A barrel is fixed in a barrel-carrying member and provided on its outside peripheral surface with a piston and formed with transverse bore means, which communicate with the inside of the barrel and open on the outside peripheral surface thereof forwardly of said piston. An action slide comprises a cylinder, which is spaced around said barrel and defines therewith an annular chamber, which is sealed by said piston and is defined by flow-obstructing means spaced from said piston beyond said transv...

A small switch comprising a plurality of switching elements with a hole which are oscillatably disposed one in each switch body and a single switching rod inserted through the holes of the switching elements whereby the contacts in a plurality of small switches can be made or broken simultaneously by operating the switching rod from the outside of the electronic device containing the switches. This small switch has projections and recesses on both sides of the switch body where the holes are for...

A small watercraft having a float on either side of its hull pivotally connected thereto for rotation about a shaft mounted parallel to the direction of movement of the watercraft between a horizontal operative position and a vertical inoperative position taken when the watercraft is stowed away. The floats can be locked in these two positions and in any position as desired between these two positions. Each float is substantially triangular in planar configuration and diverges in going toward th...

A two section structure adapted to be selectively converted into a single hull six passenger boat, a double hull six passenger boat and an enclosable container which may be opened from one end or from either side. The two, generally similar, forward and rear small boat sections are adapted to be hingedly interconnected along mating end walls or, mating side walls, such that, the two sections may be selectively pivoted from a fore and aft alignment to a side by side alignment to form a wide beam ...

A small watercraft including a hull of longitudinally elongated shape having a deck in its upper part, and an engine for thrusting the watercraft forwardly. The hull is formed in the forward and rearward portions of its lower part with water accommodation compartments formed with a plurality of openings for water to flow therethrough into and out of the compartments. When the watercraft is at rest, water flows into the water accommodation compartments through the openings to stabilize the hull. ...

A small printer using character wheels is provided. The printer includes a plurality of character wheels frictionally mounted on a shaft for rotation therewith and having a ratchet wheel on side surface. Associated with each character wheel is a pivotable selector pawl actuatable by an electromagnet. The number of electromagnets is less than the number of selector pawls and character wheels. Stopper cams are actuatable into locking engagement with the ratchet wheels on even-numbered character wh...

A small printer for printing characters on a printing medium especially adapted for use in a portable electronic calculator. The printer includes a frame having a carriage slidably mounted thereon for lateral displacement across the printing medium. An ink jet printing mechanism is carried on the carriage for selectively printing characters at predetermined positions along lines of the printing medium. A crank mechanism couples a motor to the carriage so that the printing mechanism can be transl...

A printer of small overall size includes a plurality of typing wheels on the periphery of which are provided letters characters or symbols. At a printing position, a selection mechanism selects one of the plurality of letters, characters or symbols on each typing wheel. A printing mechanism prints the letter, character or symbols selected by the selection mechanism by applying a pressure thereto. A mechanism for feeding recording paper is arranged after the printing device in the feeding directi...

A barrel is fixedly inserted in and protrudes from a grip and comprises a barrel chamber. A piston is provided on the outside of said barrel and rigid therewith. A breechblock comprises a cylinder surrounding said barrel and piston before said grip and defining with said barrel an annular chamber, which is sealed against said barrel. Said breechblock is movable along said barrel to and from a forward position. A counterrecoil spring urges said breechblock to said forward position. A piston is di...

A small generator comprising a stator having slots on the inner circumferential surface thereof and generating windings wound on the slots, and a salient-pole type rotor freely rotating inside the stator, in which the stator has a plurality of recesses whose width is essentially the same as the width of openings of the slots and whose area is smaller than the area of the slots, provided at the same intervals as the circumferential intervals of the slots in the vicinity of the opening of the slot...