Electric pipe cutter

Abstract

A motorized tube cutter includes a housing and a carriage rotatably supported by the housing. The carriage includes a cutting edge and a first axis of rotation about which the carriage is rotatable. The electric pipe cutter further comprises a brushless direct current (BLDC) motor which is used for providing torque to the bracket to enable the bracket to rotate. The motor defines a second axis of rotation parallel to the first axis of rotation.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 489,204 filed on March 9, 2023 and U.S. Provisional Patent Application No. 63 / 518,002 filed on August 7, 2023, the entire contents of which are incorporated herein by reference into this application. Technical Field

[0003] The utility model relates to a cordless power tool, and more particularly to an electric pipe cutter. Background Art

[0004] The tubing cutter is operable to perform a cutting operation on a tubular workpiece, such as a pipe or tube. An electric tubing cutter, for example, may include a motor that drives a rotating cutting assembly about the tubular workpiece during a cutting operation. Utility Model Content

[0005] The utility model provides an electric pipe cutter in one aspect, the electric pipe cutter comprises a housing, a bracket and a brushless DC (BLDC) motor, the bracket is rotatably supported by the housing and has a cutting blade and a first rotation axis, the bracket can rotate around the first rotation axis, the brushless DC motor is used to provide torque to the bracket to rotate it, the motor defines a second rotation axis, and the second rotation axis is parallel to the first rotation axis.

[0006] The utility model provides an electric pipe cutter in another aspect, the electric pipe cutter comprises a housing, a bracket and a brushless DC (BLDC) motor, the housing having a head and a handle extending from the head, the bracket being rotatably supported by the head and having a cutting blade, the brushless DC motor being used to provide torque to the bracket to rotate it, and the motor being positioned in the head of the housing.

[0007] The utility model provides an electric pipe cutter in another aspect, the electric pipe cutter comprises a housing and a first bracket, the housing having a head and a handle portion extending from the head, the first bracket being rotatably supported by the head. The first bracket comprises a first spring with an abutment member. The pipe cutter further comprises a second bracket and a cutting blade, the second bracket being rotatably supported by the head, and the cutting blade being supported by the first spring. The cutting blade comprises a shoulder. The abutment member of the first spring and the shoulder of the cutting blade are configured to hold the pipe after complete cutting.

[0008] The utility model provides an electric pipe cutter in another aspect, the electric pipe cutter comprises a housing, a bracket and a brushless DC (BLDC) motor, the housing having a head and a handle extending from the head, the bracket being rotatably supported by the head and having a cutting blade, the brushless DC motor being used to provide torque to the bracket to rotate it. The electric pipe cutter further comprises a first magnet disposed on the bracket, a sensor disposed in the head and configured to detect the first magnet, a stop rod disposed in the head, a second magnet disposed on the stop rod and a stop rod sensor disposed in the head and configured to detect the second magnet.

[0009] Other features and aspects of the present invention will become apparent by reference to the following description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is an isometric view of a pipe cutter according to a specific embodiment of the utility model.

[0011] Figure 2 yes Figure 1 Isometric view of the tube cutter with the section removed to show the motor and cutting head assembly.

[0012] Figure 3 yes Figure 1 Side view of the tube cutter with part of the tube removed to show the gear train.

[0013] Figures 4A-4D The cutting head assembly is shown in various positions during a cutting operation.

[0014] Figure 5 yes Figure 1 Side view of the tubing cutter with portions removed to show the magnets on the cutting head assembly.

[0015] Figure 6 yes Figure 1 Side view of the tube cutter with part of the tube removed to show the stop rod.

[0016] Figure 7 yes Figure 1 An end view of a pipe cutter with portions removed to illustrate abutment members on opposite sides of the cutting wheel for holding the pipe during the pipe cutting operation.

[0017] Figure 8 yes Figure 1 An isometric view of the pipe cutter with the pipe cutter section removed, showing Figure 7 abutting member.

[0018] Fig. 9 It is along Figure 8 An isometric cross-sectional view taken along section line 9-9 in FIG.

[0019] Fig.10 yes Figure 1 Isometric view of the cutting wheel, upper bracket, lower bracket, and spring of a pipe cutter.

[0020] Before any specific embodiment of the present invention is described in detail, it should be understood that the present invention is not limited to the application in the construction details and component arrangements described in the following description and shown in the drawings. The present invention can have other specific embodiments and be implemented and realized in various ways. DETAILED DESCRIPTION

[0021] Figure 1 An electric pipe cutter 100 according to one embodiment of the present invention is shown. The pipe cutter 100 is portable, handheld and configured to cut pipes or tubular workpieces (eg, metal or plastic pipes, tubes or pipes) having a nominal diameter of 3 / 8 inch to 2 inches.

[0022] The tube cutter 100 includes a housing 104 having a head 108 and a handle portion 112 extending from the head 108. The housing 104 constitutes the exterior of the cutter 100 and contains various mechanical and / or electrical components of the tube cutter 100. The housing 104 may be a hard plastic material, a metal material, and / or any other material or combination of materials suitable for containing the various components of the tube cutter 100. The head 108 includes an opening 116 for receiving a tube 120 to be cut therein. The handle portion 112 is configured to be held by a user in one or both hands.

[0023] In the illustrated embodiment, the pipe cutter 100 includes a battery pack 124 coupled to the handle portion 112. In the illustrated embodiment, the battery pack 124 is a 12 volt (12V) rechargeable power tool battery pack. The illustrated battery pack 124 may include three (3) battery cells, having, for example, lithium (Li), lithium ion (Li-ion), or other lithium-based chemistries. For example, the battery cells may have lithium cobalt (Li-Co), lithium manganese (Li-Mn) spinel, or lithium manganese nickel chemistries. In such embodiments, each battery cell may have a nominal voltage of, for example, about 3.6V, 4.0V, or 4.2V. In other embodiments, the battery cells may have nickel cadmium, nickel metal hydride, or lead acid battery chemistries. In other embodiments, the battery pack 124 may include fewer or more battery cells, and / or the battery cells may have different nominal voltages. In yet another embodiment, the battery pack 124 may be a dedicated battery (partially or entirely) disposed within the pipe cutter 100. The battery pack 124 may also be configured for use with other cordless power tools, such as drills, screwdrivers, grinders, wrenches, and saws.

[0024] Figure 2A pipe cutter 100 is shown, which includes a brushless direct current (BLDC) motor 128 located within a head portion 108 of a housing 104 and a cutting head assembly 132 rotatably supported within the head portion 108, the head portion 108 receiving torque from the motor 128 causing the cutting head assembly 132 to rotate about a first rotational axis 136. The motor 128 is also oriented within the head portion 108. The motor 128 defines a second rotational axis 140 that is parallel to the first rotational axis 136 of the cutting head assembly 132. The first and second rotational axes 136, 140 extend transversely through the head portion 108 of the housing 104. The handle portion 112 is perpendicular to the first and second rotational axes 136, 140. The pipe cutter 100 includes a user interface having a trigger switch 144 ( Figure 5 ) and a switch 148 on the head 108. When activated by the user, the trigger switch 144 activates the motor 128, causing the cutting head assembly 132 to rotate for a pipe cutting operation (i.e., a cutting mode). The switch 148 is operable to reverse the rotation direction of the motor 128 and thus the cutting head assembly 132 (i.e., a homing mode). The handle portion 112 includes a grip 152, which is configured to be compatible with a single one-handed grip type. The user grasps the grip 152 in a manner that allows the trigger switch 144 and the switch 148 to be activated by the user, as briefly described above.

[0025] Figure 3 The pipe cutter 100 is shown including a gear train 156 between the motor 128 and the cutting head assembly 132 in the head 108 of the housing 104. The gear train 156 is rotatably coupled to the motor 128 to drive the cutting head assembly 132. In other words, the gear train 156 is configured to transfer torque from the motor 128 to the cutting head assembly 132. The gear train 156 includes a drive gear 158, a first idler gear 160, a second idler gear 162, and a C-shaped head gear 164. The head gear 164 is coupled to the cutting head assembly 132 through an opening 168. The first and second idler gears 160, 162 are spaced a distance apart, which allows at least one of the first or second idler gears 160, 162 to always remain in contact with the head gear 164, even when the opening 168 of the head gear 164 rotates past the idler gears 160, 162.

[0026] The gear train 156 does not include a mechanical clutch in the head 108 of the housing 104. Instead, the tube cutter 100 includes an electronic clutch that is controlled by an electronic control unit 172 located in the head 108 of the housing 104. The electronic control unit 172 is electronically coupled to the motor 128. In other embodiments, the electronic control unit 172 is located elsewhere within the housing 104, such as the handle portion 112. The electronic control unit 172 has signals from a sensor 176 and a stop rod sensor 178 in the cutting head assembly 132. In some embodiments, the sensor 176 is a Hall effect sensor for detecting a magnet located on the cutting head housing 182. The electronic clutch will be described in further detail below.

[0027] like Figures 4A-4D As shown, the cutting head assembly 132 includes a cutting head housing 182 that supports an upper bracket 186 and a lower bracket 190. The upper bracket 186 and the lower bracket 190 define a cutting area 194 and are rotatable about the first rotation axis 136 ( Figure 3 ). The upper bracket 186 includes one or more biasing mechanisms, such as a spring that supports the cutting wheel 198 (i.e., the cutting blade). In some embodiments, the upper bracket 186 includes a surface that prevents the tube 120 from moving too much into the cutting area 194. In the illustrated embodiment, the upper bracket 186 includes a dual cam (not shown) shaft that has two functions, namely an automatic spring loading function and an automatic locking function, as described at least in U.S. Patent No. 10,046,470, the entire contents of which are incorporated herein by reference. The lower bracket 190 includes a body 206 with support rollers 210, 214, which define a support surface for the tube 120. The body 206 includes a surface 218 to prevent the tube 120 from moving too much into the cutting area 194. The cutting head housing 182 further includes a lever 226 to prevent the tube 120 from being over-inserted into the cutting area 194.

[0028] When preparing to use the tube cutter 100, the user selects the tube 120 to be cut and positions the tube 120 within the cutting area 194. Before the tube 120 is inserted, the upper and lower brackets 186, 190 are independent and freely movable (i.e., unlocked). Once the tube 120 is located within the cutting area 194, the upper and lower brackets 186, 190 are biased toward each other, which keeps the tube 120 in the cutting position. The user can start the cutting process by activating the trigger switch 144.

[0029] See also Figure 4A, the cutting head assembly 132 starts at the home position. The home position is characterized by the upper and lower brackets 186, 190 being in an unlocked state and the opening 168 of the head gear 164 being aligned with the opening 116 of the housing 104. The sensor 176 detects when the opening 168 is aligned with the opening 116 and sends a signal to the electronic control unit 172. Pressing the trigger switch 144 activates the motor 128 to drive the gear train 156, which in turn rotates the cutting head assembly 132 in a counterclockwise direction about the first rotation axis 136, as shown in FIG. Figure 4A shown.

[0030] As the cutting head assembly 132 continues to rotate to complete the cut, the cam rod 230 remains aligned with the outer periphery 234 of the cutting head housing 182 so that the cam post 238 does not interfere with the rotation of the cutting head assembly 132 ( Figure 4B When the cutting head assembly 132 has rotated approximately 360 degrees from its original position, the cam post 238 contacts the stop rod 242 ( Figure 4C ). The stop lever 242 is biased toward the cutting area 194 to a locked state by a biasing mechanism such as a torsion spring (not shown). The stop lever 242 is detected by a stop lever sensor (not shown) in a locked state. With the stop lever 242 in the locked state, the cam post 238 continues to move freely along the side edge 246 of the stop lever 242.

[0031] After the complete cutting operation, the user activates the switch 148 to reverse the cutting direction. Then, the trigger switch 144 is continuously pressed to return the cutting head assembly 132 to the original origin position ( Figure 4A ), which prepares the tube cutter 100 to begin another cutting operation. Figure 4D As shown, during the rotation of the cutting head assembly 132 in the homing mode, the cam post 238 engages the lower corner 250 of the stop rod 242. Once the cam post 238 and the stop rod 242 contact, the contact force overcomes the lever torsion spring (not shown), causing the stop rod 242 to move toward the cutting area 194 and reach an unlocked state, as shown in FIG. Figure 4A In the unlocked state, the stopper lever 242 is not detected by the stopper lever sensor 178, and a signal is sent to the electronic control unit 172. The cam lever 230 returns to the position shown in FIG. Figure 4A The position shown in the figure is thereby returned to the unlocked state of the upper and lower brackets 186 and 190. A signal indicating that the cutting head assembly 132 is in the home position is sent to the electronic control unit 172.

[0032] The electronic control unit 172 is programmed to control the rotation of the motor 128 based on the signals from the sensor 176 and the stop rod sensor 178. In the case where the electronic control unit 172 confirms that the stop rod 242 is in the unlocked state and the opening 168 is aligned with the opening 116, the electronic control unit 172 prevents the motor 128 from rotating further in the homing mode because the cutting head assembly 132 is in the home position. In the case where the electronic control unit 172 confirms that the stop rod 242 is in the locked state and the opening 168 is aligned with the opening 116, the electronic control unit 172 allows the motor 128 to continue to rotate further in the homing mode so that the stop rod 242 returns to the unlocked position and the opening 168 is aligned with the opening 116. At this time, the cutting head assembly 132 is positioned in its home position, and the upper and lower brackets 186, 190 are in the unlocked state to release the cutting tube from the cutting area 194 and accept another tube to be cut.

[0033] Figure 5 and 6 1 is shown with additional details regarding the electronic clutch controlled by the electronic control unit 172 as described above. The electronic control unit 172 monitors signals from sensors 176, 178 in the head 108 of the housing 104. In some embodiments, the sensor 176 is a Hall effect sensor for detecting the first magnet 254, the third magnet 258 ( Figure 5 The sensor 176 is used to determine the position of the cutting head assembly 132 during operation and whether the cutting head assembly 132 is in the home position. The pipe cutter 100 also includes a stop rod sensor 178 to detect the second magnet 262 ( Figure 6). The stop lever 242 is mounted on the pin 270 and includes a slot 274. A fastener 278 extends through the slot 274 and limits the pivotal movement of the stop lever 242. When the stop lever 242 is closest to the cutting area 194, the stop lever 242 is in an unlocked state, and when the stop lever 242 is closest to the motor 128, the stop lever 242 is in a locked state. When the second magnet 262 is detected, the stop lever sensor 178 sends a signal to the electronic control unit 172. In other specific embodiments, when the second magnet 262 is not detected, the stop lever sensor 178 sends a signal to the electronic control unit 172. The electronic control unit 172 is programmed to control the rotation of the motor 128 based on the signals from the sensors 176, 178. As a prerequisite for the electronic control unit 172 to set a command to prevent the motor 128 from rotating, the electronic control unit 172 confirms that the stop lever 242 is in an unlocked state (i.e., the second magnet 262 is not detected by the stop lever sensor 178), and the opening 168 is aligned with the opening 116 (i.e., the first magnet 254, the third magnet 258 are detected by the sensor 176). In other words, the electronic control unit 172 recognizes that the cutting head assembly 132 is in the home position, and prevents further rotation of the motor 128. As a prerequisite for the electronic control unit 172 to set a command to continue rotating the motor 128, the electronic control unit 172 confirms that the stop lever 242 is in a locked state (i.e., the second magnet 262 is detected by the stop lever sensor 178), and the opening 168 is aligned with the opening 116. In other words, the electronic control unit 172 recognizes that the cutting head assembly 132 is not in the home position, and continues the rotation of the motor 128.

[0034] See also Figure 7-10 , the upper bracket 186 includes a first spring 282 and a second spring 286 that support the cutting wheel 198. The first and second springs 282, 286 are each disposed on opposite sides of a cutting plane 292 defined by the cutting wheel 198, and the cutting wheel 198 runs perpendicular to the direction of the tube 120. The first and second springs 282, 286 are biased toward the lower bracket 190 so that the cutting wheel 198 has a force sufficient to cut the tube 120. In other specific embodiments, the upper bracket 186 includes an additional spring 296 to increase the cutting force of the cutting wheel 198 ( Figure 7 The lower bracket 190 is biased by a spring 300 to maintain contact with the tube 120 by the rollers 210, 214 during the cutting process ( Fig.10). In the case after a successful cut, the first and second springs 282, 286 move toward the tube 120. The first and second springs 282, 286 include an integrated abutment member 304 configured to hold the tube 120 when fully cut. The abutment member 304 extends toward the tube 120. The cutting wheel 198 includes a first shoulder 308 and a second shoulder 312 disposed on opposite sides of the cutting plane 292, which are configured to support the tube 120 when fully cut. The combination of the first shoulder 308, the second shoulder 312 and the abutment member 304 ensures that the tube 120 is held via the upper bracket 186 at a total of two points on each side of the cutting plane 292 (i.e., a total of 4 points). The tube 120 is biased toward the lower bracket 190 via the four contact points of the upper bracket 186, and the lower bracket 190 is biased toward the upper bracket 186. Therefore, due to the relative biasing forces of the upper bracket 186 and the lower bracket 190 , both pieces of the cut tube 120 are retained by the contact points, preventing the short section of the cut tube 120 from falling out of the tube cutter 100 .

[0035] As described above, the trigger switch 144 activates the motor 128, causing the cutting head assembly 132 to rotate to perform the pipe cutting operation. Specifically, the electronic control unit 172 receives the second signal from the trigger switch 144 and provides current to the motor 128, thereby rotating the cutting head assembly 132. Also as described above, the switch 148 is operable to reverse the direction of rotation of the motor 128, thereby reversing the direction of rotation of the cutting head assembly 132. Specifically, the electronic control unit 172 receives the third signal from the switch 148 and reverses the direction of the motor 128, thereby changing the direction of rotation of the cutting head assembly 132. The user can press the switch 148 for a first amount of time within a first time range to control the direction of the motor 128. For example, the first time range can be between zero and three seconds. In the event that the user presses the switch 148 within the first time range, the pipe cutter 100 will enter the homing mode from the cutting mode. In other specific embodiments, the time range can be between zero and a duration of less than or greater than three seconds. The switch 148 also has a "lock" function (i.e., placing the pipe cutter 100 in a locked state). Specifically, the electronic control unit 172 receives a first signal from the switch 148 and prevents the motor 128 from being activated or operated. A user may press the switch 148 for a second amount of time within a second time range different from the first time range to transition the tube cutter 100 to the locked state. For example, the second time range may be any time greater than three seconds. In other specific embodiments, the second time range may be greater than a duration less than or greater than three seconds. The locked state prevents the motor 128 from being activated via the electronic control unit 172. For a user to exit the locked state, the switch 148 must be pressed for a third amount of time within the second time range, which enables the electronic control unit 172 to enable the motor 128 to operate.

[0036] In the event that the tube cutter 100 is in the locked state and the user removes the battery pack 124, the tube cutter 100 will remain in the locked state. Once the battery pack 124 is reconnected, the tube cutter 100 will remain in the locked state until the user presses the switch 148 for a third amount of time.

