- #1
Assuming you can apply the same force for both designs, and the end of the handle is perpendicular to the lever arm (which is true for a straight handle, and maximizes torque), torque is just determined by the length of the lever arm - and that does not increase with a curved handle.pukb said:In order to create a higher moment (higher mech adv) it is designed like that. If it were straight as seen usually, it would create moment which is a multiple (sin x) of what is created here. hence Mech Adv is increased by sinx times.
above explanation is true when force is applied normal to handle.
Ranger Mike said:Bemis & Call was an early maker of tools and hardware dating back to an 1844 partnership between Stephen C. Bemis and Amos Call. The company produced a variety of tools including pipe wrenches, monkey wrenches, and other adjustable wrenches, and was especially well known for their S-shaped adjustable wrenches.
The S handle is NOT for ergonomics as the 1844 introduction shows..it is to be able to " snake' into tight restrictive appliactions where the straight handel does not permit tightening or lossening of the nut or pipe flange. I have had to use a propane torch to heat and bend open end wrenchs on many occassions due to very limited room t o swing the wrench.
Ranger Mike said:Since the first patented S handle wrench was in 1844,,,I submit that its purpose was not to address Ergonomics but to remedy one particular requirment of the day...and my best guess was locomotive..
I am sure you are much more versed on this subject than I. I am merely a wrench bender with a college degree and defer to your knowledge...
russ_watters said:The crank handle is probably just curved for aesthetics.
I think you missed the words "crank handle" in the sentence you quoted... That's the object on the right in the picture. It isn't a wrench. It looks like the handle of an old meat grinder:phinds said:I think you must have overlooked the statement about how the S was needed to get the wrench to fit around pipes and stuff.
russ_watters said:I think you missed the words "crank handle" in the sentence you quoted... That's the object on the right in the picture. It isn't a wrench. It looks like the handle of an old meat grinder:
russ_watters said:It looks like the handle of an old meat grinder:
AlephZero said:19th century mech engineers seemed to have an thing about curved spokes rather than straight ones. I suspect they came up with some wrong idea about forces "flowing smoothly" from the spokes into the rim. Of course tangential spokes at the hub (as in modern bike wheels) are a geuninely good idea, but that doesn't seem to be what they were aiming at...
Curved handles are designed to provide a more comfortable and ergonomic grip for the user. The curved shape allows for a more natural and relaxed hand position, reducing strain and fatigue on the muscles and joints.
By providing a more comfortable grip, curved handles can improve the usability of a tool or object by making it easier and more efficient to use. This can also lead to increased precision and control, as the user can focus on the task at hand rather than discomfort or fatigue.
The design of curved handles takes into account the size and shape of the human hand, as well as the mechanics of gripping and holding objects. Factors such as grip strength, hand dexterity, and range of motion are also considered to create a handle that is both comfortable and functional.
While curved handles are generally preferred for their ergonomic benefits, they may not be suitable for all individuals or tasks. Some people may find a straight handle more comfortable, and certain tasks may require a different grip or hand position. Additionally, curved handles may not be as strong or durable as straight handles in certain situations.
Curved handles can be found in a variety of industries and products, from hand tools and kitchen utensils to sports equipment and medical devices. They can be applied in any situation where a comfortable and efficient grip is needed, and can be customized to fit the specific needs and preferences of the user.