EP0080038B1 - Telescopic jib, in particular for inclined lifts - Google Patents

Description

The invention relates to telescopic boom according to the preamble of claim 1. Such a telescopic boom is known from the French utility model 2 377 748. In the telescopic boom for the known inclined elevator, a winch is arranged at the lower end of the first telescopic section, which simultaneously serves as a rail winch (for telescoping the individual shots) and as a load winch (for moving a load bucket or the like on the guide rails of the telescopic boom). The rope running off the winch is guided over pulleys at the upper end of the lowest telescopic section, runs from there over the lower pulleys of the second telescopic section and further via a cable clamping device arranged at the lower end of the second telescopic section over the head pulley to the trolley.

The rope can be fixed relative to the second telescopic section by means of the rope clamping device, so that no more pull can be exerted on the transport trolley. When the winch is actuated, only the telescopic sections are extended to one another.

When the rope clamping device is released, a locking between the first and second telescopic shot is automatically effected.

From the not d. T. belonging to German patent specification 3 001 410, a locking device is known, by means of which the individual telescopic sections can be locked to one another in that after actuation of a locking device arranged on the lowest telescopic section - which effects a locking between the first and the second telescopic section - via corresponding cable connections automatically Interlocks between the subsequent telescopic sections are inserted or removed.

Starting from the std. T. according to the French utility model 2 377 748, the invention has for its object to be able to perform as many functions as possible via a rope or a winch in a telescopic boom of the type mentioned. In particular, the task is addressed here of being able to use a winch rope to simultaneously carry out a time-separated telescoping and angling of the last telescopic section. The upper end of the second-last telescopic shot on the one hand and the lower end of the last telescopic shot on the other hand should be designed in such a way that the last telescopic shot and the penultimate telescopic shot are also securely guided to one another in any bending position. Since, in particular, the kinked part of the inclined lift on the eaves had previously been time-consuming and had to be carried out by hand under difficult conditions, the aim is to simplify this.

The invention solves this problem with the teaching according to claim 1.

• a) getrenntes Aus- bzw. Einfahren des letzten Teleskopschusses
• b) Abknicken bzw. Einfahren des letzten Teleskopschusses
• c) Abknicken bzw. Wiederaufrichten des letzten Teleskopschusses in beliebigen Winkelstellungen.

The following functions can thus be operated with a single winch or only a single controlled rope:

• a) separate extension and retraction of the last telescopic shot
• b) Bending or retracting the last telescopic shot
• c) Bending or straightening the last telescope shot in any angular position.

• d) Ausfahren bzw. Einfahren des zweiten Teleskopschusses einschliesslich aller weiteren Teleskopschüsse mit Ausnahme des vorletzten Teleskopschusses;
• Durch die DE-A-2 708 796 ist ein Transportschlitten für Schrägaufzüge bekannt geworden, welcher am Ende des Teleskopauslegers in eine abgewinkelte Position gefahren werden kann. Hier wird nicht der letzte Teleskopschuss, sondern der Transportwagen selbst in eine abgewinkelte Position gebracht.

In addition, the function results from using the technical teaching that can be derived from the generic term:

• d) Extending or retracting the second telescopic section including all other telescopic sections with the exception of the penultimate telescopic section;
• From DE-A-2 708 796 a transport carriage for inclined lifts has become known which can be moved into an angled position at the end of the telescopic boom. It is not the last telescopic shot that is brought into an angled position, but the trolley itself.

The features of claims 2 and 3 relate to advantageous refinements of the locking device, by means of which the position of the last telescopic shot compared to the penultimate one can be fixed. The claims 4 and 5 contain design features of the guides of the last and penultimate telescopic shot to each other for the purpose of kinking. The teaching according to claim 5 is of its own inventive rank. Here it is important that the slide shoe connected to the penultimate telescopic shot, even with the associated handlebars, with a correspondingly long design, can form all or part of the bendable end of the penultimate telescopic shot, so that the am outer end of the penultimate telescopic shot articulated guide section according to claim 4 can be shortened or possibly omitted. The features of claim 6 favor an inexpensive construction of the entire inclined elevator, because by assigning the tensioned rope profile cross sections of smaller dimensions can be used, which in turn has a favorable effect for the kinking technique according to the invention, because the weight of the last, bendable telescopic shot can be kept low .

The particular advantage of the invention thus lies in the use of only one winch and one rope for several functions, in particular for the telescoping of the individual telescopic sections in combination with the kinking of the last telescopic section.

In the following, the invention is explained in more detail using an exemplary embodiment and the drawings shown.

• Fig. 1 eine vereinfachte Seitenansicht eines Schrägaufzuges mit Seilzug als Untergurt,
• Fig. die fünf Schüsse eines Teleskopauslegers, wobei die einzelnen Schüsse nebeneinander gelegt sind, um die Seilführung besser zu verdeutlichen,
• Fig. 3 das Ende des vorletzten Teleskopschusses in teilgeschnittener Seitenansicht,
• Fig. 4 eine Draufsicht auf das in Fig. 3 gezeigte Ende,
• Fig. 5 eine perspektivische Darstellung des letzten und des vorletzten Teleskopschusses mit abgeknicktem letzten Teleskopschuss,
• Fig. 6, 7 und 8 Seitenansichten des Schrägaufzuges in drei verschiedenen Positionen,
• Fig. 9 die Ausbildung einer selbsttätig einschnappenden Riegelvorrichtung.

Show it:

• 1 is a simplified side view of an inclined elevator with cable pull as the lower chord,
• Fig. The five shots of a telescopic boom, the individual shots next to each other which are laid to better illustrate the rope guide
• 3 the end of the penultimate telescopic shot in a partially sectioned side view,
• 4 is a top view of the end shown in FIG. 3;
• 5 is a perspective view of the last and penultimate telescopic shot with the last telescopic shot bent,
• 6, 7 and 8 side views of the inclined elevator in three different positions,
• Fig. 9 shows the formation of an automatically snapping locking device.

The first telescopic section 4 of the inclined elevator 1 carries as an actuating means 3 a motor winch 23, the cable 2 of which is a pulley rope 8 of a pulley block 7, which, deflected several times via rollers 9, from the opposite ends of two adjacent telescopic sections (e.g. upper end 10 of the first telescopic section 4 and beginning 16 of the second telescopic section 5) is guided back and forth over rollers 9.

Between the first telescopic section 4 and the second telescopic section 5, a manually operated lock 6 is provided, which is brought into engagement when a predetermined or selected extension length is reached, and thus prevents a relative displacement of these two shots.

The block and tackle rope 8 per se could be guided from the beginning 16 of the second telescopic section 5 via the penultimate telescopic section 13 directly to the beginning 14 of the last telescopic section 15. However, in order to avoid rope accidents, it is expedient, as shown, to first guide the pulley rope 8 from the beginning 16 of the second telescopic section 5 to its outer end 20, and from there to the beginning 17 of the third telescopic section 18 and then to the outer end 12 of the fourth or penultimate telescopic section 13, then to a multiple bypass 50 to one of the outer rolls 57, from there to the pivotable central roll 56, which is attached to the penultimate telescopic section 13, back to the other outer roll 57, and from there to the beginning 14 of the last telescopic shot 15. Here the pulley rope 8 is fixed (see FIGS. 3, 4, 5).

It can be seen that the pulley cable 8 alone cannot achieve a smooth, uniform extension. A package-wise extension depending on the frictional conditions would occur, and after the locking the shots could still be shifted against each other. Therefore, a lock between the individual telescopic sections is usually required. According to the proposals of the invention, this is effected with the aid of fixed length cable sections 19, which extend from the first telescopic section 4 via the outer end 20 of the second telescopic section 5 to the beginning 17 of the third telescopic section 18, and from the beginning 16 of the second telescopic section 5 via the outer end 21 of the third telescopic section 18 are guided to the beginning 22 of the penultimate or fourth telescopic section 13. These rope sections 19 do not have to be operated. Your function is automatic. Only the length of the legs changes. If the position changes between the first telescopic section 4 and the second telescopic section 5, the position between the following ones also changes accordingly. This also solves the question of locking between these telescopic sections.

If the last telescopic section 15 should be able to be bent in the extended position, then it must be in a leading connection with the penultimate telescopic section 13 on the one hand, and on the other hand it must be specially designed. 3, 4 and 5 show, the penultimate telescopic section 13 has at its outer end 12 a guide section 31 which is articulated over the axes 30 and whose guide profile 33 with its guide flanges 34 comprises the corresponding profile of the last telescopic section 15. The last telescopic section 25 carries a corresponding articulated section 32 with the axes 30 'at its beginning 14. The locking device 24 (see FIG. 9) is arranged such that in the locked position the joints 51, 52 with the axes 30, 30' are approximately at the same level and are therefore released.

The extension and the function of the kinking of the last telescopic section 15 proceeds as follows:

With the tackle rope 8, the desired boom length is extended without the last telescopic shot 15, and the lock 6 is inserted. Each telescopic shot, with the exception of the last telescopic shot 15, has traveled the same way with respect to its leading shot. The forces are absorbed by the rope sections 19 of fixed length. The pulley rope 8 is relieved. If the motor winch 23 is now operated again, the block and tackle rope 8 can only be shortened in that behind the multiple bypass 50 the rope end 45 fastened at the beginning 14 of the last telescopic section 15 pulls the last telescopic section 15 out of the guide of the penultimate telescopic section 13.

The last telescopic section 15 now runs against a stop indicated at 48, which is arranged such that the two joints 51, 52 with their parting planes 35 are in the same position (see FIG. 5) and are thus released. As soon as the operator loosens the tension of the pulley rope 8 in the area of the multiple bypass 50 spanning the kink, together with the attached guide section 31 and the articulated section 32 the last telescopic section 15 swings into the desired working position driven by its weight.

With the help of the pulley rope 8 with the multiple bypass 50, the kink can now be removed again. The tackle rope 8 is tensioned so that a support arm 39, which can be pivoted, for example, about the wheel axis 46, pivots the slide shoe 37, on which the outer rollers 57 are arranged, with the outer shot part 36 of the last telescopic shot 15, so that this again with the penultimate telescopic shot 13 is brought into an aligned position. By the tensioning of the tackle rope 8 is extended a little further via the multiple bypass 50 of the last telescopic shot, so that the locking bolt 27 (see FIG. 9) of the lever 28 pivoted by a spring 29 is guided out of the locking latch 26, and around that heart-shaped guide piece 25 pivoted around. A locking piece 55 makes this function more secure. The lock is released. The last telescopic section 15 moves into the penultimate telescopic section 13, the locking bolt 27 returning to its starting position by bending a leaf spring 54.

The transport carriage 53 is moved in a known manner with the aid of an additional rope 59, which is guided over a load roller 58 (see FIG. 4) arranged at the end of the last telescopic section 15, to its end position shown in FIG.

A further embodiment is shown in FIG. 1. By using a tensioned cable 44 as the lower chord 41, the bending stiffness of the telescopic boom can be increased so that it experiences practically no significant deflection due to its own weight and the load (trolley 53) carried on it. The individual telescopic sections are thus easier to move against each other. On the other hand, the overall construction becomes lighter. The load weight can be increased. The tensioned cable 44 runs from a supply tension roller 42 via removable spacers 40 to an arbitrary attachment point on the penultimate telescopic section 13, and can be fixed by means of suitable clamping devices 43.

The supply tension roller 42 automatically pulls the tensioned rope 44 when the telescopic boom is shortened. The lock 6 and the cable sections 19 of fixed length enable this function.

When the free end of the telescopic boom 49 lies on a fixed point, its weight and that of the transport carriage 53 create a deflection which increases the tension of the tensioned cable 44. Special clamping devices are therefore not necessary.

Claims (6)

1. Telescopic boom formed of a plurality of telescopic lengths or sections, especially for inclined hoists (1), the telescopic sections (4, 5, 13, 15, 18) of said boom forming guide flanges (34) for a transporting truck (53) adapted to travel thereon, with a rope (8) guided in pulley block manner from the first telescopic section (4) to the second telescopic section (5) and operated by a winch (23), with finite ropes (19) which serve to move further telescopic sections and which each lead from a fixed point of one telescopic section via the end of the following telescopic section to a fixed point on the beginning of the next telescopic section in succession and also include at least the beginning (22) of the penultimate telescopic section (13), also with locking means (6) securing the extension position between the first telescopic section (4) and the second telescopic section (5), characterised by the following features:

a) the rope (8) operated by the winch (23) is guided from the second telescopic section (5) via the end (12) of the penultimate telescopic section (13) further to the beginning (14) of the last telescopic section (15) and secured there;

b) between the penultimate telescopic section (13) and the last telescopic section (15) there is provided a locking device (24) latchable and un- latchable by operation of the rope (8);

c) the end (12) of the penultimate telescopic section (13) and the beginning (14) of the last telescopic section (15) are constructed to be capable of being set at an angle relatively to one another.

2. Telescopic boom according to claim 1, characterised in that between the penultimate telescopic section (13) and the last telescopic section (15) there is provided a locking device (24) which snaps-in automatically at a predetermined extension length and which prevents the last telescopic section (15) from telescoping-in relatively to the penultimate telescopic section (13).

3. Telescopic boom according to claim 1 or 2, characterised in that, as the automatically latching locking device (24), there is associated with one of the two last telescopic sections (13 or 15) a substantially heart-shaped guide piece (25) with a locking catch (26) and with the other telescopic section there is associated a locking bolt (27) pivotable resiliently (spring (29) ) and arranged on a lever (28), which bolt at the extending movement of the telescopic sections (13 or 15) being guided on the guide piece (25) up to falling into the locking catch (26) at the following retracting movement, and that the locking catch (26) and the guide piece (25) are so dimensioned that when there is a fresh relative movement of the telescopic sections (13, 15) caused by rope tensioning the locking bolt (27) lifts out of the locking catch (26), moves pivotably further, and then at the following change of direction in the movement of the telescopic sections (13,15) falls, swinging around the guide piece (25), back into its initial position.

4. Telescopic boom according to one of claims 1-3, characterised in that the penultimate telescopic section (13) comprises at its outer end (12) a guide part (31) which is attached pivotably (pivot pins (30) ), whereas the last telescopic section (15) comprises a corresponding pivotable part (32) at its inner end (beginning (14) ), the pivot pins (30) are situated outside of the guide section member (33) at the penultimate telescopic section (13), and in the position fixed by the locking device are situated approximately in the plane of the upper guide flange (34), in the plane of division from the guide part (31).

5. Telescopic boom according to claim 4, characterised in that the outer portion (36) of the last telescopic section (15) comprises a slide shoe (37) which surrounds it externally and which is connected via links (38) to a supporting bracket (39) which in its turn is arranged securely on the end (12) of the penultimate telescopic section (13).

6. Telescopic boom according to one of claims 1-5, characterised in that the first telescopic section (4) and the penultimate telescopic section (13) are connected by a rope (44) which is guided over spacer elements (40) and which serves as an un- derboom member (41) and which shortens automatically (e.g. by means of a supply tension roller (42) ), and which is tensioned by the bending forces when securing is effected (e.g. by a clamping device (43) ) after the locking of the trussed telescopic sections.

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