CA1083447A - Adjustment for carburetor control device - Google Patents
Adjustment for carburetor control deviceInfo
- Publication number
- CA1083447A CA1083447A CA305,373A CA305373A CA1083447A CA 1083447 A CA1083447 A CA 1083447A CA 305373 A CA305373 A CA 305373A CA 1083447 A CA1083447 A CA 1083447A
- Authority
- CA
- Canada
- Prior art keywords
- boss
- screw
- combination
- adjustment
- receiving means
- 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.)
- Expired
Links
Classifications
-
- 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
- F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
- F02M1/14—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on pressure in combustion-air- or fuel-air-mixture intake
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H41/00—Rotary fluid gearing of the hydrokinetic type
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Means For Warming Up And Starting Carburetors (AREA)
- Check Valves (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An arrangement for adjustments on carburetor control devices by which the adjustment is sealed to prevent unauthor-ized readjustment, leakage or accidental movement out of ad-justment by the use of a heat shrinkable tube or cap shrunk into contact with both the adjustment and associated structure to prevent relative movement.
An arrangement for adjustments on carburetor control devices by which the adjustment is sealed to prevent unauthor-ized readjustment, leakage or accidental movement out of ad-justment by the use of a heat shrinkable tube or cap shrunk into contact with both the adjustment and associated structure to prevent relative movement.
Description
83~47 .~, , ".
This invention relates to carburetor control devices and particularly to adjustments on such devices which are tam-per proof, leak proof and locked in adjusted position.
Carburetors for use with the internal combustion engines on automobiles have various adjustments and controls which require adjustment. For example, vacuum break devices in the form of servo motors are used in conjunction with carbure-tors to open the automatic choke valve immediately after start-ing to prevent the engine from stalling. The amount that the choke valve can be opened on various models of engines and type of vehicles varies and usually is adjusted to some preselected -position at the time of manufacture. Once such adjustment is made it is desirable that it be accurately maintained and not subject to change due to vibration of the engine or tampering - 15 by unauthorized or inexperienced mechanics. Moreover, control devices such as vacuum breaks are operated by pressure differ-entials and adjusting devices such as adjusting screws may pass through walls subject to differential pressure and therefore are subject to leakage.
Adjustment of control devices such as vacuum break ~ ;
servo motors are necessary because the same device may be used on different carburetors, different engines or different vehicles . ~, . .
and it is desirable to provide means to adjust the vacuum break , to permit one device to be used in varying applications. ; ~ ;
It is an object of the present invention to provide a vacuum break device having an adjustment which can be locked in its adjusted position.
Still another object of the invention is to provide a vacuum break device with an adjustment which may be sealed against leakage.
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33~47 : .
A-363 SCHMELZER CORPORATION :
The invention includes a device having an adjusting screw passing through a wall member wherein a boss is formed on and is rigid with the wall, threads being formed in said boss, a screw member rotatably engaged with the threads, tool receiving means formed at one end of the screw member, the tool receiving means having an irregular surface portion, the boss having another ra-dially outwardly extending irregular surface portion, and a tube member of heat shrinkable material disposed on the screw and the boss and being shrunk in fluid tight, conforming engagement to the irregular surface portion of the tool receiving means and the boss to prevent access to the tool receiving means and relative rota- -tion of the screw and boss.
These and other objects and advantages of this in-vention will be apparent from the following description and from the accompanying drawings in which:
Figure 1 is a sectional view of a vacuum break de-vice incorporating the adjusting feature of the present inven-tion;
Figure 2 is a cross-sectional view taken on line 2 2 in Figure l;
Figure 3 is a cross-sectional view of a portion of ~ -the structure seen in Figure 1 with a plastic tube in position ready for shrinking;
Pigure 4 is a view similar to Figure 3 showing the -condition of the part after the tube has been shrunk; and Figure 5 is a view similar to Figure 3 showing a cap in position ready for shrinking.
Referring now to the drawings, a vacuum break or servo motor 10 includes a housing 12 made up of a pair of generally cup-shaped front and back covers 14 and 16, respect-..
~. 3LC~33~7 ively. A flexible diaphragm 18 has its outer periphery clamped between peripheral flanges 20 and 21 of the front and rear covers 14 and 16.
A central portion of the diaphragm 18 is provided with front and rear backing plates 22 and 24 which are held to-gether in clamping relationship to the diaphragm by means of a plunger 26 which is upset as indicated at 28. The opposite end of the plunger 26 passes through an opening in the front cover 14 and is provided with a slot 30 to receive a control rod 32 connected to a choke valve 34 forming part of the carburetor.
The diaphragm 18 provides the interior of the housing 12 into a forward chamber 36 and a rearward chamber 38. The forward chamber 36 is in continuous communication with the atmosphere by way of the opening through the front cover 14 through which the plunger 26 passes. The rearward chamber 38 is subject to variable pressure and communicates by way of the in-let 40 a source of vacuum such as the intake manifold of an in-ternal combustion engine, not shown. When the engine is started, air at atmospheric pressure in the chamber 38 is replaced by vacuum and as a result of the differential in pressures in the forward and rearward chambers 36 and 38, the plunger 26 is moved to the left as viewed in the drawings to open the choke valve 34.
The stroke of the plunger 26 or the extent of move-ment to the left as viewed in Figure 1 is limited by an adjust-ment mechanism designated in its entirety at 42. The adjust-ment includes an adjustment screw 44 having a threaded shank 45 threadably engaged in a collar member 46 having a tubular por-tion 48 press fit into an opening formed by an angular flange 50. The collar 46 also includes a radial extending flange 51 ;~
: ' ' ': , .
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~ 13344~
and an irregularly shaped boss 52 which in the present in-stance is formed in the shape of a hexigon. The adjustment screw 44 is rotated to move the screw axially to change the position of the end 54 which engages the upset portion 28 of the diaphragm assembly to limit stroke of the vacuum break unit.
After the appropriate setting of the vacuum break unit is achieved by positioning the adjusting screw 44 to determine the maximum opening of the choke valve, the exposed head 55 and threads at the exterior of the housing 12 as well as the boss 52 are encapsulated in heat shrinkable plastic material. ~-After the screw adjustment is completed, a tube 56 of heat shrinkable material as shown in Figure 3 or a cap 58 as shown in Figure 5 are slipped over the adjustment screw 44 and the boss 52. For this purpose the internal diameter of the tube 56 and cap 58 are slightly larger than the major dimension of the screw head 55 or of the boss 52. Subsequently the tube 56 or cap 58 may be shrunk by the application of heat or the like so that they grip the boss 52, the exposed threads of the adjustment screw 44 and the screw head 55 as shown in Figures 1 and 4.
The-tube 56 and cap 58 can be of any suitable shrink-able plastic of which there are a variety of examples. One material for example, is mechanically expanded polyethylene which has a plastic memory. Such material will shrink when heated tending to recover its original dimensions prior to expansion. Upon heating and consequent shrinking, the tube 56 and cap 58 will tightly clamp the boss 52 and the screw head 55 as well as the exposed threads therebetween provided that ~` 1~83~47 the internal diameter of the tube 56 and cap 58 are less than the external diameter of the screw piror to the time that the tube or cap are expanded. Still other shrinkable materials may be used which also shrink upon application of heat or upon removal of the swelling agent or which shrink upon ex-posure to air.
It will be noted that with either the tube 56 or cap 58 shrunk into place on the adjusting screw 44, that a tool such as a screwdriver, now shown, would not be effectively engaged in the slot 62 in the screw head 55 so that unauthorized adjust-ment would not be easily achieved. Also the tight engagement of the shrinkable tube 56 and cap 58 with the irregular surface of screw head 55 and the irregular surface of boss 52 prevents relative rotation and loosening of the screw 44. The same gripping action acts as a fluid seal around the threads of the screw and eliminates the need for o-rings or other seals since the shrunk plastic material tightly engages the contained sur-faces and prevents atmospheric air from entering the rearward chamber 38 during operation of the servo motor 10.
A lock and seal arrangement for adjustable control devices such as those used on carburetors has been provided in which the adjusting member is threaded into a mounting member and both the threaded member and the mounting member have ir-regular surfaces which are engaged by the tube or tubular cap of heat shrinkable material so that the members are prevented from rotating relative to each other, so that access to make adjustment to the member is obstructed and so that the adjust-able member is sealed relative to its supporting structure to prevent the leakage of air.
'~
- 5 - . ::
This invention relates to carburetor control devices and particularly to adjustments on such devices which are tam-per proof, leak proof and locked in adjusted position.
Carburetors for use with the internal combustion engines on automobiles have various adjustments and controls which require adjustment. For example, vacuum break devices in the form of servo motors are used in conjunction with carbure-tors to open the automatic choke valve immediately after start-ing to prevent the engine from stalling. The amount that the choke valve can be opened on various models of engines and type of vehicles varies and usually is adjusted to some preselected -position at the time of manufacture. Once such adjustment is made it is desirable that it be accurately maintained and not subject to change due to vibration of the engine or tampering - 15 by unauthorized or inexperienced mechanics. Moreover, control devices such as vacuum breaks are operated by pressure differ-entials and adjusting devices such as adjusting screws may pass through walls subject to differential pressure and therefore are subject to leakage.
