Separable capsule

A two-piece releasable hard capsule comprising:

• a first part having an open end, a closed end, insertion axis, and a first connection unit comprising:
• an inner wall defining a first cavity;
• a prelock area;
• and
• a lock area, wherein at east part of the lock area is located between the prelock area and the dosed end;
• and
• a second part having a second connection unit comprising:
• an outer wall which is insertable into the first cavity generally along the insertion axis through the open end;
• and
• an engagement area configured to engage with the prelock area when the outer wall is partially inserted in the first cavity to form a first releasable connection between the first part and the second part, and
• wherein the engagement area is configured to engage with the lock area when the outer wall is fully inserted in the first cavity to form a second releasable connection between the first part and the second part, preferably wherein the first releasable connection requires a first force to release and the second releasable connection requires a second force to release, preferably wherein the ratio of the first force to second force is from about 0.15 to about 0.35, preferably from about 0.1 to about 0.2, wherein the prelock area comprises a plurality of first coupling elements, the lock area comprises a plurality of second coupling elements, and the engagement area comprises a third coupling element,
• wherein at least one of the second coupling elements has a restriction edge generally perpendicular to the insertion axis, wherein the restriction edge is configured to restrict insertion depth when inserting the second part into the first part and engaging the first releasable connection, and wherein at least one of the plurality of first coupling elements and the plurality of second coupling elements comprises a protrusion having an elongated shape comprising an elongated axis running parallel to an insertion axis and comprising a restriction edge perpendicular to the insertion axis.