A jack contains: a body, an actuation rod, and a descending device. The body includes a first support sheet formed on an end thereof, and the actuation rod is movably received in the body and includes a second support sheet corresponding to the first support sheet. The actuation rod drives the first support and the second support to move away from each other in a first moving direction, and the actuation rod drives the first support and the second support to move close to each other in a second moving direction. Thereby, the jack is capable of expanding the commodity gradually and contains the descending device which is pressed to move the first support sheet and the second support sheet in the first moving direction or the second moving direction, thus retracting the jack gradually by pressing the adjustment grip repeatedly.

A jack contains: a body, an actuation rod, and a descending device. The body includes a first support sheet formed on an end thereof, and the actuation rod is movably received in the body and includes a second support sheet corresponding to the first support sheet. The actuation rod drives the first support and the second support to move away from each other in a first moving direction, and the actuation rod drives the first support and the second support to move close to each other in a second moving direction. Thereby, the jack is capable of expanding the commodity gradually and contains the descending device which is pressed to move the first support sheet and the second support sheet in the first moving direction or the second moving direction, thus retracting the jack gradually by pressing the adjustment grip repeatedly.

A jacking tool capable of achieving up-down fine adjustment is provided, and belongs to the technical field of jacking tools. The jacking tool includes a fixed portion and a lifting portion; the fixed portion includes a base and a guide rod arranged on the base; the lifting portion is provided with a lifting plate, a climbing mechanism, and an adjustment grip for controlling the climbing mechanism; the adjustment grip is pressed to actuate the climbing mechanism, to control the lifting portion and the lifting plate to move up along the guide rod; the lifting portion is further provided with a locking mechanism clamped to the guide rod; the locking mechanism restricts the lifting portion from moving down; the lifting plate is slidably arranged on the lifting portion.

A jacking tool capable of achieving up-down fine adjustment is provided, and belongs to the technical field of jacking tools. The jacking tool includes a fixed portion and a lifting portion; the fixed portion includes a base and a guide rod arranged on the base; the lifting portion is provided with a lifting plate, a climbing mechanism, and an adjustment grip for controlling the climbing mechanism; the adjustment grip is pressed to actuate the climbing mechanism, to control the lifting portion and the lifting plate to move up along the guide rod; the lifting portion is further provided with a locking mechanism clamped to the guide rod; the locking mechanism restricts the lifting portion from moving down; the lifting plate is slidably arranged on the lifting portion.

A hand-held jack has a main body, including a frame on a grip, the frame having a shaft hole passing through a first chamber and a second chamber therein, a jacking member being fixed to a front end of the frame; and a slow-down device. The slow-down device includes a swing seat pushed by the first spring and mounted in the second chamber; at least one shaft clamp and at least one restricting plate urged by a third spring that are disposed in a first accommodating groove and a second accommodating groove of the swing seat for clamping a lift shaft; and an eccentric push member having an eccentric portion resting on the restricting plate and a push portion. When a workpiece is lifted by the hand-held jack, the slow-down device lowers the workpiece slowly.

A hand-held jack has a main body, including a frame on a grip, the frame having a shaft hole passing through a first chamber and a second chamber therein, a jacking member being fixed to a front end of the frame; and a slow-down device. The slow-down device includes a swing seat pushed by the first spring and mounted in the second chamber; at least one shaft clamp and at least one restricting plate urged by a third spring that are disposed in a first accommodating groove and a second accommodating groove of the swing seat for clamping a lift shaft; and an eccentric push member having an eccentric portion resting on the restricting plate and a push portion. When a workpiece is lifted by the hand-held jack, the slow-down device lowers the workpiece slowly.

The disclosure relates to a descending stroke adjustable device for a lifting tool. The lifting tool includes a frame and a support rod. The support rod is axially arranged in a penetrating manner in the frame. A descending stroke adjustable device is mounted out of an upper end of the frame and includes a height descending device and a stroke adjusting device. The height descending device is penetrated by the support rod, and a descending stopping spring is compressively mounted between the height descending device and an upper end surface of the frame so that the height descending device and the support rod keep a descending stopping inclination angle; and the stroke adjusting device achieves an adjustable step-down stroke by accurately controlling an up-down moving range when the height descending device is pressed.

The disclosure relates to a descending stroke adjustable device for a lifting tool. The lifting tool includes a frame and a support rod. The support rod is axially arranged in a penetrating manner in the frame. A descending stroke adjustable device is mounted out of an upper end of the frame and includes a height descending device and a stroke adjusting device. The height descending device is penetrated by the support rod, and a descending stopping spring is compressively mounted between the height descending device and an upper end surface of the frame so that the height descending device and the support rod keep a descending stopping inclination angle; and the stroke adjusting device achieves an adjustable step-down stroke by accurately controlling an up-down moving range when the height descending device is pressed.

A friction lock bar jack for lifting items including an elongated bar having a distal end and a proximal end, a lifting mechanism reciprocally slidably carried by the elongated bar and including a toggle mounting body, an actuating lever pivotally coupled to the toggle mounting body and movable between a neutral position and a drive position and a toggle mechanism to frictional engage the elongated bar and move the toggle mounting body incrementally toward the distal end with the actuating lever in the drive position, and freely movable along the elongated bar with the actuating lever in the neutral position. A locking assembly is received about the elongated bar and carried by the lifting mechanism to selectively prevent movement of the lifting mechanism toward the proximal end and allow movement toward the distal end.

A friction lock bar jack for lifting items including an elongated bar having a distal end and a proximal end, a lifting mechanism reciprocally slidably carried by the elongated bar and including a toggle mounting body, an actuating lever pivotally coupled to the toggle mounting body and movable between a neutral position and a drive position and a toggle mechanism to frictional engage the elongated bar and move the toggle mounting body incrementally toward the distal end with the actuating lever in the drive position, and freely movable along the elongated bar with the actuating lever in the neutral position. A locking assembly is received about the elongated bar and carried by the lifting mechanism to selectively prevent movement of the lifting mechanism toward the proximal end and allow movement toward the distal end.