Patent Publication Number: US-11653783-B2

Title: Telescopic rail

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority to PCT Application PCT/CN2019/130340 filed on Dec. 31, 2019, which is based on Chinese Application No. 201921622312.0 filed on Sep. 26, 2019, under U.S.C. § 119, the entire contents of which are hereby incorporated by reference. 
     TECHNICAL FIELD 
     The following relates to the field of a curtain, in particular to the field of a telescopic rail for curtain. 
     BACKGROUND OF INVENTION 
     Curtain is houseware installed at the window for light-shading. Generally, windows are provided in different sizes. Therefore, the width of the windows needed to be measured before curtains being produced and installed, such that curtain rails could be produced in accordance with the measurements. Such method is disadvantageous in that, on-site measurement is required, which costs lots of labor. 
     SUMMARY OF THE INVENTION 
     It is an object of an aspect of the invention to provide a telescopic rail of which the belt is allowed to be trimmed. 
     According to an aspect related to the invention, provided is a telescopic rail, comprising rails, two rotating wheels, a belt, a first traction block, and a second traction block. The rails include a first rail and a second rail which is slidably arranged inside the first rail; the two rotating wheels are respectively arranged at the two ends of the rails; the belt, which wraps around the outer periphery of the two rotating wheels, has a free end and a fixed end; the first traction block is arranged at the middle of the belt, wherein the first traction block comprises a first fixing device by which the first traction block could grip or release the belt; the second traction block is configured to grip the two ends of the belt, wherein the fixed end is gripped and fixed by the second traction block, and the free end is gripped by the second traction block and then stretches out of the second rail via a through-hole on the second rail, wherein the second traction block comprises a second fixing device by which the second traction block could grip or release the belt. 
     In a further aspect of the invention, the belt is a timing belt. 
     In a further aspect of the invention, the first traction block comprises a first main part and a first retaining structure, the first retaining structure comprises a first fixing plate and a first gripping portion for gripping the belt, wherein the belt is gripped between the first main part and the first gripping portion, the first fixing plate is fixed with the first main part by the first fixing device. 
     In a further aspect of the invention, the first main part comprises a first groove portion installed inside the rail and a first fixing portion partly extended out of the rail, wherein the first fixing portion is fixed with the first fixing plate by the first fixing device, and the belt is gripped in the first groove portion. 
     In a further aspect of the invention, the first fixing device is a screw. 
     In a further aspect of the invention, the second traction block comprises a second main part and a second retaining structure, the second retaining structure comprises a second fixing plate and a second gripping portion for gripping the belt, wherein the belt is gripped between the second main part and the second gripping portion, the second fixing plate is fixed with the second main part by the second fixing device. 
     In a further aspect of the invention, the second main part comprises a second groove portion installed inside the rail and a second fixing portion partly extended out of the rail, wherein the second fixing portion is fixed with the second fixing plate by the second fixing device, and the belt is gripped in the second groove portion. 
     In a further aspect of the invention, the second fixing device is a screw. 
     The present invention has following technical advantages: 
     The telescopic rail comprises a first rail and a second rail slidably arranged relative to each other, rotating wheels, a belt, a first traction block, and a second traction block. When the rail is put into use, loosen the first fixing device and the second fixing device to release the belt from the first traction block and the second traction block, then hold the free end of the belt and slide the first rail and the second rail relative to each other till the total length of the rails is qualified for the installation requirement, then tighten the first fixing device and the second fixing device to grip and secure the belt by the first traction block and the second traction block, after that cut off the surplus of belt extending out of the through-hole, thus the length of the telescopic rail could be adjusted on-site without preparatory measurements and customizations, which decreases the workload for measurements and improves the efficiency for installation. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The present invention will be described hereinafter in details with reference to the figures and the embodiments, wherein 
         FIG.  1    is a cross sectional view of a telescopic rail in contractive state of an embodiment according to the present invention; 
         FIG.  2    is a cross sectional view of a telescopic rail in extended state of an embodiment according to the present invention; 
         FIG.  3    is a cross sectional view taken along line A-A of  FIG.  1   ; 
         FIG.  4    is a cross sectional view taken along line B-B of  FIG.  1   ; 
         FIG.  5    is a cross sectional view taken along line C-C of  FIG.  2   ; 
         FIG.  6    is a cross sectional view taken along line D-D of  FIG.  2   ; 
     
    
    
     REFERENCE LIST 
     
         
         
           
             Rail  100 ; 
             First rail  101 ; 
             Second rail  102 ; 
             Through-hole  103 ; 
             Rotating wheel  200 ; 
             Belt  300 ; 
             Free end  301 ; 
             Fixed end  302 ; 
             First traction block  400 ; 
             First fixing device  401 ; 
             First main part  402 ; 
             First gripping portion  403 ; 
             First fixing plate  404 ; 
             Second traction block  500 ; 
             Second fixing device  501 ; 
             Second main part  502 ; 
             Second gripping portion  503 ; 
             Second fixing plate  504 . 
           
         
       
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Certain embodiments of the present invention are described in detail below, with reference to the accompanying drawings. It should be appreciated that the embodiments described here are only provided to describe and explain the present invention, but shall not be deemed as constituting any limitation on the present invention. 
     All relative descriptions herein such as, up, down, front, back, left, and right are with reference to the Figures, such terms and other directional terms should be interpreted with reference to the figures under discussion. Such terms are not intended as a limitation on the position in which the invention or components may be used, and are not intended as a limitation on the invention. 
     Numerical terms are not intended as a limitation or to imply a sequence, unless otherwise specified or made apparent by the context of the discussion. 
     Unless otherwise defined, terms such as “provide”, “arrange”, “connect” and especially any technical used herein may be understood broadly in connection with the technical solution by those skilled in the art. 
     Referring to  FIGS.  1  to  6   , provided is a telescopic rail, comprising rails  100 , two rotating wheels  200 , a belt  300 , a first traction block  400 , and a second traction block  500 . The rails  100  include a first rail  101  and a second rail  102  with one end slidably arranged inside the first rail  101 ; the two rotating wheels  200  are respectively arranged at the two ends of the rails  100 ; the belt  300 , which wraps around the outer periphery of the two rotating wheels  200 , has a free end  301  and a fixed end  302 . 
     Optionally, the belt  300  is a timing belt. 
     The first traction block  400  is arranged at the middle of the belt  300 , wherein the first traction block  400  comprises a first fixing device  401  by which the first traction block  400  could grip or release the belt  300 . 
     Preferably, the first fixing device  401  is a screw. 
     Further, the first traction block  400  comprises a first main part  402  and a first retaining structure, the first retaining structure comprises a first fixing plate  404  and a first gripping portion  403  for gripping the belt  300 , wherein the belt  300  is gripped between the first main part  402  and the first gripping portion  403 , the first fixing plate  404  is fixed with the first main part  402  by the first fixing device  401 . In a preferred embodiment, the first retaining structure is integrally-formed or formed by fixing the first fixing plate  404  and the first gripping portion  403  by a screw. 
     The first main part  402  comprises a first groove portion installed inside the rail  100  and a first fixing portion partly extended out of the rail  100 , wherein the first main part  402  is fixed with the first fixing plate  404  at the first fixing portion by the first fixing device  401 , and the belt  300  is gripped in the first groove portion. 
     The second traction block  500  is configured to grip the two ends of the belt  300 , wherein the second traction block  500  comprises a second fixing device  501  by which the second traction block  500  could grip or release the belt  300 . 
     In a preferred embodiment, the second fixing device  501  is a screw. The fixed end  302  of the belt  300  is fixed to the second traction block  500 , and the free end  301  of the belt  300  extends out of the second rail  102  via a through-hole  103  on the second rail  102 . 
     The telescopic rail comprises a first rail  101  and a second rail  102  slidably arranged relative to each other, rotating wheels  200 , a belt  300 , a first traction block  400 , and a second traction block  500 . When the length of the rail needs to be regulated, loosening the first fixing device  401  and the second fixing device  501  to release the belt  300  from the first traction block  400  and the second traction block  500 , then holding the free end  301  of the belt  300  and slide the first rail  101  and the second rail  102  relative to each other till the total length of the rails  100  is qualified for the installation requirement, then tightening the first fixing device  401  and the second fixing device  501  to grip and secure the belt  300  by the first traction block  400  and the second traction block  500 , after that cutting off the surplus of belt  300  extending out of the through-hole  103 . Therefore, the adjustments of the telescopic rail  100  can be done on-site without preparatory measurements and customizations, which decreases the workload for measurements and improves the efficiency for installation. 
     In an embodiment, the second traction block  500  comprises a second main part  501  and a second retaining structure, the second retaining structure comprises a second fixing plate  504  and a second gripping portion  503  for gripping the belt  300 , wherein the belt  300  is gripped between the second main part  502  and the second gripping portion  503 , the second fixing plate  504  is fixed with the second main part  502  by the second fixing device  501 . Specifically, the second main part  502  comprises a second groove portion installed inside the rail  100  and a second fixing portion partly extended out of the rail  100 , wherein the second main part  501  is fixed with the second fixing plate  504  at the second fixing portion by the second fixing device  501 , and the belt  300  is gripped in the second groove portion. Preferably, the second retaining structure is integrally-formed or formed by fixing the second gripping portion  503  and the second fixing plate  504  by a screw. 
     There are two work conditions of the telescopic rail, wherein the telescopic rail of the first work condition is in a contractive state as illustrated in  FIGS.  1 ,  3  and  4    and the telescopic rail of the second work condition is in an extended state as illustrated in  FIGS.  2 ,  5  and  6   . In contractive state, the fixed end  302  of the belt  300  is fixed to the second traction block  500 , and other part of the belt  300  is released from both of the first gripping portion  403  and the second gripping portion  503 , then hold the free end  301 , after the rail is extended to a total length of the rail that is qualified for requirements, tightening the first fixing device  401  and the second fixing device  501  to grip and secure the belt  300  by the first gripping portion  403  and the second gripping portion  503 . 
     The embodiment described hereinbefore is merely preferred embodiment of the present invention and not for purposes of any restrictions or limitations on the invention. It will be apparent that any non-substantive, obvious alterations or improvement by the technician of this technical field according to the present invention may be incorporated into ambit of claims of the present invention.