Abstract: The line-marking tool attaches to a pad of paper. The line-marking tool comprises an anchored straight edge, a rotating straight edge, and a slewing bearing. The slewing bearing attaches the rotating straight edge to the anchored straight edge. The anchored straight edge attaches to the pad of paper such that the position of the anchored straight edge relative to the top sheet of the pad of paper is fixed. The anchored straight edge and the rotating straight edge are used to draw straight lines on the top sheet. The slewing bearing adjusts the cant of the rotating straight edge relative to the anchored straight edge such that a cant is formed between a line drawn using the rotating straight edge and a line drawn using the anchored straight edge. The slewing bearing is calibrated to form a precise angle of cant on the top sheet.

Abstract: A protractor comprising an angle scale provided with a dial gauge with a circle center, one end of the bottom edge being connected with a first side edge, and the first side edge and the bottom edge forming an included angle, and the angle of the included angle being 135 degrees; a right angle rocker arm, comprising a reading arm part and a tail arm part forming a right angle with the reading arm part, the right angle rocker arm rotating relative to the angel scale such that a first edge of the tail arm part and the bottom edge form a first change included angle, the value of the first change included angle being read by means of the reading arm part and the dial gauge; and a locking structure for rotationally connecting the angle scale and the right angle rocker arm.

Abstract: A protractor, the protractor comprising: a protractor first element and a protractor second element mountable to each other so as to be rotatable relative to each other about a rotation axis; the protractor first and second elements being mountable to each other in an unlocked configuration and in a locked configuration, wherein, in the unlocked configuration, the protractor first and second elements are removable from each other, and, in the locked configuration, the protractor first and second elements remain mounted to each other unless the unlocked configuration is achieved; wherein, in the locked configuration, the protractor first and second elements are biased towards each other to create a predetermined frictional force therebetween resisting a rotation of the protractor first and second elements relative to each other about the rotation axis.

Abstract: A device for measuring the height of persons, the device including a vertical element and a headpiece arranged on the vertical element so as to be freely positionable. The headpiece is arranged so that it is rotatable relative to the vertical element by a rotational joint. An axis of rotation of the rotational joint is arranged obliquely with respect to a longitudinal axis of the vertical element.

Abstract: A combined set of interacting instruments for constructing and analyzing mathematical figures includes a ruler, an adjustable triangle assembly, a compass and a protractor. The ruler includes an elongated strip of rigid or semi-rigid plastic having a length, width and relatively thin thickness. A pivot point is provided in a general middle portion of the ruler together with three parallel longitudinally extending guideways along portions of the ruler. One of the guideways includes a positioning hole for a writing instrument to act as a compass. The triangular assembly includes two moveable elements having first and second ends with the two elements pivotally connected together at one end of each of the elements so they can be disposed in an end to end relationship. The moveable elements also have a guide follower that fits within one of the guideways in the ruler.

Abstract: An extendable edge reference tool is disclosed. A first segment having a extending end and a receptacle end is provided. The receptacle end includes a coupling mechanism for joining a second segment using an over-center locking force to secure said second segment to said first segment. This tool provides for a useful continuous reference edge over extended distances through adjoining segments. Each segment is suitably compact to be easy stowed. The segments are useful individually. The segments can be joined to extend tool to lengths useful in common construction tasks.

Abstract: A combined set of interacting instruments for constructing and analyzing mathematical figures includes a ruler, an adjustable triangle assembly, a compass and a protractor. The ruler includes an elongated strip of rigid or semi-rigid plastic having a length, width and relatively thin thickness. A pivot point is provided in a general middle portion of the ruler together with three parallel longitudinally extending guideways along portions of the ruler. One of the guideways includes a positioning hole for a writing instrument to act as a compass. The triangular assembly includes two moveable elements having first and second ends with the two elements pivotally connected together at one end of each of the elements so they can be disposed in an end to end relationship. The moveable elements also have a guide follower that fits within one of the guideways in the ruler.

