U.S. patent application number 12/504962 was filed with the patent office on 2011-01-20 for thermal imaging device with a battery pack with a shock absorber.
This patent application is currently assigned to FLUKE CORPORATION. Invention is credited to Jeffrey Elrod, Michael E. Loukusa, Justin M. Sheard.
Application Number | 20110014812 12/504962 |
Document ID | / |
Family ID | 43014322 |
Filed Date | 2011-01-20 |
United States Patent
Application |
20110014812 |
Kind Code |
A1 |
Loukusa; Michael E. ; et
al. |
January 20, 2011 |
THERMAL IMAGING DEVICE WITH A BATTERY PACK WITH A SHOCK
ABSORBER
Abstract
A thermal imaging device includes a replaceable battery pack,
which may include a shock absorbing and/or seal member. A battery
portion of the battery pack includes an electrical contact and a
sidewall that contains at least one battery cell, which is
electrically coupled to the contact. An attachment mechanism of the
battery pack is configured to engage a portion of a housing of the
device, such that a portion of the battery pack forms a terminal
end of the device, the battery portion is held within the portion
of the housing, and the electrical contact of the battery portion
is operably connected to the imaging assembly of the device. The
attachment mechanism is releasable from engagement with the
housing, such that an entirety of the battery pack can be
completely separated from the thermal imaging device.
Inventors: |
Loukusa; Michael E.;
(Buffalo, MN) ; Sheard; Justin M.; (Rogers,
MN) ; Elrod; Jeffrey; (Seattle, WA) |
Correspondence
Address: |
Intellectual Property Group, Fluke Patents
Fredrikson & Byron, P.A., 200 South 6th Street, Suite 4000
Minneapolis
MN
55402
US
|
Assignee: |
FLUKE CORPORATION
Everett
WA
|
Family ID: |
43014322 |
Appl. No.: |
12/504962 |
Filed: |
July 17, 2009 |
Current U.S.
Class: |
439/500 |
Current CPC
Class: |
G01J 5/028 20130101;
G01J 5/04 20130101; G01J 2005/0077 20130101; G01J 5/044 20130101;
G01J 5/02 20130101; G01J 5/0265 20130101; G01J 5/048 20130101 |
Class at
Publication: |
439/500 |
International
Class: |
H01R 3/00 20060101
H01R003/00 |
Claims
1.-5. (canceled)
6. The thermal imaging device of claim 44, wherein the the
replaceable battery pack further includes a seal member for sealing
an interior of the housing from an environment external thereto,
when the attachment mechanism of the battery pack engages with the
end of the housing.
7. The thermal imaging device of claim 6, wherein: the seal member
of the replaceable battery pack includes an outer perimeter ridge,
the outer perimeter ridge surrounding the sidewall of the battery
pack; and the end of the housing includes a relatively hard and
non-deformable surface against which the outer perimeter ridge of
the seal member abuts, when the attachment mechanism of the battery
pack engages with the end of the housing.
8. The thermal imaging device of claim 7, wherein the battery pack
further comprises a relatively hard and non-deformable surface,
which is located to also abut the relatively hard and
non-deformable surface of the end of the housing, when the
attachment mechanism of the battery pack engages with the end of
the housing.
9.-11. (canceled)
12. The thermal imaging device of claim 6, wherein the seal member
is formed by either a two shot molding process or an over-molding
process.
13. (canceled)
14. The thermal imaging device of claim 44, wherein: the end of the
housing includes a recess formed in an inner surface thereof; the
attachment mechanism of the base portion of the replaceable battery
pack comprises a projection and a release member, the projection
being spring-loaded and the release member being coupled to the
projection; the projection is configured to be received by the
recess of the housing, for engagement therewith; and the release
member is located such that a finger of a hand can push against the
release member in order to move the projection against the spring
loading, thereby disengaging the projection from the recess of the
housing in order to release the attachment mechanism from
engagement with the end of the housing.
15. The thermal imaging device of claim 14, wherein: the attachment
mechanism of the replaceable battery pack further includes a leaf
spring member to create the spring loading for the projection of
the attachment mechanism; and the leaf spring member includes a
first end and a second end, the first end being mounted in a slot
formed in an inner surface of the base portion, and the second end
being coupled to the projection.
16.-18. (canceled)
19. The thermal imaging device of claim 44, wherein: the housing
includes a first portion and a second portion, the first portion of
the housing containing the imaging assembly and including a first
side, to which a focusing assembly of the device is mounted, a
second side, which is opposite the first side and to which a
display of the device is mounted, and a third side, which extends
between the first and second sides; the second portion of the
housing extends out from the third side of the first portion of the
housing, to form a handle of the device, and includes the end of
the housing with which the attachment mechanism of the replaceable
battery pack engages.
20. The thermal imaging device of claim 44, wherein the end of the
housing and the attachment mechanism of the replaceable battery
pack each include an orientation marker to facilitate a proper
orientation of the battery pack for engagement with the end of the
housing.
21.-22. (canceled)
23. A battery pack for a thermal imaging device, the battery pack
comprising: a battery portion including a sidewall, which contains
at least one battery cell, and an electrical contact for connecting
the at least one battery cell to an imaging assembly of the thermal
imaging device; and a base portion including a first face, against
which the battery portion is secured, a second face, opposite the
first face, a shock absorbing member comprising a layer of material
formed over the base portion, and an attachment mechanism, which is
configured to engage with a housing of the device and to be
releasable therefrom; wherein, when the attachment mechanism
engages with the housing of the thermal imaging device, the battery
portion is held within the housing, the electrical contact of the
battery portion is held in electrical connection with the imaging
assembly of the device, within the housing, and the base portion
forms a terminal end of the thermal imaging device, that protrudes
outside the housing; and when the attachment mechanism is released
from engagement with the housing of the device, an entirety of the
battery pack is completely separable from the thermal imaging
device.
24. (canceled)
25. The battery pack of claim 23, wherein the shock absorbing
member also serves for sealing an interior of the housing of the
thermal imaging device from an environment external thereto, when
the attachment mechanism engages with the housing.
26. The battery pack of claim 23, wherein the second face of the
base portion of the replaceable battery pack comprises the
shock-absorbing member.
27. The battery pack of claim 23, wherein the layer of material
comprises a thermoplastic polyester elastomer.
28.-35. (canceled)
36. The battery pack of claim 23, wherein: the attachment mechanism
of the base portion comprises a projection and a release member,
the projection being spring-loaded and the release member being
coupled to the projection; the projection is configured to be
received by a recess of the housing of the thermal imaging device
for engagement therewith; and the release member is located between
the first and second faces of the base portion such that a finger
of a hand can push against the release member in order to move the
projection against the spring loading, thereby disengaging the
projection from the recess of the housing of the thermal imaging
device, in order to release the attachment mechanism from
engagement therewith.
37. The battery pack of claim 36,wherein: the attachment mechanism
of the base portion further includes a leaf spring member to create
the spring loading for the projection of the attachment mechanism;
and the leaf spring member includes a first end and a second end,
the first end being mounted in a slot formed in an inner surface of
the base portion, and the second end being coupled to the
projection.
38.-39. (canceled)
40. The battery pack of claim 23, wherein: the attachment mechanism
of the base portion of the replaceable battery pack comprises
opposing projections and opposing release members, each projection
being spring-loaded and each release member being coupled to a
corresponding projection; each projection is configured to be
received by a corresponding recess of opposing recesses of the
housing of the thermal imaging device, for engagement therewith;
and the release members are located in between the first and second
faces of the base portion, being spaced apart from one another such
that a thumb and a forefinger of a hand can push the third and
fourth faces toward one another in order to move the opposing
projections against the spring loading, thereby disengaging each
projection from the corresponding recess of the housing of the
thermal imaging device, in order to release the attachment
mechanism from engagement therewith.
41.-43. (canceled)
44. A thermal imaging device, comprising: a housing containing an
imaging assembly of the device; and a replaceable battery pack
including a sidewall, a shock absorbing member, an attachment
mechanism and an electrical contact, the sidewall containing at
least one battery cell being coupled to the electrical contact, and
the attachment mechanism being configured to engage with an end of
the housing and to be releasable therefrom; wherein, when the
attachment mechanism of the battery pack engages with the end of
the housing, the electrical contact of the battery portion is held
in electrical connection with the imaging assembly, within the
housing, and a portion of the battery pack forms a terminal end of
the device, outside the housing; the shock absorbing member of the
replaceable battery pack comprises a layer of material formed over
the portion of the battery pack that forms the terminal end of the
device; and when the attachment mechanism is released from
engagement with the end of the housing, an entirety of the
replaceable battery pack is completely separable from the
device.
45. The thermal imaging device of claim 44, wherein the layer of
material comprises a thermoplastic polyester elastomer.
46. The thermal imaging device of claim 44, wherein the shock
absorbing member also serves for sealing an interior of the housing
from an environment external thereto, when the attachment mechanism
of the battery pack engages with the end of the housing.
47.-50. (canceled)
Description
TECHNICAL FIELD
[0001] The present invention pertains to handheld thermal imaging
devices and more particularly to these devices that include a
replaceable battery pack, and to configurations of replaceable
battery packs for these devices.
BACKGROUND
[0002] Many state-of-the-art handheld thermal imaging devices,
which have a relatively large amount of built-in functionality, are
used in a variety of applications, ranging from the inspection of
buildings to the inspection and/or evaluation of industrial
equipment and processes. The utility of these devices not only
relies upon the components, which are necessary to generate and
display thermal images, but also upon handling features that
facilitate ease of use. Furthermore, there is a need for these
devices to withstand the rigors of daily use, which may include
exposure to relatively harsh environments and/or the occasional
careless handling.
BRIEF DESCRIPTION OF THE DRAWINGS
[0003] The following drawings are illustrative of particular
embodiments of the invention and therefore do not limit the scope
of the invention. The drawings are not to scale (unless so stated)
and are intended for use in conjunction with the explanations in
the following detailed description. Embodiments of the invention
will hereinafter be described in conjunction with the appended
drawings, wherein like numerals denote like elements.
[0004] FIG. 1A is a perspective view of a thermal imaging device,
according to some embodiments of the present invention.
[0005] FIG. 1B is a cross-section view through a portion of the
thermal imaging device shown in FIG. 1A, according to some
embodiments.
[0006] FIG. 2 is a perspective view of a replaceable battery pack,
having been removed from the portion of the thermal imaging device,
according to some embodiments.
[0007] FIG. 3 is another perspective view of the battery pack,
according to some embodiments.
[0008] FIG. 4A is a perspective view of a portion of the battery
pack, according to some embodiments.
[0009] FIG. 4B is an exploded perspective view of a base portion of
the battery pack, according to some embodiments.
[0010] FIG. 5A is an enlarged perspective view of a part of the
base portion, according to some embodiments.
[0011] FIG. 5B is an enlarged exploded perspective view of an
attachment mechanism and another part of the base portion,
according to some embodiments.
DETAILED DESCRIPTION
[0012] The following detailed description is exemplary in nature
and is not intended to limit the scope, applicability, or
configuration of the invention in any way. Rather, the following
description provides practical illustrations for implementing
exemplary embodiments of the invention.
[0013] FIG. 1A is a perspective view of a thermal imaging device
10, according to some embodiments of the present invention. FIG. 1A
illustrates a housing of thermal imaging device 10 including a
first portion 110 and a second portion 120. The housing may be
formed from one or more injection molded, hard plastic parts, which
lend structural support to all the components of device 10 that are
necessary to capture infrared images, and which provide an
effective handling interface for a user of device 10. FIG. 1A
further illustrates first portion 110 of the housing including a
first side 111, a second side 112, which is opposite first side
111, and a third side 115, from which second portion 120 of the
housing extends. According to the illustrated embodiment, second
portion 120 of the housing extends toward a terminal end 123 of
thermal imaging device 10 and forms a handle for device 10, while
first portion 110 of the housing contains a thermal imaging
assembly of device 10. The imaging assembly includes those
elements, known to those skilled in the art, that are typically
necessary for thermal imaging, such as a thermal sensor assembly,
for example, a microbolometer thermal detector, a lens assembly and
a printed circuit board assembly, for example, including one or
more signal processors. A focusing assembly 130 is shown mounted to
first side 111 of housing first portion 110, and a display 150
mounted to a second side 112, so that, when a user of device 10
grasps housing second portion 120, as a handle, the user may point
focus assembly 130 toward a scene and simultaneously view a
captured thermal image of the scene on display 150. An end 128 of
housing second portion 120 is shown including an aperture 125
extending therethrough; a handling strap (not shown) may be
secured, at one end thereof, to aperture 125, and, at another end
thereof, to a loop member 127, which is shown mounted to housing
first portion 110. Device 10 further includes various actuation
elements and/or buttons, a mounting of which may be ergonomically
arranged, for example, as is described in co-pending and
commonly-assigned U.S. patent application Ser. No. 11/873,699.
[0014] FIG. 1B is a cross-section view, taken along line A-A of
FIG. 1A, according to some embodiments. FIG. 1B illustrates a pair
of battery cells 312 contained within housing second portion 120
and being electrically connected to the imaging assembly of device
10, via an electrical contact 321. According to embodiments of the
present invention, battery cells 312 are included in a replaceable
battery pack, for example, battery pack 200, which is shown in
FIGS. 2 and 3. FIGS. 1B, 2 and 3 illustrate battery pack 200
including a sidewall 325, which contains battery cells 312, and
electrical contact 321, for example, being formed in sidewall 325.
With further reference to FIG. 2, battery pack 200 may be divided
into two portions: a battery portion 220, which includes sidewall
325, battery cells 312 and electrical contact 321, and a base
portion 210, on which battery portion 220 is mounted. When battery
pack 200 is inserted into end 128 of housing second portion 120,
base portion 210 engages with end 128, for example, as shown in
FIG. 1B, such that battery portion 120 is held within an interior
of housing second portion 120, the interior of housing second
portion 120 is sealed from an environment external thereto,
electrical contact 321 is held in electrical connection with a
mating connector of the imaging assembly of device 10, and base
portion 210 protrudes outside the housing to form terminal end 123
of device 10.
[0015] FIG. 3 illustrates base portion 210 including an attachment
mechanism 215, which is configured to engage with end 128 of
housing second portion 120 and to be releasable therefrom. FIG. 1B
illustrates the engagement of attachment mechanism 215, with
housing second portion 120, via a pair of opposing projections 150;
each projection 150 spring loaded, or biased, by a corresponding
spring member 153 of attachment mechanism 215, in order to engage
with a corresponding recess 105, which is formed in an inner
surface of end 128 of housing second portion 120. FIG. 1B further
illustrates attachment mechanism 215 including a pair of opposing
release members 151. According to the illustrated embodiment, when
release members 151 are pushed toward one another, for example, by
a thumb and forefinger of a user, projections 150, which are
operatively coupled to release members 151, are moved against the
loading/biasing of spring members 153 in order to disengage
projections 150 from recesses 105 and, thereby, release attachment
mechanism 215 from end 128 of housing second portion 120 so that
battery pack 200 may be separated from device 10. Although
attachment mechanism 215 is shown including opposing pairs of
projections 150, release members 151 and spring members 153,
alternate embodiments of the invention may include different
configurations of attachment mechanism, for example, which
including only a single projection 150, release member 151 and
spring member 153. FIGS. 1A-B further illustrate device 10
including orientation markers in the form of two ridges 190, 195;
ridge 190 is shown formed on end 128 of housing second portion 120,
and ridge 195 on one of release members 151. According to the
illustrated embodiment, ridges 190 and 195 serve as both a tactile
and a visible reference to help the user to properly orient battery
pack 200, when inserting battery pack 200 into housing second
portion 120 for engagement with end 128. The proper orientation is
necessary in order to align electrical contact 321 of battery pack
with the mating connector of the imaging assembly, within the
housing, when attachment mechanism 125 engages end 128.
[0016] With further reference to FIGS. 2-3, surfaces 108 and 308 of
housing end 128 and battery pack 200, respectively, are identified.
According to the illustrated embodiment, when attachment mechanism
215 of battery pack 200 engages with end 128, for example, as shown
in FIG. 1B, surfaces 108 and 308 come together to form an interface
that seals the interior of the housing from an environment external
thereto. Surface 308 may be an exposed portion of a seal and/or
shock absorbing member, for example, which is formed on base
portion 210 of battery pack 200, as will be described in greater
detail below. According to some preferred embodiments, surface 108
is relatively hard and non-deformable and is continuous about an
entire perimeter of inside of housing end 128, for example, having
been formed without any seam, mold parting line, or any other
similar discontinuity that could form a leak path at the seal
interface. According to some embodiments, in order to keep surface
108 free of these discontinuities, at least end 128, if not a
significant portion of housing second portion 120, is molded as a
single piece.
[0017] With further reference to FIGS. 1A-B, terminal end 123 of
device 10, being positioned as shown, may be subject to impact
loading, if device 10 is mishandled, for example, dropped; such
impact loading could damage the housing of device 10 and/or the
components contained within the housing of device 10. Thus,
according to some preferred embodiments of the present invention, a
shock absorbing member is included in battery pack 200. In some
embodiments, an exposed face 212 of base portion 210 of battery
pack 200 comprises the shock absorbing member. For example, an
entire bulk of a part of base portion 210, that includes face 212
(i.e. part 42 to be described in greater detail, below), is formed
from a shock absorbing material; alternately, a layer of shock
absorbing material, which includes face 212, is formed over a
surface of a part of base portion 210. Preferably a thermoplastic
polyester elastomer material (i.e. TPC-ET) is employed to form face
212. Commercially available thermoplastic polyester elastomers
include Hytrel.RTM., available from DuPont.TM., and Riteflex.RTM.
available from Ticona Engineering Polymers. Alternately, or in
addition, a shock absorbing member may be integrated into an
internal structure of battery pack 200.
[0018] FIG. 4A is a perspective view of battery portion 220 of
battery pack 200, according to some embodiments, having been
separated from base portion 210; and FIG. 4B is an exploded
perspective view of base portion 210, according to some
embodiments. FIG. 4A illustrates sidewall 325 of battery portion
220 including opposing first and second outer surfaces 401, 402,
and attachment posts 451 that protrude from first outer surface
401. FIG. 4B illustrates base portion 210 including a face 411
configured to interface with first outer surface 401 of battery
portion 220, when battery pack 200 is assembled, as shown in FIGS.
2 and 3; receptacles 415 are shown extending from face 411 and into
base portion 210, wherein each receptacle 415 is sized and
positioned to receive a corresponding attachment post 451 of
battery portion 220 for the assembly of battery pack 200. Although
not seen in FIG. 4A, one of attachment posts 451 includes a unique
profile for mating with only one of receptacles 415, so that a
proper orientation of battery portion 220 with respect to base
portion 210 is assured in the assembly of battery pack 200.
[0019] FIG. 4B further illustrates fasteners 45 (i.e. screws)
positioned adjacent to face 212 of base portion 210, where guide
bores 35 (FIG. 2) are formed to receive fasteners 45. Openings into
guide bores 35 may be seen in FIG. 2, and dashed lines in FIG. 4B
show each bore 35 extending within base portion 210, to a
corresponding internal opening 435. According to the illustrated
embodiment, an end of each fastener 45, when inserted into the
corresponding guide bore 35, extends through the corresponding
internal opening 435 in order to mate with internal threads of a
corresponding post 451, which has been inserted into a
corresponding receptacle 415 of base portion 210, when battery pack
is assembled 200. O-ring type seals may be employed adjacent to the
head of each fastener 45 for sealing against an internal shoulder
within the corresponding guide bore 35, when fasteners 45 are
tightened. According to some embodiments of the present invention,
face 411 of base portion 210 includes a member for shock absorbing
and/or sealing, for example, being formed from an elastomer
material, such as the thermoplastic elastomer know as Versollan
(available from GLS Corporation).
[0020] FIG. 5A is an enlarged perspective view of base portion 210,
according to some preferred embodiments, wherein a face 511 thereof
includes both a seal member and a relatively hard and
non-deformable surface. FIG. 5A illustrates the seal member
including a central portion 513, an outer perimeter ridge 513A and
a plurality of perimeter ridges 513B, each of which surrounds a
corresponding receptacle 415. With reference back to FIGS. 3 and
4A, according to the embodiment of FIG. 5A, outer perimeter ridge
513A of the seal member forms surface 308, which surrounds a third
outer surface 403 of battery portion sidewall 325, in close
proximity to first outer surface 401, when battery pack 200 is
assembled, and which seals against surface 108 within end 128 of
housing second portion 120 (FIG. 2), when attachment mechanism 215
of battery pack 200 is engaged with end 128. Furthermore, it may be
appreciated that each perimeter ridge 513B seals around the
corresponding attachment post 451 and against first outer surface
401 of sidewall 325, when fasteners 45 are mated therewith in the
assembled battery pack 200.
[0021] FIG. 5A further illustrates a plurality of relatively hard
and non-deformable surfaces 512A, which are approximately coplanar
with central portion 513 of the seal member, and an outer
relatively hard and non-deformable surface 512B, that surrounds
outer perimeter ridge 513A of the seal member. According to the
illustrated embodiment, surfaces 512A form a relatively hard and
non-deformable interface between base portion 210 and first outer
surface 401 of battery portion 220, which, by providing a `hard
stop`, limits a compression of the seal member when battery portion
220 is secured to base portion 210, for example, via the tightening
of fasteners 45 within posts 451. This `hard stop` can prevent an
over-tightening of fasteners 45, that could overload and
potentially damage posts 451, and can further control a tolerance
of the assembly of battery pack 200, for example, with respect to
the location of electrical contact 321 relative to attachment
mechanism 215, so that both contact 321 and attachment mechanism
215 operatively couple with device 10, when a user inserts battery
pack into housing second portion 120, as previously described. With
reference back to FIG. 1B, outer surface 512B may abut surface 108
to also provide a `hard stop`, at the interface between battery
pack 200 and housing end 128, when attachment mechanism 125 engages
with end 128.
[0022] According to some preferred embodiments, the seal member of
face 511 is formed over a portion of a surface of a part 41 of base
portion 210, preferably by a two-shot molding process or by an
over-molding process, so as to leave other portions of the surface
exposed as the aforementioned relatively hard and non-deformable
surfaces 512A, 512B. Part 41 may be formed from a relatively hard
plastic, such as a polycarbonate-acrylonitrile butadiene styrene
blend (PC-ABS), for example, available from Sabic Innovative
Plastics, and the seal member from an elastomer, such as the
aforementioned thermoplastic elastomer. According to alternate
embodiments, the seal member may be separately formed as a piece
part, which is subsequently coupled in between the surface of part
41 and first outer surface 401 of battery portion sidewall 325.
[0023] Returning now to FIG. 4B, base portion 210 is shown
including both first part 41 and a second part 42, which, when
brought together, for example, as illustrated in FIG. 3, hold
attachment mechanism 215 in place. FIG. 4B illustrates a sidewall
of each of parts 41 and 42 having opposing openings 419, 429 and an
edge 416 and 426, respectively; the contours of edges 416, 426 mate
with one another to align opposing openings 419 of first part 41
with opposing openings 429 of second part 42. Second part 42, like
first part 41, may be formed from a relatively hard plastic, such
as PC-ABS or, according to some preferred embodiments, may be
formed from a thermoplastic polyester elastomer, such as the
aforementioned Hytrel.RTM. or Riteflex.RTM., in order to function
as a shock absorbing member, as previously described. If second
part 42 is formed from the relatively hard plastic, a layer of
shock absorbing material may extend over a surface of part 42 to
form exposed face 212.
