DE1164727B - Cultivator tines composed of several parts - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school KL: AOIb

German class: 45 a-35/22

Number: 1 164 727

File number: M 50540III / 45 a

Filing date: October 11, 1961

Opening day: March 5, 1964

The invention relates to a cultivator tine which is essentially rigid in itself is, is usually held in its working position by a spring and when overloaded is pivoted backwards against the spring action, so that an overload release occurs, which occurs in the case of stony or stuck ground is necessary. The spring force can usually be within a predetermined range Limits can be set to create maximum overload release when the tine tip should penetrate into solid ground and in order to achieve a lower overload release by which the stress on the mechanism and the machine in stony or heavy soil where the tines continuously jump is reduced.

However, it is desirable that when the device is set to the smaller value of the overload trip the restoring force exerted by the spring on the prongs does not occur as quickly as with the Setting for higher overload trip values. This is usually not the case with existing machines the case. In addition, the known devices are also difficult and time-consuming to adjust.

Cultivator tines are known which are arranged on a frame of the soil cultivation device are that they form double-armed swinging levers, the lever arms facing away from the tip of the tine two consecutive prongs are connected to one another by springs. This is supposed to a load balance of the tines can be achieved, even if a tine on a large, the other tine is set to a shallow working depth. The different soil reactions are in this arrangement by different lever arms or moments that the Applying springs to the tines, balanced. These known arrangements have the disadvantage that at the moment when the front prong hits an obstacle and first to avoid it seeks, at the same time the following tine as a result of the compensatory movement and the stronger tension the spring is forced deeper into the ground and thus also hits the obstacle before the first tine has left it. Damage and destruction of the tines are therefore inevitable.

The object of the invention is to avoid destruction or deformation of the prongs due to overload and an improved design of the cultivator tine of the type mentioned at the outset with a simpler To create adjustment options and thus to achieve an improvement in the cultivator itself.

To solve this problem, the invention provides composed of several parts
Cultivator tines

Applicant:

Massey-Ferguson (Australia) Limited, Sunshine, Victoria (Australia)

Representative:

Dipl.-Ing. F. Thieleke and Dr.-Ing. R. Döring,
Patent attorneys,
Braunschweig, Jasperallee 1 a

! 5 Named inventor:

Alan Foulkes Williams, Strathmore, Victoria
(Australia)

Claimed priority:

Great Britain 14 October 1960
(No. 35 214)

a cultivator prong composed of several parts, which can be pivoted on the cultivator frame attached and connected to one end of a tension spring that keeps it in its normal working position seeks to keep ahead; it is characterized in that to attach the spring to the An eccentric is used for prongs, which can be rotated between upper and lower limit positions and through which effective for the torque of the spring lever arm between the point of application of the spring on the Prongs and the articulation point of the prong on the frame is variable.

The eccentric preferably has the shape of a crank, which is equipped with stop surfaces, which interact in the limit positions with the contact surfaces of the tine. This is useful the crank arranged so that it can be converted into the limit position via its outer dead center position is.

According to a further feature of the invention, the arrangement is made so that the bias the spring in the normal working position of the tine and the upper limit position of the eccentric is lower than in the other limit position and that in the upper limit position of the eccentric for the torque of the tine effective lever arm is shorter than in the lower position of the eccentric.

409 537/166

An exemplary embodiment of the invention is shown in the drawing.

Fig. 1 shows a side elevation of a multi-part cultivator tine according to FIG of the invention;

Fig. 2 is a section along line H-II of Fig. 1;

F i g. 3 gives a perspective view of the upper one

The same lever arm around the axis of rotation 16 is denoted by b. When the crank is in the position shown in dashed lines, the spring has an actual length c and its lever arm effective for torque has the length d. The actual length α of the spring 21 and thus also the restoring force which acts on the prongs 12 when the lever 26 is in its lower limit position is greater than the effective length c

End of the tine shown in Figure 1 again;

Fig. 4 is a diagram showing the spring when the lever is in its upper position

the relationship between a load is at the tine limit position. Furthermore, it is for the

tip for the deflection movement up to the overload release torque effective lever arm b in the lower

sung; Position of the lever 26 greater than that in the other

F i g. 5 is a graph as in FIG. 4 Position for the torque effective lever arm d.

and shows the relationships for a conventional, known 15 With regard to the fact that the length of the spring 21

Tine arrangement;

Figures 6 and 7 are perspective views of a tine assembly in accordance with the invention in the known training on a reduced scale.

With reference to the drawings and particularly FIG. 1 is part of the cultivator main frame 10 shown together with a single, multi-part composite tine assembly 11. Self one Function of their bias and that the force resulting from the bias is initially must be overcome before the tine 12 can move, and that also for the torque effective lever arm of said force around the swivel joint 16 for both positions of the spring 21, respectively is constant, it follows that when the crank is in its upper position, there is a small load of the tine 12 it moves, and the tension

understandably, the spring 21 on a cultivator usually does not take place as quickly as when several of these prongs are located transversely at a distance from one another in the lower limit position,
intended for the direction of movement of the cultivator. This fact is shown in Fig. 4 in a graphical

