Patent US3756757A successfully refreshed from Google Patents.
US3756757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tie bar sprocket mounting for injection-molding machine
Assignee: Western Atlas Inc
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Filing: 1971-04-05
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Granted: 1973-09-04
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Expires: 1991-04-05
Abstract
Abstract An injection-molding machine has a staionary platen and a movable clamp housing joined by tie bars which slidably carried within the clamp housing. Angular motion of a nut carried by threads on the tie bar drives the clamp housing towards and away from the stationary platen. The drive for the nut includes a sprocket suspension wherein the sprocket is carried by a support independent of the tie bar threads which reduce radial forces on the threads.
Inventors
- 👤 V Grundmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:54
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/1751; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
An injection-molding machine a. A clamp housing member and stationary platen member, one of said members having a plurality of apertures therein; b. A plurality of generally cylindrical tie bars, each of said bars being fixedly attached to the other of said members and cooperatively dimensioned and axially aligned for closely spaced sliding movement in one of said apertures, said tie bars having threads circumferentially disposed distal said fixed end; c. Internally threaded nuts carried by each of said tie bars, said nuts being cooperatively dimensioned and configured for engagement with said tie bar threads and having a face for engagement with said one member; d. Means for support engaging said one member and having a generally circular portion; e. Generally circular drive means drivingly engaging each of said nuts and said generally circular portion, said drive means having a shoulder engaging said means for support and having a shoulder extending over at least a portion of the periphery of said means for support.
Claim 2
Dependent Claim
164 words
An injection-molding machine a. A clamp housing member and stationary platen member, one of said members having a plurality of apertures therein; b. A plurality of generally cylindrical tie bars, each of said bars being fixedly attached to the other of said members and cooperatively dimensioned and axially aligned for closely spaced sliding movement in one of said apertures, said tie bars having threads circumferentially disposed distal said fixed end; c. Internally threaded nuts carried by each of said tie bars, said nuts being cooperatively dimensioned and configured for engagement with said tie bar threads and having a face for engagement with said one member; d. Means for support engaging said one member and having a generally circular portion; e. Generally circular drive means drivingly engaging each of said nuts and said generally circular portion, said drive means having a shoulder engaging said means for support and having a shoulder extending over at least a portion of the periphery of said means for support.
Claim 3
Dependent Claim
26 words
An injection-molding machine as described in claim 1 wherein said means for support comprises a cylindrical extension engaging said shoulder for concentric sliding torsional motion therebetween.
Claim 4
Dependent Claim
71 words
An injection-molding machine as described in claim 2 wherein said means for support and said generallY circular drive means have cooperating shoulders disposed generally perpendicularly to the axis of said tie bars whereby rotation of said drive means to move said nut away from said other member causes engagement of said shoulders and thereby movement of said one member in a direction parallel with the longitudinal axis of said tie bars.
Claim 5
Dependent Claim
17 words
An injection-molding machine as described in claim 1 wherein said generally circular drive means comprises a sprocket.
Claim 6
Dependent Claim
17 words
An injection-molding machine as described in claim 1 wherein said generally circular drive means comprises a gear.
Claim 7
Dependent Claim
20 words
An injection-molding machine as described in claim 4 wherein said sprocket is fixed to one of said nuts by bolts.
References Cited (Backward Citations)
US3093863A
Cited
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Cited
US3433290A
Cited
US3373596A
Cited
US3508300A
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US3588957A
Cited
US3669599A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |