A clamping device for a closure part of a box, particularly for distribution boxes with disposi-tive electrical control

摘要

1. A fastening device for a closure part of a box, particularly for distribution boxes with electrical control devices, with at least one threaded member attachable by screwing to the housing and, by means of a stopper in stem through the closure part, is fastened undetachably to said closing portion, each threaded member extending through a depression in the surface of the closure part in which between a projection of the screw element and the bottom of the depression, is disposed a biasing spring compression, characterized in that the rod (18) of the threaded element (15) configured as a stem nut, passing through the bottom (28) the bottom (28), it is equipped outside the depression (26) a clamping surface (36), the closure part (11) being supported against the housing (2) and connected state by screwing, against the force of the compression spring, a threaded shank (19) sun idaria box, is supported against a structural member (connecting circuit board (6) resting against a supportive abutment (20) of the housing and is centered by a centering element (21) set directly in front of the counter, in setscrew. 2. A clamping device according to claim 1, characterized in that it has, for a portion of the threaded shank (19), a threaded bolt (22) projecting freely, and moreover, the threaded member (15) mode stem nut, an opening (24) hollow cylinder which embraces the centering element (21), in the area of ​​the clamping surface (36), in axial and radial direction and with clearance, and a straight hole, associated the threaded bolt (22) and provided with a thread (25). 3. A device according to claims 1 or 2, wherein the threaded member (15) is provided on its outer side of a cylindrical head (16) whose diameter is only slightly smaller than the diameter of the depression (26) configured cylindrical, at least in the associated zone. 4. A device according to any one of claims 1 to 3, characterized in that the distance between the stop (31) on the stem (18) is less than the distance between the outer surface (27) of the closure part (11 ) and side (28) of the bottom (28) of the recess, facing the interior of the housing (2). 5. A device according to any one of claims 1 to 4, with a closure part placed on the box, but not screwing the clamping device, characterized in that the distance (a) between the thread (25) and the side top of the constructive part, turned towards it, is somewhat greater than the distance (Aj) associated between the start of the thread of the threaded bolt (22) and the upper side of the structural member. 6. A device according to any one of claims 1 to 5, with a closure part placed on the box, but not screwing the clamping device, characterized in that the distance (a¿¿) between the clamping surface (36 ) and the upper side of the construction part, turned towards it, is somewhat smaller than the distance (Aj) between the beginning of the thread of the threaded bolt (22) and the upper side of the structural member. 7. A device according to any one of claims 1 to 6, with the closing part mounted on the housing and the threaded member threadingly connected, wherein the distance between the projection (29) of the threaded element (15) and the back side of the bottom 828) of depression is somewhat greater than the length of compression spring package. 8. A clamping device for a closure part of a box, particularly for distribution boxes with electrical control devices.