Abstract: A keyboard includes a keyboard body similar to a traditional keyboard. The keyboard body has an edge from which an additional portion extends. The portion has a top face on which an EL panel or a thin plate having patterns and/or figures printed thereon is placed. A transparent cover is openably attached to the portion for covering the top face and thus housing the EL panel or the thin plate. The cover may be hinged to the portion whereby it is movable between a closed position and an open position. Alternatively, the cover is releasably attached to the portion whereby the cover can be removed for replacing a new EL panel or a new thin plate having different patterns printed thereon. The EL panel or the printed thin plate serves the purpose of decoration and enhances the appeal of the keyboard to the general consumers.

Abstract: A structure for fixing a mouse pad in a notebook computer includes a resilient post extending from a bottom of the mouse pad. The post extends through a hole defined a circuit board contained in the notebook computer. The post has a free end abutting a portion of the notebook computer. The free end is expanded and defines a circumferential shoulder engaging with an underside of the circuit board thereby securely fixing the mouse pad in the computer while allowing readily mounting/dismounting of the mouse pad to/from the computer.

Abstract: An offset pen including a holding portion, a writing portion, and an intermediate portion connected between the holding portion and the writing portion to make the holding portion and the writing portion positioned in different axes is disclosed. The writing portion is separable from the holding portion, for example by dividing the intermediate portion into two engageable parts or by detaching the writing portion from the intermediate portion, in order to facilitate the production of the crooked offset pen and/or the installation of a writing material.

Abstract: An automatic writing apparatus includes a plurality of writing elements axially positioned one by one, each of which has a tip portion at the front end and an element cap having a hole for receiving therein the tip portion of an adjacent one of the writing elements; an outer tube for receiving therein a first and a second ones of the writing elements, wherein the outer tube includes a pen-tip outlet for holding the first one of the writing elements; and an inner tube for receiving therein the others of the writing elements and propelling the second one of the writing elements toward the pen-tip outlet for replacing the first one of the writing elements.

Abstract: A band-type warning device includes a buckle body, and a light-transmissive strap member with a connecting end connected to one lateral wall of the buckle body. A detachable engaging member includes jaws disposed on the other lateral wall of the buckle body, and an enlarged head portion formed on a detachable end of the strap member. A guiding cleft and a retaining groove are defined by the jaws and the lateral wall such that the head portion can be forced and retained into the retaining groove from the guiding cleft, thereby engaging the detachable end and the buckle body. A lighting element is disposed on at least one of the lateral walls to illuminate the strap member.

Abstract: A synchronous tracking filter circuit for use in a broadcast satellite tuner that comprises four varactors and a strip-shaped inductor plate or pcb-printed strip line which produces a resonant frequency. The circuit is used in a doubly tuned resonant circuit to incorporate the tracking with the frequency changes of a voltage controlled oscillator (VCO) synchronously. The circuit can also control the image interference. This type of design is applicable in the tuner of an indoor broadcast satellite receiver unit to act as the synchronous tracking filter of input frequencies.

Abstract: The present rolling ruler includes a ruler body having a through hole, a shall having two ends and sleeving thereon the ruler body, and two rollers respectively mounted on the two ends for translating the ruler body. One characteristic of present invention is that different scales are provided on edges of a ruler body.

Abstract: A rolling rule that is effective and/or diversified and/or capable of being easily positioned at a desired position and/or capable of being or easily manipulated/controlled is provided. The rolling rule includes a role body, a roller rotatably mounted in the rule body for enabling the rule body to be translated easily in a parallel fashion, a braking device mounted on one side of the rule body, which is to be exerted by a force generally along a direction parallel to a surface of a work piece for permitting the braking device to easily and conveniently brake the roller when a braking occasion is desired, and an outer surface layer having a relatively high frictional coefficient and surrounding the roller for enabling the roller to be positively controlled in motion or at a stop.

Abstract: A sucker being diversified and/or improved and/or more endurable and/or more effective and/or convenient and/or multi-functional and/or more efficient is provided. The sucker includes a downwardly concave sucking body to be pressed against an attaching surface to vacuumize the room defined therebetween, a downwardly concave resilient member superimprosed above the sucking body and having an outer periphery and a plurality of grooves not beginning from the periphery, and a connector connecting together the sucking body and the resilient member in the manner that after the sucking body has been pressed against the attaching surface, the resilient member will tend to urge the sucking body away from the attaching surface which will in turn result in that the sucking body is more securely attached to the attaching surface.

Abstract: A sucker being diversified and/or improved and/or more endurable and/or more effective and/or convenient and/or multi-functional and/or more efficient is provided. The sucker includes a downwardly concave sucking body to be pressed against an attaching surface to vacuumize the room defined therebetween, a downwardly concave resilient member superimposed above the sucking body and having a periphery and a plurality of grooves, and a connector connecting together the sucking body and the resilient member in the manner that after the sucking body has been pressed against the attaching surface, the resilient member will tend to urge the sucking body away from the attaching surface which will in turn result in that the sucking body is more securely attached to the attaching surface.

Abstract: The suction device includes a chamber having a closed end, an open end and an annular fringe connecting the closed end and the open end. The closed end has a securing device centrally extended into the chamber and two parallel bracket supports being formed on the closed end. A slot is formed between each of the bracket support and the closed end. A suction cup has a holding device at the top portion thereof and is connected to the securing device of the chamber by a screw joint, in which condition the annular fringe of the chamber presses tightly against the suction cup.

Abstract: The invention provides a multi-purpose safety device which can be used in conventional nailing operations to guide the nail to be driven safely, conveniently and quickly at a desired angle and which can be used for measuring angles and inclinations as well as levelling. The invention includes a driving member disposed in a sleeve which in turn mounted on an upper side of a housing, a nail advancing plate at one side of the housing for advancing nails, and a nail guiding body below the sleeve for guiding and positioning a nail beneath the driving member whereby the nail can be driven into an object by the driving member. An angle meter is further mounted in the housing for measuring angles as well as indicating a desired angle by which the nail has to be driven.

Abstract: An angle measuring instrument comprises, a multi-sided plate member which includes a first side and a second side that form an acute angle therebetween when they intersect, a third straight side that forms with the second side an obtuse angle when they intersect, and a graduated semi-circular region. A first measuring arm is pivoted to the plate member at the center of the semi-circular region, a second measuring arm is pivoted to the plate member at a point near the acute angle outside the circular region, and a third measuring arm is pivoted to the first and second measuring arms to form a parallelogram linkage with the plate. The second, and third sides of the plate member serve as measuring sides in cooperation with the measuring arms, thereby diversifying the application of the instrument.

Abstract: A vernier gauge includes a first arc member having a first radially inner side and a first radially outer side, a second arc member having a second radially inner side and a second radially outer side slidably engaged with the first radially inner side, having a second free end and a second clamped end and provided with a second scale, a third arc member having a third radially inner side slidably engaged with the first outer side and a third radially outer side, having a third free end and a third clamped end and provided with a third scale, the third arc member together with the first and second arc members defining a free space at the center of the first, second and third arc members, two intermediates each of which has a first end provided on one of the second and third free ends and a second end and is capable of moving radially with respect to the arc members and two measuring pieces each of which has a first engaging end pivotally connected to the second end and a second engaging end pivotally intercon

Abstract: A vernier gauge has three arc members, two flat pieces and two sliding pieces. A second arc member is slidably engaging with a first arc side of a first arc member from a first end of the first arc member and a third arc member is slidably engaging with a second arc side of the first arc member from a second end of the first arc member. Each of two free ends of the second and third arc members is actively attached one of the two flat pieces each of which is slidably engaged with one of the two sliding pieces. The second, third arc members and the two flat pieces are provided with main scales and the first arc member and the two sliding pieces are provided with corresponding vernier scales. Each of the two sliding pieces is further provided with two opposite tips and a flat surface. Such gauge can permit accurately fractional readings of angles as well as inner or outer diameters of objects and of depths of objects when the flat piece is solely used.