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US 3,969,991 AGranted
Rolling diaphragm and rolling diaphragm devices
AssigneeBellofram Corporation
InventorsDonald W. Comstock, Peter B. Marchetti
Life of this patent
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AssigneeBellofram Corporation
InventorsDonald W. Comstock, Peter B. Marchetti
Estimating the term…
A rolling diaphragm not subject to the formation of cusps. The rolling wall of the diaphragm is made up of two regions, one region intended to engage the lateral wall of the piston of the rolling diaphragm device, and another region intended to extend from the lateral wall of the piston of the rolling diaphragm device to the diaphragm clamping region formed by the cylinder body of the rolling diaphragm device. In the first mentioned region the rate of change of diameter along the rolling wall is relatively small, or minimized. The second region is circularly shaped in cross-section. The radius of curvature of the cross-section of that portion is relatively large, so that the rate of change of diameter of the rolling wall in that portion thereof is relatively large.
A rolling diaphragm device including in combination
A substantially hat-shaped rolling diaphragm as a separate structure including a cylinder clamping flange having a radially inner relatively large diameter, a piston clamping flange parallel to said cylinder clamping flange having a radially outer edge of relatively small diameter and a rolling wall extending between said cylinder clamping flange and said radially outer edge of said piston clamping flange wherein said rolling wall (3') includes a first region (3a') immediately adjacent said cylinder clamping flange (1'), the radii of the transverse cross-sections of said first region (3a') decreasing at a relatively rapid rate in axial direction from the plane defined by said cylinder clamping flange (1') toward the plane defined by said piston clamping flange (2'), the radial cross-sections of said first region (3a') of said rolling wall (3') having radii of curvature (R.sub.B) larger than one fourth of the difference between said radially inner diameter (D.sub.C) of said cylinder clamping flange (1') and the diameter (D.sub.P) of said radially outer edge of said piston clamping flange (2'), and wherein said rolling wall (3') includes a second region (3b') relatively remote from said cylinder clamping flange (1'), the radii of the transverse cross-sections of said second region (3b') decreasing at a relatively slow rate in axial direction from the plane defined by said cylinder clamping flange (1') toward the plane defined by said piston clamping flange (2').
Dependencies are inferred from the claim text.