Patent Application
20220362623
The present invention generally relates to exercise equipment, and more particularly to rowing machines utilizing gear changing mechanisms.
Rowing machines are stationary exercise devices that simulate the motion and forces during rowing. Rowing machines generally include a frame having a movable seat and foot rests and a handle that is connected to a resistance unit. During the drive portion of the stroke, the handle pulls on the resistance unit, which provides resistance to the motion of the handle. During the recovery portion of the stoke, there is no resistance to the motion of the handles.
In certain rowing machines, the handle is connected to the resistance unit through a chain or cord attached to the handle and a mechanism to take up slack of the chain or cord during the stroke. Resistance units for such rowing machines may include one or more of a flywheel, an air or water resistance mechanism, or a magnetic resistance mechanism which provide a resistance force to the pulling of the handle that increases with the speed of the handle. Magnetic resistance mechanisms are electronically controllable, and when used in combination a flywheels and/or an air or water resistance mechanism, can vary the resistance force to the pulling of the handle over a wide range.
One limitation of rowing machines is that they do not provide an easy way for the rower to adjust the resistance during practice. Thus, while the rowing machine may adjust the resistance through a magnetic resistance mechanism, the rower must work against this resistance and cannot, as in bicycles, for example, shift the resistance mechanism to obtain a larger or smaller resistance during rowing. There is need in the art for an rowing machine that provides the rower with a greater degree of resistance control during rowing. Such a rowing machine should be easy for the rower to operate and should be comprised of standard exercise equipment mechanisms.
The present invention overcomes some of the disadvantages of prior art by providing a rowing machine connected to a resistance unit by a chain and gear cassette/derailleur configuration in which the chain extends from a handle, through the derailleur, and though the gears. This configuration provides for a smooth operation not found in other systems.
It is one aspect to provide a rowing machine comprising: a resistance unit including a gear cassette comprising a plurality of gears coupled to a mechanism to resist the rotation of the gear cassette; a frame adapted for placing on the ground and attached to the resistance unit; a seat movable along the frame; a handle; a chain having a first end attached to the handle and a second end attached to the frame; a derailleur attached to the frame; and a gear shifter operably connected to the derailleur. The chain extends, sequentially, from the handle, through the derailleur, and engages a gear of the plurality of gears, such that the engaged gear is selectable using the gear shifter.
It is another aspect to provide a rowing machine attachment connectable to a resistance unit, where the resistance unit includes an axle and a gear cassette comprising a plurality of gears coupled to a mechanism to resist the rotation of the gear cassette. The rowing training attachment includes: a frame adapted for placing on the ground and including a fork end adapted to accept the axle of the resistance unit; a seat movable along the frame; a handle; a chain having a first end attached to the handle and a second end attached to the frame; a derailleur attached to the frame; and a gear shifter operably connected to the derailleur. When frame is attached to the axle of the resistance unit and where the chain extends, sequentially, from the handle, through the derailleur, and engages a gear of the plurality of gears, such that the engaged gear is selectable using the gear shifter.
These features together with the various ancillary provisions and features which will become apparent to those skilled in the art from the following detailed description, are attained by the exercise equipment of the present invention, preferred embodiments thereof being shown with reference to the accompanying drawings, by way of example only, wherein:
Reference symbols are used in the Figures to indicate certain components, aspects or features shown therein, with reference symbols common to more than one Figure indicating like components, aspects or features shown therein.
As shown in
Resistance unit 250 includes a freewheel or freehub assembly including a cassette of gears 251 connected to axle 253 through a one-way clutch that engages with a resistance mechanism (both of which are not shown) within the resistance unit. Resistance unit 250 may, for example and without limitation, be generally similar to prior art resistance units of a wheel off bicycle trainer, such as the Tacx NEO (Garmin Ltd, Schaffhausen, Switzerland). Such resistance units provide a force to resist the rotation of the cassette of gears 251 in one direction and provides little force to resist the rotation of the cassette of gears in the opposite direction. Resistance unit 250 may include one or more of a flywheel, an air or water resistance mechanism, or a magnetic resistance mechanism that is electronically controllable. Resistance unit 250 also includes sensors to measure the power and cadence of the cassette of gears 251, and electronics to accept the sensor measurements, control the resistance to the cassette of gears, and provide information for display on a screen 255.
Power transmission components 230 include chain 233 coupled to the handle 237 with an attachment ring 301, a first chain guide 241 attached to third frame portion 221, a derailleur 243 attached to second end 225 in a position that is above cassette of gears 251 (as shown in
In an alternative embodiment, derailleur 243 may be an electronic system, such as a Shimano Di2 electric drivetrain (Shimano Inc, Sakai, Japan) or Campagnolo EPS (Campagnolo Vicenza, Italy), or a wireless system, such as SRAM eTap (SRAM, Chicago, Ill.).
Chain return mechanism 232, shown in
In an alternative embodiment, chain return mechanism 232 includes an elastic cord that pulls on an end of chain 233 as provided, for example and without limitation, by the Concept2 skewer assembly (Morrisville, Vt.) (see, for example, https://shop.concept2.com/model-b/249-skewer-assembly. html?search_query=skewer+assembly&results=6). In another alternative embodiment, chain return mechanism is a spring loaded cylinder that takes up the slack in chain 233, or a gravity return mechanism (see, for example, US Patent Application Publication No. US20140243163A1, the content of which are incorporated by reference).
Resistance unit 250 thus provides a force that counters forces provided by a rower. The force provided by resistance unit 250 is transferred from axle 253, to one of gears of gear cassette 251, to chain 233 of compound cable 231, to the handle 237. In addition to resistance due to a flywheel or an electromagnetic or other mechanism for controlling the resistance, the gear shifter 247 and derailleurs 243 allow for rower to control the resistance. Slack in chain 233 is taken up by chain return mechanism 232.
One use of rowing attachment 200 is illustrated with reference to
At the beginning of a stroke, as shown in
During a stoke, as the handle 237 is pulled backwards and away from resistance unit 250, a tension is provided to chain 233 by resistance unit 250 and while elastic cord 235 takes up any slack in compound cable 231. The tension in chain 233 is provided by the force required to rotate gears 251, which may be regulated by the rower using gear shifter 247 to activate derailleur 243 and thus select a gear of gears 251. Alternatively, or in combination with gear shifter 247, the force required to rotate gears 251 may be adjusted using software in resistance unit 250. Thus, for example, certain embodiments of resistance unit 250 include sensors to monitor the rotation speed of gears 251 and electronics to determine power expended during rowing. In certain other embodiments, resistance unit 250 is in communication with a computer or electronic device, such as a smartphone, which can receive information from resistance unit 250 and which may also provide instructions to the resistance unit to modify the resistance provided by the resistance unit. The end of stroke is illustrated in
After the end of the stroke, rower R moves forward to the position shown in
The inventor found that a rowing machine having a derailleur below the gears, as is generally provided on bicycles or bicycle trainers provides engagement of the one way-clutch at the beginning of a stroke that is not smooth. Thus, for example, shifting under load, as on an upstroke, can be painful for the rower. In contrast, placing the derailleur above the gears, as in
Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner, as would be apparent to one of ordinary skill in the art from this disclosure, in one or more embodiments.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of this invention.
Thus, while there has been described what is believed to be the preferred embodiments of the invention, those skilled in the art will recognize that other and further modifications may be made thereto without departing from the spirit of the invention, and it is intended to claim all such changes and modifications as fall within the scope of the invention. Steps may be added or deleted to methods described within the scope of the present invention.
