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The pressure gauge spring is a responsive and easy to manufacture gauge for connection to a pressure source. The spring assembly comprises a coiled hollow tube having a first end and a second end with a body portion therebetween, the hollow tube adapted to produce a displacement of the second end in

The pressure gauge spring is a responsive and easy to manufacture gauge for connection to a pressure source. The spring assembly comprises a coiled hollow tube having a first end and a second end with a body portion therebetween, the hollow tube adapted to produce a displacement of the second end in response to a change in said pressure source to which said first end is connected. The second end of the body portion is sealed. The body portion of the spring assembly has a first longitudinal portion and a second longitudinal portion extending from proximate to said first longitudinal portion to said second end and substantially uniformly compressed along the second longitudinal portion to reduce volume thereby. A transition area is disposed between said first end and said first longitudinal portion of said hollow tube, and is compressed so as to form a continuous longitudinally extending ridge along said transition area.

대표청구항 ▼

1. A spring assembly for a pressure gauge for connection to a pressure source, the spring assembly comprising:a coiled hollow tube having a first end and a second end with a body portion therebetween, the hollow tube adapted to produce a displacement of the second end in response to a change in the

1. A spring assembly for a pressure gauge for connection to a pressure source, the spring assembly comprising:a coiled hollow tube having a first end and a second end with a body portion therebetween, the hollow tube adapted to produce a displacement of the second end in response to a change in the pressure source to which the first end is connected;the body portion having a substantially cylindrical portion extending from proximate the first end, a first longitudinal portion, and a second longitudinal portion extending from proximate the first longitudinal portion to the second end, the second longitudinal portion substantially uniformly compressed to reduce volume thereby;a transition area defined by the region between the substantially cylindrical portion and the first longitudinal portion of the hollow tube, the transition area being compressed so as to form a continuous longitudinally extending ridge along the transition area; andwherein the second end of the body portion is sealed. 2. The spring assembly according to claim 1, wherein the continuous longitudinally extending ridge extends into the first longitudinal portion. 3. The spring according to claim 1, wherein the first longitudinal portion of the body portion is compressed so as to form a continuous longitudinally extending ridge along the first longitudinal portion. 4. The spring assembly according to claim 1 further comprising an indicator pointer attached to said second end of said body portion. 5. The spring assembly according to claim 1 further comprising a calibrated pressure gauge. 6. The spring assembly according to claim 5 wherein said acid wash comprises 25 percent phosphoric acid and 75 percent water. 7. The spring assembly according to claim 6 wherein said spring assembly is heat treated at temperature between 600 and 800 degrees Fahrenheit for a time between 1 and 3 hours. 8. The spring assembly according to claim 1 wherein said spring assembly is treated with an acid wash. 9. The spring assembly according to claim 1 wherein said spring assembly is heat treated. 10. A spring assembly for a pressure gauge for connection to a pressure source, the spring assembly comprising:a coiled hollow tube having a first end and a second end with a body portion therebetween, the hollow tube adapted to produce a displacement of the second end in response to a change in the pressure source to which the first end is connected;the body portion having a substantially cylindrical portion extending from proximate the first end, a first longitudinal portion, and a second longitudinal portion extending from proximate the first longitudinal portion to the second end, wherein the region between the cylindrical portion and the first longitudinal portion is compressed to form a continuous longitudinally extending ridge, and the second longitudinal portion substantially uniformly compressed to reduce volume thereby;wherein the second end of the body portion is sealed. 11. The spring assembly according to claim 10, wherein the first longitudinal portion of the body portion is compressed so as to form a continuous longitudinally extending ridge along the first longitudinal portion.