Patent US4085661A successfully refreshed from Google Patents.
US4085661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double wedge-lock cylinder head
Assignee: Individual
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Filing: 1976-07-16
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Granted: 1978-04-25
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Expires: 1996-07-16
Abstract
Abstract An hydraulic cylinder head is disclosed having a plurality of arcuate locking segments which engage a plurality of closely spaced circular grooves of approximately trapezoidal transverse cross-section in the internal wall of the cylinder and which abut the perimeter of the head to retain it in the cylinder. A truncated conical taper is provided in the internal wall of the cylinder beyond these grooves to aid in the installation of the piston packing.
Inventors
- 👤 William W. Schriever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:25
CPC Classifications
F; F16; F16J; F16J13/00; F16J13/02; F16J13/10; F16J10/00; F16J10/02
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
161 words
An hydraulic cylinder construction comprising a hollow cylinder having an internal wall provided with a plurality of closely spaced circular grooves in the internal wall near an end each to a depth less than one-half the thickness of the cylinder, a head slidably fitted with said cylinder and to the interior of said plurality of grooves, a restraining means to limit further entry of said head into said cylinder, said restraining means being provided by a truncated conical taper in said internal wall to the interior of said plurality of grooves, a portion of said head being tapered accordingly to provide an abutting surface, a sealing means to prevent leakage of operating fluid between said head and said cylinder, a plurality of arcuate locking segments engaged in said grooves and abutting at least a major portion of the perimeter of the exterior surface of said head, and a retaining means separate from said head to hold said locking segments in place.
Claim 2
Dependent Claim
161 words
An hydraulic cylinder construction comprising a hollow cylinder having an internal wall provided with a plurality of closely spaced circular grooves in the internal wall near an end each to a depth less than one-half the thickness of the cylinder, a head slidably fitted with said cylinder and to the interior of said plurality of grooves, a restraining means to limit further entry of said head into said cylinder, said restraining means being provided by a truncated conical taper in said internal wall to the interior of said plurality of grooves, a portion of said head being tapered accordingly to provide an abutting surface, a sealing means to prevent leakage of operating fluid between said head and said cylinder, a plurality of arcuate locking segments engaged in said grooves and abutting at least a major portion of the perimeter of the exterior surface of said head, and a retaining means separate from said head to hold said locking segments in place.
Claim 3
Dependent Claim
41 words
The hydraulic cylinder construction of claim 1 further comprising an axial bore in said head, a cylindrical actuating rod slidably engaging a portion of said bore, and a packing to prevent leakage of operating fluid between said head and said rod.
Claim 4
Dependent Claim
37 words
The hydraulic cylinder construction of claim 2 further comprising a wiper of pliable elastic material concentrically disposed and interconnectingly fitted to said head to the exterior of said packing and slidably engaging a circumference of said rod.
Claim 5
Dependent Claim
38 words
The hydraulic cylinder construction of claim 2 further comprising a cylindrical bushing of soft metal interconnectingly fitted to said head within a concentric cylindrical recess in said bore and providing the said slidably engaging portion of said bore.
Claim 6
Dependent Claim
37 words
The hydraulic cylinder construction of claim 4 further comprising a lock-ring abutting said bushing and retaining said bushing in place against an abutting shoulder, said lock-ring removably engaging a groove in the inner circumference of said recess.
Claim 7
Dependent Claim
23 words
The hydraulic cylinder construction of claim 4 wherein said packing is retained in an adjacent cylindrical recess in said bore by said bushing.
Claim 8
Dependent Claim
13 words
The hydraulic cylinder construction of claim 2 wherein said packing is a U-cup.
Claim 9
Dependent Claim
49 words
The hydraulic cylinder construction of claim 1 wherein each groove of said plurality of grooves is of an approximately trapezoidal transverse cross-section with each side wall nearer the end of said cylinder provided with a truncated conical taper and with said locking segments tapered accordingly for an interconnecting fit.
Claim 10
Dependent Claim
15 words
The hydraulic cylinder construction of claim 5 wherein said taper measures about 5° from radial.
Claim 11
Dependent Claim
33 words
The hydraulic cylinder head of claim 1 further comprising a bolt passing through a clearance hole in the wall of said cylinder and threaded into a hole in each of said locking segments.
Claim 12
Dependent Claim
23 words
The hydraulic cylinder head of claim 1 wherein said retaining means is a ring removably engaging the inner circumference of said locking segments.
Claim 13
Dependent Claim
36 words
The hydraulic cylinder head of claim 11 wherein said ring is provided with a truncated conical taper on its outer circumference and said locking segments are tapered on their inner circumference accordingly for a tight fit.
Claim 14
Dependent Claim
35 words
The hydraulic cylinder head of claim 11 wherein said ring is made as a coaxial projection from an annular cap removably engaging said cylinder wall as well as the inner circumference of said locking segments.
Claim 15
Dependent Claim
29 words
The hydraulic cylinder head of claim 13 wherein said cap is provided with a lip removably engaging the circumference of a portion of the external wall of said cylinder.
Claim 16
Dependent Claim
32 words
The hydraulic cylinder head of claim 13 wherein said cap is attached to said head with bolts passing through clearance holes in said cap and threaded into blind holes in said head.
Claim 17
Dependent Claim
18 words
The hydraulic cylinder head of claim 15 wherein said bolts are flush with the top of said cap.
Claim 18
Dependent Claim
17 words
The hydraulic cylinder construction of claim 15 wherein said restraining means are said cap and said bolts.
Claim 19
Dependent Claim
63 words
The hydraulic cylinder construction of claim 13 further comprising an axial bore in said head, a cylindrical actuating rod slidably engaging a portion of said bore, a packing to prevent leakage of operating fluid between said head and said rod, and a wiper of pliable elastic material concentrically disposed and interconnectingly fitted to said cap and slidably engaging a circumference of said rod.
Claim 20
Dependent Claim
34 words
The hydraulic cylinder construction of claim 11 further comprising a lock-ring abutting said ring and maintaining said ring in place, said lock-ring removably engaging a groove in the inner circumference of said locking segments.
Claim 21
Dependent Claim
15 words
The hydraulic cylinder construction of claim 11 wherein said retaining means is a metal ring.
Claim 22
Dependent Claim
14 words
The hydraulic cylinder construction of claim 1 wherein said plurality of grooves number two.
Claim 23
Dependent Claim
15 words
The hydraulic cylinder construction of claim 1 wherein said plurality of locking segments number three.
Claim 24
Dependent Claim
17 words
The hydraulic cylinder construction of claim 1 wherein said locking segments are symmetrically spaced around the circumference.
Claim 25
Dependent Claim
15 words
The hydraulic cylinder construction of claim 1 wherein said taper measures about 15° from axial.
Claim 26
Dependent Claim
14 words
The hydraulic cylinder construction of claim 1 wherein said sealing means is an O-ring.
Claim 27
Dependent Claim
20 words
The hydraulic cylinder construction of claim 1 wherein said hollow cylinder, said head, and said arcuate locking segments are metal.
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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |