US3844703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knock-out arrangement for an injection molding machine
Assignee: Individual
•
Filing: 1973-10-02
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Granted: 1974-10-29
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Expires: 1993-10-02
Abstract
Abstract The knock-out bar and ejector pins for the mold of an injection molding machine are operated through a coupling of which a first member is fastened to the knock-out bar while the second member is secured to an actuating mechanism, received in a tubular end portion of the first member when the coupling is engaged, and locked there by spring biased rollers or balls guided in openings of the tubular portion of the first coupling member obliquely inclined toward the coupling axis when the ejector pins are withdrawn. When the ejector pins reach their rest position, cooperating guide faces on the first coupling member and on a sleeve enveloping the engaged coupling members retract the rollers or balls as the sleeve is arrested by abutting engagement with the mold mounting plate.
Inventors
- 👤 G Hutter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:10
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/40; B29C45/4005; B22; B22D; B22D17/00; B22D17/20; B22D17/22; B22D17/2236; B29C45/1775
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
253 words
In a knock-out arrangement for an injection molding machine including a support; a knock-out member movable on said support in a predeterminded direction toward and away from a rest position, a first coupling member fixedly mounted on said knockout member, a second coupling member movable in said direction toward and away from a position of engagement with said first coupling member, and actuating means for moving said second coupling member toward and away from said position thereof, and for moving said knock-out member toward and away from said rest position when said coupling members are engaged, the improvement which comprises: a. at least one locking element of circular cross section movably secured on one of said coupling members, 1. the other coupling member being formed with a recess aligned with said at least one locking element transversely of said direction in said position of engagement; b. yieldably resilient means biasing said at least one locking element inward of said recess and thereby locking said coupling members for joint movement in said direction when said at least one element is received in said recess; and c. guide means on said support and on said one coupling member cooperating for retracting said at least one locking element from said recess in response to movement of said knock-out member toward said rest position, 1. one of said guide means including a guide face associated with each locking element and obliquely inclined relative to said direction, said guide face engaging the associated locking element during said retracting.
Claim 2
Dependent Claim
253 words
In a knock-out arrangement for an injection molding machine including a support; a knock-out member movable on said support in a predeterminded direction toward and away from a rest position, a first coupling member fixedly mounted on said knockout member, a second coupling member movable in said direction toward and away from a position of engagement with said first coupling member, and actuating means for moving said second coupling member toward and away from said position thereof, and for moving said knock-out member toward and away from said rest position when said coupling members are engaged, the improvement which comprises: a. at least one locking element of circular cross section movably secured on one of said coupling members, 1. the other coupling member being formed with a recess aligned with said at least one locking element transversely of said direction in said position of engagement; b. yieldably resilient means biasing said at least one locking element inward of said recess and thereby locking said coupling members for joint movement in said direction when said at least one element is received in said recess; and c. guide means on said support and on said one coupling member cooperating for retracting said at least one locking element from said recess in response to movement of said knock-out member toward said rest position, 1. one of said guide means including a guide face associated with each locking element and obliquely inclined relative to said direction, said guide face engaging the associated locking element during said retracting.
Claim 3
Dependent Claim
53 words
In an arrangement as set forth in claim 1, said one coupling member being said first coupling member, the arrangement including two of said locking elements, said one coupling member having a tubular portion formed with a bore extending in said direction and receiving said other coupling member in said position of engagement.
Claim 4
Dependent Claim
45 words
In an arrangement as set forth in claim 2, said one coupling member being formed with two openings communicating with said bore and movably receiving said locking elements respectively, a face of said one coupling member in each of said openings constituting said guide face.
Claim 5
Dependent Claim
28 words
In an arrangement as set forth in claim 3, said tubular portion having an axis extending in said direction, and said openings being symmetrical relative to said axis.
Claim 6
Dependent Claim
53 words
In an arrangement as set forth in claim 3, said locking elements being elongated, the longitudinal end portions of each element projecting outward of the associated opening when said element is received in said recess and when said element is Retracted from said recess, said yieldably resilient means engaging said projecting end portion.
Claim 7
Dependent Claim
64 words
In an arrangement as set forth in claim 3, said locking elements being elongated, the longitudinal end portions of each element projecting outward of the associated opening when said element is received in said recess and when said element is retracted from said recess, the guide means on said support engaging said projecting end portions in response to said movement of said knock-out member.
Claim 8
Dependent Claim
63 words
In an arrangement as set forth in claim 2, said locking elements being elongated, the longitudinal end portions of each element projecting outward of the associated opening when said element is received in said recess and when said element is retracted from said recess, and said yieldably resilient means including a tension spring connecting respective longitudinal end portions of said two locking elements.
Claim 9
Dependent Claim
72 words
In an arrangement as set forth in claim 2, said locking elements being spherical, said one coupling member being formed with two openings communicating with said bore and movably receiving said locking elements respectively for movement toward and away from respective positions in which each locking element projects from the associated opening in two opposite directions, a face of said one coupling member in each of said openings constituting said guide face.
Claim 10
Dependent Claim
32 words
In an arrangement as set forth in claim 2, said other coupling element having a tapering end portion directed inward of said bore when said coupling element approaches said position of engagement.
Claim 11
Dependent Claim
107 words
In an arrangement as set forth in claim 2, the guide means on said support including a sleeve member movable on said support in said direction toward and away from a predetermined position, and cooperating abutment means on said support for arresting said sleeve member in said predetermined position when said sleeve member moves in the direction of movement of said knock-out member toward said rest position, a portion of said sleeve member engaging said at least one locking element when said sleeve member is arrested in said predetermined position while said one coupling member approaches said rest position, said sleeve member enveloping said one coupling member.
Claim 12
Dependent Claim
39 words
In an arrangement as set forth in claim 10, said one coupling member being formed with two openings communicating with said bore and movably receiving said locking elements respectively, said portion of said sleeve member constituting each guide face.
References Cited (Backward Citations)
US3572424A
Cited
US3737268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |