Source: http://www.patentgenius.com/patent/7287549.html
Timestamp: 2018-05-22 02:45:03
Document Index: 73184983

Matched Legal Cases: ['art 125', 'art 122', 'art 122', 'art 164', 'art 164', 'art 66', 'art 152', 'art 54', 'art 24', 'art 66', 'art 24', 'art 66', 'art 123', 'art 24', 'art 24', 'art 228']

Valve pin cross over nozzle for stack mould - Patent # 7287549 - PatentGenius
Valve pin cross over nozzle for stack mould
7287549 Valve pin cross over nozzle for stack mould
Application: 10/578,459
Assignee: Stackteck Systems, Ltd (Brampton, Ontario, CA)
Attorney Or Agent: O'Toole; J. HerbertNexsen Pruet, LLC
U.S. Class: 137/614; 137/614.03; 425/562; 425/563; 425/564
Field Of Search: 137/614; 137/614.03; 425/562; 425/563; 425/564
International Class: F16L 37/23; B29C 45/23
U.S Patent Documents: 3205911; 4299791; 5460510; 6811393
Foreign Patent Documents: 60240425
Other References: Bagusche G. et al.: "Heisskanaltechnik In Etagenwerkzeugen Hot Runner Technology in Multi-Daylight Moulds", Kunststoffe, Carl Hanser Verlag.Munchen, DE, vol. 85, Nr. 6 pp. 758-760 XP000495990, ISSN: 0023-5563. cited by other.
Abstract: According to the present invention, a cross over nozzle (10) is provided of two parts (22,24) which, when joined, define a housing (20) having a passage (30) extending therethrough, a tapered valve seat (50) extending about the passage and a value member (60) having a tapered valve head (62) disposed in the passage for engaging the valve seat. The two parts (64,66) are axially separable at an interface (68) extending through the valve seat/valve head. In order to open the valve, both valve parts are first joined and then moved together as one member in the same direction relative to the housing axially away from the valve seat. Similarly, the valve members are jointly moved into engagement with the valve seat before the cross over nozzle is separated. Accordingly, unlike the valve gate design, the valve interface between the two parts of the valve head isn't exposed to molten resin and therefore molten resin isn't trapped therebetween to cause a string upon opening.
1. A valved cross over nozzle comprising: a nozzle housing with a melt passage extending therethrough, a valve axis extending along said passage and a tapered valveseat in said passage extending about said valve axis; said nozzle housing having a first housing part and a second housing part separable along said valve axis through said valve seat at a housing interface, with a first valve seat part being carried bysaid first housing part and a second valve seat part being carried by said second housing part; a valve member having a tapered valve head disposed in said passage and axially movable relative to said nozzle housing between a closed configurationwherein said valve head engages said valve seat to block melt flow along said passage and an open configuration wherein said valve head is displaced from said valve seat to allow melt flow along said passage about said valve head; said valve head havinga first valve head part and a second valve head part which meet at a valve interface corresponding to said nozzle interface and at which said valve member is separable along said axis into first and second valve parts for respectively sealing said firstand second nozzle parts in said closed configuration; a valve opening actuator acting between said valve member and said nozzle housing for causing simultaneous movement of said first and second valve parts relative to said nozzle housing toward saidopen configuration when said first and second nozzle housing parts and first and second valve parts are joined; a first valve closing actuator acting between said first valve part and said first housing part to bias said first valve part toward itsclosed configuration; and, a second valve closing actuator acting between said second valve part and said second housing part to bias at least said second valve part toward its closed configuration; wherein said first housing part has a base part andan outer part which are telescopically connected for relative axial movement along said valve axis; a biasing means acts between said base part and said outer part to urge said outer part away from said base part; said first valve seat part is carriedby said outer part; a first valve stem extends between and rigidly secures said first valve head part and said base part; said first valve head part engages said first valve seat part to limit movement of said outer part away from said inner part; said valve opening actuator causes movement of said second housing part toward said first housing part and acts against said biasing means to urge said outer part of said first housing part toward said base part in turn causing relative movement of saidvalve head and said valve seat to move said valve member into said open configuration; said biasing means between said base part and said outer part of said first housing part acts as said first valve closing actuator; a second valve stem extendsbetween and operably connects said second valve head part with said second closing actuator; and wherein at least a portion of said first valve stem sealingly engages said first housing part; and, said melt passage extends along an interior of saidfirst valve stem.
2. The cross over nozzle of claim 1 wherein: at least a portion of said second valve stem sealingly engages said second housing part; and said melt passage extends along an interior of said second valve stem whereby in said open configurationsaid melt flows along said interior of said first and said second valve stems and about said valve member between said valve member and said seat.
3. The cross over nozzle of claim 2 wherein: said melt passage extends axially along said interior of said first and second valve stems; and, said melt passage diverges toward said first valve head part and said second valve head part to exitsaid valve stem through at least one opening adjacent each of said first and said second valve head parts.
4. The cross over nozzle of claim 3 wherein: said biasing means acts against a mould face; said outer part, said first valve head part and said first valve stem are removably mounted to said mould face for removal from said mould face withoutmould disassembly; said second housing part has an inner section and an outer section with said second valve seat part being carried by said outer section; and, said outer section and said inner section are separably axially joined to provide forremoval of said outer section, said second valve head part and said second valve stern without mould disassembly.
The first valve stem may be provided with a hollow interior which defines a portion of the melt passage and the first valve stem may sealingly engage the first housing part.
At least a portion of the second valve stem may also sealingly engage the second housing part and the melt passage may extend along an interior of the second valve stem. Accordingly in the open configuration melt may flow along the interior ofthe first and second valve stems and about the valve member between the valve member and the valve seat.
The melt passage may extend axially along the interior of the first and second valve stems and diverge toward the first and second valve head parts to exit the valve stem through at least one opening adjacent each of the first and second valvehead parts.
The biasing means may act against a face of the mould and the outer part of the first valve head part and first valve stem may be removable from the face without mould disassembly. Furthermore the second housing part may have an inner sectionand an outer section with the second valve seat part being carried by the outer section. The outer section and the inner section may be separably axially joined to provide for removal of the outer section, the second valve head part and the second valvestem without mould disassembly.
FIG. 5 is an axial sectional view of the cross over nozzle of FIG. 4 in a joined and open configuration;
FIG. 6 is an axial sectional view of the cross over nozzle of FIG. 4 in a closed and separated configuration;
FIG. 7 is a partially cut-away perspective view of another embodiment of a cross over nozzle according to the present invention in a joined and open configuration;
FIG. 8 is a view corresponding to FIG. 7 but illustrating the cross over nozzle in a closed and separated configuration; and
FIG. 9 is an axial sectional view illustrating an alternative mounting arrangement for the FIGS. 7 and 8 embodiment.
In FIGS. 7 and 8, another embodiment of a cross over nozzle according to the present invention is generally indicated by reference 200. The cross over nozzle 200 is similar to the cross over nozzle 100 in FIGS. 4 through 6 in that it isactuatable by machine movement without requiring a separate hydraulic actuating system. It differs principally in melt directing and placement. Similar reference numerals are applied to analogous components.
According to the FIGS. 7 and 8 embodiment, the first valve stem 170 is a hollow member which sealingly engages the outer part 125 of the first housing part 122. Rather than having the melt passage 30 defined between the first valve stem 170 andthe first housing part 122, the melt passage 30 extends axially along the hollow interior of the first valve stem 170. Melt exits the first valve stem 170 through one or more openings 210 adjacent the first valve head part 164. Valve head operation ismuch the same as for the other embodiments in that the valve head has a first valve head part 164 and a second valve head part 66 each of which interfaces respectively with the first valve seat part 152 and the second valve seat part 54 separable alongthe housing interface 26.
The second valve stem 76 may be configured in a similar manner with a second valve stem 76 being hollow and sealingly engaging the second housing part 24. The melt passage 30 extends axially along the hollow interior of the second valve stem 76. Melt enters the interior through one or more openings 212 located adjacent the second valve head part 66.
There are two significant advantages to the FIGS. 7 and 8 embodiment. A first is that it is "front mounted" in that the assembly can be removed from the face of a mould rather than requiring mould disassembly. This is achieved in the first partby securing screws 225 which extend through the biasing means which in this case are coil springs 227 for securement to a mould face (not shown). This is achieved in the second housing part 24 by forming the second housing part in two sections namely anouter section 226 and an inner section 228 which are threadedly or otherwise axially connected at 230 and providing a bore 232 in the outer section 228 large enough to enable passage over the second valve head part 66.
Alternatively the entire unit including the outer section 226 and the base part 123 may be removable from a mould face 250 as illustrated in FIG. 9. This is achieved by providing a clamping ring 252 which engages an outer end 254 of the outersection 226. The clamping ring 252 is threadedly secured to the mould face 250 by screws 256. Preferably the screws 256 and clamping ring 250 will be configured to melt flush with the balance of the mould face 250.
The cross over nozzle 200 is provided with a coil spring 290 as the second valve closing actuator. The coil spring 290 acts between the second housing part 24 and the second valve stem 76. The second valve stem 76 sealingly engages the secondhousing part 24 beyond both ends of the coil spring 290. Other actuating means may be utilized such as a stack of Belleville.TM. washers. Flats 240 may be provided on the outer part 228 to facilitate gripping with a wrench.
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