A trimmer height adjustment mechanism (103) having a forward guard (105a); a forward spacer (112b); and an arm (109). Such trimmer height adjustment mechanism allows a string trimmer user to: (a) achieve a uniform, user-selected cutting height for groundcover; and (b) readily engage/disengage the height adjustment mechanism so that the user can change between a uniform height setting (e.g., while cutting even terrain) and an ordinary string trimmer operation (i.e., when a user is not concerned about the height of the groundcover being cut or wishes to cut as short a height as possible, e.g., while cutting grass around the base of a tree).

An electric working machine may include a support rod, a head unit, a position fixing mechanism, and a resistance member. The support rod may extend in a front-rear direction and include an attachment portion located at a front end of the support rod. The head unit may include a front tool, a motor configured to drive the front tool, and a head housing supporting the front tool and coupled to the attachment portion rotatably about a rotation axis. The position fixing mechanism may be configured to fix a rotation position of the head unit with respect to the support rod. The resistance member may be interposed between the attachment portion and the head housing with respect to a direction perpendicular to the rotation axis. The resistance member may be configured to provide a resistance force against rotation of the head unit with respect to the support rod.

An electric working machine may include a support rod, a head unit, a position fixing mechanism, and a resistance member. The support rod may extend in a front-rear direction and include an attachment portion located at a front end of the support rod. The head unit may include a front tool, a motor configured to drive the front tool, and a head housing supporting the front tool and coupled to the attachment portion rotatably about a rotation axis. The position fixing mechanism may be configured to fix a rotation position of the head unit with respect to the support rod. The resistance member may be interposed between the attachment portion and the head housing with respect to a direction perpendicular to the rotation axis. The resistance member may be configured to provide a resistance force against rotation of the head unit with respect to the support rod.

A plant trimming guide apparatus, including a plurality of guide blades made of a resilient material, and a flat collar having a length, a width, an attachment surface, and made of a resilient material. Each of the plurality of guide blades has a pivot end that is secured pivotably with a common securement pin, and an opposed based end, with the plurality of base ends attached to and extending from an attachment surface of the collar, in a series along the length between the first end and the second end of the collar. Securing the first and second ends of the collar into a formed ring with the attachment surface facing outwardly causes the guide blades to extend radially from the common pivot ends and bend semi-spherically to the base ends, forming a spherical trimming guide.

Mobile hedge trimmer apparatus (1000, 2000, 3000) comprising a first portion (100) acting as a mobile base adapted to advance along a path on the ground and comprising a plate (150) and at least two wheels, preferably two pairs of wheels (104a, 104b), and a second portion (200) comprising a pillar (250) adapted to tilt on two axes (A and B) perpendicular to each other; the pillar (250) comprises a first cutting blade (210) adapted to slide along the pillar (250) and a second cutting blade (220) integral with the pillar (250); a control unit (111) is adapted to adjust the inclination of the pillar (250) on the axes (A and B) and/or the position of the first cutting blade (210) along the pillar (250), the control unit (111) receiving information from sensors which comprise at least one tool for measuring an inclination and at least one movement sensor or advancement detector.

A plant trimming guide apparatus, including a plurality of guide blades made of a resilient material, and a flat collar having a length, a width, an attachment surface, and made of a resilient material. Each of the plurality of guide blades has a pivot end that is secured pivotably with a common securement pin, and an opposed based end, with the plurality of base ends attached to and extending from an attachment surface of the collar, in a series along the length between the first end and the second end of the collar. Securing the first and second ends of the collar into a formed ring with the attachment surface facing outwardly causes the guide blades to extend radially from the common pivot ends and bend semi-spherically to the base ends, forming a spherical trimming guide.

A bush pruning apparatus adapted for use in combination with a tractor or similar vehicle, wherein the apparatus is mounted to the tractor by a frame that allows the position of the cutting blade relative to the bush be pruned to be freely independent of the position or tilt of the tractor, such that changes in elevation or ground surface encountered by the tractor are not transmitted to the cutting blade to adversely affect the height of the cutting blade.

A plant trimming guide apparatus, including a plurality of guide blades made of a resilient material, and a flat collar having a length, a width, an attachment surface, and made of a resilient material. Each of the plurality of guide blades has a pivot end that is secured pivotably with a common securement pin, and an opposed based end, with the plurality of base ends attached to and extending from an attachment surface of the collar, in a series along the length between the first end and the second end of the collar. Securing the first and second ends of the collar into a formed ring with the attachment surface facing outwardly causes the guide blades to extend radially from the common pivot ends and bend semi-spherically to the base ends, forming a spherical trimming guide.

The hedger trimming carriage and apparatus is a frame that is designed to be mounted on a vehicle. The frame of the hedger trimming carriage and apparatus is designed to carry during operation a hedger that is used to trim bushes and shrubbery while the vehicle is in motion. The hedger trimming carriage and apparatus comprises a mounting frame, a first hedger apparatus, and as second hedger apparatus.

A hedge-trimming device is provided. The device is comprised of a moveable frame with at least one wheel that allows the frame to travel forward, backward, left, and right. The frame preferably has a vertical frame member comprised of at least one spinning blade that is powered by at least one motor. The blade may be positioned on the vertical frame member such that it is parallel with vertical frame member. As a result, the device can be moved left and right wherein the blade produces a straight cut along the front surface of a hedge or other greenery.