U.S. patent number 3,564,186 [Application Number 04/757,388] was granted by the patent office on 1971-02-16 for switch control mechanism.
This patent grant is currently assigned to Toro Manufacturing Corporation. Invention is credited to Robert A. Mittelstadt, Heinrich F. Tetzlaff.
United States Patent |
3,564,186 |
Mittelstadt , et
al. |
February 16, 1971 |
SWITCH CONTROL MECHANISM
Abstract
A remote control lever for operating the "On-Off" switch of the
motor of an electric mower. The lever is mounted on the handle and
manipulated by the operator while standing behind the handle. The
lever travels in parallel offset tracks so that in traveling from
the "Off" to the "On" position, the lever comes to a full stop at
the offset point and must be forcibly moved from one slot to the
other in order to reach the "On" position.
Inventors: |
Mittelstadt; Robert A.
(Burnsville, MN), Tetzlaff; Heinrich F. (St. Paul, MN) |
Assignee: |
Toro Manufacturing Corporation
(Minneapolis, MN)
|
Family
ID: |
25047629 |
Appl.
No.: |
04/757,388 |
Filed: |
September 4, 1968 |
Current U.S.
Class: |
200/331; 200/538;
56/10.5 |
Current CPC
Class: |
H01H
3/36 (20130101); H01H 21/10 (20130101) |
Current International
Class: |
H01H
3/36 (20060101); H01H 3/32 (20060101); H01H
21/10 (20060101); H01H 21/00 (20060101); H01h
003/02 () |
Field of
Search: |
;200/172A,161
;56/25.4 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Jones; H. O.
Claims
We claim:
1. In combination:
an electric motor;
an "On-Off" switch for said motor and operatively connected
therewith;
said switch having a movable switch-actuating element for opening
and closing said switch;
switch control means remote from said switch and movable between
switch opening and switch closing positions;
actuating means actuated by said control means extending between
said control means and said element and adapted to move said
element between switch closing and switch opening position in
response to said movement of said control means between said switch
closing and switch opening positions; and
means interrupting the movement of said control means between
switch opening and switch closing positions.
2. The combination of claim 1, wherein said motor and switch are
mounted on a ground traversing implement:
said implement having a steering handle behind which the operator
stands when operating said implement; and
said control means mounted on said handle and manipulatable by said
operator while standing in normal operative position behind said
handle.
3. The combination of claim 2, wherein said implement is a rotary
mower having a cutter blade housing:
said motor mounted on said housing;
wherein said actuating means includes a wire connected with and
longitudinally movable by said control means when it moves between
its switch opening and closing positions; and
wire carrying means adapted to engage said element and move same
between switch opening and switch closing positions in response to
longitudinal movement of said wire.
4. In combination:
an electric motor;
an "On-Off" switch for said motor and operatively connected
therewith;
said switch having a movable switch-actuating element for opening
and closing said switch;
switch control means remote from said switch and movable between
switch opening and switch closing positions;
actuating means actuated by said control means extending between
said control means and said element and adapted to move said
element between switch closing and switch opening position in
response to said movement of said control means between switch
closing and switch opening position; wherein said element is an
arm;
and wherein said actuating means includes a wire longitudinally
shiftable in response to the movement of said control means;
a pair of means carried by said wire adapted to selectively engage
said arm and selectively move same to switch opening and switch
closing position.
5. The combination of claim 4, wherein said wire is bent to provide
said pair of arm-engaging means.
6. The combination of claim 4, wherein said wire is bent to provide
a spring portion.
7. The combination of claim 4, wherein said wire has bent portions
providing said pair of arm-engaging means; at least one of said
bent portions also functioning as a spring.
8. The combination of claim 4, wherein said wire extends through an
opening in said arm; wherein said means adapted to selectively
engage said arm comprise a pair of stop elements carried by said
wire and disposed on opposite sides of said arm.
9. In combination:
an electric motor;
an "On-Off" switch for said motor and operatively connected
therewith;
said switch having a movable switch-actuating element for opening
and closing said switch;
switch control means remote from said switch and movable between
switch opening and switch closing positions;
actuating means actuated by said control means extending between
said control means and said element and adapted to move said
element between switch closing and switch opening position in
response to said movement of said control means between said switch
closing and switch opening positions;
wherein said control means comprises a pivotally mounted lever
swingable between switch closing and switch opening positions;
structure defining slot means in which said lever travels between
said positions;
said slot means being offset intermediate said opening and closing
positions;
said offset providing a shoulder which engages said lever and stops
the movement thereof towards switch closing position; and
said lever being laterally movable to free it from engagement with
said shoulder and thereby permit continued movement thereof to
switch closing position.
10. The combination of claim 9, wherein said lever, when traveling
from switch closing to switch opening position, is biased into
alignment with said shoulder after passing same.
11. The combination of claim 10, wherein said lever when in the
portion of said slot means between said shoulder and switch closing
position is inherently laterally tensioned and biased in the
direction of said shoulder and moves of its own volition into
alignment with said shoulder when it passes said shoulder during
movement from switch closing to switch opening position.
12. In combination:
an electric motor;
an "On-Off" switch for said motor and operatively connected
therewith;
said switch having a movable switch-actuating element for opening
and closing said switch;
switch control means remote from said switch and movable between
switch opening and closing positions;
actuating means actuated by said control means extending between
said control means and said element and adapted to move said
element between switch closing and switch opening position in
response to said movement of said control means between said switch
closing and switch opening positions;
means providing a first straight path of travel for said control
means from switch opening position to a stop member located between
said positions which arrests the movement of said control means
towards switch closing position;
means providing a second straight path of travel for said control
means from said stop member to switch closing position;
said second path being offset from and parallel to said first path
and in communication therewith for movement of said control means
from said first path to said second path; and
said control means being laterally movable when engaged with said
stop member from said first path to said second path.
13. The combination of claim 12, wherein said lateral movement of
said control means tensions same whereby said control means, when
traveling from switch closing to switch opening position, is
automatically moved by said tension from said second path to said
first path when said control means moves past said stop member.
14. The combination of claim 13, wherein said switch includes a
depending operating arm movable between switch closing and switch
opening positions:
a wire connected to said control means and longitudinally shiftable
in response to the movement of said control means between said
positions; and
said operating arm being moved between said positions in response
to the longitudinal shifting movement of said wire.
15. In combination:
an electric motor;
an "On-Off" switch for said motor and operatively connected
therewith;
said switch having a movable switch-actuating element for opening
and closing said switch;
switch control means remote from said switch and movable between
switch opening and switch closing positions;
actuating means actuated by said control means extending between
said control means and said element and adapted to move said
element between switch closing and switch opening position in
response to said movement of said control means between said switch
closing and switch opening positions;
movable stop means interposed in the path of travel of said control
means between switch opening and switch closing positions;
said stop means when so interposed preventing said control means
from reaching said switch closing position from said switch opening
position;
said stop means being movable to a position which frees said
control means for continued travel to said switch closing position;
and
means biasing said stop means towards said interposed position.
Description
In electric rotary mowers it is desirable to be able to start and
stop the motor while standing a safe distance from the housing to
prevent the operator's feet from coming in contact with the moving
cutter blade. It is also desirable for the operator not to be
exposed to the discharge opening when starting and stopping the
motor, to avoid the possibility of being hit by an object
discharged from said opening.
It is also desirable to prevent rapid repeated movement of the
switch between "On" and "Off" positions to avoid damaging or
burning out the switch.
It is further desirable to prevent accidental starting of the mower
by inadvertent actuation of the motor switch.
Therefore, an important object of this invention is to provide a
switch control mechanism which will enable the operator to start
and stop the motor from a safe location with respect to the housing
and discharge opening and, more specifically, from a normal
operating position behind the mower handle.
Another object is to provide a switch control mechanism which
inhibits free movement of the control member between "On" and "Off"
positions to discourage playing with the switch in a manner which
might damage same, and which also prevents inadvertent starting of
the motor.
Another object is to provide remote switch control mechanism which
enables the switch itself to be located close to the motor, thereby
minimizing the amount of electric wiring needed, and enabling the
switch to be protectively located under the motor shroud.
These and other objects and advantages will more fully appear from
the following description made in connection with the accompanying
drawings wherein like reference characters refer to the same or
similar parts throughout the several views, and in which:
FIG. 1 is a perspective view of an electric mower embodying one
preferred form of the switch control mechanism of this invention,
with the shroud shown in dotted outline for clarity;
FIG. 2 is an enlarged side elevational detail view of the switch
and control mechanism therefore;
FIG. 3 is a plan view of the control lever assembly;
FIG. 4 is an end view of the control lever assembly in the "Off"
position with a portion of the casing broken away for clarity;
FIG. 5 is an end view of the control lever assembly in the "On"
position with a portion of the casing broken away;
FIG. 6 is a bottom plan view of the switch arm and the elements for
actuating same, as viewed along the line 6-6 of FIG. 2;
FIG. 7 is a side elevational view of a modified form of
switch-actuating mechanism;
FIG. 8 is a bottom plan view of the modification of FIG. 7 as
viewed along the line 8-8 thereof;
FIG. 9 is an enlarged detail top view of the control lever; and
FIG. 10 is a top plan view of a modified slot formation for
controlling the travel of the control lever.
Referring to the drawings, and initially to FIG. 1, an electric
rotary mower is shown having the usual cutter blade housing 10,
with a side discharge opening 11, ground wheels 12, and steering
handle 13.
An electric motor 14 for driving the horizontal cutter blade within
the housing is mounted on top of said housing. An "On-Off" switch
15 for the motor is mounted on a supporting plate 16 in contiguous
relation to the motor, and is positioned under the protective
shroud 17, said plate 16 being mounted on the motor.
A control panel, or escutcheon plate, 18 is mounted on the upper
end of the handle 13, which panel supports a switch control lever
19 positioned so that it is within easy reach of an operator
standing in normal operating position behind said handle. The lever
19 is operatively connected to the switch 15 (in a manner described
in more detail hereinafter) by means of a Boden wire enclosed
within a flexible sleeve or casing 20 extending between said switch
and control lever.
Thus, the motor is started and stopped by manipulation of lever 19
by the operator while standing behind the handle in a position
where his feet are not near the housing and where he cannot be hit
by objects thrown from the discharge opening.
The manner in which the lever 19 is operatively connected to the
switch 15 is best seen in FIG. 2. The switch 15 is mounted on a
raised portion 16a of the plate 16, and is secured thereto by means
of nut 21, screwed on the externally threaded cylinder 21a which
extends downwardly from the switch through the plate, with the
operating arm 22 (also known as a bat handle) of the switch
extending downwardly through cylinder 21a below the plate 16, wires
15a connecting the switch with the motor, it being understood that
arm 22 is movable back and forth to effect opening and closing of
the switch to stop and start the motor.
The flexible casing 20 is fastened to the underside of a depressed
portion 16b of the supporting plate by means of a clamp 23 which is
secured to the plate by fastening screw 24. The portion of the
casing under the plate is substantially horizontally oriented and
directed towards the switch arm 22.
A Boden wire 25 is enclosed within casing 20 and is freely movable
therewithin longitudinally thereof. The forward end of the wire
extends beyond the casing and through the switch arm 22 through an
opening provided in the lower end of said arm, the wire being
freely movable relative to the arm, and is provided with a pair of
switch-actuating stop elements 26--27 adapted to operate the switch
arm 22 (which is located between said stops) in response to
movement of the Boden wire, the forward stop 26 being adapted to
move the switch arm to the "Off" position, the rearward stop being
adapted to move the switch arm to " On" position. The stops 26--27
are adjustably secured to the Boden wire by setscrews 26a--27a,
respectively. Cushioning springs 28--29 are coiled about the Boden
wire between said stops and the switch arm, said springs also
protecting against overtravel of the lever.
The rearward end of the Boden wire is connected to the lever 19 and
operable thereby, so that when the lever is pushed to its "On"
(switch closing) position the wire is pushed forwardly carrying
with it rear stop 27 which, at the end of its travel, engages
switch 22 and pushes it forwardly to its "On" position. When the
lever 19 is pulled rearwardly from its "On" to its "Off" (switch
opening) position, the Boden wire is simultaneously pulled
rearwardly, carrying with it front stop 26 which, at the end of its
travel, engages the switch arm 22 and moves it to its "Off"
position, thus providing the desired safe remote control of the
motor switch.
The lever 19 is mounted on the control panel 18 by means of a
generally triangularly-shaped casing 30, the upper end portion 30a
of which extends above the control panel 18. The lower end of the
lever is pivotally mounted on the casing at 31, and the upper end
extends through and travels in a slot 32 provided in the top face
of the casing. The rear end of the sleeve 20 is attached to the
casing, and the rear end of the Boden wire extends beyond the
sleeve and is attached to the lever 19.
The rear (or "Off") portion 32a of the slot is wider than the
forward (or "On") portion 32b, so that a shoulder, or stop 33, is
provided between the extreme forward ("On") and rearward ("Off")
positions of the slot. The lever is offset to provide an upper
portion 19a which is offset from the lower portion 19b. The lever
also has a grip, or T handle, 19c at the upper end thereof.
The lever is mounted so that when it is in the wider rear slot
portion 32a it is in alignment with the stop 33, and naturally
assumes that position on the right side of 32a, being assisted in
this respect by a detent 34 formed on the inner wall of the casing
and extending towards and facing the lower portion 19b of the lever
when it is in slot portion 32a.
Thus, the portion of the slot directly behind the shoulder 33 and
in alignment therewith and corresponding to the width of said
shoulder represents a recess in which the upper portion 19a of the
lever is always located when the lever is in rear slot portion 32a.
This same recess represents and provides a straight track or path
of travel for the lever which is offset from and parallel to the
straight track and path of travel provided by the forward slot
portion 32b.
The lower portion 19b of the lever is coplanar with the front slot
portion 32b when the lever is in the rear slot portion 32a. To
assure that the lever will engage the stop 33 during its forward
movement, the lower leg 19b of the lever is provided with a detent
35 which extends laterally towards the casing detent 34 for
cooperative engagement therewith. As the lever approaches stop 33,
detent 35 engages and rides over detent 34, which forces or biases
the lever momentarily to the right to assure its engagement with
stop 33, detent 35 clearing detent 34 and being positioned
forwardly thereof when the lever is engaged with stop 33. The
detents 34--35 also cooperate to force the lever back into the
recess portion of slot 32a upon the return travel of the lever from
"On" to "Off" position.
In order to move the lever 19 into the offset forward slot portion
32b, the lever must be forcibly bent to the left, with the lever
being provided with enough inherent play or resiliency to enable
this to be accomplished, and is under tension when in slot portion
32b, which tension biases the lever towards the right, or recessed
"Off" position. It is preferable that a minimum of 4 pounds side
force be required at the T handle to move the lever from stop 33
into the forward slot portion 32b.
Thus, when the motor is stopped the lever 19 is in the extreme
rearward "Off" position in the right-hand or recessed part of rear
slot portion 32a. To start the motor the lever 19 is initially
pushed forwardly until it reaches stop 33, which is intermediate
the motor stopping "Off" and the motor starting "On" positions. The
lever is then forcibly pushed and bent to the left, tensioning the
lever and positioning it in slot 32b, whereupon the lever is again
pushed forwardly to the extreme forward "On" position.
