JPH0249955B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to pedals of plastic material for bicycles or the like.

Pedals are known which have a pedal body made of plastic material that rotates around a metal shaft via ball bearings, needle bearings or a telescoping ring.

This type of pedal cannot be expected to be highly reliable because of the large stress that is directly applied to each part of the pedal body and accelerates wear. Additionally, these pedals are relatively expensive due to their construction and assembly time.

The pedal aimed at by the present invention is designed to provide friction by its shape on a corresponding part of a sleeve made of plastic material (molded from a mold rather than from the original) which is duplicatively molded on a metal shaft of standard diameter. A pedal body made of plastic material with a bore is provided, which acts directly on the pedal body and thereby achieves a compromise between the contact pressure caused by the stresses exerted on the pedal and the strength of the plastic material used.

According to another feature of the invention, the complementary mating bearing surfaces of the pedal body bore and the sleeve, when molded,
It is directly formed into a stepped, continuous cylindrical shape that avoids fault-prone forming drafts, preserving a particularly wear-resistant surface layer.

According to another feature of the invention, the pedal body has an inner flange along its bore, which cooperates with two projecting parts formed according to the sleeve and holding the pedal body laterally with a minimum of play. .

According to another feature of the invention, the pedal body can be fixed transversely to the shaft with a sleeve from the end via closure means such as a bushing, a retaining ring or the like.

The invention will now be described in detail using preferred embodiments shown in the drawings as non-limiting examples.

The pedal according to the invention is made of plastic material and is a pedal for a bicycle or the like. This pedal includes a pedal body 1 having a hollow shaft 1a in the longitudinal direction. Both ends of the hollow shaft 1a are supported by a support frame 1
b, and the longitudinal side surfaces of the support frame 1b are reinforced in the longitudinal direction by bent ribs 1c.

The support frame 1b includes a T-shaped outer plate 1d, and the T-shaped outer plate 1
d has end facing slits 1e formed by outer plate members 1f along each support surface and half thereof. The slits 1e are located alternately along each support surface. Via the openings provided on the longitudinal sides of the support frame 1b, a tightening belt for a tow clip fixed in a known manner can be passed through the slot 1e.

The hollow shaft 1a is a completely hollow body, and the pedal body 1
a series of stepped bearing surfaces 1g-1h-1i-1j- arranged with diameter decreasing towards the outside of the
It has 1k-1l-1m. Further, an inner flange portion 1n and a tip chamber 1p are formed at the tip of the hollow shaft 1a. The pedal body 1 can be obtained in one step by molding without additional machining.

A metal shaft 2 of a standard diameter for resisting the deflection of the pedal body 1 due to the force applied to the pedal body 1 consists of a cylindrical support part, and the outer periphery of the cylindrical support part is covered with a sleeve 3 made of plastic material. . The sleeve 3 is fixed in the longitudinal direction via at least one groove 2a formed on the metal shaft 2.
The sleeve 3 is placed over the metal shaft 2 by a duplicative molding method.

The sleeve 3 has an outer diameter that allows the contact pressure with the metal shaft 2 to not exceed a permissible value and that can sufficiently fit the metal shaft to ensure friction. -1i-1j-1k-1l
- a series of stepped bearing surfaces 3a-3b-3c-3d-3 arranged with a diameter decreasing gradually towards the outside of the pedal body 1 to ensure centering to 1 m;
It has e-3f-3g.

The metal shaft 2 includes an overhanging end in addition to the cylindrical support part, and a threaded protrusion 2b to be screwed into the crank and a flange 2c are formed on the overhanging end. The flange 2c has a flat portion 2d for receiving a tightening key.

On the metal shaft 2 on the opposite side of the overhanging end, a sleeve 3 projects from the tip of the metal shaft 2 to form a cylindrical projection 3h. This cylindrical protrusion fits into the inner flange 1n of the hollow shaft 1a. Further, the metal shaft 2 has a bearing surface that restricts movement in the translational direction.

In order to elastically fit the sealing ring 4 into the cylindrical protrusion, a conical groove 3 is formed at the tip of the cylindrical protrusion 3h.
i is provided. The sealing ring 4 includes a cylindrical portion that is fitted onto the cylindrical protrusion 3h, and an outer flange 4a that is integrally formed with the cylindrical portion and abuts the outer surface of the hollow shaft 1a with a frictional force. including. The outer flange 4a has an outer peripheral edge 4b that slightly overlaps the conical outer end of the hollow shaft 1a to ensure sealing performance. A bushing 5 is press-fitted or welded to close the longitudinal opening of the sleeve 3.

In the embodiment shown in FIG. 11, a sleeve 7, also made of plastic, is fitted onto the metal shaft 6 by means of a reproduction molding method. The outer end of the metal shaft 6 protrudes, and this outer end is connected to the flange 1n of the hollow shaft 1a.
a bearing surface 6a that engages with the slit bush 8;
and has. The bush 8 has a protective cover 8a on the outside. The protective cover 8a has a protruding outer edge that slightly overlaps the conical tip of the hollow shaft 1a to ensure sealing. The bush 8 does not need to have a protective cover 8a on the outside.

In the embodiment of FIG. 12, the metal shaft 9 is connected to the hollow shaft 1
It protrudes from the duplicating sleeve 10 so as to fit into the flange 1n of a.
Further, a thread groove is cut in the end portion 9a. A bush 11 is screwed into this thread groove. The bush 11 has an outer end 11b that presses against the conical tip of the hollow shaft 1a to ensure sealing.
It has a front circular groove 11a defined by.

In the embodiment of FIGS. 13 and 14, the metal shaft 1
2, a sleeve 13 formed by a duplication mold protrudes;
Fitting support surface 12a to flange 1n of hollow shaft 1a
form. Groove 12b adjacent to bearing surface 12a
is located facing the other groove it in the opening of the hollow shaft 1a. A pair of openings are formed in the hollow shaft 1a in the transverse direction, and a presser fork 1 is inserted into the openings.
4 branches are fitted. Each branch of the hawk 14 allows the metal shaft 12 and the hollow shaft 1a to fit together.

The hawk 14 has a bent portion 14a bent at a right angle.
The hawk 14 is fixed in the fitted position by pressing the bent portion 14a against the outer periphery of the hollow shaft 1a. The cap 15 is elastically fixed to the tip of the hollow shaft 1a, and at the same time ensures sealing performance and reliably closes the opening.

In the embodiment shown in FIG. 15, the sleeve 17 has a cylindrical portion 17a formed on the outside that protrudes from the tip of the metal shaft 19 and fits into the inner flange 1n of the hollow shaft 1a. The sleeve 17 also has a bearing surface that prevents translational movement of the hollow shaft 1a. The cylindrical portion 17a has a flat surface 17b for fitting into a corresponding recess of the bush 18 and fixing the peripheral edge.
The bush 18 has a longitudinal protrusion 18a whose tip fits into a corresponding longitudinal opening 17c of the sleeve 17.
including. The fastening of the bush 18 is ensured transversely to the corresponding bearing surface of the sleeve 17 by ultrasonic welding.

In either case, the pedal body 1 is provided with a cover 16 made of a flexible material and fixed to the outer periphery of the hollow shaft 1a by a metal fitting on the crank side.

Hereinafter, points to be emphasized regarding the features of the embodiments of the present invention will be described. - The pedal body is manufactured from plastic material.

- No machining of rotating parts.

-Omits normal bearing parts.

-Can be assembled quickly.

The invention is not limited to the specific embodiments or methods of manufacturing each part mentioned by way of example, but includes all modifications.

[Brief explanation of drawings]

1 is a scaled front view of a pedal body according to the invention, FIG. 2 is a side view corresponding to FIG. 1, FIG. 3 is a cross-sectional view taken along the chain line 3--3 in FIG. 1 is a longitudinal sectional view taken along line 4--4 in FIG. 1; FIG. 5 is a partial longitudinal sectional view of the metal shaft to which the sleeve is connected; FIGS. Fig. 8 is a side view corresponding to Fig. 5 shown on an enlarged scale, Fig. 9 is a side sectional view taken along line 9-9 of Fig. 5 shown on an enlarged scale, and Fig. 10 is a completed assembly shown on an enlarged scale. Longitudinal cross-sectional view of the entire rear pedal,
Fig. 11 is a partial vertical sectional view of a pedal with a longitudinal fixing ring fixed by a hook-type elastic fit, Fig. 12 is a partial longitudinal sectional view of a pedal with a longitudinal fixing ring fixed by a screw, and Fig. 13. A partial vertical sectional view of a pedal with a longitudinal fixing plate fixed by a stopper, FIG. 14 is a sectional view taken along line 14-14 in FIG. 13, and FIG. 15 is a lateral fixing plate fixed by ultrasonic welding. FIG. 3 is a partial longitudinal sectional view of a pedal with a bush; 1...Pedal body, 1a...Hollow shaft, 1b...Support frame, 1c...Arm, 1d...T-shaped outer plate, 1e
...Slit, 1f...Outer band, 2...Metal shaft, 3...Sleeve, 4...Sealing ring, 5...
Butsuyuu.

Claims (1)

Claims: 1. A pedal for a bicycle or the like, centered on and free on a corresponding part of a sleeve of plastic material replica molded on a metal shaft of standard diameter. a pedal body made of plastics material having a hollow shaft configured to rotate and further provided with a boring portion for obtaining a frictional bearing surface made of plastics material which can accommodate the pressures exerted on the pedal; and means for sealing and lateral fixing of the pedal body with respect to the hollow shaft. 2. Claim 1, wherein the bearing surfaces of the hollow shaft of the pedal body and the sleeve of the metal shaft are complementary and are directly formed during molding to form a continuous stepped shape. pedal. 3. A patent in which the hollow shaft of the pedal body contains in its boring a flange which cooperates with two projecting parts formed respectively on the fastening means to enable support of the metal shaft on the sleeve and from the sides. A pedal according to claim 1. 4. includes a pedal body forming a hollow shaft connected at its ends to a support frame with longitudinal sides reinforced longitudinally and transversely by shaped arms, for passing the tightening belt of the toe clip; 2. A pedal according to claim 1, wherein a pair of end slits or longitudinal openings are arranged along each side of the support frame. 5. A sleeve of plastic material projects outwardly from the metal shaft for fitting and abutting the flange of the hollow shaft, and a sealing ring fits into the conical extension of said sleeve by the elasticity of its tip shape. , in order to cover the end of the hollow shaft, an end cover is formed by opposing flanges with edges or outer circumferential edges, and a bush is fitted and secured within the longitudinal opening of the sleeve. A pedal according to claim 1. 6 As a variant, the fixing and sealing means for the pedal body consist of a slotted bushing, the shouldered front part of which fits into a groove provided in the end of a metal shaft projecting from a replica molded sleeve. 2. A pedal according to claim 1, wherein the ends of the hollow shaft are all covered in such a way that the bushings are fitted in a resilient manner and are fitted with protective covers. 7 As a variant, the fixing and sealing means of the pedal body consist of a bushing screwed directly through a longitudinal opening onto the threaded end projecting from the metal shaft, said bushing being connected to the end of the hollow shaft. 2. A pedal according to claim 1, further comprising a front groove with a contoured edge for bearing against the pedal. 8 As a variant, the fixing and sealing means of the pedal body can be fitted, on the one hand, via a front circular groove with a circular positioning plane into the outer bearing surface of the projecting part of the sleeve, and on the other hand, via a longitudinal part forming a projection. Claim 1 comprising a bush which is fitted into a corresponding opening formed in the end of the sleeve, the fixing of the bush being carried out vertically with respect to the bearing surface of the assembly by means of ultrasonic welding. Pedals listed.