1. * GB780028 (A)
Description: GB780028 (A) ? 1957-07-31
Improved nail packing machine
Description of GB780028 (A)
COMPLETE SPECIFICATION
Improved Nail Packing Machine
We, GUNNEBO BRUKS AKTIEBOLAG, of
Gunnebobruk, Sweden, a Swedish Joint Stock Company, do hereby declare
the invention for which we pray that a patent may be granted to us,
and the method. by which it is to be performed, to be particularly
described in and by the following statement:
The present invention relates to machines for packing nails into
cases.
The object of the invention is to provide a machine of this class,
which may be used for packing nails of various shapes and sizes, also
including spikes, independently of the kind or quality of the material
from which the nails, or spikes, are manufactured.
According to the invention the machine comprises. a series of feeder
chutes including, at least, two vibrator controlled chutes, viz.
a first one for receiving the nails to be packed and acting as a
hopper therefor and a last one for delivering the nails to the cases,
and an intermediate chute for transferring the nails received from
said hopper chute to a subsequent chute, usually the delivery chute
exclusively due to its inclined position without the use of vibrating
means, said intermediate chute being arranged as a scale beam so as to
weigh down and decrease its degree of inclination when receiving too
large an amount of nails from the hopper chute, at the same time
effecting an interruption of the supply of power to the hopper chute
vibrator and maintaining said interruption until the intermediate
chute is sufficiently unloaded for restoring its normal position.
To allow the case or cases to perform a vibratory movement during the
receipt of the nails with a view to causing the nails to collect into
the cases without leaving any free spaces therein, the machine may be
provided with a vibrator controlled table for supporting a single case

2. or a number of cases below the outlet end of the delivery chute.
The feeder chutes may be arranged in a zigzag fashion below each
other, thereby allowing a very compact machine structure.
In the accompanying drawings a preferred embodiment of the invention
is illustrated.
Fig. 1 is a side elevation of the machine and
Fig. 2 is a vertical cross section taken on the line 11-Il of Fig. 1.
A framework, generally designated by the reference numeral 1, supports
at its top a slightly inclined chute 2 closed at its upper end and
open at its lower end to act as a hopper for the nails, or spikes, to
be packed.
Secured to the bottom of the hopper chute 2 by means of suitable
braces 3 is a vibrator 4. In order to allow the chute 2 to respond to
the function d the vibrator the upper ends of the standards of the
framework 1 comprise separate members coupled to said standards by
means of rubber buffers 5.
Provided below the hopper chute 2 is a chute 6 inclined in the
opposite direction to that of the hopper chute 2. The degree of
inclination of hopper 6 is such as to allow the contents thereof to
slide down therein without any vibration of the chute. The receiving
end of chute 6 is cup-shaped and enlarged, as shown at 7, sufficiently
for receiving the outlet end of chute 2. The chute 6 is pivoted near
its lower end to suitable members of the framework, as shown at 8.
Near its upper end the chute 6 rests on a helical spring device 9
provided at members of the frame structure. At a point between the
ends of chute 6 a pin 10 laterally projecting from the chute engages a
longitudinal slot of an ear 11 forming the upper end of the control
lever of an electric switch for controlling the supply of current to
the vibrator 4 of the hopper chute 2.
Chute 6 forms a transition plane between the hopper chute 2 and a
delivery chute 12 mounted on frame elements in such a way as to be
capable of performing a vibratory movement created by a vibrator 13.
The delivery chute 12 which is likewise enlarged at its upper end so
as to form a sort of cup for receiving nails dropping from chute 6,
has its lower open end situated over a packing case or cases 14 placed
on a table 15.
Said table is supported by links 16 pivoted at their lower ends to
base elements of the frame structure. Provided on the table 15 are
clamping devices 17 for locking the case or cases in position on the
table. By means of said clamping devices bordered filler hoppers 18
placed at the open tops of the cases are also held in position. The
table
15 is connected by means of a rod 19 to an eccentric 20 by the
operation of which the table 15 may be reciprocated in a direction

3. parallel with the longitudinal direction of the feeder chutes.
The operation of the machine is substantially as follows:
The quantity of nails, or spikes, that the case or cases supported by
the table 15 may hold, is dumped into the hopper chute 2. In a
preferred embodiment, three cases may be placed upon the vibratory
table 15. The vibrators 4 and 13 are started by means of electric
switches provided on a common switchboard 21. Due to the vibration of
the hopper chute 2 the nails, or spikes, therein are fed towards the
outlet end of the chute end and successively transferred to the
receiving end 7 of the intermediate chute 6 along the bottom of which
the nails, or spikes, slide due to the comparatively high degree of
inclination to then drop into the cup-shaped upper end of the delivery
chute 12.
For the sake of a better distribution effect the intermediate chute 6
may be provided with longitudinally extending guide walls 22,
Fig. 2, positioned at suitable distances from each other as well as
from the side walls of the chute. Should the intermediate chute 6
receive at a time a larger amount of nails, or spikes, than can be
suitably received by the delivery chute 12, then the upper portion of
chute 6 sinks while compressing spring 9 and, when the chute reaches a
predetermined lower position the pin 10 operates the ear 11 and the
associated switch lever, causing the switch inside the casing 23 to
open the circuit of the vibrator 4 for the hopper chute 2. As a
result, chute 2 will stop feeding nails to chute 6, and chute 6 due to
its decreased degree of inclination will only allow the nails therein
to move downwards at a decreased rate. According as nails are
transferred from chute 6 to chute 12, chute 6 will gradually restore
its original position and, after having again pass= the abode said
predetermined position, the circuit uf the vibrator 4 is again closed
and chute 2 is again set in operation.
From the vibrating chute 12 the nails. or spikes, are delivered to the
cases 14 at a rate determined by the vibration of chute 12. The effect
of the delivery chute may be varied in well-known manner bx regulating
the vibration. In the cases 14 the nails, or spikes, are subjected to
a final vibratory action, causing them to completely fill the cases
except for unavoidable free ,paces therein.
What we claim is:
1. A machine for pucking nails, or spikes, into cases, charact.rTzed
bv the provision of a series of feeder chutes including, at least, two
vibrator control1.d chutes, viz. a first one for receiving the nails
to be packed and acting as a hopper therefor and a last one for
delivering the nails to tili: cases, and an intermediate chute for
trinsferring the nails received from said hopper chute to a subsequent
chute. usually the delivery chute, exclusively due to its inclined

4. position without the use of vibrating means, said interinediate chute
bring arranged as a scale beam so as to weigh eloxvn and decrease its
degree of inclination R en receiving too large an Amount of nails irom
the hopper chute, at the same time effecting an interruption of the
supply of power to the hopper chute vibrator and mal ntaa ing said
interruption, until the intermediate chute is suffilciently unloaded
for restoring its normal position.
2. A machine as claimed in Claim 1, characterized in that the chutes
of the series of feeder chutes are arranged in zigzag relation below
each other in order to allow a compact structure of the machine.
3. A machine as claimed in Claim 1 or 2, eharacterized in that the
intermediate chute is provided with longitudinally extending guide
walls positioned at suitable distances from each other as well as from
the side walls of the chute.
4. A machine as claimed in Claim 1, characterized by the provision of
a vibratory table for supporting one or more cases below the outlet
end of the delivery chute.
5. A machine substantially as hereinbefore described and as
illustrated in the accompanying drawings.