WO2020236046A1

WO2020236046A1 - Power tool tank assembly,closure device, and power tool

Info

Publication number: WO2020236046A1
Application number: PCT/SE2019/050461
Authority: WO
Inventors: Jacob KRANTZ; Martin ALMGREN; Joakim SAMEFORS; Oscar LERNSTÅL; Daniel FLYCKT
Original assignee: Husqvarna Ab
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2020-11-26

Abstract

A power tool tank assembly (1, 1') is disclosed comprising a tank (2, 2') with a refill opening (4) and an inner volume (5) for accommodating a liquid, and a closure device (7) for closing the refill opening (4). The closure device (7) comprises a light emitting device (9) configured to illuminate at least part of the inner volume (5) of the tank (2, 2'). The present disclosure 5 further relates to a closure device (7) for a power tool tank assembly (1, 1') and a handheld power tool (30) comprising a tank assembly (1, 1').

Description

Power Tool Tank Assembly, Closure Device, and Power Tool

TECHNICAL FIELD

The present disclosure relates to a power tool tank assembly. The present disclosure further relates to a closure device configured to close a refill opening of a tank of a power tool tank assembly, and a handheld power tool comprising a tank assembly.

BACKGROUND

Today, there are many kinds of power tools available on the market. A common feature of power tools is that they comprise a tool which can be driven by a power source other than solely manual labour. The power source may for example comprise an electric motor, a pneumatic motor, a combustion engine, or the like. Some power tools comprise a tank assembly with a tank configured to accommodate a liquid, such as fuel, oil, or the like. The fill level of liquid in the tank is usually an important aspect since an insufficient amount of liquid may cause a malfunction of the power tool or may limit the available operational time of the power tool.

One way to handle this problem is to arrange an inspection window in a surface the tank allowing a user to visually inspect the amount of liquid in the tank through the inspection window. Such a solution requires the user to orient the power tool in a particular orientation relative to the gravitational field to be able to assess the amount of liquid in the tank.

Moreover, power tools are usually used in dirty and demanding environments in which the power tool risks getting coated with dirt and dust which may make inspection through the inspection window difficult and time-consuming.

Another way to handle this problem is to arrange a dip stick for example on a closure device of the tank assembly. Such a solution requires the user to orient the power tool in a particular orientation relative to the gravitational field and to remove and clean the dip stick and to dip the dip stick into the liquid in the tank and then to move the dip stick out from the tank to visually inspect the liquid on the dip stick to thereby assess the amount of liquid in the tank. Obviously, in many situations, such an inspection procedure can be difficult and time- consuming. Moreover, as mentioned, power tools are usually used in dirty and demanding environments and there is a risk that dirt, dust, and debris is entering the tank during such an inspection procedure.

In summary, with the previously available solutions, the task of inspection the amount of liquid in the tank of a power tool tank assembly is usually time-consuming and burdensome. As a further result thereof, a user may not ensure that the tank is filled with a sufficient amount of liquid which may limit the available operational time of the power tool and may cause damages to the power tool.

SUMMARY

It is an object of the present invention to overcome, or at least alleviate, at least some of the above-mentioned problems and drawbacks.

According to a first aspect of the invention, the object is achieved by a power tool tank assembly comprising a tank with a refill opening and an inner volume for accommodating a liquid, and a closure device for closing the refill opening. The closure device comprises a light emitting device configured to illuminate at least part of the inner volume of the tank.

Since the closure device comprises a light emitting device configured to illuminate at least part of the inner volume of the tank, a tank assembly is provided capable of significantly facilitating the process of inspecting the amount of liquid in tank. This because the

illumination of the at least part of the inner volume of the tank facilitates visual inspection of the amount of liquid in the tank, also in case of poor visibility conditions. As a result, a tank assembly is provided allowing a user to inspect the amount of liquid in the tank in a quicker, simpler, and more reliable manner also in case of poor visibility conditions.

Accordingly, a tank assembly is provided allowing a user to inspect the amount of liquid in the tank to assess whether the tank needs to be filled with more liquid, as well as allowing a user to inspect the amount of liquid in the tank to assess whether the tank has been filled with a correct amount of liquid, in a quick, simple, and more reliable manner also in case of poor visibility conditions.

Accordingly, a power tool tank assembly is provided overcoming, or at least alleviating, at least some of the above-mentioned problems and drawbacks. As a result, the above- mentioned object is achieved.

