JP2009006964A - Low-floor vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve appearance of a step floor in a low-floor vehicle. <P>SOLUTION: In the low-floor vehicle wherein a body frame 11, a steering wheel 29 supported by the body frame 11, a seat 46 for seating an occupant, and a step floor 49 arranged between the steering wheel 29 and the seat 46, allowing the occupant to place his or her feet are provided, and the step floor 49 is mounted to the body frame 11 through fastening members 68, mounting reference holes 75L, 75R are provided in the front part of the step floor 49, and mounting holes 76L, 76R opened in a face perpendicular to the mounting reference holes 75L, 75R are provided in the rear part of the step floor 49. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a low-floor type vehicle including a step floor on which a passenger places his / her foot.

A low-floor type vehicle is known that includes a step floor on which a rider places his / her feet on the bottom between a front wheel and a rear wheel (see, for example, Patent Document 1).
Japanese Patent Publication No. 5-5712 (Fig. 3)

  In FIG. 3 of Patent Document 1, a scooter type motorcycle has a frame 6 (the reference sign is the same as that of the same publication; the same applies hereinafter) and a foot on which the occupant mounts his / her foot. A mounting plate 5 is provided.

  The footrest plate 5 is a member made of synthetic resin. A round hole is formed in the front part of the upper surface, and a long hole is formed in the rear part of the upper surface. A fastening member is inserted through these round holes, and is fixed to the frame 6 side via the bracket 7 and the fastening member.

  When the footrest plate 5 is attached to the frame 6, the fastening member is inserted into the round hole to fix the front part to the frame 6, and the fastening member is inserted to the elongated hole to fix the rear part to the frame 6. At this time, by using a long hole formed in the rear portion, a molding error of the footrest plate 5 is absorbed at the time of attachment.

  The footrest plate 5 (hereinafter also referred to as “step floor 5”) is a resin molded product, and some errors may occur in the molded product. In particular, when the step floor 5 is formed long in the front-rear direction, the pitch error between the front reference hole and the rear long hole tends to increase, and this pitch error is absorbed into the frame 6. A sufficiently long slot is required to enable attachment.

  If it is a round hole, it can be closed with the head of the bolt, but a long hole with a long diameter cannot be closed with the head of the bolt. As a result, the hole part of the long hole was exposed and there existed a subject that the external appearance property of a step floor fell.

  An object of the present invention is to improve the appearance of a step floor in a low floor type vehicle.

  According to a first aspect of the present invention, there is provided a vehicle body frame, a steering wheel supported by the vehicle body frame and a seat on which an occupant sits, and a step floor provided between the steering handle and the seat on which the occupant places his / her foot. In a low-floor type vehicle that is provided and this step floor is attached to the vehicle body frame via a fastening member, the front portion of the step floor has a round hole shape and is an attachment reference that serves as a reference for the attachment position to the vehicle body frame. There is a hole, and the rear part of the step floor has a round hole shape and a mounting hole that is drilled in a plane perpendicular to the mounting reference hole. The amount of tightening of the tightening member to this mounting hole is adjusted. Thus, an error between the step floor and the body frame is absorbed, and the step floor can be attached to the body frame.

  The invention according to claim 2 is characterized in that the attachment reference hole and the attachment hole are provided in a projecting piece protruding from below the step floor, and are fastened and fixed from the side and the rear of the step floor in the vehicle traveling direction. And

  The invention according to claim 3 is characterized in that the lower part of the step floor is covered with a cover member, and this cover member is fixed to the vehicle body frame by the fastening member together with the protruding piece.

  According to a fourth aspect of the present invention, a passenger step on which a passenger places his / her foot is integrally formed at the rear portion of the step floor, and such a step floor is attached to the body frame by a fastening member from the rear of the vehicle. It is characterized by being fastened and fixed.

  In the invention which concerns on Claim 5, while the front part of a step floor is supported by the step floor support frame provided in the vehicle body frame, the passenger footrest on which a passenger mounts a foot supports a seat. It is supported by another passenger footrest support frame provided by being stretched over the seat frame and the step floor support frame.

  In the invention according to claim 1, the front part of the reference step floor is attached to the vehicle body frame using the attachment reference hole, and the rear part of the step floor is attached to the surface orthogonal to the attachment reference hole. Tightened to the body frame.

  The mounting reference hole and the mounting hole are arranged in a direction orthogonal to each other, and the amount of tightening to the mounting hole is determined by shifting the front mounting reference hole and the rear mounting hole caused by molding errors in the step floor in the front-rear direction. Because it can be absorbed by adjusting, the step floor is attached to the body frame by absorbing the molding error of the step floor without using the mounting holes that are arranged in the step floor and formed in a long hole shape as in the past. be able to.

By using a round mounting hole, the area required for the mounting hole can be saved on the step floor. Since the mounting hole area can be reduced, design constraints are reduced.
Therefore, the degree of freedom in designing the step floor can be increased.
In addition, by making the mounting hole round, the groove of the hole is not exposed, so that the appearance of the step floor can be improved.

  In the invention according to claim 2, the step floor is fastened and fixed to the vehicle body frame from the side and rear of the step floor via the fastening member. Since the heads of the fastening members are not exposed on the upper and front surfaces of the step floor, it is possible to suppress a decrease in the appearance of the step floor.

  In the invention which concerns on Claim 3, the step floor is being fixed to the vehicle body frame with the fastening member with the cover member. Since the cover member is fastened and fixed to the vehicle body frame using the fastening member for fixing the step floor, the number of fastening members can be reduced.

  In the invention according to claim 4, since the step floor is fastened and fixed to the vehicle body frame by the fastening member from the rear of the vehicle, the number of fastening members arranged on the side surface of the vehicle can be reduced. In addition, the fastening member can be made inconspicuous, and the appearance of the step floor can be further enhanced.

In the invention according to claim 5, the front portion of the step floor is supported by a step floor support frame provided on the vehicle body frame, and the passenger footrest is spanned between the seat frame and the step floor support frame. It is supported by another passenger footrest support frame.
By supporting the front part of the step floor and the passenger footrest with different dedicated frame members, the support strength of the step floor and the passenger footrest can be increased.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In the figure, “front”, “rear”, “left”, “right”, “upper”, and “lower” indicate directions viewed from the driver. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a left side view of a low-floor type vehicle according to the present invention. A motorcycle 10 as a low-floor type vehicle includes a vehicle body frame 11 via a link mechanism 14 including a pivot shaft 12 at the rear part of the vehicle body frame 11. The power unit 15 is swingably attached to the vehicle.

  The power unit 15 includes an engine 16 as a drive source and a transmission case 17 provided behind the engine 16. The transmission case 17 incorporates a belt-type continuously variable transmission 18 that transmits the driving force of the engine 16 to the rear wheels 19. The transmission case 17 is swingably provided at the rear end of the vehicle body frame 11 so that the power of the engine 16 is transmitted to the rear wheel 19.

The vehicle body frame 11 includes a head pipe 21, a down frame 22 attached to the head pipe 21 and extending obliquely rearward, and then extending substantially horizontally rearward, and a cross member 23 attached to a rear end portion of the down frame 22. The left and right seat frames 24L and 24R raised obliquely rearward from the cross member 23 are the main components.
Here, the main frame 25 includes a down frame 22, a cross member 23, and left and right seat frames 24L and 24R.

In the motorcycle 10, a front fork 26 is attached to the head pipe 21 so as to be steerable, a front wheel 28 is attached to the lower end of the front fork 26, and a steering handle 29 is attached to the upper portion of the front fork 26.
A rear wheel 19 is attached to the rear end of the power unit 15 that also serves as a rear swing arm, and a rear cushion unit 31 is suspended between the rear portion of the power unit 15 and the left seat frame 24L.

  The link mechanism 14 interposed between the power unit 15 and the cross member 23 includes a support shaft 32 provided in the vicinity of the cross member 23, a link member 33 extending rearward from the support shaft 32, and the link member 33. And a pivot shaft 12 provided at the rear end.

An intake device 38 and an exhaust device 39 are connected to the cylinder block 37 of the engine 16 constituting the front portion of the power unit 15.
The intake device 38 includes an air cleaner 41 and a fuel supply device 42 connected to the air cleaner 41 via a connecting member 40.
The exhaust device 39 includes an exhaust pipe 43 connected to the engine 16 and extending rearward, and a silencer 44 connected to the exhaust pipe 43 and extended rearward.

  The seat frames 24L and 24R are provided with a storage box 45 that opens upward, a seat 46 on which an occupant sits is provided above the storage box 45, and a fuel tank 47 is disposed behind the storage box 45. The seat 46 is attached from above the storage box 45 and the fuel tank 47 so as to be openable and closable.

  48 is a step floor support frame that supports a step floor 49 described later, 51 is a passenger footrest support frame, 53 is a grab rail, 54 is a front brake unit, 55 is a front fender, 56 is a cowl member, 57 is a rear fender, 58 Is a side stand.

  That is, the motorcycle 10 as a low-floor type vehicle is provided between the steering handle 29 and the seat 46, the body frame 11, the steering handle 29 supported by the body frame 11 and the seat 46 on which the occupant sits. And a step floor 49 on which a passenger places his / her foot.

FIG. 2 is a plan view for explaining the mounting structure of the step floor and the cover member to the vehicle body frame according to the present invention, which will be described with reference to FIG.
The vehicle body frame 11 has a down frame 22, a cross member 23 attached horizontally to the rear end portion of the down frame 22, and side surfaces 23 s and 23 s at both ends of the cross member 23. Left and right seat frames 24L and 24R, left and right step floor support frames 48L and 48R that extend diagonally downward and outward from the left and right from the middle of the down frame 22, and then extend diagonally rearward to support the step floor 49, Are provided between the rear portions of the step floor support frames 48L and 48R and the seat frames 24L and 24R.

  Support members 59L and 59R extend from the cross member 23 toward the left and right outwards, and these support members 59L and 59R are connected to intermediate portions of the left and right step floor support frames 48L and 48R, respectively. That is, the left and right step floor support frames 48L and 48R are supported by these support members 59L and 59R.

  In the figure, reference numeral 61 denotes a cross frame that supports a spanning storage box (reference numeral 45 in FIG. 1) between the left and right seat frames 24L and 24R, and 62 denotes a seat cross frame that supports the seat 46.

Hereinafter, a structure for attaching the step floor 49 and the cover member 63 to the vehicle body frame 11 will be described in detail. The cover member 63 is a member that covers the step floor 49 from below.
Front mounting brackets 64L and 64R for attaching the step floor 49 and the cover member 63 to the vehicle body frame 11 side are provided at the front portions of the left and right step floor support frames 48L and 48R. Intermediate mounting brackets 65L and 65R are provided at the intermediate portion of 48R. The front mounting brackets 64L and 64R and the intermediate mounting brackets 65L and 65R are formed in a U shape in plan view, and the U-shaped open side is mounted toward the inside of the vehicle.

  Further, rear mounting brackets 66 </ b> L and 66 </ b> R are provided at the rear portion of the step floor 49, which are formed in a substantially U shape behind the vehicle and attach the step floor 49 and the cover member 63 to the vehicle body frame 11 side. The rear mounting brackets 66L and 66R are formed in a U shape in plan view, and the open side of the U shape is mounted toward the front of the vehicle.

Note that passenger steps 67 </ b> L and 67 </ b> R on which the passenger places his / her feet are integrally formed at the rear portion of the step floor 49.
The step floor 49 and the cover member 63 are attached to the mounting brackets 64L to 66L and 64R to 66R provided on the vehicle body frame 11 through fastening members 68 (... indicates a plurality, the same applies hereinafter). ing.
69L and 69R are occupant footrest surfaces which are provided on the upper surface of the step floor 49 and on which the occupants place their feet, and 70L and 70R are passenger footrests on which the occupants place their feet.

FIG. 3 is a side view of the step floor according to the present invention, and FIG. 4 is a view taken in the direction of arrow 4 in FIG. Hereinafter, description will be given with reference to FIGS.
On the step floor 49, front projecting pieces 71L and 71R (only the reference numeral 71L on the front side of the figure is shown) projecting downward from the lower front part, and intermediate projecting pieces 72L and 72R projecting downward from the lower intermediate part. (Only the reference numeral 72L on the front side of the figure is shown) and rear projecting pieces 73L and 73R (only the reference numeral 73L on the front side of the figure is shown) projecting downward from the lower rear part.
The surfaces of the front projecting pieces 71L and 71R and the surfaces of the intermediate projecting pieces 72L and 72R are arranged outside the vehicle, and the surfaces of the rear projecting pieces 73L and 73R are arranged on the rear side of the vehicle.

  The front protrusions 71L and 71R provided at the front part of the step floor 49 have a round hole shape, and reference mounting holes 75L and 75R (reference numeral 75L on the front side in the figure) that serve as reference positions for mounting to the vehicle body frame 11 are shown. ), And the rear projecting pieces 73L and 73R provided at the rear portion of the step floor 49 have round holes and mounting holes 76L and 76R (which are formed in a surface 88 orthogonal to the mounting reference holes 75L and 75R). The intermediate protrusions 72L and 72R, which are also provided in the intermediate portion, have a round hole shape and are formed in the same direction as the attachment reference holes 75L and 75R. Holes 77L and 77R (only the reference numeral 77L on the front side of the figure is shown) are provided.

  That is, the attachment reference holes 75L and 75R, the attachment holes 76L and 76R, and the other attachment holes 77L and 77R are opened in the projecting pieces 71L to 73L and 71R to 73R protruding from below the step floor 49.

Passenger steps 67 </ b> L and 67 </ b> R on which the passenger places his / her feet are integrally formed at the rear portion of the step floor 49.
By providing the mounting holes 76L and 76R in the rear protrusions 73L and 73R, the vehicle body frame 11 is fastened and fixed from the rear of the vehicle by a fastening member (see reference numeral 68 in FIG. 2).

  FIG. 5 is a side view of the cover member provided in the low floor type vehicle according to the present invention, and the front portion of the cover member 63 abuts the head of the fastening member (reference numeral 68 in FIG. 2) at the time of fastening. Seat portions 79 are provided (only the front side reference numeral 79 is shown), and front mounting holes 81L and 81R (only the front side reference sign 81L are shown) are provided on these seats 79. Is provided. Similarly, a seat 79... And intermediate mounting holes 82 </ b> L and 82 </ b> R (only the front side reference numeral 82 </ b> L is shown) are provided in the intermediate part of the cover member 63. 84 is a step opening through which a side stand (reference numeral 58 in FIG. 1) passes.

6 is a sectional view taken along line 6-6 in FIG. 2, and FIG. 7 is a sectional view taken along line 7-7 in FIG. Hereinafter, a description will be given with reference to FIGS.
The step floor front mounting structure is such that the front projecting piece 71L is applied to the inner surface of the front mounting bracket 64L, the application surface 86 of the cover member 63 is applied to the outer surface of the front mounting bracket 64L, the front mounting bracket 64L, the front projecting piece 71L, and The cover member 63 is fixed by a fastening member 68.

  Specifically, the mounting reference hole 75L of the front projecting piece 71L is aligned with the fixing hole 87 provided in the front mounting bracket 64L provided for the vehicle body frame 11, and the front mounting hole 81L of the cover member 63 is aligned and fitted to the front projecting piece 71L. By tightening the fastening member 68 from the outside of the vehicle toward the clip 85, the front projecting piece 71L, the front mounting bracket 64L, and the cover member are provided between the head of the fastening member 68 and the clip hole 85h provided in the clip 85. 63 is integrated.

A lower portion of the step floor 49 is covered with a cover member 63, and the cover member 63 is fixed to a front mounting bracket 64 </ b> L provided on the vehicle body frame 11 by a fastening member 68.
By fixing the cover member 63 to the vehicle body frame 11 using the fastening member 68 that fixes the step floor 49, the number of parts can be reduced.

  By fixing the step floor 49 and the cover member 63 together with the front mounting bracket 64L extending from the step floor support frame 48L, the positioning accuracy between the step floor support frame 48L and the mounting portion of the step floor 49 is improved. The suitability of the cover member 63 is also improved.

  Further, in the front projecting piece 71L of the step floor 49, the upper part of the front mounting bracket 64L protrudes wider than the lower part when viewed from the side, and the lower surfaces 91, 91 of the protruding parts are the front mounting bracket 64L. It is possible to support the load received by the step floor 49 and to restrict downward movement.

