Method and device for making a hole in a golf green

A device (30) for making a hole in a golf green (100), the device (30) having a longitudinal direction (L), a radial direction (R) and an angular direction (A), the device (30) comprising:

• a cutting cylinder (4) with an axis parallel to the longitudinal direction (L) and an open end being freely movable along the longitudinal direction (L);
• a structure, comprising guide means (1) defining a weight path having a first endpoint and a second endpoint;
• a weight (5), in engagement with said guide means (1) to be guidedly movable along said weight path;
• a hydraulically driven weight propulsion device, arranged to propel the weight (5) reciprocally along said weight path between said first endpoint and said second endpoint so that the weight (5) strikes against the cutting cylinder (4) when the weight (5) is at a location along said weight path, in turn urging the cutting cylinder (4) in the longitudinal direction (L);
• a soil expulsion piston (9), movable inside said cutting cylinder (4) along said longitudinal axis;
• a piston driving mechanism, arranged to transfer a hydraulic force, provided by said weight propulsion device, to the soil expulsion piston (9) to drive the soil expulsion piston (9) in a direction towards said open end of the cutting cylinder (4);
• and
• an expulsion activating mechanism, activatable to switch between a first mode of operation of the device (30) and a second mode of operation of the device (30), the device (30) in the first mode of operation being operable for driving the cutting cylinder (4) down into the soil by the weight (5) repeatedly striking onto the cutting cylinder (4), the device (30) in the second mode of operation being operable for expelling a cut soil cylinder out from the cutting cylinder (9) by allowing the same driving mechanism that drives the weight (5) to push the soil expulsion piston (9) to expel the soil cylinder, the switching being effected by the expulsion activating mechanism engaging and disengaging, respectively, the piston driving mechanism in relation to the weight propulsion device.