US3889958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston rod floating wiper
Assignee: Case LLC
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Filing: 1974-04-15
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Granted: 1975-06-17
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Expires: 1994-04-15
Abstract
Abstract A rod wiper for use in a fluid cylinder assembly having a cylinder and a piston rod and a housing member included in the assembly and having an annular opening adjacent the rod. Two wiper ring members are disposed in the annular opening in a nested arrangement, and the radially inner one of the members is movable relative to the other one and it engages the rod for the wiping action. An elastic type of O-ring is disposed between the two ring members and permits the inner ring member to move radially with deflection of the rod and thereby remain snug with the rod and be efficient in its wiping action.
Inventors
- 👤 Milton C Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:37
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/56; F16J15/16; F16J15/32; F16J15/3204; F16J15/3224; Y; Y10; Y10S; Y10S277/00; Y10S277/91
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
273 words
A rod floating wiper assembly comprising a housing member, a piston rod axially movably disposed in said housing member, said housing member having an annular opening encircling said piston rod, a first endless ring member fixedly disposed in said annular opening and being in snug contact with said housing member and encircling said piston rod and having a radially inner circumferential surface radially spaced from said piston rod, a second endless ring member disposed in said annular opening and being nested with said first ring member and being radially spaced from any contact with said first ring member and having a radially outer circumferential surface axially aligned with and radially spaced from said radially inner circumferential surface for radial movement of said second ring member toward and away from said first ring member, one of said ring members having an annular groove faced toward the other of said ring members, an elastomeric O-ring disposed in said annular groove between said ring members and being snug with each thereof for precluding the passage of dirt between and beyond said ring members while permitting relative radial movement therebetween, said second ring member having an inner circumferential surface extending along at least a part of the total axial length of said second rig member and disposed in endless snug contact with said piston rod for precluding the passage of dirt past said inner circumferential surface of said second ring member, and said second ring member being of a rigid material and spaced from said first ring member to move with and remain in endless snug contact with said piston rod upon deflection of said piston rod.
Claim 2
Dependent Claim
273 words
A rod floating wiper assembly comprising a housing member, a piston rod axially movably disposed in said housing member, said housing member having an annular opening encircling said piston rod, a first endless ring member fixedly disposed in said annular opening and being in snug contact with said housing member and encircling said piston rod and having a radially inner circumferential surface radially spaced from said piston rod, a second endless ring member disposed in said annular opening and being nested with said first ring member and being radially spaced from any contact with said first ring member and having a radially outer circumferential surface axially aligned with and radially spaced from said radially inner circumferential surface for radial movement of said second ring member toward and away from said first ring member, one of said ring members having an annular groove faced toward the other of said ring members, an elastomeric O-ring disposed in said annular groove between said ring members and being snug with each thereof for precluding the passage of dirt between and beyond said ring members while permitting relative radial movement therebetween, said second ring member having an inner circumferential surface extending along at least a part of the total axial length of said second rig member and disposed in endless snug contact with said piston rod for precluding the passage of dirt past said inner circumferential surface of said second ring member, and said second ring member being of a rigid material and spaced from said first ring member to move with and remain in endless snug contact with said piston rod upon deflection of said piston rod.
Claim 3
Dependent Claim
45 words
The rod floating wiper asembly as claimed in claim 1, wherein said ring members each have an end wall faced thereon axially of said rod and radially overlapping each other to limit axial movement of said second ring member relative to said first ring member.
Claim 4
Dependent Claim
69 words
The rod floating wiper assembly as claimed in claim 1, wherein said second ring member includes a radially outer projecting portion, and said first ring member and said housing member each have radially extending portions to be in face-to-face relation to each other and spaced apart and with one thereof on each axial side of said radially outer projecting portion for limiting axial movement of said second ring member.
Claim 5
Dependent Claim
54 words
The rod floating wiper assembly as claimed in claim 1, wherein said O-ring is disposed on and between the two spaced apart said circumferential surfaces, and said inner circumferential surface of said second ring member being of a length to extend for only less than the total axial length of said second ring member.
Claim 6
Dependent Claim
55 words
The rod floating wiper assembly as claimed in claim 1, wherein each of said ring members includes a surface extending radially of said rod and being spaced from the other in the direction of the axis of said rod, and said O-ring is disposed on and between said radially extending surfaces of said ring members.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |