Arrangement of a quick-release bit holder

Abstract

Arrangement of a quick-release bit holder, which arrangement comprises a bit holder (10), a sliding bushing (20) and a quick-release unit (30), characterized by that the bit holder (10) has a round shaft (101), one end section of which is designed such that a plurality of equiangular cutting surfaces (102) are formed on the outer circumference of the end section, so that the end section is designed as a square connecting section (103), wherein the cutting surfaces (102) are tapered such that a locking edge (104) is formed in the transition region between the shaft (101) and the connecting section (103), wherein a first positioning ball (11) is inserted into the connecting section (103) and a receiving opening (105) is recessed on the connecting section (103), into which receiving opening a spring (12) and a positioning pin (13) are inserted one after the other; that the sliding bushing (20) has a first end 201 and a second end (202), wherein between the first and the second end (201, 202) a square drive hole (203) is arranged, which extends through the first and the second end (201, 202), wherein in the drive hole (203), specifically at a location adjacent to the first end (202), a groove (204) is arranged in an annular manner, which groove is connected to the drive hole (203) on its side facing the second end (202) by means of a guide surface (205), wherein in the center of each of the at least two opposite sides of the drive hole (203) a chamfer (206) is cut, wherein the sliding bushing (20) with the drive hole (203) is placed over the connecting section (103) and the positioning pin (13) is inserted into the groove under the action of the spring (12). (204) is pressed sothat the positioning pin (13) engages in the groove (204) or the sliding bushing (20) is supported with the first end (201) on the locking edge (104), whereby the sliding bushing (20) can only slide to a limited extent on the bit holder (10), wherein on the outer circumference of the end of the sliding bushing (20) facing away from the first end (201) a tapered section (207) is formed, on which at least one through-bore (208) is arranged, which is connected to the drive hole (203) and is provided for receiving a second positioning ball (21); and , that the quick-release unit (30) is composed of a connecting ring (31), an elastic element (32), a securing clamp (33) and a sleeve (34), wherein the connecting ring (31) and the elastic element (32) are inserted one after the other over the tapered section (207) of the sliding bushing (20), wherein the securing clamp (33) is embedded in the tapered section (207) in such a way that a release of the elastic element (32) from the securing clamp (33) is prevented and the elastic element (32) is held between the connecting ring (31) and the securing clamp (33) and applies an elastic force to the connecting ring (31) and the securing clamp (33), wherein the sleeve (34) has a first end opening (341) and a second end opening (342), wherein the second end opening (342) is smaller than the first end opening (341) and can be connected to the sleeve (34) by means of an inclined surface section (343),wherein by inserting the sleeve (34) over the tapered section (207), the securing clamp (33), the elastic element (32) and the connecting ring (31) are covered by the sleeve (34) and the first end opening (341) and the connecting ring (31) are thereby non-positively connected to one another, wherein the second positioning ball (21) is caused to protrude or retract by means of the inclined surface section (343) because the sleeve (34) causes the connecting ring (31) to move or the sleeve (34) is released and springs back further under the action of the elastic element (32).

Description

Technical FieldThe invention relates to an arrangement of a quick-release bit holder, in particular an arrangement of a quick-release bit holder to which a socket or a bit can be connected.Prior ArtIn TW M503983 U a conventional arrangement of a quick release bit holder is known, which arrangement comprises a bit holder main body 10, a slide bush 20, a spring 30 and a positioning pin 40. The bit holder main body 10 has a round shaft 11 one end of which is formed so that a plurality of equiangular cut surfaces 12 are formed on the outer periphery of the end of the shaft, the cut surfaces 12 together forming a square terminal portion 13. In addition, the cut surfaces 12 are formed so as to taper such that a blocking edge 14 is formed in the transition region between the shank 11 and the connection section 13. A positioning ball 15 is inserted into the terminal portion 13, and a receiving hole 16 is recessed on the terminal portion 13. On one side of the connection section 13, a magnetic element can be arranged hidden, as required. The sliding bushing 20 has a first end 21 and a second end 22, wherein a square drive hole 23 is arranged between the first and the second end 21, 22, which drive hole runs through the first and the second end 21, 22. In the drive hole 23, at a position adjacent to the first end 21, a groove 24 is annularly arranged, which groove is connected to the drive hole 23 by means of a guide surface 25 in the direction of the second end 22. In the center of each side wall of the drive hole 23, a chamfer 26 is cut. The spring 30 and the positioning pin 40 are inserted in order into the receiving hole 16 of the bit holder main body 10. Furthermore, the slide bush 20 with the drive hole 23 is inserted over the connection portion 13. Under the action of the spring 30, the positioning pin 40 is pressed into the groove 24 in such a way that the positioning pin 40 engages into the groove 24 or the sliding bushing 20 is supported with the first end 21 on the locking edge 14. Thus, the slide bush 20 can slide only limitedly on the bit holder main body 10.For inserting the bit holder, the slide socket 20 is slid rearward so that the terminal portion 13 moves forward and then protrudes from the drive hole 23, and a socket 50 is connectable to the protruding terminal portion 13. When the slide bush 20 is pushed rearward, the first end 21 and the locking edge 14 are braced against one another, so that the slide bush 20 is securely blocked and thereby secured against detachment. When the slide bush 20 is pushed forward in reverse, the terminal portion 13 is pushed into the drive hole 23 so that the terminal portion 13 remains completely hidden in the drive hole 23. As a result, a receiving space is formed in the drive hole 23, into which a bit 60 can be inserted. If the slide bush 20 is pushed forward, the positioning pin 40 will automatically engage in the groove 24 under the action of the spring 30 in order to restrict the movement of the slide bush 20 in such a way that the slide bush 20 can slide at most up to the point of the longest displacement path.However, the conventional arrangement of a quick release bit holder of the type mentioned in the opening paragraph has the following disadvantages. It is possible that a receiving space is formed in the drive hole 23 when the slide bush 20 is slid forward, wherein a bit 60 can be inserted into the receiving space. However, the joint formed by just inserting has a disadvantage that the bit 60 is directly pushed out of the driving hole 23 by the bit holder main body 10 when the slide bush 20 is pushed rearward. Bit 60 must be cleared promptly and may be lost immediately.Object of the InventionThe invention is based on the object of creating an arrangement of a quick-release bit holder, which arrangement avoids these disadvantages associated with the prior art.Technical SolutionThis object is achieved according to the invention by an arrangement of a quick-release bit holder having the features of claim 1. Advantageous embodiments are the subject of the dependent claims.The invention provides an arrangement of a quick release bit holder, which arrangement comprises a bit holder, a sliding bushing and a quick release unit. The bit holder has a round shaft, one end portion of which is formed so that a plurality of equiangular cut surfaces are formed on the outer periphery of the end portion, so that the end portion is formed as a square terminal portion. In addition, the cut surfaces are formed so as to taper such that a blocking edge is formed in the transition region between the shank and the connection section. A first positioning ball is inserted into the terminal portion, and a receiving hole into which a spring and a positioning pin are inserted in order is recessed at the terminal portion. The slide bushing has a first end and a second end, wherein a square drive hole is arranged between the first and the second end, which drive hole runs through the first and the second end. In the drive hole, namely at a location adjoining the first end, a groove is arranged annularly, which groove is connected to the drive hole on its side facing the second end by means of a guide surface. In the center of the at least two opposite sides of the drive hole, a chamfer is cut in each case. The sliding bushing is inserted with the drive hole over the connection section. Under the action of the spring, the positioning pin is pressed into the groove in such a way that the positioning pin