Unequal-torque coil spring and spring motor thereof
AssigneesAnli Spring Co., Ltd., Hsien-Te Huang
InventorsHsien-Te Huang, Ta-Peng Huang
Life of this patent
Estimating the term…
Abstract
An unequal-torque coil spring and a spring motor thereof which is adapted for a curtain set that can automatically fold back a curtain; the same provides a feedback torque that responds to different stages of a curtain-folding working process and generates various corresponding torque in response, as each of the different stages requires a different force. Consequently, the curtain can be folded back at a steady speed, and positionally fixed at any height when the curtain is lowered.
Claims8
An unequal-torque coil spring, wherein feedback torque is provided in response to requirements of unequal forces at a loading end, comprises a long strip of reed strip;
- the reed strip has different sections longitudinally disposed from a front end to a rear end thereof, and the sections have different curvatures formed by getting coiled and bent inwards to generate different torque;
- an exposed end serving as a joining end, wherein the reed strip has torque distributed as follows:
- an increasing torque is implemented between the joining end and a first length,
- a first torque that follows the increasing torque and slowly increases is implemented between the first length and a second length, a second torque that follows the first torque and is equal to a maximum value of the first torque is implemented between the second length and a third length, and
- a third torque that follows the second torque and gradually decreases is implemented between the third length and a fourth length.
A spring motor being applied in a curtain set, which steadily folds a curtain and allows a lower beam to be lowered and fixed at any heights, comprising:
- a housing;
- a first reel drum and a second reel drum being axially parallel to each other and located at two sides inside of the housing at a same height;
- an axle and a coiling axle being axially parallel to each other and located centrally inside the housing at a same height;
- a chainring axially linked to an end of the first reel drum;
- a chainring axially linked to an end of the second reel drum;
- a chainring being axially movable at an end of the axle;
- a linking chainring axially linked to an end of the coiling axle;
- each of the chainrings and the linking chainring are of a same diameter, and are arranged and engaged from a front end to a rear end;
- an unequal-torque coil spring for providing feedback torque in response to requirements of unequal forces at a loading end, comprises a long strip of reed strip;
- the reed strip has different sections longitudinally disposed from a front end to a rear end thereof, and the sections have different curvatures formed by getting coiled and bent inwards to generate different torque;
- an exposed end serving as a joining end, wherein the reed strip has torque distributed as follows:
- an increasing torque is implemented between the joining end and a first length, a first torque that follows the increasing torque and slowly increases is implemented between the first length and a second length, a second torque that follows the first torque and is equal to a maximum value of the first torque is implemented between the second length and a third length, and a third torque that follows the second torque and gradually decreases is implemented between the third length and a fourth length;
- the unequal-torque coil spring being axially and movably sleeved outside of a cylindrical surface of the axle, the disposed joining end is joined to a radial cylindrical surface of the coiling axle.
Dependencies are inferred from the claim text.