 Universal combined milling and boring machine |
| OF THE PREFERRED EMBODIMENTS The universal combined milling and boring machine shown in FIGS. 1 ... |
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| Multi-axis machining head |
| The present invention overcomes these drawbacks by providing a machining head attachment for a ... |
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| Leg stretching device |
| Therefore, the main object of the present invention is to provide a leg stretching device that is ... |
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| Slot-head fastener and driver therefor |
| What is claimed is: 1. A slot head fastener and driver therefor comprising: a slot head fastener ... |
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| Apparatus for stripping electrical wires and the like |
| I claim: 1. Improved apparatus for stripping electric cables and the like, characterized by ... |
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| Ratchet locking plier |
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| Apparatus for gripping a tubular member |
| What is claimed is: 1. An apparatus for gripping a tubular member (118), which apparatus comprises ... |
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| Reversible wrench having instantaneously gripping friction drive |
| The present invention overcomes the foregoing shortcomings and limitations of the prior art ... |
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| Multi-purpose hand tool |
| A multi-purpose hand tool utilizes a tubular body connected with a pair of hexical joints at two ... |
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| Power wrench |
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Planetary belt transmission and drive
| Details |
Inventors: Mills, Dennis; Huijbers, Johannes J. W. G. M.;
Assignee: DaVinci Technology Corporation (Long Lake, MN)
Primary Examiner: Wright; Dirk
Assistant Examiner:
Attorney, Agent or Firm: Schwegman, Lundberg, Woessner, and Kluth, P.A.
A transmission includes a ring member, a sun member, a number of planetary sheaves and a serpentine drive member which wraps around the sun member, and the planetary sheaves. The planetary sheaves are attached to a planet carrier at a distance from the sun member. When the serpentine drive member is wrapped around the sun member and the planetary sheaves, the serpentine drive member forms a C-shape. The transmission can be used in a device that has an input shaft that must be rotated at a first speed and an output shaft that must be rotated at a second speed. The transmission can even be used as a reverser. The serpentine drive member can be any type of drive member, including a timing belt with teeth, a flat belt, a cable chain, or a link chain. |
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DETAILED DESCRIPTION A planetary belt transmission includes a ring gear, a sun gear, a number of planetary sheaves and a belt which wraps around the sun gear, and the planet sheaves.
The planet sheaves are attached to a planet carrier.
The planet sheaves have no teeth.
The ring gear and the sun gear have teeth in the embodiment of the planetary belt transmission which uses a toothed belt.
In the embodiment using a toothed belt, the belt has a number of teeth which have a tooth profile which meshes with the teeth of the sun gear and the teeth of the ring gear.
The flat part of the belt passes over the plurality of planet sheaves.
When the belt is wrapped around the sun gear and the planetary sheaves, the belt generally forms a C-shape.
The belt can also be thought of as generally forming a polygon with linear sides, with the exception of one side which has a U-shape.
The bottom of the U wraps around the sun gear.
The planetary belt transmission can be used in a device that has an input shaft that must be rotated at a first speed and an output shaft that must be rotated at a second speed.
The rotary belt transmission can also be used to provide a reverse direction for the input shaft when the ring gear is held in a fixed position.
Another embodiment of the planetary belt transmission uses a roller chain rather than a toothed belt.
In the roller chain embodiment, planet gears, ring gear, and the sun gear have sprocket teeth which mesh with the rollers of the chain.
When the roller chain is wrapped around the sun gear and the planetary gears, the roller chain generally forms a C-shape.
The roller chain can also be thought of as generally forming a polygon with linear sides, with the exception of one side which has a U-shape.
The bottom of the "U" wraps around the sun gear.
The roller chain can also be replaced with cable chains and mating chain sprockets.
The planetary belt transmission can also be formed with a flat belt that wraps around the sun member, the planet sheaves and the ring member
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Metal Working 
