Abstract: A pneumatic hydraulic retractable device includes a fluid pressure cylinder having a cylinder body and a plug seat disposed in the cylinder body, a piston rod movably disposed in the fluid pressure cylinder, a control valve set having a valve seat disposed at the piston rod and forms an upper fluid chamber and a lower fluid chamber with the cylinder body therebetween, and a valve rod disposed in the valve seat for controlling communication between the upper and lower fluid chambers, and a pressure relief element forming a pressure relief gap with the piston rod. The pressure relief gap communicates with the lower fluid chamber through a communication portion of the pressure relief element. As such, when the valve rod is opened, the fluid is allowed to flow between the lower fluid chamber and the pressure relief gap through the communication portion for reducing airtight effect.

Abstract: A pneumatic hydraulic retractable device includes a fluid pressure cylinder having a cylinder body and a plug seat disposed in the cylinder body, a piston rod movably disposed in the fluid pressure cylinder, a control valve set having a valve seat disposed at the piston rod and forms an upper fluid chamber and a lower fluid chamber with the cylinder body therebetween, and a valve rod disposed in the valve seat for controlling communication between the upper and lower fluid chambers, and a pressure relief element forming a pressure relief gap with the piston rod. The pressure relief gap communicates with the lower fluid chamber through a communication portion of the pressure relief element. As such, when the valve rod is opened, the fluid is allowed to flow between the lower fluid chamber and the pressure relief gap through the communication portion for reducing airtight effect.

Abstract: The present invention illustrates an electrical connector for detachable installation in a bicycle frame, which is detachably installed in a lower fork of a bicycle frame and includes a fixed seat and an inserted seat. The fixed seat is installed in the aforementioned lower fork. The fixed seat is hollow in shape. The inserted seat is inserted in the fixed seat movably back and forth. The inserted seat has a first end surface, a second end surface opposite to the first end surface, and a core shaft installation hole penetrating through the first and second end surfaces. The first end surface of the inserted seat is provided with a set of electrically conductive structure. As a result, when a wheel hub motor is installed on the bicycle frame, the electrical connector is able to be pushed to be electrically connected with the wheel hub motor as needed.

Abstract: A pneumatic-hydraulic control valve includes a valve base and a valve stem movably disposed in the valve base. A first inner oil guiding hole of the valve stem communicates with a first outer oil guiding hole of the valve base. A second inner oil guiding hole of the valve stem does not communicate with a second outer oil guiding hole of the valve base when the valve stem is closed, and communicates with the second outer oil guiding hole of the valve base when the valve stem is opened. Further, the valve stem has a first stressed portion for bearing a fluid closing force and a second stressed portion for bearing a fluid opening force. The outer diameter of the first stressed portion is larger than that of the second stressed portion. Thus, the present invention reduces a valve opening force without affecting the sealing effect.

Abstract: A pneumatic-hydraulic control valve includes a valve base and a valve stem movably disposed in the valve base. A first inner oil guiding hole of the valve stem communicates with a first outer oil guiding hole of the valve base. A second inner oil guiding hole of the valve stem does not communicate with a second outer oil guiding hole of the valve base when the valve stem is closed, and communicates with the second outer oil guiding hole of the valve base when the valve stem is opened. Further, the valve stem has a first stressed portion for bearing a fluid closing force and a second stressed portion for bearing a fluid opening force. The outer diameter of the first stressed portion is larger than that of the second stressed portion. Thus, the present invention reduces a valve opening force without affecting the sealing effect.

Abstract: A pneumatic and hydraulic elevating seat tube assembly of a bicycle includes an outer tube and a movable inner tube in the outer tube. An elevating adjustment unit in the movable inner tube has a fixed inner tube in the movable inner tube, a fixed piston in the fixed inner tube, a floating piston in the fixed inner tube, and an elastic isolator in the floating piston which is between a bottom end of the movable inner tube and the fixed piston so that a gas chamber is formed between the floating piston and the movable inner tube and a lower oil chamber is formed between the floating piston and the fixed piston. The elastic isolator has first and second annular grooves facing toward the lower oil chamber and the gas chamber respectively. The elastic isolator under pressure is extended radially, thereby effective in isolating oil from gas positively.

Abstract: A pneumatic and hydraulic elevating seat tube assembly of a bicycle includes an outer tube and a movable inner tube in the outer tube. An elevating adjustment unit in the movable inner tube has a fixed inner tube in the movable inner tube, a fixed piston in the fixed inner tube, a floating piston in the fixed inner tube, and an elastic isolator in the floating piston which is between a bottom end of the movable inner tube and the fixed piston so that a gas chamber is formed between the floating piston and the movable inner tube and a lower oil chamber is formed between the floating piston and the fixed piston. The elastic isolator has first and second annular grooves facing toward the lower oil chamber and the gas chamber respectively. The elastic isolator under pressure is extended radially, thereby effective in isolating oil from gas positively.

Abstract: A tricycle comprises a front tube, a handlebar frame, a front fork, a front wheel, two footboard frames, and a swiveling member. The handlebar frame is received in the front tube. The front fork is disposed at the bottom end of the handlebar frame for fastening the front wheel. The two footboard frames are pivoted with the front tube and are formed of a bottom tube, a footboard, and a rear wheel. The bottom tube is provided with a through hole to accommodate a buffer member such that the buffer member is pivoted with the rear end of the front tube. The swiveling member is provided in two sides with two insertion pillars which are connected with the buffer member.

Abstract: A foldable tricycle comprises two footboards which are formed of a front tube and a rear tube. A folding mechanism is disposed between the front tube and the rear tube and is formed of a pivoting plate extending from the rear end of the front tube, a pivoting seat extending from the front end of the rear tube, and at least one locating member disposed on the pivoting seat. The pivoting plate is pivoted with the pivoting seat such that they are detachably located by the locating member at two opposite positions, thereby enabling the tricycle to be folded.

Abstract: A fast dismantling device comprises two C-shaped fitting rings, two shaft bolts, two pivots, two dial rods, and a connection rod. The fitting rings are provided with a through hole and are fitted over an outer tube. The shaft bolts include a head and a shank which is received in the through hole of the fitting rings. The pivots are disposed at the free ends of the shanks of the shaft bolts. The dial rods comprise a cam portion which is formed of two actuation pieces. The shaft bolts are disposed between the two actuation pieces. The actuation pieces are provided with a through hole for receiving the pivot. The connection rod is connected at both ends thereof with the dial rods. As the connection rod is wrenched to actuate the dial rods, the fast dismantling device is capable of fastening or unfastening simultaneously two pairs of inner and outer tubes.

Abstract: A rod bending mechanism is disposed between a first segment and a second segment of the rod and is formed of a pivoting plate extending from one end of the first segment, a pivoting seat having two side plates extending from one end of the second segment, and at least one locating member disposed on one of the two side plates. The pivoting plate is pivoted with the pivoting seat such that the pivoting plate and the pivoting seat are located by the locating member.

Abstract: A tricycle comprises a front tube, a handlebar frame, a front fork, a front wheel, two footboards, and a swiveling member. The handlebar frame is put through the front tube. The front fork is fastened with the bottom end of the handlebar frame for fastening the front wheel. The two footboards are pivoted with the front tube and are formed of a bottom tube, a step board, and a rear wheel. The swiveling member is pivoted with the front tube and is provided at the top end the bottom end with a cross rod. The two cross rods are arranged at an interval between the two bottom tubes.

Abstract: A fast dismantling device comprises two C-shaped fitting rings, two shaft bolts, two pivots, two dial rods, and a connection rod. The fitting rings are provided with a through hole and are fitted over an outer tube. The shaft bolts comprise a head and a shank which is received in the through hole of the fitting rings. The pivots are disposed at the free ends of the shanks of the shaft bolts. The dial rods comprise a cam portion which is formed of two actuation pieces. The shaft bolts are disposed between the two actuation pieces. The actuation pieces are provided with a through hole for receiving the pivot. The connection rod is connected at both ends thereof with the dial rods. As the connection rod is wrenched to actuate the dial rods, the fast dismantling device is capable of fastening or unfastening simultaneously two pairs of inner and outer tubes.

Abstract: A skateboard wheel mount comprises a base, an axle, and a torsion spring. The base is formed of a front plate and a rear plate and is fastened with the underside of a deck of the skateboard such that the front plate and the deck form a predetermined angle. The front plate is provided with a stop piece extending therefrom. The axle is pivoted by a spindle between the front plate and the rear plate and is provided with an urging piece extending therefrom such that the urging piece is located under the stop piece. The torsion spring is fitted over the front segment of the spindle for cushioning the wheel mount and for correcting the direction in which the axle turns.

Abstract: A foldable tricycle comprises two footboards which are formed of a front tube and a rear tube. A folding mechanism is disposed between the front tube and the rear tube and is formed of a pivoting plate extending from the rear end of the front tube, a pivoting seat extending from the front end of the rear tube, and at least one locating member disposed on the pivoting seat. The pivoting plate is pivoted with the pivoting seat such that they are detachably located by the locating member at two opposite positions, thereby enabling the tricycle to be folded.

Abstract: A tricycle is formed of a front tube, a handlebar set fastened pivotally with the front tube, a front fork pivoted with the handlebar set, a front wheel pivoted to the front fork, two swiveling members fastened pivotally with the front tube, two footboards fastened with the swiveling members, and two rear wheels fastened pivotally to the underside of the rear end of the two footboards. The footboards are provided in the upper side with an inclined tread surface to minimize the likelihood that the ankle of a rider of the tricycle is injured.

Abstract: A rod bending mechanism is disposed between a first segment and a second segment of the rod and is formed of a pivoting plate extending from one end of the first segment, a pivoting seat having two side plates extending from one end of the second segment, and at least one locating member disposed on one of the two side plates. The pivoting plate is pivoted with the pivoting seat such that the pivoting plate and the pivoting seat are located by the locating member.

Abstract: A front wheel adjustment device of a tricycle comprises a front fork, a front wheel, and a shaft. The front fork comprises two side wings, with each being provided with a connection portion. The connection portion is provided with a through hole. The front wheel is provided at the center with a shaft hole. The pivot is received in the shaft hole of the front wheel and the through holes of the front fork.

Abstract: A tricycle comprises a front tube, a handlebar frame, a front fork, a front wheel, two footboard frames, and a swiveling member. The handlebar frame is received in the front tube. The front fork is disposed at the bottom end of the handlebar frame for fastening the front wheel. The two footboard frames are pivoted with the front tube and are formed of a bottom tube, a footboard, and a rear wheel. The bottom tube is provided with a through hole to accommodate a buffer member such that the buffer member is pivoted with the rear end of the front tube. The swiveling member is provided in two sides with two insertion pillars which are connected with the buffer member.