[0037] In the event that the tube cutter 100 remains idle for a long period of time (e.g., during a period when the switches 144, 148 are not activated), the tube cutter 100 reverts to the power saving mode. In the power saving mode, the current drawn from the battery pack 124 is reduced. When the tube cutter 100 is reactivated from the power saving mode, the default mode of the tube cutter 100 is the homing mode. In the event that the tube cutter 100 enters the power saving movement from the locked state, the tube cutter 100 will not revert from the power saving mode to the homing mode. When returning from the power saving mode, the tube cutter 100 will remain in the locked state.

[0038] In other embodiments, the trigger switch 144 activates the motor 128 of the tube cutter 100 to perform the tube cutting operation. For users who want to reverse the cut, the switch 148 is pressed continuously to return the cutting head assembly 132 to the home position.

[0039] In other embodiments, the trigger switch 144 activates the motor 128 of the tube cutter 100 to perform the tube cutting operation. For users who want to reverse the cut, the switch 148 is pressed and released to return the cutting head assembly 132 to the home position.

[0040] In other embodiments, the tube cutter 100 includes a rocker switch rather than a push button switch or a momentary switch. The rocker switch has a first position corresponding to a first rotational direction of the cutting head assembly 132 and a second position corresponding to a reversed second rotational direction (i.e., a homing mode) of the cutting head assembly 132. A user actuates the rocker switch to the first position or the second position to activate the motor 128 and cause the tube cutter 100 to perform a tube cutting operation or enter the homing mode.

[0041] Although the invention has been described in detail with reference to certain preferred specific embodiments, variations and modifications exist without departing from the scope and spirit of one or more independent aspects of the invention described.

[0042] Various features of the invention are set forth in the following claims.

Claims

1. Electric pipe cutter, characterized in that: The electric pipe cutter comprises: case; a bracket rotatably supported by the housing, the bracket including a cutting edge and a first rotation axis about which the bracket is rotatable; and A brushless DC motor is used to provide torque to the bracket to rotate it, the motor defines a second rotation axis, and the second rotation axis is parallel to the first rotation axis.

2. The electric pipe cutter according to claim 1, characterized in that: Further included is a gear train located between the motor and the carrier, wherein the gear train is configured to transfer torque from the motor to the carrier to rotate it.

3. The electric pipe cutter according to claim 1, characterized in that: The housing includes a head portion in which the bracket is rotatably supported and a handle portion extending from the head portion, and wherein the motor is located within the head portion of the housing.

4. The electric pipe cutter according to claim 3, characterized in that: A user interface is further included, which can be activated by a user to control the motor, wherein the user interface includes a switch on the handle portion and a switch disposed on the head portion.

5. The electric pipe cutter according to claim 3, characterized in that: Further including: A first magnet and a second magnet, wherein the first magnet and the second magnet are disposed on the bracket; and A sensor is disposed in the head and configured to detect the first magnet and the second magnet.

6. The electric pipe cutter according to claim 1, characterized in that: Further including: a user interface, the user interface being activatable by a user to control the motor; and An electronic control unit is coupled to the motor and the user interface, wherein the electronic control unit is configured to set a power saving mode when a user does not activate the user interface.

7. Electric pipe cutter, characterized in that: The electric pipe cutter comprises: a housing including a head portion and a handle portion extending from the head portion; a bracket rotatably supported by the head and having a cutting edge; and A brushless DC motor is used to provide torque to the bracket to rotate it, and the motor is positioned in the head of the shell.

8. The electric pipe cutter according to claim 7, characterized in that: Further included is a lever configured to prevent over-insertion of the tube into the bracket.

9. The electric pipe cutter according to claim 7, characterized in that: Further included is a gear train located between the motor and the bracket, wherein the gear train is configured to transfer torque from the motor to the bracket to rotate it, and wherein the gear train is positioned within the head of the housing.

10. The electric pipe cutter according to claim 7, characterized in that: The bracket is rotatable about a first rotational axis, wherein the motor defines a second rotational axis parallel to the first rotational axis, and wherein the first and second rotational axes extend transversely through the head of the housing.

11. The electric pipe cutter according to claim 10, characterized in that: The handle portion is oriented perpendicular to the second rotation axis.

12. The electric pipe cutter according to claim 7, characterized in that: Further including: a first magnet, the first magnet being disposed on the bracket; and A sensor is disposed in the head and configured to detect the first magnet.

13. The electric pipe cutter according to claim 7, characterized in that: The bracket includes an abutment member configured to engage the first portion of the tube after a complete cutting operation.

14. The electric pipe cutter according to claim 7, characterized in that: Further including: a stop rod disposed in the head; a second magnet disposed on the stop rod; and A sensor is disposed in the head and configured to detect the second magnet.

15. The electric pipe cutter according to claim 7, characterized in that: Further including: a user interface, the user interface being activatable by a user to control the motor; and An electronic control unit, the electronic control unit is coupled to the motor and the user interface, the electronic control unit is configured as follows: receiving a first signal from the user interface when the user interface is activated for a first amount of time within a first time range; and The motor is prevented from operating in response to the first signal.

16. The electric pipe cutter according to claim 15, characterized in that The user interface is a switch placed on the head.

17. The electric pipe cutter according to claim 15, characterized in that The electronic control unit is configured as follows: receiving a second signal from the user interface when the user interface is activated for a second amount of time within the first time range; and The motor is operated in response to the second signal.

18. The electric pipe cutter according to claim 17, characterized in that The electronic control unit is configured as follows: receiving a third signal from the user interface when the user interface is activated for a third amount of time outside of the first time range; and The direction of the motor is changed in response to the third signal.

19. An electric pipe cutter, characterized in that: The electric pipe cutter comprises: a housing including a head portion and a handle portion extending from the head portion; a first bracket rotatably supported by the head, the first bracket comprising a first spring including an abutment member; a second bracket rotatably supported by the head; and a cutting edge, the cutting edge being supported by the first spring, the cutting edge comprising a shoulder; Wherein, the abutment member of the first spring and the shoulder of the cutting edge are configured to hold the pipe after complete cutting.

20. The electric pipe cutter according to claim 19, characterized in that Further including: a cutting plane defined by the cutting edge; and a second spring on the first bracket disposed on an opposite side of the cutting plane, the second spring comprising an abutment member, The abutment member of the second spring is configured to retain the tube after complete cutting.

21. Electric pipe cutter, characterized in that: The electric pipe cutter comprises: a housing having a head portion and a handle portion extending from the head portion; a bracket rotatably supported by the head and having a cutting edge; a brushless DC motor, the brushless DC motor being used to provide torque to the bracket to rotate it; a first magnet, the first magnet being disposed on the bracket; a sensor disposed in the head and configured to detect the first magnet; a stop rod disposed in the head; a second magnet disposed on the stop rod; and A detent rod sensor is disposed in the head and is configured to detect the second magnet.

22. The electric pipe cutter according to claim 21, characterized in that Further comprising an electronic control unit coupled to the motor and programmed to control rotation of the motor based on the detected positions of the first magnet and the second magnet, wherein the electronic control unit is configured to confirm that the sensor detects the first magnet and does not detect the second magnet as a prerequisite for setting a command to prevent rotation of the motor.

23. The electric pipe cutter according to claim 21, characterized in that Further comprising an electronic control unit coupled to the motor and programmed to control the rotation of the motor based on the detected positions of the first magnet and the second magnet, wherein the electronic control unit is configured to confirm that the sensor detects the first magnet and the second magnet as a prerequisite for setting a command to continue the rotation of the motor.

24. The electric pipe cutter according to claim 21, characterized in that Further comprising a third magnet disposed on the bracket, wherein the sensor is configured to detect the first magnet and the third magnet.

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