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Publication numberUS3559986 A
Publication typeGrant
Publication dateFeb 2, 1971
Filing dateJun 6, 1968
Priority dateJun 6, 1968
Publication numberUS 3559986 A, US 3559986A, US-A-3559986, US3559986 A, US3559986A
InventorsHarry C Ehrmantraut
Original AssigneeHarry C Ehrmantraut
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rollably mounted dollies for leg exercises
US 3559986 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

United States atent [72] lnventor Harry C. Ehrmantraut 541 Hawthorne Ave., Los Altos, Calif. 94022 [21] Appl. No. 735,085 [22] Filed June 6, 1968 [45] Patented Feb. 2, 1971 [54] ROLLABLY MOUNTED DOLLIES FOR LEG EXERCISES 1 Claim, 6 Drawing Figs.

[52] US. Cl 272/79, 272/70 ['51] Int. Cl ..A63b21/00, A63b 23/04 [50] Field ofSearch 272/79, 80, 57(A), 57(8), 57(1), 70, 28

[56] References Cited UNITED STATES PATENTS 430,808 6/1890 Naish 272/57 3,421,760 l/1969 Freeman Assistant Examiner-William R. Browne Attorney-Elehr, Hohbach, Test, Albritton & Herbert ABSTRACT: A pair of dollies supported for rolling movement along one or two guideways permits a person to stand with a foot on each dolly and laterally separate the dollies in exercising the leg muscles. Each dolly carries a tread portion pivotally movable to positions disposed at an angle to the direction of separation of the dollies. A method of exercising the leg muscles while in a standing position with a foot on each dolly includes the steps of laterally spreading the two feet apart to permit the torso to settle toward the ground followed by laterally drawing the feet together to raise the weight of the lowered torso toward its initial position.


It has been observed that one part of the human body which is difficult to exercise properly is the upper thigh area of the leg. particularly the musculature of the inner and posterior sections. These portions are prone to the accumulation of fat deposits. both intramuscularly and subcutaneously.

The musculature of the region described above is most strongly exercised by motions wherein the legs drawn vigorously together from a laterally extended position. Heretofore, these motions have been pursued against the weight of wall pulleys and similar devices. However, there has been a need for a simple portable device which can be conveniently used in the home without the attendant paraphernalia heretofore employed.

SUMMARY OF INVENTION AND OBJECTS In general, there is provided a pair of laterally separable support platforms rollably disposed in one or two guideways serving to accommodate maximum separation of the feet of a person standing with a foot on each movable platform. The platforms each include a pivoted tread portion for the foot of the user to permit the tread portion to pivot about an upright axis. Accordingly, the feet of the user can be variously oriented with respect to the direction of movement of the support platforms.

It is a general object of the invention to provide an improved leg exerciser.

Other objects will become apparent from the following detailed description of the preferred embodiments when considered in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an exercising apparatus, according to the invention;

FIG. 2 is a perspective view, showing an exercising apparatus, according to another embodiment of the invention;

FIG. 3 is a diagrammatic sequence of FIGS. representing the steps in the method, according to the invention;

FIG. 4 is a elevation section view in enlarged detail taken at lines 4-4 of FIG. 2; and

FIGS. 5 and 6 are plan views diagrammatically illustrating the positions ofa pair of dollies in each of two different operations respectively for the exerciser apparatus.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Guide track means. as shown in FIG. 1, comprises a pair of guide tracks 11, 12 of identical construction.

Each track II, 12, accordingly, includes a pair of laterally spaced guide rails 13, 14 adapted to support and guide the rollers 16 of a movable support carriage, or dolly 17, described further below.

Guide rails 13, 14 are held in spaced-apart parallel relation by means of the end spacer bars 18, 19 suitably secured thereto. Bars 18, 19 serve to define the limits of longitudinal movement of each dolly 17 whereby to permit the 2 feet of the user 21 to be spread apart to their maximum extent.

Each dolly 17 includes a foot tread member 22 adapted to support one foot of the user 21 standing thereon. Tread members 22 are movable about an axis 23, 24 to accommodate positioning of the users feet to point in the direction of the path of movement of dollies 17 or variously transversely thereto. Thus, a suitable pivot pin 27 serves to secure member 22 to the upper surface of a support carriage 26 whereby member 22 can be variously oriented about axis 23.

Preferably, the sliding interface between the upper surface of carriage 26 and the downwardly depending flanges 28 has modest antifriction or sliding characteristics whereby the user is required to exert continuing muscular control in maintaining the angular orientation of members 22 with respect to the path 29 of travel. Thus, plastic tubes 25 are retained in the grooves 30 for sliding on the upper surface of carriage 26. Fixed stops 31 limit pivotal movement of tread members 22.

Finally, it is to be noted that axes 23. 24 are disposed well to the side of members 22 and approximately 40 percent of the distance from one end 25a to the other, 25b, whereby the pivoting movement of members 22 further serves to dispose a side 30 of each member 22 closely adjacent the end of dolly 17 when each member 22 has been pivoted substantially normal to the path of dolly movement 29 so that the feet of the user can be brought quite closely together. Axes 23, 24 are, therefore, disposed at a point about one-quarter of the way across the width of members 22.

The length of each tread member causes the end portions 35 to extend substantially equally laterally beyond the width of tracks 11, 12. Members 22 extend equally to opposite sides of the longitudinal Centerline 40 of path 29. Thus, by providing the pivoting tread members 22, it is possible to employ a narrower support carriage 26 and narrower and less awkwardly handled portable tracks l1, 12, than where no tread members 22 are provided. That is to say, that if no members 22 were employed, it would be necessary to employ wider carriages 26 in order to permit the user to perform both styles of exercise described below, i.e., (I) wherein his feet are oriented transversely of path 29; and (2) wherein the uses feet are oriented in the direction of path 29.

Further, the disposition of the pivot axes 23, 24 permits tread members 22 to pivot to positions parallel to path 29 and disposing the width of the tread member 22 substantially equally on both sides of the longitudinal centerline 40, whereby the weight of the user may be evenly carried by wheels 16. Finally, the disposition of pivot axis 23 is a mirror image of the disposition of pivot axis 24 so that each dolly 17 can have the foregoing functions when both dollies 17 are employed together, as in FIGS. 5 and 6.

Each dolly 17 includes reinforcing ribs 32 extending lengthwise along the underside of carriage 26 to permit carriage 26 to be manufactured of relatively lightweight material and yet retain the desired rigidity. In addition to ribs 32, downwardly depending side portions 33 provide additional strengthening as well as the journal support function for each of rollers 16 mounted individually upon axles 34.

As thus arranged, the longitudinal displacement between adjacent dollies 17, as defined by the spacing between end bars 18, 19 serves to permit the user to extend his legs in opposite directions substantially the full extent of a relatively long walking stride whereby dollies 17 can be alternately advanced and retracted by muscular movement of the users legs.

By vigorously working the two dollies 17 between opposite ends of their respective tracks, the users leg muscles will be exercised.

Dollies 17 are readily removable and ride loosely in their guide tracks ll, 12 whereby both dollies 17 can be disposed in a single track 11 as shown in the embodiment of FIG. 2. The latter arrangement has been observed to be particularly effective in exercising the upper thigh area of the leg and particularly in the region of the musculature of the inner and posterior sections thereof.

Accordingly, a method of exercising such regions of the muscles of the legs while in a standing position as shown in FIG. 3 comprises the steps of standing with each foot upon an independently laterally movable support surface such as provided by tread members 22, followed by laterally spreading the two feet apart in a manner and to a sufficient degree to permit the torso of the rider to settle toward the ground. Thereafter, the rider laterally draws the feet together against the resistance of the weight of the lowered torso to raise the torso toward its initial position.

The foregoing steps have been outlined in the diagrammatic sequence shown in FIG. 3 commencing with the uppermost illustration and progressing downwardly.

supported dollies, each dollies adapted to receive one foot of a person standing thereon, guide means cooperating with said dollies for guiding the dollies, a tread supported on each of said dollies, said treads being pivotally mounted on the upper surfaces of the dollies, ribs and a tube along two parallel edges of each tread, the tubes of each tread slidably engaging the upper surface of the respective dollies, and stop means on the upper surface of each dolly to limit the pivotable movement of the tread.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US430808 *Dec 21, 1889Jun 24, 1890 naish
US3421760 *Nov 23, 1965Jan 14, 1969Habern W Freeman JrExerciser device
GB675742A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4046373 *Nov 12, 1975Sep 6, 1977Chong Chan KimMulti-purpose parallel bar exercising apparatus
US4101136 *Jan 17, 1977Jul 18, 1978Corll James AExercising apparatus
US4376532 *Mar 4, 1981Mar 15, 1983Hunstad Vernon DExerciser for muscles used in skiing
US4402506 *Oct 10, 1980Sep 6, 1983Jones William CBody-exercise device
US4506884 *Mar 3, 1983Mar 26, 1985Hankin Stuart MBody stretcher system
US4522392 *Aug 16, 1982Jun 11, 1985Saitama Kako Co., Ltd.Spring type leg exercising device
US4619454 *May 30, 1985Oct 28, 1986Walton Ronald ALeg conditioner for leg split type exercise
US5217420 *Dec 27, 1991Jun 8, 1993Water Products Research Co.Exercise apparatus for underwater use
US5232423 *Jun 18, 1992Aug 3, 1993Hajduczek Richard JExercise apparatus
US5284460 *Jan 29, 1993Feb 8, 1994Town Sports InternationalSkate training exercise apparatus and method
US5300004 *Oct 30, 1992Apr 5, 1994Novel Products, Inc.Abdomen exerciser and method of using same
US5637060 *Jan 19, 1996Jun 10, 1997De Souza; Antonio A. I.Apparatus for performing multiple therapeutic and physical conditioning exercises
US7097593Aug 11, 2003Aug 29, 2006Nautilus, Inc.Combination of treadmill and stair climbing machine
US7125367 *Nov 8, 2002Oct 24, 2006Stearns Kenneth WMulti-purpose exercise apparatus
US7455626Dec 31, 2001Nov 25, 2008Nautilus, Inc.Treadmill
US7517303Feb 25, 2005Apr 14, 2009Nautilus, Inc.Upper body exercise and flywheel enhanced dual deck treadmills
US7544153Aug 8, 2006Jun 9, 2009Nautilus, Inc.Treadmill
US7862489Apr 24, 2007Jan 4, 2011Studio Moderna SaMultipurpose exercise system
US7931570Nov 29, 2006Apr 26, 2011Balanced Body, Inc.Exercise device
US8500611 *Nov 29, 2006Aug 6, 2013Balanced Body, Inc.Dual track exercise device
US20130267389 *Apr 4, 2012Oct 10, 2013Kelvin A. RaumannApparatus for aerobic exercise
US20140005017 *Mar 14, 2013Jan 2, 2014Daniel SmythExercise device and method of using the same
US20140031175 *Jul 26, 2012Jan 30, 2014Charles A. PeraloTherapeutic exercise apparatus with multiple selectively interlockable sliding platforms
USRE42698Oct 8, 2004Sep 13, 2011Nautilus, Inc.Treadmill having dual treads for stepping exercises
DE3232629A1 *Sep 2, 1982Nov 24, 1983Saitama Kako CoVorrichtung zum ausfuehren von leibesuebungen
DE4229970A1 *Sep 8, 1992Mar 10, 1994Ermert CorneliaKeep-fit appts. - comprises two round PVC bars and two slides pref. LDPE which have recesses for the bars
U.S. Classification482/70, 482/71, 482/132
International ClassificationA63B23/04, A63B23/035
Cooperative ClassificationA63B23/03533, A63B22/0046, A63B23/0417, A63B22/14, A63B2022/0038, A63B23/0488, A63B22/203
European ClassificationA63B23/035C4, A63B23/04E2, A63B23/04B2