Adjustment of control devices such as vacuum break ~ ;
servo motors are necessary because the same device may be used on different carburetors, different engines or different vehicles . ~, . .
and it is desirable to provide means to adjust the vacuum break , to permit one device to be used in varying applications. ; ~ ;
It is an object of the present invention to provide a vacuum break device having an adjustment which can be locked in its adjusted position.
Still another object of the invention is to provide a vacuum break device with an adjustment which may be sealed against leakage.
' ', ', .
- 1- .
~ ' ., .
: . ; . . . . ::, .: : . : : .. .;: .. . .. . : . . , :
f"
33~47 : .
A-363 SCHMELZER CORPORATION :
The invention includes a device having an adjusting screw passing through a wall member wherein a boss is formed on and is rigid with the wall, threads being formed in said boss, a screw member rotatably engaged with the threads, tool receiving means formed at one end of the screw member, the tool receiving means having an irregular surface portion, the boss having another ra-dially outwardly extending irregular surface portion, and a tube member of heat shrinkable material disposed on the screw and the boss and being shrunk in fluid tight, conforming engagement to the irregular surface portion of the tool receiving means and the boss to prevent access to the tool receiving means and relative rota- -tion of the screw and boss.
These and other objects and advantages of this in-vention will be apparent from the following description and from the accompanying drawings in which:
Figure 1 is a sectional view of a vacuum break de-vice incorporating the adjusting feature of the present inven-tion;
Figure 2 is a cross-sectional view taken on line 2 2 in Figure l;
Figure 3 is a cross-sectional view of a portion of ~ -the structure seen in Figure 1 with a plastic tube in position ready for shrinking;
Pigure 4 is a view similar to Figure 3 showing the -condition of the part after the tube has been shrunk; and Figure 5 is a view similar to Figure 3 showing a cap in position ready for shrinking.
Referring now to the drawings, a vacuum break or servo motor 10 includes a housing 12 made up of a pair of generally cup-shaped front and back covers 14 and 16, respect-..
~. 3LC~33~7 ively. A flexible diaphragm 18 has its outer periphery clamped between peripheral flanges 20 and 21 of the front and rear covers 14 and 16.
A central portion of the diaphragm 18 is provided with front and rear backing plates 22 and 24 which are held to-gether in clamping relationship to the diaphragm by means of a plunger 26 which is upset as indicated at 28. The opposite end of the plunger 26 passes through an opening in the front cover 14 and is provided with a slot 30 to receive a control rod 32 connected to a choke valve 34 forming part of the carburetor.
The diaphragm 18 provides the interior of the housing 12 into a forward chamber 36 and a rearward chamber 38. The forward chamber 36 is in continuous communication with the atmosphere by way of the opening through the front cover 14 through which the plunger 26 passes. The rearward chamber 38 is subject to variable pressure and communicates by way of the in-let 40 a source of vacuum such as the intake manifold of an in-ternal combustion engine, not shown. When the engine is started, air at atmospheric pressure in the chamber 38 is replaced by vacuum and as a result of the differential in pressures in the forward and rearward chambers 36 and 38, the plunger 26 is moved to the left as viewed in the drawings to open the choke valve 34.
The stroke of the plunger 26 or the extent of move-ment to the left as viewed in Figure 1 is limited by an adjust-ment mechanism designated in its entirety at 42. The adjust-ment includes an adjustment screw 44 having a threaded shank 45 threadably engaged in a collar member 46 having a tubular por-tion 48 press fit into an opening formed by an angular flange 50. The collar 46 also includes a radial extending flange 51 ;~
: ' ' ': , .
,.'' ' ." ,' .. , , : ' ': : .. . . . ' . ', ..... :
.. : : ... . ..
~ 13344~
and an irregularly shaped boss 52 which in the present in-stance is formed in the shape of a hexigon. The adjustment screw 44 is rotated to move the screw axially to change the position of the end 54 which engages the upset portion 28 of the diaphragm assembly to limit stroke of the vacuum break unit.
After the appropriate setting of the vacuum break unit is achieved by positioning the adjusting screw 44 to determine the maximum opening of the choke valve, the exposed head 55 and threads at the exterior of the housing 12 as well as the boss 52 are encapsulated in heat shrinkable plastic material. ~-After the screw adjustment is completed, a tube 56 of heat shrinkable material as shown in Figure 3 or a cap 58 as shown in Figure 5 are slipped over the adjustment screw 44 and the boss 52. For this purpose the internal diameter of the tube 56 and cap 58 are slightly larger than the major dimension of the screw head 55 or of the boss 52. Subsequently the tube 56 or cap 58 may be shrunk by the application of heat or the like so that they grip the boss 52, the exposed threads of the adjustment screw 44 and the screw head 55 as shown in Figures 1 and 4.
The-tube 56 and cap 58 can be of any suitable shrink-able plastic of which there are a variety of examples. One material for example, is mechanically expanded polyethylene which has a plastic memory. Such material will shrink when heated tending to recover its original dimensions prior to expansion. Upon heating and consequent shrinking, the tube 56 and cap 58 will tightly clamp the boss 52 and the screw head 55 as well as the exposed threads therebetween provided that ~` 1~83~47 the internal diameter of the tube 56 and cap 58 are less than the external diameter of the screw piror to the time that the tube or cap are expanded. Still other shrinkable materials may be used which also shrink upon application of heat or upon removal of the swelling agent or which shrink upon ex-posure to air.
It will be noted that with either the tube 56 or cap 58 shrunk into place on the adjusting screw 44, that a tool such as a screwdriver, now shown, would not be effectively engaged in the slot 62 in the screw head 55 so that unauthorized adjust-ment would not be easily achieved. Also the tight engagement of the shrinkable tube 56 and cap 58 with the irregular surface of screw head 55 and the irregular surface of boss 52 prevents relative rotation and loosening of the screw 44. The same gripping action acts as a fluid seal around the threads of the screw and eliminates the need for o-rings or other seals since the shrunk plastic material tightly engages the contained sur-faces and prevents atmospheric air from entering the rearward chamber 38 during operation of the servo motor 10.
A lock and seal arrangement for adjustable control devices such as those used on carburetors has been provided in which the adjusting member is threaded into a mounting member and both the threaded member and the mounting member have ir-regular surfaces which are engaged by the tube or tubular cap of heat shrinkable material so that the members are prevented from rotating relative to each other, so that access to make adjustment to the member is obstructed and so that the adjust-able member is sealed relative to its supporting structure to prevent the leakage of air.
'~
- 5 - . ::
Claims (4)
1. In a device having an adjusting screw passing through a wall member, the combination of; a boss formed on and being rigid with said wall, threads formed in said boss, a screw member rotatably engaged with said threads, tool receiving means formed at one end of said screw member, said tool receiving means having an irregular surface portion, said boss having another radially outward irregular surface portion, and a tube member of heat shrinkable material disposed on said screw and said boss and being shrunk in fluid tight, conforming engagement to said ir-regular surface portions of said tool receing means and said boss to prevent access to said tool receiving means and relative rotation of said screw and boss.
2. The combination of Claim 1 wherein said tube mem-ber of heat shrinkable plastic material initially has an in-ternal diameter larger than the diameter of said adjustable mem-ber or the diameter of said boss and has a length greater than the length of the portion of said adjustable member projecting from said boss.
3. The combination of Claim 1 in which said member is a tubular cap having a closed end and being disposable on said adjustable member and said boss.
4. The combination of Claim 1 wherein said device is a reciprocating vacuum operated servo motor having a housing formed in part by said wall member, said screw member forming a stop for limiting the stroke of said servo motor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84831777A | 1977-11-03 | 1977-11-03 | |
| US848,317 | 1977-11-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1083447A true CA1083447A (en) | 1980-08-12 |
Family
ID=25302960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA305,373A Expired CA1083447A (en) | 1977-11-03 | 1978-06-13 | Adjustment for carburetor control device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5467829A (en) |
| CA (1) | CA1083447A (en) |
| DE (1) | DE2843497A1 (en) |
| FR (1) | FR2408041A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5514008U (en) * | 1978-07-12 | 1980-01-29 | ||
| CA1130668A (en) * | 1979-07-23 | 1982-08-31 | Charles A. Detweiler | Control motor for carburetors |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB832019A (en) * | 1957-10-14 | 1960-04-06 | Girdlestone Pumps Ltd | Improvements in or relating to safety nuts or nut blanks for rotary shaft operated or actuated devices |
| FR2038742A5 (en) * | 1969-03-27 | 1971-01-08 | Mecanique Appliquee | |
| US3837322A (en) * | 1973-07-30 | 1974-09-24 | Honda Motor Co Ltd | Carburetor choke |
| US3965223A (en) * | 1974-09-18 | 1976-06-22 | Schmelzer Corporation | Charge forming device |
| GB1529351A (en) * | 1975-01-10 | 1978-10-18 | Raychem Sa Nv | Heatrecoverable articles |
-
1978
- 1978-06-13 CA CA305,373A patent/CA1083447A/en not_active Expired
- 1978-07-06 FR FR7820205A patent/FR2408041A1/en active Pending
- 1978-09-05 JP JP10819278A patent/JPS5467829A/en active Pending
- 1978-10-05 DE DE19782843497 patent/DE2843497A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5467829A (en) | 1979-05-31 |
| FR2408041A1 (en) | 1979-06-01 |
| DE2843497A1 (en) | 1979-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |