SPIRIT LEVEL
First Claim
1. A spirit level comprising a planar base that functions, with the level in a first orientation, as a first level face which rests, in use, on a surface of an item whose level is to be determined, the level being further provided with levelling means comprising first and second vials each filled with a liquid to form a bubble, the longitudinal axis of the first vial being substantially parallel to the plane of the planar base, the longitudinal axis of the second vial being substantially perpendicular to the longitudinal axis of the first vial, optical means being provided to provide an image of one of the vials such that the level of the surface can be determined about two axes, with the planar base resting on the surface of the item whose level is to be determined.
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Accused Products
Abstract
A spirit level comprises a planar base that functions, with the level in a first orientation, as a first level face which rests, in use, on a surface of an item whose level is to be determined. The level is further provided with leveling means comprising first and second vials each filled with a liquid to form a bubble, the longitudinal axis of the first vial being substantially parallel to the plane of the planar base, the longitudinal axis of the second vial being substantially perpendicular to the longitudinal axis of the first vial. Optical means are provided to provide an image of one of the vials such that the level of the surface can be determined about two axes, with the planar base resting on the surface of the item whose level is to be determined.
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Citations
31 Claims
- 1. A spirit level comprising a planar base that functions, with the level in a first orientation, as a first level face which rests, in use, on a surface of an item whose level is to be determined, the level being further provided with levelling means comprising first and second vials each filled with a liquid to form a bubble, the longitudinal axis of the first vial being substantially parallel to the plane of the planar base, the longitudinal axis of the second vial being substantially perpendicular to the longitudinal axis of the first vial, optical means being provided to provide an image of one of the vials such that the level of the surface can be determined about two axes, with the planar base resting on the surface of the item whose level is to be determined.
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30. A spirit level comprising a level face which rests, in use, on a surface of an item whose level is to be determined, the level further comprising levelling means comprising a vial filled with a liquid to form a bubble, the level face being recessed so as to define a first planar portion and a second planar portion the plane of which is perpendicular to the plane of the first planar portion, the planar portions each comprising level faces operative to rest against a surface of an item to be levelled to enable the level of the item to be determined.
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31. A spirit level comprising a planar base that functions as a level face which rests, in use, on a surface of an item whose level is to be determined, the level being further provided with levelling means comprising a vial filled with a liquid to form a bubble, the longitudinal axis of the vial being substantially parallel to the planar base and perpendicular to the longitudinal axis of the level, optical means being provided to provide an image of the vial when the level is viewed in a direction parallel with the longitudinal axis of the vial.
Specification