A doorway mounted chin-up bar has a rod with an interior tube that is telescopically received within a rotating sleeve. A mount is positioned on each end of the rod for securing the rod to a doorjamb. A pair of U-shaped extension bars extend outward and upward from the rod. Each of the extension bars have first and second ends that extend out of planes that are defined by the doorway in first and second directions, respectively. A first hand-grip bar is affixed to the first ends of the extension bars and a second hand-grip bar is affixed to the second ends of the extension bars. When a user grasps the first hand-grip bar and pulls down, the extension bars pivot about the rod until the second hand-grip bar engages a wall surface above the doorway. The user may engage in chin-ups while being supported by the first hand-grip bar. Alternatively, a user may grasp the second hand-grip bar and pull down until the first hand-grip bar engages a wall surface above the doorway. The second hand-grip bar supports the user while the user engages in chin-ups. The first and second hand-grip bars are different distances away from the rod such that the hand-grip bars will be at different heights above the floor.

TECHNICAL FIELD
 This invention relates to home exercise equipment. In particular, the
 invention relates to a chin-bar that may be installed within a doorway of
 a home and that is adjustable to accommodate users of different heights.
 BACKGROUND OF THE INVENTION
 Door mounted exercise bar devices are known in the art. Exercise bar
 devices are taught in U.S. Pat. No. 3,915,452 to Winblad for a "Portable
 Chinning Bar Assembly", U.S. Pat. No. 4,529,191 to Miller, et al. for a
 "Doorway Mounted Horizontal Bar", U.S. Pat. No. 5,417,628 to Vanderbleek
 for an "Exercise Device for Chin-Ups" and U.S. Pat. No. 5,180,350 to
 Thomas for an "Exercise Bar Apparatus". The related art devices teach
 various methods and devices for mounting an exercise bar within a doorway.
 U.S. Pat. No. 4,458,894 to Dudley for a "Portable Support Bar Assembly"
 teaches a device for affixing a first horizontal bar to a door-jamb for
 supporting a second horizontal support bar outwardly and above a doorway.
 Improvements are desired in ease of installation. Also, a disadvantage
 with the related art devices is that once the exercise device is secure
 within a doorway, the hand-grip bar is set at a specific height.
 Therefore, the device does not easily accommodate users of different
 heights.
 BRIEF SUMMARY OF THE INVENTION
 The apparatus of the invention is a doorway mounted chin-up bar device
 having a rod that secures to an inside of a doorway. Preferably, the rod
 is comprised of an interior tube and an exterior rotating sleeve, wherein
 the interior tube is received in telescoping engagement within the
 rotating sleeve. A mount is positioned on each end of the rod for securing
 the rod within the doorway.
 A pair of approximately U-shaped extension bars are pivotally affixed
 perpendicularly to the rod. The extension bars extend outward from the rod
 and extend upward. The extension bars have a first end that extends out of
 a plane defined by the doorway in a first direction and a second end that
 extends out of the plane of the doorway in a second direction. A first
 hand-grip bar is affixed to the first end of the extension bars and a
 second hand-grip bar is affixed to a second end of the extension bars.
 When a user grasps the first hand-grip bar and pulls down, the extension
 bars pivot about the rod until the second hand-grip bar engages a wall
 surface above the doorway. The user may proceed to engage in chin-ups
 while being supported by the first hand-grip bar.
 Alternatively, the user may grasp the second hand-grip bar and pull down.
 The extension bars will pivot about the rod until the first hand-grip bar
 engages the wall surface above the doorway. The second hand-grip bar may
 then support the user while the user engages in chin-ups. The first
 hand-grip bar may be located further away from the rod than the second
 hand-grip bar. Since the first hand-grip bar and second hand-grip bar may
 be at different distances away from the rod, the height from the floor of
 a hand-grip bar may vary according to whether the user is being supported
 by the first hand-grip bar or the second hand-grip bar.

DETAILED DESCRIPTION OF THE INVENTION
 Referring now to FIGS. 1-5, the chin-up bar apparatus is designated
 generally 10. Chin-up bar apparatus 10 is designed to be installed between
 the door-jambs 12 and 14 of doorway 16 having a wall surface 19 thereabove
 (FIG. 2). Chin-up bar apparatus 10 has a rod 17 having a fixed end 18 and
 a telescoping end 20. A mount 22 is positioned on fixed end 18 of rod 17
 and a mount 24 is positioned on telescoping end 20 of rod 17. Mounts 22
 and 24 engage door-jambs 12 and 14 and may be secured to door-jambs 12 and
 14 by screws. Additionally, supports (not shown) may be secured to
 door-jambs 12 and 14 that are designed to receive mounts 22 and 24. In the
 preferred embodiment, rod 17 is made up of a rotating sleeve 26 that
 telescopically receives interior tube 28. Rod 17 may, therefore, be
 adjusted in length to accommodate various widths of doorway 16.
 In the preferred embodiment, a pair of extension bars 30a and 30b are
 clamped to exterior rotating sleeve 26 with clamps 31. Therefore,
 extension bars 30a, 30b may pivot about rod 17. Extension bars 30a, 30b
 each have a straight portion 32 and two curved ends 34 and 40. Straight
 portion 32 is secured by clamps 31 to rotating sleeve 26. In the preferred
 embodiment, clamps 31 are located closer to curved portions 40 than to
 curved portions 34.
 Preferably, short extension bar portions 36 do not extend as far from rod
 17 as long extension bar portions 37. Padded sleeves 42 may be provided on
 straight portion 32 and curved portions 34, 40 to protect the user and for
 aesthetic purposes. A first hand-grip bar 44 is affixed transversely
 between the curved ends 34 of extension bars 30a, 30b. First hand-grip bar
 44 has a first end 44a and a second end 44b, which are at 90.degree.
 relative to bar 44 and insert into curved ends 34. Preferably, a padded
 hand-grip 46 is provided on first hand-grip bar 44. Similarly, a second
 hand-grip bar 48 having a first end 48a and a second end 48b is affixed to
 curved ends 40 extension bars 30a, 30b. Preferably, a padded hand-grip 50
 is provided on second hand-grip bar 48. Hand-grip bars 44,48 are parallel
 to each other and to bar 17.
 In use, the chin-up bar of the invention is installed within a doorway 16.
 Screws may be used to secure mounts 22 and 24 to door-jambs 12 and 14. The
 chin-up bar apparatus 10 is located so that hand-grip bar 48 contacts the
 wall surface 19 above doorway 16 when tilted up as shown in FIG. 4. The
 user approaches the chin-up bar apparatus 10 and selects either the first
 hand-grip bar 44 or second hand-grip bar 48 to grasp and pull downward. If
 the user selects first hand-grip bar 44, the extension bars 30a and 30b,
 along with hand-grip bars 44 and 48 will pivot about rod 17 along with
 sleeve 26. Second hand-grip bar 48 will move up towards the ceiling and
 into engagement with a wall surface 19 above a doorway 16. When the second
 hand-grip bar 48 has engaged wall surface 19 above the doorway 16, then
 the chin-up bar apparatus 10 is in position to support a user's weight
 from the first hand-grip bar 44 (FIG. 4).
 Similarly, the user may elect to grasp the second hand-grip bar 48, which
 will pivot the extension bars 30a and 30b, along with hand-grip bars 44
 and 48 about rod 17 until the first hand-grip bar 44 engages wall surface
 19 above the doorway 16. When the chin-up bar 10 is in this position, the
 second hand-grip bar 48 is prepared to support the weight of a user. (FIG.
 3).
 If the long extension bar portions 37 and the short extension bar portions
 36 are of different lengths, the first hand-grip bar 44 is a first
 distance from a floor surface when the chin-up bar apparatus 10 is in a
 first position (FIG. 4) and the second hand-grip bar 48 is a second and
 different distance from the floor when the chin-up bar apparatus 10 is in
 a second position (FIG. 3). Therefore, the chin-up bar apparatus 10 of the
 invention can easily accommodate users of different heights by providing
 first and second hand-grip bars 44 and 48, which are two different heights
 from the floor when in position for use.
 Referring to FIG. 5, in an alternate embodiment, either or both of first
 hand-grip bar 44 and/or second hand-grip bar 48 may be of an irregular
 shape. An example includes a configuration wherein a portion of the
 hand-grip bar 44 and/or 48 are parallel to the extension bars 30a and 30b.
 For illustrative purposes, hand-grip bar 48 has been replaced with
 irregular hand-grip bar 52 in FIG. 5. Bar 52 has offset portion 54 , which
 is in the center of hand-grip bar 52 and offset from outside portions 56.
 Portions 56 are parallel to the plane of extension bars 30a and 30b in the
 preferred embodiment. An irregularly shaped hand-grip bar allows the user
 to grip the hand-grip bar in a different manner for the purpose of
 exercising different muscles. Additionally, other hand-grip bars of other
 irregular shapes besides that shown in FIG. 5 may be provided.
 In the alternate embodiment, a user may grasp offset portion 54 of
 irregularly-shaped hand-grip bar 52 (FIG. 5) to engage in a variation of
 the traditional chin-up exercise. Although an irregular shaped hand-grip
 bar 52 is shown on only one side of the chin-up bar apparatus 10, an
 irregularly shaped hand-grip bar 52 may be utilized on one or both sides
 of chin-up bar apparatus 10.
 The chin-up bar apparatus of the invention has several advantages. The
 chin-up bar enables a quick and easy change between two heights of the
 hand-grip bar to enable users of different heights to use the apparatus.
 Additionally, the chin-up bar apparatus may be easily installed within
 doorways of different widths. Further advantages are apparent from the
 preceding specification.
 Although the invention is shown in only one of its forms, it should be
 apparent to those skilled in the art that it is not so limited, but is
 susceptible to various changes without departing from the scope of the
 invention. For example, each extension bar may be formed from several
 pieces rather than an single piece. Additionally, the first hand-grip bar
 may be integrally formed with the extension bar and the second hand-grip
 bar may be integrally formed with the extension bar. Further, additional
 irregularly-shaped hand-grip bars may be utilized to further vary the
 exercises available to a user. Finally, the apparatus of the invention may
 be used for exercises other than chin-up devices and may have special
 adaptive equipment provided on the hand-grip bar to facilitate such
 exercises.