# US 11,027,349 B2 · Power tool

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- Number: US 11,027,349 B2
- Document ID: US11027349B2
- Status: Granted
- Kind: B2
- Application number: 17/112,530
- Filed: 2020-12-04
- Published: 2021-03-25
- Granted: 2021-06-08
- Earliest claimed: 2018-06-05
- Assignees: Nanjing Chervon Industry Co., Ltd.
- Applicants: Nanjing Chervon Industry Co., Ltd.
- Inventors: Qi Ling; Rong Wang; Yang Li
- Web page: https://patentgrep.com/patent/US11027349B2

## CPC

- B23D 61/006: {Oscillating saw blades}
- B24B 23/04: with oscillating grinding tools; Accessories therefor
- B25D 17/00: Details of, or accessories for, portable power-driven percussive tools {(details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00)}
- B25D 17/24: Damping the reaction force {(resiliently mounted handles B25D17/043; dampers in connections of hammers to backhoes E02F3/966)}
- B25F 5/00: Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F 5/006: {Vibration damping means}
- B25F 5/02: Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)}
- B26D 2001/004: {not rotating}
- B26D 2001/006: {the cutting blade having a special shape, e.g. a special outline, serrations}
- B27B 19/006: {with oscillating saw blades; Hand saws with oscillating saw blades}
- B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q)
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B25D: PERCUSSIVE TOOLS {(percussive machines for forging B21J; hand-held drilling machines, in general B23B45/00, for wood B27C3/08; drilling machines, used for mining or quarrying, with reciprocating tool which is turned intermittently when out of contact with the working face E21B1/00)}
- B25F: COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR {(machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass B23P23/00 and subgroups)}
- B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04)
- B27B: SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR (saws specially adapted for pruning or debranching A01G3/08; sawing apparatus specially adapted for felling trees A01G23/091; features not restricted to a particular type of wood saw B23D, e.g. attaching saw blades B23D51/00; machine tool frames, beds, pillars or like members, in general B23Q1/01)

## Abstract

A power tool includes: a power assembly including a motor, the motor including a motor shaft rotatable about a motor axis; an output assembly including an output shaft; a transmission assembly; a first housing; a second housing; wherein the power tool is provided with a first vibration isolation plane and a second vibration isolation plane; the first vibration isolation plane is provided with a first vibration isolation block, and the second vibration isolation plane is provided with a second vibration isolation block; the whole composed of the first vibration isolation block and the second vibration isolation block is at least provided with a spacing portion between the first housing and the second housing; the second housing is spaced apart from the first housing at the spacing portion; the first vibration isolation block and the second vibration isolation block are separated from each other.

## Claims

### Claim 1

A power tool, comprising:
a power assembly comprising a motor, the motor having a motor shaft rotatable about a motor axis;
an output assembly comprising an output shaft configured to output power;
a transmission assembly configured to realize power transmission between the power assembly and the output assembly;
a first housing supporting at least the power assembly, the transmission assembly and the output assembly; and
a second housing surrounding at least part of the first housing, the second housing being further formed with a handle portion configured for a user to hold;
wherein the power tool is provided with a first vibration isolation plane and a second vibration isolation plane, the first vibration isolation plane is provided with a first vibration isolation block, the second vibration isolation plane is provided with a second vibration isolation block, a whole composed of the first vibration isolation block and the second vibration isolation block is at least provided with a spacing portion provided between the first housing and the second housing, the second housing is spaced apart from the first housing at the spacing portion, the first vibration isolation block and the second vibration isolation block are separated from each other, and at least part of the first vibration isolation block or at least part of the second vibration isolation block is arranged inside the handle portion, and
wherein a structure of the power tool that generates vibration is defined as a vibrating body, the vibrating body at least comprises the power assembly, the output assembly, the transmission assembly and the first housing, the vibrating body has a center of gravity, a length of the vibrating body in a direction along the motor axis is L, the first vibration isolation plane and the motor axis are perpendicular to each other, and a distance between the first vibration isolation plane and the center of gravity of the vibrating body along the motor axis is L1, and a ratio of the distance L1 between the first vibration isolation plane and the center of gravity of the vibrating body in the motor axis to the length L of the vibrating body in the motor axis is greater than or equal to 0 and less than or equal to 0.3.

### Claim 2 (depends on 1)

The power tool of claim 1, wherein the second vibration isolation plane and the motor axis are perpendicular to each other, a distance between the first vibration isolation plane and the second vibration isolation plane is L2, a ratio of the distance L2 between the first vibration isolation plane and the second vibration isolation plane to the length L of the vibrating body along the motor axis is greater than or equal to 0.3 and less than or equal to 0.7.

### Claim 3 (depends on 1)

The power tool of claim 1, wherein the center of gravity of the vibrating body is arranged between the first vibration isolation plane and the second vibration isolation plane.

### Claim 4 (depends on 1)

The power tool of claim 1, wherein the vibrating body further defines a third vibration isolation plane perpendicular to the motor axis, a third vibration isolation block is provided on the third vibration isolation plane, and the third vibration isolation plane is arranged between the first vibration isolation plane and the second vibration isolation plane.

### Claim 5 (depends on 1)

The power tool of claim 1, wherein the first vibration isolation plane and the second vibration isolation plane are parallel to each other, and the first vibration isolation block and the second vibration isolation block are spaced apart from each other in a direction perpendicular to the first vibration isolation plane.

### Claim 6 (depends on 1)

The power tool of claim 1, wherein the first housing is symmetrical about a mid-plane, the number of the first vibration isolation blocks is at least two, and the first vibration isolation blocks are symmetrically distributed on both sides of the mid-plane.

### Claim 7 (depends on 1)

The power tool of claim 1, wherein the first vibration isolation plane and the second vibration isolation plane are parallel to each other and an orthographic projection of the second vibration isolation block of the second vibration isolation plane on a plane parallel to the first vibration isolation plane and an orthographic projection of the first vibration isolation block of the first vibration isolation plane on that plane at least partially intersect.

### Claim 8 (depends on 1)

The power tool of claim 1, wherein the output shaft is capable of oscillating about an output shaft axis within an oscillating angle A and the oscillating angle A of the output shaft is greater than or equal to 3.6 and less than or equal to 5.

### Claim 9 (depends on 1)

The power tool of claim 1, wherein the motor has a maximum rotational speed of R rpm and the maximum rotational speed R of the motor is greater than or equal to 20,000 and less than or equal to 22,000.

### Claim 10 (depends on 1)

The power tool of claim 1, wherein the number of the first vibration isolation blocks is at least two, the first vibration isolation blocks are sequentially arranged in a circumferential direction around the motor axis, and, in the circumferential direction, two adjacent first vibration isolation blocks have a gap in between.

### Claim 11 (depends on 1)

The power tool of claim 1, wherein the output shaft is capable of oscillating about an output shaft axis within an oscillating angle A, the transmission assembly comprises a hit portion and an oscillating rod enabled to be hit by the hit portion in a direction F of an excitation force, and a direction D of a positive stiffness of at least one first vibration isolation block and the direction F of the excitation force form an angle greater than or equal to 0 degrees and less than or equal to 60 degrees.

### Claim 12 (depends on 11)

The power tool of claim 11, wherein the direction D of the positive stiffness of at least one first vibration isolation block is parallel to the direction F of the excitation force.