Patent Application
20090194619
The present invention refers in general to apparatuses to be used for performing demolition works, for example for breaking up members of a building structure, such as concrete beams or pillars, or in quarries during works carried out in order to crush blocks, stones or similar materials.
More particularly, the invention relates to a crushing apparatus for demolition or similar works, of the type defined in the preamble of appended claim 1.
Apparatuses of the type known mentioned above are commonly used for breaking up structural members of buildings during demolition works, and comprise a main body intended to be removably associated to the free end of an articulated handling arm of an operational machine such as an excavator. A pair of jaws, which may be provided with teeth and/or shear blades, and at least one of which is movable, is associated to the main body. The movement of the movable jaws is controlled by actuators, usually consisting of a fluid cylinder, so that a member to be demolished can be grasped between the jaws of the main body, and it can be broken up as a result of the compressive force applied by driving the aforesaid actuators.
However, this manner of acting has the drawback of requiring a considerable time, since the breaking up action carried out by compression applied through the jaws is progressive and, after all, rather slow. In particular, breaking up of concrete bodies or stone blocks by compression requires a very high power, because crushing only happens if a pressure is attained which is higher than that corresponding to the compressive strength of the material, which is usually very high, while impact strength of such materials is smaller.
In order to solve this drawback, the subject of the invention is an apparatus having the features mentioned in the appended claims.
By virtue of the fact that the apparatus according to the invention is provided with percussion means associated with the main body, which are intended to apply a percussion force to the material to be demolished, together with the compressive action performed by the jaws, the demolition work turns out to be extremely effective and allows the time of demolition to be considerably reduced. Moreover, the demolition apparatus of the invention has a simple structure, and can be manufactured at a low cost starting from componentry which is mostly available on the market.
According to a preferred feature of the invention, the actuator means of the swingable jaws incorporate percussion means, so that the action of percussion is concentrated mostly on each swingable jaw.
In this manner, the jaws simultaneously carry out a concentrated action, both of compression and percussion, on a member to be crushed, and therefore perform a very effective breaking up action.
According to another preferred feature of the invention, the percussion means are associated with the main body of the apparatus in a manner independent of each swingable jaw, and include at least one demolishing unit provided with a respective tool projecting from the distal portion of the main body.
In this manner, the action of percussion of the demolishing unit is carried out when a member to be demolished is already firmly grasped by the jaws, which allows, on the one hand, that the action of percussion is applied to a preselected zone of the member and, on the other hand, that the breaking up action by compression of the jaws is made more effective, by virtue of the fact that percussion of the demolishing unit allows to weaken the member to be broken up, which makes easier breaking up thereof by compression.
Further characteristics and advantages of the invention will turn out to be clearer from the following detailed description, which has been provided as a non-limitative example and is referred to the appended drawings in which:
With initial reference to
The body 12 is usually rotatably mounted on a fifth wheel support member 18, in order to allow rotation thereof about its general axis with respect to the arm 16.
The second end 20, or distal end, of the body 12, opposite to the first end 14, is conveniently fork shaped being defined by a pair of appendages 22 which are preferably symmetrical with respect to the general axis of the body 12, a respective jaw 24, swingably mounted, being associated with each appendage.
In particular, each jaw 24 has a first portion of articulation 26 crossed by a first pin 28 which also engages a pair of coaxial holes of the respective appendage 22, and a second portion of articulation 30 crossed by a second pin 32 for articulation to a first end 40 of a fluid cylinder 34, usually of the double acting type, the opposite end of which is articulated to the body 12 at 36 through a third pin 38.
The cylinders 34 constitute actuator means for actuating the jaws 24, which are adapted to control the opening thereof with respect to the body 12 as a result of feeding and releasing a fluid through respective ducts (not shown) associated with the opposite ends of a working chamber 44 in which a piston 42 is slidably mounted. The piston 42 is connected to a rod 40 which constitutes the aforesaid first end of the cylinder 34 articulated to the pin 32, and which incorporates percussion means preferably consisting of a cylindrical beating body 50 slidably mounted in an elongated chamber 46 formed coaxially in the rod 40. The beating body 50 is driven according to a to-and fro motion by a hydraulic or pneumatic control device of a type known per se, which is commonly used in demolishing hammers.
Preferably, each jaw 24 is provided with teeth shaped projecting formations 25, to make easier crushing of the member C, and/or shear blade shaped formations 27, in order to allow that possible reinforcing rods within the element C are cut.
Although a crushing apparatus provided with a pair of jaws 24 has been previously described, of course also a crushing apparatus provided with a single movable jaw 24 falls within the invention, in which case the body 12 will have a portion projecting from its end 20 and adapted to constitute a stationary jaw facing the single movable jaw 24.
The apparatus 10 of the present embodiment of the invention allows that a very effective breaking up action is carried out by virtue of the combination of the compressive action performed by each swinging jaw 24 as a result of driving the respective cylinder 34, together with the action of percussion carried out by the percussion unit associated to each cylinder 34, the combined actions of percussion and compression being mostly concentrated on each swingable jaw 24.
In particular, in the operation of the apparatus 10, during a demolition work a member C to be demolished is grasped between the jaws 24 by controlling the extension of the cylinders 34 and, simultaneously or selectively, the respective percussion units are driven in order to make easier the compressive action of the jaws 24 as well as the penetration of the teeth 25 thereof into the member Cr in order to make therefore more effective and faster the demolition work.
According to an other embodiment of the invention shown in
In this case, the percussion means are directly associated with the main body 12, in a manner independent of the jaws 24, and consist of at least a demolishing unit 52, of the type per se known which usually outfits demolishing hammers, and which includes therefore an elongated chamber in which a beating body is slidably mounted, which is adapted to be driven according to a to-and-fro motion as a result of driving a hydraulic or pneumatic control device. A tool 54, for example a bit shaped tool, is associated with such a beating body, which is arranged so as to project from the distal portion 20 of the body 12, preferably in a middle position between the jaws 24.
Also in this case, in spite of the fact that an apparatus provided with a pair of movable jaws 24 has been described, the invention comprises also a crushing apparatus having a single movable jaw 24 and another stationary jaw facing it, which extends from the end 20 of the body 12.
The apparatus according to this embodiment allows that a member C, grasped between the jaws 24, is broken up owing to the extension of the cylinders 35, both as a result of the compressive action performed by the jaws 24, and of the action of percussion carried out by the tool 54 owing to the activation of the percussion unit 52. In particular, during the demolition work, the action of the tool 54 is made easier since the member C, which is firmly grasped by the jaws 24, can be held in a fixed position, and therefore the action of percussion of the tool 54 can be better concentrated at a preselected zone thereof. Also in this case, both the compressive action of the jaws 24 and the action of percussion of the tool 54, which can be carried out selectively or simultaneously, allow that the breaking up action of a member C to be demolished is made more effective and faster.
| Number | Date | Country | Kind |
|---|---|---|---|
| TO2008A000074 | Jan 2008 | IT | national |
