Source: http://www.google.com/patents/US4838548?dq=6,304,975
Timestamp: 2016-07-26 16:14:16
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Patent US4838548 - Four-bar variable resistance leg extension machine - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA leg extension exercise machine which utilizes a frame-journaled rotating effort arm, which is mechanically linked to a frame-journaled rotating weight arm, which, together with the frame of the machine and the connecting link joining them, form a simple planar double-rocking-lever four-bar linkage,...http://www.google.com/patents/US4838548?utm_source=gb-gplus-sharePatent US4838548 - Four-bar variable resistance leg extension machineAdvanced Patent SearchPublication numberUS4838548 APublication typeGrantApplication numberUS 07/239,606Publication dateJun 13, 1989Filing dateSep 1, 1988Priority dateSep 1, 1988Fee statusPaidPublication number07239606, 239606, US 4838548 A, US 4838548A, US-A-4838548, US4838548 A, US4838548AInventorsHenry H. MaagOriginal AssigneeMaag Henry HExport CitationBiBTeX, EndNote, RefManPatent Citations (9), Referenced by (17), Classifications (7), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetFour-bar variable resistance leg extension machine
Centered about the machine's plane of symmetry is a rotating effort arm assembly (assembly 2.0) which rotates about an axis (axis A) which is both parallel with the ground plane and positioned to be approximately common with the axes through the operator's knee joints while in the operating position. This rotating effort arm assembly is pivotally mounted to the machine's frame by a steel pin which is centered on axis A in frame-attached flanges (parts 1.9) which are located on the top side of the forward bend section of part 1.1 in a position between the operator's knee joints while in the operating position. It is composed primarily of two irregularly shaped bent steel plates (parts 2.1) which are both partially parallel with each other and symmetrical about the machine's plane of symmetry. These two bent steel plates are joined to each other at their upper parallel sections by a short section of angle iron (part 2.2) which lies transversely between them as shown. Journaled in a pair of short colinear bearing tubes (parts 2.4) which are mounted in the upper rearward ends of the upper parallel sections of these two bent steel plates are the bearings which engage the steel pin which mounts this assembly to the machine's frame at axis A. Mounted to the lower rearward sides of the bent out portions of the bent steel plates (parts 2.1) are a pair of shin pad mounting plates (parts 2.3R & 2.3L) which mount a pair of right and left shin-engaging pads (parts 6.3R & 6.3L) which engage the fronts of the operator's corresponding right and left shins respectively. Parallel to and offset by 4.0" from the colinear pair of bearings lying on axis A are a second colinear pair of bearings, lying on axis B, which are also journaled in the upper parallel sections of parts 2.1. This second set of bearings journals a second steel pin which is used in connecting a connecting link from the rotating effort arm assembly (assembly 2.0) to the rotating weight arm assembly (assembly 3.0). As shown in FIG. 3, the direction to axis B from axis A is along a line which forms a 102.6� angle with the line connecting axis A with axis C at the beginning of the exercise movement.
As shown in FIGS. 1 & 2, this invention contains a rotating weight arm assembly (assembly 3.0) which rotates about an axis (axis C) which is both parallel with and offset by 14.0" from the axis of rotation of the rotating effort arm assembly (assembly 2.0, axis A). Like the rotating effort arm assembly, this rotating weight arm assembly is also centered about the machine's plane of symmetry and pivotally mounted to the machine's frame by a steel pin which is centered on axis C in colinear bearings which are journaled in a short transverse bearing tube (part 1.10) which is welded into part 1.1 just below the seat pad as shown in FIG. 2. It is composed primarily of two parallel triangularly shaped steel plates (parts 3.1) which are symmetrical about the machine's plane of symmetry. These two triangularly shaped parallel steel plates are joined to each other at their forward and rearward ends by two short straight rectangular steel bars (parts 3.2) which lie transversely between their respective forward and rearward ends as shown. This assembly (assembly 3.0) is pivotally mounted to the machine's frame at its rearward end by the steel pin mentioned earlier which mounts through a pair of colinear holes drilled in the rearward ends of parts 3.1 as shown. Parallel to and offset by 20.0" from the pair of colinear holes lying on axis C are a second pair of colinear holes which are drilled in the upper center sections of parts 3.1 on axis D. This second set of colinear holes journals a second steel pin which is used in connecting the connecting link mentioned earlier from the rotating effort arm assembly (assembly 2.0) at axis B to the rotating weight arm assembly (assembly 3.0) at axis D. Attached to the forward ends of these two parallel triangularly shaped steel plates (parts 3.1) and lying on an axis (axis E) which is both parallel with and separated from the assembly's axis of rotation (axis C) by a distance of 43.0" is a weight applying means which can take either the simple form of a horizontal bar (part 3.3) for loading plate weights onto or the more complex form of a selectorized weight stack assembly (assembly 5.0) which is composed of the standard rocking weight supporting rod with spaced apertures (part 5.3) which is pivotally mounted to the rotating weight arm by a steel pin at axis E and which extends down through a set of vertically stacked weights (parts 5.1) which are free to move up and down a rocking guide assembly (part 5.2) which is pivotally attached to the front of the machine's frame in frame-attached flanges (parts 1.11) at axis F and which extends up through the set of vertically stacked weights. As is conventional, a desired quantity of weights can be quickly and easily mechanically joined to part 5.3 by operator manipulation of a weight engaging key pin (part 5.4) which extends through a selected aperture in the set of weights into a mating aperture in the pivotal weight supporting rod (part 5.3). The angle formed between the line connecting axis E with axis C and the horizontal line passing through axis C is 1.3� below horizontal at the beginning of the exercise movement as shown in FIG. 3.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS2855199 *Nov 9, 1955Oct 7, 1958N K Products CompanyExercise deviceUS3917262 *Jan 31, 1974Nov 4, 1975Larry A SalkeldLeg exercising apparatusUS4336934 *Feb 27, 1981Jun 29, 1982Corbin Gentry, Inc.Rowing exercise machineUS4357010 *Nov 7, 1980Nov 2, 1982Telle Jerome RMultipurpose exercising machineUS4407495 *Sep 12, 1980Oct 4, 1983Wilson Ronald AMulti-purpose exercise apparatusUS4509745 *Jun 18, 1982Apr 9, 1985Angsten Gregory SWeight lifting deviceUS4509746 *Jul 19, 1983Apr 9, 1985Mask Ernest DArticulated exercise bench with leg curl deviceUS4757991 *Jan 27, 1987Jul 19, 1988Henry MaagLat isolating exercise machineUS4790530 *Apr 14, 1987Dec 13, 1988Henry MaagArm flexion exercise machine* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS5056779 *Jul 20, 1990Oct 15, 1991Nautilus Acquisition CorporationTorso exercise machine with range limiterUS5106081 *Jan 28, 1991Apr 21, 1992Nautilus Acquisition CorporationLeg exercise machineUS5263914 *Mar 15, 1991Nov 23, 1993Loredan Biomedical, Inc.Weight machineUS5484365 *May 13, 1993Jan 16, 1996Medx CorporationLeg press exercise machineUS5554090 *Dec 30, 1994Sep 10, 1996Hammer Strength CorporationCalf exercise machineUS6244996 *Aug 3, 1999Jun 12, 2001Medx 96, Inc.Leg extension machineUS6264585 *May 14, 1998Jul 24, 2001Claude BeauchampDirect drive exercising apparatusUS6482128Nov 5, 1999Nov 19, 2002Acinonyx CompanyRun specific training methodUS6666801Jul 20, 2001Dec 23, 2003Acinonyx CompanySports specific training method and apparatusUS6764429Oct 21, 2002Jul 20, 2004Acinonyx CompanyRun specific training apparatusUS7220221 *May 2, 2001May 22, 2007Nautilus, Inc.Exercise device with body extension mechanismUS7614985Apr 25, 2007Nov 10, 2009Nautilus, Inc.Exercise device with body extension mechanismUS7922635Apr 12, 2011Nautilus, Inc.Adjustable-load unitary multi-position bench exercise unitUS20020052268 *May 2, 2001May 2, 2002Vicente Morcillo-QuinteroExercise machine providing for natural movementUS20020128124 *May 2, 2001Sep 12, 2002Urs MosimannExercise device with body extension mechanismUS20070270290 *Apr 25, 2007Nov 22, 2007Nautilus, Inc.Exercise device with body extension mechanismUS20080227606 *Feb 15, 2008Sep 18, 2008Mario FedrigaGymnastic machine* Cited by examinerClassifications U.S. Classification482/100, 482/137International ClassificationA63B23/04Cooperative ClassificationA63B21/0632, A63B23/0494, A63B2208/0233European ClassificationA63B23/04KLegal EventsDateCodeEventDescriptionDec 4, 1992FPAYFee paymentYear of fee payment: 4Dec 6, 1996FPAYFee paymentYear of fee payment: 8Mar 16, 1998ASAssignmentOwner name: PACIFIC FITNESS CORPORATION, A CORP. OF CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MAAG, HENRY;REEL/FRAME:009027/0784Effective date: 19971120Oct 19, 1998ASAssignmentOwner name: PRECOR INCORPORATED, WASHINGTONFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PACIFIC FITNESS COPORATION;REEL/FRAME:009547/0147Effective date: 19980922Sep 21, 2000ASAssignmentOwner name: ILLINOIS TOOL WORKS INC., ILLINOISFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PRECOR INCORPORATED;REEL/FRAME:011390/0197Effective date: 20000714Dec 12, 2000FPAYFee paymentYear of fee payment: 12Feb 27, 2003ASAssignmentOwner name: PRECOR INCORPORATED, WASHINGTONFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ILLINOIS TOOL WORKS, INC.;REEL/FRAME:013447/0040Effective date: 20030206RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services