CA1193303A - Drive means for a timing mechanism - Google Patents
Drive means for a timing mechanismInfo
- Publication number
- CA1193303A CA1193303A CA000420210A CA420210A CA1193303A CA 1193303 A CA1193303 A CA 1193303A CA 000420210 A CA000420210 A CA 000420210A CA 420210 A CA420210 A CA 420210A CA 1193303 A CA1193303 A CA 1193303A
- Authority
- CA
- Canada
- Prior art keywords
- ratchet teeth
- major diameter
- teeth
- rotatable
- ratchet
- 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
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Abstract
DRIVE MEANS FOR A TIMING MECHANISM
ABSTRACT OF THE DISCLOSURE
Rotation of a cam means of a timing mechanism is provided by three sets of axially aligned ratchet teeth having different major and minor diameters and a drive pawl selectively engaging the three sets of teeth.
The arrangement provides a means to delay the actuation of switches which control the functions of an appliance.
In one embodiment, the relationship between the three sets of ratchet teeth allows a variable range of interval times in a single timer program. That is, the arrangement provides variable dwell times versus cam advance times.
ABSTRACT OF THE DISCLOSURE
Rotation of a cam means of a timing mechanism is provided by three sets of axially aligned ratchet teeth having different major and minor diameters and a drive pawl selectively engaging the three sets of teeth.
The arrangement provides a means to delay the actuation of switches which control the functions of an appliance.
In one embodiment, the relationship between the three sets of ratchet teeth allows a variable range of interval times in a single timer program. That is, the arrangement provides variable dwell times versus cam advance times.
Description
3~
BAC~ ROIll~ OF ~IE IMVE~TIO~
Generally speaking, the present invention pertains to a drive means of a timing mechan~sm which comprises ~irst ratchet teeth of a first major d;ameter coupled to a cam means; second ratchet teeth of a second major diameter in working relationship with the first ratchet teeth, third ratchet teeth of a third major diameter in working relation with the first and second ratchet teeth; and a drive pawl selectively engaging two of the first, second and third ratchet teeth at a first predetermined period of time to inter~ittently rotate the same, and a single one of said first, second and third ratchet teeth to intermittently rotate same.
LO The present invention relates to a timing mechanism and, more particularly, to a timing mechanism having a means to delay the operational program of the timing mechanism and to provide variable interval time per;ods so as ta provide variable dwell (delay) times versus cam advance times.
Timing mechanisms have been used in the appliance industry for many years to control the sequential operation of an appliance such as a washer, dryer, dishwasher and of recent years, microwave ovens.
In such applications~ it has sometimes been found necessary to apply electrical power to the ~iming mechanism while at the same time delay the initiation of the program provided by the timing mechanism until a desired starting time. In addition, depending on the desired programs, it i5 also highly desirable to provide variable interval or delay times between advance times. For the most part, the mechanisms used to provide such delay have been c~mplicated, difficult to fabricate, and costly to produce.
FEATURES OR OBJECTS OF THE INVENTION
It is, there~ore9 a feature of the present invention to provide ~33~
a timing mPcha3l;snl having a means to delay initiation of the program provided by the timing mechanismO Qnother feature of the invention is to provide a means -to provide variable interval or delay times between advance times. Another feature of the invention is to provide a timing mechanisln wherein such means is simple and easy to produce. Another ~eature of the invention is to provide such a timing mechanism which utilizes cooperating sets of ratchet teeth of different major diameters.
Still another ~eature of the invention is to provide such a timing mechanism wherein a single drive pawl selectively engages two of the three sets of ratchet teeth during a first predetermined period of time and a single one of the first, second and third ratchet teeth during a second predetermined period oF time. These and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
Figure l is an exploded view of a tlming mechanism employing the features of the invention.
Figure 2 is a view of a typical ratchet illustrating major and minor diameters.
Figures 3-5 are similar views illus~rating three modes of operation of the drive means of the present invention.
Figllre 6 i5 a view of alternate ratchet teeth.
Figures 7A through 7C are plan views showing the relationship between the alte~nate ratchet teeth and the drive pawls of the timing mechanism.
DETAILED DESCRIPTION OF THE DRAWINGS
Referring now to Figure 1, there is shown a timing mechanism lO
which, ;n general, includes a cam means 12 which upon rotation selectively opens and closes electrical switch means 14 that engages the cam
BAC~ ROIll~ OF ~IE IMVE~TIO~
Generally speaking, the present invention pertains to a drive means of a timing mechan~sm which comprises ~irst ratchet teeth of a first major d;ameter coupled to a cam means; second ratchet teeth of a second major diameter in working relationship with the first ratchet teeth, third ratchet teeth of a third major diameter in working relation with the first and second ratchet teeth; and a drive pawl selectively engaging two of the first, second and third ratchet teeth at a first predetermined period of time to inter~ittently rotate the same, and a single one of said first, second and third ratchet teeth to intermittently rotate same.
LO The present invention relates to a timing mechanism and, more particularly, to a timing mechanism having a means to delay the operational program of the timing mechanism and to provide variable interval time per;ods so as ta provide variable dwell (delay) times versus cam advance times.
Timing mechanisms have been used in the appliance industry for many years to control the sequential operation of an appliance such as a washer, dryer, dishwasher and of recent years, microwave ovens.
In such applications~ it has sometimes been found necessary to apply electrical power to the ~iming mechanism while at the same time delay the initiation of the program provided by the timing mechanism until a desired starting time. In addition, depending on the desired programs, it i5 also highly desirable to provide variable interval or delay times between advance times. For the most part, the mechanisms used to provide such delay have been c~mplicated, difficult to fabricate, and costly to produce.
FEATURES OR OBJECTS OF THE INVENTION
It is, there~ore9 a feature of the present invention to provide ~33~
a timing mPcha3l;snl having a means to delay initiation of the program provided by the timing mechanismO Qnother feature of the invention is to provide a means -to provide variable interval or delay times between advance times. Another feature of the invention is to provide a timing mechanisln wherein such means is simple and easy to produce. Another ~eature of the invention is to provide such a timing mechanism which utilizes cooperating sets of ratchet teeth of different major diameters.
Still another ~eature of the invention is to provide such a timing mechanism wherein a single drive pawl selectively engages two of the three sets of ratchet teeth during a first predetermined period of time and a single one of the first, second and third ratchet teeth during a second predetermined period oF time. These and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
Figure l is an exploded view of a tlming mechanism employing the features of the invention.
Figure 2 is a view of a typical ratchet illustrating major and minor diameters.
Figures 3-5 are similar views illus~rating three modes of operation of the drive means of the present invention.
Figllre 6 i5 a view of alternate ratchet teeth.
Figures 7A through 7C are plan views showing the relationship between the alte~nate ratchet teeth and the drive pawls of the timing mechanism.
DETAILED DESCRIPTION OF THE DRAWINGS
Referring now to Figure 1, there is shown a timing mechanism lO
which, ;n general, includes a cam means 12 which upon rotation selectively opens and closes electrical switch means 14 that engages the cam
-2-331~
means, and a motor drive means 16 which applies power driven rotation to the cam means 12 through drive means 18. Cam means 12 includes a plurality of cams 12' having coded indicia 13 thereon and that are intecgrally formed on a hub portion 20 and a shaft 22, shaft 22 being rotatably journalled in base plate 24 through aperture 26. Motor drive means 16 is carried on a plate 28 which is secured to base plate 24.
Motor drive means 16 may be of any suitable type known in the industry such as a synchr~nous motor.
Drive means 18 includes a motor output pinion 30 which extends through plate 28 and engages a drive gear 32, the drive gear 32 having a major axis defined by hub and shaft 36 which is rotatably journalled in base plate 24 through aperture 34. Gear 32 also includes an eccentric 38 which is slightly off center of the major axis. A drive pawl 40 and a stop pawl or a secondary drive pawl 42 are carried by eccentric 38 to be rotated in accôrdance with the movement of the eccentric. The portion of the drive means 18 described thus far, as well as the other elements of the timing mechanism previously clescribed, are well known in the art and form no part of the present invenion.
The present invention is concerned with the drive portion 18' of drive means 18 ~Jhich provides a means to delay the operation of electrical switch means 14 even though electric power has been applied to the device, Drive means 1~' includes first ratchet teeth 44 which are integral with cam means 12, second ratchet teeth 46 which are also integral with cam means 12, and third ratchet teeth 48 which i5 independently ~otatably earried on shaft 22. Each of the ratchet teeth has a major and minor diameter. For the purposes of the present invention the meaning of the terms major and minor diameters are illustrated in Figure 2. Referring to Figure 2, a major diameter B is the distance to the outermost point of the teeth while a minor ciiameter A is a distance to the base of the teeth. Ratchet teeth 46
means, and a motor drive means 16 which applies power driven rotation to the cam means 12 through drive means 18. Cam means 12 includes a plurality of cams 12' having coded indicia 13 thereon and that are intecgrally formed on a hub portion 20 and a shaft 22, shaft 22 being rotatably journalled in base plate 24 through aperture 26. Motor drive means 16 is carried on a plate 28 which is secured to base plate 24.
Motor drive means 16 may be of any suitable type known in the industry such as a synchr~nous motor.
Drive means 18 includes a motor output pinion 30 which extends through plate 28 and engages a drive gear 32, the drive gear 32 having a major axis defined by hub and shaft 36 which is rotatably journalled in base plate 24 through aperture 34. Gear 32 also includes an eccentric 38 which is slightly off center of the major axis. A drive pawl 40 and a stop pawl or a secondary drive pawl 42 are carried by eccentric 38 to be rotated in accôrdance with the movement of the eccentric. The portion of the drive means 18 described thus far, as well as the other elements of the timing mechanism previously clescribed, are well known in the art and form no part of the present invenion.
The present invention is concerned with the drive portion 18' of drive means 18 ~Jhich provides a means to delay the operation of electrical switch means 14 even though electric power has been applied to the device, Drive means 1~' includes first ratchet teeth 44 which are integral with cam means 12, second ratchet teeth 46 which are also integral with cam means 12, and third ratchet teeth 48 which i5 independently ~otatably earried on shaft 22. Each of the ratchet teeth has a major and minor diameter. For the purposes of the present invention the meaning of the terms major and minor diameters are illustrated in Figure 2. Referring to Figure 2, a major diameter B is the distance to the outermost point of the teeth while a minor ciiameter A is a distance to the base of the teeth. Ratchet teeth 46
3-3;3~3 has a major diameter B which is less than the major diameter of ratchet teeth 44 and a minor diameter A which is also less than the minor diameter of teeth 44. For the sake of c.larity, ratchet teeth 48 are not shown in Figure 29 bu~ they have a major diameter which is less than the major diameter of ratchet teeth 44 but greater than the major diameter o~ ratchet teeth 46. Such teeth relationship is shown with reference to Figures 3-5.
Returning to Figure 1~ and as will be hereinafter explained, drive pawl 40 selectively engages ratchet teeth 48 and ratchet teeth 46 during a predetermined period of time and further engages only ratchet teeth 44 during another period of time. Ratchet 48 includes a notch 50 that is of sufficient depth to provide a minor diameter at least as small as the minor diameter of ratchet teeth 46. Stop pawl or secondary drive pawl 42 engages ratchet teeth 44 to prevent backlash oF cam means 12 during its intermittent rotation while slider 52, which is slidably carried in slot 54 of base member 24, engages ratchet teeth 48 to prevent ;ts backlash. Pawls 40 and 42 are spring biased through coil springs 40' and 42' to insure engagement oF the pawls with ratchet teeth 44 while slider 52 is spring biased through spring 52' (which engages another fralne member of the timing mechanism, not shown) to insure engagement of the slider with ratchet teeth 48 all in a manner well known in the art.
The number of teeth of ratchet teeth 46 corresponds to the amount of delay time desired. For example, each tooth cou1d represent an hour. The location of the teeth and cam means 12 with respect to a 2ero start time as to the number of delay hours desired can then be manually set by manually rotating an extension of shaft 22 (not shown) through a clutch in a manner well known in the art.
The operation of drive means 18' can now be described with reference to Figures 3-5~ it be;ng understood that drive pawl 40 and stop pawl 42 are operated through motor drive means 16 and eccentric 38. In Figure 3, drive pawl 40 is engaging the teeth of ratchet 48 only to drive it alone. Both ratchets 46 and 44 are stationary.
In Figure 4, drive pawl 40 has engaged slot 50 of ratchet 48.
Since, as noted previously3 the depth of knotch 50 is of sufficient depth to provide a minor diameter at least as small as the minor diameter of ratchet 46, drive pawl 40 will also engage ratchet 46.
Since, in the present embodiment, both ratchet teeth 44 and 46 are integral with cam means 12, the cam means will advance one step in accordance with the teeth of ratchet teeth 46. However, it should be understood that during this time, cam means 12 will not be in a position to activate any of the switches of electrical switch means l4. More specifically, and as previously noted, the number of teeth in ratchet teeth 46 corresponds to the delay time. Therefore, a portion l5 (Figure l) of the perimeter of cam means 12 that is in line with and approximtely e~ual to the arc length of ratchet teeth 46 will be free of coded indicia l3 which control functions of the appliance so that corresponding switches of switch means l4 cannot be activated.
In Figure 5, drive pawl 40 has passed through ratchet teeth 46 and now engages ratchet teeth 44 for continued intermittent rotation of cam means 12 to start the normal program of the timing mechanism and activate electrical switch means l4.
Referring now to Figures 6 and 7A through 7C, another embodiment of the invention can now be described. This embodiment allows a variab1e range of time ;ntervals in a single given timer program.
Prior art interval timers have -fixed interval periods throughout their respect;ve cycles. The variable range of time intervals is accomplished primarily by providing ratchet teeth 44'3 46' and 48' in place of the previously described ratchets 44, 46 and 48. As in the case of the embodiment of Figures l- 5, ratchet teeth 44' and 46' are -~ ~1 ~'2~3,rS~
integral with cam means 12, while ratchet teeth 48' are independently rotatably carried on shaft 22.
Ratchet teeth 44' are the same as ~hose of ratchet teeth 44 of the embodiment of Figures 1-5. Ratchet teeth 46' have a major diameter E which is less than the- major diameter F of ratchet teeth 44' while teeth 102 have the same major d;ameter as teeth 44' and are integral therewith.
Ratchet teeth 48' has a major diameter which is the same as major diameter F of teeth 102 and 44'. As shown, there is a plurality of notches 50' which have a minor diameter G which is at least as small as a minor diameter of ratchet 46'.
It is to be understood that the number of teeth in any one ratchet and the spacing between the teeth is dependent upon the particular program including the amount of interval time desired.
Referring now to Figures 7A-7C, the operation of the present embodiment may be described. In Figure 7A, main drive pawl 40 is in engagement with both ratchet teeth 102 and 104 while secondary drive pawl 42 ensages teeth 102. Thus both cam means 12 and ratchet teeth 48' are incremently moved. In Figure 7B main drive pawl 40 is engaging ratchet teeth 104 only while secondary drive pawl 42 engages teeth 102. In this mode, cam means 12 ;s substantially stationary since there is only a slight movement oF secondary drive pawl 42. In Figure 7C drive pawl 40 has engaged one of the notches 50' of ratchet 48' to engage teeth 46' while secondary drive pawl 42 continues to engage teeth 102. In this mode, cam means 12 advances for one interval of no~ch 50'.
There is thus provided in the embodiment of Figures 6 through 7C
a means of varying the time between advances of cam means 12, the time intervals being programmed by selection of the spacing of notches 50', major diameter ratchet teeth spacing and intervals between the strokes of pawls 40 and 42.