Abstract: An extendable edge reference tool is disclosed. A first segment having a extending end and a receptacle end is provided. The receptacle end includes a coupling mechanism for joining a second segment using an over-center locking force to secure said second segment to said first segment. This tool provides for a useful continuous reference edge over extended distances through adjoining segments. Each segment is suitably compact to be easy stowed. The segments are useful individually. The segments can be joined to extend tool to lengths useful in common construction tasks.

Abstract: Taught herein is a protractor capable of measuring angles within a room and angles related to the intended orientation of molding with respect to the room. Using these angles, the present invention will calculate and display the appropriate angles at which a miter saw must be set to produce mitered joints for the installation of trim and crown molding.

Abstract: A multi-purpose tool includes a graduated extension pivotably and lockably connected to a leveling extension. The graduated extension includes graduations for measuring length, angles, pitch, or a combination of these measurements. Angles may also be measured with a graduated disc. The leveling extension includes at least one bubble level for checking the horizontal or vertical orientation of the leveling extension. The leveling extension may include graduations for measuring length, angles, pitch, or a combination of these measurements. The tool may be extended such that the graduated and leveling extensions are collinear, having a total length of 16 inches end to end. A multi-purpose tool may be conveniently used to take the place of several separate tools such as a speed square, a T-bevel, and an extended torpedo level. The tool may also allow quick determination of the required distance between wall studs, rafters, and floor joists.

Abstract: An angle measurement tool having two legs held together by a removable adjustment member in which the legs are joined together about a common axis so that one of the legs rotates with respect to the other to form a desired angle the value of which is read using indexing means located on both legs.

Abstract: The invention is a snap locking angle adjustable device, particularly applicable to carpenter's squares. Carpenter's squares, being used in rough environment, must be simple to adjust while providing robust snap locking at high angle precision. Prior art attains this by protruding steel balls, attached around the pivot axis of the square's handle, pressed strongly against a hole punched area around the pivot axis of the square's blade-balls aligns to holes gives the snap locking. The problem is to simplify manufacturing. The invention comprises components with moulded alignment structures. These components are the complete pivot members (handle or blade) themselves, or are separately attached to the pivot members. The components, and optionally, are sandwiched, alignment structures against each other, and axially pressed together strongly by a spring held in compression by a press frame that also may constitute a pivot shaft for the pivot members.

Abstract: A distance measuring tool including a plurality of substantially flat unit members each having ears at opposite ends of opposing sides and measurement marks along a side extending between the opposing sides, with pivot members pivotably secured between the ears at opposite ends of opposing sides of adjacent unit members. The unit members are pivotally secured to adjacent pivot members along two spaced pivot axes, where the ears define the pivot axes a distance X from the ends of the ears and the pivot members define the pivot axes spaced apart a distance at least 2X. The unit members have a thickness Y and the pivot members have a width W, where 2X<W<2Y and, in another form, the ears are rounded to avoid interference with an adjacent ear when the unit members are pivoted relative to the pivot members. The pivot axes are defined by axially aligned pins pivotably received in recesses.

Abstract: An angle measuring tool having pivotally connected members and an angle measurement index with and off center portion positioned so that upon the rotation of one member with respect to the other the angle between the two members can be accurately determined with no possibility of slippage of the angle measurement index due to the off center portion mating with one of the members.

Abstract: A combination square comprising a blade; and a head defining a slot in which said blade is at least partially received, said blade extending generally perpendicular to said head; wherein said head is divided into a first portion and a second portion, said first portion defining said slot, wherein said first and second portions are pivotally joined to each other by a pivot assembly, said pivot assembly defining an axis that extends parallel to said blade, whereby said second portion may be rotated about said axis.

Abstract: A protractor comprising a frame and a lever arm coupled thereto. The frame includes a first substantially straight edge and an elongate track adjacent to the first edge. The lever arm includes a second substantially straight edge and a channel which mateably engages the track of the frame. The channel/track combination couples the lever arm to the frame and permits the lever arm to rotate about an axis substantially orthogonal to the first and second edges. The first and second edges intersect at a point allowing a user to describe an angle between the two edges.

Abstract: A tool for hanging fascia board includes three parts. A first part consists of a t-bar having two pieces attached perpendicularly together and designed to be removably mounted on the end of a rafter board with the flat elongated member lying against a side wall of the rafter and with a portion of the second perpendicular member overlying the top of the rafter and removably affixed to it through the use of nails driven through openings in the second perpendicular member. A support hanger is pivotably mounted to the t-bar and has a slot sized and configured to slidably receive a fascia board. A depth adjuster is mounted on the support hanger and may be reciprocated and fixed in a desired position to adjust the depth of the slot of the support hanger. Thus, the depth of the slot may be adjusted to facilitate attachment of fascia boards of varying dimensions such as, for example, 2×4, 2×6, 2×8, 2×10, and 2×12.

Abstract: A pivot shaft device installed between an object and a body for adjusting a relative angle therebetween is disclosed. The pivot shaft device comprises an axial shaft, an axial sleeve and at least one retaining element. Each retaining element has a plurality of friction arms and at least one positioning portion. The plurality of friction arms are arranged along the axial direction of the axial sleeve and are parallel to each other. The positioning portion is integrally connected to each of the ends of the friction arms. When the axial shaft inserts into the axial sleeve installed with the retaining element, as the object rotates with respect to the body, a steady torsional force is generated by the interaction of the friction arms and the first axial portion.

Abstract: A length measuring device is used for measuring a length of from a virtual intersection of the extension lines of two surfaces extending along the respective sides A1, A2 to ends of the respective sides of a bent member. The length measuring device is comprised of a rotary body 20 rotating about the virtual intersection as a center O and a scale body 30 having graduations (divisions). The rotary body 20 has a contacting side 20c with which one side of the bent member A is brought into contact, while the scale body 30 has a contacting side 30c with which the other side of the bent member A is brought into contact. The two contacting sides 20c, 30c are arranged on straight lines drawn through the virtual intersection.

Abstract: An angle measurement tool in which the assembled components result in only two moving parts that are pivoted relative to each other and wherein the pivot axis is the geographic center of the angle measurement component and wherein a miter joint angle, the correspondent actual angle, the complementary angle of the actual angle and the supplementary angle of the actual angle can be read simultaneously.

Abstract: An adjustable measuring device, including two segments pivotally joined at one end and having a measuring arc therebetween, at least one of the segments having an extending member capable of extending across the pivotal joint. The measuring arc provides the measure of angle between the two segments. Inner corners can be measured by placing the two segments against the surfaces defining the inner corner and reading the measuring arc. By extending at least one of the extending members across the pivotal joint, the angle of outer corners can also be measured in a similar manner.

Abstract: An instrument for performing various drawing and measurement functions is disclosed. The instrument includes an elongated plate having a straight edge and a measurement region. A protractor plate is connected to the elongated plate and cooperates with a rotatable center dial for the drawing and measuring of angles. The instrument also preferably includes holes through the elongated plate. The holes are configured to receive a marking instrument so the device can be used as a compass. Additionally, an attachment region allows the instrument to be held in a conventional ring binder.

Abstract: An apparatus for measuring compound angles. This apparatus makes use of the standard T-bevel square, which is capable of measuring only a single angle. The invention is a compound angle blade with a split collet joint. The compound blade attaches by replacing the bolt of the T-bevel with fastening means attached to the split collet joint of the invention. This fastening means secures both the compound angle blade and the standard T-bevel square blade. The split collet joint which is attached perpendicularly to the main body of the T-bevel moves in a 360 degree radius parallel to the main body of the T-bevel. The compound angle blade is capable of rotation in approximately a 180 degree radius relative to the split collet joint. The combination of the rotation of the split collet joint and the compound angle blade allows for compound angle measurements both perpendicular and askew relative to the angle of the standard T-bevel. The angles of both blades are fixed by the same fastening action.

Abstract: A mitering guide device for a circular saw has a protractor including a curved edge with angle markings thereon. An arm is pivotally attached to the protractor and performs in conjunction with a saw guide for defining an angle to be cut. A hinge is attached to the protractor and saw guide through multiple hinge joints for permitting various thicknesses of boards to be cut.

Abstract: A protractor comprising a generally flat protractor disc having a straight edge portion and a semi-circular portion. An arm member is pivotally secured at one end to a central section of the straight edge portion and overlies the front surface of the semi-circular portion at the other end. The arm member has a straight drawing edge that aligns with angle indicia on the semi-circular portion. An arcuate member extends outwardly from the front surface of the semi-circular portion. The arm member has recess in a rear surface thereof that receives the arcuate member therein. The relationship between the depth of the recess and the distance that the arcuate member extends from the front surface of the semi-circular portion is such that the arm member is spaced from the indicia on the front surface.

Abstract: An angle measuring instrument provides two straight arms connected at one end for relative pivotal movement. A telescoping assembly includes two elongated telescoping members each providing a free end. The free end of one telescoping member is pivotally connected to one arm and the free end of the other telescoping member is connected to the other arm. The telescoping members provide scales indicating the angular position between the two arms, the distance between the pivots of the free ends of the telescoping members on the arms, and a correction to be added to or subtracted from measurements along the length of the arms to establish distances from the corner which is being measured. The two arms can pivot through a full 360 degrees relative to each other, permitting the measurement of inside and outside corners of all sizes. A straight edge is removably mounted on one of the arms when measuring outside corners.

Abstract: The angle gauge employs pivoted, straight edge arms having indicia therealong to determine length of the arms of bent or angled material as measured from the virtual apex of the angle of bend regardless of the radius of bend. Angle indicia is also provided at the pivot for determining the angle of bend.

Abstract: A caliper for the direct reading of the size of nuts, boltheads and fittings. On each leg of the caliper is a linear scale, one scale being calibrated in metric units, and the other in English units. When the terminal tips of the caliper are brought into contact with parallel faces of a fitting, the size of the fitting is read on either scale at the point where the inner edges of the legs intersect. All points on the legs of the caliper translate along concentric arcs of circles which have a common virtual pivot point in space, remote from the upper end of the caliper.

Abstract: An angle-measuring instrument which includes two arms, which are interconnected in such a way that they can be pivoted about a common shaft, and an indicator for the angle of spread of the two arms. The shaft is rigidly connected with one of the arms, and drives the drive gear of a transmission gearing which is arranged in the at least partially hollow second arm. As a function of the angular position of the two arms relative to one another, the transmission gearing moves the indicator, which is also disposed in the hollow second arm, and in the indicating region of which a viewing window is arranged in the hollow second arm.

Abstract: An extensible rule and protractor formed by an equally dimensioned pair of superposed strap members, having indicia thereon, secured together by a screw projecting through one member and sidably received by a longitudinal slot in the other member. Guide pins, on one member entering longitudinal grooves on the other member, maintain the members in longitudinal alignment when one member is sidably moved longitudinally relative to the other. A circular groove intersecting the longitudinal grooves at one end portion slidably receive the pins permitting angular rotation of one member with respect to the other to measure and define a selected angular position.

Abstract: A pair of first and second elongated arms are provided and the arms include corresponding base and free ends. Pivot structure is provided and pivotally connects the base ends of the arms together for relative 360.degree. angular displacement and the pivot structure and second arm include coacting structure whereby the axis of relative pivoting of the first and second arms may be adjustably shifted along the second arm. Also, the first and second arms include coacting latch structure whereby the arms, in at least one predetermined position of the pivot structure along the second arm, may be releasably secured in a plurality of relatively angularly displaced positions.