Back to results
US 6,260,996 B1Granted
Hourglass with bypass duct
OwnerRichard K. Coleman, Jr.inventor
Life of this patent
Estimating the term…
Abstract
An hourglass that includes a mechanism for varying the amount of time measured with the hourglass. The hourglass includes a pair of reservoirs connected a constriction in a conventional manner, and includes a bypass duct that provides fluid communication between the reservoirs.
Claims12
An hourglass comprising:
- a first reservoir having a collecting end and a transfer end, the transfer end being smaller than the collecting end;
- a second reservoir having a collecting end and a transfer end, the transfer end being smaller than the collecting end;
- a necked duct extending between the transfer end of said first reservoir and the transfer end of said second reservoir, the necked portion providing a restricted fixed flow path between the first reservoir and the second reservoir;
- and
- a bypass duct extending between the collecting end of said first reservoir and the collecting end of said second reservoir, the bypass duct having a valve that allows capture of an amount of material used to measure time with the hourglass, so that the amount of granular material held in said first reservoir will flow from the first reservoir through the transfer end of said first reservoir through the necked duct and into the transfer end of said second reservoir when said first reservoir is placed over said second reservoir, and so that granular material held near the collecting end of said second reservoir is transferred to the bypass duct and retained in the bypass duct by the valve by tilting the second reservoir to allow the granular material to enter the bypass duct, so that the granular material held in the bypass duct by the valve is used as reference for comparisons of time measurements and flow through the bypass duct to the collecting end of the first reservoir.
2 more elements
An hourglass comprising:
- an amount of granular material;
- a first reservoir having a collecting end and a transfer end, the transfer end being smaller than the collecting end;
- a second reservoir having a collecting end and a transfer end, the transfer end being smaller than the collecting end;
- a necked duct joining the transfer end of said first reservoir and the transfer end of said second reservoir, the necked portion providing a restricted fixed flow path for allowing a slow and fixed flow rate of granular material between the first reservoir and the second reservoir;
- and
- a bypass duct extending between the collecting end of said first reservoir and the collecting end of said second reservoir, the bypass duct having a valve, so that an amount of the granular material held in said first reservoir will flow from the first reservoir through the transfer end of said first reservoir through the necked duct and into the transfer end of said second reservoir when said first reservoir is placed over said second reservoir, and so that granular material held near the collecting end of said second reservoir is transferred to the bypass duct and temporarily retained in the bypass duct by the valve by tilting the second reservoir to allow the granular material to enter the bypass duct and flow through the bypass duct to the collecting end of the first reservoir.
3 more elements
A method for storing, resetting and varying the amount of time measured by an hourglass, the method comprising:
- providing an hourglass having:
- a first reservoir having a collecting end and a transfer end, the transfer end being smaller than the collecting end;
- a second reservoir having a collecting end and a transfer end, the transfer end being smaller than the collecting end;
- a necked duct extending between the transfer end of said first reservoir and the transfer end of said second reservoir, the necked portion providing a restricted fixed flow path between the first reservoir and the second reservoir;
- and
- a bypass duct extending between the collecting end of said first reservoir and the collecting end of said second reservoir, the bypass duct having a valve;
- and
- tilting the hourglass so that an amount of granular material held in said first reservoir will flow from the first reservoir through the transfer end of said first reservoir through the necked duct and into the transfer end of said second reservoir when said first reservoir is placed over said second reservoir, and so that granular material held near the collecting end of said second reservoir is transferred to the bypass duct and selectively held in the bypass duct by the valve to allow use of the granular material as a time reference prior to flowing into to the collecting end of said first reservoir by tilting the second reservoir to allow the granular material to enter the bypass duct and flow through the bypass duct to the collecting end of the first reservoir.
5 more elements
Dependencies are inferred from the claim text.