Optionally, at least a portion of the tank is at least partially transparent so that at least part of the inner volume of the tank is visually checkable from outside of the tank via the at least portion of the tank. Thereby, a tank assembly is provided allowing a user to inspect the amount of liquid a quicker, simpler, and more reliable manner without having to remove the closure device from the refill opening. This because the illumination of the at least part of the inner volume of the tank by the light emitting device facilitates visual inspection of the amount of liquid in the tank through the at least portion of the tank, also in case of poor visibility conditions.

Optionally, the tank of the tank assembly comprises an inspection window. Thereby, a tank assembly is provided allowing a user to inspect the amount of liquid a quicker, simpler, and more reliable manner without having to remove the closure device from the refill opening. Moreover, the illumination of the at least part of the inner volume of the tank by the light emitting device facilitates visual inspection of the amount of liquid through the inspection window, also in case of poor visibility conditions.

Optionally, at least a portion of the tank is formed by an at least partially transparent material. Thereby, a tank assembly is provided allowing a user to inspect the amount of liquid a quicker, simpler, and more reliable manner without having to remove the closure device from the refill opening. Moreover, the illumination of the at least part of the inner volume of the tank by the light emitting device facilitates visual inspection of the amount of liquid through the at least a portion of the tank, also in case of poor visibility conditions.

Optionally, the closure device comprises one or more batteries configured to supply electricity to the light emitting device. Thereby, a simple and efficient supply of electricity to the light emitting device is provided and the need for an external power supply to the one or more batteries is circumvented.

Optionally, the tank is a fuel tank. Thereby, a tank assembly is provided allowing a user to inspect the level of fuel in the fuel tank in a quicker, simpler, and more reliable manner also in case of poor visibility conditions. As a further result thereof, the user can in a quicker, simpler, and more reliable manner ensure to obtain a sufficient operational time of the power tool also in case of poor visibility conditions.

Optionally, the tank is an oil tank. Thereby, a tank assembly is provided allowing a user to inspect the level of oil in the fuel tank in a quicker, simpler, and more reliable manner also in case of poor visibility conditions. As a further result thereof, the user can in a quicker, simpler, and more reliable manner ensure to not operate the power tool with insufficient lubrication, also in case of poor visibility conditions.

Optionally, the closure device comprises a switch for activating and deactivating the light emitting device. Thereby, a tank assembly is provided allowing a user to activate the light emitting device when inspecting the amount of liquid in the tank and to deactivate the light emitting device after such an inspection, in a simple and reliable manner.

Optionally, the closure device comprises a button operably connected to the switch. Thereby, tank assembly is provided allowing a user to activate and deactivate the light emitting device in a simple and user-friendly manner.

Optionally, the closure device comprises a body portion for engagement with the refill opening, and a movable member including a grip portion, which movable member is moveably connected to the body portion for movement between a retracted position and a protruding position, in which protruding position the grip portion extends outwardly of the body portion to form a grip and thereby assist in loosening and tightening the closure device, and wherein the switch is operably connected to the movable member. Thereby, a closure device is provided comprising a movable member serving two functions, namely facilitating loosening and tightening the closure device and activating and deactivating the light emitting device. In this manner, the number of components of the closure device can be kept low while achieving these functions, which provides conditions for a reliable closure device and conditions for manufacturing and assembling the closure device in a cost-efficient manner. Moreover, when in the retracted position, the movable member is less likely to knock into objects and to disturb a user.

Thus, due to these features, a tank assembly is provided allowing a user to loosening and tightening the closure device in a simpler and less burdensome manner, as well as allowing a user to inspect the amount of liquid in the tank in a quicker, simpler, and more reliable manner also in case of poor visibility conditions.

Optionally, the switch is operably connected to the movable member in a manner such that the switch activates the light emitting device when the movable member is in the protruding position and deactivates the light emitting device when the movable member is in the retracted position. Thereby, tank assembly is provided allowing a user to activate the light emitting device simply by moving the movable member to the protruding position and to deactivate the light emitting device simply by moving the movable member to the retracted position. Moreover, in most cases, a user will move the movable member to the protruding position when wanting to remove the closure device from the refill opening. Since the switch is configured to activate the light emitting device when the movable member is in the protruding position, the light emitting device will illuminate at least part of the inner volume of the tank in an automatic manner when the movable member is moved to the protruding position, i.e. when a user wants to remove the closure device from the refill opening. Thus, due to these features, a user-friendly closure device and tank assembly is provided allowing a user to activate and deactivate the light emitting device in a simple and intuitive manner.

Optionally, the movable member is pivotal about a pivotal axis and pivotally connected to the body portion for movement between the retracted position and the protruding position. Thereby, a user-friendly closure device and tank assembly is provided allowing a user to pivot the movable member between the retracted and protruding positions in a simple and intuitive manner.

According to a second aspect of the invention, the object is achieved by a closure device configured to close a refill opening of a tank of a power tool tank assembly, wherein the power tool tank assembly comprises the tank with the refill opening and an inner volume for accommodating a liquid, wherein the closure device comprises a light emitting device configured to illuminate at least part of the inner volume of the tank and a switch for activating and deactivating the light emitting device, and wherein the closure device comprises a body portion for engagement with the refill opening, and a movable member including a grip portion, which movable member is moveably connected to the body portion for movement between a retracted position and a protruding position, in which protruding position the grip portion extends outwardly of the body portion to form a grip and thereby assist in loosening and tightening the closure device, and wherein the switch is operably connected to the movable member.

Since the closure device comprises a light emitting device configured to illuminate at least part of the inner volume of the tank, a closure device is provided capable of significantly facilitating the process of inspecting the amount of liquid in tank. This because the illumination of the at least part of the inner volume of the tank facilitates visual inspection of the amount of liquid in the tank, also in case of poor visibility conditions. As a result, a closure device is provided allowing a user to inspect the amount of liquid in the tank in a quicker, simpler, and more reliable manner also in case of poor visibility conditions.

Accordingly, a closure device is provided allowing a user to inspect the amount of liquid in the tank to assess whether the tank needs to be filled with more liquid, as well as allowing a user to inspect the amount of liquid in the tank to assess whether the tank has been filled with a correct amount of liquid, in a quick, simple, and more reliable manner also in case of poor visibility conditions. Moreover, a closure device is provided comprising a movable member serving two functions, namely facilitating loosening and tightening the closure device and activating and

deactivating the light emitting device. In this manner, the number of components of the closure device can be kept low while achieving these functions, which provides conditions for a reliable closure device and conditions for manufacturing and assembling the closure device in a cost-efficient manner. Moreover, when in the retracted position, the movable member is less likely to knock into objects and disturb a user.

Thus, due to these features, a closure device is provided allowing a user to loosening and tightening the closure device in a simpler and less burdensome manner, as well as allowing a user to inspect the amount of liquid in the tank in a quicker, simpler, and more reliable manner also in case of poor visibility conditions.

Accordingly, a closure device is provided overcoming, or at least alleviating, at least some of the above-mentioned problems and drawbacks. As a result, the above-mentioned object is achieved.

Optionally, the light emitting device of the closure device is configured to emit light having a dominant wavelength of approximately 590 - 740 nanometres. Light having a dominant wavelength of approximately 590 - 625 nanometres is usually referred to as orange light and light having a dominant wavelength of approximately 625 - 740 nanometres is usually referred to as red light. Studies have shown that light having these dominant wavelengths is particular efficient in facilitating visual inspection of the amount of liquid in a tank of a power tool tank assembly. Accordingly, due to these features, a closure device is provided allowing a user to inspect the amount of liquid in the tank in a further quicker, simpler, and more reliable manner.

According to a third aspect of the invention, the object is achieved by a handheld power tool comprising a tank assembly according to some embodiments of the present disclosure.

Thereby, a handheld power tool is provided allowing a user to inspect the amount of liquid in the tank in a quicker, simpler, and more reliable manner also in case of poor visibility conditions.

Accordingly, a handheld power tool is provided allowing a user to inspect the amount of liquid in the tank to assess whether the tank needs to be filled with more liquid, as well as allowing a user to inspect the amount of liquid in the tank to assess whether the tank has been filled with a correct amount of liquid, in a quick, simple, and more reliable manner also in case of poor visibility conditions.

Accordingly, a handheld power tool is provided overcoming, or at least alleviating, at least some of the above-mentioned problems and drawbacks. As a result, the above-mentioned object is achieved.

Optionally, the handheld power tool is a chainsaw. Thereby, a chainsaw is provided allowing a user to inspect the amount of liquid in the tank in a quicker, simpler, and more reliable manner also in case of poor visibility conditions.

Accordingly, a chainsaw is provided allowing a user to inspect the amount of liquid in the tank to assess whether the tank needs to be filled with more liquid, as well as allowing a user to inspect the amount of liquid in the tank to assess whether the tank has been filled with a correct amount of liquid, in a quick, simple, and more reliable manner also in case of poor visibility conditions.

Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

Various aspects of the invention, including its particular features and advantages, will be readily understood from the example embodiments discussed in the following detailed description and the accompanying drawings, in which:

Fig. 1 illustrates a power tool tank assembly according to some embodiments,

Fig. 2 illustrates a perspective view of a closure device according to the embodiments illustrated in Fig. 1 ,

Fig. 3 illustrates an exploded view of the closure device according to the embodiments illustrated in Fig. 1 and Fig. 2,

Fig. 4 illustrates a cross section of a closure device according to the embodiments illustrated in Fig. 1 - Fig. 3, in which a movable member is illustrated in the retracted position, Fig. 5 illustrates the cross section of the closure device illustrated in Fig. 4, with the movable member illustrated in the protruding position,

Fig. 6 illustrates a closure device according to some further embodiments,

Fig. 7 illustrates a closure device, according to some further embodiments, in a

disassembled state,

Fig. 8 illustrates the closure device according to the embodiments illustrated in Fig. 7, in an assembled state, and

Fig. 9 illustrates a handheld power tool according to some embodiments.

DETAILED DESCRIPTION

Aspects of the present invention will now be described more fully. Like numbers refer to like elements throughout. Well-known functions or constructions will not necessarily be described in detail for brevity and/or clarity.

Fig. 1 illustrates a power tool tank assembly 1 according to some embodiments. The power tool tank assembly 1 is configured to accommodate a liquid in a handheld power tool, as is further explained herein. Therefore, the power tool tank assembly 1 may also be referred to as a handheld power tool tank assembly 1 . However, for the reason of brevity and clarity, the power tool tank assembly 1 is in some places herein referred to as the tank assembly 1. The tank assembly 1 comprises a tank 2. The tank 2 comprises a refill opening 4 and an inner volume 5 for accommodating the liquid. According to the illustrated embodiments, the tank 2 is a fuel tank configured to accommodate fuel, such as petrol. According to further embodiments, the tank as referred to herein may be configured to accommodate another type of liquid, such as oil, which is further explained herein. The tank assembly 1 comprises a closure device 7 for closing the refill opening 4.

Fig. 2 illustrates a perspective view of a closure device 7 according to the embodiments illustrated in Fig. 1. Below, simultaneous reference is made to Fig. 1 and Fig. 2. As can be seen in Fig. 2, the closure device 7 comprises a light emitting device 9. The light emitting device 9 is configured to illuminate at least part of the inner volume 5 of the tank 2. According to the illustrated embodiments, the walls of the tank 2 enclosing the inner volume 5 are formed by a partially transparent material. In this manner, at least part of the inner volume 5 of the tank 2 is visually checkable from outside of the tank 2. According to further

embodiments, at least a portion 1 1 of the tank 2 is at least partially transparent so that at least part of the inner volume 5 of the tank 2 is visually checkable from outside of the tank 2 via the at least portion 1 1 of the tank 2. According to some embodiments, the walls of the tank 2, and/or the portion 1 1 thereof, may comprise an at least partially transparent polymeric material. Moreover, according to some embodiments, the tank 9 may comprise an at least partially transparent portion in the form of an inspection window so that at least part of the inner volume 5 of the tank 2 is visually checkable from outside of the tank 2 via the inspection window of the tank 2. Such an inspection window may for example be provided in an at least partially transparent polymeric material, or an at least partially transparent other type of material, such as glass.

Due to these features, a tank assembly 1 is provided allowing a user to inspect the amount of liquid in the tank 2 in a quicker, simpler, and more reliable manner also in case of poor visibility conditions. This because the light emitting device 9 is configured to illuminate at least part of the inner volume 5 of the tank 2 which facilitates visual inspection of the amount of liquid in the tank 2 via the at least portion 1 1 of the tank 2.

According to the embodiments illustrated in Fig. 1 and Fig. 2, the closure device 7 comprises a movable member 6. The movable member 6 comprises a grip portion 3. As is further explained herein, the movable member 6 is movable between a retracted position and a protruding position, in which protruding position the grip portion 3 extends outwardly of a body portion 20 of the closure device to form a grip and thereby assist in loosening and tightening the closure device 7 to and from the refill opening 4. In Fig. 1 and Fig. 2, the movable member 6 is illustrated in the retracted position.

