Door Stop Statistics

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Introduction

The system considered in this project consists of a primed steel door attached to the wall by the means of three spring-loaded hinges, and a door-stop that is used to statically stop the door. The door-stop should be designed such that it is able to resist the torque provided by the hinges and prevent the door from closing. The floor and the stopper should be designed such that they are able to provide sufficient frictional force.

The aim of the project is to study the effect of floor surface roughness while considering friction, as well as find the amount of internal forces inserted on the top hinge shafts

Assumptions

1. Hinge model, FHD-A1-1-104, is used
2. While doing force calculations, vertical force is assumed to be shared equally by all three hinges
3. Since considering three hinges would make the system statically indeterminate, the horizontal reaction force at the hinge at the bottom is assumed to be zero.

Section A:

We know, from the catalogue, that the maximum torque that can be provided by this hinge is 5 Nm. Therefore, the total torque caused by three hinges combined: T = 5 x 3 = 15 Nm

Ideally, the door-stop should be placed at the extreme end of the door to maximize the torque contribution of the constant friction force. However, the door-stop might slip out of the door if it is placed at the extreme end. So, we place it at a distance, d = 45 inches from the edge of the door....

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