The guide groove mechanism (32) comprises a guide groove (34), a first guiding portion and a second guiding portion which are arranged on the guide groove (34) and are positioned on different sides of the guide groove (34).

A first guiding groove (4), a second guiding groove (5) and a third guiding groove (6) are provided on the first triangular guide.

The guide block (9) penetrates through the guide groove (8) and extends into the guide spiral groove (7).

A hardened layer (S1) is formed in the track groove (22) of the outer coupling member from the back side of the track groove to the opening end of the track groove.

The guide groove includes a plurality of sections.

In the inner wall of the position sleeve is there a guiding rib which is embeded into the guiding groove.

The middle of the guide strips (31, 32) forms a guide groove and the window sashes (2) are placed in the guide groove.

At the center of the guide groove (6), a rib section (7) rising from the bottom side of the guide groove (6) to the middle portion of the guide groove is provided.

The guiding groove can be placed inside a guiding body (15) with the groove opening being oriented downward.

The guide groove (52) and the guide groove (57) differ from each other at least in either width or depth.

The first guide groove (36) is connected via a curved portion (40') to the lower end of the second guide groove (40).

The guide groove (100) is formed in a bow-shape.

The tracheal cannula guiding groove (109) is an arc-shaped tracheal cannula guiding groove provided on the laryngoscope blade.

A guide groove 14 promotes uniformity of spooling.

The arrangement of the guide element relative to the guide groove may be such that the guide element secures itself in the guide groove as pressure builds up in the interior of the brewing chamber.