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Патент USA US2131297

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Sept. 27, 1938.
2,131,297
O. H. P‘IEPER
CORD STRAIN RELIEF MEANS
Filed May 31, 1935
2 Sheets-Sheet 1
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Sept. 27, 1938.
o. H.1PIEIPER -
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2,131,297
CORD STRAIN RELIEF MEANS
Filed May 31, 1935
2 Sheets-Sheet 2
‘2,131,297
Patented Sept. 27, 1938
UNITED s'rArss PATENT oFFicE
2,131,297
CORD STRAIN RELIEF MEANS
Oscar H. Pieper, Rochester, N; Y.
Application May 31, 1935, Serial No. 24,32’?
6 Claims.
(Cl. 32*22)
This invention relates to securing devices, and
a cord may be inserted into the securing means
by a simple downward movement as a natural
continuation of the act of withdrawing the cord
from the unit. It is also an object to- provide
improved cord securing means of simple and in- ‘
expensive construction and neat appearance.
Further objects and advantages of my invention
will appear from the detail description. '
has to do with means for holding cords or analo
gous members attached to instruments associated
with a dental unit or the like, in such manner as
to facilitate freedom of use of the instruments.
It is known to provide dental units comprising
a plurality of associated instruments, some elec
trical and some compressed air, to which are
attached ?exible cords which pass downward into
10 the column of the unit and have associated there
In the draw.ings:—
with tension means, commonly Weights, which
tend to hold the cords retracted within the col
umn while permitting withdrawal of the cords
in the use of the instruments. This arrange
15 ment, while possessing many good features, is
20
v
Figure l-is a fragmentary isometric side view 10
of the upper portion of a dentalunit embodying
my invention;
'
,
Figure 2 is a side view, partly broken away
and in section, of a dental unit embodying my
invention, showing one of the instrument cords . '
open to the objection that the tension to which
withdrawn and secured by the clamping means,
a Withdrawn cord is subjected interferes with
the freedom of use of the instrument attached
certain of the instruments being omitted for
clearness of illustration;
Figure 3 is a front view of the clamping means
to that cord.
In my Patent No. 1,694,669, issued December 11,
1928, I have disclosed, in conjunction with a unit
of the type above referred to, means for securing
a withdrawn cord in such manner that the por
tion of the cord outward beyond the securing
25 means is relieved of the pull of the tensioning
means, the pull being exerted upon the remainder
only of the cord and the securing means, so that
freedom of use of the instrument attached to the
cord is not interfered with. The securing means
30 is in the form of spring clips which extend sub-v
stantially horizontally and transversely of the
and the associated supporting bracket therefor; 20
Figure 4 is a section ‘taken substantially on
line ILA‘ of Figure 3, parts being broken away;
Figure 5 is a view similarto Figure 3, but with
the housing casing of the clamping means re
moved;
and
g
'
>
25
Figure 6 is a back View of the clamping'means
casing.
.
_
I have shown my invention, by way of example,
as applied to the dental unit disclosed in my co
pending application for Dental unit, Serial No. 30
5,947, ?led February 11, 1935.
It will be under
column of the unit.
These clips have proved to ‘ stood, however, that my invention may be ap
be highly e?icient ‘for holding the instrument plied to any other suitable dental unit. '
cords, but, due to their disposition, it may be
35 necessary at times for the dentist to use both
hands in Withdrawing a cord and inserting it
into the clip. This is inconvenient, and at times.
may be objectionable, since there may be frequent
instances when the dentist does not have both
40 hands availablev for inserting the cord in the clip
as, for example, when he is holding another in
strument in the patient’s mouth. Also, clips of
this character are not well adapted for use with
units in which the instrument cords pass through
45 a block or the like, which projects above the top
wall of the table top of the unit column.
The instant invention is in the nature of an
improvement over that of my above patent. It
is directed to the provision of a dental unit hav
50 ing cord securing means associated therewith in
55
such manner, and of
drawn cord can be
means with facility
use of but one hand.
vide securing means
such character, that a with
inserted into the securing
and, if necessary, with the
A further object is to pro
so related to the unit that.
In Figures 1 and 2 of the drawings, I'have
shown a dental unit comprising a hollow column 35
it! provided at its upper end with a downwardly
and forwardly inclined ‘table top H in which is
mounted an instrument block 52.’ This block l2,
which may be considered as part of the table
top, is provided with suitable openings, through
which pass ?exible cords, which are attached, in
a known manner, to instruments seating in ap
propriate recesses or sockets formed in block l2.
The instruments mounted in the block maybe
a hot air syringe :4, hand pieces or switch
handles i5 adaptedto receive in their upper ends
suitable electrical instruments, and an air cut~
01f nozzle 96, of known type, adapted for quick
attachment to atomizers. It will be understood
that the cords attached to instruments It and
it, which cords are not shown, are in the form
of rubber tubing or air hose, and are connected
to a suitable source of compressed air, and the
cords attached to switch handles l5, one of which
latter cords is shown and identi?ed by reference 55
2
2,131,297
number l3, are electrical cords connected to a
tion of a cord I3 downward between arm 25
source of electrical energy; as is Well known in
and the side wall 26 of the casing with facility.
Casing 22 is preferably disposed at the mid
length of block I 2, with the cord clamping means,
comprising arms 25 and side walls 26 of casing
22, in substantial alignment with the switch han
dles l5, since these latter are the instruments
most frequently used for any considerable length
the art.
>
The air hose and the cords l3 have associated
therewith means for urging them inward of col
umn I6, so as normally to retain the air hose and
the electrical cords retracted and the instru
ments seated in block 12, while permitting with
drawal of the cords and the air hose in the use
of the instruments. In the embodiment of my
invention illustrated by way of example, each air
hose and each cord i3 passes about and beneath
wheel ll of a pulley and weight member £8. The
other end of each air hose and each cord 13 is
15 suitably anchored within column M, as is well
known in the art, and members I 8 maintain them
under tension effective to return the air hose
and the cords to retracted position and- hold
the associated instruments seated in block l2,
20 while permitting withdrawal of the air hose and
cords in the use of the instruments.
A bracket I9 is suitably secured, as by screw
means, to a lug !2a of block [2. This bracket
is shaped as shown, and comprises an upwardly
25 projecting arm 20 carrying, at its upper end, an
integral flat plate 2! of rectangular shape, which
of time.
In use, the selected switch handle, with
its associated instrument, is removed from block 10
i2, the attached cord l3 being withdrawn from
column In to the desired extent. The cord l3, as
withdrawn, extends slightly above and adjacent
the clamping means, as indicated by the position
of cord l8 shown in dot and dash lines in Fig 15
ure 1.
Cord I3 is then swung downward, as a
natural continuation of the withdrawing opera
tion, as indicated by the dotted arrow (1 of Fig
ure 1, so as to be inserted between one of the
clamping arms 25 and the adjacent side wall 26 20
of casing 22. During this operation, which may
readily be performed with one handyif desired,
the upper projecting portion of arm 25 serves as
a guide for the cord. After the cord contacts the
upper portion of arm 25, it may be pulled later
25
ally so as to move the arm away from the eas
plate is disposed substantially vertical, projects
ing,‘ facilitating entry of the cord between the
above the table top of column ID, and extends arm and the adjacent casing wall, if desired.
transversely of and in substantial parallelism with The tension of spring 30 is such that cord [3 is
30 the front wall of the column if). A box-like or
effectively clamped between arm 25 and the side 30
namental casing 22 is mounted upon plate 2| in wall 26 of casing 22, so that the pull of the cor-d
a suitable manner, as by means of screws 23
tensioning means is taken by the clamp and the
passing through plate 2!; and threading into portion of the cord disposed inward of the clamp,
bosses 24 projecting rearward from the front wall the portion ofthe cord disposed outward beyond
35 of the casing. The top and the side walls of cas
the clamp being relieved of tension for freedom
ing 22 ?t snugly about the top and the sides of of use of the attached instrument.
plate 2| and facilitate accurate positioning there
As a general rule, the instruments l4 and I6,
on of the casing. Bosses 24, in addition to re
ceiving screws 23, also serve to space the front
40 wall of casing 22 the proper distance from plate
2|. Casing 22 is preferably formed as shown,
but may be of any other suitable or preferred
construction.
at the ends of block l2, are only used momen
tarily, and it is not ordinarily necessary to re
lieve the air hose attached to these instruments 40
from the pull of the tensioning means. How
ever, if desired, or in exceptional cases, the air
hose attached to either of the instruments l4 and
The upper corners 22a of casing 22 are pref
i6 may be inserted into the clamping means so
as to be held thereby, in substantially the man 45
25, disposed adjacent side walls 26 of casing 22, ner above described with respect to the electrical
are pivoted, adjacent their lower ends, on pins 21 cords l3. This operation is obvious and need
extending from front to back of the casing and not be described in detail.
suitably secured in bosses 28‘formed integral with
In order to release a cord l3 from the clamping
means, it is only necessary to pull the cord up
50 plate 2| at the lower corners thereof. The for
ward portions of these pins seat in bosses 29 ward, and if desired laterally away from cas
formed integral with the front wall of casing 22, > ing 22, until it passes from between arm 25 and
at the lower corners thereof, aligned with bosses the side wall of the casing. 'The cord may then
28. The side walls of casing 22 terminate above be retracted within-the column I0, and the in
45 erably rounded, as shown.
Clamping members
55 bosses 29, at 26a, to accommodate the clamp
ing members, as shown. Each clamping member
25 comprises an arm 25a of approximately elon
gated S-shape, and an integral ?nger 25?) which
curves inward and upward within casing 22 from
60 the lower end of arm 25a. A tension coil spring
30 connects ?ngers 25b and yieldingly urges
clamping arms 25a toward side walls 26 of casing
strument returned to block I 2, by the cord ten 55
sioning means. This operation of releasing the
cord and returning the instrument to block 12
may also be performed with one hand, when de
sired or necessary.
Obviously, an air hose- of
either of the instruments I 4 and I6, if held by
the clamping means, may be released therefrom
22, with which the arms 25 cooperate for clamp
in the same manner as the above.
While I have disclosed the clamping means of
ing an electrical cord i3 inserted between either
my invention, by way of example, as applied to
65 arm and the adjacent side wall of the casing. _ a dental unit to which it is related in a particu
Casing 22 thus provides a housing for ?ngers lar manner, it is not limited to use with the par
25b and spring 30, and cooperates with arms ticular unit shown. In its broader aspects, my in
25 for clamping the cords I3.
' vention comprehends clamping means of the
The upper portion of each arm 25 projects
above the adjacent side wall 26 of casing 22, and
is‘ curved upward and outward of the casing,
laterally thereof, as shown. The rounded corner
22a of the casing 22 and the upper portion of the
adjacent arm 25 thus de?ne a downwardly con
verging passage 3l, which is conducive to inser
character shown used with a suitable support for
dental or like instruments having attached there
to ?exible cords or hose having associated there
with tensioning means.
Also, the clamping
means itself may be used for various purposes, as
will be obvious.
It will be understood, by those skilled in the
2,131,297
art, that changes in construction and arrange
ment of parts of my invention may be resorted
to, without departing from the ?eld and scope
thereof, and I intend to include all such varia
tions, as fall within the scope of the appended
claims, in this application in which the preferred
form only of my invention is disclosed.
What I claim is:
1. In combination in clamping means of the
10 character described, a box-like casing compris
ing front and rear and side walls, clamping
members adjacent the sides of said casing and
cooperating therewith for clamping an article in
serted between said casing and either of said
15 members, and means within said casing yield-ing
ly urging said members toward said side walls of
said casing.
2. In combination in clamping means of the
character described, a box-like casing comprising
20 front and rear and side walls, clamping members
disposed adjacent and extending lengthwise of
the sides of said casing, and means within said
casing common to said members yieldingly urg
ing them toward the sides of said casing, said
25 clamping members cooperating with the sides of
said casing for clamping articles inserted there
between.
3. In combination in clamping means of the
character described, a box-like casing comprising
30 front and rear and side walls, clamping members
disposed adjacent and extending lengthwise of
the sides of said casing and projecting above the
latter, each of said clamping members being piv
oted adjacent its lower end on an axis extending
from front to back of said casing, and means
within said casing yieldingly urging said clamp
ing members about their pivots toward the sides
of said casing.
4. In combination in clamping means of the
40 character described, a box-like casing compris~
ing front and rear and side walls, clamping mem
bers disposed adjacent and extending lengthwise
of the side walls of said casing exterior thereof,
each of said members being pivoted adjacent its
45 lower end on an axis extending from front to
back of the casing and each being provided with
3
an element extending upward and inward within
the casing, and a tension spring within said cas
ing connecting said elements and yieldingly urg
ing said members toward said side walls of said
casing.
5. In combination in a dental unit, a support
ing column, an instrument supporting member
mounted on the upper end of said column, dental
instruments mounted in said member, ?exible
cords attached to said instruments and passing
upward through said column and supporting
member in the use of said instruments, yielding
tension means urging said cords inward of said
column, a box-like casing mounted adjacent and
in front of said supporting member with its top 15
wall thereabove for movement over said top wall
of a withdrawn cord, clamping arms at the sides
of said casing extending thereabove for con?ning
the cord laterally of the casing during movement
over the top thereof, said arms being movable at
their upper ends toward and away from the sides
of the casing in a plane substantially parallel to
the front of said column, and means housed with
in said casing for yieldingly urging said arms
toward the sides of said casing.
6. In combination in a dental unit, a support
ing column, an instrument supporting member
mounted on the upper end of said column, dental
instruments mounted in said member, flexible,
cords attached to said instruments and passing 30
upward through said column and supporting
member in the use of said instruments, yielding
tension means urging said cords inward. of said
column, a structure comprising a top wall and
side walls mounted adjacent and in front of said 35
supporting member with its top wall thereabove
for movement over said top wall of a withdrawn
cord, clamping arms at the sides of said struc
ture extending thereabove for con?ning the cord
laterally of said structure during movement over 40
the top thereof, said arms being movable at their
upper ends toward and away from said side walls
of said structure in a plane substantially parallel
to the front of said column, and means yieldingly
urging said arms toward said side walls.
OSCAR H. PIEPER.
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