CN217413827U

CN217413827U - Screw clamping device of electric screw tool and electric screw tool assembly thereof

Info

Publication number: CN217413827U
Application number: CN202221509815.9U
Authority: CN
Inventors: 周肃虎; 唐碧异; 盛剑翔
Original assignee: Zhejiang Jinshun Intelligent Equipment Co ltd
Current assignee: Zhejiang Jinshun Intelligent Equipment Co ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2022-09-13
Anticipated expiration: 2032-06-15

Abstract

A screw clamping device of an electric screw tool and an electric screw tool assembly thereof are provided, wherein the screw clamping device comprises a shell, a rotary disc, a limiting seat, n clamping jaws and n positioning pins, wherein n is more than or equal to 3; the shell is provided with an inner cavity which is through along the axial direction; the rotary disc is rotatably but not axially movably arranged in the inner cavity of the shell and is provided with a central through hole and n inclined through grooves surrounding the central through hole; the limiting seat is connected with the bottom end of the shell and provided with a screw head accommodating through hole and n radial through grooves, and one ends of the n radial through grooves respectively penetrate through the screw head accommodating through hole; the n clamping jaws are respectively arranged in the n radial through grooves, and the n positioning pins respectively penetrate through the n inclined through grooves of the rotary disc and are respectively connected with the n clamping jaws; when the rotary disc is rotated, the n positioning pins respectively drive the n clamping jaws to move along the radial through grooves under the action of the n inclined through grooves. The structure and the manufacturing process of the utility model are simple, the operation is convenient, and the use is safe and reliable.

Description

Screw clamping device of electric screw tool and electric screw tool assembly thereof

Technical Field

The utility model relates to an electric tool especially relates to electric screw tool's screw clamping device.

Background

The electric screwdriver is used for screwing a screw onto a workpiece and mainly comprises a shell, a motor arranged in the shell, a planetary reduction gear mechanism connected with the motor and a screwdriver head connected with the planetary reduction gear mechanism. During operation, the torque of the motor is transmitted to the screwdriver head through the planetary reduction gear mechanism, so that the screwdriver head rotates, the screwdriver head is attached to the screw, and the screw is quickly screwed down. When a screw is screwed into a workpiece (such as hard wood, thin steel plate, plastic steel, decorative keel and the like), the screw is usually positioned by fingers of one hand, and a screwdriver is operated by the other hand, so that the operation is inconvenient, and the screw is easy to deviate, and the fingers are injured due to poor operation, thereby causing safety accidents.

In view of the above-mentioned disadvantages, some manufacturers have developed screw retaining devices that eliminate the need for the operator to manually hold the screw during screwing and that avoid tilting of the screw during screwing. However, the existing screw retaining device has the following defects: 1. most of the existing screw retaining devices are butterfly-shaped and irregular claw-shaped, the internal structure and the manufacturing process are complex, and the production difficulty is high; 2. the structure of the existing screw retaining device is provided with a plurality of bulges and an external spring/torsion spring, so that people are easily injured by mistake; 3. the existing screw retaining device and the screw tool cannot be quickly disassembled, and the screw unscrewing efficiency can be greatly influenced when the screw needs to be unscrewed.

Disclosure of Invention

The utility model aims to solve the technical problem that a screw clamping device of electric screw instrument is provided, its structure and manufacturing process are comparatively simple, convenient operation uses safe and reliable.

The utility model aims to solve another technical problem provide a can realize the screw clamping device who installs and removes fast with electric screw instrument.

The utility model discloses another technical problem that will solve provides an electric screw instrument subassembly.

According to the embodiment of the utility model, the screw clamping device of the electric screw tool comprises a shell, a rotary disc, a limiting seat, n clamping jaws and n positioning pins, wherein n is more than or equal to 3; the shell is provided with an inner cavity which is through along the axial direction; the rotary disc is rotatably but not axially movably arranged in the inner cavity of the shell and is provided with a central through hole and n inclined through grooves surrounding the central through hole; the limiting seat is connected with the bottom end of the shell and provided with a screw head accommodating through hole and n radial through grooves, and one ends of the n radial through grooves respectively penetrate through the screw head accommodating through hole; the n clamping jaws are respectively arranged in the n radial through grooves, and the n positioning pins respectively penetrate through the n inclined through grooves of the rotary disc and are respectively connected with the n clamping jaws; when the rotary disc is rotated, the n positioning pins respectively drive the n clamping jaws to move along the radial through grooves under the action of the n inclined through grooves.

According to the screw clamping device of the electric screw tool, the outer side surface of the top end of the connecting shell is provided with the plurality of clamping blocks, and the plurality of clamping blocks are used for being connected with the shell of the electric screw tool in a rotating and buckling mode.

The electric screw tool assembly according to the embodiment of the utility model comprises an electric screw tool which comprises a shell, and is characterized in that the electric screw tool assembly also comprises the screw clamping device; the screw clamping device is detachably connected with a shell of the electric screw tool.

The utility model discloses at least, have following advantage:

1. the screw clamping device provided by the embodiment of the utility model can convert the rotation of the rotary disc into the radial movement of the clamping jaws, thereby achieving the purpose of locking screw heads with different specifications, and has the advantages of small number of adopted parts, no need of parts with irregular shapes and external springs or torsional springs, simple structure and manufacturing process, and safe and reliable use;

2. the utility model discloses screw clamping device is connected with electric screw instrument's shell detachably, can dismantle screw clamping device fast according to the user's demand, and it is very convenient to use.

Drawings

Fig. 1 and 2 show an assembly diagram and an explosion diagram of a screw clamping device and an electric screw tool according to an embodiment of the present invention, respectively.

Fig. 3 and 4 show an exploded view and a cross-sectional view of a screw clamping device according to an embodiment of the present invention, respectively.

Fig. 5 is a schematic view of a stop block of an electric screw tool according to an embodiment of the present invention.

Fig. 6 shows a schematic view of a turn disc according to an embodiment of the present invention.

Fig. 7 shows a schematic view of a screw clamping device according to an embodiment of the present invention being screwed into a screw.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to fig. 1 to fig. 6. The utility model discloses electric screw tool's screw clamping device 100 includes casing 1, gyration dish 2, spacing seat 3, three jack catch 4 and three locating pins 5.

The housing 1 has an inner space 10 running through it in the axial direction. In the present embodiment, the housing 1 includes a movable housing 11 and a connecting housing 12 connectable to the electric screw tool 200, and the connecting housing 12 and the top end of the movable housing 11 are connected to each other in a relatively axially movable but relatively non-rotatable manner. Specifically, the side surface of the connection housing 12 is provided with a plurality of guide grooves 121 extending in the axial direction; the top end of the movable shell 11 is provided with a plurality of guide lugs 111 protruding along the radial direction; the plurality of guide protrusions 111 protrude into the plurality of guide grooves 121, respectively, and can move along the guide grooves 121.

Between the connecting housing 12 and the displacement housing 11, an elastic element 6 is provided, the connecting housing 12 being axially displaceable relative to the displacement housing 11 against the elastic force of the elastic element 6. In the present embodiment, the elastic member 6 is a spring. The connecting shell 12 has a hollow outer cylinder 12a and a hollow inner cylinder 12b, and the top periphery of the inner cylinder 12b is connected with the inner wall of the outer cylinder 12 a; a spring limiting part 112 is arranged in the inner cavity of the movable shell 11; the bottom end of the spring 6 abuts against the spring stopper 112, and the top end of the spring 6 is fitted to the outside of the inner cylinder 12 b.

A rotary disk 2 is rotatably but axially immovably disposed in the inner cavity of the movable housing 11, the rotary disk 2 having a central through hole 20 and three through slots 21 surrounding the central through hole, both ends of each through slot 21 being located at different circumferences. In the present embodiment, the inner cavity of the moving housing 11 is provided with a first step 113 and a second step 114 which abut against both end surfaces of the turn disc 2, respectively. The side of the rotary disk 2 is provided with an operating handle 23 protruding along the radial direction, the side of the shell 1 is provided with an arc through groove 13 extending along the circumferential direction, and the operating handle 23 penetrates through the arc through groove 13.

The limiting seat 3 is detachably connected with the bottom end of the movable shell 11 through a plurality of first screws 71, the limiting seat 3 is provided with a screw head accommodating through hole 30 and three radial through grooves 31, and one ends of the three radial through grooves 31 respectively penetrate through the screw head accommodating through hole 30. In the present embodiment, the stopper base 3 has a plate shape.

The three claws 4 are respectively arranged in the three radial through grooves 31, and the three positioning pins 5 respectively penetrate through the three inclined through grooves 21 of the rotary disc 2 and are respectively connected with the three claws 4. In the present embodiment, each of the claws 4 includes a claw base 42 and a claw body 41. The jaw body 41 is disposed in the radial through slot 31 and is connected to the jaw base 42 by a plurality of second screws 72. The jaw base 42 is located between the turn disc 2 and the jaw body 41 and is connected to the positioning pin 5 passing through the inclined through groove 21.

Preferably, the claw body 41 is made of a weak magnetic magnet material, which has a certain attraction effect when the screw head 90 of the screw 9 enters the screw head receiving through hole 30, and when the electric screw tool 200 is operated, the generated torque force can overcome the weak magnetic force to perform an effective action.

When the screw clamping device 100 of the present embodiment is to be used, it is first connected to the housing 201 of the electric screw tool 200, as shown in fig. 1. In this embodiment, the outer side surface of the top end of the connecting housing 12 is provided with a plurality of clamping blocks 123, the housing 201 is provided with a plurality of bayonets 203 respectively matched with the plurality of clamping blocks 123 and a clamping slot (not shown in the figure) located behind the bayonets 203, after the plurality of clamping blocks 123 enter the clamping slots from the plurality of bayonets 203 and rotate, the plurality of clamping blocks 123 are rotatably fastened and connected with the housing 201 of the electric screw tool, and the screwdriver seat 206 of the electric screw tool 200 penetrates through the connecting housing 12 and extends into the movable housing 11.

Then, the batch head 205 matching the screw 9 to be screwed is selected to be fitted into the batch head seat 206. When the bit 205 is installed, the bottom surface 33 of the limit seat 3 can be pressed to move the movable housing 11 and the limit seat 3 toward the direction close to the electric screw tool 200, thereby facilitating installation. Then, the screw head 90 of the screw 9 is passed through the screw head receiving through hole 30 of the retaining seat 3. When the operating handle 23 of the rotary disk 2 is rotated, the three positioning pins 5 respectively drive the three claws 4 to move radially along the radial through grooves 31 under the action of the three inclined through grooves 21, so that the screw heads 90 are clamped. When the bit 205 abuts against the screw head 90, the motor of the electric screw tool 200 is activated to rotate the bit seat 206 and the bit 205 connected to the bit seat 206, thereby screwing the screw 9 into the workpiece 300. To ensure that the screw head 90 is fully screwed into the workpiece 300, the distance B over which the coupling housing 12 is axially movable relative to the displacement housing 11 is set to be greater than the distance a over which the screw head 90 projects into the screw clamping device 100. As shown in fig. 7, when the bottom surface 33 of the position limiting seat 3 touches the top surface 303 of the workpiece 300, the connecting shell 12 can move downwards against the elastic force of the spring 6, so that the bit 205 can screw the screw 9 into the bottom.

When the user needs to unscrew the screw 9, the screw clamping device 100 can be quickly detached, the interference operation is prevented, the working efficiency is improved, and the user can also disassemble, assemble and use according to own preference, so that the screw clamping device is quick and effective.

In this embodiment, the power screw tool 200 is a straight shank power screwdriver. The parts of the screw clamping device 100 are mostly shaft-shaped and square parts, screws, springs and the like are standard parts, the production difficulty is low, the manufacture is easy, the shell 1 is cylindrical and has no edges and corners, and the springs 6 are built-in, so that the use is safe and reliable.

In other embodiments, the number of jaws 4 is greater than three, such as four, five, etc., and accordingly, the number of positioning pins 5, oblique through slots 21 and radial through slots 31 corresponds to the number of jaws 4.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A screw clamping device of an electric screw tool is characterized in that the clamping device of the electric screw tool comprises a shell, a rotary disc, a limiting seat, n clamping jaws and n positioning pins, wherein n is more than or equal to 3;

the shell is provided with an inner cavity which penetrates through the shell along the axial direction;

the rotary disc is rotatably but not axially movably arranged in the inner cavity of the shell and is provided with a central through hole and n inclined through grooves surrounding the central through hole;

the limiting seat is connected with the bottom end of the shell and provided with a screw head accommodating through hole and n radial through grooves, and one ends of the n radial through grooves respectively penetrate through the screw head accommodating through hole;

the n clamping jaws are respectively arranged in the n radial through grooves, and the n positioning pins respectively penetrate through the n inclined through grooves of the rotary disc and are respectively connected with the n clamping jaws; when the rotary disc is rotated, the n positioning pins respectively drive the n clamping jaws to move along the radial through grooves under the action of the n inclined through grooves.

2. The screw holding device of the power screw tool as claimed in claim 1, wherein said housing includes a movable housing and a connection housing connectable to said power screw tool, said connection housing and a top end of said movable housing being connected to each other in a relatively axially movable but non-relatively rotatable manner, said rotary disk being disposed in said movable housing, said stopper seat being connected to a bottom end of said movable housing;

an elastic element is arranged between the connecting housing and the moving housing, and the connecting housing can move axially relative to the moving housing against the elastic force of the elastic element.

3. A screw retaining device for a power screw tool as defined in claim 2, wherein said coupling housing has a hollow outer cylindrical portion and a hollow inner cylindrical portion, a top peripheral edge of said inner cylindrical portion being connected to an inner wall of said outer cylindrical portion; a spring limiting part is arranged in the inner cavity of the movable shell;

the elastic element is a spring, the bottom end of the spring abuts against the spring limiting part, and the top end of the spring is sleeved outside the inner cylinder body part.

4. A screw retaining device for a power screw tool as claimed in claim 2, wherein said coupling housing is provided at a side thereof with a plurality of axially extending guide grooves;

the top end of the movable shell is provided with a plurality of guide convex blocks protruding along the radial direction; the plurality of guide projections extend into the plurality of guide grooves respectively and can move along the guide grooves.

5. The screw retaining device of claim 2, wherein the outer surface of the top end of the connecting housing has a plurality of locking blocks for rotatably engaging with the housing of the power screw tool.

6. The screw clamp device of claim 1, wherein each of said jaws includes a jaw base and a jaw body;

the jaw main body is arranged in the radial through groove and is connected with the jaw base through a screw; the claw base is positioned between the rotary disc and the claw main body and is connected with the positioning pin penetrating through the inclined through groove.

7. The screw clamp device of claim 6, wherein each of the jaw bodies is made of a magnetic material.

8. A screw holding device for a power screw tool as claimed in claim 1, wherein said rotary disk is provided at a side surface thereof with an operating handle projecting in a radial direction, and said housing is provided at a side surface thereof with an arc-shaped through groove extending in a circumferential direction, said operating handle passing through said arc-shaped through groove.

9. The screw holding device of an electric screw tool as claimed in claim 1, wherein said stopper seat is plate-shaped and detachably connected to the bottom end of said housing by a plurality of screws.

10. A screw retaining device for a power screw tool as claimed in claim 1, wherein said power screw tool is a power screwdriver.

11. A power screw tool assembly comprising a power screw tool including a housing, characterized in that the power screw tool assembly further comprises a screw clamping device according to any one of claims 1 to 10;

the screw clamping device is detachably connected with a shell of the electric screw tool.