Flexible power tool with backpack mount

Abstract

A backpack-mounted power tool is described. The power tool comprises a frame with a backplate that includes an upper and lower end and defines a backplate plane, and a tool body coupled to the frame via a coupling device. The coupling device includes a coupling element configured to allow movement of the tool body back and forth in a lateral direction relative to the backplate plane. The tool body includes a user interface configured to be gripped by a user to hold the tool body and control its movement.

Description

Cross-reference to related registrations

[0001] The present application claims priority over the preliminary US patent application with serial number 63 / 675,500, filed on July 25, 2024, the preliminary US patent application with serial number 63 / 708,086, filed on October 16, 2024, and the preliminary US patent application with serial number 63 / 739,993, filed on December 30, 2024, the disclosures of each of these applications being incorporated herein by reference in their entirety. Area

[0002] The present disclosure relates essentially to backpack-carried power tools. background

[0003] Portable hand-held blowers are widely used for tasks such as home maintenance and commercial landscaping. Typical hand-held blowers are powered by either gasoline engines or electric motors. A fan is connected to the engine and rotates within a blower housing. The fan generates an airflow that is directed to an outlet on the housing. An extension tube is essentially connected to the housing outlet to carry the airflow out of the housing, where it is subsequently expelled either from the tube or through a nozzle connected to the tube.

[0004] Electrically powered blowers can be operated with portable batteries. However, there can be trade-offs between the weight of each battery and the efficiency and performance of the blower—for example, improved efficiency and performance through higher-voltage batteries can increase the overall weight of the blower. The increased weight and size of the battery and / or blower can also reduce operational flexibility. Some existing outdoor power tools can use a backpack mount to attach the power supply for a portable blower.However, the connection between the backpack mount and the handheld blower can further limit the flexibility and ease of use of the blower, including limiting factors such as the weight of the handheld section of the blower, the dimensions of the handheld section of the blower, and the flexibility of the connection mechanism between the backpack mount and the handheld blower.

[0005] Accordingly, there is a need for technically improved devices for portable, such as backpack-mounted, blowers. In particular, a blower offering improved flexibility and user-friendly adjustment between the backpack mount and handheld blower would be advantageous. Overview

[0006] Aspects and advantages of the present disclosure are partly set forth in the following description, may be evident from the description, or can be learned through the practical application of the technique.

[0007] According to one embodiment, a backpack-carrying power tool is described. The power tool comprises a frame with a backplate that includes an upper end and a lower end and defines a backplate plane; and a tool body that is coupled to the frame via a coupling device. The coupling device includes a coupling element configured to allow movement of the tool body back and forth in a lateral direction relative to the backplate plane. The tool body includes a user interface configured to be gripped by a user to hold the tool body and control its movement.

[0008] These and other features, aspects, and advantages of the present disclosure will be better understood with reference to the following description and the accompanying claims. The accompanying drawings, which form part of this description, illustrate embodiments of the technology and, together with the description, serve to explain the principles of the technology. Brief description of the drawings

[0009] A complete and implementable disclosure of the present application, including the best way to manufacture and use the present systems and methods, which is addressed to a person skilled in the art, is set out in the description which refers to the accompanying drawings. Fig. Figure 1 is a perspective view of a backpack-carried power tool according to embodiments of the present disclosure; Fig. Figure 2 is an exploded view of a coupling element of a backpack-carried power tool according to embodiments of the present disclosure; Fig. Figure 3 is a schematic top view of a backpack-carried power tool illustrating the range of motion of a coupling element, according to embodiments of the present disclosure; Fig. Figure 4 is a perspective view of a first end of the coupling element according to embodiments of the present disclosure; Fig. Figure 5 is a side view of a coupling element according to embodiments of the present disclosure; Fig. Figure 6 is a side view of a coupling element according to embodiments of the present disclosure, illustrating the range of movement of the coupling element in the vertical direction; Fig. Figure 7 is a perspective view of a backpack-carried power tool in a storage position according to embodiments of the present disclosure; Fig. Figure 8 is a perspective view of a backpack-carried power tool comprising electrical and / or data cables, according to embodiments of the present disclosure; Fig. Figure 9 is a partial perspective view of a backpack-carried power tool in a storage position according to embodiments of the present disclosure. Fig. Figure 10 is a schematic representation of a backpack-carried power tool with a rack and pinion adjustment mechanism between the backpack and the tool; Fig. Figure 11 shows a perspective view of various flexible carriers of a coupling element according to embodiments of the present disclosure; Fig. Figure 12 shows a perspective view of a composite spring as a flexible support according to embodiments of the present disclosure; Fig. Figure 13 shows a perspective view of a backpack-carried power tool according to embodiments of the present disclosure; Fig. Figure 14 shows a partial cross-sectional view of the coupling element and the power tool according to embodiments of the present disclosure; Fig. Figure 15 shows a partially cutaway view of a power tool according to embodiments of the present disclosure; Fig. Figure 16A shows a top view of a backpack-carried power tool illustrating the lateral range of motion of a coupling element, according to embodiments of the present disclosure; Fig. Figure 16B shows a schematic representation of the range of motion of connecting elements of a coupling element according to embodiments of the present disclosure; Fig. Figure 16C shows a top view of a backpack-carried power tool illustrating the range of motion of a coupling element in the longitudinal direction, according to embodiments of the present disclosure; Fig. Figure 16D shows a schematic representation of the range of motion of connecting elements of a coupling element according to embodiments of the present disclosure; Fig. 17A shows a top view of a backpack-carried power tool illustrating the range of motion of a coupling element, according to embodiments of the present disclosure; Fig. Figure 17B shows a rear view of a backpack-carried power tool according to embodiments of the present disclosure; Fig. Figure 17C shows a rear view of a backpack-carried power tool according to embodiments of the present disclosure; Fig. Figure 18A shows a rear perspective view of a backpack-carried power tool according to embodiments of the present disclosure; Fig. Figure 18B shows a side perspective view of a coupling element of a backpack-carried power tool according to embodiments of the present disclosure; and Fig. Figure 18C shows a top view of a coupling element of a backpack-carried power tool according to embodiments of the present disclosure. Detailed description

[0010] Detailed reference will now be made to embodiments of the present disclosure, one or more examples of which are illustrated in the drawings. The word "exemplary" is used here to mean "serving as an example, case, or illustration." Each embodiment described here as "exemplary" is not necessarily to be understood as preferred or advantageous over other embodiments. Moreover, each example serves to illustrate, not to limit, the technology. Indeed, it will be obvious to those skilled in the art that modifications and variations can be made to the present technology without departing from the scope or concept of the claimed technology.

[0011] For example, features shown or described as part of one embodiment can be used with another embodiment to obtain yet another embodiment. Thus, the present disclosure is intended to cover such modifications and variations that fall within the scope of the appended claims and their equivalents. In the detailed description, numerical and letter designations are used to refer to features in the drawings. Identical or similar designations in the drawings and the description have been used to refer to identical or similar parts of the disclosure.

[0012] The terms "first," "second," and "third," as used herein, may be used interchangeably to distinguish one component from another and are not intended to denote the location or significance of any individual component. The singular forms "a," "an," and "the" encompass the multitude unless the context clearly indicates otherwise. The terms "coupled," "fixed," "attached to," and the like refer to both direct coupling, fixing, or attaching and indirect coupling, fixing, or attaching via one or more intermediate components or features, unless otherwise specified herein. The terms "includes," "comprehensive," "includes," "includes," "has," or other variations thereof, as used herein, are intended to include non-exclusive inclusion.For example, a process, procedure, object, or device that includes a list of characteristics is not necessarily limited to those characteristics but may also include other characteristics not expressly listed or inherent in such a process, procedure, object, or device. Unless expressly stated otherwise, "or" refers to an inclusive or and not an exclusive or. For example, a condition A or B is satisfied if any of the following conditions is met: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present).

[0013] Terms of approximation such as "about," "generally," "approximately," or "essentially" include values ​​that are within ten percent above or below the stated value. When used in conjunction with an angle or direction, these terms include values ​​within ten degrees greater or less than the stated angle or direction. For example, "essentially vertical" includes directions within ten degrees of the vertical in any direction, such as clockwise or counterclockwise.

[0014] Advantages, further benefits, and solutions to problems are described below with reference to specific embodiments. However, the advantages, benefits, solutions to problems, and all features that can effect or enhance an advantage, benefit, or solution are not to be interpreted as a decisive, necessary, or essential feature of one or all claims.

[0015] Essentially, electric backpack blower solutions must meet user requirements for blowing power (performance) and runtime within a reasonable weight limit (32 lbs). Designing a backpack tool with a lightweight, flexible spring to support the weight of the side-mounted tool reduces the user's load while allowing for significant lateral movement, with the spring assisting the tool's return to a neutral position. Including a tilting mechanism that allows for vertical rotation of the tool provides a substantial range of motion both up and down. Additionally, using a blower fan in front of the user improves system efficiency.

[0016] Referring to the drawings, shows Fig. 1 a backpack-carrying power tool 10 comprising a backpack assembly 12 and a tool body 14. As in Fig. As shown in Figure 1, the tool body 14 can be a blower, for example an axial blower. However, the inventors envisage that the tool body can be any type of backpack-carried power tool, such as a backpack sprayer or a cutting device, for example a chainsaw or hedge trimmer.

[0017] The backpack assembly 12 comprises a frame 16 with a backplate 18. The backplate 18 extends from an upper end 20 to a lower end 22 and defines a backplate plane between the upper end and the lower end (best in Fig. (8 to be seen). The backpack assembly 12 also includes shoulder straps 24, which are coupled to the backplate 18 and are designed to be worn on the user's back to support the weight of the tool 10. The backpack-carried power tool 10 can be electrically powered by one or more power tool batteries (not shown). The backpack assembly 12 can include a battery mounting assembly 26, which is designed to accommodate the one or more batteries and supply electrical power to the tool body 14. The batteries can be detachably coupled to the backpack assembly 12.

[0018] Fig. Figure 1 shows the tool body 14 as an axial blower. The axial blower comprises a blower housing 30 and a blower outlet pipe 32, which is coupled to a downstream end of the blower housing 30. The blower housing 30 defines a blower inlet bell 34 with a blower inlet 36 and a fan motor chamber 38 arranged downstream of the blower inlet bell 34. A motor and an axial fan (not shown) are arranged in the fan motor chamber 38. The motor is powered by one or more batteries mounted in the backpack assembly 12 and drives the fan to draw air through the inlet opening 36 into the blower housing 30 and to expel air from the blower housing 30 through an outlet (not shown) coupled to the blower outlet pipe 32. The outlet pipe 32 is coupled to the blower housing 30 near the outlet to direct the expelled air.

[0019] A user interface 40, for example a handle or a joystick 42, is coupled to the blower housing 30. If the user interface 40 is in the form of a joystick, the joystick 42 extends vertically from a top of the blower housing 30. In other words, a blower axis can be defined along the airflow direction of the axial blower from the blower inlet opening 36 through the outlet pipe 32, and the joystick 42 can extend in a direction that is substantially perpendicular to the blower axis. The user interface 40 is electrically coupled to the batteries and the motor. The user interface 40 can have one or more buttons 46 ( Fig. 9) include, which are designed to be operated by a user to supply electrical current to the motor that drives the fan and generates an airflow through the blower housing 30 and the outlet pipe 32. The handle 42 is also used to position and manipulate the outlet pipe 32 in order to direct the outlet and the airflow in a desired direction.

[0020] In some aspects of the present invention, the handle or joystick 42 is coupled to the blower inlet bell 34 of the blower housing 30. In some aspects of the present invention, the handle or joystick 42 may be coupled to the fan motor chamber 38 of the blower housing 30. For example, the handle or joystick 42 may be arranged in a position upstream of or behind the motor and fan assembly, downstream of or in front of the motor and fan assembly, or in line with (for example, above) the motor and fan assembly. In some aspects, the tool body 14 has a center of gravity (CG) that may coincide with the motor and fan assembly.The handle or joystick 42 can be arranged in a position upstream or behind the center of gravity of the tool body 14, downstream or in front of the center of gravity of the tool body 14, or in line with (for example, above) the center of gravity of the tool body 14.

[0021] In some aspects of the present invention, for example, as in Fig. As shown in Figure 9, the handle or joystick 42 can be adjustably coupled to the blower housing 30. For example, a slot 44 can be provided in the blower housing 30, and the handle or joystick 42 can be moved along the slot 44. The slot 44 can be substantially parallel to the blower axis and extend through at least a section of the blower inlet bell 34 and / or through at least a section of the fan motor chamber 38 of the blower housing 30. In this arrangement, the handle or joystick 42 can be moved from a position upstream of or behind the motor and fan assembly to a position downstream of or in front of the motor and fan assembly, including a position in line with (for example, above) the motor and fan assembly.In some aspects, the slot 44 can comprise discrete positions arranged at regular intervals where the joystick 42 can be positioned. In other aspects, the joystick 42 can be secured at any position along a length of the slot 44 without needing to be arranged at discrete positions.

[0022] The inventors have determined that the tool body 14, with a motor located within it, is heavier than existing backpack tools where the motor is located in the backpack assembly. This results in more weight and greater inertia that the user must counteract when holding the joystick 42 and guiding the tool body 14. Consequently, the position of the joystick 42 relative to the fan and motor assembly of the tool body 14, and thus the center of gravity of the tool body 14, directly affects the user's ability to comfortably hold and use the tool 14 for extended periods while bearing its weight. By positioning the joystick 42 behind the motor and fan assembly within the tool body 14, an arrangement can be achieved that requires less force to counteract the inertia of the tool body 14.Furthermore, the ability to adjust the position of the joystick 42 allows the user to find the most comfortable and ergonomic arrangement of the tool 10 for himself or herself.

[0023] With renewed reference to Fig. 1. The tool body 14 is attached laterally to the backpack assembly 12. In other words, when the backpack assembly 12 is worn by a user and supported on the user's back, the tool body 14 extends along one side of the user's body. While Fig. Figure 1 shows the tool body 14 on the right side of the backpack assembly 12, but it should be understood that the tool body 14 can alternatively be arranged on the left side of the backpack assembly 12. Furthermore, the tool 10 can comprise a plurality of tool bodies 14, for example, one tool body 14 on the right side and one on the left side, both coupled to the backpack assembly 12.

[0024] A coupling device 50 ( Fig. 7) is intended to couple the tool body 14 with the backpack assembly 12. As in Fig. As shown in Figure 1, the coupling device 50 comprises a first support rod 52, which is coupled to the backplate 18 and extends outward to a lateral side of the backplate 18. The first support rod 52 may extend along or parallel to the plane of the backplate. A second support rod 54 may be provided at a lateral end of the first support rod 52 and may be oriented in a direction or extend in a direction substantially perpendicular to the first support rod 52. A coupling element 60 is coupled to the first support rod 52 or the second support rod 54. As shown, the coupling element 60 is coupled to the second support rod 54, which extends substantially perpendicular to the plane of the backplate. For example, a coupling block 56 may be directly coupled to the first support rod 52 or the second support rod 54 and to the coupling element 60.

[0025] The coupling element 60 is configured to allow movement of the tool body 14 relative to the backpack assembly 12. In this way, the coupling element 60 can include a bending beam 62 or another flexible element configured to allow movement of the tool body 14 back and forth in a lateral direction relative to the user, i.e., relative to an axis defined by the second support rod 54, as well as a tilting mechanism 64 configured to allow movement of the tool body 14 in an up-and-down or vertical direction relative to the user.

[0026] Fig. Figure 2 shows an exploded view of the coupling element 60. The bending beam 62 comprises an elongated body 66. The elongated body 66 is configured to extend between a first bending beam end 68 and a second bending beam end 70. A pair of clamping blocks 72a, 72b can be provided at the first bending beam end 68. For example, the first bending beam end 68 can be clamped between the clamping blocks 72a and 72b to hold it in position. At the opposite end, i.e., at the second bending beam end 70, the elongated body 66 can be coupled to the tool body 14. The bending beam 62 is designed to be arranged parallel to the direction of airflow, i.e. along the blower axis, and in line with the blower axis, thereby counteracting the blowing force generated by a blower tool and contributing to the reduction of user fatigue.Further details regarding the structure of the interface between the bending beam 62 and the tool body 14 are given below.

[0027] The elongated body 66 of the bending beam 62 can be formed from an elongated rod or bar and can be made of a variety of materials and / or material composites. The elongated body 66 can be linear or nonlinear. Additionally, one or more supports can be coupled to the elongated body 66 of the bending beam 62. For example, as in Fig. 2 shown, the elongated body 66 is formed from a single piece or rod of hardened spring steel.

[0028] Along the length of the elongated body 66 from the first end 68 to the second end 70, the rod made of hardened spring steel can have a constant width and height. For example, in a specific embodiment of the disclosure, the elongated body 66 can comprise a piece of elongated hardened spring steel with a width of about 0.035 inches and a height of about 2 inches.

[0029] It is understood, however, that the elongated body 66 can assume a variety of forms, including shape, dimensions, and materials, based on the desired properties of the tool 10. For example, the elongated body 66 can also be formed from a tapered bar, a rod with a constant or tapered diameter, a wavy or corrugated bar, a ribbed bar, an angled triangle (i.e., a single piece of bar material formed into an elongated triangular shape), a truss, a band, and / or a belt, as shown, for example, in Fig. Figure 11 shows that the elongated body 66 can be formed from any suitable material, including, but not limited to, hardened spring steel, injection-molded plastic, polyester, fiberglass, carbon fiber, formed sheet metal, or a combination thereof. Additionally or alternatively, the elongated body 66 can include an overmolded material, such as a rubber and / or silicone injection mold, to modify the bending properties and / or to protect a user from sharp edges and to protect the elongated body 66 from damage.

[0030] For example, in Fig. As shown in Figure 2, the elongated body 66 can include one or more torsional stiffeners 74. The torsional stiffener(s) 74 can stiffen the elongated body 66 and improve the torsional stability of the bending beam 62. For example, the torsional stiffener(s) can allow fine-tuning of the spring rate of the elongated body 66. In some embodiments, the torsional stiffener(s) 74 can be made of a plastic material and have a corrugated shape, as shown in Figure 2. Fig. 2 shown. For example, in some aspects of the disclosure, the elongated body 66 may comprise two corrugated plastic torsional stiffeners 74, one of which is arranged along a top edge 76 of the elongated body 66 and one along a bottom edge 78 of the elongated body 66. As best as in Fig. 1 and Fig. As can be seen in Figure 9, a space 80 can be formed between the upper and lower torsion stiffeners 74, in which the elongated body 66 can be exposed.

[0031] In some aspects of the invention, the elongated body 66 can be configured as one or more of a variety of spring profiles. For example, as is best described in Fig. As can be seen in Figure 11, the elongated body 66 comprises one or more progressive or stacked springs 170, 172, which can increase the force required to deflect the spring over a distance in a particular direction. A progressive spring can be formed from a single integrated piece of material, as shown in Figure 11. Fig. 11 shown. For example, shows Fig. 11 a stacked spring comprising a spring 170 designed as a normal spring configured to bend in a clockwise direction, and a stacked spring 172 adjacent to the spring 170, increasing the difficulty of deflecting the springs 170, 172 in a counterclockwise direction.

[0032] In some aspects, an integrated spring 166 may also include a spring configured to allow the bending support 62 to bend in an upward and downward direction in order to adjust the distance of the tool body 14. In this way, an integrated spring 166 may include a first spring 168 configured to bend back and forth in a lateral direction and a second spring 174 at an opposite end to the first spring 168 configured to bend in an upward and downward tilting direction, for example, in addition to or as a replacement for the tilting bearing 90 described above.For example, if a spring rod made of hardened steel is used to form the integrated spring 166, the first spring 168 can extend in a direction that is substantially perpendicular to the second spring 174, with a spring connection 176 being formed between the first spring 168 and the second spring 174.

[0033] In some aspects, one or more coil springs 162 can be provided between the coupling block 56 and the blower tool 14. For example, a first coil spring 162a and a second coil spring 162b can be provided instead of the bending beam 62, as in Fig. 13 shown, and / or provided in addition to the bending beam 62. If more than one coil spring is provided, the coil springs 162a, 162b can be stacked vertically or arranged in another suitable arrangement to allow lateral movement of the tool 14 from one side to the other.

[0034] How best to Fig. 1 and Fig. As can be seen in Figure 14, the bending beam 62 is coupled to the tool body 14 at the second bending beam end 70. For example, the blower housing 30 can include a bending beam receptacle 110, which is configured to receive the second end 70. In some aspects, the second end 70 of the bending beam 62 can be inserted into the receptacle 110 or otherwise secured to the receptacle 110. As is best shown in Figure 14, the bending beam 62 is coupled to the tool body 14 at the second bending beam end 70. Fig. As can be seen in Figure 14, the second end 70 of the bending beam 62 can be received in a receiving housing 112. The receiving housing 112 can include a post or shaft 114 extending from it in a direction away from the bending beam 62. The shaft 114 can be inserted into the receiving housing 110. A stop 118 can be provided at one end of the shaft 114 to hold the shaft 114 in its position relative to the receiving housing 110 and to the tool 14.

[0035] The receptacle 110 can be arranged within the blower inlet 36 of the blower housing 30 and / or otherwise coupled to or arranged within the blower inlet bell 34. The receptacle 110 can be configured such that a longitudinal axis of the bending beam 62 runs parallel to the blower axis, i.e., is located centrally within the blower inlet 36. In some embodiments, however, the bending beam 62 can be mounted laterally to the right or left of the blower axis, for example, to modify the airflow characteristics at the blower inlet 36. The receptacle 110 can be configured such that the bending beam 62 extends vertically in a direction that is substantially perpendicular to the plane of the backplate to allow the pivoting movement of the bending beam 62 from left to right described above.In some aspects, the intake 110 may be provided with a sieve or screen arranged at the blower inlet 36 and designed, for example, to direct the airflow and / or to prevent dirt from entering the blower inlet 36.

[0036] In some aspects, such as in Fig. As shown in Figure 14, the receptacle 110 can also include a rolling bearing 116 configured to allow relative rotation between the shaft 114 and the tool 14. For example, a rotation of the user's wrist when operating the tool 14 can allow the tool 14, and in particular the bearing 116, to rotate about the shaft 114. The shaft 114 can coincide with a longitudinal axis of the tool 14. The joystick 42 can be rigidly coupled to the housing 30, for example by a retaining ring 48 surrounding the housing 30, so that a movement of the joystick 42 causes a movement of the tool 14.

[0037] Fig. Figure 3 shows a schematic representation of the lateral range of motion of the bending beam 62 relative to the backpack assembly 12. In the rest position, the bending beam 62 and the tool body 14 extend along the blower axis, which is in Fig. The bending beam 62 is shown as the X-axis. It can allow the tool body 14 to move up to approximately 90 degrees to the right of the X-axis. Additionally, it can allow the tool body 14 to move up to approximately 70 degrees to the left of the X-axis. In other words, the coupling element 60, which encompasses the bending beam 62, can allow a range of motion of approximately 160 degrees.

[0038] Furthermore, the coupling element 60, which includes the bending beam 62, can require a relatively lower actuating force compared to competing products in order to pivot the tool body 14 to the right and to the left. For example, the one in Fig. 1 and Fig. The tool 10 shown in Figure 2 requires an average force of approximately 3.0 lbs to pivot the tool body 14 90 degrees to the right of the X-axis and an average force of approximately 2.2 lbs to pivot the tool body 14 to a position 65 degrees to the left of the X-axis. The average (mean) right and left actuation force is approximately 2.6 lbs. Comparative data on the average (mean) right (90 degrees) and left (65 degrees) actuation force of competing products are listed in Table 1 below. As shown, the tool 10 of the present disclosure has an average actuation force reduced by approximately 15% compared to the closest product, Product A, and an average actuation force reduced by approximately 50% compared to the product with the highest actuation force, Product E. Table 1 Produkt Mittelwert der Betätigungskraft links (-65°)und rechts (+90°) Vorliegende Offenbarung 2,6 Ibs Produkt A 3,0 Ibs Produkt B 3,6 Ibs Produkt C 3,7 Ibs Produkt D 3,9lbs Produkt E 5,0 Ibs

[0039] When a spring is used to form the elongated body 66 of the bending beam 62, the spring can also help to return the tool body 14 to a neutral or starting position. Furthermore, the spring can absorb and / or respond to the axial thrust force generated by the blower outlet. In this way, users can utilize the springback properties of the bending beam 62 in sweeping and circular blowing techniques to guide dirt particles using the airflow expelled through the blower outlet.

[0040] With reference to Fig. Sections 2 and 4-6 now describe the tilting mechanism 64 in more detail. As in Fig. As shown in Figure 2, the tilting mechanism 64 can include a tilting bearing 90. The tilting bearing 90 can be coupled on one side to the coupling block 56 and on the opposite side to the first clamping block 72a. The tilting bearing 90 is configured to allow rotation of the clamping block 72a relative to the coupling block 56 by rotating the tilting bearing 90. In this way, the tilt of the entire coupling element 60 can be adjusted by rotating the tilting bearing 90. For example, if a user grasps the handle or joystick 42 and lifts it upwards, the coupling element 60 and the tool body 14 can be raised into an upwardly tilted position by rotating the tilting bearing 90. The tilting mechanism 64 allows a user to rotate the tool body 14 approximately 90 degrees in either direction relative to a horizontal axis.In other words, the tilting mechanism 64 can have a range of motion of approximately 180 degrees, as shown in . Fig. 6 shown. In this respect, tool 10 can have a storage position (i.e., when tool 10 is stored and not in use) which is shown in Fig. Figure 7 shows the tilting mechanism 64 being rotated upwards by 90 degrees from the horizontal axis and the tool body 14 extending substantially in a direction parallel to the back plate plane.

[0041] The tilting mechanism 64 can also include a tilt support tension spring 92. The tilt support tension spring 92 can help to support the weight of the tool body 14. For example, the tilt support tension spring 92 can be a coil spring. The tilt support tension spring 92 can be coupled to a first spring holder 94, which is coupled to the clamping blocks 72a, 72b, and to a second spring holder 96, which is coupled to the coupling block 56. In some aspects of the invention, both clamping blocks 72a, 72b have substantially straight top surfaces and curved rear surfaces, so that the spring 92 can extend along the top surfaces and around at least a section of the curved rear surfaces to the second spring holder 96. The second spring holder 96 can be positioned below a central longitudinal axis of the coupling element 60 and the bending beam 62, as is best shown in Fig. Figure 5 shows that the coupling block 56 may also include a spring guide 98, which is arranged to be positioned opposite the curved rear face of the clamping blocks 72a, 72b in order to guide the positioning of the spring 92 and to hold the spring 92 in position between the clamping blocks 72a, 72b and a surface of the spring guide 98. In this arrangement, the spring 92 is tensioned such that it supports the weight of the tool body 14. Without the tilt support tension spring 92, the tool body 14 and the coupling element 60 would rest at an inclination of approximately -90 degrees relative to a horizontal axis, i.e., towards the ground or ground surface, due to the rotation of the tilting mechanism 64. If the spring 92 has a spring constant of about 8.9 lb / in, the tilt support tension spring 92 can allow the tool body 14 to rest in a position of about -33 degrees relative to a horizontal axis, as shown in Fig. 5 shown.

[0042] The tilting mechanism 64 may, in addition to or as an alternative to the tilting bearing 90, include one or more mechanisms such as a slotted pivot mechanism, a torsion spring, and / or rolling contact joints. For example, a pre-tensioned torsion spring may allow adjustment of the tilt in an upward and downward direction, similar to a mechanism commonly used for garage door locks.

[0043] In Fig. 8 One or more power and / or data cables 82 are provided to connect the power source and all electronic components mounted in the backpack assembly 12 to the user interface 40 and the motor of the tool body 14. In some aspects, the cables 82 can be integrated into the coupling device 50, for example, by providing a cable duct (not shown). The cables 82 can extend along the first support rod 52 and / or the second support rod 54, along and / or through the coupling block 56 and the clamping blocks 72a, 72b, and along the elongated body 66 of the bending beam 62 to the tool body 14. For example, the cables 82 can extend along the elongated body 66 in the space 80 between the torsional stiffeners 74. The cables 82 can be provided as flat cables, for example flexible strips, in order to form an extremely flat profile along the bending beam 62 and through the blower housing 30.

[0044] In further aspects of the present disclosure, the coupling device 50 can also allow the position of the coupling block 56 to be adjusted relative to the first support rod 52 and / or the second support rod 54. For example, the coupling block 56 can be displaceable relative to the first support rod 52 in a forward / backward direction. In this way, the entire coupling element 60 and the tool body 14 can be moved forward or backward to allow a user to adjust the position of the tool body 14 for convenient and / or ergonomic positioning.

[0045] For example, as in Fig. As shown in Figure 9, a slot 100 is provided along a section of the second support rod 54 to allow forward and backward displacement of the coupling block 56.

[0046] Fig. Figure 10 shows a rack and pinion mechanism for adjusting the position of the coupling block 56 relative to the backpack assembly 12. For example, a pinion mounting shaft 120 can be coupled to the backpack assembly 12. A rack 122 and a pinion 124 can be arranged within a housing, such as the coupling block 56. A knob 126 can be coupled to an outer surface of the housing, such as the coupling block 56, so that a user can rotate the pinion and thereby adjust the position of the tool 14 relative to the backpack assembly 12. In this way, the entire coupling element 60 and the tool body 14 can be moved forward or backward so that a user can adjust the position of the tool body 14 for convenient and / or ergonomic positioning.

[0047] Furthermore, the blower tool 14 of the present invention, as shown in Fig. Figure 15 shows that the tool comprises one or more vibration damping elements. In particular, the vibration damping elements may be located near the motor and / or the blower of the tool 14. Fig. Figure 15 shows a motor / fan chamber 38 arranged within the housing 30 of the blower tool 14. The motor and fan can be arranged within a stator 128 inside the housing 30. One or more insulating rings 130 can be provided on or around the stator 128 between the stator 128 and the housing 30. For example, two insulating rings 130 can be provided, or any other suitable number or arrangement of insulating rings 130. In some aspects, the insulating ring(s) 130 can extend around the entire circumference of the stator 128 and / or one or more circumferential sections around the stator 128. However, one or more insulating elements can also be provided in alternative geometric arrangements, such as strips along the stator, etc.The insulating ring(s) 130 and / or other insulating elements may be made of rubber or another suitable vibration-damping material. By providing the insulating ring(s) 130 and / or other insulating elements, vibrations and noise from the operation of the motor and fan of the blower can be dampened, for example by isolating the vibrations and noise from the operation of the motor and fan from the outer casing 30 of the blower tool 14.

[0048] In Fig. Figures 16A-D, 17A-C, and 18A-B consider several alternatives for the coupling device 50 between the frame 16 and the tool body 14. In particular, the coupling device 50 can comprise various configurations to couple the first support rod 52 and the tool body 14, enabling movement of the blower through the range of motion of a user arm. For example, a plurality of connecting elements 200 can be provided between the first support rod 52 and the tool body 14, and some or all of the plurality of connecting elements 200 can be movable in at least one degree of freedom relative to each adjacent connecting element 200. The plurality of connecting elements 200 can be resiliently connected or limited to ensure predictable, intuitive movement of the tool body 14 over the range of motion of the coupling device 50.

[0049] For example, show Fig. 16A-D a coupling device 50 comprising a first support rod 52 coupled to the frame 16 and a plurality of connecting elements 200 coupled between the first support rod 52 and the tool body 14. In particular, the coupling device 50 comprises Fig. 16A-D a plurality of connecting elements 200 which are configured to allow the coupling device 50 to be folded and extended, thereby enabling movement of the tool body 14 towards or away from the user's body (as best described in Fig. (as shown in Figures 16C-D). The plurality of connecting links 200 can comprise connecting links 200a, 200b, 200c, 200d and joints 202a, 202b, 202c between them. A primary joint 204 can be arranged between the first support rod 52 and the first connecting link 200a. The connecting links 200 can pivot about each respective joint. In particular, each of the joints 202a, 202b, 202c, and 204 can have a different range of angular movement. For example, the primary joint 204 can have a range of movement in a range of about 20 degrees to about 90 degrees, for example, about 40 degrees to about 70 degrees, through which the first connecting link 200a can move relative to the first support rod 52.The joint 202a can allow a range of motion of approximately 80 degrees to approximately 180 degrees, for example, approximately 100 degrees to 160 degrees, between the first connecting link 200a and the second connecting link 200b, in particular to move the second connecting link 200b closer to the first connecting link 200a when the coupling device 50 is folded. The joint 202b can allow a range of motion of approximately 10 degrees to approximately 120 degrees, for example, approximately 30 degrees to 90 degrees, between the second link 200b and the third link 200c. The joint 202c can have a relatively shallow range of motion compared to other joints, for example, approximately 0 degrees to approximately 45 degrees, for example, approximately 5 degrees to approximately 40 degrees, between the third connecting link 200c and the fourth connecting link 200d.

[0050] Furthermore, the multiple connecting elements 200 can be coupled to the tool body 14 from below the tool body 14. For example, the most distal connecting element from the frame 14, for example the fourth connecting element 200d, can be coupled as shown in Fig. As shown in Figures 16A-D, the connection 210 comprises a joint to the tool body 14. In some aspects, the joint 210 may include a curved or concave connecting body 212, for example, a yoke, configured to receive the tool body 14. One or more fasteners (not shown) may couple the connecting body 212 to the tool body 14. The one or more fasteners may also allow upward and downward movement of the tool body 14, as desired by a user, for example, along a horizontal axis defined by the one or more fasteners.

[0051] Fig. Figures 17A-C illustrate one aspect of the coupling device 50 with a plurality of connecting links 200, which are coupled to the first support rod 52, for example, at a central section of the frame 16 instead of at a side of the frame 16. For example, the connecting links 200e, 200f, 200g may be provided with joints 202e, 202f between them. The joints 202e and 202f may be locked at a specific locking angle during use, for example, to allow switching between the pivot points formed at the joints 202e, 202f. The pivot points may operate sequentially rather than simultaneously. For example, each joint 202e, 202f may be locked at a substantially right angle when not pivoted. The switching pivot points create an elliptical path instead of a circular motion to better accommodate a user's reach and elbow extension.

[0052] For example, the coupling device 50 can allow pivoting about the first joint 202e during operation as a user moves through the range of motion of their shoulder, while the second joint 202f can remain locked during this time. If a user intends to move the tool body 14 beyond the range of motion of their shoulder over their body, the first joint 202e can be locked and the second joint 202f can move through its range of motion as the user moves their elbow and / or wrist to steer the nozzle of the tool body 14. One or more detents (not shown) can be provided to allow the locking of the first joint 202e and the second joint 202f.

[0053] As in Fig. As shown in Figure 17A-C, the connection 210 can comprise a concave connecting body 212 or a yoke similar to the one described above. Fig. 17A-C the yoke can be coupled to a lateral side of the tool body 14, for example to increase the upward and downward movement range of the tool body 14 compared to the arrangement of the connecting elements 200 below the tool body 14.

[0054] Fig. 18A-B show a similar arrangement to that in Fig. 16A-D, for example, with a plurality of connecting elements 200 coupled between the first support rod 52 and the connection 210 with the tool body 14. As is best done in Fig. As shown in Figure 18B, each of the plurality of connecting links 200 can optionally include connecting links 200x, each having substantially the same size and shape. For example, each of the connecting links 200x can include a receiving end 206 and a coupling end 208 at opposite longitudinal ends of the connecting link 200x. In some aspects, the receiving end 206 can be concave or convex and dimensioned and shaped to be complementary to the coupling end 208 of an adjacent connecting link 200x. Hinges 200x can be provided between each adjacent link 200x. The connecting links 200x can include a fastening element 216 that forms a pivot point about which the adjacent connecting links 200x can pivot or rotate.For example, each of the receiving ends 206 and coupling ends 208 can include one or more fastener receiving openings (not shown) oriented vertically to receive a fastener 216. A fastener 216 can also be provided to couple the first support rod 52 and a first of the connecting links 200x. It is understood, however, that the connecting links 200x can each be of different sizes, while still comprising complementary receiving ends 206 and coupling ends 208.

[0055] In some aspects, such as how best to... Fig. As shown in Figure 18B-C, one or more springs can be provided with the coupling device 50 to return the connecting links 200 to a neutral position when not being steered by a user. For example, an elastomeric spring 222 can be provided along one or both lateral sides of the connecting links 200x to press the connecting links 200x into a centered or non-pivoting position. The elastomeric spring(s) 222 can extend only along a section of the connecting links 200x or substantially along their entire length from the first support rod 52 to the connection 210.

[0056] Furthermore, as in Fig. As shown in Figure 18B, one or more springs 224 may be provided between adjacent connecting members 200x. For example, one or more compression springs 224 may be provided between a pair of adjacent connecting members 200x. In some aspects, each of the connecting members 200x may include a receiving channel 226 configured to receive a compression spring 224. In this arrangement, the connecting members 200x can oscillate about each connection 202e, and the compression springs 224 between the adjacent connecting members 200x can return the connecting members 200x to a neutral position.

[0057] Similar to what was described above, the in Fig. 18A coupling device 50 has a concave connecting body 212 or yoke which is designed to receive the tool body 14 and to support the tool body 14 from below.

[0058] In the in relation to Fig. In the arrangements shown and described in Figures 18A-C, the connecting elements 200x, which are pivotable relative to each other, can essentially function as bones, and the elastomeric springs 222 along both sides of the connecting elements 200x and / or the springs 224 between the connecting elements 200x can essentially function as tendons. The biomimicry of the in Fig. The arrangement shown in 18A-C can make the movement of the tool body 14 feel as natural as possible to a user.

[0059] Further aspects of the disclosure are indicated by one or more of the following embodiments: A power tool comprising: a frame comprising a backplate with an upper end and a lower end and defining a backplate plane; and a tool body coupled to the frame via a coupling device, the coupling device comprising a coupling element configured to allow movement of the tool body back and forth in a lateral direction relative to the backplate plane; the tool body comprising a user interface configured to be gripped by a user to hold the tool body and direct its movement.

[0060] The power tool according to one or more of the embodiments, in which the coupling element comprises at least one spring.

[0061] The power tool according to one or more of the embodiments, in which the at least one spring comprises an elongated linear piece of spring steel.

[0062] The power tool according to one or more of the embodiments, in which the elongated linear piece of spring steel extends between a coupling body and the tool body, wherein the coupling body comprises a first clamping block and a second clamping block, wherein a first end of the at least one spring is clamped between the first clamping block and the second clamping block.

[0063] The power tool according to one or more of the embodiments, in which the coupling element also comprises at least one grooved body.

[0064] The power tool according to one or more of the embodiments, in which the coupling element comprises a coupling body and the at least one spring extends from the coupling body to the tool body.

[0065] The power tool according to one or more of the embodiments, wherein the coupling device also comprises a support rod rigidly coupled to the back plate.

[0066] The power tool according to one or more of the embodiments, further comprising a coupling block coupled to the support rod, wherein the coupling element is coupled to the coupling block.

[0067] The power tool according to one or more of the embodiments, wherein the coupling element is displaceable relative to the support rod in a direction that is substantially perpendicular to the back plate plane.

[0068] The power tool according to one or more of the embodiments, wherein the coupling device also includes a tilting mechanism designed to enable movement of the tool body in a vertical direction upwards and downwards.

[0069] The power tool according to one or more of the embodiments, wherein the tilting mechanism includes a bearing and the coupling element is configured to rotate about the bearing through a range of motion of approximately 180 degrees.

[0070] The power tool according to one or more of the embodiments, wherein the tilting mechanism also includes a spring, the spring limiting the movement in a vertical downward direction when the tool body is not held by the user at the user interface.

[0071] The power tool according to one or more of the embodiments, wherein the tool body comprises a blower, the blower comprising a blower housing defining a blower inlet bell and a fan motor chamber, a fan and a motor arranged in the fan motor chamber, and an outlet pipe coupled to a downstream end of the blower housing, wherein the coupling element of the coupling device is coupled to the tool body.

[0072] The power tool according to one or more of the embodiments, wherein the blower comprises a receptacle, the coupling element being attached to the receptacle.

[0073] The power tool according to one or more of the embodiments, in which the intake is located in an air intake chamber of the blower intake bell.

[0074] The power tool according to one or more of the embodiments, wherein the receptacle includes a bearing configured to allow rotation of the blower relative to the coupling element.

[0075] The power tool according to one or more of the embodiments in which the user interface is coupled to the blower inlet bell.

[0076] The power tool according to one or more of the embodiments, in which the user interface is arranged upstream of the fan motor chamber.

[0077] The power tool of one or more embodiments, in which the user interface is adjustable relative to the blower housing along an axis parallel to a longitudinal axis of the tool body.

[0078] The power tool according to one or more of the embodiments, wherein the user interface is movable towards and away from the outlet pipe.

[0079] This written description uses examples to disclose the present application, including the best embodiment, and to enable a person skilled in the art to put the disclosure into practice, including the manufacture and use of devices or systems and the performance of methods contained therein. The patentable scope of the disclosure is defined by the claims and may include further examples that a person skilled in the art might think of. Such further examples shall fall within the scope of the claims if they comprise design elements that do not differ from the wording of the claims or if they comprise equivalent design elements with insignificant differences from the wording of the claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 63 / 675,500

[0001] US 63 / 708,086

[0001] US 63 / 739,993

[0001]

Claims

[1] Power tools, including: a frame that includes a backplate with an upper end and a lower end and defines a backplate plane; and a tool body that is coupled to the frame via a coupling device, wherein the coupling device comprises a coupling element which is configured to allow movement of the tool body back and forth in a lateral direction relative to the back plate plane; wherein the tool body includes a user interface designed to be grasped by a user to support the tool body and direct its movement. [2] Power tool according to claim 1, wherein the coupling element comprises at least one spring. [3] Power tool according to claim 2, wherein the at least one spring comprises an elongated linear piece of spring steel. [4] Power tool according to claim 3, wherein the elongated linear piece of spring steel extends between a coupling body and the tool body, the coupling body comprising a first clamping block and a second clamping block, wherein a first end of the at least one spring is clamped between the first clamping block and the second clamping block [5] Power tool according to claim 2, wherein the coupling element also comprises at least one grooved body. [6] Power tool according to claim 2, wherein the coupling element comprises a coupling body and the at least one spring extends from the coupling body to the tool body. [7] Power tool according to claim 1, wherein the coupling device also comprises a support rod rigidly coupled to the back plate. [8] Power tool according to claim 7, further comprising a coupling block coupled to the support rod, wherein the coupling element is coupled to the coupling block. [9] Power tool according to claim 7, wherein the coupling element is displaceable relative to the support rod in a direction which is substantially perpendicular to the back plate plane. [10] Power tool according to claim 1, wherein the coupling device further comprises a tilting mechanism which is configured to enable movement of the tool body in a vertical direction upwards and downwards. [11] Power tool according to claim 10, wherein the tilting mechanism comprises a bearing and the coupling element is configured to rotate about the bearing in a range of motion of about 180 degrees. [12] Power tool according to claim 10, wherein the tilting mechanism further comprises a spring, the spring limiting the movement in the vertical downward direction when the tool body is not held by the user at the user interface. [13] Power tool according to claim 1, wherein the tool body comprises a blower, the blower comprising a blower housing defining a blower inlet bell and a fan motor chamber, a fan and a motor arranged in the fan motor chamber, and an outlet pipe coupled to a downstream end of the blower housing, wherein the coupling element of the coupling device is coupled to the tool body. [14] Power tool according to claim 13, wherein the blower comprises a receptacle, the coupling element being attached to the receptacle. [15] Power tool according to claim 14, wherein the receptacle is located in an air inlet chamber of the blower inlet bell. [16] Power tool according to claim 14, wherein the receptacle comprises a bearing configured to allow rotation of the blower relative to the coupling element. [17] Power tool according to claim 13, wherein the user interface is coupled to the blower inlet bell. [18] Power tool according to claim 13, wherein the user interface is arranged upstream of the fan motor chamber. [19] Power tool according to claim 13, wherein the user interface is adjustable relative to the blower housing along an axis parallel to a longitudinal axis of the tool body. [20] Power tool according to claim 19, wherein the user interface is movable towards and away from the outlet pipe. [21] Power tool according to claim 1, wherein the coupling element comprises a first joint and a second joint. [22] Power tool according to claim 1, wherein the coupling element comprises a plurality of connecting elements, wherein at least two connecting elements of the plurality of connecting elements are rotatably coupled at a joint. [23] Power tool according to claim 22, in which at least two connecting members of the plurality of connecting members are foldable relative to each other to allow forward and backward movement of the tool body in relation to the frame. [24] Power tool according to claim 22, wherein the coupling element also comprises at least one spring coupled to the at least two connecting members. [25] Power tool according to claim 24, wherein the at least one spring is coupled to each connecting element of the plurality of connecting elements. [26] Power tool according to claim 24, wherein the at least one spring extends between the at least two connecting members. [27] Power tool according to claim 1, wherein the coupling element supports the tool body from below the tool body.

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