US3613772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection piston for diecasting
Assignee: Individual
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Filing: 1968-12-27
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Granted: 1971-10-19
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Expires: 1988-12-27
Abstract
Abstract An injection piston is provided with automatic lubrication at any location in an injection chamber. A central conduit communicates with flow passages on the piston wall. Within the conduit is a spring-loaded valve to control the flow of lubricant through the flow passages and onto the chamber wall.
Inventors
- 👤 Irving A Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:35
CPC Classifications
B; B22; B22D; B22D17/00; B22D17/20; B22D17/2015; B22D17/2038
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
231 words
In a die-casting apparatus provided with an injection chamber and an injection piston adapted for reciprocating action, the improvement which comprises: a. outlet means on the circumferential wall of the injection piston; b. means to feed a lubricant to said outlet means; c. conduit means disposed in the piston having an upstream end and a downstream end, said downstream end located closer to the head end of said piston than said outlet means; d. slot means in said piston having a first end and a second end said slot means substantially parallel to the conduit means the first end of said slot means in fluid flow communication with the conduit means and the second end of the slot means in fluid flow communication with the outlet means; and e. means for controlling the flow of the lubricant from the conduit means to the slot means and then to the outlet means whereby the lubricant flows from the upstream end of the conduit means to the downstream end into the slot means and then flows upwardly towards the second end of the slot means and subsequently through the outlet means to lubricate the piston walls wherein after the lubricant has flowed through the conduit and slot means in sufficient quantity to lubricate said piston any excess lubricant will flow back downwardly from the second to the first end of the slot means.
Claim 2
Dependent Claim
231 words
In a die-casting apparatus provided with an injection chamber and an injection piston adapted for reciprocating action, the improvement which comprises: a. outlet means on the circumferential wall of the injection piston; b. means to feed a lubricant to said outlet means; c. conduit means disposed in the piston having an upstream end and a downstream end, said downstream end located closer to the head end of said piston than said outlet means; d. slot means in said piston having a first end and a second end said slot means substantially parallel to the conduit means the first end of said slot means in fluid flow communication with the conduit means and the second end of the slot means in fluid flow communication with the outlet means; and e. means for controlling the flow of the lubricant from the conduit means to the slot means and then to the outlet means whereby the lubricant flows from the upstream end of the conduit means to the downstream end into the slot means and then flows upwardly towards the second end of the slot means and subsequently through the outlet means to lubricate the piston walls wherein after the lubricant has flowed through the conduit and slot means in sufficient quantity to lubricate said piston any excess lubricant will flow back downwardly from the second to the first end of the slot means.
Claim 3
Dependent Claim
21 words
The piston of claim 1 wherein the means to control the flow of lubricant to the outlet means includes valve means.
Claim 4
Dependent Claim
60 words
The piston of claim 2 wherein the valve means is disposed within the conduit means and is biased to a closed position to seal the conduit means from the outlet means and further said valve means is responsive to pressure means to provide for the flow of lubricant through the conduit means, the slot means and into the outlet means.
Claim 5
Dependent Claim
31 words
The piston of claim 1 wherein the outlet means includes flow passages disposed on the circumferential wall of the injection piston which flow passes are in communication with the slot means.
Claim 6
Dependent Claim
60 words
The piston of claim 1 wherein the outlet means includes a plurality of ducts extending radially outward from and in communication with the slot means, and includes valve means disposed iN the conduit means adapted to close the conduit means from the slot means when in a closed position, and further said valve means is responsive to changes in pressure.
Claim 7
Dependent Claim
91 words
The piston of claim 1 wherein the means to control the flow of lubricant includes spring-biased valve means disposed in the conduit means, the conduit means are centrally disposed within the piston whereby when the valve means is moved from a closed to an open position lubricant flows through the conduit means, the slot means and the duct means to lubricate the chamber wall in the piston; and further when the valve means retracts to the closed position any excess lubricant in the duct and slot flows back into the piston.
Claim 8
Dependent Claim
82 words
The piston of claim 1 wherein the casting apparatus includes: an upper mold element in which element is the injection chamber with an injection piston disposed therein, a lower mold element characterized by an ejection chamber having an ejection piston disposed therein, said elements defining a casting cavity when in the closed position, said casting cavity in communication with the injection chamber, whereby the injection piston may be lubricated for any length of time independent of the piston of the injection piston.
Claim 9
Dependent Claim
55 words
The piston of claim 1 wherein the downstream end of the conduit means terminates in a recess and the first end of the slot means is in communication with said recess whereby when the valve means is in a closed position, excess lubricant in the ducts will flow through the slots and into the recess.
Claim 10
Dependent Claim
193 words
An injection piston in a die-casting apparatus adapted for reciprocating action which comprises: a first lower section having a central tubular opening therein terminating in a recess in the lower portion of the section, the section further characterized by at least one slot generally parallel to the opening and in communication with the recess; an annular groove disposed within the upper portion of the section, and intersecting the slot; ducts extending radially outward from the groove and terminating on the piston wall; a second upper section characterized by a central conduit therein and adapted to be secured to the first section the opening of the first section and the conduit of the second section forming a continuous flow passage when the first and second sections are secured; and valve means to control the flow of lubricant through the first and second sections whereby when the lubricant is introduced under pressure into the second section through the conduit, the lubricant flows through the tubular opening in the first section and into the recess through the slot into the annular groove and then outwardly through the ducts and onto the chamber wall to provide lubrication.
Claim 11
Dependent Claim
193 words
An injection piston in a die-casting apparatus adapted for reciprocating action which comprises: a first lower section having a central tubular opening therein terminating in a recess in the lower portion of the section, the section further characterized by at least one slot generally parallel to the opening and in communication with the recess; an annular groove disposed within the upper portion of the section, and intersecting the slot; ducts extending radially outward from the groove and terminating on the piston wall; a second upper section characterized by a central conduit therein and adapted to be secured to the first section the opening of the first section and the conduit of the second section forming a continuous flow passage when the first and second sections are secured; and valve means to control the flow of lubricant through the first and second sections whereby when the lubricant is introduced under pressure into the second section through the conduit, the lubricant flows through the tubular opening in the first section and into the recess through the slot into the annular groove and then outwardly through the ducts and onto the chamber wall to provide lubrication.
Claim 12
Dependent Claim
29 words
The piston of claim 9 wherein the outer wall of the first section is characterized by a peripheral recessed portion therein and the ducts terminate in said recessed portion.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |