Patent Publication Number: US-2018037196-A1

Title: Windscreen wiper device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of U.S. Provisional Patent Application Ser. No. 62/371,074, filed Aug. 4, 2016, entitled “Windscreen Wiper Device”, the entire disclosure of the application being considered part of the disclosure of this application and hereby incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention is related, generally, to windscreen wiper devices and port particularly to the connecting devices of windscreen wiper devices. 
     2. Related Art 
     Wiper devices typically fall into one of three basic categories: conventional, beam and hybrid. Conventional blades utilize a frame structure which consists of a system of yokes arranged in a tournament-style construction to distribute a biasing force from an oscillating wiper arm across a length of an elastomeric wiper blade. Beam blades utilize a carrier element, which typically includes one or more longitudinal strips of spring steel, to distribute the biasing force along the length of the wiper strip. Hybrid blades typically include both a frame structure and a carrier element to distribute the biasing force from the wiper arm. 
     In beam blades, a connecting device is attached directly to the carrier element. In some cases, the connecting device is glued/bonded with the carrier element, and in others, the connecting device is ultrasonically welded with the carrier element. 
     SUMMARY OF THE INVENTION AND ADVANTAGES 
     One aspect of the present invention is related to a windscreen wiper device which includes a wiper blade that is made of an elastomeric material and that extends lengthwise in a longitudinal direction. The wiper device also includes a carrier element which is pre-curved to have a curved shape when in a relaxed condition. The carrier element operatively supports the wiper blade and biases the wiper blade into a curved shape. The carrier element has a pair of opposing lateral edges, and at least one of the lateral edges has a notched formed into it. A connector base is operably connected with the carrier element. The base includes at least one projection which is received in the at least one notch of the carrier element for restricting relative movement between the connector base and the carrier element in the longitudinal direction. The connector base also includes a plurality of locking arms which engage around the lateral edges of the carrier element to lockingly connect the connector base with the carrier element. The plurality of locking arms includes at least one long locking arm on one lateral side of the connector base and includes at least one short locking arm on an opposite lateral side of the connector base form the at least one long locking arm. The at least one short locking arm has a lateral width which is less than the at least one long locking arm. The at least one short locking arm has a ramped lower surface for allowing the at least one short locking arm to snappingly engage the carrier element. 
     The wiper device according to this embodiment advantageously allows the connector base to be more quickly, simply and firmly secured with the carrier element in a cost effective manner. 
     According to another aspect of the present invention, the connector base includes at least two short locking arms and at least two long locking arms. 
     According to yet another aspect of the present invention, the carrier element includes at least one notched formed into each of the lateral edges, and the connector base includes a pair of projections which are received into the notches. 
     According to still another aspect of the present invention, the at least two locking arms are located on opposite longitudinal sides of one of the projections, and the at least two short locking arms are located on opposite longitudinal sides of another of the projections. 
     According to a further aspect of the present invention, each of the long legs has an upper surface with a curved end for allowing the base to be rotated relative to the carrier element during installation of the base onto the carrier element to snappingly engage the short locking arms with the carrier element. 
     According to yet a further aspect of the present invention, the connector base is made of a single piece of injection molded plastic. 
     According to still a further aspect of the present invention, a joint part is pivotably connected with the connector base. 
     Another aspect of the present invention is related to a method of making a windscreen wiper device. The method includes the step of operably connecting a pre-curved carrier element that has opposing lateral edges with notches formed therein with an elastomeric wiper blade to bias the wiper blade into a curved shape. The method continues with the step of preparing a connector which includes a base that has a bottom wall with at least one projection formed therein and also has at least one short locking arm that extends from one lateral side of the bottom wall and at least one long locking arm that extends from an opposite lateral side of the bottom wall. The at least one short locking arm has a ramped lower surface. The method proceeds with the step of inserting one lateral edge of the carrier element into a gap between the at least one long locking arm and the bottom wall of the base rotating the base relative to the carrier element until the ramped surface of the at least one short locking arm contacts an opposite lateral edge of the carrier element. The method continues with the step of flexing the base by continued rotation of the base relative to the carrier element. The method proceeds with the step of snappingly engaging the at least one short locking arm of the base around an opposite lateral edge of the carrier element from the at least one long locking arm. The method continues with the step of receiving the at least one projection in the at least one notch of the carrier element. 
     According to another aspect of the present invention, the base of the connector is made as a single piece of injection molded plastic. 
     According to yet another aspect of the present invention, the at least one long locking arm includes a chamfered distal end for facilitating the rotation of the base relative to the carrier element. 
     According to still another aspect of the present invention, the carrier element includes a pair of longitudinal strips. 
     According to a further aspect of the present invention, the carrier element includes a pair of notches, and the base includes a pair of projections. 
     According to yet a further aspect of the present invention, the base includes a pair of short locking arms and a pair of long locking arms. 
     According to still a further aspect of the present invention, the short locking arms are located on opposite longitudinal sides of one of the projections and the long locking arms are located on opposite longitudinal sides of the other of the projections. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other aspect, features and advantages of the invention will become more readily appreciated when considered in connection with the following detailed description of the presently preferred embodiment and best mode, appended claims and accompanying drawings, in which: 
         FIG. 1  is a perspective elevation view of an exemplary embodiment of a windscreen wiper device constructed in accordance with one aspect of the present invention; 
         FIG. 2  is a fragmentary and enlarged view of a portion of the wiper device of  FIG. 1 ; 
         FIG. 3  is a fragmentary and perspective elevation view of an underside of a portion of the wiper device of  FIG. 1 ; 
         FIG. 4  is a fragmentary and perspective elevation view of a carrier element and a wiper blade of the wiper device of  FIG. 1 ; 
         FIG. 5  is a perspective and elevation view of a base of a connector of the wiper device of  FIG. 1 ; 
         FIG. 6  is a fragmentary and bottom elevation view of the wiper device of  FIG. 1 ; 
         FIG. 7  is a cross-sectional view of the wiper device taken through Line  7 - 7  of  FIG. 6 ; 
         FIG. 8  is a cross-sectional view of the wiper device taken through Line  8 - 8  of  FIG. 6 ; and 
         FIG. 9  is a cross-sectional view of the wiper device of  FIG. 1  showing the connector base being attached with the longitudinal strips. 
     
    
    
     DETAILED DESCRIPTION OF THE ENABLING EMBODIMENT 
     Referring to the Figures, wherein like numerals indicate corresponding parts throughout the several views, an exemplary embodiment of a windscreen wiper device  20  is generally shown in  FIG. 1 . The windscreen wiper device  20  has a beam-style construction in that it includes a carrier element  22  (shown in  FIGS. 3 and 4 ) which extends lengthwise in a longitudinal direction and is pre-shaped to bias a wiper blade  24  that is made of an elastomeric material, such as rubber, into a curved shape. The curved shape of the wiper blade  24  allows its entire length to be sealed and remain sealed against a curved windshield (not shown) of a vehicle as the windscreen wiper device  20  oscillates back and forth across the windshield. That is, in the exemplary windscreen wiper device  20 , the pre-curved carrier element  22 , rather than a series of yokes, distributes a force from an oscillating wiper arm (not shown) across the length of the wiper blade  24 . 
     The exemplary windscreen wiper device  20  also includes a pair of covers  26 , which are made as separate pieces from one another and are attached with the carrier element  22 . Although they are not in the exemplary embodiment, the covers  26  may be shaped to impart a downforce on the wiper blade  24  when the vehicle is travelling at speed to improve the fluid-tight seal between the wiper blade  24  and the windshield. A connector  28  is engaged with the carrier element  22  at approximately a longitudinal midpoint of the carrier element  22  and between the covers  26  for lockingly connecting the windscreen wiper device  20  with an oscillating wiper arm (not shown). A pair of end caps  30  are engaged with opposite ends of the carrier element  22  for retaining the covers  26  on the carrier element  22  between the connector  28  and the end caps  30 . As shown in  FIGS. 3 and 4 , in the exemplary embodiment, the carrier element  22  includes a pair of longitudinal strips  22  (also known as flexors) that are made of spring steel and that are received in longitudinally extending grooves of the wiper blade  24 . However, it should be appreciated that the carrier element could take other forms, e.g., the carrier element could be a single longitudinal strip that is glued to the wiper strip or it could be a single longitudinal strip that is received within a single longitudinal groove of a one-piece wiper strip and spoiler. 
     Referring now to  FIG. 4 , each of the longitudinal strips  22  has an outwardly facing lateral edge  32  which extends in the longitudinal direction along the length of the respective longitudinal strip  22 . The laterally outwardly facing edges  32  are provided with notches  34 , or recesses, formed therein at approximately their respective longitudinal midpoints such that the notches  34  are longitudinally aligned with one another. 
     Referring now to  FIGS. 1-3 , the connector  28  of the exemplary windscreen wiper device  20  includes a base  36  which is fixed with the longitudinal strips  22  and a joint part  38  which is pivotably connected with the base  36 . The exemplary joint part  38  is configured for attachment with bayonet-style and top lock-style oscillating wiper arms (not show) but may take any suitable shape for attachment with any suitable type of oscillating wiper arm. The pivoting connection between the base  36  and the joint part  38  allows the joint part  38  to be pivoted about a pivot axis relative to the base  36  when attaching the windscreen wiper device  20  with or detaching the windscreen wiper device  20  from an oscillating wiper arm. 
     The base  36  is made as a single piece of injection molded plastic and has a bottom wall  40  and a pair of side walls  42  that extend vertically upwardly from the bottom wall  40 . The side walls  42  are spaced from one another in a lateral direction and extend parallel to one another. A cylindrically shaped pin  44  is supported by the side walls  42  and extends in a lateral direction past each of the side walls  42 . The joint part  38  includes a pair of co-axial and circular-shaped openings which receive the pin  44  to establish the pivoting connection between the joint part  38  and the base  36 . The side walls  42  also present a pair of co-axially aligned windows  46  for receiving a side pin (not shown) to allow the connector to be attached with a side pin-style oscillating wiper arm (not shown). 
     As shown in  FIG. 3 , the underside of the base  36  includes a plurality of locking arms  48 ,  50  and a pair of projections  52  which cooperate with the longitudinal strips  22  to operably secure the connector  28  with the longitudinal strips  22 . The projections  52  are generally shelf-like in shape and are shaped similarly to the notches  34  in the longitudinal strips  22 . The projections  52  extend vertically downwardly from a lower surface of the bottom wall  40 . As shown, when the base  36  is connected with the longitudinal strips  22 , longitudinal end surfaces on the projections  52  abut corresponding edges of the longitudinal strips  22  to restrict relative movement between the base  36  and the longitudinal strips  22 . The locking arms  48 ,  50  wrap around the opposite lateral edges  32  of the longitudinal strips  22  to hold the base  36  with the longitudinal strips  22  and to hold the projections  52  in the notches  34 . Accordingly, the locking arms  48 ,  50  hold the base  36  on the longitudinal strips  22 , and the projections  52  restrict relative movement between the base  36  and the longitudinal strips  22 . 
     In the exemplary embodiment, the base  36  has two projections  52  which are positioned on opposite lateral sides of the underside of the bottom wall  40  and are generally aligned with one another in the longitudinal direction at approximately a longitudinal midpoint of the base  36 . The exemplary embodiment of the base  36  also includes a total of four locking arms  48 ,  50 , which includes a pair of long locking arms  48  on one lateral side of the base  36  for engaging one of the longitudinal strips  22  and a pair of short locking arms  50  on an opposite lateral side of the base  36  for engaging the other of the longitudinal strips  22 . In the longitudinal direction, the two long locking arms  48  are located on opposite sides of one of the projections  52  and the two short locking arms  50  are located on opposite sides of the other projection. In the exemplary embodiment, the long and short locking arms  48 ,  50  are spaced from opposite longitudinal ends of the base  36 . 
     As shown in  FIG. 7 , the long locking arms  48  have a greater width in the lateral direction than the short locking arms  50 . The distal ends of the long locking arms  48  are curved or chamfered downwardly (away from the longitudinal strips), and the short locking arms  50  have ramped lower surfaces. 
     Another aspect of the present invention is related to a method of making a windscreen wiper device  20 , such as the windscreen wiper device shown in  FIG. 1 . The method includes the step of inserting the longitudinal strips  22  of the carrier element  22  into opposing longitudinal grooves of the elastomeric wiper blade  24  to bias the wiper blade  24  into a curved shape. The method continues with the steps of preparing the connector  28  and inserting one lateral edge  32  of one of the longitudinal strips  22  into the gaps between the long locking arms  48  and the bottom wall  40  of the base  36  such that the projection  52  between the long locking arms  48  is received into the notch  34  of the longitudinal strip  22 . As shown in  FIG. 9 , the method proceeds with the step of rotating the base  36  relative to the longitudinal strips  22  until the ramped surfaces of the short locking arms  50  contact the lateral edge  32  of the other longitudinal strip  22 . The method continues with the step of elastically flexing the base  36  by continued rotation of the base  36  relative to the longitudinal strips  22 . This flexing automatically occurs due to the ramped surfaces of the short locking arms  50 . The method proceeds with the steps of snappingly engaging the short locking arms  50  of the base  36  around the opposite longitudinal strip  22  and receiving the projection  52  between the short locking arms  50  into the notch  34  of the longitudinal strip  22  connected therewith. The joint part  38  can be connected with the base  36  either before or after the base  36  is attached with the longitudinal strips  22 . 
     The resulting engagement between the base  36  and the longitudinal strips  22  does not involve the use of any of the adhesives, welding, fasteners or separate locking means that are commonly employed to attach a connector base with a longitudinal strip in a beam style wiper blade. Additionally, unlike other known wiper devices, the base does not have to be slid longitudinally from one end of the carrier element into its location. The joint part  38  may be coupled with the base  36  either before or after attaching the base  36  with the longitudinal strips  22 . 
     Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than specifically described. It should also be appreciated that the directional terms such as “upper”, “lower”, “top” and “bottom” are in reference to the orientations of the enabling embodiment of the invention shown in the Figures and are not meant to require any certain orientation. Additionally, it is to be understood that all features of all claims and all embodiments can be combined with each other, as long as they do not contradict each other.