Striking pin

Abstract

The utility model relates to a firing pin, and belongs to the technical field of electric tools. A firing pin comprises a piston part, a lock sleeve and a pin rod, a through hole is formed in the piston part, threads are arranged on the outer surface of the lock sleeve, the lock sleeve enters the through hole to be in threaded connection with the piston part, a second step hole is formed in the center of the lock sleeve, and the pin rod is pressed into the second step hole and is in interference fit with the second step hole. According to the utility model, firing pin combination is realized, the heat treatment difficulty of firing pin integral forming is avoided, the cost is reduced, and the durability of the firing pin is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nail-shooting tools, in particular to a firing pin. Background Art

[0002] The existing firing pin structure is shown in patent CN115319694A. Figure 1 As shown in the figure, the firing pins currently sold and produced in the general market all adopt an integral structure, that is, the integral threaded section has a thicker diameter, the outer diameter of the fixed aluminum surface is 15-20mm, and the diameter of the thinner part is about 6.5. The disadvantages of such firing pins are high cost, unstable heat treatment, and easy breakage. Utility Model Content

[0003] The utility model aims to solve the problems existing in the prior art and to provide a firing pin which does not require stable heat treatment and reduces material waste through structural improvement.

[0004] In order to achieve the above-mentioned purpose, the basic technical scheme of the utility model striker is as follows: a striker comprises a piston part, a lock sleeve, and a needle rod, the piston part is provided with a through hole, the outer surface of the lock sleeve is provided with a thread, the lock sleeve enters the through hole and is threadedly connected with the piston part, a second step hole is provided at the center of the lock sleeve, the needle rod is pressed into the second step hole, and the needle rod is interference-connected with the second step hole

[0005] The through hole is a first step hole, which has a first diameter portion and a second diameter portion, wherein the first diameter portion has an internal thread, the diameter of the second diameter portion is larger than the diameter of the first diameter portion, the outer surface of the locking sleeve is threadedly connected to the first diameter portion, and a step protrusion is provided at the first end of the locking sleeve, the step protrusion is fitted with the second diameter portion, and the outer diameter of the step protrusion gradually decreases along the center line direction of the needle rod.

[0006] Furthermore, the step protrusion is provided with a horizontal surface and an inclined surface, and both the horizontal surface and the inclined surface are in contact with the second diameter portion.

[0007] Furthermore, the material of the lock sleeve is iron.

[0008] Furthermore, the material of the piston part is aluminum.

[0009] Furthermore, the material of the needle rod is aluminum, and the needle rod is a cylinder.

[0010] The beneficial effects of the utility model are:

[0011] 1. The piston, lock sleeve and needle bar are assembled to form the striker. The separate needle body is directly heat treated. The process is stable and does not require additional processing. Only the needle bar needs to be purchased directly, which reduces the processing difficulty and processing waste and saves costs. The piston is fixed by riveting and deforming the lock sleeve to prevent the lock sleeve from loosening and rotating after repeated reciprocating through the threaded connection, resulting in displacement.

[0012] 2. The locking sleeve is expanded by hot pressing at high temperature, and then returns to normal temperature and shrinks. The locking sleeve is deformed by interference fitting to firmly wrap the needle body, thereby improving the durability of the firing pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the firing pin structure in the prior art;

[0014] Figure 2 It is a schematic diagram of the firing pin structure of the utility model.

[0015] Explanation of reference numerals: striker 10 ; piston portion 11 ; lock sleeve 12 ; first step hole 121 ; first diameter portion 121 a ; second diameter portion 121 b ; second step hole 122 ; step protrusion 123 ; horizontal surface 123 a ; inclined surface 123 b ; needle rod 13 . DETAILED DESCRIPTION

[0016] Embodiment 1

[0017] The firing pin of this embodiment is as follows Figure 2 As shown, a firing pin 10 includes a piston part 11, a locking sleeve 12, and a needle rod 13. The piston part 11 is provided with a through hole, the outer surface of the locking sleeve 12 is provided with a thread, the locking sleeve 12 enters the through hole and is threadedly connected with the piston part 11, a second step hole 122 is provided at the center of the locking sleeve 12, the needle rod 13 is pressed into the second step hole 122, the needle rod 13 is interference connected with the locking sleeve 12, and the needle rod 13 is interference connected with the second step hole 122.

[0018] By changing the structure, the needle bar directly uses a 6.5mm round needle with a lock sleeve inside. The lock sleeve is screwed into the piston part through a threaded step structure, so that the thickness of the round needle of the striker is reduced. Otherwise, the existing technology requires the use of 15-20mm round rods to be machined to 6.5mm, which is labor intensive and causes waste. Now we can directly order 6.5mm round rod needles from steel mills, which directly perform heat treatment, with stable process, no processing required, and reduced processes and raw materials.

[0019] The piston part 11 fixes the locking sleeve 12 by riveting and deforming, so as to prevent the locking sleeve 12 connected by threads from loosening and rotating after being repeatedly reciprocated for a long time, thereby causing displacement of the locking sleeve.

[0020] The through hole is a first stepped hole 121, and the first stepped hole 121 has a first diameter portion 121a and a second diameter portion 121b, wherein the first diameter portion 121a has an internal thread, and the second diameter portion 121b is not provided with an internal thread, and the diameter of the second diameter portion 121b is larger than the diameter of the first diameter portion 121a, and the outer surface of the locking sleeve 12 is threadedly connected to the first diameter portion 121a, and the first end of the locking sleeve 12 is provided with a step protrusion 123, and the step protrusion is fitted with the second diameter portion 121b, the piston part 11 presses the locking sleeve 12, and the locking sleeve 12 presses the needle rod 13, the locking sleeve 12 and the needle rod 13 are pressed by interference fit, and the unheat-treated locking sleeve 12 is deformed by pressing to wrap the needle rod 13.

[0021] Part of the step protrusion 123 is in contact with the second diameter portion 121b. The outer diameter of the step protrusion 123 along the center line direction of the needle rod 13 gradually decreases. The step protrusion 123 has a horizontal surface 123a and an inclined surface 123b, and the diameter of the inclined surface 123b is smaller than the diameter of the horizontal surface 123a. The horizontal surface 123a and the inclined surface 123b are both in contact with the second diameter portion 121b, and the diameter of the horizontal surface 123a is larger than the diameter of the inclined surface 123b.

[0022] The material of the lock sleeve 12 is iron. The material of the piston portion 11 is aluminum. The material of the needle rod 13 is aluminum, and the needle rod 13 is a cylinder.

[0023] The principle of the utility model is:

[0024] The piston part 11, the locking sleeve 12, and the needle rod 13 are assembled to form the striker 10, so that the individual needle rod 13 can be directly heat treated, the process is stable, and no additional lathe processing is required, thereby reducing the processing difficulty and the rod material cost.

[0025] The locking sleeve 12 is expanded by heat pressing at high temperature, and then returns to normal temperature and contracts. The locking sleeve 12 is pressed by interference fitting to deform the needle body 13 and firmly wrap the needle body 13, thereby improving the durability of the striker.

[0026] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A firing pin, characterized in that: It includes a piston part, a locking sleeve, and a needle rod. The piston part is provided with a through hole, the outer surface of the locking sleeve is provided with a thread, the locking sleeve enters the through hole and is threadedly connected with the piston part, a second step hole is provided at the center of the locking sleeve, the needle rod is pressed into the second step hole, and the needle rod is interference connected with the second step hole; The through hole is a first step hole, which has a first diameter portion and a second diameter portion, wherein the first diameter portion has an internal thread, the diameter of the second diameter portion is larger than the diameter of the first diameter portion, the outer surface of the locking sleeve is threadedly connected to the first diameter portion, and a step protrusion is provided at the first end of the locking sleeve, the step protrusion is fitted with the second diameter portion, and the outer diameter of the step protrusion gradually decreases along the center line direction of the needle rod.

2. The firing pin according to claim 1, characterized in that: The step protrusion is provided with a horizontal surface and an inclined surface, and both the horizontal surface and the inclined surface are in contact with the second diameter portion.

3. The firing pin according to claim 2, characterized in that: The material of the lock sleeve is iron.

4. The firing pin according to claim 3, characterized in that: The piston part is made of aluminum.

5. The firing pin according to claim 4, characterized in that: The material of the needle rod is aluminum, and the needle rod is a cylinder.

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