Patent Publication Number: US-8523038-B2

Title: Adjusting-fixing assembly for a staple gun

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an adjusting-fixing assembly, and more particularly relates to an adjusting-fixing assembly for a staple gun that can hold an adjusting nut of the adjusting-fixing assembly securely when the staple gun is used and can provide a preferred quality of construction to the staple gun. 
     2. Description of Related Art 
     Conventional staple guns are used extensively with decorations, shoemaking and leatherwear and drives staples into objects and each conventional staple gun has an adjusting assembly mounted on a muzzle of the conventional staple gun to adjust the depth of a staple of the staple gun inserted into objects. The conventional adjusting assembly has a sliding frame, an adjusting nut and an abutting shaft. The sliding frame is movably connected to a side of the conventional staple gun, extends forward to the muzzle of the conventional staple gun and has a front end. The abutting nut is rotatably mounted on the front end of the sliding frame. The abutting shaft is U-shaped, is connected to the adjusting nut and the conventional staple gun ahead the muzzle and has two ends. One of the ends of the abutting shaft is mounted in and screwed with the adjusting nut and the other end of the abutting shaft is slidably connected to the conventional staple gun. 
     In use, before the conventional staple gun ejects staple into an object, a user can rotate the adjusting nut to enable the abutting shaft to move forward or backward relative to the muzzle of the conventional staple gun to adjust the depth of the staple of the staple gun inserted into objects or walls. When the conventional staple gun ejects a staple into an object, the abutting shaft abuts an external surface of the object to confirm the depth of the staple inserted into the object. However, the conventional staple gun will produce a vibration during the staple ejected into the object and the vibration will transmit to the adjusting nut via the abutting shaft to enable the adjusting nut to rotate relative to the abutting shaft and this will change the depth of the staple inserted into the object and cannot provide a preferred quality of construction to the staple gun. 
     To overcome the shortcomings, the present invention provides an adjusting-fixing assembly for a staple gun to mitigate or obviate the aforementioned problems. 
     SUMMARY OF THE INVENTION 
     The main objective of the present invention is to provide an adjusting-fixing assembly for a staple gun that can hold an adjusting nut of the adjusting-fixing assembly securely when the staple gun is used and can provide a preferred quality of construction to the staple gun. 
     The adjusting-fixing assembly for a staple gun having two opposite sides, a front end and a muzzle in accordance with the present invention has a sliding frame, an adjusting nut, a fixing arm and an abutting shaft. The sliding frame is movably connected to one of the opposite sides of the staple gun, extends forward to the muzzle and has a connecting board with two positioning recesses. The adjusting nut is rotatably mounted on the sliding frame and has a mounting end, a threaded end and an engaging segment. The engaging segment is formed on the adjusting nut between the threaded end and the connecting board and has multiple engaging faces. The fixing arm is rotatably connected to the sliding frame, engages with the adjusting nut and has a connecting rod, an engaging recess and a positioning element. The engaging recess is formed in an inner side of the fixing nut and engages with two adjacent engaging faces of the engaging segment. The abutting shaft is connected to the adjusting nut and is movably connected to the opposite sidewall of the staple gun that is opposite to the adjusting nut. 
     Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of an adjusting-fixing assembly for a staple gun in accordance with the present invention, shown mounted on a staple gun; 
         FIG. 2  is an exploded perspective view of the adjusting-fixing assembly and the staple gun in  FIG. 1 ; 
         FIG. 3  is an operational side view in partial section of the adjusting-fixing assembly mounted in the staple gun in  FIG. 1 ; 
         FIG. 4  is another operational side view of the adjusting-fixing assembly mounted in the staple gun in  FIG. 1 ; and 
         FIG. 5  is further operational side view in partial section of the adjusting-fixing assembly mounted in the staple gun in  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference to  FIGS. 1 to 3 , an adjusting-fixing assembly in accordance with the present invention is mounted on a staple gun  50  having two opposite sides, a front end and a muzzle  51  and the adjusting-fixing assembly comprises a sliding frame  10 , an adjusting nut  20 , a fixing arm  30  and an abutting shaft  40 . 
     The muzzle  51  is formed in the front end of the staple gun  50  to eject staples out of the staple gun  50 . 
     The sliding frame  10  is movably connected to one of the opposite sides of the staple gun  50 , extends forward to the muzzle  51  of the staple gun  50  and has a rear end, a front end and a connecting board  11 . The rear end of the sliding frame  10  is movably connected to the staple gun  50 . The front end of the sliding frame  10  extends forward to the muzzle  51  of the staple gun  50 . The connecting board  11  is formed on and protrudes from the front end of the sliding frame  10  and has an arc sidewall and two positioning recesses  111 . The positioning recesses  111  are formed on the arc sidewall of the connecting board  11  at an interval. 
     The adjusting nut  20  is rotatably mounted on the sliding frame  10  and has an external surface, a mounting end  21 , a threaded end  22 , an engaging segment  23  and a spring  24 . 
     The mounting end  21  of the adjusting nut  20  may be a cylinder, is rotatably connected to the connecting board  11  of the sliding frame  10  and extends backward to the rear end of the sliding frame  10 . Preferably, the adjusting nut  20  has a C-ring  25  mounted around the external surface of the adjusting nut  20  between the ends  21 ,  22  to hold the adjusting nut  20  rotatably on the connecting board  11  of the sliding frame  10 . The threaded end  22  of the adjusting nut  20  is formed with the mounting end  21  of the adjusting nut  20  and extends forward to the muzzle  51  of the staple gun  50 . Preferably, the adjusting nut  20  has an indent  26  formed around the external surface of the adjusting nut  20  at the threaded end  22  of the adjusting nut  20 . 
     The engaging segment  23  is formed on the external surface of the adjusting nut  20  between the threaded end  22  of the adjusting nut  20  and the connecting board  11  of the sliding frame  10  and has an external surface and multiple engaging faces  231 . The engaging faces  231  are continuously formed around the external surface of the engaging segment  23  to form a noncircular engaging segment  23 . The spring  24  is mounted around the mounting end  21  of the adjusting nut  20  and abuts the external surface of the staple gun  50  to provide a returning force to the sliding frame  10 . 
     The fixing arm  30  is rotatably connected to the sliding frame  10 , engages with the adjusting nut  20  and has a bottom end, a top end, a rear side, a front side, an inner side, a connecting rod  31 , an engaging recess  32 , a positioning element  33  and a limiting block  34 . The connecting rod  31  is formed on and protrudes from the rear side of the fixing arm  30  near the bottom end of the fixing arm  30  and is rotatably connected to the connecting board  11  below the engaging segment  23  of the adjusting nut  20  to enable the fixing arm  30  to rotate relative to the adjusting nut  20  and the sliding frame  10  and to the inner side of the fixing arm  30  to face the engaging segment  23  of the adjusting nut  20 . 
     The engaging recess  32  is formed in the inner side of the fixing nut  30  and engages with two adjacent engaging faces  231  of the engaging segment  23 . The positioning element  33  is formed on and protrudes from the rear side of the fixing arm  30  near the top end of the fixing arm  30  above the arc sidewall of the connecting board  11  and has a lower end and a positioning protrusion  331 . The positioning protrusion  331  is formed on the lower end of the positioning element  33  and selectively engages with one of the positioning recesses  111  of the connecting board  11  to hold the fixing arm  30  with the sliding frame  10 . The limiting block  34  is formed on and protrudes from the rear side of the fixing arm  30  opposite to the connecting rod  31  and selectively abuts the connecting board  11  of the sliding frame  10 . 
     The abutting shaft  40  may be U-shaped, is connected to the adjusting nut  20  and is movably connected to the opposite sidewall of the staple gun that is opposite to the adjusting nut  20  and has two ends. One of the ends of the abutting shaft  40  is mounted in and screwed with the threaded end  22  of the adjusting nut  20  and the other end of the abutting shaft  40  is movably connected to the opposite sidewall of the staple gun that is opposite to the adjusting nut  20  and abuts the external surface of the staple gun  50 . 
     With reference to  FIG. 3 , when a user wants to adjust the depth of a staple of the staple gun  50  inserted into objects of a staple gun  50  that has the adjusting-fixing assembly in accordance with the present invention. First the user can use the connecting rod  31  as a pivot to turn the top end of the fixing arm  30  outwardly to enable the fixing arm  30  to rotate relative to sliding frame  10  and separating from the adjusting nut  20 . When the fixing arm  30  separates from the adjusting nut  20 , the positioning protrusion  331  of the positioning element  33  will engage with the lateral positioning recess  111  of the connecting board  11  to hold the fixing arm  30  with the sliding frame  10  and the limiting block  34  will abut with the sliding frame  10  to prevent the fixing arm  30  from over-rotating. 
     According to the above-mentioned operation, the engaging recess  32  of the fixing arm  30  will disengage with engaging faces  231  of the engaging segment  23 . Then, the user can rotate the adjusting nut  20  rotating relative to the connecting board  11  of the sliding frame  10  by pushing the indent  26  on the external surface of the adjusting nut  20  to enable the abutting shaft  40  to move forward or backward relative to the muzzle  51  of the staple gun  50  and the depth of the staple inserted into objects can be set easily and conveniently by the adjusting-fixing assembly in accordance with the present invention. 
     After adjusting the depth of the staple inserted into objects, with reference to  FIG. 5 , the user needs to push the fixing arm  30  back to the original position to enable the engaging recess  32  to engage securely with two adjacent engaging faces  231  of the noncircular engaging segment  23  and to enable the positioning protrusion  331  to engage with the other positioning recess  11  of the connecting board  11 . Then, the fixing arm  30  can be engaged securely with the adjusting nut  20  by the engagement between the engaging recess  32 , the engaging face  231 , the positioning recess  111  and the positioning protrusion  331  to prevent the adjusting nut  20  from rotating relative to the sliding frame  10 . Therefore, the vibration that produced by the staple gun  50  during the staple ejecting into the object cannot make the adjusting nut  20  rotating relative to the sliding frame  10  and the depth of the staple inserted into the object will not be changed by the vibration of the staple gun  50  and this can provide a preferred quality of construction to the staple gun  50 . 
     Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.