Patent Publication Number: US-11643858-B2

Title: Plastic door check without steel fasteners

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to U.S. Provisional Patent Application No. 62/930,041, filed Nov. 4, 2019, the subject matter of which is incorporated herein by reference in entirety. 
    
    
     BACKGROUND 
     Field 
     The present patent application relates to a door check device for installation between a motor vehicle body and a motor vehicle door that swings in opposing opening and closing directions relative to the motor vehicle body. 
     Description of Related Art 
     Door check devices are well-known in the art for use in checking the swinging motion of automotive/motor vehicle doors. These door check devices generally comprise a link member with one or more sets of detents and a housing that contains a pair of spring-biased rolling elements. The link member is inserted through the housing so that the rolling elements are engaged in rolling contact with the surfaces thereof under their respective spring biasing. Either the link member or the housing is secured to the motor vehicle door panel and the other of the link member and the housing is secured to the motor vehicle body. As the vehicle door panel is swung open, the link member moves relative to the housing. When the rolling elements are received within a set of detents on the link member, the detents and rolling elements cooperate to maintain the link member and housing against relative movement until a force sufficient to overcome the biasing on the rolling elements and disengage the rolling elements from the detents is applied to the vehicle door panel. As a result, the door check device functions to yieldingly maintain the vehicle door panel in position based on the cooperation between the rolling elements and the detents. 
     Current plastic door check devices use steel fasteners, such as rivets/pins/screws to secure the two halves of the housing of the door check device together. These steel fasteners require corrosion plating and add additional weight to the door check device. Further, the processing time to install these steel fasteners can increase cost of the door check device. 
     Consequently, it would be advantageous to provide an improved door check device that obviates the shortcomings associated with the prior art door check devices discussed above. 
     Brief Summary 
     In one embodiment of the present patent application, a door check device is provided for installation between a vehicle body and a vehicle door that swings in opposing opening and closing directions relative to the vehicle body. The door check device comprises a housing assembly and an elongated link member. The housing assembly comprises a first mounting structure constructed and arranged to be mounted on one of the vehicle body and the vehicle door; a biasing structure; a first link member engaging structure and a second link member engaging structure; and a plastic housing member containing the biasing structure, the first link member engaging structure and the second link member engaging structure therein. The plastic housing member has a first engagement structure. The first mounting structure has a plastic cover. The plastic cover has a second engagement structure that is constructed and arranged to engage with the first engagement structure to form an area of contact therebetween. The plastic housing member and the plastic cover are secured by fusion of the materials to each other in the area of contact between the first and the second engagement structures. 
     The elongated link member extends through the housing assembly. The elongated link member comprises a second mounting structure constructed and arranged to be mounted on the other of the vehicle body and the vehicle door; and detents that extend generally in a transverse direction of the elongated link member on opposing face surfaces thereof. When the door check device is installed and the vehicle door is swung in the opposing opening and closing directions thereof relative to the vehicle body, the elongated link member and the housing assembly are configured to move relative to each other with the first and the second link member engaging structures travelling along the opposing face surfaces of the elongated link member. 
     When the door check device is installed and the vehicle door is swung in the opposing opening and closing directions thereof relative to the vehicle body, the biasing structure is configured to bias the first and the second link member engaging structures relatively towards one another to thereby urge the first and the second link member engaging structures into engagement with the opposing face surfaces of the elongated link member. When the door check device is installed and the vehicle door is swung to a location with respect to the vehicle body, the first and the second link member engaging structures cooperate with the detents on the opposing face surfaces of the elongated link member so as to maintain the vehicle door at that position until a force is applied to the vehicle door that is sufficient to cause the elongated link member and the housing assembly to move relative to each other so as to urge the first and the second link member engaging structures relatively apart from one another and out of cooperation the detents on the opposing face surfaces of the elongated link member against the biasing of the biasing structure. 
     These and other aspects of the present patent application, as well as the methods of operation and functions of the related elements of structure and the combination of parts and economies of manufacture, will become more apparent upon consideration of the following description with reference to the accompanying drawings, all of which form a part of this specification, wherein like reference numerals designate corresponding parts in the various figures. In one embodiment of the present patent application, the structural components illustrated herein are drawn to scale. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the present patent application. It shall also be appreciated that the features of one embodiment disclosed herein can be used in other embodiments disclosed herein. As used in the specification and in the claims, the singular form of “a”, “an”, and “the” include plural referents unless the context clearly dictates otherwise. In addition, as used in the specification and the claims, the term “or” means “and/or” unless the context clearly dictates otherwise. It should also be appreciated that some of the components and features discussed herein may be discussed in connection with only one (singular) of such components, and that additional like components which may be disclosed herein may not be discussed in detail for the sake of reducing redundancy. 
     Other aspects, features, and advantages of the present patent application will become apparent from the following detailed description, the accompanying drawings, and the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Various embodiments are disclosed, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, in which 
         FIG.  1    shows an exploded view of a door check device in accordance with an embodiment of the present patent application; 
         FIG.  2    shows another exploded view of the door check device in accordance with an embodiment of the present patent application; 
         FIG.  3    shows a perspective, assembled view of the door check device, with a portion of the housing removed for clarity purposes, in accordance with an embodiment of the present patent application; 
         FIG.  4    shows a perspective view of a plastic housing member and a plastic cover of the door check device secured to each other in accordance with an embodiment of the present patent application; 
         FIG.  5    shows a front, perspective view of the plastic cover of the door check device in accordance with an embodiment of the present patent application; 
         FIG.  6    shows a rear, perspective view of the plastic housing member of the door check device in accordance with an embodiment of the present patent application; 
         FIG.  7    shows a partial, cross-sectional view of the plastic housing member and the plastic cover of the door check device secured to each other in accordance with an embodiment of the present patent application; 
         FIG.  8    shows a front, perspective view of the plastic housing member of the door check device in accordance with an embodiment of the present patent application; 
         FIG.  9    shows a right side view of the plastic housing member of the door check device in accordance with an embodiment of the present patent application; 
         FIG.  10    shows a rear view of the plastic housing member of the door check device in accordance with an embodiment of the present patent application; 
         FIG.  11    shows a cross-sectional view of the plastic housing member of the door check device taken along the line A-A of  FIG.  9    in accordance with an embodiment of the present patent application; 
         FIG.  12    shows a cross-sectional view of the plastic housing member of the door check device taken along the line B-B of  FIG.  10    in accordance with an embodiment of the present patent application; 
         FIG.  13    shows a cross-sectional view of the plastic housing member of the door check device taken along the line D-D of  FIG.  9    in accordance with an embodiment of the present patent application; 
         FIG.  14    shows detail C of  FIG.  11    of the plastic housing member of the door check device in accordance with an embodiment of the present patent application; and 
         FIG.  15    shows a front view of the plastic cover of the door check device in accordance with an embodiment of the present patent application; 
         FIG.  16    shows a side, perspective view of the plastic cover of the door check device in accordance with an embodiment of the present patent application; 
         FIG.  17    shows a cross-sectional view of the plastic cover of the door check device taken along the line D-D of  FIG.  15    in accordance with an embodiment of the present patent application; 
         FIG.  18    shows a rear view of the plastic cover of the door check device in accordance with an embodiment of the present patent application; 
         FIG.  19    shows a cross-sectional view of the plastic cover of the door check device taken along the line B-B of  FIG.  15    in accordance with an embodiment of the present patent application; and 
         FIG.  20    shows detail C of  FIG.  19    of the plastic cover of the door check device in accordance with an embodiment of the present patent application. 
     
    
    
     DETAILED DESCRIPTION OF THE DRAWINGS 
     Referring to  FIGS.  1 - 20   , a door check device  10  for installation between a vehicle body and a vehicle door that swings in opposing opening and closing directions relative to the vehicle body is provided. The construction of the motor vehicle, the vehicle body thereof and the vehicle door thereof are not considered to be part of the present patent application and thus will not be detailed herein. Instead, the present patent application is concerned in detail with the door check device  10 . 
     The door check device  10  comprises a housing assembly  11  and an elongated link member  16 . The housing assembly  11  comprises a first mounting structure  12  that is constructed and arranged to be mounted on one of the vehicle body and the vehicle door. In one embodiment, the first mounting structure includes a plastic cover  12 . The elongated link member  16  comprises a second mounting structure  14  that is constructed and arranged to be mounted on the other of the vehicle body and the vehicle door. 
     The mounting structures  12 ,  14  are referred to as “first” and “second” mounting structures to reflect the fact that the door check device  10  may be installed either by mounting the first mounting structure  12  to the vehicle door and the second mounting structure  14  to the vehicle body or by mounting the first mounting structure  12  to the vehicle body and the second mounting structure  14  to the vehicle door. In the illustrated embodiment, the first mounting structure  12  is constructed and arranged to be mounted within the interior of the vehicle door and the second mounting structure  14  is constructed and arranged to be mounted to the vehicle body. 
     The housing assembly  11  further comprises biasing structures  13 ,  15 , a first link member engaging structure  18 , and the second link member engaging structure  20 , and a plastic housing member  21 . 
     The plastic housing member  21  containing the biasing structures  13 ,  15 , the first link member engaging structure  18  and the second link member engaging structure  20  therein. That is, the plastic housing member  21  may be in the form of an open-ended container that includes an interior space  39  for containing the first link member engaging structure  18 , the second link member engaging structure  20  and the biasing structures  13 ,  15 . 
     In one embodiment, the plastic housing member  21  is made from a nylon material, a polypropylene material, or an Acrylonitrile Butadiene Styrene (ABS) material. In one embodiment, the plastic housing member  21  is made from other plastic materials, other polymer materials, other thermoplastic materials, other thermoplastic polymer materials, or other synthetic polymer materials that are configured to be secured to another plastic/polymer member/material by fusion of their materials. In one embodiment, many different types of plastic/polymer material can be used for door check device  10  and can be fused together with non-mechanical fastening methods. 
     The first link member engaging structure  18  and the second link member engaging structure  20  may be identical to one another. The first link member engaging structure  18  and the second link member engaging structure  20  each may include a roller, a ball or a bearing that is configured to roll/slide over the elongated link member  16 . The first link member engaging structure  18  and second link member engaging structure  20  each have a spring bearing portion that contacts the corresponding coil springs  13 ,  15 . 
     The first link member engaging structure  18  and the second link member engaging structure  20  may in some embodiments move/pivot relative to the housing assembly  11  with the elongated link member  16  such that the first link member engaging structure  18  and the second link member engaging structure  20  remain transverse relation to the elongated link member  16 . 
     The first link member engaging structure  18  and the second link member engaging structure  20  may include complementary contact surfaces  34 ,  36 , respectively that are constructed and arranged to interface with and contact the first and second face surfaces  28 ,  30  of the elongated link member  16 . Thus, as the vehicle door is swung in the opposing opening and closing directions thereof relative to the vehicle body, the elongated link member  16  moves relative to the housing assembly  11  with the complementary contact surface  34  of the first link member engaging structure  18  sliding and travelling along the first face surface  28  of the elongated link member  16  and the complementary contact surface  36  of the second link member engaging structure  20  sliding and travelling along the second face surface  30  of the elongated link member  16 . In one embodiment, the complementary contact surface  34  of the first link member engaging structure  18  and the complementary contact surface  36  of the second link member engaging structure  20  may have spherical configurations. In one embodiment, the complementary contact surface  34  of the first link member engaging structure  18  and the complementary contact surface  36  of the second link member engaging structure  20  may have convex configurations. 
     The biasing structure of the housing assembly  11  includes a pair of biasing elements in the form of coil springs  13 ,  15  contained within the plastic housing member  21 . The plastic housing member  21  may include annular protrusions on opposing interior walls thereof in order to locate corresponding coil springs  13 ,  15 . It is not necessary to use a pair of coil springs  13 ,  15  as the biasing structure to urge the first link member engaging structure  18  and second link member engaging structure  20  relatively towards one another and into engagement with first and second face surfaces  28 ,  30  of the elongated link member  16 . A single spring (e.g., tension, compression or coil) could be used as the biasing structure to bias one of the first link member engaging structure  18  and the second link member engaging structure  20  relative to the other of the first link member engaging structure  18  and the second link member engaging structure  20 , which remains unbiased and may be fixed against movement toward and away from the elongated link member  16 . A fixed engaging structure need not be a separate component, and may be integrality formed into the housing, such as by molding. Likewise, a single biasing structure can bias both movable link member engaging structures towards one another. Any suitable biasing arrangement for urging the first link member engaging structure  18  and the second link member engaging structure  20  relatively towards one another can be used. 
     The elongated link member  16  is configured to extend through the housing assembly  11 . The elongated link member  16  has a first opposing end that provides a connecting portion  24  and a second opposing end that provides a stop portion  26 . An intermediate portion  22  of the elongated link member  16  extends between the first and second opposing ends and provides the first and second opposing face surfaces  28 ,  30 . In one embodiment, the elongated link member  16  comprises durable low-friction coating (e.g., a mineral-filled nylon coating) thereon. 
     The connecting portion  24  of the elongated link member  16  may have a bore  25  therethrough and the connecting portion  24  is pivotally connected to the second mounting structure  14 . In the illustrated embodiment, the second mounting structure  14  has two arms  27 ,  29  with pivot pin receiving bores  31 ,  33  that are used to pivotally connect with the connecting portion  24  via a stepped pivot pin  35 . Specifically, the second mounting structure  14  and the connecting portion  24  of the elongated link member  16  are pivotally connected by aligning bores  25 ,  31 ,  33  with the connecting portion  24  of the elongated link member  16  between the two arms  27 ,  29  of the second mounting structure  14  and inserting the pivot pin  35  therethrough. The second mounting structure  14  also may have a bore  37 . The second mounting structure  14  is mounted to the vehicle body by use of a bolt inserted through the bore  37 . Alternatively, the bore  37  may be omitted and the second mounting structure  14  may be mounted to the vehicle body by welding. 
     The elongated link member  16  may include a plurality of ramp portions R 1 , R 2 , and R 3  and a plurality of detents DU 1 , DL 1 ; DU 2 , DL 2 ; and DU 3 , DL 3 . The ramp portions R 1 , R 2 , and R 3  are formed adjacent each other and are separated by the detents DU 1 , DL 1 ; DU 2 , DL 2 ; and DU 3 , DL 3 . More specifically, the ramp portions R 1 , R 2 , and R 3  each have a larger cross-sectional size than the remainder of the link member&#39;s intermediate portion  22  and have upper and lower detents DU 1 , DL 1 ; DU 2 , DL 2 ; and DU 3 , DL 3  defined therebetween. In the illustrated embodiment, the first and second face surfaces  28 ,  30  of the elongated link member  16  are essentially flat, except for the detent regions. In the illustrated embodiment, three ramp portions and three pairs of detents are shown. In another embodiment, the number of the ramp portions and the pairs of detents on the elongated link member  16  may vary. The detents DU 1 , DL 1 ; DU 2 , DL 2 ; and DU 3 , DL 3  extend generally in a transverse direction T-T of the elongated link member  16  on the opposing face surfaces  28 ,  30  thereof. The detents DU 1 , DL 1 ; DU 2 , DL 2 ; and DU 3 , DL 3  have a concave configuration. 
     The stop portion  26  of the elongated link member  16  serves to limit relative movement between the elongated link member  16  and the housing assembly  11 , thereby defining a maximum open position for the vehicle door. The stop portion  26  of the elongated link member  16  is configured to prevent the elongated link member  16  from being withdrawn from between the first and second link member engaging structures  18 ,  20 . Also, when the door check device  10  is installed and the vehicle door is swung to its fully open position, the stop portion  26  is configured to prevent the vehicle door from moving beyond the fully open position thereof. Specifically, a portion  49  of the stop portion  26  is configured to engage the plastic housing member  21  to prevent any further movement. The stop portion  26  may in some embodiments be formed from a polymeric material that will cushion the impact and prevent impact noise. Usually, the stop portion  26  is used in conjunction with a stop provided on the vehicle door&#39;s hinge. 
     The elongated link member  16  is received between the first link member engaging structure  18  and the second link member engaging structure  20  that are contained within the housing assembly  11 . The first and second face surfaces  28 ,  30  of the elongated link member  16  interface with and contact the complementary contact surfaces  34 ,  36  of the first and second link member engaging structures  18 ,  20 , respectively. Thus, as the vehicle door is swung in the opposing opening and closing directions thereof relative to the vehicle body, the elongated link member  16  moves relative to the housing assembly  11  with the first link member engaging structure  18  sliding or travelling along the first face surface  28  of the elongated link member&#39;s intermediate portion  22  and the second link member engaging structure  20  sliding or travelling along the second face surface  30  of the elongated link member&#39;s intermediate portion  22 . 
     The present patent application is not intended to be limited to complementary relationships per se and may encompass any type of engaged relationship that tends to restrict relative transverse movement between the elongated link member  16  and the first and second link member engaging structures  18 ,  20 . These types of relationships may be broadly referred to as transverse movement restricting relationships. However, a complementary relationship is described here because it provides for a smooth and relatively quiet interaction between the elongated link member  16  and the first and second link member engaging structures  18 ,  20 . 
     The first and second link member engaging structures  18 ,  20  are biased to remain in rolling/sliding engagement with respective first and second face surfaces  28 ,  30  of the elongated link member  16  with the use of the biasing structure that includes the pair of biasing elements in the form of coil springs  13 ,  15  contained within the housing assembly  11 . The coil springs  13 ,  15  contact the first and second link member engaging structures  18 ,  20  to affect the biasing of the first and second link member engaging structures  18 ,  20 , respectively. As a result of this engagement, the first and second link member engaging structures  18 ,  20  move/slide as the elongated link member  16  is moved relative to the housing assembly  11 . 
     The biasing structure with two springs  13 ,  15  and two retainers/link member engaging structures  18 ,  20  (i.e., with/without ball/roller) are located between the plastic cover  12  and the plastic housing member  21 . The plastic housing member  21  and the plastic cover  12  include aligned openings  41 ,  43  through which the elongated link member  16  is passed. 
     The plastic cover  12  of the housing assembly  11  includes aligned and spaced apart generally holes  45 ,  47  that are bored or stamped therethrough. The housing assembly  11  is mounted within the interior of the vehicle door by use of mounting bolts  44 ,  46  inserted through these holes  45 ,  47  in the plastic cover  12 . In one embodiment, the mounting bolts  44 ,  46  may have heads that are configured to cooperate with the holes  45 ,  47  in the plastic cover  12 . For example, in one embodiment, the heads of the mounting bolts  44 ,  46  may have a star shaped configuration portion  57   a  and a round plate like configuration portion  59   a  over the star shaped configuration portion  57   a . In one embodiment, the holes  45 ,  47  in the plastic cover  12  may have complementary shaped configuration portions  57   b ,  59   b  to receive the corresponding star shaped configuration portions  57   a  and the round plate like configuration portions  59   a  on the heads of the mounting bolts  44 ,  46 . That is, in one embodiment, holes  45 ,  47  are not preform holes to accept the studs  44 ,  46 . In one embodiment, the threaded fasteners/mounting bolts  44 ,  46  are overmolded during the injection mold process of the cover  12 . The net shape of the holes  45 ,  47  are configured to compliment the shape of the fastener ( 44 ,  46 ) head. In one embodiment, the shape of the fastener head is developed to meet torque out and pull out requirements so as to ensure that they don&#39;t come loose or fall out during the assembly process to the vehicle and/or normal use. 
     In one embodiment, the plastic cover  12  is made from a nylon material, a polypropylene material, or an Acrylonitrile Butadiene Styrene (ABS) material. In one embodiment, the plastic cover  12  is made of other plastic materials, other polymer materials, other thermoplastic materials, other thermoplastic polymer materials, or other synthetic polymer materials that are configured to be secured to another plastic/polymer member/material by fusion of their materials. In one embodiment, many different types of plastic/polymer material can be used for door check device  10  and can be fused together with non-mechanical fastening methods. 
     The plastic door check device  10  uses non-mechanical fastening methods to secure the two halves (i.e., plastic housing member  21  and plastic cover  12 ) of the housing assembly  11  of the door check device  10  together. 
     The plastic housing member  21  has a first engagement structure  51 . The plastic cover  12  has a second engagement structure  53  that is constructed and arranged to engage with the first engagement structure  51  to form an area of contact therebetween. The plastic housing member  21  and the plastic cover  12  are secured by fusion of the materials to each other in the area of contact between the first and the second engagement structures  51  and  53 . 
     In one embodiment, one of the first engagement structure  51  of the plastic housing member  21  and the second engagement structure  53  of the plastic cover  12  include a groove and the other of the first engagement structure  51  of the plastic housing member  21  and the second engagement structure  53  of the plastic cover  12  include a tenon/tongue. In one embodiment, the tenon is constructed and shaped to follow the profile of the groove. That is, an outside surface of the tenon is configured to match with an inside surface of the groove. In one embodiment, the tenon includes a tongue, a tab, a ridge, or a protrusion that is configured to match the profile of the groove and is configured to form-fit within the groove. 
     The first engagement structure  51  on the plastic housing member  21  and the second engagement structure  53  on the plastic cover  12  are each formed on the corresponding mating surfaces of the plastic housing member  21  and the plastic cover  12 , respectively. 
     In one embodiment, the first engagement structure  51  of the plastic housing member  21  and the second engagement structure  53  of the plastic cover  12  are each configured to extend around the entire periphery of the plastic housing member  21  and the plastic cover  12 , respectively. In another embodiment, the first engagement structure  51  of the plastic housing member  21  and the second engagement structure  53  of the plastic cover  12  are each configured to extend only around portions of the periphery of the plastic housing member  21  and the plastic cover  12 , respectively. 
     The first engagement structure  51  of the plastic housing member  21  and the second engagement structure  53  of the plastic cover  12  are configured to interact with each other to properly locate the plastic housing member  21  and plastic cover  12  onto/with one another. The first engagement structure  51  of the plastic housing member  21  and the second engagement structure  53  of the plastic cover  12  are not only used as locating features to locate the plastic housing member  21  and plastic cover  12  during the assembly process but also used as main attachment features between the plastic housing member  21  and plastic cover  12  to fuse the plastic housing member  21  and plastic cover  12  together during the ultrasonic welding process. 
     During the assembly process, the first engagement structure  51  of the plastic housing member  21  and the second engagement structure  53  of the plastic cover  12  are configured to sacrificially deform when exposed to vibrations from an ultrasonic welder. The ultrasonic welder is configured to fuse the two parts (i.e., the plastic cover  12  and the plastic housing member  21 ) together and contain the internal components (i.e., springs  13 ,  15  and sliders  18 ,  20 ). The bonding of the two components (i.e., the plastic cover  12  and the plastic housing member  21 ) is sufficiently strong to withstand the forces imposed by the door check arm/elongated link member  16  when sliding in/out of the door check device  10 , as well as the forces from the internal springs  13 ,  15 . 
     In one embodiment, the plastic cover  12  is assembled onto the plastic housing member  21  in a direction perpendicular to spring force direction. For example, the spring force direction may either be downwardly from the spring  13  to the door check arm/elongated link member  16  or be upwardly from the spring  15  to the door check arm/elongated link member  16 . In one embodiment, the plastic cover  12  is assembled onto the plastic housing member  21 , from one side thereof, and in the direction perpendicular to the spring force direction. Therefore, the internal springs  13 ,  15  do not interfere with the fusion. 
     In one embodiment, ultrasonic welding of the plastic cover  12  and the plastic housing member  21  is performed by providing high frequency vibrations from the ultrasonic welder. The ultrasonic welder is configured to contact a surface of the plastic cover  12  or the plastic housing member  21 . The vibrations from the ultrasonic welder may cause intermolecular friction between the plastic cover  12  and the plastic housing member  21 . This increases a temperature at portions where the plastic cover  12  and the plastic housing member  21  contact. The increase in temperature melts the plastic material causing a flow of plastic material between the plastic cover  12  and the plastic housing member  21 . After the vibrations from the ultrasonic welder are stopped, the plastic material solidifies and a weld results between the plastic cover  12  and the plastic housing member  21 . 
     In another embodiment, alternative non-mechanical fastening methods may be used to secure the two halves (i.e., the plastic cover  12  and the plastic housing member  21 ) of the door check device  10  together. For example, such alternative non-mechanical fastening methods may include laser welding, or any other process that fuses two door check components together without the use of mechanical fasteners that are staked, spun or screwed together. 
     When the door check device  10  is installed and the vehicle door is swung in the opposing opening and closing directions thereof relative to the vehicle body, the elongated link member  16  and the housing assembly  11  are configured to move relative to each other with the first and the second link member engaging structures  18  and  20  travelling along the opposing face surfaces  28 ,  30  of the elongated link member  16 . 
     When the door check device  10  is installed and the vehicle door is swung in the opposing opening and closing directions thereof relative to the vehicle body, the biasing structures  13 ,  15  is configured to bias the first and the second link member engaging structures  18  and  20  relatively towards one another to thereby urge the first and the second link member engaging structures  18  and  20  into engagement with the opposing face surfaces  28 ,  30  of the elongated link member  16 . 
     When the door check device  10  is installed and the vehicle door is swung to a location with respect to the vehicle body, the first and the second link member engaging structures  18  and  20  cooperate with the detents DU 1 , DL 1 ; DU 2 , DL 2 ; or DU 3 , DL 3  on the opposing face surfaces  28 ,  30  of the elongated link member  16  so as to maintain the vehicle door at that position until a force is applied to the vehicle door that is sufficient to cause the elongated link member  16  and the housing assembly  11  to move relative to each other so as to urge the first and the second link member engaging structures  18  and  20  relatively apart from one another and out of cooperation the detents DU 1 , DL 1 ; DU 2 , DL 2 ; or DU 3 , DL 3  on the opposing face surfaces  28 ,  30  of the elongated link member  16  against the biasing of the biasing structures  13 ,  15 . 
     As the elongated link member  16  is moved in the longitudinal direction thereof due to vehicle door opening and closing movements, the first and second link member engaging structures  18 ,  20  move/slide along the face surfaces  28 ,  30  of the elongated link member  16  and may be configured to accommodate any relative yaw movement of the elongated link member  16 . 
     Specifically, because of the structure and configuration of the first and second link member engaging structures  18 ,  20 , the first and second link member engaging structures  18 ,  20  are able to move relative to and within the housing assembly  11  in the illustrated non-limiting embodiment. This permits the first and second link member engaging structures  18 ,  20  to be maintained in proper alignment with respective face surfaces  28 ,  30  of the elongated link member  16  as the elongated link member  16  causes the relative yaw position of the housing assembly  11  to change with respect to the elongated link member  16  that is passing through the housing assembly  11 . Thus, the first and second link member engaging structures  18 ,  20  pivot together relative to the housing assembly  11  to remain perpendicular to the elongated link member  16  as it shifts in a yaw-type manner. 
     The friction between the first and second link member engaging structures  18 ,  20  and the elongated link member  16  due to the load from the coil springs  13 ,  15  is sufficient to cause the first and second link member engaging structures  18 ,  20  to move/slide together with the elongated link member  16  as it undergoes yaw movement. Specifically, the frictional characteristics (i.e., coefficient of friction) of the elongated link member  16  and the first and the second link member engaging structures  18 ,  20  is selected in such a way that they will effectively remain engaged in perpendicular relation as the elongated link member  16  undergoes yaw movement. 
     The term “yaw” in the context of the present patent application is used to describe the movement that the elongated link member  16  may undergo relative to the housing assembly  11  generally along a yaw plane that is defined as extending along both the transverse direction and the longitudinal extent of the elongated link member  16 . This yaw movement of the elongated link member  16  can occur as a result of the path along which the vehicle door swings. Also, this movement can occur as a result of free play being permitted between the connection of the first mounting structure  12  and the second mounting structure  14  of the elongated link member  16  to the vehicle body and the vehicle door. 
     By allowing the first and the second link member engaging structures  18 ,  20  to move along with the elongated link member  16  in its yaw movement, the first and the second link member engaging structures  18 ,  20  can remain in their respective movement restricting relationships with the face surfaces  28 ,  30 . Additionally, the upper and lower detents will not become misaligned with respect to the first and the second link member engaging structures  18 ,  20 . 
     Continued movement of the elongated link member  16  relative to the first mounting structure  12  causes the first and the second link member engaging structures  18 ,  20  to contact the first ramp portion R 1  and then roll up the first ramp portion R 1 . As the first and the second link member engaging structures  18 ,  20  roll up/slide past the first ramp portion R 1 , the movement of the first and the second link member engaging structures  18 ,  20  in a direction away from the elongated link member  16  deflects the coil springs  13 ,  15 . As the deflection of the coil springs  13 ,  15  increases, the resistance they provide to door movement likewise increases. As the first and the second link member engaging structures  18 ,  20  pass over the apexes of the first ramp portion R 1 , the increased biasing force in coil springs  13 ,  15  biases the first and the second link member engaging structures  18 ,  20  into engagement with the elongated link member  16  in a cooperating relation with the upper and lower detents DU 1 , DL 1 . This is the first checked position. 
     The first and the second link member engaging structures  18 ,  20  are constructed and arranged such that when the vehicle door is swung to the checked position with respect to the vehicle body with the first and the second link member engaging structures  18 ,  20  received within the upper and lower detents DU 1 , DL 1 ; DU 2 , DL 2 ; or DU 3 , DL 3 , the first and the second link member engaging structures  18 ,  20  and the detents DU 1 , DL 1 ; DU 2 , DL 2 ; or DU 3 , DL 3  cooperate to maintain the vehicle door at this checked position until a force is applied to the motor vehicle door sufficient to cause the elongated link member  16  to move relative to the first and the second link member engaging structures  18 ,  20  so as to urge the first and the second link member engaging structures  18 ,  20  generally apart from one another against the biasing of the coil springs  13 ,  15 , thus moving the first and the second link member engaging structures  18 ,  20  out of their respective detents DU 1 , DL 1 ; DU 2 , DL 2 ; or DU 3 , DL 3 . Specifically, the door check device  10  functions to maintain the checked position until the force applied to the vehicle door is sufficient to move the elongated link member  16  relative to the first and the second link member engaging structures  18 ,  20  so as to cause the first and the second link member engaging structures  18 ,  20  to ride up one of the plurality of ramp portions R 1 , R 2 , and R 3  and over the apexes thereof against the resistance of the coil springs  13 ,  15 . The force required to cause the first and the second link member engaging structures  18 ,  20  to ride up one of the plurality of ramp portions R 1 , R 2 , and R 3  is determined by the spring constant and the heights and geometries of the plurality of ramp portions R 1 , R 2 , and R 3 . 
     As noted in the discussions above, the elongated link member  16  may include more than one pair of upper and lower detents DU 1 , DL 1 ; DU 2 , DL 2 ; and DU 3 , DL 3  to provide more than one checked position. 
     In one embodiment, there is a weight advantage to eliminate the steel fasteners from the plastic door check device  10 . In addition, the processing time for an ultrasonic weld is reduced compared to prior art methods that used to secure steel pins/rivets/screws. This can be a cost advantage to produce the door check device  10 . 
     Although the present patent application has been described in detail for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that the present patent application is not limited to the disclosed embodiments, but, on the contrary, is intended to cover modifications and equivalent arrangements that are within the spirit and scope of the appended claims. In addition, it is to be understood that the present patent application contemplates that, to the extent possible, one or more features of any embodiment can be combined with one or more features of any other embodiment. 
     The illustration of the embodiments of the present patent application should not be taken as restrictive in any way since a myriad of configurations and methods utilizing the present patent application can be realized from what has been disclosed or revealed in the present patent application. The systems, features and embodiments described in the present patent application should not be considered as limiting in any way. The illustrations are representative of possible construction and mechanical embodiments and methods to obtain the desired features. The location and/or the form of any minor design detail or the material specified in the present patent application can be changed and doing so will not be considered new material since the present patent application covers those executions in the broadest form. 
     The foregoing illustrated embodiments have been provided to illustrate the structural and functional principles of the present patent application and are not intended to be limiting. To the contrary, the present patent application is intended to encompass all modifications, alterations and substitutions within the spirit and scope of the appended claims.