An incrementally variable transmission machine with an input drive and an output drive which are linked by a drive chain, and which includes an oscillating cam arrangement which, at each of two limiting positions, can act on an actuating mechanism to vary the speed of the output drive by …

Legal parties

Inventors (applicants): Johannes Jacobus Naude
Assignees (initial): Varibox IP (Pty) Ltd. (Randburg, ZA
Agents: Young & Thompson (attorney)

The application was examined by Mark K Buse, William E Dondero (USPTO dept. 3654)


  • 1. A variable transmission machine, comprising: …
  • 2. The machine according to claim 1 , wherein the actuating mechanism includes a first …
  • 3. The machine according to claim 2 , wherein each actuator is selectively operable …

International priority data

ZA: 2008/06882 / Aug. 6, 2008 (national)
ZA: 2008/03783 / Apr. 25, 2008 (national)

Cited documents


  • Tay US 2006/0252589 A1 / 474/83, Nov. 1, 2006
  • Woyton US 4770065 A / 477/44, Sep. 1, 1988
  • Naude US 7713153 B2 / 474/49, May. 1, 2010
  • Naude US 2005/0221926 A1 / 474/8, Oct. 1, 2005
  • WO 2010040153 A1, Apr. 1, 2010
  • WO 2007037747 A1, Apr. 1, 2007
  • WO 03056212 A1, Jul. 1, 2003
  • Naude US 2010/0062885 A1 / 474/49, Mar. 1, 2010
  • Naude US 7563185 B2 / 474/49, Jul. 1, 2009
  • WO 2005036028 A1, Apr. 1, 2005
  • WO 2007059539 A1, May. 1, 2007
  • Unno US 2007/0207884 A1 / 474/18, Sep. 1, 2007
  • Naude US 2008/0058135 A1 / 474/8, Mar. 1, 2008
  • Naude US 2008/0115623 A1 / 74/665.B, May. 1, 2008
  • Clough US 4929218 A / 474/83, May. 1, 1990

Brief Description of the Drawings

The invention is further described by way of example with reference to the accompanying drawings in which: FIGS. 1A and 1B are plan views of a variable transmission (IVT) machine …


Background of the Invention

This invention relates to a variable transmission (IVT) machine in which the ratio of an output rotational speed to an input rotational speed, of the machine, is adjustable in increments. …

Description of Preferred Embodiment

The accompanying drawings illustrate different aspects and parts of a machine 10 according to the invention. The components of the machine are mounted in any appropriate housing 12 (shown notionally …

More details about Incremental Variable Transmission

Miscellaneous patent data

The published agent's organization is Young & Thompson, numbered 12/989,459 (application), the protection scope is defined by 20 claims, the published applicant's name is Naude Johannes Jacobus, the patent particularly claims a variable transmission machine, comprising…, similar classification categories are Gearings providing a continuous range of gear ratios, particular belt, in which the member B has a conical friction surface, Use of materials, Use of treatments of toothed members or worms to affect their intrinsic material properties, only one flange of each pulley being adjustable, Shifter actuated by flexible cable, Including means interconnecting plural pulleys for simultaneous adjustment, Belt selection by shifting or tightening belt, belts, with V-belts, Mounted on laterally shiftable motor, developed by Johannes Jacobus Naude, the patent was granted on Sep. 24, 2013, the grant publication number is 08540596, was examined by 3654 USPTO department, the examiners - William E Dondero, Mark K Buse, includes the following drawings: Incremental Variable Transmission, plan views of a variable, Side view of part of the machine, Perspective view of the machine, 27 figures depict the invention details, categorized under Pulley With Belt-Receiving Groove Formed by Drive Faces on Relatively Axially Movable Coaxial Confronting Members as a primary classification, the invention description is illustrated by 16 drawings, assigned to a foreign company or corporation, the inventor's first name is Johannes Jacobus, and his last name is Naude, the application publication date is Apr. 23, 2009, the patent extension term is 403 days, the invention is named Incremental Variable Transmission, the claim number 1 is selected as exemplary, located in Randburg (ZA), the assignee company is Varibox IP (Pty) Ltd.

Invention classification information

The invention is classified under Pulley With Belt-Receiving Groove Formed by Drive Faces on Relatively Axially Movable Coaxial Confronting Members, with endless flexible members, of which the bearing parts are radially adjustable, both flanges of the pulleys being adjustable, using chains, toothed belts, belts in the form of links, Chains or belts specially adapted to such gearing, of which the bearing parts are relatively axially adjustable.

Patent details
Publication number 08540596
Publication date Sep. 24, 2013
Kind code B2
Application number 12/989,459
Application date Apr. 23, 2009
Application type U
Application series code 12
Int. pub. country WO
Int. pub. number WO2009/132364
Int. publication Oct. 29, 2009
Int. filing country WO
Int. filing PCT/ZA2009/000031
Filed internationally Apr. 23, 2009
National stage date Oct. 25, 2010
Extension term 403
National classification 474/8
Total number of claims 20
Exemplary claims 1
Number of drawings 16
Number of figures 27
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