Patent ID: 9145024
Filing Date: 2015-09-29
Classification: B43K,B65D,Y10T

Abstract:
1. An extendable and contractible housing, comprising: a first section extending longitudinally along an axis and having opposite first and second ends spaced apart along the axis, a plurality of first trapezoidal projections at the first end of the first section in an axial direction and spaced from one another in a direction transverse to the axial direction, each of the first trapezoidal projections having opposite side edges and a distal edge extending between the side edges, each of the first trapezoidal projections being gradually wider at positions closer to the distal edge, first trapezoidal recesses being defined between the first trapezoidal projections; a second section extending longitudinally along the axis and having opposite first and second ends, a plurality of second trapezoidal projections at the second end of the second section in the axial direction and spaced from one another in the direction transverse to the axial direction, each of the second trapezoidal projections having opposite side edges and a distal edge extending between the side edges, each of the second trapezoidal projections being gradually wider at positions closer to the distal edge, second trapezoidal recesses being defined between the second trapezoidal projections, wherein the first trapezoidal projections are engaged respectively in the second trapezoidal recesses and the second trapezoidal projections are engaged respectively in the first trapezoidal recesses, the first and second trapezoidal projections and the first and second trapezoidal recesses being dimensioned to permit limited axial movement of the first section relative to the second section and to prevent separation of the first and second sections.