US3657966A - Multi-position vacuum motor - Google Patents
Multi-position vacuum motor Download PDFInfo
- Publication number
- US3657966A US3657966A US42195A US3657966DA US3657966A US 3657966 A US3657966 A US 3657966A US 42195 A US42195 A US 42195A US 3657966D A US3657966D A US 3657966DA US 3657966 A US3657966 A US 3657966A
- Authority
- US
- United States
- Prior art keywords
- port
- diaphragm
- movable element
- end wall
- vacuum
- 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 - Lifetime
Links
- 238000013022 venting Methods 0.000 description 13
- 239000000523 sample Substances 0.000 description 7
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000027326 copulation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical class C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
- F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
- F15B11/121—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
- F15B11/126—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions by means of actuators of the standard type with special circuit controlling means
Definitions
- ABSTRACT [52] U.S.Cl ..91/357,91/395,92/99,
- a multl-posltlon vacuum motor has extending from its 51 Int. Cl ..Fl5b 9/02,F16j3/00 diaphragm actuating element Salem! length which 53 FieldofSeareh ..91/394, 395,396, 409, 357-, holdsopenacheck valveto vemthe chamberand Permitslhe diaphragm to move from the extreme position to intermediate position in a dependable way irrespective of the amount of time a remote vent valve is held open.
- the structure of the vacuum motor includes precise reliable internal control of the venting as the diaphragm is moved from extreme to intermediate position.
- FIG. I" is a somewhatschematic view of a vacuum motor embodyingthe invention and a control system therefor, all for actuating. the heater control of an automobile vehicle.
- FIG. 1' the motor andthe control valve are shown in cross section;
- FIG. Zisasectional view taken on the line 2--2 of FIG. 1;
- FIG. 3 is a sectional view taken on the line 3-3 of FIG. 1;
- FIG. 4 is an elevational view partly; in section, slightly reduced, of avmotor embodying the invention shown in intermediate position;
- FIG. .6 is a sectional view taken on the line 66 of FIG. 5;
- FIG. 7. is-a-sectional. view comparable to FIG. 6 with a different form of actuating element
- FIG. 8. is a sectional view of a modified form of motor embodying the invention showingthe motor between extreme and intermediate positions;
- FIG. 9 isa sectional view as FIG. 8- but showing the modified formin intermediate position.
- a motor embodying the'invention is generally designated 10. It is connected by appropriate tubingtoa rotary valve 12' which in turn isconnected to a vacuum source V.
- Themotor comprises a housing 14 defined by side walls 16 and a connected end wall 18.
- the ward the housing has a partial. rear wall 20toprovide stop means for the motor.
- a movable element. comprising a. roll-type diaphragm 22 is sealingly connected to the side wall 16by a flexible web 24 in a conventionalmanner.
- Spring 26 biases the diaphragm 22 away from the end wall 18 tothe position shown in FIG. 1.
- the spring is held inposition by an inclined annular shoulder 28inthe endwall l8.
- the end wall Centrally disposedin the end wall isan opening 30 to which is connecteda vacuum. source port 32.
- a rubber check valve 34 which is biased closed but which opens upon application of a vacuum to port 32.
- the check valve 34 is of the type known in the trade as duck-bill valve element which is commercially available from Vernay Laboratories, Yellow Springs, Ohio, and which comprises an integrally molded element of rubber or the like having resilient lips 34a and anannular holding flange 34b which engages about the opening30.
- a more elaborate form of a duck-bill valve is shown in US. Pat. No. 3,159,176.
- a second vacuum source port 36 is disposed in the side wall l6 at a distance spaced from the end. wall 18.
- the port comprises the tube section which covers the port opening in the side wall.
- the actuating element or stud 38 Mounted centrally of the diaphragm 22 is the actuating element or stud 38.
- the stud is in the fonn of a headed element which extends through the actuating arm 40 of the, motor, is secured in acentral opening in the diaphragm, and extends toward the duck-bill valve 34 and is aligned therewith.
- the stud 38 is shown in tubular form and has adjacent the diaphragm a radial opening 42.
- the diaphragm of the embodiment shown may be made to assume any one of three positions.
- the diaphragm is shown in its rightward position where vacuum is not connected to either of the ports 32 or 36.
