Plumb light

• US 3,909,952 A
• Filed: 04/29/1974
• Issued: 10/07/1975
• Est. Priority Date: 04/29/1974
• Status: Expired due to Term

• Current Assignee: Guy Lagasse
• Original Assignee: Guy Lagasse
• Inventors: Lagasse, Guy
• Primary Examiner(s): Aegerter, Richard E.
• Assistant Examiner(s): Stephan, Steven L.
• Application Number:
  US05/465,320
• Time in Patent Office: 526 Days
• Field of Search: 33/227,286,299,189,283,292
• US Class Current: 33/227
• CPC Class Codes: G01C 15/105 Optical plumbing

Abstract

A plumb light is provided which is operable for establishing the position of a point, the location of which is unknown, through the use of light when the location of another point is known. The plumb light comprises a frame, light means, mounting means for the light means supportable on the frame, and index means. The frame consists of a planar member having a multiplicity of legs extending outwardly therefrom at preselected angles relative to the major axis of the planar member and means formed in the planar member operable for adjustably supporting the mounting means thereon. Each of the legs is provided with adjustment means operable for adjusting the level of the planar member relative to a supporting floor surface. The mounting means which functions as a support for the light means includes first means operable to permit 360* adjustment of the light means about a vertical axis and second means operable to permit the major axis of the light means to be selectively positioned at angles between 0* to 90* relative to the plane of the planar member of the frame. The light means includes means operable for projecting the image of a cross hair on a surface so that the center of the cross hair serves to locate the position of the unknown point sought to be established. The index means which is supportable on the mounting means is employed as an indicator to mark the location of the known point.

Claims

1. A plumb device operable, where one of a pair of points is located on one surface and the other of the pair of points is located on another surface and wherein the location of one of the pair of points is known and the location of the other of the pair of points is unknown, for establishing the location of the unknown point through the use of light comprising:

a. a frame including a planar portion having an elongated slot formed therein extending substantially the entire length thereof and leg means connected to said planar portion operable for supporting the plumb device on a floor-like surface;

b. mounting means including a base member, a rotatable member and a pivotable member, said base member including a pair of leg portions extending in parallel relation to each other and a medial portion interconnecting said pair of leg portions substantially at the mid point thereof to form a pair of slots extending between said pair of leg portions and located on either side of said medial portion thereby providing said base member with a generally H-shaped configuration, said base member being mounted on said planar portion of said frame for sliding movement relative thereto with said medial portion of said base member received within said elongated slot of said planar portion of said frame and with one of said pair of leg portions of said base member located in juxtaposed relation to said planar portion on one side thereof and with the other of said pair of leg portions of said base member located in juxtaposed relation to said planar portion on the other side thereof, said rotatable member being mounted on said base member for rotation through 360* about a vertical axis passing through the center of said rotatable member, said pivotable member being pivotably supported on said rotatable member for selectively positioning said pivotable member relative to said rotatable member at any angle between 0* and 90* measured relative to said vertical axis passing through the center of said rotatable member;

c. index means supported on said base member in depending relation therefrom operable for marking on one surface the position of one of the pair of points; and

d. light means mounted on said pivotable member for movement therewith, said light means including a light producing source operable for producing a beam of light and a cross hair positioned in the path of the beam of light produced by said light producing source so that an image of said cross hair is projected on another surface with the center of the projected image of said cross hair marking the location of the other of the pair of points.

2. The plumb device as set forth in claim 1 wherein said frame further includes level indicating means mounted thereon, said leg means comprises three legs formed integrally with said planar portion of said frame and extending outwardly therefrom at different angles relative thereto, and each of said three legs includes adjustment means operable for adjusting the level of said frame relative to the floor-like surface on which said frame is supported.

3. The plumb device as set forth in claim 1 wherein said light means is mounted on said pivotable member of said mounting means for movement therewith.

4. The plumb device as set forth in claim 1 wherein said index means is resiliently mounted on said base member and includes a cylindrical member having an enlarged head formed at one end thereof cooperable with said base member for supporting said cylindrical member thereon and a cutout formed at the other end of said cylindrical member operable for marking the location of a point on a surface.

5. The plumb device as set forth in claim 1 wherein said index means is resiliently mounted on said base member and includes a cylindrical member having an enlarged head formed at one end thereof cooperable with said base member for supporting said cylindrical member thereon and a pointed tip formed at the other end of said cylindrical member operable for marking the location of a point on a surface.

6. The plumb device as set forth in claim 1 wherein said mounting means further includes first locking means operable for locking said base member against movement relative to said planar portion of said frame selectively in any one of a multiplicity of different locations thereon.

7. The plumb device as set forth in claim 6 wherein said mounting means further includes second locking means operable for locking said pivotable member against movement relative to said rotatable member selectively at any one of a multiplicity of different angles relative thereto.