Hand-held power tool having a front handle with a vibration suspension at one end and rigidly or pivotably attached to the main body at the other end

Abstract

A hand-held power tool (100, 500) comprising a main body (110) extending in a longitudinal direction (L), a saw blade arrangement (120) supported by the main body (110), an electric motor (170), a receptacle for receiving and holding a replaceable battery (150) or a battery adapter, wherein the tool (100, 500) is arranged to be at least partially guided by a front handle (130) attached to the main body (110), wherein the front handle (130) comprises an elongated member (310) extending transversely across the main body (110) from a first end (131) of the front handle to a second end (132) of the front handle, wherein the front handle (130) is attached to the main body (110) at the first end (131) via a vibration dampening arrangement (160) and rigidly or pivotably attached to the main body (110) at the second end (132).

Description

Technical Field

[0001] This disclosure relates to handheld construction equipment for processing hard materials such as concrete and stone. This disclosure also relates to a handle with vibration damping capabilities, a handle including a vibration sensor, and associated construction equipment. Aspects of this disclosure can also be applied to forestry equipment such as chainsaws. Background Technology

[0002] Handheld power tools used for cutting concrete and stone (often called power cutters or scissors) have traditionally been powered by internal combustion engines. However, battery-powered power cutters are becoming increasingly common. Converting an internal combustion engine-powered tool to a battery-powered one is not always easy, as the required batteries are typically very large and heavy.

[0003] Vibrations generated during the use of handheld power tools can cause injury to the operator. Several vibration damping systems are known to mitigate the harmful effects of vibration on components such as the tool handle. A less complex and more cost-effective vibration damping system is desired. Summary of the Invention

[0004] The purpose of this disclosure is to provide an improved construction equipment and electric work tool. This purpose can be at least partially achieved by a handheld electric device having the technical features set forth in the appended claims. Many aspects discussed herein are also applicable to forestry equipment, such as chainsaws for cutting timber and other materials.

[0005] Certain aspects of this disclosure relate to a handheld electric construction device comprising: a body extending longitudinally between a first lateral side and a second lateral side; a saw blade assembly supported by the body; an electric motor; and a housing for receiving and holding a replaceable battery or battery adapter. The battery housing may also be referred to as a battery compartment. The device is arranged to be guided by an operator at least partially using a front handle attached to the body, and the saw blade assembly includes at least two parallel saw blades with a drive mechanism sandwiched between them. The electric motor is arranged to drive the saw blade assembly via the drive mechanism. The outer saw blade of the saw blade assembly extends in an outer saw blade plane flush with the first lateral side of the construction device.

[0006] "Flush cutting" refers to a cutting operation performed close to or at least near a wall, ceiling, or other obstruction. The handheld electric construction equipment disclosed herein allows for flush cutting in an efficient manner because the battery does not protrude laterally from the machine beyond the saw blade assembly to prevent flush cutting. Nevertheless, relatively large batteries can also be mounted in the machine because they can be received in a laterally offset manner in a receiving compartment, as will be described in more detail below. The receiving compartment may, for example, include a battery compartment that extends laterally through the body away from a first lateral side of the construction equipment. The battery compartment can be open on both lateral sides of the construction equipment, i.e., formed as a through-hole battery compartment, or it can be closed on one lateral side of the construction equipment. In both cases, effective ventilation can be provided for the battery, which is an advantage because the battery can then be cooled during use. Effectively cooled batteries suffer from a lower risk of overheating.

[0007] The front handle of the device can be arranged to extend laterally from the main body in the same direction as the battery received in the housing by a lateral handle extension distance. The replaceable battery, received in the housing, preferably extends laterally from the main body by a distance within 10% of the lateral handle extension distance, and more preferably within 5% of the lateral handle extension distance, or even within 1% of the lateral handle extension distance. This means that the distance the battery extends laterally from the main body of the device is approximately the same as the distance the front handle extends laterally from the main body of the device, such that the battery is at least partially protected by the front handle. According to other examples, the distance the front handle extends from the main body is longer than the distance the battery extends from the main body. This is an advantage because the device is at least partially supported by the front handle when the battery is placed on the ground with the battery facing down.

[0008] According to some aspects, when the replaceable battery is received in the housing, the center of gravity of the replaceable battery is offset relative to the central plane of the device from the first lateral side of the construction device. This offset helps the device maintain balance during flush cutting. The center of gravity of the battery can be roughly aligned with the lateral center of the front handle of the device, which also helps with balance during use.

[0009] The front handle of the device advantageously includes a vibration damping device configured to suppress the transmission of vibrations from the device to the front handle (e.g., when the saw blade is engaged with the workpiece). The front handle may, for example, include an elongated member, such as a curved rod-shaped handle, extending laterally across the body from a first end to a second end. The front handle is attached to the body at the first end via the vibration damping device and rigidly attached to the body at the second end, or at the second end via an attachment member that is significantly more rigid than the vibration damping device at the first end. This is a cost-effective way to achieve vibration damping in the front handle, as only one vibration damping element is required. According to some aspects, the front handle is pivotally attached to the body at the second end.

[0010] The aspects related to vibration damping devices also apply to forestry equipment such as chainsaws.

[0011] Vibration damping devices may include, for example, elastic members, such as springs or bushings made of elastic material. The attachment at the second end (if not rigid) may be a plastic or hard rubber component. According to a preferred embodiment, the vibration damping device at the first end includes a helical spring, such as a steel spring, extending from the end of the first coil to the end of the second coil, wherein a flexible and inextensible central member extends from the end of the first coil to the end of the second coil within the helical spring. This type of vibration damping device used at the first end of the front handle, in conjunction with a rigid or at least secure attachment of the front handle at the second end, has proven to provide good vibration damping. An advantage is that only a single coil is required, thus reducing the cost of the vibration damping device.

[0012] According to other aspects of this disclosure, the construction equipment includes a control unit arranged to control an electric motor. In addition to starting and stopping the motor, the control unit can also, for example, control the motor's drive speed. The control unit can be arranged to detect backlash in the construction equipment and, in response to detecting such backlash, rapidly reduce the drive speed of the electric motor. This protects the operator in the event of a backlash event. An electrically powered cutting and crushing tool, powered by a rechargeable battery and having backlash protection implemented in this way, is both an effective and safe tool.

[0013] The construction equipment may also include a vibration sensor disposed in the front handle. In this case, the control unit can be configured to monitor the vibration level in the front handle via the vibration sensor and trigger vibration mitigating action when the vibration level is detected to be below a predetermined acceptable vibration level standard. This allows for verification of whether the vibration level in the front handle is acceptable, which is an advantage. It also allows for detection of vibration suppression device failures and appropriate action, which is another advantage. The vibration sensor may include, for example, an inertial measurement unit (IMU), a microphone, and / or a piezoelectric element. Vibration mitigation action may include, for example, issuing a warning signal to the user of the construction equipment and / or reducing the drive speed of the electric motor. Of course, the construction equipment can also be deactivated if the vibration sensor detects a harmful level of vibration.

[0014] A similar vibration sensor can be placed in the rear handle. In this case, the first vibration sensor monitors the vibration level in the front handle, while the second vibration sensor monitors the vibration level in the rear handle of the construction equipment. The control unit can apply different vibration level acceptance criteria to the front and rear handles.

[0015] The control unit can also be configured to store the monitored vibration levels in an interface-accessible storage device, and / or store statistical data such as peak vibration amplitude, changes in vibration levels, and average vibration levels. Operators or technicians can then read the stored data to analyze usage and ensure that operators are not affected by harmful levels of vibration.

[0016] According to a preferred aspect, the control unit determines that the vibration amplitude exceeds a predetermined threshold (such as 2.5 m / s²). 2 The control unit can monitor a user's daily vibration exposure over a specific time period to ensure that the daily exposure does not exceed legal thresholds. The control unit can also be configured to use the power tool to acquire the operator's personally identifiable information and separately track the vibrations experienced by two or more operators. This allows for monitoring the daily vibration exposure of more than one operator for a given power tool.

[0017] This disclosure also relates to a computer-implemented method executed by a control unit configured to control a handheld electric construction device, the handheld electric construction device including a front handle with an integrated vibration sensor, and potentially a rear handle with an integrated vibration sensor. The method includes: monitoring vibration levels in the front handle by the vibration sensors, and triggering vibration damping actions by the construction device when the detected vibration level does not meet a predetermined vibration level acceptance criterion. As mentioned above, vibration damping actions may include issuing a warning signal to the user of the construction device, reducing the drive speed of the electric motor, or disabling the construction device. Optionally, a second vibration sensor may be disposed in the rear handle for measuring the vibration level in the rear handle. Of course, vibration damping actions may also be triggered if the daily vibration exposure index does not meet an associated acceptance criterion.

[0018] The aspects related to the vibration sensor device configured in the front and / or rear handle of the device are also applicable to forestry equipment, such as chainsaws used for cutting wood and other materials.

[0019] This article also discloses related methods and various forms of construction equipment that have the same advantages as those discussed above in conjunction with the control unit.

[0020] Generally, unless otherwise expressly defined herein, all terms used in the claims should be interpreted according to their ordinary meaning in the art. Unless otherwise expressly stated, all references to “a / an / the element, device, component, apparatus, step, etc.” should be interpreted openly as referring to at least one example of the element, device, component, apparatus, step, etc. Unless explicitly stated otherwise, the steps of any method disclosed herein need not be performed in the exact order disclosed. Other features and advantages of the invention will become apparent from a review of the appended claims and the following description. Those skilled in the art will recognize that different features of the invention can be combined to form embodiments other than those described below without departing from the scope of the invention. Attached Figure Description

[0021] This disclosure will now be described in more detail with reference to the accompanying drawings, in which: Figures 1A to 1B An exemplary handheld power tool is shown; Figures 2A to 2B A vibration damping element for the front handle of a power tool is shown; Figure 3A A power tool front handle with vibration damping elements is shown; Figure 3B A portion of an exemplary handheld power tool is shown; Figure 3C A rear handle with vibration damping elements is shown; Figure 4 The vibration damping feature of a handheld power tool is shown. Figure 5 An exemplary handheld power tool with vibration damping is shown; Figure 6 This is a flowchart illustrating some of the methods; Figure 7 The control unit is shown schematically; Figure 8 The computer program product is illustrated schematically. Figures 9A to 9B An exemplary battery compartment is shown; and Figures 10A to 10C An exemplary rechargeable battery is shown. Detailed Implementation

[0022] Various aspects of this disclosure will now be described more fully with reference to the accompanying drawings. However, the different apparatuses and methods disclosed herein can be implemented in many different forms and should not be construed as limited to the aspects set forth herein. Like reference numerals in the drawings consistently denote the same elements.

[0023] The terminology used herein is for the purpose of describing various aspects of this disclosure only and is not intended to limit the invention. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well.

[0024] Figures 1A to 1B An exemplary handheld power tool 100 is shown. This specific example is a so-called cutting and crushing tool. Cutting and crushing tools are generally known and have been previously described, for example, in US 6,874,400 B2 and US 7,571,720 B2. Cutting and crushing tools include at least two parallel saw blades and are capable of making relatively deep cuts compared to conventional handheld cutting tools, which is an advantage.

[0025] Figure 5 Another exemplary handheld power tool 500 is shown. This tool is a cutting tool with a single abrasive saw blade, sometimes also called a power cutter. This disclosure is not limited to any particular form of construction equipment, but is most advantageously applied to electrically powered cutting and breaking tools as well as electrically powered cutting tools.

[0026] Both tools 100 and 500 include a saw blade support device 120. Figure 5The body 110 of the saw blade (shown only schematically) is illustrated herein. The operator guides the tools 100, 500 using a front handle 130 and a rear handle 140 during sawing. The front handle 130 extends at a distance from the body 110. A space or gap is formed between the body 110 and the front handle 130 to allow the operator to grip the front handle without interfering with the body 110. In the example disclosed herein, the front handle 130 includes an elongated member extending laterally from a first end 131 of the front handle across the body 110 to a second end 132, wherein the front handle 130 is spaced apart from the body 110 between its first end 131 and its second end 132. The distance between the central section 133 of the front handle 130 and the body 110 is approximately a few centimeters, such as greater than 5 centimeters.

[0027] The various technical features of this disclosure will primarily be combined with power cutting machines (such as...) Figures 1A to 1B and Figure 5 The devices 100 and 500 in the figures are discussed. However, it should be understood that many of these features can also be advantageously applied to other types of tools, such as forestry equipment (such as chainsaws), which also include front handle 130 and rear handle 140 similar to those shown in the figures.

[0028] The saw blades on handheld power tools discussed in this article comprise abrasive elements configured to cut hard materials such as concrete and stone. Saw blades are typically diamond saw blades. Diamond saw blades have diamond cutting segments fixed to their edges for cutting hard materials. Many types of diamond blades exist, and they have a wide range of applications, including cutting stone, concrete, asphalt, brick, glass, and ceramics. Diamond saw blades are generally known and will therefore not be discussed in further detail here.

[0029] Figure 1A and Figure 5 The exemplary rear handle 140 includes a trigger 145 and a trigger locking device 146. The trigger locking device 146 prevents the operator from accidentally actuating the trigger 145. Various trigger locking devices are known. This particular example requires the operator to first press the trigger locking device 146, for example, with the palm of their hand, so that the trigger 145 can be pressed by the trigger finger of the same hand.

[0030] The longitudinal symmetry plane of the rear handle 140 can be used to define the center plane C of the power tool, such as Figure 1B As shown. The normal to the center plane defines the lateral direction of the device. The center plane C is aligned with one or more extended planes of the saw blade of the device.

[0031] exist Figures 1A to 1B and Figure 5The exemplary front handle 130 shown is a rod-shaped handle that extends laterally from the first end 131 of the handle across the body 110 to the second end 132 of the handle. The central section 133 of the front handle 130, positioned above the center plane C of the tool, is substantially perpendicular to the center plane C. This allows the operator to grip the front handle 130 with their left hand and the rear handle with their right hand, thus guiding the tool ergonomically during use. The lateral midpoint of the front handle 130 is located at... Figure 1B The value is shown as the midpoint of the double-dotted line, 134.

[0032] This disclosure is not limited to Figures 1A to 1B and Figure 5 The example illustrates a power tool of the rear handle type. Aspects of this disclosure can also be advantageously applied to power tools of the top handle type, where the rear handle is positioned closer to the top of the power tool, for example, as in the power tool described in US 2012 / 0102766A1, where the rear handle is referred to as the control portion and the front handle as the grip portion.

[0033] Figures 1A to 1B and Figure 5 Both power tools 100 and 500 are battery-powered handheld power tools. The replaceable and rechargeable battery 150 is supported by the main body 110 during use. Figure 5 (Not shown in the image). According to a preferred aspect of this disclosure, the term "replaceable" means that the battery can be replaced without special tools and without first disassembling some parts of the body 110. It should be understood that the replaceable battery 150 is not a permanently installed battery in the body 110, and at least a portion of the body must be removed before the replaceable battery can be removed. The following will be combined with... Figures 10A to 10C Discuss examples of rechargeable and replaceable batteries.

[0034] exist Figures 1A to 1B The handheld electric construction device 100 shown includes a body 110 extending longitudinally from a rear handle 140 along a central plane C toward a front handle 130. The body 110 has a first lateral side S1 and a second lateral side S2 separated by the central plane C. The lateral sides S1 and S2 are connected by a top side T and a bottom side B of the device, as shown. Figure 1B The illustration shows the device viewed from the front. Figure 1B As shown, the central plane C of the construction equipment divides the equipment in the longitudinal direction along the plane of symmetry of the rear handle 140.

[0035] Figure 1AThe diagram shows the upward direction U and the downward direction D. The upward direction U and the downward direction D are not necessarily associated with the alignment of machine 100 in use. However, these directions can be very useful in indicating the relative positions of various details on the machine, such as: the bottom side of the machine, which is the side facing downward; and the top side of the machine, which is the side facing upward. The top side of the machine faces upward U, and the bottom side of the machine faces downward D.

[0036] Construction equipment 100 includes an electric motor 170 and a housing for receiving and holding a replaceable battery 150 to power the electric motor. A control unit 180 is arranged to control the electric motor, for example, based on an input signal from a trigger 145. The control unit 180 can perform additional functions, such as monitoring and recording vibration levels measured by vibration sensors arranged in the front and / or rear handles of the equipment 100. The following will be combined with… Figure 7 An exemplary control unit will be discussed in more detail.

[0037] The aspects related to the vibration damping devices in the front and rear handles of this equipment are also applicable to forestry equipment such as chainsaws.

[0038] The aspects related to the vibration sensor devices in the front and rear handles of this equipment are also applicable to forestry equipment such as chainsaws.

[0039] The saw blade on the chainsaw corresponds to the cutting disc 120 on the power cutting machine discussed in this article.

[0040] It should be understood that the aspects related to flush cutting, vibration suppression, how the front handle is attached to the main body, and vibration sensors are not inextricably linked, but can be implemented independently.

[0041] Of course, the housing can also hold a battery adapter for interface connection to an external energy source, such as a backpack battery pack, i.e., a rechargeable battery pack arranged for the operator to carry using, for example, shoulder straps on the operator's shoulder. The adapter can also be used for interface connection to other external energy sources such as external battery systems, generators, or power lines. A battery adapter is a battery-shaped device, arranged and held in the housing like a battery, electrically connected to the power tool in the same manner as a battery, and having the same type of electrical characteristics in terms of voltage, etc.

[0042] exist Figures 1A to 1B In the middle, the saw blade device 120 is supported on the machine by the body 110. Figures 1A to 1BThe saw blade assembly 120 on the cutting and crushing tool includes a plurality of parallel saw blades 121, 122, with a drive mechanism sandwiched between the saw blades 121, 122. Figures 1A to 1B An exemplary cutter and crusher includes two parallel saw blades. An electric motor 170 is arranged to drive a saw blade assembly 120 via a drive mechanism. The saw blade assembly 120 extends from a body 110 and rests on a support arm having the same lateral width as the saw blade assembly 120. This allows the main body portion of the saw blade assembly and support arm to be deeply inserted into the workpiece, such as a concrete wall. This enables deep cuts.

[0043] Preferably, the saw blade assembly 120 on the cutting and crushing tool 100 and the lateral center of the replaceable battery 150 when received in the receiving section are separated by the central plane C of the construction equipment 100. The lateral center of the battery 150 is located at the midpoint of the battery 150 as measured in a direction orthogonal to the central plane C. Figure 1B In the example, the approximate lateral center of battery 150 can be located, for example, at... Figure 1B The midpoint of the dotted line in the diagram. The center of mass 156 of battery 150 may or may not coincide with the lateral center of battery 150.

[0044] The lateral distance between the saw blade assembly 120 and the longitudinal center plane C of the construction equipment 100, measured in a direction orthogonal to the center plane C (by... Figure 1B (The mark B in the text indicates that it is preferably greater than the lateral distance between the lateral center and the longitudinal center plane C when the replaceable battery 150 is received in the receiving part.)

[0045] According to some aspects, the construction equipment 100 includes a control unit 180 arranged to control an electric motor 170, i.e., to enable and disable the electric motor in response to a signal from a trigger 145. The control unit is typically also configured to control the shaft speed of the electric motor close to a desired shaft speed based on the degree to which the trigger 145 is pressed. The control unit 180 may be arranged to detect a backlash condition of the construction equipment 100, for example by monitoring the motor current of the operating electric motor 170 in a known manner and / or by monitoring the output signal from an inertial measurement unit (IMU) disposed on the equipment. The control unit 180 may then be arranged to reduce the drive speed of the electric motor 170 in response to the detection of a backlash condition, and preferably to stop the electric motor 170 quickly. Backlash detection and mitigation systems are described in detail, for example, in WO2021107842 A1 and WO2022086382 A1, and therefore will not be discussed further herein. The backlash detection and motor braking device in WO2022086382 A1 is compared with... Figures 1A to 1BIt is advantageous to combine the electric cutting and crushing tools because the saw blade assembly 120 on the cutting and crushing tools is relatively lightweight, and therefore the electric motor 170 can be quickly stopped by the control unit 180 in the event of a recoil event.

[0046] Figures 1A to 1B The outer saw blade 121 of the saw blade assembly 120 in the cutting and breaking tool extends in an outer saw blade plane 125 that is flush with the first lateral side S1 of the construction device 100. Here, "flush" should be interpreted as substantially aligned with the first lateral side S1, meaning that no part of the construction device extends beyond the outer saw blade plane by more than 20 mm, and preferably no more than 10 mm, and even more preferably not at all. This allows the cutting and breaking tool to be used for flush cutting close to walls and floors.

[0047] refer to Figure 1B The construction equipment 100 includes a right-hand lateral side S1, which is substantially flat and aligned with the rightmost saw blade 121 of the saw blade assembly 120. This means that the cutter and shredder 100 can engage the workpiece for cutting very close to, for example, a wall, ceiling, floor, or some other obstacle, because the lateral side S1 of the machine 100 can be firmly held against the obstacle (such as a wall or ceiling) as the saw blade assembly 120 cuts into the workpiece.

[0048] It should be noted that the front handle 130 extends laterally across the body 110 from a position on the first lateral side S1 to a position on the second lateral side S2. The rod-shaped front handle 130 is attached to a position near the bottom side B of the tool 100, meaning that the operator can easily hold the front handle 130 even when the first lateral side S1 is firmly held against the floor of the work site. Some of the front handles discussed herein are secured by supports under the machine, as will be discussed below. Figure 3B To be discussed in more detail.

[0049] According to some aspects, the receiving portion includes a battery compartment 155 that extends laterally through the body 110 from a first lateral side S1 away from the construction device 100. The battery compartment 155 may be open on both lateral sides S1, S2 of the construction device 100 to form a through-hole battery compartment, or the battery compartment may be open only on one side of the body to form a battery receiving cavity. According to other aspects, the battery compartment is a cavity extending downward from the top side (T) of the machine in use into the body. Some aspects of the construction device disclosed herein may also include a battery compartment 155 closed on one of the lateral sides S1, S2, thereby forming a cavity or slot into which a battery can be inserted from the open side of the battery compartment.

[0050] According to some aspects, the front handle 130 extends from the second lateral side S2 of the cutting and crushing tool 100 by a lateral handle extension distance D, such as Figure 1B As shown in the diagram. The distance D can correspond to the distance D that the battery 150 extends from the second lateral side S2. (Also as) Figure 1B (As shown in the diagram). Thus, the rod-shaped front handle provides some protection for the battery 150. According to some aspects, the distance D from the body 110 when the replaceable battery 150 is received in the receiving portion... Within 10% of the lateral handle extension distance D.

[0051] When the replaceable battery 150 is received in the receiving section, the center of mass 156 of the replaceable battery can be arranged to be offset away from the first lateral side S1 of the construction equipment 100 relative to the center plane C of the equipment 100. By shifting the battery to one side and away from the saw blade assembly in this way, more precisely, towards the second lateral side S2, as... Figure 1B As shown, flush cutting is possible even with a large and heavy battery. Having a large rechargeable battery is advantageous because it extends the operating time of the construction equipment 100. According to some aspects, viewed from the top side T of the construction equipment 100, the center of mass 156 of the replaceable battery 150 is located to the left of the central plane C. In other words, the battery 150 is asymmetrically arranged relative to the central plane C when installed in the construction equipment 100, and is offset away from the outer saw blade plane 125 in the direction of the second lateral side S2.

[0052] The lateral midpoint 134 of the front handlebar 130 (e.g.) Figure 1B (As shown) is preferably aligned with the center of mass 156 of the battery 150 when it is received in the housing 155.

[0053] According to some aspects, the receiving portion 155 is configured to receive the battery 150 from the second lateral side S2. This means that the battery 150 is inserted into the receiving portion 155 from the second lateral side S2 along its insertion direction, and is also removed from the battery compartment from the second lateral side S2. This is advantageous, for example, because the construction equipment 100 can be placed in a stationary position on the floor with the first lateral side S1 facing downwards, and the battery 150 can then be conveniently lifted upwards out of the battery compartment.

[0054] According to some aspects, the battery compartment 155 is closed on one of the lateral sides S1 and S2 of the construction device 100 (preferably the first lateral side S1). In this case, the battery compartment is not a through-hole battery compartment, but a cavity or slot that is closed at its sides and bottom and open only at one end, into which the battery can be inserted in the insertion direction.

[0055] According to an exemplary geometry of the cutting and crushing tool, the front handle 130 is configured to extend from the body 110 by a lateral handle extension distance D, which is measured in a direction orthogonal to the central plane C. The replaceable battery 150, when received in the receiving portion, is also configured to extend from the body 110 by distance D. (like Figure 1B As shown in the diagram, this distance is within 10% of the lateral handle extension distance D. Distance D The distance D is preferably equal to or at least approximately equal to the distance D.

[0056] According to a preferred embodiment, when the battery 150 is received in the receiving portion, the center of mass 156 of the battery is located within 5 cm of the lateral midpoint 134 of the front handle 130, a distance measured from the central plane C. This allows the operator to grip the front handle approximately at the lateral center of mass of the battery 150, thereby enabling balanced guidance of the device.

[0057] according to Figures 1A to 1B Another exemplary geometry of the cutting and crushing tool illustrated herein is shown, in which the front handle 130 is arranged to extend laterally from the body 110 by a distance D, while the replaceable battery 150 extends from the body 110 by a distance D. This distance is less than the lateral handle extension distance D, such as less than 5cm.

[0058] The front handle 130 of the construction equipment 100, 500 preferably includes a vibration damping device 160 configured to suppress vibrations in the front handle 130, thereby preventing the operator from experiencing inconvenience or injury due to vibrations generated at the saw blade assembly 120 and / or by the electric motor 170. The front handle 130 may optionally include, for example... Figure 3A The elongated rod-shaped member 310 shown is bent to extend laterally from a first end 131 across the body 110 to a second end 132, as described above. The front handle 130 may be attached to the body 110 at the first end 131 via a vibration damping device 160, and rigidly or at least securely attached to the body 110 at the second end 132. In other words, the front handle 130 is damped by a vibration damping element only at one end, while no vibration damping element is provided at the other end. This damping end is the end that is typically closest to the operator's hand when gripping the front handle 130, i.e., the end of the front handle 130 closest to the central section 133 of the front handle 130. It has been found that, for Figures 1A to 1B and Figure 5For the type of construction equipment shown, this asymmetric vibration suppression device provides satisfactory vibration suppression. It is advantageous to position the vibration suppression device 160 at the first end 131 of the front handle 130, as this provides better stability for the front handle 130 and the entire construction equipment 100 during cutting operations.

[0059] Figure 3B A portion of an exemplary handheld power tool 100 is shown as viewed from below (i.e., from the side facing the ground during normal use). In this case, the second end 132 of the front handle 130 extends laterally across the tool and is attached by a bracket 320. The front handle 130 is extended through... Figure 3A The hole 330 seen in (its in Figure 3B The front handle 130 is held in place by a fastening element (covered by a bracket 320). The hole 330 can be formed slightly larger than the fastening element. This allows the front handle 130 to pivot relative to axis A when combined with the bracket, thereby reducing some vibration. Therefore, the second end does not need to be rigidly attached at the second end, but can be pivotally attached to allow rotation about axis A. Typically, the attachment at the second end 132 can be configured to allow pivoting about axis A transverse to the power tool. In this case, the attachment at the second end 132 prevents lateral movement of the front handle; that is, the front handle cannot be pulled out of the tool laterally or moved along axis A. The front handle 130 can be firmly attached to the body in the direction of axis A, but can be pivotally attached to allow rotation about axis A.

[0060] Figure 3B The pivotable attachment method illustrated herein can also be used in other equipment, such as forestry equipment, like chainsaws for cutting timber and other materials. This pivotable attachment can be used as a standalone feature and is not inextricably linked to any other feature disclosed herein. Figure 3B A handheld electric device is shown, comprising a body 110, a front handle 130, and a rear handle 140, wherein the front handle 130 includes a first end 131 ( Figure 3B An elongated member 310 (not shown) extends laterally across the body 110 to a second end 132, wherein a front handle 130 is spaced apart from the body 110 between its first end 131 and its second end 132, and wherein the front handle 130 is pivotally attached to the body 110 at the second end 132 to allow pivoting about an axis A extending laterally across the body 110. This pivotable attachment reduces vibrations transmitted to the front handle. This pivotable attachment is transverse to the longitudinal direction of the device and therefore does not impede the operation of the device. The front handle is preferably fixed to the device in the transverse direction (i.e., along axis A), meaning that the front handle cannot move along axis A.

[0061] It should be understood that the second end need not be completely rigidly attached to the second end 132. It can also be attached by an attachment member that is significantly more rigid than the vibration damping device 160 at the first end 131, achieving the same or similar technical effect. In other words, the second end can be firmly attached to the second end 132, where "firmly" means that the attachment at the second end has significantly less elasticity compared to the attachment at the first end. The attachment at the first end 131 may, for example, include… Figures 2A to 2B The type of helical spring 200 shown may include a plastic component or a hard rubber or silicone bushing at the second end 132.

[0062] Furthermore, it has been found that this type of asymmetric vibration damping system works particularly well during flush cutting operations, where the portion of the machine held firmly against, for example, a floor or wall, is vibrationally decoupled from the front handle (at the first end 131). The other side of the machine (i.e., the second lateral side S2 away from the floor or wall) does not transmit as much vibration to the second end 132 of the front handle 130. By rigidly or securely connecting the second end 132 of the front handle 130 to the second lateral side S2 of the body 110, the overall stability and usability of the machine 100 are improved.

[0063] The vibration damping device 160 can be attached to the main body at the first lateral side S1 of the main body 110.

[0064] In the illustrated example, the vibration damping device 160 at the first end 131 is positioned closer to the operator's hand in use than the attachment point of the front handle at the second end 132 to the body 110.

[0065] The exemplary vibration damping device 160 shown in the accompanying drawings extends substantially parallel to the outer saw blade plane 125. The vibration damping device 160 also preferably extends parallel to the center plane C of the construction equipment 100 and at an angle α (e.g., in the longitudinal forward direction of the construction equipment) in the longitudinal direction of the construction equipment. Figure 1A (as shown in the diagram). Angle α is an acute angle, preferably about 5 to 45 degrees.

[0066] When the construction equipment 100 is in the normal operating position, the vibration suppression device 160 at the first end 131 can also be offset upward relative to the vertical center of mass of the main body 110.

[0067] According to some aspects, the front handle 130 extends laterally from the body 110 at its second end 132 in a direction orthogonal to the outer saw blade plane 125 (i.e., substantially perpendicular to the outer saw blade plane 125). This attachment orientation provides some stability to the front handle during use and also helps to reduce vibrations transmitted from the second end 132 of the front handle to the front handle.

[0068] Vibration damping device 160 may include, for example, an elastic member, such as a spring or an elastic material bushing. Figures 2A to 2B An exemplary vibration damping device 160 is shown, which includes a helical spring 200 extending from a first coil end 210 to a second coil end 220. Figures 2A to 2B The vibration damping device 160 is attached to the rod-shaped handle at the first end 240 and to the body 110 at the second end 250. Figure 2A A 3D view is shown, while Figure 2B A cross-sectional view is shown. A flexible and inextensible central member 230 extends from the first coil end 210 to the second coil end 220 within the helical spring. This flexible and inextensible central member 230 can be, for example, a steel wire or a section of inelastic rope that is easily bent but resists being stretched beyond its nominal length. Examples of such a flexible and inextensible central member 230 can be found in... Figure 2B As seen in [the original text]. The vibration damping device 160 discussed in this article is applicable to the cutter and crusher 100, and is also suitable for [other applications]. Figure 5 The cutting tool 500 may also include a front handle 130, which is vibration-isolated from the body 110 at a first end 131 and at a second end ( Figure 5 It is rigidly attached to the body at a location not shown in the image.

[0069] It should be understood that vibration damping elements, such as coil spring 200, can also be arranged in the rear handle 140. In this case, a section of the rear handle is removed and replaced with a coil spring element. This reduces vibration in the rear handle 140. An exemplary rear handle 140 with a vibration damping element (in this case, coil spring 200) is shown. Figure 3C As shown in the image.

[0070] Although a vibration damping device 160 is provided on the front handle 130 of construction equipment 100, 500, residual vibration amplitudes that are unacceptably strong may still exist under certain usage conditions. Certain aspects of this disclosure relate to a construction device that includes one or more vibration sensors 420 arranged in the front handle 130, such as... Figure 4As schematically illustrated, one or more vibration sensors 420 are fixed along a rod-shaped front handle 130, preferably inside the rod-shaped front handle 130, to measure vibration in real time. Each vibration sensor 420 feeds back a signal or some type of data indicating the measured vibration amount to the control unit 180. Vibration data may include, for example, vibration amplitude, vibration frequency, or a spectrum of vibration amplitude within a certain frequency range. Vibration data may also include information about the duration of the measured vibration.

[0071] The control unit 180 may be arranged to monitor the vibration level in the front handle 130 via at least one vibration sensor 420, and trigger vibration damping when the detected vibration level does not meet a predetermined vibration level acceptance standard. Vibration damping may also be triggered if the measured vibration is higher than a given vibration amplitude and the duration exceeds a threshold duration.

[0072] Vibration level acceptance criteria can be configured based on requirements imposed on devices 100 and 500 in standards, or through actual experiments and / or computer simulations of vibrations in the front handle 130. Vibration level acceptance criteria may include a threshold against which vibration amplitudes are compared. This threshold may be frequency-dependent, such that vibrations at different frequencies are associated with different acceptance levels.

[0073] Vibration level acceptance criteria can also be time-dependent, triggering vibration reduction actions if strong vibrations are measured and their duration is long. Different thresholds can be applied to the integrated vibration magnitude over different time windows. In this way, both the short-term and long-term effects of vibration on users can be effectively addressed by devices 100 and 500.

[0074] Vibration damping actions may include issuing a warning signal to the user of construction equipment 100 or reducing the drive speed of electric motor 170. Depending on the aspect, if the measured vibration is too strong, control unit 180 may deactivate equipment 100 and prevent further use of the equipment. As part of vibration damping actions, messages may be sent to the user of the equipment, such as messages on a display, or the activation of lights or light-emitting diodes (LEDs).

[0075] Vibration reduction actions may also include shutting down device 100, which is preferably combined with sending a message to the user, informing him or her that control unit 180 has detected vibration reaching a dangerous level.

[0076] Vibration sensor 420 may include any one of an inertial measurement unit (IMU) (i.e., an accelerometer), a microphone, and / or a piezoelectric element. These sensors can be connected to control unit 180 via wires 410 arranged inside a rod-shaped front handle 130, which is typically a hollow rod handle.

[0077] A second vibration sensor 147 can be placed in the rear handle (e.g.) Figure 5 (As illustrated in the example), to measure the vibration level in the rear handle, as a supplement to the vibration level measured in the front handle. The control unit can apply individual or identical vibration level acceptance criteria to the vibration levels in both handles.

[0078] The control unit can also be arranged to record one or more vibration levels monitored over time in a storage medium 730 accessible via the control unit's interface 720. This allows for the review of the tool's vibration level history, which is an advantage. The control unit 180 can also be arranged to determine one or more statistical data points of the monitored vibration levels, such as the variance of the vibration, the mean of the vibration, or other statistical data, and store these statistical data points in the storage medium 730 accessible via the control unit's interface 720. The stored data can be formatted, for example, according to a predetermined format, allowing data to be retrieved from the tool and analyzed via wired or wireless means. One example of these statistical data points is a daily vibration exposure index, which indicates the cumulative amount of vibration exceeding an amplitude threshold experienced by the operator over a period of time. Another example is time-duration data, which indicates how long a vibration of a certain amplitude has been recorded.

[0079] The Vibration Control in the Workplace Regulations 2005 is a set of regulations established under the Health and Safety in the Workplace Act 1974 and came into effect in the UK on 6 July 2005. Similar regulations exist in other parts of the world. These regulations hold employers responsible for reducing the health risks to their employees from exposure to vibration, whether caused by the use of handheld or manually operated power equipment, by holding materials being processed by machines, or by sitting or standing on industrial machinery or vehicles. The regulations require employers to conduct exposure assessments to identify whether “exposure action values” or “exposure limits” may be exceeded. “Exposure action values” are daily levels above which employers are required to take action to control the exposure. “Exposure limits” are the maximum amount an employee can be exposed to during a day. These values ​​are calculated using a formula that calculates the average exposure (A) over 8 hours per day. Therefore, these values ​​are written as A(8). The vibration rate of tools or machinery is then calculated in meters (m) per second (s) and written as m / s². The control unit 180 can be configured to compare the measured vibration with such regulatory requirements and verify, for example, whether requirements A(8) are met. If these requirements are not met, warnings can be triggered, and the machine can even be shut down.

[0080] In one example, the control unit detects when vibrations in the front handlebar exceed 2.5 m / s². 2 The system determines the time period during which the vibration level was measured. The control unit can then determine whether the A(8) standard has been met.

[0081] Depending on some aspects, the control unit 180 is arranged to adjust the motor current of the electric motor 170 if the monitored vibration level does not meet the associated acceptance criteria. For example, the motor current may be adjusted to reduce the drive torque, reduce the drive speed, or otherwise reduce the vibration level to a level that meets the acceptance criteria.

[0082] Figure 6 This is a flowchart illustrating a computer-implemented method executed by a control unit 180 configured to control the handheld electric construction equipment 100, 500 disclosed herein, specifically, the equipment 100, 500 including a front handle 130 with one or more integrated vibration sensors 420. The method includes: The vibration level in the front handle 130 is monitored by the vibration sensor 420 (step Sx1), and vibration reduction is triggered by the construction equipment 100 and 500 when the vibration level is detected to be below the predetermined vibration level acceptance standard (step Sx2).

[0083] This method is advantageously performed in construction equipment of the type discussed above, wherein the front handle 130 is attached to the body 110 at a first end 131 via a vibration damping device 160 and rigidly attached to the body 110 at a second end 132.

[0084] According to some aspects, vibration reduction actions include: issuing a warning signal to the user of construction equipment 100 (step Sx21), and / or reducing the drive speed of electric motor 170 (step Sx22). Vibration reduction actions may also include: shutting down equipment 100 (step Sx23).

[0085] According to some aspects, the method also includes recording data associated with the monitored vibration in storage device 730 (step Sx3).

[0086] It should be understood that sensor 420 can also be used for one or more secondary purposes, such as detecting recoil conditions. A sudden, violent movement of sensor 420 can be interpreted as a recoil indication. The control unit can then brake the motor to mitigate the danger associated with a recoil event.

[0087] Figure 9A and Figure 9B Details of an exemplary battery compartment 155 are shown, namely, for receiving and holding replaceable batteries 150 (such as... Figures 10A to 10C An exemplary housing for the battery shown. The replaceable battery 150 can be inserted into the battery compartment 155 in the insertion direction 1000. Figure 9A It is a view opposite to the insertion direction of 1000, and Figure 9B This is a view taken along the insertion direction 1000 into compartment 155. In this example, the receiving portion is a through hole formed in the body 110.

[0088] The battery compartment 155 has a battery locking mechanism including two locking members 950 operable by a button 955. Each locking member includes a leading edge portion arranged to engage with a recess 1080 formed in the battery to lock the battery in place. The locking members can generally be arranged to be spring-biased to a locked position and can be secured by means of, for example... Figure 9B The lever or button mechanism shown is operated. It should be understood that any number of locking components can be arranged in the battery compartment in the manner described above, i.e., from a single locking component to multiple locking components.

[0089] According to some aspects, the battery compartment 155 includes at least one resilient member 930 arranged to push the battery into a locked position, i.e., to push the battery in a direction opposite to the insertion direction 1000. The resilient member 940 pushes the battery when compressed, causing the battery to eject from the battery compartment 155. The resilient member 940 simplifies the removal of the battery 150 from the battery compartment 155.

[0090] In one example, a user inserts the battery into the battery compartment along the insertion direction 1000. When the battery is fully inserted, it contacts the resilient member 940, and the locking member 950 engages with a recess 1080 formed in the battery to lock the battery in place. When compressed by the battery, the resilient member 940 pushes the battery back in a direction opposite to the insertion direction 1000. This thrust from the resilient member increases the contact force between the leading edge portion of the locking member and a surface on the battery arranged to engage the leading edge portion, thus holding the battery more securely in place.

[0091] Batteries used to power heavy-duty cutting tools (such as the work tools discussed herein) are typically quite heavy. Therefore, the batteries must be held securely and reliably in the battery compartment 155. For this purpose, the battery compartment 155 includes a battery holding mechanism specifically designed to support heavy-duty batteries, i.e., heavy-duty batteries weighing approximately 2 kg to 5 kg, such as those between 2.6 kg and 5 kg. Figures 9A to 9B In the example shown, the battery compartment 155 extends laterally through the construction device 100, defining a volume for receiving batteries. This volume is defined by a rear wall Rw and a front wall Fw, wherein the rear wall Rw is positioned toward a rear handle 140 on the tool 100, and the front wall Fw is positioned toward a front handle 130 of the tool 100. A bottom surface Bs and a top surface Fs also define this volume. Figures 9A to 9B An exemplary volume in the example is a rectangular shape with rounded corners.

[0092] The battery holding mechanism includes a support boss 910 disposed on the middle section of the side wall of the battery compartment, more specifically, on the rear wall Rw closest to the rear handle 140. The boss 910 is elongated, extending laterally through the battery compartment and aligned with the insertion direction 1000 along which the battery 150 is inserted into the battery compartment 155. When the installation device 100 is held in the normal operating position, the support boss is parallel to the ground and thus supports the battery against gravity. It should be understood that the support boss 910 may also be disposed on the front wall, i.e., on either the front wall or the rear wall of the battery compartment. Figures 10A to 10C The battery illustrated includes a corresponding groove 1010 that matches the support boss 910.

[0093] Depending on the aspect, the support boss 910 is metal-clad to improve mechanical integrity; that is, the support boss 910 may optionally be constructed with an outer metal layer to improve mechanical stability. The support boss may also be formed entirely of metallic material.

[0094] According to several other aspects, the battery compartment also includes an upper recess 920 and a lower recess 930 for supporting the battery within the battery compartment 155. These recesses are arranged to engage with corresponding ridge structures 1020, 1030 on the battery, allowing the battery to be inserted into the matching recess position in the battery compartment 155 along the insertion direction 1000. Therefore, the support boss 910 and the recesses 920, 930 cooperate to securely and firmly support the battery within the battery compartment. The recesses 920, 930 function to guide the battery when it is inserted into the battery compartment 155 and to prevent jamming when the battery is removed from the battery compartment 155. The recesses 920, 930 are preferably formed as dovetail recesses.

[0095] According to some aspects, grooves 920 and 930 are metal-clad to improve mechanical strength; that is, the grooves are reinforced with a metal lining to improve mechanical stability.

[0096] A contact strip 960 extending in the insertion direction 1000 is arranged in the battery compartment 155 for mating with a corresponding electrical connector 1040 disposed in a slot on the battery 150.

[0097] This document also discloses a battery 150 for insertion into a battery compartment 155, such as Figures 10A to 10C As shown. The battery 150 has a weight between 3 kg and 7 kg and includes a recess 1010 disposed on one side of the battery to mate with a corresponding support boss 910 disposed on the wall of the battery compartment 155. The recess may optionally have an initial bevel to simplify the engagement with the support boss 910. The battery 150 also includes an upper ridge structure 1020 and a lower ridge structure 1030 located on the side of the battery opposite to the recess 1010, as shown. Figure 10B As shown, this is for engaging with corresponding recesses 920, 930 in the battery compartment 155. Therefore, the battery 150 is configured for insertion into the junction. Figure 9A and Figure 9B The battery compartment 155 is under discussion.

[0098] The battery 150 includes at least one recess 1080 configured to receive a corresponding locking member 950 of a battery locking mechanism, as discussed above. The locking member may include a leading edge portion in an arcuate shape, and the recess 1080 includes a surface arranged to engage with the leading edge portion of the locking member. This surface has an arcuate shape that matches the leading edge portion.

[0099] exist Figures 10A to 10C The battery 150 illustrated also includes one or more electrical connectors 1040, which are protectedly arranged in slots extending in the insertion direction to mate with corresponding contact strips 960 arranged in the battery compartment 155.

[0100] Optionally, the battery 150 includes a front surface F1 facing the insertion direction 1000 when the battery is inserted into the battery compartment 155 and a rear surface F2 opposite to the front surface. The rear surface can be advantageously configured as a handle 1050 that allows for one-handed gripping.

[0101] The battery 150 also includes electrical connectors 1040 configured in slots extending in the insertion direction to mate with corresponding contact strips 960 arranged in the battery compartment 155. This protects the electrical connectors from mechanical shock.

[0102] To facilitate battery cooling, an air inlet 1070 is provided on the bottom side of the battery, which is in fluid communication with an air outlet 1060 located on the top side of the battery. Figure 10C As shown. Therefore, airflow from, for example, a fan can be directed through the battery 150 to better cool the battery cells. The battery compartment 155 may include matched lower vents 970 and upper vents 980, as shown. Figures 9A to 9B As shown in the image. Figure 9A The upper vent 980 is connected to the vent 990.

[0103] Figure 7 The general components of control units 180 and 700 are schematically shown in the form of multiple functional units. The processing circuitry 710 is provided using any combination of one or more of a suitable central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), etc., capable of executing software instructions stored in a computer program product, for example, in the form of a storage medium 730. The processing circuitry 710 may also be provided as at least one application-specific integrated circuit (ASIC) or field-programmable gate array (FPGA).

[0104] Specifically, the processing circuit 710 is configured to cause devices 100 and 500 to perform a set of operations or steps, such as combining Figure 6 The methods discussed herein and other content discussed above. For example, storage medium 730 may store the set of operations, and processing circuitry 710 may be configured to retrieve the set of operations from storage medium 730 to cause the device to execute the set of operations. The set of operations may be provided as a set of executable instructions. Thus, processing circuitry 710 is thereby arranged to execute the methods disclosed herein.

[0105] The storage medium 730 may also include permanent memory, which may be any one or a combination of magnetic memory, optical memory, solid-state memory, or even remotely mounted memory.

[0106] The control units 180 and 700 may also include an interface 720 for communicating with at least one external device. Therefore, the interface 720 may include one or more transmitters and receivers, including analog and digital components, and a suitable number of ports for wired or wireless communication.

[0107] The processing circuit 710 controls the general operation of the control units 180 and 700, such as sending data and control signals to the interface 720 and the storage medium 730, receiving data and reports from the interface 720, and retrieving data and instructions from the storage medium 730.

[0108] Figure 8 A computer-readable medium 810 carrying a computer program is shown, the computer program including program code means 820 for execution when the program product is run on a computer. Figure 6 The method shown. A computer-readable medium and a code device can together form a computer program product 800.

Claims

1. A handheld electric device (100, 500) comprising a body (110) extending in a longitudinal direction (L), a saw blade assembly (120) supported by the body (110), an electric motor (170), and a receiving portion for receiving and holding a replaceable battery (150) or a battery adapter. in, The devices (100, 500) are arranged to be at least partially guided by a front handle (130) attached to the body (110). The front handle (130) includes an elongated member (310) extending laterally across the body (110) from a first end (131) of the front handle to a second end (132) of the front handle, wherein the front handle (130) is attached to the body (110) at the first end (131) via a vibration damping device (160) and is rigidly or pivotally attached to the body (110) at the second end (132).

2. The device (100, 500) according to claim 1, wherein, The saw blade assembly (120) includes at least two parallel saw blades (121, 122), with a drive mechanism sandwiched between the at least two parallel saw blades (121, 122). An electric motor (170) is arranged to drive the saw blade assembly (120) via the drive mechanism. The outer saw blade (121) of the saw blade assembly (120) extends in the outer saw blade plane (125). The front handle (130) extends from the body (110) at the second end (132) in a direction orthogonal to the outer saw blade plane (125).

3. The device (100, 500) according to claim 1 or 2, wherein, The vibration damping device (160) includes an elastic component, such as a spring or an elastic material bushing.

4. The device (100, 500) according to any one of the preceding claims, wherein, The vibration suppression device (160) includes a helical spring (200) extending from the end of the first coil (210) to the end of the second coil (220), wherein a flexible and non-stretchable central member (230) extends from the end of the first coil (210) to the end of the second coil (220) inside the helical spring.

5. The device (100, 500) according to any one of the preceding claims, wherein, The vibration damping device (160) is attached to the body at the first lateral side (S1) of the body (110).

6. The device (100, 500) according to any one of the preceding claims, wherein, The vibration damping device (160) at the first end (131) is positioned closer to the operator's hand in use than the attachment point of the front handle to the body (110) at the second end (132).

7. The device (100, 500) according to any one of the preceding claims, wherein, The vibration damping device (160) extends substantially parallel to the outer saw blade plane (125).

8. The device (100, 500) according to any one of the preceding claims, wherein, The vibration damping device (160) extends parallel to the central plane (C) of the device (100, 500) and extends at an angle (a) in the longitudinal forward direction of the device.

9. The device (100, 500) according to any one of the preceding claims, wherein, When the device (100, 500) is in the normal operating position, the vibration suppression device (160) at the first end (131) is offset upward relative to the vertical center of mass of the body (110).

10. The device (100, 500) according to any one of the preceding claims, wherein, The front handle (130) is pivotally attached to the body (110) at the second end (132) so that it can pivot about an axis (A) that extends laterally across the body (110).

11. The device (100, 500) according to any of the preceding claims, comprising a first vibration sensor (420) disposed in the front handle (130), wherein, The control unit (180) of the device (100, 500) is arranged to monitor the vibration level in the front handle (130) via the first vibration sensor (420) and trigger vibration reduction when the vibration level in the front handle does not meet a predetermined first vibration level acceptance standard.

12. The device (100, 500) according to any of the preceding claims, comprising a second vibration sensor (147) disposed in the rear handle (140), wherein, The control unit (180) of the device (100, 500) is arranged to monitor the vibration level in the rear handle (140) via the second vibration sensor (147) and trigger vibration reduction when the vibration level in the rear handle (140) is detected to be inconsistent with a predetermined second vibration level acceptance standard.

13. The apparatus (100, 500) according to claims 11 and 12, wherein, The first vibration sensor (420) and / or the second vibration sensor (147) include an inertial measurement unit (IMU), a microphone, and / or a piezoelectric element.

14. The device (100, 500) according to any one of claims 11 to 13, wherein, The vibration reduction action includes issuing a warning signal to the user of the device (100, 500).

15. The device (100, 500) according to any one of claims 11 to 14, wherein, The vibration damping action includes reducing the drive speed of the electric motor (170).

16. The device (100, 500) according to any one of claims 11 to 15, wherein, The vibration reduction action includes shutting down the equipment (100, 500).

17. The device (100, 500) according to any of the preceding claims, wherein, The handheld electric devices (100, 500) are construction equipment such as power cutters or forestry equipment such as chainsaws.

18. A handheld electric device (100, 500), comprising a main body (110), a front handle (130), and a rear handle (140), wherein, The front handle (130) includes an elongated member (310) extending laterally across the body (110) from a first end (131) of the front handle to a second end (132) of the front handle, wherein the front handle (130) is spaced apart from the body (110) between the first end (131) and the second end (132), wherein the front handle (130) is pivotally attached to the body (110) at the second end (132) so as to be pivotable about an axis (A) extending laterally across the body (110).

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