JPS59124580A - Impact moving tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention This invention uses hydraulic pressure and pressure generated by compression of gas such as air or nitrogen gas to cause a piston to advance and retreat, thereby striking a tool such as a chisel. is determined by hydraulic pressure, and the upward movement of the piston due to this hydraulic pressure compresses the gas, and its restoring force causes the piston to descend.The striking force of the piston is increased by utilizing the quickness of operation, which is a characteristic of gas. The present invention relates to an improvement of an impact power tool which eliminates the need for a compressor like a conventional air power tool by making the circuit a closed circuit so that only a small amount of gas leaks from the circuit.

Such known impact power tools have the above-mentioned excellent features, but when the hammer is lowered (
Since the royal chamber in the cylinder communicates with the oil drain port, the oil pressure in the lower chamber drops rapidly, causing cavitation near the connection between the royal chamber and the oil passage that communicates with it, causing noise and vibration, and in severe cases, causing damage. There were problems such as the generation of

The present invention solves the problems of the known impact power tools as described above, and prevents a sudden drop in the oil pressure in the lower chamber even when the piston enters its downward stroke.

That is, the structure of the present invention is such that a tool such as a chisel is attached to the lower end of the cylinder so that it can move forward and backward, and a piston that hits the tool when descending is fitted inside the cylinder. [II] A lower chamber for applying oil pressure and a middle chamber for storing oil above the large diameter part are provided, and an upper chamber for applying gas pressure from the upper end of the piston is also provided at the upper part of the cylinder. A circumferential groove is provided on the outer periphery of the diameter part, and the automatic switching valve has two oil fill ports and an oil drain port.In the lowered position, the lower chamber in the cylinder communicates with the oil fill port, and the middle chamber communicates with the oil drain port. In the raised position, a valve chamber is provided with a valve body whose lower chamber communicates with the oil supply port and whose middle chamber communicates with the fuel supply port, and an elevating rod is provided above the valve chamber to push down the valve body by hydraulic pressure applied from the fuel supply port. Furthermore, between the switching valve and the cylinder, there is an oil passage that passes through the circumferential groove and the oil drain port of the large diameter part of the piston when the piston is in the lower position, and is blocked by the large diameter part when the piston is in the upper position. When the piston is in the lowered position, it communicates with the oil passage through the circumferential groove of its large diameter part, and when the piston moves up, the lower chamber in the cylinder and the valve chamber on the lower surface of the flange at the upper end of the valve body communicate with each other. By applying hydraulic pressure to the bottom surface, we installed an oil passage that pushes the valve body up against the pushing force of the lifting rod, so that even if the piston runs out of oxygen when descending, the lower chamber in the cylinder will not communicate with the oil drain port. This is how it was done.

The details of the present invention will be explained below based on an embodiment shown in the accompanying drawings.

In N-2, 1 is a cylinder, 2 is a piston fitted inside the cylinder, and a large diameter portion 3 is integrally formed on the outer periphery of the cylinder. The inner side G of the cylinder 1 forms a lower chamber 4 which is the lower part of the large diameter part 3, and the upper part of the large diameter part 3 (which forms the middle chamber 5,
An upper chamber 6 is formed above the piston 2. First, make sure that the lower end of the cylinder 1 allows the chisel 7 to slide within a certain range so that the upper end of the chisel 7 is struck by the lower end of the piston 2 that has been fitted and descended. As mentioned above, a circumferential groove 8 is provided on the outer periphery of the large diameter portion 3.

9 is the valve box of the variable switching valve A installed on one side of the cylinder 1;
A valve body 10 that can be raised and lowered is provided in the valve chamber 11 of the valve box, and the inner periphery of the valve chamber 11 is provided with three stages of upper, middle, and lower projecting edges 12, 13, and 14, and the outer periphery of the upper end of the valve body 10 is A flange 16 is provided on the upper side of the flange 12, and a circumferential groove 15 is provided on the outer periphery of the intermediate portion of the valve body 10. A communicating hole 18 whose lower end opening is blocked at the bottom of the valve chamber 11 at this position, and a hole 19 communicating this communicating hole with the valve chamber 11 below the flange 14 are provided.

Reference numeral 20 designates two T protrusions that protrude downward from the upper end of the valve chamber 11, and a lifting rod 21 that contacts the upper end of the valve body 10 is fitted into the hole in the center. Said tsuba 16
is smaller than the downward area of .

22 is an oil passage that communicates the valve chamber 11 between the lower chamber 4 of the cylinder 1 and the flange 12, 13, 23 is the middle chamber 5 and the flange 13,
An oil passage 24 communicates the valve chamber 11 between the circumferential groove 8 of the large diameter portion 3 of the piston 2 in the lowered position and the lower flange 1 of the valve chamber 11.
An oil passage 25 communicates with the upper part of the circumferential groove 8 in the lowered position and the oil drain port 30.

Reference numeral 26 communicates with the valve chamber 11 between the projecting edges 12 and 13, the pressurizing chamber 27 on the lifting rod 21, and the pressure accumulating chamber 29 having the diaphragm 28 through an oil supply port provided in the valve box 9. 30 is an oil drain port that communicates with the upper part of the valve chamber 11 and the oil passage 25"□.

3. Although not shown, the upper chamber 6 is filled with compressed air or gas, and a check valve is installed in the upper part of the upper chamber 6 to prevent the waste in the upper chamber 6 from escaping. The chamber above the diaphragm is also filled with gas at a constant pressure.

This invention has the above configuration. In FIG. 1, the piston 2 is at the lowest position, and the valve body 10 is also at the lowest position, and at this time, the lower end opening of the valve body 10 is in close contact with the bottom of the valve chamber 11 and closed. When pressure oil at a predetermined pressure is supplied to the oil filler port 26 in this state, this pressure oil flows from the oil filler port 26 to the valve chamber 11 between the flange 12 and 13 to the oil passage η to the lower chamber 4 and into the large diameter portion 3. When hydraulic pressure is applied to the lower surface, the oil in the middle chamber 5 flows from the oil passage 23 → the valve chamber 11 below the flange 13 → the hole 19 of the valve body 10 → the communication hole 18 → the upper part of the valve chamber 11 → the oil drain port 30. Since the gas is discharged, the piston 2 rises while compressing the gas in the royal chamber 6.

At this time, part of the hydraulic pressure is added to the pressurizing chamber 27 and the lifting rod 21
is pressed down, thereby pressing the valve body 10 against the bottom of the valve chamber 11.

As shown in FIG. 2, when the piston 2 rises and the lower end of the large diameter portion 3 is above the oil passage 24, the lower chamber 4 communicates with the oil passage U.
One hydraulic pressure applied to the lower chamber 4 passes through the oil passage 24 to the valve body 10.
It is added to the lower surface of the tsuba 16. Since the area of the lower surface of the flange 16 is larger than the area of the upper end of the lifting rod 21, the valve body 10 is attached to the lifting rod 21.
Push up to rise. For this reason, as shown in Fig. 3, the valve body 1
0 is separated from the bottom of the valve chamber 11 and the circumferential groove 1 of the valve body 10
5, the upper and lower valve chambers 11 of the flange 13 are communicated with each other, so that the oil pressure from the oil supply port 26 is transferred from the upper and lower valve chambers 11 of the flange 13 to the oil passage 2.
3, it joins the upper chamber 5, and at the same time, it also joins the lower chamber 4 through the oil passage 22.

Therefore, since the hydraulic pressures applied to the upper and lower surfaces of the large diameter portion 3 are balanced, the piston 2 rapidly descends due to the gas pressure in the upper chamber 6 and strikes the chisel 7. During this time, no oil flows out from any of the chambers to the oil drain port 30, and the oil in the lower chamber 4 flows into the middle chamber 51 via the oil passage 22, the valve chamber 11, and the oil passage 23.

In addition, as long as the lower large diameter portion 3 blocks the oil passage 24 and the oil passage 25, the oil on the lower surface of the collar 16 cannot escape, so the valve body 1
0 is held in the raised position.

When the circumferential groove 8 of the large diameter portion 3 descends to the position where it communicates with the oil passages 24 and 25 as shown in FIG. 25 and is discharged from the drain port 30, the push-up blade of the collar 16 disappears, and the valve body 10 is pushed down by the push-down blade of the lifting rod 21, returning to the initial state.

Therefore, as long as oil pressure is applied to the oil supply port 26, the above-mentioned action is repeated, the piston 2 moves up and down, and the chisel 7 is repeatedly struck.

In addition, as for the above-mentioned effect, the excess or deficiency of oil during the movement of the ura between the lower chamber 4 and the middle chamber 5 is caused by the fact that both chambers 4.5, 4.5, or the pressure accumulation chamber 29 or the oil filler port 26 are connected to each other. automatically adjusted.

This invention performs the above-mentioned functions, and its effects (as shown in Matsuki).

As shown in FIG. 3, when the piston 2 enters the downward stroke, the lower chamber 4, the middle chamber 5, the pressure accumulation chamber, and the oil supply port 26 communicate with each other through the switching valve Al.

For this reason, when the piston 3 descends, there is almost no sudden drop in oil pressure in the oil passages 22, 23, the valve chamber 11 between the flange 12, 13, etc., and therefore cavitation and accompanying noise and vibration occur. 2 and damage to the lower chamber 4, oil passage 22, etc.
There isn't that. In addition, the lifting and lowering of the valve body 10 of the switching valve A is always carried out using hydraulic pressure.
This is done by pushing up the blade by hydraulic pressure applied to the lower surface of the flange 16 of the valve body 10 from the oil passage 24 which is switched by the
Operation is extremely reliable.

3. In the example, the cylinder 1 and valve box 9 are shown as one, but this is to make the hydraulic circuit easier to understand, and it goes without saying that in reality, each part is manufactured separately and then assembled. Nor.

[Brief explanation of the drawing]

1 to 4 are longitudinal sectional side views showing the operation of the impact power tool of the present invention. DESCRIPTION OF SYMBOLS 1... Cylinder, 2... Piston, 3... Large diameter part, 4... Lower chamber, 5... Middle chamber, 6... Upper chamber, 7...
・Chisel, 8... Circumferential groove, 10... Valve body, 11...
Valve chamber, 16... Tsuba, 21... Lifting rod, 24.25.
...Oil channel, 26...Oil filler port, Field...Oil drain port, A...
・Automatic switching valve. Patent applicant: Japan Pneumatic Industry Co., Ltd.
Agent Kama 1) Also, 2. Procedural amendment (
1. Indication of the case 1988 Patent Application No. 23477 2. Name of the invention 1. Close-up reed tool 3. Relationship with the person making the amendment Patent applicant address Higashinari-ku, Osaka City 4-11-5, Jinji Name (Name) 1 Hon Pneumatic Kogyo Co., Ltd. 5 Showa Year, Month, Day (Date of slow delivery) 6, Number of inventions to be increased by amendment Contents 1, Meishoku 4 "Scope of Patent Claims" r Attachment 9 has been corrected. 2 Specification d Page λ still missing “Hammer” 7 “Piston” and I
I'm correct. 3. Correct the 3rd shell / and line of the same sentence as ``Down shout position jtJkrMiJ Advancing 1st shift''. From page 3/9th line to the main line [Top row/place: mJkr]
Correct it to "Reverse position". 5. From the 1st line to the ``This bento room...''
7. Make the following corrections. [Furthermore, there is provided means for maintaining the DIJ advancement pupil position by the hydraulic pressure of the valve body τ when the piston is in the lowered position, and means for retracting the valve body by the hydraulic pressure when the piston is in the raised position] 0. From the 72nd line of the shell to the 74th line "in the rising position...
7. ``I'm going to block the upper and lower parts of valve chamber 11,'' M corrected. °7. From the 1011th otogai //1-te 1st "30"
I'm... ”・To delete. 8. 3rd shell of the same / 1st lowest position of the row
I will join J Shin Cry + mJ 0 9, and I will delete the "closed" inn of the 9th shell 79. 10. In the 70th line of the same disease, after ``by pressing'', add ``hold in the forward position''. 11. Do you 7. K/In the second line, “ascent Jτ” and “retreat” are drawn.
E. 12. On the jth line of the last page of the same page, the phrase “to strike.”
I will be joining Week 9 of F-ki. "The diameter of the upper side of the large diameter part 3 of the piston 2 is smaller than the diameter of the lower till, in addition to the gas pressure in the upper chamber 6, the hydraulic pressure generated due to the difference in the vertical cross section of the piston 2. 13, from line 70 of the same page to // line ``Rising rank ra
Jt "retreat position" and Uramasa. 14. 1υ [Delete "Also, close with cut-back valve A..." from line 73 to line 2. 15. Enter the following Jfl code 1] between the 79th line and the last line of the 9th shell. [Figure S shows another embodiment 7 of the variable switching valve N. In the case of this embodiment, the point when the valve body 10 is raised is iJ.
When it is in the forward position, it is in the backward position when it is lowered. That is, the ridges 12.
A projecting edge 14' is further provided at the bottom of 13 and 14, and the fuel filler port 2
The valve chamber between the six projecting edges 14 and 14' and the upper part of the projecting edge 12°
Oil passages 2 buried in each of the lower chambers 4 and 2
2 communicates with the valve chamber 11 between the projecting edges 14 and 14'. The oil drain port 3jJ is connected to the valve chamber 11 between the upper end of the valve chamber 11 and the flange i2. The valve chamber 11 between the valve chambers 13 and 14 and the oil passage 24 communicate with the upper end of the valve chamber 11. The circumference of the valve body 10 (1-15 is provided at a position where the upper and lower sides of the protrusion 6 edge 14 communicate with each other when ascending as shown in FIG.
The upper end of υ protrudes above the flange 16 and fits into the recess at the top of the valve chamber 11, but the portion of the valve body 10 above the flange 16 has a small diameter, and the area of the upper surface of the bay 16 is equal to that of the lower surface. Increase the area. In addition, a valve chamber 11 is provided at the center of the valve body 1U at the oil drain port 30.
At the bottom of It! It is two towns along the 1st and 18th tunnels. Other parts and oil passages are the same as those in the embodiments shown in FIGS. In the dog embodiment described above, in the state shown in Figure 5gj, the piston 2 is at the lowest position 9, and the valve body 1U is at the highest forward position. In this state, when all the pressure oil at a predetermined pressure is supplied to the oil supply port 26, this pressure oil flows from the oil supply port 26 to the valve chamber 11 between the ridges 14 and 14', to the oil passage 22, and then to the lower chamber 4, and flows through the large diameter portion 3. Applying hydraulic pressure to the lower surface of the chamber 5, the oil in the middle chamber 5 flows from the oil path 23 to the rim 14, 13.
Since the oil flows from the valve chamber 11 of the upper chamber 6 to the floating oil port 30 and is discharged, the piston 2 rises while compressing the gas in the upper chamber 6. At this time, a part of the hydraulic pressure enters the valve chamber 11 on the flange 12 and pushes up the lower part of the collar 16, and the valve chamber 11 in the upper part of the collar 16 moves into the oil passage 24. Circumferential groove of the large diameter portion 3 of the piston 20 8. Since the oil passage 25 communicates with the oil drain port 30, the valve body 10 is pushed up and held at the -iJ advancement pupil position. When the screw 1-2 is on the upper side and the lower end of the large diameter part 3 is above the oil wr24, the lower chamber 4 will be 1ffl into the oil 1824, so the hydraulic pressure applied to the lower chamber 4 will be transferred to the oil path 24k n'l & It is added to the upper surface of the guard 16 of the body 10. At this time, 16
Hydraulic pressure is also applied to the bottom surface of the , but its area is 14 i
Since the area of the upper surface of the valve 6 is small, the valve body 10 is moved back due to the difference in the pressing force due to the hydraulic pressure applied to the upper part of the flange 16. straddle the oil passages 22 and 23 f, and let the valve body 1 (
The part above the circumference 11"415 of J connects the oil passage 23 to the oil drain port 3.
Since the connection is made from 0, the oil pressure from the oil filler port 26 is transferred to the large diameter portion 3.
Since the pressing force applied to the upper surface is balanced, the piston 2 rapidly descends due to the gas pressure in the upper chamber 6)
Hit 7. When the upper diameter of the piston 2 is smaller than the lower diameter, in addition to the gas pressure in the upper chamber 6, the hydraulic pressure generated by the difference in the vertical cross section of the piston acts, so that the striking force becomes stronger. During this time, there is no flow pressure of oil from any of the outlets to the oil drain port 3o, and the oil in the lower chamber 4 is flowing through the oil passage 22. Valve chamber 11. Oil road 23
It flows into the middle chamber 5 through the. In addition, the large diameter part 3 on the ``[ side
Since the oil on the upper surface of the hook collar 16 which blocks the oil passage 24 and the oil passage 25 cannot escape, the valve body 10 is held in the retracted position. When the circumferential groove 8 of the large diameter portion 3 descends to the position where it communicates with the oil passage 24.25, the oil in the valve chamber 11 above the collar 16 flows from the oil passage 24 to the circumferential passage 8.
→It flows through the oil passage 25 and is discharged from the oil drain port 30, so the collar 1
The pressing blade 6 disappears, and the valve body 10 is pushed up by the hydraulic pressure applied to the f section of the flange 16 and returns to its initial state. Therefore, when oil pressure is applied to the oil filler port 26, the above action is repeated, the piston 2 moves downward, and the chisel 7 is repeatedly struck. The embodiment of FIG. 5 has the valve body 10 of the automatic switching valve A as described above.
Although the movement is the opposite of the × embodiment shown in Figures 7 to 5, its operation and effect are exactly the same as the embodiments shown in Figures 7 to 5. 16, ``Side view'' in line 2 of page 1θ of the same page will be corrected as stated. Figure 5 shows another example of vertical control 1.
It is a front view. "17, as figure"l: J'j r1 formula'7), "at
') '1%ff charge Lt. Scope of claims

Claims (1)

[Claims] A tool such as a chisel is attached to the lower end of the cylinder so that it can move forward and backward, and a piston that hits the tool when descending is fitted inside the cylinder. A lower chamber for applying gas pressure to the upper end of the piston is provided in the upper part of the cylinder, and a circumferential groove is provided on the outer periphery of the large diameter part. The automatic switching valve, which has an oil filler port 2 and an oil drain port, has a main chamber in the cylinder that connects to the oil filler port in the lower position, a middle chamber that connects to the oil drain port, and a lower chamber in the raised position to refuel. A valve chamber is provided with a valve body that communicates with the fuel filler port and whose middle chamber also communicates with the fuel filler port.A lifting rod is provided in the upper part of this valve chamber to push down the valve body using hydraulic pressure applied from the fuel filler port. Ct, when the piston is in the lowered position, the oil passage through the circumferential groove and the oil drain hole of the large diameter part of the piston is cut off by the large diameter part when it is in the raised position, and the oil passage that is blocked by the large diameter part when the piston is in the lowered position. The circumferential groove of the diameter part communicates with the oil passage, and when the piston moves up, the lower chamber in the cylinder communicates with the valve chamber against the lower surface of the flange at the upper end of the valve body, and hydraulic pressure is applied to the lower surface of the flange, causing the valve body to move. An impact power tool with one oil passage that pushes up against the pushing blade of the lifting rod.