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 firing pin of the utility model is: a firing pin, including 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 in 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.

[0005] Furthermore, the outer diameter of the needle rod is greater than the inner diameter of the second step hole.

[0006] Furthermore, the through hole is a first stepped hole, the first stepped hole 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, the first end of the locking sleeve is provided with a step protrusion, the step protrusion is fitted with the second diameter portion, the iron rod is provided with a step, and the step is located in the second diameter portion.

[0007] Furthermore, the needle rod has a first diameter section and a second diameter section, wherein the diameter of the second diameter section is larger than the diameter of the first diameter section, and a step is formed between the second diameter section and the first diameter section.

[0008] Further, the step is located in the second step hole.

[0009] Further, the diameter of the second diameter section is larger than the inner diameter of the second step hole.

[0010] Furthermore, the material of the lock sleeve is iron.

[0011] Furthermore, the piston part is made of aluminum, the needle rod is made of aluminum, the needle rod is a cylinder, and the stepped raised portion fits with the second diameter portion.

[0012] Furthermore, the step protrusion has a fitting portion and a mounting portion, wherein the fitting portion fits with the second diameter portion, and the mounting portion does not fit with the second diameter portion, and an arc transition is provided between the fitting portion and the mounting portion, and the arc transition is at the same position as the step.

[0013] The beneficial effects of the utility model are:

[0014] 1. The piston part, lock sleeve, and needle rod 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 rod needs to be purchased directly, which reduces the processing difficulty and processing waste and saves costs. A step protrusion is set at the first end of the lock sleeve. The piston part fixes the lock sleeve by riveting and deformation to prevent the lock sleeve connected by the thread from loosening and rotating after repeated reciprocating for a long time, causing the lock sleeve to move.

[0015] 2. The needle bar is provided with a step, and the locking sleeve is not heat treated. The step at the needle bar is wrapped by the deformation of the locking sleeve, and the locking sleeve is deformed by interference fitting. The locking sleeve wraps the needle body, thereby improving the durability of the striker and preventing the risk of the needle bar coming out after the striker hits for a long time.

[0016] 3. The step protrusion is provided with an arc transition, and the arc transition is at the same position as the step to prevent stress concentration caused by the deformation of the lock sleeve and wrapping the needle rod, so that stress deformation will not occur and the durability of the striker will be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the firing pin structure in the prior art;

[0018] Figure 2 It is a schematic diagram of the firing pin structure of the utility model.

[0019] Figure 3 It is a structural schematic diagram of the step of the utility model.

[0020] Explanation of the reference numerals: striker 10; piston portion 11; locking sleeve 12; first step hole 121; first diameter portion 121a; second diameter portion 121b; second step hole 122; step protrusion 123; fitting portion 123a; mounting portion 123b; needle rod 13; first diameter section 131; second diameter section 132; step 133. DETAILED DESCRIPTION

[0021] Embodiment 1

[0022] The firing pin of this embodiment is as follows Figure 2As 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.

[0023] 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 lock sleeve 12 is threadedly connected with the first diameter portion 121a, and the first end of the lock sleeve 12 is provided with a stepped protrusion 123, which fits the second diameter portion 121b, and the piston portion 11 presses the lock sleeve 12. In this way, a part of the piston portion 11 fixes the lock sleeve 12 through riveting deformation, and prevents the lock sleeve 12 from loosening and rotating after repeated reciprocation, resulting in displacement. Through structural changes, the needle bar 13 directly uses a 6.5mm round needle with a lock sleeve inserted inside, and the lock sleeve is screwed into the piston part through a threaded step structure. The advantage of this approach is that the thickness of the round needle of the striker can be reduced. Otherwise, in the prior art, a 15-20mm round bar must be machined to 6.5mm, which requires a lot of processing work and causes waste. Now, 6.5mm round bar needles are directly ordered from steel mills, and the steel mills directly perform heat treatment, which has a stable process and does not require processing, reducing processes and raw materials.

[0024] like Figure 3 As shown, the needle rod 13 is provided with a step 133, and the outer diameter of the needle rod 13 is larger than the inner diameter of the second step hole 122. The needle rod 13 has a first diameter section 131 and a second diameter section 132, wherein the diameter of the second diameter section 132 is larger than the diameter of the first diameter section 131, and a step 133 is formed between the second diameter section 132 and the first diameter section 131.

[0025] The step 133 is located in the second step hole 122. The diameter of the second diameter section 132 is larger than the inner diameter of the second step hole 122. In this way, the locking sleeve 12 and the needle rod 13 are press-fitted by interference fit, which is conducive to the locking sleeve 12 that has not been heat-treated to be deformed by press-fitting to wrap the step 133 of the needle rod 13, thereby preventing the risk of the needle rod 13 coming out after the striker strikes for too long.

[0026] Part of the step protrusion 123 is in contact with the second diameter portion 121b. The step protrusion 123 has a contact portion 123a and a mounting portion 123b, and the diameter of the mounting portion 123b is smaller than the diameter of the contact portion 123a. The contact portion 123a is in contact with the second diameter portion 121b, and the mounting portion 123b is not in contact with the second diameter portion 121b. A circular arc transition is provided between the contact portion 123a and the mounting portion 123b, and the circular arc transition is at the same position as the step 133. The stress concentration caused by the deformation of the lock sleeve 12 to wrap around the needle rod 13 is prevented, so that stress deformation does not occur, the durability of the striker is improved, and it is ensured that the needle rod 13 will not loosen when the fatigue limit is reached.

[0027] 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.

[0028] The principle of the utility model is:

[0029] 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.

[0030] A step protrusion 123 is provided at the first end of the lock sleeve 12 , and a step 133 is provided at the needle rod 13 . The lock sleeve 12 which has not been heat-treated is pressed and deformed to wrap around the needle rod 13 , thereby improving the durability of the striker 10 .

[0031] The step protrusion 123 is provided with an arc transition, and the arc transition and the step 133 are at the same position in the center line direction of the needle rod 13, so as to prevent stress concentration caused by the locking sleeve 12 deforming and wrapping the needle rod 13, so that stress deformation will not occur, thereby improving the durability of the striker.

[0032] 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 to 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, the needle rod and the second step hole are interference connected, the outer diameter of the needle rod is larger than the inner diameter of the second step hole, the through hole is a first step hole, the first step hole has a first diameter part and a second diameter part, wherein the first diameter part has an internal thread, and the diameter of the second diameter part is larger than the diameter of the first diameter part, the outer surface of the locking sleeve is threadedly connected to the first diameter part, the first end of the locking sleeve is provided with a step protrusion, the step protrusion is fitted with the second diameter part, the needle rod is provided with a step, and the step is located in the second diameter part.

2. The firing pin according to claim 1, characterized in that: The needle rod has a first diameter section and a second diameter section, wherein the diameter of the second diameter section is larger than the diameter of the first diameter section, and a step is formed between the second diameter section and the first diameter section.

3. The firing pin according to claim 2, characterized in that: The step is located in the second step hole.

4. The firing pin according to claim 3, characterized in that: The diameter of the second diameter section is greater than the inner diameter of the second stepped hole.

5. The firing pin according to claim 4, characterized in that: The material of the lock sleeve is iron.

6. The firing pin according to claim 5, characterized in that: The piston part is made of aluminum, the needle rod is made of aluminum, the needle rod is a cylinder, and the stepped raised part is fitted with the second diameter part.

7. The firing pin according to claim 6, characterized in that: The step protrusion has a fitting portion and a mounting portion, wherein the fitting portion fits with the second diameter portion, and the mounting portion does not fit with the second diameter portion, and an arc transition is provided between the fitting portion and the mounting portion, and the arc transition is at the same position as the step.

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