Level with magnetic device
AssigneeEast Precision Measuring Tools Co., Ltd.
InventorWu Dong Ming
Life of this patent
Estimating the term…
Abstract
A level with magnetic device relates to a measuring instrument. That level includes a case body and a bubble cell on the case body, and it is characterized in that the cross section of the bottom of the case body, being the location of the reference plane, has a profiled shape, and furthermore by this is constituted a profiled slot on the bottom of the case body, a magnet is placed inside the profiled slot on the bottom of said case body, an elastic retaining bracket is pressed on top of the magnet, and the shapes of that elastic retaining bracket and the profiled slot are complementarily matched. That level solves the problem of instability of precision of the contemporary level with magnetic device, and it is widely applicable in the level industry.
Claims12
A level comprising:
- an elongated body defined by a first and a second pair of spaced walls, the first pair of walls extending parallel to a reference plane and the second pair of walls generally normal to the first pair of walls, and wherein an opening is defined in at least one of the walls of the second pair of walls;
- an internal cavity defined by the elongated body;
- an orientation indicating device carried within the internal cavity and aligned with the opening;
- an elongated groove extending along the length of one of the walls of the first pair of walls, wherein the elongated groove extends inwardly toward the internal cavity such that a pair of slots spaced from one another are defined against an interior surface of the wall of the first pair of walls;
- and
- a magnet arrangement positioned in the pair of slots such that the magnet arrangement is spaced from the reference plane adjacent the magnet arrangement by the wall of the first pair of walls.
A level for determining an orientation of a reference plane, comprising:
- an elongated member having an internal cavity and an opening to the internal cavity, the elongated member having a top wall and a bottom wall spaced from and generally parallel to the top wall;
- an orientation indicating member positioned within the internal cavity and viewable through the opening;
- and
- a magnet retained against an inner surface of the bottom wall, wherein the inner surface is adjacent the internal cavity such that the magnet is spaced from the reference plane by the bottom wall when the bottom wall is placed onto the reference plane.
Dependencies are inferred from the claim text.