Protective device for piston rod-cylinder apparatus

Patent metadata

Field	Value
Publication number	US-9347564-B2
Application number	US-201414229125-A
Country	US
Kind code	B2
Filing date	Mar 28, 2014
Priority date	Mar 28, 2013
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A debris wiping device ( 15 ) for a piston rod-cylinder assembly ( 10 ) includes a wiper ring ( 16 ), which surrounds a central opening ( 19 ). The wiper ring ( 16 ) includes a flexible element ( 17 ) that surrounds the central opening ( 19 ). A retaining cap ( 21 ) includes a tubular segment ( 22, 23 ) that transitions at one end into an end wall ( 24 ), which has a through opening ( 25 ).

First claim

The invention claimed is:

1. An apparatus, comprising:
a cylindrical pipe having an outer diameter and first and second axial ends,
a wiping ring having a flexible element that surrounds a central opening, the wiping ring being located on the second axial end of the cylindrical pipe such that that the flexible element is axially spaced from the second axial end, the wiping ring further comprising an annular retaining body attached to the flexible element, wherein a retaining body maximum diameter is greater than a flexible element maximum diameter,
a retaining cap having a tubular segment that transitions at one end into an end wall, wherein the tubular segment of the retaining cap includes:
a first segment that is hollow cylindrical shaped and having a first segment inner diameter, and
a second segment that is conical and is disposed between the first segment and the end wall, the second segment having a portion with a second segment inner diameter that is greater than the first segment inner diameter,

a through-opening being defined in the end wall, the retaining cap is disposed around the second axial end of the cylindrical pipe such that the wiping ring is axially retained and located entirely between the second axial end of the pipe and the end wall such that the end wall is axially spaced from the second axial end of the cylindrical pipe, and
a piston rod slidably disposed through the central opening of the wiping ring, wherein the wiping ring has an outer diameter that is smaller than the outer diameter of the cylindrical pipe.

2. The apparatus according to claim 1 , wherein the flexible element is annular and comprises an elastomer.

3. The apparatus according to claim 2 , wherein the annular retaining body is comprised of a shape-stable, rigid material.

4. The apparatus according to claim 3 , wherein the retaining cap is comprised of a flexible material.

5. The apparatus according to claim 4 , wherein the the first segment inner diameter is larger than an outer diameter of the wiping ring.

6. The apparatus according to claim 5 , wherein the through-opening of the retaining cap has a diameter that is larger than an inner diameter of the central opening of the wiping ring.

7. The apparatus according to claim 6 , wherein the central opening of the wiping ring is conical shaped.

8. The apparatus according to claim 7 , wherein the retaining cap is comprised of soft-PVC.

9. The apparatus according to claim 8 , wherein the second segment inner diameter is greater than an outer diameter of the wiper ring.

10. The apparatus according to claim 9 , wherein the annular retaining body radially surrounds the flexible element.

11. The apparatus according to claim 3 , wherein a retaining body inner diameter is equal to a flexible element inner diameter.

12. The apparatus according to claim 11 , wherein at least a portion of the annular retaining body is located axially between the flexible element and the cylindrical pipe such that the flexible element is axially spaced from the second axial end of the cylindrical pipe.

13. The apparatus according to claim 1 , wherein the retaining cap is comprised of a pliable material.

14. The apparatus according to claim 1 , wherein the second segment inner diameter is larger than an outer diameter of the wiping ring.

15. The apparatus according to claim 1 , wherein the through-opening of the retaining cap has a diameter that is larger than an inner diameter of the central opening of the wiping ring.

16. The apparatus according to claim 1 , wherein the central opening is conical shaped.

Assignees

• Kiecksee Jörg
• Skf Ab

Inventors

• Kiecksee Jörg

Classifications

• F16J15/56 Primary

  Other sealings for reciprocating rods · CPC title

• F16J15/3252

  with rigid casings or supports · CPC title

• F15B15/1461

  Piston rod sealings · CPC title

• F16F9/36

  Special sealings, including sealings or guides for piston-rods ({F16F9/325, F16F9/3485 take precedence; arrangements for filling via piston rod sealing or guiding means F16F9/432} ; sealing of moving parts in general F16J15/16 - F16J15/56) · CPC title

• F16J15/3268 Primary

  Mounting of sealing rings · CPC title