The present invention relates to pneumatic tools. Specifically, the present invention is directed to an pneumatic tool actuation device.
Pneumatic tools are becoming increasingly common in many industries including the construction industry. Examples of pneumatic tools include pneumatic nailers, jackhammers, riveters, and the like. The operation of most pneumatically operated tools is relatively simple: compressed air from an air compressor flows through a tube into the housing of the pneumatic tool and the pressure of the compressed air is used to force movement of a piston or other mechanism in the tool to do work.
A pneumatic tool typically is activated by depressing a trigger to drive nails, rivets, staples, or similar fasteners. In automated applications, actuation devices are used to depress the trigger of the pneumatic tool. These actuation devices, though, can be large and involve complicated assembly. Known actuation devices use elaborate pulley systems; these devices, however, can be heavy and sometimes can interfere with the use of the tool.
Accordingly, there is a need for a simple, easy to use, lightweight trigger actuation device. Desirably, such an actuator can be made of a lightweight material and able to withstand fast, repetitive use. More desirably, such an actuator is readily made and usable, and has a high degree of integrity at minimal cost.
The present invention is directed to a pneumatic tool actuation device. The device comprises a housing configured to attach to a pneumatic tool, a piston slidably moveable within a drive chamber formed within the housing, and an O-ring disposed in a groove formed in the piston and forming a seal between the piston and the drive chamber. The housing has a gas inlet/outlet which is configured to be connected to a hose through which a gas travels and enters the drive chamber to slidably move the piston within the drive chamber. The movement of the piston actuates a trigger on the pneumatic tool.
The benefits and advantages of the present invention will become more readily apparent to those of ordinary skill in the relevant art after reviewing the following detailed description and accompanying drawings, wherein:
While the present invention is susceptible of embodiment in various forms, there is shown in the drawings and will hereinafter be described a presently preferred embodiment with the understanding that the present disclosure is to be considered an exemplification of the invention and is not intended to limit the invention to the specific embodiment illustrated.
It should be further understood that the title of this section of this specification, namely, “Detailed Description Of The Invention,” relates to a requirement of the United States Patent Office, and does not imply, nor should be inferred to limit the subject matter disclosed herein.
All patents referred to herein, are hereby incorporated herein by reference, whether or not specifically done so within the text of this disclosure.
In the present disclosure, the words “a” or “an” are to be taken to include both the singular and the plural. Conversely, any reference to plural items shall, where appropriate, include the singular.
The present invention pertains to an actuation device configured to depress a trigger on a pneumatically driven tool as illustrated in the figures. The actuation device 10 can be used on a pneumatic nailer as shown; however, it is also contemplated that the actuation device 10 can be used on other pneumatic tools and such uses should be considered to be within the scope of this invention. The actuation device 10 is configured to depress the trigger 52 on the pneumatic tool 50 when device 50 is actuated, thereby actuating the pneumatic tool 50.
The actuation device 10 is comprised of a housing 12 having a piston 14 disposed therein. The actuator housing 12 is a one-piece unit composed of a main body 13 and integral actuator attachment arms 22, 23 as seen in
In the preferred embodiment, the main body 13 of the housing 12 has a triangular-shaped clearance cutout 40 formed on an outer surface to accommodate the follower N (nail pusher) on the pneumatic nailer 50 as follower N moves toward the front or disbursal section of the nailer 50 as the nail count in the magazine is depleted.
A drive chamber 42 is formed as a cylindrical bore extending partially through the main body 13 of the actuator housing 12, as shown in
Actuator attachment arms 22, 23 are integral with the main body 13 of the actuator housing 12. The actuator arms 22, 23 are spaced apart, allowing for the attachment arms 22, 23 to straddle the trigger housing 54.
As shown in
The piston 14 comprises a piston head 15, a groove G, a support plate P, and a shaft S. An O-ring 16 is disposed in the groove G of the piston 14. The O-ring 16 acts as a seal or gasket to prevent air from escaping up along the sides of the drive chamber 42, between the piston 14 and the drive chamber 42. It is contemplated that the material used for the O-ring is suitable for extremes in temperature and capable of withstanding repetitive movement and/or vibration, such as a rubber O-ring as is known in the art.
As shown in
The actuator 10 is attached to the pneumatic tool 50 by pins 18, 19. The pins 18, 19 attach the actuator housing 12 to the trigger housing 54 through pin holes 20, 21 in the actuator housing 12 and through the trigger housing holes 56, 57. It is anticipated that the pneumatic tool 50 has pre-formed holes in the trigger housing 54 to accept pins 18. However, those skilled in the art will recognized that holes may need to be formed in other pneumatic tools to attach the actuator 10 or that other attachment methods may be required depending on the design of the particular pneumatic tool.
Looking to
Air from the compressor is pressurized; therefore, when a control valve is opened, or when a signal from a control system activates, air flows from the compressor through the hose 26, through air inlet chamber 34 and into the drive chamber 42 of the actuator 10. The pressurized air in the drive chamber 42 pushes against the support plate P of the piston 14, forcing the piston 14 to move slidably within the drive chamber 42 and toward the trigger 52 of the pneumatic tool 50. The piston 14 then contacts the trigger 52 of the pneumatic tool 50 and depresses the trigger 52, thereby actuating pneumatic tool 50.
After the pneumatic tool 50 is actuated, the air is released from hose 26, and the trigger 52, which is spring-loaded in most pneumatic tools, returns to its original position, forcing the piston 14 to retract and slidably move within the drive chamber 42 toward the housing 12 in preparation for the next actuation. As will be appreciated by those skilled in the art, a shuttle valve may be used in conjunction with the compressor to control the flow of air to and from the actuator 10.
From the foregoing it will be observed that numerous modifications and variations can be effectuated without departing from the true spirit and scope of the novel concepts of the present invention. It is to be understood that no limitation with respect to the specific embodiments illustrated is intended or should be inferred. The disclosure is intended to cover by the appended claims all such modifications as fall within the scope of the claims.
Number | Name | Date | Kind |
---|---|---|---|
3272267 | Langas | Sep 1966 | A |
3563438 | Doyle et al. | Feb 1971 | A |
3653299 | Howard | Apr 1972 | A |
3796270 | Lange | Mar 1974 | A |
3815627 | Farrell et al. | Jun 1974 | A |
3828458 | Skone-Palmer | Aug 1974 | A |
4122904 | Haytayan | Oct 1978 | A |
4196833 | Haytayan | Apr 1980 | A |
4385297 | Schmitt et al. | May 1983 | A |
4448338 | Graf et al. | May 1984 | A |
4509669 | Elliesen | Apr 1985 | A |
4932313 | Gutknecht | Jun 1990 | A |
5410942 | Begneu | May 1995 | A |
6722547 | Wang et al. | Apr 2004 | B1 |
6837415 | Huang | Jan 2005 | B1 |
7228917 | Davis et al. | Jun 2007 | B2 |
20070074882 | Davis et al. | Apr 2007 | A1 |
20080190988 | Pedicini et al. | Aug 2008 | A1 |
Number | Date | Country | |
---|---|---|---|
20090057367 A1 | Mar 2009 | US |