David Fisher responded to the needs of furniture workers by trying to make their work easier, safer and more productive. He created and patented two devices which eased the burden of these workers and improved their efforts.

His first invention was aimed at freeing up time for carpenters and furniture makers. At the time, when furniture was being put together, a worker was forced to work in slow steps, pausing at various times to combine pieces of wood together in order to allow glue to bind them. Fisher solved this delay by developing the joiner’s clamp, which he patented on April 20, 1875. The joiner’s clamp consisted of two pieces of wood connected by two screws. When tightened, the screws pushed the pieces of wood together. He used this device to hold together furniture parts as they were glued, thus freeing the worker to continuing assembling the item. By using applied, balanced pressure, the joiner’s clamp caused the wood to bind together, faster and stronger than was previously possible.

Another dilemma facing workers in the furniture industry was the laborious task of moving heavy pieces of furniture. In addition to having to concern themselves with their own physical safety, they also had to worry about dropping the furniture and damaging other items in the room by bumping into them. On March 14, 1876, Fisher patented the furniture caster. This device was a free turning wheel that could (when combined with a few others) allow heavy items to move around a room on rollers, safely and efficiently. This enabled one person to move large pieces of furniture, allowing other workers to tend to other items. This device is now used in almost every industry a well as in most homes.