To stop the motor, the lever 19 is pulled rearwardly from the
extreme forward "On" position along the slot 32b until it clears
shoulder stop 33, whereupon the tension in the lever automatically
moves the lever to the right into the right recessed portion of
slot 32a, and further rearward travel along the right recessed side
of slot 32a brings the lever to the motor stopping "Off"
position.
Thus, if the lever is accidentally bumped or pushed when in the
"Off" position, it will encounter and be stopped by stop shoulder
33 before it reaches motor starting "On" position, thereby
preventing inadvertent starting of the motor.
The intermediate stop shoulder 33 also provides a sufficient time
delay between opening and closing of the switch so that the switch
will not be damaged or burned out if someone repeatedly moves the
lever between "On" and "Off" positions in quick succession.
The stop 33 also minimizes the chances of the motor being started
by small children, since they tend to be deterred from further
effort when the lever encounters stop 33, or will simply flick the
lever back and forth between the stop and the "Off" position.
FIGS. 7 and 8 illustrate a modified form of switch-actuating
mechanism in which the stops 26--27 are eliminated, and the Boden
wire is suitably bent or deformed so that the wire itself serves as
the means for tripping the switch arm 22. In this version, the
extreme forward end of the Boden wire is bent or hooked, as at 25a,
so as to engage the switch arm and pull it to the "Off" position
when the lever 19 is pulled rearwardly to its "Off" position.
Rearwardly of the switch arm, a portion of the Boden wire is
coiled, as at 25b, which coiled portion serves to engage the switch
arm and push it forwardly to its "On" position when the lever 19 is
pushed forwardly to its "On" position. The segment of the Boden
wire between the portions 25a--25b travels freely in the opening in
the switch arm. The coiled portion also serves as a spring which
protects against overtravel of the lever in either direction.
FIG. 10 illustrates a modified slot formation designed to
accomplish the same safe interrupted lever movement hereinbefore
described. In this version, a front "On" slot 36 and a rear "Off"
slot are provided, which slots are in parallel staggered offset
overlapping relationship, with their inner adjacent ends in lateral
communication with each other so that the lever can be shifted
laterally from one slot to the other. Thus, slot 36 corresponds to
slot 32b, and slot 37 corresponds to the recessed portion of slot
32a. Slot 37 terminates forwardly at stop shoulder 38, and slot 36
terminates rearwardly at stop shoulder 41. Thus, to start the
motor, the lever 19 is pushed forwardly from its extreme rear "Off"
position in slot 37 until it encounters stop 38, where its forward
movement is arrested. It is then forced laterally to the left into
slot 36, and pushed forwardly to the extreme forward "On" position.
To stop the motor, the aforedescribed lever movement is reversed,
so that the lever first encounters stop 39, and then is shifted
laterally to the right into slot 37, and then continues rearwardly
to the "Off" position.
FIG. 10 also schematically illustrates an additional safety feature
which may be incorporated into the switch control mechanism. This
additional feature comprises a stop or keeper 39 which is mounted
alongside the slot and extends horizontally towards the opening
between the slots 36 and 37, so as to be in opposed relationship to
the lever 19 when it is positioned at stop 38. When so positioned,
it prevents the lever from being shifted into slot 36. The keeper
is pivotally mounted to enable it to be swung upwardly to a
substantially vertical nonobstructing position, so that the lever
can be moved from one slot to the other. The keeper is preferably
spring-biased downwardly by any suitable means, such as spring 40,
which automatically returns the keeper to horizontal lever
obstructing position and holds it there until it is physically
lifted. It will, of course, be understood that various changes may
be made in the form, detail, arrangement and proportion of the
parts without departing from the scope of this invention.
* * * * *