U.S. patent number 3,603,065 [Application Number 04/861,319] was granted by the patent office on 1971-09-07 for cam safe switch actuator.
This patent grant is currently assigned to The Black and Decker Manufacturing Company. Invention is credited to Edwin J. Weber.
United States Patent |
3,603,065 |
Weber |
September 7, 1971 |
CAM SAFE SWITCH ACTUATOR
Abstract
A lawnmower having a housing supported for movement along the
ground by a plurality of wheels. A motor-powered reel is supported
for rotation upon the housing and cooperates with a bedknife to cut
grass. A bale handle extends upwardly from the housing and has a
lever-operated switch disposed thereon for actuation of the motor.
Novel safety means is provided to selectively prevent actuation of
the switch by the lever.
Inventors: |
Weber; Edwin J. (Baltimore,
MD) |
Assignee: |
The Black and Decker Manufacturing
Company (Towson, MD)
|
Family
ID: |
25335484 |
Appl.
No.: |
04/861,319 |
Filed: |
September 26, 1969 |
Current U.S.
Class: |
56/16.7;
56/10.5 |
Current CPC
Class: |
A01D
34/6818 (20130101); A01D 34/828 (20130101); A01D
34/475 (20130101); H01H 3/20 (20130101); A01D
2101/00 (20130101) |
Current International
Class: |
A01D
34/412 (20060101); A01D 34/47 (20060101); H01H
3/20 (20060101); H01H 3/02 (20060101); A01d
035/24 () |
Field of
Search: |
;200/42,44,157
;56/26,16.7 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Mancene; Louis G.
Assistant Examiner: Eskovitz; J. N.
Claims
I claim:
1. In a lawn and garden device of the type having a housing
supported for movement over the ground, implement means supported
upon said housing and adapted to be driven by electric motor means,
a control and manipulation handle on said housing, and electric
switch means for turning said motor and said implement means on and
off; the improvement wherein said switch includes a pivotal lever
movable through an arcuate path to actuate said switch, and means
operable to shift the pivot axis of said lever, whereby to
selectively prevent said lever from actuating said switch.
2. The improvement of claim 1 wherein said shifting means includes
a rotatable cam supported upon said switch and pivotally mounting
said lever.
3. The improvement of claim 1 wherein said switch includes a switch
housing fixed to said handle, said lever being closely disposed to
said handle and shaped to generally follow the contour thereof,
said arcuate path of said lever being limited by engagement thereof
with said handle, whereby the operator can grasp said lever and
said handle during mower operation.
4. The improvement of claim 3 wherein said lever pivot axis is
shiftable from a first position where pivotal movement of said
lever through said arcuate path actuates said switch, to a second
position where pivotal movement of said lever is stopped by
engagement between said lever and said handle before actuation of
said switch.
5. A switch assembly comprising a housing having a switch body
mounted thereon, a control plunger slidable on said switch body and
normally biased in one direction, a lever having one end engageable
with and adapted to move said plunger in a direction away from said
one direction, means pivotally mounting said lever upon said
housing, said mounting means including a pivot pin having an
eccentric portion journaling said lever, and means for turning said
pivot pin, whereby said eccentric portion shifts said lever
laterally relative to said plunger, whereby to selectively prevent
engagement of said plunger by said lever one end.
6. The assembly of claim 5 wherein said pivot pin is rotatably
supported upon said body and has one end thereof exposed for manual
manipulation.
7. The assembly of claim 6 wherein said pivot pin end has a
transverse slot therein adapted to receive a screwdriver, coin, and
the like for turning said pivot pin and shifting said lever.
8. The assembly of claim 5 which includes stop means limiting
pivotal movement of said lever in a direction to engage and move
said plunger, said stop means preventing engagement of said plunger
by said lever when said lever has been shifted laterally relative
to said plunger by said eccentric portion.
9. The improvement of claim 2 which includes detent means
releasably holding said cam in selected rotated positions.
10. The improvement of claim 5 which includes cooperable projection
and recess means on said pivot pin and said housing for releasably
holding said pivot pin in selected turned positions, resilient
means normally biasing said pivot pin in an axial direction causing
cooperative engagement between said projection and recess
means.
11. In a lawnmower of the type having a housing supported for
movement over the ground, cutting means supported upon said housing
and driven by an electric motor, handle means for controlling and
manipulating said mower, and switch means including a switch
housing mounted on said handle and having a switch therein for
turning said motor on and off; that improvement which comprises
actuator means movable through a path to actuate said switch, and
means for shifting said actuator means away from said switch
whereby movement of said actuator means is ineffective to operate
said switch.
12. The improvement as defined in claim 11 wherein said actuator
means comprises a lever pivotally mounted on said switch housing,
said switch including a plunger normally biased toward an "off"
position, said lever being engageable with to move said plunger to
an "on" position.
13. The improvement of claim 12 wherein said altering means
includes a cam pivotally mounting said lever, said cam being
movable to shift the pivot axis of said lever from a first position
where said lever is engageable with said plunger, to a second
position where said lever is prevented from engaging said
plunger.
14. The improvement of claim 12 wherein said lever is contoured to
generally follow said handle, whereby an operator may grasp and
hold said lever and said handle during mower operation.
15. The improvement as defined in claim 13 wherein said cam is
turnably supported upon said housing and has an eccentric portion
journaling said lever, whereby turning movement of said cam turns
said eccentric portion and shifts said lever relative to said
plunger.
16. The improvement of claim 15 wherein said cam has one end
exposed and provided with a transverse slot adapted to receive a
screwdriver, coin, and the like.
17. In a lawnmower of the type having a housing supported for
movement over the ground, cutting means supported upon said housing
and driven by an electric motor, handle means for controlling and
manipulating said mower, and switch means including a switch
housing mounted on said handle and having a switch therein for
turning said motor on and off; that improvement which comprises
actuator means movable through a path to actuate said switch, a cam
engageable with said actuator for altering said path of movement of
said actuator means, whereby to selectively prevent said switch
from being actuated by said actuator means.
18. The improvement as defined in claim 17 which includes means
releasably retaining said cam in selected positions.
Description
SUMMARY OF THE INVENTION
The present invention is directed to a movable switch actuator
mechanism which includes manually manipulatable means adapted to
shift or alter the path of the movement of an actuator whereby to
selectively allow or prevent switch actuation even with actuator
movement. The novel switch actuator mechanism of this invention
embodies simplicity and reliability, and requires a simple but
positive act on the part of the operator to effect said path shift
or alteration.
Main objects of the present invention, therefore, are to provide a
novel movable switch actuator mechanism adapted for use in, for
example, an electric switch for a powered tool or the like and
which includes means integrated therewith for shifting or altering
the path of movement of the actuator so that in one condition, the
actuator movement actuates the switch while in another condition,
actuator movement cannot actuate the switch.
Further important objects of the present invention are to provide a
novel switch actuator of the above character which includes a
minimum of parts and is relatively inexpensive to manufacture, is
simple to operate but requires a positive act on the part of the
operator to change from one condition to the other, and is reliable
and safe in operation.
Other objects and advantages of the present invention will become
more apparent from a consideration of the detailed description to
follow taken in conjunction with the drawings annexed hereto.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view illustrating an electric lawnmower
embodying the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 illustrating the
switch and switch actuator mounting;
FIG. 3 is a view similar to FIG. 2 but with parts broken away and
in section showing the parts in the "safe" position and with the
actuator "off";
FIG. 4 is a view similar to FIG. 3 but showing the actuator
"on";
FIG. 5 is a view similar to FIGS. 3 and 4 but showing the parts in
the "operating" position and the switch "off";
FIG. 6 is a view similar to FIG. 5 but showing the switch "on";
FIG. 7 is a sectional view of FIG. 9 taken along the line 7--7
thereof;
FIG. 8 is a perspective view illustrating the manually
manipulatable means of the present invention; and
FIG. 9 is an enlarged sectional view of FIG. 2 taken along the line
9--9 thereof.
BROAD STATEMENT OF THE INVENTION
Broadly described, the present invention relates to a lawnmower of
the type having a housing supported for movement over the ground,
cutting means supported upon said housing and driven by an electric
motor, handle means for controlling and manipulating said mower,
and switch means including a switch housing mounted on said handle
and having a switch therein for turning said motor on and off; that
improvement which comprises actuator means movable through a path
to actuate said switch, and means for shifting said actuator means
away from said switch whereby movement of said actuator means is
ineffective to operate said switch.
In another aspect, the present invention relates to a lawn and
garden device of the type having a housing supported for movement
over the ground, implement means supported upon said housing and
adapted to be driven by electric motor means, a control and
manipulation handle on said housing, and electric switch means for
turning said motor and said implement means on and off; the
improvement wherein said switch includes a pivotal lever movable
through an arcuate path to actuate said switch, and means operable
to shift the pivot axis of said lever, whereby to selectively
prevent said lever from actuating said switch.
In still another aspect, the present invention relates to a switch
assembly comprising a housing having a switch body mounted thereon,
a control plunger slidable on said switch body and normally biased
in one direction, a lever having one end engageable with and
adapted to move said plunger in a direction away from said one
direction, means pivotally mounting said lever upon said housing,
said mounting means including a pivot pin having an eccentric
portion journaling said lever, and means for turning said pivot
pin, whereby said eccentric portion shifts said lever laterally
relative to said plunger, whereby to selectively prevent engagement
of said plunger by said lever one end.
DETAILED DESCRIPTION
Referring now to the drawings, a lawnmower, which is one device
with which the present invention finds particular use, is
illustrated generally at 11 in FIG. 1 and is seen to include a
housing 13 supported for movement along the ground by front wheels
15, 17 and rear wheels 19 (only one of which is shown). A reel 21
is rotatably supported upon the housing 13 between the wheels 15,
17 and includes a plurality of blades 23 which cooperate in
scissorlike fashion with a stationary bed knife 25 to cut grass.
The reel 21 is powered by an electric motor (not shown) mounted
upon the housing 13 beneath a removable shroud 27. A bale handle 29
extends upwardly from the housing 13 and facilitates control and
manipulation of the mower 11. An electric switch assembly 31,
including an operating lever 33, is provided at the top of the
handle 29 for turning the motor on and off. As shown, the operating
lever 33 generally follows the contour of the handle 29 so that the
operator can manipulate the lever 33 without releasing his grasp of
the handle 29.
As shown in FIG. 3, the electric switch assembly 31 includes a
two-part, switch housing 35, 36 secured in place on the bale handle
29 by a plurality of screws 37. A switch 39 is suitably secured in
place within the housing 35 and is connected to leads 41, 43 which
in turn are also connected to the motor (not shown) and to a power
source. The switch 39 has a plunger 45 normally biased outwardly
toward the position shown in FIG. 3 in which position the switch 39
is "off." However, the plunger 45 is movable away from this
position and inwardly of the switch 39 to turn the switch "on."
To this end, the lever 33 is pivotally supported upon the switch
housing 35 through a pivot pin 47 and has a projecting ear 49
positioned opposite the switch plunger 45. The pivot pin 47 has a
projecting end portion 51 received in an opening 53 formed in the
switch housing part 35, and an enlarged, eccentric midportion 55
upon which the lever 33 is journaled. The projecting end portion 59
is also supported in an opening 61 in the housing part 36.
The projecting end 51 of the pivot pin 47 is exposed at the top of
the switch housing 35 (as seen in FIG. 2) and is provided with a
screw-slot 63 adapted to receive the end of a screwdriver, a coin,
or the like. Thus, the pivot pin 47 can be selectively turned about
an axis through the end portions 51, 59 which, through the
eccentric midportion 55, laterally shifts the position of the pivot
for the lever 33.
A spring washer 57 is positioned on the end portion 59 and bears
against the housing part 36 thereby biasing the pivot pin 47 toward
the left, as seen in FIG. 9. This biases a lug 58, formed on a
radial face of the eccentric midportion 55, against a boss 60
formed on the housing part 35. The boss has a pair of arcuately
spaced recesses 62, 64 formed therein which receive the lug 58 in
detentlike fashion and releasably hold the pivot pin 47 selectively
in two rotated positions.
In the position shown in FIG. 3 and 4, the lug 58 is located in the
recess 64 and the pivot pin 47 is positioned so that the pivot axis
of the lever 33 is displaced toward the left. At rest, the lever 33
is positioned as shown in FIG. 3 and the switch 39 is "off." When
the operator grasps the lever 33 and pivots it in a counter
clockwise direction, as seen in FIGS. 3 and 4, the upper part of
the lever 33 engages the handle 29 before the projecting ear 49 can
engage the switch plunger 45 (see FIG. 4) and the switch 39 remains
"off." This position of the pivot pin 47, then, is known as the
"safe" position and is used during mower storage or when it is
desired to prevent the mower from accidentally being turned
"on."
In the position of the pivot pin 47 illustrated in FIGS. 5 and 6,
known as the "run" position, the pivot pin lug 58 is located in the
recess 62 and the pivot axis of the lever 33 is shifted toward the
right relative to that shown in FIGS. 3 and 4. At rest, the lever
33 is positioned as shown in FIG. 5 and the switch 39 is "off."
When the lever 33 is grasped by the operator (who has his hands on
the handle 29), counterclockwise pivotal movement of the lever
brings the ear 49 into contact with and moves the plunger 45
inwardly of the switch 39 to turn it "on." (See FIG. 6). When the
operator releases his hand from the lever 33, it moves by gravity
back to the FIG. 5 position and the plunger 45 likewise returns to
the FIG. 5 position under the force of the switch-biasing means. To
help identify the "safe" and "run" positions for the pivot pin 47,
suitable indicia 65 printed on the switch housing 35 aligns with,
for example, the cross slot 63 in the pivot pin end 51.
As described above, the projecting end 51 of the pivot pin 47 is
slotted at 63 to receive a screwdriver, coin, and the like for
turning the pivot pin 47 from the "safe" position to the "run"
position. When the operator inserts the screwdriver, coin, or the
like into the slot 63, he presses axially against the pivot pin 47
and releases the lug 58 from its slot 62, 64 so that the pivot pin
47 can be turned. It will be appreciated that while this is
relatively easy, it does require a positive act by the operator to
make the change from "safe" to "run." Thus, the likelihood that the
pivot pin 47 will be shifted from the "safe" to the "run" position
accidentally is virtually eliminated.
While a preferred embodiment of the invention has been set forth
herein, various additions, substitutions, modifications and
omissions may be made thereto without departing from the spirit
thereof.
* * * * *