Method for the attachment of tubular pipe connection means to a sheet metal Wall and a device according to the method

A method of attaching a tubular pipe connection means to a sheet metal wall, such as a storage tank or similar structure, in which an end portion of the pipe connection means attachable to the sheet metal wall is provided with an inwardly inclined conical collar having at its free end portion an outwardly directed conical flange member;

• comprising the steps of providing a bar with a conically-shaped free end portion;
• inserting the movable bar into the pipe connection means so that the free end portion thereof contacts the inside of the collar of the pipe connection means;
• attaching a conical hole piercing member to the free end portion of the bar in contact with the inside of the flange member;
• moving the hole piercing member together with the pipe connection means axially through the sheet metal wall so that the conical collar and flange member, by means of the conically-shaped free end portion of the bar are pressed outwardly and caused to bend and grip the edge portion of the hole formed through the sheet metal wall by means of the piercing member;
• and sliding the bar in the opposite direction for removing together with the hole piercing member.