Earring or brooch back

An earring or brooch back for receiving a post which is provided with at least one groove, comprising:

• a housing comprising a bottom shell and a top shell, wherein the bottom shell and the top shell are provided with mutually aligned openings for forming a passage for the post;
• a first and a second pressing element between the bottom shell and the top shell, wherein the first pressing element is provided with a first stop for the post and a first protruding part which protrudes from the housing, wherein the passage lies between the first stop and the first protruding part, and wherein the second pressing element is provided with a second stop for the post and with a second protruding part which protrudes from the housing, wherein the passage lies between the second stop and the second protruding part, wherein the first and second stop lie on either side of a post to be inserted;
• and
• at least one spring for spring-mounting the first and second pressing element;
• wherein the bottom shell is formed on an inner side with a first internal guide part for guiding the first pressing element and with a second internal guide part for guiding the second pressing element, wherein the first and second internal guide part lie on either side of the passage for the post;
• and
• wherein the first internal guide part has a first guide wall which is parallel to a second guide wall of the second internal guide part, and wherein a direction of the first and second guide walls is parallel to a pressing direction in which the first and second pressing element are movable, said pressing direction extending between the first and second protruding part and being perpendicular to an axis of the passage.

An earring or brooch back for receiving a post which is provided with at least one groove, comprising:

• a housing comprising a bottom shell and a top shell, wherein the bottom shell and the top shell are provided with mutually aligned openings for forming a passage for the post;
• a first and a second pressing element between the bottom shell and the top shell, wherein the first pressing element is provided with a first stop for the post and a first protruding part which protrudes from the housing, wherein the passage lies between the first stop and the first protruding part, and wherein the second pressing element is provided with a second stop for the post and with a second protruding part which protrudes from the housing, wherein the passage lies between the second stop and the second protruding part, wherein the first and second stop lie on either side of a post to be inserted;
• and
• a single spring for spring-mounting the first and second pressing element;
• wherein the spring has a first spring-mounted leg and a second spring-mounted leg extending substantially along a V-shape or a U-shape around the passage;
• wherein the first and the second pressing element are provided with, respectively at least a first and a second guide wall against which the first spring-mounted leg and the second spring-mounted leg act for the purpose of pressing respectively the first and second protruding part outward, and
• wherein the bottom shell is formed on an inner side with a first internal guide part for guiding the first pressing element and with a second internal guide part for guiding the second pressing element, wherein the first and second internal guide part lie on either side of the passage for the post.