US2020171587A1PendingUtilityA1

Compact rotary seal

59
Individually held — no corporate assignee on recordPriority: Jun 1, 2016Filed: Feb 3, 2020Published: Jun 4, 2020
Est. expiryJun 1, 2036(~9.9 yrs left)· nominal 20-yr term from priority
Inventors:William J. EndresDouglas J. Woodruff
B23C 2210/506B23C 5/2247B23C 5/06F16C 19/38B23C 5/207F16C 19/545F16C 19/386F16C 19/364F16C 19/361B23C 5/2226F16C 19/548B23C 2260/08F16C 2322/00B23C 5/223B23C 2200/045B23C 5/2221F16J 15/32B23C 2210/165B23C 5/2213B23B 2260/008B23B 2260/126B23B 2260/0085B23B 27/12B23C 5/2462B23B 2200/0461B23B 2260/0087B23B 2200/3618B23C 2260/72F16J 15/3268
59
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Claims

Abstract

This invention relates to simple, compact rotary seals that contract to maintain a seal as the sealing elements may wear over time. Embodiments of this invention allow simple elastic rings, such as an O-ring, to be used as the sealing element.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A rotary seal comprising:
 a. an axis;   b. a primary seal surface having a primary tangent plane making a primary angle with the axis less than 89°;   c. a secondary seal surface having a secondary tangent plane making a secondary angle with the axis greater than the primary angle and less than the primary angle plus 90°; and   d. an elastic ring stretched around the primary seal surface, whereby, through contraction, the elastic ring is predisposed to sliding toward, mating with, and forming a seal against the secondary seal surface.   
     
     
         2 . The rotary seal of  claim 1 , in which the primary angle is greater than the arctangent of the coefficient of friction between the elastic ring and the primary seal surface. 
     
     
         3 . The rotary seal of  claim 1 , in which the elastic ring has a circular cross-section. 
     
     
         4 . The rotary seal of  claim 1 , in which the elastic ring has a square cross-section. 
     
     
         5 . The rotary seal of  claim 1 , in which the elastic ring has a rectangular cross-section. 
     
     
         6 . The rotary seal of  claim 1 , in which the elastic ring has a lobed cross-section. 
     
     
         7 . The rotary seal of  claim 1 , in which the elastic ring has a triangular cross-section.

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