U.S. patent number 3,787,142 [Application Number 05/249,272] was granted by the patent office on 1974-01-22 for fan guard.
Invention is credited to Roger C. Dupke.
United States Patent |
3,787,142 |
Dupke |
January 22, 1974 |
FAN GUARD
Abstract
This disclosure relates to fan guard which includes a pair of
guard halves each including a plurality of peripheral wires
circumscribing progressively reduced areas from a first peripheral
wire toward a most remote and smaller second peripheral wire with
at least an additional peripheral wire therebetween, the guard
halves being disposed with the first peripheral wires adjacent each
other and means in the form of hooks pivotally connected to the
additional peripheral wire of a first of the pair of guard halves
and hooked upon the additional peripheral wire of a second of the
pair of guard halves for maintaining the same in assembled
relationship. Each hook includes an eye and a hooking nose at
opposite ends of a spanning portion and the spanning portions are
disposed inboard of, in contact with, and in spanning relationship
to the first peripheral wires of both the first and second guard
halves.
Inventors: |
Dupke; Roger C. (Merrill,
WI) |
Family
ID: |
22942750 |
Appl.
No.: |
05/249,272 |
Filed: |
May 1, 1972 |
Current U.S.
Class: |
416/247R;
D23/382; 74/608 |
Current CPC
Class: |
F04D
29/703 (20130101); Y10T 74/219 (20150115) |
Current International
Class: |
F04D
29/00 (20060101); F04D 29/70 (20060101); F04d
029/70 () |
Field of
Search: |
;416/247 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
|
|
771,894 |
|
Apr 1957 |
|
GB |
|
836,626 |
|
Jun 1960 |
|
GB |
|
Primary Examiner: Powell, Jr.; Everette A.
Attorney, Agent or Firm: Dittman; William A.
Claims
What is claimed is:
1. A fan guard comprising a pair of guard halves each including a
plurality of peripheral wires circumscribing progressibely reduced
areas from a first peripheral wire toward a most remote and smaller
second peripheral wire with at least an additional peripheral wire
therebetween, said guard halves being disposed with said first
peripheral wires adjacent each other while said second peripheral
wires are remote from each other, and means for removably securing
said guard halves to each other, said securing means being a
plurality of hooks each having first and second ends and a spanning
portion therebetween, said first ends being pivotally connected to
the additional peripheral wire of a first of said pair of guard
halves, said second ends being hooked upon the additional
peripheral wire of a second of said pair of guard halves, and said
spanning portions are disposed inboard of and span said first
peripheral wires of both said first and second guard halves.
2. The fan guard as defined in claim 1 wherein said spanning
portions contact inboard surface portions of said first peripheral
wires.
3. The fan guard as defined in claim 1 including a further
peripheral wire between said first and additional peripheral wires
of said first guard half, and said spanning portions are likewise
disposed inboard of and span said further peripheral wire.
4. The fan guard as defined in claim 1 wherein the axial distance
between said first and additional wire of said first guard half is
greater than the axial distance between said first and additional
wires of said second guard half.
5. The fan guard as defined in claim 1 wherein said first ends are
eyes and said second ends are radially inwardly opening noses in
the second positions thereof.
6. The fan guard as defined in claim 1 wherein the diameter of the
additional wire of said first guard half is less than the diameter
of the additional wire of said second guard half.
7. The fan guard as defined in claim 1 wherein said first ends are
eyes and said second ends are radially inwardly opening noses in
the second positions thereof, and each hook includes two aligned
eyes, noses and spanning portions constructed from a single piece
of bent wire.
8. The fan guard as defined in claim 1 wherein said first ends are
eyes and said second ends are radially inwardly opening noses in
the second positions thereof, and each hook includes two aligned
eyes, noses and spanning portions constructed from a single piece
of bent wire with ends of the bent wire located at said eyes.
9. The fan guard as defined in claim 3 wherein the axial distance
between said first and additional wire of said first guard half is
greater than the axial distance between said first and additional
wires of said second guard half.
10. The fan guard as defined in claim 3 wherein said first ends are
eyes and said second ends are radially inwardly opening noses in
the second positions thereof, and each hook includes two aligned
eyes, noses and spanning portions constructed from a single piece
of bent wire with ends of the bent wire located at said eyes.
11. The fan guard as defined in claim 4 wherein said first ends are
eyes and said second ends are radially inwardly opening noses in
the second positions thereof, and each hook includes two aligned
eyes, noses and spanning portions constructed from a single piece
of bent wire with ends of the bent wire located at said eyes.
12. The fan guard as defined in claim 9 wherein said first ends are
eyes and said second ends are radially inwardly opening noses in
the second positions thereof, and each hook includes two aligned
eyes, noses and spanning portions constructed from a single piece
of bent wire with ends of the bent wire located at said eyes.
Description
A primary object of this invention is to provide a novel fan guard
which is readily inexpensively manufactured, can be rapidly
assembled and disassembled and most importantly includes a pair of
guard halves which when secured in assembled relationship are
virtually vibration-free thus precluding rattling and other noise
when in assembled relationship to an energized fan.
A further object of this invention is to provide a novel fan guard
of the type heretofore described wherein tha anti-rattling feature
heretofore noted is achieved by forming the fan guard of a pair of
guard halves, each including a plurality of peripheral wires
circumscribing progressively reduced areas from a first peripheral
wire toward a most remote and smaller second peripheral wire with
the first peripheral wires being in adjacent relationship to each
other, and means for removably securing the guard halves to each
other, the securing means being a plurality of hooks each having
first and second ends and a spanning portion therebetween, the
first ends being pivotally connected to the additional peripheral
wire of a first of the pair of guard halves, the second ends being
hooked upon the additional peripheral wire of a second of the pair
of guard halves, and the spanning portions being disposed inboard
of and in spanning relationship to the first peripheral wires of
both the first and second guard halves and drawing the latter into
intimate contacting relationship thus precluding chatter,
vibration, noise, etc. when the guard is in assembled relationship
to an energized fan.
Still another object of this invention is to provide a novel fan
guard of the type heretofore described including a further
peripheral wire between the first and additional peripheral wires
of the first guard half, and the spanning portions are likewise
disposed inboard of and span the further peripheral wire.
Yet another object of this invention is to provide a novel fan
guard wherein the axial distance between the first and additional
wire of the first guard half is greater than the axial distance
between the first and additional wire of the second guard half
thereby providing one or more fulcrum points which maintain hooking
noses of the hooks in relatively tight engagement with the
additional peripheral wire of the second guard half.
A final object of this invention is to provide a novel hook
particularly adapted for association with one of a pair of fan
guards, the hook being composed as a single piece of wire bent to
form a pair of adjacent aligned side-by-side eyes, each eye
including one terminal end of the single piece wire, a pair of
adjacent aligned side-by-side hook-shaped noses remote from the
eyes, the noses being joined to each other by a bight portion, and
a pair of adjacent aligned side-by-side spanning portions one each
between an associated eye and nose.
With the above and other objects in view that will hereinafter
appear, the nature of the invention will be more clearly understood
by reference to the following detailed description and the several
views illustrated in the accompanying drawings.
IN THE DRAWINGS
FIG. 1 is a side elevation view of a novel fan guard of this
invention illustrated in unassembled condition, and illustrates a
pair of guard halves one of which includes a plurality of hooks for
securing the halves in assembled relationship .
FIG. 2 is a front elevational view taken along line 2--2 of FIG. 1,
and illustrates the manner in which one of two identically
constructed fan guard halves includes a plurality of peripheral
wires circumscribing progressively reduced areas, and the manner in
which each hook is associated with a radially disposed wire.
FIG. 3 is a side elevational view similar to FIG. 1, and
illustrates the manner in which the cage halves are secured to each
other by the plurality of hooks.
FIG. 4 is a fragmentary perspective view of one of the plurality of
hooks, and illustrates the manner in which the same is pivoted to a
peripheral wire while being in spanning relation to a radial
wire.
FIG. 5 is an enlarged fragmentary top plan view of the uppermost
hooks of FIG. 3 looking downwardly, and illustrates the manner in
which the hook is in underlying spanning relationship to two
contacting peripheral wires of the guard halves and in overlying
hooking relationship to an additional peripheral wire of one of the
guard halves.
FIG. 6 is a fragmentary sectional view taken generally along line
6--6 of FIG. 5, and more clearly illustrates the relationship of
the components of FIG. 5.
FIG. 7 is a fragmentary sectional view similar to FIG. 6, but
illustrates a hook whose eye is bent opposite to that of the hook
of FIG. 6.
Referring specifically to the drawings, a novel fan guard
constructed in accordance with this invention is generally
designated by the reference numeral 10 (FIGS. 1 through 3) and
includes a pair of substantially identical guard halves 11, 12.
Each of the guard halves 11, 12 is constructed from a plurality of
peripheral wires which in the preferred embodiment of the invention
are circular and circumscribe progressively reduced areas from a
first peripheral wire 13 (FIG. 1) of each guard half 11, 12 toward
a most remote and smaller second peripheral wire 14 with additional
or further peripheral wires 15, 16, 17, etc. therebetween. Each
guard half 11, 12 further includes a plurality of radially oriented
wires 18 (FIG. 2) inboard of, spanning and welded to the peripheral
wires 13 through 17. The radial wires 18 terminate at one end
adjacent the peripheral wire 13 of each guard half 11, 12 and at an
opposite end adjacent the peripheral wire 14 to permit a fan motor
shaft (not shown) to pass through the generally circular opening
defined by the peripheral wire 14 of the guard half 12 which
additionally includes conventional means (not shown) for securing
the latter to the fan motor housing.
Reference is now particularly made to the fan guard half 11 and
particularly the manner in which the same is provided with a
plurality of means, generally designated by the reference numeral
20, for removably securing the guard halves to each other with the
peripheral wires 13, 13 being in intimate contacting and thus
anti-vibrating relationship, in the manner best visualized in FIGS.
5 and 6 of the drawings. The securing means are a plurality of
hooks each having first and second ends 21, 22, respectively, and a
spanning portion 23 therebetween. Each hook 20 is constructed from
a single piece of wire bent to form at the first end 21 a pair of
adjacent aligned side-by-side eyes 24, 25 with each eye including
one terminal end 26, 27, respectively, of the single piece of wire.
The second end 22 of each hook 20 includes a like pair of adjacent
aligned side-by-side hook-shaped noses 30, 31 which open radially
inwardly and downwardly in the assembled condition thereof (FIG. 6)
with the noses being joined to each other by a bight portion 32.
The eyes 24, 25 are joined to the respective hooking noses 30, 31
of the hook 20 by respective spanning arms 33, 34.
Prior to the hooks 20 being assembled to the guard half 11 the eyes
24, 25 are opened a sufficient extent to permit the same to
encompass the peripheral wire 16 while at the same time sandwiching
therebetween one of the associated radial wires 18 in the manner
best illustrated in FIGS. 4 and 5, after which the eyes are closed
by simply bending the same to bring the terminal ends 26, 27 more
closely adjacent the respective spanning arms 33, 34. Due to this
arrangement the hooks 20 are precluded from sliding along the
peripheral wires 16 when the guard halves are unassembled due to
the radial wires 18 sandwiched between the eyes 24, 25 of each hook
20.
In order to assemble the guard halves 11, 12 the same are merely
brought together with the peripheral wires 13, 13 being initially
in adjacent though spaced relationship. The bight portion 32 of
each wire is then guided beneath the peripheral wire 13 of the
guard 12 and into the gap (unnumbered) between the wires 13, 15 of
the guard 12. As is best visualized in FIG. 6, as each bight
portion 32 passes over the outboardmost point of the wire 15 of the
guard half 12 the natural inclination of the hooking noses 30, 31
draw the hooks 20 to the right as viewed in FIG. 6 by a camming
action thus drawing the peripheral wire 13 of the guard half 11
into intimate contacting relationship with the wire 13 of the guard
half 12. Particular attention is directed to the fact that the eyes
24, 25 are pivotally secured to the peripheral wire 16 of the guard
half 11 which is spaced axially and radially inwardly further from
the peripheral wire 13 of the guard half 11 than is the wire 15 of
the guard half 12. In other words, and as best visualized in FIG.
6, the wire 16 of the guard half 11 is disposed more radially
inwardly then the wire 15 of the guard half 12. Accordingly, during
the hooking of the noses 22 upon the peripheral wire 15 of the
guard half 12 the spanning portion 23 of each hook 20 is bent to a
slightly upwardly opening concave position, as viewed in FIG. 6,
due to the bearing engagement of the spanning arms 33, 34 against
the underside of the wire 15 of the guard half 11 which in effect
serves as a fulcrum point F. When the spanning elements 33, 34
rebound under their natural resilience to the position shown in
FIG. 6 the spanning arms 33, 34 still bear against the wire 15 of
the guard half 11 due to the difference in the radial dimensions
heretofore noted with respect to the wires 16, 15 of the guard
halves 11, 12. Accordingly, even in the latched position the
natural resilience of the wires 20 maintains an extremely high
hooking force between the hooking noses 30, 31 and the wire 15 of
the guard half 12 to the extent that the inboardmost surfaces
(unnumbered) of the peripheral wires 13 of the guard halves 11, 12
are contacted by the spanning arms 33, 34. Thus the guard halves
are precluded from axial movement away from each other by virtue of
the hooks 20, axial movement toward each other by virtue of the
hooks 20 and the contact between the peripheral wire 13, 13 of the
guard halves 11, 12, and radial movement toward or away from each
other by the contact of the spanning arms 33, 34 with the inboard
sides of the peripheral wires 15, 13 of the guard 11 and the
peripheral wire 13 of the guard 12 in conjunction with the fulcrum
F maintaining such contact in the manner heretofore described.
Peripheral motion is, of course, precluded by the fact that each
radial wire 18 of each guard half 11, 12 passes between the eyes
24, 25, the spanning arms 33, 34, and the hooking noses 30, 31 in
the assembled or securing position of the guard halves 11, 12, as
is most readily apparent from FIG. 5. In this manner, the fan guard
10 is not only readily assembled but once assembled vibration,
chattering, etc. which might otherwise result in conventional
structures from the vibratory motion of an energized fan are
essentially totally precluded.
Referring to FIG. 7 of the drawings, identical reference numerals
have been placed thereon to indicate identity of structure in not
only the guard halves 11', 12' of the fan guard 10', but also the
hook 20' with the only difference being in the construction of the
eyes 24', 25' in the sense of being oppositely bent to that of the
eyes 24, 25 of the hook 20. Otherwise, the embodiment of the
invention illustrated in FIG. 7 is identical to that heretofore
described relative to the fan guard 10.
While preferred forms and arrangement of parts have been shown in
illustrating the invention, it is to be clearly understood that
various changes in details and arrangement of parts may be made
without departing from the spirit and scope of the invention as
defined in the appended claimed subject matter.
* * * * *