A method for installing a handle assembly on a door or window having a defined thickness, said handle assembly comprising:
- a handle suitable for installation on one side of the door or window and a second element suitable to be mounted on an opposite side of the door or window;
- a pin element having a main extension along a pin rotation axis (X) and suitable to penetrate the door or window in a hole obtained in the door or window, said pin element comprising a left end and a right end, each end being insertable in the handle or in the second element at a variable depth, said pin element being rotatable around the pin rotation axis (X) upon force exerted on the handle;
- a friction reducing group configured to reduce friction generated by a rotating movement of the handle, said friction reducing group being suitable to be coaxially arranged on the pin element and to be positioned at least between the handle and the door or window in an axial direction of the pin rotation axis (X);
- clamping devices configured to constrain the handle and/or the second element on the pin element at adjustable distances along the axial direction (X) according to the thickness of the door or window, so that when the handle assembly is installed on the door or window, an axial clamping pressure of the handle and of the second element is maintained on a respective side of the door or window,
- wherein said handle assembly is self-supporting,
- and wherein the handle and/or the second element comprise an axial body extending along a direction perpendicular to a side of the door or window when the handle assembly is installed on the door or window, a clamping chamber obtained in said axial body suitable to accommodate at least partially or entirely the friction reducing group and the clamping devices,
- said friction reducing group comprising an oblique contact ball bearing and an annular member associated with each of the handle and the second element,
- wherein the annular member comprises an outer surface upon which the oblique contact ball bearing engages and bears there against, and an opposite inner surface which is disposed upon an outer surface of the door;
- and
- wherein the handle assembly only contacts the door where the inner surface of the annular member is said disposed on the outer surface of the door
- the method comprising the steps of:
- a) providing the handle wherein the pin element is fastened to and is thereby protruding from the handle,
- b) inserting the protruding pin element in a through-hole in the door or window on one side thereof;
- c) inserting the pin element protruding from the hole on an opposite side of the door or window in a second element, performing an axial movement of approach between the handle and the second element until the door or window is encountered;
- d) actuating the clamping devices to reach a configuration of the handle assembly suitable to maintain an axial pressure of the handle and of the second element on the respective side of the door or window,
- e) wherein actuating the clamping devices involves actuating a first interfering element with the pin element as to generate an additional approach between the handle and the second element resulting in an intensity increase of the axial pressure of the second element and of the handle on the sides of the door or window,
- wherein step c) provides for engaging a second interfering element with a notched region during the axial movement of approach until a stable configuration of the interfering element on the notched region is reached,
- transferring a first portion of the axial clamping pressure in the axial direction from the oblique contact ball bearing to the annular element to secure the annular member upon the door or window;
- and
- transferring a second portion of the axial clamping pressure from the oblique contact ball bearing in a radial direction perpendicular to the axial direction.