Abstract A method and apparatus for molding a rubber article from rubbers of two colors. Unvulcanized rubber is placed in a mold cavity. A movable mold member is advanced to spread and compress the rubber which is held in its spread condition until it is vulcanized. The movable member is provided with a peripheral outwardly extending lip for forming, in the rubber flash escaping around the periphery of the mold member, a peripherally extending weakened region. A peripherally extending recess region is also provided adjacent the lip for forming the flash rubber escaping past the lip into the base. After the first rubber has partially set and become vulcanized, the movable mold member is retracted away from the partially set rubber entrained therewith the bead formed in the recessed region thereof and thus tearing the rubber flash along the weakened region. The retraction of the movable mold member continues sufficient to expose a compressed gas inlet through which compressed gas is introduced to blow out through a gas outlet any particles of rubber which were formed during the severing of the rubber flash along the weakened region. After the mold cavity has been so cleaned, a second rubber is introduced into the mold cavity and the movable mold member is moved to spread the second injected rubber and to press it up against the partially set first injected rubber.
In apparatus for molding a two colored sole into a tasted upper; a. a mold side ring for defining part of a mold cavity adapted to be closed at one end by a lasted upper; b. a sole plate slidably disposed in said mold cavity in close confronting relation with said side ring means; c. said sole plate having a surface for confronting said lasted upper and a side wall with a peripheral groove therewithin and a lip thereon between said lasted upper confronting surface and said groove, said lip extending toward and into close proximity with said side ring; d. a first passage through said ring into said mold cavity for introducing rubber therewithin, e. a second passage through said ring into said mold cavity for introducing gas at high velocity into said mold cavity; f. a third passage through said ring into said mold cavity at a point remote from said second passage for venting said gas from said mold cavity, whereby said gas will travel across said mold cavity; and g. means for moving said sole plate toward and away from said one end.
Claim 2
Dependent Claim
187 words
In apparatus for molding a two colored sole into a tasted upper; a. a mold side ring for defining part of a mold cavity adapted to be closed at one end by a lasted upper; b. a sole plate slidably disposed in said mold cavity in close confronting relation with said side ring means; c. said sole plate having a surface for confronting said lasted upper and a side wall with a peripheral groove therewithin and a lip thereon between said lasted upper confronting surface and said groove, said lip extending toward and into close proximity with said side ring; d. a first passage through said ring into said mold cavity for introducing rubber therewithin, e. a second passage through said ring into said mold cavity for introducing gas at high velocity into said mold cavity; f. a third passage through said ring into said mold cavity at a point remote from said second passage for venting said gas from said mold cavity, whereby said gas will travel across said mold cavity; and g. means for moving said sole plate toward and away from said one end.
Claim 3
Dependent Claim
35 words
The apparatus of claim 1, wherein the mold cavity ends of said second and third passages are substantially coplanar and disposed further from said one end than the mold cavity end of said first passage.
Claim 4
Dependent Claim
23 words
The apparatus of claim 1, further comprising a fourth passage through said ring into said mold cavity for introducing a second rubber therewithin.
Claim 5
Dependent Claim
46 words
The apparatus of claim 2, wherein the mold cavity end of said fourth passage is closer to said one end than the mold cavity ends of said second and third passages and farther from said one end than the mold cavity end of said first passage.
Claim 6
Dependent Claim
66 words
The apparatus of claim 4, wherein said sole plate is movable to and from a remote position further from said one end than said second and third passages and from and to a close confronting position in which said lasted upper confrOnting surface is not closer to said one end than said first passage nor as far away from said one end as said fourth passage.