TWM654491U - Handheld grinder - Google Patents

Abstract

The invention relates to a hand-held sander, comprising: a body and a working assembly. The body comprises a gripping member and a driving assembly connected to each other, the driving assembly comprises an output shaft; the working assembly comprises a base, a driving wheel, a driven wheel, a transmission belt, a sanding member, a rotating shaft and two clamping members, the base is arranged on the body, the driving wheel is sleeved on the output shaft, the rotating shaft is rotatably positioned on the base and penetrates and connects the driven wheel, the transmission belt is wound around the driving wheel and the driven wheel, The grinding part includes a hollow tube portion and a grinding part. The hollow tube portion is defined with an axial direction and a circumferential direction. The grinding part is arranged on the hollow tube portion along the circumferential direction. The two clamping parts are in a co-rotating relationship with the hollow tube portion. Each of the clamping parts is provided with an assembly hole with a non-circular contour. The rotating shaft includes an assembly section with an outer contour matching the assembly hole. The assembly section passes through the assembly holes of the two clamping parts to drive the grinding part to rotate.

Description

Handheld grinder

This creation is about grinding tools, especially a handheld grinder.

A grinder uses high-speed rotating grinding parts to perform surface treatment on objects, such as grinding, polishing, and even cutting operations. Common grinding parts include sanding belts, emery wheels, abrasive discs, etc.

The most common grinders are powered by electricity, which uses a motor to directly drive the grinding piece to rotate, resulting in a larger overall size and heavier weight. In addition, based on safety considerations and grip feel, the motor is installed far away from the user's grip, which causes the overall center of gravity to shift, easily causing a burden on the gripping hand, and making it impossible to use for a long time.

Therefore, it is necessary to provide a novel and advanced handheld grinder to solve the above problems.

The main purpose of this invention is to provide a handheld sander that is driven by gas, which can effectively simplify the overall structure and weight, and can quickly and accurately drive the sanding piece to rotate through the driving wheel, driven wheel and transmission belt.

To achieve the above-mentioned purpose, the invention provides a hand-held sander, comprising: a body and a working assembly. The body includes a grip and a driving assembly driven by a gas body, one end of the grip is connected to an air intake assembly, and the other end of the grip is provided with the driving assembly, and the driving assembly includes an output shaft; the working assembly includes a base, a driving wheel, a driven wheel, a transmission belt, a sanding piece, a rotating shaft and two clamping pieces, the base is provided on the body, the driving wheel is sleeved on the output shaft to form a co-rotating relationship, the rotating shaft is rotatably positioned on the base and penetrates and connects to the driven wheel to form a co-rotating relationship, the transmission belt is wound around the driving wheel and the driven wheel and The grinding piece includes a hollow tube and a grinding part. The hollow tube defines an axial direction and a circumferential direction. The grinding part is arranged on the hollow tube along the circumferential direction. The two clamping parts clamp the hollow tube together in the axial direction and prevent interference with the hollow tube in the circumferential direction. The two clamping parts and the grinding piece are in a synchronous rotation relationship. Each of the clamping parts is provided with an assembly hole with a non-circular contour. The rotating shaft includes an assembly section with an outer contour matching the assembly hole. The assembly section penetrates the assembly holes of the two clamping parts to drive the grinding piece to rotate synchronously.

1: Body

21: Grip

22: Drive assembly

221: Output shaft

23: Air intake assembly

3: Working components

41: Base

42: Driving wheel

43: driven wheel

44: Chamber

45: Transmission belt

5: Polishing parts

51: Hollow tube

511: Axial

512: Circumferential direction

513: ribs

52: Polishing Department

6: Rotating shaft

61: Assembly section

62: Expansion section

63: Through hole

7: Clamping parts

71: Assembly hole

72: Pressing part

73: Pushing part

81: Covering part

82:Workspace

83: Bearings

84: Clamping parts

85: Block sales

86: Cover

91: First direction

Figure 1 is a three-dimensional diagram of an embodiment of this creation.

Figure 2 is a disassembled diagram of an embodiment of this invention.

Figure 3 is an exploded view of another perspective of an embodiment of this invention.

Figure 4 is a cross-sectional view of an embodiment of this invention.

Figure 5 is a side view of Figure 1.

The following is only an example of the possible implementation of this creation, but it is not used to limit the scope of protection of this creation. The "one" or "at least one" before the terms mentioned in the text does not limit the quantity. It can also be "plural" according to needs. This change in quantity is also within the scope of protection, which should be explained first.

Please refer to Figures 1 to 5, which show an embodiment of the present invention. The handheld sander of the present invention includes: a body 1 and a working component 3.

The main body 1 includes a grip 21 and a driving assembly 22 driven by gas. One end of the grip 21 is connected to an intake assembly 23. The other end of the grip 21 is provided with the driving assembly 22. The driving assembly 22 includes an output shaft 221. The driving assembly 22 is driven by high-pressure gas entering through the intake assembly 23, and has the advantages of simple structure, light weight, clean power source and no pollution.

The working assembly 3 includes a base 41, a driving wheel 42, a driven wheel 43, a transmission belt 45, a grinding piece 5, a rotating shaft 6 and two clamping pieces 7. The base 41 is arranged on the main body 1. The driving wheel 42 is sleeved on the output shaft 221 to form a co-rotating relationship. The rotating shaft 6 is rotatably positioned on the base 41 and penetrates and connects the driven wheel 43 to form a co-rotating relationship. The transmission belt 45 is wound around the driving wheel 42 and the driven wheel 43 to form a co-rotating relationship. The grinding piece 5 includes a hollow tube 51 and a grinding part 52. The hollow tube 51 defines an axial 511 and a circumferential direction 512, the grinding part 52 is arranged on the hollow tube part 51 along the circumferential direction 512, the two clamping parts 7 clamp the hollow tube part 51 together in the axial direction 511 and prevent interference with the hollow tube part 51 in the circumferential direction 512, so that the two clamping parts 7 and the grinding part 5 are in a co-rotating relationship, each of the clamping parts 7 is provided with an assembly hole 71 with a non-circular contour, the rotating shaft 6 includes an assembly section 61 with an outer contour matching the assembly hole 71, and the assembly section 61 penetrates the assembly holes 71 of the two clamping parts 7 to drive the grinding part 5 to rotate synchronously.

In more detail, the output shaft 221 and the rotating shaft 6 are arranged in parallel and spaced apart along a first direction 1, and the gripping member 21 also extends along the first direction 91, so that the force of the gripping operation will pass through the output shaft 221 and the rotating shaft 6 along the first direction 91, and can effectively apply force to grind a specific part without slipping and deflection. In addition, the grinding member 5 is a grinding wheel, and the grinding part 52 is a brush, which can be deformed accordingly to the shape of the object to be grinded. In addition, the radial dimension of the driven wheel 43 is larger than the radial dimension of the driving wheel 42 to reduce the rotation speed and increase the torque, which is convenient for grinding operations; wherein, the transmission structure of the driven wheel 43 and the driving wheel 42 is conducive to quickly calculating the speed ratio and torque ratio, and can accurately and accurately transmit the force to drive the grinding piece 5 to rotate.

In more detail, the driven wheel 43 and the grinding member 5 are located on opposite sides of the base 41. The working assembly 3 further includes at least one bearing 83 and two clamping members 84. The at least one bearing 83 is positioned on the base 41. The rotating shaft 6 is inserted into the driven wheel 43 by passing through the at least one bearing 83. The outer side of the at least one bearing 83 abuts against the base 41. The driven wheel 43 is pressed against the inner side of the at least one bearing 83 along the axial direction 511, and then the driven wheel 43 and the rotating shaft 6 can rotate smoothly relative to the base 41. Furthermore, the two clamping members 84 are screwed to the two ends of the rotating shaft 6, one of the clamping members 84 abuts against the driven wheel 43 along the axial direction 511, and the other clamping member 84 abuts against one of the two clamping members 7 farther from the base 41 in the axial direction 511, thereby making the driven wheel 43, the rotating shaft 6 and the grinding member 5 stably positioned on the base 41. This combination makes it easy for the manufacturer to assemble and the user to quickly replace the grinding member 5. In this embodiment, each of the clamping members 7 is stamped from a metal plate, which has the advantages of fast, accurate and mass production.

The inner wall surface of the hollow tube portion 51 is convexly provided with a plurality of convex ribs 513 arranged at intervals along the circumferential direction 512. Each of the clamping members 7 further includes a pressing portion 72 and a plurality of pushing portions 73 protruding laterally from the pressing portion 72. The pressing portion 72 is pressed against the end surface of the hollow tube portion 51 along the axial direction 511. The plurality of pushing portions 73 protrude into the interior of the hollow tube portion 51 and abut against the plurality of convex ribs 513 in the circumferential direction 512. This assembly method has the advantages of easy and quick assembly and lightweight. In this embodiment, the driven wheel 43 is surrounded by a chamber 44, and the clamping member 84 is accommodated in the chamber 44 and presses against the driven wheel 43 along the axial direction 511. The driven wheel 43 can protect the clamping member 84 from being touched by surrounding components and can effectively reduce the size in the axial direction 511 to keep the overall volume small.

The rotating shaft 6 further includes an expanded section 62, the radial dimension of which is greater than the radial dimension of the connecting section 61. The expanded section 62 is connected to the connecting section 61, and the expanded section 62 abuts against one of the two clamping members 7 closer to the base 41 in the axial direction 511. The expanded section 62 and the clamping member 84 farther from the base 41 jointly clamp the two clamping members 7 to ensure that the grinding member 5 can maintain a stable connection with the rotating shaft 6 and will not easily come off when rotating at high speed. Furthermore, the rotating shaft 6 is provided with a through hole 63 perpendicular to the axial direction 511, and the through hole 63 is for a plug-in (such as a screwdriver) to be inserted, so as to provide a supporting force to the rotating shaft 6 when the clamping member 84 is rotated, and can effectively keep the rotating shaft 6 fixed.

The working assembly 3 further includes a stop pin 85, which passes through the rotating shaft 6 away from one side of the grinding member 5. The stop pin 85 is in an interference configuration with the at least one bearing 83 in the axial direction 511. This is a redundant mechanism specially designed for safety. When the clamping member 84 is unexpectedly loosened, the stop pin 85 can surely block the at least one bearing 83, so that the rotating shaft 6 cannot be separated from the base 41, so as to improve the safety of use and protect the personal safety of the operator and others.

The working assembly 3 further includes a cover 86, which is detachably mounted on one side of the base 41 to cover the driving wheel 42, the driven wheel 43 and the transmission belt 45. The cover 86 can effectively isolate foreign objects to ensure the smooth operation of the transmission mechanism inside.

The working assembly 3 further includes a covering portion 81, which is protruding from the base 41 and defines an open working space 82. The grinding piece 5 is accommodated in the working space 82. The covering portion 81 extends along the circumferential direction 512 and covers a portion of the grinding piece 5 perpendicular to the axial direction 511.

1: Body

21: Grip

22: Drive assembly

23: Air intake assembly

3: Working components

5: Polishing parts

Claims (10)

A hand-held sander comprises: a main body, including a grip and a driving assembly driven by a gas body, one end of the grip is connected to an air intake assembly, the other end of the grip is provided with the driving assembly, the driving assembly includes an output shaft; and a working assembly, including a base, a driving wheel, a driven wheel, a transmission belt, a sanding piece, a rotating shaft and two clamping pieces, the base is provided on the main body, the driving wheel is sleeved on the output shaft to form a co-rotating relationship, the rotating shaft is rotatably positioned on the base and is passed through and connected to the driven wheel to form a co-rotating relationship, the transmission belt is wound around the driving wheel and the driven wheel to form a co-rotating relationship, the sanding piece includes a hollow tube and a sanding part, the hollow tube defines a Axially and circumferentially, the grinding part is arranged on the hollow tube part along the circumferential direction, the two clamping parts clamp the hollow tube part together in the axial direction and prevent interference with the hollow tube part in the circumferential direction, so that the two clamping parts and the grinding part are in a co-rotating relationship, each of the clamping parts is provided with an assembly hole with a non-circular contour, the rotating shaft includes an assembly section with an outer contour matching the assembly hole, the assembly section penetrates the assembly holes of the two clamping parts to drive the grinding part to rotate synchronously. A handheld grinder as described in claim 1, wherein the working assembly further includes a covering portion, the covering portion protrudes from the base and defines an open working space, the grinding piece is accommodated in the working space, the covering portion extends along the circumferential direction and covers a portion of the grinding piece in a direction perpendicular to the axis. A handheld sander as described in claim 1, wherein the driven wheel and the sanding piece are located on opposite sides of the base, and the working assembly further includes at least one bearing and two clamping members, the at least one bearing is positioned on the base, the rotating shaft is passed through the at least one bearing and inserted into the driven wheel, the outer side of the at least one bearing abuts against the base, the driven wheel is pressed against the inner side of the at least one bearing along the axial direction, the two clamping members are screwed to the two ends of the rotating shaft, one of the clamping members abuts against the driven wheel along the axial direction, and the other of the clamping members abuts against one of the two clamping members farther away from the base in the axial direction, thereby stably positioning the driven wheel, the rotating shaft and the sanding piece on the base. In the hand-held grinder as described in claim 3, the driven wheel is surrounded by a chamber, and the clamping member is accommodated in the chamber and presses against the driven wheel along the axial direction. A handheld grinder as described in claim 3, wherein the working assembly further includes a stop pin, the stop pin passes through a side of the rotating shaft away from the grinding piece, and the stop pin is in an interference configuration with the at least one bearing in the axial direction. A hand-held sander as described in claim 1, wherein the working assembly further includes a cover, which is detachably mounted on one side of the base to cover the driving wheel, the driven wheel and the transmission belt. A handheld grinder as described in claim 1, wherein the inner wall surface of the hollow tube is protrudingly provided with a plurality of ribs arranged at intervals along the circumferential direction, and each of the clamping parts further includes a pressing portion and a plurality of pushing portions protruding laterally from the pressing portion, the pressing portion presses against the end surface of the hollow tube along the axial direction, and the plurality of pushing portions protrude into the interior of the hollow tube and abut against the plurality of ribs in the circumferential direction. A hand-held sander as described in claim 1, wherein the rotating shaft is provided with a through hole perpendicular to the shaft, and the through hole is for the plug-in to be inserted. A handheld sander as described in any one of claims 1 to 8, wherein the output shaft and the rotating shaft are arranged in parallel and spaced apart along a first direction, and the grip also extends along the first direction. The hand-held sander as described in claim 4, wherein the working assembly further comprises a covering portion, the covering portion protrudes from the base and defines an open working space, the sanding piece is accommodated in the working space, the covering portion extends along the circumferential direction and covers a portion of the sanding piece perpendicular to the axis; the working assembly further comprises a stop pin, the stop pin passes through the rotating shaft. The stop pin is disposed in an interference configuration with the at least one bearing in the axial direction away from one side of the polishing member; the working assembly further comprises a cover, which is detachably disposed on one side of the base to cover the driving wheel, the driven wheel and the transmission belt; the inner wall surface of the hollow tube is convexly provided with a plurality of ribs disposed at intervals along the circumference, and each of the clamping members further comprises a pressing portion and a plurality of transverse protrusions The push-pushing part of the pressing part is pressed against the end surface of the hollow tube along the axial direction, and the plurality of pushing parts protrude into the interior of the hollow tube and abut against the plurality of ribs in the circumferential direction; the rotating shaft is provided with a through hole perpendicular to the axial direction, and the through hole is used for plug-in connection; the output shaft and the rotating shaft are arranged in parallel at intervals along a first direction, and the gripping member is also arranged along the first direction. The grinding part is a brush; each of the clamping parts is stamped from a metal plate; the radial dimension of the driven wheel is larger than the radial dimension of the driving wheel; the rotating shaft further includes an expanded section, the radial dimension of the expanded section is larger than the radial dimension of the connecting section, the expanded section is connected to the connecting section, and the expanded section abuts against one of the two clamping parts closer to the base in the axial direction.

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