CA1136897A - Timer utilizing novel clutch - Google Patents
Timer utilizing novel clutchInfo
- Publication number
- CA1136897A CA1136897A CA000359954A CA359954A CA1136897A CA 1136897 A CA1136897 A CA 1136897A CA 000359954 A CA000359954 A CA 000359954A CA 359954 A CA359954 A CA 359954A CA 1136897 A CA1136897 A CA 1136897A
- Authority
- CA
- Canada
- Prior art keywords
- discs
- pair
- cam
- rotating member
- cam programming
- 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
Landscapes
- Measurement Of Predetermined Time Intervals (AREA)
Abstract
TIMER UTILIZING NOVEL CLUTCH
ABSTRACT OF DISCLOSURE
A clutch particularly adaptable to a timing mechanism comprising a metal member with an aperture in it and a plastic shaft extending through the aperture and having two plastic clutch discs engaging opposed faces of the metal member. Flanges extending from the clutch discs connect the discs to cam means of the timing mechanism.
ABSTRACT OF DISCLOSURE
A clutch particularly adaptable to a timing mechanism comprising a metal member with an aperture in it and a plastic shaft extending through the aperture and having two plastic clutch discs engaging opposed faces of the metal member. Flanges extending from the clutch discs connect the discs to cam means of the timing mechanism.
Description
113~
Generally speaking, the present inventlon relates to a timing mechanisnl having a clutch means permitting manual rotation of a cam means independent of a motor drive means, the clutch means comprising a rotating member fabricated of a material having a first coefficient oF
friction and an aperture therein and a shaft extending through the aperture and including discs of a materiai of a second material having a different coefficient of friction cooperating with the rotating member.
The present invention relates to timing mechanisms and more particularly to a timing mechanism which is neat and compact, and which utilizes a clutch means which through its individual compactness and neatness aids in maintaining the overall compactness of the timer.
Timing mechanisms are used in appliances such as washers, dryers, hair dryers, etc. to sequentially operate the appliance in accordance ~ith a programmed sequence. In such mechanisms, cam programming means including cams carried by a shaft actuate electrical switches to provide the program sequence. The cam program means are usually driven through a motor drive means which usually includes a speed reduction means such as a gear train. In some instances, the cam programming means can be manually rotated so that a desired starting point of the program can be manually set. In such instances, clutching means need to be provided so that the cam programming means can be rotated independent of the motor drive.
In applications such as for hair dryers, the timing mechanism needs to be neat and compact with as little protrusions extending from the body of the timers as possible.
OBJECTS OR FEATURES OF THE INVENTION
The present invention is concerned with timing mechanisms and has as one of its objects the provision of a timer which is neat and -30 compact.
rl ~ ~
~ nother object of the inventiol~ is the provision of a timer ~Jhicil utilizes a c'lutch means so that the cam programming means may be manually rotated independent of the timer motor drive means.
Still another object of the invention is the provision of a clutch means which includes a rotating member fabricated of a material having a first coefficient of friction and an aperture therein and a shaft extending through the aperture and having clutch discs fabricated of a second material having a different coefficient of friction.
These and other objects of the invention will become'apparent from the following description taken in conjunction with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
FIGURE 1 is an exploded view of a timing mechanism; and FIGURE 2 is an enlarged view showing the cooperating elements of a clutch means used in the timer.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to FIGURE 1, there is shown a timing device'10 incorporating the novel features-of the present invention. The timer is composed of two sub-assemblies, the motor assembly 11 and the switch timing mechanism 12. The motor assembly includes a synchronous motor 9 and an appropriate gear train 8 which includes an output pinion (not shown) which engages gear 7 to drive the switch timing mechansim 12 through shaft 13. Gear 7 is independently rotatably carried on shaft 13 through an aperture 13' in the gear. The housing or cover for the switch timin mechanism includes a cup shaped member 14 and a cover plate 15 adapted to close the same. Cover plate 15 is securely fastened to a base plate of the housing for the gear train assembly through a plurality of screws 16 which engage internally threaded posts 16' extending through oblong shaped apertures 17. The cup shaped member 14 and the cover plate 15 are preferably fabricated of an electrically insulating material such as a phenolic plastic, for example.
.. .. .. .. ..
113689q 'rhe essential parts of the switch timing mechanisn1, in general, comprise the switch contact blades 18 and 19 having electrical termin~ls 18' and 19' integrally formed as part or the blades, cam programming mealls 29, and contact blade retaining means 32 and 32' formed as an integral part of the cover 15, and cup shaped member 14. Cam programming means 29 includes at least one cam 29' rotatably carried about shaft 13.
Shaft 13 is journalled in the base of cup shaped member 14 and in cover plate 15. For illustrative purposes, there is shown a step 30 provided in the cam, the step being formed in size and contour according to the desired program. As will be hereinafter described, such programming means will, with the proper selection of'contact blades 18 and 19, and blade retaining means 32 and 32', allow various switching circuits to be readily obtained, the operation of such circuits being controlled by the timing of the cam programming means 29.
Contact blade 18 is responsive to the cam progamming means through the wedge shaped cam follower 33, the follower being formed as an integral part of the blade. Blade 18, being responsive to the cam programming means, is the actuator blade. Movement of the blade 18 causes electrical contact 34 to engage contact 35. Suitable materials for the contact include an electrically conductive material such as copper, for example.
As illustrated in FIGURE 1, the timing device'of the present invention is adapted to give a single pole, single throw switching circuit arrangement. Cam programming means 29 forces blade 18 to rise when the wedge shaped cam follower 33 rides up an'd over the discrete arcuate step 30 thus closing contacts 34 and 35. Because of the contact blade retain-ing means 32 and 32' the blades readily return to their original position when cam fol~wer 33 again reaches arcuate step 30. Blade retaining means 32 includes a stepped blade seating member 36 integrally formed with and extending from cover 15, notches 37 and 38 formed in cup shaped 113~97 membelA 14, and L-shaped seating mel~ er ~9 integrally formed with and extending from cup shaped member 1~. E~lade retaining means 32' includes an L-shaped seat melllber 40 and substantially rectangular shaped retailling melllber 41 both of which are integrally formed with and extend-iny from cover 15, and L-shaped seat 42 and notches 43, 44 and 45 formed in cup shaped member 14.
When the various components of the retaining means are placed in their proper relationship by placing cover 15 over the opening of cup shaped-member~14, and when contact blades are inserted in slots formed by the inter-relationship of the parts, the contact blades will be cantilevered at one end with their other ends being fee to bend in accordance with the actuation induced by cam programming means 29. When the arcuate step 30 of the cam programming means again reaches the carn follower 33, blade 18 will return to the position shown, with blade 19 being stopped at the step 36' of stepped support member 36, thus breaking the electrical contact between contacts 34 and 35. Contact blades 18 and 19 preferably include elongated apertures 18" and 19"
which extend beyond the bend of the blades so that the blades can be more easily deflected for a given thickness of blade.
Shaft 13 can be either motor driven or can be manaully rotated through a knob 31 so that a desired setting, such as the program starting point, may be manually set. In order that the manual rotation may be independent of the motor drive means, a clutch means 50 is provided.
Referring to FIGURE 1 and 2, clutch means 50 includes gear 7 and a pair of clutch discs 52 and 54. Extending from discs 54 is a pair of oppositely disposed flanges 56 and 58 which engage corresponding slots 60 and 62 provided in hub 64 of cam programming means 29 to couple the discs thereto.
As will become apparent hereinafter, the clutching action arises from the difference in coefficient of friction between gear 7 and discs .... i 1136~97 52 and 54. That is, there must be sufficient friction between the gear and the discs so that the discs will rotate in accordance with the rotation of the gear when power driven rotation is applied to the gear and yet permit the discs to be manually rotated independent of the gear. For the timer iust described, it has been Found that a difference of friction sufficient to require about 15 inch - oz of torque to override the gear is satisfactory. In the present embodiment, this has been achieved by fabricating gear 7 of steel and the discs of a thermoplastic acetal copolymer plastic, each with a relatively smooth finish. The discs are insert molded with the gear and as a single piece with shaft 13 and flanges 56 and 58. This assures tight fit between the gear and the discs.
In operation, when power driven rotation is applied to gear 7, the Friction between the gear and discs 52 and 54 will cause the discs and shaft 13 to rotate and cam 29' will be driven through flanges 56 and 58 engaging notches 60 and 62 of the cam. When it is desired to manually set the cam, shaft 13 is manually rotated to rotate the cam through flanges 56 and 58 engaging slots 60 and 62 while discs 52 and 54 overcome the friction between them and gear 7 to override the gear.
.
. .
Generally speaking, the present inventlon relates to a timing mechanisnl having a clutch means permitting manual rotation of a cam means independent of a motor drive means, the clutch means comprising a rotating member fabricated of a material having a first coefficient oF
friction and an aperture therein and a shaft extending through the aperture and including discs of a materiai of a second material having a different coefficient of friction cooperating with the rotating member.
The present invention relates to timing mechanisms and more particularly to a timing mechanism which is neat and compact, and which utilizes a clutch means which through its individual compactness and neatness aids in maintaining the overall compactness of the timer.
Timing mechanisms are used in appliances such as washers, dryers, hair dryers, etc. to sequentially operate the appliance in accordance ~ith a programmed sequence. In such mechanisms, cam programming means including cams carried by a shaft actuate electrical switches to provide the program sequence. The cam program means are usually driven through a motor drive means which usually includes a speed reduction means such as a gear train. In some instances, the cam programming means can be manually rotated so that a desired starting point of the program can be manually set. In such instances, clutching means need to be provided so that the cam programming means can be rotated independent of the motor drive.
In applications such as for hair dryers, the timing mechanism needs to be neat and compact with as little protrusions extending from the body of the timers as possible.
OBJECTS OR FEATURES OF THE INVENTION
The present invention is concerned with timing mechanisms and has as one of its objects the provision of a timer which is neat and -30 compact.
rl ~ ~
~ nother object of the inventiol~ is the provision of a timer ~Jhicil utilizes a c'lutch means so that the cam programming means may be manually rotated independent of the timer motor drive means.
Still another object of the invention is the provision of a clutch means which includes a rotating member fabricated of a material having a first coefficient of friction and an aperture therein and a shaft extending through the aperture and having clutch discs fabricated of a second material having a different coefficient of friction.
These and other objects of the invention will become'apparent from the following description taken in conjunction with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
FIGURE 1 is an exploded view of a timing mechanism; and FIGURE 2 is an enlarged view showing the cooperating elements of a clutch means used in the timer.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to FIGURE 1, there is shown a timing device'10 incorporating the novel features-of the present invention. The timer is composed of two sub-assemblies, the motor assembly 11 and the switch timing mechanism 12. The motor assembly includes a synchronous motor 9 and an appropriate gear train 8 which includes an output pinion (not shown) which engages gear 7 to drive the switch timing mechansim 12 through shaft 13. Gear 7 is independently rotatably carried on shaft 13 through an aperture 13' in the gear. The housing or cover for the switch timin mechanism includes a cup shaped member 14 and a cover plate 15 adapted to close the same. Cover plate 15 is securely fastened to a base plate of the housing for the gear train assembly through a plurality of screws 16 which engage internally threaded posts 16' extending through oblong shaped apertures 17. The cup shaped member 14 and the cover plate 15 are preferably fabricated of an electrically insulating material such as a phenolic plastic, for example.
.. .. .. .. ..
113689q 'rhe essential parts of the switch timing mechanisn1, in general, comprise the switch contact blades 18 and 19 having electrical termin~ls 18' and 19' integrally formed as part or the blades, cam programming mealls 29, and contact blade retaining means 32 and 32' formed as an integral part of the cover 15, and cup shaped member 14. Cam programming means 29 includes at least one cam 29' rotatably carried about shaft 13.
Shaft 13 is journalled in the base of cup shaped member 14 and in cover plate 15. For illustrative purposes, there is shown a step 30 provided in the cam, the step being formed in size and contour according to the desired program. As will be hereinafter described, such programming means will, with the proper selection of'contact blades 18 and 19, and blade retaining means 32 and 32', allow various switching circuits to be readily obtained, the operation of such circuits being controlled by the timing of the cam programming means 29.
Contact blade 18 is responsive to the cam progamming means through the wedge shaped cam follower 33, the follower being formed as an integral part of the blade. Blade 18, being responsive to the cam programming means, is the actuator blade. Movement of the blade 18 causes electrical contact 34 to engage contact 35. Suitable materials for the contact include an electrically conductive material such as copper, for example.
As illustrated in FIGURE 1, the timing device'of the present invention is adapted to give a single pole, single throw switching circuit arrangement. Cam programming means 29 forces blade 18 to rise when the wedge shaped cam follower 33 rides up an'd over the discrete arcuate step 30 thus closing contacts 34 and 35. Because of the contact blade retain-ing means 32 and 32' the blades readily return to their original position when cam fol~wer 33 again reaches arcuate step 30. Blade retaining means 32 includes a stepped blade seating member 36 integrally formed with and extending from cover 15, notches 37 and 38 formed in cup shaped 113~97 membelA 14, and L-shaped seating mel~ er ~9 integrally formed with and extending from cup shaped member 1~. E~lade retaining means 32' includes an L-shaped seat melllber 40 and substantially rectangular shaped retailling melllber 41 both of which are integrally formed with and extend-iny from cover 15, and L-shaped seat 42 and notches 43, 44 and 45 formed in cup shaped member 14.
When the various components of the retaining means are placed in their proper relationship by placing cover 15 over the opening of cup shaped-member~14, and when contact blades are inserted in slots formed by the inter-relationship of the parts, the contact blades will be cantilevered at one end with their other ends being fee to bend in accordance with the actuation induced by cam programming means 29. When the arcuate step 30 of the cam programming means again reaches the carn follower 33, blade 18 will return to the position shown, with blade 19 being stopped at the step 36' of stepped support member 36, thus breaking the electrical contact between contacts 34 and 35. Contact blades 18 and 19 preferably include elongated apertures 18" and 19"
which extend beyond the bend of the blades so that the blades can be more easily deflected for a given thickness of blade.
Shaft 13 can be either motor driven or can be manaully rotated through a knob 31 so that a desired setting, such as the program starting point, may be manually set. In order that the manual rotation may be independent of the motor drive means, a clutch means 50 is provided.
Referring to FIGURE 1 and 2, clutch means 50 includes gear 7 and a pair of clutch discs 52 and 54. Extending from discs 54 is a pair of oppositely disposed flanges 56 and 58 which engage corresponding slots 60 and 62 provided in hub 64 of cam programming means 29 to couple the discs thereto.
As will become apparent hereinafter, the clutching action arises from the difference in coefficient of friction between gear 7 and discs .... i 1136~97 52 and 54. That is, there must be sufficient friction between the gear and the discs so that the discs will rotate in accordance with the rotation of the gear when power driven rotation is applied to the gear and yet permit the discs to be manually rotated independent of the gear. For the timer iust described, it has been Found that a difference of friction sufficient to require about 15 inch - oz of torque to override the gear is satisfactory. In the present embodiment, this has been achieved by fabricating gear 7 of steel and the discs of a thermoplastic acetal copolymer plastic, each with a relatively smooth finish. The discs are insert molded with the gear and as a single piece with shaft 13 and flanges 56 and 58. This assures tight fit between the gear and the discs.
In operation, when power driven rotation is applied to gear 7, the Friction between the gear and discs 52 and 54 will cause the discs and shaft 13 to rotate and cam 29' will be driven through flanges 56 and 58 engaging notches 60 and 62 of the cam. When it is desired to manually set the cam, shaft 13 is manually rotated to rotate the cam through flanges 56 and 58 engaging slots 60 and 62 while discs 52 and 54 overcome the friction between them and gear 7 to override the gear.
.
. .
Claims (5)
1. In a timer wherein electrical switch means are responsive to rotation of a cam programming means, said cam programming means responsive to manual drive means and motor drive means: a clutch means permitting said cam programming means to be manually rotated independent of said motor drive means comprising a rotating member coupled to said motor drive means a pair of discs tightly engaging opposite faces of said rotating member, and coupling means coupling said pair of discs to said cam programming means, said pair of discs having different coefficients of friction that said rotating member.
2. In a timer according to claim 1, wherein said rotating member is a gear and said discs are fixedly carried on a shaft and said cam programming means is freely rotatably carried about said shaft.
3. In a timer according to claim 2, wherein said coupling means includes at least one flange extending from one of said pair of discs and engaging a slot in said cam programming means.
4. In a timer according to claim 3, wherein said pair of discs, said flange and said shaft are a single piece.
5. In a timer according to claim 1, wherein said rotating member is a metal and said pair of discs are plastic.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12122480A | 1980-02-13 | 1980-02-13 | |
| US06/121/224 | 1980-02-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1136897A true CA1136897A (en) | 1982-12-07 |
Family
ID=22395334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000359954A Expired CA1136897A (en) | 1980-02-13 | 1980-09-09 | Timer utilizing novel clutch |
Country Status (2)
| Country | Link |
|---|---|
| BR (1) | BR8100812A (en) |
| CA (1) | CA1136897A (en) |
-
1980
- 1980-09-09 CA CA000359954A patent/CA1136897A/en not_active Expired
-
1981
- 1981-02-10 BR BR8100812A patent/BR8100812A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BR8100812A (en) | 1981-08-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |