Thin film dispenser

Abstract

A thin film dispenser has a housing and a dispensing unit mounted in the housing. The housing has an upper casing, a lower casing and an engagement device. The upper casing has a first end, a length and an inner surface. The lower casing is combined with the upper casing to define a chamber between the lower casing and the upper casing, and the lower casing has an end, a length and an inner surface. The end of the lower casing is pivotally connected with the first end of the upper casing. The length of the lower casing is longer than that of the upper casing. The inner surface of the lower casing faces to and is spaced from the inner surface of the upper casing. The engagement device is disposed on the inner surfaces of the upper casing and the lower casing.

What is claimed is: 
     
         1 . A thin film dispenser comprising:
 a housing comprising
 an upper casing having
 a first end; 
 a length; and 
 an inner surface; 
 
 a lower casing combined with the upper casing to define a chamber between the lower casing and the upper casing, and the lower casing having
 an end pivotally connected with the first end of the upper casing; 
 a length being longer than that of the upper casing; and 
 an inner surface facing to and spaced from the inner surface of the upper casing; and 
 
 an engagement device disposed on the inner surfaces of the upper casing and the lower casing; and 
   a dispensing unit mounted in the chamber in the housing.   
     
     
         2 . The thin film dispenser as claimed in  claim 1 , wherein the engagement device comprises
 an upper engaging tab formed on the upper casing; and   a lower engaging tab formed on the lower casing and engaging the upper engaging tab.   
     
     
         3 . The thin film dispenser as claimed in  claim 2 , wherein
 the upper casing has a second end opposite to the first end of the upper casing;   the upper engaging tab is formed on the second end of the upper casing and extends toward the lower casing;   the lower casing has an inner bottom facing the upper casing; and   the lower engaging tab is formed on the inner bottom of the lower casing at a position corresponding to the upper engaging tab.   
     
     
         4 . The thin film dispenser as claimed in  claim 3 , wherein the lower engaging tab is formed near a middle of a central line of the lower casing. 
     
     
         5 . The thin film dispenser as claimed in  claim 4 , wherein the upper engaging tab and the lower engaging tab are resilient. 
     
     
         6 . The thin film dispenser as claimed in  claim 5 , wherein the dispensing unit has a body and a through hole defined through the body and corresponding to the upper engaging tab and the lower engaging tab. 
     
     
         7 . The thin film dispenser as claimed in  claim 6 , wherein
 the upper casing further has a finger tab formed on and extending horizontally from the second end on a top of the upper casing; and   the body of the dispensing unit further has a finger recess defined in a top of the body and corresponding to the finger tab of the upper casing to allow the finger tab to extend slightly into the finger recess.   
     
     
         8 . The thin film dispenser as claimed in  claim 7  further comprising a positioning device disposed between the body of the dispensing unit and the housing. 
     
     
         9 . The thin film dispenser as claimed in  claim 8 , wherein the positioning device comprises
 two positioning tabs formed respectively on two sides of the body of the dispensing unit; and   two positioning recesses defined in the lower casing and respectively engaging the positioning tabs.   
     
     
         10 . The thin film dispenser as claimed in  claim 9 , wherein the positioning recesses are defined respectively in two inner side surfaces of the lower casing. 
     
     
         11 . The thin film dispenser as claimed in  claim 10 , wherein
 each positioning recess has two ends and two guiding blocks formed respectively on the ends of the positioning recess; and   each guiding block has a top and an inclined surface formed on the top of the guiding block.   
     
     
         12 . The thin film dispenser as claimed in  claim 11 , wherein the lower casing further has two buffering recesses defined respectively in two edges of the lower casing and being respectively adjacent to the positioning recesses. 
     
     
         13 . The thin film dispenser as claimed in  claim 1 , wherein the dispensing unit has a body and a through hole defined through the body and corresponding to the engagement device. 
     
     
         14 . The thin film dispenser as claimed in  claim 1 , wherein
 the upper casing further has a finger tab formed on and extending horizontally from a top of the upper casing at an end on which the engagement device is mounted; and   the dispensing unit further has a finger recess defined in a position corresponding to the finger tab of the upper casing to allow the finger tab to extend slightly into the finger recess.   
     
     
         15 . The thin film dispenser as claimed in  claim 1  further comprising a positioning device disposed between the dispensing unit and the housing. 
     
     
         16 . The thin film dispenser as claimed in  claim 15 , wherein the positioning device comprises
 two positioning tabs formed respectively on two sides of the dispensing unit; and   two positioning recesses defined in the lower casing and respectively engaging the positioning tabs.   
     
     
         17 . The thin film dispenser as claimed in  claim 16 , wherein the positioning recesses are defined respectively in two inner side surfaces of the lower casing. 
     
     
         18 . The thin film dispenser as claimed in  claim 17 , wherein
 each positioning recess has two ends and two guiding blocks formed respectively on the ends of the positioning recess; and   each guiding block has a top and an inclined surface formed on the top of the guiding block.   
     
     
         19 . The thin film dispenser as claimed in  claim 18 , wherein the lower casing further has two buffering recesses defined respectively in two edges of the lower casing and being respectively adjacent to the positioning recesses.