DISPOSITIF POUR LE LEVAGE DE PIECES DE BOIS D'OEUVRE

DEVICE FOR LIFTING PIECES OF LUMBER

Abrégé anglais

ABSTRACT OF THE DISCLOSURE
A lumber lifting device is disclosed for lifting indi-
vidual pieces of lumber from an elongate soaking basin. The
device has a hoisting unit with a concave hoisting surface and
immediately below this a curved stopping surface. The device
is capable of revolving forwards and backwards to a limited
extent and the hoisting surface, which holds a single piece of
lumber, is located below the water surface of the basin. On
rotating the hoisting device the lumber is dumped so that it
rolls or glides off the hoisting surface and is transferred to
a reception position.

Revendications

The embodiments of the invention in which an exclu-
sive property or privilege is claimed are defined as follows:
1. A lumber lifting device for removing pieces of
lumber which are free floating in a liquid such as water in an
elongate soaking basin, which pieces are fed to the lifting
device in their transverse direction, said device comprising:
hoisting means including a concave hoisting surface and a stop-
ping surface connected to said hoisting surface on the bottom
of a front outter edge of said hoisting surface; said basin
including an upwardly inclined surface extending from the bot-
tom of said basin toward said hoisting means with an upper edge
below the water level of said basin adjacent the surfaces of
said hoisting means, and means for rotating said hoisting means
less than one-half revolution from a first reception position
with said hoisting surface outter edge substantially aligned
with said upper edge of said inclined surface below the water
level of said basin to receive one or more pieces of lumber
and a second dumping position with said hoisting surface above
the water level to discharge said pieces of lumber and said
stopping surface extending below the water level adjacent said
upper edge of said inclined surface to prevent pieces of lumber
from interfering with the rotation of said hoisting means.

Description

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The present invention relates to a device for lifting
pieces of lumber from an elongate soaking basin, in which the
pieces of lumber are fed transversely towards the lifting de-
vice
In previously known soaking basins use has been made
of a device in the form of a wheel for removing pieces of lum-
ber, the radial arms of the wheel serving to lift the pieces
of lumber. The wheel is obliged to rotate in the same direc-
tion, the entire device requiring a great deal of space~ As
the radial arms must be powerfully constructed, the wheel must
be heavy as a result, thereby causing a heavy load on its bea-
rings It is also known that for the transverse removal of
pieces of lumber from a water channel use has been made of a
grab device, whereby lifting arms, which can be raised or lowe-
red along vertical columns, for lifting the lumber For this
purpose, however, a checking device in coordination with the
arms is required to prevent the pieces of lumber coming into
contact with the arms when these are being lowered below the
level of the lumber before~ising to the surface with their
load. In consequence, the entire plant with its columns, lif-
ting arms and coordinated checking device is of a complicated
nature
The purpose of the present invention iæ to produce a
device for removi~g pieces of lumber, which is of stable but
at the same time of simple design, is modest with regard to
space requirements and is reliable in operation.
This purpose is achieved as follows:
A lumber lifting device for removing pieces of lum-
ber which are free floating in a liquid such a water in an
elongate soaking basin, which pieces are fed to the lifting de-
vice in their transverse direction, said device comprising:
hoisting means including a concave hoisting surface and a stop-
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ping surface connected to said hoisting surface on the bottom
of a front outter edge of said hoisting surfac~; said basin
including an upwardly inclined sur~ace extending from the bot-
tom of said basin toward said hoisting means with an upper edge
below the water ~evel of said basin adjacent the surfaces of
said hoisting means; and means for rotating said hoisting means
less than one-half revolution from a first reception position
with said hoisting surface outter edge substantially aligned
with said upper edge of said inclined sur~ace below the water
level o~ said basin to receive one or more pieces of lumber and
second dumping position with said hoisting surface above the
water level to discharge said pieces of lumber and said stopping
surface extending below the water level adjacent said upper
edge of said inclined surface to prevent pieces of lumber from
inter~ering with the rotation of said hoisting means.
The invention is shown in a design in one of the
attached drawings as an example.
Fig. 1 shows a vertical longitudinal section through
an end part of a basin equipped with a device for removing pie-
ces of lumber in accordance with the invention.
Fig. 2 shows the end part in Fig. 1 seen from above,but with certain details excluded.
The part of a soaking basin shown in the ~igures com-
prises part of a basin plant, for example of the type which
has an elongate basin, and in the latter, which is referred to
as 1, pieces of lumber 3 are fed forwards along the dashed lines
Fig. 1, while remaining in their transverse direction, in the
direction indicated by Arrow 2 in the direction of the left
end wall of the basin, Fig. 2, where a device forS~removing lum-
ber 53 in accordance with the present invention is installed.Next to the device ~or removing lumber 53 the basin 1 is fitted
with a lumber discharge opening 52. The device 53 consists of
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a hoisting unit with a hoisting surface 54 and a stopping sur-
face 55. The hoisting unit is capable of revolving forwards
and backwards, suitably one-quarter revolution along a shaft
56 and driven by a hydraulic device 57 coordinated to crank-
shaft 58. At the side of the device for-~removing lumber 53
outside the end wall of the basin there is a single piece fee-
ding device 60 and next to this a longitudinal conveyor 61
When the hoisting device is in the reception position
indicated in Fig. 1 by full lines and the hoisting surface 54
as well as the stopping surface 55 are below the water level,
the pieces of lumber, which are being fed through basin l;
the direction shown by Arrow 3, will possibly - via an inclined
surface 59 on the bottom of the basin - be moved on to the
hoisting surface 54 When, by means of the hydraulic device
57 being turned one-quarter of a revolution, the hoisting de-
vice reaches the dumping position shown by dotted lines in
Fig. 1, the piece or pieces of lumber, brought up by the hois-
ting surface 54, is/are removed from the basin and passed to
the single piece feeding device 60, which then passes on the
pieces of lumber one by one to the longitudinal conveyor 61
for further transport. The stopping surface 55 is continually
under water to ensure that the pieces of lumber in the basin
are not fed beyond the po~nt where they should be transferred
to the hoisting surface 54 when this is in the reception posi~
tion and also to prevent pieces of lumber from hindering the
return of the hoisting surface 54 to its starting position for
receiving a fresh load of lumber.
In accordance with the invention, the device for
removing pieces of lumbar is of simple design, which at the
same time is so stable that it can stand up to the loading of
pieces of lumber that breakdowns can be avoided, especially
thanks to the presence of the stopping surface 55 connected to
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the hoisting surface and that the space required for the plant
is limited because the hoisting unit is only turned forwards
and backwards less than one-half of a revolution.
The design described and shown on the drawings can
be modified within the scope of the invention. For example,
some other po~er device than the described hydraulic unit can
be used ~or turning the hoisting device forwards and backwards.
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