Slab doctor level

Abstract

An instrument for ascertaining whether a surface is horizontal, vertical, or at 45* angle, consisting essentially of an encased, liquid-filled tube containing an air bubble that moves to a center window when the instrument is set on an even plane. Also called a spirit level. A box level including an elongate body, plumb and level vials, and spaced handholds having outer edges together defining first and second parallel application planes beyond first and second face planes of the elongate body.

Description

FIELD OF THE INVENTION

This invention relates generally to spirit levels and, more particularly, to what are referred to as box levels.

BACKGROUND OF THE INVENTION

Box levels of the type to which this invention pertains each include an elongate body which defines vial openings with plumb vials secured therein, a pair of spaced hand-hold openings, and in many cases hang openings near the opposite ends of the body to allow the levels to be hung on pegs or other hangers for storage purposes. The elongate bodies are typically of hollow box-like configuration. Such elongate bodies, of course, further define opposed first and second face planes, as well as narrower flat edge surfaces.

Each such box level also includes a pair of hand-holds, often of plastic and/or rubber-like material, lining the two hand-hold openings and secured in such openings to the elongate body. These two hand-holds have outer edges near each of the face planes of the elongate body—i.e., on either side of the elongate body. The outer edges of the two hand-holds on each side of the elongate body together define a parallel application plane just beyond the corresponding face plane. Thus, each hand-hold has first and second outer edges, and the first outer edges of the two hand-holds define an application plane just beyond the first face plane while the second outer edges of the two hand-holds define an application plane just beyond the second face plane.

These hand-holds provide, on each face of the box level, an appropriate reference plane for application of the box level against work surfaces, the orientations of which are being determined. When rubber-like hand-holds are used, the level is resistant to slipping that may make surface gauging somewhat problematic.

Given the need in the construction industry for box levels in longer lengths, it has been difficult to manufacture due to transportation and storage problems. And certain box levels might be appropriate for residential use, but not for commercial and/or industrial use.

OBJECTS OF THE INVENTION

It is an object of the invention to provide an improved box level which overcomes some of the problems and shortcomings of the prior art.

Another object of the invention is to provide a sturdy box level with enhanced capability for work surface application.

Another object of the invention is to provide a box level which can be accurately held against a wide work surface of widely varying dimensions.

Another object of the invention is to provide an improved box level that is will retain excellent work surface application for the life of the level, despite long use and considerable abuse.

Still another object of the invention is to provide an improved box level with excellent work surface application with respect to work surfaces of widely varying dimensions.

How these and other objects are accomplished will become apparent from the following descriptions and the drawings.

SUMMARY OF THE INVENTION

The improved box level of this invention is of the type including: an elongate body that defines vial openings, spaced hand-hold openings, opposed first and second face planes, plumb and level vials secured in the vial openings; and hand-holds secured in the hand-hold openings, the hand-holds having outer edges together defining first and second parallel application planes just beyond the first and second face planes, respectively.

The improved box level of this invention allows for the extension of individual units (box levels) by virtue of the solid aluminum “extender arm” attached to each section (box level). This “extender arm” is machined to such tolerance so when connected, no movement or wobbling occurs. The center section of this invention has an “extender arm” secured to each end of the box level, additional sections (box levels) have one “extender arm” secured to them. The additional sections (box levels) are connected by simply sliding the center section (box level) into the hollow end of each additional section (box level). Furthermore, a locking mechanism prevents the units from separating while being moved. This invention allows the user to build literally whatever length of level desired, and break it down for easy transportation and secure storage.

Furthermore, with the addition of the optional 4-way “extender arm” adaptor, several sections (box levels) can be connected to extend in 90 degree angles, east, west, north and south. This feature will aid floor covering installers, for example, not only to check slope, grade, etc. in large rooms or areas, but also can aid in layout as well.

This improved box level also is manufactured from ⅛ inch thick extruded aluminum tube, and is powder coated for durability. With these significant design changes this very improved box level overcomes certain problems and shortcomings of the prior art, including those described above.

DRAWINGS (9)

Brief Description of Drawings

FIG. 1. Full length view of connected sets of box levels

FIG. 2. Full length view of center section of box level

FIG. 3. Full length view of extension section of Box level “extender arm” mounted on left side of box level

FIG. 4. Close up view of “extender arm” of each section of Box level

FIG. 5. Close up view of plumb and level vials located on each section of Box level

FIG. 6. Close up view of hollow tube of Box level

FIG. 7. Close up view of 4-way “extender arm” adaptor

FIG. 8. Close up view of locking mechanism pins

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

The drawings illustrate improved box level (10). Box level (10), similar in appearance to prior box levels, includes an elongate body (12), which is an aluminum extrusion, a pair (2) of vials, plumb (14A), level (14B), hand-holds (18), solid aluminum “extender arms” (20), with locking mechanisms (22) located in each section of box level.

Elongate body (12) includes first and second face-forming walls (12A) and (12B), respectively. Hand-holds (18) extend between first and second face-forming walls (12A) and (12B) and are configured for firm engagement with each of such walls. As shown in FIG. 1, each hand-hold (18A) is an integral (unitary) member with outwardly projecting flanges formed to facilitate engagement with walls (12A) and (12B) of elongate body (12). Each hand-hold (18) has first and second outer edges (18A) and (18B), respectively. The first outer edges (18A) of the hand-holds (18) define a first work-surface application plane which is just beyond the first face plane mentioned above. Likewise, the second outer edges (18B) of the hand-holds (18) define a second work-surface application plane which is just beyond the second face plane mentioned above. The first and second application planes for work surfaces are parallel to one another.

Hand-holds (18) are of rubber-like material. A wide variety of suitable materials can be used, the most suitable material being one which is durable while having a rubber-like surface which resists slippage when Box level (10) is applied to a work surface.

As shown in FIG. 2, the center section of Box level (10) has (2) hand-holds (18) secured in each section; and as shown in FIG. 3, the Box level (10) has (2) hand-holds (18) secured in each section.

As shown in FIG. 2, the center section of Box level (10) has two hand-holds (18) secured in each section; a pair (2) of vials, plumb (14A), level (14B); (2) solid aluminum “extender arms” (20) secured on each end of Box level (10); each “extender arm” (20) has (2) 1 and ¼ inch holes (22) drilled through body to accept locking pins (30) as shown in FIG. 8; elongate body (12) includes first and second face-forming walls (12A) and (12B) respectively.

As shown in FIG. 1, the drawing shows one center section of Box level (10) and three extension sections of Box level (10). This drawing depicts approximately 20 lineal feet of combined sections of improved Box level (10), and additional sections can be connected for whatever length desired.

As shown in FIG. 3, the extension section of Box level (10) has one hand-hold (18) secured in each section; a pair (2) of vials, plumb (14A), level (14B); one solid aluminum “extender arm” (20) secured on one end (either side, left or right); each “extender arm” (20) has two ¼ inch holes (22) drilled through body to accept locking pins (30) as shown in FIG. 8; elongate body (12) includes first and second face-forming walls (12A) and (12B) respectively.

As shown in FIG. 4, this is a close-up view of the solid aluminum “extender arm” (20) secured to each end (or one end) of Box level (10); each “extender arm” (20) has two ¼ inch holes (22) drilled through body to accept locking pins (30) as shown in FIG. 8; when each section is connected simply by sliding hollow end (32) of Box level (10) (as shown in FIG. 6) over “extender arm” (20) two pre-drilled holes ¼ inch wide (36) (as shown in FIG. 6) will line up precisely with two ¼ inch holes (22) drilled through body of “extender arm” (20) to accept locking pins (30) as shown in FIG. 8; once connected and locking pins (30) are inserted, individual sections of Box level (10) will not pull apart, not only for safety concerns but allows movement of several sections without separation of units.

As shown in FIG. 5, this is a close-up view of a pair (2) of vials, plumb (14A), level (14B); the drawing defining vial openings and vials secured in the vial openings.

As shown in FIG. 7, this is a close-up view of the 4-way solid aluminum “extender arm” (20) adaptor that when connected to various sections of Box level (10), will extend the instrument in 90 degree angles, East, West, North, South. Like the solid aluminum “extender arm” (20), it is machined to such a tolerance that when inserted into the improved Box level (10), it fits tight and does not wobble.

While the principles of this invention have been shown and described in connection with specific embodiments, it is to be understood that such embodiments are by way of example and are not limiting.

Claims

1. A box level comprising: an elongate body have a first wall and a second wall extending between opposite ends, the walls forming opposed first and second face planes and defining vial openings; various hand-hold openings at each end; plumb and level vials secured in the vial openings; hand-holds secured in the hand-hold openings; the hand-holds having outer edges together defining first and second parallel application planes just beyond the first and second face planes; the hand-holds having an interior surface defining a first outer flange, a first inner flange, a second outer flange, and a second inner flange, the first outer and inner flanges forming a first channel for receiving the first wall, the second outer and inner flanges forming a second channel for receiving the second wall; each section of box level has installed in one or both ends a solid “extender arm” which allows for each section of box level to be connected to another box level, and when connected, a locking mechanism prevents separation of units while being moved; furthermore, a 4-way “extender arm” adaptor allows for the extension of each box level in 4 directions at a 90* angle, primarily East, West, North, South.

2. The box level of claim 1 wherein the hand-holds are of rubber-like material.

3. The box level of claim 1 wherein the elongate body is an aluminum extrusion, of ⅛″ inch in thickness.

4. The box level of claim 1 wherein the solid “extender arm” is aluminum.

5. The box level of claim 1 wherein each section of box level can be manufactured in various lengths, from 4 ln. ft. sections to 20 ln. ft. sections.

6. The box level of claim 1 wherein plumb and level vials of various accuracy, dimension, and type are available upon special request.

7. The box level of claim 1 wherein the solid 4-way “extender arm” is aluminum.

8. The box level of claim 1 wherein is powder coated for easy clean-up and durability.