Buffer apparatus of rolling curtain

Abstract

A buffer apparatus for rolling curtain. The buffer apparatus is disposed in a reel of the rolling curtain, including a housing, a clutch mechanism disposed in the housing and movable between an adjoining position and a separated position and a driving shaft fitted in the housing and drivingly connected with the clutch mechanism. One end of the driving shaft protrudes from the housing to connect with a rotary disc. The rotary disc is drivable by the reel to drive and rotate the driving shaft and operate the clutch mechanism. When the reel forward rotates to drop the drape of the curtain, the clutch mechanism is moved from the adjoining position to the separated position and no damping effect is created. When the reel backward rotates to wind the drape and a certain length of the drape remains, the clutch mechanism is moved from the separated position to the adjoining position. At this time, the rotary disc operates a damping mechanism to provide damping effect so as to provide a buffering effect when the reel winds the drape.

1 . A buffer apparatus for rolling curtain, the buffer apparatus being disposed in a reel of the rolling curtain to provide a buffering effect when the reel winds a drape of the rolling curtain, the buffer apparatus comprising: 
 a housing which is an elongated body, the length of the housing being parallel to the axis of the reel; a first cavity being formed in right end of the housing;    a clutch mechanism disposed in the first cavity and movable between an adjoining position and a separated position along the length of the housing;    a driving shaft fitted in the housing and movable along the length of the housing; a left end of the driving shaft protruding from a left end of the housing;    a reducing mechanism disposed in the first cavity between the clutch mechanism and the driving shaft; an inner end of the driving shaft being connected with a left end of the reducing mechanism; a right end of the reducing mechanism being connected with a left end of the clutch mechanism, by means of the reducing effect of the reducing mechanism, the driving shaft drives the clutch mechanism to operate, the driving shaft and the clutch mechanism being synchronously displaceable;    a resilient member disposed in the housing for applying a resilient force onto the clutch mechanism, whereby when the clutch mechanism is positioned in the adjoining position, the resilient member makes the clutch mechanism and the driving shaft tend to move toward the right end of the housing;    a damping mechanism disposed at left end of the housing for providing a damping effect;    a one-way transmission member connected with the damping mechanism for providing a one-way transmission effect; and    a rotary disc fixedly connected with outer end of the driving shaft, an outer circumference of the rotary disc being connected with inner circumference of the reel by insertion, the rotary disc being rotatable along with the reel to drive the driving shaft, the rotary disc being also drivable by the driving shaft to displace along the axis of the reel, whereby when the clutch mechanism is positioned in the adjoining position, the rotary disc can drive the one-way transmission member and when the rotary disc drives the one-way transmission member to rotate in forward direction, the one-way transmission member will not provide any transmission effect so that the damping mechanism will not operate, when the rotary disc is forward rotated along with the reel, the clutch mechanism being driven to move from the adjoining position to the separated position, whereby the clutch mechanism drives the driving shaft and the rotary disc to displace toward left end of the housing, in the separated position, the rotary disc being unable to drive the one-way transmission member, whereby when the reel forward rotates to release the drape of the curtain, the damping mechanism will not operate, when the reel backward rotates to wind the drape and a certain length of the drape remains unwound, the clutch mechanism being moved from the separated position to the adjoining position, whereby the rotary disc can drive the one-way transmission member to backward rotate for operating the damping mechanism to create damping effect so as to buffer the rotational speed of the reel.    
     
     
         2 . The buffer apparatus as claimed in  claim 1 , wherein the right end of the housing has a first cam section and the clutch mechanism including a clutch member having a second cam section on right end face, the clutch member being pivotally disposed in the first cavity and rotatable within the first cavity and movable along the length of the housing, the first and second cam sections being opposite to each other, a left end of the clutch member being connected with the reducing mechanism, whereby in the adjoining position, the two cam sections are dislocated from each other, the clutch member being pushed by the resilient member to displace toward the right end of the housing, when the clutch member is rotated to the separated position, the two cam sections overlapping each other to make the clutch member displace toward the left end of the housing by a certain distance.  
     
