US3554087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic closing device particularly for injection molding machines
Assignee: Individual
•
Filing: 1968-01-29
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Granted: 1971-01-12
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Expires: 1988-01-29
Abstract
Abstract A hydraulic apparatus for sequentially moving a member by a small force and for forcing said member against a stop by a large force comprises pumps and hydraulic pistons which are mechanically connected to said member. A working piston and a compensating piston which is smaller in cross section than the working piston are mechanically connected to one another and to the member which is to be moved. The associated cylinder chambers are hydraulically connected by an opening, which is adapted to be closed. The cylinder chamber containing the compensating piston communicates through an outlet, which is preferably adapted to be closed, with a chamber in which a pressure exists which is lower than the working pressure.
Inventors
- 👤 Peter Florjancic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:25
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/67; B29C45/6764; B29C45/6771; B22; B22D; B22D17/00; B22D17/20; B22D17/26; F; F15; F15B; F15B15/00; F15B15/20; F15B15/204; Y; Y10; Y10S; Y10S425/00; Y10S425/223
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
190 words
A hydraulic device for the successive moving of a part with a small force and urging this part against a stop with great force, the device comprising: a hydraulic piston; a movable part adapted to be urged against a stop; connecting elements mechanically joining said piston and said movable movable part; said piston having a working side remote from said stop and a compensation side adjacent said stop, the cross section of the working side being greater than the cross section of the compensation side by an amount equal to the cross section of said connection elements; a closable opening passing directly from the working side to the compensation side of the piston through which opening the working side of the piston and the compensating side hydraulically communicate; closure means responsive to the position of said movable part for effecting the closure of said closable opening when the movable part is urged against said stop; and a closable outlet associated with the compensation side of the piston, said outlet being in communication with a space, the pressure of which is lower than that on the working side of said piston.
Claim 2
Dependent Claim
190 words
A hydraulic device for the successive moving of a part with a small force and urging this part against a stop with great force, the device comprising: a hydraulic piston; a movable part adapted to be urged against a stop; connecting elements mechanically joining said piston and said movable movable part; said piston having a working side remote from said stop and a compensation side adjacent said stop, the cross section of the working side being greater than the cross section of the compensation side by an amount equal to the cross section of said connection elements; a closable opening passing directly from the working side to the compensation side of the piston through which opening the working side of the piston and the compensating side hydraulically communicate; closure means responsive to the position of said movable part for effecting the closure of said closable opening when the movable part is urged against said stop; and a closable outlet associated with the compensation side of the piston, said outlet being in communication with a space, the pressure of which is lower than that on the working side of said piston.
Claim 3
Dependent Claim
32 words
The device of claim 1, wherein said closable opening is defined by a slidable cylinder liner communicating with the piston, the slidable liner being positioned on the compensation side of the piston.
Claim 4
Dependent Claim
14 words
The device of claim 1, wherein said closable opening is provided in the piston.
Claim 5
Dependent Claim
27 words
The device of claim 3, wherein the closure member has a progressively decreasing cross section of flow in the closable opening upon the closure of said opening.
Claim 6
Dependent Claim
26 words
The device of claim 1, wherein said closure member is closed in response to a lowering of the pressure on the compensation side of said piston.
Claim 7
Dependent Claim
18 words
The device of claim 1, wherein said closable outlet is adapted to be closed by a magnetic valve.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |