CN113319366A

CN113319366A - Chuck component and jig saw

Info

Publication number: CN113319366A
Application number: CN202110724096.6A
Authority: CN
Inventors: 赵殿虎; 林玲
Original assignee: Zhejiang Crown Electric Tools Manufacture Co ltd
Current assignee: Zhejiang Crown Electric Tools Manufacture Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-08-31
Anticipated expiration: 2041-06-29
Also published as: CN113319366B

Abstract

The application provides a chuck subassembly, including fixing base, sliding seat, compression spring, torsion spring and lock cover. The movable seat is movably connected with the fixed seat and forms an accommodating space, at least one clamping groove with an inclined surface is arranged at one end, close to the opening of the accommodating space, of the movable seat, and the number of the clamping grooves is two, and one clamping groove corresponds to one side of one positioning shoulder. One end of the pressure spring is fixedly connected with the tool body, and the other end of the pressure spring is in contact connection with one end of the movable seat. The torsion spring is sleeved on the fixed seat and the movable seat in the circumferential direction. The lock sleeve is sleeved on the torsion spring and is provided with a through hole for the positioning shoulder to pass through; and, still be equipped with two cam surfaces on the lock sleeve inner wall, the cam surface is used for the butt positioning shoulder. By adopting the structure, when the saw blade is clamped, the pressing of the saw blade in the axial direction and the side direction can be simultaneously ensured, the structure is simple and compact, and the cutting precision of the whole machine is improved.

Description

Chuck component and jig saw

Technical Field

The invention relates to the technical field of electric tools, in particular to a chuck assembly and a jig saw.

Background

The saw blade of the cutting tool is a consumable item requiring free removal from its reciprocating bar for ready replacement. Accordingly, various types of blade clamping devices have been designed to address this problem. The saw blade clamping device of the existing cutting tool needs different components to limit the freedom degrees of the saw blade in different directions, and the structure is complex.

Disclosure of Invention

The invention aims to provide a chuck component to solve the technical problem that the existing chuck component is complex in structure.

To achieve the above object, the present application provides a chuck assembly for holding a saw blade having a tooth portion and a locating shoulder portion and connected to a tool body, comprising:

the fixed seat is connected with the tool body;

the movable seat is movably connected with the fixed seat and forms an accommodating space, one end, close to an opening of the accommodating space, of the movable seat is provided with two clamping grooves, at least one surface of each clamping groove is an inclined surface, and one clamping groove corresponds to one side of one positioning shoulder;

one end of the pressure spring is fixedly connected with the tool body, and the other end of the pressure spring is in contact connection with one end of the movable seat;

the torsion spring is sleeved on the fixed seat and the movable seat in the circumferential direction; and the number of the first and second groups,

the lock sleeve is sleeved on the torsion spring and is provided with a through hole for the positioning shoulder to pass through; and, still be equipped with two cam surfaces on the lock sleeve inner wall, the cam surface is used for the butt location shoulder.

Optionally, in the chuck assembly, the clamping groove has a vertical side, a horizontal side and a bevel side which are connected in sequence; wherein the length of the horizontal side is less than the thickness of the positioning shoulder; the included angle between the oblique edge and the vertical edge is 30-45 degrees.

Optionally, in the chuck assembly, the clamping groove is a "V" shaped groove, and the included angle of the "V" shaped groove is 30-45 °.

Alternatively, in the cartridge assembly, the cam surfaces are located at the through-hole opening inner wall, and both the cam surfaces are symmetrical about the center of the opening of the through-hole.

Optionally, in the chuck assembly, at least one first positioning portion is provided on the movable seat and at the same end as the clamping groove; the inner wall of the lock sleeve is at least provided with a second positioning part matched with the first positioning part, and the second positioning part and the opening of the through hole are positioned on the same plane.

Optionally, in the chuck assembly, the first positioning portion is a protrusion, and the second positioning portion is a groove or a limiting hole.

Optionally, in the cartridge assembly, the boss projection height is not less than 0.5 mm.

Optionally, in the cartridge assembly, each of the cam surfaces includes a high position and a low position, the high position pressing against the saw blade when the high position abuts the locating shoulder; when said is low

Optionally, in the cartridge assembly, the cam surface has an arc angle of 60 ° to 150 °.

Optionally, in the chuck assembly, the bottom of the fixed seat is a disc-shaped seat, and a mounting hole is formed in the middle of the fixed seat, and the movable seat passes through the mounting hole; and the disc-shaped base deviates from the end face of the tool body and is provided with a limiting space.

Optionally, in the chuck assembly, the circular arc angle of the limiting space is 75-100 °.

In another aspect, the application further provides a curve saw comprising the chuck assembly.

Compared with the prior art, the cartridge assembly that this application provided, through be close to on the sliding seat accommodation space open-ended serves and has at least one side for the inclined plane's centre gripping groove, the centre gripping groove is two, be equipped with two cam surfaces on the lock sleeve inner wall, the cam surface is used for the butt location shoulder. When the saw blade is clamped, the pressing of the saw blade in the axial direction and the side direction can be simultaneously ensured, the structure is simple and compact, and the cutting precision of the whole machine is improved.

Drawings

FIG. 1 is an exploded view of a chuck assembly provided by an embodiment of the present application;

FIG. 2 is an assembled view of a chuck assembly provided in accordance with an embodiment of the present application;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a schematic structural diagram of a lock sleeve provided in an embodiment of the present application;

FIG. 5 is an assembly view of a movable seat and a fixed seat provided in the embodiments of the present application;

FIG. 6 is a schematic structural diagram of another lock sleeve provided in the embodiments of the present application;

FIG. 7 is a schematic structural diagram of another lock sleeve provided in the embodiments of the present application;

FIG. 8 is a schematic structural diagram of another lock sleeve provided in an embodiment of the present application;

fig. 9 is a schematic structural diagram of a curve saw according to an embodiment of the present application.

Wherein the reference numerals of figures 1 to 9 are as follows:

10-a chuck assembly; 11-a fixed seat; 112-disc shaped base; 113-a limit boundary; 114-a chute; 12-a movable seat; 121-a clamping groove; 122-a first positioning portion; 111. 123-arc-shaped bulge; 124-a mounting portion; 125-a guide rail; 13-a pressure spring; 14-a torsion spring; 15-a lock sleeve; 151-through holes; 152-a cam surface; 153-a second location portion; 154-a third locator portion; 155-deflector rod; 156-vertical cleats; 157- "X" shaped anti-skid strip; 20-saw blade 20; 21-a serration; 22-positioning the shoulder; 30-tool body.

Detailed Description

To make the objects, advantages and features of the present invention more apparent, the chuck assembly and the jig saw according to the present invention will be described in further detail with reference to fig. 1 to 9. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Referring to fig. 1-4, in conjunction with fig. 9, a chuck assembly 10, the chuck assembly 10 is used for holding a saw blade 20 and is connected with a tool body 30, the saw blade 20 has a saw tooth portion 21 and a positioning shoulder portion 22, and the chuck assembly 10 includes a fixed seat 11, a movable seat 12, a pressure spring 13, a torsion spring 14 and a lock sleeve 15. The fixing seat 11 is connected with the tool body 30. The tool body 30 is a tool body 30 of a jig saw, and specifically is a reciprocating rod of the jig saw, that is, the fixing seat 11 is connected with the reciprocating rod of the jig saw. The movable seat 12 and the fixed seat 11 are movably connected to form an accommodating space, at least one clamping groove 121 with an inclined surface is formed in one end, close to the opening of the accommodating space, of the movable seat 12, the clamping groove 121 is provided with two clamping grooves 121, and one clamping groove 121 corresponds to one side of the positioning shoulder 22. One end of the pressure spring 13 is fixedly connected with the tool body 30, and the other end of the pressure spring 13 is in contact connection with one end of the movable seat 12. The torsion spring 14 is sleeved on the fixed seat 11 and the movable seat 12 in the circumferential direction. The lock sleeve 15 is sleeved on the torsion spring 14, and a through hole 151 for the positioning shoulder 22 to pass through is formed in the lock sleeve 15; two cam surfaces 152 are further provided on the inner wall of the lock sleeve 15, and the cam surfaces 152 are used for abutting against the positioning shoulder 22.

Wherein the saw blade 20 has a clamped state and a released state; the cartridge assembly 10 is configured to: when the saw blade 20 is released, the lock sleeve 15 rotates to cause the two cam surfaces 152 to release both sides of the positioning shoulder 22 of the saw blade 20, the pressure spring 13 releases the preload to drive the clamping lever to move in a direction away from the tool body 30, the clamping lever ejects the saw blade 20, when the saw blade 20 is pressed, the positioning shoulder 22 of the saw blade 20 is located in the clamping groove 121, the lock sleeve 15 rotates, one cam surface 152 presses one side of the positioning shoulder 22 of the saw blade 20 into the clamping groove 121, and the other cam surface 152 synchronously presses the other side of the positioning shoulder 22 of the saw blade 20 into the clamping groove 121 to clamp the saw blade 20.

The movable seat 12 is provided with two clamping grooves 121 with at least one inclined surface at one end close to the opening of the accommodating space, the inner wall of the lock sleeve 15 is provided with two cam surfaces 152, and the cam surfaces 152 are used for abutting against the positioning shoulders 22. When the saw blade 20 is clamped, the pressing of the saw blade 20 in the axial direction and the side direction can be simultaneously ensured, the structure is simple and compact, and the cutting precision of the whole machine is improved.

Specifically, the clamping groove 121 has a vertical side, a horizontal side and a bevel side which are connected in sequence; wherein the length of the horizontal side is less than the thickness of the positioning shoulder 22. Because the length of the horizontal edge is less than the thickness of the positioning shoulder 22, the positioning shoulder 22 will not contact with the horizontal edge during the whole locking process, when the positioning shoulder 22 starts to contact with the bevel edge and the vertical edge, the bevel edge will approach the vertical edge under the action of pressure when the cam approaches the horizontal edge due to the pressure of the cam, and when the bevel cannot approach the vertical edge any more, the cam surface 152 presses the saw blade 20. More preferably, the angle between the bevel edge and the vertical edge is 30 ° to 45 °, for example 30 °, 35 °, 40 ° and 45 °.

In one embodiment, the gripping groove 121 is a "V" shaped groove having an included angle of 30-45, such as 30, 35, 40, and 45.

Preferably, the cam surfaces 152 are located at the inner walls of the openings of the through holes 151, and the two cam surfaces 152 are symmetrical about the center of the openings of the through holes 151. At least one first positioning portion 122 is provided on the movable seat 12 at the same end as the holding groove 121; at least one second positioning portion 153 is disposed on the inner wall of the lock sleeve 15, and the second positioning portion 153 and the opening of the through hole 151 are located on the same plane.

Specifically, the first positioning portion 122 is a protrusion, and the second positioning portion 153 is a groove or a limiting hole. The first positioning portion is a protrusion, and the second positioning portion 153 is a groove or a limiting hole. When the second positioning portion 153 is a limiting hole, the limiting hole may be formed along the edge of the through hole 151 toward the edge of the lock sleeve 15, or may not be communicated with the through hole 151.

The height of the protrusion of the protruding portion is not less than 0.5mm, and if the second positioning portion 153 is a groove, the depth of the groove is not less than 0.5 mm. Therefore, the size of the matching limit is not less than 0.5 mm. The inventor researches and finds that the size of the fit limit is not less than 0.5mm, so that the driving force of the torsion spring 14 to the circumferential direction of the lock sleeve 15 can be overcome, and the circumferential limit of the lock sleeve 15 is more stable and firm.

In one embodiment, each cam surface 152 includes a high position and a low position, wherein the high position presses against the saw blade 20 when the high position abuts the retaining shoulder 22; when the low position is near the retaining shoulder 22, the saw blade 20 is released from the retaining groove 121. Specifically, the saw blade 20 is in the locking position as the initial position, and one of the high positions presses the saw blade 20 corresponding to one side of the positioning shoulder 22 pressing the saw blade 20. Rotating the lock sleeve 15, the high position is away from the locating shoulder 22 of the saw blade 20, and the saw blade 20 is in the release position. Further, when the saw blade 20 is completely separated from the chuck assembly 10, the first position-limiting part and the second position-limiting part 153 are engaged with each other, so that the opening position of the through hole 151 and the opening of the receiving space are aligned and locked after the saw blade 20 is released, so as to facilitate the installation of the saw blade 20 again.

Specifically, for convenience of operation, the outer peripheral surface of the lock sleeve 15 is provided with a shift lever 155 arranged outwards, or is provided with an anti-slip portion, so that when the saw blade 20 is detached, friction force can be increased, and operation is more labor-saving. As shown in fig. 7, the anti-slip portion may be a circle of vertical anti-slip strips 156 evenly spaced along the circumference of the lock sleeve 15. As shown in fig. 8, the anti-slip portion may be a circle of "X" shaped anti-slip strips 157 arranged at regular intervals along the circumference of the lock sleeve 16.

Wherein the arc angle of the cam surface 152 is 60 ° to 150 °, such as 60 °, 75 °, 90 °, 105 °, 120 °, 135 °, and 150 °. The inventor researches and finds that when the arc angle of the cam surface 152 is 60-150 °, the problem that the saw blade 20 is easy to slip when being pressed because the arc angle is too small, and the problem that the lock sleeve 15 needs to be rotated excessively when the saw blade 20 is dismounted because the arc angle is too large can not occur.

In another embodiment, the bottom of the fixed base 11 is a disc-shaped base 112, and a mounting hole is formed in the middle of the fixed base, and an end of the movable base 12 away from the first positioning portion 122 passes through the mounting hole. And a limit space is arranged on the end surface of the disc-shaped base 112, which is far away from the tool body 30. Preferably, the arc angle of the limiting space is 75-100 degrees, such as 75 degrees, 85 degrees, 90 degrees, 95 degrees and 100 degrees. Specifically, a third positioning portion 154 extending in the axial direction of the lock sleeve 15 is disposed in the middle of one end surface of the cam surface 152, two limiting boundaries 113 are disposed in the limiting space in the axial direction of the lock sleeve 15, and the third positioning portion 154 moves in the limiting space in the process of mounting and dismounting the saw blade 20. When the saw blade 20 is removed or mounted by setting the arc angle of the stopper space, the third positioning portion 154 moves to the limit position when it moves to the stopper space boundary 113, so that the removal or mounting position of the saw blade 20 can be intuitively known.

In another embodiment, the fixed seat 11 and the movable seat 12 are movably connected. Specifically, the fixed seat 11 is provided with a sliding groove 114 along the direction of the long side thereof, and the movable seat 12 is provided with a guide rail 125 along the direction of the long side thereof; the guide rail 125 is disposed within the chute 114. Therefore, the movable seat 12 can reciprocate along the installation direction of the saw blade 20, the movable seat 12 is movably connected with the fixed seat 11 by adopting the structures of the guide rail 125 and the sliding groove 114, so that the stress of the whole mechanism is more reasonable, and the service life is prolonged.

In another embodiment, since the motion driving force of the movable seat 12 is derived from the pressure spring 13, the movable seat 12 and the fixed seat 11 can also be in surface contact connection while ensuring the stability of the pressure spring 13 along the moving track in the direction of assembling the saw blade 20. This reduces the friction between the fixed seat 11 and the movable seat 12, thereby increasing the service life thereof.

Since the end of the movable seat 12 away from the first positioning portion 122 passes through the mounting hole, it is known that the mounting hole limits the degree of freedom of the movable seat 12 in the radial direction of the lock sleeve 15, and therefore, even if the stability of the movement locus of the pressure spring 13 in the direction of assembling the saw blade 20 cannot be ensured, the movable seat 12 and the movable seat 12 can be connected in a surface contact manner, and the stability of the reciprocating movement of the movable seat 12 can also be ensured.

Specifically, the movable seat 12 penetrates through one end of the mounting hole to be connected with the pressure spring 13, the diameter of the end is reduced to form a mounting portion 124, and the mounting portion 124 is pressed into the inner diameter of the pressure spring 13 to be tightly connected with the pressure spring 13.

More preferably, the ends of the movable seat 12 and the fixed seat 11, which are away from the tool body 30, are both provided with an arc-shaped

protrusion

111, 123, the circle centers of the two arc-shaped

protrusions

111, 123, the circle center of the fixed seat 11, and the circle center of the movable seat 12 are located on the same axis, and the radius of the arc-shaped

protrusion

111, 123 located on the movable seat 12 is smaller than the radius of the movable seat 12; the radius of the arc-shaped

protrusions

111 and 123 on the fixed seat 11 is smaller than that of the fixed seat 11; the side walls of the

arcuate projections

111 and 123 are engaged with the side walls of the through-hole 151. The two circular arc-shaped

protrusions

111 and 123 limit the lock sleeve 15 in the radial direction thereof, but do not limit the reciprocating movement of the movable base 12 in the mounting direction of the saw blade 20.

Referring to fig. 9, in another aspect, the present application further provides a jigsaw including the chuck assembly 10 described above.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims

1. A chuck assembly for holding a saw blade having a tooth portion and a locating shoulder portion and connected to a tool body, comprising:

the fixed seat is connected with the tool body;

2. The chuck assembly of claim 1, wherein the holding groove has a vertical side, a horizontal side and a bevel side connected in series; wherein the length of the horizontal side is less than the thickness of the positioning shoulder; the included angle between the oblique edge and the vertical edge is 30-45 degrees.

3. The chuck assembly of claim 1, wherein the gripping grooves are "V" shaped grooves having an included angle of 30 ° -45 °.

4. The cartridge assembly of claim 1, wherein the cam surfaces are located at the through-hole opening inner wall, and both of the cam surfaces are symmetrical about a center of the through-hole opening.

5. The chuck assembly of claim 1, wherein at least one first detent is provided on the movable seat at the same end as the clamping slot; the inner wall of the lock sleeve is at least provided with a second positioning part matched with the first positioning part, and the second positioning part and the opening of the through hole are positioned on the same plane.

6. The chuck assembly of claim 5, wherein the first locating portion is a boss and the second locating portion is a recess or a retaining hole.

7. The chuck assembly of claim 6, wherein the boss projection height is not less than 0.5 mm.

8. The chuck assembly of claim 1, wherein each of said cam surfaces includes an upper position and a lower position, said upper position compressing said saw blade when said upper position abuts said retaining shoulder; when the low position is near the locating shoulder, the saw blade is released from the clamping slot.

9. The cartridge assembly of claim 1, wherein the arc angle of the cam surface is 60 ° -150 °.

10. The chuck assembly as claimed in claim 1, wherein the bottom of the fixed seat is a disc-shaped base and has a mounting hole in the middle thereof, the movable seat passing through the mounting hole; and the disc-shaped base deviates from the end face of the tool body and is provided with a limiting space.

11. The chuck assembly of claim 10, wherein the spacing space has a radius angle of 75 ° -100 °.

12. A jigsaw comprising a chuck assembly according to any one of claims 1 to 11.