U.S. patent number 3,860,042 [Application Number 05/366,551] was granted by the patent office on 1975-01-14 for dual valve snorkel.
Invention is credited to Thomas N. Green.
United States Patent |
3,860,042 |
Green |
January 14, 1975 |
DUAL VALVE SNORKEL
Abstract
Disclosed is a snorkel assembly (underwater swimming aid) which
has an inhalation check valve at the upper end of the elongated
tube, the tube having a mouthpiece at its lower end. Adjacent the
mouthpiece the assembly is provided with dual exhalation check
valves. Air is inhaled by the swimmer through the upper check valve
and exhaled through the lower check valves and rebreathing of
exhaled carbon dioxide is thus avoided.
Inventors: |
Green; Thomas N. (Indianapolis,
IN) |
Family
ID: |
23443502 |
Appl.
No.: |
05/366,551 |
Filed: |
June 4, 1973 |
Current U.S.
Class: |
128/201.11 |
Current CPC
Class: |
B63C
11/205 (20130101) |
Current International
Class: |
B63C
11/02 (20060101); B63C 11/20 (20060101); A63b
007/00 () |
Field of
Search: |
;128/145A,145R,147,142,142.3,142.4,146.3,146.4,146.5 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
|
|
472,977 |
|
Jul 1952 |
|
IT |
|
918,008 |
|
Sep 1946 |
|
FR |
|
927,661 |
|
May 1947 |
|
FR |
|
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Recla; Henry J.
Attorney, Agent or Firm: Woodard, Weikart, Emhardt &
Naughton
Claims
I claim:
1. A snorkel-type swimming aid comprising an elongated tube, a
hollow T-shaped fitting removably secured to and communicating with
one end of said tube, a mouthpiece member secured to and extending
sidewardly from that leg of said T-fitting to which said tube is
secured and communicating with the interior thereof, inhalation
valve means removably secured to the other end of said tube
permitting air to be drawn into the tube but not expelled
therefrom, exhalation valve means disposed at the opposed ends of
the other two legs of said T-fitting, said exhalation valve means
permitting air to be expelled from said fitting but preventing
water flow into said fitting when air is drawn into said tube
through said inhalation valve means.
Description
BACKGROUND OF THE INVENTION
Snorkel tubes are commonly used to permit swimmers to breathe with
their head partially or totally submerged. With conventional
devices of this type, where inhalation and exhalation takes place
through the same tube, a portion of the carbon dioxide laden
exhaled air is rebreathed or re-inhaled. Accumulation in the
swimmer's lungs can cause shortness of breath, fatigue and in
severe instances eventual loss of consciousness. Conventional
structures have, in their elongated tube, a trap bend to hold any
water which might enter the extending end of the tube from reaching
the mouthpiece. A small quantity of water accumulating in this trap
bend produces an audible gurgle with each breath of the swimmer
which is psychologically annoying. Further, conventional
structures, after a period of use must be purged of water in the
tube by blasting or forcing water out through the tube by exhaling
sharply into the mouthpiece.
The structure of the present invention obviates these difficulties
by providing dual exhalation valves adjacent the mouthpiece and an
inhalation check valve at the remote end of the tube.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of a snorkel assembly embodying the present
invention.
FIG. 2 is an exploded view of a portion of the apparatus shown in
FIG. 1.
FIG. 3 is a bottom view of the central portion of the structure
shown in FIG. 2 prior to assembly of the check valve
components.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring initially to FIG. 1, the assembly embodying the present
invention includes an elongated main tube 10 which may be straight
or of any desired curved configuration. A threaded collar 11,
together with an O-ring 12 provides a pressure fit of the lower end
of the tube 10 to the vertical leg 13a of a T-shaped fitting
indicated generally at 13. A tubular portion 13b accommodates a
hollow rubber mouthpiece component 14. The mouthpiece component 14,
as is conventional, is provided with a curved portion 16 which fits
the mouth of the wearer and nodules 17 which are clasped between
the teeth of the wearer to retain the mouthpiece in place.
The mouthpiece thus extends sidewardly from the leg 13a of the
fitting 13 and the horizontal leg of the fitting is formed by the
exhalation check valve assemblies as will be evident from FIG. 2.
As will be evident from comparing FIGS. 2 and 3 side portions of
the lower end of the leg 13a are cut away and accommodate discs 18
and 19. The discs have central apertures 18a and 19a respectively
and, as indicated in FIG. 2 the outer face of the disc 19
accommodates in abutting relation the adjacent end of a sleeve 21,
the sleeve being fastened to the disc 19 by any suitable
adhesive.
The disc 21 has extending transversely across its bore a rigid
perforated disc 22 which is provided with a central aperture 23.
The perforations through the disc 22 may take any suitable
configuration and as here indicated are of pie-shaped sector
configuration. Received within the aperture 23 is the shank portion
24 of the molded head 26 which forms a part of the flexible rubber
disc 27. It will be understood that when the member 26 is inserted
through the aperture 23 the disc 27 will be secured at its center
in overlying relation to the perforate disc 22 and will seal off
flow through the sleeve 21 when subjected to pressure on its face
remote from the disc 22, but will flex away from the perforate disc
to permit flow therethrough when subjected to unbalanced pressure
on its face adjacent the disc 22. The disc 18 receives an identical
check valve assembly which includes the sleeve 31, having a rigid
perforate disc 32. The central aperture 33 in the disc accommodates
the head 36 and shank 34 of the flexible rubber disc 37. The
flexible disc 37 acts to permit flow only in the outward direction
through the sleeve 31 in the same fashion as the disc 27 previously
described. While the flexible disc members and their mounting means
are preferably integrally molded of rubber, it will be understood
that other similar elastomeric material might also be utilized.
Referring again to FIG. 1, the upper end of the tube 10 is threaded
and receives an inhalation check valve assembly indicated generally
at 41. The check valve 41 includes a sleeve 42 which supports a
perforate disc 43 which is centrally apertured to accommodate the
mounting head 44 of a flexible rubber disc 46. The flexible disc
serves to seal off flow through the disc 43 when subjected to
pressure on its face remote from the disc 43 but flexes away from
the disc 43 to permit flow through it when subjected to unbalanced
pressure on its face adjacent the disc 43. The check valve assembly
41 is substantially identical to the exhalation check valve
assemblies previously described.
In operation, with the mouthpiece in place, inhalation by the
wearer will draw air through the check valve assembly 41 and
exhalation by the wearer will exhaust through the dual exhalation
valves forming a part of the T-shaped fitting 13. It will be noted
that water pressure seals the discs 37 and 27 preventing flow
through the sleeves 31 and 21 during inhalation and, similarly, the
check valve 41 will be closed by pressure against the underface of
the disc 46 during exhalation which functions to open, by flexure
of discs 37 and 27, the sleeves 31 and 21. There is a one-way flow
of air both in exhalation and inhalation and no appreciable portion
of the air in the tube is rebreathed. When the wearer surfaces
after a dive or a period of complete submersion, the snorkel
assembly of the present invention may be purged of water merely by
permitting the water to flow out of the sleeves 21 and 31 with only
a slight exhalation of the wearer to flex the valve discs 27 and
37.
* * * * *