CZ20002870A3 - Clip and process for producing thereof - Google Patents

Abstract

Clamp (1) to secure part to the agricultural tool especially for securing the cultivation tip (6) to the frame the element (7) is formed by a piece of steel sheet which is bending divided into two arms (2, 3), one of which the arm (2) has an opening (5) with an edge (8) substantially located in the determination plane for receiving a portion of the component to be used securing, in particular, the tip (6) of the culture tip or the tip Springs. Sheet metal material along edge (8) part (9) extending in the bend direction (4) and the remainder (10) extending around the opening (5). Remaining part (10) the material around the opening (5) extends outside and preferably in substantially perpendicular to the plane of the edge (8) of the opening in the direction of second arm (3).

Description

Clamp and method of its manufacture

Technical field

The present invention relates to a clamp for securing a part to an agricultural tool, in particular for securing a cultivation spike to a frame member that includes a piece of steel sheet that is bent divided into two arms, one of which has an opening through a steel plate with an edge substantially positioned in a plane to receive the portion of the component to be secured, in particular the end of the cultivation tip or tine spring, wherein the sheet material includes an edge-extending portion along the edge and a remaining portion extending around the aperture.

BACKGROUND OF THE INVENTION 15

Such a clamp is known, for example, from GB-A-2 050 131, which describes a clamp made of a rectangular piece of sheet steel having two holes, one for receiving the end of the cultivation tip and one for receiving the tapered head screw for clamping the other arm. clamps and ends of the cultivation tip around the frame member to which the cultivation tip is to be secured. The effect of using a tapered bolt is that the first clamp arm is tightened relative to the frame member.

DK 101 615 C discloses a clamp for securing a cultivation tip to a frame member that is made of a piece of steel bar that is bent into a loop and two branches, the branches being held together by a clamping block when the clamp is in use. In use, the loop extends around

30 of the culture tip and the branches extend over the frame member.

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It is an object of the present invention to provide an improved clamp.

SUMMARY OF THE INVENTION

The above object is achieved by means of a clamp of the type mentioned in the introduction, which is characterized in that the remaining part of the material around the opening extends outside and preferably substantially perpendicular to the plane of the opening edge in the direction away from the second arm.

As a result of this arrangement, the width of the clamp can be limited to the width of the part to be secured and twice the thickness of the sheet material, which is advantageous because it provides a greater degree of freedom for lateral placement, for example, of the cultivation spike on the frame member. In addition, material savings are achieved because the width of the second clamp arm may be less than normal. Finally, a larger abutment surface is also achieved against the part to be secured, because the clamp plate material around the hole has been rotated 90 ° compared to known terminals and rests flat against the part to be secured.

The second arm preferably has an opening for receiving the clamping screw, and a portion of the sheet material adjacent to the opening has been pressed down to the same side as the first arm, resulting in an inclined transition from the portion that has been pressed down to the rest of the second arm. By clamping the inclined transition between the part that has been pressed down and the remaining part of the second clamp arm will have the same effect as the tapered head bolt used according to the aforementioned GB-A-2 050 131, which allows the conventional clamp to be used. E

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of a standard screw instead of a tapered special screw, resulting in economical replacement of the screw in case of damage.

The opening in the first arm preferably forms a substantially isosceles triangle with rounded corners and its apex faces the second arm. In this way, a favorable stress distribution in the material is achieved.

The clamp preferably has a degree of hardness in the range of 43 to 49

HRC.

The object of the present invention is also achieved by a method of manufacturing a clamp according to the present invention, which comprises forming a straight sheet steel blank with first and second ends, the first end having a through hole with an edge, a portion of the stock material around the edge extending towards the other end of the blank and the remaining portion extending around the opening, the remaining portion being hot-formed from the blank plane, preferably to a position substantially perpendicular to the blank plane, and wherein the blank is bent obliquely.

Preferred embodiments of the method of the present invention are defined in the appended dependent claims 6 to 9.

The present invention also relates to an agricultural tool, in particular a cultivator with an element clamped on a frame element, wherein the element is clamped by the clamp described above and defined in the appended claims 1 to 4.

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The present invention will be explained in more detail in the following description by way of example embodiment with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 shows a perspective view of a clamp;

Giant. 2 illustrates a blank for manufacturing the clamping means prior to forming;

Fig. 3 shows a blank according to claim 2 after molding the material around an opening in the first arm;

Figures 4 to 6 show the completed clamp in three mutually perpendicular directions;

Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 6; and

Figure 8 illustrates the use of a clamp.

DETAILED DESCRIPTION OF THE INVENTION

Giant. 1 and 4 to 8 show a clamp 1 with a first arm 2 and a second arm 3. / wherein the first second arm 2 and 3 meet at a bend 4. ·

The first arm 2 is formed with an opening 5 for receiving an end of an element, for example a tine spring 6 of the cultivator to be clamped on a frame element, such as a square tube, of an agricultural tool.

The aperture 5 is defined by an edge 8 located in the plane of the first arm 2. The clamp material portion 9 bordering the edge 8 extends toward the bend 4, while the other material portion 10 bordering the edge 8 is bent approximately 90 ° to a position perpendicular to the plane of the edge as shown in the figures.

The end 11 of the second arm 3 opposite the bend 4 is formed with a screw receiving hole 12 as shown in FIGS. 8, 5

The region 13 behind the opening 12 has been compressed towards the side in which the first arm 2 extends, thereby forming oblique regions 14 between the regions 13 that have been compressed and the remainder of the second arm 3.

A bulge 15 has been formed in the bend 4. This bulge is well known in the art.

The clamp is used in a manner known per se, as shown in Fig. 8, wherein the cultivator tip spring 6 is fixed to the square tube 2 by means of the clamp 2 and the screw 16. The cultivator tip spring 6 is guided through the aperture 5. The first arm 2 and the screw 16 pass through the opening in the tine spring 6 of the cultivator and through the opening 12 in the clamp 2 to clamp the two elements around the square tube 2. The inclined regions 16 abut the corner 17 of the square tube 2'and

2o the first arm 2 to abut against the side 18 of the square tube

2.

Taking into account the bent portion 10, a relatively large abutment surface is achieved between the clamp 1 and the tine spring 6 of the cultivator relative to what is achieved with the known clamps, resulting in less surface pressure.

In particular, as will be seen from FIG. 4, the clamp 2 is only twice the thickness of the material of the portion 10 wider than the opening having further dimensions selected according to the tine spring 6 of the cultivator or another element with which the clamp is to be.

used. The terminal 2 of the present invention is therefore not narrower than similar known terminals. This is advantageous because it leaves more space for accurate positioning of the tiller spring 6 along the square tube 7, which can carry many other elements than the tiller springs.

The bulge 15 acts in a manner well known in the art to compensate for manufacturing tolerances between the square tube 2 and the clamp 11 and to prevent the second arm 3 from first being supported against the square tube 7 near the bend 4, which would create too much high clamping force in the first arm of the 2nd terminal 1 ..

The clamp 1 is manufactured by cutting a sheet metal clamp blank 1 ', the blank having an opening 2' at one end 2 ', and an opening 12' at the other end 3 '. The aperture 5, 15 'is narrower than the aperture 5 in the finished part. By means of thermoforming, a portion 10 'of the blank 1' is bent and this portion is bent around the opening 5 'by approximately 90 ° so that the blank 1' 'is bent. 3, in which the portion 10 'extends upwardly from the plane of the figure. Forming is usually done by dragging. Then, the areas around the hole 12 'are compressed, and the blank 1' is bent into the structure shown in FIGS. 1 and 4 to 8. Finally, the blank is tempered to a hardness of 43-49 HRC.

Claims (9)

PATENTOVÉ. Claims Clamp (1) for securing a part to an agricultural tool, in particular for securing a cultivation spike (6) to a frame member (7) comprising a piece of steel sheet which is divided by bending into two arms (2, 3), one of which the arm (2) has an opening (5) through a steel plate with an edge (8) substantially positioned in a plane to receive a portion of the component to be secured, in particular the end (6) of the cultivation spike or spike spring, an edge (8) a portion (9) extending towards the bend (4) and a remaining portion (10) extending around the opening (5), characterized in that the remaining portion (10) of the material around the opening (5) extends outside and preferably substantially perpendicular to the plane of the opening edge (8) in a direction away from the second leg (3). Clamp according to claim 1, characterized in that the second arm (3) has an opening (12) for receiving the clamping screw, and that a portion (13) of the sheet material adjacent to the opening has been compressed to the same side as the first arm (3). 2), wherein an inclined transition (14) is formed from the portion (13) that has been compressed to the remaining portions of the second arm (3). Clamp according to claim 1 or 2, characterized in that the opening in the first leg (2) forms a substantially isosceles triangle with rounded corners, its apex pointing towards the second leg (3). Clamp according to claims 1 to 3, characterized in that it has a degree of hardness in the range of 43 to 49 HRC. • 0 A method of manufacturing a clamp as defined in claim 1, characterized in that a straight sheet metal blank (1 ^z ) is formed with first and second ends (2 ^Z , 3 '), wherein the first end (2 ^Z ) is provided with a through hole (2). 5 ^Z ) with edge, 5 portions of the workpiece material around the edge extending towards the other end (3 ^Z ) of the workpiece (1 ^z ), and the remainder (10 ^z ) extending around the opening, while the remainder (10 ^z ) is avoided by hot forming blank (L ^Z), preferably to a position substantially perpendicular to the plane 10 of the blank, and wherein the workpiece (L ^Z) is obliquely bent. Method according to claim 5, characterized in that the blank (1 ^z ) is produced with a width that is larger in the first end (2 ^Z ) than in the second end (3 ^Z ). 2.5 7. Method according to claims 5 or 6, characterized in that the blank (L ^Z) is formed with a relatively narrow opening (5 ^Z), which is stretched to the width during the heat deformation which is substantially dragging. Method according to claims 5 to 7, characterized in that the other end (3 ^Z ) is formed with embossments (13) on the sides. Method according to claims 5 to 8, characterized in that the blank after molding is cured to a hardness degree in the range of 43 to 49. An agricultural tool, in particular a harrow, formed with an element (6) secured to the frame part (7), characterized in that the element (6) is secured by means of a clamp (1) defined in claims 1 to 4.