Abstract: A combinational template and scale ruler to accurately draw three-dimensional (3D) drawing is disclosed. The scale ruler is a transparent plate, which includes a plurality of apertures disposed at a middle portion. Each aperture defines a substantially continuous linear aperture corresponding to a visible edge of 3D shape. A plurality of indicium is juxtaposed around each aperture to facilitate drawing of the 3D shape. The plurality of indicium is inscribed in surface of the scale ruler. The plurality of indicium is graduated to define angle and size factor of the aperture to facilitate drawing of the 3D shape. The plurality of indicium further includes 3D shape of a cube of the aperture. The plurality of indicium includes information regarding the classification of the 3D shape. The plurality of apertures is arranged in groups and subgroups of the groups based on a type of projection of the 3D shape.

Abstract: A power cutting tool for automatically cutting out a vent opening in a substrate such as a floor and the like according to a prescribed pattern is disclosed. The power cutting tool includes a base assembly adapted for support on a surface of said substrate. A track assembly having a track is carried by the base assembly for automatically guiding the movement of the cutting tool. A power cutting tool includes a cutting blade which penetrates the substrate to cut out the vent opening. A drive assembly includes a first drive for operating the cutting blade, and a second drive engaging the track for automatically moving the power cutting tool along the track while simultaneously operating the cutting blade to cut out the vent opening pattern in the substrate.

Abstract: A T-square for measuring and marking a panel comprises a housing; a rule mounted to the housing and arranged to engage a flat surface of a panel; a blade guide for receiving a blade, the blade guide mounted on the rule; and two moveable arms coupled to the housing and arranged to engage an edge of the panel.

Abstract: The T-plotter is a T-shaped transparent plotting utensil consisting of two mutually perpendicular arms and equipped with a rotatable compass rose mounted on a shuttle sliding along its arm of symmetry. This device allows a simplified plotting of celestial lines of position according to the intercept method of Marcq St. Hilaire. The compass rose is used to dial in the required azimuth. The intercept distance is marked by sliding the shuttle to the appropriate distance from the top of the main body based on the latitude scale of the employed nautical chart.

Abstract: The present invention relates to a device for easily and accurately marking, scoring and cutting drywall sheet material, the device having a general appearance of a T-square and comprising gripping pins for securely holding the T-square on the sheet material to be marked, scored or cut.

Abstract: It is extremely important that wall board form a tight seal between the top of wall board and when fluted deck is the roof that meets the wall board. The present invention relates to a template useful for preparing wall board or related building material to match the fluting pattern of fluted deck panels to form a seal between the decking panels and walls of a building.

Abstract: The drafting apparatus has only three parts which are the permanently attached first head and blade, the adjustably attached second head, and the thumb screw. The apparatus quickly adjusts to a given surface. If secure attachment is desired, the thumb screw is tightened against the blade to position the second head firmly against a side of the surface opposite the first head. If desired, the second head is easily completely removed, to aid a draftsperson in a given task. The apparatus is not confined to use only on a drafting table. The transparent bevels provide visual access to indicia under part of the blade. The relatively long length of the elongated slot provides for fit to even narrow drawing surfaces.

Abstract: It is extremely important that wall board form a tight seal between the top of wall board and when fluted deck is the roof that meets the wall board. The present invention relates to a template useful for preparing wall board or related building material to match the fluting pattern of fluted deck panels to form a seal between the decking panels and walls of a building.

Abstract: A finger guard for use with a T-square having a head and a blade includes an elongated body, two finger-shielding surfaces extending along a longitudinal axis of said body for accommodating an installer's thumb, a lower edge on the body that is attachable to the blade of the T-square, and a peak edge opposite the lower edge and separating upper ends of the surfaces.

Abstract: A finger guard for use with a T-square having a head and a blade includes an elongated body, two finger-shielding surfaces extending along a longitudinal axis of said body for accommodating an installer's thumb, a lower edge on the body that is attachable to the blade of the T-square, and a peak edge opposite the lower edge and separating upper ends of the surfaces.

Abstract: The present invention relates to a device for easily and accurately scoring and cutting drywall sheet material, the device having a general appearance of a T-square and comprising rollers under the portion of the device that contacts the edge of the drywall sheet, a movable blade and blade holder and other features to aid the user in scoring and cutting drywall.