-6^
Returning to Figure 1~ and as will be hereinafter explained, drive pawl 40 selectively engages ratchet teeth 48 and ratchet teeth 46 during a predetermined period of time and further engages only ratchet teeth 44 during another period of time. Ratchet 48 includes a notch 50 that is of sufficient depth to provide a minor diameter at least as small as the minor diameter of ratchet teeth 46. Stop pawl or secondary drive pawl 42 engages ratchet teeth 44 to prevent backlash oF cam means 12 during its intermittent rotation while slider 52, which is slidably carried in slot 54 of base member 24, engages ratchet teeth 48 to prevent ;ts backlash. Pawls 40 and 42 are spring biased through coil springs 40' and 42' to insure engagement oF the pawls with ratchet teeth 44 while slider 52 is spring biased through spring 52' (which engages another fralne member of the timing mechanism, not shown) to insure engagement of the slider with ratchet teeth 48 all in a manner well known in the art.
The number of teeth of ratchet teeth 46 corresponds to the amount of delay time desired. For example, each tooth cou1d represent an hour. The location of the teeth and cam means 12 with respect to a 2ero start time as to the number of delay hours desired can then be manually set by manually rotating an extension of shaft 22 (not shown) through a clutch in a manner well known in the art.
The operation of drive means 18' can now be described with reference to Figures 3-5~ it be;ng understood that drive pawl 40 and stop pawl 42 are operated through motor drive means 16 and eccentric 38. In Figure 3, drive pawl 40 is engaging the teeth of ratchet 48 only to drive it alone. Both ratchets 46 and 44 are stationary.
In Figure 4, drive pawl 40 has engaged slot 50 of ratchet 48.
Since, as noted previously3 the depth of knotch 50 is of sufficient depth to provide a minor diameter at least as small as the minor diameter of ratchet 46, drive pawl 40 will also engage ratchet 46.
Since, in the present embodiment, both ratchet teeth 44 and 46 are integral with cam means 12, the cam means will advance one step in accordance with the teeth of ratchet teeth 46. However, it should be understood that during this time, cam means 12 will not be in a position to activate any of the switches of electrical switch means l4. More specifically, and as previously noted, the number of teeth in ratchet teeth 46 corresponds to the delay time. Therefore, a portion l5 (Figure l) of the perimeter of cam means 12 that is in line with and approximtely e~ual to the arc length of ratchet teeth 46 will be free of coded indicia l3 which control functions of the appliance so that corresponding switches of switch means l4 cannot be activated.
In Figure 5, drive pawl 40 has passed through ratchet teeth 46 and now engages ratchet teeth 44 for continued intermittent rotation of cam means 12 to start the normal program of the timing mechanism and activate electrical switch means l4.
Referring now to Figures 6 and 7A through 7C, another embodiment of the invention can now be described. This embodiment allows a variab1e range of time ;ntervals in a single given timer program.
Prior art interval timers have -fixed interval periods throughout their respect;ve cycles. The variable range of time intervals is accomplished primarily by providing ratchet teeth 44'3 46' and 48' in place of the previously described ratchets 44, 46 and 48. As in the case of the embodiment of Figures l- 5, ratchet teeth 44' and 46' are -~ ~1 ~'2~3,rS~
integral with cam means 12, while ratchet teeth 48' are independently rotatably carried on shaft 22.
Ratchet teeth 44' are the same as ~hose of ratchet teeth 44 of the embodiment of Figures 1-5. Ratchet teeth 46' have a major diameter E which is less than the- major diameter F of ratchet teeth 44' while teeth 102 have the same major d;ameter as teeth 44' and are integral therewith.
Ratchet teeth 48' has a major diameter which is the same as major diameter F of teeth 102 and 44'. As shown, there is a plurality of notches 50' which have a minor diameter G which is at least as small as a minor diameter of ratchet 46'.
It is to be understood that the number of teeth in any one ratchet and the spacing between the teeth is dependent upon the particular program including the amount of interval time desired.
