MXPA98008952A - Man operating cutting equipment - Google Patents

Abstract

The present invention relates to manual operation device for cutting stones, concrete and similar materials, comprising a cutting element including a rotating ring-shaped support member having a circumferential indentation, and a continuous cutting tool in the form band provided with a plurality of cutting bodies and which cooperates with a indentation of the support member, means for stopping the cutting element, a device for tensioning the cutting tool, and at least one spring member for moving the device for tensioning in at least one direction

Description

MANUAL OPERATING CUTTING DEVICE Description of the Invention The invention relates to a manual operation cutting apparatus for working stone, concrete or the like, in accordance with the main concept of claim 1. By patent document EP-0 060 971 a manual operation cutting apparatus for working stone, concrete or the like is known. The cutting apparatus has a cutting device formed by an annular support body and several cutting bodies evenly distributed over the periphery of the support body. The annular support body cooperates with driving and driving elements which are disposed outside the center of rotation of the annular support body. Due to this, it is possible to obtain very large cutting depths. The acquisition costs of this known cutting device are very high, because its manufacture is carried out in several successive stages of work. In a first stage of work the annular support body is produced. The assembly of the cutting bodies on the periphery of the support body is carried out in a second work stage and, a balance of the entire cutting device occurs in a third stage of work.

When the cutting bodies of this cutting device have worn out it is necessary to change the entire cutting device. In order to be able to separate the annular support body from the cutting apparatus or from the driving wheel and the guide rollers, it is necessary to move at least one guide roller with the aid of a suitable tool in such a way that the support body can be displaced laterally with respect to the drive wheel and another guide roller and can be detached from the cutting apparatus. The assembly of a new cutting device in the cutting apparatus is carried out in a sequence inverse to that of the disassembly. When installing the previously displaced guide roller, care must be taken that there is no clogging or too much play between the guide roller and the support body. Apart from the high acquisition costs of the cutting device, also the resulting costs during disassembly and assembly have a negative effect on the economy of this known manual operation cutting apparatus. The object of the invention is to create a manually operated cutting apparatus which can be economically manufactured, has a high cutting capacity and in which the cutting bodies of the cutting device can be exchanged quickly and easily. The solution of these tasks consists of a manually operated cutting apparatus having the characteristics indicated in the distinguishing section of claim 1. The cutting bodies arranged according to the invention are, for example, configured in the form of hollow cylinder and , spaced one from the other, joined by a steel core composed of several braided cables. Distal elements are found between the cutting bodies, for example in the form of pressure springs, which are embedded, for example, in a layer of rubber (rubber). This cutting tool can be manufactured economically and therefore can be purchased at a very good price. The cutting tool can be disassembled on one side of the support body as well as the drive wheel quickly, easily and safely, or can be mounted on one side on the support body and the drive wheel respectively. In order that the cutting tool can not jump out of the concavity of the annular support body, it is convenient that the cutting tool cooperates with a tensioning device that generates a pretension. Preferably, the pretension can be produced with at least one spring element, which moves the tensioning device in at least one direction. With the aid of this spring element a substantially constant pretension is produced which, in particular, leads to a vibration-free behavior of the cutting tool when a base is worked. In order to avoid friction losses between the tensioning device and the cutting tool, the tensioning device conveniently has, rotatably accommodated, a roller with a concavity configured in a surrounding form which, like the annular support body, serves to guide the cutting tool. The cutting bodies of the cutting tool have, for example, a cylindrical contour. In order to achieve a uniform wear of the cutting bodies, the concavity of the roller conveniently extends in a plane that is arranged parallelly displaced with respect to that plane on which the concavity of the annular support body extends. The magnitude of this parallel displacement can be, for example, 0.5 to 10 mm. During the operation of the cutting apparatus these concavities arranged offset relative to each other cause a twisting of the cutting tool, so that the contour of the cutting bodies rolls in the concavities. In this way the periphery of the cutting bodies wears uniformly. In order to be able to avoid damage in particular to the concavities of the annular support body and the roller, at least between the annular support body and the cutting tool is arranged a transmission element configured in an endless manner, which avoids the direct contact of the cutting tool, in particular with the support body and with the roller. A transmission element with very high flexibility properties is preferably formed by a belt whose internal contour substantially corresponds to the contour of the two concavities and whose external contour substantially corresponds to the contour of the cutting tool. In order to be able to manufacture the cutting apparatus as small as possible and with few individual parts, the driving of the cutting tool is conveniently carried out by means of a drive wheel that cooperates at least with the annular support body. An increase in the frictional force between the drive wheel and the annular support body is conveniently achieved by proceeding so that the drive wheel cooperates with the annular support body with the interposition of the transmission element. In order to keep the size of the construction of the cutting apparatus as small as possible, the drive wheel is conveniently formed by a guide roller which is arranged adjacent to at least two additional support rollers outside the center of rotation of the cutting unit. ring support body. The invention is explained in more detail by means of drawings reproducing several exemplary embodiments. They show: Figure 1 a manually operated cutting apparatus according to the invention, seen in side elevation with the cover open; 2 shows a ion in an amplified representation along the line II-II according to FIG. 1; 3 shows a ion in amplified representation along the line III-III according to FIG. 1; 4 shows a ion in an amplified representation along the line IV-IV according to FIG. 1; 5 shows another manually operated cutting apparatus according to the invention, seen in side elevation with the cover open; 6 shows a ion in an amplified representation along the line VI-VI according to FIG. 5; 7 shows a ion in amplified representation along the line VII-VII according to FIG. 5; 8 shows a ion in an amplified representation along the line VIII-VIII according to FIG. 5. FIGS. 1 and 5 represent in each case a manually operated cutting device used to work stones, concrete or similar . The cutting apparatus has a housing 10, 110 with a handle in which there is a drive switch 12, 112 for operating the cutting apparatus. A drive device, not shown, for example in the form of an electric motor, is located inside the housing 10, 110 and can be brought into contact with an external source of electrical current by means of an electrical connection line 11, 111. On one side of the housing 10, 110 there is a cover 13, 113 which can be covered on the side remote from the housing 10, 110 by means of a closure cap (not shown). In the region of the handle, this cover 13, 113 has a connection fitting 14, 114, which can be connected to an extraction device, not shown through a hose, which is also not shown. A drive wheel 20, 120 protrudes from the cover 13, 113 and can be rotated by the drive device.

Inside the cover 13, 113 there are, in addition to the drive wheel 20, 120, an outer guide roller 40, 140, an interior guide roller 30, 130 and a tensioning device 60, 160. The cover 13, 113 is provided with an opening on the side opposite the handle. A cutting device 90, 190 formed by a supporting body 50, 150 and a cutting tool 70, 170 configured in the form of a belt as well as a worm, projects partially into the cover 13, 113 through that opening. The support body 50, 150 is rotatably and laterally rotatably supported by the drive wheel 20, 120, the internal guide roller 30, 130 and the external guide roller 40, 140. The drive wheel 20, 120 and both guide rollers 30, 40, 130, 140 are arranged outside of a center of rotation of the ring support body 50, 150 and cooperate with the support body 50, 150 at three points different The support body 50, 150 has on its periphery a concavity 51, 151 configured in a surrounding manner which serves to guide the cutting tool 70, 170. The cutting tool 70, 170 cooperates with a tensioning device 60, 160 disposed inside the cover 13, 113, which keeps the cutting tool 70, 170 under pretension. The tensioning device has, rotatably accommodated, a roller 61, 161 which is provided on its periphery with a concavity 64. This concavity 64, 164 serves to guide the cutting tool 70, 170 and, has an outline that substantially corresponds to the contour of the cutting tool 70, 170. The cutting tool 70, 170 shown in FIGS. 1, 2, 3, 5, 6, 7 is formed by a steel core 73, 173 composed of several individual braided cables, several beads in the form of cutting bodies 71, 171 cylindrical strung on the core 73, 173 of steel and, several distance elements 72, 172 located in a rubber bed, arranged between the cutting bodies 71, 171. The free ends of the steel core 73, 173 are, for example, entangled with one another, in order to obtain an endless cutting tool 70, 170. Figure 1 shows that the pretension of the cutting tool 70 is achieved with a spring element 62 that rests against the movable roller 61 and against a stop of the cover 13, which is between the roller 61 and the body 50 of ring support. The drive wheel 20 shown in FIGS. 1 and 3 cooperates with the annular support body 50 in a positive engagement, so that a rotational movement of the drive wheel 20 can be transmitted to the annular support body 50. The drive wheel 20 is fixed to a drive shaft of the drive device, not shown by means of a threaded connection. The cross section extending parallel to the central axis of the drive wheel 20 has an outer contour substantially corresponding to the concavity 51 of the annular support body 50. An outline substantially equal to that of the drive wheel 20 is provided by the outer guide roller 40 shown in FIGS. 1 and 4. This guide roller 40 is provided with a central through-hole within which there is a bearing element 41 in the form of a ball bearing, which cooperates with a pivot of an eccentric element 42. With the aid of this eccentric element 42, the external guide roller 40 can be displaced with respect to the annular support body 50 at least as much, mainly in the radial direction, that the drive wheel 20 no longer protrudes into the interior of the body concavity 51. 50 support. In this way the support body 50 can be turned with respect to the drive wheel 20 and the inner guide roller in such a way that its external contours no longer cooperate with the support body 50. The annular support body 50 has an internal contour that tapers in the direction of the center. The inner guide roller 30 is provided with a corresponding opposite contour. In the case of the manually operated cutting apparatus shown in Figure 5between the cutting tool 170 and the annular support body 150, as well as between the cutting tool 170 and the roller 161 of the tensioning device 160 is a transmission element 180 configured in an endless manner which substantially has the shape of a belt. This transmission element 180 also partially surrounds the drive wheel 120 and extends between the drive wheel 120 and the annular support body 150, as well as between the outer guide roller 140 and the annular support body 150. As can be seen from figures 6, 7 and 8, the annular support body 150 has a concavity 151 configured in a surrounding manner with a cross section. substantially trapezoidal, within which at least partially the transmission element 180 projects. The internal contour of the transmission element 180 corresponds substantially to the contour of the two concavities 151, 164 and, the external contour substantially corresponds to the contour of the cutting tool 170.

