CA2938774C - A small engine combination switch - Google Patents
A small engine combination switch Download PDFInfo
- Publication number
- CA2938774C CA2938774C CA2938774A CA2938774A CA2938774C CA 2938774 C CA2938774 C CA 2938774C CA 2938774 A CA2938774 A CA 2938774A CA 2938774 A CA2938774 A CA 2938774A CA 2938774 C CA2938774 C CA 2938774C
- Authority
- CA
- Canada
- Prior art keywords
- switch
- choke
- knob assembly
- fuel
- rail
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000446 fuel Substances 0.000 claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 239000011148 porous material Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000010763 heavy fuel oil Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/02—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by hand, foot, or like operator controlled initiation means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G7/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with one single controlled member; Details thereof
- G05G7/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with one single controlled member; Details thereof characterised by special provisions for conveying or converting motion, or for acting at a distance
- G05G7/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with one single controlled member; Details thereof characterised by special provisions for conveying or converting motion, or for acting at a distance altering the ratio of motion or force between controlling member and controlled member as a function of the position of the controlling member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
- F02M1/02—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
- G05G1/08—Controlling members for hand actuation by rotary movement, e.g. hand wheels
- G05G1/10—Details, e.g. of discs, knobs, wheels or handles
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
- G05G5/06—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in one or a limited number of definite positions only
- G05G5/065—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in one or a limited number of definite positions only using a spring-loaded ball
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Means For Warming Up And Starting Carburetors (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
A small engine control combination switch comprises a rotary knob assembly which includes on its backside a shaft operably coupled to a fuel valve, a trigger tab disposed at a peripheral location of the backside to engage an engine ON/OFF switch for stopping the engine, and a circumferentially extending rail with gradually increasing height for adjusting position of a choke via a choke cable which is supported for contact with the rail of the knob assembly.
Description
A SMALL ENGINE COMBINATION SWITCH
FIELD OF THE INVENTION
The invention relates generally to a portable internal combustion engine.
BACKGROUND
Internal combustion engines and equipment driven thereby provide one form of temporary yet reliable power, which is also mobile or portable, that is usable in many fields or industries including in hospitals, hotels, construction, environmental protection and even in residential use settings. Such internal combustion engines may be fueled by gasoline, diesel oil, natural gas or liquefied petroleum gas.
One drawback of small internal combustion engines, including equipment driven thereby, relates to the operation and efficiency thereof. More specifically, a choke, fuel valve and ON/OFF switch are designed as separate independently operable components even though they cooperate for several functions. For example, to start the engine, firstly the ON/OFF switch is opened, secondly the engine is choked, and thirdly the fuel valve is opened (either manually or via an electric switch).
In another example, to turn off the engine, both the ON/OFF switch and the fuel valve are closed;
otherwise, an open fuel valve may lead to fuel leakage and consequently form a fire hazard. In yet another example, for prolonged storage, it is often necessary to use a tool to manually drain the fuel from the carburetor float bowl, else the residual fuel may become form a gummy sticky material which may spoil the carburetor.
SUMMARY OF THE INVENTION
It is therefore one aspect of the invention to provide a control combination switch for a small engine.
According to an aspect of the invention there is provided a small engine control combination switch comprises a rotary knob assembly which includes on its
FIELD OF THE INVENTION
The invention relates generally to a portable internal combustion engine.
BACKGROUND
Internal combustion engines and equipment driven thereby provide one form of temporary yet reliable power, which is also mobile or portable, that is usable in many fields or industries including in hospitals, hotels, construction, environmental protection and even in residential use settings. Such internal combustion engines may be fueled by gasoline, diesel oil, natural gas or liquefied petroleum gas.
One drawback of small internal combustion engines, including equipment driven thereby, relates to the operation and efficiency thereof. More specifically, a choke, fuel valve and ON/OFF switch are designed as separate independently operable components even though they cooperate for several functions. For example, to start the engine, firstly the ON/OFF switch is opened, secondly the engine is choked, and thirdly the fuel valve is opened (either manually or via an electric switch).
In another example, to turn off the engine, both the ON/OFF switch and the fuel valve are closed;
otherwise, an open fuel valve may lead to fuel leakage and consequently form a fire hazard. In yet another example, for prolonged storage, it is often necessary to use a tool to manually drain the fuel from the carburetor float bowl, else the residual fuel may become form a gummy sticky material which may spoil the carburetor.
SUMMARY OF THE INVENTION
It is therefore one aspect of the invention to provide a control combination switch for a small engine.
According to an aspect of the invention there is provided a small engine control combination switch comprises a rotary knob assembly which includes on its
2 backside a shaft operably coupled to a fuel valve, a trigger tab disposed at a peripheral location of the backside to engage an engine ON/OFF switch for stopping the engine, and a circumferentially extending rail with gradually increasing height for adjusting position of a choke via a choke cable which is supported for contact with the rail of the knob assembly.
According to another aspect of the invention there is provided a small engine control combination switch comprising:
a knob assembly;
a bracket rotatably supporting the knob assembly on one side of the bracket;
a choke cable supported on an opposite side of the bracket and operably coupled to the knob assembly for controlling a choke of an engine;
the knob assembly including:
a front gripping portion on a front side of the knob assembly;
a backside portion of the knob assembly comprising a central shaft about which the knob assembly is rotatable, and a rail disposed at a peripheral location of a backside of the knob assembly and extending about a circumference of the backside portion of the knob assembly;
the rail of the knob assembly being disposed in contact with a tip of the choke cable via a first hole defined in the bracket;
the rail having an increasing height relative to the backside of the knob assembly about the circumference of the backside portion of the knob assembly such that rotation of the knob assembly acts to drive the tip of the choke cable towards and away from the knob assembly.
Preferably, the switch further includes a fuel valve which is operably
According to another aspect of the invention there is provided a small engine control combination switch comprising:
a knob assembly;
a bracket rotatably supporting the knob assembly on one side of the bracket;
a choke cable supported on an opposite side of the bracket and operably coupled to the knob assembly for controlling a choke of an engine;
the knob assembly including:
a front gripping portion on a front side of the knob assembly;
a backside portion of the knob assembly comprising a central shaft about which the knob assembly is rotatable, and a rail disposed at a peripheral location of a backside of the knob assembly and extending about a circumference of the backside portion of the knob assembly;
the rail of the knob assembly being disposed in contact with a tip of the choke cable via a first hole defined in the bracket;
the rail having an increasing height relative to the backside of the knob assembly about the circumference of the backside portion of the knob assembly such that rotation of the knob assembly acts to drive the tip of the choke cable towards and away from the knob assembly.
Preferably, the switch further includes a fuel valve which is operably
3 coupled with the shaft of the knob assembly via a second hole defined in the bracket so as to control on and off states of the fuel valve.
Preferably, the switch further includes a trigger tab disposed at a peripheral location of a backside of the knob assembly.
Preferably, the switch further includes an engine ON/OF F switch operatively coupled to the engine to control an on-off state of the engine, and the trigger tab is arranged to contact the engine ON/OFF switch upon rotation of the knob assembly so that the knob assembly is operable to control the on-off state of the engine.
In the illustrated embodiment, with respect to a circumferential direction of the knob assembly, the trigger tab is disposed adjacent a minimum height end of the rail.
Preferably, the switch further includes a choke wire guide mounted to the bracket, which carries the choke cable.
Preferably, the switch further includes a stopper plate mounted in fixed relation to the fuel valve, a spring supported at one end on the stopper plate, a steel ball which is carried at an opposite end of the spring in opposite relation to the stopper plate, and the backside portion of the knob assembly defining sockets disposed at angularly spaced locations of the shaft and having smaller diameters than a diameter of the steel ball such that the steel ball is biased by the spring to be received in a select one of the sockets to define predetermined rotational positions of the knob assembly relative to the bracket.
Preferably, the bracket includes a panel and the knob assembly is arranged in the panel.
In the illustrated embodiment, the rail comprises a first portion having the increasing height which increases from a minimum height of the rail to a maximum
Preferably, the switch further includes a trigger tab disposed at a peripheral location of a backside of the knob assembly.
Preferably, the switch further includes an engine ON/OF F switch operatively coupled to the engine to control an on-off state of the engine, and the trigger tab is arranged to contact the engine ON/OFF switch upon rotation of the knob assembly so that the knob assembly is operable to control the on-off state of the engine.
In the illustrated embodiment, with respect to a circumferential direction of the knob assembly, the trigger tab is disposed adjacent a minimum height end of the rail.
Preferably, the switch further includes a choke wire guide mounted to the bracket, which carries the choke cable.
Preferably, the switch further includes a stopper plate mounted in fixed relation to the fuel valve, a spring supported at one end on the stopper plate, a steel ball which is carried at an opposite end of the spring in opposite relation to the stopper plate, and the backside portion of the knob assembly defining sockets disposed at angularly spaced locations of the shaft and having smaller diameters than a diameter of the steel ball such that the steel ball is biased by the spring to be received in a select one of the sockets to define predetermined rotational positions of the knob assembly relative to the bracket.
Preferably, the bracket includes a panel and the knob assembly is arranged in the panel.
In the illustrated embodiment, the rail comprises a first portion having the increasing height which increases from a minimum height of the rail to a maximum
4 height of the rail relative to the backside of the knob assembly and a second portion of the rail having a uniform height equal to the maximum height of the rail.
Advantages of such arrangements of the present invention include:
1. Rotation of the knob assembly can alone act to control the choke, the fuel valve and the engine ON/OFF switch which simplifies operation and improves efficiency;
2. The function of burning residual fuel in the carburetor is incorporated into the switch so that a manual drain of the carburetor is not separately necessitated when it is desired to store the engine for a prolonged period of time;
3. A simple and compact structure providing convenient, safe and reliable operation and that is widely applicable in small engines and equipment driven thereby is provided.
According to another aspect of the invention there is provided a small engine control combination switch comprising:
a fuel switch;
a bracket having a first hole and a second hole;
a knob assembly comprising a fixed plate, a rotating shaft which passes through the second hole to connect with the fuel switch for driving the fuel switch on or off;
an engine controlling means comprising a convex block on the fixed plate, an ON/OFF switch arranged on the bracket, the ON/OFF switch is matched with the convex block to control the engine;
a choke controlling means comprising a rail on the fixed plate, a choke wire guide is provided on the bracket, a choke cable is in the choke wire guide and passes the first hole to contact with the rail, a reset spring is installed at an end of the Date Recue/Date Received 2021-02-02 4a choke cable for making the end of the choke cable to keep touch on the rail, the rail is gradually increased in height, when the fixed plate of the knob assembly is turned the rail is turned too, thereby the rail drives the choke cable to move up and down to control the choke;
the bracket is provided with a panel and the knob assembly is set within the panel, the panel is marked with labels of Start, Run, Run Out of Fuel and Stop;
when the knob assembly is in the Start position, the fuel switch has been partially open, the choke in a fully closed state, the ON/OFF switch is in an off state;
when the knob assembly is within a scope from the Start to Run, the fuel switch and the choke gradually opened to the maximum position, arbitrary positions within this range;
when the knob assembly is in the Run position, the choke and fuel switch fully open;
when the knob assembly is in the Fuel Shut-Off position, the fuel switch is fully closed, the choke valve remains fully open, the engine continues to run, carburetor fuel is burnt, thus avoiding use of tools to manually put the carburetor fuel out;
when the knob assembly is in the Stop Position, the ON/OFF switch is contacted by the convex block to be turned on to make the engine flameout.
In one embodiment, the small engine control combination switch comprises a stopper plate is on the fuel switch, a spring is arranged on the stopper plate, a steel ball is arranged on the spring, a plurality of grooves are in the fixed plate, which are matched with the steel ball respectively, and an outer diameter of the steel ball is larger than a pore diameter of the groove.
Date Recue/Date Received 2021-02-02 4b BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in conjunction with the accompanying drawings in which:
Figure 1 is a schematic view of an arrangement of the present invention;
Figure 2 is an exploded view of the arrangement of Figure 1;
Figure 3 is a schematic view of a knob assembly of the arrangement of Figure 1; and Figure 4 is a schematic view of a panel of the arrangement of Figure 1.
In the drawings like characters of reference indicate corresponding parts in the different figures.
Also, in the above mentioned drawings, the following parts are identified by the corresponding reference numerals: 1-knob assembly, 101-rail, 102-rotating shaft, 103-sockets, 104-fixed plate, 105-trigger tab, 106-rotating part, 2-bracket, 201-Date Recue/Date Received 2021-02-02 i
Advantages of such arrangements of the present invention include:
1. Rotation of the knob assembly can alone act to control the choke, the fuel valve and the engine ON/OFF switch which simplifies operation and improves efficiency;
2. The function of burning residual fuel in the carburetor is incorporated into the switch so that a manual drain of the carburetor is not separately necessitated when it is desired to store the engine for a prolonged period of time;
3. A simple and compact structure providing convenient, safe and reliable operation and that is widely applicable in small engines and equipment driven thereby is provided.
According to another aspect of the invention there is provided a small engine control combination switch comprising:
a fuel switch;
a bracket having a first hole and a second hole;
a knob assembly comprising a fixed plate, a rotating shaft which passes through the second hole to connect with the fuel switch for driving the fuel switch on or off;
an engine controlling means comprising a convex block on the fixed plate, an ON/OFF switch arranged on the bracket, the ON/OFF switch is matched with the convex block to control the engine;
a choke controlling means comprising a rail on the fixed plate, a choke wire guide is provided on the bracket, a choke cable is in the choke wire guide and passes the first hole to contact with the rail, a reset spring is installed at an end of the Date Recue/Date Received 2021-02-02 4a choke cable for making the end of the choke cable to keep touch on the rail, the rail is gradually increased in height, when the fixed plate of the knob assembly is turned the rail is turned too, thereby the rail drives the choke cable to move up and down to control the choke;
the bracket is provided with a panel and the knob assembly is set within the panel, the panel is marked with labels of Start, Run, Run Out of Fuel and Stop;
when the knob assembly is in the Start position, the fuel switch has been partially open, the choke in a fully closed state, the ON/OFF switch is in an off state;
when the knob assembly is within a scope from the Start to Run, the fuel switch and the choke gradually opened to the maximum position, arbitrary positions within this range;
when the knob assembly is in the Run position, the choke and fuel switch fully open;
when the knob assembly is in the Fuel Shut-Off position, the fuel switch is fully closed, the choke valve remains fully open, the engine continues to run, carburetor fuel is burnt, thus avoiding use of tools to manually put the carburetor fuel out;
when the knob assembly is in the Stop Position, the ON/OFF switch is contacted by the convex block to be turned on to make the engine flameout.
In one embodiment, the small engine control combination switch comprises a stopper plate is on the fuel switch, a spring is arranged on the stopper plate, a steel ball is arranged on the spring, a plurality of grooves are in the fixed plate, which are matched with the steel ball respectively, and an outer diameter of the steel ball is larger than a pore diameter of the groove.
Date Recue/Date Received 2021-02-02 4b BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in conjunction with the accompanying drawings in which:
Figure 1 is a schematic view of an arrangement of the present invention;
Figure 2 is an exploded view of the arrangement of Figure 1;
Figure 3 is a schematic view of a knob assembly of the arrangement of Figure 1; and Figure 4 is a schematic view of a panel of the arrangement of Figure 1.
In the drawings like characters of reference indicate corresponding parts in the different figures.
Also, in the above mentioned drawings, the following parts are identified by the corresponding reference numerals: 1-knob assembly, 101-rail, 102-rotating shaft, 103-sockets, 104-fixed plate, 105-trigger tab, 106-rotating part, 2-bracket, 201-Date Recue/Date Received 2021-02-02 i
5 first hole, 202-second hole, 3-nut, 4-choke cable, 41-choke cable guide, 5-fuel valve,
6-stopper plate, 7-spring, 8-steel ball, 9-ON/OFF switch, 10- panel.
DETAILED DESCRIPTION
Reference is made to the accompanying drawings in which is shown an illustrative embodiment of the invention from which its features and advantages will be apparent.
A small engine control combination switch includes a knob assembly 1, a bracket 2 rotatably supporting the knob assembly 1 on one side of the bracket, and a choke cable 4 supported on an opposite side of the bracket 2 and operably coupled to the knob assembly 1 for controlling a choke of an engine (not shown). The knob assembly 1 comprises a front gripping portion 106 on a front side of the knob assembly and a backside portion 104 of the knob assembly 1 which includes a central shaft 102, a trigger tab 105 disposed at a peripheral location of a backside of the knob assembly 1, and a rail 101 disposed at a peripheral location of the backside of the knob assembly .. 1 and extending about a circumference of the backside portion of the knob assembly.
The rail 101 of the knob assembly 1 is disposed in contact with a tip of the choke cable 4 via a first hole 201 defined in the bracket 2. The rail 101 has a gradually increasing height relative to the backside of the knob assembly 1 about the circumference of the backside portion 104 of the knob assembly 1 such that rotation of the knob assembly 1 which is actuated by a user at the front gripping portion 106 acts to drive the tip of the choke cable 4 towards and away from the knob assembly, for example up and down.
The switch further includes a choke wire guide 41 mounted to the bracket 2, which carries the choke cable 4. A reset spring is installed at the end of choke cable 4 so that the point of contact between the choke cable 4 and the rail 101 is maintained in sliding .. contact, so as to control opening and closing of the choke'.
Also, the switch further includes a fuel valve 5 which is operably coupled with the shaft 102 of the knob assembly 1 via a second hole 202 defined in the bracket 2 so as to control on and off states of the fuel valve 5.
The bracket 2 is provided with a panel 10 and the knob assembly is set within the panel 10 so as to be arranged in the panel 10. The panel 10 is marked at various angularly spaced locations about the knob assembly 1 with labels including "Start", "Run", "Run Out of Fuel" and "Stop".
The switch also includes an engine ON/OFF switch 9 which is operatively coupled to the engine to control an on-off state of the engine and is arranged for contact with the trigger tab 105 so that the knob assembly is operable to control the on-off state of the engine. The ON/OFF switch 9 may be mounted on the bracket 2. Upon rotation of the knob assembly 1 via the front gripping portion 106, the trigger tab 105 on the backside portion 104 contacts the ON/OFF switch 9 to control the engine. When the trigger tab 105 and ON/OFF switch engage, the ON/OFF switch 9 is turned on, and consequently the engine turns off.
As more clearly shown in Figure 2, there is provided a stopper plate 6 in the form of a bracket mounted in fixed relation to the fuel valve 5, a spring
DETAILED DESCRIPTION
Reference is made to the accompanying drawings in which is shown an illustrative embodiment of the invention from which its features and advantages will be apparent.
A small engine control combination switch includes a knob assembly 1, a bracket 2 rotatably supporting the knob assembly 1 on one side of the bracket, and a choke cable 4 supported on an opposite side of the bracket 2 and operably coupled to the knob assembly 1 for controlling a choke of an engine (not shown). The knob assembly 1 comprises a front gripping portion 106 on a front side of the knob assembly and a backside portion 104 of the knob assembly 1 which includes a central shaft 102, a trigger tab 105 disposed at a peripheral location of a backside of the knob assembly 1, and a rail 101 disposed at a peripheral location of the backside of the knob assembly .. 1 and extending about a circumference of the backside portion of the knob assembly.
The rail 101 of the knob assembly 1 is disposed in contact with a tip of the choke cable 4 via a first hole 201 defined in the bracket 2. The rail 101 has a gradually increasing height relative to the backside of the knob assembly 1 about the circumference of the backside portion 104 of the knob assembly 1 such that rotation of the knob assembly 1 which is actuated by a user at the front gripping portion 106 acts to drive the tip of the choke cable 4 towards and away from the knob assembly, for example up and down.
The switch further includes a choke wire guide 41 mounted to the bracket 2, which carries the choke cable 4. A reset spring is installed at the end of choke cable 4 so that the point of contact between the choke cable 4 and the rail 101 is maintained in sliding .. contact, so as to control opening and closing of the choke'.
Also, the switch further includes a fuel valve 5 which is operably coupled with the shaft 102 of the knob assembly 1 via a second hole 202 defined in the bracket 2 so as to control on and off states of the fuel valve 5.
The bracket 2 is provided with a panel 10 and the knob assembly is set within the panel 10 so as to be arranged in the panel 10. The panel 10 is marked at various angularly spaced locations about the knob assembly 1 with labels including "Start", "Run", "Run Out of Fuel" and "Stop".
The switch also includes an engine ON/OFF switch 9 which is operatively coupled to the engine to control an on-off state of the engine and is arranged for contact with the trigger tab 105 so that the knob assembly is operable to control the on-off state of the engine. The ON/OFF switch 9 may be mounted on the bracket 2. Upon rotation of the knob assembly 1 via the front gripping portion 106, the trigger tab 105 on the backside portion 104 contacts the ON/OFF switch 9 to control the engine. When the trigger tab 105 and ON/OFF switch engage, the ON/OFF switch 9 is turned on, and consequently the engine turns off.
