Abstract: An angle divider includes a body portion with a proximate end and a distal end. A distal end pivot point is positioned in the distal end of the body portion. First and second removable arm are pivotally mounted to the distal end pivot point. The arms pivot with respect to the distal end pivot point. An adjustable pivot is mounted for sliding movement within an elongated slot formed in the body portion. Brackets removably interconnect the arms to the adjustable pivot. Movement of the arms results in movement of the adjustable pivot longitudinally along the body portion. A lock locks the adjustable pivot with respect to the body portion, which locks the arms in place with respect to the body portion. The removable arms can be removed from the adjustable pivot point for transport and to split the angle.

Abstract: An angle divider includes a body portion with a proximate end and a distal end. A distal end pivot point is positioned in the distal end of the body portion. A fixed arm and a removable arm are pivotally mounted to the distal end pivot point. The arms and pivot with respect to the distal end pivot point. An adjustable pivot is mounted for sliding movement within an elongated slot formed in the body portion. Brackets interconnect the arms to the adjustable pivot. Movement of the arms results in movement of the adjustable pivot longitudinally along the body portion. A lock 26 locks the adjustable pivot with respect to the body portion, which locks the arms in place with respect to the body portion. The removable arm can be removed from the distal end pivot point and the adjustable pivot point to split the angle.

Abstract: An angle measuring gauge incorporates four arms pivotally connected to form a quadrilateral. The arms are connected to a guide bar that attaches to the quadrilateral along a diagonal and forms an axis of symmetry. A first corner of the quadrilateral is pivotally attached to the guide bar and the opposite corner of the quadrilateral is pivotally connected and is slidable along the guide bar to adjust the angles of the quadrilateral. In practice, the first corner of the quadrilateral is adjusted to conform to a desired angle, and the guide bar bisects the angle formed by the first corner and can be used to either ride in a miter slot of a cutting tool, or adjust a miter gauge of a cutting tool to cut accurate miters.

Abstract: The invention relates to a head support (10, 100) for operating tables, comprising a rotatably mounted first holding element (12) for surrounding a first side of a patient's head receivable in a receiving area (32) and an also rotatably mounted second holding element (14) for surrounding a second side of the head. The two holding elements (12, 14) are coupled to each other in a coupling area by means of a coupling element (16) such that when one of the holding elements (12, 14) is rotated, the coupling element (16) also rotates the other holding element (12, 14). Between the coupling area and the receiving area (32) a stationarily arranged supporting element (33) for supporting the head receivable in the receiving area (32) is provided.

Abstract: A tool and method for making precision cuts with conventional saws and other woodworking machines. The shape of an inside or outside corner of a construction, such as a wall construction, is obtained with the tool, and the tool is used to as a guide to set the blade of the cutting apparatus to the proper cutting position. The tool may be used to indicate the miter cuts for both inside and outside wall corners without having to measure the angle with a measuring tool and determine the precise degrees of the angles to be cut.

Abstract: A tool and method for making precision cuts with conventional saws and other woodworking machines. The shape of an inside or outside corner of a construction, such as a wall construction, is obtained with the tool, and the tool is used to as a guide to set the blade of the cutting apparatus to the proper cutting position. The tool may be used to indicate the mitre cuts for both inside and outside wall corners without having to measure the angle with a measuring tool and determine the precise degrees of the angles to be cut.

Abstract: A tool and method for making precision cuts with conventional saws and other woodworking machines. The shape of an inside or outside corner of a construction, such as a wall construction, is obtained with the tool, and the tool is used to as a guide to set the blade of the cutting apparatus to the proper cutting position. The tool may be used to indicate the mitre cuts for both inside and outside wall corners without having to measure the angle with a measuring tool and determine the precise degrees of the angles to be cut.

Abstract: An apparatus for determining the angle between two adjacent objects such as the corner of a wall or the pitch of a roof, and the appropriate angle of a corresponding miter cut. The apparatus includes a base member that is configured in a substantially planar manner. The base member includes a channel for slidably receiving the ends of two support members. The support members are pivotally mounted to opposing angle arms that extend laterally in opposing directions from the base member and function to movably connect the angle arms to the base member and form a pointer thereon. The base member further includes numeric indicia that indicate the angle of the angle arms and the corresponding miter angle cut adjacent to the channel on the base member.

