MOUNTING MEMBER

Abstract: A mounting member is improved in durability, allows an article to be mounted at a desired position of a structure and eliminates the necessity of a special mechanism for preventing a turning motion of a fastening member. The mounting member has a fattened portion (12) formed adjacent each of a pair of transverse crossing portions between flanges and webs thereof for preventing turning movement of a head of a fastening member fitted in a groove defined by the webs and the flanges. If the head of a fastening member is inserted into the groove through an opening between the flanges and then the fastening member is turned by an angle of about 90 degrees around its axis within the groove, the head of the fastening member is fitted with the fattened portions and prevented from turning around its axis.

Description: BACKGROUND OF THE INVENTION This invention relates to a mounting member formed on a structure for mounting an article on the structure. Conventionally, a structure on which an article is to be mounted has formed thereon such a mounting member A as shown in Figs. 6 and 7. The mounting member A shown includes a pair of webs 2 extending downwardly in parallel to each other from a lower surface of the structure 1, and a pair of flanges 3 extending mutually inwardly from and transversely to lower ends of the webs 2 and defining therebetween an opposing opening 3a. It is to be noted that the structure shown in Fig. 6 serves as a floor of a vehicle and a required article is to be mounted on the structure. A groove 4 of a partially cut rectangular cross section is defined by and between the webs 2 and the flanges 3 of the mounting member A. A head 7 of a bolt B for fastening a flange 6 of an article 5 to the mounting member A is fitted in the groove 4, and the bolt B is fastened to the mounting member A by means of a nut 8 tightened on the bolt B. Accordingly, when the nut 8 is tightened onto the bolt B, it is necessary to hold the bolt B from turning around its axis. To this end, the head 7 of the bolt B is normally shaped and dimensioned so that it may be fitted closely in the groove 4. Thus, where the head 7 of the bolt B used has a regular square shape, either a method wherein the head 7 is inserted into the groove 4 from its one end and then slid to a predetermined position of the groove 4 or another method wherein a cutaway portion 9 for admitting the head 7 of the bolt B therethrough is provided at a suitable position of the flanges 3 may be used. However, according to the former method, the head 7 of the bolt B cannot be inserted into the groove 4 if the end portion of the groove 4 is blocked, while according to the latter method, a step for forming the cutaway portion 7 is required and the article 5 cannot be mounted at a position of the cutaway portion 9. In order to resolve such disadvantages as described just above, such a method as illustrated in Fig. 8 has also been devised wherein the head 7 of the bolt B has such a deformed rectangular shape that the width or the dimension of the shorter side thereof may allow the head 7 to be inserted through the opposing opening 3a between the flanges 3 and the head 7 after having been fitted in the groove 4 may be turned by an angle of about 90 degrees around its axis in a direction indicated by an arrow mark within the groove 4 until it is closely fitted in the groove 4. It is self-evident that this method involves a complicated shape of the head 7 of the bolt B, which results in a high production cost of the bolt B. Further, in the case of the mounting member A described above, if the article 5 is secured thereto, the stress at crossing or connecting portions 10 between the flanges 3 and the webs 2 is increased so that where the mounting member A is formed by extrusion molding of a conventionally used aluminum material, a crack C may appear at such a crossing portion 10 depending upon a fastening torque or a condition of a load applied thereto, which will be a significant problem with respect to the mechanical strength of the mounting member A. SUMMARY OF THE INVENTION It is an object of the present invention to provide a mounting member which is improved in durability. It is another object of the invention to provide a mounting member wherein the necessity of provision of a cutaway portion thereon can be eliminated and an article can be mounted at a desired position of a structure by means of a fastening member. It is a further object of the invention to provide a mounting member which eliminates the necessity of a special mechanism for preventing a turning motion of a fastening member. In order to attain the objects described above, according to the present invention, there is provided a mounting member having a pair of webs, a pair of flanges extending inwardly toward each other from and transversely to ends of said webs with an opening defined between inner opposing extremities thereof, said pair of webs and said pair of flanges defining therein a groove which has a width greater than the width of said opening and in which a head of a fastening member is loosely fitted in such a manner as to allow a pivotal motion of said fastening member therein, and a fattened portion formed adjacent each of transverse crossing portions of said flanges to said webs within said groove for preventing turning movement of the head of the fastening member fitted in said groove. Accordingly, if the head of a fastening member is inserted into the groove through the opening between the flanges and then the fastening member is turned by an angle of about 90 degrees around its axis within the groove, the head of the fastening member is fitted with the fattened portions formed adjacent the crossing portions between the webs and the flanges. In this condition, a turning motion of the head of the fastening member is prevented by the fattened portions. Besides, the fattened portions function as a reinforcement in mechanical strength to the crossing portions between the webs and the flanges against a bending moment applied to the flanges when an article is secured to a structure by means of a fastening member. The above and other objects, features and advantages of the present invention will become apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a vertical sectional view of a mounting member according to an embodiment of the present invention; Fig. 2 is a sectional view taken along line II-II of Fig. 1; Figs. 3a and 3b are a front elevational view and a side elevational view, respectively, of a fastening member for use with the mounting member of Fig. 1; Fig. 4 is a vertical sectional view of a mounting member according to another embodiment of the invention; Figs. 5a and 5b are a front elevational view and a side elevational view, respectively, of a fastening member for use with the mounting member of Fig. 4; Fig. 6 is an illustrative view of a conventional arrangement of an article mounting structure and an article mounted on the structure; Fig. 7 is a vertical sectional view of a conventional mounting member; Fig. 8 is an illustrative view showing a relationship between the mounting member of Fig. 7 and a fastening member; and Fig. 9 is a vertical sectional, diagrammatic view illustrating a bending moment applied to a flange of the mounting member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first to Figs. 1 and 2, there is shown a mounting member according to a first embodiment of the present invention. It is to be noted that, in Figs. 1 and 2 and also in Fig. 3, like elements or components are denoted by like reference numerals or symbols to those of the conventional arrangement shown in Figs. 6 to 8. A mounting member generally denoted at A is formed on a structure 1 and includes a pair of webs 2 and a pair of flanges 3 extending mutually inwardly from and transversely to lower ends of the webs 2. An opposing opening 3a is defined between the flanges 3, and a groove 4 is defined by and between the pair of webs 2 and the pair of flanges 3. A fastening member may be, for example, a bolt B which has a rectangular head as shown in Figs. 3a and 3b. The bolt B shown has a narrower head portion 11 presenting a dimension of a shorter side or a width of the rectangular shape of the head of the bolt B, and a wider head portion 13 presenting a dimension of a longer side or a length of the rectangular shape. The narrower head portion 11 of the head of the bolt B is dimensioned so as to allow the head of the bolt B to be inserted into the groove 4 through the opposing opening 3a between the flanges 3. Meanwhile, fattened portions 12 in the form of steps or shoulders are formed in an opposing relationship to each other adjacent and along transverse crossing portions 10 of the flanges 3 to the webs 2 by increasing the thickness of the flanges 3 inwardly of the groove 4 as seen in Fig. 1. The distance 12b between opposing faces and the height 12a of the fattened portions 12 are dimensioned so that the wider head portion 13 of the bolt B may be fitted between the fattened portions but may be prevented from turning around its axis by the fattened portions 12 while the height of the groove 4 above the fattened portions 12 in Fig. 1 is dimensioned so as to allow a turning motion of the wider head portion 13 of the bolt B around its axis within the groove 4 above the fattened portions 12. Accordingly, if the narrower head portion 11 of the bolt B is inserted into the groove 4 through the opposing opening 3a between the flanges 3 of the mounting member A and then the bolt B is turned by an angle of about 90 degrees in a direction of an arrow mark (refer to Fig. 2) around its axis, the wider head portion 13 is dropped into a spacing and fitted between the opposing faces of the fattened portions 12 formed on the flanges 3. Consequently, the wider head portion 13 of the bolt B is prevented from turning around its axis by the fattened portions 12. Accordingly, if a hole formed in a flange 6 of an article 5 is fitted on the bolt B and then a nut 8 is tightened, the article 5 will be secured to the mounting member A of the structure 1. Accordingly, the tendency of the bending moment applied to the flanges 3 will be such as shown in Fig. 9, and the value M2 of the bending moment here is smaller than its value M1 where the fattened portions 12 are not provided, which means that the mechanical strength is increased by the fattened portions 12. Referring now to Fig. 4, there is shown a mounting member according to another embodiment of the present invention. Also in Fig. 4 and in Fig. 5, like elements or components are denoted by like reference numerals or symbols to those of the arrangement shown in Figs. 1 to 3 and of the conventional arrangement shown in Figs. 6 to 9. In the embodiment shown in Fig. 4, fattened portions 14 are formed by tapering or sloping flanges 3 of a mounting member A such that the flanges 3 may gradually increase in thickness from inner opposing extremities thereof between which an opposing opening 3a is defined toward crossing portions 10 between the flanges 3 and webs 2 of the mounting member A. Meanwhile, a bolt B for use with the mounting member A has a rectangular head having a narrower head portion 11 and a wider head portion 13 which has a pair of inclined faces 15 formed at lower portions contiguous to a pair of end faces thereof as shown in Figs. 5a and 5b. The slope of tapered upper faces of the fattened portions 14 and the slope of the inclined faces 15 of the head of the bolt B are complementary to each other so that they may contact suitably with each other while they function to prevent turning movement of the bolt B around its axis if a nut 8 is tightened. Having now fully described the invention, it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto without departing from the spirit and scope of the invention as set forth herein.

Claims: 1. A mounting member having a pair of webs, a pair of flanges extending inwardly toward each other from and transversely to ends of said webs with an opening defined between inner opposing extremities thereof, said pair of webs and said pair of flanges defining therein a groove which has a width greater than the width of said opening and in which a head of a fastening member is loosely fitted in such a manner as to allow a pivotal motion of said fastening member therein, and a fattened portion formed adjacent each of transverse crossing portions of said flanges to said webs within said groove for preventing turning movement of the head of the fastening member fitted in said groove. 2. A mounting member according to claim 1, wherein the fattened portions are each formed as a step adjacent each of said transverse crossing portions of said flanges to said webs. 3. A mounting member according to claim 1, wherein the fattened portions are formed as slopes on said flanges which are inclined such that the thickness of said flanges may gradually increase from said opposing extremities to said transverse crossing portions of said flanges to said webs.

Inventors: ISHIDA, TAKESHI, KAWAZOE, KAZUHIKO
Applicants: KAWASAKI JUKOGYO KABUSHIKI KAISHA
Application year: 1987
Main classification: F16B21
IPC codes: F16B37, F16B35