This report is a part of the course MSGC17 for Bachelor in Mechanical Engineering. The course were held at the University of Karlstad. The project was performed on behalf of a company that manufactures doors. The purpose of the project was to develope a door closing device. The closing device were supposed to be innovative and have an aesthetically pleasing design, since this was lacking in current products. The work resulted in a design proposal for a doorcloser which is recessed in the door leaf. This type of mounting results in a aesthetically pleasing design since it is not visible at all. This result were achieved through the use of the product development process according to Johannesson et al. (2013). This process included a plan for the project, prestudy, concept generation, evaluation and selection, layout design and prototyping. The prestudy was an important part of the project. This part led to many innovative ideas that could be brought into the concept generation phase. The final design proposal was inspired by a cord retractor from a vacuum cleaner. When the design proposal was developed a prototype were made as a final part of the project. The task of the prototype was to show the function of the structure in a simple way. The conclusion to be drawn is that the generated construction meets the requirements of the specification. Further work after this project will be to produce a prototype in full scale for different types of tests.

The door and its surrounding, is an important part of all buildings. It often amount to a significant part of buildings total costs. The more demands of functions the largerdoes the costs grow. The purpose of this report is to analyze those demands and how to fulfill them. Another purpose is to examine of which reasons the cost grow and how to avoid it inthe best possible way. The study will be performed in collaboration with Bjerking AB. To define the demands a literature study will also be performed. The essential part however will be interviews with persons with different employment regarding doors. The literature study shows the demanding are very different depending on several aspects. Those could be such things as the number of people passing and how the building is meant to be used. The results of the interviews shows doors and their surroundings are very complicated. The reasons are many. One of them is that persons are limited to their own employment and don’t have the knowledge to see the full context. Increased communication is a solution to that problem among others. With increased knowledge it’s possible to select better and cheaper solutions. Such solutions is about both choosing products and planning buildings design. There seem to be possible to develop doors and its surroundings in several ways. The interviewed persons often mention the door closer as one product they would likedevelopment in. It’s important it closes hard enough but it makes the door heavy to open since both forces often are equal. The problem today in developing better products is to find a participant willing to paythe cost the development requires.