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A home yogurt making machine includes: a housing, an inner incubator thermally insulatively mounted in the housing, and a heating device having a positive-temperature-coefficient (PTC) semiconductor heating element mounted on a bottom of the inner incubator for smoothly heating the incubator, with t

A home yogurt making machine includes: a housing, an inner incubator thermally insulatively mounted in the housing, and a heating device having a positive-temperature-coefficient (PTC) semiconductor heating element mounted on a bottom of the inner incubator for smoothly heating the incubator, with the inner incubator having an internal chamber for directly storing a milk bottle or a soybean milk bottle in the incubator for conveniently forming yogurt at home.

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A home yogurt making machine includes: a housing, an inner incubator thermally insulatively mounted in the housing, and a heating device having a positive-temperature-coefficient (PTC) semiconductor heating element mounted on a bottom of the inner incubator for smoothly heating the incubator, with t

A home yogurt making machine includes: a housing, an inner incubator thermally insulatively mounted in the housing, and a heating device having a positive-temperature-coefficient (PTC) semiconductor heating element mounted on a bottom of the inner incubator for smoothly heating the incubator, with the inner incubator having an internal chamber for directly storing a milk bottle or a soybean milk bottle in the incubator for conveniently forming yogurt at home. er and also in a second direction to permit the pressurized fluid to be exhausted from said main piston chamber; and c) a piston member movable in a reciprocating manner in said main piston chamber in response to movement by said spool members within their spool chambers, said piston having i) a first piston end and a second piston end, said first and said second piston ends defining, with said first and said second chamber ends, a first chamber and a second chamber, respectively, in said main piston chamber during reciprocation of said piston, ii) an annular groove along an outer periphery of the piston member between said first and second piston ends, said groove defining a movable annular piston chamber located in said main piston chamber between said first and said second chamber ends, iii) a first piston passage connecting said annular piston chamber to said first chamber and a second piston passage connecting said annular piston chamber to said second piston chamber; and iv) a first seal disposed circumferentially on the periphery of said first piston end and a second seal disposed circumferentially on the periphery of said second piston end, said first and second seals separating said annular piston chamber from said first and second chambers, respectively, d) wherein said first seal forms a first value in said first piston passage and said second seal forms a second valve in said second piston passage, such that while said piston reciprocates within said main piston chamber, said first valve and said second valve alternately exhaust said first and said second chambers into said annular piston chamber through first and second piston passages respectively. 4. The pneumatic motor according to claim 3, wherein said first and second seals are directional check valves that permit passage of air in only one direction into said annular piston chamber from said first and second chambers, respectively. 5. The pneumatic motor according to claim 4, wherein said first and second seals are "U"-ring seals located on either said of said annular piston chamber with said "U"-shaped portions facing each other. 6. The pneumatic motor according to claim 5, wherein said piston passages are created alternately through said "U"-rings of said first and said second seal as air passes from said first and second chambers, respectively, to said annular piston chamber. 7. A pneumatic motor, comprising: a) a motor body having a main piston chamber with opposed first and second chamber ends, two spool chambers in fluid communication with said main piston chamber each of said spool chambers having a closed end and an exhaust end that is at least partially open to exhaust through said motor body, an inlet for flowing a pressurized fluid into each of the two spool chambers, an outlet provided in the housing for exhausting the pressurized fluid from said main piston chamber and each of the two spool chambers, wherein each spool chamber has a respective spool member located therein; b) each spool member having a large diameter end located proximate said closed end of its respective spool chamber and a small diameter end located proximate the exhaust end of its respective spool chamber, said large diameter end being greater in diameter than said small diameter end, and being adapted to be movable in a first direction to permit pressurized fluid to be supplied to said main piston chamber and also in a second direction to permit the pressurized fluid to be exhausted from said main piston chamber; c) a piston member movable in a reciprocating manner in said main piston chamber in response to movement by each of said spools within their spool chambers, said piston having a first piston end and a second piston end and an annular groove along an outer periphery of the piston member between said first and second piston ends, said groove defining a movable annular piston chamber located in said main piston chamber between said first and said second