TECHNICAL FIELD

The invention relates to a device for the adjustable fastening of door or window frames or the like to fixed elements, including a screw means provided with threads for engagement with the fixed element and a sleeve-shaped part provided with threads for engaging with the frame part.

BACKGROUND ART

Devices of the type mentioned are already known, e.g. from the Swedish patent No 216.085. In this known fastening means, the threaded screw means has a further thread on to which a sleeve is screwed, the sleeve in turn being provided with an exterior thread for engaging with the frame. The sleeve and screw means can be turned together with the aid of a tool, so that the sleeve will penetrate into the frame and the screw means into the fixed element, and the sleeve can also be turned by itself with the aid of another tool for adjusting the position of the frame in relation to the fixed element.

This known device enables a desired adjustment but necessitates pre-boring holes with two different diameters, the production of three different threads and the formation of engagement surfaces for two different tools. The production and the preparatory work on erection will consequently be relatively expensive.

DISCLOSURE OF INVENTION

The object of the invention is to provide a fastening device of simple construction which furthermore only necessitates pre-boring holes of a single dimension. This is provided by the sleeve-shaped part being arranged axially displaceable on the screw means so that in a first position it engages with the screw means to accompany the screw means in its turning movement, while in its second position it does not accompany the turning movement of the screw means.

BRIEF DESCRIPTION OF DRAWINGS

The invention will now be described below with the aid of an embodiment and with reference to the accompanying drawing, on which Figure 1 is a side view of the fastening device with the sleeve part in its engagement position. Figure 2 illustrates the fastening device partially in section when the sleeve part is not in engagement with the screw means,

Figure 3 illustrates the screw head, seen in the direction of the arrow A and Figure 4 illustrates the sleeve part in the direction of the arrow B.

BEST MODE FOR CARRYING OUT THE INVENTION

The inventive fastening device is illustrated in Figures 1 and 2 in side view and in a partially sectioned side view, respectively. A screw means is denoted by the numeral 1 and is provided with a thread portion 2 for screwing into a fixed element 3, with a screw head 4 and with a smooth cylindrical portion 5 between the screw head and a shoulder 6. On the smooth part 5 there is arranged a sleeve 7 provided with a thread 8, which can be displaced between the shoulder 6 and the screw head 4. The sleeve 7 arid the head 4 are implemented at their contiguous surfaces such that when the screw head is turned in one direction, e.g. clockwise, the sleeve is taken with it, whereas if it is turned in the opposite direction the sleeve 7 and head 4 glide against each other. According to one embodiment illustrated on the drawing, the sleeve 7 is provided with projections 9 on its end facing towards the screw head 4. These projections 9 engage in recesses 10 in the screw head and are formed such that on turning the screw head in one direction, e.g. clockwise, the sleeve accom¬ panies the head, while on turning in the other direction the edge 11 of the recess 10 glides along the sloping surface 12 of the projection so that the head 4 is lifted out of engagement with the sleeve part, and the screw means 1 can be turned without the sleeve 7 accompanying it. It is, however, just as possible to have the screw head provided with serrations and the sleeve with recesses having sloping defining surfaces.

On erection, the frame 13 and the fixed element 3 may be pre-bored to the same diameter. The screw means 1 is first driven through the hole in the frame 13 and then into the fixed element 3. The hole in the frame is expanded with

the aid of a conical portion 14 on the screw means so that on continued driving of the screw head the sleeve 7 is driven into the expanded hole. When the screw means has been driven in to a depth such that the frame is approximately in the desired position, adjustment takes place by the screw head 4 being turned anticlockwise. The sleeve 7 then does not accompany the screw means 1, but the latter is screwd out until the frame 13 has reached the desired distance from the fixed element. At the places where the distance between the frame and the fixed element is too great, the screw means is driven deeper into the fixed element.