As more clearly shown in Figure 2, there is provided a stopper plate 6 in the form of a bracket mounted in fixed relation to the fuel valve 5, a spring
7 which is supported at one end to the stopper plate 6, and a steel ball 8 which is carried at an opposite end of the spring 7 in opposite relation to the stopper plate. The spring 7 and the steel ball 8 are received in a tubular guide G formed on the bracket 2 so as to position the steel ball at a fixed location with respect to the knob assembly 1. The backside portion 104 of the knob assembly 1 defines a plurality of sockets 103 disposed at angularly spaced locations about the shaft 102. The sockets 103 are sized in diameter to be smaller than a diameter of the steel ball 8. Thus, the steel ball 8 is biased by the spring 7 against the backside portion 104 of the knob assembly 1 to cooperate with the sockets 103 formed therein to define predetermined rotational positions of the knob assembly 1 relative to the bracket 2.
A process of operating the switch includes the following:
1. Start Position In the initial position of the knob assembly 1 which is the "Start"
position, the fuel valve 5 is partially open, the choke is disposed in a fully closed state (i.e., obstructing air flow into the carburetor) and the ON/OFF switch 9 is in an off state.
Upon rotation of the knob assembly 1 from the "Start" to the "Run" position, both the fuel valve 5 and the choke gradually open to a maximum (open) position, and anywhere within this range of angular positions of the knob assembly the operator may manually or electrically start the engine according to environmental conditions.
2. Operating Position This corresponds to "Run", at which position the choke and the fuel valve 5 are fully open.
3. Storage Position The Storage Position is achieved by continuing to rotate the knob assembly 1 past "Run", whereby the fuel valve 5 closes slowly while the choke remains fully open. When the user does not intend to use the engine for an extended period of time, the knob assembly 1 may be set to the "Run Out of Fuel" position in which the fuel valve 5 is fully close yet the choke remains fully open, such that the engine continues to run until the residual fuel in the carburetor is substantially burnt off.
Thus, a step of manually draining the fuel from the carburetor, using other tools, in preparation for "storage" of the engine may be omitted.
4. Stop Position By rotating the knob assembly 1 past the "Run Out of Fuel" position
A process of operating the switch includes the following:
1. Start Position In the initial position of the knob assembly 1 which is the "Start"
position, the fuel valve 5 is partially open, the choke is disposed in a fully closed state (i.e., obstructing air flow into the carburetor) and the ON/OFF switch 9 is in an off state.
Upon rotation of the knob assembly 1 from the "Start" to the "Run" position, both the fuel valve 5 and the choke gradually open to a maximum (open) position, and anywhere within this range of angular positions of the knob assembly the operator may manually or electrically start the engine according to environmental conditions.
2. Operating Position This corresponds to "Run", at which position the choke and the fuel valve 5 are fully open.
3. Storage Position The Storage Position is achieved by continuing to rotate the knob assembly 1 past "Run", whereby the fuel valve 5 closes slowly while the choke remains fully open. When the user does not intend to use the engine for an extended period of time, the knob assembly 1 may be set to the "Run Out of Fuel" position in which the fuel valve 5 is fully close yet the choke remains fully open, such that the engine continues to run until the residual fuel in the carburetor is substantially burnt off.
Thus, a step of manually draining the fuel from the carburetor, using other tools, in preparation for "storage" of the engine may be omitted.
4. Stop Position By rotating the knob assembly 1 past the "Run Out of Fuel" position
8 to the "Stop" position, the trigger tab 105 contacts the ON/OFF switch 9, which is consequently turned on causing the engine to flameout and the device driven thereby to stop running.
Arrangements of the present invention may overcome the defects of the prior art by providing a single rotary knob assembly 1 which can realize control of the choke cable 4, fuel valve 5, and ON/OFF switch 9, thereby simplifying operation by a user of the engine by controlling all the choke, starting, running and flameout, and improving the operating efficiency, as well as incorporating a feature whereby residual fuel in the carburetor is burnt off.
As more clearly shown in Figure 3, the trigger tab 105 of the illustrated embodiment is a raised projection on the backside of the knob assembly 1,relative to the backside of the knob assembly, as measured from a flat portion 108 of the backside portion 104. The flat portion 108 defines a minimum height of the backside of the knob assembly 1 in the illustrated embodiment.
Referring to Figure 3, the sockets 103 are located generally radially inwardly of the flat portion 108, trigger tab 105 and the rail 101.
Referring to Figures 1 and 3, in the illustrated embodiment the rail 101 comprises a first height-varying portion 101A along which the height of the rail 101 increases from a minimum height of the rail to a maximum height of the rail relative to the backside of the knob assembly 1 and a second maximum height portion 101B
of the rail which has uniform height equal to the maximum height of the rail. In the illustrated embodiment, the minimum rail height is equal to the minimum height of the backside of the knob assembly as defined by the flat portion 108. The height-varying rail portion 101A is thus inclined from the minimum rail height to the maximum rail height.
Arrangements of the present invention may overcome the defects of the prior art by providing a single rotary knob assembly 1 which can realize control of the choke cable 4, fuel valve 5, and ON/OFF switch 9, thereby simplifying operation by a user of the engine by controlling all the choke, starting, running and flameout, and improving the operating efficiency, as well as incorporating a feature whereby residual fuel in the carburetor is burnt off.
As more clearly shown in Figure 3, the trigger tab 105 of the illustrated embodiment is a raised projection on the backside of the knob assembly 1,relative to the backside of the knob assembly, as measured from a flat portion 108 of the backside portion 104. The flat portion 108 defines a minimum height of the backside of the knob assembly 1 in the illustrated embodiment.
Referring to Figure 3, the sockets 103 are located generally radially inwardly of the flat portion 108, trigger tab 105 and the rail 101.
Referring to Figures 1 and 3, in the illustrated embodiment the rail 101 comprises a first height-varying portion 101A along which the height of the rail 101 increases from a minimum height of the rail to a maximum height of the rail relative to the backside of the knob assembly 1 and a second maximum height portion 101B
of the rail which has uniform height equal to the maximum height of the rail. In the illustrated embodiment, the minimum rail height is equal to the minimum height of the backside of the knob assembly as defined by the flat portion 108. The height-varying rail portion 101A is thus inclined from the minimum rail height to the maximum rail height.
9 Still referring to Figures 1 and 3, the trigger tab 105 is located adjacent a minimum height end of the rail 101, with respect to a circumferential direction of the knob assembly 1. In the illustrated embodiment the height-varying portion 101A
of the rail 101 is spaced from the trigger tab 105 by a third minimum height portion 101C of the rail which has uniform height equal to the minimum height of the rail, which is zero as the minimum rail height is equal to the minimum height of the backside of the knob assembly 1 as defined by the flat portion 108.
As such, in use, when the knob assembly 1 of the switch is arranged in the "Start" position, the minimum height portion 101C of the rail 101 is disposed in contact with the choke cable 4 corresponding to the fully closed state of the choke. As the knob assembly 1 is rotated through angular positions intermediate the "Start" and "Run" positions indicated on the panel 10 as shown more clearly in Figure 4, the height-varying portion 101A of the rail is in contact with the choke cable 4. From the "Run"
position to the "Stop" position, the maximum height portion 101B of the rail is disposed in contact with the choke cable 4. In the "Stop" position the trigger tab 105 is disposed in contact with the ON/OFF switch 9 so as to shut off the engine.
The principles and features of this invention may be employed in various and numerous embodiments without departing from the scope of the invention.
of the rail 101 is spaced from the trigger tab 105 by a third minimum height portion 101C of the rail which has uniform height equal to the minimum height of the rail, which is zero as the minimum rail height is equal to the minimum height of the backside of the knob assembly 1 as defined by the flat portion 108.
As such, in use, when the knob assembly 1 of the switch is arranged in the "Start" position, the minimum height portion 101C of the rail 101 is disposed in contact with the choke cable 4 corresponding to the fully closed state of the choke. As the knob assembly 1 is rotated through angular positions intermediate the "Start" and "Run" positions indicated on the panel 10 as shown more clearly in Figure 4, the height-varying portion 101A of the rail is in contact with the choke cable 4. From the "Run"
position to the "Stop" position, the maximum height portion 101B of the rail is disposed in contact with the choke cable 4. In the "Stop" position the trigger tab 105 is disposed in contact with the ON/OFF switch 9 so as to shut off the engine.
The principles and features of this invention may be employed in various and numerous embodiments without departing from the scope of the invention.
Claims (2)
1. A small engine control combination switch comprising:
a fuel switch;
a bracket having a first hole and a second hole;
a knob assembly comprising a fixed plate, a rotating shaft which passes through the second hole to connect with the fuel switch for driving the fuel switch on or off;
an engine controlling means comprising a convex block on the fixed plate, an ON/OFF switch arranged on the bracket, the ON/OFF switch is matched with the convex block to control the engine;
a choke controlling means comprising a rail on the fixed plate, a choke wire guide is provided on the bracket, a choke cable is in the choke wire guide and passes the first hole to contact with the rail, a reset spring is installed at an end of the choke cable for making the end of the choke cable to keep touch on the rail, the rail is gradually increased in height, when the fixed plate of the knob assembly is turned the rail is turned too, thereby the rail drives the choke cable to move up and down to control the choke;
the bracket is provided with a panel and the knob assembly is set within the panel, the panel is marked with labels of Start, Run, Run Out of Fuel and Stop;
when the knob assembly is in the Start position, the fuel switch has been partially open, the choke in a fully closed state, the ON/OFF switch is in an off state;
when the knob assembly is within a scope from the Start to Run, the fuel switch and the choke gradually opened to the maximum position, arbitrary positions within this range;
when the knob assembly is in the Run position, the choke and fuel switch fully open;
when the knob assembly is in the Fuel Shut-Off position, the fuel switch is fully closed, the choke valve remains fully open, the engine continues to run, carburetor fuel is burnt, thus avoiding use of tools to manually put the carburetor fuel out;
when the knob assembly is in the Stop Position, the ON/OFF switch is contacted by the convex block to be turned on to make the engine flameout.
a fuel switch;
a bracket having a first hole and a second hole;
a knob assembly comprising a fixed plate, a rotating shaft which passes through the second hole to connect with the fuel switch for driving the fuel switch on or off;
an engine controlling means comprising a convex block on the fixed plate, an ON/OFF switch arranged on the bracket, the ON/OFF switch is matched with the convex block to control the engine;
a choke controlling means comprising a rail on the fixed plate, a choke wire guide is provided on the bracket, a choke cable is in the choke wire guide and passes the first hole to contact with the rail, a reset spring is installed at an end of the choke cable for making the end of the choke cable to keep touch on the rail, the rail is gradually increased in height, when the fixed plate of the knob assembly is turned the rail is turned too, thereby the rail drives the choke cable to move up and down to control the choke;
the bracket is provided with a panel and the knob assembly is set within the panel, the panel is marked with labels of Start, Run, Run Out of Fuel and Stop;
when the knob assembly is in the Start position, the fuel switch has been partially open, the choke in a fully closed state, the ON/OFF switch is in an off state;
when the knob assembly is within a scope from the Start to Run, the fuel switch and the choke gradually opened to the maximum position, arbitrary positions within this range;
when the knob assembly is in the Run position, the choke and fuel switch fully open;
when the knob assembly is in the Fuel Shut-Off position, the fuel switch is fully closed, the choke valve remains fully open, the engine continues to run, carburetor fuel is burnt, thus avoiding use of tools to manually put the carburetor fuel out;
when the knob assembly is in the Stop Position, the ON/OFF switch is contacted by the convex block to be turned on to make the engine flameout.
2. The small engine control combination switch of claim 1 wherein with a stopper plate is on the fuel switch, a spring is arranged on the stopper plate, a steel ball is arranged on the spring, a plurality of grooves are in the fixed plate, which are matched with the steel ball respectively, and an outer diameter of the steel ball is larger than a pore diameter of the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2938774A CA2938774C (en) | 2016-08-10 | 2016-08-10 | A small engine combination switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2938774A CA2938774C (en) | 2016-08-10 | 2016-08-10 | A small engine combination switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2938774A1 CA2938774A1 (en) | 2018-02-10 |
| CA2938774C true CA2938774C (en) | 2021-08-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2938774A Active CA2938774C (en) | 2016-08-10 | 2016-08-10 | A small engine combination switch |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2938774C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7262240B2 (en) | 2019-02-15 | 2023-04-21 | 株式会社小松製作所 | Working machine operating device and working machine |
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2016
- 2016-08-10 CA CA2938774A patent/CA2938774C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2938774A1 (en) | 2018-02-10 |
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