Time indicating apparatus and transmission mechanism therefor
AssigneeNew England Business Service, Inc.
InventorFrancis W. Rowbottam
Life of this patent
Estimating the term…
Abstract
A time clock is provided which includes a minute wheel that is advanced every minute and an hour wheel that must be advanced every hour, wherein a deflecting pawl device is utilized, in place of gears, to connect the wheels. Both wheels have ratchet teeth, and a pawl that oscilltes once each minute to advance the minute wheel. The minute wheel, which rotates once every hour, has a cam that moves beside the pawl to deflect it sidewardly so that the pawl engages a tooth on the hour wheel. Thus, at the next oscillation of the pawl, both wheels are advanced. The minute wheel bears the numbers 0 through 59, while the hour wheel bears the numbers 1 through 12 repeated five times, so that both wheels have 60 numbers.
Claims11
A timing device comprising:
- a minute wheel having 60 numbers 0 through 59 formed thereon;
- an hour wheel having a portion forming the numbers 1 through 12 repeated five times so that there are 60 numbers thereon;
- and
- means for rotating said wheels about a predetermined axis, said means rotating said minute wheel by one-sixtieth turn every minute, and rotating said hour wheel by one-sixtieth turn after each complete rotation of said minute wheel.
Wheel driving apparatus comprising:
- first and second rotatable wheels,
- means for advancing said first and second wheels, including a movable advancing device normally engaged with said first wheel, said advancing device being deflectable to also engage and supply-force in the direction of rotation of said second wheel to advance it;
- and
- deflecting cam means mounted on said first wheel to move with it, for deflecting said advancing device into engagement with said second wheel while remaining engaged with said first wheel, at a predetermined rotational position of said first wheel, whereby to intermittently advance the second wheel as a predetermined ratio of advancement of the first wheel.
Wheel driving apparatus comprising:
- first and second rotatable wheels, each having a series of ratchet teeth;
- a pawl device having a base, a pawl, and an arm coupling said base to said pawl and normally holding said pawl adjacent to the ratchets on said first wheel, said arm extending in a primarily circumferential direction and being resiliantly sidewardly deflectable;
- means for reciprocating said pawl device to oscillate said pawl in circumferential directions over the ratchet teeth of said first wheel;
- and
- deflecting cam means mounted on said first wheel to move with it, for deflecting said pawl device so that said pawl moves into engagement with said second wheel while remaining engaged with said first wheel, at a predetermined rotational position of said first wheel.
Wheel driving apparatus comprising:
- first and second rotatable wheels, each having a series of ratchet teeth;
- means for advancing said first wheel, including a pawl device having a base, a pawl, and an arm coupling said base to said pawl and normally holding said pawl adjacent to the ratchets on said first wheel, said advancing means also including a link having one end pivotally coupled to said base of said pawl device and means for reciprocating said link, thereby to oscillate said pawl over the ratchet teeth of said first wheel;
- and
- deflecting cam means mounted on said first wheel to move with it, for deflecting said pawl device into engagement with said second wheel while remaining engaged with said first wheel, at a predetermined rotational position of said first wheel;
- said link having a stop (127) which engages a tooth on said first wheel at the end of each movement of said link in a predetermined forward direction during which said pawl advances said first wheel, whereby to limit the forward movement of said first wheel during each advancement thereof.
A timing device comprising:
- a minute wheel and an hour wheel, both rotatably mounted about the same axis, and each having a series of ratchet teeth spaced thereabout;
- a pawl device including a pawl and a deflectable support for said pawl;
- means for reciprocating said pawl device so that said pawl thereof normally moves over the ratchet teeth of said minute wheel to advance it;
- and
- a cam mounted on said minute wheel so it moves beside said pawl during each rotation of said minute wheel, said cam being positioned to deflect said pawl into engagement with a ratchet tooth of said hour wheel, while said pawl also engages a tooth of the minute wheel, whereby to engage and advance said hour wheel during each turn of the minute wheel.
Dependencies are inferred from the claim text.