Abstract: A level comprises a frame defining first and second parallel channels and first and second rails fitted slidingly in the first and second channels respectively. The level is adjustable in length by sliding the rails in the respective channels of the frame.

Abstract: The present invention is an extensible carpenter's level that is adjustable between a collapsed position and a fully-extended position. The level may be manufactured in a variety of sizes. An exemplary embodiment of the level is comprised of an innerslide and two outerslides. The innerslide has two sets of tracks or tongues. Each of the outerslides is slidably connected to the innerslide. In particular, one outerslide is adapted to slide along one set of tracks or tongues, and the other outerslide is adapted to slide along the other set of tracks or tongues. At least one of the slides includes at least one level bubble. The level preferably includes multiple level bubbles to enable a variety of measurements, e.g., a horizontal level, a vertical level, and a 45° level.

Abstract: An extendable carpenter's level which comprises a pair of extending body members capable of adapting and mounting upon the standard “I” level frame configuration of a carpenter's level by sliding said extendable body members onto the frame of the standard level. Each extending body member consists of a top and bottom slide extension rigidly attached to one another so as to be firmly in contact with the level frame. The top and bottom slide he extensions each incorporate a lock pin to insure rigidity as against the level frame and stop clips to eliminate outward extension of the extending body members beyond the end of the level frame. In another embodiment, each extending body member is split such that both the top and bottom slide extensions comprise generally a right and left side extension held together by means of slide springs and flush mounted screws.

Abstract: A new level having a very rigid and rugged construction in the form of solid blocks between four track members that guide the relative movement of the level frame and level extension. The track members and extension provide planar surfaces the length of the extended level on the top and bottom. The extension includes handgrips to assist in both extending and using the level. As an option, a rotatable spirit vial is located in the extension. The rotatable spirit vial may be set for any angular degree between the horizontal and the vertical. Thus, angular pitches may be accurately determined with as much ease as the horizontal or vertical.

Abstract: A modular level, which functions as a level for construction trades, comprises a pair of levels which combine to function as one level. The levels also may be separated so that each level may be individually used as a level.

Abstract: A level includes a level vial device detachably secured to a housing without additional fasteners or tools. A latch is rotatably secured to the housing and has a tongue for selectively engaging with and securing the level vial device to the housing. A seat and a cap are secured to the housing, the latch includes one or more spring legs rotatably secured onto a hub of the cap. The housing includes two side walls engaged with the seat for securing the seat to the plate. One or more bubble vials may further be secured to the plate with two covers.

Abstract: A level apparatus is provided with an elongate level and a support. The level and the support each have opposed ends, front and rear faces and top and bottom faces. The top and bottom faces of the support are substantially planar and parallel to one another, and the top and bottom faces of the level are substantially planar and parallel to one another. A central position on the support is pivotally connected to the level such that the rear face of the support is in opposed facing relationship to the front face of the level. The level can be used in a conventional manner without utilizing the support. However, the support can be pivoted relative to the level into an orientation where the top or bottom face of the support can be positioned on the upper face of a beam such that the level extends downwardly from the support and the beam. The level then can be used to define a plumb line to which other structural elements can be positioned or compared.

Abstract: A telescopic leveling instrument has a small and light-weight bubble-level block (1) with orthogonal walls that include a rectangular first end (3) and a rectangular second end (4) from which telescopic markers are extended. The telescopic markers can include circular telescopic tubes (2), square telescopic tubes (11) or rectangular telescopic tubes (12). The bubble-level block is articulated to be finger-held with a first hand of a user for positioning it against an object while with a second hand, the user is utilizing the telescopic markers for measuring and marking a desired position selectively in relationship to the object against which the bubble-level block is being held. Attachable to extendable ends of the telescopic markers can be a selection of marking aids (17, 18, 19, 20, 21, 22, 23, 24). Preferably, the telescopic markers are ruled with distance indicia for fine measurement.

Abstract: A new level having a very rigid and rugged construction in the form of solid blocks between four track members that guide the relative movement of the level frame and level extension. The track members and extension provide planar surfaces the length of the extended level on the top and bottom. The extension includes handgrips to assist in both extending and using the level. As an option, a rotatable spirit vial is located in the extension. The rotatable spirit vial may be set for any angular degree between the horizontal and the vertical. Thus, angular pitches may be accurately determined with as much ease as the horizontal or vertical.

Abstract: A modular level is formed of unequal length first and second components which may be joined to form a single, elongate level or alternatively joined to form a framing square. Each component includes a series of level vials, enabling each component or joined components to be used for determining horizontal and/or vertical lines. The first component has a pair of pins extending from one end, parallel to its elongate axis. The second component has a first pair of passages in a first end parallel to its elongate axis, for joining the two components end to end to form a single long level. The second component also has a second pair of passages in its second end orthogonal to the first passages, for joining the two components at right angles to form a framing square. A storage compartment may also be provided in one component.

Abstract: A means of extending the useful length of standard spirit levels currently in production and in use throughout the world. The length extension hardware is comprised of pairs of extender sleeves which fit over the core level to be extended and provided with means to secure the configuration at any selected length between the minimum and maximum lengths attainable with the core level and extender sleeve set being employed.

Abstract: A level comprises a frame defining first and second parallel channels and first and second rails fitted slidingly in the first and second channels respectively. The level is adjustable in length by sliding the rails in the respective channels of the frame.

Abstract: A level including a frame having a reference surface, a level sensor secured to the frame, and an articulated arm pivotally connected at one end to the frame for securing the reference surface to a test surface. The articulated arm includes an inner member pivotally connected to the frame at one end and an outer member extending from a free end of the inner member. The inner member is rotationally biased against the frame while the outer member is pivotally connected to the inner member and rotationally biased against the inner member. The inner and outer members are rotationally biased in opposite directions for folding against the frame. The level may also include spools, idler wheels, take-up fingers, and swivels for supporting the band.

Abstract: A level comprises a frame defining first and second parallel channels and first and second rails fitted slidingly in the first and second channels respectively. The level is adjustable in length by sliding the rails in the respective channels of the frame.

Abstract: A modular level, which functions as a level for construction trades, comprises a pair of levels which combine to function as one level. The levels also may be separated so that each level may be individually used as a level. An adjustment mechanism calibrates and adjusts the position of the vial relative to the reference edge.

Abstract: The present invention is an extensible carpenter's level that is adjustable between a collapsed position and a fully-extended position. The level may be manufactured in a variety of sizes. A preferred embodiment of the level is comprised of an innerslide and two outerslides. The innerslide has two sets of tracks or tongues. Each of the outerslides is slidably connected to the innerslide. In particular, one outerslide is adapted to slide along one set of tracks or tongues, and the other outerslide is adapted to slide along the other set of tracks or tongues. At least one of the slides includes at least one level bubble. The level preferably includes multiple level bubbles to enable a variety of measurements, e.g., a horizontal level, a vertical level, and a 45° level.

Abstract: An apparatus for measuring and plumbing. The apparatus contains a slide element slidably mounted to a body element. The body element is fixed to a base element. The slide element defines a viewing channel for viewing a side level fixed to the body element. The slide element has a pair of longitudinal trapezoidal rails fixed to the back of the slide element and running its length. The body element has a pair of longitudinal trapezoidal channels along the front of the body element. The channels within the body element receive the rails of the slide element to slidably fix the slide element to the body element. The slide element may be moved along the body element to a set position, the apparatus aligned, and the slide element locked into place for measuring or plumbing.

Abstract: An optical calibrating apparatus includes: a laser illuminator (6) disposed in an eccentric adjusting sleeve (5), an inner inclined adjusting sleeve (4) within a jacket (3), an outer inclined adjusting sleeve (2) outside the jacket (3), and a cylindrical casing (1), in which a laser line is emitted by the illuminator (6) for checking levelling, plumbing and verticality and the laser line has been calibrated for a horizontality or a verticality by rotating the eccentric adjusting sleeve (4), the inner and outer inclined adjusting sleeves (4, 2) until the emitted laser line is aligned with a standard laser line emitted from a standard optical calibrator or aligned with a mark preset by a standard instrument.

