US3663140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic arrangement for injection-molding apparatus
Assignee: Individual
•
Filing: 1969-04-29
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Granted: 1972-05-16
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Expires: 1989-04-29
Abstract
Abstract Injection-molding apparatus in which a mold means of two parts is moved between open and closed positions. The molding means is moved by a first hydraulic means. A second hydraulic means is also operatively associated with the mold means and together with the first hydraulic means forms a single operating unit; such second hydraulic means being for applying a greater force to the mold means to hold it in its closed position than is capable of being applied by the first hydraulic means. Means are also provided for rendering the second hydraulic means inoperative during operation of the first hydraulic means.
Inventors
- 👤 Karl Hehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:17
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/67; B29C45/6764; B29C45/6771
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
308 words
In an injection-molding apparatus for processing synthetics, the combination which comprises: a. mold means having two parts for receiving injections of synthetic materials, with one of said parts being movable and the other of said parts being stationary, so that said mold means is movable between open and closed positions; b. first hydraulic means operatively associated with said mold means for moving the same between said closed and open positions, said first hydraulic means including a piston and a cylinder; c. second hydraulic means also operatively associated with said mold means and forming one operating unit with said first hydraulic means for applying to said mold means a force which is greater than that capable of being applied by said first hydraulic means, to hold said mold means in its closed position, said second hydraulic means including a piston, a piston rod connected to said piston, a clamping plate connected to said movable part and directly and rigidly connected to said piston rod, and a cylinder, said piston rod partly supporting said clamping plate, said second hydraulic means pulling said movable mold part toward said stationary mold part; and d. means interconnected with said first and second hydraulic means for rendering said second hydraulic means inoperative during operation of said first hydraulic means, said interconnecting means including at least one channel, said cylinder of said second hydraulic means defining a chamber on each side of said piston of said second hydraulic means, said piston of said second hydraulic means being connected by connecting means to said piston of said first hydraulic means, said channel connecting the chambers on each side of said piston of said second hydraulic means, with valve means disposed within said channel to unblock said channel whenever said first hydraulic means is operated, and to block said channel whenever said second hydraulic means is operated.
Claim 2
Dependent Claim
308 words
In an injection-molding apparatus for processing synthetics, the combination which comprises: a. mold means having two parts for receiving injections of synthetic materials, with one of said parts being movable and the other of said parts being stationary, so that said mold means is movable between open and closed positions; b. first hydraulic means operatively associated with said mold means for moving the same between said closed and open positions, said first hydraulic means including a piston and a cylinder; c. second hydraulic means also operatively associated with said mold means and forming one operating unit with said first hydraulic means for applying to said mold means a force which is greater than that capable of being applied by said first hydraulic means, to hold said mold means in its closed position, said second hydraulic means including a piston, a piston rod connected to said piston, a clamping plate connected to said movable part and directly and rigidly connected to said piston rod, and a cylinder, said piston rod partly supporting said clamping plate, said second hydraulic means pulling said movable mold part toward said stationary mold part; and d. means interconnected with said first and second hydraulic means for rendering said second hydraulic means inoperative during operation of said first hydraulic means, said interconnecting means including at least one channel, said cylinder of said second hydraulic means defining a chamber on each side of said piston of said second hydraulic means, said piston of said second hydraulic means being connected by connecting means to said piston of said first hydraulic means, said channel connecting the chambers on each side of said piston of said second hydraulic means, with valve means disposed within said channel to unblock said channel whenever said first hydraulic means is operated, and to block said channel whenever said second hydraulic means is operated.
Claim 3
Dependent Claim
47 words
Apparatus as defined in claim 1 wherein said channel is defined in said piston of said second hydraulic means and wherein said valve means is concentrically disposed within the piston of said second hydraulic means and permanently connected to said piston rod of said second hydraulic means.
Claim 4
Dependent Claim
19 words
Apparatus as defined in claim 2, wherein said valve meanS is controlled, at least in part, by hydraulic means.
Claim 5
Dependent Claim
15 words
Apparatus as defined in claim 2, wherein said valve means is controlled by hydraulic means.
Claim 6
Dependent Claim
74 words
Apparatus as defined in claim 4, wherein said valve means includes a body member, said channel connecting said chambers of said second hydraulic means extends through said piston of said second hydraulic means and an appropriately shaped seat is provided within said piston of said second hydraulic means at a location along said channel for receiving said valve body member, said valve body member being shaped to correspond to the shape of said seat.
Claim 7
Dependent Claim
83 words
Apparatus as defined in claim 5, wherein said seat is conically shaped and said valve body member includes a surface facing said seat which is also conically shaped, and defined within said piston of said second hydraulic means is a portion of said channel in surrounding relationship to a segment of said piston rod of said second hydraulic means and a portion of said channel which is connected to said surrounding channel portion and inclined with respect to the axis of said valve.
Claim 8
Dependent Claim
16 words
Apparatus as defined in claim 8 wherein a plurality of said inclined channel portions are provided.
Claim 9
Dependent Claim
70 words
Apparatus as defined in claim 5, wherein an annular chamber is provided along said channel within said piston of said second hydraulic means, said valve body member is cylindrically shaped and, at least partially, disposed in said annular chamber, and a radially extending flange is provided on said valve body member which is arranged with respect to said channel to block and unblock the same during operation of the apparatus.
Claim 10
Dependent Claim
25 words
Apparatus as defined in claim 5 wherein said piston of said second hydraulic means is directly connected to said piston of said first hydraulic means.
Claim 11
Dependent Claim
137 words
Apparatus as defined in claim 1 wherein said piston and cylinder of said first hydraulic means is permanently attached to said piston and cylinder of said second hydraulic means in longitudinally extending serial arrangement, said piston of said first hydraulic means extending from said piston of said second hydraulic means and said cylinder of said first hydraulic means extending from said cylinder of said second hydraulic means; a fixed tube-like projection extending inwardly into said cylinder of said first hydraulic means from the end thereof opposite to where said piston of said first hydraulic means extends from said piston of said second hydraulic means and said fixed tube-like projection being in communication with the outside of said cylinder of said first hydraulic means, said piston of said first hydraulic means being disposed around said fixed tube-like projection.
Claim 12
Dependent Claim
21 words
Apparatus as defined in claim 1 wherein a plurality of said second hydraulic means is provided in a single cylinder block.
Claim 13
Dependent Claim
54 words
Apparatus as defined in claim 1, wherein said cylinder of said first hydraulic means is disposed on the same side of said cylinder block as said clamping plate, said cylinder of said first hydraulic means being attached at one end to said cylinder block and connected at the other end to said clamping plate.
Claim 14
Dependent Claim
29 words
Apparatus as defined in claim 11 wherein a plurality of said first hydraulic means are provided in the same cylinder block as said plurality of said second hydraulic means.
Claim 15
Dependent Claim
154 words
Apparatus as defined in claim 2, wherein said piston rod of said second hydraulic means extends partially within said piston of said second hydraulic means and is arranged for limited movement relative thereto, said piston of said second hydraulic means is located on one side of said mold means and the side of said second hydraulic means remote from said mold means includes a cylindrical bore concentrically disposed therein a control piston is disposed for movement in said cylindrical bore, and wherein said valve means in said piston of said second hydraulic means is disposed in said cylindrical bore and inter-connectingly positioned between said piston rod of said second hydraulic means and said control piSton, said control piston, hence said piston rod of said second hydraulic means, being moved by pressures built up in the piston chamber of said second hydraulic means adjacent said remote side of said piston of said second hydraulic means.
Claim 16
Dependent Claim
70 words
Apparatus as defined in claim 14, wherein the side of said piston of said second hydraulic means which faces toward said mold means has a greater area than the side of said piston of said second hydraulic means remote therefrom, the difference in the areas of the two sides being at least equal to the area of the side of the control piston which is remote from said mold means.
Claim 17
Dependent Claim
59 words
Apparatus as defined in claim 14, wherein a stop element is disposed in said cylindrical bore and the control piston abuts against said stop element when said channel is unblocked by said valve means and the relative movement between the piston and the piston rod of said second hydraulic means is limited in one direction by said stop element.
Claim 18
Dependent Claim
65 words
Apparatus as defined in claim 16, wherein a chamber is formed in said cylindrical bore with the side of said control piston which faces toward said mold means limiting one end of said chamber and wherein an oil line is defined in said piston rod said second hydraulic means and said valve means which opens into said chamber thereby to deliver thereto oil under pressure.
Claim 19
Dependent Claim
48 words
Apparatus as defined in claim 16, wherein a spring is provided having one end in contact with said remote side of the piston of said second hydraulic means thereby to press said piston away from said valve to unblock said channel during operation of said first hydraulic means.
Claim 20
Dependent Claim
27 words
Apparatus as defined in claim 18, wherein said spring is disposed in said cylindrical bore and the other end of said spring abuts against said control piston.
Claim 21
Dependent Claim
69 words
Apparatus as defined in claim 18, wherein an extended portion of said piston rod of said second hydraulic means is provided through said cylindrical bore and projects beyond said remote side of the piston of said second hydraulic means, wherein an abutment is provided on said extended portion, and wherein said spring is disposed outside said cylindrical bore with one of its ends in abutting engagement with said abutment.
Claim 22
Dependent Claim
17 words
Apparatus as defined in claim 18, wherein said control piston is constructed as a separate structural unit.
Claim 23
Dependent Claim
87 words
Apparatus as defined in claim 18, wherein the size and pretensioning of said spring is such that the pressure it exerts against said piston of said second hydraulic means is less than the pressure exerted by said piston of said second hydraulic means against said spring during operation of said second hydraulic means, this being due to the difference in area between the side of said piston of said second hydraulic means facing toward said mold means and the side of said second hydraulic means remote therefrom.
Claim 24
Dependent Claim
39 words
Apparatus as defined in claim 14 further comprising an oil tank; and wherein the chamber of said second hydraulic means on said remote side of the piston of said second hydraulic means is in communication with said oil tank.
Claim 25
Dependent Claim
51 words
Apparatus as defined in claim 23, wherein a conduit is provided which connects said oil tank to said chamber of said second hydraulic means on the remote side thereof, said conduit having a pressure valve which allows a flow to take place therethrough when a predetermined pressure threshold has been exceeded.
Claim 26
Dependent Claim
14 words
Apparatus as defined in claim 24 further comprising two pumps of different output capacities.
Claim 27
Dependent Claim
67 words
Apparatus as defined in claim 1, wherein said second hydraulic means are supplied with oil from two pumps and wherein said first hydraulic means are completed by a switching bar fastened on the plate carrying the movable mold part and are further completed by an electric circuit controlling said two pumps, said switching bar closes only said electric circuit when the mold parts are completely closed together.
Claim 28
Dependent Claim
48 words
Apparatus as defined in claim 1, wherein said second hydraulic means are supplied witH oil from two pumps, one of which is additionally supplying at subsequent periods said first hydraulic means and additional hydraulic means of an injection unit for injecting the plastic material into the mold means.
Claim 29
Dependent Claim
67 words
An apparatus as defined in claim 1, wherein said cylinders of said first and second hydraulic means are concentrically arranged with respect to each other, wherein the piston of said first hydraulic means is permanently connected to the piston of said second hydraulic means by the piston rod of said first hydraulic means, and wherein said channel is disposed within said piston of said second hydraulic means.
Claim 30
Dependent Claim
55 words
An apparatus as defined in claim 1, wherein said valve means includes a valve, means biasing said valve into a closed position, and means acting to overcome said biasing means to cause said valve to open, said means including a piston and a stem for engaging said valve and fluid means for actuating said piston.
Claim 31
Dependent Claim
54 words
An apparatus as defined in claim 1, wherein said valve of said valve means is biased in one direction and said piston of said valve means is actuated in said one direction, and wherein said direction is substantially normal to the direction of movement of said one of said parts of said mold means.
Claim 32
Dependent Claim
53 words
An apparatus as defined in claim 1, wherein said valve of said valve means is biased in one direction and said piston of said valve means is actuated in said one direction, and wherein said direction substantially coincides with the direction of movement of said one of said parts of said mold means.
Claim 33
Dependent Claim
40 words
An apparatus as defined in claim 11, wherein said cylinders of said first and second hydraulic means are concentrically arranged with respect to each other, and wherein said channel is disposed in a block laterally flanged to said cylinder block.
Claim 34
Dependent Claim
27 words
An apparatus as defined in claim 32, wherein like chambers on each side of said pistons of said plurality of second hydraulic means are interconnected by channels.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |