Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
1999-12-08
2002-09-17
Hannon, Thomas R. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
C384S058000, C384S543000
Reexamination Certificate
active
06450689
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a roller which is exposed to a very heavy load, and is required to have a suitable elastic force and an abrasion resistance and is structured so as to mount a tire for high speed rotation and a heavy load such as in an escalator, a moving walkway and the like, in which a high level of safety is required, more particularly a roller mounted so that the tire and the bearing are not raced even when the heavy load is applied during starting of the rotation and during a sudden stop, and a method of producing the same.
2. Description of the Related Art
The conventional roller used for a rotating portion which rotates at a high speed, is exposed to a heavy load, and is required to have a suitable elastic force and an abrasion resistance and requires a level of safety of the highest priority for use, such as transfer rollers, elevators, guide rollers, escalators, moving walks and the like with the mounting of a synthetic resin tire. The roller of this kind is structured such that a synthetic resin tire is integrally adhered to a smooth outer peripheral surface of an outer race in the bearing. Further, the tire provided in this kind of bearing is required an abrasion resistance and a suitable elastic force together with a resistance against a high speed rotation and a heavy load. The roller structured such that the synthetic resin tire used in the rotating portion in which a safety is required in the highest priority given is mounted to the bearing and is formed in such a manner that the tire adhered to the outer race of the bearing in a surrounding manner is formed in two layers, a tire outer peripheral portion that is made of a soft synthetic resin to meet a requirement of the abrasion resistance and the elastic force and a tire base portion directly adhered to the outer race of the bearing is made of a hard synthetic resin to bear a resistance against the high speed rotation and the heavy load. It is suggested that a roller structured in such manner that the synthetic resin tire is integrally adhered to the bearing in a surrounding manner is mounted to the bearing and is constituted by hard and soft, two layer synthetic resin tire, and a method of producing the same.
Conventionally, in this kind of roller, structured such that the synthetic resin tire is adhered to the outer race of the bearing, the synthetic resin tire used as the tire is integrally adhered to the outer race of the bearing in a surrounding manner, which is used as elevators, escalators, transfer rollers, guide rollers, the moving walk and the like, and rotates at a high speed, is exposed to a heavy load, is used under a very severe condition, is required to have a suitable elastic force and an abrasion resistance in accordance with a usage, and is required to have a safety with the highest priority. Accordingly, in order to obtain a stronger adhesion, it is suggested the structure be made such that the outer race of the bearing and the synthetic resin tire are integrally bridge welded by cooling and hardening the synthetic resin temporarily and thermally dissolved on an outer peripheral surface of the outer race in place of simply bonding them by applying an adhesive material.
Further, in order that the tire adhered to the outer peripheral surface of the outer race in the bearing is integrally adhered to the outer race of the bearing in a stronger manner, there is suggested a roller structured such that the tire is constituted by two layers comprising a soft synthetic resin and a hard synthetic resin, an inner tire made of the hard synthetic resin is directly adhered to the outer peripheral surface of the outer race in the bearing so as to obtain a stronger adhesion force, and an outer tire made of the soft synthetic resin is adhered in such a manner as to overlap with the hard synthetic resin inner tire, whereby the tire having two layers is adhered to the outer peripheral surface of the outer race of the bearing in a stronger manner.
Further, in the roller to which this kind of synthetic resin tire is mounted, in order to integrally adhere the synthetic resin tire having the hard and soft two layers to the outer race of the bearing, this has been produced by a method of integrally providing the soft resin tire outer peripheral portion on the outer peripheral surface of the hard synthetic resin tire base portion in a surrounding manner after adhering the hard synthetic resin tire base portion to the outer race of the bearing.
Further, in a method of producing a synthetic resin wheel, there is suggested a producing method comprising steps of forming a tire portion by the soft synthetic resin having a forming temperature lower than that of a wheel portion and forming the wheel portion along an inner side of the tire portion by the hard synthetic resin having a forming temperature higher than that of the tire portion.
In this kind of conventional roller, the synthetic resin tire is integrally adhered to the outer peripheral surface of the outer race in the bearing. Further, since the outer peripheral surface of the outer race in this kind of bearing is formed in a smooth surface, a strong adhesion force over a certain level can not be expected by an interlinking of the adhesive material between the synthetic resin tire adhered by the adhesive material or the like and the outer peripheral surface of the outer race. Accordingly, the synthetic resin tire integrally adhered to the outer race can not stand against the heavy load and the high speed rotation over a certain level when being used in elevators, escalators and the like, so that the adhesion between the outer race and the tire is separated and the tire races on the outer race of the bearing. In the worst case, there is a problem that the tire is taken out from the outer race of the bearing so as to slip off.
Further, in order that the outer race of the bearing and the synthetic resin tire are more firmly adhered to each other, the structure is made so as to firmly adhere the synthetic resin tire on the outer peripheral surface of the outer race by cooling and hardening the temporarily dissolved synthetic resin on the outer race of the bearing in place of the adhesion by simply applying the adhesive material. In this structure, in comparison with the structure simply bonded by an application of the adhesive material, a strong adhesion force can be obtained, however, in this kind of roller used in elevators, escalators, transfer rollers and the like, since there is a case that a significantly heavy load is applied at a starting time or at a time of a sudden stop and a severe using condition that it is necessary to rapidly stop the high speed rotating roller at a time of high speed rotation or a sudden stop is required, there is a problem that the adhesion between the tire and the outer race of the bearing is damaged and peeled off during the use, so that the tire races on the outer race and falls off from the outer race.
Further, in order that the tire adhered to the outer peripheral surface of the outer race in the bearing is integrally adhered to the outer race of the bearing in a stronger manner, the structure is made such that a roller structured such that the tire is constituted by two layers comprising a soft synthetic resin and a hard synthetic resin, an inner tire made of the hard synthetic resin is directly adhered to the outer peripheral surface of the outer race in the bearing so as to obtain a stronger adhesion force, and an outer tire made of the soft synthetic resin is adhered in such a manner as to overlap with the hard synthetic resin inner tire, whereby the tire having two layers is adhered to the outer peripheral surface of the outer race of the bearing in a stronger manner. In this roller, in comparison with the structure made so as to integrally adhere the tire to the outer race by bonding the synthetic resin tire by an application of the adhesive material or cooling and hardening the thermally dissolved synthetic resin on the outer race, a more firm adhesion
Bacon & Thomas PLLC
Hannon Thomas R.
Tokyo Sunworker Co., Ltd.
LandOfFree
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