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A clamshell case includes a case bottom, at least one modular intermediate layer, and a lid. The intermediate layer has a coupling slot in an upper back thereof and a pivot block at a lower back thereof. The pivot block is held in a pivot slot of the case bottom, and the intermediate layer is pivota

A clamshell case includes a case bottom, at least one modular intermediate layer, and a lid. The intermediate layer has a coupling slot in an upper back thereof and a pivot block at a lower back thereof. The pivot block is held in a pivot slot of the case bottom, and the intermediate layer is pivotally fitted over the case bottom through at least one pivot or a pivot portion. The lid has a pivot block held in the coupling slot of the intermediate layer and is pivotally fitted over the intermediate layer through at least one pivot or a pivot portion. The costs to manufacture the clamshell case, which is assembled with a specific number of modular intermediate layers stacked on one another as required, can be reduced, because pivot blocks in all modular intermediate layers are of equal height and identical axial position.

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1. A clamshell case comprising: a case bottom including a bottom plate and a wall plate extending upward from an edge of the bottom plate, with a pivot slot having a shape and size and formed in an upper back of the wall plate, with two opposite pivot holes provided in the wall plate and located at

1. A clamshell case comprising: a case bottom including a bottom plate and a wall plate extending upward from an edge of the bottom plate, with a pivot slot having a shape and size and formed in an upper back of the wall plate, with two opposite pivot holes provided in the wall plate and located at two sides of the pivot slot;at least one intermediate layer pivotally fitted over the case bottom, with the at least one intermediate layer including a seat board and an enclosure extending upward from an edge of the seat board, with a coupling slot having a shape and size and formed in an upper back of the enclosure, with two opposite pivot holes provided in the enclosure and located at two sides of the coupling slot, with the shape and size of the pivot slot being identical to the shape and size of the coupling slot, with a layer pivot block having a shape and size and protruding from a lower back of the enclosure and including a transverse pinhole therein, with the shape and size of the layer pivot block corresponding to and slideably and pivotally received in the pivot slot, with the layer pivot block of the at least one intermediate layer held in the pivot slot of the case bottom, with two bottom pivots respectively penetrating the pivot holes of the case bottom into the transverse pinhole of the at least one intermediate layer; anda lid pivotally fitted over the at least one intermediate layer and including a cover plate and a wall plate extending downward from an edge of the cover plate, with a lid pivot block having a shape and size and protruding from a lower back of the wall plate of the lid and including a transverse pinhole therein, with the shape and size of the lid pivot block being identical to the shape and size of the layer pivot block, with the shape and size of the lid pivot block corresponding to and slideably and pivotally received in the coupling slot, with the lid pivot block of the lid held in the coupling slot of the at least one intermediate layer, with two lid pivots respectively penetrating the pivot holes of the at least one intermediate layer into the transverse pinhole of the lid. 2. The clamshell case according to claim 1, wherein the at least one intermediate layer includes a plurality of intermediate layers, with the layer pivot block of one of the plurality of intermediate layers held in the coupling slot of another one of the plurality of intermediate layers, wherein the one of the plurality of intermediate layers is stacked on and pivotally fitted at the other one of the plurality of intermediate layers with two layer pivots respectively penetrating the pivot holes of the other one of the plurality of intermediate layers into the transverse pinhole of the one of the plurality of intermediate layers. 3. The clamshell case according to claim 2, wherein the layer pivot blocks of the plurality of intermediate layers are of equal height and identical axial position. 4. The clamshell case according to claim 1, wherein the transverse pinhole of the at least one intermediate layer is aligned with the two opposite pivot holes of the case bottom. 5. A clamshell case comprising: a case bottom including a bottom plate and a wall plate extending upward from an edge of the bottom plate, with a pivot slot having a shape and size and formed in an upper back of the wall plate, with a pivot portion provided in the pivot slot of the case bottom;at least one intermediate layer pivotally fitted over the case bottom, with the at least one intermediate layer including a seat board and an enclosure extending upward from an edge of the seat board, with a coupling slot having a shape and size and formed in an upper back of the enclosure, with a pivot portion provided in the coupling slot, with a layer pivot block protruding from a lower back of the enclosure and including a transverse through-hole therein, with the shape and size of the pivot slot being identical to the shape and size of the coupling slot, with the layer pivot block of the at least one intermediate layer held in the pivot slot of the case bottom, with the transverse through-hole of the at least one intermediate layer pivotally fitted at the pivot portion of the case bottom; anda lid pivotally fitted over the at least one intermediate layer and including a cover plate and a wall plate extending downward from an edge of the cover plate, with a lid pivot block having a shape and size and protruding from a lower back of the wall plate of the lid and including a transverse through-hole therein, with the shape and size of the lid pivot block being identical to the shape and size of the layer pivot block, with the shape and size of the lid pivot block corresponding to and slideably and pivotally received in the coupling slot, with the lid pivot block of the lid held in the coupling slot of the at least one intermediate layer, with the transverse through-hole of the lid pivotally fitted at the pivot portion of the at least one intermediate layer. 6. The clamshell case according to claim 5, wherein the at least one intermediate layer includes a plurality of intermediate layers, with the layer pivot block of one of the plurality of intermediate layers held in the coupling slot of another one of the plurality of intermediate layers, wherein the one of the plurality of intermediate layers is stacked on and pivotally fitted at the other one of the plurality of intermediate layers with the pivot portion of the other one of the plurality of intermediate layers engaged in the transverse through-hole of the one of the plurality of intermediate layers. 7. The clamshell case according to claim 6, wherein the layer pivot blocks of the plurality of intermediate layers are of equal height and identical axial position.