Patent ID: 12187352

DETAILED DESCRIPTION

FIG.1shows a construction machine for working a ground pavement which may also be referred to as a ground surface. The construction machine comprises travelling devices3. The travelling devices3may be wheels or tracked ground-engaging units. The tracked ground-engaging units may be referred to as tracks. The construction machine further comprises a machine frame5. The machine frame5is preferably connected to the travelling devices3by means of lifting columns. The distance between the machine frame5and the ground pavement may thus be adjustable.

The travelling devices3may alternatively also be rigidly connected to the machine frame5.

A working device9is preferably arranged on the machine frame5, which can be used to work the ground pavement.

An operator platform11is arranged on the machine frame5. A driver may stand or sit on the operator platform11and operate the construction machine.

A protective canopy13adjustable in height by means of a telescopic guide unit2may be arranged on the operator platform11. The telescopic guide unit2may also be referred to as a telescopic guide2.

It can be inferred fromFIG.2that the telescopic guide unit2comprises at least one first telescopic element4and one second telescopic element6, wherein the first telescopic element4is at least partially guidable in the second telescopic element6. The first and second telescopic elements4and6may be first and second telescopic tubes4and6, which may be square tubes.

Furthermore, a driving device10is provided for moving the protective canopy13up and down. The driving device10may be referred to as a telescopic drive10or simply as a drive10.

A detail fromFIG.2is depicted inFIG.3, in which the telescopic guide unit2and the driving device10are depicted in more detail. The telescopic guide unit2comprises the first telescopic element4and the second telescopic element6, wherein the first telescopic element4is at least partially guidable in the second telescopic element6. The second telescopic element6is preferably connected directly or indirectly to the machine frame5.

When the first telescopic element4is guidable in the second telescopic element6, and the first telescopic element4is adjusted relative to the second telescopic element6, the part4a, which projects relative to the second telescopic element6on the side30of the second telescopic element6, is lengthened or shortened. As a result, the protective canopy may be adjusted in height relative to the second telescopic element6and thus relative to the machine frame5.

FIG.4shows a sectional view ofFIG.3in the direction4-4depicted inFIG.3.

A latching element12is depicted inFIG.4. The latching element12may also be referred to as a latching lever12. The latching element12is arranged to pivot about a pivoting axis16on the second telescopic element6. The latching element12comprises a first part18and a second part20. Furthermore, the first telescopic element4comprises at least one recess14. The latching element12is shaped in such a fashion that, by means of moving the first telescopic element4relative to the second telescopic element6in a first direction B, the first part18of the latching element12is pivotable into the recess14and the second part20of the latching element12presses against the outer side22of the first telescopic element4from outside.

When the first telescopic element4is moved relative to the second telescopic element6in the direction B, and the recess14is at the height of the first part18of the latching element12, the latching element12pivots in the direction36as a result of the weight force of the latching element12and/or as a result of a spring element15into the recess14. As schematically shown inFIG.4the spring element15may be in the form of a coil spring wrapped around the bolt defining the pivoting axis16, with a leg15.1of the spring element15engaging the latching element18to bias the latching element18in a clockwise direction about axis16. The second part20of the latching element12then presses against the outer side22. Once the latching element12is in the latched-in position, further movement of the first telescopic element4relative to the second telescopic element6in a first direction B is no longer possible, since the second part20of the latching element12is already pressing against the outer side22of the first telescopic element4and therefore further pivoting movement of the latching element12is not possible. The first telescopic element4is, as it were, in a stop position. If an additional force is applied to the first telescopic element4in the first direction B, this merely increases the force that the first telescopic element4exerts on the first part18of the latching element12, and thus indirectly also increases the force with which the second part20of the latching element12presses against the outer side22of the first telescopic element4.

The first direction B preferably essentially acts in the same direction in which the weight force acts, i.e. in the direction of gravity, so that, in the latched-in position, the total weight force of the first telescopic element4and the protective canopy13connected to the same acts on the first part18of the latching element12and the latching element12is pivoted in the direction36, so that the second part20of the latching element12presses on the outer side22of the first telescopic element4.

