Spiral piston ring with tapered ends and recesses
AssigneeRix Industries
InventorDon S. Slack
Life of this patent
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Abstract
A spiral piston ring made of self-lubricating material and having at least two complete convolutions and having a gradual and continuous taper except for the terminal portions thereof which taper at a steeper angle than the gradual and continuous taper, and with indentations in the convolutions adjacent to the terminal portions which are positioned and which have a size and shape to receive exactly the terminal portions.
Claims4
A spiral piston ring comprising:
- a cylindrical spiral of continuous, elastic, self-lubricating material having a rectangular cross section,
- said spiral having end portions tapered around at least 90.degree. of the angle of rotation of said cylinder, said end portions being tapered at a very acute angle to a plane perpendicular to the axis of rotation of said cylinder,
- each tapered end portion having a tapered terminal portion with the terminal portion being tapered at a less acute angle than said end portion taper with respect to said plane perpendicular to the axis of rotation,
- a recess in a convolution adjacent said terminal portion positioned to receive said terminal portion and having the exact size and shape to receive said terminal portion.
The process for producing a spiral piston ring from a right cylinder of continuous, elastic, self-lubricating material, said right cylinder having end surfaces with each end surface lying in a single plane, with both of said planes parallel to each other and perpendicular to the axis of rotation of said cylinder comprising:
- cutting into one of said end surfaces at an angle with respect to said plane of not greater than 20.degree.
- continuing said cutting for not more than 10.degree. of the angle of rotation of said cylinder, then cutting said cylinder at an angle not greater than 20.degree. with respect to said plane for at least 720.degree. of the angle of rotation of said cylinder, then cutting said cylinder at an angle equal to said first cut angle for a distance equal to the length of said first terminal portion, then cutting said cylinder in a plane perpendicular to said first plane for at least 360.degree. of the angle of rotation of said cylinder.
Dependencies are inferred from the claim text.