# US 10,865,815 B2 · Screw-threaded working cylinder

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- Number: US 10,865,815 B2
- Document ID: US10865815B2
- Status: Granted
- Kind: B2
- Application number: 16/472,388
- Filed: 2017-12-15
- Published: 2019-11-28
- Granted: 2020-12-15
- Earliest claimed: 2016-12-21
- Assignees: Buemach Engineering International B.V.
- Applicants: BüMach Engineering International B.V.; Josef Bueter
- Inventors: Josef Bueter
- Web page: https://patentgrep.com/patent/US10865815B2

## CPC

- F15B 15/1438: {Cylinder to end cap assemblies}
- F15B 15/14: of the straight-cylinder type
- F16J 10/02: Cylinders designed to receive moving pistons or plungers
- F16J 15/04: without packing between the surfaces, e.g. with ground surfaces, with cutting edge
- F15B 15/1442: {End cap sealings}
- F16J 1/008: {with sealing lips}
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## Abstract

A screw-threaded working cylinder includes a tubular cylinder that an end region. The end region has a first thread. The end region has a tapered wall section and the tapered wall section has an axial annular surface. A closure has a second thread and the closure is screwed by the second thread into the first thread in a final mounting position. The closure has a mating axial annular surface. The axial annular surface and the mating axial annular surface are pressed in a positive fitting contact to one another in the final mounting position for defining a pressure contact surface. The pressure contact surface defines a sealing plane, and a surface pressure in an area of the pressure contact surface that causes a deformation of the tubular cylinder and the closure. The deformation occurs within an elastic limit over a range from zero applied pressure to a maximum permissible pressure by a pressure medium for the working cylinder. A piston unit is accommodated in the tubular cylinder.

## Claims

### Claim 1

A screw-threaded working cylinder, comprising:
a tubular cylinder having an end region, said end region having a first thread, said end region having a tapered wall section, said tapered wall section having an axial annular surface, a wall thickness of said tapered wall section being at most 60% of a wall thickness of said tubular cylinder;
a closure having a second thread, said closure being screwed by said second thread into said first thread in a final mounting position, said closure having a mating axial annular surface;
said axial annular surface and said mating axial annular surface being pressed in a positive fitting contact to one another in the final mounting position for defining a pressure contact surface, said pressure contact surface defining a sealing plane, and a surface pressure in an area of said pressure contact surface causing a deformation of said tubular cylinder and said closure, the deformation occurring within an elastic limit over a range from zero applied pressure to a maximum permissible pressure by a pressure medium for the working cylinder; and
a piston unit being accommodated in said tubular cylinder.

### Claim 2 (depends on 1)

The screw-threaded working cylinder according to claim 1, wherein said closure is provided with a sealing element.