This invention relates to a device for mechanically splitting cleavable objects, especially blocks of wood. Two main types of splitting machines for mechanical cleavage of wooden blocks are today found on the mar- ket. One of said types has a fixedly mounted splitting knife against which the block of wood is pressed by a means exerting a force so that the splitting knife will cleave the block. The other machine type operates so that a conical means provided with a male thread is screwed mechanically into the block, said means splitt¬ ing the block at screwing and effecting the desired cleavage thereof in this way.

It is the object of the invention to provide a de¬ vice for mechanical cleavage of wood enabling a higher cleaving capacity than what is usually normal, simul¬ taneously as the construction of the device is relati¬ vely simple, and this object is achieved in that the device has been given the characteristic features de¬ fined in the claims. One advantage of the invention in comparison with previously known solutions is that the invention offers a device for mechanical cleavage of pieces of wood, etc, the cleaving capacity of which is very high and the re¬ quired power of which is low. Moreover, the construction of the device of the invention is very simple.

Illustrative examples of the invention will be de¬ scribed in greater detail below with reference to the enclosed drawings, in which Fig 1 is a schematic later¬ al view of a mechanical wood splitting device according to the invention. Fig 2 is a perspective view of the de¬ vice as seen from its inlet side. Fig 3 is a schematic view of the device as seen from its outlet side. Fig 4 is a lateral view on a larger scale of a splitting de¬ vice according to the invention and Fig 5 is a section of the splitting device taken along the line V-V in Fig

SUBSTITUTE SHE K

The mechanical wood splitting device 1 comprises two splitting means in the form of splitting wheels 2 which are fixedly connected to axles 3 and 4 support¬ ing the splitting wheels. The axles 3 and 4 are sup- ported by the frame 6 of the wood splitting device 1 via bearings 5. The axles 3 and 4 support at one of their ends pulleys 7 and 8. Furthermore, the wood splitting device is provided with a drive means in the form of e g an electric motor 9 which supports a pulley 10 on its drive shaft. The frame 6 also supports a stretch roll which is arranged to be movable and by means of which the tension of a drive belt 12 can be adjusted. How the drive belt 12 is drawn is apparent from Fig 1 and the motor 9 drives the splitting wheels 2 in the directions shown by the arrows A and B.

The wood splitting device 1 comprises further a guide chute 20 extending through the whole device 1 and having recesses for the splitting wheels 2. The guide chute 20 has an inlet 21 and an outlet 22. In the guide chute 20 between the inlet 21 and the splitting wheels 2 there is arranged a centering device 23. The centering device 23 comprises' a V-shaped bottom plate 24 which is articulatedly connected to the guide chute 20 at its end 25 located immediately at the inlet 21 of the guide chute 20. Moreover, the centering device 23 comprises two side plates 26 and 27 which are also articulatedly connected to the guide chute 20 at their ends 28 and 29, respectively, facing the inlet 21 of the guide chute 20. A resilient means in the form of e g a rubber band 30 holds in its inactivated state the bottom plate 24 and the side plates 26,27 against each other, as shown in Fig 2. At its ends the rubber band 30 is connected with the side plates 26 and 27, bears upon the underside of the bottom plate 24 and lifts this. The design of the splitting wheels 2 is best appa¬ rent from Figs 4 and 5. In the illustrative example shown the splitting wheels 2 have eight teeth 40 with a tooth point 41. There are transitional edges 42 between the teeth 40 on the side surfaces of the splitting

wheels 2.

The mechanical wood splitting device 1 of the in¬ vention operates as follows. The wooden blocks to be split are fed in their longitudinal direction in the guide chute 30 from its inlet side 21. According as new wooden blocks are supplied the block in front is dis¬ placed ever more into the chute 20 in the direction C. When a wooden block 50 enters the centering device 23 it actuates the latter so that the side plates 26 and 27 are removed from each other in dependence on the size of the wooden block 50 and so that the bottom plate 24 moves downwards in dependence on the weight of the wooden block. A well functioning centering of each wood block 50 can be achieved in this way by using a resilient means 30 suitable for the purpose. When a wooden block 50 thus centered during its feeding reaches the constantly rotat¬ ing splitting wheels 2 these provide the continued feed¬ ing of the current wooden block. Simultaneously the wood¬ en block is divided into two parts by the splitting wheels at its passage past these and the split block parts are also thrown out of the wood splitting device 1 through its outlet 22 by the splitting wheels.

The transitional edges 42 of the splitting wheels 2 aid in throwing out split blocks. As the split wooden blocks are thrown one meter or two from the block splitt¬ ing device the need of a following conveyor for trans¬ porting away the split block from the vicinity of the wood splitting device is mostly eliminated. Moreover, it can be mentioned that the mechanical block splitting de- vice 1 is easily movable as it is provided with two wheels 60 and two legs 61.

If the splitting means 2 are designed so that they have a great mass-moment of inertia and are rotated at a high angular speed a very high splitting capacity of the wood splitting device is made possible.

It should be realized that the rotational drive of the splitting means 2 can be achieved within the scope

of the invention in a plurality of different ways in ad¬ dition to that shown in the illustrative example. It is e g possible to make oneself independent of current supp¬ ly by choosing e g one or two combustion engines instead of an electric motor. As to the rotational drive of the splitting wheels there is also a possibility of provid¬ ing only one thereof with a drive and have the other splitting wheel rotating freely.

As to the form of the splitting means 2 a series of alternative embodiments are possible in addition to the form provided with teeth. However, the outer form of the splitting wheel should preferably deviate from a quite circular one and the outer form of the wheels can e g be like a polygon or square. The form and side of the two splitting means need not necessarily be mutually similar, either.

A device according to the invention can be made ex¬ tremely safe in respect of accident prevention as feed¬ ing of wooden blocks to the splitting means 2 due to the length and form of the .guide chute 20 must be carried out so that the current wooden block to be cleft is fed by pushing it by means of a following wood block. Otherwise there are good possibilities of safely encapsulating the splitting means as well as the transmission for the drive of the splitting means. The outlet 22 of the guide chute 20 can be covered e g by a resilient rubber plate.

Thus, the invention is not limited to what has been shown and described but amendments and modifications are possible within the scope of the following claims.

SUBSTITUTE SHEET