Fastening device for detachable joining a connecting element and at least one elongated part by means of a screwed connection

Claim 2

In a fastening device for detachably joining, with the aid of screwed connections, a connecting element and at least one elongated part having a longitudinal cavity which is open over at least some distance to that end of said part where the joint is to be established and which is lateraLly defined by at least two opposed walls of said elongated part, an opening which is separated from that end of said part where the joint is to be established, a butting member fitting between said walls and engaging the edge surface of said opening by the intermediary of a shoulder which protrudes beyond said edge surface, said butting member having a through hole directed towards the open end of said part, and a screw insertible in said hole and tightenable through said opening, the screwed connection connecting the butting member and the connecting element and, when tightened, pulling the butting member and consequently the elongated part towards the connecting element, said butting member and said screw being retained in the elongated part by means of a pin which is inserted through aligned holes in one side wall and said butting member transversely of said through hole therein, said pin extending into an annular groove in the periphery of the screw, the width of said groove being such that the apex of said screw is retractible flush with the mouth of said through hole in said butting member.

Claim 3

A fastening device for detachably joining, with the aid of screwed connection, an upright having at least one engageable edge and at least one elongated part having a longitudinal cavity which is open over at least some distance to that end of said part where the joint is to be established and which is laterally defined by at least two opposed walls, said device comprising, in at least one of the opposed walls of said elongated part, an opening which is spaced from that end of said part where the joint is to be established, a butting member fitting between said walls and engaging the edge surface of said opening by the intermediary of a shoulder on said butting member which protrudes beyond said edge surface, said butting member having a through hole directed towards the open end of said part, and a screw insertible in said hole and tightenable through said opening, said screw at that end of the elongated part where the joint is to be established having hook means engageable with said edge, and being tightenable by means of a nut which is accessible through said opening in the elongated part, the screwed connection connecting the butting member and the upright end, when tightened by means of said nut, pulling the butting member and, as a consequence, the elongated part towards the connecting element, characterized in that the hook means comprises two parallel metal plates which are fixed as by welding to one end of the screw and each have two hooks for engagement with one edge.

Claim 4

A fastening device for detachably joining, with the aid of screwed connection, an upright having at least one engageable edge and at least one elongated part having a longitudinal cavity which is open over at least some distance to that end of said part where the joint is to be established and which is laterally defined by at least two opposed walls, said device comprising, in at least one of the opposed walls of said elongated part, an opening which is spaced from that end of said part where the joint is to be established, a butting member fitting between said walls and engaging the edge surface of said opening by the intermediary of a shoulder on said butting member which protrudes beyond said edge surface, said butting member having a through hole directed towards the open end of said part, and a screw insertible in said hole and tightenable through said opening, said screw at that end of the elongated part where the joint is to be established having hook means engageable with said edge, and being tightenable by means of a nut which is accessible through said opening in the elongated part, the screwed connection connecting the butting member and the upright end, when tightened by means of said nut, pulling the butting member and, as a consequence, the elongated part towards the connecting element, characterized in that the hook means comprises two parallel metal plates which are fixed as by welding to one end of the screw and each have two hooks for engagement with one edge.

Claim 5

A device as claimed in claim 1, characterized in that the openings in the side walls of the elongated part are sufficiently large to permit insertion of the butting member, and said butting member has a stud which fits a recess in the connecting element for preventing relative rotation between the connecting element and the elongated part.

Claim 6

A device as claimed in claim 2, characterized in that the butting member is in the form of a sleeve fitting in the opening in the elongated part.