MXPA99010492A - Tip valve for pneumatic tool - Google Patents

Tip valve for pneumatic tool

Info

Publication number
MXPA99010492A
MXPA99010492A MXPA/A/1999/010492A MX9910492A MXPA99010492A MX PA99010492 A MXPA99010492 A MX PA99010492A MX 9910492 A MX9910492 A MX 9910492A MX PA99010492 A MXPA99010492 A MX PA99010492A
Authority
MX
Mexico
Prior art keywords
valve
bore
rod
valve member
axis
Prior art date
Application number
MXPA/A/1999/010492A
Other languages
Spanish (es)
Inventor
S Pusateri Daniel
Original Assignee
Snapon Tools Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Snapon Tools Company filed Critical Snapon Tools Company
Publication of MXPA99010492A publication Critical patent/MXPA99010492A/en

Links

Abstract

A tip valve (22) for a pneumatic tool includes a first valve member (24) having a bore (26) with a central axis (A) and defining a valve seat (30) about the bore (26) and a second valve member (34) having an engaging surface engageable with the valve seat (30) to form a substantially fluid-tight seal therewith.

Description

PUNCT VALVE FOR PNEUMATIC TOOL Background of the Invention 1. Field of the Invention This invention relates in general to pneumatic tools and in particular to operating valves for these tools. 2. Description of the Prior Art Many tool motors are controlled pneumatically. Priority valves have been provided to restrict and control the air flow for these pneumatic tools. As seen in Figure 2, these prior art valves include a valve seat having a bore (to allow through air flow) with a central axis and a second valve member having a coupling surface that drifts against the valve seat, to form a substantially fluid-tight seal and a rod coupled to the second valve member and disposed coaxially through the bore in the normal closed position. The rod is coupled to a trigger mechanism to open and close the valve. Pressing the trigger tilts or tapers the rod and coupling surface away from the valve seat. This inclination allows air flow through the perforation of the valve seat. However, the restrictions of the cylinder on which the second valve member rests, do not allow the second valve member to be tilted sufficiently so that it does not prevent air flow and allows maximum flow through the borehole to efficiently operate the valve. Pneumatic motor. Attempts to solve this problem have simply included enlarging the second valve member and the through hole. This solution, however, results in the widening of the handle of the tool that surrounds the valve seat, making the handle too large and problematic to be used comfortably. SUMMARY OF THE INVENTION A general objective of the invention is to provide an improved tip valve for pneumatic tools, which avoids the disadvantages of previous valves, while producing additional operational and structural advantages. An important feature of the invention is to provide a tip valve that is relatively simple and inexpensive construction. A still further feature of the tip valve of the present invention is that it allows maximum through-air flow without increasing the size of the tool where it is incorporated.
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 bore with a central axis and defining a valve seat with respect to the bore and a second valve member having a coupling surface, which engages with the valve seat for form a substantially fluid-tight seal. The tip valve also includes a rod coupled to the second valve member and disposed through the bore, wherein at least a portion of the rod is displaced from the shaft and an operative valve member coupled to the rod and mounted on the body for movement. between a closed position, wherein the second valve member engages the valve seat and an open position, wherein the second valve member is inclined from the valve seat to allow air flow through the bore. The tip valve also includes a resilient structure disposed in the body by moving the second valve member against the valve seat and the valve operating member to its closed position. The invention consists of certain novel features and a combination of parts that are fully described below, illustrated in the accompanying drawings and particularly pointed out in the appended claims, it being understood that various changes can be made to the details without departing from the spirit or sacrificing any of the advantages of the present invention. Brief Description of the Drawings For purposes of facilitating an understanding of the invention, a preferred embodiment thereof is illustrated in the accompanying drawings, from an inspection of which, when considered in connection with the following description, the invention, its construction and operation, and many of its advantages should be understood and understood. appreciate yourself easily. Figure 1 is a side elevational view of the pneumatic tool of the present invention; Figure 2 is a fragmentary sectional view of a tip valve of the prior art; Figure 3 is an enlarged fragmentary side elevational view of the handle of the tool of Figure 1, partially broken away and in partial section, to illustrate the tip valve of a first embodiment of the present invention; Figure 4 is a further enlarged fragmentary sectional view of the tip valve of Figure 3 in the closed position; Figure 5 is a view similar to Figure 4 of the tip valve in the open position; Figure 6 is an exploded perspective view of some of the components of the tip valve of Figure 3; Figure 7 is a sectional view taken generally on lines 7-7 of Figure 4; Figure 8 is a view similar to Figure 4 illustrating a second tip valve of the present invention in the closed position; Figure 9 is a sectional view taken generally on line 9-9 of Figure 8; Figure 10 is a view similar to Figure 8 illustrating the tip valve in the open position; Figure 11 is an exploded perspective view of some of the components of the tip valve of Figure 8; and Figure 12 is a sectional view taken generally on line 12-12 of Figure 8. Detailed Description of Preferred Modes Now with reference to Figures 1 and 3, a pneumatic tool such as an impact wrench is illustrated. 10. The impact wrench 10 includes a body 12 comprising a hand grip portion 14 and a motor housing portion 16. The motor (not shown) of the impact wrench 10 is operated in a known manner, by air tablet which is supplied through an external air line 18 connected to an air source (not shown) and through a cylindrical air channel 20 formed by a cylindrical wall 21 within the manual clamping portion 14. A valve Tip 22 is provided to control the amount of air supplied to the engine. As seen in Figures 4 to 6, the tip valve 22 includes a first valve member 24 fixed to the upper end of the air channel 20 by a friction fit or the like. The first valve member 24 includes a central bore 26 having a central axis "A" (Figure 6). The first valve member has a bottom end 28 which defines a valve seat 30 relative to the bore 26. As discussed below, the first valve member 24 includes a projecting structure 32 projecting and depending on the bottom end. 28. The tip valve 22 also includes a second valve member 34 having a central axis, an upper star-shaped portion 36 and a bullet-shaped lower portion 38 which is axially dependent thereon. The outer periphery of the star-shaped portion 36 forms a plurality of recesses 37 between the star-shaped portion 36 and the cylindrical wall 21. The star-shaped portion 36 has a substantially planar engaging surface 40 engageable, as shown in FIG. see in Figure 4, with the valve seat 30 to form a substantially fluid tight seal. The tip valve 22 also includes an elongate straight rod 42 having an axis offset from and parallel to the central axis of the second valve member 34. The rod 42 has a first end 44 coupled to or embedded in the second valve member 34 and a second end 46 disposed through the bore 26. The tip valve 22 further includes an operating member 48 comprising a trigger button 50 projecting out of the body 12 and engaging an end of an elongate rod 52. The elongated rod 52 it includes a perforation 54 at its other end. The perforation 54 is chamfered at both ends and has a narrower diameter central portion 56. The operating member 48 engages the rod 42, disposed through the perforation 54. The tip valve 22 also includes a resilient structure such as a coil spring 58, disposed in the air channel 20 of the body 12 and surrounding the lower portion 38 of the second valve member 34 to bypass by closing the valve. As seen in Figure 4, as the helical spring 58 displaces the mating surface 40 of the second valve member 34 in engagement with the valve seat 30 to form a substantially liquid-tight seal between them, the rod 42 coupled to the elongate rod 52, keeps the operating member 48 in the closed position. When the operating member 48 is in the closed position, the rod 42 is displaced from the central axis "A" of the bore 26 and is disposed between the "A" axis and the trigger button 50. The operating member 48 is movable from the closed position in Figure 4 to an open position as illustrated in Figure 5. A user simply pushes the trigger button 50 in the direction of arrow D in Figure 5, which causes the elongated rod 52 to move in the same direction and causes the coupled rod 42 to tilt the mating surface 40 of the second valve member 34 away from the valve seat 30, to allow air to circulate through the bore 26 to energize the air motor. Since the rod 42 is displaced from the axis of the second valve member 34, it allows the coupling surface 40 to tilt at least 30 ° away from the plane of the valve seat 30 to reduce restriction of air flow through the bore 26 by the second valve member 34. It has been found that, when the angle formed between the plane of the mating surface 40 and the plane of the valve seat 30 is greater than about 30 °, the second valve member 34 substantially does not restrict flow of air through the perforation 26. This is a great improvement over the tip valves of the prior art, an example of which is seen in Figure 2, where like reference numerals refer to similar parts. The tip valve 22"of the prior art has a second valve member 34" with a central axis and an elongated straight stem 42", which is substantially coaxial with the axis of the second valve member 34". The location of the rod 42"relative to the axis of the second valve member 34" allows the coupling surface 40"of the second valve member 34" to tilt only a relatively small angle, substantially less than 30 ° with respect to the plane of the seat valve 30. At this smaller angle of inclination, the second valve member 34"restricts the flow of air through the bore 26. The tip valve 22 of the present invention also includes a structure to substantially prevent the second valve member 34 and rod 42 rotate with respect to any of their respective axes in use If the second valve member 34 were to be rotated, the rod 42 can no longer be disposed between the "A" axis and the trigger button 50. in the closed position of the operating member 48, in this way preventing the coupling surface 40 from tilting at such a large angle as illustrated in Figure 5. As seen or in Figure 7, the projecting structure 32 is disposed in a recess 37 which prevents that rotation. Alternatively, the projecting structure 32 may not be necessary, if the central portion 56 of the perforation 54 of the elongate rod 52 is sufficiently small to prevent rotation. Figures 8 to 12 show a second tip valve 122 substantially identical to the tip valve 22 of Figures 1 and 3 to 7. As seen in Figures 8, 10 and 11, tip valve 122 includes a first member. valve 124 fixed at the upper end of the air channel 20 by a friction fit or the like. The first valve member 124 includes a central bore 126 having a central axis "E" (Figure 8) and a bottom end 128 defining a valve seat 130 relative to the bore 126. The tip valve 122 also includes a second valve member 134 having a central axis, an upper star-shaped projection 136. and a bullet-shaped lower portion 138 axially dependent therefrom. The star-shaped portion 136 has a substantially planar engagement surface 140, which engages as seen in Figure 10, with the valve seat 130 to form a substantially fluid-tight seal. The tip valve 122 also includes a bar-shaped rod 142. The rod 142 has a first portion 144 coupled to or embedded in the second valve member 134, coaxial with it and a second portion 146 disposed through the bore 126 and inclined with respect to the first portion 144. The tip valve 122 further includes an operating member 148. The operating member 148 includes a trigger button 150 projecting out of the body 12 coupled to one end of an elongate rod 152. The other end of the elongated rod 152 bifurcates to form a slot 154. The second portion 146 of the operating member 148 engages in the slot 154 as best seen in Figure 9. The tip valve 122 also includes a resilient structure, such as a helical spring 158 disposed with respect to the lower portion 138 and in the air channel 20 of the body 12 moving the valve to close. The coil spring 158 as seen in Figure 8, as the coil spring 158 displaces the mating surface 140 of the second valve member 134 in engagement with the valve seat 130 to form a substantially fluid-tight seal between them. . Additionally, the second portion 146 of the rod 142 coupled to the elongate rod 152 holds the operating member 148 in the closed position. When the operating member 148 is in the closed position, the second portion 146 of the rod 142 is inclined from the central axis "E" of the bore 126 and disposed between the "E" axis and the trigger button 150. The operating member 148 is moving from the closed position in Figure 9 to an open position as illustrated in Figure 10. A user simply pushes the trigger button 150 in the direction of arrow H in Figure 9, which causes the elongate rod 152 and the rod 142 moves in the same direction, tilting the coupling surface 140 of the second valve member 134 more than 30 ° away from the valve seat 130 to allow air to circulate substantially unrestricted through the bore 126 to energize the motor tire. While particular embodiments of the present invention have been illustrated and described, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects. Therefore, the aim in the appended claims is to cover all these changes and modifications that fall within the spirit and actual scope of the invention. The matter set forth in the foregoing description and accompanying drawings is offered by way of illustration only and not as a limitation. The current scope of the invention is intended to be defined in the following claims when seen in the proper perspective based on the prior art.

Claims (13)

  1. CLAIMS 1. A tip valve for a pneumatic tool having a body, the tip valve comprises: a first valve member having a bore with a central axis and defining a valve seat with respect to the bore; a second valve member having a coupling surface that engages with the valve seat to form therewith a substantially fluid-tight seal; a rod coupled to the second valve member and disposed through the bore, wherein at least a portion of the rod is displaced from the shaft; an operating member of valve coupled to the rod and mounted on the body for movement between a closed position, wherein the second valve member engages with the valve seat and an open position, wherein the second valve member is inclined from the valve seat to allow air flow through the bore; and resilient structure disposed in the body by displacing the second valve member against the valve seat and the valve operating member to its closed position.
  2. 2. The valve according to claim 1, characterized in that the rod is straight and has a rod axis parallel to the axis of the bore.
  3. 3. The valve according to claim 2, characterized in that the valve operating member has a first end coupled to the rod and a second end coupled to a trigger button, wherein the rod axis is between the trigger button and the axis of the bore. in the closed position.
  4. The valve according to claim 3, characterized in that the second valve member has an outer periphery with at least one recess and further comprises a projecting structure fixed with respect to the body and disposed in the recess, whereby the projecting structure substantially avoids rotation of the second valve member.
  5. The valve according to claim 4, characterized in that the projecting structure is coupled to the first valve member.
  6. The valve according to claim 4, characterized in that the outer periphery of the second valve member is star-shaped.
  7. The valve according to claim 1, characterized in that the rod has a portion angled with respect to the axis of the bore.
  8. 8. The valve according to claim 7, characterized in that the valve operating member has a first slotted end which engages the rod and a second end coupled to a trigger button, and wherein the angled portion has a free end disposed between the shutter button and the axis of the perforation in the closed position.
  9. The valve according to claim 1, characterized in that the seat defines a first plane and the coupling surface defines a second plane, and when the operating valve member is in the open position, the angle between the first and second planes is at least about 30 °.
  10. 10. A tip valve for a pneumatic tool having a body, the tip valve comprising: a first valve member having a bore with a central axis and defining a valve seat with respect to the bore; a second valve member having a coupling surface that engages the valve seat to form therewith a substantially fluid-tight seal; an operating valve member mounted on the body for movement between closed and open positions; the valve operating member and the second valve member are disposed respectively on opposite sides of the first valve member; a rod extending non-coaxially through the bore and interconnecting the second valve member and the valve operating member, -when the operating valve member is in its closed position, the second valve member engages with the valve seat; when the valve operating member is in its open position, the second valve member is inclined from the valve seat to allow air flow through the bore; and a resilient structure disposed in the body by moving the second valve member against the valve seat and the valve operating member to its closed position. The valve according to claim 10, characterized in that the rod is straight and has a rod axis parallel to the axis of the bore. The valve member according to claim 10, characterized in that the rod has an angled portion inclined with respect to the axis of the bore. The valve according to claim 12, characterized in that the structure further includes a second portion coupled to the angled portion and the second valve member.
MXPA/A/1999/010492A 1998-03-20 1999-11-15 Tip valve for pneumatic tool MXPA99010492A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09044942 1998-03-20

Publications (1)

Publication Number Publication Date
MXPA99010492A true MXPA99010492A (en) 2000-06-01

Family

ID=

Similar Documents

Publication Publication Date Title
US6062323A (en) Pneumatic tool with increased power capability
US8430184B2 (en) Valve for a pneumatic hand tool
US6568298B1 (en) Reversible ratchet head assembly
US6324947B2 (en) Locking swivel wrench
US4722252A (en) Power driven wrench
US6789447B1 (en) Reversible ratchet head assembly
EP0983459B1 (en) Tip valve for pneumatic tool
JP4295228B2 (en) Air driven tool
US7036795B2 (en) Valve apparatus for air tool
US6138532A (en) Wrench having driving direction indicator
MXPA99010492A (en) Tip valve for pneumatic tool
US6438797B1 (en) Mop handle with improved water flow control
US7445055B2 (en) Trigger-actuated tip-type air valve with integrated wear surface
CN113894754A (en) Reversing mechanism for power tool
US6431846B1 (en) Reversible pneumatic motor assembly
US5632186A (en) Reversible screwdriver
KR200495283Y1 (en) Angle valve with rotatable spindle
JP4681695B2 (en) Pressure reducing valve
CA2787213A1 (en) Device for controlled operation of a surgical or dental drive unit
MXPA00002184A (en) Pneumatic tool with increased power capability
JP2005212082A (en) Air tool
GB2327255A (en) Tap and valve tool
JP2005069431A (en) Control valve
JPH07139658A (en) Connection device for actuator to valve shaft