Handheld power tools with safety switches

Abstract

This invention discloses a handheld power tool (1), comprising: a power tool body (3); a tool (2); a power source (4) configured to provide power to the tool (2); a switch (10) configured to set the power tool (1) to an operating state or a non-operating state; and an elongated handle (20). The elongated handle (20) includes a trigger element (30) configured to be movable relative to the elongated handle (20) such that the trigger element (30) moves relative to the handle (20) when a person grips the handle (20). The switch (10) is disposed at the power tool body (3). The power tool (1) includes a mechanism (7) operably connected to the trigger element (30). The mechanism (7) is configured such that a first mechanism member (11) of the mechanism (7) moves in a direction (d1) toward the switch (10) when the handle (20) is gripped.

Description

Technical Field

[0001] This disclosure relates to a handheld power tool including a switch configured to set the power tool to an operating or non-operating state. Background Technology

[0002] Handheld power tools are tools designed to be supported by one or both hands during operation. Furthermore, handheld power tools include those that can be driven by a power source rather than solely by human power. Power sources can include, for example, internal combustion engines, electric motors, pneumatic motors, etc. Currently, many types of power tools are available on the market. Examples include chainsaws, circular saws, trimmers, hedge trimmers, string trimmers (for lawn mowers), bush cutters, and multi-tools. Power tools are used in industries such as construction, gardening, housework, and around the house for purposes such as cutting, shaping, sanding, grinding, wiring, and polishing.

[0003] All types of power tools share some common issues. One of these is safety. That is, power tools may consist of sharp tools and a powerful power source to power them. Therefore, some power tools include safety switches that set the tool to an operating or non-operating state based on whether the user is gripping the handle. These handles are often equipped with safety mechanisms to ensure the power tool is properly held during operation, for example, when the power tool is held with both hands. Some power tools (such as hedge trimmers) may rotate in multiple directions during operation, and therefore these power tools may be equipped with handles and safety switches to allow the user to hold the power tool in several positions, including both horizontal and vertical positions.

[0004] The types of safety switches mentioned above can significantly increase safety while holding power tools. However, most of these features and functions increase the cost and complexity of power tools, and generally, in today's consumer market, this is an advantage if a product (such as a power tool) has conditions and / or characteristics suitable for cost-effective manufacturing and assembly.

[0005] Furthermore, a challenge encountered when designing power tools that include safety switches is ensuring the reliability and robustness of those switches. This is because power tools typically operate in harsh environments with high levels of dust, debris, water, vibration, etc., and a failure of the safety switch could lead to dangerous situations.

[0006] Other common challenges when designing power tools are compactness and user-friendliness. In other words, an advantage is a power tool designed to be intuitive for the user, and a compact power tool is easier and lighter to use than a bulky one. Summary of the Invention

[0007] The purpose of this invention is to overcome or at least mitigate some of the problems and disadvantages mentioned above.

[0008] According to a first aspect of the invention, this object is achieved by a handheld power tool comprising: a power tool body; a tool; a power source configured to provide power to the tool; a switch configured to set the power tool to an operating or non-operating state; and an elongated handle for a person using the power tool to hold. The elongated handle includes an actuating element extending along at least a portion of the elongated handle and configured to be movable relative to the elongated handle, such that the actuating element moves relative to the handle when the person grasps the handle. The switch is disposed on the power tool body. The power tool includes a mechanism operatively connected to the actuating element. The mechanism is configured such that a first member of the mechanism moves in a direction toward the switch when the handle is grasped.

[0009] Because the mechanism is configured such that the first mechanism component moves toward the switch when the handle is gripped, the provided power tool has the conditions to ensure consistent and reliable actuation and deactivation of the switch.

[0010] Furthermore, because the switch is located within the power tool body, it is protected from dust, debris, water, impact, vibration, and other harmful substances. This allows for a more robust and reliable power tool. As a further result of these features, a safer power tool can be provided.

[0011] In addition, because the switch is located on the power tool body, it provides a more compact power tool, making it easier to use.

[0012] Therefore, a power tool is provided that overcomes or at least mitigates some of the problems and drawbacks mentioned above. Thus, the objectives mentioned above are achieved.

[0013] Optionally, the mechanism includes a second mechanism member connected to a trigger element and a first mechanism member, wherein the first mechanism member is configured to move relative to the switch when the second mechanism member moves. Thus, the provided power tool has the capability to consistently and reliably actuate and deactivate the switch in a simple and efficient manner.

[0014] Optionally, the mechanism is configured such that the first mechanism member moves relative to the switch when the second mechanism member pivots. Thus, the provided power tool has conditions for consistent and reliable actuation and deactivation of the switch. Furthermore, the provided power tool has conditions for actuating the switch when the trigger element moves relative to the elongated handle in several directions. In this way, the provided power tool allows the user to grip the elongated handle in multiple gripping directions in a simple and efficient manner during operation of the power tool.

[0015] Optionally, the second mechanism component is configured to pivot about the first pivot axis. Thus, the provided power tool has the capability to reliably and consistently actuate and deactivate the switch in a simple and efficient manner.

[0016] Optionally, the second mechanism member is configured to pivot about a second pivot axis transverse to the first pivot axis. Thus, the provided power tool has conditions for consistent and reliable actuation and deactivation of the switch. Furthermore, the provided power tool has conditions for actuating the switch when the trigger element moves relative to the elongated handle in several directions. In this way, the provided power tool allows the user to grip the elongated handle in multiple gripping directions in a simple and efficient manner during operation of the power tool.