     
         3 . The buffer apparatus as claimed in  claim 1 , wherein the clutch mechanism includes a shafted member and a clutch member, the shafted member being fixedly disposed at the right end of the housing, a left end face of the shafted member facing the first cavity and being formed with a first cam section, the clutch member having a disc section and a second cam section disposed on right end face of the disc section, the second cam section having a certain arch length, the clutch member being positioned between the shafted member and the reducing mechanism, a right end of the clutch member being pivotally connected with the shafted member and rotatable and slidable relative to the shafted member, the first and second cam sections being opposite to each other, a left end of the clutch member being connected with the reducing mechanism, whereby in the adjoining position, the two cam sections are dislocated from each other, the clutch member being pushed by the resilient member to displace toward the right end of the housing, when the clutch member is rotated to the separated position, the two cam sections overlapping each other to make the clutch member displace toward the left end of the housing.  
     
     
         4 . The buffer apparatus as claimed in  claim 3 , wherein a shaft section is disposed on left end face of the shafted member, a right end face of the clutch member being formed with a connecting hole, the shaft section of the shafted member being fitted in the connecting hole, whereby the clutch member can be rotated and slid relative to the shafted member.  
     
     
         5 . The buffer apparatus as claimed in  claim 1 , wherein the circumference of the first cavity is formed with a predetermined number of insertion channels along the length of the housing, the reducing mechanism being a reducing gear set having a casing and a predetermined number of reducing gears mounted in the casing, the reducing gears being drivable by the driving shaft, outer circumference of the casing being formed with a predetermined number of ribs inserted in the insertion channels, the reducing gear set and the clutch mechanism being synchronously displaceable without rotation.  
     
     
         6 . The buffer apparatus as claimed in  claim 5 , wherein the casing is a hollow cylindrical body having an interior cylindrical chamber, an inner circumference of the casing being formed with an annular splined section, the reducing gear set further including: 
 a planet gear shaft having a disc section, a connector being disposed at right end of the disc section, the planet gear shaft being rotatably mounted in the casing with the connector extending out of the right end of the casing; and    a predetermined number of planet gears concentrically pivotally disposed on left end face of the disc section, outer circumferences of the planet gears being engaged with the splined section of the inner circumference of the casing, the reducing gear set being connected with the clutch mechanism via the connector of the planet gear shaft, a gear section being disposed at inner end of the driving shaft, the gear section extending into the casing of the reducing gear set for driving the planet gears to rotate, whereby the planet gear shaft can drive the clutch mechanism to operate.    
     
     
         7 . The buffer apparatus as claimed in  claim 1 , wherein the damping mechanism includes a damper which is a coil spring, an outer circumference of the damper abutting against inner circumference of left end of the housing to provide a damping effect.  
     
     
         8 . The buffer apparatus as claimed in  claim 7 , wherein the damping mechanism further includes a controller disposed at left end of the housing, the one-way transmission member being connected with the controller, whereby when the rotary disc is backward rotated, the rotary disc can drive the controller via the one-way transmission member so as to operate the damper.  
     
     
         9 . The buffer apparatus as claimed in  claim 7 , wherein a second cavity is formed in the left end of the housing, the damper being disposed in the second cavity to abut against inner circumference of the second cavity.  
     
     
         10 . The buffer apparatus as claimed in  claim 9 , wherein one end of the damper is an inward extending protruding end, the damping mechanism further including a controller which is a hollow cylindrical body, a shift section being formed in the controller, the controller being fitted around the left end of the housing and drivable by the one-way transmission member to rotate, the shift section extending into the second cavity and being positioned in the damper, whereby when the controller is rotated, the shift section shifts the protruding end.  
     
