Abstract: A post level including a pair of arms pivotally attached to each other at a hinge, each arm defining at least one level face for plumbing a surface, and at least one bubble vial mounted on at least one of the arms on a surface generally opposite to the at least one level face, wherein the arms may be swung about the hinge so as to be positioned generally parallel with each other with the at least one bubble vial being between the arms.

Abstract: An apparatus (10) for positioning hanging objects (2) on a wall has a base member (12), a pair of spaced-apart support arms (18), each having an upper end (20), extending from the base member. At the upper end of each support arm is a line receiver (30) for releasably engaging a line (4) extending from a frame (6) of the object. To enable the individual to place a mark on the wall for the location of a hanger to support the object, the line receiver may have an opening (34) extending therethrough. A telescoping height gauge (36) is mounted to the base member to locate a top edge (8) of the frame with respect to the line suspended front the line receivers. To assist in placing the line receivers in a horizontal relationship on the wall, the apparatus has a level indicator (40). A handle (42) extends from the base member. To add additional strength to the apparatus, a brace (24) can be extended between each support arm and the base member. Also, the support arms can be pivotally mounted to the base member.

Abstract: A new geometric instrument-compass for a practical use that allows the trisection of an arbitrary angle as well as retains its effective functionality for operations that can be performed by the conventional compass is disclosed. The design proposed makes this new compass universal in terms of its applicability, namely, it can be used in a vertical position as the conventional compass (depending on the purpose or convenience of the user) and can be used in horizontal position (if it is required to perform the trisection of an angle or even some other operations generally performed by the conventional compass). The simplicity of the design and effectiveness of operations makes this instrument an attractive tool for practical application.

Abstract: A router table sled for use with a router table and a router table fence includes an arm assembly that rides along the fence and a strut assembly that supports the workpiece. The arm assembly includes a slider that slides along an upper edge of the fence and an arm attached to an upper edge of the slide. The arm is usually in a position perpendicular to the slide. The arm is also coupled to a strut assembly that includes a main strut, and two additional struts located beneath the main strut. Each strut includes a longitudinally-centered T-shaped slot formed into top, front, and rear faces. The front faces of each strut lie substantially within the same plane. The two lower struts have opposing edges that are spaced a predetermined distance from each other. When a workpiece is clamped to the faces of the struts, an edge may be placed against the fence. The workpiece may then be moved across the router bit to produce a square cut.

Abstract: The present invention relates to a segmented, combination level and square that has a rotating joint. In a preferred embodiment, this hand tool provides the user with many optional tools in one. The tool can be configured as a level, a T-square, a framing square, a T-bevel, or a pocket square. In a preferred embodiment, this multi-segmented combination tool also provides the user with a convenient way not only to configure a level, in one inch increments, to any length from several inches to at least ten feet in length, but also to create more than one tool at a time such as a T-level and a framing square. In other preferred embodiments, the user is provided with optional features that enable them to carry on-site a single tool that can perform all tasks needed to do general construction layout such as roof framing.

Abstract: An angle guide instrument having particular utility for handrail installation which includes a body portion having an outer arcuate edge and first and second arms which are pivotable with respect to the body and are used in conjunction with levels mounted to the body for determining angles for purposes of cutting sections of handrail. In a preferred embodiment the arms include extensions which are profiled so as to be cooperatively seated with a section of handrail.

Abstract: A device for connecting the arms 4 of an angle, in particular a construction angle, comprises a corner piece 1 with two rails 5 which are at right angle to each other and to which the arms 4 which are formed by straight battens are connected by clamping bands 6.

Abstract: Miter joint cutting apparatus includes a base, and an adjusting member mounted on the base for relative sliding movement to a position along the direction of a saw line. A workpiece locating mechanism is mounted on the base for angular adjustment with respect to the saw line, and includes a pair of elongate guide boxes wherein each box has a lower lateral wall parallel to the base for supporting a workpiece with a forward end of the wall pivoted to the adjusting member, and a vertical wall extending from the lower wall. The lateral wall is coupled to the base via a projection which slides in a lateral slot in the base, as the guide box is moved by operation of the adjusting member.

Abstract: The present invention herein called "LABEs", comprises a manipulative for assisting students in the visual understanding of the relationships of all angles in a rectangle, triangle, or other such geometric shapes relative to their side lengths, thus allowing the student to prove theorems used in the teaching of geometry. The manipulative further comprises a disk having indicia representing a 360 degree compass, the disk having a first fixed leg, bearing indicia in units of length, extending from the disk at a point adjacent the zero degree indicia mark, and a second leg, having a sleeve portion, which is pivotally attached to the center of the disk by a snap grommet, the sleeve portion being capable of accepting the fixed leg of a second LABE in a longitudinal, adjustable manner therein.

Abstract: An attachment for a chain saw that allows the angle of a cut to be controlled with great precision. The attachment consists of a rigid, rectangular guide frame with an open window construction. An approximately U-shaped blade mount is hingably attached to the guide frame, thus allowing a saw blade to be inserted through the open window of the guide frame and mounted onto the blade mount. The blade mount, and thus the attached saw blade, can move in an arc with respect to the guide frame, and the attachment includes a selecting means by which to determine the angle between the blade mount and the guide frame and a tightening means by which to secure the blade mount and guide frame in the desired position. An additional feature is a directing fence so as to control the direction of a cut. The fence consists of a first and a second bar that are hingably mounted to one another and can thus be rotated and secured so that any desired angle is set between them.

Abstract: The present invention relates to a segmented, combination level and square that has a rotating joint. In a preferred embodiment, this hand tool provides the user with many optional tools in one. The tool can be configured as a level, a T-square, a framing square, a T-bevel, or a pocket square. In a preferred embodiment, this multi-segmented combination tool also provides the user with a convenient way not only to configure a level, in one inch increments, to any length from several inches to at least ten feet in length, but also to create more than one tool at a time such as a T-level and a framing square. In other preferred embodiments, the user is provided with optional features that enable them to carry on-site a single tool that can perform all tasks needed to do general construction layout such as roof framing.

Abstract: A folding drafting aid apparatus includes a planar member having a first and second planar member ends and a first planar member side and a second planar member side, and being foldable at a hinge structure so that the second planar member side pivots face to face against itself; a flexible, resilient first tab having a free end and retained on a first tab structure; and a flexible, resilient second tab having a tab free end and retained on a second tab structure; where the tabs are positioned relative to each other so that when the planar member is folded at the hinge structure to pivot the second planar member side face to face against itself, one tab overlays the other tab and so that pressing one tab against the other tab causes both tabs to bend until the free end of the one tab crosses over the free end of the other tab and remains in this crossed-over position to hold the planar member in the folded position.

Abstract: A drawing instrument including two rulers each having a head portion, a circular protrusion formed on one of the head portions, and a circular recess formed in the other head portion for slidable engagement with the circular protrusion, the rulers are guided to rotate relative to each other by the slidable engagement between the circular protrusion and the circular recess. The head portions can be easily coupled together without additional tools or without additional coupling devices.

Abstract: A method for using an endoscopic apparatus for measuring the size of a hernia defect comprising a handle which is pivotally attached to a measuring rod. The hernia defect is measured by a plurality of calibrations positioned along the measuring rod. The measuring rod includes a blunt tip at its distal end and further is adaptable for 180' positioning relative to the handle.

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 marking tool that can be used for locating structural fixtures having a body portion, first and second perpendicular legs slidably contained entirely within the body portion. Each of the first and second legs are extensible from the body portion to position the body portion in a preselected location. At least one template is associated with the body portion such that adjusting the first and second legs positions the body portion and its associated template over a selected one of the fixtures for locating the same.

