US3603210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic apparatus, preferably closing apparatus for injection molding machines
Assignee: Individual
•
Filing: 1968-09-23
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Granted: 1971-09-07
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Expires: 1988-09-23
Abstract
Abstract A hydraulic apparatus is provided for moving a member under the action of a small force and for subsequently urging the member against a stop under the action of a large force. The operations are carried out with the aid of pumps and hydraulic pistons which are mechanically connected to the member. The apparatus may be used, e.g., in injection molding machines or blowing machines. A double-acting, working and compensating piston is connected to the member to be moved, e.g., to the movable mold-mounting plate. The pressure chambers disposed in the cylinder at both ends of the piston are hydraulically connected to each other by an opening in the piston. The compensating pressure chamber communicates through an outlet with a chamber which is under a pressure that is lower than the working pressure. The outlet is preferably adapted to be closed. A valve member is provided for the opening in the piston. The piston is provided with sealing means in its opening sleeve, which under the hydraulic working pressure cooperates with the valve member to provide a seal between the working and compensating chambers as soon as the compensating chamber is pressure relieved through the outlet. The valve member is adjustable in the stroke direction.
Inventors
- 👤 Peter Florjancic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:00
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/67; B29C45/6764; B29C45/6771; Y; Y10; Y10S; Y10S425/00; Y10S425/223
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
205 words
Hydraulic closure apparatus for molding machines, comprising a cylinder housing having fluid connections for the receipt and discharge of hydraulic fluid and a piston having a continuous connecting opening therethrough mounted in said cylinder housing, said piston being displaceably guided between an initial position and a final position and connected by at least one connecting rod with a part to be moved, said piston dividing the cylinder housing into a working space and a compensation space, and further having end surfaces of different size so that said piston can be acted on by hydraulic fluid on both sides, said hydraulic fluid displacing said piston in the direction towards its end position, where a valve member closes the piston opening at a predetermined place towards its end position, a valve secured to one of said cylinder fluid connections, said valve controlling the passage of the hydraulic fluid through a discharge connection from the cylinder housing, and opened by switching means after the piston opening has been closed, allowing the compensation space to be relieved of pressure while maintaining pressure in the working space, and a longitudinally displaceable packing element cooperating with said valve member when said valve member is arranged in the opening of the piston.
Claim 2
Dependent Claim
205 words
Hydraulic closure apparatus for molding machines, comprising a cylinder housing having fluid connections for the receipt and discharge of hydraulic fluid and a piston having a continuous connecting opening therethrough mounted in said cylinder housing, said piston being displaceably guided between an initial position and a final position and connected by at least one connecting rod with a part to be moved, said piston dividing the cylinder housing into a working space and a compensation space, and further having end surfaces of different size so that said piston can be acted on by hydraulic fluid on both sides, said hydraulic fluid displacing said piston in the direction towards its end position, where a valve member closes the piston opening at a predetermined place towards its end position, a valve secured to one of said cylinder fluid connections, said valve controlling the passage of the hydraulic fluid through a discharge connection from the cylinder housing, and opened by switching means after the piston opening has been closed, allowing the compensation space to be relieved of pressure while maintaining pressure in the working space, and a longitudinally displaceable packing element cooperating with said valve member when said valve member is arranged in the opening of the piston.
Claim 3
Dependent Claim
67 words
Hydraulic apparatus according to claim 1, wherein the packing element is a packing ring which is axially guided in the piston opening and is urged in a direction towards the end position of the piston against a stop by spring means, and the valve member is adjustably mounted in the end of the cylinder housing and has a conical sealing surface which cooperates with said packing ring.
Claim 4
Dependent Claim
78 words
Hydraulic apparatus according to claim 1, wherein thE packing element is a displaceable sleeve in the piston opening, said sleeve having at its ends collars which extend beyond the ends of the piston, said collars serving as stops and in connection with which the valve member is a stuffing box which is secured to a shaft which extends axially into the cylinder housing and is fastened to same in the vicinity of the starting position of the piston.
Claim 5
Dependent Claim
36 words
Hydraulic apparatus according to claim 3, wherein the shaft is displaceable with respect to the cylinder housing between two axial end positions and one of the end positions is adjustable by means of an adjustment screw.
Claim 6
Dependent Claim
16 words
Hydraulic apparatus according to claim 3, wherein the stuffing box is displaceably supported on the shaft.
Claim 7
Dependent Claim
100 words
Hydraulic apparatus according to claim 1, wherein each said connecting rod connecting the piston with the part to be moved is mounted in sealed relationship to said cylinder housing and displaceably passes through said cylinder housing, and in connection with which in the axial extension of each connecting rod is a piston rod fastened to said piston, said piston rod displaceably passing through the working space and the cylinder housing, said piston rod having one end fastened to said piston and the other end having a return piston mounted thereon which lies outside the cylinder housing in a return cylinder.
Claim 8
Dependent Claim
20 words
Hydraulic apparatus according to claim 6, wherein each said piston rod has a smaller diameter than each said connection rod.
References Cited (Backward Citations)
US2805447A
Cited
US3010432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |