DE29509819U1 - Attachment device for a street cleaning vehicle for holding a front attachment - Google Patents

Description

jln fire device for a street cleaning vehicle for a front attachment

ftnwe.prfrtncrfigp.biet of the invention
The present invention relates to an attachment device for a street cleaning vehicle for holding a front attachment, which is provided with a pivoting telescopic rod for changing sides of the front attachment and has a collision protection mechanism. Modern street cleaning vehicles have a universal attachment device attached to or near the front bumper for holding various attachments that can be positioned centrally or to the side. Only the latter device category is relevant here.

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If necessary, the front attachment can be moved from one side of the street cleaning vehicle to the other. The front attachment, which is mounted on a telescopic rod, can be extended beyond the long sides of the street cleaning vehicle. To avoid damage to the front attachment and its suspension, a spring-loaded pivoting of the front attachment is provided in the event of a collision using a collision protection mechanism, which responds to the external force caused by a collision with an obstacle. The street cleaning vehicle is typically a motor-driven, vehicle-like street sweeper with a driver - who is also the operator. Front attachments include front disc brushes, weed brushes, front scrapers and rail cleaners.

To simplify language usage, the abbreviated terms sweeper and attachment are also used

Technology

Various design solutions for mounting attachments are known from literature and the market. The attachment is usually designed in such a way that the attachment in question can only be mounted on the right-hand side of the sweeper - as seen from the driver's cab. Such attachments can be found, for example, in the brochures "Kehrmaschine KM 2302" from KROLL - Fahrzeugbau, Berlin/Germany, and "SK 6000" from SCHMIDT GmbH, St. Blasien/Germany. Modern attachments are equipped with the aforementioned collision protection mechanism to prevent major damage to the attachment and its suspension in the event of a collision. The collision protection mechanism traditionally consists of a rod attached to the attachment holder, to the side of the vertical axis of rotation, which leads into a compressed air cylinder. When a force is applied to the attachment from the front, the bracket pivots against the pneumatic cylinder around the axis of rotation. However, these attachments do not have the option of alternatively arranging an attachment close to the opposite long side. This is a disadvantage if changing the side of the attachment is desirable for the specific local space conditions in the area to be traveled.

On some types of sweepers, the attachment device allows the attachment to be mounted close to either of the two

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long sides. However, the conversion involves considerable assembly work and, in addition, a right-hand or left-hand bracket is required for the attachment. A collision protection mechanism can be integrated into the respective bracket. Such attachment devices are tedious and cumbersome to handle in practical operation and expensive to purchase.

To make conversion significantly easier, attachments have been developed in which the extendable telescopic arm with the attachment holder located at the front can be pivoted from one long side of the sweeper to the other around a pivot axis provided in the middle of the attachment. Attachments of this type are disclosed, for example, in the brochures "Street cleaning machine MFH 4200" from Maschinenfabrik Hochdorf AG, Hochdorf/Switzerland, and "DANLINE-SCARAB WESD RIPPER" from SCÄRAB SALES LTD., Marden/England. With these attachments, which allow a relatively quick change of sides, the spring-loaded pivoting of the attachment in the event of a collision with an obstacle has so far only been implemented in one of the two side positions - conveniently in the primary position which is mainly used. If the attachment changes sides to the secondary position by turning the telescopic boom around the axis of rotation mentioned, the collision protection mechanism on the hitherto known attachments is ineffective. Even in the case of harmless collisions - between the attachment and obstacles such as gutters, trees, hydrants, etc. - which can never be completely avoided due to the limited visibility of the driver,

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are to be closed, there is a considerable risk of damage due to the rigid, unyielding suspension of the attachment in the secondary position.

The known attachments have serious imperfections. Either the attachments are structurally complex and also relatively complicated in practical use - this leads to higher acquisition and operating costs - or they are only equipped with an effective collision protection mechanism in the primary position. The lack of collision protection in the secondary position causes at least occasional damage, which drives up the costs for repairs and spare parts. In addition, the cleaning quality in the secondary position will be lower, as the driver of the sweeper tends to avoid obstructive objects by a wide margin in order to avoid collisions.

Object of the invention

In view of the disadvantages of the existing attachment devices, the invention is based on the following problem. The aim is to create an attachment device for a sweeper with a holder for attaching an attachment, wherein the holder is located on a telescopic arm which can be pivoted into the primary or secondary position and in both positions a collision protection mechanism is effective.

the invention

The principle of the inventive solution to the above-mentioned problem is defined in independent claim 1;

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preferred design details emerge from the dependent claims. The essential features of the invention are that at the free end of the arm extension of the telescopic arm, a collision rotation axis is provided on which the device holder and the collision protection mechanism, which can be switched between the primary and secondary positions, are arranged. The collision protection mechanism has a turntable to which the piston rod of a damping cylinder is hinged; on the other hand, the damping cylinder is hinged to a flange which sits on the telescopic arm. The turntable can be locked in two positions - here offset by 140° - relative to the device holder, whereby the rotation positions of the primary and secondary positions are assigned to the entire attachment device. The reversal of the position of the piston rod hinged to the turntable, which is caused by the change in position, is reversed again as a result of the rotation of the turntable.

Thanks to the invention, an attachment device is now available that, with relatively little design effort, in a short changeover time and with just a few simple steps, enables an attachment to be swiveled from the primary to the secondary position or vice versa, with a collision protection mechanism coupled to the attachment holder being effective in both positions. In both the primary and secondary positions, the attachment can be deflected from the working position peripheral to the sweeper to under the sweeper in the event of a collision with an obstacle - against the effect of a pneumatic cylinder. The driver of the sweeper can approach the obstacles in the area to be cleaned with less risk.

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approach obstacles and thus achieve greater cleanliness. If a collision occurs, serious damage is avoided by the elastic, pivoting bracket.

Drawings npri Ansfühmnasbe!spiel

The following is a detailed description of an embodiment of the attachment device according to the invention, with possible modifications being mentioned at the end, based on the accompanying drawings. They show: 10

Figure 1 is a front view of the complete attachment with a front brush as an attachment,

Figure 2 shows the top view according to Figure 1;

Figure 3 is a front view of the attachment device in the area between the flange attached to the telescopic arm and the carrier head and

Figure 4 shows the top view according to Figure 3.

Figures ~\ and . ? _t

In a manner known per se, the entire attachment device consists of a console 100, a telescopic rod 200, a device holder 300, the adjustment device 400 and the collision protection mechanism 500 designed according to the invention, whereby in particular the device holder 300 and the collision protection mechanism 500 work together and therefore cannot be clearly separated from one another.

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The console 100 is designed to be attached to the bumper of the sweeper. In the middle of the horizontally extending console 100 there is a bearing 110, on which the telescopic rod 200 - formed from the outer guide tube 210 and the inner extendable telescopic arm 220 - is pivotably arranged at the bottom. The telescopic arm 220 is driven by a telescopic cylinder (not shown). The guide tube 210 is surrounded by a telescopic holder 230, which is connected to the bearing 110 and represents the vertical main axis of rotation Dl.

To lock the telescopic rod 2 00 in the two alternative working positions - the primary position Pl and the secondary position P2 - two opposing plug sleeves 231, 232, located on either side of the main axis of rotation Dl and open at the top, are provided on the telescopic holder 230. Complementary to the two plug sleeves 231, two holes 101, 102 are provided in the console 100.

In the locked state - here in the primary position Pl, a locking bolt is inserted into one of these holes 101, which on the other hand is located in the corresponding plug sleeve 231. If the telescopic rod 200 is to be swiveled by 180° into the secondary position P2, the locking bolt 233 must first be removed and, after swiveling, inserted through the hole 111 into the plug sleeve 232.

At the front, a flange 240 is attached to the telescopic arm 22 0. An arm extension 2 50 is rigidly attached axially to the flange 240, as well as a damping cylinder 510 operated with compressed air, which is part of the collision

The arm extension 250 extends to the collision rotation axis D2, on which the device holder 300 is pivoted horizontally. The collision protection mechanism 500 is also located on the collision rotation axis D2. The adjustment device 400, which leads to the support head 600 and has the usual rods, is attached to the device holder 300 .

In the example here, a front disc brush is mounted on the carrier head 600 as an attachment to 700. The adjustment device 400 essentially consists of the lifting cylinder 410 for the up and down movement of the carrier head 600 and two adjustment screws 420, 430 for adjusting the inclination of the attachment 700 mounted on the carrier head 600. Hydraulic cylinders can also be used instead of the adjustment screws. A disc brush, for example, should generally be inclined in such a way that during the sweeping process a contact pattern is set so that the disc brush rests on the ground with a third of its circumference.

Figures 3 and 4

Coming from the flange 240, the arm extension 250 extends in the direction of the collision rotation axis D2, with the end piece of the arm extension 250 protruding into the lateral opening of the U-shaped device holder 300. Located above the arm extension 250, the damping cylinder 510 is hinged with its rear part to the flange 240 and forms a cylinder rotation axis D3 here. The free end of the piston rod 511 of the damping cylinder Sl0 is also hinged to the collision protection mechanism 500*, namely in the rod rotation axis D4, away from the collision rotation axis D2.

Advantageously, in the working positions - the primary position P1 and the secondary position P2 - the device holder 300 is located on the collision rotation axis D2 in such a way that the attachment 700 mounted on the carrier head 600 is set back in the direction of the sweeper with a swivel angle α * 10°. The swivel angle α is measured as the deviation between the vertical rod plane El pointing towards the carrier head 600 and the vertical front plane E2 running parallel to the front of the sweeper γ.

The device holder 300 consists of two horizontally arranged, spaced-apart plate segments 310, 320 and a vertical segment 330 connecting the two plate segments 310, 320, so that the device holder 300 has a U-shaped configuration. The collision rotation axis D2 runs vertically through the two plate segments 310, 320 and the end piece of the arm extension 250, which is enclosed in a fork-like manner by the device holder 300. On the top of the upper plate segment 310 there is an intermediate disk 520 acting as a sliding bearing, on which a turntable 530 rests that can rotate about the collision rotation axis D2. On the turntable 530, the free end of the extendable or retractable piston rod 511 is articulated peripherally - i.e. at a distance from the collision rotation axis D2 - in the rod rotation axis D4.

Compared to the vertical, the rod rotation axis D4 is offset in the direction of the carrier head 600, so that an offset angle γ is formed between the vertical and the axis formed by the collision rotation axis D2 and the rod rotation axis D4.

running straight line. In this case, y«10°. The arrangement of the rod rotation axis D4 at the offset angle γ optimizes the functionality of the attachment device in the event of a collision of the carrier head 600 or the attachment 700 mounted on it. Furthermore, it is only the offset angle y that enables the carrier head 600 to be pivoted in very far in the event of a collision or in the retracted rest position. In order to be able to drive out the piston rod 511 again when the carrier head 600 is fully pivoted in, it must still be in a positive inclined position.

Also peripherally and approximately opposite the rod rotation axis D4, a through hole S31 is provided in the turntable 530, below which there is a congruent first locking hole 311 arranged in the upper plate segment 310. A spring latch 540 that can be pulled out from above engages in both holes 531 and 311, i.e. through the intermediate disk 520, so that the turntable 530 and the device holder 300 are fixed against each other."

A second locking hole 312 is provided in the part segment 310 for the mutual fixation of the turntable 530 and the device holder 300 in the secondary position P2. Both locking holes 311, 312 are at the same distance from the collision axis of rotation D2, with an opening angle β of 140° between these holes 311, 312. The size of the opening angle β is generally determined by (ß) = 180»-2

In the secondary position &Rgr;2, as explained below, the spring latch 540 is engaged through the through hole 531 into the second locking hole 312.

If a collision occurs between the attachment 700 and an obstacle when the sweeper is in use, the device holder 300 pivots around the collision rotation axis D2 against the resistance of the damping cylinder 510 depending on the force applied. This causes the carrier head 600 with the attachment 700 attached to it to avoid the obstacle. By fixing it between the upper plate segment 310 and the turntable 530 - using the spring latch 540 - the pivoting movement acts on the piston rod 511 which is articulated in the rod rotation axis D4 and which is pushed into the damping cylinder 510 in proportion to the force applied. If the force is removed, the piston rod 511 pushes the device holder 300 back into the regular working position. With appropriate structural dimensioning, it is possible to provide for the attachment 700 to pivot horizontally up to . 80° from the working position - by collision with an obstacle or by moving into the rest position - and thus comes into cover under the sweeper.

Page change from the primary position Pl to the secondary position P2

It is advisable to first adjust the collision protection mechanism and then swing the entire telescopic rod 200 around the main axis of rotation Dl into the other position. The reverse side change is carried out in the same way. A side change is divided into the following steps:

only the steps relevant here are discussed:

1. Depressurize damping cylinder 510;

2. Pull out the spring latch 540 so that it is disengaged from the first locking hole 311;

3. Rotate turntable 530 220° clockwise around the collision rotation axis D2;

4. Advance the carrier head 600 by 20° around the collision rotation axis D2, away from the sweeper;

5. Insert the spring latch 540 into the second locking hole 312, which has now reached the through hole 531 as a result of the rotation of the turntable 53 0 and the advancement of the carrier head 600? 6. Swivel the entire telescopic rod 200 around the main

is rotation axis Dl in the secondary position P2 as explained in figures l and 2.

After these steps have been completed, the attachment 700 is on the other side of the sweeper and here also assumes the swivel angle α. At the same time, the rod pivot axis D4 is again at the offset angle γ. The collision protection mechanism 500 is ready for operation again.

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Claims (9)

protection claims 1. Attachment device for a street cleaning vehicle for holding a front attachment (700) with s a) a console (100) to be attached to the front of the street cleaning vehicle and b) a telescopic rod (200) pivotable about a main axis of rotation (Dl) in two working positions - primary position (Pl) and secondary position (P2) - with an extendable telescopic part (220) and c) a device holder (300) attached directly or indirectly to the telescopic rod (200) d) an adjustment device (400 5 for the up and down movement and lateral inclination of the carrier head (600) directly holding the front attachment (700) and e) a collision protection mechanism (500), characterized in that f) the collision protection mechanism (500) at the free end of the telescopic arm (220) or an arm extension attached to it (250) is connected to the device holder (300) in a common collision rotation axis (D2) and by switching in both positions (P1, P2) enables the carrier head (600) to be swung in towards the street cleaning vehicle, avoiding an obstacle, as a result of external forces acting on the carrier head (600). 2. Attachment device according to claim 1, characterized in that a) a flange (240) is attached to the free end of the telescopic arm (220), from which the arm extension (250) extends towards the collision axis of rotation (D2) and to which a damping cylinder (510) is articulated in a cylinder axis of rotation (D3) above the arm extension (250), which absorbs the effects of forces on the carrier head (600) and b) on the other hand, the piston rod (511) of the damping cylinder (510) is articulated on the collision protection mechanism (500) sitting on the collision rotation axis ( Ω2 ) in a rod rotation axis (D4) which is located away from the collision rotation axis (D2). 3. Attachment device according to claim 1 or 2, characterized in that a) the device holder (300) consists of an upper and a lower horizontal plate segment (310, 320) and a vertical segment (330) connecting them, which are joined together in a U-shape and b) the free end of the arm extension (250) extends into the U-opening, with the collision rotation axis (D2) running vertically through the device holder (300), and c) a rotating disk (530) rests on the upper side of the upper plate segment (310) , with a sliding bearing between 2s an intermediate disk (520) can be inserted between both and d) the turntable (530) can be locked in two positions, 180° apart, against the plate segment (310) located underneath. ■■■I ::": ··· &Ggr;": 4. Attachment device according to one of claims 1 to 3, characterized in that a) the piston rod (511) is hinged on the turntable (530) , away from the collision axis of rotation (D2) in a peripherally placed rod axis of rotation (D4) and b) there is a peripheral through hole (531) in the turntable (530) and c) in the underlying plate segment (310) two locking bores (311, 312) are provided which are offset from one another at an opening angle (ß), which can alternatively be brought into congruent alignment with the through-bore (531) by rotating the turntable (530), whereby a locking member (540) can be inserted through the through-bore (531) into the first or second locking bore (311, 312). 5. Attachment device according to claim 4, characterized in that the locking member is a spring latch. 6. Attachment device according to claim 1, characterized in that a) in the primary position (Pl) and in the secondary position (P2) the device holder (300) is seated on the collision rotation axis (D2) in such a way that the attachment (700) mounted on the carrier head (600) is set back in the direction of the street cleaning vehicle with a swivel angle (α) of «10°, whereby b) the swivel angle (α) is measured as the deviation between the vertical rod plane (El) pointing to the carrier head (600) and the vertical front plane (E2) running parallel to the machine. 7. Attachment device according to claim 2, characterized in that the rod rotation axis (D4) is offset in the direction of the carrier head (600) from the vertical by an offset angle (γ) which spans between the vertical and the straight line through the collision rotation axis (D2) and the rod rotation axis (D4). 8. Attachment device according to claims 4, &bgr; γ and 1, characterized in that the dimension of the opening angle (ß) is determined according to the relationship <ß) = λ8θ°-2[{α) + <γ>3 determined. 9. Attachment device according to claims 4 and to B, characterized in that the pivoting angle (α) and the offset angle (γ) are each in the range of 10*, resulting in an opening angle (ß) in the range of 14 0*.