Abstract: A scissor-like device is described which can be used to measure the diameter of a tendon graft or bone plug. The device can also be used to hold a tendon graft or bone plug in a fixed position while multiple sutures are inserted in the end thereof. The device includes a pair of arms which are hinged at the proximal end. The inner surface of each arm includes a series of semicircular sizing sleeves which mate with one another to form a series of cylindrical sleeves of increasing diameter. A tendon graft or bone plug can be placed in the series of sleeves to determine the proper diameter of the graft or plug. Various measuring indicia are provided along the arms of the device to provide an indication of both the diameter and length of tendon tissue to be measured.

Abstract: An improved measuring apparatus (10) including male (12) and female (11) measuring instruments equipped with complimentary pairs of male (14) and female (13) sleeve bodies bearing a multiplicity of variably aligned calibrated indicia (50) representative of different drawing scales; wherein, the male (12) and female (11) measuring instruments are adapted to be captively engaged in L and inverted L configurations as well as in an end to end straight line configuration.

Abstract: An adjustable angle instrument for high precision craftsmanship is configured from a pair of similar metal sector parts, each having a sector shape with a wide double flange along a straight edge. The two sector parts are accurately pivoted together in an apex region. Each flange is made to have accurate surfaces on its outer surfaces on which the instrument may be stood in a vertical position or laid horizontally on a flat surface such as a saw table. The flanges may be set to any angle between 45 and 90 degrees as indicated by a calibratable hairline cursor, and the angle may be captured by locking the two sector parts together by tightening a knurled brass knob. One of the sector parts is also provided with an edge which is accurately machined at 90 degrees relative to the flange and thus may be set to any angle between 0 to 45 degrees relative to the other flange, providing the instrument with a total range of 0 to 90 degrees.

Abstract: A system for measuring an inputting range of motion data to a computer comprises a goniometer for measuring range of motion and for producing a range of motion signal from those measurements. A plurality of switches are carried by the goniometer for producing control signals. An interface device receives the range of motion signal and digitizes that signal to produce range of motion data. The interface device also receives the control signals which are used to control the input of the range of motion data to the computer.

Abstract: A table saw gauge includes a body positionable on the table top of a table saw and having a first scale for determining the saw blade height, a second scale for determining the saw blade angle, and a third scale for determining the distance from the saw blade to an adjacent fence. A blade is pivotally supported on the body and includes a first armature for engaging the uppermost tooth of the saw blade to determine saw blade height and second armature engageable with the side of the saw blade to determine saw blade angle. Pointers mounted on the body will aid cooperation with the first and second scales mounted on the body to indicate the height of the saw blade and the angle of the saw blade, respectively.

Abstract: The disclosed measuring instrument includes a pair of members arranged together to form a right-angled L and the members having indicia providing linear scales useful in measuring areas in architectural plans and the like. The members are separable at the joint that forms the corner of the L and are further capable of re-connection to each other in end-to-end relationship so as to provide an elongated straight edge. The junction of the members at the corner of the L includes a pivot about which one member may be moved through a 180.degree. range to form an inverted L. In a modification, at least one of the members includes a wing element along one edge and rockable about a separable pivot on an axis parallel to that one edge.

Abstract: A combination simple and compound mitre gauge along with a precision split fence constitute the subject matter of the present invention. Both the mitre gauge and fence are intended to be utilized with power woodworking tools. The mitre gauge constitutes both a simple and compound gauge by utilizing an elongated member which slides in a groove on the supporting table and a suppport plate coupled with the member which is movable about a vertical axis and can be held in a given position by appropriate locking means. The support plate presents a vertical surface which mounts a guide that can be moved into one of two positions to vary the length of it. The guide may also be removed and a planar surface presenting shoe pivotally coupled with the support plate. The angle of the planar surface of the shoe may be varied and means is provided for locking the shoe in any given position.

Abstract: A measuring device for topographic sheets includes top and bottom transparent arms that pivot relative to a connecting pivot. A plurality of different distance scales on each arm provide for measuring the distance between two points on a topographic sheet. A protractor on the top arm and pointer marks on the bottom arm provide an indication of the extent of rotation of one arm relative to the other. The device is suitable for measuring distance between points, azimuth, scale and position of true north on an aerial photo. A slidable cross-hair member is used on either arm. One embodiment has a protractor affixed to the top arm and another has the protractor rotatable and removable from the top arm. A third embodiment has the bottom arm offset from the center of the protractor and the bottom arm slidable relative to the top arm.

Abstract: An improved guide apparatus for replicating angles of the type having a main member with a straight edge, a bubble-level device on the main member, and an angle arm pivotably attached to the main member. A slot in an end of the main member receives the angle arm, and a bolt which extends through the main member and the angle arm to form a pivot point has a hand-tightening nut or the like on it for quick angle replication in direct and reverse angle situations without additional tools. In some preferred embodiments the slot extends through the entire main member and/or the opposite surfaces thereof are tapered at the pivot connection to facilitate tightening even though the main member is of substantially rigid construction.

Abstract: A collapsable framing square is comprised of first and second flat rigid arms, a pivot pin permanently attached to one side of the first arm, a pivot plate permanently attached to the second arm defining a hole with a diameter equal to that of the diameter of the pivot pin such that the pivot plate fits over the pivot pin, a spring situated over the pivot pin to engagingly bias the pivot plate against the first arm and a washer and C-clip for securing the spring onto the pivot pin. A washer situated between the spring and the pivot plate includes a projection extending downwardly from the side of the washer facing the pivot plate while the pivot plate includes a plurality of chamfered holes situated about the hole defined by the pivot plate to receive the downward projection.

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: A carpenter's protractor for use in scribing angled lines on a board or for guiding a portable saw in making angled cuts of a board. The protractor has an angularly adjustable arm which extends outwardly from opposite faces of the protractor body to enable the protractor to be used with either face of the protractor in engagement with the flat surface of a board and with either of a pair of opposed, parallel edges of the adjustable arm in engagement with a straight edge of the board.

Abstract: A system and method for determining cutting lines for cabinet top joinery without measurement of angles apparatus for apparatus for positioning against walls between which a cabinet top is to be installed and a transfer device for establishing a distance between a selected points on the apparatus. A saw guide incorporates a linkage arrangement adapted for mating with the transfer device so as to establish a cutting angle which bisects the angle of intersection of the walls. Another mechanism is provided to automatically determine offset cutting angles using only the transfer device.

Abstract: An improved adjustable protractor including a flat base member in pivoted connection with a pivoting member. The base member is calibrated with degrees indicia. The pivoting member includes an indicia indicator to detect designated degree indicia. Clamp is provided to clamp members together at a selected position.

Abstract: An adjustable carpenter square for use in determining the relative angles between two predetermined points defined by a pair of longitudinal extensions pivotally attached together at one end.

Abstract: The invention relates to rotating saw blade adjustment devices in general, and more specifically to a very simple apparatus, comprising two metal brackets, which when used in conjunction with an adjustable triangle and/or framing square, can provide precision adjustments for either a radial arm saw or a table saw.

Abstract: Mounting structure is provided for support from one side of an elongated body of a carpenter's level having a window extending transversely therethrough and opening through the aforementioned one side of the body. The mounting structure pivotally supports one end of an elongated arm from a first end of the body for swinging between a first position in superposed parallel relation to the aforementioned one side of the body and a second position with the arm projecting at 90.degree. relative to the body. The window in the body has a spirit level mounted therein and the arm includes a portion thereof in registry with the window having an opening formed therethrough. Also, the mounting structure and arm include coacting first latch portions for releasably retaining the arm in the second extended position thereof and second coacting latch portions for releasably retaining the arm in the first position thereof.

Abstract: A device for determining the mean cardiac axis for aiding in the interpretation of an electrocardiograph includes a disc shaped member having a pair of radially extending arms pivotally attached to the center of the disc. The disc also carries a plurality of radial line markings thereon and preferably spaced every fifteen degrees. At least two of the radial markings, the one at 0.degree. and the one at 120.degree. representing the first and third EKG leads, have millimeter graduations thereon. Each arm has an elongated slide thereon which when positioned at the proper magnitude setting along the proper radial marking intersects the other slide to indicate the cardiac axis.