Reverse rotation limiting mechanism and nail gun

Abstract

The utility model provides a reverse rotation limiting mechanism and a nail gun, the reverse rotation limiting mechanism comprises a rotating shaft piece, a limiting disc, a direction stopping pin and a direction stopping driving piece, the rotating shaft piece is provided with limiting teeth in the circumferential direction, the rotating shaft piece is arranged in a receding hole of the limiting disc in a penetrating mode, and the direction stopping pin is contained in a containing groove in the limiting disc; one-way rotation of a part installed on the rotating shaft piece is achieved through radial movement of the direction stopping pin in the containing groove along the rotating shaft piece and cooperation of the direction stopping pin and the multiple limiting teeth, namely, the direction stopping pin and movement of the direction stopping pin are limited within the diameter range of the limiting disc, and the space outside the limiting disc does not need to be occupied; the limiting disc is provided with the containing groove for the direction stopping pin to move and providing movement guiding, and the distance between the limiting disc and the rotating shaft piece can be set to be very small, so that compared with a traditional ratchet mechanism, the reverse rotation limiting mechanism has the advantages that the overall size is greatly reduced, the functions of one-way rotation and reverse rotation limiting can be practically achieved, and the practicability is high. The device can be applied to small-sized equipment with the portable requirement and the handheld operation requirement.

Description

Technical Field

[0001] The utility model belongs to the technical field of limiting mechanisms, and in particular relates to a reversal limiting mechanism and a nail gun. Background Art

[0002] In some devices, a one-way rotating component is provided, that is, under the drive of the corresponding driving mechanism, the one-way rotating component rotates in a predetermined direction, while the rotation in the opposite direction is restricted or completely prevented. For example, in some nail guns, a steel spring is used as an energy storage component, a piston is installed at one end of the steel spring, a firing pin is installed on the piston, and the one-way rotating component is a cam. Under the drive of the motor, the cam rotates in a specified direction, and the protrusion on the cam pushes the piston to move in the direction of the steel spring, thereby compressing the steel spring to store energy. In such a nail gun, in order to avoid the accidental firing of nails due to the reverse rotation of the cam and to ensure safety during use, it is necessary to prevent the cam from reversing.

[0003] At present, some of these nail guns do not have a reverse limiting mechanism, which poses a safety hazard; another part of these nail guns use a one-way bearing, which plays a role in reverse limiting, but the cost of the one-way bearing is relatively high. Although there are other reverse limiting mechanisms such as ratchet mechanisms in the prior art, they are difficult to use in nail guns. The main reason is that as a handheld tool, the size of a nail gun is strictly limited. Its overall size and weight must be kept within the range that most people can conveniently hold and operate with one hand. Therefore, the space inside the nail gun is very limited, and a larger ratchet mechanism cannot be used. Utility Model Content

[0004] The utility model is designed to solve the above problems, and aims to provide a reverse limiting mechanism with a simplified structure and a small size, so that it can be well set in a nail gun. The utility model adopts the following technical solutions:

[0005] The utility model provides a reverse limiting mechanism, which has the following technical features: a rotating shaft member, which is used to drive the member to rotate; a limiting disk, which has a clearance hole located in the middle thereof and a receiving groove connected to the clearance hole, the rotating shaft member passes through the clearance hole, and the receiving groove extends along the radial direction of the rotating shaft member; a stop pin, which is arranged in the receiving groove and can move along its extension direction; and a stop driving member, which is used to drive the stop pin to move toward the rotating shaft member, wherein the outer periphery of the rotating shaft member has a plurality of limiting teeth extending along its axial direction, and the end of the stop pin facing the rotating shaft member has: a stop mating surface, which is parallel to the radial direction of the rotating shaft member, and is used to abut against the limiting teeth when the rotating shaft member is subjected to a reverse driving force to prevent the rotating shaft member from rotating in the reverse direction; and a rotating mating surface, which is inclined relative to the radial direction of the rotating shaft member, and is used to abut against the limiting teeth when the rotating shaft member is subjected to a forward driving force, so as to press the stop pin toward the receiving groove, so that the rotating shaft member can rotate in the forward direction.

[0006] The reverse limiting mechanism provided by the utility model may also have such a technical feature, wherein the stop pin is columnar, and its side surface includes a cylindrical surface and a plane, and the cross-sectional shape of the accommodating groove along its extension direction matches the axial cross-sectional shape of the stop pin.

[0007] The reverse limiting mechanism provided by the utility model may also have such a technical feature, which also includes a bearing, wherein the limiting disk has a main body cover portion in the shape of a circular cover, the clearance hole is arranged in the middle of the top of the main body cover portion, the accommodating groove is arranged in the top of the main body cover portion, and its notch is located on the inner surface of the top of the main body cover portion, the rotating shaft member has a disc-shaped rotating shaft mounting disk portion and a columnar rotating shaft column portion, the multiple limiting teeth are arranged on the rotating shaft column portion, the bearing is sleeved on the rotating shaft column portion, and the upper surface of the bearing is in contact with the inner surface of the top of the main body cover portion, and the lower surface of the bearing is in contact with the upper surface of the rotating shaft mounting disk portion.

[0008] The reverse limiting mechanism provided by the utility model may also have such a technical feature, which also includes a bearing, wherein the limiting disk also has a plurality of mounting block portions extending from the side of the main body cover portion, each of the mounting block portions is provided with a mounting hole, and the upper end edge of the main body cover portion has a plurality of arc-shaped clearance notches, which are respectively located next to each of the mounting block portions.

[0009] The reverse limiting mechanism provided by the utility model may also have such a technical feature, wherein a limiting groove is formed between two adjacent limiting teeth, and the limiting groove has a first side surface and a second side surface, and the first side surface and the second side surface are both parallel to the axial direction of the rotating shaft, and the first side surface is used to abut against the stop mating surface when the rotating shaft is subjected to the reverse driving force to prevent the reverse rotation, and the second side surface is used to abut against the rotating mating surface when the rotating shaft is subjected to the forward driving force, so that the stop pin is subjected to the component force of the forward driving force along the radial direction toward the accommodating groove, thereby pressing the stop pin toward the accommodating groove.

[0010] The reverse rotation limiting mechanism provided by the utility model may also have such technical features, wherein the first side surface is parallel to the radial direction of the rotating shaft, the inclination angle of the second side surface relative to the corresponding first side surface is 30°~45°, and the inclination angle of the rotating mating surface relative to the radial direction of the rotating shaft is 30°~80°.

[0011] The reverse limiting mechanism provided by the utility model may also have such a technical feature, wherein one end of several of the multiple limiting teeth has a driving surface, the driving surface is a plane perpendicular to the radial direction of the rotating shaft, and the vertical distance from the driving surface to the central axis of the rotating shaft is smaller than the vertical distance from the outer end surface of the other limiting teeth to the central axis, the several driving surfaces are distributed on both sides of the rotating shaft, and the multiple driving surfaces located on the same side are coplanar.

[0012] The reverse limiting mechanism provided by the utility model may also have such technical features, which also includes a bearing, wherein the stop pin includes: a metal part, which is columnar, one end of which has a plane inclined relative to its axial direction, and one side surface of the metal part is the stop mating surface; and a noise reduction layer, which is a modified plastic part, arranged on the plane of the metal part, and the outer surface of the noise reduction layer is the rotational mating surface.

[0013] The reverse limiting mechanism provided by the utility model may also have such a technical feature, which also includes a bearing, wherein the anti-rotation driving member is an elastic member, which is arranged in the accommodating groove, one end of which abuts against the bottom of the accommodating groove, and the other end abuts against the anti-rotation pin, and the elastic member is any one of a spring, a metal sheet strip with one or more bending parts, a columnar rubber part, and a columnar rubber-plastic part.

[0014] The utility model provides a nail gun, which has the following technical features: an elastic component; a rotating component, which is used to compress the elastic component and store energy by rotating; a rotation driving mechanism, which is used to drive the rotating component to rotate; and the above-mentioned reverse limiting mechanism, which is used to make the rotating component rotate in one direction.

[0015] Function and effect of utility model

[0016] According to the reverse limiting mechanism and nail gun provided by the utility model, the reverse limiting mechanism includes a circumferentially limited-toothed rotating shaft, a limiting disk, a stop pin and a stop driving member, the rotating shaft is inserted into the clearance hole of the limiting disk, the stop pin is accommodated in the accommodating groove on the limiting disk, and the one-way rotation of the component installed on the rotating shaft is achieved by the stop pin moving radially in the accommodating groove along the rotating shaft, and the cooperation between the stop pin and the plurality of limited teeth, that is, the stop pin and its movement are limited within the diameter range of the limiting disk, and do not need to occupy the space outside the limiting disk, and by providing an accommodating groove on the limiting disk for the stop pin to move and provide a moving guide, the spacing between the limiting disk and the rotating shaft can be set very small, so compared with the traditional ratchet mechanism, the overall size of the reverse limiting mechanism of the utility model is greatly reduced, and it can also effectively realize the functions of one-way rotation and reverse limiting, and can be applied to small devices with portable needs and handheld operation needs. In addition, the reverse limiting mechanism of the utility model also has the advantages of simple structure, small number of components, easy assembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a side view of the structure of the nail gun in the first embodiment of the utility model;

[0018] Figure 2 It is a three-dimensional diagram of the driving unit in the first embodiment of the utility model;

[0019] Figure 3 It is a three-dimensional diagram of the reverse limiting mechanism in the first embodiment of the utility model;

[0020] Figure 4 It is a cross-sectional view of the reverse limiting mechanism and the reducer structure in the first embodiment of the utility model;

[0021] Figure 5 It is a three-dimensional diagram of the rotating shaft member in the first embodiment of the utility model;

[0022] Figure 6 It is an orthographic projection diagram of the rotating shaft member in the first embodiment of the utility model;

[0023] Figure 7 yes Figure 6 An enlarged view of the portion within the middle frame A;

[0024] Figure 8 It is a three-dimensional diagram of the limiting disk in the first embodiment of the utility model;

[0025] Fig. 9 It is a three-dimensional diagram of different angles of the limiting disk in the first embodiment of the utility model;

[0026] Fig.10 It is a three-dimensional diagram of the stop pin in the first embodiment of the utility model;

[0027] Fig.11 It is a cross-sectional view of the stop pin in the first embodiment of the utility model;

[0028] Fig.12 It is an orthographic projection diagram of the stop pin in the first embodiment of the utility model;

[0029] Fig.13 It is a cross-sectional view of the reverse limiting mechanism in the first embodiment of the present utility model in the use state;

[0030] Fig.14 It is a three-dimensional diagram of the stop pin in the second embodiment of the utility model;

[0031] Fig.15 It is a side view of a stop-return driving member in a first modification of the utility model.

[0032] Reference numerals:

[0033] Nail gun 1000; drive unit 100; reverse limiting mechanism 10; rotating shaft 11; rotating shaft mounting plate portion 111; rotating shaft mounting hole 1111; rotating shaft column portion 112; limiting tooth 1121; limiting groove 1122; first side surface 1122a; second side surface 1122b; strip-shaped notch 11211; driving surface 1121a; rotating shaft end portion 113; first annular groove 114; second annular groove 115; limiting plate 12; main body cover portion 121; giving hole 1211; containing groove 1212; spring abutting surface 1212a; giving notch 1214; mounting block portion 122; limiting plate mounting hole 1221; stop pin 13; cylindrical surface 13a; limiting surface 13b; outer end surface 13c; Spring limit groove 131; stop drive member 14; bearing 15; rotating member 20; cam plate 21; push member 22; rotating drive mechanism 30; motor 31; motor end cover 32; reducer 33; reducer housing 331; input gear shaft 332; first-stage gear 333; first-stage toothed disc 334; second-stage gear 335; second-stage toothed disc 336; third-stage gear 337; energy storage firing unit 200; guide limit rod 210; energy storage spring 220; piston 230; piston fitting part 231; firing pin 240; gun nozzle unit 300; nail magazine unit 400; shell 500; upper main body part 510; lower main body part 520; handle part 530; columnar part 540. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the reverse limiting mechanism and the nail gun of the present invention are specifically described below in conjunction with the embodiments and drawings.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] <Example 1>

[0037] Figure 1 It is a side view of part of the structure of the nail gun in this embodiment. In order to show the internal structure of the nail gun, part of the shell structure is omitted in the figure.

[0038] like Figure 1 As shown, the nail gun 1000 includes a housing 500, a driving unit 100, an energy storage firing unit 200, a gun nozzle unit 300, and a nail magazine unit 400. The driving unit 100 is used to drive the energy storage firing unit 200 to store energy, and then the energy storage firing unit 200 fires the nails at the gun nozzle unit 300 by releasing the stored energy. The nail magazine unit 400 is used to continuously supply nails to the gun nozzle unit 300.

[0039] Except for the driving unit 100 , the other units may adopt the structures in the prior art, so they are not described in detail. Only the parts related to the driving unit 100 are described below.

[0040] The energy storage firing unit 200 includes a guide limit rod 210, one or more energy storage springs 220, a piston 230, and a firing pin 240. The energy storage spring 220 is mounted on the guide limit rod 210, one end of which abuts against the annular limit plate portion of the guide limit rod 210 at one end of the gun tail, and the other end of the energy storage spring 220 abuts against the piston 230. The piston 230 is mounted on the guide limit rod 210 and can move along the axial direction thereof, and the end of the piston 230 facing the drive unit 100 has a piston mating portion 231 protruding outward.

[0041] The shell 500 is generally in the shape of a square ring, and the gun nozzle unit 300 and the nail magazine unit 400 are installed on one side of the shell 500. The shell 500 includes an upper main body part 510, a lower main body part 520, and a handle part 530 and a columnar part 540 connected therebetween. Corresponding cavities are formed in these four parts respectively, and the four cavities are connected in sequence as shown in the figure. The upper main body part 510 is used to accommodate the energy storage firing unit 200, the lower main body part 520 is used to accommodate the power switch and circuit board, etc., the handle part 530 is mainly used for the user to hold and is provided with a trigger, etc., and the columnar part 540 is used to accommodate the drive unit 100. It can be seen that the space inside the columnar part 540 is very limited, especially the inner diameter is small.

[0042] Figure 2 is a three-dimensional diagram of the driving unit in this embodiment.

[0043] like Figure 2 As shown, the driving unit 100 includes a reverse rotation limiting mechanism 10 , a rotating member 20 , and a rotation driving mechanism 30 .

[0044] The rotating component 20 is a cam, which includes a special-shaped cam disc 21, two cylindrical pushers 22, and fasteners such as a pressing plate. The two pushers 22 have different heights and can respectively cooperate with different parts of the piston matching part 231 of the piston 230, so that during the process of the cam rotating one circle, the piston 230 is pushed toward the energy storage spring 220 by the two pushers 22 in turn, so as to realize two-stage compression energy storage. When the two-stage compression energy storage is completed and the piston 230 is at the highest energy storage position, the pusher 22 with a higher height abuts against the piston matching part 231 of the piston 230. At this time, the piston 230 applies a driving force along the nail-out direction to the pusher 22, and at this time, the direction of the line connecting the pusher 22 and the rotation center of the cam disc 21 is often inconsistent with the nail-out direction, and may be inclined relative to the nail-out direction. Therefore, the driving force will try to drive the rotating component 20 to rotate in the opposite direction, thereby causing the problem of insufficient energy storage or even misfiring. Therefore, it is necessary to limit the reverse rotation of the rotating component 20.

[0045] The rotary drive mechanism 30 includes a motor 31, a motor end cover 32 and a reducer 33. The motor end cover 32 is fixedly mounted on the upper end surface of the motor 31, the output shaft of the motor 31 extends from the through hole in the middle of the motor end cover 32, and the input end of the reducer 33 is connected to the output shaft of the motor 31. The rotating component 20 is mounted on the reducer 33 through the reverse rotation limiting mechanism 10, and the reverse rotation limiting mechanism 10 allows the rotating component 20 to rotate only in a predetermined working rotation direction.

[0046] Figure 3 : is a three-dimensional diagram of the reverse limiting mechanism in this embodiment, Figure 4 is a cross-sectional view of the reverse limiting mechanism and the reducer structure in this embodiment, Figure 4 The reducer housing is omitted.

[0047] like Figure 3 and Figure 4 As shown, the reverse rotation limiting mechanism 10 includes a rotating shaft 11 , a limiting disk 12 , a stop pin 13 , a stop driving member 14 and a bearing 15 .

[0048] Figure 5 is a three-dimensional diagram of the rotating shaft member in this embodiment, Figure 6 is an orthographic projection diagram of the rotating shaft member in this embodiment, Figure 7 yes Figure 6 An enlarged view of the portion within frame A.

[0049] like Figures 5 to 7 As shown, the rotating shaft member 11 includes a rotating shaft mounting disc portion 111 , a rotating shaft column portion 112 and a rotating shaft end portion 113 which are integrally formed and coaxially arranged in sequence.

[0050] The rotating shaft mounting plate portion 111 is in the shape of a disk as a whole, and a plurality of through rotating shaft mounting holes 1111 (four in this embodiment) are evenly distributed along the circumference of the edge portion of the rotating shaft mounting plate portion 111, which are used to mount the rotating shaft member 11 on the reducer 33 through a connecting member. The upper surface of the rotating shaft mounting plate portion 111 (the surface connected to the rotating shaft column portion 112) is a plane perpendicular to the axial direction of the rotating shaft member 11.

[0051] In this embodiment, the reducer 33 is a three-stage planetary gear reducer, which has a reducer housing 331 (whose inner wall has an outer gear ring), an input gear shaft 332, a plurality of first-stage gears 333, a first-stage toothed disc 334, a plurality of second-stage gears 335, a second-stage toothed disc 336, and a plurality of third-stage gears 337. The specific structure of the gear set in the three-stage planetary gear reducer is the prior art and will not be described in detail. The shaft mounting disc 111 is connected to one or more third-stage gears 337 through a cylindrical connecting pin passing through one or more shaft mounting holes 1111, and the shaft member 11 rotates under the drive of the third-stage gears 337.

[0052] The shaft column 112 is generally columnar in shape, extending from the middle of the other surface of the shaft mounting plate 111 perpendicular to the surface direction of the shaft mounting plate 111, and is coaxially arranged with the shaft mounting plate 111. A small section of the shaft column 112 close to the shaft mounting plate 111 is cylindrical, and the rest of the shaft column 112 is gear-shaped.

[0053] like Figure 7As shown, the outer circumference of the shaft column 112 has a plurality of limiting teeth 1121 arranged in sequence along a circumference. When viewed from the axial direction of the shaft column 112, the cross-sectional shape of the limiting teeth 1121 is roughly trapezoidal, with the short side of the trapezoid facing outward and the short side being arc-shaped. A limiting groove 1122 is formed between two adjacent limiting teeth 1121, which is used to cooperate with the stop pin 13 to achieve unidirectional rotation of the shaft member 11. The limiting groove 1122 extends along the axial direction of the shaft column 112. When viewed from the axial direction of the shaft column 112, the cross-sectional shape of the limiting groove 1122 is triangular, and one corner of the triangle is the groove bottom of the limiting groove 1122. The limiting groove 1122 has a first side surface 1122a and a second side surface 1122b, both of which are parallel to the axial direction of the shaft column 112. The first side surface 1122a is parallel to the radial direction of the rotating shaft 11, the second side surface 1122b is inclined relative to the radial direction of the rotating shaft 11, the angle between the second side surface 1122b and the corresponding first side surface 1122a is an acute angle, and the inclination angle of the second side surface 1122b relative to the radial direction of the rotating shaft 11 is 30° to 45°. It can be understood that the first side surface 1122a and the second side surface 1122b are also two side surfaces (tooth surfaces) of the limiting tooth 1121.

[0054] In this embodiment, the shaft column portion 112 has a total of fifteen position-limiting teeth 1121, which have the same shape, size and spacing. The second side surface 1122b has an inclination angle of 45° relative to the radial direction of the shaft member 11.

[0055] In addition, a strip-shaped notch 11211 is provided on one end of some of the limiting teeth 1121 close to the shaft end 11, so that these limiting teeth 1121 have a driving surface 1121a that is recessed relative to other limiting teeth 1121, and all driving surfaces 1121a are parallel to each other and distributed on both sides of the radial direction of the shaft column portion 112, and multiple driving surfaces 1121a on the same side are coplanar, and the inner ring of the cam disk 21 has a cam mounting hole, and the inner wall of the cam mounting hole has two parallel planes, so that the inner wall shape of the cam mounting hole matches the outer peripheral shape of the shaft column portion 112 with the driving surface 1121a, so that the cam can be driven to rotate synchronously through the multiple driving surfaces 1121a of the shaft member 11.

[0056] In this embodiment, four of the limiting teeth 1121 are provided with notches 11211, which are respectively arranged on both sides of the shaft column 112 in the radial direction. The remaining plurality of limiting teeth 1121 are provided with chamfers on their ends close to the shaft end 11.

[0057] In an alternative solution, the cross-section of the limiting tooth 1121 may also be a trapezoid with rounded corners; the cross-section of the limiting groove 1122 may also be a triangle with rounded corners or a trapezoid, as long as it still has the first side surface and the second side surface.

[0058] The shaft end portion 113 is generally cylindrical in shape and has a diameter smaller than that of the shaft column portion 112 . Its axial length is also much smaller than that of the shaft column portion 112 . The edge of the outer end of the shaft end portion 113 is chamfered.

[0059] In addition, a first annular groove 114 is formed between the shaft column 112 and the shaft mounting plate 111, and the circumferential cross section of the first annular groove 114 is approximately trapezoidal. A second annular groove 115 is formed between the shaft column 112 and the shaft end 113, and the circumferential cross section of the second annular groove 115 is also approximately trapezoidal.

[0060] Figure 8 is a three-dimensional diagram of the limiting disk in this embodiment, Fig. 9 It is a stereoscopic diagram of the limiting disk at different angles in this embodiment.

[0061] like Figure 8 and Fig. 9 As shown, the limiting plate 12 includes a main body cover portion 121 and a plurality of mounting block portions 122 which are integrally formed.

[0062] The main body cover 121 is generally in the shape of a circular cover, and has a through-hole 1211 in the middle of its top surface, and the diameter of the hole 1211 is larger than the maximum outer diameter of the shaft column 112. The top of the main body cover 121 has a certain thickness, and a receiving groove 1212 connected to the hole 1211 is provided on the inner surface of the top to accommodate the stop pin 13. The receiving groove 1212 extends along the radial direction of the main body cover 121, one end in the extending direction is connected to the hole 1211, and the other end in the extending direction is a spring abutment surface 1212a perpendicular to the radial direction of the main body cover 121. The notch of the receiving groove 1212 is located on the inner surface of the top of the main body cover 121, the notch is rectangular, the bottom of the groove is generally a cylindrical surface, and the two side surfaces connected to the bottom of the groove are parallel planes.

[0063] In an alternative solution, a circular shallow groove may be further provided on the spring abutment surface 1212a to limit one end of the spring.

[0064] The mounting block 122 further extends outward from the side of the main body cover 121, and its extension direction is the radial direction of the main body cover 121. The mounting block 122 is roughly in the shape of a rectangular block with rounded corners, and each mounting block 122 is provided with a through limiting disk mounting hole 1221, and the through direction of the limiting disk mounting hole 1221 is the axial direction of the limiting disk 12. The connection position between the mounting block 122 and the side of the main body cover 121 is in an arc shape. In addition, in this embodiment, the outer end face 122a of the mounting block 122 is perpendicular to the axial direction of the limiting disk 12, and the outer end face 122a has a smaller curvature. The upper edge of the main body cover 121 also has a plurality of clearance notches 1214, which are respectively located beside each mounting block 122, and the clearance notches 1214 are arc-shaped notches, so that the limiting disk mounting hole 1221 can be set closer to the main body cover 121. In this embodiment, the limiting disk mounting hole 1221 is a countersunk hole.

[0065] Fig.10 : is a three-dimensional diagram of the stop pin in this embodiment, Fig.11 is a cross-sectional view of the stop pin in this embodiment, Fig.12 It is an orthographic projection diagram of the stop pin in this embodiment.

[0066] like Figures 10 to 12 As shown, the stop pin 13 is in the shape of a cylinder with a missing part. For the convenience of description, the axial and radial directions of the corresponding complete cylinder are taken as the axial and radial directions of the stop pin 13. The cross section of the stop pin 13 in the axial direction is D-shaped, and its side surface includes a cylindrical surface 13a and a limiting surface 13b. The limiting surface 13b is a plane perpendicular to the radial direction of the stop pin 13. One end of the stop pin 13 in the axial direction has a plane inclined relative to its axial direction, which is the outer end surface 13c. The outer end surface 13c has an inclination angle of 30° to 80° relative to the axial direction of the stop pin 13, and is 60° in this embodiment. That is, when mating with the rotating shaft 11, the inclination angle of the outer end surface 13 relative to the circumferential tangent of the rotating shaft column 112 is 10° to 60°, and is 30° in this embodiment. In this embodiment, the outer end surface 13c is a rotational mating surface, and the cylindrical surface 13a portion corresponding to the outer end surface 13c at one end is a stop mating surface. The other end of the stop pin 13 in the axial direction is provided with a spring limiting groove 131 , which is a circular groove with a conical bottom.

[0067] The stop pin 13 is a metal part, and the metal material itself has wear resistance, or the metal material has wear resistance through a heat treatment process, so that the stop pin 13 is not easy to be obviously worn during long-term use, thereby improving the stability of the reverse limiting mechanism 10 during operation. In this embodiment, the stop pin 13 is an iron part, and the heat treatment process makes it wear-resistant.

[0068] In an alternative solution, the stop pin 13 may also be made of a polymer wear-resistant and impact-resistant modified material (ie, modified plastic), which has certain wear resistance and can also reduce the noise during the operation of the reverse limiting mechanism 10.

[0069] The shape of the above-mentioned receiving groove 1212 matches the shape of the stop pin 13. When the stop pin 13 is set in the receiving groove 1212 and its cylindrical surface 13a is roughly in contact with the inner wall of the receiving groove 1212, the limiting surface 13b of the stop pin 13 is roughly flush with the notch of the receiving groove 1212.

[0070] In an alternative solution, the side of the stop pin 13 may also have more limiting surfaces 13b, for example, two limiting surfaces 13b, and the shape of the receiving groove 1212 matches them. Alternatively, the stop pin 13 may also be in the shape of a square column. Alternatively, the stop pin 13 may also be in the shape of a special-shaped column, for example, a cylindrical shape with a boss, and the receiving groove 1212 may have a groove corresponding to the boss.

[0071] The stop driving member 14 is used to drive the stop pin 13 to move along its axial direction toward the outside of the receiving groove 1212 (ie, toward the direction of the clearance hole 1211), so as to press one end of the stop pin 13 into one of the limiting grooves 1122. In this embodiment, the stop driving member 14 is a spring.

[0072] The overall shape of the bearing 15 is an oblate cylindrical shape, and a through bearing hole is provided in the middle thereof. The specific structure of the bearing 15 is prior art and will not be described in detail. In this embodiment, the diameter of the bearing hole matches the outer diameter of the cylindrical portion of the shaft column 112, and the overall outer diameter of the bearing 15 is close to or consistent with the outer diameter of the shaft mounting plate portion 111. The depth of the main body cover portion 121 of the limiting plate 12 is approximately half of the axial height of the bearing 15.

[0073] Fig.13 It is a cross-sectional view of the reverse limiting mechanism in the present embodiment when it is in use.

[0074] like Fig.13As shown, after the assembly is completed, the shaft column 112 of the shaft member 11 passes through the clearance hole 1211 in the middle of the limiting disk 12, and the shaft member 11 and the limiting disk 12 are coaxially arranged, and in the radial direction of both, the receiving groove 1212 faces the limiting tooth 1121. The stop pin 13 is arranged in the receiving groove 1212, and its outer end face 13c faces the clearance hole 1211, and the spring limiting groove 131 faces the spring abutting surface 1212a. The stop driving member 14 (spring) is also arranged in the receiving groove 1212, one end of which is located in the spring limiting groove 131 and abuts against the bottom of the groove, and the other end abuts against the spring abutting surface 1212a. The bearing 15 is mounted on the shaft column 112 of the shaft member 11, and the upper end of the bearing 15 is accommodated in the main body cover 121 of the limiting disk 12. The upper surface of the bearing 15 contacts the top inner surface of the main body cover 121, thereby closing the notch of the accommodating groove 1212. The cylindrical surface 13a of the stop pin 13 contacts the inner wall of the accommodating groove 1212, and the limiting surface 13b (plane) is roughly in contact with the upper surface of the bearing 15, thereby limiting the stop pin 13 and preventing it from axial rotation.

[0075] In addition, if Figure 1 As shown, the reducer housing 331 of the reducer 33 is polygonal in shape and is stuck in the housing of the nail gun, so it will not rotate axially. The limiting plate 12 is fixed to the upper end of the reducer housing 331 by fasteners, so it will not rotate axially. The axial upper end of the bearing 15 is roughly embedded in the main body cover portion 121 of the limiting plate 12, and the lower end is roughly embedded in the circular hole at the upper end of the reducer housing 331. The shaft mounting plate portion 111 of the shaft member 11 is embedded in the upper end of the reducer housing 331. That is, the reverse limiting mechanism 10 is also used as the upper end cover of the reducer 33.

[0076] Under the action of the stop drive member 14 (spring), the stop pin 13 is pushed out toward the outside of the accommodating groove 1212 along its length direction (that is, the radial direction of the rotating shaft member 11 and the limiting disk 12), and one wedge-shaped end of the stop pin 13 is embedded and pressed toward one of the limiting grooves 1212, and the cylindrical surface 13a part (stop mating surface) at this end faces the first side surface 1122a (a straight surface parallel to the radial direction), and the outer end surface 13c (rotating mating surface) faces the second side surface 1122b (an inclined surface inclined relative to the radial direction).

[0077] When the rotation drive mechanism 30 applies a positive driving force to the rotating shaft 11 to rotate along the working rotation direction D1, the rotating shaft 11 tries to rotate under the action of this force, and the second side surface 1122b on the rotating shaft 11 contacts the outer end surface 13c (rotational matching surface) of the stop pin 13, that is, two inclined surfaces inclined relative to the radial direction contact each other, and the component force along the radial direction of the positive driving force on the two inclined surface contact parts overcomes the spring force to push the stop pin 13 into the receiving groove 1212, so that the rotating shaft 11 can rotate along the D1 direction. The spring force of the stop driving member 14 (spring) is designed according to factors such as the inclination angle of the rotational matching surface, the inclination angle of the second side surface 1213b, the length of the stop pin 13, and the size of the positive driving force, so that when the positive driving force is applied, the component force along the radial direction is greater than the spring force.

[0078] When the rotary drive mechanism 30 applies a reverse driving force to the rotating shaft 11 to rotate in a direction opposite to the working rotation direction D1, the rotating shaft 11 attempts to rotate in the reverse direction under the action of this force, and the first side surface 1122a on the rotating shaft 11 contacts the cylindrical surface 13a part (stop mating surface) of the wedge-shaped end of the stop pin 13, that is, two surfaces parallel to the radial direction are in contact. Therefore, the above-mentioned reverse driving force will not generate a component force in the radial direction on the contact parts of these two surfaces, and therefore the stop pin 13 will not be pushed into the accommodating groove 1212. The first side surface 1122a abuts against the stop mating surface, making it impossible for the rotating shaft 11 to rotate in the reverse direction.

[0079] Functions and Effects of Embodiment 1

[0080] According to the reverse limiting mechanism and nail gun provided by the present embodiment, the reverse limiting mechanism includes a rotating shaft member with a limiting tooth in the circumferential direction, a limiting disk, a stop pin and a stop driving member, the rotating shaft member is inserted into the clearance hole of the limiting disk, the stop pin is accommodated in the accommodating groove on the limiting disk, and the one-way rotation of the member installed on the rotating shaft member is realized by the stop pin moving radially in the accommodating groove along the rotating shaft member, and the cooperation between the stop pin and the plurality of limiting teeth, that is, the stop pin and its movement are both limited within the diameter range of the limiting disk, and do not need to occupy the space outside the limiting disk, and by providing an accommodating groove on the limiting disk for the stop pin to move and provide a moving guide, the spacing between the limiting disk and the rotating shaft member can be set very small, so compared with the traditional ratchet mechanism, the overall size of the reverse limiting mechanism of the present embodiment is greatly reduced, and it can also effectively realize the functions of one-way rotation and reverse limiting, and can be applied to small devices with portable needs and handheld operation needs. In addition, the reverse limiting mechanism of the present embodiment also has the advantages of simple structure, small number of components, easy assembly and maintenance.

[0081] In the embodiment, the limiting tooth has a first side surface and a second side surface, the first side surface is parallel to the radial direction, and the second side surface is inclined relative to the radial direction. Therefore, when the rotating shaft is subjected to a positive driving force, the two inclined surfaces of the second side surface and the rotational mating surface of the stop pin cooperate to generate a radial component force on the stop pin toward the accommodating groove, and the stop pin can be pressed into the accommodating groove, so that the rotating shaft can rotate forward basically without hindrance; and when the rotating shaft is subjected to a reverse driving force, the two straight surfaces of the first side surface and the stop mating surface of the stop pin cooperate to basically not generate a component force in the radial direction, and the abutment of the two straight surfaces can effectively prevent the rotating shaft from rotating in the reverse direction.

[0082] Furthermore, the cross section of the check pin is D-shaped, and its side has a plane, and the shape of the accommodating groove is adapted thereto, thereby preventing the check shaft from rotating in its axial direction when it moves, and maintaining the stability of the reverse limiting mechanism when it is working.

[0083] Furthermore, the receiving groove is provided at the top lower surface of the main body cover of the limiting disk, and a semi-enclosed groove matching the stop pin is formed by cooperating with the bearing, so that the processing of the receiving groove and the assembly of the stop pin and the stop driving member (spring) are easier. In addition, by arranging a bearing between the limiting disk and the rotating shaft, and one axial end of the bearing is roughly fitted with the limiting disk, and the other end is roughly fitted with the reducer housing, the coaxiality of the reducer and the reverse limiting mechanism is better.

[0084] Furthermore, in the embodiment, the rotating shaft has a rotating shaft mounting disk portion and a rotating shaft column portion, so it can be conveniently connected to the reducer through the rotating shaft mounting disk portion; the limiting disk includes a main body cover portion in the shape of a circular cover and a plurality of mounting block portions, and the gear hole is opened in the middle of the top surface of the main body cover portion, so the limiting disk can also be used as the upper end cover of the reducer, so that the number of components of the unidirectional rotating device is reduced and the assembly is more convenient.

[0085] <Example 2>

[0086] This embodiment provides a reverse limiting mechanism and a corresponding nail gun. In this embodiment, the same symbols are given to the same components as those in the first embodiment and the corresponding descriptions are omitted.

[0087] Compared with the first embodiment, the structure of the stop pin 13 of this embodiment is different.

[0088] Fig.14 It is a three-dimensional view of the stop pin in this embodiment.

[0089] like Fig.14As shown, the stop pin 13 of this embodiment also includes a noise reduction layer 133. The noise reduction layer 133 is a thin sheet-like piece with a certain thickness and is arranged on the outer end surface 132e. The noise reduction layer 133 is made of the above-mentioned polymer wear-resistant and impact-resistant modified material and is formed on the outer end surface 132e through injection molding or wrapping technology. It can cover substantially the entire outer end surface 132e, or cover most of the area in the middle of the outer end surface 132e.

[0090] In this embodiment, the outer surface 133a of the noise reduction layer 133 is a rotational mating surface.

[0091] The stop pin body portion 131 and the matching portion 132 of the stop pin 13 are made of wear-resistant metal material in one piece, that is, a metal part.

[0092] When a positive driving force is applied to the rotating shaft 11 in the direction D1, the outer surface 133a (rotational mating surface) of the noise reduction layer 133 of the stop pin 13 contacts the second side surface 1122b (inclined surface), thereby reducing noise during operation.

[0093] When a reverse driving force is applied to the shaft 11 to rotate in the opposite direction to the D1 direction, the third arc surface 132c (stop mating surface) of the shaft 11 contacts the first side surface 1122a (straight surface), that is, the metal part abuts against the limiting tooth 121.

[0094] In this embodiment, other structures are the same as those in the first embodiment, and thus will not be described again.

[0095] Example 2 Function and Effect

[0096] According to the reversal limiting mechanism and nail gun provided in this embodiment, on the basis of the functions and effects of the first embodiment, since the check pin adopts the form of a combination of a main metal part and a modified material layer, the modified material layer at the outer end can make the noise during operation smaller, and the main metal part can achieve good wear resistance, so that the reversal limiting mechanism has better stability during long-term use, and can also reduce the frequency of disassembly and maintenance of the mechanism and replacement of parts, so that the user experience is better.

[0097] <Modification 1>

[0098] This variation provides a reverse limiting mechanism and a corresponding nail gun. In this variation, the same symbols are given to the same components as those in the first embodiment and the corresponding descriptions are omitted.

[0099] Compared with the first embodiment, the structure of the non-return driving member 14 of this variation is different.

[0100] Fig.15 It is a side view of the non-return driving member in this modification.

[0101] like Fig.15 As shown, the stop driving member 14 is a bent metal sheet strip having one or more bent portions 141. In this embodiment, the stop driving member 14 has one bent portion 141 and is V-shaped as a whole. The stop driving member 14 is also arranged in the receiving groove 1212, one end of which abuts against the spring abutting surface 1212a, and the other end abuts against the bottom of the spring limiting groove 131 at one end of the stop pin 13. The bottom of the receiving groove 1212 and the end surface of the one end of the stop pin 13 can also be modified according to the structure of the stop driving member 14, so that the stop driving member 14 can be installed therein more stably.

[0102] When the stop pin 13 is subjected to a force radially toward the accommodating groove 1212, the stop driving member 14 deforms (i.e., the angle of the V-shape becomes smaller) to cause the stop pin 13 to move toward the accommodating groove 1212; when the stop pin 13 is no longer subjected to the above force, the stop driving member 14 provides a force to push the stop pin 13 out by deforming and resetting.

[0103] In this variation, other structures are the same as those in the first embodiment, and thus will not be described again.

[0104] <Modification 2>

[0105] This variation provides a reverse limiting mechanism and a corresponding nail gun. In this variation, the same symbols are given to the same components as those in the first embodiment and the corresponding descriptions are omitted.

[0106] Compared with the first embodiment, the structure of the non-return driving member 14 of this variation is different.

[0107] In this modified example, the stop driving member is a square column or cylindrical elastic body, which can be a rubber or rubber-plastic part. The stop driving member 14 is also arranged in the receiving groove 1212, one end of which abuts against the spring abutting surface 1212a, and the other end abuts against the bottom of the spring limiting groove 131 at one end of the stop pin 13.

[0108] When the stop pin 13 is subjected to a force radially toward the receiving groove 1121, the stop driving member causes the stop pin 13 to move toward the receiving groove 1121 through deformation and extrusion; when the stop pin 13 is no longer subjected to the above force, the stop driving member provides a force to push the stop pin 13 out through deformation and restoration.

[0109] In this variation, other structures are the same as those in the first embodiment, and thus will not be described again.

[0110] The above embodiments and variations are only used to illustrate the specific implementation methods of the utility model, and the utility model is not limited to the description scope of the above embodiments and variations. The technicians in this industry should understand that the utility model is not limited by the above embodiments and variations. The above embodiments and descriptions are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

[0111] For example, in the above embodiment, the rotating component in the nail gun is a cam and the energy storage component is a spring. In fact, the energy storage component can also be other elastic components that can store energy through compression, and the rotating component can also be other components that compress the energy storage component through rotation.

Claims

1. A reverse rotation limiting mechanism, used to make a component mounted on the reverse rotation limiting mechanism rotate in one direction, characterized in that: include: A rotating shaft, used to drive the components to rotate; The limiting disk has a clearance hole located in the middle thereof and a receiving groove communicated with the clearance hole, the rotating shaft member passes through the clearance hole, and the receiving groove extends in the radial direction of the rotating shaft member; A stop pin, disposed in the receiving groove and movable along the extending direction thereof; as well as a stop driving member, used for driving the stop pin to move toward the rotating shaft member, The outer periphery of the rotating shaft has a plurality of limiting teeth extending along its axial direction. The end of the stop pin facing the rotating shaft has: A stop mating surface, parallel to the radial direction of the rotating shaft, used to abut against the limiting tooth to prevent the rotating shaft from rotating in the reverse direction when the rotating shaft is subjected to a reverse driving force; as well as The rotating mating surface is inclined relative to the radial direction of the rotating shaft, and is used to abut against the limiting tooth when the rotating shaft is subjected to a positive driving force, pressing the stop pin toward the accommodating groove, so that the rotating shaft can rotate in the positive direction.

2. The reverse rotation limiting mechanism according to claim 1, characterized in that: in, The stop pin is columnar, and its side surface includes a cylindrical surface and a flat surface. The cross-sectional shape of the accommodating groove along its extending direction matches the axial cross-sectional shape of the stop pin.

3. The reverse rotation limiting mechanism according to claim 2, characterized in that: Also includes: Bearings, The limiting disk has a main body cover portion in the shape of a circular cover. The clearance hole is arranged in the middle of the top of the main body cover. The receiving groove is arranged in the top of the main body cover, and the notch thereof is located on the inner surface of the top of the main body cover. The rotating shaft member has a rotating shaft mounting disc portion in the shape of a disc and a rotating shaft column portion in the shape of a column, and the plurality of limiting teeth are arranged on the rotating shaft column portion. The bearing is sleeved on the shaft column, and the upper surface of the bearing contacts the inner surface of the top of the main body cover, and the lower surface of the bearing contacts the upper surface of the shaft mounting plate.

4. The reverse rotation limiting mechanism according to claim 3, characterized in that: in, The limiting plate also has a plurality of mounting blocks extending from the side of the main body cover, each of which is provided with a mounting hole. The upper edge of the main body cover has a plurality of arc-shaped notches, which are respectively located beside each of the mounting blocks.

5. The reverse rotation limiting mechanism according to claim 1, characterized in that: in, A limiting groove is formed between two adjacent limiting teeth. The limiting groove has a first side surface and a second side surface. The first side surface and the second side surface are both parallel to the axial direction of the rotating shaft. The first side surface is used to abut against the stop mating surface when the rotating shaft is subjected to the reverse driving force to prevent the reverse rotation. The second side surface is used to abut against the rotating mating surface when the rotating shaft is subjected to the positive driving force, so that the stop pin is subjected to the component force of the positive driving force along the radial direction toward the receiving groove, thereby pressing the stop pin toward the receiving groove.

6. The reverse rotation limiting mechanism according to claim 5, characterized in that: in, One end of some of the plurality of limiting teeth has a driving surface, The driving surface is a plane perpendicular to the radial direction of the rotating shaft, and the vertical distance from the driving surface to the central axis of the rotating shaft is smaller than the vertical distance from the outer end surface of the other limiting teeth to the central axis. The plurality of driving surfaces are distributed on both sides of the rotating shaft. The plurality of driving surfaces located on the same side are coplanar.

7. The reverse rotation limiting mechanism according to claim 5, characterized in that: in, The first side surface is parallel to the radial direction of the rotating shaft. The inclination angle of the second side surface relative to the corresponding first side surface is 30° to 45°, The inclination angle of the rotating matching surface relative to the radial direction of the rotating shaft is 30° to 80°.

8. The reverse rotation limiting mechanism according to claim 1, Features: Wherein, the stop pin comprises: A metal piece, which is in a columnar shape, has one end with a plane inclined relative to its axial direction, and one side surface of the metal piece is the stop mating surface; and The noise reduction layer is a modified plastic part, which is arranged on the plane of the metal part, and the outer surface of the noise reduction layer is the rotational matching surface.

9. The reverse rotation limiting mechanism according to claim 1, characterized in that: in, The stop driving member is an elastic member, which is arranged in the receiving groove, one end of which abuts against the groove bottom of the receiving groove, and the other end abuts against the stop pin. The elastic member is any one of a spring, a metal strip with one or more bending parts, a columnar rubber part, and a columnar rubber-plastic part.

10. A nail gun, characterized in that: include: Elastic components; A rotating component, used for compressing the elastic component to store energy by rotating; A rotation drive mechanism, used for driving the rotating component to rotate; and A reverse limiting mechanism is used to make the rotating component rotate in one direction. Wherein, the reverse limiting mechanism is the reverse limiting mechanism according to any one of claims 1 to 9.

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