US3577596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-phase mold press
Assignee: VIGEANT GASTON
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Filing: 1968-06-26
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Granted: 1971-05-04
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Expires: 1988-06-26
Abstract
Abstract A two-stage power-operated press for closing molds as used in the manufacture of plastic articles by injection molding. The press incorporates a first fluid motor means for advancing and retracting the movable platen at a rapid traverse rate at relatively low pressure and a second fluid motor means for imparting a high-locking pressure to the movable platen at the end of its stroke in order to close the mating mold segments carried by the movable and fixed platens, respectively. The arrangement of the operating parts of the press is such as to achieve maximum platen stroke in order to obtain increased mold opening for accommodating molds for the manufacture of deep-draw articles.
Inventors
- 👤 Calvin P Bullard
- 👤 Francis P Szubelick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:11
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/68; B29C45/681; Y; Y10; Y10S; Y10S425/00; Y10S425/223
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
293 words
In a molding machine of the class described comprising a mold having at least two segments which, when assembled, form a mold cavity, the combination including a two-stage mold press comprising: a. a supporting frame including: i. means forming a base, ii. a pair of longitudinally spaced, fixed plates extending upwardly from the ends of said base, iii. one of said plates defining a fixed platen adapted to attach one of said mold segments, and iv. a plurality of tie rods extending between said plates to define a guideway; b. a movable platen adapted to attach the other of said mold segments being slidably mounted on said tie rods in said guideway for movement between a retracted position and an extended position, the latter placing said mold segments in registry with one another; c. toggle mechanism operably connected between the other of said fixed plates and said movable platen including: i. first link means connected at one end to said other fixed plate and at its other end to means forming a knuckle, ii. second link means connected at one end to said movable platen and at its other end to said knuckle forming means, iii. the connections of the respective link means to said other plate and to said movable platen being spacedly interrelated for overlapping said connections and said link means when said movable platen is in its retracted position; d. first fluid motor means connecTed between said frame and said movable platen for reciprocably moving said movable platen between its retracted and extended positions; and e. second fluid motor means operably connected to the knuckle forming means of said toggle mechanism for imparting a highintensity clamping pressure between said mold segments when said movable platen is in its extended position.
Claim 2
Dependent Claim
293 words
In a molding machine of the class described comprising a mold having at least two segments which, when assembled, form a mold cavity, the combination including a two-stage mold press comprising: a. a supporting frame including: i. means forming a base, ii. a pair of longitudinally spaced, fixed plates extending upwardly from the ends of said base, iii. one of said plates defining a fixed platen adapted to attach one of said mold segments, and iv. a plurality of tie rods extending between said plates to define a guideway; b. a movable platen adapted to attach the other of said mold segments being slidably mounted on said tie rods in said guideway for movement between a retracted position and an extended position, the latter placing said mold segments in registry with one another; c. toggle mechanism operably connected between the other of said fixed plates and said movable platen including: i. first link means connected at one end to said other fixed plate and at its other end to means forming a knuckle, ii. second link means connected at one end to said movable platen and at its other end to said knuckle forming means, iii. the connections of the respective link means to said other plate and to said movable platen being spacedly interrelated for overlapping said connections and said link means when said movable platen is in its retracted position; d. first fluid motor means connecTed between said frame and said movable platen for reciprocably moving said movable platen between its retracted and extended positions; and e. second fluid motor means operably connected to the knuckle forming means of said toggle mechanism for imparting a highintensity clamping pressure between said mold segments when said movable platen is in its extended position.
Claim 3
Dependent Claim
39 words
Apparatus as recited in claim 1 wherein said first fluid motor means comprise a pair of simultaneously actuated piston-cylinder sets connected between said other end plate and said movable platen on opposite sides thereof and externally of said guideway.
Claim 4
Dependent Claim
94 words
Apparatus as recited in claim 2 wherein said piston-cylinder sets each comprise: a. a cylinder of relatively small cross-sectional area mounted to the side edge of said end plate with its open end closely adjacent the inner surface of said end plate; b. a piston operable in said cylinder and including a piston rod extending from the open end of said cylinder and attaching said movable platen; and c. means for supplying motive fluid to said cylinder on alternate sides of said piston for reciprocating said movable platen between its retracted and extended positions.
Claim 5
Dependent Claim
70 words
Apparatus as recited in claim 3 wherein said second fluid motor means comprises a piston-cylinder set of greater cross-sectional area than the piston-cylinder sets of said first fluid motor means and adapted for connection to a higher pressure source of motive fluid than that operating said first fluid motor means for imparting a high fluid force to said toggle mechanism to produce a high-intensity clamping force between said mold segments.
Claim 6
Dependent Claim
117 words
Apparatus as recited in claim 4 including motive fluid supply control means including: a. means for supplying low-pressure motive fluid to the cylinder of said first fluid motor means to advance the pistons operable therein for moving said movable platen to its extended position; b. means for simultaneously supplying low-pressure-motive fluid to the cylinder of said second fluid motor means to maintain said cylinder constantly filled as it is extended by movement of said movable platen; and c. means for terminating the supply of low-pressure fluid to said first and second fluid motor means for supplying high-pressure-motive fluid to the cylinder of said second fluid motor means when said mold segments are in registry with one another.
Claim 7
Dependent Claim
154 words
Apparatus as recited in claim 4 wherein: a. said toggle mechanism comprises oppositely spaced toggle means each including: i. oppositely acting toggle link means pivotally attached by a connecting pin at one of the ends to each other, one of said toggle link means being pivotally connected at its other end to said movable platen and the other toggle link means having its other end pivotally connected to said end plate, ii. a linearly movable crosshead, iii. operating arms pivotally connected at their respective ends to said crosshead and to said connecting pins for operating said toggle means in opposite directions, and b. said second fluid motor means comprises: i. a cylinder having its open end attached to the rear side of said end plate, ii. a piston operable in said cylinder, iii. a piston rod extending from said piston, through said end plate and connecting said crosshead for imparting linear reciprocating movement thereto.
Claim 8
Dependent Claim
110 words
Apparatus as recited in claim 4 wherein said toggle mechanism includes one link means comprising a single link substantially centrally disposed between said tie rods, one end of said single link being pivotally connected to a bracket adapted to receive said link and its other end forming a knuckle sleeve and the other link means comprising a pair of oppositely spaced links having one of their ends pivotally connecting said knuckle sleeve and their other ends pivotally connected to brackets oppositely spaced a distance greater than the width of said single link-connecting bracket whEreby said link means will assume an overlapped condition with said movable platen in its retracted position.
Claim 9
Dependent Claim
33 words
Apparatus as recited in claim 7 wherein the bracket attaching said one link means is mounted to said end plate and those mounting said other link means are mounted to said movable platen.
Claim 10
Dependent Claim
99 words
Apparatus as recited in claim 8 including means for disposing said second fluid motor means in subtended relation to said knuckle sleeve, said means comprising: a. a platform spaced from said knuckle sleeve, said platform including means for mounting the open end of the cylinder of said second fluid motor means to the underside thereof and an opening for passing the piston rod operative in said cylinder for connection with said knuckle sleeve, and b. pivot arm means connecting said platform between said movable platen and said end plate for parallel movement of said platform with said knuckle sleeve.
Claim 11
Dependent Claim
80 words
Apparatus as recited in claim 9 including means for mounting said one link means to said end plate comprising: a. a captive nut rotatably secured in said end plate; b. a worm operated by said captive nut for axial movement normal to said end plate, said worm attaching the bracket for said one link means at the end thereof, and c. means for rotating said captive nut to adjust the position of said bracket with respect to said end plate.
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |