US-20260124727-A1 - SPRING-LOADED NAIL GUN

US20260124727A1US 20260124727 A1US20260124727 A1US 20260124727A1US-20260124727-A1

Abstract

A spring-loaded nail gun, including a guide rod, striking spring, striking unit, and drive unit, the striking unit including a striking block and striker, the drive unit including an electric motor and lifting member; a sleeve is provided on the guide rod; a slot fitted with the sleeve is provided on the striking block; the sleeve has limiting and base portions which are axially distributed, outer diameter of the limiting portion being smaller than that of the base; an end portion of the striking spring is sleeved on the limiting portion and abuts the base; the sleeve is pressed by the striking spring into the slot, including the end portion, which is radially bidirectionally limited by the limiting portion and the circumferential inner wall of the slot, which enhances structural stability of the end portion of the striking spring and prevents deformation over prolonged operation.

Inventors

Chenghao Yang

Assignees

Zhejiang Prulde Electric Appliance Co., Ltd.

Dates

Publication Date: 20260507
Application Date: 20251106
Priority Date: 20241107

Claims (11)

1 . A spring-loaded nail gun, comprising: a guide rod; a striking spring sleeved over the guide rod with a gap therebetween; a striking unit comprising a striking block slidably sleeved on the guide rod and a striker attached to the striking block, the striking spring, when being compressed, driving the striking unit to move along a preset nailing direction to drive a fastener into a workpiece; and a drive unit comprising an electric motor and a lifting member actuated by the electric motor, the lifting member being actuated by the electric motor to drive the striking unit to move along a preset energy-storing direction such that the striking spring is compressed, the energy-storing direction being opposite the nailing direction; wherein a sleeve is further sleeved on the guide rod, and a slot adapted to fit with the sleeve is formed on the striking block, the sleeve has a limiting portion and a base portion which are axially distributed, an outer diameter D 1 of the limiting portion being smaller than an outer diameter D 2 of the base portion, an end portion of the striking spring being sleeved on an outer periphery of the limiting portion and abutting against the base portion, the sleeve being pressed by the striking spring into the slot, the end portion of the striking spring being also disposed in the slot.
2 . The spring-loaded nail gun according to claim 1 , wherein the limiting portion has an axial height H ranging from 7 mm to 15 mm.
3 . The spring-loaded nail gun according to claim 1 , wherein the slot has an inner diameter D 3 , and the striking spring has an inner diameter d 1 and an outer diameter d 2 , where D 1 □d 1 □d 2 ≤D 2 ≤D 3 .
4 . The spring-loaded nail gun according to claim 1 , wherein an elastic pad is provided on the base portion, the end portion of the striking spring abutting against the elastic pad.
5 . The spring-loaded nail gun according to claim 1 , wherein the striking spring is configured to include a small-diameter spring and a large-diameter spring which are nested one inside the other with a gap therebetween; the limiting portion includes a first limiting portion corresponding to the small-diameter spring and a second limiting portion corresponding to the large-diameter spring; the first limiting portion is thinner than the second limiting portion so that a stepped surface is formed therebetween; an end portion of the small-diameter spring is sleeved on an outer periphery of the first limiting portion and abuts against the stepped surface, and an end portion of the large-diameter spring is sleeved on an outer periphery of the second limiting portion and abuts against the base portion.
6 . The spring-loaded nail gun according to claim 5 , wherein the elastic pad is provided on the stepped surface and the base portion, respectively.
7 . The spring-loaded nail gun according to claim 4 , wherein the elastic pad has a thickness T ranging from 1 mm to 4 mm.
8 . The spring-loaded nail gun according to claim 1 , wherein at least one notch is provided in a circumferential direction of the slot.
9 . The spring-loaded nail gun according to claim 1 , wherein the lifting member comprises a lifting wheel and a drive pin arranged on the lifting wheel; a transmission surface adapted to fit with the drive pin is provided on the striking block; the lifting wheel, when rotating, drives, via abutment between the drive pin and the transmission surface, the striking unit to move along the preset energy-storing direction; and a minimum distance L between the transmission surface and a central axis of the guide rod is greater than a radius of the striking spring.
10 . The spring-loaded nail gun according to claim 9 , wherein the striking block is provided with a thickened portion protruding toward the lifting wheel, and the transmission surface is arranged on the thickened portion.
11 . The spring-loaded nail gun according to claim 6 , wherein the elastic pad has a thickness T ranging from 1 mm to 4 mm.

Description

FIELD The present application relates to a power tool, and more particularly relates to a spring-loaded nail gun. BACKGROUND Nail guns are common nail driving tools. An existing spring-loaded nail gun generally includes a guide rod, a spring, a striking block, a striker, and a power structure, the spring being sleeved over the guide rod, one end of the spring being positionally fixed and an opposite end thereof abutting against the striking block, the striking block being slidably sleeved on the guide rod, the striker being attached to the striking block, the power structure driving the striking block and the striker to move towards the compressed spring so that the spring is compressed to store energy. When the striking block is released, the spring is relaxed, and the compressed spring drives the striking block and the striker to move rapidly along the guide rod towards a nail, while the rapidly moving striker drives the nail into a workpiece. In the existing spring-loaded nail gun, one end of the spring directly abuts against the striking block. As the inner diameter of the spring is greater than the outer diameter of the guide rod, the spring is prone to radial displacement, likely causing deformation of the spring over prolonged operation; this may undermine structural stability and performance reliability of the spring and thus cannot guarantee the effect of nail driving. SUMMARY To overcome the above drawbacks and disadvantages in conventional technologies, the present disclosure provides a spring-loaded nail gun, which enhances structural stability of an end portion of a striking spring by bidirectionally and axially limiting the end portion of the striking spring via a limiting portion and a circumferential inner wall of a slot, thereby preventing the end portion of the striking spring from being deformed over prolonged operation. A spring-loaded nail gun according to the present disclosure comprises: a guide rod;a striking spring sleeved over the guide rod with a gap therebetween;a striking unit comprising a striking block slidably sleeved on the guide rod and a striker attached to the striking block, the striking spring, when being compressed, driving the striking unit to move along a preset nailing direction to drive a fastener into a workpiece; anda drive unit comprising an electric motor and a lifting member actuated by the electric motor, the lifting member being actuated by the electric motor to drive the striking unit to move along a preset energy-storing direction such that the striking spring is compressed, the energy-storing direction being opposite the nailing direction;wherein a sleeve is further sleeved on the guide rod, and a slot adapted to fit with the sleeve is formed on the striking block, the sleeve has a limiting portion and a base portion which are axially distributed, an outer diameter D1 of the limiting portion being smaller than an outer diameter D2 of the base portion, an end portion of the striking spring being sleeved on an outer periphery of the limiting portion and abutting against the base portion, the sleeve being pressed by the striking spring into the slot, the end portion of the striking spring being also disposed in the slot. In some implementations, the limiting portion has an axial height H ranging from 7 mm to 15 mm. In some implementations, the slot has an inner diameter D3, and the striking spring has an inner diameter d1 and an outer diameter d2, where D1□d1□d2≤D2≤D3. In some implementations, an elastic pad is provided on the base portion, the end portion of the striking spring abutting against the elastic pad. In some implementations, the striking spring is configured to include a small-diameter spring and a large-diameter spring which are nested one inside the other with a gap therebetween; the limiting portion includes a first limiting portion corresponding to the small-diameter spring and a second limiting portion corresponding to the large-diameter spring; the first limiting portion is thinner than the second limiting portion so that a stepped surface is formed therebetween; an end portion of the small-diameter spring is sleeved on an outer periphery of the first limiting portion and abuts against the stepped surface, and an end portion of the large-diameter spring is sleeved on an outer periphery of the second limiting portion and abuts against the base portion. In some implementations, the elastic pad is provided on the stepped surface and the base portion, respectively. In some implementations, the elastic pad has a thickness T ranging from 1 mm to 4 mm. In some implementations, at least one notch is provided in a circumferential direction of the slot. In some implementations, the lifting member comprises a lifting wheel and a drive pin arranged on the lifting wheel; a transmission surface adapted to fit with the drive pin is provided on the striking block; the lifting wheel, when rotating, drives, via abutment between the drive pin and the transmis