Referring now to Figures 7A-7C, the operation of the present embodiment may be described. In Figure 7A, main drive pawl 40 is in engagement with both ratchet teeth 102 and 104 while secondary drive pawl 42 ensages teeth 102. Thus both cam means 12 and ratchet teeth 48' are incremently moved. In Figure 7B main drive pawl 40 is engaging ratchet teeth 104 only while secondary drive pawl 42 engages teeth 102. In this mode, cam means 12 ;s substantially stationary since there is only a slight movement oF secondary drive pawl 42. In Figure 7C drive pawl 40 has engaged one of the notches 50' of ratchet 48' to engage teeth 46' while secondary drive pawl 42 continues to engage teeth 102. In this mode, cam means 12 advances for one interval of no~ch 50'.
There is thus provided in the embodiment of Figures 6 through 7C
a means of varying the time between advances of cam means 12, the time intervals being programmed by selection of the spacing of notches 50', major diameter ratchet teeth spacing and intervals between the strokes of pawls 40 and 42.
-6^
Claims (4)
1. A timing mechanism comprising a) a cam means rotatably carried on a shaft and providing a program and electrical switches opening and closing in response to said program, b) rotatable first ratchet teeth of a first major diameter carried on said shaft and coupled to said cam means for intermittent rotation therewith, c) groups of rotatable second ratchet teeth coupled to and in axial alignment with said first rotatable ratchet teeth and of a second major diameter which is less than said first major diameter, d) rotatable third ratchet teeth carried by said shaft in axial alignment with said first and second ratchet teeth and independently rotatable from said first and second ratchet teeth and having a third major diameter which is greater than said second major diameter and further having a plurality of notches of sufficient depth to provide a minor diameter at least as small as a minor diameter of said second ratchet teeth, e) a drive pawl selectively engaging said first and third rotatable ratchet teeth and said second ratchet teeth when engaged with said notches, and f) individual stop means engaging said first and third ratchet teeth.
Z, A timing mechanism according to claim 1 wherein said group of rotatable second ratchet teeth are separated by teeth integral with and of the same major diameter as said first ratchet teeth.
3 A method of delaying actuation of electrical switches which control functions of an appliance and that are responsive to a rotation of a cam means comprising:
a) providing first ratchet teeth of a first major diameter coupled to said cam means, b) providing groups of second ratchet teeth of a second lesser major diameter than said first major diameter in working relation to said first ratchet teeth, the number of teeth being proportional to a desired time of said delayed actuation, c) providing a third set of ratchet teeth of a third major diameter that is greater than said second major diameter and further including a plurality of notches having a minor diameter which is at least less than a minor diameter of said second ratchet teeth, and d) providing a drive means driving said cam means and including a drive pawl selectively engaging said first and third ratchet teeth and said second ratchet teeth when engaged with said notches.
a) providing first ratchet teeth of a first major diameter coupled to said cam means, b) providing groups of second ratchet teeth of a second lesser major diameter than said first major diameter in working relation to said first ratchet teeth, the number of teeth being proportional to a desired time of said delayed actuation, c) providing a third set of ratchet teeth of a third major diameter that is greater than said second major diameter and further including a plurality of notches having a minor diameter which is at least less than a minor diameter of said second ratchet teeth, and d) providing a drive means driving said cam means and including a drive pawl selectively engaging said first and third ratchet teeth and said second ratchet teeth when engaged with said notches.
4. A timing mechanism according to claim 3 wherein said groups of second ratchet teeth are separated by teeth integral with and of the same major diameter as said first ratchet teeth.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/398,403 | 1982-07-14 | ||
| US06/398,403 US4442326A (en) | 1980-11-07 | 1982-07-14 | Drive means for a timing mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1193303A true CA1193303A (en) | 1985-09-10 |
Family
ID=23575263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000420210A Expired CA1193303A (en) | 1982-07-14 | 1983-01-25 | Drive means for a timing mechanism |
Country Status (2)
| Country | Link |
|---|---|
| BR (1) | BR8300927A (en) |
| CA (1) | CA1193303A (en) |
-
1983
- 1983-01-25 CA CA000420210A patent/CA1193303A/en not_active Expired
- 1983-02-25 BR BR8300927A patent/BR8300927A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| BR8300927A (en) | 1984-04-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |