Tip valve for pneumatic tool

专利摘要:
The pneumatic tool tip valve 22 has a bore 26 with a central axis A and a first valve member 24 forming a valve seat 30 around the bore 26 and tight fluid seal. And a second valve member 34 having a mating surface engageable with the valve seat 30 to form.
公开号:KR20010012670A
申请号:KR1019997010631
申请日:1999-03-12
公开日:2001-02-26
发明作者:푸사테리다니엘에스.
申请人:스넵-온 툴스 캄파니；
IPC主号:

专利说明:

Tip valve for pneumatic tools {TIP VALVE FOR PNEUMATIC TOOL}
The motors of many tools are pneumatically operated. Valves for limiting or controlling air flow for such pneumatic tools have already been proposed. As shown in FIG. 2, this prior art valve is biased relative to the valve seat to form a tight fluid seal with a valve seat having an axial bore in the center (allowing air flow therebetween). A second valve member having a mating surface, and a stem connected to the second valve member and disposed coaxially through the bore in a normal closed position. The stem is connected to a trigger mechanism to open and close the valve. Pressing the trigger moves the stem and causes the engagement surface to deviate from the valve seat.
This tipping will allow air flow through the bore of the valve seat. However, restraining the cylinder on which the valve member is seated prevents the second valve member from moving farther, and thus prevents efficient operation of the pneumatic motor because it blocks the air flow and allows maximum air flow through the bore.
An attempt to solve this problem is to enlarge the second valve member and the bore. However, this solution extends the handle of the tool surrounding the valve seat, making the handle too large and hindering its comfortable use.
The present invention relates to a tip valve for a pneumatic tool, and more particularly to an actuating valve for such a tool.
1 is a side cross-sectional view of a pneumatic tool of the present invention.
2 is a partial cross-sectional view of a tip valve of the prior art;
3 is an enlarged side cross-sectional view of the handle of the tool of FIG.
4 is a partially enlarged cross sectional view of the tip valve of FIG. 3 in a closed position;
5 is a partially enlarged cross sectional view of the tip valve in an open position;
6 is an enlarged perspective view of some components of the tip valve of FIG. 3.
7 is a sectional view along line 7-7 of FIG. 4;
8 shows a second tip valve of the invention in a closed position;
9 is a sectional view along line 9-9 of FIG. 8;
FIG. 10 is a view similar to FIG. 8 showing the tip valve in an open position; FIG.
FIG. 11 is an enlarged perspective view of some components of the tip valve of FIG. 8. FIG.
12 is a sectional view along line 12-12 of FIG. 8;
It is an object of the present invention to provide an improved tip valve for a pneumatic tool that provides advantages in construction and operation while avoiding the disadvantages of the prior art.
The main feature of the present invention is to provide a tip valve of a simple and economical structure.
Another feature of the tip valve of the present invention is to allow for maximum air flow without increasing the size of the tool used.
One or more of these features can be achieved by providing a tip valve for a pneumatic tool having a body. The tip valve includes a first valve member having a central axis bore and forming a valve seat around the bore and a second valve member having a mating surface engageable with the valve seat to form a tight fluid seal. . The tip valve is connected to a second valve member and disposed through the bore;
A valve actuating member mounted to the body and connected to the stem for movement between the closed position and the open position, at least a portion of the stem overlapping the axis, in which the second valve member engages the valve seat and In the open position, the second valve member is inclined from the valve seat to allow air flow through the bore. The tip valve includes an elastic structure disposed in the body for urging the second valve member to the closed position with respect to the valve seat and the valve actuating member.
Other objects, features and advantages of the present invention will be more clearly understood by the following detailed description with reference to the accompanying drawings.
1 and 3 show a pneumatic tool such as an impact wrench 10. The impact wrench 10 includes a body 12 composed of a hand grip portion 14 and a motor housing portion 16. The motor (not shown) of the impact wrench 10 is compressed through a cylindrical air channel 20 formed in the hand grip portion 14 by an external air line and cylinder wall 21 connected to an air source (not shown). It is operated in a known manner by air.
Tip valve 22 is provided to control the amount of air dispensed to the motor. As shown in FIGS. 4-6, the tip valve 22 includes a first valve member 24 fixed to the upper end of the air channel 20 by a friction insert or the like. The first valve member 24 comprises a central bore 26 having a central axis A (FIG. 6).
The first valve member has a bottom end 28 that forms a valve seat 30 around the bore 26. As described below, the first valve member 24 includes a protruding structure 32 that protrudes and is suspended from the bottom end 28.
The tip valve 22 comprises a second valve member 34 having a central axis, a star shaped top 36, and an axially suspended bullet bottom 38. The outer circumference of the star-shaped upper portion 36 forms a plurality of recesses 37 between the upper portion 36 and the cylinder wall 21. The star shaped top 36 includes a flat engagement surface 40 that is engageable with the valve seat 30 to form a tight fluid seal as shown in FIG. 4.
The tip valve 22 includes an elongated straight stem 42 having an axis parallel to and overlapping the central axis of the second valve member 34. The stem 42 includes a first end 44 connected to or embedded in a second valve member 34 and a second end 46 disposed through the bore 26.
The tip valve 22 includes a trigger button 50 which projects out of the body 12 and is connected to an end of the elongated rod 52. The elongated rod 52 includes a bore 54 at the other end thereof. The bore 54 is chamfered at both ends thereof and has a narrow diameter center 56. The actuating member 48 is operatively connected to the stem 42 disposed through the bore 54.
The tip valve 22 is an elastic structure such as a coil spring 58 disposed in the air channel 20 of the body 12 around the lower portion 38 of the second valve member 34 to bias the valve in the closed state. It includes. As shown in FIG. 4, the elongated rod as the coil spring 58 presses the engagement surface 40 of the second valve member 34 that engages the valve seat 30 to form a tight fluid seal. A stem 42 connected to 52 keeps the operating member 48 in the closed position. When the actuation member 48 is in the closed position, the stem 42 overlaps from the central axis A of the bore 26 and is located between the axis A and the trigger button 50.
The actuating member 48 is movable from the closed position of FIG. 4 to the open position of FIG. 5. The user simply presses the trigger button 50 in the direction of the arrow D of FIG. 5 to move the elongated rod 52 in the same direction.
The connected stem 42 is inclined to the engagement surface 40 of the second valve member 34 in a direction away from the valve seat 30 to introduce air through the bore 26 to operate the pneumatic motor. Since the stem 42 is superimposed from the axis of the second valve member 34, the engagement surface 40 allows the valve to restrict the flow of air flowing through the bore 26 by the second valve member 34. Allow to incline about 30 ° from the plane of the seat 30. When the angle formed between the mating surface 40 and the plane of the valve seat 30 is greater than 30 °, the second valve member 34 does not restrict air flow through the bore 26.
This is a significant improvement over conventional tip valves, the embodiment of which is shown in FIG. 2, wherein like components have been given the same reference numerals. The prior art tip valve 22 'comprises a second valve, member 34' having a central axis and an elongated straight stem 42 ', the elongated straight stem 42' being a second valve member. It is coaxial with the axis of (34 '). The position of the scoop 42 'along the axis of the second valve member 34' is such that the engagement surface 40 'of the second valve member 34' is smaller than 30 ° with respect to the plane of the valve seat 30. Tilt it to an angle. At this small angle of inclination, the second valve member 34 ′ restricts air flow through the bore 26.
The tip valve 22 of the present invention has a structure that, in use, prevents the second valve member 34 and the stem 42 from rotating around each axis. If the second valve member is rotated, the stem 42 is no longer positioned between the trigger button 50 and the axis A in the closed position of the actuating member 48, so that a large angle as shown in FIG. The coupling surface 40 is prevented from inclining. As shown in detail in FIG. 7, the projecting structure 32 is disposed in the recess 37 which prevents such rotation. Optionally, the projecting structure 32 may not be necessary if the center 56 of the bore 54 of the elongated rod 52 is small enough to prevent rotation.
8 to 12 show the same as the tip valve 22 of FIGS. 1 and 3 to 7. As shown in FIGS. 8 and 10 and 11, the tip valve 122 includes a first valve member 124 fixed to the upper end of the air channel 20 by frictional insertion or the like. The first valve member 124 includes a central bore 126 having a central axis E (FIG. 8) and a bottom end 128 forming a valve seat 130 around the bore 126. .
The tip valve 122 includes a second valve member 134 having a central axis, a star-shaped upper protrusion 136, and a lower portion 138 suspended in an axial direction therefrom. The star shaped upper protrusion 136 has a flat engagement surface 140 engageable with the valve seat 130 to form a tight fluid seal as shown in FIG. 10.
The tip valve 122 includes a bar stem 142. The stem 142 is axially embedded with a first portion 144 embedded in or coupled to a second valve member, and a second portion inclined relative to the first portion 144 and disposed through the bore 126. 146.
The tip valve 122 further includes an actuating member 148. The actuating member 148 protrudes out of the body 12 and includes a trigger button 150 connected to an end of the elongated rod 152. The other end of the elongated rod 152 is branched to form a slot 154. The second portion 146 of the actuating member 148 is coupled to the slot 154 as shown in detail in FIG. 9.
The tip valve 122 includes an elastic structure, such as a coil spring 158 disposed around the lower portion 138 in the air channel of the body 12 that presses the valve closed. As shown in FIG. 8, the coil spring 158 presses the engagement surface 140 of the second valve member 134 in engagement with the valve seat 130 to form a tight fluid seal. In addition, the second portion 146 of the stem 142 coupled to the elongated rod 152 keeps the operating member 148 closed. When the actuating member 148 is in the closed state, the second portion 146 of the stem 142 is inclined from the central axis E of the bore 126, between the axis E and the trigger button 150. Is placed on.
The operating member 148 can be moved from the closed position shown in FIG. 9 to the open position shown in FIG. 10. The user presses the trigger button 150 in the direction of the arrow H shown in FIG. 9 to move the elongated rod 152 and the stem 142 in the same direction, and the engagement surface of the second valve member 134 ( By inclining 140 over 30 ° from valve seat 130, air passes unrestricted through bore 126 to operate the pneumatic motor.
The present invention has been described with reference to the preferred embodiments, and is not limited thereto, and one of ordinary skill in the art should recognize that various modifications and changes can be made to the present invention without departing from the appended claims.

权利要求:
Claims (13)
[1" claim-type="Currently amended] In a pneumatic tool tip valve having a body and a tip valve,
A bore having a central axis and a first valve member forming a valve seat around the bore;
A second valve member having a mating surface engageable with the valve seat to form a tight fluid seal;
A stem disposed through the bore and connected to the second valve member, at least a portion of which overlaps the axis;
A valve coupled to the stem and mounted to the body for movement between a closed position in which the second valve member engages with the valve seat so that air can flow through the bore and a second valve member inclined from the valve seat;
And a resilient structure disposed in the body for urging the second valve member to its closed position against the valve seat and the valve actuating member.
[2" claim-type="Currently amended] The tip valve of claim 1, wherein the stem is straight and includes a stem that is parallel to the bore axis.
[3" claim-type="Currently amended] 3. A valve according to claim 2, wherein the valve actuation member comprises a first end connected to the stem and a second end connected to the trigger button, wherein the stem axis is disposed between the bore axis and the trigger button in the closed position. Tip valve for pneumatic tools.
[4" claim-type="Currently amended] 4. The second valve member of claim 3, wherein the second valve member has an outer circumference with at least one recess and includes a protrusion structure disposed in the recess and fixed relative to the body, the protrusion structure rotating the second valve member. Tip valve for pneumatic tools, characterized in that to prevent.
[5" claim-type="Currently amended] 5. The tip valve of claim 4 wherein the projecting structure is connected to a first valve member.
[6" claim-type="Currently amended] 5. The pneumatic tool tip valve according to claim 4, wherein the outer circumference of the second valve member is in the form of a star.
[7" claim-type="Currently amended] 2. The tip valve of claim 1 wherein the stem includes an angle portion that is inclined with respect to the axis of the bore.
[8" claim-type="Currently amended] 8. The actuating member of claim 7, wherein the actuating member comprises a slotted first end connected to the stem and a second end connected to the trigger end, the angle portion including a free end disposed between the bore axis and the trigger button in the closed position. Tip valve for pneumatic tools, characterized in that.
[9" claim-type="Currently amended] 2. The seat of claim 1 wherein the seat defines a first plane, the engagement surface forms a second plane, and the angle between the first plane and the second plane is at least 30 ° when the valve actuating member is in the open position. Tip valve for pneumatic tools, characterized in that.
[10" claim-type="Currently amended] In a pneumatic tool tip valve having a body and a tip valve,
A bore having a central axis and a first valve member forming a valve seat around the bore;
A second valve member having a mating surface engageable with the valve seat to form a tight fluid seal;
A valve actuating member mounted to the body for moving between a closed position and an open position,
A stem extending coaxially through the bore and interconnecting the second valve member and the valve actuating member;
An elastic structure disposed in the body for urging the second valve member to its closed position with respect to the valve seat and the valve actuating member,
The valve actuation member and the second valve member are respectively disposed on opposite sides of the first valve member, the second valve member is engaged with the valve seat when the valve actuation member is in the closed position, and the valve actuation member is in the open position. And wherein the second valve member is inclined from the valve seat to allow air to flow through the bore.
[11" claim-type="Currently amended] 11. The tip valve of claim 10 wherein the stem is straight and includes a stem axis parallel to the axis of the bore.
[12" claim-type="Currently amended] 11. The tip valve of claim 10 wherein the stem includes an angled portion that is inclined with respect to the bore axis.
[13" claim-type="Currently amended] 13. The tip valve of claim 12 wherein the structure further comprises a second portion connected to the angle portion and the second valve member.

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
1998-03-20|Priority to US09/044,942

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1998-03-20|Priority to US09/044,942

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1999-03-12|Application filed by 스넵-온 툴스 캄파니

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1999-03-12|Priority to PCT/US1999/005543

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2001-02-26|Publication of KR20010012670A

优先权:

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申请号 | 申请日 | 专利标题

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US09/044,942|US6027099A|1998-03-20|1998-03-20|Tip valve for pneumatic tool|

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US09/044,942|1998-03-20|

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PCT/US1999/005543|WO1999049249A1|1998-03-20|1999-03-12|Tip valve for pneumatic tool|