Geometrical instruments – Indicator of direction of force traversing natural media – Structurally installed including relation to feature thereof
Patent
1991-12-02
1993-08-17
Will, Thomas B.
Geometrical instruments
Indicator of direction of force traversing natural media
Structurally installed including relation to feature thereof
33382, 33390, 7164, B25F 100
Patent
active
052357554
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an angle finding device and particularly but not exclusively to an angle finding device in the form of a hammer incorporating a spirit level vial whereby for example the hammer can be used to adjust the orientation of a work surface and contemporaneously to check whether that surface is horizontal (or vertical) according to requirements.
BACKGROUND OF THE INVENTION
A combined hammer and levelling device is known in the prior art for example U.S. Pat. No. 1,702,689 and U.S. Pat. No. 3,119,424.
In the former patent a level vial is incorporated in the shaft of a hammer. To enable the hammer to be used as a level, the shaft is held parallel to the workpiece to be level tested by mean of two support points, one being the flat surface of the striking face of the hammer and the other the end of an adjustable support arm attached to the end of the shaft. Consequently the axis of the level vial in the shaft may be arranged such that it is either normal or parallel to a plane containing the end of the support arm when extended and the flat striking face of the hammer, i.e. the plane of the workpiece.
The disadvantage of this design lies in the incorporation of the support arm on the end of the shaft which has to be swung between two positions as between when the device is being used as a hammer and when as a level. This imposes a necessary interference factor on the operator, and time is wasted in switching from one function to another.
SUMMARY OF THE INVENTION
It is an object of the present invention to overcome the disadvantages of the prior art and to provide an angle finding device particularly in the form of an impacting device such as a hammer thus providing a dual purpose implement which does not require to be converted for use in either function.
According to the invention there is provided an angle finding device comprising a body mounting a containment vessel filled with a liquid but including a bubble, the vessel being shaped to provide a path of travel for the bubble therein between successive angular positions thereof corresponding to rotational positions of the body, and scale means provided on or adjacent the vessel for reading the angular position of the bubble and hence of the body.
Preferably the vessel is a circular or part circular hollow ring vial.
The body mounting the vessel may be an ordinary hammer comprising a hammer head with an operating shaft. The peripheral edge of the striking face of the hammer head and the peripheral edge of the end of the shaft are then used as support points for resting against a work surface the orientation of which, normally with respect to the horizontal and vertical, is to be tested.
In a preferred embodiment a circular or part circular ring vial is mounted on the head of the hammer. Two circular ring vials may be provided, one on either side of the hammer head.
Advantageously a straight spirit level vial may be provided across a diameter of the circular vials, the axis of which is arranged at an angle to the axis of the shaft such that a level condition is registered therein corresponding to the desired orientation of the workpiece upon which rests the above support points of the hammer body.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described by way of example with reference to the accompanied drawings wherein:
FIG. 1 is a side view of a combined hammer and levelling device is accordance with the invention;
FIG. 2 is a section through the hammer head on the line X--X shown in FIG. 1;
FIG. 3 is an enlarged side view of one side of the hammer head of the device shown in FIG. 1;
FIG. 4 is a similar view to that of FIG. 3 on the other side of the hammer head; and
FIGS. 5 and 6 illustrate a further embodiment of the invention.
BEST MODES OF CARRYING OUT THE INVENTION
The angle finding device shown in FIG. 1 comprises a hammer having an elongate shaft 1 which is provided with a handle or grip 2, the shaft 1 being formed one piece with the hammer head 3.
The end of the shaft 1 rem
REFERENCES:
patent: 1702689 (1929-02-01), Duemler
patent: 2521525 (1950-09-01), Krausser
patent: 2594543 (1952-04-01), Douglas
patent: 2948067 (1960-08-01), Mistretta
patent: 3119424 (1964-01-01), Henry
patent: 4332046 (1982-06-01), Foley
patent: 4581782 (1986-04-01), Riley
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