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US 4,904,232 AGranted
Power transmission belt
AssigneeMitsuboshi Belting Ltd.
InventorsKoji Kitahama, Toshimi Kumasaki
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AssigneeMitsuboshi Belting Ltd.
InventorsKoji Kitahama, Toshimi Kumasaki
Estimating the term…
A multiribbed power transmission belt having an inner portion of the compression section thereof defined by arcuate side surfaces converging inwardly. In one form, the side surfaces are circular. The outer portion of the compression section is defined by planar side surfaces converging inwardly. In one embodiment, the outer portion side surfaces are tangent to the inner portion arcuate surfaces and, in another form, the outer portion planar side surfaces intersect the arcuate side surfaces of the inner portion of the compression section. The distal tip of the ribs, in one form, is circular concentric with the side surfaces of the inner portion. In an alternative disclosed form, the tip surface is planar transversely to the rib.
A multiribbed power transmission belt comprising:
A multiribbed power transmission belt comprising:
A multiribbed power transmission belt comprising an outer portion having a plurality of transversely spaced, longitudinally extending tensile cords embedded therein;
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
No related US applications are recorded in the indexed filing history.
With reinforcement bonded by the rubber: with metal reinforcement
Driving-belts: with a contact surface of special shape, e.g. toothed
V-belts, i.e. belts of tapered cross-section: with a contact surface of special shape, e.g. toothed
Belts, cables, or ropes, predominantly used for driving purposes
Term ended 31 Oct 2008 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates to power transmission belts and in particular to power transmission belts having a plurality of transversely spaced, longitudinally extending ribs.
In one form of multiribbed power transmission belt, a problem has arisen in that cracks tend to form in the ribs extending inwardly from the tip to the root of the ribs, such as when the belt is reversely bent in the drive system.
It is conventional in such prior art belts to provide distributed short fibers oriented transversely to th longitudinal extent of the belt and distributed in the rib portion.
Other features and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawing wherein:
FIG. 1 is a fragmentary sectional perspective view of a power transmission belt embodying the invention;
FIG. 2 is a fragmentary enlarged cross section thereof;
In the illustrative embodiment of the invention as disclosed in the drawing, a power transmission belt generally designated 10 is shown to comprise a multiribbed belt having an outer belt portion 11 provided with a plurality of transversely spaced, longitudinally extending tensile cords 12. The outer surface of the belt is provided with a fabric cover 13.
The compression section, generally designated 14, of the belt defines a plurality of ribs 15. Each rib includes an outer portion 16 and a distal inner portion 17.
As shown in FIG. 1, the ribs are transversely spaced and extend longitudinally of the belt parallel to the tensile cords 12.