US 4,404,771 AGranted

Roller assembly for sliding closures

AssigneesThe Nippon Aluminum Mfg. Co., Ltd., Nippon Alumi Jutaku-Kenzai Kogyo Co., Ltd.

InventorsYasushi Murase, Tosiyuki Kanegae, Hideaki Mitsuzawa, Tosiyuki Tatsumi

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Abstract

A door roller provided with an engagement arm which is capable of being engaged with, by an engaging member attached to an upwardly bent end of the engaging arm, a guide groove formed with a downward opening longitudinally along a lower frame of a window structure for preventing a sliding door from an accidental removal. An inner housing retaining a tire shaft is rotatably pivoted to an outer housing of the door roller via another axis parallel to the tire shaft. The engagement arm which is engaged with the inner housing by way of an engaging mechanism is disposed freely movable upwards and downwards in relation to the outer housing. The engaging mechanism is located at a further position than the tire shaft from the another axis such that the engagement arm may be moved vertically, when the tire has been ascended or descended by a predetermined amount, by a larger amount than or an approx. equal amount to the predetermined amount in relation to the outer housing.

Claims11

Dependent claims

In a sliding closure which is mounted on a structure defining an opening and which moves toward and transversely to a plane in which said opening lies for moving a portion of said closure in a direction toward said plane, a roller assembly which is to be disposed at least one at the lower portion of said structure for being moved in rotation on a substantially flat surface situated on a lower frame of said structure, being built into a step-like form, said roller assembly comprising:

a roller body;
an inner housing having a first rotation axis for rotatably retaining said roller body;
an outer housing attached to said closure for accommodating said inner housing therein so as to be rotatable about a pivotal second axis which is located at a separate position from, and is parallel to, said first axis;
a biasing means anchored between said inner housing and said outer housing for biasing said inner housing rotatably about said second axis such that at least a part of said roller body can be exposed outside from a lower opening of said outer housing;
and
an engagement arm means which is vertically movable according to the rotational movement of said inner housing about said second axis and is thereby capable of preventing said closure from getting out of the structure by means of being engaged, when it is ascended, with a guide groove which is formed on a vertical wall portion of said steplike form along the longitudinal direction thereof.

3 more elements

Dependencies are inferred from the claim text.