Abstract: Wheel cover for trolleys preferably for domestic use, which includes a protection cover made up of an external body of ring shape, internally concave and including with at least one lateral opening and fitted with an arrangement that allows the dilation of the opening for the mounting and removal of the wheel cover on/from the wheel to be protected, as well as contracting said opening in order to obtain the stable mounting of the wheel cover it on the wheel during movement of the trolley.

Abstract: The syringe according to the invention comprises elastic means for blocking the intake stroke of the plunger which are initially located in an inactive position and are transferred into an active position during the first syringe intake and injection operation. When in said active position the elastic means are disposed in a position secured to the cylindrical body of the syringe and interfering with the intake stroke of the plunger.The syringe of the invention also comprises a slidable cap coaxial to the syringe body and covering the body itself, and being provided at its front with an exit hole for the needle and having members for its fastening to the syringe body, and elastic thrust means. The cap when in its retracted position leaves the needle exposed and when in its advanced position covers the needle, the fastening members being moved into their released position by elastic means on the first forward movement of the plunger.