Mask compass

Claim 2

A mask compass mounted on goggles, comprising: a watertight outer casing attached to the outer surface of a glass of the goggles, the casing having a transparent wall facing the glass; a compass box mounted within the outer casing; said compass box including a dial; a compass needle mounted in the box; and optical means mounted in the outer casing for enabling a diver to view the compass needle and dial.

Claim 3

Compass as claimed in claim 1 wherein the optical means includes a converging means for sharply focusing an image of said compass needle and said dial upon an eye of said diver.

Claim 4

Compass as claimed in claim 2 wherein the compass box is mounted within the outer casing by means of a shaft which is in a horizontal position when the diver's face is directed directly downwards.

Claim 5

Compass as claimed in claim 2 wherein the focal distance of the optical means system is sufficiently long to provide a necessary depth of field for the observation of the compass needle and the dial.

Claim 6

Compass as claimed in claim 2 wherein an angle of incidence of light on the converging means is adjustable by tilting said converging means in order to adjust a location of said focused image from said converging means.

Claim 7

Compass as claimed in claim 1 wherein the compass box is mounted on the outer casing by means of a shaft which is in the horizontal position when the diver's face is directed directly downwards.

Claim 8

Compass as claimed in claim 6 wherein the mounting shaft is perpendicular to a shaft journalling the compass needle.

Claim 9

Compass as claimed in claim 7 wherein a straight line passing through the mounting shaft intersects a straight line that passes through the shaft journalling the compass needle.

Claim 10

Compass as claimed in claim 1 wherein the focal distance of the optical means is sufficiently long to provide a necessary depth of field for the observation of the compass needle and the dial.

Claim 11

Compass as claimed in claim 1 wherein, in the optical means, the length of path of light from the compass needle to the eye is adjustable.

Claim 12

The compass as claimed in claim 10, wherein the compass box is adjustably mounted within the outer casing so that the distance between the optical means and the compass box is adjustable.

Claim 13

Compass as claimed in claim 1 wherein the outer casing is cylindrical.

Claim 14

Compass as claimed in claim 12 wherein the longitudinal axis of the cylindrical outer casing is perpendicular to the glass face.

Claim 15

The compass as claimed in claim 12, wherein the cylindrical casing comprises a body cylinder attached by its one end to the goggles and an end cylinder nonrotably but slidably in the direction of the cylinders mounted at the free end of the body cylinder, the compass box being mounted within the end cylinder.

Claim 16

The compass as claimed in claim 14, wherein the body cylinder comprises a ring rotably but nonslidably in the direction of the cylinders mounted on the body cylinder, the ring comprising a threading which fits with a threading on the end cylinder.

Claim 17

The compass as claimed in claim 1, wherein the compass box is pivotably mounted within the outer casing.

Claim 18

The compass as claimed in claim 10, wherein the compass box is weighted so that it tends to remain in a horizontal position.

Claim 19

The compass as claimed in claim 1, wherein said outer casing is placed above an eye of said diver so that said compass does not interfere with a normal forward vision of the diver and said optical means downwardly bends a light ray coming from said optical means to the eye.

Claim 20

The compass as claimed in claim 1, wherein the casing is pivotably attached to the goggles.

Claim 21

A mask compass mounted on goggles, comprising: a watertight outer casing attached to the outer surface of a glass of the goggles, the casing having a transparent wall facing the glass; a compass box mounted within the outer casing; said compass box including a dial; a compass needle mounted in the box; and optical means mounted in the outer casing for enabling the diver to view the compass needle and dial; wherein a gap is provided between the outer casing and the glass in the path of light of the optical means said gap being washed by water.

Claim 22

A mask compass mounted on goggles, comprising: a watertight outer casing attached to the outer surface of a glass of the goggles, the casing having a transparent wall facing the glass; a compass box mounted within the outer casing; said compass box including a dial; a compass needle mounted in the box; and optical means mounted in the outer casing for enabling the diver to view the compass needle and dial; wherein a gap is provided between the outer casing and the glass in the path of light of the optical means said gap being washed by water.

Claim 23

A compass for mounting on goggles, comprising: a watertight outer casing; means for attaching the outer casing to the outer surface of a glass of the goggles; said casing having a transparent wall adapted to face the glass when the compass is mounted to the glass; a compass box mounted within the outer casing; said compass box including a dial; a compass needle mounted in the box; and optical means mounted within the outer casing for enabling the diver to view the compass needle and dial, said optical means arranged within the casing in such a manner that when the compass is mounted to the glass, the optical means is on the outside of the glass of the goggles.

Claim 24

A compass for mounting on goggles, comprising: a watertight outer casing; means for attaching the outer casing to the outer surface of a glass of the goggles; said casing having a transparent wall adapted to face the glass when the compass is mounted to the glass; a compass box mounted within the outer casing; said compass box including a dial; a compass needle mounted in the box; and optical means mounted within the outer casing for enabling the diver to view the compass needle and dial, said optical means arranged within the casing in such a manner that when the compass is mounted to the glass, the optical means is on the outside of the glass of the goggles.