Abstract: An adjustable device to locate and transfer the positions of golden section points from a source image to a secondary surface, comprising a plurality of paired blades that are coupled to pivot at the golden section points that occur along the length of the blades and at the endpoints of the blades. This configuration creates a looped series of connected levers, sequenced to diminish in length by golden section ratio, with fulcrums positioned at golden section points. The device is bilaterally symmetrical and maintains consistent golden section proportions regardless of the size to which it is adjusted. The creation of accurate images by a means other than tracing enables the user to learn how the mathematics of the golden section relates to the principles of proportion that connect the parts to the whole.

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 system for modeling a recessed or protruding angle formed by convergent surfaces and transferring that modeled angle directly to a miter saw for facilitating the cutting of workpieces in conformance with the bisection of that modeled angle. This system may be manufactured with, or retrofitted onto a standard miter saw or used with a hand miter saw designed to accommodate the system.

Abstract: A system for modeling a recessed or protruding angle formed by convergent surfaces and transferring that modeled angle directly to a miter saw for facilitating the cutting of workpieces in conformance with the bisection of that modeled angle. This system may be manufactured with, or retrofitted onto a standard miter saw or used with a hand miter saw designed to accommodate the system.

Abstract: An adjustable carpenter's square for the quick and reproducible measurement of angles and radii. The adjustable carpenter's square includes a center bar that includes a set of indicia. The indicia are any appropriate set of graduations, which may include numerical notations. A indicator slide is receivable onto the center bar. The indicator slide includes a first and second slide strut pivot. A first and second strut attach to the indicator slide. A first wing attaches to the center bar and the first strut. The first wing also includes a first wing strut pivot. The first wing strut pivot hingably connects the first wing to the first strut. The first wing strut pivot attaches to the first strut. A second wing attaches to the center bar and the second strut. The second wing includes a second wing strut pivot. The second wing strut pivot hingably connects the second wing to the second strut. The first and second wings pivotably connect to the center bar.

Abstract: A gauge device and the associated method of using the gauge device to set the cut angles of a carpenter's mitering tools. The device includes a handle that has a longitudinal axis. A first arm is pivotably connected to the handle. The first arm has at least one straight edge. The straight edge of the first arm creates a first angle relative the longitudinal axis of the handle. A second arm is also pivotably connected to the handle. The second arm has a straight edge that creates a second angle relative the longitudinal axis of the handle. A spanning mechanism is provided that selectively maintains symmetry between the first angle of the first arm and the second angle of the second arm. The second arm is selectively detachable from the spanning mechanism and is movable to a retracted position. The second arm is retracted when the gauge device is used to set the cutting angle on a mitering tool.

Abstract: An improved measuring instrument for use with drawings employing different scales with indicia thereon; wherein, the measuring instrument includes a pair of elongated first and second instrument member arms having top walls and bottom walls and having opposite ends wherein one pair of ends are adapted to be releasably and pivotally connected to one another. The measuring instrument further includes a rotatble ratchet connection assembly associated with the first and second instrument member arms for captively but releasably engaging the first and second instrument member arms in both an L and an inverted L configuration. The tops walls of the first and second instrument member arms having beveled edges with indicia thereon, for preventing the indicia from engaging the measured or drawn surfaces when in use; and the bottom walls of the first and second instrument member arms having inclined planes with indicia thereon for preventing the indicia from engaging the measured or drawn surfaces when in use.

Abstract: An artwork mat marking and cutting apparatus for use in cutting mat and similar material for picture framing and the like is disclosed. The apparatus includes a combined marking and bevel cutting device and a dual scale conversion ruler for ease of measurement in laying out mat borders. The conversion ruler has a cooperating extension which fits within a grooved guide, the guide having a T square like end for squaring the mat material with the apparatus. The outer borders of the mat material may be cut using a straight cutting device in combination with the above guide. The guide includes a feature allowing the cutter to traverse the entire sheet of material. Both the bevel and straight cutting devices allow the blade to be retracted when not cutting, and have various adjustment and other features. An alternative adaptor provides for the use of the bevel cutting device to make cuts perpendicular to the mat material surface.

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: An angle determinator comprises four hingedly interconnected links. These links form jointly a parallelogram having its apexes constructed as pivot joints. At one of the apexes of the parallelogram the links are rotatably connected to a bar which is provided with a scale. Along this scale that apex of the parallelogram which is opposite to said one apex is displaceable together with a pointer cooperating with said scale. To make possible quick and handy determination not only of such "concave" or "open" angles as are defined by two planes, e.g. a floor and a wall or a wall and a ceiling, but also of "convex" or "solid" angles, i.e.

Abstract: A device useful for setting up a baseball diamond which comprises a central prong and two secondary prongs, which are positioned in such a manner so as to facilitate the positioning of first, second, and third bases as well as the pitcher's rubber on a baseball diamond.