The ornamental design for a rotarydamper for hinges, as shown and described.
1. Rotary damper for hinges
1.1 : Perspective
1.2 : Front
1.3 : Left
1.4 : Right
1.5 : Top
1.6 : Sectional view taken along line “A-A” in 1.4
The design is a rotary damper that contains a shaft inside a housing; the design is characterized by an outer periphery of the end portion of the housing that has the triangular-shaped grooves allowing the product to be easily attached to a toilet unit, etc.; the back view is omitted because the back view is identical with the front view; the bottom view is omitted because the bottom view is identical with the top view; fig. 1.6 is a sectional view taken along line “A-A” of fig. 1.4 by cutting off the product without the shaft; thin lines in the representation represent contours only and do not illustrate an ornamentation or decoration on the surface of the product.