SCREW-AND-NUT JOINT

Abstract: Screw-nut-joint of the kind, which comprises a nut (12) that is equipped with an axial slot (18), forming an open ring. The nut is at one of its ends provided with a conical extension (16), for cooperation with a corresponding conical recess (17) in a washer (13), construction part (14) or the like. The nut has a peripheral extension that exceeds 180 . The width of the slot is somewhat smaller than the diameter of the screw. The nut is produced of an elastic material, which allows the nut to be snapped-on and off the screw, via the slot.

Description: SCREW-AND-NUT-JOINT The present invention refers to a screw-nut-joint of the kind, which comprises a self-locking nut, which is quickly disengagable from a screw. BACKGROUND OF THE INVENTION Lock-nuts of the initially mentioned kind are known, for instance through CH 141119-C, GB 371,109-C and WO 88/01024- Al. Common for these is that the conical projection of the slotted nut in cooperation with a corresponding conical recess in a washer or other machine part is exposed to a radial clamping effect, which makes the nut being clamped thereby being locked to the screw. In many applications is required a proportionately long screw to cover different occurring thicknesses of the part that the screw-nut-joint shall join. This implies that, with insignificant thicknesses, the lock-nut must be relocated a relatively long distance along the screw, which, specially when the nut is difficult to access, is a troublesome and time-consuming procedure. THE PURPOSE AND MOST IMPORTANT FEATURES OF THE INVENTION The purpose of the present invention is to provide a screw-nut-joint, where the nut can be quickly relocated to an operative position along the screw, without deteriorating the lock function of the nut on the screw. These tasks have been solved in that the nut is provided with an axial slot extending through the wall of the nut itself, that the wall of the nut has a peripheral extension, somewhat extending 180°, that the width of the slot is somewhat smaller than the diameter of the screw, that the nut is produced of an elastic material that allows the nut to be snapped on and off the screw via the slot, that the nut at one of its ends is equipped with a conical extension for cooperation with a corresponding conical recess in a washer, construction part or the like and that the taper of the extension and the washer is so chosen, that when the nut is tightened a pressure acts from the wall of the nut around the screw. DESCRIPTION OF THE DRAWINGS Below the invention will be described closer with reference to embodiments with reference of the drawings. Figure 1 discloses partly in cross-section the screw-nut- -joint according to the invention. Figure 2 is a cross-section along the line II-II in fig. 1. Figure 3 reveals in perspective a modified embodiment of the lock-nut. DESCRIPTION OF EMBODIMENTS The screw-nut-joint 10 according to the invention includes a screw 11, a nut 12, a washer 13 and a construction part 14, which is included in the design to be jointed by the screw-nut-joint. The screw 11 is of conventional type and equipped with outer threads 15. The nut 12 is at one of its ends equipped with a conical extension 16, which cooperates with a corresponding conical recess 17 in the washer 13. The nut and its extension are provided with an axial slot 18 so that these parts form an open ring. This surrounds the screw circumferentially over somewhat more than 180°, while the width of the slot is somewhat smaller than the screw's outer diameter, while the taper in the extension 16 and the washer is so determined that when the nut is tightened a pressure from the wall of the nut is received around the screw. The nut is produced of an elastic material, which has the characteristic to return to original form, when the form - altering forces cease to act. Such material is suitably plastic or the like. The shanks of the open ring are consequently elastic, which means that the nut can be snapped on or off the screw in proper position along the screw. Consequently one does not need to screw the nut in a proper position, but can snap it on and off in appropriate place. The nut can of course have different designs, for instance hexagonal such as shown in figures 1 and 2 or be designed as a wing nut, such as shown in figure 3 or some other way. Even the conical recess can be arranged separately in a washer, such as shown in figure 1, but it can also be arranged directly on the construction part, if it is appropriate. The invention is not limited to the shown embodiments, but several variations are conceivable within the scoop of the claims. The reference numeral CLAIMS 1. Screw-nut-joint of the kind, which comprises a self locking-nut (12), which is quickly disengagable from a screw (ID, c h a r a c t e r i z e d i n, that the nut (12) is equipped with, an axial slot (18) extending through the wall of the nut itself, that the wall of the nut (12) has a peripheral extension, which somewhat exceeding 180°, that the width of the slot (18) is somewhat smaller than the diameter of screw (11), that the nut (12) is produced of an elastic material, which allows the nut to be snapped-on and off the screw via the slot, that the nut at one of its ends is equipped with a conical extension (16) for cooperation with a corresponding conical recess (17) in a washer (13), construction part (14) or the like, and that the taper of the extension (16) and the washer (13) is so chosen, that when the nut is tightened a pressure from the wall of the nut is received around the screw. 2. Screw-nut-joint according to claim 1, characterized in, that the nut (12) is a wing nut.

Claims: AMENDED CLAIMS [received by the International Bureau on 28 January 1994 (28.01.94); original claim 1 amended; other claims unchanged (1 page)] 1. Screw-nut-joint of the kind, which comprises, onto a screw (11), quickly engegable and disengagablβ nut (12), which is equipped with, an axial slot (18) extending through the wall of the nut itself, having a peripheral extension, which somewhat exceeding 180", and the width of the slot (IB) is somewhat smaller than the diameter of the screw (11)/ characterized in, that the nut (12) is produced of an elastic plastic material, having property of substantially regaining its original form, when the form altering forces cease, and which allows the nut to be snapped on and off the screw via the slot, that the nut at one of its ends is equipped with a conical extension (16) for cooperation with a corresponding conical recess (17) in a washer (13), construction member (14) or the like, that the taper of the extension (16) and the washer (13) is so chosen, that when the nut is tightened a pressure from the wall of the nut is received around the screw, and that the nut (12) is a wing nut.

Inventors: LARSSON NILS, LARSSON, NILS
Applicants: ARROW PLASTIC AB, LARSSON NILS
Application year: 1993
Main classification: F16B37
IPC codes: A47K13, F16B37