A DEVICE FOR THE MAKING OF HOLES AND/OR DEMOLITION IN CONCRETE OR THE LIKE

Abstract: A device for the making of holes or demolition in concrete comprises a machining tool (2) and a jib construction (1) carried by a carrier (6) which construction comprises an inner jib (20) and an outer jib (21). The inner jib (20) is articulatedly connected to a vertical shaft (24) and may be raised and lowered by means of a first hydraulic cylinder (29). By means of a second hydraulic cylinder (30), the outer jib (21) may be tilted in relation to the inner jib. A third hydraulic cylinder (31) may tilt an anchor plate (26) on which the machining tool (2) is detachably mounted. As a machining tool, a hewing machine may be used, the vibrations of which are transferred to the device without direct contact with any person. Furthermore, the device is easy and compact, and therefore it may be used in narrow spaces.

Description: A DEVICE FOR THE MAKING OF HOLES AND/OR DEMOLITION IN CONCRETE OR THE LIKE Background of the Invention In connection with the repair and rebuilding of existing constructions of different types, at times the need arises for the making of holes in materials difficult to machine, such as concrete, brick, calcareous sandstone and other cement-based, stone-like materials. Particularly often, holes or larger openings need to be made in joists or walls of concrete. Also, it is occasionally required that the concrete is demolished, viz . in connection with the provision of countersinks when material is removed without forming through holes. For these purposes, hewing machines are used of the type that include an iron bar which co-operates with an impact mechanism which may be driven in a pneumatic, hydraulic or electric way. Hewing machines of this type may be divided into two main categories, viz . on one hand, hand-held or manually manageable machines and, on the other hand, vehicular machines (see, e.g., US 5 490 740 and WO 88/03213). The first-mentioned machine type includes two diametrically opposed handles projecting from a house surrounding the impact mechanism, by means of which handles an operator may hold and guide the machine during operation. An advantage of such machines is that the same are relatively small and therefore may be used also in spaces having limited size, e.g. in bathrooms and the like. However, a serious disadvantage of the machine in question is that inevitable vibrations in the machine are transferred directly to the operator. This is something that is ergonomically and physiologically unjustifiable. In practice, the vibration problem entails that the operator may work with such a machine only during very short periods of time. It is true that the other category of machines, which are vehicular, have the advantage that a person does not need to be in direct contact with the machine (in doing so, the vibrations are transferred to the vehicle, which does not need to be manned) , but in this case, the vehicle in itself constitutes a problem by the fact that the same is bulky, as well as difficult to manoeuvre in narrow spaces. Therefore, the last-mentioned machine type will in practice most often be used outdoors where large manoeuvre space is available. To the extent that the machines are used indoors, the same may only be used in large rooms . Besides hewing, sawing or cutting is also occurring as a method for making openings in, above all, walls, e.g. building brick walls. For this purpose, machining tools are used in the form of circular sawing machines having diamond- equipped blades which are rotatably mounted in a motor housing in which a motor is included, preferably an electric motor for the operation of the blade. However, such tools are heavy and ungainly to handle in a manual way. This is something which frequently results in ergonomic harm for the operator, e.g. back and joint troubles. Objects and Features of the Invention The present invention aims at managing the above-mentioned problems, more precisely by providing a device which, on one hand, eliminates the need for manual retention of the machining tool during operation and, on the other hand, enables the use of the tool also in narrow spaces . Another object is to provide a device which may be held in a reliable way without human contact at the same time as the machining members of the tool should be capable of being remote-con- trolled and directed in a flexible way in the space in which the tool operates. Furthermore, the device should be structurally simple while guaranteeing a low dead weight in order to permit a flexible handling in connection with the transport of the tool between different sites of operation. The device should also be capable of being driven by means of one and the same driving source, e.g. a hydraulic motor, which is used for driving the machining tool. An additional object of the invention is to provide a device which in a universal way allows application and use of different types of machining tools, e.g. a hewing machine as well as a circular sawing machine. According to the invention, the above-mentioned objects are attained by the features defined