oppositely disposed side walls (18) and a bottom surface or wall (20). The body defines a magnet recess (26). An elongated handle (40) is pivotally coupled to the body. A spring loaded plunger pin (34) biases the handle. A magnet assembly (44) is positioned within the body. The magnet assembly includes a magnet (46) having a peripheral edge (48), and a pair of metal plates (54). The magnet has a peripheral cushioning sleeve (58) extending about the peripheral edges of the magnet. The peripheral sleeve is generally rectangular in shape having two oppositely disposed end walls (60) which include a cushioning projection (68). A pivot pin (74) extends through the magnet assembly to allow rocking motion.

Disclosed is a safety magnetic hinge for preventing a door from being suddenly closed by wind, by, when the hinge opens, fixing the hinge so as not to close at a predetermined angle through a magnet installed in the hinge.

Disclosed is a safety magnetic hinge for preventing a door from being suddenly closed by wind, by, when the hinge opens, fixing the hinge so as not to close at a predetermined angle through a magnet installed in the hinge.

The present invention relates to the technical field of door closers, and particularly discloses an electromagnetic release door closer. The electromagnetic release door closer comprises a door closer body, a slide rail, and a rocker arm, one end of the rocker arm is articulated with the door closer body, wherein the slide rail is provided with a slide groove and a slide cavity which are parallel to each other, a through slot which is parallel to the slide groove is arranged between the slide groove and the slide cavity, wherein an electromagnetic limiting mechanism can be fixed at any position in the slide cavity. In the electrified state of an electromagnet, an electromagnetic attracting plate and the electromagnet are in a fixed state under the action of magnetic force, a limiting latch bolt is located in the slide groove, and is used to limit the sliding of a slider in the slide groove, and under this state, the slider can slide freely between the limiting latch bolt and one end of the slide groove, that is, a door leaf can move freely between a position limited by the limiting latch bolt and a maximum opening position. The defect that a door leaf can only be fixed in one specific state in the prior art is overcome, the range of adjustment is wider, and the electromagnetic release door closer is more convenient to use, and can meet more use requirements.

The present invention relates to the technical field of door closers, and particularly discloses an electromagnetic release door closer. The electromagnetic release door closer comprises a door closer body, a slide rail, and a rocker arm, one end of the rocker arm is articulated with the door closer body, wherein the slide rail is provided with a slide groove and a slide cavity which are parallel to each other, a through slot which is parallel to the slide groove is arranged between the slide groove and the slide cavity, wherein an electromagnetic limiting mechanism can be fixed at any position in the slide cavity. In the electrified state of an electromagnet, an electromagnetic attracting plate and the electromagnet are in a fixed state under the action of magnetic force, a limiting latch bolt is located in the slide groove, and is used to limit the sliding of a slider in the slide groove, and under this state, the slider can slide freely between the limiting latch bolt and one end of the slide groove, that is, a door leaf can move freely between a position limited by the limiting latch bolt and a maximum opening position. The defect that a door leaf can only be fixed in one specific state in the prior art is overcome, the range of adjustment is wider, and the electromagnetic release door closer is more convenient to use, and can meet more use requirements.

A door position sensor of an electromagnetic door lock. The electromagnetic lock also includes an electromagnet and a strike plate. The electromagnet is secured to the door frame and the strike plate is movably mounted to the door so that a controlled amount of door movement in the opening direction is permitted while the strike plate remains in contact with an energized electromagnet. The door position sensor may comprise a sensor in or on the electromagnet and a permanent magnet mounted to the door and disposed in proximity to the sensor when the door is in a closed position. The sensor may be a reed switch or a Hall Effect sensor. The permanent magnet and strike plate may be mounted to the door by a mounting tray. The mounting tray may include indicia to aid in providing a proper alignment of the strike plate to the door and electromagnet.