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Патент USA US3023423

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March 6, 1962
' H. R. FISCHER ETAL
3,023,413
PORTABLE, AIR-OPERATED, MAGAZINE-FED NAILING MACHINE
Filed June 21, 1960
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ATTORNEY
March 6, 1962
H. R. FISCHER ETAL
3,023,413
PORTABLE, AIR-0PERATED, MAGAZINE-FED NAILING MACHINE
Filed June 21, 1960
3 Sheets-Sheet 5
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United States Patent 0 M
Patented Mar. 6, 1962
1..
2
3,023,413.
to place the hammerinto operation and with the hammer
resting upon the anvil,
FIG. 4 is an enlarged fragmentary vertical sectional
PORTABLE, AIR-OPERATED, MAGAZINE-FED
NAILING MACHINE
Howard R. Fischer and James A. Roberts, Utica, N.Y.,
View of the hammer exhaust control passage, similar in
section to FIG. 3,
FIG. 5v is. a vertical sectional view of the nailer body
and of the feed piston structure in full advanced to locate
assignors?to Chicago Pneumatic Tool, Company, New
York,
3,023,413
a corporation of New Jersey
FiledJune 21, 1960, Ser. No. 37,700
10?Claims. (Cl.- 1?-44.4)
the. point of the nail upon the work surface, preparatory
to the hammering action being effected,
?
Thisinvention relates to a portable, air-operated, maga 10
?FIG. 6 is a transverse sectional view of the nailing
zine-fed nailing machine.
It is the principal object of the present. invention to
provide a portable, air-operated, magazine-fed nailing
machine looking upon the top surface of the air distribut
ing plate and? as'viewed on line 6?-6 of FIG. 1,.
FIG. 7 is an enlarged transverse sectional? view of the
machine which uses nails of T-shape bonded together in
nailing machine, taken just below the distributing plate
strip? form and delivered from a, magazine, and wherein 15 and looking upon the laterally shiftable valve ring and
one nail will be taken at a time and driven fully into a
into the air supply and exhaust passages of theffeedv
work piece by merely locating the machine upon the
work piece and pulling the machine? trigger.
It is another object of the invention to provide in a
portable, air-operated, magazine-fed nailing machine, in
which T-shaped nails are Supplied in bonded strip form,
a driving blade assembly that? strips the individual nail?
from the bonded nail strip, advances the nail to the
surface of the work piece, has its hammering action auto
matically started thereupon and continues to? be advanced
piston structure that? serve to supply and exhaust air fromv
the hammer piston chamber therewithin, and as'viewed on
line 7-7 of FIG. 1,
20
machine at the upper end'thereof and taken through the
feed piston and- the automatic valve for controlling the
supply of air to the hammer piston cylinder, the view
25
as the nail is driven.
more particularly upon line 949 of FIG. 1,
30
I
'
FIG. 10 is an enlarged fragmentary vertical sectional
View looking upon: the trigger operated air supply valve
within. the handle, and the cutoff valve mechanism, the
nail, point has engaged the workpiece.
cutoff valve being in its closed position, and
It is still another object of the invention to provide a
portable, air-operated, magazine-fed nailing machine" in
?which a" combined feed ?piston and hammer assembly is
being taken on line 8??8 of FIG, 2,
FIG. 9 is a transverse sectional view of the nailing
machine at the lower end thereof and taken through the
driving blade and the automatic cutoff mechanism, and
It is still another object of the invention to provide an
air-operated, magazine-?fed, nailing machine that has'an
automatic control valve on the feed piston for controlling
the operation of the hammer piston in response to the
build up of air pressure against the feed piston when the?
" '
FIG. 8 is a transverse sectional view of the nailing
FIG. U is an enlarged fragmentary vertical sectional
35 view similar to FIG. 10 butwith the cutoff valve mecha
nism having been operated by the feed piston, and the
fully enclosed by. the machine body and themachine body
cutoff valve being in its open position.
serves as a connecting member for the support of the
Referring now to the ?gures, 15 represents a nailer
body in which there is a cylindrical chamber 16 and ex
the parts of the machine will be contained in one housing 40 tending laterally from the body is a valve handle 17. On
body.
the lower end of the nailer body 15 is a foot portion 18
other component parts of ?the machine, whereby
ofv
It is a further object of the invention to provide in
to the underside of which there is ?xed a nail magazine
an air-operated, magazine-fed nailing machine in which
assembly 19. A driving bladeyguidejZ'O; having 'a guide~
slot 21 is connected to the magazine by fastening bolts 22
the cycle. of operation of. the machine is ?started by a
trigger-operated air valve, an adjustable cutoff valve that
will automatically stop the machine when the nail has
45 and 23.
Nails N are T-shaped and are bonded together
to provide nail strips that can be supported?on a guide
been driven to its full extent or to a predetermined dis
way 24 within the magazine 19?. A nail strip follower
25 urges the nail'strip toward the blade guide 20? so that
?It is still a further, object? of the invention to provide
the forwardmost nail is delivered to the guide slot '21.
an air-operated, magazine-fed nailing, machine in ?when 50 The nail follower 25 is forced forwardly by a long tension
tance into the work.
>
the anvil is slidably retainedv in a bushing within the feed
piston structure and i'sicushioned in its blow and re
turned against the sleeve. by rubber ring cushioning means
?xed in the lower end of the feed piston structure.
Other objects of the invention are. to provide an air
operated, magazine-fed? nailing machine, having the above?
objects in'mind, which is of simple construction, has a
minimum number of parts, is compact, light in weight,
easy to load, maintain and ?handle,? ef?cient and effective
in use, and automatic in operation.
For a better understanding of the invention, reference
spring 27 that is connected ?to the follower and extended
over a forward pulley 28 and anchored to a projection
29 at the rear end of the magazine.
"
'
To insert the nails into the magazine, the follower 25
55
is pulled rearwardly and held in its rearward position by
raising a catch lock 30? into recess 31 in the magazine
housing. A door 32 is provided on the top of the maga
nine and when it is opened a nail strip may be loaded
into the magazine. These nails are vertically supported
60 upon ?the guideway 24- by their heads and held against
lateral displacement by side guide plates 33v and while
maybe ?had to the following detailed construction taken
being fed by the long tension spring 27 to the drive guide
in connection withthe accompanying drawing, in which
slot 21. When the door is c?losed,'the follower 25fis
FIGURE 1 is a vertical sectional view taken through.
released and pushes the leading nail of the strip? into slot
the nailing machine of the present invention with the feed 65 21 under a driving blade 34.
piston structure and the driving blade retracted,
Upon ?the upper end of the mailer body 15 over the
FIG. 2 is an enlarged vertical sectional view of the
cylindrical chamber 16;, there is secured by means of
top of the machine angled from the vertical section of
screw bolts 37 a reduced diameter feed piston chamber
FIG- 1,
extension cap 36 which serves as one hand grip for the
?FIG. 3 is an enlarged fragmentary, vertical sectional 70 machine. Slidable in the cylindrical chamber 116, is a
view of the ?intermediate part of ?the nailing machine simi
feed piston structure 38 that has a small diameter up
wardly-extending integral sleeve extension 39? that ex
lar in section to FIG. 2, with the feeding piston advanced
3,023,413
3
tends into a reduced diameter cylinder extension 41 pro
vided by the cap 36. Sealing rings 40 are provided on
the extension 39 to hold down air leakage to the main
portion of the feed piston chamber 16. This piston sleeve
extension 39 has a central passage 42 depending from
its upper end into a valve chamber 43' which is closed
4
diameter portion 87 of the valve stem, through the port
84 and be exhausted through the handle passage 86.
A trigger-operated arm 92 is pivoted Within a recess
93, extending upwardly from the underside of the valve
handle 17, by a pivot pin 94 and engages the forward end
of the valve guide stem 83 to open the valve 81 when a
trigger plunger 96 is pulled upwardly by a ?nger while
from the depending passage 42? by an inverted cup-shaped
grasping the handle 17. The trigger plunger carries a
automatic hammer control valve 44 supported in its
rounded end 97 of the pivot arm 92. to pivot the same,
closed position by a compression spring 45 resting upon
an air distributor plate 47 that is restrained therewithin 10 and cause its nose end 97' to engage the end of the stem
83 and the valve 81 to be lifted from its seat against the
the feed piston structure 38 by a depending piston skirt
action of the compression spring 79, FIG. 10. The ex
48 that is threaded tightly thereinto against the air dis
haust port 84 in the sleeve 82 will be closed by the valve
tributor plate 47 to support the distributor plate there
stem 83 and air entering the ?tting 78 passes the valve
within.
The upper end of the piston skirt 48' is relieved at the 15 81, the sleeve port 91 and into an air supply passage
98 running through the full extent of the handle. The
opposite sides to provide an elliptical projection 49 that
drillings for this passage 98 are closed by plugs 99 and
is surrounded by a ring valve 51 laterally shiftable with
101, one of these drillings leading from the valve sleeve
in side spaces 52 a?orded by the elliptical shape of the
port 91.
projection 49. This ring valve mechanism has been de
Within the inner part of the handle 17, is a vertically
scribed in detail in the Edward W. Stevens Patents 20
extending opening 103 that has a vertically-extending
1,860,964 granted May 31, 1932 and 1,931,041 granted
valve bushing 104 tightly ?tted therein. A cuto??. valve
October 17, 1933 whereby a cutaway of the opposite
plunger 105 operates in the valve bushing 104 and is
sides provide an elliptical transverse shape of the pro
held down by along compression spring 106 reacting
jection 49, so that the ring valve 51 can move laterally
?rst to close ports 53 in one side of the projection 49 25 against a stop plug 107 secured in the upper end of the
opening 103 by a sleeve pin ?107? and against the upper
and then ports 54 in the other side of the projection 49'.
end of ?a push rod 108. The push rod 108 extends down
The ring valve 51 alternatively shifts ?rst to one side
wardly
through a depending reduced diameter extension
and then to the other depending upon the direction to
109 of the valve bushing 104 and is held in place against
which a hammer piston 56 is to be moved within a piston
chamber 57. A key 59 holds the piston skirt 48 against 30 downward displacement by a stop pin 110 in the exten
sion 109 and engaging the upper end of an elongated
being unthreaded from the piston structure 38 and the
step recess 111 in the side of the push rod 108. The
air distributor plate 47 in place. The piston skirt 48
upward movement of push rod 108 is limited by the same
has a long key Way 61 that receives a key 62 projected
stop pin 110 upon being engaged by the push rod at the
inwardly from the nailer body 15 to hold the piston
lower
end of the elongated recess 111.
35
structure 38 against rotation while being Worked. The
When the cutoif valve plunger 105 is held down by its
feed piston is biased to its raised position by a return
compression spring 106 it is supported upon the push rod
compression spring 63 that engages the underside of the
108 and air from the supply passage 98 passes through
piston structure 38. This spring 63 surrounds the piston
a port 112 in the valve bushing 104, about annular groove
skirt 48 and reacts between a shoulder 64 in the lower
113 in the plunger valve 105, a port 114 in the opposite
end of the nailer body 15 and a shoulder 65 on the piston
skirt 48. The driving blade 34 is ?xed to an enlarged
lower end 66 of an anvil 67 that is slidably carried in
a sleeve bushing 68 tightly ?tted upwardly in the piston
skirt 48 against an internal shoulder 69.
side of the valve bushing 105 to a transverse passage 115
in the nailer body 15 and upwardly through a vertical pas
sage 116 to the top thereof. This passage 116 communi
cates past a sealing ring 116' with a passage 117 in the
In the lower end of the piston skirt 48, FIGS. 1 and 45 extension cap 36 extending upwardly in continuation
from the passage 116 and through a top port 118 into
3, there is provided cushioning ?means for the anvil 67
the feed piston chamber extension 41. The drillings pro
comprising a bottom retaining ring 71 ?xed by two pins
viding the passage 117 and the port 118 are closed respec
72 and 73 to the lower end of the piston skirt 48 that
tively by stop plugs 119 and 120 welded thereinto.
supports a rubber cushioning ring 74 ?and a metal wear
Air entering the the central passage 42 in the piston
50
ring 76 thereabove. The driving blade 34 extends down
sleeve extension 39 exerts a downard pressure against
wardly from the enlarged end 66 of the anvil through
the seated valve 44. This pressure is at this time insu?i
these rings and between the pins 72 and 73 and into the
cent to overcome the resistance of the valve 45, so that
drive guide nail dispensing slot 21. The anvil 67 is
the valve remains seated and the pressure of the air acting
bounced by the cushioning means after a hammer blow
upon
the valve 44 forces down the piston structure 38 to
into the sleeve bushing 68? and limited in its upward 55 place the pointed end of the nail N in contact with the
movement by the engagement of the enlarged end 66
work piece, FIG. 5, and continues the downward move
of the anvil with the lower end of the sleeve bushing 68.
ment of the feed piston 38 to maintain the hammering
In the valve handle 17 is a valve opening 77, FIG. 10.
action of the hammer piston upon the nail until it is
to which an air hose ?tting 78 is threadedly connected.
driven. Since the small hammer piston 56 is within the
60
This hose ?tting 78 has a valve compression spring 79
piston structure 38, both pistons are advanced. The
seated therein that normally holds a valve assembly 81
downard movement of feed piston structure 38 is against
the action of the return spring 63. The downward mo
the closed position upon the end of the sleeve 82, FIG. 1,
tion of the feed piston structure forces the driving blade
to prevent the passage of air through the valve bushing
82. The valve assembly 81 has a guide stem 83 that 65 34 through the guide slot 21 and strips the ?rst nail from
the bonded strip of nails and pushes the nail downwardly
is slidable in the valve bushing 82 and is adapted to
into contact with the work piece. The nail is held in the
cover when the valve 81 is lifted from its seat, an exhaust
vertical position in the guide slot 21 by the pressure from
port 84 in the sleeve 82, FIG. 10. This port 84 com
the succeeding nail of the bonded nail strip and the long
municates with an exhaust passage 86 that exhausts air
through the rear end of the handle to the atmosphere. 70 magazine tension spring 27.
When the nail point contacts the work piece surface,
The valve guide stem 83 has a reduced diameter portion
however, greater resistance is encountered and the air
87. Upon the valve 81 being released forwardly into
pressure is built up in the cylindrical chamber 16 above
the closed position upon the end of the sleeve 82, FIG. 1,
the feed piston structure 38 and in the central piston pas
air from the machine can be returned through a port
91 on the upper side of the sleeve 82? along the reduced 75 sage 42 of the piston feed extension 39 to open the ham?
3,023,413v
5
6
mer control valve 44 against the action of the compression
spring 45 and allow the air to enter the valve chamber
43 (FIG. 3). The control valve chamber 43 has four
radially-extending ports 122 from the outer ends of which
the air passes downwardly through respective vertical
force the control valve 44 upwardly into engagement
with its seat to close off the valve chamber 43 from the
central passage 42 in the piston extension 39. At this
point the hammer 56 ceases to operate. The piston struc
ture 38 is returned by compression return spring 63 as
passages 123 into an annular recess in the top of the air
the trapped air leaves through the exhaust passage 152 in
distributing plate 47. The air distributing plate 47, in
the extension cap 36.
Due to the threaded connection between the adjusting
nut 144 and the cutoff valve push rod 108, the point at
periphery of the distributing plate 47 whereby air will 10 which the cutoff valve is closed can be adjusted and the
be distributed to the opposite sides of the piston struc
point of travel of the driving blade 34 at which the ham
ture 38 and into the spaces 52 at the opposite sides of
mering stops and the blade ceases to be effective. Thus,
the upstanding elliptical projection 49 on piston skirt 48
by adjusting this nut 144 upon the push rod the nail heads
in which the ring valve 51 is shifted. The ring valve 51
can be driven flush with the work surface, countersunk
moves laterally to alternately supply air to the opposite 15 from the work surface or left projected slightly above
ends of the hammer piston chamber ?57 and thereby causes
the work surface.
the reciprocation of the hammer piston 56.
When the trigger 96 is manually released the valve
Air passes valve 51 and inwardly through ports 53 and
81 is closed by its spring 79 and the air is exhausted
downwardly through passages 128 at the one side of the
through the handle passage 86. The spring 106 forces
piston skirt 48 and inwardly through the ports 129? into 20 the cutoff valve 105 down until it contacts the push rod
the hammer piston chamber 57 to lift the hammer piston
108 which has been held in its raised position by the
56. Vertical exhaust passages 132 have vertically spaced
actuator 141. The feed piston 38 is raised and the ac
ports 133 and 134 and an intermediate exhaust port 135
tuator 141 then permits the push rod 108 to drop and
by which the exhaust air passes into the cylindrical cham
the control valve 105 returned to its lowered position
ber 16 of the nailer body 15 and outwardly through an 25 so that the nailing machine is made ready for the next
exhaust port 136 thereof to the atmosphere.
cycle of operation.
The hammer piston 56 thus serves as its own valve to
It should be apparent that there has been provided an
reverse the flow of air to the opposite sides of the hammer
effective automatic control valve to control the operation
piston to obtain the reciprocation thereof. As the ham
of the hammer piston in response to the delivery of the
mer piston 56 is lifted, the exhaust port 133 is closed 30 nail to the work piece by the feed piston structure and
by the piston itself and the lower exhaust port 134 is
an equally effective adjustable cutoff mechanism for auto
opened. The air above the hammer piston 56 is com
matically stopping the operation of the machine when
pressed su?iciently to displace ring valve 51 from the ports
the nail has been driven.
54 and allow the air then to pass from the ring space 52
While various changes may be made in the detailed
through the ports 54 into the top of the hammer cham 35 construction it shall be understood that such changes
ber 57 and reverse the movement of the hammer 56 so
shall be within the spirit and scope of the present inven
as to deliver a blow upon the anvil 67. The cycle of
tion as de?ned by the appended claims.
operation is automatically continued so that a series of
What is claimed is:
blows are delivered to the anvil to drive the nail N. The
1. In an air-operated, magazine-fed nailing machine,
hammer blows are transmitted from the anvil to the driv
a nailer body having a feed piston chamber therein, air
ing blade 34 and the entire piston structure advances
supply passages extending to the top of the feed piston
downwardly as the nail is driven since pressure continues
chamber, a feed piston structure operable in said feed
to be exerted on the top of the piston structure 38.
piston chamber, a return spring in the feed piston cham
When the feed piston structure 38 is advanced down
ber for biasing the feed piston to its retracted position,
ward to a point where the lower end of the piston skirt 48 45 said feed piston structure having a hammer piston cham
contacts a cutoff valve actuator 141 lying in a slot 140
ber therein, a hammer piston operable in the hammer
in the depending foot portion 18 of the nailer body 15,
piston chamber, an anvil in the hammer piston chamber
FIGS. 1, 5, 10 and 11, the cutoff actuator 141 is pivoted
adapted to be actuated by the hammer piston, 21 driver
on a pin 142 to the position shown in FIG. 11. On a
blade depending from the anvil and the feed piston struc
threaded lower end 143 of the push rod 108 is an adjust 50 ture, valve mechanism for operating the hammer piston,
able nut 144 with which the actuator engages. The down
a magazine for feeding nail strips, a driver blade guide
ward movement of the feed piston 38 thus causes the op
connected to the magazine and having a guide slot for
posite end of the actuator 141 to rise and engage with
receiving the driver blade and the nail from the maga~
the adjustable nut 144 which in turn forces the push rod
Zine, an air-operated control valve on the feed piston
108 and cutoff valve 105 upwardly against the action of 55 structure operable in response to the resistance of the
the valve compression spring 106 until a passage 145 in
nail upon the work to supply the air to the hammer pis
the sleeve bushing 104 is exposed, FIG. 11. At this point
ton valve mechanism, whereby upon air being extended
air from the supply passage 98 enters the bushing 104
to the feed piston chamber the nail is advanced so that
through the passage 145, takes over and forces the cutoif
its point engages the work surface before the hammering
valve 105 up against a stop plate 146, O-ring 147 and 60 action is effected by the opening of the control valve,
the stop plug 107. Some of the air entering the sleeve
and means responsive to a predetermined movement of
bushing 104 beneath the cutoff valve 105 bleeds through
the feed piston structure to shut off ?ow of air to the
a hole 149 in the valve 105 and outwardly through a hole
said air supply passages.
151 in the stop plug 107 to atmosphere. Since the pas
2. In an air-operated, magazine-fed nailing machine,
sage 145 passes more air than the hole 149, the cutoff 65 a nailer body having a feed piston chamber therein, air
valve 105 remains in its raised position so long as the
supply passages extending to the top of the feed piston
valve 81 is kept open by the trigger 96. In this position,
chamber, a feed piston structure operable in said feed
the valve 105 closes the bushing port 1174 to cutoff the
piston chamber, a return spring in the feed piston cham
?ow of air to the feed piston chamber 16, air is then
ber for biasing the feed piston to its retracted position,
trapped in the passages 115 and 116 in the nailer body 15, 70 said feed piston structure having a hammer piston cham
and in the feed piston chamber 16 and the hammer piston
ber therein, a hammer piston operable in the hammer
chamber 57. The hammer piston 56 delivers one or two
piston chamber, an anvil in the hammer piston chamber
more blows until enough air escapes through the hammer
adapted to be engaged by the hammer piston, a driver
blade depending from the anvil and the feed piston struc
exhaust ports 135 and 136 to lower the pressure in the
central passage 42 su?iciently to permit the spring 45 to
ture, valve mechanism for operating the hammer piston,
turn has four radially-extending passages 126 leading out
wardly into respective vertical notches 127 in the outer
3,023,413
7
a magazine for feeding nail strips, a blade guide. con
nected to the magazine and having a guide slot for re
ceiving the driver blade and the nail from the maga
zine, an air operated control valve on the feed piston
structure operable in response to the resistance of the
nail upon the work to supply the air to the hammer pis
ton valve mechanism, said feed piston structure having
a reduced diameter extension and said nailer body having
.
8
having been driven a predetermined distance into the
Work piece, and said nailer body having a foot portion
extending laterally therefrom, said foot portion having a
slot therein leading from the body chamber, said actua
tor extending into the body chamber to be actuated by
the feed piston and pivoted within said slot, and said push
rod having an adjustable nut thereon and engageable by
the outer end of said pivoted actuator, whereby upon air
being extended to the feed piston chamber the nail is ad
vanced so that its point engages the work surface before
piston extension, said piston extension having a central
the hammering action is effected by the opening of the
passage depending from its upper end thereof to said
control valve and the machine automatically stopped
hammer supply control valve so that the air that advances
when the nail has been driven.
the feed piston has access to the control valve, a spring
5. In an air-operated magazine-fed nailing machine
biasing said control valve upwardly into its closed posi
as
de?ned in claim 3, said cutoff valve being vertically
15
tion, whereby upon air being extended to the feed piston
movable and normally spring biased toward said push
chamber the nail is advanced so that its point engages
rod, an air passage leading from the one of said air
the work surface before the hammering action is effected
supply passages and normally closed by the cutoff valve,
by the opening of the control valve, and means respon
said push rod when lifted by the actuator adapted to lift
sive to a predetermined movement of the feed piston to
20 the cutoff valve above the air passage to let air entering
shut off ?ow of air to the said air supply passages.
the valve opening complete the lifting of the cutoff
3. In an air-operated, magazine-fed nailing machine,
valve, and air exhaust passages leading through the cut
a nailer body having a feed piston chamber therein and
off valve and the handle portion to the atmosphere,
a laterally-extending handle portion, air supply passages
said cutoff valve air passage passing more air than the
extending from the handle portion to the top of the feed
piston chamber, a feed piston structure operable in said 25 cutoff valve exhaust passages whereby to sustain the cut
off valve in its lifted position until air supply is shut off.
feed piston chamber, a return spring in the feed piston
6. In an air-operated, magazine-fed nailing machine, a
chamber for biasing the feed piston to its retracted posi
nailer body having a feed piston chamber therein, air
tion, said feed piston structure having a hammer piston
supply passages extending to the top of the feed piston
chamber therein, a hammer piston operable in the ham
mer piston chamber, an anvil in the hammer piston 30 chamber, a feed piston structure operable in said feed
piston chamber, a return spring in the feed piston cham
chamber adapted to be engaged by the hammer piston, a
ber for biasing the feed piston to its retracted position,
driver blade depending from the anvil and the feed pis
said feed piston structure having a hammer piston cham
ton structure, valve mechanism for operating the ham
ber therein, a hammer piston operable in the hammer pis
mer piston, a magazine for feeding nail strips, a blade
guide connected to the magazine and having a guide slot 35 ton chamber, an anvil in the hammer piston chamber
adapted to be actuated by the hammer piston, a driver
for receiving the driver blade and the nail from the
blade depending from the anvil and the feed piston
magazine, an air-operated control valve on the feed pis
structure, the piston structure, hammer piston, anvil, and
ton structure operable in response to the resistance of
driver blade having a common longitudinal axis, valve
the nail upon the work to supply the air to the hammer
mechanism for operating the hammer piston, a magazine
piston valve mechanism, a cutoff valve mechanism in the
for feeding nail strips, a driver blade guide connected
air supply passages of the handle portion, a depending
to the magazine and having a guide slot for receiving
push rod for operating said cutoff mechanism, and an
the driver blade and the nail from the magazine, and
actuator carried on the nailer body and engageable by
an air-operated control valve on the feed piston struc
said feed piston structure and engaging said push rod
upon the nail having been driven a predetermined dis 45 ture operable in response to the resistance of the nail
upon the work to supply the air to the hammer piston
tance into the work piece, whereby upon air being ex
valve mechanism, and hammer valve mechanism on
tended to the feed piston chamber the nail is advanced
the piston structure including an air distributor plate
so that its point engages the work surface before the
and a piston skirt retained within the piston structure,
hammering action is effected by the opening of the con
trol valve and the machine automatically stopped when 50 said piston skirt having a projection providing spaces
at the opposite sides thereof, a laterally shiftable ring
the nail has been driven.
valve shiftable upon the projection, and supply ports
4. In an air-operated, magazine-fed nailing machine,
running through the piston skirt to feed air to the upper
a nailer body having a feed piston chamber therein and
and lower sides of the hammer piston chamber, and
a laterally-extending handle portion, air supply passages
extending from the handle portion to the top of the feed 55 exhaust port means in the piston skirt and operable by
said hammer piston and in cooperation with the ring
piston chamber, a feed piston structure operable in said
valve to effect the reciprocation of the hammer piston,
feed piston chamber, a return spring in the feed piston
whereby upon air being extended to the feed piston
chamber for biasing the feed piston to its retracted posi
chamber the nail is advanced so that its point engages
tion, said feed piston structure having a hammer piston
chamber therein, a hammer piston operable in the ham 60 the work surface before the hamering action is effected
by the opening of the control valve.
mer piston chamber, an anvil in the hammer piston
a reduced diameter chamber extension for receiving the
chamber adapted to be engaged by the hammer piston,
7. In an air-operated, magazine-fed nailing machine,
a driver blade depending from the anvil and the feed
a nailer body having a feed piston chamber and a later
ally-extending handle portion, air supply passages ex
piston structure, valve mechanism for operating the ham
mer piston, a magazine for feeding nail strips, a blade 65 tending from the handle portion to the top of the feed
piston chamber, a feed piston structure operable in said
guide connected to the magazine and having a guide slot
feed piston chamber, a return spring in the feed piston
for receiving the driver blade and the nail from the maga
chamber for biasing the feed piston to its retracted posi
zine, an air-operated control valve on the feed piston
tion, said feed piston structure having a hammer piston
structure operable in response to the resistance of the
nail upon the work to supply the air to the hammer pis 70 chamber therein, a hammer piston operable in the ham
ton valve mechanism, a cutoff valve mechanism in the
air supply passages of handle portion, a depending push
rod for operating said cuto?c mechanism, and an actuator
mer piston chamber, an anvil in the hammer piston
chamber adapted to be engaged by the hammer piston,
a driver blade depending from the anvil and the feed
piston structure, valve mechanism for operating the
carried on the nailer body and engageable by said feed
piston structure and engaging said push rod upon the nail 75 hammer piston, a magazine for feeding nail strips, a
3,023,413
10
blade guide connected to the magazine and having a
guide slot for receiving the driver blade and the nail
from the magazine, and an air operated control valve
on the feed piston structure operable in response to
the resistance of the nail upon the work to supply the
air to the hammer piston valve mechanism, said feed
piston structure having a reduced diameter extension
and said nailer body having a reduced diameter cham
point engages the work surface before the hammering
action is effected by the opening of the control valve,
and air out off means in the air supply passages actuable
by the skirt of the piston structure to shut off ?ow of
air through said passages upon the piston structure mov
ing a predetermined distance in the direction of the nail.
9. In a ?uid powered nailing machine including a hous
ing having a main piston chamber, a main piston operable
ber extension for receiving the piston extension, said
in this chamber and carrying a nail driver element for en
piston extension having a central passage depending from 10 gagement with a nail that is to be driven into a workpiece,
its upper end thereof to said hammer supply control
a return spring biasing the main piston to a returned initial
valve so that the air that advances the feed piston has
position, a piston cylinder de?ned within the main piston,
access to the control valve, and a spring biasing said
the driver element having an upper portion thereof in the
control valve upwardly into its closed position, said air
lower end of the piston cylinder, a hammer piston recipro
supply passages extending through the handle portion, 15 cable in the piston cylinder for pounding the said upper
the mailer body and the reduced-diameter chamber ex
tension, a control valve in the handle air passage, a
trigger means for operating the air control valve pro
vided on the handle portion and cut on valve means in
portion of the driver element, and valve mechanism for
alternately applying operating pressure ?uid to opposite
ends of the piston cylinder to reciprocate the hammer pis
ton; control means initially causing pressure ?uid to be
said handle passage and operable by the feed piston 20 applied to the main piston to move the latter against the
structure when the nail has been driven a predetermined
spring so as to carry the driver element against the nail
distance, whereby upon air being extended to the feed
piston chamber the nail is advanced so that its point en
gages the work surface before the hammering action is
effected by the opening of the control valve.
8. In an air-operated, magazine~fed nailing machine,
a mailer body having a feed piston chamber therein, air
supply passages extending to the top of the feed piston
chamber, a feed piston structure operable in said feed
piston chamber, a return spring in the feed piston cham
ber for biasing the feed piston to its retracted position,
said feed piston structure having a hammer piston cham
ber therein, a hammer piston operable in the hammer pis
to be driven, and for subsequently causing in response to
a predetermined resistance of the nail to the driven ele-'v
ment pressure ?uid to be applied simultaneously to the
main piston to press the driver element continuously
against the nail and to be applied to the valve means to
effect reciprocation of the hammer piston, and air shut o??
means responsive to a predetermined movement of the
driver element subsequent to its engagement with the nail
to cut off the ?ow of pressure ?uid to the machine.
10. In a ?uid powered machine for driving a rigid linear
element into an object, including a main piston carrying a
driving member for driving the rigid element, the main
piston being movable to carry the driving member linear
adapted to be engaged by the hammer piston, a driver 35 ly into abutment with the rigid element, a reciprocable
blade depending from the anvil and the feed piston struc
hammer piston for pounding the driving member; means
ture, valve mechanism for operating the hammer piston,
for initially causing pressure ?uid to be applied to the
a magazine for feeding nail strips, a blade guide con
main piston to carry the driving member into abutment
nected to the magazine and having a guide slot for re
with the rigid element, and for subsequently acting in re
ton chamber, an anvil in the hammer piston chamber
ceiving the driver blade and the nail from the magazine,
sponse to a predetermined resistance of the rigid element
to the driving member to cause operating pressure ?uid
to be applied to the main piston to hold the driving mem
an air-operated control valve on the feed piston struc
ture operable in response to the resistance of the nail
upon the work to supply the air to the hammer piston
ber in pressed abutment with the rigid element and simul
taneously with the latter application to cause pressure
valve mechanism, said piston structure including a de
pending skirt, a vertically-extending bushing retained
in said piston skirt against upward displacement, said
anvil being vertically slidable in said bushing, said anvil
45
?uid to be applied alternately to opposite ends of the
hammer piston to reciprocate the latter; and means re
sponsive to a predetermined linear movement of the driv
having an enlarged bottom head and engageable with
ing member subsequent to its abutment with the rigid
the lower end of said bushing to limit its upward move
element to shut off ?ow of pressure ?uid to the machine.
ment, said driver blade depending from the enlarged bot 50
tom head of the anvil, an annular retaining ring ?xed
References Cited in the ?le of this patent
within the lower end of the depending piston skirt, cush
UNITED STATES PATENTS
ioning ring means supported by said retaining ring and
963,924
McSherry ____________ __ July 12, 1910
engageable by the enlarged bottom head of the anvil to
2,546,354
Bacon _______________ __ Mar. 27, 1951
cushion the blow and return the anvil preparatory to 5
2,648,841
Smith _______________ __ Aug. 18, 1953
the next blow, whereby upon air being extended to the
feed piston chamber the nail is advanced so that its
2,857,596
Allen _______________ __ Oct. 28, 1958
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