FI63820C - LAOSNINGSSYSTEM - Google Patents

Description

63820

LOCKING SYSTEM - LÄSNINGSSYSTEM

The invention relates to a locking system having a mating surface with a mating surface and a rod-operated unidirectional screw or the like having a transmission surface only for the direction of tightening of the screw and a support surface having at least one discontinuity for transmitting the screw tightening force with the point of discontinuity of the support surface forms a pair of surfaces which prevents or considerably makes it more difficult for the screw to rotate in the detachable direction.

Especially in the fastening of the lock parts, a lot of so-called one-way screws with transmission surfaces only for tightening the screw. The intention is that neither the screw nor the part of the lock attached to it could be removed without special tools. In practice, however, it has been shown that a conventional unidirectional screw cannot effectively prevent improper removal of the locking parts, since these screws can be removed, for example, by tapping the screw with a sharp tool in the opening direction. In addition, known unidirectional screws, like ordinary screws, can come loose due to vibration.

It is an object of the invention to provide a locking system which, better than a conventional one-way screw, is secured against unwanted detachment or improper detachment. The invention is characterized in that said abutment surface is in a fixed abutment and is preferably substantially conical in shape, and that the support surfaces transmitting the axial tightening force of both the screw and the abutment are similar in shape and dimension and are provided with a plurality of, preferably three or four axially discontinuities. on a stop surface, which are arranged to slide past each other in the direction of the tightening movement of the screw and whose anti-tightening effect of the screw is negligible compared to the anti-tightening effect of 2,63820.

For manufacturing reasons, it is most advantageous to make the stop pin extensions substantially parallel to the axial plane of the locking screw. The pair of non-detachable surfaces may advantageously consist of axial stop surfaces having a screw surface or the like on both sides with a slight rise which resists the tightening movement of the screw. If this rise is made small enough, the detrimental effect of the system on the tightening of the screw will be almost non-existent. In order to achieve a uniform load pattern, it is advisable to use several pairs of stop surfaces, preferably three or four, which form a regular pattern on the screw base in the transmission surface and in the corresponding support surface.

The invention will now be described in more detail with reference to the accompanying drawing, in which Figure 1 shows a side view of a screw according to the invention, Figure 2 shows a perspective view of a counter-piece of the screw of Figure 1.

In the drawing, 1 screw and 2 screw counterparts are meant. The screw has a threaded shank part 3 and a conical base 4, as well as conventional transmission surfaces 5 of a one-way screw for tightening the screw 1. The conical surface of the screw head 4 has four axial and radial stop surfaces 6 and the mating piece has corresponding stop surfaces 7. Between the stop surfaces there is a slightly rising conical surface 8.

When the screw 1 is tightened, the screw surfaces 8 of the support surfaces of the base and the mating piece slide against each other and the stop surfaces 6 and 7 do not prevent the screw from rotating in this direction of rotation. When the screw 1 is tightened, it remains very firmly in place because the stop surfaces 6 and 7 prevent

Claims (5)

3 63820 Turn screw 1 in the detachable direction. The invention is not limited to the embodiment shown, but several variations of the invention are conceivable within the scope of the appended claims. A locking system with a mating piece (2) with a mating surface (7, 8) and a shank (3) »a one-way screw (1) or the like which can be tightened by turning, the base (4) of which has transmission surfaces (5) only for the tightening direction of the screw (1); a support surface (6,8) comprising at least one discontinuity (6) for transmitting the tightening force of the screw (1) to the abutment surface (7.8) of the mating piece (2) having at least one discontinuity (7) cooperating with the disc (1) of the screw (1) forming a pair of surfaces (6,7) which prevents or considerably makes it more difficult for the screw (1) to rotate in the detachable direction, characterized in that said abutment surface (7.8) is in a fixed abutment (2) and is preferably substantially conical in shape, and that both the screw (1) ) that the axial clamping force transmission surfaces (8) of the mating piece (2) are similar in shape and dimension and are provided with a plurality of, preferably three or four discontinuous with a predominantly axial stop surface (6,7) formed in the direction of the tightening movement of the screw (1), which is arranged to slide past each other, and whose anti-tightening effect of the screw (1) is negligible compared to their anti-loosening effect of the screw (1). System according to Claim 1, characterized in that the stop surface (6) of the screw head (4), the axial dimension of which corresponds to the conical part of the head (4), and the stop surface (7) of the mating piece (2) are essentially 1) parallel to the axial plane. System according to Claim 1 or 2, characterized in that on both sides of the axial stop surfaces (6, 7) the abutment surface or the support surface is formed as a slightly sloping screw surface (8), its single screw surface (8) is arranged to move away from the central axis of the screw (1). M. A system according to any one of the preceding claims, characterized in that said stop surfaces (6.7) are arranged at regular distances on the support surface (8) and the abutment surface (8). 1. A system for the operation of an anti-inflammatory system (7,8) for a number of motors (2), for example, for the production of a single screw (1) or for a single-phase screw (1) or for the purpose of weighing (4) for self-cleaning and scraping (1) for self-cleaning and forging (6) for self-cleaning (6.8) for self-cleaning (1) ), which is based on discount points (6) and screws (1) on the basis of a picture and a pair (6,7), on the basis of the value of the screws (1) and on the value of the screws (1) , 8) the belts and detectors (2) and the shape of the headforms are used in the form of a conveyor belt (8) and the headforms (8) and the shape of the motors (2) account you dimensioner oc h är försedda med ett flertal,