in the single claim. Brief Description of the Appended Drawings In the drawings: Fig 1 is a side view showing the device according to the invention in a disassembled state, although in connec- tion with a supporting stand as well as a machining tool in the form of a hewing machine, Fig 2 is a schematic planar view from above of a means for turning the device laterally, Fig 3 is a side view corresponding to fig 1 showing an alternative embodiment of the invention, Fig 4 is a side view showing the device mounted on the supporting stand and co-operating with the hewing machine, the assembly in its entirety being shown installed in a room in which a driving assembly for the device is also visualised, Fig 5 is a partly cut perspective view showing the side turning means according to fig 2, and Fig 6 is a perspective exploded view showing a supporting plate included in the device and the co-operation of the plate with the hewing machine. Detailed Description of Preferred Embodiments of the Invention In fig 1, reference number 1 designates a device according to the invention illustrated in a disassembled state. The device is arranged to co-operate with a machining tool which is exemplified in the form of a bush hammer or hewing machine generally designated 2. At the end thereof opposite the tool, the device 1 may be mounted and fixed on a supporting stand, generally designated 3, of a known type per se. The supporting stand 3 includes an upright 4 having a cog railway 5 along which a vertically adjustable carrier 6 is movable. In the carrier, a cogwheel is included co-operating with the cog railway 5 and rotatable by means of a motor 7, e.g. a hydraulic motor. Furthermore, in the carrier 6, a fastener 8 is included in the form of a so called standard fastener having the purpose of receiving an anchor plate 9 appurtenant to the device 1. This anchor plate 9 may be locked in the standard fastener 8 by means of a schematically outlined locking mechanism 10, e.g. an eccentric locking mechanism. The stand 3 furthermore includes a bottom part 11 having a widespread surface as well as braces 12 to which a pair of wheels 13 is connected, by means of which the stand in an inactive state may be rolled between different sites . As may be seen in fig 4, an axially adjustable bar 14 having a screw mechanism 15 is also included in the stand, by means of which the stand may be fixed between a ceiling and a floor in a room in which the stand is installed. The hewing machine 2 is of a conventional type inasmuch as it includes an impact mechanism 17 drivable by a motor 16, e.g. a hydraulic motor, which mechanism has the purpose of setting an iron bar 18 in reciprocating, fast impact motions. An anchor plate 19 is connected to the upper part of the machine, which plate in the example extends perpendicularly to the longitudinal axis of the iron bar 18. The stand 3 as well as the hewing machine 2 as such are in all essentials previously known. The device 1 according to the invention comprises two jibs or arms 20, 21 which are interconnected via a first hinge 22. The inner stand 3 being closest to the jib 20 is via a second hinge 23 hingedly connected to an upright shaft or pin 24 which, in a suitable way, is rotatably mounted in a frame designated 25 in which also the aforementioned anchor plate 9 is included. In the embodiment shown in fig 1, the inner jib 20 is somewhat longer than the outer jib 21. However, the opposite condition is also feasible and at times preferable. Thus, in fig 3 an embodiment is shown according to which the inner jib 20 is shorter than the outer jib 21. In any case, the length of the individual jib should, however, be within the range of 500 to 1000 mm. The inner jib may, for instance, be of a length of 700 mm and the outer jib of 900 mm. The outer jib 21 is, at the free end or tip thereof, articulatedly connected to a supporting plate 26, more pre- cisely via a third hinge 27. The plate 26 forms a standard fastener for the tool 2, more precisely by the fact that the plate 26 includes means 28 (see fig 6) for receiving the anchor plate 19 of the tool. Three double-acting hydraulic cylinder mechanisms 29, 30, 31 are included in the device. Of these mechanisms or hydraulic cylinders, a first one, viz . the hydraulic cylinder 29, is connected to a fourth hinge 32 in a fastener underneath the inner jib 20, as well as to a fifth hinge which is associated with a lower part 34 (see fig 5) of the turning shaft 24. The part 34 may advantageously consist of a bracket projecting perpendicularly from the lower portion of the pin 24 in which bracket the hinge 33 is mounted. It should be evident that the hydraulic cylinder 29 servilely follows the inner jib 20 when this is turned in either direction in relation to the vertical axis of the shaft 24. The hydraulic cylinder 29 has the purpose of raising and lowering the inner jib 20. The second hydraulic cylinder 30 is connected to a sixth hinge 35 on the top side of the inner jib 20 as well as to a seventh hinge 36 on a finger-like element 37 which is stiffly united with the outer jib 21. The hydraulic cylinder 30 has the purpose of