  Furthermore, on the inner side of the front mounting bracket 64L in the vehicle width direction, a projecting piece rib / floor support portion 90 provided on the step floor 49 and reinforcing the front projecting piece 71L is disposed. The support portion 90 is placed on the upper surface of the step floor support frame 48L, thereby supporting the load of the step floor 49 and regulating its position.

  Note that the movement of the step floor 4 is restricted by the fastening member 68 with respect to the movement of the step floor 4 to rise upward. In this way, by fixing the step floor 49 to the step floor support frame 48L, it is possible to suppress vertical movement during travel, to suppress vibration of the step floor 49, and to reduce vibration noise from the step floor 49. it can.

  FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 2, and the step floor intermediate mounting structure is basically the same as the step floor 49 front mounting structure described above. That is, the fixing hole 87 provided in the intermediate mounting bracket 65L is aligned with another mounting hole 77L provided in the intermediate projecting piece 72L, and the intermediate mounting hole 82L of the cover member 63 is aligned and tightened by the tightening member 68.

FIG. 9 is a cross-sectional view taken along line 9-9 in FIG.
In (a), the mounting structure of the rear part of the step floor is such that a rear projecting piece 73L extends downward from the lower surface 49k of the step floor 49 to the rear mounting bracket 66L provided on the body frame 11, and the rear projecting piece 73L is provided below. A clip 85 having a U-shaped cross section is fitted from the rear, and the projecting piece 73L after fitting the clip 85 is aligned from the front of the vehicle, the cover member 63 is aligned from the rear of the vehicle, and the fastening member 68 is inserted from the rear. It is tightened between the provided clip holes 85h.

That is, the lower portion of the step floor 49 is covered with the cover member 63, and the cover member 63 is fixed to the vehicle body frame 11 side by the fastening member 68 together with the rear projecting piece 73L.
By fixing the cover member 63 on the vehicle body frame 11 side using the fastening member 68 that fixes the step floor 49, the number of parts can be reduced.
Although the attachment structure on the left side of the step floor has been described with reference to FIGS. 6 to 9, the attachment structure on the right side of the step floor has the same structure and action, and the description thereof will be omitted.

The operation of the low floor type vehicle described above will be described next.
In (b), the step floor 49 is a resin molded part, and the error between the mounting reference hole (reference numeral 75L in FIG. 6) provided in the front and the mounting hole 76L provided in the rear is caused during molding. Thus, the case where the position of the rear projecting piece 73L is shifted forward of the vehicle with respect to the predetermined position will be described.

  In this case, by reducing the tightening amount of the tightening member 68 in the mounting hole 76L, an error between the step floor 49 and the vehicle body frame 11 side is absorbed, and a predetermined position on the vehicle body frame 11 side is obtained. The step floor 49 can be attached.

  In consideration of the case where the position of the rear projecting piece 73L deviates from the predetermined position toward the rear of the vehicle, a certain amount of space is provided between the outer surface 88 of the rear projecting piece 73L and the inner surface 89 of the rear mounting bracket 66L at the predetermined position. It is desirable to provide

  Referring also to FIG. 6, after fixing the front portion of the step floor 49 serving as a reference to the vehicle body frame 11 using the attachment reference hole 75L, the rear portion of the step floor 49 is disposed on a surface 88 orthogonal to the attachment reference hole 75L. The fastening member 68 is tightened in the mounting hole 76L.

  The mounting reference hole 75L and the mounting hole 76L are arranged so as to be orthogonal to each other, and the amount of tightening to the mounting hole 76L is adjusted so that the mounting hole is formed on the step floor 49 and formed into a long hole shape as in the past. Without using the step floor 49, it is possible to attach the step floor 49 to the vehicle body frame 11 by absorbing errors between the step floor 49 and the vehicle body frame 11 including the molding error of the step floor 49.

By ending the mounting hole 76L with a round hole, the area required for the mounting hole 76L in the step floor 49 can be saved. Since the area of the mounting hole 76L can be reduced, design constraints are reduced. Accordingly, the degree of freedom in designing the step floor 49 can be increased.
Further, by making the mounting hole 76L round, the hole groove is not exposed, so that the appearance of the step floor 49 can be improved.
Note that the right-side mounting structure is the same as the left-side mounting structure, and a description thereof will be omitted.

