FI79060C - Tow hitch with quick lock. - Google Patents

Description

79060

The present invention relates to a quick-release towbar according to the preamble of claim 1.

The number and use of passenger cars has been constantly growing. In addition to traditional passenger transport, the passenger car is increasingly being used as a towing vehicle, with the car being fitted with a towbar for the trailer. With a quick-release detachable towbar that is as light as possible, most transport needs can be met without compromising the car's appearance and public safety.

Towbars are already known which are equipped with a folding mechanism in which the hook is turned under the car. FI-A-72930 discloses a quick-locking traction hook in which the locking spring in the locking mechanism is immediately on the detachable hook part and follows the hook part after removal. The vertical lock is also the same piece as the hook part and is adapted to move immediately on top of it.

The disadvantage of the solution described in the FI announcement publication is that in its presented form the hook part becomes large and clumsy. Since the detachable hook part is most often stored in the trunk of the car, the hook structure with moving parts may be damaged during transport.

The object of the present invention is to obviate the disadvantages of the technique described above and to provide a completely new type of quick-release towbar.

The invention is based on the fact that the vertical lock is movable around the body part so that the spring force keeps the vertical lock in the locking position.

More specifically, the towbar according to the invention is characterized by what is set forth in the characterizing part of claim 1.

2 79060

The invention provides considerable advantages.

The hook part of the towbar according to the invention is light and easy to handle. The locking structure is made particularly durable and reliable by the fact that the detachable hook part does not contain moving parts.

The invention will now be examined in more detail by means of an application example according to the accompanying drawings.

Figure 1 shows a side view of the attachment of a towbar according to the invention to a car.

Figure 2a shows a side view of the hook part of a towbar according to the invention.

Fig. 2b shows an end view of the hook part of the towbar according to Fig. 2a seen from the direction of the end locking part.

Fig. 2c shows a cross-sectional end view of the hook part of the towbar according to Fig. 2a, seen from the direction of the end locking part s.

: Figure 3 shows a partial sectional view of the body.

Fig. 4a shows a partially sectioned side view of the hook part according to Fig. 2a connected to the corresponding body part.

Fig. 4b shows a cross-sectional view of the combination according to Fig. 4a at the vertical lock.

According to Figure 1, the towing hook according to the invention consists of a body part 6 and a hook part 1 to be attached to a car.

According to Fig. 2a, the L-shaped hook part 1 consists of a bent knob part 2 and a vertical locking flange 3, a neck part 4 and an end locking part 5 in a straight part. The end locking part 5 is formed by milling material on both sides of a hook part 1 of circular cross-section according to Fig. 2b, whereby the machined, opposite sides of the end locking part 5 are straight and parallel. The neck part 4, on the other hand, is turned narrower than the other hook part 1, for example to the smallest dimension of the end locking part 5 in diameter. Figure 2c shows a normal circular cross-sectional shape of the hook part 1.

According to Fig. 3, the body part 6 is a hollow body, the other end of which is closed by a dust cover 7. The cross-sectional shape of the outer surface of the open end of the body part 6 is square. The basic cross-sectional shape of the cavity 9 is a circle. In the vicinity of the dust cover 8, on opposite sides of the body part 6, grooves 10 extending into the cavity 9 are made, in which fastening plates 8 are welded, forming a slit-like constriction in the cavity 9 through which the end locking part 5 of the hook part 1 can fit. In the locking position, the end locking part 5 of the hook part 1 is locked axially between the part of the dust cover 7 and the fastening plates 8, whereby the fastening plates 8 receive the tensile stress caused by the hook part 1.

The attachment of the towbar is performed by inserting the hook part 1 into the cavity 9 of the body part in such a position that the end locking part 5 fits in the gap between the fastening plates 8. In this case, the knob part 2 of the hook part 1 must be in a horizontal position. The hook part 1 is then pivoted about its longitudinal axis into the transport position, whereby the end locking part 5 locks behind the fastening plates 8. Now the knob part 2 is in a vertical position. According to Fig. 4a, the hook part 1 is locked vertically on the surface of the body part 6 by a sleeve-moving vertical lock 11. The cross-sectional shape of the inner surface of the sleeve-like vertical lock 11 corresponds to the cross-sectional shape of the vertical lock flange 3. . The body part 6 is provided with a spring 12 which pushes the vertical lock 11 to the locking position. The body part 8 can also be provided with a spring protective

Claims (3)

4,79060 with rubber 13. The vertical lock 11, in turn, can be provided with a locking screw 14, by means of which the vertical lock 11 can be locked relative to the body part 6. The hook is detached by pulling the sleeve-like vertical lock 11 over the body part 6, whereby the vertical locking flange 3 of the hook part 1 is released, and by turning the knob part 90 °, so that the hook part 1 can be pulled out of the body part 6. In the locking position the cross-sectional shape corresponds to the shape of the outer surface of both the body part 6 and the locking flange 3. In this case, in addition to the square shape shown, all shapes that deviate from the central circular shape are functional solutions. When the hook part 1 is removed, the body part 6 can be closed in a dust-tight manner with a plug (not shown). li 5 79060 A quick-release towbar comprising - an L-shaped hook part (1) having - a bent knob part (2) to which the object to be pulled can be attached, - a vertical locking flange (3) fitted directly to the knob part (2) in the vicinity of the knob part (2) , with which the hook part (1) can be locked vertically, - the end locking part (5) at the opposite end of the hook part (1) to the knob part (2), and - the neck part adjacent to the end locking part (5), - the body part (6) with - a longitudinal cavity (9) into which the straight part of the hook part (1) can be pushed, - cavity plates (8) delimiting the cavity (9) in the vicinity of this closed end, the gap formed by the end locking part (5) of the hook part (1) being pushable and pivotable, 11), the inner cross-sectional shape of which corresponds to the outer cross-sectional shape of the vertical locking flange (3) and the body part (6) for locking the hook part (1) vertically with respect to the body part (6), characterized in that the vertical lock (11) is engaged To move around the body part (6), a spring (12) is connected to the mouth end of the cavity (9) and a spring (12) is connected to the vertical lock (11), which by spring force pushes the vertical lock (11) towards the mouth end of the cavity (9). Quick-release towbar according to Claim 1, characterized in that the vertical lock (11) is provided with a locking screw (14) for locking the vertical lock relative to the body (6). Quick-release towbar according to Claim 1 or 2, characterized in that the spring (12) of the vertical lock (11) is provided with rubber shields (13).