guaranteeing tilting of the outer jib 21 in relation to the inner jib. The third hydraulic cylinder 31 is connected to an eighth hinge 38 on the outer jib 21 as well as to a ninth hinge 39 which is attached on the top side of the supporting plate 26. This hinge 39 is situated at a distance from the hinge 27 between the supporting plate and the outer jib 21. By shortening and extending, respectively, the hydraulic cylinder 31, the plate 26 may be tilted to different angle positions in relation to the outer jib. From this, it follows that the angle of the iron bar 18 in relation to the same outer jib may be readjusted. This clearance angle should be within the range of 0-135°. The corresponding clearance angle between the jibs 20, 21 should be within the range of 0-180°, and the clearance angle between the inner jib 20 and the pin 24 should be within the range of 0-90° . Reference is now made to fig 5, which illustrates a means for turning of the vertical shaft or pin 24, viz . a fourth hydraulic cylinder mechanism of a double-acting type in its entirety designated 40. One end of this hydraulic cylinder 40, viz. the cylinder end is, via a tenth hinge 41, connected to an ear on a registration arm 42 projecting laterally from the anchor plate 9. The opposite end, i.e. the rod piston end, is, via an eleventh hinge 43, connected to an end of a rigid link 44, the opposite end of which is, via a twelfth hinge 45, connected to an arm 46 protruding radially from the turning shaft 24 and being rigidly connected thereto. As may be clearly seen in fig 5, the arm 46 is somewhat rotationally displaced in relation to the first hydraulic cylinder 29 as well as the inner jib 20 co-operating therewith. When the hyd- raulic cylinder 40 is extended by projection of the appurtenant rod piston, the shaft 24 turns clockwise. Conversely, the shaft 24 is turned anti-clockwise when the hydraulic cylinder is shortened. By the fact that the hydraulic cylinder is double-acting, the inner jib 20 together with the appurtenant lifting and lowering, respectively, hydraulic cylinder 29 will be distinctly held in a given, desired side turning position as soon as the rod piston is stopped in a given position of projection. In fig 6 is shown how the supporting plate 26 on the underside thereof has two cross-section-wise L-shaped rulers 28 serving as guides, in which the side edges of the anchor plate 19 may be inserted, and then vertical flanges on each plate, respectively, may be connected by means of, for instance, a nipple. In fig 4, the device 1 is shown mounted on the supporting stand 3, and the hewing machine 2 being mounted on the supporting plate 26 of the outer jib. In fig 4 is also shown how the device co-operates with a motor-driven pump unit in its entirety designated 47, by means of which the above described hydraulic cylinders may be supplied with pressure medium, particularly hydraulic oil. The pump included in the assembly 47 may advantageously be driven by an electric motor 48, and the hydraulic oil supply may be controlled by means of a remote control device 49. By means of the vertically adjustable carrier 6, the inner frame 25 of the device may be fixed in a desired point in the room, and then the hewing machine 2 may, in a flexible way, be located to desired machining positions by means of the four hydraulic cylinders 29, 30, 31 and 40 described above. Thus, by extending or shortening the hydraulic cylinder 40, the inner jib 20 may be turned laterally in relation to the upright 4 of the stand. By extension or shortening of the hydraulic cylinder 29, the outer end of the inner jib may be raised and lowered, respectively. By means of the hydraulic cylinder 30, the outer jib 21 may be tilted in order to raise and lower the hinge 27 in relation to the main hinge 22 between the jibs. By changing the length of the hydraulic cylinder 31, the supporting plate 26 may in addition be tilted in relation to the outer jib in order to readjust the angular setting of the iron bar 18 in relation to the outer jib. By means of these four readjustment possibilities, the iron bar may not only be located to a certain, required work point in the floor frame work, the tie beams or a wall, but also in a smooth way be transported while the tip of the iron bar during operation in progress has to be moved, more precisely in small, fine movements. A substantial advantage of the device according to the invention, in addition to the fact that it permits a flexible displacement of the iron bar of the machining tool with fine and exact movements, is that the device as such is easily portable and comparatively compact, whereby the device may be brought and installed also at work in narrow spaces. Although the invention above has been exemplified in connection with a hewing machine, it may also be used for other machining tool, in particular circular sawing machines for sawing. It should also be mentioned that the same may be mounted on other carriers than the type which has been illustrated in the drawings. The device may, for instance, be mounted on a simple supporting plate which is fixed, for instance, on a wall.

Claims: Claims 1. Device for the making of holes and/or demolition in concrete or the like, which device, in addition to a machining tool (2), e.g. a hewing machine, comprises, on one hand, two jibs (20, 21) inter-connected via a first hinge (22) and mutually hinged in a vertical plane, of which a first, inner jib (20) is hingedly connected to an upright shaft (24) via a second hinge (23) at an inner end of the jib, which shaft is turnably connected to a frame (25) in which a member (9) is included for detachably mounting the frame on a spatially fix- able first carrier (6), and of which a second, outer jib (21) is, at a free outer end, connected to a second carrier (26) for the machining tool (2) via a third hinge (27), and, on the other hand, three double-acting hydraulic cylinder mechanisms (29, 30, 31) , viz. a first mechanism (29) extending between a fourth hinge (32) underneath the inner jib (20) and to a fifth hinge (33) which is associated with a lower part of the turning shaft (24) and which accompanies the turning shaft during turning, the first hydraulic cylinder mechanism (29) having the purpose of guaranteeing raising and lowering of the inner jib (20); a second mechanism (30) which is connected to a sixth hinge (35) on the top side of the inner jib (20) and to a seventh hinge (36) which is associated with the outer jib (21) , the second mechanism (30) having the purpose of guaranteeing tilting of the outer jib (21) in relation to the inner jib (20); and a third mechanism (31) which is connected to an eighth hinge (38) on the top side of the outer jib (21) as well as to a ninth hinge (39) , which is applied to said second carrier (26) , more precisely in a position at a distance from the third hinge (27), the third hydraulic cylinder mechanism (31) having the purpose of guaranteeing tilting of the a second carrier (26) so as to adjust the machining tool (2) in the required angle in relation to the outer jib, said frame (25) including means (40) for mechanical turning of said turning shaft, c h a r a c t e r i z e d in that the second carrier (26) is in the form of a plate on which the machining tool (2) is detachably mountable, and that said means for turning of the shaft (24) comprises a fourth, double-acting hydraulic cylinder (40) , which, at one end, is connected to the frame (25) via a tenth hinge (41) and, at an opposite end, via an eleventh hinge (43) connected to an end of a link (44), the opposite end of which is connected to a free end of an arm (46) projecting radially from the shaft (24) via a twelfth hinge (45), and being rigidly connected to the shaft.

Inventors: OESTMAN PER, WALLIN STEFAN, OESTMAN, PER, WALLIN, STEFAN
Applicants: CASUN AB BYGG OCH INDUSTRISERV, OESTMAN PER, WALLIN STEFAN, CASUN AB BYGG OCH INDUSTRISERVICE, OESTMAN, PER, WALLIN, STEFAN
Application year: 1999
Main classification: B25D17
IPC codes: E04G23, E21B7, E21B15