Device for applying a liquid or semi-paste substance on a surface

A device for applying a liquid or semi-paste substance on a surface, comprising a hermetically sealed refill (1), containing said substrate and removably disposed within a body (5) which is intended to be manipulated by hand, said device having at one end a head (7) for application of said substance which is removably fixed at said end, means (9) for putting said application head (7) into communication with the interior of the refill (1), said application head having means (10, 11) for preventing discharge of the substance as long as said head is not applied on the surface, the other end of the body (5) having closure means (12), the refill (1) being sealed-off at its end remote from the application head (7) by a capsule (4) of perforatable material, said closure means (12) for the body (5) carrying a hollow needle (22) which is capable of perforating said capsule (4), said capsule (4) being made from a material such that a leak-tight sealing is provided when it is perforated by said needle when the refill is placed within said body (5), said hollow needle (22) communicating with air pressurization mans (17) which can be actuated by hand and which is carried by said closure means (12), means (19, 20) for closing the communication between the hollow needle (22) and said pressurization means after release of said pressurization means, said pressurization means comprising a manually-actuated mini-pump (17) having a non-return valve (19), said mini-pump generating and maintaining on the downstream side of said valve (19) air under pressure to ensure good flow of the substance, there being a cavity (14) between the non-return valve (19) and the hollow needle (22), said non-return valve (19) being constituted by a resilient washer having a small slit and a periphery, said cavity (14) having a bottom provided with a hole (15) communicating with said mini-pump (17), said washer being applied against said bottom, said hollow needle (22) being mounted in a hollow needle-holder (21) which is screwed into said cavity (14), said hollow needle-holder (21) having a circular end lip applied against the periphery of said washer.