[0017] Optionally, the trigger element includes an orifice, and the second mechanism member includes a knob extending into the orifice. This provides a simple, efficient, and reliable motion transmission between the trigger element and the second mechanism member. Furthermore, the provided power tool is designed to actuate a switch when the trigger element moves relative to the elongated handle in several directions. In this way, the provided power tool allows the user to grip the elongated handle in multiple gripping directions in a simple and efficient manner during operation of the power tool.

[0018] Optionally, the second mechanism member includes a recess, and wherein the second mechanism member is movable to a position in which a section of the first mechanism member extends into the recess. Thus, the provided power tool has the capability to achieve consistent and reliable actuation and deactivation of the switch in a simple, reliable, and cost-effective manner.

[0019] Optionally, when a section of the first mechanism component moves out of the recess, the first mechanism component moves in the direction toward the switch. Thus, the provided power tool has the capability to consistently and reliably actuate and deactivate the switch in a simple, reliable, and cost-effective manner.

[0020] Optionally, the second mechanism member includes an abutment surface adjacent to the recess, and wherein the second mechanism member is configured to move the first mechanism member in the direction toward the switch through abutment contact between the abutment surface and the first mechanism member. Thus, the provided power tool has the capability to consistently and reliably actuate and deactivate the switch in a simple, reliable, and cost-effective manner. Furthermore, the provided power tool has the capability for different trigger points for the trigger element, at which the position of the trigger element relative to the elongated handle causes actuation of the switch. Additionally, due to these features, the trigger element can be allowed to move beyond the trigger points mentioned above. In this way, a more user-friendly power tool can be provided, as the switch can be actuated quickly and efficiently simply by gripping the elongated handle, and accidental deactivation of the switch, for example, caused by the release of the elongated handle, can be avoided.

[0021] Optionally, the adjacent surfaces are curved and / or bowl-shaped. Thus, the provided power tool has conditions for different trigger points for the trigger element, at which the position of the trigger element relative to the elongated handle causes actuation of the switch. Furthermore, due to these features, the trigger element can be allowed to move beyond the trigger points mentioned above. In this way, a more user-friendly power tool can be provided, as the switch can be actuated quickly and efficiently simply by gripping the elongated handle, and accidental deactivation of the switch, for example, caused by the release of the elongated handle, can be avoided.

[0022] Optionally, the adjacent surface surrounds the recess. Thus, the provided power tool has conditions for different trigger points for the trigger element, at which the position of the trigger element relative to the elongated handle causes actuation of the switch. Furthermore, due to these features, the trigger element can be allowed to move beyond the trigger points mentioned above. In this way, a more user-friendly power tool can be provided, because the switch can be actuated quickly and efficiently simply by gripping the elongated handle, and accidental deactivation of the switch, such as due to the release of the elongated handle, can be avoided. Moreover, the provided power tool has conditions for actuating the switch when the trigger element moves relative to the elongated handle in several directions. In this way, the provided power tool allows the user to grip the elongated handle in multiple gripping directions in a simple and efficient manner during operation of the power tool.

[0023] Optionally, the power tool includes an elastic member that biases the first mechanism member in a direction toward the second mechanism member. Thus, the provided power tool provides conditions for consistent and reliable actuation and deactivation of the switch in a simple, reliable, and cost-effective manner. Furthermore, because the first mechanism member is biased in a direction toward the second mechanism member, a more noticeable and reliable deactivation of the switch can be achieved when the user releases the slender handle.

[0024] Optionally, the first mechanism component is spherical or ellipsoidal. Thus, the provided power tool has the capability to achieve consistent and reliable actuation and deactivation of the switch in a simple, reliable, and cost-effective manner.

[0025] Optionally, the mechanism is mounted on the power tool body. This provides protection for the mechanism against dust, debris, water, impact, vibration, and other harmful substances. In this way, a more robust and reliable power tool can be provided. Furthermore, because the mechanism is located on the power tool body, a more compact power tool is possible, making it easier to use.

[0026] Optionally, the elongated handle includes a gripping portion for human handling, and wherein the triggering element has an actuating portion that protrudes from the gripping portion of the elongated handle. Thus, more reliable and accurate actuation and deactivation of the switch can be provided when the user grips the elongated handle and when the user releases the elongated handle.

[0027] Optionally, the gripping portion of the elongated handle is bent to at least partially enclose a region, wherein the actuating portion protrudes from a slot extending on the gripping portion of the elongated handle and faces that region. Thus, the provided power tool has the condition to actuate a switch when the trigger element moves relative to the elongated handle in multiple directions. In this way, the provided power tool allows the user to grip the elongated handle in multiple gripping directions in a simple and efficient manner during operation of the power tool.

[0028] Optionally, the triggering element is a continuous, integral unit. Thus, the provided triggering element possesses the characteristics and properties that make it suitable for cost-effective manufacturing and assembly while being resistant to breakage.

[0029] Optionally, the switch can be set to a first state in which the power tool is in a non-operating state, or the switch can be set to a second state in which the power tool is in an operating state. Such a switch (e.g., a mechanically actuated microswitch) is fail-safe, compact, and available at low cost.

[0030] Optionally, the power tool includes a main handle having a main trigger for controlling the speed of the power source. Thus, the switch can be a safety switch connected to the main trigger such that the main trigger is unavailable when the safety switch is in a first state and available when the safety switch is in a second state.

[0031] Optionally, the power tool includes mating guide surfaces for guiding the movement of the trigger element relative to the handle. Thus, the provided power tool provides a simple, reliable, and cost-effective way to consistently and reliably actuate and deactivate the switch.

[0032] Optionally, the mating guide surfaces include an orifice and a guide pin extending into the orifice. Thus, the provided power tool provides the means to consistently and reliably actuate and deactivate the switch in a simple, reliable, and cost-effective manner.

[0033] Alternatively, the power tool may be a hedge trimmer, a line trimmer, or a shrub cutter.

[0034] Other features and advantages of the invention will become apparent when examined in light of the appended claims and the following detailed description. Attached Figure Description

[0035] Many aspects of the present invention, including its specific features and advantages, will be readily understood through the exemplary embodiments and accompanying drawings discussed in the following detailed description, in which:

[0036] Figure 1 A perspective view of a handheld power tool according to some embodiments is shown.

[0037] Figure 2 It shows Figure 1 A partial view of a portion of the power tool shown.

[0038] Figure 3 It shows Figure 1 and Figure 2 Partial view of some components of the power tool shown.

[0039] Figure 4 It shows Figure 3 A partial view of the component shown, in Figure 4 In the middle, the trigger element has been moved to the actuated position relative to the slender handle of the power tool.

[0040] Figure 5 It shows according to Figures 1 to 4 A perspective view of the switching assembly of the power tool according to the embodiment shown.

[0041] Figure 6 It shows Figure 5 The cross-section of the switch assembly shown.

[0042] Figure 7 It shows Figure 6 The cross-section of the switch assembly shown is in Figure 7 In the middle, the second mechanism component has been pivoted to the actuation position.

[0043] Figure 8 It shows according to Figures 1 to 4 A cross-sectional view of the elongated handle of the power tool in the embodiment shown, and

[0044] Figure 9 It shows Figure 8 The cross-sectional view of the slender handle shown in the figure. Figure 9 In the middle, the trigger element has been moved to the actuation position. Detailed Implementation

[0045] Various aspects of the invention will now be described more fully. Throughout the text, the same reference numerals refer to the same elements. For the sake of brevity and / or clarity, well-known functions or constructions will not be described in detail.

[0046] Figure 1 A perspective view of a handheld power tool 1 according to some embodiments is shown. According to the illustrated embodiment, the handheld power tool 1 is a hedge trimmer. According to other embodiments, as mentioned herein, the handheld power tool 1 is another type of handheld power tool, such as a wire trimmer, bush cutter, power cutter, chainsaw, circular saw, multi-tool, etc.

[0047] The term "handheld power tool 1" refers to a power tool 1 configured to be supported by one or both of the user's hands during operation. According to the illustrated embodiment, the handheld power tool 1 is configured to be supported by both of the user's hands during operation, as will be further explained herein. For the sake of brevity and clarity, the handheld power tool 1 is referred to as "power tool 1" in some places herein.

[0048] The power tool 1 includes a power tool body 3, a tool 2, and a power source configured to provide power to the tool 2. The power tool body 3 houses various components and systems of the power tool 1, such as the power source, as will be further explained herein. The power tool body 3 may also include several other components, which... Figure 1 These components are not visible in the power tool, but are typically located within the power tool and therefore do not require detailed description herein. These components include, but are not limited to, a gearbox, an accessory for attaching tool 2 to power tool 1, electrical wiring circuitry, an electronic controller for controlling the operation of power tool 1 and external buttons, levers, and various controls. In the illustrated alternative, tool 2 is a serrated blade for cutting hedge branches, i.e., a reciprocating cutting tool.

[0049] The power tool 1 includes an elongated handle 20 held by a person using the power tool 1. Furthermore, the power tool 1 includes a main handle 5, which has a main trigger 6 for controlling the speed and operation of the power source of the power tool 1. Thus, according to the illustrated embodiment, the handheld power tool 1 is configured to be supported by both of the user's hands during operation, i.e., one hand grips the elongated handle 20 and the other hand grips the main handle 5.

[0050] According to the illustrated embodiment, the elongated handle 20 can be referred to as the front auxiliary handle, and the main handle 5 can be referred to as the rear main handle. Figure 1 As shown, the elongated handle 20 is slender and bent into a curved shape, and is attached to the power tool body 3 such that the elongated handle forms a continuous rounded rectangular shape and surrounds a region. In operation, the elongated handle 20 can be gripped by the user of the power tool 1 at virtually any position along its length. For example, the user of the power tool can grip the elongated handle 20 in a first lateral region, or in a middle region, or in a second lateral region. In this way, the user is allowed to operate the power tool 1 in various orientations, as will be further explained herein.

[0051] Figure 2 It shows Figure 1 A cross-sectional view of a portion of the power tool 1 shown. Figure 2 In the middle, for reasons of visibility and clarity, some parts of power tool 1 have been removed. Figure 2 In the image, a portion of the power tool body 3 of power tool 1 and a portion of tool 2 can be seen. Furthermore, in... Figure 2 The power source 4 of the power tool 1 can be seen. According to the illustrated embodiment, the power source 4 is an electric motor powered by a battery. Figure 1 The image shows the battery 40 of the power tool 1. According to other embodiments, power can be supplied to the power source 4 via another type of device (such as a power cord). Furthermore, according to other embodiments, as mentioned herein, the power source 4 can be another type of power source besides an electric motor, such as an internal combustion engine, a pneumatic motor, etc.

[0052] In addition, Figure 2 In the image, a portion of the slender handle 20 can be seen. Figure 2 As can be seen, the elongated handle 20 includes a trigger element 30 extending along at least a portion of the elongated handle 20. The trigger element 30 is configured to be movable relative to the elongated handle 20 such that the trigger element 30 moves relative to the elongated handle 20 when a person grips the elongated handle 20, as will be explained further herein.

[0053] In addition, Figure 2 In the diagram, the switch 10 and mechanism 7 of the power tool 1 can be seen. As will be explained further herein, the switch 10 is operatively connected to the trigger element 30 via the mechanism 7. In other words, the mechanism 7 operatively connects the trigger element 30 and the switch 10. The switch 10 is configured to set the power tool 1 to an operating or non-operating state based on the position of the trigger element 30. Figure 2 As seen in the image, switch 10 is located on the power tool body 3.

[0054] Figure 3 It shows Figure 1 and Figure 2 Cross-sectional views of some components of the power tool 1 shown. Figure 3 In the image, a handle assembly 20' and a switch assembly 10' of the power tool can be seen. The handle assembly 20' includes an elongated handle 20, and the switch assembly 10' includes a switch 10. The switch assembly 10' and the handle assembly 20' are configured to be mounted to... Figure 1 and Figure 2 The power tool body 3 of the power tool 1 is shown in the figure. The switch assembly 10' and the handle assembly 20' can be rigidly attached to the power tool body 3 of the power tool 1. In the following text, unless otherwise stated, reference is also made to... Figures 1 to 3 .

[0055] The switch assembly 10' includes a protrusion 46, and the handle assembly 20' includes a recess 48. The protrusion 46 is formed as a guide pin and configured to extend into the recess 48 of the handle assembly 20' when the switch assembly 10' and the handle assembly 20' are in the assembled state, such as... Figure 3 As shown. The protrusions 46 and recesses 48 facilitate the assembly and alignment of the switch assembly 10' and the handle assembly 20'. According to the illustrated embodiment, the switch assembly 10' includes two protrusions 46, and the handle assembly 20' includes two recesses 48. However, in Figure 3 In this embodiment, only one of the protrusions 46 and only one of the recesses 48 are visible. According to other embodiments, the switch assembly 10' may include one or more recesses, and the handle assembly 20' may include one or more protrusions configured to extend into the recesses of the switch assembly 10' when the switch assembly 10' and the handle assembly 20' are in an assembled state.

[0056] The elongated handle 20 includes a gripping portion 21 for human handling. A trigger element 30 has an actuating portion 31 protruding from the gripping portion 21 of the elongated handle 20. The gripping portion 21 of the elongated handle 20 is bent to at least partially enclose a region A. The actuating portion 31 protrudes from a slot 22 extending on the gripping portion 21 of the elongated handle 20 and faces region A. The trigger element 30 is movably disposed within the slot 22. Figure 3 In the diagram, trigger element 30 is shown in a non-actuated position. As will be explained further herein, trigger element 30 is configured to be in a non-actuated position when not subjected to external forces (such as the gripping force of a user's hand).

[0057] In addition, Figure 3In the diagram, the second mechanism member 12 of mechanism 7 can be seen. The second mechanism member 12 of mechanism 7 is operatively connected to the trigger element 30 and configured to move when the trigger element 30 moves. According to the illustrated embodiment, the trigger element 30 includes an orifice 37, and the second mechanism member 12 includes a protrusion 16 extending into the orifice 37 of the trigger element 30. In this way, the second mechanism member 12 is operatively connected to the trigger element 30. According to other embodiments, the second mechanism member 12 of mechanism 7 may be operatively connected to the trigger element 30 in another manner. As an example, the second mechanism member 12 may include an orifice, and the trigger element 30 may include a protrusion extending into the orifice of the second mechanism member 12 of mechanism 7.

[0058] Figure 4 It shows Figure 3 The cross-sectional view of the component shown is in Figure 4 In the middle, the trigger element 30 has been moved to the actuated position relative to the elongated handle 20. Figure 4 In the diagram, the trigger element 30 is shown in a position corresponding to the central portion p0 of the gripping portion 21 of the elongated handle 20 held by the user. (Refer to the following text.) Figure 8 and Figure 9 Further explanation is given regarding the mobility of the different parts p0 of the gripping portion 21 of the elongated handle 20 and the trigger element 30 relative to the elongated handle 20.

[0059] As in Figure 4 As can be seen, the second mechanism component 12 of mechanism 7 moves as the trigger element 30 moves to the actuation position.

[0060] According to the illustrated embodiment, the second mechanism member 12 is configured to pivot relative to the switch assembly 10' about a first pivot axis ax1 and about a second pivot axis ax2, wherein the second pivot axis ax2 is transverse to the first pivot axis ax1. As will be further explained herein, according to the illustrated embodiment, the second pivot axis ax2 is perpendicular to the first pivot axis ax1. Furthermore, the second pivot axis ax2 extends through the first pivot axis ax1.

[0061] According to other embodiments, the second mechanism member 12 may be configured to be movable relative to the switch assembly 10' in another manner (such as about a pivot axis ax1, ax2). While the second mechanism member 12 of the mechanism 7 and the trigger element 30 of the elongated handle 20 can be moved to different actuation positions, they will be referred to below as... Figure 4 The position of the second mechanism component 12 of the mechanism 7 shown is called the actuation position, as explained further below.

[0062] Figure 5 It shows according to Figures 1 to 4A perspective view of the switch assembly 10' of the power tool 1 in the embodiment shown. Figure 5 In the diagram, the second mechanism component 12 of mechanism 7 is shown in a non-actuated position. (As in...) Figure 5 As clearly seen, the convex portion 16 of the second mechanism member 12 has a curved convex shape. Furthermore, according to the illustrated embodiment, the aperture 37 of the trigger element 30 (in...) Figure 4 and Figure 5 (As shown in the figure) It has a matching curved concave shape. In this way, the engagement between the protrusion 16 and the orifice 37 allows the second mechanism member 12 to be angularly displaced relative to the orifice 37 of the trigger element 30 in a simple, reliable and efficient manner.

[0063] Figure 6 It shows Figure 5 The cross-section of the switch assembly 10' shown is illustrated. Figure 6 In this case, the cross-section is taken on a plane including the second pivot axis ax2 of the second mechanism member 12. Furthermore, in Figure 6 In this case, the cross-section is taken on a plane perpendicular to the first pivot axis ax1 of the second mechanism member 12. Figure 6 In the diagram, the second mechanism component 12 of mechanism 7 is shown in the non-actuated position.

[0064] As in Figure 6 As can be seen, mechanism 7 includes a first mechanism member 11. As will be further explained herein, mechanism 7 is configured such that the first mechanism member 11 of mechanism 7 moves in a direction d1 toward switch 10 when the elongated handle 20 is gripped. According to the illustrated embodiment, a second mechanism member 12 is in abutment contact with the first mechanism member 11. Thus, according to the illustrated embodiment, the second mechanism member 12 is connected to the trigger element 30 (e.g., by contacting both the trigger element 30 and the first mechanism member 11) in abutment contact. Figure 4 (as shown in the diagram) and connected to the first mechanism component 11.

[0065] More specifically, according to the illustrated embodiment, the second mechanism member 12 includes a recess 14. As in Figure 6 As can be seen, when the second mechanism member 12 is in the non-actuated position, the segment 11' of the first mechanism member 11 extends into the recess 14. Thus, the second mechanism member 12 can be moved to a position where the segment 11' of the first mechanism member 11 extends into the recess 14. According to the illustrated embodiment, the first mechanism member 11 is spherical. According to other embodiments, the first mechanism member 11 can have different forms or shapes, such as curved, elliptical, etc.

[0066] Furthermore, according to the illustrated embodiment, mechanism 7 includes an elastic member 17 that biases the first mechanism member 11 in a direction d2 toward the second mechanism member 12. In this way, abutment contact between the first mechanism member 11 and the second mechanism member 12 can be ensured regardless of the pivot position of the second mechanism member 12 relative to the switching assembly 10'. The elastic member 17 may include a spring, such as a coil spring. Alternatively, the elastic member 17 may include another type of elastic element.

[0067] In addition, such as Figure 6 As shown, the second mechanism member 12 includes an abutment surface 15 adjacent to the recess 14. According to the illustrated embodiment, the abutment surface 15 surrounds the recess 14. The second mechanism member 12 is configured to move the first mechanism member 11 in a direction d1 toward the switch 10 through abutment contact between the abutment surface 15 and the first mechanism member 11. In other words, the first mechanism member 11 is configured to move relative to the switch 10 when the second mechanism member 12 moves.

[0068] Figure 7 It shows Figure 6 The cross-section of the switch assembly 10' shown is in Figure 7 In the middle, the second mechanism component 12 has been pivoted to the actuated position. For example, in... Figure 7 As can be seen, when the second mechanism member 12 pivots to the actuated position, the first mechanism member 11 moves in the direction d1 toward the switch 10 through the abutment contact between the adjacent surfaces 15 of the first mechanism member 11 and the second mechanism member 12. Furthermore, as in... Figure 7 As can be seen in the illustration, according to the embodiment shown, when the second mechanism member 12 pivots to the actuated position, the segment 11' of the first mechanism member 11 moves out of the recess 14.

[0069] The first mechanism 11 is configured to actuate the switch 10 by pressing against it when displaced in the direction d1 toward the switch 10. The switch 10 can be a mechanically actuated microswitch that closes the circuit when actuated by pressure from the first mechanism 11 and opens the circuit when the pressure is removed. In this way, the switch 10 can be actuated in a simple, reliable, and efficient manner. Furthermore, due to these features of the mechanism 7, a mechanically actuated microswitch that is fail-safe, compact, and available at low cost can be used.

[0070] As understood from the description herein, mechanism 7 is configured such that the first mechanism member 11 moves relative to the switch 10 during the pivoting movement of the second mechanism member 12. According to the illustrated embodiment, the abutment surface 15 is bowl-shaped and has a radius of curvature substantially equal to the distance between the points where the abutment surface 15 intersects the first pivot axis ax1 and the second pivot axis ax2. In other words, according to the illustrated embodiment, mechanism 7 is configured such that the distances from the points where the first pivot axis ax1 and the second pivot axis ax2 intersect to different portions of the abutment surface 15 are substantially equal across the entire abutment surface 15. Thus, due to these features, the switch can be actuated prior to the second mechanism member 12, allowing it to move beyond the trigger point (i.e., the point where the second mechanism member 12 triggers the actuation of the switch 10). In this way, a more user-friendly power tool can be provided. Furthermore, due to these features of mechanism 7, the provided switch assembly 10' has the conditions for efficient operation in various types of power tools, as will be further explained herein.

[0071] When the second mechanism component 12 pivots to the non-actuated position, such as Figure 6 As shown, the first mechanism member 11 moves in a direction d2 away from the switch 10 due to the biasing force of the elastic member 17, causing a segment 11' of the first mechanism member 11 to extend into the recess 14 of the second mechanism member 12. Thus, when the first mechanism member 11 moves in the direction d2 away from the switch 10, the switch 10 is deactivated. In this way, the switch 10 is deactivated in a simple, reliable, and efficient manner. As understood from the description herein, according to the illustrated embodiment, the direction d2 away from the switch 10 is, in this context, the same direction as the direction d2 toward the second mechanism member 12.

[0072] Figure 8 It shows that according to Figures 1 to 4 A cross-sectional view of the elongated handle 20 of the power tool 1 in the embodiment shown. Figure 8 In the middle, for visibility reasons, one housing component of the slender handle 20 has been removed. (As in...) Figure 8 As can be seen, the trigger element 30 is a continuous monolith, meaning it is made from a single piece of material. The trigger element 30 can be made, for example, from a polymer material. Due to these characteristics, the provided trigger element 30 possesses the conditions and properties suitable for cost-effective manufacturing and assembly while being durable.

[0073] As explained above, the trigger element 30 has an actuating portion 31 protruding from the gripping portion 21 of the elongated handle 20. The gripping portion 21 of the elongated handle 20 is bent to form a region A. The actuating portion 31 protrudes from a slot 22 extending on the gripping portion 21 of the elongated handle 20. The actuating portion 31 faces region A, and the trigger element 30 is movably disposed in the slot 22. The slot 22 points inward toward region A enclosed by the elongated handle 20. The trigger element 30 is disposed within the elongated handle 20. The trigger element 30 may be designed such that its shape corresponds to the shape of the elongated handle 20. The actuating portion 31 of the trigger element 30 extends through the slot 22 in the elongated handle 20 into region A. When a person grips the gripping portion 21 of the elongated handle 20, they simultaneously grip the actuating portion 31. The trigger element 30 can move within the elongated handle 20, and thus the trigger element 30 can move within the elongated handle 20 when the actuating part 31 is gripped.

[0074] exist Figure 3 In the illustration, the trigger element 30 is shown in a non-actuated position. According to the illustrated embodiment, the non-actuated position can also be referred to as the centered position because when the trigger element 30 is in the non-actuated position, it is aligned with the axis of symmetry of the elongated handle 20. As will be further explained herein, the trigger element 30 is configured to be in the non-actuated position when not subjected to external forces (such as the gripping force of a user's hand). According to the illustrated embodiment, the power tool 1 includes a resilient member 38 configured to bias the trigger element 30 toward the non-actuated position. Reference will be made below. Figure 9 The characteristics and functions of the elastic member 38 will be further explained.

[0075] As in Figure 8 As can be seen, because the gripping portion 21 of the elongated handle 20 is bent to form area A, the user can grip each part p0, p1, and p2 of the gripping portion 21 of the elongated handle 20. This allows the user to operate the power tool 1 in various orientations. In the following text, part p0 of the gripping portion 21 of the elongated handle 20 is referred to as the central part p0, part p1 of the gripping portion 21 of the elongated handle 20 is referred to as the first side part p1, and part p2 of the gripping portion 21 of the elongated handle 20 is referred to as the second side part p2. The central part p0 of the gripping portion 21 of the elongated handle 20 can also be referred to as the middle region of the gripping portion 21. The first side part p1 of the gripping portion 21 of the elongated handle 20 can also be referred to as the first lateral region of the gripping portion 21. The second side part p2 of the gripping portion 21 of the elongated handle 20 can also be referred to as the second lateral region of the gripping portion 21.

[0076] Figure 9 It shows Figure 8 The cross-sectional view of the slender handle 20 shown in the figure. Figure 9In the middle, the trigger element 30 has been moved to the actuated position. Figure 9 In the diagram, the trigger element 30 is shown in an actuated position corresponding to the first side portion p1 of the gripping portion 21 of the elongated handle 20 held by the user. Unless otherwise stated below, reference will also be made to... Figures 1 to 9 When comparing Figure 8 and Figure 9 It can be seen that, Figure 9 In this process, the trigger element 30 has already moved in the direction toward the first side portion p1. Due to the relative movement of the orifice 37 of the trigger element 30 and the elongated handle 20, the trigger element 30 causes the second mechanism member 12 to move to a position where the first mechanism member 11 presses against the switch 10. Therefore, due to the relative movement of the trigger element 30 and the elongated handle 20, the switch 10 is actuated when the user grasps portions p0, p1, and p2 of the gripping portion 21 of the elongated handle 20.

[0077] As in Figure 8 and Figure 9 As can be seen, the power tool 1 includes mating guide surfaces 35, 35', 35”, 41, 41', 41” for guiding the movement of the trigger element 30 relative to the elongated handle 20. More specifically, according to the illustrated embodiment, these mating guide surfaces 35, 35', 35”, 41, 41', 41” include a plurality of orifices 41, 41', 41” and a plurality of guide pins 35, 35', 35”, wherein each guide pin 35, 35', 35” extends into one of the plurality of orifices 41, 41', 41”. According to the illustrated embodiment, the elongated handle 20 includes orifices 41, 41', 41”, and the trigger element 30 includes guide pins 35, 35', 35”. According to other embodiments, the trigger element 30 may include a plurality of orifices, and the elongated handle 20 may include a plurality of guide pins, each guide pin extending into one of the plurality of orifices of the trigger element 30.

[0078] As in Figure 8 and Figure 9 As can be seen, according to the illustrated embodiment, the orifices 41, 41', and 41" have a substantially triangular shape. Due to the shape of the orifices 41, 41', and 41" according to the illustrated embodiment, the trigger element 30... Figure 8 and Figure 9 The force acting on the center is upward, specifically towards the central portion p0 of the gripping part 21, and the same applies when one of the first side portion p1 and the second side portion p2 is gripped. Therefore, as understood from the above, and when comparing... Figure 8 and Figure 9As can be seen, when the first side portion p1 is grasped, the trigger element 30 moves simultaneously toward the first side portion p1 and the central portion p0 due to the mutual cooperation of the guide surfaces 35, 35', 35”, 41, 41', 41”.

[0079] When the central portion p0 is gripped, the abutment contact between the guide pins 35, 35', 35” and the orifices 41, 41', 41” is released, and the guide pins 35, 35', 35” move to their respective positions within the orifices 41, 41', 41”. Due to the mating guide surfaces 35, 35', 35”, 41, 41', 41”, when different portions p0, p1, p2 of the gripping portion 21 of the elongated handle 20 are gripped, the trigger element 30 moves within the elongated handle 20 in a predetermined manner. Furthermore, the mating guide surfaces 35, 35', 35”, 41, 41', 41” restrict the relative movement between the trigger element 30 and the elongated handle 20.

[0080] As mentioned above, the power tool 1 includes a resilient member 38 configured to bias the trigger element 30 toward a non-actuated position. According to the illustrated embodiment, the resilient member 38 is configured to... Figure 8 and Figure 9 The trigger element 30 is biased downward relative to the elongated handle 20, specifically in the direction away from the central portion p0 of the gripping portion 21 of the elongated handle 20. Furthermore, due to the shape of the orifices 41, 41', 41" according to the illustrated embodiment, the trigger element 30 is subjected to a downward bias relative to the elongated handle 20 regardless of its direction of movement from its non-actuated position. Figure 8 and Figure 9 The force is directed upwards, specifically towards the central portion p0 of the gripping part 21. In this way, when the trigger element 30 moves relative to the elongated handle 20 from the non-actuated position, the elastic member 38 is compressed regardless of the direction of movement from the non-actuated position. This is comparable to... Figure 8 and Figure 9 This can also be seen at times. Due to these features, simple and accurate control of the movement of the trigger element 30 is provided. According to the embodiment shown, the elastic member 38 is a torsion spring attached to the elongated handle 20, wherein the elastic member 38 includes an arm 38' that abuts against a portion of the trigger element 30.

[0081] According to other embodiments, the power tool 1 may include a leaf spring configured to bias the trigger element 30 toward a non-actuated position. Such a leaf spring may, for example, be in… Figure 8The mounting points 39, 39' shown are attached to the elongated handle 20, wherein the leaf spring may include a central portion adjacent to and abutting the trigger element 30 to bias the trigger element 30 toward the non-actuated position. Alternatively, or additionally, the power tool 1 may include one or more other types of resilient elements, such as one or more coil springs, elastic elements, etc., for biasing the trigger element 30 toward the non-actuated position.

[0082] Due to these features of mechanism 7 and the fact that the second mechanism member 12 is configured to pivot relative to the switch assembly 10' about a first pivot axis ax1 and a second pivot axis ax2 transverse to the first pivot axis ax1, the second mechanism member 12 can rotate 360 ​​degrees. Furthermore, as in Figure 5 As can be seen from the best view, the function and attachment of the second mechanism component 12 and the switch assembly 10' are similar to those of a universal joint, except that a universal joint is typically configured to transmit torque, for example, in power transmission.

[0083] In addition, as mentioned above Figure 6 and Figure 7 As explained, due to these features of mechanism 7, the switch 10 can be actuated first when the trigger element 30 moves relative to the elongated handle 20. Furthermore, due to these features of mechanism 7, the trigger element 30 can move beyond the position where the switch 10 is actuated. In this way, a more user-friendly power tool 1 can be configured to provide better tactile feedback and comfort when gripping the elongated handle 20.

[0084] Furthermore, due to these features of mechanism 7, the switch assembly 10' can be used in various types of power tools without further modifications or with at least fewer modifications, which reduces the manufacturing cost, R&D cost, and assembly cost of power tools.

[0085] According to the embodiments described herein, switch 10 can be set to a first state in which the power tool 1 is set to a non-operating state; or switch 10 can be set to a second state in which the power tool 1 is set to an operating state. Switch 10 can be a safety switch connected to the main trigger 6, such that the main trigger 6 is unavailable when switch 10 is in the first state, and is available when switch 10 is in the second state.

[0086] Therefore, the switch 10 of the power tool 1 can be configured to set the power tool 1 to an operating state or a non-operating state. "Operating state" means that the tool 2 attached to the power tool 1 can be set to be in motion. "Non-operating state" means that the tool 2 can be set to be in a non-operating state. Thus, when the power tool 1 is in the "operating state," the power source 4, the main trigger 6, and other components related to the movement of the tool are available. When the power tool 1 is in the "non-operating state," none of the power source 4, the main trigger 6, or other components related to the movement of the tool 2 are available.

[0087] Switch 10 can typically be set to either a first state or a second state. Thus, switch 10 and power tool 1 are configured such that when switch 10 is in the first state, power tool 1 is in a non-operating state, and when switch 10 is in the second state, power tool 1 is in an operating state. To achieve this, switch 10 can be electrically or mechanically connected to all or any one of the power source 4, the main trigger 6, or any other related components of power tool 1. This configuration is within the knowledge of those skilled in the art and may not require further description herein.

[0088] According to one alternative, switch 10 can be connected to power source 4 such that power source 4 is on when switch 10 is in the second state, and off when switch 10 is in the first state. According to a second alternative, switch 10 is connected to master trigger 6 such that master trigger 6 is available when switch 10 is in the second state, and unavailable (e.g., locked) when switch 10 is in the first state. These two alternatives can be combined.

[0089] Typically, the power tool 1 can be configured to activate when the gripping portion 21 of the elongated handle 20 is gripped and the main trigger 6 of the rear handle 5 is pressed.

[0090] The switch 10 may be a mechanically actuated miniature switch that closes the circuit when the switch 10 is actuated by the pressure of the first mechanism member 11 (i.e., the second state) and opens the circuit when the pressure of the first mechanism member 11 is removed (i.e., the first state).

[0091] Any reference to direction or position (such as "above" or "below" or "upper" or "lower" or "upward" or "downward") used herein refers to a handheld power tool held parallel to the ground (such as horizontally). In this case, the central portion of the handle may be orthogonally (such as vertically) oriented away from the ground.

[0092] It should be understood that the foregoing is a description of several exemplary embodiments, and the invention is defined only by the appended independent claims. Those skilled in the art will recognize that variations can be made to the exemplary embodiments without departing from the scope of the invention as defined by the appended claims, and different features of the exemplary embodiments can be combined to produce embodiments other than those described herein.

[0093] As used herein, the terms “comprising” or “including” are open-ended and include one or more of the stated features, elements, steps, components, or functions, but do not exclude the presence or addition of one or more other features, elements, steps, components, functions, or combinations thereof.

Claims

1. A handheld power tool (1), comprising: Power tool body (3) Tools (2), Power source (4), configured to provide power to the tool (2), Switch (10), configured to set the power tool (1) to an operating state or a non-operating state, and The long handle (20) is held by a person using the power tool (1), and the gripping portion (21) of the long handle (20) is bent to at least partially enclose an area (A). The elongated handle (20) includes an integral trigger element (30) that extends along the entire length of the elongated handle (20) and is configured to be movable relative to the elongated handle (20) such that the trigger element (30) moves relative to the handle (20) when a person grips the handle (20). The switch (10) is located on the power tool body (3), and The power tool (1) includes a mechanism (7) operably connected to the trigger element (30), and The mechanism (7) includes a first mechanism member (11) and a second mechanism member (12), the second mechanism member being connected to the trigger element (30) and the first mechanism member (11). The mechanism (7) is configured such that when the handle (20) is gripped, causing the trigger element (30) to move and consequently the second mechanism member (12), the first mechanism member (11) of the mechanism (7) moves in a direction (d1) toward the switch (10). The second mechanism member (12) includes a recess (14), and the second mechanism member (12) is movable to a position in which a segment (11') of the first mechanism member (11) extends into the recess (14). When the section (11') of the first mechanism member (11) moves out of the recess (14), the first mechanism member (11) moves in the direction (d1) toward the switch (10), and The second mechanism member (12) includes an adjacent surface (15) adjacent to and surrounding the recess (14), and the second mechanism member (12) is configured to move the first mechanism member (11) in a direction (d1) toward the switch (10) by means of an adjacent contact between the adjacent surface (15) and the first mechanism member (11).

2. The power tool (1) according to claim 1, wherein, The mechanism (7) is configured such that the first mechanism member (11) moves relative to the switch (10) when the second mechanism member (12) pivots.

3. The power tool (1) according to claim 1, wherein, The second mechanism component (12) is configured to pivot about the first pivot axis (ax1).

4. The power tool (1) according to claim 3, wherein, The second mechanism component (12) is configured to pivot about a second pivot axis (ax2) that is transverse to the first pivot axis (ax1).

5. The power tool (1) according to claim 1, wherein, The triggering element (30) includes an aperture (37), and wherein the second mechanism member (12) includes a protrusion (16) extending into the aperture (37).

6. The power tool (1) according to claim 1, wherein, The adjacent surface (15) is curved and / or bowl-shaped.

7. The power tool (1) according to claim 1, wherein, The power tool (1) includes an elastic member (17) that biases the first mechanism member (11) in a direction (d2) toward the second mechanism member (12).

8. The power tool (1) according to claim 1, wherein, The first mechanism component (11) is spherical or ellipsoidal.

9. The power tool (1) according to claim 1, wherein, The mechanism (7) is mounted on the power tool body (3).

10. The power tool (1) according to claim 1, wherein, The trigger element (30) has an actuation portion (31) that protrudes from the gripping portion (21) of the elongated handle (20).

11. The power tool (1) according to claim 10, wherein, The actuating portion (31) protrudes from a slot (22) extending on the gripping portion (21) of the elongated handle (20) and faces the area (A).

12. The power tool (1) according to claim 1, wherein, The power tool (1) includes mutually cooperating guide surfaces (35, 35', 35'', 41, 41', 41'') for guiding the movement of the trigger element (30) relative to the elongated handle (20).

13. The power tool (1) according to claim 12, wherein, The mutually cooperating guide surfaces (35, 35', 35'', 41, 41', 41'') include an aperture (41, 41', 41'') and a guide pin (35, 35', 35'') extending into the aperture (41, 41', 41'').

14. The power tool (1) according to any one of claims 1 to 13, wherein, The power tool (1) is a hedge trimmer, a line trimmer, or a shrub cutter.

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