DE8702582U1 - Activated dumper bucket - Google Patents

Description

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CMPI-INO. H0R8TRo·*!JWlUW,ftplflKOSEL DIPPING. PETERSOBIAN

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2UQEUMeEN AT THE EUROPEAN PATENT OFFICE - EUROPEAN PATENT ATTORNEYS

Pttmtotmma aflaMCo·* A Sottech Odastrasse4a Paatftteh 129,^3863 Bad Qanderaheimi PO Box 129

D-3363 Bad Ganderheim 1 19 February 1987

Telephone (O 53 82) 40 38

Telex 957422 siedpd Tetegramm address: Siedpatent Badgandersheim YourFile No.: V

. Our file number: 1774/912 %

Salzgitter Machinery and f Investments Public Limited Company DESCRIPTION Activated dumper bucket

The invention relates to a shovel according to the preamble of claim 1.

In a known shovel of this type (DE-Offenlegungsschrift 28 13 202, Fig. 4 to 6), the front ends of all impact tools are in a common plane. The chopping or crushing of loose, overly large rock slabs or chunks without sufficient visual control from the operator's seat causes difficulties if only one outer impact tool hits the rock due to relative tilt. This first impact tool is then improperly loaded and does not achieve full impact power due to its shaft being tilted. It is cumbersome and often difficult for the operator to use more than the first impact tool. The crushing operation is then uneconomical.

-2-PK/La

Bank account: NORD/IB. NL Bad Gandesham (bank code 278 537 Ji), Klonte !^118 ^ÖVhjfJgirokorta PostaJnoamt Hannover (bank code 250100 30). Account no. 66715-30S

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This task is solved by the features of claim 1. This ensures that the middle impact tool is usually the first to come into contact with the rock to be chipped and can immediately develop its full power. The middle impact tool penetrates the rock relatively quickly due to the high specific impact power. This means that the neighboring impact mechanisms, at least on one side of the middle impact tool, also come into contact with the rock relatively quickly and participate in the chipping. If the shovel and the rock to be chipped are initially relatively tilted, several impact tools will usually come into contact with the rock and can develop their full power.

The design according to claim 2 reinforces these advantages because with the arrowed arrangement of the impact tools the probability is particularly high that several impact tools come into action at the same time when the shovel and rock are initially relatively inclined.

The features of claim 3 also promote the shovel's cutting performance. If wear occurs in the area of the shafts of the impact tools, this increasingly leads to the impact tools rotating around their longitudinal axis. This is a very undesirable situation that soon leads to the dumper being shut down and repaired. According to claim 3, this is counteracted by very early mutual support of the impact tools, so that the impact tools cannot rotate around their longitudinal axis or can no longer rotate to any significant extent.

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The invention is explained below using the embodiment shown in the drawings, from which further features and advantages of the invention can be seen. It shows:

Fig. 1 the top view of a bucket of a dump truck and

Fig. 2 the sectional view along line H-II in Fig. 1.

In Fig. 1, a bucket 1 of a dump truck is pivotable about an axis 2 and is hinged to a head piece 3 (only partially shown) of a boom of a dump truck.

The bucket 1 has a box 4 with side walls 5 and 6, a rear wall 7 and a bucket base 8. Each of the side walls 5, 6 carries a guide rail 9 and 10 inside for a guide element 12 that can be moved therein and a hydraulically operated unloading slide 13.

The shovel base 8 forms an impact device housing 17 together with a front cross member 14, a rear cross member 15 (Fig. 2) and a base plate 16 (Fig. 2). The rear cross member 15 is screwed to the shovel base 8. The base plate 16 is also detachably attached to other parts of the impact device housing 17.

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The impact device housing 17 accommodates five self-aligning devices 18 next to one another, all of which are designed in the same way. Each impact device 18 has, as shown in Fig. 2, a hydraulic impact mechanism 19 with a working piston 20 and an impact tool 21 to 25 designed as a chisel. Each impact tool 21 to 25 is guided with a shaft 26 in a guide bushing 27 made of bronze so that it can be moved lengthwise. A lateral milling 26 of the shaft 26, as shown in Fig. 1, collides with a heavy-duty clamping pin driven into a hole in the front cross member 14 and, in a manner known per se, prevents the shaft 26 with the impact tool 21 to 25 from rotating about its longitudinal axis 29.

A housing tube 30 of the impact mechanism 19 is supported on the impact device housing 17 on the right in Fig. 2 via the rear cross member 15. In the rear cross member 15 there is a cross hole 31 which is supplied with hydraulic fluid from a supply line 32 and distributes the hydraulic fluid to the five hydraulic impact mechanisms 19. Similarly, in the rear cross member 15 there is a cross hole 33 which connects all five impact mechanisms 19 to a return line (not shown).

On the left in Fig. 2, a spring arrangement 34 made of ring-shaped disc springs surrounding the working piston 20 rests against the front of the housing tube 30 under compression preload. The disc spring on the left in Fig. 2 rests against a flange 35 of a retaining bush 36 which accommodates the guide bush 27.

The retaining bush 36 overlaps a front end of the front cross member 14 with a front flange 37 and is fixed to this front end with screws 38 (Fig. 1).

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According to Fig. 1, the middle striking tool 21 projects forwards beyond the neighboring striking tools 22, 23. The striking tools 22, 23 in turn project forwards beyond the striking tools 24 and 25 that adjoin them to the outside. This results in an arrowed arrangement for the striking tools 21 to 25 as a whole.

All impact tools 21 to 25 have a very low

lateral distance 39 from each other. If there is in the area §

the guide of the shaft 26 shows signs of wear and the relevant impact tool 21 to 25 tends to rotate about its longitudinal axis 29,

the lateral distance 39 to zero, so that the &idigr;

Rotation-inclined impact tool on the adjacent £ impact tool and thus its rotation '%

around the longitudinal axis 29 is prevented. S

Claims (2)

PROTECTION CLAIMS 1. Bucket (1) hinged to a boom (see 3) of a loader, wherein a bottom cutting edge of the bucket (1) is activated by several impact tools (21 to 25) of impact devices (18) arranged next to one another, characterized in that a middle one (21) of the striking tools (21 to 25) extends forwards beyond adjacent striking tools (22 , 23). 2. Shovel according to claim 1, characterized in that starting from the middle striking tool (21), all other striking tools (22 to 25) are arranged offset towards the outside, increasingly rearwardly relative to the middle striking tool (21), so that overall an arrow-shaped bottom cutting edge is obtained. -2-PK/Hu Bank address: NOAD/Lft NL Bad Gandereheim (BU 27ft£tf? *), Kfo.«rV.4a «1&bgr;«7&thgr;*« Account number: Postgiroamt Hannover (BLZ 2S0100 30), Kto<-No. 66715-31 mi »> ft · ■ a · ^ < 3* Shovel according to claim 1 or 2, characterized in that adjacent striking tools (21 to 25) have a very small lateral distance (39) from one another, so that in the event of wear on a shaft (26) of the striking tools (21 to 25), rotation of the striking tools (21 to 25) about their longitudinal axis (29) is prevented by mutual lateral rotational support.