Patent US3698640A successfully refreshed from Google Patents.
US3698640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wax injection nozzle
Assignee: Tempcraft Tool and Mold Inc
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Filing: 1971-07-14
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Granted: 1972-10-17
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Expires: 1991-07-14
Abstract
Abstract A nozzle assembly for injecting a flowable and moldable material, such as hot wax, into a die has an elongated generally cylindrical housing having a discharge nozzle at one end controlled by a valve in the housing which is frusto-conical converging toward the nozzle and seated against a complementary frusto-conical seat. The valve plug has a piston rod extending rearwardly axially of the housing and terminating in a piston housed in a tubular cylinder with pressure fluid means for causing movement of the piston to open and close the valve. An adjustable stop is provided at the rear end of the housing against which an extension of piston engages to limit opening movement of the valve. The housing is adapted to be assembled in a reservoir full of hot wax under pressure which enters through an opening in the housing when the valve is open so as to flow through the nozzle to a mold die. The complete housing is movable endwise through the hot wax reservoir to and from the die to be injected. The means for doing this comprises a piston on the housing which is encased in a tubular cylinder with means provided to apply pressure fluid against one or the other faces of this piston to move the entire housing lengthwise.
Inventors
- 👤 Virgil V Stanciu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:52
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/24; B29C67/241
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
160 words
A nozzle assembly for injecting a flowable and moldable material into a die, comprising an elongated generally cylindrical housing having a nozzle tip with a discharge opening at one end, a material control valve in said housing having an outlet communicating with said discharge opening and having a material inlet spaced upstream of said housing relative to said outlet, said valve being so constructed as to be opened and closed by movement of one portion of said valve axially of said housing respectively away from and toward said outlet, means in said housing spaced from said outlet for causing said axial movement of said one portion of said valve, stationary means supporting said housing intermediate the ends for endwise movement of said housing relative to said stationary means, a portion of said housing being reciprocatably slidable in said stationary means, and power means operatively connected between said portion of said housing and said stationary means for so reciprocating said housing.
Claim 2
Dependent Claim
160 words
A nozzle assembly for injecting a flowable and moldable material into a die, comprising an elongated generally cylindrical housing having a nozzle tip with a discharge opening at one end, a material control valve in said housing having an outlet communicating with said discharge opening and having a material inlet spaced upstream of said housing relative to said outlet, said valve being so constructed as to be opened and closed by movement of one portion of said valve axially of said housing respectively away from and toward said outlet, means in said housing spaced from said outlet for causing said axial movement of said one portion of said valve, stationary means supporting said housing intermediate the ends for endwise movement of said housing relative to said stationary means, a portion of said housing being reciprocatably slidable in said stationary means, and power means operatively connected between said portion of said housing and said stationary means for so reciprocating said housing.
Claim 3
Dependent Claim
31 words
A nozzle assembly as defined in claim 1, including adjustable stop means carried by said housing for limiting said movement of said one portion of said valve away from said outlet.
Claim 4
Dependent Claim
51 words
A nozzle assembly as defined in claim 1, wherein said stationary means is rigid with a wall of a hot wax reservoir, and said material inlet is submerged in wax-receiving position in hot wax in said reservoir, together with means for varying the pressure on said hot wax in said reservoir.
Claim 5
Dependent Claim
70 words
A nozzle assembly as defined in claim 1, wherein said stationary means includes a tubular portion spaced radially outside and concentric with said slidable portion of said housing, and said power means includes an annular piston rigid with said housing portion and sealed against said tubular portion and means for applying pressure fluid effective selectively against either face of said annular piston for reciprocating said housing in said stationary means.
Claim 6
Dependent Claim
49 words
A nozzle assembly as defined in claim 1, wherein said material control valve comprises a frusto-conical seat rigid with said housing and having walls converging toward said nozzle tip and said movable valve portion is a frusto-conical plug having an outer surface complementary to said walls of said seat.
Claim 7
Dependent Claim
73 words
A nozzle assembly as defined in claim 5, wherein said plug has a piston rod connected to its rear end remote from said nozzle tip, said rod extending rearwardly concentric with said housing and said means for causing axial movement of said one portion of said valve including a valve control piston at the rear end of said rod reciprocatable in said housing and means for supplying pressure fluid to operate said piston.
Claim 8
Dependent Claim
49 words
A nozzle assembly as defined in claim 6, including a valve control piston extension extending rearward therefrom, and a stop adjustable axially of said housing in position to be engaged by said extension upon rearward, valve-opening movement thereof, whereby the extent of valve opening may be repeatedly controlled uniformly.
Claim 9
Dependent Claim
65 words
A nozzle assembly as defined in claim 7, including a passageway in said extension in communication with the valve opening face of said valve control piston, said passageway terminating adjacent the rearward end of said extension, and there being an opening through said housing there permitting access of a pressure fluid conduit to said passageway terminal throughout said valve-opening movement of said valve control piston.
Claim 10
Dependent Claim
50 words
A nozzle assembly as defined in claim 7, including an enclosed hot wax reservoir, means for varying the pressure on wax in said reservoir, said stationary means is rigid with a wall of said reservoir, and said material inlet is submerged in wax-receiving position in hot wax in said reservoir.
Claim 11
Dependent Claim
23 words
A nozzle assembly as defined in claim 9, including means for varying the rate of movement of said valve plug in valve-opening direction.
Claim 12
Dependent Claim
27 words
A nozzle assembly as defined in claim 1, including means for varying the rate of axial movement of said one portion of said valve in valve-opening direction.
Claim 13
Dependent Claim
119 words
A nozzle assembly as defined in claim 1, including adjustable stop means carried by said housing for limiting said movement of said one portion of said valve away from said outlet for maximum wax flow, said means for causing said axial movement of said one portion of said valve away from said outlet comprises a pressure-fluid-actuated cylinder and piston motor control means for setting said pressure fluid flow to said last named motor at a desired setting, and with said housing submerged in a hot wax reservoir with said material inlet in wax-receiving position is said hot wax and with said hot wax at a predetermined pressure, whereby substantially identical injections of the same die may be repeated successively.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |