U.S. patent number 3,651,289 [Application Number 04/886,497] was granted by the patent office on 1972-03-21 for apparatus for sensing the predetermined level of continuously fed particles.
This patent grant is currently assigned to Noken Kogyo Kabushiki Kaisha. Invention is credited to Hiroshi Nagashima.
United States Patent |
3,651,289 |
Nagashima |
March 21, 1972 |
APPARATUS FOR SENSING THE PREDETERMINED LEVEL OF CONTINUOUSLY FED
PARTICLES
Abstract
The apparatus according to this invention is adapted to be fixed
within a receptacle into which particles are continuously fed. When
the level of the particles reach the apparatus and the particles
cover a cone provided with said apparatus, said cone descends and
closes the switch of the electrical circuit containing a signalling
apparatus and, if desired, apparatus for suspending the feed and
discharging the contents of the receptacle. Several forms of the
cones are also shown.
Inventors: |
Nagashima; Hiroshi (Osaka,
JA) |
Assignee: |
Noken Kogyo Kabushiki Kaisha
(Osaka, JA)
|
Family
ID: |
25389129 |
Appl.
No.: |
04/886,497 |
Filed: |
December 19, 1969 |
Current U.S.
Class: |
200/61.2;
200/341; 200/61.21 |
Current CPC
Class: |
H01H
35/00 (20130101) |
Current International
Class: |
H01H
35/00 (20060101); H01h 035/00 (); H01h
003/00 () |
Field of
Search: |
;200/61.2,61.21,61.42,82.3,83.34,81.9,153.19,82D,83G,81.9R,153T |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Scott; J. R.
Claims
What I claim is:
1. An apparatus for sensing the predetermined level of continuously
fed particles comprising a laterally projecting casing attached to
a side wall of a receptacle, a micro-switch contained in said
housing, a vertically extending rod having a lower end bearing upon
a push button of the micro-switch, the upper end of said rod
supporting a cone, a spring disposed within the laterally
projecting casing about said rod for holding said rod in a raised
position, a flexible cover for preventing particles from entering
into the housing, the cone being provided with a downwardly
directed lower edge.
2. An apparatus according to claim 1, wherein the cone is composed
of yieldable material so that the same is yieldable under the
weight of the particles gathered upon the cone.
Description
The apparatus according to this invention is arranged at a proper
position within a receptacle into which particles are continuously
fed. When the level of the particles within said receptacle reaches
a predetermined height, the apparatus functions automatically to
close an electric circuit containing an apparatus for signalling
the reaching of the predetermined level and, if desired,
apparatuses for suspending the feeding as well as discharging the
contents of the receptacle whereby a definite quantity of the
particles may be easily measured and removed from the
receptacle.
The apparatus according to this invention comprises a housing, a
switching means such as a micro switch or other pressure responsive
switching element arranged in said housing, a vertical rod
projecting upward from said housing and cooperating with said
switching means, a cone attached to the upper end of said rod for
receiving the particles thereon and a spring for normally
maintaining said cone and rod in the ascending position, but which
is yieldable to the weight of the particles gathered on the cone so
as to permit the cone and its supporting rod to descend in order to
operate the switching means.
During the feeding operation, the level of the particles within the
receptacle rises gradually. After the level passes by the housing
of the invented apparatus, the particles begin to gather upon the
cone and the weight thereof causes the descent of the cone. Since
the particles exist below the cone, it is essential that the cone
should descend easily without much resistance in order to ensure
the high sensitivity of the apparatus. For this purpose, I have
devised several appropriate cone forms as later explained.
This invention will be clearly understood with reference with the
following description as well as the accompanying drawings in
which,
FIG. 1 is a side view of the apparatus according to this invention
with partial sectional view and,
FIGS. 2-8 show seven types of the cones.
In FIG. 1, 1 is a receptacle. 2 is the housing of the apparatus
according to this invention attached at a proper position by a
lateral arm 4 to the side wall of the receptacle 1. 3 is a micro
switch arranged in the housing 2. 6 is a vertical rod cooperating
with the push button 7 of said micro switch. A part of the rod 6
projects upward from the housing 2 and supports a cone 5. A spring
8 is provided to maintain the cone 5 and the rod 6 at the ascending
position. Bellows 9 surround the upper portion of the rod 6 and
prevent particles from intruding to the interior of the
apparatus.
The function of the apparatus is as follows:
During the feeding operation, the level of the particles within the
receptacle 1 rises gradually upward until it reaches and, then,
passes by the housing 2 of the apparatus. Finally particles begin
to gather upon the cone 5. When a sufficient quantity of particles
gathers upon the cone 5, the weight thereof causes the cone 5
together with the rod 6 to descend whereby the rod 6 depresses the
button 7 of the micro switch 3 so as to close the circuit
containing the signalling apparatus and apparatuses for
discontinuing the feeding operation and discharging the contents of
the receptacle 1.
When the contents of the receptacle 1 are discharged, the cone 5
will return to the initial raised position by means of the spring 8
and the micro switch 3 will again resume the "off" position.
Therefore, by repeating the above operations, substantially equal
quantity of particles may be taken away every time from the
receptacle 1.
In order to facilitate the descent of the cone, I have devised
several types as shown in the drawings.
The cone 5 shown in FIG. 1 is preferably made from plastic material
and its lower edge portion 11 is stiff and vertically extending.
The cone of this type is adapted to be used for particles of fine
size or powder.
However, if the particles be of a larger size (say 4-10 mm. dia.),
the particles gathered below the skirt of the cone will greatly
hinder the downward movement of the cone and in extreme case the
apparatus becomes inoperative.
In order to overcome such a defect, I have improved the cones as
shown in FIGS. 2-8.
The cone 5A shown in FIG. 2 is preferably made of soft elastic
material such as rubber and is covered with a metal or hard plastic
cap 12. The round edge 11A of this cone 5A is made much flexible by
means of a circular groove 10A formed around the inner surface of
the cone.
The cone 5B shown in FIG. 3 is preferably made of comparatively
soft plastic material. The edge 11B is vertically disposed and the
cone is provided with rows of inner grooves 10B between the top and
the base.
In the cone 5C shown in FIG. 4, the skirt 11C is downwardly
disposed and is provided with bellows 10C.
The cone 5D shown in FIG. 5 is provided with a skirt 11D consisting
of a coil spring.
The cone 5F shown in FIG. 6 is provided with a vertically downcast
edge 11F and inner groove 10F. The cone 5G shown in FIG. 7 is
similar to the cone 5F except that it has a round edge 11G. Said
cone is provided with inner grooves 10G. The cone 5E shown in FIG.
8 is comprised of a spiral of metal or plastic strip 11E.
If desired, in place of conical forms, pyramidal cones may be
employed.
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