U.S. patent number 3,637,967 [Application Number 05/056,074] was granted by the patent office on 1972-01-25 for switch of the reversing-type.
This patent grant is currently assigned to Skil Corporation. Invention is credited to Hermann E. Braun.
United States Patent |
3,637,967 |
Braun |
January 25, 1972 |
SWITCH OF THE REVERSING-TYPE
Abstract
The switch includes a base or block mounting first and second
pairs of fixed contacts, with each of these contacts having a
portion thereof adjacent the wall of a bore formed in the base
centrally thereof. A cylinder is rotatably received in this bore,
the cylinder carrying first and second movable contacts. An
actuating arm is provided to move the cylinder back and forth
between a first position wherein the first and second movable
contacts respectively connect the contacts of the first and second
pairs of fixed contacts with each other and a second position
wherein the first and second movable contacts respectively connect
different ones of the first pair of contacts with the contacts of
the second pair of contacts.
Inventors: |
Braun; Hermann E. (Chicago,
IL) |
Assignee: |
Skil Corporation (Chicago,
IL)
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Family
ID: |
22001990 |
Appl.
No.: |
05/056,074 |
Filed: |
June 26, 1970 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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748271 |
Jul 29, 1968 |
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Current U.S.
Class: |
200/565; 200/1V;
200/11A; 502/355; 200/571 |
Current CPC
Class: |
H01H
21/02 (20130101) |
Current International
Class: |
H01H
21/00 (20060101); H01H 21/02 (20060101); H01h
021/30 (); H01h 021/10 (); H01h 023/12 () |
Field of
Search: |
;200/157,155R,11R,11A,1V,8R,166CT,166BG |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Schaefer; Robert K.
Assistant Examiner: Vanderhye; Robert A.
Parent Case Text
RELATED APPLICATIONS
This is a continuation of application Ser. No. 748,271 filed July
29, 1968, and now abandoned.
Claims
I claim:
1. A switch comprising a base mounting first and second pairs of
fixed contacts, a member rotatably mounted by said base and
carrying first and second movable contacts each having a pair of
contacting ends, the movable contacts being arranged relative to
each other such that each of said contacting ends is in a
nonconducting relationship with adjacent contacting ends, means for
rotating said member back and forth between a first position
wherein said first and second movable contacts respectively connect
one contact of the first pair of contacts with one contact of the
second pair of contacts and the other contact of the first pair of
contacts with the other contact of the second pair of contacts and
a second position wherein said first and second movable contacts
respectively connect said one contact of the first pair of contacts
with said other contact of the second pair of contacts and said
other contact of the first pair of contacts with said one contact
of the second pair of contacts, said one contact of the first pair
of contacts having an arcuate extent such that one contacting end
of said first movable contact is in engagement therewith in both of
said positions, said other contact of the first pair of contacts
having an arcuate extent such that it is engaged by one contacting
end of said second movable contact when said member is in said
first position and by the other contacting end of said second
movable contact when said member is in said second position.
2. The switch according to claim 1 further defined by, said base
including a block having a bore, said base having a plurality of
cavities each opening into said bore and respectively mounting said
fixed contacts with each of the fixed contacts having a portion
thereof adjacent the wall of said bore, said member consisting of a
cylinder rotatably received in said bore, each of said movable
contacts having pairs of end portions engageable respectively with
said portions of the associated fixed contacts upon rotation of
said cylinder back and forth between said first and second
positions.
3. The switch according to claim 2 further defined by, each of said
fixed contacts being generally in the form of a strip, said strips
having respective ends thereof defining said fixed contact
portions, said strips each having opposite ends shaped to define
push-in terminals.
4. A switch comprising a base mounting first and second pairs of
fixed contacts, a member rotatably mounted by said base and
carrying first and second movable contacts, means for rotating said
member to a first position wherein said first and second movable
contacts respectively connect one contact of the first pair of
contacts with one contact of the second pair of contacts and the
other contact of the first pair of contacts with the other contact
of the second pair of contacts and to a second position wherein
said first and second movable contacts respectively connect said
one contact of the first pair of contacts with said other contact
of the second pair of contacts and said other contact of the first
pair of contacts with said one contact of the second pair of
contacts, said base including a block having a bore, said base
having a plurality of cavities each opening into said bore and
respectively mounting said fixed contacts with each of the fixed
contacts having a portion thereof adjacent the wall of said bore,
said member consisting of a cylinder rotatably received in said
bore, each of said movable contacts having a pair of end portions
engageable respectively with said portions of the associated fixed
contacts upon rotation of said cylinder back and forth between said
first and second positions, said cavities being four in number with
two of the cavities opening at sides of the block and at one face
thereof and with the other two of said cavities opening at sides of
the block and at the opposite face of the latter, a pair of plates
secured to said block in substantial coextensive contact with said
one and said opposite face thereof, respectively, and thereby
cooperating with said cavities to define substantially closed
spaces containing said fixed contact strips.
5. The switch according to claim 4 further defined by, each of said
fixed contacts being in the form of a spring strip having an end
adjacent the portion of the associated cavity which opens at a side
of the block, and end of each strip being bent to define a push-in
terminal.
6. The switch according to claim 4 further defined by, said plates
each having an opening in coaxial relation with the opening in the
other plate, which openings respectively receive opposite end
portions of said cylinder thereby rotatably mounting the
latter.
7. The switch according to claim 2 further defined by, said
cylinder having a cutout portion adjacent one end thereof receiving
said first movable contact with opposite ends of the latter
disposed adjacent the outer surface of the cylinder, said cylinder
having another cutout portion at its other end receiving said
second movable contact with opposite ends of the latter disposed
adjacent the outer surface of the cylinder.
8. The switch according to claim 7 wherein said first movable
contact is identical with said second movable contact, and wherein
the contacts defining each of said first and second pairs of fixed
contacts are identical with each other.
9. The switch according to claim 1 in combination with a trigger
actuated switch, the latter being of the type adapted for mounting
in a portable tool and including a body movably mounting a trigger,
said base being fixedly mounted on said body, a manual actuating
arm connected with said member for rotating the same back and forth
between its first and second positions.
10. The combination according to claim 9 further defined by, said
arm being pivotally mounted on said base intermediate the ends of
the former, one end of the arm being engaged with said member and
the other end of the arm being disposed in the vicinity of said
trigger.
11. A switch comprising:
a. base means mounting first and second pairs of fixed contacts,
which base means define a bore interiorly thereof, which bore
exposes portions of each of said fixed contacts;
b. a member received in said bore for rotation about the
longitudinal central axis thereof;
c. said member having integral coaxial formations journaled by said
base means thereby supporting said member for rotation about said
axis, said member having another integral formation eccentric with
respect to said axis;
d. said base means having an opening receiving said another
formation and permitting movement thereof in said opening during
corresponding movement of said member back and forth between first
and second positions;
e. a portion of said another formation extending through said
opening and being disposed exteriorly of said base means;
f. an actuating arm pivotally mounted by said base means, which arm
has a recess receiving said another formation whereby actuation of
said arm serves to move said member back and forth between said
positions thereof; and
g. a third pair of contacts mounted by said member for operative
engagement with said first and second pairs of fixed contacts for
establishing a current path when said member is in said first
position and for establishing a different current path when said
member is in said second position.
12. The switch according to claim 11 further defined by said member
having a pair of cutout formations receiving said third pair of
contacts, respectively, said third contacts being in the form of
strips contained in planes parallel with said axis of rotation.
13. The switch according to claim 11 further defined by said base
means having a plurality of cavities each opening into said bore
and respectively receiving portions of said fixed contacts, said
portions of said fixed contacts being shaped to define push-in
terminals.
14. A switch comprising:
a. base means including block means defining a central bore, a
first pair of cavities adjacent one end of the bore and
communicating therewith and a second pair of cavities adjacent the
other end of the bore and communicating therewith;
b. a member mounted for rotation about the longitudinal central
axis of said bore;
c. first and second pairs of contact strips mounted respectively in
said first and second pairs of cavities by engagement with walls of
the latter, with a portion of each of said strips extending into
said bore and thereby defining a contact making surface extending
longitudinally of the bore;
d. said base means including plate means covering said first and
second pairs of cavities thereby capturing and substantially
enclosing said first and second pairs of contact strips
therein;
e. a third pair of contact strips carried by said member and each
having a pair of contact making surfaces extending longitudinally
of said bore adjacent the outer surface of said member, said
surfaces of the third pair of contact strips being arranged for
operative engagement with said contact making surfaces of said
first and second pairs of contact strips for establishing a current
path when said member is in said first position and for
establishing a different current path when said member is in
another position; and
f. the contact making surfaces of two of said contact strips
extending longitudinally of said bore to an extent such that
electrical communication is established between one contact strip
of said first pair of contact strips and one contact strip of said
second pair of contact strips simultaneously with establishment of
electrical communication between the other contact strip of said
first pair of contact strips and the other contact strip of the
second pair of contact strips when said member occupies one of its
aforesaid positions for establishing one of said current paths.
Description
OBJECTS OF THE INVENTION
A primary object of the present invention is the provision of a new
and improved switch having first and second pairs of fixed contacts
and first and second movable contacts selectively permitting
connection of the contacts of the first and second pairs of fixed
contacts with each other and, alternately, connection of different
ones of the contacts of the first pair of contacts with the
contacts of the second pair of contacts.
Another object of the present invention is the provision of a new
and improved switch of the type described for use with an electric
motor for reversing the direction of rotation thereof.
Still another object of the present invention is the provision of a
new and improved switch of the type described, wherein such switch
includes six contact strips defined by three pairs of contact
strips, the contacts of each pair of contacts being identical.
Another object of the present invention is the provision of a new
and improved switch of the type described which may be readily and
inexpensively constructed from a very minimum of parts.
Still another object of the present invention is the provision of a
new and improved switch of the type under consideration, wherein
such switch is readily adapted for mounting on the body of a
trigger-actuated switch, the latter being of the type adapted for
mounting within the housing of a portable electric tool.
Another object of the present invention is the provision of a new
and improved switch of the type under consideration, wherein such
switch includes fixed contact strips, each having an end portion
bent to define a push-in terminal.
These and other objects and advantages of the invention will become
apparent from the following specification disclosing a preferred
embodiment shown in the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevational view of one embodiment of the switch
according to the present invention showing the same operatively
associated with a trigger actuated switch, the latter being of the
type for mounting within the housing of a portable electric
tool;
FIG. 2 is an enlarged, exploded perspective view showing the switch
of the present invention;
FIG. 3 is an enlarged, partial elevation and partial vertical
section of the rotatable element of the switch;
FIG. 4 is a top plan view of the element shown in FIG. 3;
FIG. 5 is a bottom plan view of the element shown in FIG. 3;
FIG. 6 is a top plan view showing only the fixed contacts and the
block mounting the same;
FIG. 7 is a section taken along line 7--7 of FIG. 6; and
FIG. 8 is an electrical schematic illustrating exemplary current
paths brought about by operation of the switch.
DESCRIPTION OF A PREFERRED EMBODIMENT
The switch according to the present invention has a base structure
including a block 10 of dielectric material with end walls 11,
sidewalls 12 and upper and lower faces 14 and 15, respectively. The
block 10 includes a central through bore 16. Formed in the block 10
and opening into the face 14 thereof is a pair of cavities 18 and
19. The cavity 18 has a narrow throat portion 18a which opens into
the bore 16; this cavity has a wider throat portion 18b which opens
to one of the sidewalls 12 of the block. It will be understood the
cavity 19 is identical with the cavity 18 and arranged in the
offset, opposite hand relation thereto as indicated in FIGS. 2 and
6.
Formed in the block 10 is a small slot 20 having a depth the same
as that of the cavity 18; this slot opens at the face 14 of the
block and also opens into the bore 16. The block 10 includes a
similar slot 21 having a depth the same as that of the cavity 18.
This last-mentioned slot opens at the face 14 of the block and also
opens into the bore 16. Actually, the slots 20, 21 may be
considered as portions of the cavities 18, 19 as the former are
connected with the latter by arcuate cutouts 18c, 19c,
respectively, formed in the wall of the bore 16. It will be
understood the cutout 18c extends for the full depth or thickness
of the block 10.
The block 10 is further defined by cavities 22, 23 and slots 24, 25
(FIGS. 6 and 7) which open at the face 15 of the block. These
cavities and slots are identical with the respective cavities 18,
19 and slots 20, 21 and are arranged in the block such that they
would appear exactly as shown in FIG. 2 were the block 10 to be
turned over about its transverse centerline.
A first pair of contact strips 27, 28, identical with each other,
are respectively received in the cavities 19 and 23. Referring to
FIG. 6, it will be noted the contact strip 27 has an arcuate
portion 27a received within the cutout 19c with the inner surface
of the former being in smooth uninterrupted relation with the
surface of the bore 16. One end 27b of the contact strip is
received within the slot 21 thereby to aid in properly positioning
the arcuate portion 27a. The other end 27c of the contact strip is
bent to form a U-shaped formation, this end of the strip acting to
define a so-called push-in terminal. It will be understood the
contact strip 28 is mounted within the cavity 23 in precisely the
same manner as just described with respect to the mounting of
contact strip 27 in the cavity 19.
The block 10 mounts another pair of contact strips 30, 31, these
strips being identical with each other. The contact strip 30 is
received within the cavity 18, with one end tab 30a of this contact
strip being received within the slot 20 thereby to aid in mounting
an arcuate portion 30b of the contact strip within the cutout 18c
with the inner surface of the former in smooth uninterrupted
relation with the wall of the bore 16 as clearly seen in FIG. 6.
The strip portion 30b extends for substantially the full height or
depth of the block 10. The other end 30c of the contact strip is
bent to form a U-shaped formation, this end of the strip acting to
define a push-in terminal. It will be understood the contact strip
31 is received within the cavity 22 in the same manner as just
described with respect to mounting of the contact strip 30 in the
cavity 18.
A cylinder 34 of dielectric material is rotatably received within
the bore 16. Adjacent one end of the cylinder 34 is a cutout
formation 35 receiving a contact strip 36 in a manner for carrying
the latter for rotation with the cylinder 34. The strip 36 has end
portions 36a, 36b which are sprung in such a manner as to be urged
in yieldable engagement with the bore 16 and portions of the
contact strips as will be explained hereinbelow. The member 34
includes at the other or lower end thereof another cutout formation
37 identical with the formation 35 but rotated 90.degree. with
respect thereto. This cutout portion receives a contact strip 38,
the latter being identical with the contact strip 36. The contact
strip 38 includes end portions 38a and 38b.
The cylinder 34 is illustrated in FIG. 2 in a neutral position in
which it occupies only when passing back and forth between two
positions to be explained below. In one position of the cylinder 34
the same is rotated in a counterclockwise position approximately
45.degree. from the position shown in FIG. 2 such that the contact
end 36a is in engagement with the contact strip portion 27a and the
contact end 36b is in engagement with the contact strip portion
30b. When the cylinder 34 is in the same position, the contact end
38a is in engagement with the contact strip portion 28a and the
contact end 38b is in engagement with the contact strip portion
31b. At this time it should be mentioned that the contact end 36a
always remains in engagement with the contact strip portion 27a and
that the contact strip portion 28a is alternately engaged by
contact ends 38a, 38b.
The cylinder 34 is moved to its other position by rotating the same
in a clockwise direction for approximately 45.degree. from the
position shown in FIG. 2. When the cylinder 34 is swung to this
position, the contact end 36b will separate from the contact end
30b and come into engagement with the contact strip portion 31b.
When the cylinder 34 is rotated to this position, the contact end
38a separates from the contact strip portion 28a and comes into
engagement with the contact strip portion 30b simultaneously with
departure of the contact end 38b from the contact strip portion 31b
and engagement of the contact end 38b with the contact strip
portion 28a.
The base of the switch is further defined by the upper and lower
plates 40, 41, respectively, formed of suitable dielectric material
and secured to respective faces 14 and 15 of the block in
substantial coextensive contact therewith. These plates may be
secured to the block by fasteners in the form of small bolts 43, 44
and associated nuts 45, 46. Of course, rivets or other suitable
fasteners may be used in lieu of the bolts and nuts just mentioned.
The bolts 43, 44 are received in openings 40a in the plate 40 and
bores 10a, 10b in the block 10 and in openings 41a in the plate 41.
The plates 40 and 41 include respective circular openings 47, 48,
which openings are in alignment with each other and receive
respective pinlike members 49, 50 extending integrally from the
cylinder member 34 centrally of the latter thereby rotatably
mounting the cylinder 34 for movement back and forth between the
positions just described. The cylinder 34 includes an integral,
upstanding formation 52 freely received within an arcuate slot 53
formed within the upper plate 40. The formation 52 is received
within a notch 55a formed in one end of an actuating arm 55. The
actuating arm may be pivotally mounted intermediate its ends about
the bolt 44, the latter being slightly longer than the bolt 43 for
this purpose. The arm 55 has an enlarged end 55b which covers the
slot 53 regardless of the position of the arm; this feature
prevents entry of foreign particles into the switch interior.
The cylinder 34 is detented or yieldably held in each of the two
positions just mentioned by means of a ball 57 received in a blind
bore 58 formed in the cylinder 34 as best seen in FIG. 3. A coil
spring 59 contained within this blind bore engages the ball 57
urging the latter upwardly and allowing the same alternately to be
partially received within the small bores 60, 61 formed in the
upper plate 40.
As noted in FIG. 1, the switch according to the present invention
may be readily mounted on a trigger actuated switch, generally
designated 63, which switch may be of the type shown in Matthews et
al. U.S. Pat. Nos. Re. 26,267 and 3,389,365. Such trigger actuated
switch includes a body 64 movably mounting a trigger 65. This
trigger actuated switch, which is adapted for mounting within the
housing of a portable electric tool, may include contacts for
simply energizing the tool motor, or such switch may include a
speed control system of the type shown in Gawron U.S. Pat. No.
3,209,228 for providing variable speed of the tool motor. In a
preferred form of the present invention, the actuating arm 55 has
an end 55c disposed in overlying adjacent relation with the trigger
65 for actuation of the member 55 by the operator's trigger
finger.
In FIG. 8, the reversible electric motor of the tool is indicated
at 67, the lines from a suitable source of alternating current
being indicated at 68 and 69. It should be apparent that when the
arm 55 is swung to one side to locate the cylinder 34 in one of the
positions illustrated, the contacts 36, 38 will be in the solid
line position illustrated in FIG. 8 for energizing the motor 67 in
one direction. When the arm 55 is swung to the other side of the
trigger 65, the cylinder 34 will be moved to its other position
thereby locating the contacts 36 and 38 in the broken line
positions illustrated in FIG. 8 for energizing the motor in its
other direction. Actuation of the tool trigger will energize or
operate the motor in the direction of rotation governed by the
position of the arm 55.
It should be apparent the present invention provides a new and
improved switch of the reversing type. It will be understood that
the switch of the present invention is not to be limited for use
with the trigger actuated switch as illustrated in FIG. 1, as the
switch according to the present invention obviously has many other
uses. The switch according to the present invention may be
inexpensively constructed as it contains a minimum of parts, with
many of the parts being mere duplicates of each other. Because of
the simplicity of construction, the switch may be made quite small
and compact.
* * * * *