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Nov. 13, 1962
'
E. 1. FISHER
"
3,063,421
FASTENER APPLYING IMPLEMENTS
Original Filed March 22, 1960
2 Sheets-Sheet 1
INVENTOR.
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EdzdMZJZZ-s?ar
BY
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ATTORNEYS
Nov. 13, 1962
E. 1. FISHER
3,063,421
FASTENER APPLYING IMPLEMENTS
Original Filed March 22, 1960
2 Sheets-Sheet 2
R
INVENTOR.’
Bylz’zhz-JZW
ATTORNEYS ‘I
United States Patent O?lice
3,%3,4Zl
Patented Nov. 13, 1962
2
1
FIG. 2 is a similar sectional view of the fore part of
3,063,421
FASTENER APPLYING IMPLEMENTS
Edward I. Fisher, Westerly, R.I., assignor to Bostitch,
Inc., East Greenwich, R.I., a corpnration of Rhode
Island
Original application Mar. 22, 1960, Ser. No. 16,7ti2.
Divided and this application Mar. 29, 1961, Ser. Na.
99,186
3 Claims. (Cl. 121-—3)
This application is a division of my prior application
Serial No. 16,702 ?led March 22, 1960, for Improve
ments in Piston-Actuated Fastener Applying Machines
and Implements.
The present application relates to adjustable connect
ing means between the piston and fastener-driver for al
tering their relationship to vary the effective length of
the driver for driving fasteners of different lengths. In
most machines ofthe prior art it is necessary to open
the casing of the machine to gain access to the means
for adjusting the relationship between the driver and
piston to render it capable of driving fasteners of differ
ent lengths.
One object of the present improvement is to provide
adjustable connecting means between the piston and
driver accessible from the outside of the machine so
that the necessary adjustment may be accomplished with
out opening the casing of the machine or disassembling
any parts of its mechanism.
Another object is to provide adjustable connecting
means between the piston and driver conveniently acces
sible from the outside of the machine without removing a
the implement showing the piston depressed and the
driver at the end of its stroke with the trigger-operated
valve open for exhausting pressure from the bottom of
the cylinder;
R6. 3 is a transverse sectional plan view on line 3—‘3
of FIG. 1 illustrating the detent-means for locking the
adjusting means in ?xed relationship;
FiG. 4 is a transverse sectional plan view on line 4-—4
10 of FIG. 1 with the locking means for the adjusting means
illustrated in detail; and
FiG. 5 is a bottom plan view of the base of the ma
chine head on line 5-5 of FIG. 1 showing the gland
through which the driver-blade slides.
While the present invention is herein illustrated and
described as applied to uselin a portable, pneumatically
operated machine, it is to be understood that it may be
embodied in other, structures such as avmanually-opera
ble implement in which the driver-blade'is connected
to a slidable plunger; or a stationary machine mounted
on a suitable base or standard. The present implement
may be employed in many different industries, for exam
ple: to drive fasteners for attaching the parts of auto
mobile bodies; for fastening covers to boxes and cartons;
tacking or nailing sheathing and roo?ng to buildings; and
for fastening together numerous other articles and ob
jects.
As herein illustrated, the implement is generally of
conventional design comprising a casing A embodying
a head H containing the operating mechanism and sur
mounting the forward end of a magazine M of usual
construction for supplying inverted U-shaped fasteners.
such as wire staples S. The forward end of the magazine
M may be connected to the base of the head H by any
of the parts of the machine.
Another object is to provide an improved construction 35 suitable means, being shown as constructed with a nose
piece N having a slotted raceway or guideway 11 in
of screw-threaded connecting means between the piston
which the staple-driver D reciprocates. The nosepiece
and driver which is accessible from the outside of the
N may be formed with a bifurcated bracket T having
casing to effect relative displacement between said ele
lateral ?anges F at the top abutting a closure plate P
ments for adjusting the extent of stroke of the driver.
Another object is to provide an improved construc 40 fastened to the base of the head H of the casing A.
The head H is initially left open at the bottom for as
tion of the adjustable connecting means which requires
sembling the operating mechanism of the machine there
relatively few elements of simple construction applied
cap, cover or other closure member or disassembling any
to the driving means of the machine.
While the invention is herein disclosed as applied to
- use with a power-driven stapling machine, it is to be
understood that the present improvements may be adapted
for use with manually-operated stapling appliances. As
shown in my prior application from which the present
in and the plate P may be fastened to its base by screws
1‘ (FIGS. 1, 2). The magazine M extends rearwardly
from the nosepiece N and may be of U-shape in cross
section formed of sheet-metal folded to provide a hol
low‘ structure. Fastened within the magazine M is a
longitudinally-extending core or rail C on which the
staples S are mounted to slide forward for feeding the
a stapling machine driven by pressure ?uid as described 50 foremost staple of the series into the guideway n through
application is divided, the present invention is applied to
briefly herein; reference being had to the prior pending
which the staple-driver D slides.
application for a more detailed description of the com
of usual construction is slidably mounted on the core C
A staple-pusher I
to be urged forward by a suitable spring (not herein
shown) for advancing the staples to deliver them singly
ment are set forth in the following speci?cation, or will 55 to the driving means; these last-named elements of the
machine not being described in detail herein as they form
be obvious to those skilled in the art; it being under
no part of the present invention.
stood that the present disclosure is by way of example
The main casing A of the machine may be constructed
only to illustrate a preferred embodiment of the inven
as a casting comprising the hollow head H containing
tion as shown by the accompanying drawings. In the
plete machine.
Further objects and advantages of the present improve
drawings:
FIG. 1 is a side 'elevational view of the complete im
plement, part-sectional in a plane intersecting the verti~
cal axis of the machine and showing the driving piston
as raised to its uppermost position;
60 an integrally cast cylinder 2 having an open top.
The
upper portion of the head H forms a generally ?aring
interior chamber 3 constituted as a reservoir for pressure
?uid. The walls of the chamber 3 in the head H are
continued rearwardly in the form of a hollow handle 4
3,063,421
at?
by which the implement may be grasped for transport
adapt it to engage therewith for limiting the turning of
the piston in the bore of the cylinder 2.
pressed air or other pressure ?uid may be supplied to the
For rotating the piston 7 about its axis in the cylinder
reservoir 3 in the head H by connecting the end of the
2 to adjust the vertical extent of projection of the driver
handle 4 to a hose 12 leading from a suitable source there UI D relatively thereto, manually-operable means may be
of. The interior of the handle 4 opens into the pressure
provided available above the top of the head H. As
ing it and holding its nose N against the work.
Com
chamber 3 in the head H through an ori?ce 5 of rela
herein illustrated one form of such adjusting means may
consist in a knurled knob or disk 30 adapted to be gripped
tively large area so that constant pressure may be main
tained within said chamber.
The upper open end of the cylinder 2 is ?anged in
wardly at 8 and formed with an interior groove 3 in
which is mounted a sealing gasket 10. The cylindrical
piston 7 is of hollow construction, open at the top and
closed at the bottom by a relatively thick wall 11. The
bottom wall 11 of the piston 7 is shouldered on the out
side at 12 to project outwardly for increasing its lower
area and thus provide a differential relationship with the
it. As herein shown a stud 32 projects from the under
side of the disk ‘30 by which it is rotatively mounted in a
bore 33 in the top of the head H. The stud 32 may be
secured to the ?nger-grip or disk 30 by its reduced knurled
end 33' (FIG. I) forced into a bore therein. Held in a
slot in the periphery of the stud 32 is a ?exible gasket 34
engaging the interior of the bore 33 for sealing the joint
therebetween. The lower end of the stud 32 is formed
area on its upper surface.
A groove 13 formed in the
with a disk-like head 35 engaging in a ?nished recess 36
periphery of the projecting portion 12 of the wall 11 has
a ?exible gasket 14 held therein. A second gasket 15
on the under side of the top wall of the head H.
A thin metal strip or bar 37 is held in a transverse
slot on the'under side of the head 35 with its ends pro
in the ?ngers and engaged with the piston 7 for turning
mounted above the projecting rim 12 at the bottom of the
piston 7 seats against the shoulder of the enlargement so
that both gaskets are in sliding contact with the inner
wall of the cylinder 2 to form a seal between the piston
jecting radially therefrom to provide a key~like wrench
for engagement with the piston 7. The projecting ends
of the bar 37 are adapted to engage in pairs of diametri
cally opposed slots 40-40 and 41—41 (FIG. 3) in the
upper rim of the piston 7 to provide for turning the latter
about the screw-threaded stud 20 to adjust the vertical
relationship between the driver D and the piston; that is,
for either increasing or decreasing the extent of projec
tion of the driver and the position of its lower driving
edge below the piston. It is obvious that the driver-blade
D will be prevented from turning when the piston 7 is
and cylinder.
For di?erent kinds of work requiring staples of greater
or lesser length it has usually been the practice to adjust
the connection between the driver blade and piston for
changing their relationship so as to regulate the extent
of the driving stroke of the driver for inserting staples
of certain length to the proper depth in the work. It will
be obvious that for driving relatively large staples with
long legs the stroke of the driver must be continued to an
extent equal to or even slightly greater than the length of
the staple legs. Consequently, the driver must be ad
rotated due to its engagement with the sides of the throat
n in the nosepiece N.
To relieve shock and jar on the piston 7 as it descends
in a driving stroke a resilient washer or bumper 50 is
disposed in the bottom of the cylinder 2 seated on the
justed to project below the piston in proportion to the
maximum extent required. On the other hand, for
shorter staples the extent of projection of the driver be
low the piston is reduced by adjusting the driver in its
connection to the piston dependent upon the type of work
closure plate P.
The bumper 50 may be constructed of
rubber or other suitable resilient material with a central
slotted opening 52 in alinement with a slot 53 in the plate
P through which the driver slides. The opening 52 at the
center of the bumper 50 is enlarged at the top and
formed with a relatively deep lip 55 (FIGS. 1, 5) sur
and the size of the staples being used. In practically
all machines now in use adjustment of the connection be
tween the staple-driver and piston to regulate the e?ec
tive length of the driver has only been possible by opening
the casing of the machine and disassembling parts of its
driving means. In the present improved construction,
rounding the driver-blade D and having its marginal edge
however, the head of the machine may be closed after
the operating parts have been assembled therein and
means conveniently accessible from the outside of the
machine provide for adjusting the driver-blade vertically '
in relation to the piston without opening the casing. The
novel and ingenious means for e?ecting this advantageous
The operation of the above described means for adjust
ing the connection between the driver blade D and the
piston 7 is explained as follows: Assuming the piston 7
to be at the upper end of its stroke as shown in FIG. 1,
the ?nger-knob or disk 30 will normally be raised with
its key or wrench bar 37 above the slots 40 and 41 in the
result are constructed and arranged as next described:
The staple-driver D is in the form of a ?at metal blade
provided at the top with a transverse enlargement or
upper end of the piston. By simply pressing the disk 30
downward the ends of its key 37 may be engaged with
cylindrical bead 16 engageable in a drilled hole 17 dia
metrically bisecting a screw-threaded plug or stud 20.
The stud 20 is screwed into a bore 21 in the bottom wall
11 of the piston 7 with the ?at portion of the driver
engaging in a slot 22 below the hole 17. By the present
improved construction relative turning motion between
the piston 7 and the stud 20 will effect micrometer ad
justment of the driver-blade D by small increments or
decrements to lower or raise its driving end in relation to
the piston.
The threated stud 20 is formed with a disk-like head
23 connected to its upper portion by a square neck 24
(FIGS. 1, 4). The neck 24 of the plug 20 provides
means cooperating with a hairpin-shaped pawl 25 ar
ranged with its legs resiliently engaging opposite ?at sides
of the neck to act as detent-means for preventing unwar
ranted rotary movement of the piston 7 with respect to
the driver-blade D. A relatively long pin 26 held in a
drilled hole in the bottom wall 11 of the piston 7 projects
upwardly therefrom between the legs of the pawl 25 to
impinging resiliently thereagainst to provide a leak-proof
g and.
either pair of slots 40-40 and 41-41 in the upper rim
of the piston 7; it being observed by reference to FIG. 3
that said slots are of somewhat greater extent than the
width of the key 37 to render it convenient for engaging
the key therein. For example, even though neither pair
of slots may be in alinement with the ends of the key 37,
a slight turning movement of the ?nger-knob 30 will
locate the key for engagement with one pair of slots as
it is pressed downwardly by the operator. After the key
37 has been entered in the slots 40—40 or 41-41, as the
case may be, the piston 7 may be rotated by the knob 30,
either clockwise or counter-clockwise, to a su?icient ex
tent to eifect the desired adjustment for raising or lowering
the driver-blade D with respect to the piston 7. As the
piston 7 is rotated the pin 26 in its interior will engage one
or the other of the legs of the pawl 25 to swing the latter
around until its legs come into engagement with certain
of the opposite sides of the square neck 24 of the stud
20. With the adjustment completed the pawl 25 will act
as detent~means to prevent unwarranted turning of the
75 piston 7 in the cylinder 2; although a limited amount of
3,063,421
5
6
rotative motion of the piston may be permitted during
engageable with said piston being manually operable
its reciprocation as usually considered desirable to pre
through an arc of from 90° to 360°, or even throughout
several turns to effect the desired extent of relative verti
from above the top of said head.
2. In a fastener applying machine, ‘a casing having a
head, ‘a pressure chamber in the upper part of said head, a
cylinder located below said pressure chamber and open
at the top ‘for communication therewith, a piston re
cal adjustment between it and the driver-blade D. In
any case, the preferred practice is to rotate the piston
until the opposite legs of the pawl 25 snap into engage
ment with certain of the opposed ?at sides of the neck 24 10
said piston, screw-threaded means connected to said driver
and engaging a threaded bore in said piston, and rotatable
means at the top of the head manually operable for ef
vent undue wear.
It will be understood that the piston 7 may be rotated
on the stud 20 to prevent it from further unwarranted
turning. Even though such engagement is not completed
the detent-means still will act to prevent excessive rotative
movement of the piston with respect to the threaded
stud 20 which connects it with the driver-blade D.
Through this construction and arrangement of the pres
ent improved micrometer adjusting means, the relation
ship between the driver-blade D and piston 7 can be regu~
lated with extreme accuracy without opening the head
H or disassembling any parts of the machine.
The method of operation of the complete machine is
explained in full in my previous application from which
the present case is divided. It is to be noted, however,
that the instant invention of means for conveniently ad~
ciprocable in said cylinder, a driver for reciprocation by
fecting relative displacement between said piston ‘and said
threaded stud to effect longitudinal adjustment of said
driver axially of said piston.
3. In a fastener applying machine, a casing having a
hollow head with a pressure chamber therein, -a cylinder
in said head, a piston slid-able in said cylinder, a threaded
stud screwed into ‘the bottom of said piston, ‘a driver
?xedly connected to said stud to project downwardly
therefrom, manually-operable means rotatable above the
top of said head, and ‘a member carried by said last
named means for engaging slots in the upper end of said
piston for rotating it about said threaded stud to raise
or lower the driver in relation thereto for adjusting the
extent of its driving stroke
justing the relationship between the driving piston and
4. In a fastener applying implement, a casing having a
25
head with a closed top, a reservoir for pressure ?uid in
fastener driver-blade increases the utility or versatility of
said head, ‘a cylinder in said head in communication with
the machine by adapting it for driving fasteners of dif
said pressure ?uid reservoir, 2. piston slidably in said cyl- ferent lengths. It is to be understood that the stroke of
inder, a threaded stud screwed into said piston, a driver
the piston 7 is of constant length at all times but to adapt
it to drive fasteners of relatively large size, such as staples 30 ?xedly connected to said stud to'project downwardly from
said piston, yieldable detent means for normally prevent
with legs of maximum length, the driver must be of suf
ing said piston from turning relatively to said stud, a
?cient extension to insert the staples to the required
finger knob rotatably mounted in the top of said head, and
depth. Usually, machines of the present type are con
means carried by said knob for engaging said piston to
structed to provide a piston stroke of a length at least
equal to, or slightly greater than, the length of the longest 35 effect relative rotation between it and said stud to ad
just the extent of driving stroke of said driver.
staples. In machines of the prior art, however, it has
5. In ‘a fastener applying machine, a casing having a
been necessary to open the casing of the machine to adjust
head closed at the top and open at the ‘bottom for inser
the parts of the driving mechanism for driving staples
tion of the operating mechanism thereinto, a closure for
of greater or lesser length. For this purpose either a
the bottom of said head, a cylinder in said head, a ?uid
different length of driver is necessary or the relationship
pressure reservoir above said cylinder, a piston reciproca
between the driver and piston required adjustment.
ble in said cylinder, a driver reciprocable by said piston,
In the present machine the ‘stroke of the piston 7 is of
screw-‘threaded means connecting said driver to said pis
such extent that normally with the piston in its upper
ton, and manually-operable means accessible above the
most relationship as shown in FIG. 1 its lower driving
top of the head and provided with means within the head
edge is raised somewhat above the staple S to be operated
for relatively rotating said piston ‘and said screw-threaded
on even though staples of substantially maximum length
are being used. Consequently if shorter staples are to
be used it is only necessary to adjust the driver D up
wardly in relation to the piston 7 in the manner as here
means to adjust said driver and vary the extent of its
driving stroke.
'
6. In a fastener applying implement, a casing formed
inbefore explained; that is by rotating the piston about 50 with ‘a hollow head closed at the top and provided with
a reservoir therein for pressure fluid, ‘a cylinder in the
the stud 20. In this way the relative extension of the
driver can be regulated with micrometer accuracy by
lower part of said head with its upper end in communi
turning the ?nger-grip or knob 30 without opening the
cation with said pressure reservoir, a hollow piston in
casing of the machine or disassembling any of the parts.
said cylinder open at the top and closed by a bottom wall,
In ?ne, the present improvement provides manually
operable means readily accessible from the outside of
the casing and available at all times for adjusting the
amount of extension of the driver below the piston
without delays for opening the casing or disassembling
any of the parts.
While the present improvements are shown and des
cribed as embodied in a preferred form of construction,
55 a threaded stud screwed into the bottom wall of said
piston, a driver-blade fastened to 'said stud, said stud hav
ing a ?at-sided portion, a resilient pawl engageable with
the ?at sides of said stud, means engageable with said
pawl for normally preventing rotation of said piston about
said threaded stud, a ?nger-knob mounted above the
closed top of said head by a stern rotatable in a bore
therein, and means carried ‘at the lower end of said stem
it is to be understood that various modi?cations may be
engageable with means on the piston for turning it rela~
made therein without departing from the spirit or scope
tively
to said stud whereby to adjust said driver-blade
of the invention as set forth in the accompanying claims. 65
vertically to extend or reduce its length below said piston.
Therefore, without limiting myself in this respect, I claim:
7. In a machine of the type indicated, a casing having
1. In a machine of the type indicated, a casing having
a head with a cylinder therein, a piston reciprocable in
a head with a cylinder therein, a piston reciprocable in
said cylinder, a driver-blade slidable in a guideway in said
said cylinder, a driver-blade slidable in a guideway in
head, screw-threaded means connecting said driver-blade
said head to prevent it from turning therein, screw
with said piston, means for preventing rotative movement
threaded ‘means connecting said driver-blade with said
of said screw-threaded means relative to said piston, means
piston, and means engageable with the top of said piston
engageable with the top of the piston for rotating it rela
to effect relative rotative movement ‘between said piston
tive to said screw-threaded means for adjusting the effec
and said screw-threaded means for adjusting the effective
length of said driver-blade below said piston, said means 75 tive length of said driver-blade below said piston, and
3,083,421
7
8
means accessible from above the top of the head for man
screw-threaded means for adjusting the effective extent
of said driver below said piston, said means for engaging
ually rotating said piston engageable means.
8. In a machine for driving fasteners, a casing, a cylin
the piston ‘being accessible for manual operation from
above the top of the casing.
der in said casing, a piston reciprocable in said cylinder,
means for reciprocating said piston, -a driver for apply
5
ing fasteners to a workpiece, screw-threaded means con
necting said driver with said piston for reciprocation
thereby, means for positively preventing rotation of ‘said
screw-threaded means, resiliently operated means for
normally preventing rotation of said piston relative to 10
said screw threaded means, means in the casing for en
gaging the top of the piston to rotate it relative to said
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,703,557
2,729,198
2,774,968
2,881,738
Polki ________________ __ Mar. 8,
Faccou ______________ __ Jan. 3,
Osborne et val _________ __ Dec. 25,
Baker _______________ __ Apr, 14,
1955
1956
1956
1959
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