Referring also to FIG. 2, the attachment reference holes 75L and 75R and the attachment holes 76L and 76R are provided on the projecting pieces 71L to 73L and 71R to 73R protruding from the lower side of the step floor 49, and on the side of the step floor 49 Fastened and fixed from the rear and rear.
Since the heads of the fastening members 68... Are not exposed on the upper surface of the step floor 49, it is possible to suppress deterioration in the appearance of the step floor 49.

  Passenger steps 67L and 67R on which the passenger places his / her feet are integrally formed on the rear portion of the step floor 49. Such a step floor 49 is formed from the rear of the vehicle by the fastening members 68 and 68 by the body frame 11. It is fastened to the fastening.

Passenger steps 67L and 67R on which the passenger places his / her feet are integrally formed on the rear portion of the step floor 49, so that the passenger steps 67L and 67R and the passenger steps 67L and 67R are mounted on the vehicle body. A dedicated fastening member for fixing to the frame 11 can be omitted.
By integrating the passenger steps 67L and 67R and the fastening members 68 and 68 into the step floor 49, an increase in the number of parts can be suppressed.

In claim 1, the cover member disposed below the step floor may be fixed to the vehicle body frame by a different fastening member. Or you may fix to other members, such as a step floor, via another fastening member.
The passenger step that may be provided at the rear of the step floor may be a component independent of the step floor.

  The present invention is suitable for a step floor provided in a low floor type vehicle.

It is a left view of the low floor type vehicle concerning the present invention. It is a top view explaining the attachment structure of the step floor and cover member to the vehicle body frame which concerns on this invention. It is a side view of the step floor which concerns on this invention. FIG. 4 is a view taken along arrow 4 in FIG. 3. It is a side view of the cover member with which the low floor type vehicle concerning the present invention is equipped. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 2. FIG. 9 is a sectional view taken along line 9-9 in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Body frame, 29 ... Steering handle, 46 ... Seat, 48L, 48R ... Step floor support frame, 49 ... Step floor, 51L, 51R ... Passenger footrest support frame, 63 ... Cover member, 67L, 67R ... Passenger Step: 68 ... Fastening member, 70L, 70R ... Passenger footrest, 75L, 75R ... Mounting reference hole, 76L, 76R ... Mounting hole, 71L, 71R, 72L, 72R, 73L, 73R ... Projection piece.

Claims (5)

A vehicle body frame; a steering wheel supported by the vehicle body frame; a seat on which an occupant sits; and a step floor provided between the steering handle and the seat on which the occupant rests a foot. In a low floor type vehicle that is attached to the body frame via a fastening member,
The front portion of the step floor has a round hole shape and is provided with an attachment reference hole that serves as an attachment position reference to the body frame,
The rear portion of the step floor has a round hole shape, and is provided with a mounting hole opened in a plane orthogonal to the mounting reference hole,
By adjusting the tightening amount of the tightening member in the mounting hole, it is possible to absorb an error between the step floor and the vehicle body frame and to attach the step floor to the vehicle body frame. A low-floor type vehicle.   The mounting reference hole and the mounting hole are provided on a projecting piece protruding from below the step floor, and are fastened and fixed from the side and rear of the step floor in the vehicle traveling direction. 1. A low floor type vehicle according to 1.   The low floor type vehicle according to claim 2, wherein a lower part of the step floor is covered with a cover member, and the cover member is fixed to the vehicle body frame by the fastening member together with the projecting piece.   A passenger step on which a passenger places his / her feet is integrally formed at the rear portion of the step floor, and such a step floor is fastened and fixed to the body frame by the fastening member from the rear of the vehicle. The low floor type vehicle according to claim 1, 2, or 3.   The front portion of the step floor is supported by a step floor support frame provided on the vehicle body frame, and a passenger footrest on which a passenger places his / her foot is a seat frame that supports the seat, The low-floor type vehicle according to claim 4, wherein the low-floor type vehicle is supported by another passenger footrest support frame provided so as to hang over the step floor support frame.

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