     
         11 . The buffer apparatus as claimed in  claim 1 , wherein the one-way transmission member is a one-way bearing, the buffer apparatus further comprising a linking collar fitted around the one-way transmission member and rotatable about the left end of the housing, the left end of the driving shaft extending out of the linking collar to fixedly connect with the rotary disc, whereby when the clutch mechanism is positioned in the adjoining postion, the rotary disc can drive the linking collar to rotate, while when the clutch mechanism is positioned in the separated position, the rotary disc cannot drive the linking collar.  
     
     
         12 . The buffer apparatus as claimed in  claim 11 , wherein a touch section is disposed at left end of the linking collar and at least one trigger section is disposed at right end of the rotary disc, whereby when the clutch mechanism is positioned in the adjoining postion, the trigger section can drive the touch section and thus the rotary disc can drive the linking collar to rotate, while when the clutch mechanism is positioned in the separated position, the trigger section is spaced from the touch section so that the rotary disc cannot drive the linking collar.  
     
     
         13 . The buffer apparatus as claimed in  claim 12 , wherein the linking collar includes an outer sleeve section and an inner sleeve section which are both hollow cylindrical bodies, the one-way transmission member being fitted in the inner sleeve, the outer sleeve being fitted around the inner sleeve, the touch section being disposed at left end of the outer sleeve section.  
     
     
         14 . The buffer apparatus as claimed in  claim 5 , wherein the resilient member is disposed in the first cavity, one end of the resilient member abutting against inner wall face of the first cavity, while the other end of the resilient member abutting against the reducing mechanism.  
     
     
         15 . The buffer apparatus as claimed in  claim 1 , wherein a shaft tube is disposed in the housing, a left end of the shaft tube outward protruding from the housing, a right end of the shaft tube communicating with the first cavity, the driving shaft being fitted in the shaft tube.  
     
     
         16 . A buffer apparatus for rolling curtain, the buffer apparatus being disposed in a reel of the rolling curtain to provide a buffering effect when the reel winds a drape of the rolling curtain, the buffer apparatus comprising: 
 a housing which is an elongated body, the length of the housing being parallel to the axis of the reel; a cavity being formed in the housing;    a clutch mechanism disposed in the cavity and movable between an adjoining position and a separated position along the length of the housing;    a driving shaft fitted in the housing and movable along the length of the housing; a right end of the driving shaft being connected with the clutch mechanism to drive the clutch mechanism to operate, the driving shaft and the clutch mechanism being synchronously displaceable; a left end of the driving shaft protruding from a left end of the housing;    a resilient member disposed in the housing for applying a resilient force onto the clutch mechanism, whereby when the clutch mechanism is positioned in the adjoining position, the resilient member makes the clutch mechanism and the driving shaft tend to move toward the right end of the housing;    a damping mechanism disposed at left end of the housing for providing a damping effect;    a one-way transmission member connected with the damping mechanism for providing a one-way transmission effect; and    a rotary disc fixedly connected with outer end of the driving shaft, an outer circumference of the rotary disc being connected with inner circumference of the reel by insertion, the rotary disc being rotatable along with the reel to drive the driving shaft, the rotary disc being also drivable by the driving shaft to displace along the axis of the reel, whereby when the clutch mechanism is positioned in the adjoining position, the rotary disc can drive the one-way transmission member and when the rotary disc drives the one-way transmission member to rotate in forward direction, the one-way transmission member will not provide any transmission effect so that the damping mechanism will not operate, when the rotary disc is forward rotated along with the reel, the clutch mechanism being driven to move from the adjoining position to the separated position, whereby the clutch mechanism drives the driving shaft and the rotary disc to displace toward left end of the housing, in the separated position, the rotary disc being unable to drive the one-way transmission member, whereby when the reel forward rotates to release the drape of the curtain, the damping mechanism will not operate, when the reel backward rotates to wind the drape and a certain length of the drape remains unwound, the clutch mechanism being moved from the separated position to the adjoining position, whereby the rotary disc can drive the one-way transmission member to backward rotate for operating the damping mechanism to create damping effect so as to buffer the rotational speed of the reel.