- vacuum is applied to port 36 only, the roll-type diaphragm moving leftward against the force of spring 26 to a position where it substantially occludes the port opening. This limits the travel of the diaphragm because if the diaphragm moves farther leftward port 36 is completely blocked.
- the stud 38 may take the form of a solid element 38 as shown in section in FIG. 7. Such an element which may be square or round in cross section will hold the lips 34a open to permit communication as long as the diaphragm is in the extreme leftward position shown.
- the diaphragm may be made to reassume the position in FIG. -4 by simply venting the line 32. This immediately causes the rightward movement of the diaphragm and stud 38 as atmospheric pressure enters the diaphragm chamber. With the stud 38 withdrawn from the lips 34a, (FIG. 4)lips 34a close and vacuum is restored within the diaphragm chamber as port 36 becomes unblocked by the roll-type diaphragm. Because the venting of the diaphragm chamber is controlled so that venting is cut off when the stud withdraws from the lips 34a, there is no overshooting by the diaphragm of the position shown in FIG. 4. This is a desirable characteristic and distinguishes from the motors of the prior art.
- the length of the stud element 38 be such that in the rightward movement of the diaphragm the stud will have just withdrawn from the lips 34a permitting them to close as the port 36 opening becomes exposed permitting restoration of vacuum in the diaphragm chamber.
- Valve means by which vacuum is applied to the ports 32 and 36 to effect the desired control of the motor of the invention may be contrived by one skilled in the art.
- the example shown is in the form of a rotary valve 12.
- the housing 50 of the valve encloses a rotatable core 52 and appropriately mounts in its side wallthe vacuum source conduit 54, a conduit 56 communicating with the port 36, and a conduit 58 communicating with port 32.
- the core 52 is formed with a short circumferential channel 60 enclosed at either side (FIG. 2), and a circumferential channel 62 open at one side to permit venting.
- the vacuum conduit 54 is blocked off by channel 60 and the conduits 56 and 58 are vented.
- the next position will have the vacuum conduit 54 communicating through channel 60 with conduit 56 and port 36.
- the conduit 58 connecting port 32 will still be vented to the atmosphere through channel 62. This will cause the diaphragm to assume the position shown in FIG. 4 since the duck-bill valve 34 seals off the diaphragm chamber.
- conduit 54 then communicates only through conduit 56 to port 36, conduit 58 being vented. This causes the diaphragm to immediately and directly reassume the position shown in FIG. 4 since conduit 58 is vented through channel 62 until the stud 38 withdraws from the valve 34 permitting the lips 34a to close and vacuum is restored through port 36. Because of this operation which characterizes the invention, there is no sloppy undertravel or overshooting as the diaphragm returns from the extreme position in FIG. 5 to the intermediate position of FIG. 4. Such undertravel or overshooting had characterized prior devices in which the venting of the port 32 was accomplished by a remote venting valve.
- FIGS. 8 and 9 An improved motor embodying the invention is shown in FIGS. 8 and 9.
- the primed form of the reference numerals used in FIGS. 1-7 are used to designate corresponding parts in the modified structure. While the form of the invention described above represents a marked improvement over prior devices, the FIGS. 8 and 9 embodiment provides even more reliable operation and is particularly useful where the environment is marked by severe temperature changes which might cause stretching or shrinking of the rubber diaphragm.
- the operation of the FIGS. 8 and 9 embodiment is basically similar to that of the above-described structure, however, small differences in structure provide greater reliability.
- the actuating element or stud 38' has its attached end 80 slideably fitting into a recess 82 in the diaphragm mounting boss or stem 84.
- the recess 82 is longer than the enlarged end 80 of the stud so as to provide a lost-motion relation between the stud and the stem.
- a restriction 86 is formed in the diaphragm end of the recess to provide a stop for the lost-motion travel just as the end of the recess provides a stop in the other direction.
- the distance from the diaphragm 22' to the distal end of the stud is shorter as the diaphragm moves toward the end wall 18' than when it moves away. This is because the frictional engagement of the stud or probe with the valve 34' will cause the stud to move through its lost motion with respect to the stem 84. This means that as the diaphragm retreats from the extreme position to the intermediate position (as shown in FIG. 8), the added length of the probe will cause the diaphragm to move past the intermediate position toward the partial end wall 20' (to the position shown in phantom in FIG. 9) until the probe is completely out of the valve 34' to permit it to close.
- the port 36' will then be either partially or completely uncovered and will cause the diaphragm to reverse its travel and move leftward toward the wall 18, the probe telescoping through its lost motion, until the diaphragm reaches its true intermediate position as is shown in FIG. 9.
- the edge of the diaphragm bears the relation to the port 36 as was described in connection with FIG. 1.
- This relationship holds with the structure of the FIG. 8,9 modifications irrespective of the amount of diaphragm stretching that has taken place, because in its last portion of movement the diaphragm is drawn back in a leftward direction to the true intermediate position by the vacuum of the port 36.
- FIG. 89 modifications irrespective of the amount of diaphragm stretching that has taken place, because in its last portion of movement the diaphragm is drawn back in a leftward direction to the true intermediate position by the vacuum of the port 36.
- the diaphragm will stop when the probe withdraws from the duck-bill 34 at which time the diaphragm, if it is elongated or stretched, for instance, could extend leftwardly well past the port 36 and completely seal it so that the subsequent venting of port 36 would not vent the chamber and the diaphragm would not immediately revert to the FIG. 1 or relaxed position.
- the flow area through port 36' be smaller than the flow area through the valve 34' in order to make certain that the rate of air withdrawn from the diaphragm chamber through port 36' will be less than the rate of air entering through valve 34'. This assures that the diaphragm will go beyond the intermediate position to the point at which the probe completely withdraws from the valve and permits it to close, enabling the vacuum drawn through port 36' to draw the diaphragm to a stable intermediate position. If the opposite were true, or if the flows were equal during the overtravel, the diaphragm would come to rest or oscillate in a position at which air would simply flow through the chamber with both the valve 34 and the port 36 open.
- FIG. 8 and FIG. 9 versions incorporate the additional feature which is the stabilizing lip in the end wall 20'.
- This lip 90 steadies the boss 84 to avoid cocking of the diaphragm which might otherwise cause the probe 38 to approach valve 34 ofi' center so as to damage it.
- the actuating arm 40' is connected to the boss 84 in a connection which allows for some play as shown.
- the end of arm 40 is apertured and receives a neck adjacent the headed end 84a of the boss.
- a diaphragm-type vacuum motor having a housing, an end wall and a side wall in the housing, an end wall vacuum port in the housing, an outwardly directed duck-bill valve closing the port, a diaphragm in the housing, spring means urging the diaphragm away from the end wall, a stud carried by the diaphragm adapted to extend into and hold open the duck-bill as the port is vented until the diaphragm retreats from proximate the end wall to a locus intermediate the ends of its travel, and means adapted to selectively connect the port to a vacuum source or to atmosphere.
- a multiple-position vacuum motor comprising a. a housing having an end wall and a continuous side wall;
- a movable element cooperating with the housing to form a chamber and adapted to assume at least two positions
- f. means to connect the port selectively to a vacuum source or the atmosphere.
- a multi-position vacuum motor as described in claim 6 wherein the stud is mounted on the movable element with a lost-motion connection so that the side wall port is assuredly uncovered as the movable element moves past the second position before the duck-bill is allowed to close and then the vacuum may be applied through the port in the side wall so that the movable element is moved back to the second position.
- a motor as described in claim 4 wherein the stud is tubular and open at its distal end and has an opening in its side in the motor and proximate the movable element.
- a motor as described in claim 4 wherein the means to connect is a rotary valve.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Fluid-Driven Valves (AREA)
- Details Of Valves (AREA)
Abstract
Description
Claims (11)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US4219570A | 1970-06-01 | 1970-06-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3657966A true US3657966A (en) | 1972-04-25 |
Family
ID=21920566
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US42195A Expired - Lifetime US3657966A (en) | 1970-06-01 | 1970-06-01 | Multi-position vacuum motor |
Country Status (1)
Country | Link |
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US (1) | US3657966A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4083290A (en) * | 1975-03-20 | 1978-04-11 | Daimler-Benz Aktiengesellschaft | Pneumatic adjusting mechanism |
US4111099A (en) * | 1977-04-08 | 1978-09-05 | General Motors Corporation | Two-stage vacuum motor |
US4346729A (en) * | 1979-05-29 | 1982-08-31 | Eaton Corporation | Temperature control system and pushbutton controlled pneumatic actuator |
US4364301A (en) * | 1979-09-21 | 1982-12-21 | Aisin Seiki Kabushiki Kaisha | Vacuum actuator |
US5524526A (en) * | 1994-10-28 | 1996-06-11 | Ford Motor Company | Vacuum motor for an automotive vehicle |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2782025A (en) * | 1955-04-07 | 1957-02-19 | Gen Motors Corp | Throttle valve control mechanism |
US2990849A (en) * | 1956-02-01 | 1961-07-04 | Renault | Non-return valve |
US3072108A (en) * | 1961-10-02 | 1963-01-08 | Bendix Corp | Multi-position vacuum motor |
US3334545A (en) * | 1965-03-10 | 1967-08-08 | Robertshaw Controls Co | Multiple position vacuum actuator |
US3381582A (en) * | 1966-06-24 | 1968-05-07 | Robertshaw Controls Co | Fluidic operated multiposition actuator or the like |
US3405607A (en) * | 1966-06-08 | 1968-10-15 | Robertshaw Controls Co | Multi-position fluidic controlled actuator |
-
1970
- 1970-06-01 US US42195A patent/US3657966A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2782025A (en) * | 1955-04-07 | 1957-02-19 | Gen Motors Corp | Throttle valve control mechanism |
US2990849A (en) * | 1956-02-01 | 1961-07-04 | Renault | Non-return valve |
US3072108A (en) * | 1961-10-02 | 1963-01-08 | Bendix Corp | Multi-position vacuum motor |
US3334545A (en) * | 1965-03-10 | 1967-08-08 | Robertshaw Controls Co | Multiple position vacuum actuator |
US3405607A (en) * | 1966-06-08 | 1968-10-15 | Robertshaw Controls Co | Multi-position fluidic controlled actuator |
US3381582A (en) * | 1966-06-24 | 1968-05-07 | Robertshaw Controls Co | Fluidic operated multiposition actuator or the like |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4083290A (en) * | 1975-03-20 | 1978-04-11 | Daimler-Benz Aktiengesellschaft | Pneumatic adjusting mechanism |
US4111099A (en) * | 1977-04-08 | 1978-09-05 | General Motors Corporation | Two-stage vacuum motor |
US4346729A (en) * | 1979-05-29 | 1982-08-31 | Eaton Corporation | Temperature control system and pushbutton controlled pneumatic actuator |
US4364301A (en) * | 1979-09-21 | 1982-12-21 | Aisin Seiki Kabushiki Kaisha | Vacuum actuator |
US5524526A (en) * | 1994-10-28 | 1996-06-11 | Ford Motor Company | Vacuum motor for an automotive vehicle |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CONNECTICUT NATIONAL BANK, THE,CONNECTICUT Free format text: SECURITY INTEREST;ASSIGNOR:ROSTRA ENGINEERED COMPONENTS, INC., A CT CORP.;REEL/FRAME:004770/0627 Effective date: 19870929 Owner name: CONNECTICUT NATIONAL BANK, THE, 777 MAIN STREET, H Free format text: SECURITY INTEREST;ASSIGNOR:ROSTRA ENGINEERED COMPONENTS, INC., A CT CORP.;REEL/FRAME:004770/0627 Effective date: 19870929 |
|
AS | Assignment |
Owner name: ROSTRA ENGINEERED COMPONENTS, INC., A CORP. OF CT. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CENTURY BRASS PRODUCTS, INC., A CORP. OF CT.;REEL/FRAME:004821/0607 Effective date: 19870930 Owner name: ROSTRA ENGINEERED COMPONENTS, INC., 191 POST ROAD Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CENTURY BRASS PRODUCTS, INC., A CORP. OF CT.;REEL/FRAME:004821/0607 Effective date: 19870930 |
|
AS | Assignment |
Owner name: ROSTRA ENGINEERED COMPONENTS, INC., Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CONNECTICUT NATIONAL BANK, THE,;REEL/FRAME:005416/0540 Effective date: 19900731 |