Claims
- 1. Pressure molding means for powder comprising a fixed bed, a vertically reciprocated pressure ram having an active face of predetermined shape and size, a pressure submissive block having a passive face which faces against and in a coaxial relation with said active face and which has a shape and size equal to that of said active face, one of said active face and said passive face being positioned below the other and comprising a powder supporting face, means to move said active face and said passive face to compress therebetween powder fed on said powder supporting face, a vertical sleeve positioned in coaxial relation to said active face and said passive face and provided with a bore of a cross section of a shape and size equal to that of said active face, said vertical sleeve having an upper end edge which is level with said powder supporting face during a powder feeding operation and which, upon completion of said feeding operation, is moved upwardly through a powder layer spread on said supporting face to form, by means of the upper end portion of said vertical sleeve, a peripheral wall means for said supporting face, means to move said passive face slidably through said fixed bed, a powder feeder spaced from said powder supporting face, said powder feeder comprising a hopper carrying a predetermined amount of powder for one feeding operation and a feeding orifice of cross sectional size smaller than the cross sectional size of said powder supporting face, and means to reciprocate said powder feeder laterally at a constant velocity along a level between said active and said passive face to discharge and spread a layer of powder of predetermined thickness and uniform density on and across said powder supporting face.
- 2. Pressure molding means for powder as claimed in claim 1 in which, each of one of said pressure ram and said pressure-submissive block is a block having a uniform cross section so that the total area of the end face of each said block facing each other forms respectively said active face or said passive face, said pressure ram is positioned lower than said pressure-submissive block so that said powder supporting face is formed by said active face, and said vertical sleeve surrounds said pressure ram so that said axial bore of said vertical sleeve receives the end portion of said pressure-submissive block upon upward stroke of said vertical sleeve.
- 3. Pressure molding means for powder as claimed in claim 1 in which, each of one of said pressure ram and said pressure-submissive block is a block having a uniform cross section so that the total area of the end face of each said block facing each other forms respectively said active face or said passive face, said pressure-submissive block is positioned lower than said pressure ram so that said powder supporting face is formed by said passive face, and said vertical sleeve surrounds said pressure-submissive block so that said axial bore of said vertical sleeve may receive the end portion of said pressure ram upon downward stroke of said pressure ram.
- 4. Pressure molding means for powder as claimed in claim 1 in which, said pressure ram is a block having a cross section so that the whole area of the end face of said block forms said active face, said pressure-submissive block is a block having an end face of a size which is larger than said active face, the central portion of said end face of said submissive block forming said passive face, said pressure ram is positioned lower than said submissive block so that said powder supporting face is formed by said active face, and said vertical sleeve surrounds said pressure ram so that the end edge of said vertical sleeve engages said end face of said submissive block and so that the axial bore end coincides with said passive face upon upward stroke of said vertical sleeve.
- 5. Pressure molding means for powder comprising a pressure ram having an active face of a shape and a size which correspond to the plan figure of an objective molded body and being reciprocated vertically, a pressure-submissive block having a passive face which faces against and in a coaxial relation to said active face and which has a shape and a size equal to those of said active face, either one of said active face and said passive face which is positioned lower than the other serving as a powder supporting face, said active face and said passive face compressing therebetween powder fed on said powder supporting face, a vertical sleeve positioned in a coaxial relation to said active face and said passive face and provided with an axial bore of a cross section of a shape and a size equal to those of said active face and said passive face, and a powder feeder having a feeding orifice which, upon feeding operation of said powder feeder, is reciprocated laterally at a constant velocity along a level between said active face and said passive face and at a distance apart from said powder supporting face, said powder supporting face, upon feeding operation of said powder feeder, positioned free from any peripheral wall means for said powder supporting face, and said vertical sleeve reciprocated vertically so that the end edge of the same, upon completion of said feeding operation of said powder feeder, passes the level of said powder supporting face and crosses the powder layer formed thereon and so that the end portion of the same forms a peripheral wall means for said powder supporting face, each of one of said pressure ram and said submissive block being a block having uniform cross section so that the total area of the end face of each said block each facing to each other forms respectively said active face or said passive face, said pressure-submissive block positioned lower than said pressure ram so that said powder supporting face is formed by said passive face, said pressure-submissive block including a follower sleeve slideably positioned around said submissive block and supported resiliently from below so that the end edge of said follower sleeve keeps the level of said powder supporting face, said vertical sleeve surrounds said pressure ram so that the end edge of said vertical sleeve engages the end edge of said follower sleeve so that said follower sleeve is pushed and lowered by said vertical sleeve and the end portion of said pressure-submissive block is received in said axial bore of said vertical sleeve upon downward stroke of said vertical sleeve.
Priority Claims (1)
Number |
Date |
Country |
Kind |
62-148740 |
Jun 1987 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/206,771, filed June 15, 1988, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (9)
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DEX |
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DEX |
57-25911 |
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JPX |
59-67006 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
206771 |
Jun 1988 |
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