engages into the groove or the sliding bushing is supported with the first end on the locking edge. Thus, the sliding bushing can only slide on the bit holder to a limited extent. Furthermore, a tapering section is formed on the outer periphery of the end of the sliding bushing facing away from the first end, on which tapering section at least one through bore is arranged, which is connected to the drive hole and is provided for receiving a second positioning ball. The quick release unit is composed of a connection ring, an elastic element, a securing clip and a sleeve. The terminal ring and the elastic member are inserted over the taper portion of the slide bush in order, the retainer is embedded in the taper portion so as to prevent the elastic member from being separated from the retainer, and the elastic member is held between the terminal ring and the retainer and applies elastic force to the terminal ring and the retainer. The sleeve has a first end opening and a second end opening, wherein the second end opening is smaller than the first end opening and can be connected to the sleeve by means of an inclined surface section. If the sleeve is inserted over the tapering section in such a way that the securing clamp, the elastic element and the connection ring are covered by the sleeve, the first end opening and the connection ring are connected to one another in a force-fitting manner. By causing the sleeve to slide the connecting ring or releasing the sleeve and further springing back under the action of the elastic element, the second positioning ball is caused to protrude or retract by means of the inclined surface section. Thus, an arrangement of a quick release bit holder according to the invention is achieved.The arrangement of a quick release bit holder according to the invention is characterized in that the quick release unit holds the bit inserted into the drive hole and at the same time prevents the sliding bushing from being pushed rearward, so that the connection section cannot protrude from the drive hole. The rapid latching prevents the bit from being pressed directly out of the drive hole by the bit holder. Thus, no additional overhead is required for cancelling a dropped bit and there is no concern for an imminent loss of the bit.Brief Description of the DrawingsFIG. 1 shows a perspective view of an arrangement according to the invention of a quick-release bit holder in the assembled state. FIG. 2 shows an exploded view of the arrangement according to the invention from FIG. 1. FIG. 3 shows a sectional view of the arrangement according to the invention from FIG. 1 in the assembled state. Fig. 4 is a schematic diagram showing the insertion of bits of various kinds after pushing the sleeve forward according to the invention. Figure 5 is a schematic diagram illustrating a plugged-in, clipped bit according to the invention. FIG. 6 is a sectional view showing a terminal portion protruding by pushing the slide bush backward according to the invention. FIG. 7 is a perspective view showing a terminal portion protruding by pushing the slide bush backward according to the invention. FIG. 8 shows a schematic illustration for illustrating the connection of a socket key to a bit holder according to the invention.DETAILED DESCRIPTION OF A PREFERRED EMBODIMENTIn the following, objects, features and advantages of the present invention will be explained in more detail with reference to the detailed description of an exemplary embodiment and the attached drawings. However, the invention is not limited to the description of this embodiment and its illustration in the accompanying drawings.As shown in Figures 1 to 3, the invention relates to an assembly of a quick release bit holder, which assembly comprises a bit holder 10, a slide bushing 20 and a quick release unit 30. The bit holder 10 has a round shaft 101 whose one end portion is formed so that a plurality of equiangular cut surfaces 102 are formed on the outer periphery of the end portion, so that the end portion is formed as a square terminal portion 103. In addition, the cut surfaces 102 are formed so as to taper such that a blocking edge 104 is formed in the transition region between the shank 101 and the connection section 103. A first positioning ball 11 is inserted into the terminal portion 103, and a receiving hole 105 into which a spring 12 and a positioning pin 13 are inserted in sequence is recessed on the terminal portion 103. The sliding bushing 20 has a first end 201 and a second end 202, wherein a square drive hole 203 is arranged between the first and the second end 201, 202, which drive hole runs through the first and the second end 201, 202. In the drive hole 203, namely at a location adjoining the first end 202, a groove 204 is arranged annularly, which groove is connected to the drive hole 203 on its side facing the second end 202 by means of a guide surface 205. In the center of the at least two opposite sides of the drive hole 203, a chamfer 206 is cut in each case. The slide bush 20 is inserted with the drive hole 203 over the terminal portion 103. Under the action of the spring 12, the positioning pin 13 is pressed into the groove 204 in such a way that the positioning pin 13 engages into the groove 204 or the sliding bushing 20 is supported with the first end 201 on the locking edge 104. Thus, the sliding bushing 20 can only slide on the bit holder 10 to a limited extent. Furthermore, a tapering section 207 is formed on the outer periphery of the end of the sliding bushing 20 facing away from the first end 201, on which tapering section at least one through bore 208 is arranged, which is connected to the drive hole 203 and is provided for receiving a second positioning ball 21. The quick release unit 30 is composed of a connection ring 31, an elastic element 32, a securing clip 33 and a sleeve 34. The terminal ring 31 and the elastic member 32 are inserted in order over the taper portion 207 of the slide bush 20, the retainer 33 is embedded in the taper portion 207 so as to prevent the elastic member 32 from being separated from the retainer 33, and the elastic member 32 is held between the terminal ring 31 and the retainer 33, and applies elastic force to the terminal ring 31 and the retainer 33. The sleeve 34 has a first end opening 341 and a second end opening 342, wherein the second end opening 342 is smaller than the first end opening 341 and can be connected to the sleeve 34 by means of an inclined surface section 343. If the sleeve 34 is inserted over the tapering section 207 in such a way that the securing clip 33, the elastic element 32 and the connection ring 31 are covered by the sleeve 34, the first end opening 341 and the connection ring 31 are connected to one another in a force-fitting manner. By the sleeve 34 causing the terminal ring 31 to slide or the sleeve 34 to be released and further recessed under the action of the elastic member 32, the second positioning ball 21 is caused to protrude or retreat by the inclined surface portion 343.According to the invention, a hexagonal connecting part 106 is arranged on the end of the shank 101 that is different from the connecting portion 103, on which connecting part a notch 107 is arranged, so that an electric or pneumatic tool can be connected to the bit holder 10 by means of the connecting part 106 and the notch 107.According to the invention, the positioning pin 13 is a cap nut, so that one end of the spring 12 can be inserted into the interior of the positioning pin 13 and supported and stopped therein.According to the invention, a tooth-shaped corrugation 311 is arranged on the connecting ring 31, by means of which corrugation the connecting ring 31 can better engage in the sleeve 34.According to the invention, the securing clip 33 is a C-ring.According to the invention, the sleeve 34 is inserted directly onto the connecting ring 31 in a force-fit manner by means of the first end opening 341.According to the invention, a ring 35 is furthermore arranged between the connection ring 31 and the elastic element 32 in such a way that the ring 35 supports on the connection ring 31 and the elastic element 32.For inserting the quick release bit holder, the sleeve 34 is pushed forward so that the second positioning ball 21 is not supported by the inclined surface portion 343 and meanwhile moves out of the driving hole 203. In the process of pushing the sleeve 34 forward, the slide sleeve 20 is also caused to slide forward, so that the terminal portion 103 is pushed into the drive hole 203 and remains completely hidden in the drive hole 203. This creates a receiving space in the drive hole 23, into which a bit 40 of different type can be inserted (see FIG. 4 ). When the bit 40 is inserted into the driving hole 203 and the hand gripping the sleeve 34 is released, the sleeve 34 is returned to the initial position by the elastic member 32. In addition, the second positioning ball 21 is supported by the inclined surface portion 343 again such that the second positioning ball 21 runs inward. Thereby, the bit 40 can be securely clamped in the drive hole 203 by the second positioning ball 21 (see FIG. 5 ). Thus, the slide bush 20 can no longer be slid rearward, so that the terminal portion 103 cannot protrude from the drive hole 203, accordingly. Of course, there is no fear that the bit 40 is directly pushed out from the driving hole 203. If the slide bush 20 is pushed forward, the positioning pin 13 will automatically engage in the groove 204 under the action of the spring 12 in order to restrict the movement of the slide bush 20 in such a way that the slide bush 20 can slide at most up to the point of the longest displacement path.When the sleeve 34 is pushed forward and the bit 40 is thereby removed, the slide bush 20 can be pushed further rearward to have the terminal portion 103 project forward from the drive hole 203. Thus, a socket 50 can be clipped to the protruding connection section 103 (see FIGS. 6 to 8 ). When the slide bush 20 is slid rearward, the first end 201 of the slide bush 20 and the locking edge 104 will block each other to securely retain and secure the slide bush 20 against disengagement.The quick release bit holder arrangement according to the present invention is characterized in that the quick release unit 30 holds the bit 40 inserted into the drive hole 203 while preventing the slide bush 20 from being slid rearward so that the terminal portion 103 cannot protrude from the drive hole 203. The rapid latching prevents the bit 40 from being pressed directly out of the drive hole 203 by the bit holder 10. Thus, no additional effort is required to cancel a dropped bit 40, and there is no concern about an imminent loss of the bit 40.Although the present invention has been described in detail with reference to an exemplary embodiment, it is obvious to a person skilled in the art that the invention is not limited to this exemplary embodiment, but rather that modifications are possible in such a way that individual features can be omitted or other combinations of features can be realized, as long as the scope of protection of the appended claims is not left. The disclosure of the present invention includes all combinations of the individual features presented.List of reference characters10 Bit holder 101 Shank 102 Cut surface 103 Connecting portion 104 Locking edge 105 Receiving opening 106 Connecting part 107 Notch 11 First positioning ball 12 Spring 13 Positioning pin 20 Sliding bush 201 First end 202 Second end 203 Drive hole 204 Groove 205 Guide surface 206 Chamfer 207 Tapering portion 208 Through-bore 21 Second positioning ball 30 Quick-release unit 31 Connecting ring 311 Tooth-shaped corrugation 32 Elastic element 33 Securing clip 34 Sleeve 341 First end opening 342 Second end opening 343 Inclined surface portion 35 Ring 40 Bit 50 Socket

Claims

Arrangement of a quick-release bit holder, which arrangement comprises a bit holder (10), a sliding bushing (20) and a quick-release unit (30), characterized in that the bit holder (10) has a round shank (101), one end section of which is formed such that a plurality of equiangular cut surfaces (102) are formed on the outer periphery of the end section, such that the end section is formed as a square connection section (103), wherein the cut surfaces (102) are formed in a tapering manner such that a blocking edge (104) is formed in the transition region between the shank (101) and the connection section (103), wherein a first positioning ball (11) is inserted into the connection section (103) and a receiving opening (105) is formed in a recessed manner at the connection section (103), into which a spring (12) and a positioning pin (13) are inserted in sequence; that the sliding bushing (20) has a first end 201 and a second end (202), wherein a square drive hole (203) is arranged between the first and the second end (201, 202), which drive hole runs through the first and the second end (201, 202), wherein a groove (204) is arranged annularly in the drive hole (203), namely at a location adjoining the first end (202), which groove is connected to the drive hole (203) on its side facing the second end (202) by means of a guide surface (205), wherein a chamfer (206) is formed cut in each case in the center of the at least two opposite sides of the drive hole (203), wherein the sliding bushing (20) is inserted with the drive hole (203) over the connecting portion (103) and the positioning pin (13) is pressed into the groove (204) under the action of the spring (12) such that the positioning pin (13) engages in the groove (204) or the sliding bushing (20) is supported with the first end (201) on the locking edge (104), whereby the sliding bushing (20) can slide only to a limited extent on the bit holder (10), wherein a tapering portion (207) is formed on the outer periphery of the end of the sliding bushing (20) facing away from the first end (201), on which tapering portion at least one through bore (208) is arranged, which is connected to the drive hole (203) and is provided for receiving a second positioning ball (21); and in that the quick release unit (30) is composed of a connecting ring (31), an elastic element (32), a securing clip (33) and a sleeve (34), wherein the connecting ring (31) and the elastic element (32) are inserted in sequence over the tapering section (207) of the sliding bushing (20), wherein the securing clip (33) is embedded in the tapering section (207) such that a release of the elastic element (32) from the securing clip (33) is prevented and the elastic element (32) is held between the connecting ring (31) and the securing clip (33) and acts on the connecting ring (31) and the securing clip (33) with elastic force, wherein the sleeve (34) has a first end opening (341) and a second end opening (342), wherein the second end opening (342) is smaller than the first end opening (341) and can be connected to the sleeve (34) by means of an inclined surface section (343), wherein by plugging the sleeve (34) over the tapering section (207) the securing clip (33), the elastic element (32) and the connecting ring (31) are covered by the sleeve (34) and the first end opening (341) and the connecting ring (31) are thereby connected to one another in a force-fitting manner, wherein by the sleeve (34) causing the connecting ring (31) to slide or the sleeve (34) to be released and further springing back under the action of the elastic element (32) the second positioning ball (21) is caused to protrude or retract by means of the inclined surface section (343).Arrangement according to Claim 1, characterized in that a hexagonal connecting part (106), on which a notch (107) is arranged, is arranged at the end of the shank (101) which is different from the connecting section (103).Arrangement according to claim 1, characterised in that the positioning pin (13) is a cap nut, so that one end of the spring (12) can be inserted into the interior of the positioning pin (13) and supported and stopped therein.Arrangement according to Claim 1, characterized in that a tooth-shaped corrugation (311) is arranged on the connecting ring (31).Arrangement according to Claim 1, characterized in that the securing clip (33) is a C-ring.Arrangement according to Claim 1, characterized in that a ring (35) is arranged between the connection ring (31) and the elastic element (32) in such a way that the ring (35) is supported on the connection ring (31) and the elastic element (32).

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