In the latched-in position, the first part18of the latching element12is in the recess14, and the second part20of the latching element12is pressed against the first telescopic element4in such a fashion that the first telescopic element4jams or cants in the second telescopic element6, or may be locked in place, respectively. This has the advantage that vibrations and rattling are significantly reduced, since the first telescopic element4is canted in this position in the second telescopic element6.

FIGS.3and4further depict an adjustment element8realized as a lever element, the function of which is explained in more detail in the further figures. Adjustment element8may be referred to as an adjustment lever8.

FIG.4depicts guide elements50,52,54, which are arranged on the second telescopic element6and guide the first telescopic element4in the second telescopic element6. The guide elements50,52are sliding guides, and the guide elements54are guide rollers. The guide elements52are adjustable so that the play is adjustable with which the first telescopic element4is guidable in the second telescopic element6.

FIG.4furthermore depicts a second direction C, which is opposite to the first direction B. When the first telescopic element4is adjusted relative to the second telescopic element6in the second direction C, the latching element12pivots in the direction of rotation40, because the first part18of the latching element12is moved, together with the recess14, in the second direction C. As a result, the latching element12pivots in the direction of rotation40. The first part18of the latching element12may have a contour18.1configured such that, by means of moving the first telescopic element4relative to the second telescopic element6in the second direction C, the first part18of the latching element12pivots out of the recess. As a result, the first part18of the latching element12pivots out of the recess14, and the second part20of the latching element12also pivots away from the outer side22. The first telescopic element4may then be arbitrarily adjusted in the second direction C until the protective canopy13has reached the desired height. When the protective canopy13is at the desired height, the telescopic element4may be guided in the first direction B again. Once the first part18of the latching element12is then at the height of a recess14, the first part18of the latching element12may pivot into a recess14again, and the second part20of the latching element12may press against the outer side22of the first telescopic element4again.

When the protective canopy13is to be fully retracted, however, the latching element12must be brought into a retract position.

Said retract position is depicted inFIG.5. For this purpose, the first telescopic element4is first moved relative to the second telescopic element6in the second direction C again. As a result, as previously described, the first part18of the latching element12pivots out of the respective recess14and the second part20of the latching element12no longer presses against the outer side22. If the protective canopy13is then to be fully pivoted-in, however, the adjustment element8is operated in such a fashion that the latching element12remains pivoted in the pivoting direction40. This may be effected manually or also by means of a motor. The retract position is depicted inFIG.5. In this case, the first part18of the latching element12, as well as the second part20of the latching element12, are pivoted away from the outer side22of the first telescopic element4. The first telescopic element4may then be guided with play in the second telescopic element6, and the telescopic element4may be guided in the first direction B, which leads to the protective canopy13being retractable.

FIG.6depicts, for example, the protective canopy13or a part of the protective canopy13in the retracted position. The part4aof the first telescopic element4is relatively small on the side30of the second telescopic element6, whereas the part4bof the first telescopic element4is relatively large on the second side32of the second telescopic element6.

FIG.7depicts a different view, from which it can be seen that a plurality of recesses14are provided in the first telescopic element4, into which the first part18of the latching element12may be pivoted. The protective canopy13may thus be locked at a plurality of heights. The contour of the latching element12, as well as of the first part18of the latching element12and of the second part20of the latching element12, as well as the position of the pivoting axis16, is determined by means of tests in each case on specific machines, in which process it must be ensured that the first part18of the latching element12may pivot into the recess14and, in the pivoted-in position, the second part20of the latching element12may press against the outer side22of the first telescopic element4, and that the first part18of the latching element12may be pivoted out of the recess14when the first telescopic element4is moved in the second direction C. Tests are also performed to determine how great the distance between the first part18and the second part20of the latching element12and the pivoting axis16must be in order for the second part20, in the pivoted-in position, to be able to press against the first telescopic element4with sufficiently great force, so that vibrations and rattling no longer occur or occur to a reduced degree.