FI78052B - Control system for the support point of a bar - Google Patents

Abstract

The invention is a control system for the support point (1) of a bar, in which the bar (3) and the hydraulic cylinder (4) that sets the bar in motion are joined by a vertical pivot mast (2) by means of a joint with a horizontal axle. According to the invention, the pivot mast is furnished with a pivot support (6) by means of a joint (5) with a horizontal axle, on which the bar (3) rests, and which can be moved at the joint and turned and locked to the pivot mast at a point either above or below the joint in such a way that the arm's support point is consequently located either above or below the joint (5).<IMAGE>

Description

78052

BOOM SUPPORT POINT ADJUSTMENT EQUIPMENT - REGLERANORDNING FÖR EN STÖDPUNKT FÖR EN BOM

The invention relates to an apparatus as defined in the preamble of claim 1 for adjusting the height position of a boom support point.

Finnish patent 71968 discloses an apparatus by means of which the support point of a work machine boom can be adjusted in height according to the work site, whereby when .

In practice, however, it has been found that current equipment is unnecessarily complex, as the support point does not necessarily require several intermediate positions, but it is sufficient that the boom support point is always set either high enough or low enough for the intended use.

Thus, the object of the invention is to provide a simple and inexpensive boom support point adjustment device, enabling rapid adjustment of the boom support point in a pivot tower to be connected to a working machine.

With regard to the features characteristic of the invention, reference is made to the claims.

In the boom support point adjustment apparatus according to the invention, the vertical pivoting tower 30 has a pivot support supported by a horizontal axis joint, on which the boom is supported by a horizontal axis joint. The pivot support can be pivoted and locked to the pivot tower alternatively above or below its pivot, based on its pivot connecting to the pivot tower, so that the boom support point, i.e. the joint point of the boom and pivot support, is alternatively above or below the pivot tower and pivot support.

Preferably, the pivot support consists of two plate-like parts located on both sides of the pivot tower and the boom and articulated from one of the 5 points to the pivot tower.

In a preferred embodiment of the invention, the apparatus has two hydraulic cylinders, one on each side of the pivot tower and a boom connected to them by horizontal axis joints. However, the apparatus 10 can also be implemented with one hydraulic cylinder, in which case, for example, the boom can consist of two parts, between which the hydraulic cylinder operates.

The apparatus includes suitable locking means by means of which the pivot support can be locked to the pivot tower 15 in either the upper or lower position. These locking members can be various members known per se, such as e.g. holes in the tower, the corresponding holes of which are also in the pivot support, whereby a pin or a corresponding retaining member can be placed through these holes to prevent the pivot support from pivoting relative to the pivot tower.

An advantage of the invention over the prior art is a simple and inexpensive manufacturing point control device, which achieves essentially the same functions as even more complex devices and which allows the reference point to be adjusted safely and quickly.

The invention will now be described in detail with reference to the accompanying drawing, in which Figure 1 shows a device according to the invention in a lower position, Figure 2 shows the apparatus of Figure 1 in an upper position and Figure 3 shows a top view of the apparatus of Figures 1 and 2.

The adjusting device according to the invention shown in the drawing comprises a pivot support 6 connected to a pivoting pivot tower 3 78052 connected to a working machine by a horizontal joint 5, formed by two triangular, plate-like parts 7, at one angle of which the joints 5 are on opposite sides. The plates 5 are articulated for free rotation by means of a joint 5 in the turntable. A support point 1 of the boom 3 is formed in the middle of the opposite side of the joint 5 of the plates, i.e. the boom rests with a horizontal joint between these plates at point 1.

In addition, the plates in the region of their other two corners include holes 11 from which the pivot support 6 can be locked in place in the pivot tower 2 either in the lower position as shown in Fig. 1 or in the upper position as shown in Fig. 2. The two hydraulic cylinders 4 used in this application are 6 on each side and with a joint 12 at a distance from the boom 3.

The fulcrum adjustment apparatus shown in the drawing is used as follows. In Fig. 1, the apparatus 20 operates in its lower position, i.e. in this case the downward dimension of the boom 3 is relatively large and the boom can be used, for example, in excavation work. If the boom is to be reached as high as possible, the outermost end of the boom (not shown) is supported on the ground and the locking pin 25 is pulled out of place, so that the pivot support 7 rests only on the joint 5 in the pivot tower 2. In this case, pushing the hydraulic cylinder 4 long enough that the holes 11 on its other edge come to the hole 9 above the joint 5 in the pivot tower, whereby the pivot support can be locked by the pin 10 to this upper position as shown in Fig. 2. Thus the boom support point 1 is moved from the lower position to the upper position and the boom has an upward dimension 35 significantly more.

The invention has been described above by way of example with reference to the accompanying drawing of various aspects of the invention

Claims (9)

However, applications of the 78052 are possible within the scope of the inventive idea defined by the appended claims. 5 PATENT CLAIMS A boom support point (1) adjustment apparatus, wherein a boom (3) is connected to a vertical pivot tower (2) by a horizontal axis joint and a hydraulic cylinder (4) for moving the boom, characterized in that the pivot tower (2) has a horizontal axis. a pivot support (6) supported by a joint (5), on which the boom (3) is supported and which can be pivoted and locked on the pivot tower, alternatively above or below its joint 15, so that the boom support point (1) is located above the joint (5) -or below. Apparatus according to claim 1, characterized in that the pivot support (6) consists of two plate-like parts (7), between which the pivot tower (2) and the boom (3) are located. Apparatus according to claim 1 or 2, characterized in that the apparatus comprises two hydraulic cylinders (4), one on each side of the turn tower (2) and the boom (3). Apparatus according to one of Claims 1 to 3, characterized in that the pivot tower (2) and the pivot support (6) have locking means (8) for locking them to one another. Apparatus according to claim 4, characterized in that the locking members (8) consist of holes (9) in the pivot tower (2) and the pivot support (6) and a pin (10) to be inserted therein. 35 PATENTKRAV 1. The regulatory procedure with effect from point (1) above