stopper

Abstract

The application provides a position limiter for limiting a working head on a workpiece, which comprises a positioning device and a limiting device. The positioning device is used for fixing the position limiter on the workpiece, and the limiting device is used for limiting the movement of the working head relative to a surface to be machined. The limiting device comprises a limiting piece connected to the positioning device. The limiting piece comprises a first limiting end and a second limiting end. The first limiting end and the second limiting end respectively have a first limiting edge and a second limiting edge. The first limiting end and the second limiting end respectively have a free end capable of relative movement. The first limiting end and the second limiting end are relatively actuated to relatively limit the position range of the working head by the first limiting edge and the second limiting edge. The first limiting end and the second limiting end are relatively released to release the position range of the working head by the first limiting edge and the second limiting edge. The position limiter provided by the application has a free end, and the working head can be placed from multiple different directions, so that the position limiter can adapt to different working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to a position limiter, in particular to a position limiter for limiting the movement of a working head. BACKGROUND

[0002] When drilling a workpiece, it is often necessary to limit the working head to a certain position range to prevent the working head from moving too much on the workpiece and to ensure the progress of the working head drilling position. Especially when drilling holes on a workpiece with a smooth surface such as glass or ceramic tile, the working head is prone to slipping and manual positioning is difficult.

[0003] The position limiter is a commonly used tool for limiting the position range of the working head. The position limiter limits the lateral movement of the working head by a limiting edge, and the working head can make small lateral movements within this range and can be driven by a driving tool to rotate and longitudinally feed the drilling.

[0004] The common working head position limiter on the market includes a telescopic position limiter and a folding position limiter. The telescopic position limiter consists of two parts to form a diamond-shaped contour to limit the movement of the working head, and the length of the diamond is adjusted by translating the parts to fit different sizes of working heads. The two parts need to have a translation space to form a diamond-shaped contour, and such position limiter has a large volume and is not easy to carry; and the working head can only be placed in the vertical direction of the diamond-shaped contour, which may be limited in complex working conditions. The folding position limiter consists of four parts that can rotate relative to each other to form a diamond-shaped contour to limit the movement of the working head, and the angle of the diamond-shaped edge is adjusted to fit different sizes of working heads. Such position limiter needs four parts to form a diamond-shaped contour, and two fixers are needed to fix the two parts on the workpiece, which has a complex structure and is not easy to operate, and has a large volume; and the above limitations may also occur in complex working conditions. SUMMARY

[0005] In order to overcome the defects of the prior art, the present application provides a position limiter with simple structure, small volume and easy operation to overcome the defects of the prior art.

[0006] The technical scheme adopted by the present application to solve the problems of the prior art is:

[0007] The application discloses a position limiter for limiting a working head on a workpiece, which comprises a positioning device and a limiting device, the positioning device is used for fixing the position limiter on the workpiece, and the limiting device is used for limiting the movement of the working head relative to the workpiece surface, the limiting device comprises a limiting piece connected to the positioning device, the limiting piece comprises a first limiting end and a second limiting end, the first limiting end and the second limiting end are respectively provided with a first limiting edge and a second limiting edge, the first limiting end and the second limiting end are respectively provided with a free end capable of relative movement, the first limiting end and the second limiting end are relatively actuated so that the first limiting edge and the second limiting edge limit the position range of the working head, and the first limiting end and the second limiting end are deviated from the actuation so that the first limiting edge and the second limiting edge release the position range of the working head.

[0008] Compared with the prior art, the position limiter provided by the application has a free end, the working head can be placed from multiple different directions, and thus the position limiter can adapt to different working conditions.

[0009] In one of the embodiments, the limiting piece comprises a first limiting piece and a second limiting piece, the first limiting piece and the second limiting piece form the first limiting end and the second limiting end respectively, and the first limiting end and the second limiting end form the first limiting edge and the second limiting edge respectively.

[0010] In one of the embodiments, the position limiter further comprises a fixing device for controlling the angle degree of the first limiting piece and the second limiting piece, and thus the angle degree of the first limiting edge and the second limiting edge is fixed.

[0011] In one of the embodiments, the angle limiting mechanism comprises an arc-shaped slot arranged on the first limiting piece and a limiting pin arranged on the second limiting piece and embedded in the arc-shaped slot, the limiting pin abuts against the edge of the arc-shaped slot, and the angle variation range of the first limiting piece and the second limiting piece is limited.

[0012] In one of the embodiments, the limiting device further comprises an angle grading mechanism arranged between the first limiting piece and the second limiting piece, the angle grading mechanism constitutes the fixing device and is used for fixing the first limiting piece and the second limiting piece at a specific angle.

[0013] In one of the embodiments, the angle grading mechanism comprises at least two positioning holes arranged in the circumferential direction on the first limiting piece and a positioning pin arranged on the second limiting piece and capable of being matched with the positioning holes.

[0014] In one of the embodiments, the limiting device further comprises a reset mechanism arranged between the first limiting piece and the second limiting piece, when the angle of the first limiting piece and the second limiting piece is adjusted, the reset mechanism makes the first limiting piece and the second limiting piece keep close in the axial direction.

[0015] In one of the embodiments, the first limiting member is fixedly arranged on the positioning device, and the second limiting member is movable relative to the first limiting member.

[0016] In one of the embodiments, the first limiting member has a first arc-shaped profile, and the second limiting member has a second arc-shaped profile arranged opposite to the first arc-shaped profile, and the first arc-shaped profile and the second arc-shaped profile jointly define the working head.

[0017] In one of the embodiments, the positioning device comprises a suction cup in contact with the workpiece, a pull rod connected at one end to the center of the suction cup, a bowl body sleeved on the pull rod and axially abutting against the edge of the suction cup, elastic members sleeved on the pull rod and axially abutting against the suction cup and the bowl body respectively, and a handle eccentrically arranged with the pull rod; the first limiting member and the second limiting member are both sleeved on the pull rod and located between the handle and the bowl body, and rotate relative to the pull rod to generate an angle change; when the handle is eccentrically rotated, the handle can pull the pull rod to generate a negative pressure at the center of the suction cup, so that the limiting member is fixed on the workpiece, and the handle and the bowl body constitute the fixing device to clamp the first limiting member and the second limiting member. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above-mentioned purposes, technical solutions and beneficial effects of the invention can be realized through the following drawings.

[0019] Figure 1 is a schematic view of the limiting member in an unfixed state.

[0020] Figure 2 is a schematic view of the limiting member in a small-angle fixed state.

[0021] Figure 3 is a schematic view of the limiting member in a large-angle fixed state.

[0022] Figure 4 is an exploded view of the limiting member. DETAILED DESCRIPTION

[0023] As Figure 1The present application relates to a stopper 10 for limiting the movement of a working head when the working head is working on a workpiece. The working head here is a hole saw, but can also be other working heads with a cylindrical body. The stopper 10 limits the position range of the working head, preventing the working head from moving and slipping on the workpiece surface when working, especially on a workpiece surface with a smooth machined surface. The stopper 10 related to the present application comprises a positioning device for fixing the stopper 10 on the workpiece to be machined and a limiting device for limiting the position range of the working head on the machined surface of the workpiece. The limiting device comprises a limiting piece 200 connected to the positioning device, the limiting piece 200 having a first limiting edge 212 and a second limiting edge 222, the first limiting edge 212 and the second limiting edge 222 defining a limiting edge of the working head. The limiting edge is approximately "V" shaped or U shaped. When working, the working head is located within the limiting edge formed by the first limiting edge 212 and the second limiting edge 222, and the limiting edge defines a position range within which the working head can move. The distance of movement is relatively small, so as to ensure the accuracy of the hole position of the working head. The limiting edge does not affect the rotation and longitudinal feed of the working head, and when the hole is drilled to a certain depth, the position of the hole is determined, and the stopper can be removed.

[0024] Specifically, the limiting piece 200 comprises a first limiting end 211 and a second limiting end 221, the first limiting edge 212 is formed on the side of the first limiting end 211 close to the second limiting end 221, and the second limiting edge 222 is formed on the side of the second limiting end 221 close to the first limiting end 211. When the first limiting end 211 and the second limiting end 221 act relatively, the first limiting edge 212 and the second limiting edge 222 relatively define the position range of the working head; when the first limiting end 211 and the second limiting end 221 act away, the first limiting edge 212 and the second limiting edge 222 release the position range of the working head. Here, the action can be understood as the relative movement of the two limiting ends, which can be displacement, rotation, etc., and the action can be operated by a person, driven by a machine or automatically controlled, etc. The position range is determined by the size of the working head, so that the relative action of the first limiting end 211 and the second limiting end 221 makes the stopper 10 suitable for working heads of different sizes.

[0025] When the limiting piece 200 limits the working head, the first limiting end 211 and the second limiting end 221 are pressed relatively to press the first limiting edge 212 and the second limiting edge 222 relatively to determine the position range of the working head. The action of pressing the first limiting end 211 and the second limiting end 221 relatively comes from external pressure applied to the first limiting end 211 and the second limiting end 221.

[0026] The first limiting edge 212 and the second limiting edge 222 can be directly formed on the opposite sides of the first opposite end and the second opposite end, or can be located on a part of structure of the first opposite end and the second opposite end, which is not limited to be an integral structure with the first limiting end 211 and the second limiting end 221, but also can be an additional part which is separate but relatively fixed. For example, a rotatable and movable part is arranged inside the first limiting end 211 and the second limiting end 221, and the first limiting edge 212 and the second limiting edge 222 are respectively formed on the edges of the part which can limit the position range.

[0027] The first limiting end 211 and the second limiting end 221 respectively have a free end 260 which can relatively move, which can be two relatively movable free ends 260 of an integral limiting part 200, or can be free ends 260 of two relatively movable parts of a separate limiting part 200, and is not limited to have an absolute connecting part or be fixed at the same position. The free end 260 can be understood as that the first limiting end 211 and the second limiting end 221 respectively have a free end, so that the working head can enter between the first limiting end 211 and the second limiting end 221 in a free manner. In the embodiment, the limiting edge of the first limiting end 211 and the second limiting end 221 is open, as shown in FIGS. Figure 1 、 2 , 3, the working head can enter the opening from the middle of the opening and then adhere to the other side of the limiting edge, or can enter the opening along one side of the limiting edge and then adhere to the other side of the limiting edge, or can enter the opening from the vertical direction of the limiting edge and then adhere to the limiting edge. The working head adheres to the limiting edge in a more free manner, so that the limiter 10 can be suitable for various working conditions, such as narrow space or space with many obstacles. The relatively movable is to adjust the size of the free end 260, so as to adapt to working heads of different sizes. In the embodiment, the first limiting end 211 and the second limiting end 221 adjust the size of the opening of the free end 260.

[0028] In a preferred embodiment, the limiting part 200 includes a first limiting part 210 and a second limiting part 220, the first limiting end 211 is formed on the first limiting part 210, the first limiting end 211 forms the first limiting edge 212, the second limiting end 221 is formed on the second limiting part 220, and the second limiting end 221 forms the second limiting edge 222. The first limiting end 211 and the second limiting end 221 can relatively move, which can be that the first limiting end 211 and the second limiting end 221 are respectively movable parts of the first limiting part 210 and the second limiting part 220, or the first limiting part 210 and the second limiting part 220 can relatively move, so as to drive the first limiting end 211 and the second limiting end 221 to relatively move. At the same time, the first limiting end 211 and the second limiting end 221 are the free end 260.

[0029] In the embodiment, as shown in Figure 1 、 2 , the first limiting member 210 and the second limiting member 220 can change the angle with each other, and can be rotating towards each other or rotating away from each other, or one of them rotates. As shown in Figure 2 and Figure 3 , the included angle between the first limiting member 210 and the second limiting member 220 is different, so that the opening size formed by the first limiting member 210 and the second limiting member 220 is different, and the size of the work head that can be limited is also different. Therefore, the angle between the first limiting member 210 and the second limiting member 220 can be changed, so that the limiting device 10 can adapt to work heads of different sizes. Figure 2 In the embodiment, the included angle between the first limiting member 210 and the second limiting member 220 is small, Figure 3 In the embodiment, the included angle between the first limiting member 210 and the second limiting member 220 is large.

[0030] In order to better stabilize the clamping of the work head, the first limiting edge 212 and the second limiting edge 222 provide an arc-shaped profile that fits the outer profile of the clamped part of the work head, as shown in Figure 1 、 2 , 3, the arc-shaped profiles are oppositely arranged, that is, the concave arc-shaped profiles are oppositely arranged, and the work head is placed between the concave arc-shaped profiles, and the two arc-shaped profiles jointly define the work head. Compared with the straight edge profile, the arc-shaped profile is more suitable for the outer profile of the work head and can be defined in the radial direction. Moreover, when the arc-shaped profile contacts the work head, the contact area is large, the limiting is more stable, the wear is small, and the service life of the limiting device 10 is improved.

[0031] In order to prevent the work head from pushing the first limiting member 210 and the second limiting member 220 to change the angle when contacting them, the limiting device 10 further comprises a fixing device for controlling the adjustment or controlling the fixing of the included angle of the first limiting member 210 and the second limiting member 220, for fixing the included angle of the two.

[0032] The limiting device 10 realizes the function of limiting the work head on the workpiece through one positioning device and two limiting members connected to the positioning device. When facing work heads of different sizes, the user only needs to adjust the angle relationship of the two limiting members, which is simple in structure, small in size, and easy to operate.

[0033] As shown in Figure 4In order to limit the range of the angle change between the first limiting member 210 and the second limiting member 220, the limiting device further comprises an angle limiting mechanism 230 arranged between the first limiting member 210 and the second limiting member 220. In the embodiment, the angle limiting mechanism 230 comprises an arc-shaped slot 231 arranged on the first limiting member 210 and a limiting pin 232 arranged on the second limiting member 220, the limiting pin 232 is embedded in the arc-shaped slot 231. When the first limiting member 210 and the second limiting member 220 rotate relative to each other, the limiting pin 232 moves in the arc-shaped slot 231; when the limiting pin 232 abuts against the edge of the arc-shaped slot 231, the first limiting member 210 and the second limiting member 220 cannot continue to rotate, and thus the limiting pin 232 and the edges at both ends of the arc-shaped slot 231 limit the maximum and minimum values of the angle between the first limiting member 210 and the second limiting member 220, thereby limiting the maximum and minimum sizes of the work head that the limiting device 10 can limit.

[0034] The limiting pin 232 can be integrally formed with the second limiting member 220 or can be mounted on the second limiting member 220. In other embodiments, the positions of the arc-shaped slot 231 and the limiting pin 232 can be reversed, or other components capable of limiting the extreme positions of the angle can be used.

[0035] In order to enable the first limiting member 210 and the second limiting member 220 to form a plurality of specific angles, i.e., the first limiting member 210 and the second limiting member 220 can form a plurality of specific opening sizes, the limiting device further comprises an angle grading mechanism 240 arranged between the two. As Figure 4 In the embodiment, the angle grading mechanism 240 comprises at least two positioning holes 241 arranged on the first limiting member 210 in the circumferential direction of rotation and a positioning pin 242 arranged on the second limiting member 220, the positioning pin 242 can be inserted into each positioning hole 241, so that the first limiting member 210 and the second limiting member 220 cannot rotate relative to each other, thereby fixing the angle between them. In use, the user can lift the second limiting member 220 to disengage the positioning pin 242 from the positioning hole 241, thereby adjusting the angle; when the angle is not adjusted to a specific angle, the positioning pin 242 is not aligned with the positioning hole 241 and cannot be inserted, and thus the angle cannot be fixed; when the angle is adjusted to a specific angle, the positioning pin 242 is aligned with and inserted into the positioning hole 241, and thus the angle is fixed. Therefore, the angle grading mechanism 240 also constitutes the fixing device described above.

[0036] The positioning pin 242 can be integrally formed on the second limiting member 220 or can be mounted on the second limiting member 220. In other feasible embodiments, the positions of the positioning hole 241 and the positioning pin 242 can be reversed.

[0037] As Figure 4The limiting device further comprises a reset mechanism 250 arranged between the first limiting member 210 and the second limiting member 220. When the user picks up the first limiting member 210 and the second limiting member 220 to adjust the angle, the reset mechanism 250 can make the two members keep close in the axial direction after the adjustment is completed. The reset mechanism 250 comprises a magnet 255 arranged between the first limiting member 210 and the second limiting member 220, and the first limiting member 210 and the second limiting member 220 are both made of iron. The magnet 255 can be arranged in a hole 251 of the first limiting member 210. The adsorption of the magnet 255 can also make the user feel a clear adjustment to the position and the reset feeling.

[0038] When adjusting the angle, only one of the first limiting member 210 and the second limiting member 220 needs to be movable, and the other needs to be fixed, which facilitates one-handed operation. Therefore, the first limiting member 210 is fixed on the positioning device, and the second limiting member 220 can adjust the mutual angle relative to the first limiting member 210.

[0039] As Figure 4 described above, the positioning device comprises a suction cup 110 in contact with the workpiece, a pull rod 120 connected at one end to the center of the suction cup, a bowl body 130 sleeved on the pull rod 120 and axially abutting against the edge of the suction cup 100, an elastic member 140 sleeved on the pull rod 120 and axially abutting against the suction cup 110 and the bowl body 130 respectively, and a handle 150 eccentrically arranged at the other end of the pull rod through a pin 160. The first limiting member 210 and the second limiting member 220 are sleeved on the pull rod 120 and located between the handle 150 and the bowl body 130. In this embodiment, the rotation of the first limiting member 210 and the second limiting member 220 is a rotation around the pull rod 120, and the axial direction is the axial direction of the pull rod 120. In this embodiment, in order to fix the first limiting member 210, the first limiting member 210 is connected with the bowl body 130 through a screw 131.

[0040] When the user operates the handle 150 to rotate eccentrically, as shown in Figure 2 and Figure 3 , the handle 150 abuts against the second limiting member 200 and pulls the pull rod 120, the pull rod 120 pulls up the center of the suction cup 110, and the bowl body 150 is abutted and makes the edge of the suction cup 110 unable to move away from the workpiece, so that the negative pressure is generated between the center of the suction cup and the workpiece, thereby fixing the positioner 10 on the workpiece. Since the first limiting member 210 and the second limiting member are located between the handle 150 and the bowl body 130, the two members are clamped and cannot rotate relative to each other, and therefore the handle 150 and the bowl body 130 constitute the fixing device. At this time, the elastic member 140 abutting against the suction cup 110 and the bowl body 130 is in a compressed state.

[0041] When the user operates the handle 150 to rotate reversely eccentrically, as shown in Figure 1As shown, the handle 150 releases the pull rod 120, the elastic member 140 pushes the suction cup 110 to restore contact with the workpiece, the pressure between the center of the suction cup and the workpiece is restored to normal, at this time the stopper 10 can be moved on the workpiece or taken away, the first limiting member 210 and the second limiting member are not clamped, and can be relatively rotated.

[0042] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the present application.

[0043] The above-mentioned embodiments only express the implementation of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A position limiter (10) for positioning a working head on a workpiece to be machined, said position limiter (10) comprising positioning means for fixing said position limiter (10) on the workpiece to be machined and limiting means for limiting the movement of the working head relative to the surface to be machined; characterized in that, The limiting device comprises a limiting member (200) connected to the positioning device, the limiting member (200) comprises a first limiting end (211) and a second limiting end (221), the first limiting end (211) and the second limiting end (221) respectively have a first limiting edge (212) and a second limiting edge (222), the first limiting end (211) and the second limiting end (221) respectively have a free end (260) capable of relative movement, the first limiting end (211) and the second limiting end (221) relatively act to limit the position range of the working head by the first limiting edge (212) and the second limiting edge (222), the first limiting end (211) and the second limiting end (221) are away from the act to release the position range of the working head by the first limiting edge (212) and the second limiting edge (222), the limiting member (200) comprises a first limiting member (210) and a second limiting member (220), the limiting device further comprises a reset mechanism (250) arranged between the first limiting member (210) and the second limiting member (220), when the angle of the first limiting member (210) and the second limiting member (220) is adjusted, the reset mechanism (250) makes the first limiting member (210) and the second limiting member (220) keep close in the axial direction, the reset mechanism (250) comprises a magnet (255) arranged between the first limiting member (210) and the second limiting member (220), the first limiting member and the second limiting member are both ferrous.

2. The limiter (10) according to claim 1, characterized in that The first limiting member (210) and the second limiting member (220) respectively form the first limiting end (211) and the second limiting end (221), the first limiting end (211) and the second limiting end (221) respectively form the first limiting edge (212) and the second limiting edge (222).

3. The limiter (10) according to claim 2, characterized in that The limiting device further comprises a fixing device for controlling the adjustment or controlling the fixing of the included angle of the first limiting member (210) and the second limiting member (220), thereby fixing the included angle of the first limiting edge (212) and the second limiting edge (222).

4. The limiter (10) according to claim 3, characterized in that The limiting device further comprises an angle limiting mechanism (230) arranged between the first limiting member (210) and the second limiting member (220) for limiting the angle change range of the first limiting member (210) and the second limiting member (220).

5. The limiter (10) according to claim 4, characterized in that The angle limiting mechanism (230) comprises an arc-shaped slot (231) arranged on the first limiting member (210) and a limiting pin (232) arranged on the second limiting member (220) and embedded in the arc-shaped slot (231), the limiting pin (232) abuts against the edge of the arc-shaped slot (231), thereby limiting the angle change range of the first limiting member (210) and the second limiting member (220).

6. The limiter (10) according to claim 3, characterized in that The limiting device further comprises an angle demarcation mechanism (240) arranged between the first limiting member (210) and the second limiting member (220), the angle demarcation mechanism (240) constituting the fixing device for fixing the first limiting member (210) and the second limiting member (220) at a specific angle.

7. The limiter (10) according to claim 6, characterized in that The angle demarcation mechanism (240) comprises at least two positioning holes (241) arranged circumferentially on the first limiting member (210) and a positioning pin (242) arranged on the second limiting member (220) and capable of being matched with the positioning holes (241).

8. The limiter (10) according to claim 1, characterized in that The first limiting edge (212) has a first arc-shaped profile, the second limiting edge (222) has a second arc-shaped profile arranged opposite to the first arc-shaped profile, and the first arc-shaped profile and the second arc-shaped profile jointly define a working head.

9. The limiter (10) according to claim 3, characterized in that The positioning device comprises a suction disc (110) in contact with a workpiece, a pull rod (120) connected at one end to the center of the suction disc (110), a bowl body (130) sleeved on the pull rod (120) and axially abutting against the edge of the suction disc (110), an elastic member (140) sleeved on the pull rod (120) and axially abutting against the suction disc (110) and the bowl body (130) respectively, and a handle (150) arranged eccentrically with the pull rod (120); The first limiting member (210) and the second limiting member (220) are both sleeved on the pull rod (120) and located between the handle (150) and the bowl body (130), the first limiting member is fixed on the bowl body (130), and the second limiting member rotates relative to the pull rod (120) to generate an angle change; When the handle (150) rotates eccentrically, the handle (150) can pull the pull rod (120) to generate a negative pressure at the center of the suction disc (110), so that the limiting device (10) is fixed on the workpiece, and the handle (150) and the bowl body (130) constitute the fixing device for clamping the first limiting member (210) and the second limiting member (220).

Images