Disclosed is an unlocking device, battery replacing platform and movable battery replacing platform. The unlocking device comprises: a guide rail; a movable seat mounted on the guide rail; an unlocking ejector rod vertically mounted on the movable seat; and a driving member to drive the movable seat to move horizontally along a plane of the guide rail, the driving member is a driving push rod; the movable seat mounted on the guide rail includes a fixing cylinder fixed vertically mounted direct on the movable seat, and the unlocking ejector rod is movably mounted inside of the fixing cylinder, and a second spring is provided in the fixing cylinder, the second spring is configured to apply an upward thrust to the unlocking ejector rod. The unlocking ejector rod can be controlled to move on the predetermined rail, and the battery locking mechanism on the electric vehicle can be automatically unlocked.

A movable battery replacing platform includes a travel-driving portion used for driving the movable battery replacing platform to move on the ground; a lifting portion mounted on the travel-driving portion, for lifting a battery during the replacement of the battery; and a battery mounting portion mounted on the top of the lifting portion, for placing a battery to be replaced or a replaced battery. The battery mounting porting is provided with a battery replacing device. The device can use an unlocking device to unlock a battery locked on the bottom of an electric vehicle, automatically aligning an unlocking point of a battery locking mechanism and realizing automatic unlocking in the movement. The angle of an upper board relative to the battery unlocking position can be adjusted by a movement actuating device, so that the unlocking point of the battery can automatically fit where the movable battery replacing platform remains still.

An under hoist support stand in which the spin handle to turn the threaded support screw can be selectively engaged and disengaged from the support screw and allows the screw to be positioned along a longitudinal axis of the support stand.

A lifting mechanism for gym equipment to provide height adjustment of the gym equipment and reduction of the thickness of the mechanism, having a bracket, a bearing rotational shaft, bearing wheels, a sleeve pipe, and a driver; the bracket is mounted to a gym equipment structural frame; the bearing rotational shaft is rotationally mounted between two ends of the bracket, a peripheral surface of the bearing rotational shaft is connected to linkage arms orienting to a same direction, and a wheel is mounted to each linkage arm; the sleeve pipe is pivotally connected to the bracket; the driver is pivotally connected to the bracket; an output end of the driver is a screw bolt; the screw bolt passes through the sleeve pipe.

A system and method for raising a structure, or part thereof, the system comprising vertical jack members connected and disposed about a rail system attached about the periphery of the structure. The vertical jack members comprise an outer sleeve and a slidable inner portion that is driven vertically by a jack screw and drive block. Extensible diagonal cross-braces stabilize the jack members and structure being raised.

A grinding mill for pulverizing material includes a platform having an upper surface and defining a recess having a floor, the recess configured to seat a dish in which the material is disposed, and a movable securing frame that is movably connected with the platform, the frame including a lift support having an upper surface that is movable along a path from a first location that is beneath the floor of the recess, through the recess, to a second location that is coplanar with the upper surface of the platform. A motor configured to cause oscillation of the platform and the movable securing frame can be used. A method of using the grinding mill can include placing a dish above a recess defined by an upper surface of a platform, and lowering the frame with respect to the platform, thereby seating the dish within the recess.

A tire carrier and vehicle lift apparatus is disclosed. A scissor jack includes a first bracket fixed to the jack, the first bracket to removably mount the jack to a vehicle. The apparatus also includes a second bracket fixed to the jack opposite the first bracket, the second bracket to hold a wheel for the vehicle, wherein operation of the jack while the bracket is mounted to the vehicle is to lower the wheel toward the ground.

A lifting apparatus having at least one column. The column includes a drive that rotates a screw, the drive having a first width in a first area, and a nut housing having a support connected to a nut, the nut threaded around the screw such that rotation of the screw moves the nut and support along a first axis. The support including two parallel walls spaced apart a distance larger than the first width such that when the support is positioned at a bottom end of the screw, the two parallel walls fit over the first area. A minimum height of the support is measured from a base of the column to a lowest point of the support. The minimum height is between zero and a width between the two parallel walls.

A leveling and stabilizing jack includes an intermediate member joining first and second lifting sections. Each lifting section includes a cross beam, a leg, a brace, a foot, a motor and a drive screw. The motor powers the drive screw, which is operably associated with the leg, to cause the leg to extend away from or retract toward the cross beam depending on the motor's direction of rotation. A motor control can control the motor of each of the lifting sections independently in a manner that results in leveling of the jack when deployed.

Kit-of-parts comprising: an outer post and an inner post with an external screw thread, that are rotationally locked and extendable relative to each other; a nut configured to be driven along the external screw thread to selectively secure the inner post relative to the outer post in a drive mode; anda drive, comprising a drive housing accommodating a drive motor, and a connector configured to connect the drive housing with the nut and thereby connect the drive motor with a transmission; wherein the nut comprises: a housing; a rotatable member that is rotatably arranged in the housing, wherein said rotatable member comprises an internal screw thread that is configured to form a mating engagement with the external screw thread; the transmission arranged in the housing and comprising an input shaft that is connectable to the drive, wherein said transmission is configured to selectively: rotate the rotatable member relative to the housing in the drive mode; andform a coupling between the housing and the rotatable member in a manual mode wherein the nut is further configured to be moved manually along the external screw thread, the coupling causing the rotatable member and the housing to jointly rotate relative to the external screw thread, thereby moving the nut in the longitudinal direction along the external screw thread.