US3736092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for transmitting motion to mold sections in injection molding machines
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1971-04-08
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Granted: 1973-05-29
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Expires: 1991-04-08
Abstract
Abstract Clamping apparatus for an injection molding machine wherein a movable platen is reciprocable between a fixed platen and a support for a stationary mold section has at least one pair of toggle links whose outer ends are pivoted to the two platens and whose inner ends are pivoted to each other, at least one pair of levers the outer ends of which are pivoted to the platens and the inner ends of which are pivoted to each other, and a hydraulic motor having a cylinder which is pivotally connected to at least one of the levers and a piston rod pivotally connected to the pin coupling the inner ends of the toggle links. When the movable platen is remote from the support, the toggle links make with each other an angle of less than 90* and the piston rod of the hydraulic motor makes with the tie rods for the movable platen an acute angle which is preferably less than 45*. This insures the generation of a substantial closing force as soon as the movable platen begins to advance toward the support and prevents excessive acceleration or deceleration of the movable platen during movement away from or toward the fixed platen.
Inventors
- 👤 K Konig
- 👤 E Wurl
- 👤 R Herbst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:08
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/68; B29C45/681
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
270 words
In an injection molding machine, the combination of a first platen; elongated guide means extending from said first platen; a second platen movable with reference to said guide means along a first straight line path between a first position nearer to and a second position remote from said first platen; and apparatus for moving said second platen, comprising first and second toggle links making with each other an acute angle in the first position of said second platen and having first ends respectively pivoted to said first and second platens and second ends pivoted to each other to form a first junction, first and second levers having first ends respectively pivoted to said first and second platens and second ends pivoted to each other to form a second junction, said first lever being a bell crank having a concave side facing said second platen and the distance between said first and second ends of said first lever being greater than the distance between said first and second ends of said second lever, and a prime mover including a first portion pivotally connected with said first lever intermediate said first and second ends thereof and with said second junction, said prime mover further includiNg a second portion pivotally connected to said first junction and movable relative to said first portion along a second straight line path which makes an angle of less than 71* with said first path in the first position of said second platen to thereby move said second platen toward said second position by displacing said first junction in a direction to enlarge the angle between said links.
Claim 2
Dependent Claim
270 words
In an injection molding machine, the combination of a first platen; elongated guide means extending from said first platen; a second platen movable with reference to said guide means along a first straight line path between a first position nearer to and a second position remote from said first platen; and apparatus for moving said second platen, comprising first and second toggle links making with each other an acute angle in the first position of said second platen and having first ends respectively pivoted to said first and second platens and second ends pivoted to each other to form a first junction, first and second levers having first ends respectively pivoted to said first and second platens and second ends pivoted to each other to form a second junction, said first lever being a bell crank having a concave side facing said second platen and the distance between said first and second ends of said first lever being greater than the distance between said first and second ends of said second lever, and a prime mover including a first portion pivotally connected with said first lever intermediate said first and second ends thereof and with said second junction, said prime mover further includiNg a second portion pivotally connected to said first junction and movable relative to said first portion along a second straight line path which makes an angle of less than 71* with said first path in the first position of said second platen to thereby move said second platen toward said second position by displacing said first junction in a direction to enlarge the angle between said links.
Claim 3
Dependent Claim
27 words
The combination of claim 1, wherein the angle between said first and second paths in the first position of said second platen is less than 45 degrees.
Claim 4
Dependent Claim
17 words
The combination of claim 1, wherein the second ends of said levers are pivotable about said axis.
Claim 5
Dependent Claim
12 words
The combination of claim 1, wherein said levers are of identical length.
Claim 6
Dependent Claim
32 words
The combination of claim 4, further comprising pivot means articulately connecting said first portion of said prime mover to said first lever intermediate said first and second ends of said first lever.
Claim 7
Dependent Claim
21 words
The combination of claim 5, wherein said links are of identical length which is less than the length of said levers.
Claim 8
Dependent Claim
70 words
The combination of claim 1, wherein the distance between the said first and second ends of said first lever is greater than the distance between said first and second ends of said second lever and wherein said links are of identical length, and further comprising pivot means articulately connecting said first portion of said prime mover to said first lever intermediate the first and second ends of said first lever.
Claim 9
Dependent Claim
279 words
In an injection molding machine, the combination of a first platen; elongated guide means extending from said first platen; a second platen movable with reference to said guide means along a first straight line path between a first position nearer to and a second position remote from said first platen; and apparatus for moving said second platen, comprising first and second toggle links making with each other an acute angle in the first position of said second platen and having first ends respectively pivoted to said first and second platens and second ends pivoted to each other to form a first junction, first and second levers having first ends respectively pivoted to said first and second platens and second ends pivoted to each other to form a second junction, the first ends of said first link and said first lever being pivotable with reference to said first platen about a first common pivot axis, and the first ends of said second link and said second lever being pivotable with reference to said second platen about a second common pivot axis which is parallel to said first axis, and a prime mover including a first portion pivotally connected with one of the two elements including said first lever and said second junction and a second portion pivotally connected to said first junction and movable relative to said first portion along a second straight line path which makes an angle of less than 71* with said first path in the first position of said second platen to thereby move said second platen toward said second positon by displacing said first junction in a direction to enlarge the angle between said links.
Claim 10
Dependent Claim
279 words
In an injection molding machine, the combination of a first platen; elongated guide means extending from said first platen; a second platen movable with reference to said guide means along a first straight line path between a first position nearer to and a second position remote from said first platen; and apparatus for moving said second platen, comprising first and second toggle links making with each other an acute angle in the first position of said second platen and having first ends respectively pivoted to said first and second platens and second ends pivoted to each other to form a first junction, first and second levers having first ends respectively pivoted to said first and second platens and second ends pivoted to each other to form a second junction, the first ends of said first link and said first lever being pivotable with reference to said first platen about a first common pivot axis, and the first ends of said second link and said second lever being pivotable with reference to said second platen about a second common pivot axis which is parallel to said first axis, and a prime mover including a first portion pivotally connected with one of the two elements including said first lever and said second junction and a second portion pivotally connected to said first junction and movable relative to said first portion along a second straight line path which makes an angle of less than 71* with said first path in the first position of said second platen to thereby move said second platen toward said second positon by displacing said first junction in a direction to enlarge the angle between said links.
Claim 11
Dependent Claim
18 words
The combination of claim 8, wherein said bell crank has two arms making an angle of about 90*.
Claim 12
Dependent Claim
61 words
The combination of claim 9, wherein said arms of said bell crank have outer ends respectively constituting the first and second ends of said first lever and further comprising pivot means articulately connecting said first lever with said first portion of said prime mover in the region of the apex of said bell crank, said outer ends being of identical length.
Claim 13
Dependent Claim
46 words
The combination of claim 8, wherein said apparatus further comprises third and fourth links respectively parallel to said first and second links and having first ends respectively pivoted to said first and second platens and second ends pivoted to each other to form a third junction.
Claim 14
Dependent Claim
18 words
The combination of claim 11, further comprising a connector link coupling said first junction with said third junction.
Claim 15
Dependent Claim
62 words
The combination of claim 11, wherein said first ends of said first link and said first lever are pivotable with reference to said first platen about a first pivot axis and the first ends of said second link and said second lever are pivotable with reference to said second platen about a second pivot axis which is parallel to said first axis.
Claim 16
Dependent Claim
41 words
The combination of claim 13, wherein the first ends of said third and fourth links are respectively pivotable with reference to said first and second platens about third and fourth pivot axes which are parallel to said first and second axes.
Claim 17
Dependent Claim
34 words
The combination of claim 8, wherein said first portion of said prime mover is a double-acting cylinder and said second portion includes a piston rod having a piston which is reciprocable in said cylinder.
Claim 18
Dependent Claim
100 words
The combination of claim 8, wherein said guide means comprises a plurality of parallel tie rods and said first and second portions of said prime mover are respectively pivotable relative to said first junction and said first lever, and further comprising a support remote from said first platen and connected with said tie rods, a first mold section mounted on said support and facing said second platen, and a second mold section mounted on said second platen and facing said first mold section, said second mold section engaging said first mold section in the second position of said second platen.
Claim 19
Dependent Claim
26 words
The combination of claim 1, wherein the angle between said first and second paths in the first position of said second platen is less than 45*.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |