Trigger Sprayer

Abstract

A dispenser head ( 1 ) comprises a main body ( 2 ), an arm ( 60 ) hinged to the main body ( 2 ) and pumping means. The pumping means comprise a main cylinder ( 12 ), a sliding piston ( 16 ), dispensing means sensitive to pressure. The arm ( 60 ) is hinged to the main body ( 2 ) in a hinging portion ( 60 b ) distanced radially from the body axis (X), straddling the body axis (X) and transmitting an axial translation movement to the piston ( 16 ) by means of an elastically yielding element ( 30 ).

1 . Dispenser head ( 1 ) associable with a container so as to contain a liquid for dispensing, comprising:
 a main body ( 2 ) having a body axis (X);   an arm ( 60 ) hinged to the main body ( 2 ), the arm comprising a lever ( 62 ) for activating the head;   pumping means comprising:
 i) a main cylinder ( 12 ) supported in the main body ( 2 ); 
 ii) a piston ( 16 ) sliding axially sealed in the main cylinder ( 12 ), which defines in the main cylinder a compression chamber ( 18 ); 
 iii) dispensing means sensitive to the pressure of the liquid in the compression chamber ( 18 ) able to place the compression chamber ( 18 ) in fluidic communication with the external environment via a dispensing route when the pressure of the liquid in the compression chamber exceeds a threshold dispensing pressure; wherein the arm ( 60 ) is hinged to the main body ( 2 ) in a hinging portion ( 60   b ) distanced radially from the body axis (X), straddles the body axis (X) and transmits an axial translation movement to the piston ( 16 ) by means of an elastically yielding element ( 30 ), and wherein 
   the arm ( 60 ) has a free end ( 62 ′) opposite the hinging portion ( 60   b ) with respect to body axis (X) the free end ( 62 ′) being radially distanced from the body axis (X).   
     
     
         2 . Dispenser head according to  claim 1 , wherein the free end ( 62 ′) is radially external to a collar ( 4 ) of the body ( 2 ). 
     
     
         3 . Dispenser head according to  claim 1 , wherein the hinging portion ( 60   b ) is radially external to a collar ( 4 ) of the body ( 2 ). 
     
     
         4 . Dispenser head according to  claim 1 , wherein the main body ( 2 ) comprises a branch ( 6 ) having a radial extension, at the distal extremity ( 6   b ) of which the arm is hinged ( 60 ). 
     
     
         5 . Dispenser head according to  claim 4 , wherein the distal end ( 6   b ) of the branch ( 6 ) is radially external to a collar ( 4 ) of the body ( 2 ). 
     
     
         6 . Dispenser head according to  claim 1 , wherein the arm ( 60 ) is arched with a concave section towards the main body ( 2 ). 
     
     
         7 . Dispenser head according to  claim 6 , wherein the lever ( 62 ) is convex to the body axis ((X). 
     
     
         8 . Dispenser head according to  claim 1 , wherein the arm ( 60 ) is able to transmit the axial translation movement to the piston ( 16 ) by means of a tubular stem ( 24 ). 
     
     
         9 . Dispenser head according to  claim 8 , wherein the yielding element is a first spring ( 30 ) positioned so as to be compressed between a boss ( 27 ) of the stem ( 24 ) and the piston ( 16 ). 
     
     
         10 . Dispenser head according to  claim 8 , wherein the stem ( 24 ) slides inside the piston ( 16 ) and the dispenser mechanism comprises an obturator ( 22 ) joined in translation to the stem and disengaging from the piston ( 16 ) so as to place the compression chamber ( 18 ) in fluidic communication with the outside environment when the pressure of the liquid in the compression chamber exceeds a threshold dispensing pressure. 
     
     
         11 . Dispenser head according to  claim 1 , comprising elastic return means. 
     
     
         12 . Dispenser head according to  claim 11 , wherein the elastic return means comprise a second spring ( 32 ) housed in the compression chamber, and wherein the elastically yielding element ( 30 ) has a greater resistance to compression than the resistance to compression of the second spring ( 32 ). 
     
     
         13 . Dispenser head according to  claim 1 , comprising a terminal duct ( 40 ) having a transversal section ( 44 ) for dispensing nebulised liquid along a dispensing axis (Y) incident to the body axis and wherein the terminal duct ( 40 ) protrudes from an aperture ( 64 ) of the arm ( 60 ). 
     
     
         14 . Dispenser head according to  claim 1 , comprising opening/closing means able to be handled so as to prevent/enable dispensing of the liquid to the outside. 
     
     
         15 . Dispenser head according to  claim 1 , comprising removable safety means able to mechanically block sliding of the piston. 
     
     
         16 . Dispenser head according to  claim 1 , wherein the body axis (X) is outside the hinging portion ( 60   b ). 
     
     
         17 . Dispenser head according to  claim 1 , wherein the body axis (X) is outside the free end ( 62 ′) of the arm.