TW201334927A - Firing pin assembly of nail gun - Google Patents

Abstract

This invention relates to a firing pin assembly of a nail gun mainly comprising a firing pin and a protective cover having a hardness greater than that of the firing pin. The firing pin has a body part and a head part integrally extended from the front end of the body part. The outer diameter of the body part is less than that of the body part. The protective cover is tightly fitted and sleeved on the head part of the firing pin, and the front end of the protective cover and the end face of the head part of the firing pin together define a nail striking face. Therefore, by combining two materials of different hardness, the firing pin assembly of this invention is able to improve the problems of uneven wearing and breakage.

Description

Nail gun striker assembly

The invention relates to a striker of a nail gun, in particular to a striker assembly with high reliability and durability.

At present, the power type nail gun has been widely used in decoration or home DIY. It uses a striker in the nozzle to perform nailing action, and can continuously fire many nails in the nail; however, in the use of the striker continuously During the impact of the nail body, the impact force will inevitably cause the impact pin to wear. Since the current striker is a single material, and during the impact process, the periphery of the striker face of the striker usually comes into contact with the nail body first. The impact force on the periphery of the nail surface is greater than the impact force on the center of the nail surface. Therefore, after a period of use, the nail surface of the striker is prone to deformation and wear unevenness.

In order to improve the wear problem, a high-hardness material is generally used to make the striker. This method makes the striker become brittle and easily breaks and breaks. However, if a low-hardness material is used to make the striker, the wear problem cannot be effectively solved. Uneven wear can even cause deformation of the striker. Therefore, some manufacturers use welding or welding to additionally provide a high-hardness material different from the material of the striker at the front end of the striker in an attempt to solve the wear problem, such as the Taiwan Patent No. M381495 and the Japanese Patent No. 2001328077. However, the joints of the different materials are prone to deformation or cracking after a long period of attack, which causes the high-hardness material to fall off.

In view of the above-mentioned deficiencies, the main object of the present invention is to provide a striker assembly for a nail gun, which can simultaneously improve the condition of uneven wear and breakage, thereby achieving high reliability and durability.

In order to achieve the above object, the striker assembly of the present invention comprises a striker and a sheath, the material of which is harder than the hardness of the striker. The striker has a body portion and a head portion extending integrally from the body portion and forming an end surface, and the outer diameter of the head portion is smaller than the outer diameter of the body portion; the sheath is hollow tubular and tight The grounding sleeve is sleeved on the head of the striker and is formed with a front end surface to form a nail surface together with the end surface of the head of the striker, and the length of the head is slightly longer than the length of the sheath.

Wherein the length of the sheath is slightly shorter than the head of the striker, the purpose is to allow the striker assembly to retreat to the front end face of the body as the strike process progresses during the strike, and the head The front end surface will protrude from the sheath, and after being deformed by force, it will be radially extended to cover the sheath, so that the sheath is not easily peeled off.

With a combination of two different hardness materials, the harder sheath can effectively reduce the wear problem, while the softer striker can avoid the broken condition, and the sheath bundle can avoid the deformation of the striker head. happened.

Preferably, in the striker assembly provided by the present invention, the striker is made of steel having a hardness value between Rockwell hardness 48 and Rockwell hardness of 58, and the sheath is determined by the hardness value. Made of steel with a hardness of 55 to a Rockwell hardness of 65.

For a detailed description of the structure, features, and advantages of the present invention, a preferred embodiment is illustrated and described in conjunction with the following drawings.

Referring to the first figure, a striker assembly 10 for a nail gun according to a preferred embodiment of the present invention includes a striker 20 and a sheath 30.

The striker 20 is made of steel having a hardness value between Rockwell hardness 48 and Rockwell hardness of 58. The striker 20 has a body portion 21 and a head portion 23, and the body portion 21 is formed with a front end surface 22 extending integrally from the front end surface 22 of the body portion 21, and the outer diameter of the head portion 23 is smaller than The outer diameter of the body portion 21, the length of the head portion 23 is L1, as shown in the second figure.

The sheath 30 is in the form of a hollow tubular or hollow ring in the present embodiment. The sheath 30 has a length L2. The sheath has a front end surface 32 formed at one end and a rear end surface 33 formed at the opposite end. The sheath has a hardness value. Made of steel with a Rockwell hardness of 55 to a Rockwell hardness of 65. Therefore, the sheath 30 can be tightly sleeved on the head 23 of the striker 20 such that the front end face 32 of the sheath 30 and the end face 24 of the head 23 of the striker 20 together form a nail face 12, as shown in the second figure. As shown in the present embodiment, the nail surface 12 is a flat surface, but not limited thereto. The curved surface or the step surface or the like can be applied to the design of the firing nail body (not shown).

Incidentally, when the sheath 30 is sleeved on the head 23 of the striker 20, the rear end surface 33 of the sheath 30 and the front end surface 22 of the body portion 21 of the striker 20 have a gap, that is, the head The length L1 of 23 is slightly longer than the length L2 of the sheath 30.

Initially, when the striker assembly 10 is used for the firing operation, since the impact force received by the front end face 32 of the sheath 30 is greater than the impact force received by the end face 24 of the head 22 of the striker 20, the sheath 30 is Since the material has a high hardness, the sheath 30 can effectively avoid the problem of deformation and abrasion, and the material of the striker 20 is low in hardness, so that the toughness is better and the striker 20 can be prevented from being broken. Therefore, the striker of the present invention Assembly 20 has better reliability and durability.

In addition, after a period of use, the sheath 30 is gradually moved by force to stop the rear end surface 33 of the front end surface 22 of the body portion 21, and the impact force is evenly distributed in a face-to-face manner. The front end face 22. At the same time, although the end face 24 of the striker 20 will be slightly convex, it will also have a radially extending deformation due to the impact to cover the front end face 32 of the sheath 30, as shown in the third figure, at this time the sheath The 30 is blocked by the deformed end face 24 of the striker 20 and is not easily detached from the head 23 of the striker 20.

Incidentally, the sheath of the present invention is designed to fit the cylindrical shape of the striker body and the head, and is designed to have a hollow tube of equal wall thickness. In the case where the body and the head structure of the striker are different from the foregoing embodiment, A person skilled in the art can similarly set the sheath to the striker head, and the front end surface of the sheath and the head end surface of the striker together form a nail surface. This variation design is also the present invention. The scope of protection claimed.

In summary, the striker assembly 10 of the present invention utilizes a combination of two different hardness materials to solve the problem of the conventional striker in use to achieve the main purpose of improving wear unevenness and avoiding breakage, and is also capable of oil pressure during assembly. A table or other mechanical device to quickly complete the tight fit of the sheath 30 for assembly and cost reduction.

10. . . Needle assembly

12. . . Nail surface

20. . . firing pin

twenty one. . . Body

twenty two. . . Front end face

twenty three. . . head

twenty four. . . End face

30. . . jacket

32. . . Front end face

33. . . Rear end face

The first figure is a plan exploded view of a preferred embodiment of the invention.

The second figure is a partial cross-sectional view of a preferred embodiment of the present invention prior to impact.

Figure 3 is a partial cross-sectional view of the preferred embodiment of the present invention after impact.

10. . . Needle assembly

20. . . firing pin

twenty one. . . Body

twenty three. . . head

30. . . jacket

Claims (6)

A striker assembly for a nail gun includes: a striker having a body and a head, the head extending integrally from the body and forming an end face, and the outer diameter of the head is smaller than the body An outer diameter; and a sheath formed of a hollow tubular shape having a hardness greater than that of the striker and formed with a front end surface, the sheath being tightly fitted over the head of the striker, wherein the length of the head Slightly longer than the length of the sheath, the sheath forms a nailing surface with its front end face and the end face of the head. The striker assembly of the nail gun of claim 1, wherein the striker is made of steel having a hardness value between Rockwell hardness 48 and Rockwell hardness of 58. A striker assembly for a nail gun according to claim 1, wherein the sheath is made of a steel material having a hardness value between Rockwell hardness 55 and Rockwell hardness 65. A striker assembly for a nail gun according to claim 1, wherein the body portion is formed with a front end surface that integrally extends from the front end surface of the body portion. The striker assembly of the nail gun according to claim 1, wherein the front end surface of the sheath forms a rear end surface opposite to the other end, and the sheath is sleeved on the head of the striker, the rear end surface of the sheath and the body There is a gap in the front end of the part. The striker assembly of the nail gun of claim 5, wherein the sheath is forced to move such that the rear end faces the front end face of the body.