Patent Publication Number: US-11376725-B1

Title: Tool holder

Description:
CROSS-REFERENCE TO RELATED U.S. APPLICATIONS 
     Not applicable. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to a tool holder, and more particularly to an innovative structure type of a tool holder. 
     2. Description of Related Art Including Information Disclosed Under 37 CFR 1.97 and 37 CFR 1.98 
     The present invention discusses a tool holder, especially a tool holder form for placing sleeving tools (e.g. sleeves). 
     This tool holder comprises a base and a rotatable binder. The common structure type can refer to the disclosure of Taiwan patent certificate No. M591462 “sleeve seat” utility patent case declared on Mar. 1, 2020. The binder disclosed in the known technology has a quadrangular driving part for setting the sleeve. A storage slot in outside diameter larger than the quadrangular driving part is formed in one end of the quadrangular driving part, so as to set the cylinder formed on the base. The storage slot and cylindrical structure are provided with an anti-dropping component and a segmented positioning element, wherein the anti-dropping component prevents the base and binder from being disengaged from each other, the segmented positioning element provides inserting positioning segmented hand feeling at two steering angles when the binder is rotating. 
     However, there are still some problems in the practical application of said sleeve seat structure type. For example, an anti-dropping component and a segmented positioning element are formed in the same annular region of the storage slot and cylindrical structure, in this type of architecture design, there are multiple inward extended lugs on the circumferential wall of the storage slot, to achieve smooth demolding in the injection molding operation, a complex slider and related link mechanism must be added in the mold, so that the manufacturing cost is increased greatly. Additionally, as the specification of binder corresponds to the sleeve specification, when the sleeve specification is small, the specification of binder must be reduced, but in this condition, the inside diameter of storage slot is too small, said slider for demolding may fail to be implemented due to insufficient space. 
     Moreover, the anti-dropping component and segmented positioning element of the known sleeve seat are arranged in the same annular region, so that their concave and convex positioning configurations influence each other, the mold fabrication is difficult and the stress intensity is influenced. 
     BRIEF SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide a tool holder, and the technical problem to be solved is how to develop a novel tool holder structure type with more ideal practicability. The tool holder is used for placing the existing sleeving tool. The sleeving tool forms a quadrangular mouthpiece. 
     Based on said objective, the technical characteristic of problem solving of the present invention is that the tool holder includes: a base, including a chassis, a boss and a convex shaft. The boss with oppositely reduced outside diameter is formed on said chassis. Said convex shaft with oppositely reduced outside diameter protrudes from said boss. Said convex shaft forms at least one abutment plate extended laterally. 
     The tool holder includes a rotating sleeve includes a seat and a quadrangular sleeve joint. Said quadrangular sleeve joint is used for setting the quadrangular mouthpiece of said sleeving tool. Said seat has a top surface, a bottom surface and a circumferential wall. Said quadrangular sleeve joint with oppositely reduced outside diameter is formed on the top surface of said seat. A groove is formed on the bottom surface of the seat. Said groove is assembled outside said boss of the base, rotatable under stress. A hollow chamber is formed in the quadrangular sleeve joint. At least one elastic piece is laterally formed in the hollow chamber. An engaging part is formed on the outside of each elastic piece. When said elastic piece is propped by the at least one abutment plate in hard mode, said engaging part localizes the quadrangular mouthpiece to prevent said sleeving tool from dropping out. An intermediate wall is formed between said hollow chamber and said groove. A perforation is formed in the intermediate wall, and the shape of the perforation must allow said convex shaft of said base and the at least one abutment plate to enter said hollow chamber through said groove. A segmented positioning member is provided, including at least one engaging part and a first inserting part and a second inserting part for the at least one engaging part the optionally engage with, where the at least one engaging part is formed on the periphery of said boss of said base. Said first inserting part and said second inserting part are formed on the groove of the rotating sleeve. 
     The tool holder also includes an anti-dropping flange, laterally expanded and formed at the predetermined height of the convex shaft of said base. Said anti-dropping flange is elastic, and the outside diameter thereof must be larger than the corresponding aperture of said perforation. When said convex shaft passes through said perforation, said anti-dropping flange penetrates into said hollow chamber through said perforation in the state of interference fit, so as to prevent said convex shaft from backward dropping out of said hollow chamber. 
     In terms of the main effect and advantage of the present invention, the anti-dropping flange is located in the hollow chamber of the quadrangular sleeve joint, whereas the segmented positioning member is located outside the hollow chamber, so that the anti-dropping flange and the segmented positioning member are dispersed to two different annular regions. Therefore, the two positioning configurations will not influence each other, it is easier to design the configuration, the mold unloading is more convenient, and the stress intensity is considered, there is practical progressiveness. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  is a three-dimensional diagram of the tool holder for setting the sleeving tool in the preferred embodiment of the present invention. 
         FIG. 2  is a stereogram of the base and rotating sleeve in exploded state in the preferred embodiment of the present invention. 
         FIG. 3  is a top view of the preferred embodiment of tool holder the present invention. 
         FIG. 4  is the  4 - 4  sectional view of  FIG. 3 . 
         FIG. 5  is the  5 - 5  sectional view of  FIG. 4 . 
         FIG. 6  is the  6 - 6  sectional view of  FIG. 4 . 
         FIG. 7  is a top view of the rotating sleeve rotated to separation angle of the present invention. 
         FIG. 8  is a cross-sectional view of partial structure disclosed in  FIG. 7 . 
         FIG. 9  is a sectional view of an oblique guide lug formed in the perforation of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  to  FIG. 6  show the preferred embodiments of the tool holder of the present invention, but the embodiments are for illustration only, the patent application is not limited to this structure. 
     The tool holder  100  is provided for placing a sleeving tool  200  (e.g. sleeve), the sleeving tool  200  forms a quadrangular mouthpiece  201 . The tool holder  100  comprises a base  10 , including a chassis  11 , a boss  12  and a convex shaft  13 . The boss  12  with shrinking outside diameter is formed on the chassis  11 . The convex shaft  13  with shrinking outside diameter protrudes from the boss  12 . The convex shaft  13  forms at least one abutment plate  14  extended laterally. A rotating sleeve  20 , including a seat  21  and a quadrangular sleeve joint  22 . The quadrangular sleeve joint  22  is used for fitting the quadrangular mouthpiece  201  of the sleeving tool  200 . The seat  21  has a top surface  211 , a bottom surface  212  and a circumferential wall  213 . The quadrangular sleeve joint  22  with shrinking outside diameter is formed on the top surface  211  of the seat  21 . A groove  214  is formed on the bottom surface  212  of the seat  21 . The groove  214  is assembled outside the boss  12  of the base  10 , rotatable under stress. A hollow chamber  221  is formed in the quadrangular sleeve joint  22 . At least one elastic piece  222  is laterally formed in the hollow chamber  221 . An engaging part  223  is formed on the outside of each elastic piece  222 . When the elastic piece  222  is propped by at least one abutment plate  14  in hard mode, the engaging part  223  localizes the quadrangular mouthpiece  201  to prevent the sleeving tool  200  from dropping out. An intermediate wall  215  is formed between the hollow chamber  221  and the groove  214 . A perforation  23  is formed in the intermediate wall  215 . The shape of the perforation  23  must allow the convex shaft  13  of the base  10  and the at least one abutment plate  14  to enter the hollow chamber  221  through the groove  214 . A segmented positioning member  30 , including at least one engaging part  33  and a first inserting part  31  and a second inserting part  32  for the at least one engaging part  33  to optionally engage with. Wherein the at least one engaging part  33  is formed on the periphery of the boss  12  of the base  10 . The first inserting part  31  and the second inserting part  32  are formed in the groove  214  of the rotating sleeve  20 . An anti-dropping flange  40 , laterally expanded and formed at the predetermined height of the convex shaft  13  of the base  10 . The anti-dropping flange  40  is elastic and the outside diameter thereof must be larger than the corresponding aperture of the perforation  23 . When the convex shaft  13  passes through the perforation  23 , the anti-dropping flange  40  penetrates into the hollow chamber  221  through the perforation  23  in the state of interference fit, so as to prevent the convex shaft  13  from backward dropping out of the hollow chamber  221 . Thereby, the anti-dropping flange  40  is located in the hollow chamber  221  of the quadrangular sleeve joint  22 , and the segmented positioning member  30  is located outside the hollow chamber  221 . 
     As shown in  FIG. 2  and  FIG. 3 , in this case, the circumferential wall  213  of the seat  21  of the rotating sleeve  20  is rectangular, and each corner is chamfered. The main effect of the implementation pattern disclosed in this case is visual recognition effect. As it is assumed to be circular, quincuncial or gear-shaped, it is difficult for the user to recognize the positioning or release condition of sleeving tool  200  (e.g. sleeve). 
     As shown in  FIG. 2 , in this case, the height of the anti-dropping flange  40  is level with the bottom height of the two abutment plates  14 . 
     As shown in  FIG. 2  and  FIG. 3 , in this case, the boss  12  is a circular convex base, the segmented positioning member  30  includes two engaging parts  33  arranged opposite each other at 180° on the periphery of the boss  12  of the base  10 . The two engaging parts  33  are laterally projecting cambered bearing ribs. The groove  214  of the rotating sleeve  20  is designed as a slot, two first inserting parts  31  and two second inserting parts  32  are arranged oppositely at 180° on the peripheral slot wall, and the first inserting parts  31  and the second inserting parts  32  are laterally cambered concave margins. Additionally, according to this embodiment, the persons with general knowledge of this technical field can easily understand that concave and convex shapes between the boss  12  and the groove  214  are interchangeable, so the concave and convex shapes of the engaging part  33  and the first inserting part  31  and the second inserting part  32  are interchangeable, that can be implemented in practice. 
     As shown in  FIG. 2 , in this case, a bevel guide face  41  is integrally extended from the anti-dropping flange  40  and connected to the convex shaft  13 . In terms of the effect of the bevel guide face  41  in this case, the anti-dropping flange  40  can pass through the perforation  23  more smoothly under the guidance of bevel face. 
     As shown in  FIG. 9 , in this case, the perforation  23  forms an oblique guide lug  50 , the oblique guide lug  50  has a reducing end  51  and an expanding end  52 . The oblique guide lug  50  in this case coordinates with the anti-dropping flange  40 , the outside diameter of the expanding end  52  is larger than the outside diameter of the anti-dropping flange  40 . The outside diameter of the reducing end  51  is smaller than the outside diameter of the anti-dropping flange  40 . The effect of the oblique guide lug  50  is as disclosed in previous paragraph, the anti-dropping flange  40  can cross the perforation  23  more smoothly under the guidance of bevel face. 
     Based on the aforesaid structure type and technical characteristic, the tool holder  100  disclosed in the present invention is in the preset positioning condition in practice, as shown in  FIG. 3  to  FIG. 6 . In this condition, the rotation angle of rotating sleeve  20  exactly allows the engaging part  33  to engage with the first inserting part  31 , so that the elastic piece  222  is propped by the abutment plate  14  in hard mode, and the engaging part  223  localizes the quadrangular mouthpiece  201  (as shown in  FIG. 1 ) to prevent the sleeving tool  200  from dropping out. Afterwards, in the preset release condition as shown in  FIG. 7  to  FIG. 8 , the rotation angle of the seat  21  of rotating sleeve  20  exactly allows the engaging part  33  to engage with the second inserting part  32 , so that the elastic piece  222  is not propped by the abutment plate  14 , and the engaging part  223  cannot localize the quadrangular mouthpiece  201  (as shown in  FIG. 1 ), the sleeving tool  200  can drop out. The main claimed effect of the present invention is to locate the anti-dropping flange  40  in the hollow chamber  221  of the quadrangular sleeve joint  22 , and to locate the segmented positioning member  30  outside the hollow chamber  221 , so that the anti-dropping flange  40  and the segmented positioning member  30  are dispersed to two different annular regions. Therefore, the two positioning configurations will not influence each other, it is easier to design the configuration, the mold unloading is more convenient, and the stress intensity is considered.