[0024] With reference to FIG. 3, in conjunction with FIG. 4B, it
can be appreciated that each of opposing openings 419 of first part
41 surround a corresponding projection 150 of attachment mechanism
215, and that each of opposing openings 429 of second part 42
surround a corresponding release member 151 of attachment mechanism
215. According to the illustrated embodiment, each projection 150
and the corresponding release member 151 are integrally formed, for
example, from a hard plastic material such as an acetal copolymer,
for example, Celcon M90 (available from Ticona Engineering
Polymers), which may be selected for its relatively lubricious
surface properties. Fasteners 45, in addition to securing battery
portion 220 to base portion 210, secure attachment mechanism 215 in
place, by securing first and second parts 41, 42 together around
attachment mechanism 215.
[0025] With reference to FIG. 5B, which is an enlarged exploded
perspective view of attachment mechanism 215 and second part 42,
spring member 153 is shown formed as a leaf spring and a slot 535
is shown formed within second part 42 to receive a first end 51 of
spring member 153, such that, when a second end 52 of spring member
153 is coupled with projection 150, and, when release member 151 is
placed within opening 429 of second part 42, spring member 153 may
be compressed between projection 150 and second part 42, for
example, as is shown in the cross-section of FIG. 1B. Spring member
153 may be formed from stainless steel, for example, 301 stainless,
having a thickness of approximately 0.4 mm.
[0026] FIGS. 4B and 5A-B further illustrate each release member 151
including shoulders 456, which extend from either side of the
corresponding projection 150, and portions 465 of edge 416 of first
part 41, that are configured to abut shoulders 456, when battery
pack 200 is assembled, according to some embodiments, so as to hold
each projection 150 in a predetermined position. The predetermined
position ensures that projections 150 are located at an appropriate
distance from face 411/511 of base portion 210 so that, when
projections 150 are received by recesses 105 of the housing of
thermal imaging device 10 (FIG. 1B), electrical contact 321 of
battery portion 220 is operatively connected with the imaging
assembly of device 10, and the seal member of face 411/511 is
sufficiently compressed against surface 108 within end 128 of
housing second portion 120, in order to seal the interior of the
housing from an environment external thereto. The predetermined
position, in conjunction with the compression properties of the
seal interface, also allows projections 150 to move past a lip of
recesses 105, as battery pack 200 is being inserted into end 128 of
housing second portion 120, and then to `snap` into engagement with
recesses 105.
[0027] In the foregoing detailed description, the invention has
been described with reference to specific embodiments. However, it
may be appreciated that various modifications and changes can be
made without departing from the scope of the invention as set forth
in the appended claims. For example, end 128 of housing second
portion 120 may include a seal member located to interface with a
relatively hard and non-deformable surface of replaceable battery
pack 200, when attachment mechanism 215 engages end 128. Such a
seal member may be employed in conjunction with, or as an
alternative to, surface 308 or perimeter ridge 513A of the
above-described battery pack seal member, although it is preferred
that replaceable battery pack 200 include a seal member, in order
to introduce a new seal member each time the battery pack is
replaced. Furthermore, one or more radially projecting seal
members, either in addition to, or as an alternative to the axial
projecting surface 308/perimeter ridge 513A and/or ridges 513B, may
be employed by alternate embodiments of the present invention. For
example, with reference to FIGS. 2 and 4A, a seal member may
project radially from third outer surface 403 of battery portion
sidewall 325 to seal against a relatively hard and non-deformable
inner surface 108' of housing end 128, when attachment mechanism
215 engages end 128 and surface 512B is in proximity to surface
108. Likewise a radial seal member may be formed around each
attachment post 451 or within each receptacle 415.
* * * * *