Abstract:
A housing for a subsurface object locator has a bubble level vial for leveling surfaces using the housing and a scribe tip for marking a surface being probed with the locator.

Description:
CROSS-REFERENCE TO RELATED APPLICATION  
       [0001]    Not applicable. 
     
    
     
       STATEMENT CONCERNING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT  
         [0002]    Not applicable.  
         FIELD OF THE INVENTION  
         [0003]    This invention relates to electronic instruments for detecting a stud or other object behind an opaque surface such as wallboard.  
         BACKGROUND OF THE INVENTION  
         [0004]    Stud seekers for locating the position of wall studs behind wallboard material forming the wall surface are well known. They are used in hanging pictures, drilling holes and the like. The object of the present invention is to provide a housing for a stud seeker with improvements for marking the wall and leveling a picture or other wall hung object.  
         SUMMARY OF THE INVENTION  
         [0005]    The invention provides improvements to a stud seeking housing that is, for example, in the overall shape of the housing disclosed in co-pending, commonly assigned U.S. patent application Ser. No. 09/538,087 filed Mar. 29, 2000. However, a stud seeker housing of the invention also has a bubble level vial attached to it so that one of the long edge surfaces of the housing can be placed against a surface of an object desired to be leveled and the vial used to adjust the orientation of the object. In addition, a housing of the invention may be provided with a scribe tip centrally located on or adjacent to the surface of the housing which is slid along the wall surface being probed and is capable of being used to put a small dent, hole, or scratch line in the surface.  
           [0006]    In a preferred aspect, the bubble vial is provided on the front surface of the stud seeker housing parallel with the long edges of the housing and received in a recess which is molded into the housing. An adhesive may be used to hold the vial in the recess.  
           [0007]    In another preferred aspect, the scribe tip is provided at a top end of the housing and raised slightly above the rear surface of the housing which is slid along the wall being probed. As such, the housing can be rotated about the top edge of the housing to bring the scribe tip into contact with the wall so as to create the mark in the wall.  
           [0008]    The foregoing and other objects and advantages of the invention will appear in the detailed description which follows. In the description, reference is made to the accompanying drawings which illustrate a preferred embodiment of the invention. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0009]    [0009]FIG. 1 is a perspective view of a stud seeker housing incorporating the invention;  
         [0010]    [0010]FIG. 2 is a top plan view of the housing;  
         [0011]    [0011]FIG. 3 is a left side plan view of the housing;  
         [0012]    [0012]FIG. 4 is a right side plan view of the housing;  
         [0013]    [0013]FIG. 5 is a top plan view of the housing;  
         [0014]    [0014]FIG. 6 is a bottom plan view of the housing; and  
         [0015]    [0015]FIG. 7 is a rear plan view of the housing.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0016]    [0016]FIG. 1 illustrates a stud seeker housing  10  of the invention. In overall shape, geometry and circuitry, the stud seeker is the same as that described in U.S. patent application Ser. nos. 09/538,087 and 09/538,088, both filed Mar. 29, 2000, and assigned to the assignee of the present application, the disclosures of which are hereby incorporated by reference. However, the housing  10  differs from the housing disclosed in the aforementioned applications because the housing  10  includes a bubble level vial  12  and a scribe tip  14 .  
         [0017]    Wall structures  16  are molded into the front surface  18  of the housing  10  so as to cradle the bubble level vial  12  in an orientation such that it is parallel with long side surface  20  of the housing  10 . Vial  12  is secured in the structure  16  by any suitable means, for example, an adhesive. Cradle  16  also assures that the vial  12  is parallel with the side  20  to within acceptable limits. Thus, surface  20  can be placed against a surface desired to be leveled, for example, the top edge of a picture frame, and the picture frame leveled by centering the bubble in the vial  12 .  
         [0018]    Housing  10  also differs from the housing disclosed in the aforementioned applications by the fact that it includes the scribe tip  14 . The scribe tip  14  is preferably made of a relatively hard and durable material, for example, metal, and may be insert molded into the pyramidal structure  22  which is molded on the top end surface  24  of the housing  10 . The scribe tip  14  has a sharpened point which is directed toward the wall surface which would be probed by sliding the rear surface  26  along the surface to be probed. The tip  14 , however, is raised above the level of the rear surface  26  so that the tip  14  would not touch the surface being probed while the surface  26  was held flat against the probed surface. However, the housing  10  with its surface  26  held against the probed wall surface can be rotated about edge  28 , which exists between rear surface  26  and top surface  24 , to bring the probe tip  14  into contact with the surface being probed and thereby make a mark in the surface being probed.  
         [0019]    It is also noted that the probe tip  14  is at the lateral center of the housing  10 , as best seen in FIG. 2. In fact, the pyramidal structure  22  is like an extension of the triangular array of indicators  30  which light up as a subsurface object is being approached. As seen in FIG. 2, the pyramidal structure  22  forms a point at the lateral center of the housing  10  which helps a user of the stud seeker identify the edge of a subsurface object, the presence of which is indicated by the indicators  30 .  
         [0020]    A preferred embodiment of a stud seeker housing of the invention has been described in considerable detail. Many modifications and variations to the preferred embodiment described will be apparent to those skilled in the art. Therefore, the invention should not be limited to the embodiment described, but should be defined by the claims which follow.