Abstract: A pneumatic oil pump has a cylinder, a piston, a pedal and an oil reservoir. The cylinder has a central bore, a sealed front end and a sealed rear end. An air connector is mounted in a cover on the front end of the cylinder. An actuating valve is mounted in the cover on the front end of the cylinder and communicating with the air connector and the central bore of the cylinder. The piston is movably mounted in the bore of the cylinder to divide the central bore of the cylinder into a first chamber and a second chamber. A piston seat is attached to the piston at an end facing the rear end of the cylinder. A ventilative, sound-absorbing material is arranged between the air outlets of the piston and the piston seat. By such an arrangement, the shock of the air flow can be absorbed by the ventilative, sound absorbing material. Therefore, noise and shock will not occur when the pneumatic pump is in operation.

Abstract: The present invention provides an improved showerhead that can select the type of water steam by a single hand. A movable flapper is mounted in the showerhead, and a button connected to the flapper is pivotally mounted on the outside of the shell of the showerhead. A first outlet is defined on one surface of a water-separating plate and connects with a slant hole of a spacing block, a second outlet is defined on one surface of the water-separating plate and connects with a plurality of holes on the plate. Therefore, the water stream can be force to exit from the first or the second hole by rotating the flapper so that the water stream will exit through the slant hole in the spacing block or the plural holes in the water-separating plate.

Abstract: A tool suspension rack includes an elongated flat rack body having two opposite end portions and two opposite sides, a handgrip formed on one of the two end portions of the rack body, a plurality of coupling bars formed on each of the two sides of the rack body, and two juxtaposed upright clamping pieces each having a first end portion formed on the rack body and a second end portion formed with an arcuate limiting flange facing each other.

Abstract: A jack assembly includes two lower arms each having an upper end portion and a lower end portion pivotally attached to a base, two upper arms each having an upper end portion pivotally mounted to a support bracket and a lower end portion pivotally mounted to the upper end portion of one of the two respective lower arms, a drive shaft having two end portions each rotatably extending through the connection of the lower end portion of one of the two respective upper arms and the upper end portion of one of the two respective lower arms, and an drive device including a drive gear train driven by a motor so as to rotate the drive shaft electrically, and a drive nut driven by a tool such as a socket so as to rotate the drive shaft manually. In such a manner, the jack assembly can be operated manually or electrically.

Abstract: A lighting device is provided for a stun gun which includes a body portion having one end portion containing a receiving space having two side walls, two juxtaposed electric shock rods extending outward from the end portion of the body portion with the receiving space located therebetween, a power supply received in the body portion for supplying electricity to each of the two electric shock rods, and two opposite flexible electrodes each mounted on one of the two side walls of the receiving space and each electrically connected to the power supply.

Abstract: A brushless DC fan driver is disclosed, which includes an amplifier, a pulse generator and a driving unit for rotating a fan, and further includes a tachometer unit, a lock protection unit and an overshoot voltage prevention unit for providing a reliable driving capability. The tachometer unit is provided to present a signal representing the rotation speed of the fan based on an amplified alternative polarity signal from a Hall sensor in the fan. The lock protection unit is provided to detect that the fan is locked up based on the amplified alternative polarity signal thereby generating a lock signal to shut down the fan driver and a restart signal to attempt to restart the locked fan. The overshoot voltage prevention unit is connected to the driving unit for detecting and bypassing overshoot voltages generated by the fan in operation.

Abstract: A tension adjusting device for a packing machine using plastic film includes a shaft with a plastic film roll mounted thereto which is pressed by a press member. An axle extends centrally from the press member and is connected to a plate which extends radially and outwardly from a first rotatable rod. The shaft has an end member with which a belt is engaged which has a first end fixedly connected to a first fixed position. A first gear is fixedly connected to the first rotatable rod and a second rotatable rod is located in parallel with the first rotatable rod with a second gear connected to the second rotatable rod and engaged with the first gear. A third gear is connected to the second rotatable rod and has a chain engaged therewith which has one end thereof fixedly connected to a second fixed position and the other end thereof connected to a second end of the belt via a spring so that when the third gear is rotated, the belt is loosened or tightened.