Tool bit fixing and holding device with accessory quick insertion function and electric tool with tool bit fixing and holding device

Abstract

The utility model discloses a tool bit fixing device with an accessory quick-inserting function and an electric tool thereof, and particularly belongs to the technical field of electric tools, the tool bit fixing device comprises an output shaft, a longitudinal hole used for inserting a tool bit is arranged in the output shaft, a slot penetrating into the longitudinal hole is arranged on the side wall of the output shaft, a steel ball is clamped in the slot, and the steel ball is arranged in the slot. The output shaft is sleeved with a sleeve, the inner wall of the sleeve is provided with a protruding block which extrudes the steel ball to the longitudinal hole, the output shaft is further sleeved with a compressed spring and a retainer, the compressed spring is used for extruding the retainer, the inner side of the retainer is provided with a protruding part which extends into the narrow groove, and the protruding part is used for pushing the steel ball to the protruding block under the extrusion effect of the compressed spring; at least one part of the side part of the retainer is disconnected; the split type design is adopted, the material and the manufacturing mode of the retainer are not limited by the compression spring, the service life is longer, the side portion of the retainer is disconnected, the retainer can be installed from the side portion of the output shaft, and installation is faster and more convenient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electric tool technical field, specifically belongs to a kind of tool bit holding device with accessory quick insertion function and its electric tool. BACKGROUND

[0002] Rotary impact type electric tools need to replace accessories, such as bits, frequently, and usually need two hands to replace accessories: one hand pulls the sleeve of the holding device backward, and the other hand inserts or removes the accessories from the output shaft hole.

[0003] A rotary impact tool with tool bit holding device is disclosed in Chinese Utility Model Patent No. CN202190000587.X: it includes a housing, an electric motor supported in the housing, and a drive assembly. The drive assembly includes an anvil having a longitudinal bore for selectively receiving a tool bit and a plurality of radial slots extending through the anvil from the longitudinal bore. The rotary impact tool further includes a tool bit holding device, which includes: a plurality of spherical detents received in the respective radial slots; a collar slidably disposed on the anvil, having an inner surface for maintaining a portion of the spherical detents within the longitudinal bore; and a collar spring for biasing the collar rearward to a first collar position. The tool bit holding device further includes a helical detent spring encircling the anvil, having a continuous helical structure with a plurality of protrusions extending into the radial slots, which are used to bias the spherical detents toward the open end of the bore.

[0004] However, this solution has the following problems: the helical detent spring needs to be installed from the front end of the anvil to the inside in an axial direction, and the interference travel of the protrusions of the helical detent spring and the anvil is long, making installation difficult. Meanwhile, the continuous helical structure and the protrusions are integrally formed as a helical detent spring, and during production, the same wire is bent to form the helical detent spring, so the material and wire diameter size are the same. The connection bending part of the protrusions and the helical structure has a low service life, and the overall function reliability is poor. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims to overcome the deficiencies in the prior art, and provides a tool bit holding device with accessory quick insertion function. The present application provides the following technical solutions:

[0006] The output shaft is internally provided with a longitudinal hole for inserting a tool bit, a slot is provided on the side wall of the output shaft and penetrates into the longitudinal hole, a steel ball is engaged in the slot, a sleeve is sleeved on the output shaft, a protrusion is provided on the inner wall of the sleeve and pushes the steel ball towards the longitudinal hole, a compression spring and a stopper are further sleeved on the output shaft, the compression spring is used to press the stopper, an inward protruding portion is provided on the inner side of the stopper and penetrates into the slot, and the inward protruding portion is used to push the steel ball towards the protrusion under the pressing action of the compression spring; and the stopper is broken at least at one side.

[0007] Compared with the spiral stop spring in the prior art, the compression spring and the stopper are two different parts, the compression spring can be made of a wire during production, the stopper can be made of a different material from the compression spring, and the shape characteristics of the stopper are more diverse, so the shape and material of the stopper can be designed according to the function of the inward protruding portion which needs to be pressed for a long time, and the service life is longer; and the stopper is broken at least at one side, so that the stopper has a fracture or can be divided into multiple parts, the stopper can be installed from the side of the output shaft, and the stopper does not need to be sleeved from the front end of the output shaft, so that the inward protruding portion does not interfere with the outer wall of the output shaft, and the installation is more convenient and faster.

[0008] The stopper is a stop ring, and the inward protruding portion is a U-shaped protrusion provided on the inner side of the stop ring; the two sides of the stop ring can be broken into an upper stop ring and a lower stop ring.

[0009] The upper stop ring and the lower stop ring are provided with wedge structures at the end portions, and the wedge structures are used to splice the upper stop ring and the lower stop ring to form the stop ring.

[0010] The stop ring is in the shape of a flat sheet, and the compression spring abuts against the end face of the stop ring. The contact range of the compression spring and the stop ring is larger, and the compression spring can conveniently exert an elastic force on the stop ring.

[0011] The stopper is a stop clamp spring, the inward protruding portion is a U-shaped bend formed by bending the stop clamp spring inward, and an opening is formed on one side of the stop clamp spring.

[0012] The stop clamp spring is made of an elastic metal material and is wound.

[0013] A gasket is further arranged between the compression spring and the stop clamp spring. The gasket is used to transmit the elastic force of the compression spring to the stop clamp spring.

[0014] In a second aspect, the application further provides an electric tool.

[0015] The tool bit holding device with the accessory quick insertion function comprises a housing and an electric motor supported in the housing, and the electric motor is used to drive the output shaft (1) to rotate.

[0016] In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:

[0017] The compression spring and the stopper are used to replace the spiral stop spring in the prior art, that is, a split type design is used, the shape of the stopper can be designed more diversely, the material and manufacturing method of the stopper are not limited by the compression spring, the service life is longer, and the side part of the stopper is disconnected, the stopper can be installed from the side part of the output shaft, and the installation is more convenient.

[0018] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, it should be understood that the following drawings only show some embodiments of the present application, therefore should not be regarded as a limitation to the scope, for those skilled in the art, without creative labor, other related drawings can also be obtained from these drawings.

[0020] Figure 1 It is a cross-sectional view of a tool bit holding device with accessory quick insertion function.

[0021] Figure 2 It is an internal structure diagram of a tool bit holding device with accessory quick insertion function.

[0022] Figure 3 It is a stop ring schematic diagram of a tool bit holding device with accessory quick insertion function.

[0023] Figure 4 It is a cross-sectional view of a tool bit holding device with accessory quick insertion function.

[0024] Figure 5 It is an internal structure diagram of a tool bit holding device with accessory quick insertion function.

[0025] Figure 6 It is a stop ring schematic diagram of a tool bit holding device with accessory quick insertion function.

[0026] Reference signs: 1, output shaft; 11, longitudinal hole; 12, slot; 2, steel ball; 3, sleeve; 31, protrusion; 4, compression spring; 5, stopper; 51, stop ring; 511, upper stop ring; 512, lower stop ring; 513, wedge structure; 514, U-shaped protrusion; 52, stop spring; 521, U-shaped bending; 522, opening; 53, gasket. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters designate the same or like components throughout the drawings. The embodiments described below are illustrative only, and are not intended to be limiting on the present application.

[0028] In the present application, unless specifically defined otherwise and limited, the terms "mount", "connect", "connection", "fixed", and the like should be construed as broadly as possible, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the present application, unless specifically defined otherwise and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0030] Please refer to Figures 1-6 As shown in the utility model provides a kind of accessory quick insertion function's tool bit holding device;Including output shaft 1, longitudinal hole 11 for being inserted into tool bit is provided in output shaft 1, slot 12 is provided on the side wall of output shaft 1 and is inserted into longitudinal hole 11, steel ball 2 is engaged and arranged in slot 12, sleeve 3 is provided on the outer sleeve of output shaft 1, the inner wall of sleeve 3 is provided with protrusion 31, which is extruded to longitudinal hole 11 with steel ball 2, spring 4 and stop piece 5 are further provided on output shaft 1, spring 4 is used to extrude reset stop piece 5, the inner side of stop piece 5 is provided with protruding portion, which is inserted into slot 12, and protruding portion is used to push steel ball 2 to protrusion 31 under the extrusion of spring 4;The side of stop piece 5 is at least one place broken.

[0031] Embodiment one

[0032] Stop piece 5 is stop ring 51, and protruding portion is U-shaped protruding portion 514 provided on the inner side of stop ring 51;The two sides of stop ring 51 can be broken into upper stop ring 511 and lower stop ring 512.

[0033] The end of the upper stop ring 511 and the lower stop ring 512 is provided with a wedge structure 513, which is used to splice the upper stop ring 511 and the lower stop ring 512 to form the stop ring 51.

[0034] The stop ring 51 is in a flat sheet shape, and the compression spring 4 is in abutment with the end face of the stop ring 51.

[0035] During installation, the compression spring 4 is sleeved on the output shaft 1 from the front end of the output shaft 1, and then the upper stop ring 511 and the lower stop ring 512 are respectively clamped from the side of the output shaft 1, so that the U-shaped protruding part 514 extends into the slot 12, and then the upper stop ring 511 and the lower stop ring 512 are clamped with each other at the end provided with the wedge structure 513, and then the steel ball 2 is placed in the slot 12, and the sleeve 3 is sleeved on the output shaft 1.

[0036] Embodiment two

[0037] The stopper 5 is a stop snap spring 52, the protruding part is a U-shaped bending 521 formed by bending the stop snap spring 52 inward, and the stop snap spring 52 is disconnected on one side to form an opening 522.

[0038] The stop snap spring 52 is made of elastic metal material and is coiled.

[0039] The compression spring 4 and the stop snap spring 52 are further provided with a gasket 53.

[0040] During installation, the compression spring 4 and the gasket 53 are sequentially sleeved on the output shaft 1 from the front end of the output shaft 1, and then the stop snap spring 52 is clamped from the side of the output shaft 1 through the opening 522, and the U-shaped bending 521 extends into the slot 12, and then the steel ball 2 is placed in the slot 12, and the sleeve 3 is sleeved on the output shaft 1.

[0041] An electric tool, comprising the above-mentioned tool bit holding device with the accessory quick insertion function, further comprising a housing and an electric motor supported in the housing; the electric motor is used to drive the output shaft 1 to rotate.

[0042] In specific implementation,

[0043] The output shaft 1 has a hexagonal longitudinal hole 11, which can selectively receive a plurality of interchangeable accessories. Meanwhile, the output shaft 1 has two or more radial slots 12, which can allow the steel ball 2 to move forward and backward along the slot 12. The sleeve 3 has a protrusion 31, when the steel ball 2 moves radially in the slot 12 to abut against the protrusion 31, the steel ball 2 is pushed into the recess of the accessory to limit the axial movement of the accessory, thereby fixing the accessory in the output shaft 1, when the steel ball 2 does not coincide with the protrusion 31, the steel ball 2 can move away from the longitudinal hole 11 in the slot 12, at this time, the accessory is not clamped and can move radially along the longitudinal hole 11 to be pulled out.

[0044] The stopper 5 has a protruding part which can extend into the slot 12 to push the steel ball 2 to move, the compression spring 4 is in compression state, the stopper 5 is pushed to move forward to reset, the stopper 5 pushes the steel ball 2 to the front end of the slot 12, that is, the steel ball 2 is pushed to the protruding block 31.

[0045] When the accessory is inserted, the tail end of the accessory interferes with the steel ball 2, the steel ball 2 is pushed to move backward, that is, the steel ball 2 moves away from the protruding block 31 in the slot 12, the compression spring 4 is compressed, when the steel ball 2 moves away from the protruding block 31, the accessory pushes the steel ball 2 to move away from the longitudinal hole 11 in the slot 12, the accessory is inserted into the longitudinal hole 11, at this time, the stopper 5 pushes the steel ball 2 to the protruding block 31 under the elastic force of the compression spring 4, and the steel ball 2 is in contact with the protruding block 31 and is clamped into the recess of the accessory, at this time, the steel ball 2 is in contact with the protruding block 31, and the steel ball 2 cannot move outward and is clamped into the recess of the accessory.

[0046] When the accessory needs to be pulled out, the sleeve 3 can be moved forward, the protruding block 31 of the sleeve 3 does not abut against the steel ball 2, the steel ball 2 can move away from the longitudinal hole 11 in the slot 12 again, at this time, the accessory is pulled out, the steel ball 2 does not limit the axial movement of the accessory, and the accessory can be pulled out.

[0047] Although the embodiments of the application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. A tool bit holding device with accessory quick insertion function, comprising an output shaft (1), a longitudinal hole (11) for inserting a tool bit is arranged in the output shaft (1), a slot (12) penetrating into the longitudinal hole (11) is arranged on the side wall of the output shaft (1), a steel ball (2) is clamped in the slot (12), a sleeve (3) is sleeved on the output shaft (1), a protrusion (31) for extruding the steel ball (2) towards the longitudinal hole (11) is arranged on the inner wall of the sleeve (3), characterized in that: The output shaft (1) is further sleeved with a compression spring (4) and a stopper (5), the compression spring (4) is used for extruding the stopper (5), the stopper (5) is internally provided with a protruding part extending into the slot (12), the protruding part is used for pushing the steel ball (2) to the protruding block (31) under the extruding action of the compression spring (4); and the stopper (5) is broken at least at one side.

2. A tool bit holder with quick attachment of accessories according to claim 1, characterized in that: The stopper (5) is a stop ring (51), the protruding part is a U-shaped protruding part (514) provided on the inner side of the stop ring (51); and the stop ring (51) is broken into an upper stop ring (511) and a lower stop ring (512) at two sides.

3. A tool bit holder with quick attachment of accessories according to claim 2, characterized in that: The upper stop ring (511) and the lower stop ring (512) are provided with wedge-shaped structures (513) at ends, the wedge-shaped structures (513) are used for splicing the upper stop ring (511) and the lower stop ring (512) to form the stop ring (51).

4. The tool bit holder with quick attachment of accessories of claim 2, wherein: The stop ring (51) is in a flat sheet shape, the compression spring (4) abuts against the end face of the stop ring (51).

5. The tool bit holder with quick attachment of accessories of claim 1, wherein: The stopper (5) is a stop snap spring (52), the protruding part is a U-shaped bending (521) formed by bending the stop snap spring (52) inwardly, and the stop snap spring (52) is broken at one side to form an opening (522).

6. A tool bit holder with quick attachment of accessories according to claim 5, characterized in that: The stop snap spring (52) is made of elastic metal material.

7. The tool bit holder with quick attachment of accessories of claim 5, wherein: A gasket (53) is further arranged between the compression spring (4) and the stop snap spring (52).

8. A power tool characterized by: The knife head holding device with the accessory quick insertion function comprises the knife head holding device and a shell, and an electric motor is further arranged in the shell, the electric motor is used for driving the output shaft (1) to rotate. The knife head holding device with the accessory quick insertion function comprises the knife head holding device and a shell, and an electric motor is further arranged in the shell, the electric motor is used for driving the output shaft (1) to rotate.

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