Abstract: An electric caulking gun is provided with a clutch. The clutch is connected to a button of the electric caulking gun. When the button is free, the clutch is idle so that power cannot be transmitted from a motor to a pusher. Therefore, the pusher is idle, i.e., it cannot extrude water proofing material from a package. When the button is pressed, the clutch is active so that power can be transmitted from the motor to the pusher. Therefore, the pusher is active, i.e., it extrudes the water proofing material from the package.

Abstract: A device for detecting methanol concentration in an alcohol-containing solution is disclosed. The device implements an electrochemical bio-detector based on a two-enzyme system to quickly, easily and accurately measure methanol concentration in an alcohol-containing solution at a relatively low cost. A method for detecting methanol concentration in a sample using the same device is also disclosed.

Abstract: A foldable cradle frame including a front foot, a rear foot, and an upper rod that are interconnected by common connecting bodies. The rear foot and the upper rod are pivotally connected to the connecting members and are rotatable through respective openings in the connecting members toward the front foot. Accordingly, the entire structure may be folded to provide a relatively compact structure. The rear foot is compressible along its axial length via an intermediate spring, to contribute to a rocking motion of the cradle. In addition, the cradle frame includes a U-shaped tubular member pivotally coupled to the front foot for receiving a portion of a cradle seat that is adapted to be fitted therewith.

Abstract: A foldable rail assembly includes a first shell including a first wall defining a cutout and two apertures, a second wall defining two apertures and a top formed between the first and second walls. A second shell includes a first wall defining two apertures and a passage, a second wall defining two apertures and a top formed between the first and second walls thereof. A lock defines two apertures and includes an upper portion and a lower portion of a greater length thus defining two shoulders. Two pins are inserted through the apertures defined in the first and second shells and the lock. Three springs are compressed between the lock and the second wall of the second shell. Two rails are pivotally linked to the first shell and each include an end with a block raised therefrom. The blocks are supported by the shoulders when the lock is against the first wall of the second shell.

Abstract: A foldable chair includes a seat, a back, two front legs and two rear legs. The seat is pivotally engaged to the front legs and the two rear legs are engaged to the seat such that the seat and the rear legs connected thereto can be rotated according to a pivotal feature thereof. A U-shaped frame is pivotally engaged to a grounded end of each front leg and the rear legs are engaged to the U-shaped frame. A dining board is separably engaged to both sides of the back.

Abstract: A playpen floor structure includes a joint, a plurality of tubes pivotably linked to the joint and a device for retaining the playpen floor structure in an extended position. The device includes a housing rotatably mounted on the joint between a first position and a second position, two blades projecting radially from the housing in opposite directions. Each of the blades includes a free end portion projecting downwardly therefrom. The free end portion of each of the blades is formed as a hook. Two of the tubes are engageable with the hooks in the first position. The two of the tubes are disengageable from the hooks in the second position. A cylinder projects downwardly from the housing. A helical spring is mounted on the cylinder. The helical spring includes a first tip secured to the housing and a second tip secured to the joint so that the housing is retainable in the first position by the spring. A recess is defined in the housing, and a recess is defined in an ear projecting upwardly from the joint.

Abstract: A go-cart includes a base, a plurality of wheels attached to the base and a restrainer operatively linked thereto the base for restraining the go-cart, wherein the restrainer includes two stands each including a shaft pivotably linked to the base of the go-cart and two feet projecting from the shaft. The feet are pivotable between a horizontal position for engaging the wheels with the ground and a vertical position for disengaging the wheels from the ground. The restrainer includes a device for retaining the feet in either of the vertical position or the horizontal position.

Abstract: A chair including a seat and a back, the back including a pair of parallel guide plates protruding from a rear surface thereof, each guide plate having a longitudinal groove. The seat and back are supported by first and second front legs and first and second rear legs, and a transverse part extends between the first and second front legs. The transverse part includes a top head portion including two guide tips respectively slidably received in the longitudinal grooves of the guide plates. Additionally, a height adjusting device is provided, including at least one casing slidably mounted on the first front leg, the casing including an operating element having a protrusion adapted to engage recesses formed in the first front leg of the chair.