FI60524B - DRAGKROK VID EN TRAKTOR - Google Patents

Description

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Mjj) ('UTLÄGGN I NGSSKRIFT 60524 C (filteri. Ty 11 TO 1932 ^ (51) K ».ik.3 / int.a.3 B 60 D 1/04 FINLAND —FINLAND (21) Ρ« Μ «ιηΙΙ» »Ιί · ιηυ * - PK« ntanseknlnf 791509 (22) H * k * mi * peivt - AntOknlnpdaf 11-05 * 79 * (23)

Patent and Registration Office ΙΛίΚ, ρ - * .- »,. . . (44) NWitivWwIpinon j «ku (. | Ulfcaltun pvm. - _„ ratent- och registerstyrelsen v 'AimMcm utl.fd och utUkrifun pubitcend 30.10.8l' (32) (33) (31) Pjryduttjr utuolkus— Bugird prloritet (71) (72) William Eemil Koivula, 63350 Sulkavankylä, Finland-Finland (Fl) ^ (7 * 0 Tampereen Patenttitoimisto, (5 ^) Tractor towbar - Dragkrok vid en traktor

The invention relates to a tractor towbar comprising a hook, preferably two hook arms, two slides and a lever, the above-mentioned parts in combination realizing a trajectory which provides a backward / forward movement of the towbar and an almost vertical downward / upward movement.

- Hook structures such as those described above are known from the German patent publication 1 249 099 and from the Finnish patent publication 54 776.

In the structure according to German patent publication 1 249 099, a slide for controlling the movement of the hook is fixedly attached to the frame of the working machine. The lifting arm moving in the slide is articulated to the arm of the lifting hook, whereby the other end of the lifting hook is guided against the lower surface of the frame when the hook is used. The structure according to the German publication does not provide a backward trajectory of the hook, but the hook performs an almost vertical movement.

60524

The Finnish patent publication 54,776 discloses the trajectory of a hook shown in the preamble of the claim. Said trajectory is implemented by means of two articulated arms which are articulated at their lower end to the tractor body and at their upper end to fixed, upwardly directed lugs of the towbar body. In practice, with the structure according to the Finnish patent 54,776, it is possible to achieve a very short retraction distance of the hook, whereby the visibility of the hook from the tractor cab is not substantially improved.

It is an object of the present invention to provide a tractor towing hook which achieves a long rearward sliding distance of the hook.

This substantially improves the visibility of the hook from the tractor cab. In addition, the hook starts lifting right at the beginning of the work movement.

The tractor towing hook according to the invention is characterized by what is set forth in the characterizing parts of the appended claims.

An embodiment of the invention is illustrated in more detail in the following description with reference to the accompanying drawings, in which Figure 1 shows the towbar in the upper position when viewed from the side, Figure 2 shows the towbar in Figure 1 as seen from behind the tractor.

The towbar is attached to the tractor frame 1 by means of a lever 2 and a joint 3. The lever 2 is articulated in a suitable place, e.g. the tractor's lifting arm 4, by means of which the hook is powered. A slider 5 is articulated to the joint 3, which in this embodiment has a V-shaped cross-section, but other cross-sectional shapes are also possible. A hook arm 6 is arranged to move inside the slider 5, the other end of the lever 2 being articulated in a suitable place. Part 7 is the actual hook. In addition, a spring can be fitted at point 8 to facilitate the start of the movement. Figure 2 shows that the structure is in two parts, in which case the beam 9 connects the arms 6 of the hook and the actual hook 7 is installed in the middle of the beam · 3 60524

The towbar according to Figures 1 and 2 operates as follows. As the lifting arm 4 moves downwards, the lever 2 moves the hook arm 6 relative to the slider 5 so that the hook 7 performs a trajectory marked by thinner lines, which is almost horizontal at the beginning of the movement about 500 mm and then turns sharply downwards. into the hole of the drawbar, after which the drawbar is raised by the upward movement of the lifting arm 4.

Another possible embodiment of the invention would be that a second lever, such as a lever 2, is arranged at a suitable position between the body 1 and the hook arm 5, whereby the trajectory of the lifting hook is almost similar.

The invention achieves the following advantages. The tractor is transported and can easily see the towbar when attaching a trailer, for example, to the rear of the tractor. The lifting movement of the hook starts immediately, which helps to make the work easier.

Only one possible embodiment of the invention is shown here, but it is natural that embodiments of the invention may vary considerably within the basic idea.

Claims (3)

4,60524 1. Towbar esirn. on a tractor including a hook, a suitable hook Two hook arms (6), a slide (5) and a lever (2), the above-mentioned parts in combination providing a trajectory for rearward / forward movement of the drawbar and an almost vertical downward / upward movement, characterized in that the arms (6) of the nos-tcKook (7) are arranged to be guided at one end to a slider (5) articulated to the tractor body. Towing hook according to Claim 1, characterized in that one or more levers (2) are articulated at the ends between the shank (o) and the frame (1) of each hook (7), the hook (7) being used for the lever (2), e.g. by means of a articulated tractor lifting arm (4). Towbar according to Claim 1, characterized in that there is a distance between the slide (5) and the frame (1). a spring is provided in (8) to initiate the movement.