US3604058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding apparatus
Assignee: Individual
•
Filing: 1968-12-11
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Granted: 1971-09-14
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Expires: 1988-12-11
Abstract
Abstract An injection molding apparatus wherein the platen which carries the movable mold section receives locking and sealing pressures by way of a spindle which meshes with a spindle nut. The latter is free to rotate during movement of the platen between open and closed positions but is held against rotation during application of locking and sealing pressures furnished by a piston which is reciprocable in a cylinder of the platen or in a cylinder provided in a stationary support. The spindle is rigid with the platen when the piston is mounted in the support or the spindle is rigid with the piston when the latter is mounted in the platen. The spindle nut rotates in response to rotation of the spindle if the threads of the spindle and spindle nut are not of the self-locking type. If such threads are of the self-locking type, the spindle nut is rotated in response to displacement of the platen or by a separate prime mover.
Inventors
- 👤 Alfred Fischbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:52
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/67; B29C45/6707; B29C45/6714; Y; Y10; Y10S; Y10S425/00; Y10S425/221; Y10S425/223
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
176 words
In an injection molding apparatus, a combination comprising a stationary support; a mold including a pair of mold sections; a platen connected with one of said sections and movable toward and away from said support between open and closed positions in which said sections are respectively spaced from and adjacent to each other; moving means connected to said platen for moving the same between said open and closed positions; and an additional mechanism for applying locking and sealing pressures to said mold in the closed position of said platen, including a spindle member operatively connected with said platen for movement therewith between said open and closed positions, a spindle nut member meshing with said spindle member, one of said members being rotatable with reference to the other member during movement of said platen between open and closed positions, locking means operative to move said platen beyond closed position, and blocking means for holding said one member against rotation during operation of said locking means whereby the platen transmits locking and sealing pressures to said mold sections.
Claim 2
Dependent Claim
176 words
In an injection molding apparatus, a combination comprising a stationary support; a mold including a pair of mold sections; a platen connected with one of said sections and movable toward and away from said support between open and closed positions in which said sections are respectively spaced from and adjacent to each other; moving means connected to said platen for moving the same between said open and closed positions; and an additional mechanism for applying locking and sealing pressures to said mold in the closed position of said platen, including a spindle member operatively connected with said platen for movement therewith between said open and closed positions, a spindle nut member meshing with said spindle member, one of said members being rotatable with reference to the other member during movement of said platen between open and closed positions, locking means operative to move said platen beyond closed position, and blocking means for holding said one member against rotation during operation of said locking means whereby the platen transmits locking and sealing pressures to said mold sections.
Claim 3
Dependent Claim
35 words
A combination as defined in claim 1, wherein said locking means comprises a piston and said support comprises a cylinder which accommodates said platen for axial movement toward and away from the other mold section.
Claim 4
Dependent Claim
33 words
A combination as defined in claim 1, wherein said locking means comprises a piston and said platen comprises a cylinder which accommodates said piston for movement toward and away from said stationary support.
Claim 5
Dependent Claim
65 words
A combination as defined in claim 1, wherein said members are provided with mating threads and wherein said one member is said spindle nut member which is free to rotate in response to movement of said spindle member with said platen between open and closed positions, said blocking means comprising means for holding said spindle nut member against rotation on operation of said locking means.
Claim 6
Dependent Claim
23 words
A combination as defined in claim 4, wherein said blocking means comprises means for coupling said spindle nut member to said stationary support.
Claim 7
Dependent Claim
53 words
A combination as defined in claim 5, wherein said blocking means comprises a sleeve, means for turning said sleeve and for thereby moving said spindle nut member axially, and a blocking element arranged to engage with and to couple said spindle nut member to said support in response to turning of said sleeve.
Claim 8
Dependent Claim
16 words
A combination as defined in claim 6, wherein said sleeve is mounted on said locking means.
Claim 9
Dependent Claim
35 words
A combination as defined in claim 7, wherein said locking means comprises a piston and said stationary support comprises a cylinder reciprocably receiving said piston for movement toward and away from the other mold section.
Claim 10
Dependent Claim
24 words
A combination as defined in claim 6, wherein said blocking element is a cone which is nonrotatably but axially movably mounted in said support.
Claim 11
Dependent Claim
15 words
A combination as defined in claim 6, further compriSing means for turnably supporting said sleeve.
Claim 12
Dependent Claim
63 words
A combination as defined in claim 10, wherein the means for turnably supporting said sleeve comprises a second sleeve having internal threads meshing with external threads provided on said first mentioned sleeve and wherein said turning means is arranged to turn said first mentioned sleeve with reference to said second sleeve whereby said first mentioned sleeve moves axially with said spindle nut member.
Claim 13
Dependent Claim
48 words
A combination as defined in claim 4, wherein said spindle member is rigidly affixed to a central portion of said platen and wherein said locking means comprises a hydraulically operated piston reciprocable in a cylinder provided therefor in said stationary support, said spindle member extending through said piston.
Claim 14
Dependent Claim
94 words
A combination as defined in claim 4, wherein said one member is said spindle nut member and wherein said blocking means comprises a cage, a pair of thrust bearings in said cage, a flange provided on said spindle nut member between said bearings, a sleeve rigid with said cage and movable axially to thereby displace said spindle nut member, and a blocking element arranged to engage with said spindle nut member in response to axial movement of said sleeve and to thereby hold said spindle nut member against rotation with reference to said support.
Claim 15
Dependent Claim
70 words
A combination as defined in claim 13, wherein said blocking means further comprises means for moving said sleeve axially, said last mentioned means comprising an internally threaded second sleeve meshing with said first mentioned sleeve, an arm affixed to said first mentioned sleeve, and a fluid-operated cylinder and piston assembly for rocking said arm to thereby rotate said first-mentioned sleeve in said second sleeve whereby said first-mentioned sleeve moves axially.
Claim 16
Dependent Claim
93 words
A combination as defined in claim 1, wherein said one member is said spindle nut member and wherein said members are provided with self-locking mating threads, said blocking means comprising a pair of stops provided on said support and drive means for rotating said spindle nut member during movement of said platen between open and closed positions whereby said spindle nut member abuts against one of said stops, said spindle nut member being arranged to bear against the other stop and to be thus held against rotation during operation of said locking means.
Claim 17
Dependent Claim
15 words
A combination as defined in claim 15, wherein said one stop comprises a thrust bearing.
Claim 18
Dependent Claim
16 words
A combination as defined in claim 15, wherein said drive means derives motion from said platen.
Claim 19
Dependent Claim
54 words
A combination as defined in claim 17, wherein said drive means comprises a first gear provided on said spindle nut member, a toothed rack coupled to said platen, and a least one additional gear interposed between said rack and said first mentioned gear to rotate the latter in response to movement of said platen.
Claim 20
Dependent Claim
15 words
A combination as defined in claim 15, wherein said drive means comprises a prime mover.
Claim 21
Dependent Claim
43 words
A combination as defined in claim 19, wherein said prime mover comprises a reversible motor which is arranged to change the direction of its rotation in response to a change in the direction of movement of said platen between open and closed positions.
Claim 22
Dependent Claim
23 words
A combination as defined in claim 20, wherein said drive means further comprises a transmission between said motor and said spindle nut member.
Claim 23
Dependent Claim
16 words
A combination as defined in claim 21, wherein said motor is of the rotary field type.
Claim 24
Dependent Claim
43 words
A combination as defined in claim 1, wherein said spindle member is rigid with said locking means and wherein said locking means comprises a piston reciprocable in a hydraulic cylinder provided therefor in one of the parts including said platen and said support.
Claim 25
Dependent Claim
17 words
A combination as defined in claim 1, wherein said moving means comprise fluid-operated cylinder and piston means.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |