# Patent

## Title
Pneumatic staple or nail gun with dual trigger mechanism

## Abstract

An improved apparatus for nailing or stapling flooring pneumatically, wherein a pneumatic stapler or nailer is provided with a dual trigger single sequential actuation system by which an operator can reach either trigger with his index finger. In one embodiment, the triggers being interconnected. In a second embodiment, each trigger actuates a valve that communicates with a pneumatic piston which drives the staple.

## Background
CROSS REFERENCE TO RELATED APPLICATION
This application claims the benefit of U.S. Provisional Application No. 61/274,341, filed Aug. 18, 2009.
FIELD OF THE INVENTION
The present invention relates to an apparatus for installing tongue and groove, wood or engineered flooring, and particularly to pneumatic staple or nail gun apparatus, hereinafter “stapler”, for quick and accurate stapling or nailing of flooring members into place. The apparatus includes primary and secondary triggers which perform the same function, but allow ready access to a trigger regardless of the orientation of the stapler with regard to the user.
BACKGROUND OF THE INVENTION
During the installation of flooring, it is often necessary for a pneumatic staple gun operator to assume a position from which it is extremely difficult to reach the actuating trigger easily or comfortably by an index finger, the normal trigger finger, or to use the staple gun in an orientation where it is difficult to reach the trigger to activate the stapler. No known device addresses this problem. Heretofore, there has been no suitable device that will allow ease of actuation when the stapler is operated in an inverted position.
SUMMARY OF THE INVENTION
The invention provides apparatus which incorporates a dual trigger single sequential actuation system in a pneumatic staple or nail gun. The invented device, known as a Twin Trigger pneumatic stapler, has a first trigger in the normal position for actuation of the stapler, and a secondary trigger interconnected to the first trigger, whereby actuation of the secondary trigger will actuate the stapler through the first trigger. The two triggers can be interconnected by a flexible cable, or they can be connected pneumatically to one or more actuating valves. The invented tool also includes a sequential safety trip apparatus.
Ordinarily, when a stapler is utilized in a direction which places the trigger in a position where it must be activated by the weakest finger on the operator's hand, it is difficult to operate easily and over long periods of time. The invented Twin Trigger stapler places a trigger in reach of an operator's index finger regardless of the position in which the stapler is operated.
The present invention is particularly useful for installing solid and laminate flooring, as well as tongue and groove flooring.
OBJECTS OF THE INVENTION
The principal object of the present invention is to provide an improved pneumatic stapler apparatus that can be easily operated in any orientation.
Another object of the invention is to provide apparatus for stapling flooring which reduces fatigue of the operator.
It is also an object of the invention to provide improved ergonomics in a pneumatic stapler apparatus.
It is another objection of the invention to provide improved stapler apparatus that can readily be actuated when the operator is positioned either in front of or behind the stapler tool.
It is another object of the invention to provide a pneumatic stapler apparatus that enables the user to always have his trigger finger in the most comfortable position for trigger activation.
It is also an object of the invention to provide a dual-trigger pneumatic stapler tool with a sequential safety trip apparatus.



BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing and other objects will become more readily apparent by referring to the following detailed description and the appended drawings in which:
FIG. 1 is a side view of the invented Twin Trigger stapler.
FIG. 2 is a longitudinal cross sectional view of the invented Twin Trigger stapler showing one embodiment thereof.
FIG. 3 is a side view of the invented Twin Trigger Stapler with an operator's index finger operating the normal actuating trigger.
FIG. 4 is a side view of the invented Twin Trigger stapler with an operator's index finger operating the secondary trigger.
FIG. 5 is a longitudinal cut-away view of an alternative Twin Trigger Stapler apparatus utilizing actuating valves.
FIG. 6 is an exploded view of the Twin Trigger Stapler embodiment of FIG. 1.



DETAILED DESCRIPTION
Referring now to the drawings, and particularly to FIG. 1, the invented stapler device S includes a primary actuating trigger 30 in the normal position for similar pneumatic staple guns. A flexible monofilament cable 16 (in FIG. 2 and FIG. 6) is attached to the primary trigger through trigger plate 32. The cable is positioned in a slot in trigger cable cap 68 (see FIG. 6). The cable may pass through a channel that is cast into the handle 24 of the stapler S. The opposite end of the cable is attached to a secondary trigger 67. A series of pulleys or guide rolls 35, 39 are provided as shown to guide the movement of the cable and prevent it from binding.
The body of the stapler, including the handle is preferably cast aluminum, and may be provided with a slot which mates with cable cap 68 to provide a channel in which the cable 69 can operate, and by which it is protected.
The secondary trigger 67 is mounted as shown in FIGS. 1 through 4 and 6.
The secondary trigger 67 is utilized as shown in FIG. 3 when the staple gun S is in the reverse position or in any position with the primary trigger 30 near the heel of the operator's hand. Because of the cable 69 connection, actuation of the secondary trigger 67 will actuate the stapler through the first trigger 30. The installer is positioned in front of the flooring with the stapler in stapling position. The secondary trigger enables the installer to activate the gun using his index or trigger finger. This puts the installer in a comfortable and precise stapling position. If the installer prefers to position himself behind the tool then the conventional trigger is used for optimum precision and comfort.
A compressed air power source P is provided for operation of the stapler, which is pressure-regulated.
During normal operation, a contact safety in the nose of the stapler is depressed by contacting it to the workpiece. This causes movement of the trigger plates 32, allowing the triggers to be pulled, and either of the two triggers are pulled to actuate the stapler, which causes a staple to be stripped from the magazine 63 and be driven into and through the workpiece. A trigger is pulled once for each subsequent actuation.
As shown in alternative embodiment of FIG. 5, the tool incorporates a sequential trip contact safety in which a safety arm 90 extends from the front guide 55 terminating at trigger plate 32 associated with each trigger 30, 67. The sequential trip system requires the operator to hold the front guide of the tool against the work surface before pulling the trigger. The safety arm 90 A of the tool must be depressed by placing the tool against the work surface or flooring. Depressing the safety arm 90A pushes safety arm 90B upward against both trigger plates 32. This places both trigger plates 32 in the “up” position so that when the associated trigger is pulled, contact is made with the valve stem 94 of valve 92 to open the valve to the pneumatic chamber to actuate the tool a single time. The secondary trigger operates in the same manner. The operator can select either trigger to actuate the pneumatic staple gun, as desired. This alternative device does not use a cable. The safety arms 90A and 90B are preferably made of aluminum.
In a typical flooring application, the installer is positioned in front of the flooring with the stapler in stapling position. The secondary trigger enables the installer to activate the gun using his index of trigger finger. This puts the installer in a comfortable and precise stapling position. If the installer prefers to position behind the tool then the primary trigger is used for optimum precision and comfort.
For the purpose of completeness, the following reference number list refers to all items in FIG. 6.
















 1
screw



 2
cap



 3
gasket, cap



 4
top seal



 5
poppet



 6
o-ring



 7
o-ring



 8
head valve spring



 9
head valve



10
cylinder top seal



11
cylinder



12
o-ring



13
cylinder ring



14
o-ring



15
o-ring



16
piston



17
pin



18
driver blade



18U
piston/driver blade assembly



19
bumper



20
guide driver



21
pin retainer



22
body



23
nut



24
grip



25
handle gasket



26
handle cap



27
screw



28
air plug



29
plug cap



30
primary trigger



31
spring pin



32
trigger plate



33
trigger pin



34
pin



35
roller



36
o-ring



37
screw



38
pin



39
roller



40
pin



41
o-ring



42
trigger valve plunger



43
trigger valve spring



44
trigger valve stem



45
o-ring



46
o-ring



47
trigger valve housing



47U
trigger valve unit



48
hold plate



49
screw



50
spring



51
arm guide



52
spring



53
safety arm



54
screw



55
front guide



56
arm cover



57
safety arm



58
nose insert



59
nose



60
driver plate



61
foot



62
knob



63
magazine



64
stop plate



65
screw



66
plate



67
secondary trigger



68
trigger cable cap



69
trigger cable



70
magazine core



71
pusher



72
magazine, slide



73
spring pin



74
spring pin



75
latch



76
latch



77
latch cover



78
latch stop



79
core tip



80
spring



81
shuttle, pusher



82
pusher spring



83
magazine bumper



84
washer










SUMMARY OF THE ACHIEVEMENT OF THE OBJECTS OF THE INVENTION
From the foregoing, it is readily apparent that I have invented an improved pneumatic stapler apparatus for high speed, high volume installation of wooden flooring, particularly where it is necessary to orient the stapler apparatus in a position where it would be difficult or uncomfortable to activate it by reaching the trigger, by providing a multiple trigger on the stapler in at least two locations, one of which is easy to reach with a trigger finger regardless of orientation of the apparatus at the time, and by providing an improved pneumatic stapler apparatus that can be easily operated in any orientation, that can readily be actuated when the operator is positioned either in front of or behind the stapler apparatus, that enables the user to always have his trigger finger in the most comfortable position for trigger activation. the use of which reduces fatigue of the operator, and provides improved ergonomics.
It is to be understood that the foregoing description and specific embodiments are merely illustrative of the best mode of the invention and the principles thereof, and that various modifications and additions may be made to the apparatus by those skilled in the art, without departing from the spirit and scope of this invention.

## Claims

1. A pneumatic tool for stapling floor elements, having a handle, a staple driver, an actuating trigger positioned in said handle, and a secondary trigger positioned in said handle spaced from said actuating trigger, a pair of actuating valves connected to a pneumatic cylinder for actuation thereof, said actuating trigger being connected to a first of said pair of valves, and said secondary trigger being connected to a second of said pair of valves, whereupon pressing of either trigger actuates the valve, and initiates operation of the tool, the tool further comprising a sequential trip system having a safety arm connected to an associated trigger plate of each of said triggers and extending from said trigger plates to said tool adjacent said staple driver, wherein pressing said safety arm against a work surface allows actuation of either trigger.

2. A tool for stapling floor elements, having a handle, a staple driver, an actuating trigger positioned in said handle, and a secondary trigger spaced from said actuating trigger, said actuating trigger being connected to said secondary trigger by a flexible cable, the cable passing through the handle of the tool, said cable passing over and being guided by a series of pulleys, whereupon pressing of either trigger actuates the actuating trigger and the staple driver, the tool further comprising a sequential trip system having a safety arm for exerting a force on an associated trigger plate of each of said triggers and extending from said trigger plates to said tool adjacent said staple driver, wherein pressing said safety arm against a work surface allows actuation of either trigger.

3. A tool according to claim 1 wherein said handle is provided with a slot or channel and said cable is positioned in said channel.

4. A tool according to claim 1 wherein said cable is a flexible monofilament.

5. A tool for stapling floor elements, having a handle, a staple driver, an actuating trigger positioned in said handle, and a secondary trigger spaced from said actuating trigger, said triggers connected pneumatically to one or more actuating valves whereupon pressing of either trigger actuates the actuating trigger and the staple driver, the tool further comprising a sequential trip system having a safety arm for exerting a force on an associated trigger plate of each of said triggers and extending from said trigger plates to said tool adjacent said staple driver, wherein pressing said safety arm against a work surface allows actuation of either trigger.

6. A tool according to claim 5 wherein said handle is provided with a slot or channel and a cable is positioned in said channel.

7. A tool according to claim 6 wherein said cable is a flexible monofilament.