Abstract: A plummet level for checking the horizontal state of a surface and locating two vertically spaced points generally required by wood working in most interior decorative works. The plummet level includes a rectangular main body divided into front and rear compartments for balance beam and weight-loaded swing link, respectively, to mount therein on a central pivot shaft. Two long clear windows are separately provided on walls of the main body facing the balance beam and the swing link. A plurality of spaced and parallel check lines horizontally extend a full length of the windows. A user may visually overlap one of the check lines on the windows and a reference level/vertical line on the balance beam/swing link to check a working surface for its horizontal or vertical state.

Abstract: A multipurpose retractable leveling device including a pair of side housings each having a generally rectangular configuration. A central level portion is positioned between the pair of side housings. The central level portion is defined by a rectangular housing with a vertically oriented spirit level and a horizontally oriented spirit level. A pair of strings have first ends secured to a first side housing with the strings extending through the central level portion with second ends of the pair of strings extending inwardly of a second side housing whereby the central level portion is slidably disposed on the pair of strings. A locking retractable spool is disposed within the second side housing for engaging the second ends of the pair of strings.

Abstract: An electronic level is provided including a central member having a rectilinear configuration and an electronic level indicator mounted thereon.

Abstract: A level apparatus for spanning two spaced apart building structure points and indicating whether the points are level relative to each other includes an elongate tubular segment having a tubular segment longitudinal abutment face for abutting a building structure point; an extension segment slidably retained within the tubular segment for slidingly extending partly out of the tubular segment and having an extension segment longitudinal abutment face for functionally extending the tubular segment longitudinal abutment face when the extension segment is extended; and a longitudinally oriented bubble site glass.

Abstract: This invention relates to an extendable level which, by means of two slidable extension members on a central body, can more than double its collapsible length. The invention comprises a device which can lock the level in any length from fully collapsed to fully extended. An attachment is provided which can convert the invented level into a large carpenter's square. Further, the extension level, with a scale on its top edge, can measure inside lengths between opposing wall surfaces.

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 for comparing compliance of a grade to a predetermined slope includes a block and a level. The block has at least one notch positioned at a distance from a first end of the block such that when the method of this invention is practiced, a level indicator will indicate whether a grade on which the apparatus is resting matches a predetermined grade. A method of this invention includes the steps of inserting an arm of predetermined length into the notch and placing the joined block and arm on a grade. A level is placed at the arm to thereby compare compliance of the grade to a predetermine slope.

Abstract: A combination level has a carrier forming two opposite parallel major surfaces. A tube level is mounted on one of the surfaces of the circular level and a circular is mounted on the other, opposite, surface. either one of the major surfaces can be used directly to abut against a work to be aligned or an additional, preferably elongate, member can be attached to the carrier and which abuts against the work. The carrier is mounted on the abutting member at known angular relationship or the carrier can be mounted for selected angular adjustments abutting to the abutting member, so that selected positioning of the tubular and circular levels are relative to each other on substantially horizontal planes where contact of the work, allows measurement of vertical alignment and plumb condition of the work.

Abstract: A method and apparatus (10) for aligning a towed vehicle (12) with a towing vehicle (14) is disclosed. The method is implemented with an alignment apparatus (10) including a base (22) configured for attachment to the towed vehicle (12), a platform (23) rotatably mounted on the base (22), and a level device (24) mounted on the rotatable platform (23). While the towed vehicle (12) is connected to the towing vehicle (14), the platform (23) and level device (24) are rotated until the level device (24) is in its level position. This sets a reference height position for the towed vehicle (12). When it is desired to reconnect the towed vehicle (12) with the towing vehicle (14), the towed vehicle (12) is raised until the level device (24) is once again in its level position. In one embodiment, the alignment apparatus includes a base hingedly connected to a mounting bracket for permitting side-to-side leveling of the towed vehicle.

Abstract: An inclination indicating apparatus having a housing with a base defining a first plane. A plurality of support legs support the base of the housing above the surface in an operational configuration. At least one of the support legs is rotatable so that a bottom portion of the at least one support leg traverses a second plane parallel to the first plane from the operational configuration to a storage configuration. A circular float level mounted on the housing having a bubble indicator provides an indication the slope of the first plane relative to the surface.

Abstract: An infinitely adjustable level with a pair of extenders that extend out from opposite ends of a central body. The level vials can be attached to the extenders, to the central body, or to the extenders and the central body. In this manner the level vials will never be obscured as the extenders are adjusted, no matter what the length of adjustment might be. Also, this form of adjustment allows the level to be used where both ends must butt against objects and there is no way the level can overhang.

Abstract: An expandable level device includes a central housing having a horizontally oriented tubular spirit vial disposed within a front wall thereof. The central housing has an extension rod slidably extending outwardly of opposing end portions thereof. A pair of outer housings each has a vertically oriented tubular spirit vial disposed within a front wall thereof. Each of the outer housings slidably receives a distal end of one of the extension rods therein.

Abstract: A hand tool for leveling operations includes level and plumb indicators in an elongated, linear support member, or body. Disposed on opposed ends of the support member are first and second telescoping extension members. By positioning the distal end of one extension member in a recessed point or line on a wall, commonly known as a "quirk", and using the level indicator, a point or a line on another adjacent wall at the same elevation, or height, may be precisely located. The opposed extensions may also be used with a ruler to precisely measure the vertical distance between a structure inaccessible by a conventional level, such as a doorway header, and the edge of an adjacent structure, such as a ceiling beam. Another embodiment includes a plurality of spaced, retractable projections along the length of the support member which are particularly useful for leveling a structure such as where the level is too long for positioning within the structure, such as a doorway.

Abstract: A collapsible, compound level apparatus is provided and includes a first linear leveling section and a second linear leveling section. Each section includes at least one flat surface for contact with a work surface, and first and second bubble levels arranged for indicating level and plumb, respectively, of the work surface. The first section provides at one end thereof an engagement tongue that engages an engagement groove of one end of the second section, thereby providing colinear interconnection of the leveling sections and forming an integral linear structure for positioning the flat surfaces of each section in mutually coplanar contiguous alignment. The engagement tongue has an oblique surface and an end stop surface for contacting a mating oblique surface and a mating end stop surface of the engagement groove. The oblique surfaces and the mating end stop surfaces of each section form an acute angle.

Abstract: An expandable level is provided, which consists of a main frame, at least one leveling vial mounted within the main frame, an extension frame and a mechanism for adjusting the position of the extension frame with respect to the main frame, so that an effective length of the level can be increased and decreased.

Abstract: An interlocking screed level and method comprising a rectangularly-shaped screed section having a top surface, a bottom surface, a front surface, a back surface, and a first and second end. A rectangular preform extension member of a lesser dimension than the exterior boundary of the screed section extends axially from the first end of the screed section. A rectangular joint recess extends axially from the exterior of the second end of the screed section and has a depth commensurate with the length of the extension member with a boundary of minimally less than the extension member for receiving extension members of adjoining screed sections. A first lock component is located at the first end of the screed section and a second lock component is located at the second end of the screed section. A bottom surface for planing concrete surfaces is provided. A level gage is provided in the top surface for ensuring levelness of the concrete surface.

Abstract: A level includes a plurality of telescoping members locked in a telescoped position, whereby the effective length of the level is adjustable so that the level is useful in establishing horizontal for a structure of an extended length and for establishing a plumb line.

Abstract: An all-purpose level in the form of a box that contains a ball rolling on an upwardly concave surface that is a figure of revolution about a vertical axis. The box rests on a member which will be horizontal when the level is in engagement with a truly vertical or horizontal surface. For this purpose, the member is disposed at a right angle to a plate which is hingedly connected to another plate about an axis perpendicular to the plane of the member. The member is selectively lockable in that perpendicular relationship; but when released, the member folds against the first-mentioned plate and the device thus folds about two hinges at right angles to each other, thereby to provide a configuration in which the level can rest on a generally horizontal surface to indicate true horizontal orientation thereof.

Abstract: A pocket sized telescopic level apparatus includes a plurality of at least three telescoping tubular sections including a largest section and sequentially smaller sections, each section having an exterior diameter and a longitudinal bore with an interior diameter, and wherein the sections are of sequentially larger external diameter so that one section fits into an adjacent section and all sections are contained upon the largest section in a collapsed position. A level bubble member is disposed at an end portion of the largest section and a plurality of shims form interfaces between the end portions of adjacent sections upon extension of the apparatus. The shims are tubularly shaped and positioned between the outer wall of an end portion of one section and the inner wall of an adjacent section.

Abstract: An extensible carpenter's level includes a pair of body members in end-to-end relationship and a pair of extenders mounted in face-to-face relationship on the body members. The extenders are slideably retained in tracks on the body members. The body members have longitudinal slots and the extenders have locking means passing from the extenders through the longitudinal slots on the body members for locking the body members and extenders into relative position. The body members, and preferably also the extenders, have level indicating means thereon, and are separable from the device as a whole for convenient individual use. When assembled, the body members can be slided apart to accommodate a desired length within a span up to about twelve feet, the reference edges of the body members remaining co-linear at any extension length.

Abstract: An attachment for connection with an elongated carpenter's level for forming an enlarged squaring tool, the level having a central web portion with spaced apart bubble indicators and parallel flanges at opposite end edges of the web portions. The attachment has an elongated arm member of rigid material with a connector arm fixed to and extending from it at a right angle. The connector arm has an elongated slot means forming a pair of spaced apart connector members, each having a peripheral cross section similar to but slightly smaller than the cross section of pockets located on opposite sides of the level web portion so that the connector members can be moved axially into said level pockets to firmly, but temporarily, secure the attachment to the level.

Abstract: An extendable level consists of two interslidable parts having a track and slide strips in a simple construction, wherein there is always a planar relationship between the level edges. The slidable extension rests within the length of the main body when unextended.

Abstract: A standard three foot carpenter's level with two sleeve-like extensions adjustably movable upon it to provide accurate plumbing and trueing facilities to six foot-six inch and eight foot lengths. The top and bottom surfaces of the base level have projections which fit into top and bottom interior surface slots in the extensions to prevent transverse motion between the base level and extensions while minimizing surface contact and wear between the two. A centered slot in each of the two opposing side walls of each extension limit the contact with and wear between those walls and the mating flat side walls of the base level. The front face of the base level contains a pair of depress buttons to engage apertures in each extension to set the 6'6" or 8' length. The base level contains three bubble vials, one at the midpoint and the other two equal distant from and on opposite sides of the mid-point vial.

Abstract: An extension level apparatus suitable for use with a carpenter's level includes in combination a pair of elongated frame members adapted to receive therein the carpenter's level and also includes a spring loaded extension member which permits the extension level to be retained in a wall opening into which a door is to be inserted. The extension level permits the user thereof to determine rapidly the exact vertical position of one vertical edge of the door jamb, allowing for shimming where necessary, and permits a measurement to be taken from a starting point to an end point where the second edge of the door opening is to occur. Hereagain the vertical alignment may be rapidly obtained with the use of shimming when necessary, thereby permitting the door jambs to be inserted rapidly and with accuracy.

Abstract: An adjustable level apparatus (10) comprising a core level unit (11) provided with a pair of extension arm units (12) that are formed by upper (25) and lower (26) housing casings that are connected together through the core level unit (11), and the extension arm units (12) are further provided with extension leg units (13) on their ends, having an extension leg that is extendable perpendicular to the axis of reciprocation of the extension arm units (12) on the core level unit (11).

Abstract: An apparatus for measuring the plumbness of vertical studs of building structure frames includes a vertical main body member with a horizontal vial therein and having first and second opposed, plane, parallel surfaces, first and second vertical extension members being connected to said main body member and slidably engaging said first and second plane, parallel surfaces, respectively, first and second quick-release mechanisms releasably locking said first and second vertical extension members to said main body member, a first offset member connected to the upper end of the first vertical extension member and extending to an imaginary plane that is parallel to the first surface, and a second offset member extending from the bottom of the second vertical extension member to the imaginary plane.

Abstract: A plumb measuring device fabricated from a plurality of detachable modular assemblies includes a first assembly provided with an alignment bar, a scale plate pivotally mounted to the bar for determining the plumbness of a vertical surface, a bubble level attached to the scale plate to determine the level line of a vertical surface, indicia marked on the bar for reading the scale. A second scale plate is pivotally mounted just above the first scale plate for determining the degree of tolerance from plumb. A second modular assembly comprising interchangeable alignment bar extension members to be attached to either end of the bar for increasing the length of the measuring device. A third modular assembly comprising spacer means for detachable connection with the first or second assemblies to act as stand-offs to bridge distorted intermediate regions on a vertical surface. A compass is provided for attachment to the top of the first or second assembly for determining whether a driven pile has been rotated.

Abstract: A combined distance and gradient gauging device is disclosed, including a base member, and at least one arm member slideably connected with said base member for parallel longitudinal displacement between collapsed and fully extended positions relative thereto, respectively, characterized in that the arm member is manually displaceable between a plurality of predetermined longitudinally displaced intermediate positions, relative to the base member so that the remote end extremities of the base and arm members are spaced at corresponding predetermined gauge distances, respectively.

Abstract: A chalk line protracting tool comprising a housing defining a compartment for holding chalk and line; a chalk line guide; and a level. A chalk line is fed from a manually operated reel, through an aperture between the compartment and the exterior of the housing, in a straight line to the guide and is protracted in a continued straight line for a desired distance where the line may be snapped against a surface for marking. The level is in a known angular relationship with the aperture guide axis whereby a protracted chalk line along the axis may provide a marking of desired length and at a known angle relative to level.

Abstract: A method and apparatus to obtain performance data for maximum cruise economy on any particular aircraft by means of a device comprising three thin round flat disc concentrically mounted to one another. Various aircraft performance scales are imprinted upon the rotatable discs and there is provided an indicating pointer which may be set in a level position based upon the readings of the calibrated scales and based upon the throttle setting of the aircraft while in flight to give maximum cruise economy.

Abstract: A straight edge level is provided which is comprised of a level body having a plurality of conventional leveling bubbles thereon, and a sliding scale member which is extendable from but substantially planar the level body itself. In the preferred embodiment, a scale is provided on the surface of the level body, and a second scale provided on the surface of the slide member. In operation, an extension of the slide member will produce a scale reading at the end portion of the level body from which the slide member extends. The scale provided on the level body begins its numerical climb from that same location on the level body. Thus, in operation, the user can add the numbers appearing on the two scales and get a desired overall measurement.

Abstract: A carpenter's level extendable preferably from a length of 24 inches to a length of 48 inches in six-inch increments is described. The level includes an I-beam shaped base section with right and left extension members slidably mounted thereon. Said extension members engage either side of the base at tracks formed by the side extensions of the I. The extension sections are independently movable relative to the base and to each other, and a locking mechanism is carried by each extension section to lock said section against lateral movement in a predetermined extension position. Each extension section carries a conventional tubular spirit level vial in an aperture and a third vial is centrally located in an aperture through the base section. Each extension section and the base section also has apertures therethrough spaced on, for example, six-inch centers for visible observation of each vial whether the members are extended or collapsed.