TWM470730U - Rivet gun with cushioning structure - Google Patents

Description

Stud gun with cushioning structure

The present invention relates to a rivet gun with a cushioning structure that provides a cushioning function to the piston assembly inside the air cylinder, reduces vibration, and keeps the piston moving smoothly.

Please refer to the Taiwan Patent No. M400369 new patent case. The rivet gun is suitable for riveting rivets on two plates to fix the two plates with rivets. The rivet usually includes a cap portion and a core stud that is disposed over the cap portion and longer than the cap portion.

A rivet gun typically includes a barrel, a grip, a trigger, a gas cylinder, and a piston assembly.

The inside of the barrel has a front and rear sliding rivet assembly, the grip is vertically formed under the barrel and has a gas passage therein, the trigger is disposed on the grip and connected to the gas passage, the air cylinder is disposed at the bottom end of the grip, and the rivet The components are connected to hydraulically drive the rivet assembly. In addition, the gas cylinder can be externally connected with a high-pressure gas source to inject high-pressure gas into the barrel for nailing. The piston assembly is disposed in the air cylinder in a vertically slidable manner, and has a piston rod and a piston head disposed at a lower end of the piston rod. A uniform hole is formed in the piston head for passage through a through pipe which is connected to the lower end of the grip.

When riveting the rivet with a rivet gun, first pass the rivet through the two plates, and then pull the trigger, the rivet gun with the front end of the barrel against the rivet cap. And the rivet assembly clamps the nail head of the core nail, pulls the nail head toward the tail end of the barrel, and the barrel squeezes the nail cap to deform the nail cap into a T shape, thereby fixing the rivet to the plate body, and simultaneously The high-pressure gas of the high-pressure gas source flows through the inside of the barrel, and generates a rear suction force to discharge a broken core nail from the tail end of the barrel.

The piston head of the existing rivet gun piston assembly is a disk body that hermetically contacts the inner wall of the gas cylinder to distinguish the inner space of the gas cylinder into an upper air chamber and a lower air chamber. However, the piston head is solid, and the gas in the lower air chamber or the upper air chamber in the air cylinder cannot pass through the piston head to the upper air chamber or the lower air chamber. Therefore, when the trigger is pressed to pull the nail, the lower air chamber enters the high pressure. When the air moves the piston head upwards, the piston head suddenly suffers from excessive thrust, which causes vibration and abnormal sound. On the contrary, when the piston head is moved downward after the pulling operation is completed, the piston head cannot move to the bottom of the air cylinder quickly because there is still residual air in the lower air chamber.

The creator has created a stylus gun with a cushioning structure in view of the disadvantages of the movement resistance of the piston head of the conventional rivet gun and the impact of the gas cylinder, improving the deficiency and lack thereof.

The main purpose of this creation is to provide a stylus gun with a cushioning structure that provides a cushioning function to the piston assembly inside the cylinder, reduces vibration, and keeps the piston moving smoothly.

In order to achieve the above object, the rivet gun with the cushioning structure includes: a barrel having a rivet assembly disposed therein; a grip extending downward from the barrel, and a grip is disposed on the grip a trigger assembly to drive the rivet assembly, forming a recess in the grip a hydraulic pipe is disposed in the accommodating space to form a liquid passage in the hydraulic pipe; a gas cylinder is fixed at the bottom of the hydraulic pipe, and a gas chamber is formed in the gas cylinder; a piston assembly is disposed in the gas cylinder, and The utility model has a piston rod and a piston head, wherein the piston rod is slidably arranged in a liquid passage of the hydraulic pipe, the piston head is in the shape of a disk, is arranged at the bottom end of the piston rod, and contacts the air chamber of the gas cylinder in a gastight manner. An inner wall, and dividing the air chamber into an upper space and a lower space, wherein at least one assembly hole is formed in the piston head; and at least one buffer device is disposed in the corresponding assembly hole, and has a casing, a valve stem and a a buffer spring having a through hole formed in the axial direction of the outer casing, and a through hole extending through the outer casing to form at least one lateral hole communicating with the through hole, the through hole having a valve opening, the valve stem being slidably disposed in the through hole Forming a valve portion radially outwardly from the bottom end of the valve stem, and selectively closing the perforated valve opening, the buffer spring is sleeved on the valve stem, one end of which abuts against the inner wall of the perforation, and the other end Relying the valve portion, the valve portion opens the valve opening in a preset state; wherein, when the lower space is filled with high pressure gas and the piston head moves upward in the air chamber, the high pressure gas pushes up the buffer valve stem and compresses the buffer spring, and The valve portion closes the outer casing valve opening; when the piston head moves downward in the air chamber, the valve stem of the shock absorber moves downward, so that the valve portion opens the valve opening and releases the buffer spring, and allows the upper space and the lower space to communicate with each other.

With the above technical means, this creation has the following advantages:

1. When the piston head moves upward, the high pressure gas in the lower space must first compress the buffer spring and close the valve opening to further push up. The plug head, the buffer spring absorbs part of the impulse of the high pressure gas, so it can slow down the vibration caused by the high pressure gas directly impacting the piston.

2. When the piston head moves downward in the air chamber, the outer casing valve opens and releases the buffer spring, and the upper space and the lower space communicate with each other, and the gas can freely enter the upper space or the lower space, thereby improving the smoothness of the movement of the piston head.

The gas cylinder has a cylinder body, an upper cover and a base, the cylinder body has an upper opening and a lower opening communicating with the air chamber, the upper cover is fixed at the upper opening and is disposed at a lower end of the hydraulic pipe, the base is fixed at the lower opening; When the head moves to the bottom of the air chamber of the air cylinder, the valve portion of the cushioning device abuts against the base.

The bottom of the grip is provided with a communication tube extending into the air cylinder; a communication hole is formed in the piston head for the passage of the communication tube.

A valve groove is formed on the valve portion of the valve stem of the buffer device in the radial direction, and a valve sealing ring is disposed in the ring groove to hermetically contact the perforated valve opening.

The valve portion has a small diameter flange and a large diameter flange. The diameter of the small diameter flange is smaller than the diameter of the perforation, and the diameter of the large diameter flange is larger than the diameter of the perforation. The annular groove is located between the small diameter flange and the large diameter flange.

A ring groove is formed in the piston head in the radial direction, and a hermetic sealing ring is arranged in the ring groove to airtightly contact the inner wall of the air chamber.

The upper end of the valve stem is provided with a stopper outside the outer casing.

The assembly head of the foregoing piston head is two; the number of the buffer devices is two, and is disposed in the piston head in a radially symmetric manner.

The aforementioned rivet gun further has a ring fixing seat, and the ring fixing The seat protrudes outward from the bottom end of the grip and abuts against the upper cover of the air cylinder.

10‧‧‧ barrel

11‧‧‧ rivet assembly

20‧‧‧ grip

200‧‧‧ accommodating space

21‧‧‧Hydraulic pipe

22‧‧‧ Trigger assembly

25‧‧‧Connected pipe

30‧‧‧ring mount

40‧‧‧ gas cylinder

41‧‧‧Cylinder

410‧‧‧ air chamber

42‧‧‧上盖

4101‧‧‧Upper space

4102‧‧‧Under space

50‧‧‧ piston assembly

51‧‧‧ piston rod

52‧‧‧ piston head

520‧‧‧Circle

521‧‧‧Connected holes

522‧‧‧Assembled holes

525‧‧‧ airtight seal

60‧‧‧ buffer device

61‧‧‧Shell

6101‧‧‧ valve opening

63‧‧‧ valve stem

631‧‧‧foot trailing edge

633‧‧‧ Large diameter flange

634‧‧‧ Ring groove

64‧‧‧Valve seal

65‧‧‧buffer spring

66‧‧‧stops

Figure 1 is a three-dimensional appearance of the creation.

Fig. 2 is a perspective view showing the appearance of the cylinder omitted.

Figure 3 is an exploded perspective view of the present creation.

Figure 4 is a perspective exploded view of the piston assembly of the present invention.

Fig. 5 is an enlarged front elevational view showing the creation buffer device.

Figure 6 is a side cross-sectional view of the creation.

Figure 7 is a schematic diagram showing the enlarged operation of the front side of the present creation.

Fig. 8 is a schematic view showing the enlarged operation of the front side of the present invention.

Referring to FIG. 1 to FIG. 3 , the rivet gun of the present invention comprises: a barrel 10 , a grip 20 , a ring holder 30 , a gas cylinder 40 , a piston assembly 50 and two buffer devices 60 .

A rivet assembly 11 is disposed within the barrel 10.

Referring to FIG. 6 further, the grip 20 protrudes downward from the barrel 10, and a trigger assembly 22 is disposed on the grip 20 to drive the rivet assembly 11. An accommodating space 200 is formed in the grip 20 for receiving A hydraulic pipe 21 is disposed in the space 200, and a liquid passage 210 is formed in the hydraulic pipe 21. At the bottom of the grip 20 is provided a communication tube 25 that projects into the air cylinder 40.

The ring mount 30 projects outwardly from the bottom end of the grip 20.

The air cylinder 40 is fixed to the bottom of the hydraulic pipe 21 and abuts against the ring fixing seat, and an air chamber 410 is formed in the air cylinder 40. The air cylinder 40 further has a cylinder 41, an upper cover 42 and a base 43.

The cylinder 41 has an upper opening communicating with the air chamber 410 to And the lower opening.

The upper cover 42 is fixed to the opening of the cylinder 41, abuts against the ring fixing seat 30, and is disposed at the lower end of the hydraulic pipe 21. A fixing hole through which the lower end of the hydraulic pipe passes is formed in the upper cover 42, and a through hole 421 through which the communication pipe 25 passes is formed in the upper cover 42.

The base 43 is fixed to the lower opening of the cylinder 41.

4 to 6, the piston assembly 50 is disposed within the air cylinder 40 and has a piston rod 51 and a piston head 52.

The piston rod 51 is slidably disposed within the liquid passage 210 of the hydraulic pipe 21.

The piston head 52 has a disk shape, is disposed at the bottom end of the piston rod 51, and contacts the inner wall of the air chamber 410 of the air cylinder 40 in a gastight manner, and divides the air chamber 410 into an upper space 4101 and a lower space 4102 at the piston head. Two assembly holes 522 are formed through the 52. Further, a communication hole 521 is formed in the piston head 52 for the passage of the communication tube 25. Furthermore, the communication tube 25 can deliver high pressure air from an external high pressure gas source to the lower space 4102 of the air chamber 410. Further, a ring groove 520 is formed in the piston head 52 in the radial direction, and a hermetic sealing ring 525 is disposed in the ring groove 520 to hermetically contact the inner wall of the air chamber 410.

The two buffering devices 60 are respectively disposed in the assembly holes 522 of the piston head 52 in a radially symmetric manner, and each of the buffering devices 60 has a housing 61, a valve stem 63, a buffer spring 65 and a stopper 66.

A through hole 610 is formed in the outer casing 61 in the axial direction.

At least one lateral hole 615 communicating with the perforation 610 is formed in the outer casing 61 in a radial direction, the perforation 610 having a valve opening 6101.

The valve stem 63 is slidably disposed within the through hole 610. A valve portion is formed radially outwardly from the bottom end of the valve stem 63, and the valve opening 6101 of the through hole 610 is selectively closed. Further, a valve groove 634 is formed in the valve portion of the valve stem 63 in the radial direction, and a valve seal ring 64 is disposed in the ring groove 634 to hermetically contact the valve opening 6101 of the through hole 610. Furthermore, the valve portion has a small diameter flange 631 and a large diameter flange 633. The diameter of the small diameter flange 631 is smaller than the diameter of the through hole 610. The diameter of the large diameter flange 633 is larger than the diameter of the through hole 610. The annular groove 634 is located at the small diameter. Between the edge 631 and the large diameter flange 633.

The buffer spring 65 is sleeved on the valve stem 63, one end of which abuts against the inner wall of the through hole 610, and the other end abuts against the small diameter flange 631 of the valve portion, so that the valve portion opens the valve opening 6101 in a preset state.

The stopper 66 is C-shaped and is disposed at an upper end of the valve stem 63 and outside the outer casing 61.

Referring to FIG. 7 further, when the inner space 4102 is filled with high pressure gas and the piston head 52 is moved upward in the air chamber 410, the high pressure gas pushes up the valve stem 63 of the buffer device 60 and compresses the buffer spring 65, and causes the valve portion to close the outer casing. 61 valve opening 6101. Since the high pressure gas of the lower space 4102 must first compress the buffer spring 65 and close the valve opening 6101 to further push the piston head 52 upward, the high pressure gas does not suddenly impact the piston head 52, and the vibration generated by the high pressure gas directly impacting the piston can be alleviated.

Referring to FIG. 8 further, when the piston head 52 moves downward in the air chamber 410, the valve stem 63 of the shock absorber 60 moves downward, so that the valve portion opens the outer casing 61 valve opening 6101 and releases the buffer spring 65, and makes the upper space 4101 Interconnected with the lower space 4102, the gas can freely enter the upper space 4101 or the lower space 4102, thereby improving the smoothness of the movement of the piston head 52.

With the above technical means, this creation has the following advantages:

1. When the piston head 52 moves upward, the high pressure gas of the lower space 4102 must first compress the buffer spring 65 and close the valve opening 6101 to further push the piston head 52 upward. The buffer spring 65 absorbs part of the impulse of the high pressure gas, thereby slowing down the high pressure. The vibration generated by the gas directly impacting the piston.

2. When the piston head 52 moves downward in the air chamber 410, the outer casing 61 opens the valve 6101 and releases the buffer spring 65, and allows the upper space 4101 and the lower space 4102 to communicate with each other, and the gas can freely enter the upper space 4101 or the lower space 4102. The smoothness of the movement of the piston head 52 is improved.

10‧‧‧ barrel

20‧‧‧ grip

22‧‧‧ Trigger assembly

30‧‧‧ring mount

40‧‧‧ gas cylinder

Claims (10)

A rivet gun with a buffer structure comprises: a barrel, a rivet assembly is arranged in the barrel; a grip protrudes downward from the barrel, and a trigger assembly is arranged on the grip to drive the rivet The assembly has an accommodating space formed therein, a hydraulic pipe is disposed in the accommodating space, and a liquid passage is formed in the hydraulic pipe; a gas cylinder is fixed at the bottom of the hydraulic pipe, and a gas chamber is formed in the gas cylinder; The assembly is disposed in the air cylinder and has a piston rod and a piston head. The piston rod is slidably disposed in a liquid passage of the hydraulic pipe. The piston head is disc-shaped and disposed at the bottom end of the piston rod, and Airtightly contacting the inner wall of the air chamber of the air cylinder, and dividing the air chamber into an upper space and a lower space, at least one assembly hole is formed through the piston head; and at least one buffer device is disposed in the corresponding assembly hole, and The utility model has a casing, a valve stem and a buffer spring. The casing is axially formed with a through hole, and the casing is radially penetrated to form at least one lateral hole communicating with the perforation, the perforation having a valve a valve stem slidably disposed in the through hole, a valve portion protruding radially outwardly from the bottom end of the valve stem, and selectively closing the perforated valve opening, the buffer spring being sleeved on the valve stem One end abuts against the inner wall of the perforation, and the other end abuts against the valve portion, so that the valve portion opens the valve opening in a preset state; wherein, when the lower space is filled with high-pressure gas and the piston head moves upward in the air chamber, the high-pressure gas will buffer The valve stem of the device pushes up and compresses the buffer spring, and causes the valve portion to close the opening of the outer casing valve; when the piston head moves downward in the air chamber, the valve stem of the buffer device moves downward, so that the valve portion opens the valve opening And the buffer spring is released, and the upper space and the lower space are connected to each other. The rivet gun with a cushioning structure according to claim 1, wherein the air cylinder has a cylinder, an upper cover and a base, the cylinder has an upper opening communicating with the air chamber and a lower opening, the upper cover being fixed to the upper opening and It is disposed at the lower end of the hydraulic pipe, and the base is fixed to the lower opening; when the piston head moves to the bottom of the air chamber of the air cylinder, the valve portion of the buffer device abuts against the base. The rivet gun with a cushioning structure according to claim 2, wherein the bottom of the grip is provided with a communication tube extending into the air cylinder; a communication hole is formed in the piston head for the passage of the communication tube. The rivet gun with a cushioning structure according to claim 3, wherein a valve groove is formed in a radial direction on a valve portion of the valve stem of the buffer device, and a valve sealing ring is disposed in the annular groove for airtightly contacting the perforated valve opening. . The rivet gun with a buffer structure according to claim 4, wherein the valve portion has a small diameter flange and a large diameter flange, the diameter of the small diameter flange is smaller than the diameter of the perforation, and the diameter of the large diameter flange is larger than the diameter of the perforation, the ring The groove is located between the small diameter flange and the large diameter flange. A rivet gun having a cushioning structure according to any one of claims 1 to 5, wherein a ring groove is formed radially on the piston head, and a hermetic seal ring is disposed in the ring groove to hermetically contact the inner wall of the gas chamber. A rivet gun having a cushioning structure according to claim 6, wherein the upper end of the valve stem is provided with a stopper located outside the outer casing. The rivet gun with a cushioning structure according to claim 7, wherein the assembly head of the piston head is two; the number of the buffering devices is two, and is disposed in the piston head in a radially symmetric manner. The rivet gun with a buffer structure according to claim 1 further has a rivet gun A ring mount that protrudes outwardly from the bottom end of the grip and abuts against the upper cover of the air cylinder. The rivet gun with a cushioning structure according to claim 8, further comprising a ring fixing seat protruding outward from the bottom end of the grip and abutting against the upper cover of the air cylinder.