FI121893B - Telescopic elongated shaft for the tool - Google Patents

Description

TOOLS TELESCOPIC LENGTH

The invention relates to a telescopically extending arm of a tool comprising a rotary movement and axial force transmitting portions, the extension and shortening of the arm being achieved by means of an axial movement power mechanism, such as a hydraulic cylinder, whose separate telescopically movable parts the impellers connected to the parts arranged such that the first part directly actuated by the power unit causes the second part to move through the traction means and the diverting wheel connected to the first part and the third part to move through the traction means from the first part.

Telescopically extending booms in cranes, such as truck cranes and timber loaders, are generally known in the foregoing introduction, in which the outermost boom is generally tracked extending to provide precise directional movement, and also because the extension provides greater reach. These solutions often have the cylinders needed outside the parts visible. The cylinder pushes out and retracts only one telescopic part. In some cranes, according to the preamble, the ejection of a plurality of nested parts is accomplished by means of a single cylinder and by means of traction means and pulleys. However, the telescopic boom is so upright in the operating position that it is not necessary to pull the parts inside when they come down gravitationally. Also known in the retract is a solution in which the other end of the traction member is secured to the outermost telescopic part and the parts are retracted together by means of the traction member and e.g. a winch.

The gravity exit of a plurality of telescopic portions of the tiller shaft is known in gravity and is retracted by means of a single drive member and winch, for example, U.S. Pat. Their use is thus limited to vertical drilling.

The known solutions have the disadvantage of directional limitation. In the known ground drill, the arm extensions only work when the arms are sufficiently vertical. Drilling downwards is only possible because there is no ejection of the telescopic parts. This limits the use of ground drills to prevent horizontal road drilling, for example. On the other hand, some telescopic arms, which are composed of several parts, have the disadvantage of being retracted if the arm cannot be turned vertically so that gravity acts as a retraction.

The telescopic handle according to the invention solves the above problems and the arrangement according to the invention is characterized in that for pulling the parts of the handle there is provided a first part pulled by a power unit in a retracting direction, the first end is secured to the moving part of the power unit that it first rotates an impeller stationary within the shaft and then an impeller connected to the moving part of the power unit.

An advantage of the telescopic shaft arrangement according to the invention is that the double-acting hydraulic cylinder of one movement length provides a controlled movement outwards and a controlled movement inward of three cycles. As a solution for the drill bit arm, the drill bit can be drilled at any angle, since the outward movement of the blade can provide feed movement and also combine the necessary feed force. With the solution according to the invention, the outside of the telescopic parts remain completely free surfaces, since all the equipment necessary for moving can be fitted inside the telescopic parts.

The invention will now be explained in more detail with reference to the accompanying drawing, in which Figure 1 shows a side drill as seen from the side.

Fig. 2 shows the drill bit partially extended.

Figure 3 shows the internal structure of the telescopic parts and the push / pull cylinder.

Figure 4 shows a cross-section of the telescopic parts.

Figure 5 schematically shows the ejection of the telescopic parts.

Figure 6 schematically shows the retraction of the telescopic parts.

Figure 7 shows a push / pull cylinder.

Fig. 1 shows a ground drill having a spiral blade 13, the drill arm 14 of which is connected to a connector 19 attached to the end of the outermost telescopically movable part 3. Other telescopically movable parts are parts 2 and 3. In the drilling situation, parts 13,14,19,3,2, and 1 rotating. The rotation takes place at one end of the non-rotatable body 5, on which is mounted a rotation device 18, such as a hydraulic motor-driven rotator. The ground drill is connected to the vinker machine 3 via the movable unit 16 on the body part 5. By means of the hydraulic cylinder 17, the soil drill is movable relative to the unit 16. The rotation of the circular body portion 5 relative to the unit 16 is prevented by a groove in the unit 16 and a corresponding rod 15 secured to travel on the surface of the body portion 5.

In Figure 2, the telescopic parts 1-3 are somewhat extended as they are in Figure 3. The drive / push cylinder 8 of the apparatus is mounted such that the end of the piston rod 9 is locked into a rotatable flange 21 disposed at the end of the body 5. to rotate axially, but rotates as rotated by rotating device 18, as can telescopic parts 1-3. The right end of the cylinder / part 8 of the drive / push cylinder is secured to the rear end of the first telescopic part 1 using, for example, a pin 10. The first telescopic part 1 thus moves whenever the cylinder 8 moves. A diverting wheel 26 is attached to the left end of the cylinder part 8 through which a drive member 6 is rotated, the second part 2 being pushed outward by a pulling motion. One end of the traction member 6 is secured to the stationary flange 21 by a short spring arrangement 20 and the other end to the rear end 12 of the second part 2. Its second end includes a deflection wheel 27 for rotating the traction member 7 one end at the rear end of the third part 3 at point 11. In this way, the ejection is effected by the movement of one cylinder 8 and the ejection is three times the movement of the cylinder 8.

Figure 4 illustrates how the pulleys are disposed in the intermediate spaces of the telescopic parts 1-3. Naturally, the traction elements also pass through them. relating to provide symmetrical thrust movement of the ejection parts are placed in a second, opposite side of the intermediate spaces. Thus, no tensile / thrust-related equipment is visible outside the telescopic parts 1-3.

Fig. 5 schematically shows the ejection of the telescopic parts 1-3. Only part 1 is pushed by the movement of the cylinder 8. The pulling members 6 and 7 are e.g. chains or steel ropes.

Figure 6 schematically shows the retraction of the telescopic parts 1-3. The retracting arrangement is arranged inside the telescopic parts 1-3 so that it is also inside the smallest part 3 when the part 3 is retracted. The cylinder 8 pulls the first part 1 directly in, in the diagram an anchorage point 28. In addition, the pull-in comprises only one pulling member 24 which is arranged so that one end is secured to the movable part of the cylinder 8, 25 and the other end to the third part 3, preferably at the front, item 29. The drive means further rotates through the pivoting wheel 22 attached to the cylinder 8 and through the fixed pivoting wheel 23, which is obtainably stationary so that the piston rod 9 of the cylinder 8 passes through the cylinder 8 and said pivot wheel 23 Alternatively, this diverting pulley 23 may be mounted fixed to the parts 1-3 by some other mounting arrangement such as the end of a rod from the flange 21, but the former is the simplest solution.

When the parts 1-3 are pushed out, the retracting drive member 24 releases loosely at the same time on the part 3. The cylinder 8 can also be secured with the cylinder part 8 in place and its other end secured to the flange 21. The piston rod moves inside the parts 1-3 and moves the diverting wheel! 26 and 22 are then mounted on a piston rod and a fixed diverting pulley 23 on the cylinder 8.

Although in diagram 6 only the telescopic parts 1 and 3 are retracted, the part 2 also becomes retracted, since the pulling member 7 of the push assembly of Fig. 5 retracts the part 2 while the parts 1 and 3 are retracted.

Claims (5)

A telescopically extending shank in a tool (13), the shank comprising rotational motion and axial force transmitting parts (1-3) and whose extension and shortening has been accomplished by means of a power device, as well as a hydraulic cylinder (8), which makes axial direction and the separate telescopically in relation to each other concerning the parts (1-3) of which the shafts are arranged in a manner known per se by use of pulling means (6); (7) and in the parts (1) and (2) coupled discs (26); (27) adapted so that, by means of the power device (8), the first part (1) directly engages via the pulling means (6) and the disc (26) coupled in the first part to the movement to the second part ( 2) and in the second part, the disc (27) coupled via the first part (1) exiting the pulling member (7) causes the movement to the third part (3), characterized in that for pulling the parts (1-3) in the shaft , belongs to the arrangement in the direction of retractable pull taking part (1) and a pulling member (24), the first end of which is fixed to the movable part (25) of the power device, the other end of the pulling member (24) being fixed in the third part (3), so that it first circulates the disc ( 23) which is fixedly inserted into the shaft and then the disc (22) which is fixed in the movable part of the power device. Shaft according to Claim 1, characterized in that the tensioning means (6); (7) which are included in the ejection of the shaft parts (1-3) and the break discs (26), (27) are placed in between the parts (1-3). the gaps that have been achieved by adapting sufficient magnitude difference between the cross-sectional measurements of the profile shapes of the parts (1-3). Shaft according to Claim 1, characterized in that the movement device of the parts (1-3) associated with the shaft shortening is adapted to the innermost part of the shaft, whereby it is arranged to project substantially inside the smallest part (3) of its cross-sectional dimension. . 4. A shaft according to claim 1, characterized in that the fixed break plate (23) in connection with the retraction of the parts (1-3) is fixed at the end of a piston rod (9) passing through the cylinder part (8) of the power device. 5. A shaft according to claim 1, characterized in that the pulling means (6); (7); (24) are chains or steel cables.