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Machine translation
1. (WO2000057957) APPARATUS FOR SEPARATING CASTINGS
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

APPARATUS FOR SEPARATING CASTINGS

The invention relates to an apparatus for moving apart components for separating, comprising:
- a basic body;
- two engaging elements which are both coupled to the basic body by a rocker;
- a wedge-shaped body movable between the engaging elements for causing the engaging elements to move apart; and
- a linear drive element which is connected on one side to the basic body and on its other side to the wedge-shaped body.
Such an apparatus is known from EP-A-0 525 142.
In this prior art apparatus the engaging elements are coupled to the basic body by pivoting levers. Worn engaging elements are hereby not easy to replace.
Undesired play will also occur at the many pivot points due to wear. In addition, the engaging elements are urged toward the wedge-shaped body by external springs arranged at the connecting shafts between the engaging elements and the lever system. There is therefore the danger of such springs being damaged by the workpieces for
separating.
A similar apparatus is also known from
EP-A-0 025 197. The engaging elements are herein
connected slidingly to the wedge-shaped body so that springs are unnecessary. Worn engaging elements are however not easy to replace either as a result, while here also undesired play will occur at the many pivot points due to wear.
The object of the present invention is to provide such an apparatus wherein the above stated problems are obviated.
This object is achieved in that each of the rockers hooks with one end in the engaging element and the other end is urged outward by a spring placed in the basic body and the rocker comprises a point of rotation placed between the ends and connected to the basic body.
As a result of these measures the springs, which press the engaging elements against the wedge-shaped body, are placed on the side of the basic body so that they are present in a protected position and there is less danger of damage.
As a result of these measures there is a strong connection between the engaging element and the rocker which is not obstructed even in the case of possible fouling; the rotation points are after all located much further inward so that the rotation points and the heavily loaded bearings placed here are protected against fouling.
According to a preferred embodiment the linear drive element is accommodated in the basic body. This results in a simple and compact method of construction.
According to another preferred embodiment the rockers, the wedge-shaped body and the engaging elements are each bounded by the same two flat, parallel bounding surfaces. This also results in a simple construction, wherein the diverse components are easily accessible.
According to another advantageous embodiment
bounding plates are arranged between the bounding
surfaces and the rockers . These bounding plates serve to protect the mechanism.
According to a preferred embodiment the engaging elements are guided in the length direction of the wedge-shaped body by additional guide means.
Although in principle guiding also takes place by means of the engagement between the rockers and the engaging elements, the use of guide means enables a less firm coupling between the engaging elements and the rockers which, as stated in claim 8, makes it possible to connect the engaging elements releasably to the rockers. This release capability enables rapid and easy replacement of the engaging elements, which are highly subject to wear.
The replacement procedure is greatly simplified when the rockers can be coupled to fixation means for fixing of rockers in a driven-apart position to enable
replacement of the engaging elements. The wedge-shaped body is initially driven as far forward as possible herein so that the engaging elements reach their extreme position. In this position both rockers are fixed by means of the fixation means, for instance in the form of a bracket. By then moving back the wedge-shaped body the engaging elements are released and can be easily
replaced.
According to yet another preferred embodiment the engaging elements are provided with protruding cheeks at the position of the ends of the bounding plates .
These cheeks ensure that when the castings to be detached are engaged they are prevented from contacting the interior of the apparatus .
According to a further preferred embodiment the basic body is connected to a support bracket for rotation in its axial direction and the support bracket can be coupled to suspending means. This provides the user with the necessary freedom for handling the apparatus, which is too heavy to be held by hand for long.
According to a final preferred embodiment a handgrip protruding substantially in radial direction is arranged on the basic body, which results in the apparatus being somewhat easier to handle.
The present invention will be elucidated hereinbelow with reference to the annexed figures, in which:
figure 1 shows a perspective view of an apparatus according to the invention;
figure 2 shows a perspective view corresponding with figure 1, wherein the apparatus is suspended from a chain and the spreading elements themselves are rotated through 90°;

figure 3 shows a view corresponding with figure 2, wherein the spreading apparatus is rotated back to its original form;
figure 4 shows a view corresponding with figure 1, wherein a number of elements are removed; and
figure 5 is a partly perspective, partly cross-sectional view of an apparatus according to the
invention, wherein the engaging elements are separated.
The spreading apparatus according to the present invention is formed essentially by a basic body 1 in which is arranged a hydraulic cylinder 2. Piston 3 of hydraulic cylinder 2 is connected to a wedge-shaped body 4. For operation of hydraulic cylinder 2 a substantially cylindrical control element 5 is arranged on its end which is provided with connections for connection to a feed line 6 for hydraulic pressure and a drain line 7.
Arranged on either side of wedge-shaped body 4 are two engaging elements 8 which are provided on their inner side with a groove 9. Fitting into groove 9 is a ridge 10 arranged on the slide surfaces of wedge-shaped body 4. Using these grooves and ridges it is possible for the engaging elements to slide in the length direction along either side of wedge-shaped body 4. Engaging elements 8 are further provided with a protrusion 11 which is in turn also provided with a groove 12. Protrusion 11 protects the sides, located further toward the cylinder, of the contact surfaces between wedge-shaped element 4 and the engaging elements against the effects of fouling. Further toward the inside engaging elements 8 are provided with a recess 13. This recess 13 serves for coupling to the rockers 14 which are provided on one of their ends with a cam 15. Rockers 14 are connected by means of pins 16 to the coupling plates which are
connected with bolts 18 to basic body 1. Compression springs 19 are arranged between the free end of rocker 14 and an associated surface of basic body 1.
The whole, thus formed construction is closed on both sides by cover plates 20 which protect the internal mechanism against the influences of dust, splinters and the like.
In the apparatus described up to this point the rockers serve to push the engaging elements into
engagement with the associated surfaces of wedge-shaped body 4. Use is made herein of the pressure generated by compression springs 19.
Figure 5 shows that two temporary fixation pins 23 are arranged through rocker 14 and plate 20 so that rockers 14 are fixed in their position drawn in figure 5, whereafter it is possible to replace the engaging
elements 8 which are subject to wear.
Around basic body 1 is further arranged a ring 24 to which a bracket 26 is fixed by means of connecting pieces 25. In connecting piece 25 is arranged an opening to which a chain 27 can be attached. With the thus shown combination of elements the tool can be suspended, wherein ring 24 is rotatable relative to the actual tool, so that the actual tool can rotate in its entirety relative to bracket 26.
Finally, an auxiliary handgrip 28 is arranged which is mounted on operating body 5. Arranged on the end of this auxiliary handgrip is a button 29 with which the hydraulic device can be operated. It is of course
generally possible to choose from different operating methods for this purpose; a situation is now recommended by the inventors wherein the hydraulic tool will spread when a button 29 is depressed and will return to its original position when the button is released.
It will be apparent that diverse modifications can be made to the shown configurations.