Fig. 3 illustrates an exploded view of the closure device 7 according to the embodiments illustrated in Fig. 1 and Fig. 2. As indicated in Fig. 2 and 3, the closure device 7 comprises a body portion 20 for engagement with the refill opening 4 indicated in Fig. 1. The body portion 20 is provided with threads 22. The threads 22 of the closure device 7 are configured to match and engage with threads of the refill opening 4 of the tank 2 so as to close the refill opening 4 and lock the closure device 7 to the refill opening 4. According to further embodiments, the closure device 7 may comprise another type of mechanical attachment than threads for closing the refill opening 4 and mechanically locking the closure device 7 to the refill opening 4, such as a bayonet mount, or the like. Moreover, the closure device 7 comprises a seal 24 configured to seal the area between the closure device 7 and the refill opening 4 when the closure device 7 is mounted to the refill opening 4, as is illustrated in Fig. 1 .

According to the illustrated embodiments, the closure device 7 comprises printed circuit board 25 (PCB) onto which the light emitting device 9 is arranged. Moreover, according to the illustrated embodiments, the closure device 7 comprises two batteries 13 configured to supply electricity to the light emitting device 9. According to further embodiments, the closure device 7 may comprise another number of batteries, such as one, three, four, or the like.

Moreover, according to the illustrated embodiments, the closure device 7 comprises a cover 26 configured to be attached to the body portion 20. The batteries 13 and the printed circuit board 25, containing the light emitting device 9, are configured to be arranged inside an enclosed volume formed by the cover 26 and the body portion 20 when the closure device 7 is in an assembled state.

As can be seen in Fig. 3, the closure device 7 comprises a switch 15 for activating and deactivating the light emitting device 9. Moreover, the closure device 7 comprises a pivot shaft 28. The pivot shaft 28 is configured to extend through apertures 32 provided in the body portion 20 and through apertures 34 provided in the movable member 6 such that the movable member 6 is pivotal about a pivotal axis and pivotally connected to the body portion 20 for movement between the retracted position and the protruding position.

Furthermore, the closure device 7 comprises a resilient member 36 connected to the movable member 6 and to the body portion 20 when the closure device 7 is in an assembled state. According to the illustrated embodiments, the resilient member 36 is arranged such that the movable member 6 can be displaced to a threshold position between the retracted position and the protruding position in which threshold position the resilient member 36 can hold the movable member 6. When the movable member 6 is between the threshold position and the protruding position, the resilient member 36 urges the movable member 6 towards the protruding position. Thus, even a small turning of the movable member 6 from the threshold position towards the protruding position urges the movable member 6 towards the protruding position. Similarly, if the movable member 6 is moved passed the threshold position towards the retracted position, the resilient member 36 will urge the movable member 6 towards the retracted position.

According to further embodiments, the closure device 7 may comprise a resilient member urging the movable member 6 towards the retracted position regardless of the position of the movable member 6. According to such embodiments, the closure device 7 may comprise a snap arrangement allowing a user to snap the movable member in the protruding position so as to avoid movement of the movable member 6 from the protruding position by the force of the resilient member. According to still further embodiments, the closure device 7 may comprise a resilient member urging the movable member 6 towards the protruding position regardless of the position of the movable member 6. According to such embodiments, the closure device 7 may comprise a snap arrangement allowing a user to snap the movable member 6 in the retracted position so as to avoid movement of the movable member 6 from the retracted position by the force of the resilient member. In all these embodiments, the resilient member 36 may be a spring, such as a pressure spring or a conical pressure spring.

Fig. 4 illustrates a cross section of a closure device 7 according to the embodiments illustrated in Fig. 1 - Fig. 3, in an assembled state and in which the movable member 6 is illustrated in the retracted position. In Fig. 4, the pivotal axis ax is indicated around which the movable member 6 is pivotal and pivotally connected to the body portion 20 for movement between the retracted position and the protruding position. According to the illustrated embodiments, as is further explained herein, the switch 15 is operably connected to the movable member 6.

Fig. 5 illustrates the cross section of the closure device 7 illustrated in Fig. 4, with the movable member 6 illustrated in the protruding position. According to the illustrated embodiments, the switch 15 is operably connected to the movable member 6 in a manner such that the switch 15 activates the light emitting device 9 when the movable member 6 is in the protruding position and deactivates the light emitting device 9 when the movable member 6 is in the retracted position. As can be seen in Fig. 5, a portion 6’ of the movable member 6 is abutting against the switch 15 when the movable member 6 is in the protruding position. In this manner, the switch 15 activates the light emitting device 9 when the movable member 6 is in the protruding position. As can be seen in Fig. 4, the portion 6’ of the movable member 6 is displaced away from the switch 15 when the movable member 6 is in the retracted position. In this manner, the switch 15 deactivates the light emitting device 9 when the movable member 6 is in the retracted position.

As mentioned above, the movable member 6 includes a grip portion 3. As best seen in Fig.

5, when the movable member 6 is in the protruding position, the grip portion 3 extends outwardly of the body portion 20 to form a grip and thereby assist in loosening and tightening the closure device 7. Thus, due to the features of the closure device 7, the movable member 6 serves two functions, namely facilitating loosening and tightening the closure device 7 and activating and deactivating the light emitting device 9. Fig. 6 illustrates a closure device 7 according to some further embodiments. The closure device 7 according to the embodiments illustrated in Fig. 6 comprises the same features, functions, and advantages as the closure device 7 according to the embodiments illustrated in Fig. 1 - Fig. 5, with some exceptions explained below. Some components of the closure device 7 are schematically indicated in Fig. 6, such as the batteries 13 and the switch 15. According to the embodiments illustrated in Fig. 6, the closure device 7 comprises a grip portion 3 being rigidly mounted to the body portion 20 of the closure device 7, i.e. mounted in a non-movable manner in relation to the body portion 20. The closure device 7 according to the embodiments illustrated in Fig. 6 comprises a button 17 operably connected to the switch 15 in a manner such that the switch 15 activates the light emitting device 9 when the button 17 is pressed and deactivates the light emitting device 9 when the button 17 is not pressed. The closure device 7 may comprise a mechanical linkage 38 connecting the button 17 to the switch 15. Moreover, the button 17 may be biased by a resilient member towards an unactuated position, i.e. non-pressed position. Such a resilient member is not illustrated in Fig. 6 for the reason of brevity.

According to the embodiments illustrated in Fig. 6, as well as the embodiments illustrated in Fig. 1 - Fig. 5, the light emitting device 9 comprises a light emitting diode (LED). In this manner, an energy efficient light emitting device 9 is provided ensuring a low consumption of energy from the batteries 13. According to further embodiments, the light emitting device 9 may comprise another type of light emitting device, such as a lamp.

Moreover, according to the embodiments illustrated in Fig. 6, as well as the embodiments illustrated in Fig. 1 - Fig. 5, the closure device 7 comprises a lens 40 arranged to scatter the light emitted by the light emitting device 9 to a great proportion of the inner volume of the tank. The lens 40 of the closure device 7 according to embodiments explained with reference to Fig. 1 - Fig. 5 is indicated in Fig. 2. According to these embodiments, the lens 40 is further arranged to seal the area formed by the cover 26 and the body portion 20 and is configured to hinder liquid from entering this area. Moreover, according to these embodiments, the lens 40 is arranged to scatter the light emitted by the light emitting device 9 evenly around an axis coinciding with an insertion direction of the closure device 7 into the refill opening. In this manner, a great proportion of the inner volume of the tank is illuminated by the light emitting device 9.

Moreover, according to the embodiments illustrated in Fig. 6, as well as the embodiments illustrated in Fig. 1 - Fig. 5, the light emitting device 9 of the closure device 7 may be configured to emit light having a dominant wavelength of approximately 590 - 740 nanometres. Light having a dominant wavelength of approximately 590 - 625 nanometres is usually referred to as orange light and light having a dominant wavelength of approximately 625 - 740 nanometres is usually referred to as red light. Studies have shown that light having these dominant wavelengths is particular efficient in facilitating visual inspection of the amount of liquid in a tank of a power tool tank assembly. Accordingly, due to these features, a closure device 7 is provided allowing a user to inspect the amount of liquid in the tank in a further quicker, simpler, and more reliable manner. According to further embodiments, the light emitting device 9 of the closure device 7 may be configured to emit light having another wavelength in the visible spectrum, i.e. light having a dominant wavelength of approximately 380 to 590 nanometres.

According to further embodiments of the present disclosure, the closure device 7 may comprise a light emitting device 9, and/or a lens 40, directing light towards a particular area of the tank. According to such embodiments, the light emitting device 9, and/or the lens 40, may be arranged such that more light is directed in a particular angular interval relative to the axis coinciding with the insertion direction of the closure device 7 into the refill opening, than what is directed in angles outside of the particular angular interval. According to such embodiments, the light emitting device 9, and/or the lens 40, may be arranged in a section of the closure device 7 which can be turned relative the body portion 20 of the closure device 7 so as to allow a user to select an area of the inner volume of the tank to be illuminated. Moreover, according to these embodiments, the closure device 7 may comprise a locking device, such as a screw, allowing a user to lock the section of the closure device 7 containing the light emitting device 9, and/or the lens 40, in a particular angular position relative the body portion 20. In this manner, a user can select an area of the inner volume of the tank to be illuminated and lock the section of the closure device 7 containing the light emitting device 9, and/or the lens 40, in this angular position relative the body portion 20.

Fig. 7 illustrates a closure device 7, according to some further embodiments, in a

disassembled state. According to the embodiments illustrated in Fig. 7, the closure device 7 comprises a main part 51 , a middle part 52, and a top part 53. The main part 51 comprises a body portion 20 provided with threads 22, a seal 24, and a movable member 6 comprising a grip portion 3. The movable member 6 is movable relative the body portion 20 between a retracted position and a protruding position, in which protruding position the grip portion 3 extends outwardly of a body portion 20 of the closure device 7 to form a grip and thereby assist in loosening and tightening the closure device 7 to and from a refill opening of a tank of a power tool tank assembly. In Fig. 7, the movable member 6 is illustrated in the retracted position. The body portion 20, the seal 24, the threads 22, and the movable member 6 may comprise the same features, functions, and advantages as the body portion 20, the threads 22, and the movable member 6 according to the embodiments explained with reference to Fig. 1 - Fig. 5.

The middle part 52 comprises a transparent body portion 55. Moreover, the middle part 52 comprises a light emitting device 9 and a number of batteries 13 configured to supply electricity to the light emitting device 9. The light emitting device 9 and the number of batteries 13 are arranged inside the transparent body portion 55. As can be seen in Fig. 7, the main part 51 comprises a threaded pin 54 attached to the body portion 20.

The top part 53 comprises a mounting portion 57 comprising inner treads matching the threads of the threaded pin 54.

Fig. 8 illustrates the closure device 7, according to the embodiments illustrated in Fig. 7, in an assembled state. Below, simultaneous reference is made to Fig. 7 and Fig. 8. The closure device 7 is assembled by inserting the threaded pin 54 through an aperture 56 of the middle part 52 and by screwing the top part 53 onto the threaded pin 54. As indicated in Fig. 7 and Fig. 8, the top part 53 comprises a surface structure 59 facilitating rotation and screwing of the top part 53 by increasing friction between the top part 53 and fingers of a user. According to the illustrated embodiments, the surface structure 59 comprises a number of recesses provided around a circumference of the top part 53.

In Fig. 8, a centre axis ax1 of the closure device 7 is indicated. The centre axis ax1 coincides with an insertion direction d of the closure device 7 into a refill opening of a tank of a power tool tank assembly. According to the embodiments illustrated in Fig. 7 and Fig. 8, the light emitting device 9, is arranged such that more light is directed in a particular angular interval relative to the centre axis ax1 of the closure device 7, than what is directed in angles outside of the particular angular interval. Moreover, according to the embodiments illustrated in Fig. 7 and Fig. 8, the middle part 52 is rotatable around the centre axis ax1 of the closure device 7 relative to the main part 51 , at least when the closure device 7 is in an at least partially assembled state. In this manner, a user may rotate the middle part 52 relative to the main part 51 so as to select a part of the inner volume of a tank of a power tool tank assembly to be illuminated when the closure device 7 is mounted to the refill opening of the tank. According to the embodiments illustrated in Fig. 7 and Fig. 8, the closure device 7 comprises a switch operably connected to movable member 6 in a manner such that the switch activates the light emitting device 9 when the movable member 6 is in the protruding position and deactivates the light emitting device 9 when the movable member 6 is in the retracted position. The switch of the closure device 7 is not illustrated in Fig. 7 and Fig. 8 for the reason of brevity and clarity. According to further embodiments, the closure device 7 according to embodiments illustrated in Fig. 7 and Fig. 8 may comprise a button operably connected to the switch, as explained with reference to Fig. 6.

Fig. 9 illustrates a handheld power tool 30, according to some embodiments. According to the illustrated embodiments, the handheld power tool 30 is a chainsaw. According to further embodiments of the present disclosure, the power tool 30, as referred to herein may be another type of handheld and/or portable power tool, such as a cutting tool, a hedge trimmer, a garden tool, a rotary tool, a reciprocating tool, a multi tool, a leaf blower, or the like.

The handheld power tool 30 comprises a tank assembly 1 according to the embodiments illustrated in Fig. 1 . Moreover, according to the illustrated embodiments, the handheld power tool 30 comprises a second tank assembly T according to some further embodiments. The second tank assembly 1’ comprises a tank 2’. The tank 2’ comprises a refill opening 4 and an inner volume 5 for accommodating a liquid. According to the illustrated embodiments, the tank 2’ of the second tank assembly T is an oil tank configured to accommodate oil for lubricating a bar 44 and a chain 46 of the handheld power tool 30. Moreover, as can be seen in Fig. 9, the second tank assembly 1’ comprises a closure device 7 according to the embodiments illustrated in Fig. 1 - Fig. 5. According to the illustrated embodiments, the walls of the tank 2’ enclosing the inner volume 5 are formed by a partially transparent material. In this manner, at least part of the inner volume 5 of the tank 2’ is visually checkable from outside of the tank 2’ and a user of the handheld power tool 30 can utilize the light emitting device of the closure device 7 to illuminate the inner volume 5 so as to inspect the amount of oil in the tank 2’ in a quick, simple, and more reliable manner also in case of poor visibility conditions.

The tank 2’ and the closure device 7 of the second tank assembly 1’ may comprise the same features, functions, and advantages as the tank 2 and the closure device 7 of the tank assembly 1 explained with reference to Fig. 1 - Fig. 9. Therefore, these components are not further explained herein. It is to be understood that the foregoing is illustrative of various example embodiments and that the invention is defined only by the appended claims. A person skilled in the art will realize that the example embodiments may be modified, and that different features of the example embodiments may be combined to create embodiments other than those described herein, without departing from the scope of the present invention, as defined by the appended claims.

As used herein, the term "comprising" or "comprises" is open-ended, and includes one or more stated features, elements, steps, components, or functions but does not preclude the presence or addition of one or more other features, elements, steps, components, functions, or groups thereof.

Claims

1. A power tool tank assembly (1 , 1’) comprising:

- a tank (2, 2’) with a refill opening (4) and an inner volume (5) for accommodating a liquid, and

- a closure device (7) for closing the refill opening (4),

and wherein the closure device (7) comprises a light emitting device (9) configured to illuminate at least part of the inner volume (5) of the tank (2, 2’).

2. The tank assembly (1 , T) according to claim 1 , wherein at least a portion (1 1 ) of the tank (2, 2’) is at least partially transparent so that at least part of the inner volume (5) of the tank (2, 2’) is visually checkable from outside of the tank (2, 2’) via said at least portion

(1 1 ) of the tank (2, 2’).

3. The tank assembly (1 , T) according to claim 1 or 2, wherein the closure device (7)

comprises one or more batteries (13) configured to supply electricity to the light emitting device (9).

4. The tank assembly (1 ) according to any one of the preceding claims, wherein the tank (2) is a fuel tank.

5. The tank assembly (1’) according to any one of the claims 1 - 3, wherein the tank (2’) is an oil tank.

6. The tank assembly (1 , T) according to any one of the preceding claims, wherein the closure device (7) comprises a switch (15) for activating and deactivating the light emitting device (9).

7. The tank assembly (1 , T) according to claim 6, wherein the closure device (7) comprises a button (17) operably connected to the switch (15).

8. The tank assembly (1 , T) according to claim 6, wherein the closure device (7) comprises

- a body portion (20) for engagement with said refill opening (4), and

- a movable member (6) including a grip portion (3), which movable member (6) is moveably connected to said body portion (20) for movement between a retracted position and a protruding position, in which protruding position said grip portion (3) extends outwardly of said body portion (20) to form a grip and thereby assist in loosening and tightening the closure device (7), and wherein the switch (15) is operably connected to the movable member (6).

9. The tank assembly (1 , T) according to claim 8, wherein the switch (15) is operably

connected to the movable member (6) in a manner such that the switch (15) activates the light emitting device (9) when the movable member (6) is in the protruding position and deactivates the light emitting device (9) when the movable member (6) is in the retracted position.

10. The tank assembly (1 , T) according to claim 8 or 9, wherein the movable member (6) is pivotal about a pivotal axis (ax) and pivotally connected to said body portion (20) for movement between the retracted position and the protruding position.

1 1. A closure device (7) configured to close a refill opening (4) of a tank (2, 2’) of a power tool tank assembly (1 , T) according to any one of the preceding claims, wherein the closure device (7) is a closure device (7) according to any one of the claims 8 -10.

12. The closure device (7) according to claim 1 1 , wherein the light emitting device (9) of said closure device (7) is configured to emit light having a dominant wavelength of approximately 590 - 740 nanometres.

13. A handheld power tool (30) comprising a tank assembly (1 , T) according to any one of the claims 1 - 10.

14. The handheld power tool (30) according to claim 13, wherein the handheld power tool (30) is a chainsaw.