Abstract: The apparatus includes a first plate for supporting the first surface of the article adjacent to the edge part of the article, a second plate extending from one end of the first plate in order to support the second surface of the article adjacent to the edge part of the article, a band connected to both side ends of the first plate such that a worker is able to securely hold the apparatus using one hand, and a non-skid member attached to at least one of inner surfaces of the first and second plates, which make contact with the first and second surfaces of the article, so as to prevent the apparatus from sliding along the article.

Abstract: The telescoping T-square has a crossbar or cross-member and an extendable shaft or leg. The cross-member is a relatively short bar having a pair of parallel runners longitudinally extending across the length of one surface of the bar and a slot defined through the bar between the runners that extends from the center of the bar laterally towards one of the ends of the bar. The leg has a tubular, hollow proximal rod removably attached to the cross-member, and at least one telescoping distal rod slidably disposed in the proximal rod, with detent buttons locking the rods together at selected intervals. One end of the proximal rod has transverse grooves or channels defined therein slidably receiving the runners and a threaded stud extending therefrom that is slidable in the slot defined in the cross-member. A knob engages the stud to temporarily lock the cross-member and leg in fixed relation.

Abstract: An apparatus for marking and scoring a work object has a first member having a first and second side. A flange is connected to a second side of the first member. A second member has a first edge and a second edge. The second member is connected to extend perpendicularly from the first member. The first edge has a plurality of crenulations extending therealong for receiving an instrument. The flange of the first member is positioned against an edge of a work object and the instrument is positioned between adjacent ones of the plurality of crenulations and against the work object. When the first member is moved along the edge of the work object, the instrument is caused to mark or score the work object along a line parallel to the work object.

Abstract: A portable saw guide and T-square and method of use where an accurate and straight saw cut is desirable. The T-square saw guide has an alignment arm and a flexible guide arm which can be quickly and accurately secured to a work piece such as a sheet of plywood by a clamping mechanism in order that a worker may use a guide edge of the T-square to accurately maneuver and guide a saw along a desired course despite variations in the surface of the work piece. The guide arm forms a flush linear contact between a surface of the workpiece and the saw guide to compensate for any non planar irregularities such as a bow, sag or warp in the work piece to cause continuous contact between the saw being guided along the guide edge of the T-square to produce a straight cut along the work piece.

Abstract: A drywall marking and scoring guide tool having a generally T shape that includes a U-shaped top channel to slidably engage the edge of a drywall sheet, the top channel having a perpendicular stem extending from the channel and incorporating a plurality of guide apertures incrementally spaced along the stem's length. The guide apertures to receive a marking or scoring device so as the guide is drawn down the length of a drywall sheet the surface of the sheet is scored or marked.

Abstract: An apparatus for marking and scoring sheet material having a side edge includes a base having an upper surface and a contact edge adapted to engage a side edge of the sheet material. A trans-base is secured perpendicularly to the base and is adapted to rest on the upper surface of the sheet material. The base and the trans-base are susceptible to rocking movement about a fulcrum defined by the trans-base as the contact edge of the base is drawn along the side edge of the sheet material. Stabilizing wing structure on the base is constructed and arranged to prevent any such rocking movement of the base and the trans-base as the contact edge is drawn along the side edge of the sheet material. The stabilizing wing structure includes an upturned side edge maintained out of engagement with the sheet material upper surface, to prevent the wing structure from engaging irregularities in the sheet material upper surface as the base contact edge is drawn along the sheet material side edge.

Abstract: A combination level and T-square comprising an elongate level sensing section and an elongate T-bar section which can be alternately removed from or rigidly connected to the level sensing section in three locations to form three different configurations, a T-shape, a left-hand L-shape and a right-hand L-shape. The invention has two engagement hand screws; one for securing a sliding tongue into the level sensing section and the other for securing the T-bar to the tongue in one of the three desired configurations. The T-bar may be positioned further or closer to the level sensing section by sliding the tongue telescopically within the level sensing section.

Abstract: An improved electronic combination square (10) comprising an elongate blade (12) constructed of a nonmagnetic material. An elongate conductor strip (14) constructed of a magnetic material is connected longitudinally into a recessed top surface of the blade (12). A head (16) is provided having two ninety degree angle sides (18), (20) and two forty five degree angle sides (22), (24) constructed of a non-magnetic material. A facility (26) is for allowing the head (16) to slide to any position along the blades (12) over the conductor strip (14) from either of the two ninety degree angle sides (18), (20). A structure (28) is for locking the head (16) to the blade (12) from either of the two ninety degree angle sides (18), (20). A component (30) in the head (16) is for actuating a signal magnetically, relative to the position of the head (16) on the conductor strip (14) in the blade (12).

Abstract: A mat board cutting guide for use in cutting mat board for flamed pictures, for example, is disclosed. The cutting guide includes an elongated straight edge having a top and a bottom surface, a first and a second end, and a first and a second edge. The first and the second edge are parallel to each other and extending along the entire length of the straight edge. The cutting guide also includes a squaring head having a thickness substantially equal to the thickness of a standard single mat board, approximately 1/16 of an inch. The squaring edge is attached to the bottom surface of the straight edge at the first end of the straight edge. The squaring head includes a squaring edge adapted to engage a first edge of a piece of mat board when the bottom surface of the straight edge is placed on the piece of mat board. The squaring head is attached to the straight edge such that the squaring edge of the squaring head is perpendicular to the first and second edge of the straight edge.

Abstract: A multi-purpose combination tool for forming an enlarged T-square or, alternately, an elongated carpenter's level to facilitate installation of wall panels, doors, windows, signs and the like. The tool comprises an arm and a cross member rigidly mountable perpendicularly thereon. The arm and the cross member each have a central web portion with parallel flanges at opposite end edges of the web portion and spaced apart level vials secured within cutouts formed in each of the respective web portions. Ruler scales are situated along the end edges so that when the arm is rigidly mounted perpendicularly to the cross member, the scales share a common point of origin. In addition, the cross member, when so attached to the arm, forms a shoulder projecting outwardly therefrom against which the straight edge of a workpiece can be abutted while the arm itself is used as a guide for marking or cutting.

Abstract: An attachment for a carpenter's level to create a T-square comprises an integrally molded head member having a rectangular socket formed therein and extending perpendicular to reference edges defined by opposed parallel spaced-apart side walls. By inserting one end of a spirit level into the socket and by tightening down a set screw, the head member is releasibly attached to the carpenter's level and with the longitudinal axis of that level intersecting the bottom edges of the head member at an angle of 90.degree..

Abstract: A guide for a hand-manipulated power saw having a main support plate, the guide having a sole plate with a saw-guiding edge, and a gauge bar clamp on the sole plate at the bottom surface thereof at right angles to the guiding edge, the clamp having a resilient member spaced from the bottom surface of the sole piece to hold a gauge bar or rod directly against the work-piece.The invention includes two forms, one in which the clamp is integral with the sole plate and thus fixed in relation to the saw guiding edge, and a form in which the clamp is detachable and adjustable relative to the saw guiding edge, the clamp in this case being under the sole plate so that the gauge bar is also located under the sole plate in use.

Abstract: A square device for use by steel fabricators including a blade member and a beam member attached adjacent one end of the blade member whereby the adjacent inner surfaces of the blade member and beam member are at right angles to each other, and an elongated notch defined by the inner surface of the beam member extending from one end of the inner surface of the beam member to the other end of the beam member and which is of sufficient width whereby a portion of the notch extends above and below the blade member. In a preferred embodiment, the inner corner of the beam member is provided with a vertical groove.

Abstract: The present invention relates to an improved construction square which is both durable, simple to manufacture and use, and inexpensive, and that provides the ability to quickly tighten diverse blade configurations into proper position for use.

Abstract: A pregauging tool for the stop assembly of a cutting device wherein the pregauging tool has a scale having an elongated configuration and opposed substantially parallel longitudinal edges. At least one series of graduations extends longitudinally along the scale and a flange member is mounted at the end of the scale associated with the zero index of the graduations. The flange member has a linear first side adapted for securement along a cutting plane of the cutting device. An indicator member is slideably fit to the scale and has a cantilevered abutment arm extending in a transverse direction relative to the longitudinal dimension of the scale. The abutment arm has a lead end defining a registration plane for reading of the scale graduations, and has a trail end spaced apart from the lead end by a distance equivalent to the portion of the graduations covered by the flange member.

Abstract: A drawing board and drawing instrument combination is provided. The drawing board has grooves along three of its edges and at 45.degree. across the corners which can receive tongues provided on either side of a flat drawing instrument. The instrument has a number of straight edges which overlie the board in use and which make different angles to the edge of the board. The instrument serves as a T-square and also as a set-square, and is reversible.

Abstract: The disclosed guide, or square, has an elongated planar body, and a planar cross bar angled normal off one end edge of the elongated body, somewhat in the configuration of a "T". One end of the cross bar projects away from the elongated body only a short distance, of the order of 1/4 to 5/8 of an inch; while the other end of the cross bar projects a much greater distance from the elongated body, of the order of 11/8 to 11/4 of an inch, to correspond generally in length to the width of the narrow side of a standard framing member or stud. Correspoding side edges of the elongated body and cross member lie in a common plane disposed normal to the corner intersection between the elongated member and cross bar. With the elongated body positioned against the wide side of the stud, and the extended cross bar end squared against one narrow side of the stud, the cross bar end projects virtually across the one narrow side of the stud.

Abstract: A drawing aid for assisting in the marking of lines or other markings on sheet material incorporates a blade-like portion (2) which is connected with a location region (1A, 2A) which includes means (4, 5) deformable relative to the blade-like portion to be able to provide abutment surfaces which enable the aid to so co-operate with the actual edge of a sheet (8) of flexible or non-rigid material such as a sheet of paper as to use the edge (11) as the guide for the aid during the positional adjustment thereof to the location at which it is desired to draw lines or the like on the sheet (8). When the aid is engaged with a sheet edge (11) a part (1A, 2A) of the aid (1) presses on the sheet marginal edge (11A) to remove any buckles etc. and also to prevent any relative displacement of aid and sheet.

Abstract: A pair of simple rules, each having a body portion identical with a standard rule and a head at one end cooperating with the other rule, for placing the two rules in an arrangement forming a T-square, and enabling one to be moved or slid along the other. A modified form includes means for releasably binding the two rules together in set position.

Abstract: A wave-form carpet layer's template used for cutting the edges of pieces of carpeting in matching wave-form patterns preliminary to sewing the side edges together in a substantially invisible seam. The template comprises a flat, rigid strip of structural material having two legs arranged substantially at right angles to each other. The inner and outer side edges of both legs have uniform wave-form contour, the crests of the inner side edges being opposite the valleys of the outer side edges. The width of each leg is substantially equal to one-half the wave length of the wave-form contour. The apex of the two meeting outside edges is located in the crest portion of one of the side edges and the valley portion of the other of the side edges.

Abstract: This invention provides a quick and accurate gauging means for locating and clamping a guide onto the top surface and leading edge of a workpiece, with respect to the line of cut desired. During execution of the cut, the gauging member of the guide is automatically returned to its storage position and cocked for the next cut. This guide is completely operable with only one hand, leaving the other hand simultaneously free for holding and operating the portable hand power saw. This invention yields cuts that are accurate and more quickly executed than freehand cuts or cuts where other types of saw guides are employed.

Abstract: The tool incorporates a housing for opposed tape and chalkline reels. The housing has sufficient height to act as, and in conjunction with, an attached abutment, to make the tool useable as a cutting guide square. The abutment surface has the triple function of aligning the device square to the edge of a piece of lumber edge while providing mounting bosses for a scribe element, and, with the scribe element, acting as a hanger for removably attaching the device to the user's belt.

Abstract: A guide for portable power driven cutting tools comprising a guide member having a surface for placement on a workpiece and a tool guiding edge, and a gauge bar carried by the guide member for positioning the guide member on the workpiece in spaced relation to the line of cut. The guide is provided with at least one finger engageable formation on the guide member for maintaining the guide in a fixed position relative to a workpiece while a cut is being made by the power tool.

Abstract: A large T-square having retractable pins for temporary attachment of the T-square to the face of a product such as a gypsum wallboard.