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Browse by Category: Main > Material Science
Class Information
Number: 425/151
Name: Plastic article or earthenware shaping or treating: apparatus > With safety feature
Description: Apparatus including means adapted to stop, prevent, or modify the operation of a machine, or relieve a condition when an unguarded, abnormal or unsafe situation which would injure the operator or the machine occurs.










Sub-classes under this class:

Class Number Class Name Patents
425/154 Means to alter operation due to presence of foreign matter or overload 49
425/152 Plural starting buttons or mold operating means dependent upon position of a machine element 30
425/153 Secondary means to prevent accidental motion, (e.g., mold closing, etc.) or means to relieve gaseous pressure 41


Patents under this class:
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Patent Number Title Of Patent Date Issued
8506279 Safety device for punches in a compression moulding apparatus Aug. 13, 2013
8414813 Apparatus and method for manufacturing multi component plastic molded parts Apr. 9, 2013
8376727 Moulder safety guard Feb. 19, 2013
8366430 Mold lock key safety device Feb. 5, 2013
8336601 Safety door automatic opening/closing device in injection molding machine and the like and method of controlling the same Dec. 25, 2012
8192192 Mechanical safety device for an injection molding machine Jun. 5, 2012
8113812 Valve pin bushing assembly for an injection molding apparatus Feb. 14, 2012
8069545 Method for changeover of a blow molding machine Dec. 6, 2011
8062018 Barrier guard for dough sheeter Nov. 22, 2011
7918660 Injection molding actuator position sensing Apr. 5, 2011
7553439 Hidden mold transfer assembly Jun. 30, 2009
7540736 Safety door device of injection molding machine Jun. 2, 2009
7429168 Oven protection system for a thermo-forming machine Sep. 30, 2008
7322812 Transfer lock for a tabletting plant Jan. 29, 2008
7238016 Injection molding machine Jul. 3, 2007
7179074 Device for safeguarding an open position of the closing unit of an injection molding machine Feb. 20, 2007
7156649 Mold for injection molding and a method of operating a mold Jan. 2, 2007
7140856 Method for producing tablets with tablet presses protected from the environment and protective device for such tablet presses Nov. 28, 2006
7118366 Protective device for an injection unit to guard against injury Oct. 10, 2006
7052261 Device for melting and remolding crayons May. 30, 2006
7029261 Automatic cover latch and pressure relief system for a dough divider Apr. 18, 2006
6999823 Power shut-off method for injection molding machine Feb. 14, 2006
6981862 Slush molding machine Jan. 3, 2006
6939124 Locking unit of a three-plate injection-molding machine Sep. 6, 2005
6925354 Process for the control of an injection-moulding machine Aug. 2, 2005
6821102 Drive control apparatus for an injection molding machine Nov. 23, 2004
6769897 Device for monitoring force and pressure in injection molding machines Aug. 3, 2004
6722869 Cotton candy making apparatus Apr. 20, 2004
6655947 Injection molding machine with a protective cover Dec. 2, 2003
6644950 Injection moulding machine Nov. 11, 2003
6520761 Protection apparatus for an injection molding machine Feb. 18, 2003
6315544 Adjustable length extension bars for connecting a mold ejector plate to a press ejector plate Nov. 13, 2001
6312246 Apparatus to produce pasta Nov. 6, 2001
6287104 Mechanical safety cover interlock for an injection-molding machine Sep. 11, 2001
6164947 Safety apparatus for a vertical injection molding machine Dec. 26, 2000
6106265 Stack mold centering system Aug. 22, 2000
6062843 Motor control apparatus for an injection molding machine May. 16, 2000
5935619 Extrusion head with recycling device Aug. 10, 1999
5834036 Safety device for use in clamping unit of molding machine Nov. 10, 1998
5820892 Food extrusion assembly Oct. 13, 1998
5783222 Dough molder Jul. 21, 1998
5731012 Pasta, pastry, cookie and hors d'oeuvre maker Mar. 24, 1998
5670186 Injection molding machine provided molding with a display unit Sep. 23, 1997
5595770 Granulating device for strand materials Jan. 21, 1997
5560940 Device for melting matter by immersion in a bath of hot liguid Oct. 1, 1996
5553659 Die casting machine with safety bar Sep. 10, 1996
5478226 Automatic plunger apparatus for use in forming encapsulated semiconductor chips Dec. 26, 1995
5460505 Injection molding apparatus Oct. 24, 1995
5445773 Method for detecting abnormality in hydraulic system of molding machine and apparatus therefor Aug. 29, 1995
5439366 Safety device for a roll space of a calender or similar roll machine Aug. 8, 1995

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