Each prong consists of a long shaft 12, reproduced on loan representation in which the load is attached to a prong tip 13. The shaft on the tip of the tine as a function of the back 12 is not very flexible and is shown together with a supporting 30 movement of the tine. The line χ spring 14 attached to a support block 15, which denotes the position in which the crank is in the rotatable lower limit position attached to the frame 10, and the line y bezen 16 is hinged. The support block 15 has a draws the position in which the crank 26 assumes its upper abutment surface 20, which is an underside of the frame limit position. When the tine touches the un-10 and takes the working position of the tine 12 35 tere limit position, it begins to be determined backwards, which is biased in this position by a spring 21 when a load P acts on it, one end of which is biased Then a large increase in the load is required in connection point 22 (FIG. 3). On borrowed to move the prongs over a relatively short distance their other end is the spring around the middle one. At the upper limit position of the crank part 25 of a 40 designed in the form of a crank 26, the prongs 12 begin to move backwards, eccentric placed, the end parts of the crank fixed when a load Q, which is less than the load P, is placed in slots 27 of an arm 28 store on which the prongs 12 are brought into action. Because the tine shaft 12 is attached. One end of the crank for the torque effective lever arm b larger 26 has a hexagon head 29, which is later than the lever arm d, causes a slight increase in the purpose described, and the other end 45 hung the load, the prongs, is about a relative means a washer 30 and a transverse long distance to move. Hence the line is y

bolt 31 held in place. A plate 32 is welded to the crank and acts in the in Fig. 1 together with a counter surface 33 formed by the arm 28.

The crank 26 can be moved from the position shown in FIG. 1 to the position shown in FIG. 3 reproduced in dashed lines Position are transferred in that the hexagon head 29 by means of a screw wrench

steeper than the line x.

It follows that the lower position of the crank has the higher spring load and a ratio of the spring lever arm creates the lever arm of the force acting on the tip of the tine, in which a high value for the overload release and a high restoring force results in a solid, but unobstructed Land is desired; however, is in the

sels is rotated counterclockwise (Fig. 1). 55 upper position of the stop is arranged so that the crank exceeds its rear dead center spring tension and the ratio of the position, and the plate 32 comes in the end position of the spring to the tine tip is changed so that the crank on a second abutment surface 34 on the restoring force for the prongs in a much smaller arm 28 to support. Dimensions occurs. This is important when the cultivator F i g. 3 shows diagrammatically the crank 26 in FIG. 60 in operation on a very stony ground, thus solid lines when it is in the position in FIG. 1 is again the tine after its overload swing and the given position. In the dashed release when hitting a stone these lines are not shown in its other position 26.4 again from the ground against the operator throws ben when the plate 32 on the stop surface 34 and the entire facility unnecessarily endangered,
is present. 65 For comparison, FIG. 5 reproduced wornen position in which the prongs 12 are in the Arden, as the characteristic curves run, if, as is the case with the usual cultivators, the actual length is the spring-spring 21 with α and your active voltage for the torque z. B. changed by an adjusting screw

will. In this case, the ratio of the spring lever arm to the lever arm becomes that at the tip of the tine attacking force does not change when the spring tension is changed, so that the overload release and the return force is varied in direct proportion to the spring tension. Because the one for the torque effective lever arm of the spring remains the same, the degree of suspension remains unchanged. the practical effect of this characteristic causes the operator to tension the spring and thus reduce the overload release so that the tines are continuously released with the result bad cultivation. In contrast, if the setting according to the invention is performed, a flatter curve is produced in the low tension position, with a greater tine tip load and therefore better cultivation, but less risk of the cultivator and greater operator safety occurs.

The F i g. 6 and 7 show diagrammatically on a smaller scale the device according to the invention and a facility of usual training.

In Fig. 7, the screwing device is denoted by 35, and the spring is only slightly tensioned. In Fig. 6, the spring is shown in full lines at 21 in its maximum tensioned position and by the dashed line 21A in its minimum tensioned position. In FIGS. 6 and 7, the tine is denoted in solid lines in its working position with 12 and in its most rearward position with the dashed line 12A .

Claims (7)

Patent claims: 1. Cultivator tines composed of several parts, which can be pivoted on the cultivator frame attached and connected to one end of a tension spring that keeps it in its normal Seeks to keep working position, thereby characterized in that an eccentric (25, 26) is used between the upper and lower Limit positions is rotatable and through which the lever arm effective for the torque of the spring is variable between the point of application of the spring on the prong and the articulation point (16) of the prong on the frame (10). 2. tines according to claim 1, characterized in that the eccentric is in the form of a crank (25, 26), which is equipped with stop surfaces (32), which in the limit positions with Stop surfaces (33, 34) of the prong (12) interact. 3. tines according to claim 1 or 2, characterized in that the crank (25, 26) on their outer dead center position can be converted into the limit positions. 4. tines according to one of claims 1 to 3, characterized in that the crank (25, 26) is mounted on an arm (28) attached to the prongs (12), the slots (27) for the ends the crank has. 5. tines according to claim 4, characterized in that the stop surfaces on the one hand of a plate (32) attached to the crank (26) and on the other hand by the arm (28). 6. prongs according to one or more of claims 1 to 5, characterized in that the The crank (25, 26) is provided with a head (29) through which it can be opened by means of a wrench can be converted into the various positions. 7. Tines according to one of the preceding claims, characterized in that the bias the spring (21) in the normal working position of the tine and upper limit position of the eccentric is less than in the other limit position and that in the upper limit position of the eccentric the lever arm effective for the torque of the tine is shorter than in the lower limit position. Considered publications:
German patent application R 1454 III / 45 a (published February 8, 1951). For this! Sheet drawings