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A handle height adjustment device of a handle assembly (2) of a walk-behind power tool (1). The handle height adjustment device (100) comprises a first toothed disk member (200), a second toothed disk member (300), and a disk interconnecting member. The disk interconnecting member (400) is arranged

A handle height adjustment device of a handle assembly (2) of a walk-behind power tool (1). The handle height adjustment device (100) comprises a first toothed disk member (200), a second toothed disk member (300), and a disk interconnecting member. The disk interconnecting member (400) is arranged to be connected to the first toothed disk member (200) by means of a first interconnection mechanism (401), which first interconnection mechanism (401) inhibits relative movement between the disk interconnecting member (400) and the first toothed disk member (200) along an axis of rotation (500) of the handle height adjustment device (100), and which first interconnection mechanism (401) allows the disk interconnecting member to rotate relative the first toothed disk member about the axis of rotation (500). The disk interconnecting member (400) is arranged to be threadably connected to the second toothed disk member (300) by means of a second interconnection mechanism (402). The application also concerns a handle assembly and a walk-behind power tool comprising such a device.

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1. A handle height adjustment device of a handle assembly of a walk behind power tool, the handle height adjustment device comprising: a first toothed disk member arranged to be affixed to a first arm element of the handle assembly,a second toothed disk member arranged to be affixed to a second arm

1. A handle height adjustment device of a handle assembly of a walk behind power tool, the handle height adjustment device comprising: a first toothed disk member arranged to be affixed to a first arm element of the handle assembly,a second toothed disk member arranged to be affixed to a second arm element of the handle assembly,a disk interconnecting member extending along an axis of rotation of the handle height adjustment device, the disk interconnecting member being operable to move the handle height adjustment device between a locked state in which the first and second toothed disk members intermesh, and an open state in which the first toothed disk member is rotatable relative to the second toothed disk member about the axis of rotation,wherein rotation of the disk interconnecting member in a first direction about the axis of rotation moves the handle height adjustment device towards the locked state, and wherein rotation of the disk interconnection member in a second direction, opposite to the first direction, moves the handle height adjustment device towards the open state, characterized in that the disk interconnecting member is arranged to be connected to the first toothed disk member by means of a first interconnection mechanism, which first interconnection mechanism inhibits relative movement between the disk interconnecting member and the first toothed disk member along the axis of rotation, and which first interconnection mechanism allows the disk interconnecting member to rotate relative the first toothed disk member about the axis of rotation, and in that;the disk interconnecting member is arranged to be threadably connected to the second toothed disk member by means of a second interconnection mechanism. 2. A handle height adjustment device according to claim 1, wherein the first interconnection mechanism comprises a snap-fit connection. 3. A handle height adjustment device according to claim 1, wherein the second interconnection mechanism comprises male threads provided on a portion of the disk interconnecting member, and corresponding female threads provided in a hole of the second toothed disk member. 4. A handle height adjustment device according to claim 1, wherein the disk interconnecting member is affixed to a knob. 5. A handle height adjustment device according to claim 4, wherein the disk interconnecting member and the knob are integrally formed. 6. A handle height adjustment device according to claim 1, wherein the first toothed disk member is integrally formed with the first arm element. 7. A handle height adjustment device according to claim 1, wherein the second toothed disk member is integrally formed with the second arm element of the handle assembly. 8. A handle height adjustment device according to claim 1, wherein the first toothed disk member and the first arm element are made from a plastic material. 9. A handle height adjustment device according to claim 1, wherein the second toothed disk member and the second arm element are made from a plastic material. 10. A handle assembly of walk behind power tool, the handle assembly comprising a handle height adjustment device according to claim 1. 11. A handle assembly of claim 10, wherein the handle assembly comprises two handle height adjustment devices, and wherein axes of rotation of the handle height adjustment devices coincides. 12. A handle assembly according to claim 11, wherein the disk interconnecting members of the handle height adjustment devices are integrally formed. 13. A walk behind power tool comprising a handle assembly according to claim 10.