The outer guide roller 140 shown in FIG. 5, which cooperates with the annular support body 150, has a peripheral region with an external contour harmonized with the contour of the concavity 151 of the support body 150. As can be concluded from Figure 5, the tensioning device 160 cooperates with a first spring element 162 and a second spring element 163. With the force of the first spring element 162 at least the roller 161 of the tensioning device 160 moves away from the annular support body 150 in a first direction, so that the cutting tool 170 driven by the roller 161 and the body is pretensioned. 150 of ring support. With the force of the second spring element 163 the roller 161 can be displaced in a second direction, which substantially extends in a direction perpendicular to the direction of action of the first spring element 162. By moving the roller 161 in the second direction, the distance between the roller 160 and the drive wheel 120 increases more and more and the transmission element 180 is increasingly prestressed. The drive wheel 120 shown in FIGS. 6 and 7 cooperates with the annular support body 150 with the interposition of the transmission element 180 so as to be able to transmit a rotational movement of the drive wheel 120 to the drive. body 150 of annular support. The drive wheel 20 is fixed to a drive shaft of the drive device (not shown) of the cutting device by means of a threaded connection. The cross section extending parallel to the central axis of the drive wheel 120 has an external contour substantially corresponding to the contour of the concavity 151 of the annular support body 150. The external guide roller 140 shown in FIGS. 5 and 8 has an external contour substantially equal to that of the drive wheel 120. This guide roller 140 has a central through-hole within which there is a bearing element 141 in the form of a ball bearing, which cooperates with a pivot of an eccentric element 42. The support body 150 can be separated from the cutting apparatus by loosening the clamping element 143 which cooperates with eccentric element 42 by means of a suitable tool and by rotating the eccentric element 42 in the direction of the circumference. In doing so, the external guide roller 140 moves away from the annular support body 150, so that it no longer protrudes into the concavity 151 of the support body 150. In this way, the conduction of the support body 150 is canceled, so that the support body 150 can be rotated with respect to the drive wheel 120 and the inner guide roller 130, and these parts can be separated from each other. The annular support body 150 has an internal contour that narrows in the direction of the center. The inner guide roller 130 is provided with a corresponding opposite contour.

Claims (5)

1. CLAIMS 1. Manual operation cutting apparatus for working stone, concrete or the like comprising a cutting device having a rotatable annular support body and several cutting bodies cooperating with at least a part of the periphery of the supporting body , characterized in that the cutting bodies form part of a cutting tool configured in the form of a band and worm that cooperates with a concavity formed in a surrounding manner of the ring support body.
2. 2. Cutting apparatus according to claim 1, characterized in that the cutting tool cooperates with a tensioning device that generates a pre-tension.
3. 3. Cutting apparatus according to claim 2, characterized in that it is possible to move the tensioning device in at least one direction by means of a spring.
4. 4. Cutting apparatus according to claim 2 or 3, characterized in that the tensioning device has a roller rotatably housed, with a concavity configured in a surrounding manner.
5. 5. Cutting apparatus according to claim 4, characterized in that the concavity of the roller extends in a plane that is arranged parallel displaced with respect to the plane in which the concavity of the annular support body extends. Cutting apparatus according to one of claims 1 to 5, characterized in that a transmission element configured in an endless manner is arranged at least between the annular support body and the cutting tool. Cutting apparatus according to claim 6, characterized in that the transmission element is formed by a belt whose internal contour corresponds substantially to the contour of both concavities and whose external contour substantially corresponds to the contour of the cutting tool. Cutting apparatus according to one of claims 1 to 7, characterized in that the driving of the cutting tool is carried out by means of a drive wheel that cooperates at least with the annular support body. Cutting apparatus according to one of claims 6 to 8, characterized in that the drive wheel cooperates with the annular support body with the interposition of the transmission element. Cutting apparatus according to claim 8 or 9, characterized in that the drive wheel is formed by a guide roller which, together with at least two other guide rollers, is disposed outside the center of rotation of the body of the tool. ring support.