Tool head quick change structure and tool

Abstract

The tool head quick change structure and the corresponding tool provided by the application comprise: an output shaft body for accommodating a tool head; a guide shaft body for guiding the movement of the output shaft body; an elastic body for elastically connecting the guide shaft body and the output shaft body; a limiting assembly for limiting the movement of the tool head in the output shaft body; and a shell for accommodating the output shaft body and the guide shaft body; wherein the limiting assembly comprises a shaft sleeve body and a limiting body; the shaft sleeve body is sleeved on the output shaft body and is fixedly connected with the shell, and a gap is formed between the shaft sleeve body and the output shaft body; the tool head is inserted into one end of the output shaft body and is provided with a limiting groove around the one end, and the limiting groove is used for clamping the limiting body; and the output shaft body is provided with a mounting hole for accommodating the limiting body. The application can realize one-handed insertion and removal of the tool head, is simple and convenient to operate, does not require tool assistance, and improves the operation comfort and safety.

Description

Technical Field

[0001] This invention relates to the field of screwdriver technology, and in particular to a quick-change screwdriver bit structure and a corresponding screwdriver. Background Technology

[0002] Screwdrivers are commonly used tools, and due to wear and tear on the tool head, they often need to be replaced, or the switching between screwdriver bits and drill bits may be necessary. The current switching mechanism is shown in the attached diagram. Figure 1 As shown, the structure uses a combination of spring clips and steel balls. During use, the following problems were found with this structure:

[0003] 1. If the spring force is too great, it will be difficult to insert or remove the tool head when changing the tool head. It cannot be pulled out without auxiliary tools, which will affect work efficiency. Excessive force when inserting can easily damage the whole machine.

[0004] 2. If the spring tension is too low, the tool head may easily fall off during use.

[0005] 3. Screwdrivers often require working at heights, and changing screwdriver bits requires using both hands, posing a safety hazard.

[0006] Therefore, a quick-change structure is needed to solve the current problem. Summary of the Invention

[0007] To avoid the shortcomings of existing technologies, this invention provides a tool head quick-change structure that enables quick assembly and disassembly with one hand.

[0008] The present invention solves the technical problem by adopting the following technical solution: a tool head quick-change structure, comprising:

[0009] The output shaft is used to house the tool head;

[0010] Guide shaft used to guide the movement of the output shaft;

[0011] An elastic body is used to elastically connect the guide shaft and the output shaft, wherein the output shaft can overcome the elastic force of the elastic body and move along the axial direction of the guide shaft under the action of external force;

[0012] A limiting component used to limit the movement of the tool head within the output shaft body;

[0013] Housing used to accommodate the output shaft and guide shaft;

[0014] The limiting component includes a bushing body and a limiting body;

[0015] The bushing is fitted onto the output shaft and fixedly connected to the housing, and there is a gap between the bushing and the output shaft;

[0016] A limiting groove is provided around one end of the tool head that is inserted into the output shaft, and the limiting groove is for the limiting body to be engaged.

[0017] The output shaft is provided with a mounting hole for accommodating a limiting body. The limiting body can partially extend through the mounting hole to the bushing body, and the limiting body can also partially extend through the mounting hole to the limiting groove.

[0018] In several embodiments, the guide shaft, output shaft, and elastic body are arranged coaxially.

[0019] In several embodiments, the bushing body includes a head and a body arranged coaxially, and the gap between the head and the output shaft body is smaller than the gap between the body and the output shaft body.

[0020] In several embodiments, the head has a conical surface with a taper between 0 and 60°.

[0021] In several embodiments, a button body is movably connected to one end of the housing. The button body can push the output shaft body under the action of external force, and the button body cannot be detached from the housing under the elastic force of the elastic body.

[0022] In several embodiments, the button body is in contact with the output shaft body;

[0023] The button body extends outward at one end to form multiple plug-in pieces, each plug-in piece is provided with a guide rib, and the tail end of each plug-in piece is provided with a hook.

[0024] The housing has multiple bosses and guide grooves at one end. The bosses are in contact with the surface of the insert piece, and the guide grooves are for the movement of the guide ribs. The hook cannot pass through the bosses to the outside of the housing.

[0025] In several embodiments, the button body is engaged with the output shaft body.

[0026] In several embodiments, one end of the output shaft into which the tool head is inserted protrudes outside the housing.

[0027] In several implementations, the tool head is a screwdriver bit or a drill bit.

[0028] And a tool employing the aforementioned quick-change tool head structure.

[0029] The present invention has the following beneficial effects:

[0030] This invention allows for convenient loading and unloading of tool heads by adjusting the positional relationship between the holes on the output shaft and the bushing, which has a stepped inner wall, and the movement of the output shaft within the bushing. This enables the steel ball to be cleverly engaged or disengaged from the tool head's annular groove.

[0031] Using the structure of this invention, when using a screwdriver, the tool head can be easily inserted into the connector and locked in place. To remove the tool head, simply press a button.

[0032] This invention simplifies and facilitates bit replacement, enabling tool-free replacement, and especially allows for one-handed operation. It solves the problem of inconvenience when one hand is occupied, making bit replacement safer. Attached Figure Description

[0033] The accompanying drawings described herein are for illustrative purposes only and do not represent all possible implementations, nor should they be considered as limiting the scope of the invention.

[0034] Figure 1 The diagram schematically illustrates a tool head quick-change structure in the prior art;

[0035] Figure 2 The overall cross-sectional structure of the tool in Embodiment 1 is schematically shown;

[0036] Figure 3 schematically shown Figure 2 Explosion state of the medium-speed switching structure;

[0037] Figure 4 schematically shown Figure 3 A partially enlarged structure;

[0038] Figure 5 A cross-sectional view of the quick-change structure in Embodiment 1 is schematically shown;

[0039] Figure 6 The first position structure of the limiting body 50 is schematically shown;

[0040] Figure 7 The second position structure of the limiting body 50 is schematically shown;

[0041] Figure 8 , Figure 9 and Figure 10 The process of loading the tool head is illustrated schematically;

[0042] Figures 11-12 The process of removing the tool head is illustrated schematically;

[0043] Figure 13 The quick-change structure in Embodiment 2 is illustrated schematically;

[0044] Figure 14 The quick-change structure in Embodiment 3 is illustrated schematically;

[0045] Figure 15 The quick-change structure in Embodiment 4 is illustrated schematically;

[0046] Figure 16 The quick-change structure in Embodiment 5 is illustrated schematically;

[0047] Figure 17 schematically shown Figure 16 The local magnified structure in the text. Detailed Implementation

[0048] The embodiments of the present invention will be described in detail below. In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0049] Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0050] The terminology used herein is intended to explain the embodiments and is not intended to limit and / or restrict the invention.

[0051] For example, expressions such as "in a certain direction," "along a certain direction," and "relative" indicate relative or absolute configuration. They not only indicate such a configuration in a strict sense, but also indicate a state of relative displacement with tolerances or angles or distances that can achieve the same level of functionality.

[0052] like Figure 1 As shown, this is a quick-change bit structure for an existing screwdriver. The bit is clamped by a steel ball 1 and a spring clip 2. The steel ball 1 is pressed into the bit by the pressure of the spring clip 2 to achieve clamping and fixation. However, this method is inconvenient to use.

[0053] Therefore, the present invention provides a superior tool head quick-change structure, which will be described in detail below with reference to specific embodiments.

[0054] Example 1

[0055] like Figures 2-5 As shown, the tool in this embodiment adopts an electric structure to form an electric screwdriver structure. Of course, it can also be a manual structure, i.e., a manual screwdriver structure. The electric structure needs to be equipped with a conventional housing 3, motor 5, switch 4 and other corresponding transmission accessories. In this embodiment, the tool quick-change structure is installed at the head position of the housing 3. The motor 5 is controlled by the switch 4 to move, thereby driving the tool head 100, such as a screwdriver bit or drill bit, to work.

[0056] Specifically, the tool quick-change structure mainly consists of an output shaft 10, a guide shaft 20, an elastic body 30, a limiting component, a button body 70, and a housing 60 that accommodates the above components. It works in conjunction with a conventional clutch structure to achieve transmission with the motor 5. Specifically, the clutch structure consists of a clutch seat 91 and a gear 92. The gear 92 is driven to rotate by the motor 5, and the clutch seat 91 rotates with the gear 92. There are multiple protrusions on the end face of the clutch seat 91 and the end face of the output shaft 10. When the output shaft 10 is not in contact with the clutch seat 91 due to the elastic force of the elastic body 30, the motor 5 rotates but does not drive the output shaft 10 to rotate, that is, the motor 5 is in an idle state. When the output shaft 10 is subjected to external force and the elastic body 30 is compressed to the protrusions between the output shaft 10 and the clutch seat 91, the clutch seat 91 drives the output shaft 10 to rotate. This is the characteristic clutch structure of a screwdriver.

[0057] The guide shaft 20 guides the axial movement of the output shaft 10 on it, playing a guiding role. At the same time, the elastic body 30 cooperates with the limiting component to clamp the tool head 100, and the button body 70 enables quick installation.

[0058] Furthermore, the front part of the housing 60 is a tubular structure, which gradually expands from the front to the rear to form a trumpet-shaped structure. The front part is for the output shaft 10, the tool head 100 and the button body 70 to pass through. The output shaft 10 is hidden inside the housing 60. The rear part is connected to the housing 3 and accommodates the guide shaft 20, the elastic body 30, the limiting component and other parts.

[0059] Furthermore, the rear end of the output shaft 10 has a insertion hole for the guide shaft 20 to be inserted. The output shaft 10 can achieve linear motion along the axial direction of the guide shaft 20 and rotational motion along the circumferential direction of the guide shaft 20. The front end of the output shaft also has a hexagonal hole for the tool head 100 to be inserted. The tool head 100, the output shaft 10 and the guide shaft 20 are coaxially distributed.

[0060] Furthermore, the elastic body 30 can be a spring structure, which is coaxially sleeved on the guide shaft 20. One end abuts against the clutch seat 91 inside the housing 3, and the other end abuts against the output shaft 10. The elastic force of the elastic body 30 presses the output shaft 10 towards the button body 70, so that the end face of the output shaft 10 and the button body 70 are in contact. Of course, by pressing the button body 70, the elastic force of the elastic body 30 can be overcome, causing the output shaft 10 to move towards the guide shaft 20.

[0061] Furthermore, the limiting assembly consists of a bushing body 40 and a limiting body 50. The limiting body 50 can be made of steel ball structure. In order to cooperate with the limiting body 50, a limiting groove 101 is formed around the rear end of the tool head 100, that is, the part that is inserted into the output shaft body 10. The limiting groove 101 allows the limiting body 50 to partially enter. At the same time, a mounting hole 11 is provided on the output shaft body 10 to accommodate the limiting body 50. The mounting holes 11 are radially distributed and penetrate through the hole wall of the output shaft body 10. Here, the limiting body 50 can partially pass through the mounting hole 11 to the bushing body 40, and the limiting body 50 can partially pass through the mounting hole 11 to the limiting groove 101. That is, the diameter of the lower end of the mounting hole 11 is reduced. Therefore, the limiting body 50 will not fall into the output shaft body 10 from the mounting hole 11.

[0062] The bushing 40 is fitted onto the output shaft 10 and is fixedly connected to the housing 60. It consists of a head 41 and a body 42 arranged on the same axis. The two form a stepped structure inside. A bearing 80 is placed in the body 42 to achieve a rotatable connection with the output shaft 10.

[0063] like Figure 6 As shown, when the limiting body 50 falls freely into the mounting hole 11 and the limiting body 50 is located in the limiting groove 101 of the tool head 100, the vertex of the limiting body 50 does not protrude from the outer surface of the output shaft body 10, and there is a gap ΔA between the vertex and the inner wall of the head 41. The value of ΔA is between 0 and 0.6 mm, preferably between 0.1 and 0.3 mm.

[0064] like Figure 7 As shown, when the limiting body 50 is not in the limiting groove 101 of the tool head 100, but is pushed into the upper body 42 position by the tool head 100, there is a gap of ΔB between the apex of the limiting body 50 and the inner wall of the body 42. The value of ΔB is between 0-1mm, preferably between 0.1-0.5mm.

[0065] A conical surface is provided at the chamfered corner of the head 41. The taper ∠A of this conical surface is set between 0-60°, preferably between 5-20°. This allows the steel ball to move outward and backward simultaneously under the thrust of the tool head. As it moves backward, the diameter of the bushing body 40 gradually increases, and the steel ball moves continuously without getting stuck. It can be easily installed by directly inserting the bit.

[0066] Furthermore, one end of the button body 70 extends outward to form multiple plug-in pieces 71. Each plug-in piece 71 is provided with a guide rib 72. The tail end of each plug-in piece 71 is provided with a hook body 73. The front end of the corresponding housing 60 is provided with multiple bosses 61 and guide grooves 62. The number of bosses 61 is the same as the number of plug-in pieces 71, such as 4 in each case. The bosses 61 and the plug-in pieces 71 are in surface contact and fit together. The guide grooves 62 allow the guide ribs 72 to move. The hook bodies 73 cannot pass through the bosses 61 to the outside of the housing 60. Therefore, the button body 70 can only move inside the housing 60 and cannot detach from the housing 60.

[0067] like Figure 8-10 As shown, during installation, in the free state, the tool head 100 is inserted; pressing the tool head 100 causes it to push the limiting body 50, which in turn moves the output shaft 10 along the moving direction of the tool head 100. The elastic body 30 is compressed and moves to the larger inner diameter of the bushing 40. Under the thrust of the tool head 100, the limiting body 50 moves radially inside and outside the hole of the output shaft 10 until it no longer obstructs the tool head 100. The tool head 100 is fully inserted into the output shaft 10, and the limiting groove 101 of the tool head 100 is aligned with the position of the limiting body 50. Under the action of the elastic body 30, the output shaft 10 pushes the tool head 100 and the limiting body 50 to move until the end face of the output shaft 10 is abutted. At this time, the limiting body 50 just reaches the smaller inner diameter position of the bushing 40, and a part of the limiting body 50 is stuck in the limiting groove 101 of the tool head 100, thus securing the tool head 100.

[0068] like Figure 11-12 As shown, when disassembling the present invention, pressing the button body 70 compresses the elastic body 30, causing the output shaft body 10 and the limiting body 50 to move backward, with the limiting body 50 reaching the larger diameter of the bushing body 40; then, the tool head 100 can be pulled out by gently pulling it or by using gravity with the tool head 100 facing downward, which can realize the removal of the tool head 100 with one hand, making it very convenient and efficient when working at height or when changing the tool head 100 without tools.

[0069] Example 2

[0070] like Figure 13 As shown, in this embodiment, the button body 70 structure is eliminated, and the output shaft 10 is lengthened so that its front end, i.e. the end into which the tool head 100 is inserted, protrudes to the outside of the housing 60. Thus, the pressing action of the button body 70 can be replaced by pressing the output shaft 10.

[0071] Example 3

[0072] like Figure 14As shown, in this embodiment, the button body 70 structure is also eliminated, and the front part of the housing 60 is shortened, exposing the front end of the output shaft 10, which is the end into which the tool head 100 is inserted. Thus, the pressing action of the button body 70 can be replaced by pressing the output shaft 10.

[0073] Example 4

[0074] like Figure 15 As shown, in this embodiment, the contact fit between the button body 70 and the output shaft body 10 is replaced with a snap-fit ​​fit. That is, a hook or groove is provided at the rear end of the button body 70, and a groove or hook is provided at the corresponding position at the front end of the output shaft body 10, thereby snapping the button body 70 and the output shaft body 10 together and preventing the button body 70 from falling off. It should be noted that, at this time, both the outer wall of the button body 70 and the inner wall of the output shaft body 10 can be made of smooth structure. That is, the insert plate body 71, guide rib body 72, snap hook body 73, boss body 61 and guide groove body 62 are eliminated, and only one is a smooth cylindrical tube and the other is a smooth inner hole.

[0075] Example 5

[0076] like Figures 16-17 As shown, in this embodiment, the conical surface set at the rear position of the head 41 is removed, that is, the taper ∠A value is 0 at this time, only the chamfer is retained, which does not affect normal use.

[0077] The quick-change tool head structures in the above embodiments all have the following advantages:

[0078] (1) Inserting and removing the tool head is simple and convenient, and requires no tools.

[0079] (2) It can be operated with one hand, making it more efficient and safer.

[0080] (3) High reliability, the tool head will not fall off automatically during use.

[0081] (4) Simple structure, saving resources.

[0082] The examples, embodiments, and particular forms of the invention illustrated have been shown and described in detail in the accompanying drawings and foregoing description, and should also be considered illustrative rather than restrictive. The description of a particular feature in one embodiment does not imply that those particular features must be limited to that one embodiment. Features of one embodiment can be used in combination with features of other embodiments, as will be understood by those skilled in the art, whether or not explicitly stated. Exemplary embodiments have been shown and described, and all variations and modifications fall within the spirit of the invention and are intended to be protected.

[0083] Explanation of reference numerals in the attached figures

[0084] Steel ball component 1

[0085] Spring piece 2

[0086] Taper ∠A

[0087] Gap 1 ΔA

[0088] Gap 2 ΔB

[0089] Output shaft 10

[0090] Mounting hole 11

[0091] Guide shaft 20

[0092] Elastomer 30

[0093] Bushing body 40

[0094] Head 41

[0095] Body 42

[0096] Limiting body 50

[0097] Casing 60

[0098] Boss body 61

[0099] Guide groove 62

[0100] Button body 70

[0101] Connector body 71

[0102] Guide rib 72

[0103] Hook body 73

[0104] Bearing 80

[0105] Separator 91

[0106] Gear 92

[0107] Tool head 100

[0108] Limiting groove 101.

Claims

1. A tool head quick-change structure, characterized in that, include: The output shaft is used to house the tool head; Guide shaft used to guide the movement of the output shaft; An elastic body is used to elastically connect the guide shaft and the output shaft, wherein the output shaft can overcome the elastic force of the elastic body and move along the axial direction of the guide shaft under the action of external force; A limiting component used to limit the movement of the tool head within the output shaft body; Housing used to accommodate the output shaft and guide shaft; The limiting component includes a bushing body and a limiting body; The bushing is fitted onto the output shaft and fixedly connected to the housing, and there is a gap between the bushing and the output shaft; A limiting groove is provided around one end of the tool head that is inserted into the output shaft, and the limiting groove is for the limiting body to be engaged. The output shaft is provided with a mounting hole for accommodating a limiting body. The limiting body can partially extend through the mounting hole to the bushing body, and the limiting body can also partially extend through the mounting hole to the limiting groove. The bushing body includes a head and a body arranged coaxially, and the gap between the head and the output shaft body is smaller than the gap between the body and the output shaft body. The head has a conical surface with a taper between 5 and 20 degrees.

2. The tool head quick-change structure according to claim 1, characterized in that, The guide shaft, output shaft, and elastic body are arranged coaxially.

3. The tool head quick-change structure according to claim 1, characterized in that, A button is movably connected to one end of the housing. The button can push the output shaft under external force, and the button cannot detach from the housing under the elastic force of the elastic body.

4. The tool head quick-change structure according to claim 3, characterized in that, The button body is in contact with the output shaft body; The button body extends outward at one end to form multiple plug-in pieces, each plug-in piece is provided with a guide rib, and the tail end of each plug-in piece is provided with a hook. The housing has multiple bosses and guide grooves at one end. The bosses are in contact with the surface of the insert piece, and the guide grooves are for the movement of the guide ribs. The hook cannot pass through the bosses to the outside of the housing.

5. The tool head quick-change structure according to claim 3, characterized in that, The button body is engaged with the output shaft body.

6. The tool head quick-change structure according to claim 1, characterized in that, The end of the output shaft into which the tool head is inserted protrudes to the outside of the housing.

7. The tool head quick-change structure according to claim 1, characterized in that, The tool head is a screwdriver bit or a drill bit.

8. A tool, characterized in that, It has a tool head quick-change structure as described in any one of claims 1-7.

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