Car door glass run

Abstract: A plurality of grooves (4) extending longitudinally at predetermined intervals in the width direction are formed in a bottom surface (31) of a door glass run (3A). The grooves (4) are designed so as to have sectional areas which become larger in order from the groove formed in a widthwise central portion of the bottom surface to the grooves formed on the opposite sides of the central portion in the bottom surface. Alternatively, the central portion of the bottom surface of the door glass run in the width direction is formed into a flat surface and grooves are formed only in the opposite side portions.

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door glass run to be attached on a door frame of a car door. 2. Description of Related Art As shown in Fig. 5, a door glass run 3 (hereinafter, simply referred to as a glass run) is attached on a door frame 2 of a door 1 of a car along an inner side of the door frame 2 for guiding up/down movement of a door glass 5 and sealing a gap between a circumferential edge of the closed door glass 5 and the door frame 2. Further, front and rear vertical extension frame portions 2A of the door flame 2 are provided in a door body and the glass run 3 is attached also on each of the vertical extension frame portions 2A. As such a glass run 3, generally, a glass run having such a configuration as shown in Fig. 6 is used, in which lips 35 and 36 extend, in a direction to face each other, from the opposite ends, at an opening side, of a body portion 30 which is U-shaped in section. In the glass run 3 attached on a vertical frame of a door frame 2 including extension frame portions 2A, the door glass 5 moves up/down in the state where a peripheral edge of the door glass 5 is in contact with, its opposite surfaces, between the lips 35 and 36 of the glass run 3, and an end surface of the door glass 5 is also in contact with a bottom surface 31 of the glass run 3. The bottom surface 31 of the glass run 3 is subject to smoothening treatment by spraying urethane resin, silicon resin, or the like so as to improve the slidability of the door glass 5. However, there has been a problem that foreign matters such as sand, dust, and the like may come into the body portion 30 of the glass run 3 and may deposit on the bottom surface 31 to thereby gradually lower the slidability of the door glass 5. US-A-5 265 377, which forms the basis of the preambles of the appended independent claims discloses a door glass run wherein equidistant grooves formed in the bottom surface of the glass run are inclined at a predetermined angle with respect to the sliding direction of the window glass. Such oblique grooves form communications between the outside and the inside of the window glass, by which the sealing might be negatively influenced. DE-A-2 127 097 discloses a glass run with an elastomeric profile within which guide strips are embedded to guide the window glass. Sealing of the window glass is performed by equidistant sealing ribs being integrally formed in a bottom surface of the elastomeric profile. Grooves formed between the ribs are formed such that if the grooves are filled with foreign matters the contact area between the foreign matters and the end surface of the door glass is big in comparison to the contact area of the end surface of the door glass with the tip ends of the ribs. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a glass run in which increase of the slidability and the durability of door glass against the glass run due to foreign matters entering the glass run can be suppressed and abnormal sounds can be prevented from occurring when the door glass is moved up/down without negatively influencing other functions of the glass run. A solution for this object is achieved by a glass run according to appended claim 1. Claims 2 to 10 are directed towards further advantageous features of the inventive glass run. Another solution for this object is achieved by a glass run according to appended claim 11. When the door glass moves up/down, the end surface of the door glass moves up/down while slightly transversely vibrating with respect to the central line of a bottom surface of a glass run because a car body vibrates or because the curvature of a door frame becomes slightly different from that of the door glass in accordance with the vertical position of the door glass. The present invention has paid attention onto the fact that foreign matters which deposit on a bottom surface of a glass run are swept out to the opposite sides by the end surface of door glass when the door glass vibrates transversely. That is, according to the invention, the foreign matters which have deposited on the central portion of the bottom surface of the glass run are swept into/out of the opposite sides when the door glass moves up/down, and the great part of the foreign matters are fallen into the large grooves formed in the opposite portions on the bottom surface to be thereby discharged. The groove formed in the central portion of the bottom surface is small and, hence, even if the groove is filled with the foreign matters, the glass sliding resistance does not become large so that no abnormal sounds are generated. Also according to the invention, foreign matters which have deposited on the bottom surface of the glass run are fallen into the grooves formed in the opposite portions on the bottom surface to be thereby discharged. Further, in case no groove is formed in the central portion of the bottom surface with which the door glass comes into slide-contact, the quantity of foreign matters which may remain against sweeping-out is very small and hence the sliding resistance is hardly increased. BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings: Fig. 1 is a sectional view showing a door glass run according to a first embodiment of the present invention, taken along line A-A in Fig. 5; Fig. 2 is a sectional view showing a door glass run according to a second embodiment of the present invention, taken along line A-A in Fig. 5; Fig. 3 is a sectional view showing a door glass run according to a third embodiment of the present invention, taken along line A-A in Fig. 5; Fig. 4 is a sectional view showing a door glass run according to a fourth embodiment of the present invention, taken along line A-A in Fig. 5; Fig. 5 is a view showing a car door to which the door glass run according to the present invention is applied; Fig. 6 is a sectional view showing an example of the conventional door glass run, taken along line A-A in Fig. 5; Fig. 7A is a sectional view showing a door glass run according to a fifth embodiment of the present invention and Fig. 7B is an enlarged sectional view of X portion in Fig. 7A; and Fig. 8A is a sectional view showing a door glass run according to a sixth embodiment of the present invention and Fig. 8B is an enlarged sectional view of Y portion in Fig. 8A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Fig. 1 shows a glass run 3A according to a first embodiment of the present invention. This glass run is attached on the vertical frame portion of the door frame 2 of the car shown in Fig. 5. The glass run 3A is formed of an extrusion molding of rubber, for example, EPDM (ethylene-propylene-diene) rubber, and has a fundamental configuration in which lips 35 and 36 extend from the opposite ends, at the opening side, of a body portion 30 U-shaped in section. A bottom wall is designed to be thicker than the remaining portion. Generally, a door glass 5 has a thickness of about 4 mm and an end surface arch-shaped in section. The door glass 5 moves up/down in the state where the door glass 5 is in contact with the lips 35 and 36 at its inner and outer surfaces, and a central portion of a side edge surface of the door glass 5 is in contact with a bottom surface 31 of the glass run 3A. In the glass run 3A, a plurality of uniform grooves 4 are formed in a bottom surface 31 so as to extend longitudinally at predetermined intervals widthwise to thereby reduce a sliding area between an end surface of door glass 5 and the bottom surface 31 and to thereby bury part of foreign matters entering the glass run into the grooves 4. Each of the grooves is shaped in the form of an inverted triangle in section. In this glass run 3A, by formation of the grooves 4 in the bottom surface 31 of the glass run 3A, the area of slide-contact between a door glass end surface and the bottom surface 31 of the glass run can be reduced, and foreign matters which have deposited on the bottom surface 31 of the glass run body portion 30 can be discharged into the grooves to thereby reduce the sliding resistance of the door glass against the bottom surface of the glass run. If the above glass run is used for a long time, there is a possibility that foreign matters are gradually accumulated in the grooves 4 so that the grooves 4 are filled with the foreign matters and the foreign matters accumulated in the grooves 4 come into slide-contact with the end surface of the door glass 5 to thereby increase the frictional resistance to generate abnormal sounds when door glass 5 is moved up/down. Fig. 2 shows a glass run 3B according to a second embodiment of the invention, which is provided for solving the aforementioned problem. In the glass run 3B shown in Fig. 2, a plurality of mutually-parallel grooves 4a, 4b, and 4c are formed in the bottom surface 31 to extend longitudinally at equal intervals widthwise. Each of the grooves is shaped in the form of an inverted triangle in section and the grooves are designed so as to have sectional areas which become larger in order from the groove formed in a widthwise central portion of the bottom surface 31 to the groove formed on each of the opposite sides of the central portion of the bottom surface 31. In the illustrated embodiment, the groove 4a is formed in the widthwise central position of the bottom surface 31; the grooves 4c are formed in the widthwise opposite-end portions; and the grooves 4b are formed in the intermediate portions between the grooves 4a and 4c. The opening width and depth of the groove 4a are selected to be about 0.2 - 0.3mm and about 0.2 - 0. 3mm, respectively. The opening width and depth of the groove 4c are selected to be about 0.7 - 1.0mm and about 0.4 - 0.6mm, respectively. The opening width and depth of the groove 4b are selected to be intermediate values between those of the grooves 4a and 4c. The widths of the land portions between the grooves 4a, 4b, and 4c are selected to be an equal value of 0.7 - 0.8mm. The bottom surface having the grooves 4a, 4b, and 4c formed therein and the surfaces of the lips 35 and 36 are subject to smoothening treatment S with urethane resin. The sectional shape of each of the grooves is not limited to such an inverted triangle but it may be shaped into a quadrangle. In the case of the thus formed glass run 3A, the end surface of the door glass 5 moves up/down while it is in slide-contact with the land portions of the bottom surface 31 of the glass run 3A when the door glass 5 moves up/down. In this case, the end surface of the door glass 5 is in slide-contact only with the land portions between the grooves so that an influence of foreign matters attached on the bottom surface 31 is reduced. Even if a large quantity of foreign matters have deposited, the foreign matters on the land portions are swept out right and left by the end surface of the door glass 5 transversely vibrating when the door glass is moved up/down, so that the foreign matters fall into the grooves 4a, 4b, and 4c. Further, even if the central groove 4a is filled with the foreign matters, the contact area of the foreign matters with the end surface of the door glass 5 is small so that the sliding resistance is not largely increased and no abnormal sounds are generated. Further, when the door glass moves up/down, the maximum width of transverse movement of the central portion of the end surface of the door glass 5 to contact with the bottom surface 31 of the glass run 3B by a transverse vibration of the door glass 5 is ranged within the distance between the grooves 4a and 4b. Because the groove 4b is larger than the groove 4a, the groove 4b is not completely filled with foreign matters before long-term use. Thus, even if the groove 4b is filled with foreign matters, the foreign matters hardly gives a large influence on the sliding resistance of the door glass 5. Since the foreign matters swept out by the door glass 5 are received into the grooves 4b and 4c, there is a function to prevent the swept-out foreign matters from falling to deposit again on the central portion of the glass run bottom surface 31. Fig. 3 shows a glass run 3C according to a third embodiment of the invention. In the glass run 3C shown in Fig. 3, a central portion of a bottom surface 31 is formed into a flat surface with no groove, and longitudinally extending grooves 4d and 4e are formed in the opposite side portions. The flat surface in the central portion is designed to have a width which is equal to the width of lateral or left/right vibration of the central portion of the end surface of the door glass 5 which contacts with the flat surface when the door glass 5 moves up/down. Specifically, the width of the flat surface is selected to be about 3 - 4mm. The opening width and depth of each of the grooves 4d and 4e on the opposite sides are selected to be 0.7 - 1.0mm and about 0.4 - 0.6mm, respectively. Similarly to the glass run 3B, in the case of the glass run 3C, foreign matters which have deposited on a bottom surface central portion with which the door glass 5 is in slide-contact are discharged into opposite-side grooves 4d and 4e. In the glass run 3C, since no groove is formed in the bottom surface central portion, the glass sliding.area is slightly increased correspondingly, in comparison with the glass run 3B. On the other hand, however, there is no groove in the central portion which may be filled with foreign matters. Accordingly, the end surface of the door glass 5 never come into slide-contact with the accumulated foreign matters in the central groove. Further, the glass run having the grooves formed in its bottom surface may be integrally molded with olefin thermoplastic elastomer. Fig. 4 shows a glass run 3D according to a fourth embodiment of the invention. In a glass run 3D shown in Fig. 4, a surface layer 32 which is formed of a material different from that of a glass run body and which is superior in smooth property is formed on the surface of a bottom wall of the body portion 30 so as to face an end surface of the door glass 5, and grooves for receiving foreign matters are formed in an upper surface 31 constituting a bottom wall of the glass run 3D. A surface layer 32a which is formed of a different material in place of carrying-out of smoothening treatment S and which is superior in smooth property may be formed on the surface of each of lips 35 and 36. The surface layer 32, 32a is formed of olefin group resin, for example, polyethylene, polypropylene, etc., or olefin group thermoplastic elastomer, and the surface layer 32 has the same grooves 4a, 4b, and 4c as those in the glass run 3D. Further, the upper surface 31 on the surface layer 32 may be formed in the same manner as that in the case of the glass run 3C. The surface layer 32 is integrally formed with an upper surface of a bottom wall of the glass run 3D by extrusion molding or by sticking of a tape member and fusion bonding thereafter. Incidentally, in the glass run 3D, it is not necessary to make the surface layer 32 be subjected to smoothening treatment by spraying or the like. The glass run body may be formed by using synthetic resin such as PVC (polyvinyl chloride) or the like, or olefin group thermoplastic elastomer, besides the foregoing EPDM rubber. Fig. 7 shows a glass run 3E according to a fifth embodiment of the present invention, to be attached on the door frame 2 shown in Fig. 5 so that the portion is positioned along the vertical frame portion of the door frame 2. The glass run 3E is obtained by extrusion-molding with TPO (olefin thermoplastic elastomer), and integrally provided with a body portion 30 substantially U-shaped in section; seal lips 35 and 36 extending from opened front ends of opposite side walls 312a and 312b of the body portion 30 so as to face each other; and mole lips 33a and 33b extending from the opened front ends of the opposite side walls 312a and 312b along the outsides of the opposite walls 312a and 312b reversely to the seal lips 35 and 36. The glass run 3E is attached on the door frame 2 in such a manner that the body portion 30 is fitted onto a channel portion 20 formed in an inner circumference of the door flame 2, and the mole lips 33a and 33b formed inside and outside a car are pressed against inside and outside walls 21a and 21b of the channel portion 20 opposite to the mole lips 33a and 33b respectively. In the glass run 3E, a coating film 6 of a sliding material is formed on the bottom surface 31 and the whole surface extending from the facing surfaces of the seal lips 35 and 36 to front ends of the mole lips 33a and 33b in the same manner as that in the case of the glass run 3B which is the second embodiment illustrated in Fig. 2. The seal lips 35 and 36 is in slide-contact with the door glass 5 while being in contact with the door glass 5 when the door glass 5 moves up/down, and the coating film 6 acts also as a coating member of a designed surface. Further, grooves 4d and 4e are formed in the bottom surface 31 so as to be in slide-contact with the end surface of the door glass 5 and are designed so as to have sectional areas which become larger in order from the groove formed in the widthwise central portion of the bottom surface 31 to the groove formed on each of the opposite sides of the central portion in the bottom surface 31. Further, also the surfaces of the groves 4d and 4e are covered with the same coating film 6 as described above so that the grooves 4d and 4e are not filled with foreign matters. As the material of the coating film 6, it is possible to use a mixture material obtained by mixing TPO with polypropylene or polyethylene which is fusible to TPO, or a mixture material obtained in such a manner that TPO and styrene are blended with each other and the thus obtained material is mixed with polypropylene, etc. Polypropylene gives hardness, brightness and a glass slidability to a coating film. Further, as the coating film 6, a polyethylene monomer or a polypropylene monomer may be also used. The coating film 6 may be extrusion-molded at the same time as the glass run 3E is extrusion-molded. The extrusion-molded coating film 6 is strongly bonded to the body portion 30 of the glass run 3E of TPO and is extremely glossy with improved brightness in comparison with TPO extrusion moldings. When the extrusion-molded glass run of TPO in which the whole designed surface appearing as the exterior surface is coated with the coating film 6 is connected at the molded corner portion of TPO, a difference in color tone between the extrusion moldings and the molded corner portion can be hardly perceived and hence the whole glass run has a sense of feeling of being united into one body to be attractive. Thus, the coating film 6 is extrusion-molded simultaneously with the glass run body portion 30 to thereby obtain the smoothness of the glass run 3E against the door glass 5 and the improvement of the exterior quality at the same time. Further, the coating film 6 is hardly peeled off. Fig. 8 shows a glass run 3F according to a sixth embodiment of the present invention. The glass run 3F is different from the glass run 3E in that there are provided no mole lips. Protrusions 34a and 34b are formed in opposite sides of a bottom portion of the glass run 3F to be engaged with stage portions 22a and 22b formed on the opposite side walls 21a and 21b of the channel portion 20 of the door flame 2 so that the glass run 3F is prevented from coming off. The structure of the glass run 3F is substantially the same as that of the glass run 3E and hence parts of the glass run 3F identical to those of the glass run 3D are correspondingly referenced. In the glass run 3F, a coating film 7 of a sliding material is formed on a bottom surface 31 and the whole designed surface which extends from glass slide-contacting portions of seal lips 35 and 36 to base portions of the same. The coating film 7 acts also as the designed coating member. The method of forming the coating film 7 and the quality of the sliding material are the same as those in the case of the glass run 3E and formation of the coating film 7 gives the same function and effects as those in the case of the glass run 3E. Similarly to the glass run of EPDM rubber, in the case of the glass run of TPO, the glass run with a body portion 30 having hardness of about 75 - 80 Hs (JIS-A type hardness) is used. The hardness of the coating film of the sliding material is selected to be about 35 - 45D (Shore D type hardness) in view of the glass slidability, the damage resistance property, and the contact property with a door glass surface. According to the present invention, by formation of the grooves in the bottom surface of the glass run, the area of slide-contact between a door glass end surface and the bottom surface of the glass run can be reduced, and foreign matters which have deposited on the bottom surface of the glass run can be discharged into the grooves to thereby reduce the sliding resistance of the door glass against the bottom surface of the glass run. By contriving the size and formation position of the grooves, even if the grooves are filled with foreign matters, the sliding resistance of the door glass is not largely increased by the accumulated foreign matters. Further, the glass runs of Figs. 7 and 8, the exterior cab be made attractive.

Claims: A door glass run adapted to be attached on a door frame (2) of a car door to guide up/down movement of a door glass, comprising: a body portion (30) adapted to be attached on the door frame (2) and having an opening and a bottom surface (31) with which an end surface of the door glass (5) contacts; lips (35, 36) disposed on opposite ends of the opening of said body portion so as to be in contact with the door glass from opposite surfaces thereof; and a plurality of grooves (4; 4a, 4b, 4c; 4d, 4e) being formed in said bottom surface of said body portion, characterized in that said grooves (4; 4a, 4b, 4c; 4d, 4e) extend longitudinally at predetermined intervals widthwise and are formed as to have sectional areas which become larger in order from one or two grooves (4; 4a; 4d) formed in a widthwise central portion of said bottom surface (31) to those formed on each of opposite sides of said central portion of said bottom surface. The door glass run according to claim 1, wherein an opening width and a depth of each of said grooves (4; 4a, 4b, 4c; 4d, 4e) become larger in order from the groove (4; 4a) formed in a widthwise central portion of said bottom surface to that formed on each of opposite sides of said bottom surface. A door glass run according to claim 1 or 2, characterised in that a widthwise central portion of said bottom surface (31) of said body portion (30) with which the end of the door glass (5) contacts is made to be a flat surface, and said plurality of grooves (4d, 4e) are formed at predetermined widthwise intervals on each of opposite side portions of said central flat surface portion. The door glass run according to claim 3, wherein the flat surface in the central portion is designed to have a width which is equal to the width of lateral vibration of the central portion of the end surface of the door glass (5) which contacts with the flat surface when the door glass (5) moves up/down. The door glass run according to any of claims 1 to 4, wherein each of said grooves (4; 4a-4e) is shaped in a form of an inverted triangle in section. The door glass run according to any of claims 1 to 5, wherein said grooves (4; 4a-4e) are mutually-parallel. The door glass run according to any of claims I to 6, wherein said bottom surface (31) of the body portion (30) comprises a material (S; 6; 32) different from that of the body portion (31), which is superior in smooth property and is capable of fusion bonding with the body portion, and said grooves (4a-4e) are formed on said material. The door glass run according to claim 7, further comprising smooth layers (S; 32a) formed on said lips (35, 36), said smooth layers comprising the same material as that of said bottom surface. The door glass run according to claim 8, wherein said smooth layers (S; 32a) cover all areas of outer surfaces of said lips. The door glass run according to claim 3, characterized in that said body portion (30) having a U-shaped section with said opening, and said bottom surface (31) with said flat widthwise-central surface portion, said flat widthwise-central surface portion extending widthwise for covering an area over which an edge of the door glass faces and laterally vibrates when said body portion is attached on the door frame and operatively associated with the door glass. A door glass run adapted to be attached on a door frame (2) of a car door to guide up/down movement of a door glass, comprising: a body portion (30) adapted to be attached on the door frame (2) and having an opening and a bottom surface (31) with which an end of the door glass (5) contacts; lips (35, 36) disposed on opposite ends of the opening of said body portion so as to be in contact with the door glass from opposite surfaces thereof; and a plurality of grooves (4d, 4e) being formed at predetermined intervals in said bottom surface (31), characterised in that a widthwise central portion of said bottom surface (31) of said body portion (30) with which the end of the door glass (5) contacts is made to be a flat surface, and said plurality of grooves (4d, 4e) are extending longitudinally and are formed at predetermined widthwise intervals on each of opposite side portions of said central flat surface portion.

Inventors: ARITAKE MASANORI, OHMORI HITOSHI, YATUDA ATUSHI, ARITAKE, MASANORI, OHMORI, HITOSHI, YATUDA, ATUSHI
Applicants: TOYODA GOSEI KK, TOYODA GOSEI CO., LTD.
Application year: 1998
Main classification: B60J10
IPC codes: B60J10