US 4,300,776 AGranted

Sealing assembly for two relatively movable machine parts

AssigneeKrauss-Maffei Aktiengesellschaft

InventorPeter Taubenmann

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Abstract

A packing for a piston-and-cylinder arrangement, especially for a dosing or metering unit for highly-filled reactive synthetic resin components such as a polyol or isocyanate, e.g. for producing polyurethanes, comprises a stack of yieldable rings of V-section with one member at an end of the stack bearing with a planar surface against a planar shoulder of the piston and the ring at the opposite end of the stack engaging a spring ring of V-section which confronts an abutment of the piston. According to the invention, the angle .alpha. between the two shanks of the V of the spring ring, in its unstressed state, is greater than the angle .gamma. between the flanks of the packing ring at this end of the stack which define the V of this packing ring. The arrangement is such that under stress the angle .alpha. can be reduced to a value less than the angle .gamma..

Claims7

Dependent claims

A packing assembly for sealing two relatively movable machine elements against one another as a first of said elements moves toward a fluid compartment under pressure in a forward direction and can be retracted in an opposite direction, said packing assembly comprising:

an abutment formed on one of said elements remote from said compartment;
a stack of packing members braced at one end against said abutment and having V-section portions turned toward said compartment and defined by flanks diverging at angle .gamma.;
a spring element of V-shaped cross section engaging the flank of a member of said stack proximal to said compartment and having a flank angle .alpha.;
and
a counter-surface supporting said spring element against said stack, said angle .alpha. being greater than the angle .gamma. in a relaxed condition of said spring element and said counter-surface being shaped to permit deflection of flanks of said spring element to reduce the flank angle thereof to a value less than .gamma. upon stressing of said stack.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/210,288Filed 25 Nov 1980
Priority: DE 294972311 Dec 1979
Granted: 17 Nov 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F16J 15/186
With continuous adjustment of the compression of the packing: using springs
B29B 7/603
For feeding, e.g. end guides for the incoming material: in measured doses, e.g. proportioning of several materials
F04B 53/143
Pistons, piston-rods or piston-rod connections: sealing provided on the piston
F16J 15/164
Between relatively-moving surfaces: the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid