Roll or roller – With specific roller exterior surface structure – Surface projections – indentations – or slits
Reexamination Certificate
2000-07-06
2002-11-19
Bryant, David P. (Department: 3726)
Roll or roller
With specific roller exterior surface structure
Surface projections, indentations, or slits
C492S035000, C492S036000, C492S049000, C152S393000, C301S005306, C301S005308, C384S449000, C384S543000
Reexamination Certificate
active
06482140
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, is required to have a suitable elastic force and abrasion resistance, and is structured so as to mount a tire for a high speed rotation and a heavy load, such as in an escalator, a moving walkway and the like, in which safety is highest priority, and particularly to a roller mounted so that the tire and the bearing do not skip even when the heavy load is applied at a time of starting the rotation and by a sudden stop, and a method of producing the same.
2. Prior Art
This kind of conventional roller is used on a rotating portion which rotates at a high speed, is exposed to a heavy load, is required to have a suitable elastic force and abrasion resistance, and ensures safety with the highest priority in environments such as transfer rollers, elevators, guide rollers, escalators, moving walkways, and the like, when mounting a synthetic resin tire. The roller of this kind is structured so 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 to have an abrasion resistance and a suitable elastic force together with a resistance against high speed rotation and a heavy load. The roller, which is structured so that the synthetic resin tire used in the rotating portion in which safety is required as the highest priority, is mounted to the bearing, 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 made of a soft synthetic resin to meet a requirement of the abrasion resistance and the elastic force, and a tire base or inner portion directly adhered to the outer race of the bearing made of a hard synthetic resin to bear a resistance against the high speed rotation and the heavy load. There is suggested a roller which is structured so that the synthetic resin tire integrally adhered to the bearing in a surrounding manner is constituted by having two layers, hard and soft, respectively, a synthetic resin tire, and a method of producing the same.
Conventionally, in this kind of roller structured so 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. This conventional roller as used for elevators, escalators, transfer rollers, guide rollers, moving walkways, and the like, rotates at a high speed, is exposed to a heavy load, is used under very severe conditions, is required to have a suitable elastic force and an abrasion resistance in accordance with its use, and is required to ensure safety as the highest priority. Accordingly, in order to obtain a stronger adhesion, there is suggested a structure 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 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 to ensure 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, which 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, which 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 two, hard and soft layers to the outer race of the bearing, the tire 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 with a 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 with a 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 into a smooth surface, a strong adhesion force above a certain level cannot be expected from 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 cannot 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 slips on the outer race of the bearing. In the worst case, there is a problem in 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 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, there is a possibility that a significantly heavy load is applied at a starting time or at a time of a sudden stop, and in severe using conditions, it is necessary to rapidly stop the high speed rotating roller at a time of high speed rotation, or a sudden stop is required. As a result, there is a problem in 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 slips 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 so 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 being 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 being 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 adhesive material or cooling and hardening the thermally dissolved synthetic resin on the outer race, a more firm adhesion force can be obtained. However, a load of some hu
Armstrong Westerman & Hattori, LLP
Bryant David P.
Nguyen T.
Tashico Corporation
LandOfFree
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