WO2011007393A1

WO2011007393A1 - Pedal structure

Info

Publication number: WO2011007393A1
Application number: PCT/JP2009/003352
Authority: WO
Inventors: 三浦裕昭; 山本貴広
Original assignee: 株式会社ナンシン
Priority date: 2009-07-16
Filing date: 2009-07-16
Publication date: 2011-01-20
Also published as: CN102470695B; JPWO2011007393A1; CN102470695A; JP4580459B1

Abstract

Disclosed is an improvement to a pedal made of resin which is integrally attached to the rotary shaft of a braking cam to brake a caster. The structure comprises a bearing section that has a shaft hole into which a rotary shaft is inserted, a pedal space having the bearing section approximately in the center and that has a pair of stepped sections extending to the left and right, a pair of pressure surfaces having a top face roughly in the form of an inclined surface wherein the end at the bearing section is positioned lower and the forward end is positioned higher by the stepped sections, a pair of projecting pieces that are separated vertically by a gap and that connect with the shaft hole through a grooved section, the forward end of which is open, an upper and lower pair of holes for screw attachment that pass vertically through the pair of projecting pieces and into which fastening screws are screwed, a shaft hole cover made of a metal material and that is fit into the shaft hole, and a reinforcing member that comprises an upper and lower pair of pieces that protrude as a pair separated vertically and that are inserted along the top and bottom wall surfaces of the grooved section.

Description

Pedal structure

This invention relates to an improvement of a resin pedal that is integrally attached to a rotating shaft provided in a brake mechanism of a caster.

As a mechanism for braking or releasing the caster, a configuration (for example, JP-A-7-266803, JP-A-2009-40291, etc.) operated by rotating a rotating shaft of a cam in a normal direction or a reverse direction is known.
At that time, the pedal for rotating the rotating shaft has a seesaw structure in which the wheel of the caster is braked by depressing one step around the rotating shaft and the braking is released by depressing the other step. ing.
In addition, in a caster system in a bed or the like disclosed in Japanese Patent Laid-Open No. Hei 8-206156, an operation pedal is disclosed for applying an operation force to a brake lock mechanism (including a link mechanism) of the caster.
Since the upper surfaces of the pair of steps for braking and releasing the brakes of these operation pedals are set on substantially the same surface, the upper surface of the stepped step becomes an inclined posture in which the tip side descends when one step is depressed (FIG. 10 ( b)).
Therefore, there is a possibility that the operated foot may slide down from the step inclined downward, and there is a problem that it is difficult to perform a reliable operation.
Also, the pedal needs to be fixed to the rotating shaft that operates the braking cam directly or indirectly via the link mechanism, but when the pedal body is made of resin, it is firmly fixed to the rotating shaft such as metal. difficult.

JP-A-8-206156

The present invention has been made in view of the above circumstances, and a main problem thereof is to provide a caster operating pedal structure capable of reliably transmitting an operating force when the pedal is operated.
Another object of the present invention is to provide a pedal structure that can be firmly fixed to a rotating shaft.

In order to solve the above problems, the present invention provides a resin pedal structure that is integrally attached to a rotating shaft provided in a brake mechanism of a caster.
At least a part of the treading pressure surface portion provided at each step portion of the pedal base having a pair of step portions in which the bearing portion of the rotating shaft is arranged substantially in the center and extends left and right, one for braking and the other for braking release The upper surface is inclined with the side close to the shaft hole of the bearing portion as the low position and the side away from the shaft portion as the high position, and a reinforcing member that clamps the rotating shaft is fitted into the shaft hole, and the reinforcing member is fixed to the pedal base by the fixing means. It is characterized by being fixed.

In the pedal structure of the present invention, the stepping pressure surface portion of the step portion has a substantially inclined surface shape in which the side close to the bearing portion serving as the rotation center is a low position and the opposite side is a high position. Even when one step part is stepped on from a horizontal stand-by posture, the outer surface of the treading pressure surface part does not incline downward, so there is no possibility that the operated foot slips off the step part, and the The braking cam can be operated.
The rotating shaft of the cam is attached to the bearing portion of the resin pedal base via a metal reinforcing member, and the shaft hole cover portion is tightened by screwing a tightening screw into the screw hole of the protruding piece portion. Since the space can be narrowed and the rotation shaft can be clamped, the pedal can be firmly fixed to the rotation shaft.

FIG. 1 is a perspective view of the pedal according to the first embodiment. FIG. 2 is a perspective view of the pedal from the back side. FIG. 3 is a perspective view for explaining an attachment state to the casters. 4A is a front view of the caster, and FIG. 4B is a rear view. 5 is a plan view of the caster. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a bottom view of the caster. FIG. 8 is a perspective view of the reinforcing member. FIG. 9A is a perspective view as viewed from above, and FIG. 9B is a perspective view as viewed from below. FIG. 10A is a side view showing the tilted state of the pedal of the first embodiment, and FIG. 10B is a side view showing the tilted state of the flat pedal.

DESCRIPTION OF SYMBOLS 1 Pedal 2 Pedal base 3 Bearing part 4 Shaft hole 5 Step part 5a Recessed part 5b, 5c Mounting hole 6 Treading pressure part 6A Inclined surface 6a Board | substrate 6b Locking part 6c

Elastic pad

7, 8 Protruding

piece part

7a, 8a Screwing hole Part 11 Reinforcing member 12 Shaft

hole cover parts

13 and 14 Upper and lower piece parts 20 Rotating shaft

According to the present invention, since the stepping pressure surface portion having an inclined surface is provided in the step portion of the synthetic resin pedal, and the rotating shaft is fixed to the bearing portion via the reinforcing member, the reliability of the pedal operation when the caster is braked or released is released. And improved reliability.
Hereinafter, preferred embodiments of the pedal structure of the present invention will be described with reference to the drawings.

[pedal]
The pedal 1 shown in FIGS. 1 to 7 is a resin pedal 1 that is integrally attached to a rotating shaft 20 extending substantially horizontally of a braking cam (not shown) that brakes a caster 21 as shown in FIG.
The pedal 1 includes a pedal base 2 in which a bearing portion 3 is arranged in the center and a pair of step portions 5 are provided on both sides thereof, and a reinforcing member 11 fitted into the shaft hole 4.

[Pedal base]
The pedal base 2 has a bearing portion 3 having a shaft hole 4 into which a rotating shaft 20 for rotationally displacing a cam directly or indirectly via a link mechanism, and a shaft portion 4 at a substantially center, and extends left and right. And a pair of step portions 5 having one as a braking step and the other as a brake releasing step.
In addition, the code | symbol H is a recessed part for weight reduction and material saving.

[Bearing part]
The bearing portion 3 is bulging and extending in a series in the short direction of the pedal base 2 at the approximate center of the pedal base 2 and has a shaft hole 4 having a polygonal cross section at the center.
The shaft hole 4 has a hexagonal cross section in the illustrated example corresponding to the cross section of the rotary shaft 20, opens on one surface of the bearing portion 3, and extends to the front of the other surface (FIG. 7). reference).
The bearing portion 3 is provided with a groove 9 described later on the opening side of the shaft hole 4.

[Step part]
The pair of step portions 5 is formed with a pair of treading pressure surface portions 6 having inclined upper surfaces with the bearing portion 3 side at a low position and the tip end side at a high position.
In the present embodiment, the treading pressure surface portion 6 is fitted and attached to the step portion 5.
For this reason, the step portion 5 has a recess portion 5a formed of a recess into which a separate treading pressure piece portion 6 is fitted, and mounting

holes

5b and 5b ′ formed in the bottom surface of the recess portion 5a.

The

mounting holes

5b and 5b 'are each composed of a small-diameter upper step hole and a concentric large-diameter lower step hole, and a latching step is formed between the upper step hole and the lower step hole. ing.
In the illustrated example, the lower step hole portion of the attachment hole 5b is expanded over the entire circumference, and the step portion 50 for latching is formed in an annular shape, but the lower step hole portion of the attachment hole 5b 'is substantially the same. The stepped portion 50 ′ is widened over a half circumference, and has a shape shown in the figure in a substantially semicircular shape.

[Treading surface]
The treading pressure surface portion 6 is a portion where the foot of the pedal operator comes into contact, and a synthetic resin substrate 6a that fits in the recess 5a with almost no gap, and a pair of members that are integrated with the substrate 6a and hang down from the lower portion thereof. The

stoppers

6b and 6b ′ and the elastic pad 6c having a corrugated cross section fixed to the upper portion of the substrate 6a are formed (see FIGS. 6 and 9).

The

locking portions

6b and 6b ′ include a pair of leg portions 60 that face each other with a claw portion 61 whose tip protrudes outward, and the pair of claw portions 61 are supported by the elastic force of the leg portion 60. Is made to pass through the small diameter upper step hole portion of the

mounting holes

5b and 5b ', and the claw portion 61 is locked to the step portions 50 and 50' by the repulsive force of the leg portion at the lower step hole portion, respectively. ing.

For the attachment structure of the stepping pressure surface portion 6 to the step portion 5, other known detachable connecting structures can be used, and when the pressure pressing surface portion 6 is worn or damaged, it can be replaced.
In the present invention, the treading pressure surface portion 6 may be integrally formed as the upper surface of the step portion 5 without being separated.

The treading pressure surface portion 6 has a lower position on the side close to the shaft hole 4 with respect to a reference line L (see FIG. 4B) that extends linearly along the left and right step portions 5 through the shaft hole 4. The upper surface has an inclined surface 6A that is inclined with the side away from 4 as a high position.

In the present embodiment, the surface of the elastic pad 6c which is the upper surface of the treading pressure surface portion 6 has a corrugated shape in the longitudinal section, but may be a flat surface.
And as for the upper surface of the treading pressure surface part 6, the upper surface on the side close to the bearing portion 3 is set as an inclined surface 6A, and the upper surface on the side away from the bearing portion 3 is set to a substantially horizontal surface 6B.

Therefore, in the case of the illustrated example, the pair of step portions 5 has an upper surface between the bearing portion 3 and the treading pressure surface portion 6 as a substantially horizontal surface 5d, and the following treading pressure surface portion 6 passes through the inclined surface 6A and becomes a substantially horizontal surface 6B. (See FIG. 4).
In the present invention, since at least one part of the upper surface of the treading pressure surface portion 6 is inclined, the entire treading pressure surface portion 6 is inclined, or the upper surface on the side away from the bearing portion 3 is inclined. Also good.

As shown in FIG. 10 (a), the inclined surface 6A on the upper surface of the treading pressure surface portion 6 is configured such that one of the step portions 5 is depressed from the standby posture in which the left and right step portions 5 are at the same position, and the pedal base 2 is rotated. When the caster is rotated to a braking or braking release position about 20 as a center, the inclined surface 6A of the treading pressure surface portion 6 on the stepped-on side is inclined substantially upward or substantially horizontally.
Therefore, the inclined surface 6A of the treading pressure surface portion 6 is preferably set to an angle equal to or greater than the cam rotation angle when the caster is braked or released.

[Projection piece]
Further, on one opening side of the shaft hole 4 of the bearing portion 3 (in the illustrated example, the insertion side of the rotary shaft 20), a pair of projecting piece portions 7 that are connected to the insertion side of the rotary shaft 20 and project outward are provided. 8 are spaced apart from each other via a groove 9 formed in the bearing 3.
The pair of projecting

piece portions

7 and 8 are formed such that the upper projecting piece portion 7 is integrally formed with the bearing portion 3 above the groove portion 9, and the lower projecting piece portion 8 is the bearing portion 3 below the groove portion 9 and the pedal base. 2 (step portion 5).

The projecting

piece portions

7 and 8 are formed so as not to collide with a foot operated by bending the peripheral wall on the projecting tip side into a curved surface.
The groove portion 9 is a groove that communicates with the shaft hole 4 and separates the bearing portion 3 up and down with a gap therebetween. The groove portion 9 is formed in an opening on the insertion side of the rotary shaft 20 of the shaft hole 4 and has a width of This corresponds substantially to the width of upper and

lower pieces

13 and 14 of the reinforcing member 11 described later, and is approximately half the length of the shaft hole 4 in the illustrated example. However, in this invention, the length of the groove is not particularly limited. .

The pair of projecting

pieces

7 and 8 are formed with a pair of upper and

lower screw holes

7a and 8a penetrating vertically on the coaxial line.
The pair of

screw holes

7a and 8a are tightened by tightening a tightening screw 10 from above to bring the upper projecting piece 7 closer to the lower projecting piece 8 so that the groove 9 The width of is designed to narrow.
In the illustrated example, a screw is engraved only in the hole 8a of the lower projecting piece 8, and the tightening screw 10 inserted from the upper projecting piece 7 is tightened.

[Reinforcing member]
A reinforcing member 11 shown in FIG. 8 is fitted into the shaft hole 4 and the groove 9.
The reinforcing member 11 is made of a metal plate, but may be a synthetic resin material having rigidity and elasticity.

The reinforcing member 11 is fitted into the shaft hole 4 and protrudes from the opening 12a of the shaft hole cover portion 12 in parallel with the shaft hole cover portion 12 that is open 12a along the groove portion 9 and protrudes in parallel with the groove portion. 9 and a pair of upper and

lower piece portions

13 and 14 inserted along the upper and lower wall surfaces (the bottom wall surface of the upper protrusion piece 7 and the top wall surface of the lower protrusion piece 8).
The upper and

lower pieces

13 and 14 are provided with

holes

13a and 14a that are in communication with the screw holes 7a and 8a and into which the tightening screw 10 can be inserted.

In the case of the illustrated example, the rotary shaft 20 has a hexagonal cross section, so the shaft hole 4 also has a hexagonal cross section.
By making the cross section of the rotating shaft 20 and the shaft hole 4 into a polygonal cross section or a non-circular cross section, the rotating shaft 20 can be prevented from rotating in the shaft hole 4.

Therefore, by tightening the projecting

piece portions

7 and 8 with the tightening screw 10, the upper and

lower piece portions

13 and 14 are pressed in the approaching direction, the opening 12a is narrowed, and the outer shape of the shaft hole cover portion 12 is reduced. Tightening to the rotating shaft 20 can be strengthened, the resin pedal base 2 can be firmly fixed to the rotating shaft 20 via the reinforcing member 11, and the peripheral wall of the shaft hole 4 made of synthetic resin is damaged. There is nothing to do.

Claims

In the resin pedal structure that is integrally attached to the rotating shaft that operates the braking mechanism of the caster,
A bearing portion having a shaft hole having a substantially polygonal cross section for inserting the rotation shaft;
A pedal base having a pair of step portions which are arranged in a substantially central portion and extend left and right, one for braking and the other for braking release;
Provided in each of the step portions, a side closer to the shaft hole with respect to a reference line extending linearly along the left and right step portions passing through the shaft hole serving as the rotation center, and a side away from the shaft hole. A treading surface portion having at least one upper surface inclined as a high position;
A reinforcing member that is fitted into the shaft hole of the bearing portion and clamps the rotating shaft;
A pedal structure comprising fixing means for fixing the reinforcing member to the pedal base.
A pair of projecting piece parts, in which the pedal base is connected to the rotating shaft insertion side of the bearing part and protrudes outward, and is separated with a gap in the vertical direction through a groove part communicating with the shaft hole and opening at the tip. And a pair of upper and lower screwing holes that allow the pair of protruding pieces to penetrate vertically and allow the pair of protruding pieces to be accessed by screwing of the tightening screws,
The reinforcing member is made of a metal or other rigid plate material, is fitted along the inner wall surface of the shaft hole, and is opened along the groove portion. The shaft hole cover portion has a substantially polygonal cross section. It consists of a pair of upper and lower pieces having holes that are vertically spaced apart from the opening and protrude along a pair of upper and lower wall surfaces of the groove, and that have a hole that communicates with the screw hole and allows insertion of a tightening screw.
Inside the shaft hole, the shaft hole cover part of the reinforcing member is fitted over the rotating shaft, and the tightening screw is passed through the hole part of the projecting piece part and the hole of the upper and lower piece parts and tightened to fix the reinforcing member to the pedal base. The pedal structure according to claim 1.
The step portion has a recess formed in the pedal base and fitting the treading pressure surface portion, and an attachment hole formed in the bottom surface of the recess;
The tread surface portion includes a substrate that fits into the concave portion, a locking portion that protrudes downward from the lower portion of the substrate and engages with the mounting hole, and an elastic pad having a corrugated cross section fixed to the upper portion of the substrate. The pedal structure according to claim 1, wherein:
The rotating shaft and shaft hole are hexagonal in section,
A reinforcing member is a pair of hexagonal folded plate-shaped shaft hole covers that can be fitted into the shaft holes, and a pair of parallel and spaced apart from the opening formed in the middle of one surface of the shaft hole cover The pedal structure according to claim 1, comprising a pair of upper and lower piece portions protruding and inserted along upper and lower wall surfaces of the groove portion.
2. The pedal structure according to claim 1, wherein an inclination angle of an upper surface of the treading pressure surface portion is set to an angle equal to or larger than a rotation angle of the cam when the caster is braked or released.
2. The pedal structure according to claim 1, wherein an upper surface on the side close to the bearing portion of the treading pressure surface portion is set as an inclined surface, and an upper surface on the side away from the bearing portion is set in a substantially horizontal plane.
The pedal base has a recess that fits the treading pressure part, and a mounting hole is provided on the bottom of the recess to hold the locking part on the bottom of the treading pressure part. The treading pressure part can be attached to and removed from the pedal base. The pedal structure according to claim 1, wherein the pedal structure is attached to the pedal structure.