US3729047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Die-casting machine
Assignee: Idra Pressen GmbH
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Filing: 1972-01-28
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Granted: 1973-04-24
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Expires: 1992-01-28
Abstract
Abstract In a die casting machine having a piston rod attached to a pressure or firing piston thereof, a device for measuring the speed of said piston comprises: a reflector on said piston rod; a first member arranged generally parallel to said piston rod and carrying a plurality of regularly spaced light transmitters; and a second member also arranged generally parallel to the piston rod and carrying a plurality of regularly spaced light receivers, said members being arranged so that as the piston rod moves during a casting operation light from each transmitter is reflected into a corresponding receiver as the reflector carried by the piston passes therealong, the transmitters passing a series of pulses to a recorder from which the speed of the piston rod, and thus the piston, can be determined.
Inventors
- 👤 F Bohnlein
- 👤 G Stollmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:29
CPC Classifications
B; B22; B22D; B22D17/00; B22D17/20; B22D17/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
A cold chamber die-casting machine having a firing piston, a piston rod connected thereto and a device for measuring the speed of movement of said piston, said device comprising: a reflector mounted on said piston rod; a first member disposed generally parallel to said piston rod and carrying a plurality of regularly spaced light transmitters; a second member disposed generally parallel to said piston rod and carrying a plurality of regularly spaced light receivers, said members being so arranged that light from any one of said transmitters is reflected by said reflector to a corresponding one of said light receivers when said reflector is adjacent said one transmitter.
Claim 2
Dependent Claim
108 words
A cold chamber die-casting machine having a firing piston, a piston rod connected thereto and a device for measuring the speed of movement of said piston, said device comprising: a reflector mounted on said piston rod; a first member disposed generally parallel to said piston rod and carrying a plurality of regularly spaced light transmitters; a second member disposed generally parallel to said piston rod and carrying a plurality of regularly spaced light receivers, said members being so arranged that light from any one of said transmitters is reflected by said reflector to a corresponding one of said light receivers when said reflector is adjacent said one transmitter.
Claim 3
Dependent Claim
29 words
A die-casting machine according to claim 1, wherein said members are in the form of flat strips arranged at equal angles of inclination to a normal through said transmitter.
Claim 4
Dependent Claim
34 words
A die-casting machine according to claim 1, wherein said light emitters are constituted by respective one ends of transparent light conducting filaments, the other ends of which are directed towards a common light source.
Claim 5
Dependent Claim
24 words
A die-casting machine according to claim 3 wherein a convex lens is disposed between said other ends of the filaments and said light source.
Claim 6
Dependent Claim
37 words
A machine according to claim 1 wherein said light receivers are in the form of respective one ends of a plurality of light conducting transparent filaments, the other ends of which one directed towards a photoelectric receiver.
Claim 7
Dependent Claim
14 words
A machine according to claim 5 wherein said photoelectric receiver comprises a single photodiode.
Claim 8
Dependent Claim
59 words
A machine according to claim 5 wherein said photoelectric receiver comprises a set of photodiodes, the receiving light conductors being arranged in a plurality of groups, conductors from each group leading to one of the sets of photodiodes, and each photodiode being connected to a recorder which records impulses from each photodiode distinctly from impulses from the other photodiodes.
Claim 9
Dependent Claim
46 words
A machine according to claim 1 further comprising a recorder having a paper tape upon which marks are made in response to impulses passed thereto as said piston rod moves and so moves the reflector to transmit light from said light emitters to said light receivers.
Claim 10
Dependent Claim
23 words
A machine according to claim 7 wherein a common convex lens is arranged between each group of receiving filaments and the respective photodiode.
Claim 11
Dependent Claim
46 words
A machine according to claim 1, wherein said piston rod is connected to a press piston rod of the machine by a screw cap connection and said reflector is constituted by a facetted highly polished ring of greater diameter than and secured to said screw cap.
References Cited (Backward Citations)
US3514617A
Cited
US3575129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |