EP-4741103-A1 - POWER TOOL

EP4741103A1EP 4741103 A1EP4741103 A1EP 4741103A1EP-4741103-A1

Abstract

A power tool includes a cylinder at least partially disposed in a housing, where gas is stored in the cylinder. The cylinder includes: an inflation nozzle, where the cylinder is inflated with the gas in advance through the inflation nozzle; an inflation valve, where the gas filled through the inflation nozzle flows through the inflation valve and then enters the cylinder; and a pressure relief valve disposed between the inflation nozzle and the inflation valve, where when a pressure of the gas filled through the inflation nozzle is greater than a first preset pressure, the filled gas is released through the pressure relief valve.

Inventors

HAO, JINGDONG
YANG, BIN
ZHOU, Mingqi
YANG, JUNYONG
LI, Da

Assignees

Nanjing Chervon Industry Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240909

Claims (20)

A power tool, comprising: a housing; a power output portion at least partially disposed in the housing; a cylinder at least partially disposed in the housing, wherein gas is stored in the cylinder; and a piston driven by the power output portion, wherein the piston is disposed in the cylinder and moves in the cylinder to compress gas in the cylinder; wherein the cylinder comprises: an inflation nozzle, wherein the cylinder is inflated with the gas in advance through the inflation nozzle; an inflation valve, wherein the gas filled through the inflation nozzle flows through the inflation valve and then enters the cylinder; and a pressure relief valve disposed between the inflation nozzle and the inflation valve, wherein when a pressure of the gas filled through the inflation nozzle is greater than a first preset pressure, the filled gas is released through the pressure relief valve.
The power tool according to claim 1, wherein the pressure relief valve allows one-way flow.
The power tool according to claim 1, wherein the inflation valve allows one-way flow.
The power tool according to claim 1, wherein the inflation valve restricts gas in the cylinder from flowing out of the cylinder through the inflation valve.
The power tool according to claim 1, wherein the inflation valve restricts gas from entering the cylinder when a pressure in the cylinder exceeds a second preset pressure.
The power tool according to claim 5, wherein the first preset pressure is less than or equal to the second preset pressure.
The power tool according to claim 1, wherein the cylinder comprises: a cylinder barrel portion provided with a chamber, wherein the chamber is configured to store gas; and an inflation portion connected to the chamber through the inflation valve.
The power tool according to claim 7, wherein the inflation portion comprises a gas passage portion, the inflation nozzle and the inflation valve are disposed at two ends of the gas passage portion, and the pressure relief valve is disposed at the gas passage portion.
The power tool according to claim 8, wherein when the pressure relief valve and the inflation valve are in a closed state, a gas pressure in the gas passage portion is greater than or equal to atmospheric pressure.
The power tool according to claim 8, wherein the gas passage portion forms a second gas chamber, the second gas chamber has a certain length, and the pressure relief valve releases the gas along a direction intersecting with a length direction of the second gas chamber.
The power tool according to claim 1, wherein the cylinder comprises an inner cylinder, and the piston moves in the inner cylinder.
The power tool according to claim 11, wherein the cylinder further comprises an outer cylinder disposed around the inner cylinder, the inner cylinder communicates with the outer cylinder, and the inflation nozzle, the inflation valve, and the pressure relief valve are disposed on the outer cylinder separately.
The power tool according to claim 12, wherein a first threaded segment is provided on an outer sidewall of the inner cylinder, a second threaded segment is provided on an inner sidewall of the outer cylinder, and the first threaded segment meshes with the second threaded segment.
The power tool according to claim 1, wherein an inflation hole corresponding to the inflation nozzle is comprised on the housing; and a retaining member is further comprised, the retaining member is configured to fix the cylinder, the retaining member comprises a positioning portion, the positioning portion is at least partially disposed on the cylinder, and the positioning portion indicates a position where the inflation nozzle is assembled with the inflation hole.
The power tool according to claim 14, wherein the positioning portion comprises a first indicating structure, the cylinder is provided with a second indicating structure, and when the first indicating structure and the second indicating structure meet a preset relationship, the cylinder is fixed at a preset position causing the inflation nozzle to correspond to the inflation hole.
A power tool, comprising: a housing; a power output portion at least partially disposed in the housing; a cylinder at least partially disposed in the housing, wherein gas is stored in the cylinder; a piston driven by the power output portion, wherein the piston is disposed in the cylinder and moves in the cylinder to compress the gas in the cylinder; an inflation nozzle, wherein the cylinder is inflated with the gas in advance through the inflation nozzle; and a one-way pressure relief valve disposed on an inflation downstream side of the inflation nozzle, wherein the one-way pressure relief valve communicates with an outside of the cylinder for an escape of the gas.
A power tool, comprising: a housing; a power output portion at least partially disposed in the housing; a cylinder at least partially disposed in the housing, wherein gas is stored in the cylinder; and a piston driven by the power output portion, wherein the piston is disposed in the cylinder and moves in the cylinder to compress the gas in the cylinder; wherein the cylinder comprises: an inflation nozzle, wherein the cylinder is inflated with the gas in advance through the inflation nozzle, and the inflation nozzle restricts the gas from being released from the inflation nozzle; and a one-way pressure relief valve disposed on an inflation downstream side of the inflation nozzle, wherein when a pressure of the gas filled through the inflation nozzle is greater than a first preset pressure, the filled gas is released through the one-way pressure relief valve.
The power tool according to claim 17, wherein the cylinder comprises an inner cylinder, and the piston moves in the inner cylinder.
The power tool according to claim 18, wherein the cylinder further comprises an outer cylinder disposed around the inner cylinder, the inner cylinder communicates with the outer cylinder, and the inflation nozzle and the one-way pressure relief valve are disposed on the outer cylinder separately.
The power tool according to claim 19, wherein a first threaded segment is provided on an outer sidewall of the inner cylinder, a second threaded segment is provided on an inner sidewall of the outer cylinder, and the first threaded segment meshes with the second threaded segment.

Description

This application claims priority to Chinese Patent Application No. 202311267443.2 filed with the China National Intellectual Property Administration (CNIPA) on Sept. 27, 2023, Chinese Patent Application No. 202311261298.7 filed with the CNIPA on Sept. 27, 2023, Chinese Patent Application No. 202311257589.9 filed with the CNIPA on Sept. 27, 2023, Chinese Patent Application No. 202322645843.4 filed with the CNIPA on Sept. 27, 2023, and Chinese Patent Application No. 202322645506.5 filed with the CNIPA on Sept. 27, 2023, the disclosures of which are incorporated herein by reference in their entireties. TECHNICAL FIELD The present application relates to a tool, for example, a power tool with a cylinder. BACKGROUND A nail gun in the related art is used as a nailing tool. Nail guns in the market may be classified into mechanical nail guns and cylinder-type nail guns according to principle modes. The mechanical nail guns may be classified into spring-type nail guns, flywheel-type nail guns, and friction-wheel-type nail guns according to energy storage modes. The cylinder-type nail guns may be classified into single-cylinder nail guns and double-cylinder nail guns according to the number of cylinders. The cylinder-type nail guns may be classified into nail guns with positive-pressure energy storage and nail guns with negative-pressure energy storage according to energy storage modes. In the related art, a cylinder-type nail gun compresses gas in a cylinder, and the gas pushes out a firing assembly to perform nailing. Gas is pre-filled, through an inflation nozzle, into a nail gun inflated with gas in advance. Therefore, no external air pressure source is required. In an inflation process, a cylinder, the inflation nozzle, and components in the cylinder are easily damaged by an excessive inflation pressure. This part provides background information related to the present application, and the background information is not necessarily the existing art. SUMMARY An object of the present application is to solve or at least alleviate part or all of the preceding problems. Therefore, an object of the present application is to provide a power tool with cylinder components that can be protected. To achieve the preceding object, the present application adopts the technical solutions below. In a first aspect, an example of the present application provides a power tool. The power tool includes: a housing; a power output portion at least partially disposed in the housing; a cylinder at least partially disposed in the housing, where gas is stored in the cylinder; and a piston driven by the power output portion, where the piston is disposed in the cylinder and moves in the cylinder to compress the gas in the cylinder. The cylinder includes: an inflation nozzle, where the cylinder is inflated with the gas in advance through the inflation nozzle; an inflation valve, where the gas filled through the inflation nozzle flows through the inflation valve and then enters the cylinder; and a pressure relief valve disposed between the inflation nozzle and the inflation valve, where when a pressure of the gas filled through the inflation nozzle is greater than a first preset pressure, the filled gas is released through the pressure relief valve. In some examples, the pressure relief valve allows one-way flow. In some examples, the inflation valve allows one-way flow. In some examples, the inflation valve restricts the gas in the cylinder from flowing out of the cylinder through the inflation valve. In some examples, the inflation valve restricts the gas from entering the cylinder when a pressure in the cylinder exceeds a second preset pressure. In some examples, the first preset pressure is less than or equal to the second preset pressure. In some examples, the cylinder includes: a cylinder barrel portion provided with a chamber, where the chamber is configured to store the gas; and an inflation portion connected to the chamber through the inflation valve. In some examples, the inflation portion includes a gas passage portion, the inflation nozzle and the inflation valve are disposed at two ends of the gas passage portion, and the pressure relief valve is disposed on the gas passage portion. In some examples, when the pressure relief valve and the inflation valve are in a closed state, a gas pressure in the gas passage portion is greater than or equal to atmospheric pressure. In some examples, the gas passage portion forms a second gas chamber, the second gas chamber has a certain length, and the pressure relief valve releases the gas along a direction intersecting with a length direction of the second gas chamber. In some examples, the cylinder includes an inner cylinder, and the piston moves in the inner cylinder. In some examples, the cylinder further includes an outer cylinder disposed around the inner cylinder, the inner cylinder communicates with the outer cylinder, and the inflation nozzle, the inflation valve, and the pressure relief