Apparatus for manipulating tubular and round section objects

Abstract

The invention relates to an apparatus (1) for manipulating, such as machining and especially cutting, tubular and round- bar type workpieces, which apparatus comprises at least one cutting blade (3) rotatable around the workpiece and a motor (5) for rotating the at least one cutting blade around the workpiece, wherein the at least one cutting blade (3) is connected to a circular guide (2), which circular guide is openable for insertion of the workpiece inside the guide and closable for the manipulation process of the workpiece.

Description

[0001] APPARATUS FOR MANIPULATING TUBULAR AND ROUND SECTION

[0002] OBJECTS

[0003] Technical field

[0004] The invention relates to an apparatus for manipulating, such as machining and especially cutting tubular and round-bar type objects, such as pipes.

[0005] Background

[0006] Different types of tools are known from the prior art for machining, such as cutting, a tubular or round-bar type pieces. Typically, especially in devices for larger diameter tubular pieces, the tubular piece to be machined is rotated in relation to the tool for implementing the machining. This raises the problem that these types of devices are quite difficult to use for tubular pieces fixed in other constructions, such as buildings, for example, which cannot be rotated in relation to the machining device.

[0007] Known are also machining and cutting devices for smaller diameter tubular pieces, wherein the tubular piece is pushed and hold inside a substantially C- shaped piece, which piece is equipped with cutting blade, and which piece is rotated around the tubular piece and in relation to the rest of the device for cutting the tubular piece. This type of devices, however, are typically restricted to smaller diameter tubular pieces and pipes, and the adjustment possibilities for adjusting the device for different diameter tubular objects is quire restricted due to the construction of the device.

[0008] Summary

[0009] An object of the present invention is to provide apparatus for manipulating tubular and round section objects so as to solve or at least alleviate the prior art disadvantages.

[0010] The objects of the invention are achieved by apparatus which is characterized by what is stated in the independent claim 1 .

[0011] The preferred embodiments of the invention are disclosed in the dependent claims.

[0012] The present invention provides an apparatus for manipulating tubular and round-bar objects, which comprises at least one cutting blade rotatable around a tubular object, such as a pipe, and connected to a closed circular guide, which guide can be opened for insertion of the tubular object inside the guide and closed for the manipulation process. This way the device and the tubular object to be manipulated can remain stationary, while the cutting blade is rotated around the tubular object for the manipulation process.

[0013] The cutting blade which is arranged to move around the tubular object to be manipulated enables cutting with the apparatus fixedly assembled tubular objects.

[0014] In the context of this application, the tubular object to be manipulated is also called a workpiece.

[0015] The apparatus of the invention for manipulating, such as machining and especially cutting, tubular and round-bar type workpieces, comprises at least one cutting blade rotatable around the workpiece and a motor for rotating the at least one cutting blade around the workpiece, wherein the at least one cutting blade is connected to a circular guide, which circular guide is openable for insertion of the workpiece inside the guide and closable for the manipulation process of the workpiece.

[0016] In other words, the at least one cutting blade is arranged to move around the workpiece to be manipulated.

[0017] In other words, the apparatus is arranged to cut a stationary workpiece.

[0018] In an embodiment of the apparatus of the invention the at least one cutting blade is fixedly connected to the circular guide and the guide rotated for rotating the cutting blade around the workpiece, or the at least one cutting blade is movably mounted on the circular guide for rotating the cutting blade around the workpiece.

[0019] In an embodiment of the apparatus of the invention the circular guide comprises at least two sections, wherein one of the sections is connected from one end to the apparatus via a hinge, and comprises a locking device in the opposite end of the section to lock the opposite end to the apparatus.

[0020] In an embodiment of the apparatus of the invention the apparatus comprises at least two support rollers, and wherein the distance of the support rollers and the cutting blade from the circular guide is adjustable. This adjustability of distance is preferably obtained with elongate connecting pieces, which connecting pieces are connected turnably from one end to the circular guide and to the other end of the connecting piece is attached rotatably the support roller or the cutting piece. Alternatively, instead of at least two support rollers, the apparatus may comprise at least two cutting blades.

[0021] In an embodiment of the apparatus of the invention the motor is an electric motor and the apparatus comprises related power transmission for moving the at least one cutting blade. In this embodiment the apparatus preferably comprises also a battery for providing electrical energy for the electric motor, but also a power cord connected to a power grid may be used for providing required electrical energy for the electric motor.

[0022] In an embodiment of the apparatus of the invention is a handheld tool.

[0023] More precisely the features defining an apparatus in accordance with the present invention are presented in claim 1. Dependent claims present advantageous features and embodiments of the invention.

[0024] An advantage of the invention is that it enables cutting fixedly assembled tubular objects.

[0025] Furthermore, the tubular objects are firmly supported during manipulation which enables cutting tubular objects made of hard material.

[0026] Furthermore, the invention enables cutting tubular objects without sparking. Furthermore, the invention enables safe cutting tubular objects.

[0027] Brief description of the drawings

[0028] Exemplifying embodiment of the invention and its advantages are explained in greater detail below in the sense of example and with reference to accompanying drawings, where

[0029] Figures 1A and 1 B show schematically a side view of an embodiment of the apparatus of the invention with and without outer cover in use mode,

[0030] Figures 2A and 2B show schematically a side view of the embodiment of figures 1A and 1 B with and without outer cover in open mode,

[0031] Figures 3A and 3B show schematically a top view of the embodiment of figures 1A and 1 B with and without outer cover in use mode, and Figures 4A and 4B show schematically the adjustment of the embodiment of figures 1A and 1 B for different diameter tubular pieces.

[0032] Figure 5 shows schematically another embodiment of the adjustment of the embodiment of figures 1A and 1 B for different diameter tubular pieces.

[0033] Figure 6 shows schematically a 3D view an embodiment of the apparatus in use mode.

[0034] Figure 7 shows schematically a side view an embodiment of power transition in use mode.

[0035] Figure 8 shows schematically a side view of an embodiment of a blade moving arrangement of the present invention,

[0036] Figure 9 shows schematically a side view of another embodiment of a blade moving arrangement of the present invention,

[0037] Detailed description of the exemplifying embodiment

[0038] The embodiment of the present invention of an apparatus 1 for manipulating, such as machining and especially cutting, tubular and round-bar type workpieces shown in the figures is a handheld tool, and comprises a circular guide 2, and a cutting blade 3 and two support rollers 4a and 4b connected to the guide.

[0039] In this embodiment the cutting blade 3 and the support rollers 4a and 4b are connected to the circular guide in such a way that when the circular guide is rotated around workpiece (not shown) located inside the open center area of the circular area, the cutting blade and the support rollers move with the circular guide and rotate around the workpiece.

[0040] In some embodiments, the circular guide 2 is rotated with an electric motor 5, which is connected to the outer surface of the circular guide with a suitable power transmission 6, which may utilize suitable gears and chains, for example.

[0041] The circular guide 2 is formed of a two sections 2a and 2b, from which one of the sections 2b is connected from one end to the other section 2a via hinge 7. This allows the circular guide 2 to be opened and closed when workpiece is inserted inside the circular guide. The opened position of the circular guide 2 and its sections 2a and 2b is shown in figures 2A and 2B.

[0042] The circular guide 2 is formed of a two sections 2a and 2b. The circular guide 2 is formed of an openable section 2b and a fixed section 2a as can be seen figures 1 B and 2B.

[0043] A locking device comprising two hook-like parts 8a and 8b is used to lock the sections 2a and 2b of the circular guide to closed position. These hook-like parts 8a and 8b are better shown in figures 4A and 4B.

[0044] When the apparatus 1 is used, the circular guide 2 is opened by pressing the hook-like part 8a at the position shown with an arrow in figure 4A, which releases the locking of the section 2b to 2a, after which the section 2b can be manually turned to the open position. Then a tubular workpiece is inserted inside the circular guide 2, or the apparatus is moved so that a tubular workpiece is located inside the circular guide 2, and the section 2b is manually closed. By turning of the section 2b in closed position also locks the section in closed position, which locking is achieved with the interaction of the hook-like parts 8a and 8b of the locking device.

[0045] After the circular guide 2 is closed, the support rollers 4a, 4b and the cutting blade 3 are moved against outer surface of the workpiece by rotating an adjustment rod 9 with a knob 10. When the support rollers 4a, 4b and the cutting blade 3 are tightly against the outer surface of the workpiece, the end of the adjustment rod 9 is moved from its seat 11 by pulling the knob 10 in the longitudinal direction of the adjustment rod. The cutting blade 3 is connected to the circular guide 2 with suitable spring-loaded arrangement in order to force the cutting blade to cut to the workpiece during the cutting process, which spring-loaded arrangement is also adjusted during this stage.

[0046] In some embodiments, the manipulating process is started by activating the electric motor 5 with the activation button 12. This causes the circular guide 2, together with the support rollers 4a, 4b and the cutting blade 3, to rotate around the workpiece, while rest of the apparatus 1 remains stationary. During the rotating the cutting blade 3 is forced to cut into the workpiece with suitable spring-loading. After the workpiece inside the circular guide 3 is cut, the circular guide is rotated to its start-up position and stopped there, with help of a suitable limit switch for example, in which start-up position the adjustment rod 9 can be pushed in the seat 11 . The support rollers 4a, 4b and the cutting blade 3 are moved away from the workpiece by rotating the adjustment rod 9 with the knob 10, the section 2b of the circular guide 2 is opened, and the apparatus 1 is moved away from the workpiece. Alternatively, is the workpiece is cut and the part cut away from the workpiece allows the apparatus 1 to be moved away from the workpiece without opening the circular guide, the apparatus 1 can just be moved away from the workpiece without the opening procedure.

[0047] One embodiment of the adjustment arrangement 400 is shown in figures 4A and 4B. The adjustment arrangement 400 is arranged to support the workpiece to be manipulated in use mode,

[0048] The above discussed adjustment of the support rollers 4a, 4b and the cutting blade 3 by rotating the adjustment rod is illustrated in figures 4A and 4B. In this embodiment rotating of the part containing the seat 11 causes adjustment parts 12a and 12b to move in relation to the sections 2a and 2b of the circular guide 2. The adjustment parts 12a and 12b are formed so, that their movement in relation to the circular guide 2 and to the support rollers 4a, 4b and the cutting blade 3, causes a connecting part 13 of the cutting blade and connecting parts 14a and 14b of the support rollers to turn in relation to the circular guide, which turning moves the cutting blade and the support rollers towards and away the center area of the circular guide.

[0049] The position of the support rollers 4a, 4b and the cutting blade 3 shown in figure 4A defines maximum diameter for the workpiece for the apparatus 1 , and the position of the support rollers 4a, 4b and the cutting blade 3 shown in figure 4b defines the minimum diameter for the workpiece for the apparatus.

[0050] One embodiment of the adjustment arrangement 400 is show in figure 5. The adjustment arrangement 400 is arranged to support the workpiece to be manipulated in use mode.

[0051] In some embodiments, the apparatus comprises 1 a cutting blade support 30, the at least one cutting blade 3 is supported to the cutting blade support 30, and the motor is arranged to rotate the cutting blade support 30 relation to the circular guide.

[0052] In other words, the at least one cutting blade 3 is mounted to the cutting blade support 30.

[0053] In other words, the at least one cutting blade 3 is connected to the cutting blade support 30.

[0054] In some embodiments, the apparatus 1 comprises a blade moving arrangement 300, the at least one cutting blade 3 is rotatably supported to a blade moving arrangement 300, and the blade moving arrangement 300 is mounted to the cutting blade support 30.

[0055] In other words, the apparatus 1 comprises a blade moving arrangement 300, the at least one cutting blade 3 is rotatably mounted to a blade moving arrangement 300, and the blade moving arrangement 300 is movable mounted to the cutting blade support 30.

[0056] In other words, the blade moving arrangement 300 is arranged to move in the use mode the cutting blade 3 towards the central axis C of the workpiece to be cut.

[0057] In some embodiments, cutting blade support 30 comprises a cutting blade support opening 32, the apparatus 1 is arranged to receive the workpiece 1000 to be cut via the cutting blade support opening 32.

[0058] In other words, the adjustment arrangement 400 is arranged to support the workpiece 1000 to be cut.

[0059] The adjustment arrangement 400 is arranged to support workpieces which have various diameters.

[0060] In some embodiments, the adjustment arrangement 400 comprises three or more support part 401 .

[0061] Three support points lock a position of the workpiece in relation to the apparatus 1 .

[0062] In some embodiments, the adjustment arrangement 400 comprises 3 - 10 support part 401.

[0063] Additional support parts provide firmer support.

[0064] In some embodiments, the adjustment arrangement 400 comprises 6-8 support part 401 .

[0065] 6-8 support part provide a firm support so that the range of diameters of workpieces to be cut with the apparatus 1 is still large.

[0066] The support part 401 having a first end 4011 of the support part 401 and a second end 4012 of the support part 401 . The support part 401 comprises support part teeth 4013 provided in the vicinity of the second end 4012 of the support part 401 .

[0067] The support part teeth 4013 are arranged to protrude from the support part 401 towards the adjusting ring 404-

[0068] The adjustment arrangement 400 comprises an adjusting ring 404, The adjusting ring 404 is provided with one or more adjusting ring teeth 4041 .

[0069] The one or more adjusting ring teeth 4041 are arranged protrude from the adjusting ring 404 towards the support part 401 .

[0070] The adjusting ring 404 is arranged to be rotated in relation to the circular guide 2.

[0071] In other words, the adjusting ring 404 is arranged to be rotated around central axis or the workpiece.

[0072] The adjustment arrangement 400 comprises an adjustment axis 402. The support part 401 is arranged to rotate around the adjustment axis 402. The adjustment axis 402 is provided in the vicinity of the second end 4012 of the support part 401 .

[0073] The adjusting ring 404 is arranged to rotate the support part 401 around the adjustment axis 402.

[0074] In other words, the adjusting ring 404 is arranged to rotate the support part 401 around the adjustment axis 402, and the first end 4011 of the support part 401 is arranged to move in relation to the workpiece.

[0075] In other words, the first end 4011 of the support part 401 is arranged to move in relation to a central axis C of the workpiece to be cut.

[0076] In the context of this application, a central axis C means an imaginary straight line going through the centre of cross-section of an object. The central axis is shown in figure 6.

[0077] The adjustment arrangement 400 comprises an adjusting bar 403. The adjusting bar 403 is arranged to rotate the adjusting ring 404 in the use mode,

[0078] The one or more support part teeth 4013 are compatible with the one or more adjusting ring teeth 4041 , and one or more the support part teeth 4013 are arranged to extend between one or more adjusting ring teeth 4041 .

[0079] In other words, least part of the one or more support part teeth 4013 are arranged to extend between the one or more adjusting ring teeth 4041 .

[0080] The support part 401 is arranged to support the workpiece with the first end 4011 of the support part 401 or the workpiece is arranged to be supported with the support part 401 the in vicinity of the first end 4011 of the support part 401. The adjusting ring 404 comprises a first adjusting ring part 4045 and a second adjusting ring part 4046.

[0081] The second adjusting ring part 4046 is arranged to be moved together with openable section 2b to the open mode.

[0082] Figure 6 shows the apparatus in use mode. The support parts 401 of the adjustment arrangement 400 are arranged to support the workpiece 1000 to be manipulated,

[0083] In other words, in use mode the support parts 401 are moved with the adjusting ring 404 in contact with the workpiece 1000 to be cut.

[0084] It should be noted that embodiments shown in figures 5 and 6 may be incorporated with embodiments disclosed in figures 1A, 1 B, 2A, 2B, 3A, 3B, 4A and 4B.

[0085] Figure 7 shows schematically a side view an embodiment of power transition in use mode. It should be noted that embodiments shown in figure 7 may be incorporated with embodiments disclosed in figures 1A, 1 B, 2A, 2B, 3A, 3B, 4A, 4B, 5 and 6.

[0086] Figure 7 shows an embodiment, where in the apparatus 1 comprises a power transmission 6, the power transmission is arranged to transfer rotational movement from the electric motor 5 to the cutting blade support 30.

[0087] In some embodiments, the at least one cutting blade 3 is movably mounted to the circular guide 2 with a cutting blade support 30, the motor is arranged to rotate the cutting blade support 30.

[0088] In some embodiments, the at least one cutting blade 3 comprises one cutting blade 3.

[0089] In some embodiments, the circular guide 2 is arranged to surround the cutting blade support 30 and the cutting blade support 30 is rotatably supported to the circular guide 2.

[0090] In some embodiments, the cutting blade support 30 is supported to the circular guide 2 with the support rollers 4a, 4b and 4c.

[0091] In some embodiments, the electric motor 5 is arranged to rotate the cutting blade support 30 so that the cutting blade support 30 is provided in the circular guide 2 and the cutting blade support 30 is rotatably supported to the circular guide 2. In other words, the cutting blade support 30 is arranged to be rotated in relation to the circular guide 2 so that the circular guide 2 covers the cutting blade support 30.

[0092] In some embodiments, the circular guide 2 is arranged to surround entirely the cutting blade support 30 in the use mode, and in the open mode at least a part the cutting blade support opening 32 is arranged to be uncovered.

[0093] In other words, in the open mode the fixed section 2a.of the circular guide 2 is not covering the blade support opening 32.

[0094] In other words, the apparatus 1 is arranged to receive the workpiece 1000 to be cut via opened the openable section 2b of the circular guide 2, and via the blade support opening 32

[0095] In some embodiments, the cutting blade support 30 having a C-shape. In other words, the cutting blade support 30 comprises a segment of a gear wheel, the cutting blade support 30 comprises a cutting blade support opening 32 so that the cutting blade support 30 is arranged to surround a part of the workpiece 1000 to be cut.

[0096] In some embodiments, the power transmission 6 comprises a first gear wheel 61 and a second gear wheel 62, the first gear wheel 61 and the second gear wheel 62 are arranged to rotate the cutting blade support 30, the first gear wheel 61 is arranged to have a contact with the cutting blade support 30 at a first contact point 611 , the second gear wheel 62 is arranged to have a contact with the cutting blade support 30 at a second contact point 621 , a distance between the second contact point 621 and the first contact point 611 is a first distance L1 , the cutting blade support opening 32 having a first width W1 , and the first distance L1 is greater than the first width W1 .

[0097] In preferred embodiments, the first distance L1 is 1 ,05 - 1 , 35 times the first width W1 .

[0098] That enables positioning the workpiece 1000 to be cut via the cutting blade support opening 32 so that the cutting blade support 30 partially surrounds the workpiece to be cut 1000, the cutting blade support 30 is rotatable around the workpiece to be cut 1000, and in every position of the cutting blade support 30 at least another of the first gear wheel 61 and the second gear wheel 62 is arranged to rotate the cutting blade support 30.

[0099] In other words, the cutting blade support 30. having the following positions: a tooth of the first gear wheel 61 is between teeth of the cutting blade support 30, a tooth of the second gear wheel 62 is between teeth of the cutting blade support 30, and a tooth of the second gear wheel 62 and a tooth of the first gear wheel 61 are between teeth of the cutting blade support 30.

[0100] It should be noted that the first contact point 611 means a point wherein a tooth of the first gear wheel 61 is arranged to be positioned between teeth of the cutting blade support 30.

[0101] It should be noted that the second contact point 611 means a point wherein a tooth of the second gear wheel 62 is arranged to be positioned between teeth of the cutting blade support 30.

[0102] In some embodiments, the apparatus 1 comprises a power transmission 6, the power transmission 6 comprises a motor gear wheel 63, the motor gear wheel 63 is connected to the motor 5, the motor gear wheel 63 arranged to receive rotational movement from the motor 5, the power transmission 6 comprises a first train of gear wheels 612, the first train of gear wheels 612 extending between the motor gear wheel 63 and the cutting blade support 30, the power transmission 6 comprises a second train of gear wheels 622, the second train of gear wheels 622 extending between the motor gear wheel 63 and the cutting blade support 30, and both the first train of gear wheels 612 and the second train of gear wheels 622 comprises even number of gear wheels or both the first train of gear wheels 612 and the second train of gear wheels 622 comprises uneven number of gear wheels.

[0103] In some embodiments, the apparatus 1 comprises a power transmission 6, the power transmission 6 comprises a motor gear wheel 63, the motor gear wheel 63 is connected to the motor 5, the motor gear wheel 63 arranged to receive rotational movement from the motor 5, the motor gear wheel 63 is arranged to rotate the cutting blade support 30, the power transmission 6 comprises a first train of gear wheels 612, the first train of gear wheels 612 extending between the motor gear wheel 63 and the cutting blade support 30.

[0104] In some embodiments, the apparatus 1 comprises a power transmission 6, the power transmission 6 comprises a motor gear wheel 63, the motor gear wheel 63 is connected to the motor 5, the motor gear wheel 63 arranged to receive rotational movement from the motor 5, the motor gear wheel 63 is arranged to rotate the cutting blade support 30, the power transmission 6 comprises a first train of gear wheels 612, the first train of gear wheels 612 extending between the motor gear wheel 63 and the cutting blade support 30, and the first train of gear wheels 612 comprises even number of gear wheels.

[0105] In some embodiments, the first train of gear wheels 612 comprises 2 - 5 gear wheels. It should be noted that the first train of gear wheels 612 comprises the first gear wheel 61 , the first gear wheel 61 is arranged to rotate the cutting blade support 30.

[0106] It should be noted that the second train of gear wheels 622 comprises the second gear wheel 62, the second gear wheel 62 is arranged to rotate the cutting blade support 30.

[0107] That enables providing the cutting blade support opening 32 having a first width W1 , and the first distance L1 is greater than the first width W1 so that the structure is still simple. In other words that enables rotating the cutting blade support 30 with the first gear wheel 61 and the second gear wheel 62 a full round even the cutting blade support 30 comprises the cutting blade support opening 32.

[0108] In some embodiments, the second train of gear wheels 622 comprises 2 - 5 gear wheels.

[0109] That enables providing the cutting blade support opening 32 having a first width W1 , and the first distance L1 is greater than the first width W1 so that the structure is still simple.

[0110] A gearwheel is a rotating machine part used to transmit rotational motion and / or torque by means of a series of teeth that engage with compatible teeth of another gearwheel or other part. The teeth can be integral saliences or cavities machined on the part, or separate pegs inserted into it. In the latter case, the gear may be also called a cogwheel. Two or more meshing gearwheels may be called a gear train or train of gear wheels.

[0111] Figure 8 shows schematically a side view of an embodiment of a blade moving arrangement of the present invention, it should be noted that embodiments shown in figure 7 may be incorporated with embodiments disclosed in figures 1 A, 1 B, 2A, 2B, 3A, 3B, 4A, 4B, 5, 6 and 7.

[0112] In some embodiments, the apparatus 1 comprises a blade moving arrangement, the blade moving arrangement is arranged to move in the use mode the cutting blade 3 towards the workpiece 1000 be cut.

[0113] In preferred embodiments, the blade moving arrangement is arranged to move in the open mode the cutting blade 3 towards the circular guide 2. The blade moving arrangement increasing thickness of the material to be cut. In some embodiments, the apparatus 1 is arranged to cut workpieces having a thickness of a wall in the range from 0,5 mm to 5 mm.

[0114] In some embodiments, the apparatus 1 comprises a blade moving arrangement 300, the blade moving arrangement 300 is arranged to move the cutting blade 2 towards the workpiece 1000 to be cut in each round of the cutting blade 3.

[0115] In other words, the blade moving arrangement 300 is arranged to move the cutting blade 3 towards the workpiece 1000 to be cut when the cutting blade is rotated on full round.

[0116] In some embodiments, the apparatus 1 comprises a cutting blade support 30, the at least one cutting blade 3 is mounted to the cutting blade support 30, and the motor is arranged to rotate the cutting blade support 30.

[0117] In some embodiments, the apparatus 1 comprises a blade moving arrangement 300, the at least one cutting blade 3 is rotatably supported to a blade moving arrangement 300, and the blade moving arrangement 300 is mounted to the cutting blade support 30,

[0118] In some embodiments, the apparatus 1 comprises a cutting blade axis 31 , and the cutting blade 3 is rotatably connected to the blade moving arrangement 300 with the cutting blade axis 31 .

[0119] In some embodiments, the apparatus 1 comprises a cutting blade axis 31 , and the cutting blade 3 is rotatably connected to the cutting blade support 30 with the cutting blade axis 31 .

[0120] In some embodiments, the blade moving arrangement 300 comprises a blade moving support 301 . The blade moving support 301 having a first end 311 . the blade moving support 301 comprises a rotatable support 302 at first end 311 . The rotatable support 302 is rotatably supported to the cutting blade support 30.

[0121] In some embodiments, the blade moving support 301 is arranged to have a C- shape form.

[0122] In some embodiments, the blade moving support 301 having a second end 312.The second end 312 is arranged to be moved. The cutting blade 3 is rotatably connected the blade moving support 301 between the first end 311 and the second end 312.

[0123] The rotatable support 302 is rotatably supported to the cutting blade support 30. In some embodiments, the blade moving arrangement 300 comprises a moving arrangement groove 303 provided to the cutting blade support 30. The blade moving arrangement 300 further comprises a moving part 307 arranged to move along the moving arrangement groove 303. The moving part 307 is arranged to move the cutting blade 3 towards the working part 1000 to cut during cutting process.

[0124] In some embodiments, the moving part 307 is arranged to be in contact with the blade moving support 301 at the second end 312 or in the vicinity of the second end 312.

[0125] In some embodiments, the blade moving arrangement 300 comprises a moving arm 305 and a moving spring 306. The moving spring 306 is arranged to move the moving part 307 with the moving arm 305.

[0126] In some embodiments, the moving spring 306 is arranged to return in the open mode the cutting blade 3 to a starting position

[0127] In the starting position the cutting blade 3 is moved towards the fixed section 2a of the circular guide 2.

[0128] Figure 9 shows schematically a side view of another embodiment of a blade moving arrangement of the present invention, it should be noted that embodiments shown in figure 7 may be incorporated with embodiments disclosed in figures 1A, 1 B, 2A, 2B, 3A, 3B, 4A, 4B, 5, 6 and 7.

[0129] In this embodiment, the blade moving arrangement 300 comprises a rotatable part 320 arranged to be rotated in each round of the blade 3. The rotatable part 320 is arranged to move the cutting blade 3 towards the workpiece 1000 to be cut. The blade moving arrangement 300 comprising a spring part 322. The spring part 322 is arranged to prevent the movement of the cutting blade 3 when the cutting blade 3 is in contact with the workpiece 1000 to be cut.

[0130] The rotatable part 320 having helical teeth 321 provided to one end of the rotatable part 320, The spring part 322 is arranged to rotate rotatable when the cutting blade 3 is not in contact with the workpiece 1000 to be cut.

[0131] In some embodiments, the apparatus 1 comprises a blade moving arrangement 300, the blade moving arrangement 300 is arranged to move the cutting blade 2 towards the workpiece 1000 to be cut in each round of the cutting blade 3. In other words, the blade moving arrangement 300 is arranged to move the cutting blade 3 towards the workpiece 1000 to be cut when the cutting blade is rotated on full round.

[0132] The maximum and minimum diameters of the workpieces that can be manipulated with the apparatus 1 are typically between 32-120 mm, preferably between 70-116 mm. However, apparatuses for larger, or smaller, diameter workpieces can also be designed is accordance with the present invention.

[0133] In some embodiments, the apparatus 1 is arranged to cut workpieces 1000 having a dimeter in the range 50 mm - 120 mm.

[0134] In some embodiments, the apparatus 1 is arranged to cut workpieces 1000 having a dimeter in the range 70 mm - 220 mm.

[0135] In some embodiments, apparatus 1 is arranged to cut any one or combination of the following: steel, stainless steel, iron and copper.

[0136] As can be seen from figure 3B, the circular guide 2 and it sections 2a, 2b are preferably formed of two plate-like parts, between which parts the support rollers 4a and 4b are connected via the connecting parts 14a and 14b, the cutting blade 3 via the connecting part 13. Between the plate-like parts of the circular guide 2 and its sections 2a, 2b are also arranged the adjustment parts 12a and 12b and the part containing the seat 11 .

[0137] Operating power for the electric motor 5 of the apparatus 1 is preferably provided with a suitable battery (not shown), which battery is a part of the apparatus. Alternatively, the operating power for the electric motor 5 can be provided with a power cord connected to a power grid, for example.

[0138] The specific exemplifying embodiment of the invention shown in the figure and discussed above should not be construed as limiting. A person skilled in the art can amend and modify the embodiment described in many evident ways within the scope of the attached claims. Thus, the invention is not limited merely to the embodiment described above.

Claims

Claims:

1. An apparatus (1 ) for manipulating, such as machining and especially cutting, tubular and round-bar type workpieces, said apparatus comprising at least one cutting blade (3) rotatable around the workpiece and a motor (5) for rotating the at least one cutting blade around the workpiece, characterized in that the at least one cutting blade (3) is connected to a circular guide (2), which circular guide is openable for insertion of the workpiece inside the guide and closable for the manipulation process of the workpiece.

2. An apparatus (1 ) of claim 1 , wherein the at least one cutting blade (3) is fixedly connected to the circular guide (2) and the guide rotated for rotating the cutting blade around the workpiece, or the at least one cutting blade (3) is movably mounted on the circular guide (2) for rotating the cutting blade around the workpiece.

3. An apparatus (1 ) of claim 1 or 2, wherein the apparatus comprises (1 ) a cutting blade support (30), the at least one cutting blade (3) is supported to the cutting blade support (30), and the motor (5) is arranged to rotate the cutting blade support (30) in relation to the circular guide (2).

4. An apparatus (1 ) of any of claims 1 -3, wherein the apparatus (1 ) comprises a blade moving arrangement (300), the blade moving arrangement (300) is arranged to move in the use mode the cutting blade (3) towards the workpiece (1000) to be cut.

5. An apparatus (1 ) of any of claims 1 -4, wherein the apparatus (1 ) comprises a blade moving arrangement (300), the at least one cutting blade (3) is rotatably supported to a blade moving arrangement (300), and the blade moving arrangement (300) is mounted to the cutting blade support (30).

6. An apparatus (1 ) of any of claims 1 -5, wherein the cutting blade support (30) comprises a cutting blade support opening (32), the apparatus (1 ) is arranged to receive the workpiece (1000) to be cut via the cutting blade support opening (32).

7. An apparatus (1 ) of any of claims 1 -6, wherein the apparatus (1 ) comprises a blade moving arrangement (300), the blade moving arrangement (300) isarranged to move the cutting blade (2) towards the workpiece (1000) to be cut in each round of the cutting blade (3).

8. An apparatus (1 ) of any of claims 1 -7 , wherein the circular guide (2) comprises at least two sections (2a, 2b), wherein one of the sections (2b) is connected from one end to the apparatus (1 ) via hinge (7), and comprises a locking device (8a) in the opposite end of the section to lock the opposite end to the apparatus (1 ).

9. An apparatus (1 ) of any of claims 1 -8, wherein the apparatus (1 ) comprises at least two support rollers (4a, 4b), and wherein the distance of the support rollers and the cutting blade (3) from the circular guide (2) is adjustable.

10. An apparatus (1 ) of any of claims 1 -9, wherein the motor is an electric motor (5) and the apparatus comprises related power transmission (6) for moving the at least one cutting blade (3).

11. An apparatus (1 ) of claim 10, wherein the apparatus (1 ) comprises a battery for providing electrical energy for the electric motor (5).

12. An apparatus (1 ) of any of claims 1-11 , wherein the apparatus (1 ) is a handheld tool.

13. An apparatus (1 ) of any of claims 3-12, wherein the apparatus (1 ) comprises a power transmission (6), the power transmission is arranged to transfer rotational movement from the motor (5) to the cutting blade support (30).

14. An apparatus (1 ) of any of claims 3-13, wherein the apparatus (1 ) comprises a power transmission (6), the power transmission (6) comprises a first gear wheel (61 ) and a second gear wheel (62), the first gear wheel (61 ) and the second gear wheel (62) are arranged to rotate the cutting blade support (30), the first gear wheel (61 ) is arranged to have a contact with the cutting blade support (30) at a first contact point (611 ), the second gear wheel (62) is arranged to have a contact with the cutting blade support (30) at a second contact point (621 ), a distance between the second contact point (621 )and the first contact point (61 1 ) is a first distance (L1 ), the cutting blade support opening (32) having a first width (W1 ), and the first distance (L1 ) is greater than the first width (W1 ).

15. An apparatus (1 ) of any of claims 3-14, wherein:- the apparatus (1 ) comprises a power transmission (6), the power transmission (6) comprises a motor gear wheel (63), the motor gear wheel (63) is connected to the motor (5), the motor gear wheel (63) arranged to receive rotational movement from the motor (5), the power transmission (6) comprises a first train of gear wheels (612), the first train of gear wheels (612) extending between the motor gear wheel (63) and the cutting blade support (30), the power transmission (6) comprises a second train of gear wheels (622), the second train of gear wheels (622) extending between the motor gear wheel (63) and the cutting blade support (30), and both the first train of gear wheels (612) and the second train of gear wheels (622) comprises even number of gear wheels or both the first train of gear wheels (612) and the second train of gear wheels (622) comprises uneven number of gear wheels; or- the apparatus (1 ) comprises a power transmission (6), the power transmission (6) comprises a motor gear wheel (63), the motor gear wheel (63) is connected to the motor (5), the motor gear wheel (63) is arranged to receive rotational movement from the motor (5), the motor gear wheel (63) is arranged to rotate the cutting blade support (30), the power transmission (6) comprises a first train of gear wheels (612), the first train of gear wheels (612) extending between the motor gear wheel (63) and the cutting blade support (30).

Images