Patent Application
20170189734
1. Field of the Invention
The present invention relates to an improved structure of a pull-up fitness exercise machine, and more particularly to the pull-up fitness exercise machine providing a reliable and stable operation of the whole assembly to reduce the failure rate and assure the safety of use.
2. Description of the Related Art
As disclosed in U.S. patent application Ser. No. 4/622,932 entitled “Pull-up fitness exercise machine” and filed by the inventor of the present invention, an innovative product having a support plate situated at a low static position was disclosed, such that a user may step on the support plate or step down from the support plate easily to carry out the expected exercise. The technical characteristics of related mechanism and design have been disclosed clearly in the specification of the patent application, and thus will not be repeated. The present invention further improves the previous patent application, since the previous patent application uses a linking rope to release the latched status of the support plate, but the linking rope may be broken after being used for a period of time, and this may jeopardize the user's safety. Therefore, it is necessary to prevent such accident and improve the conventional pull-up fitness exercise machine.
In addition, the previous patent application simply uses the linking rope and the linking hook lever to lock the support plate to a low static position. If any component fails, the user's safety will be jeopardized as well, and the intended technical characteristics of the conventional pull-up fitness exercise machine become ineffective and useless.
Therefore, it is a primary objective of the present invention to provide a pull-up fitness exercise machine that replaces the rope by a linking hook lever linked with a cantilever to reduce the chance of breaking the rope or causing accident. In the meantime, a manual hook assembly is installed between the support plate and the base to provide a secondary safety device and improve the safety of use.
According to the invention, a pull-up fitness exercise machine includes a base, a cantilever, a cantilever aligning unit, a pulling and latching unit, an assisted pushing unit, a limit assembly and a support plate. At a low static position, the support plate is acted by the limit assembly and fixed to a bottom position of the base, such that only after a specific gravitational force is exerted onto the support plate, and the cantilever is pulled downward, the support plate is released from a locked status. In addition, a central column at the bottom of the base has an inverted hook member operating together with a circular ring installed at a corresponding position of the support plate to form a secondary safety device to prevent the support plate to have any unexpected lifting movement and ensure the safety of use.
The technical measures and characteristics of the present invention will become clearer in light of the following detailed description of an illustrative embodiment of this invention described in connection with the drawings.
With reference to
The base 10 is attached flatly on the ground, and includes a hollow upright column 11 disposed on a side of the base 10 and provided for inserting a linking hook lever 21 at a lower end of the cantilever 20, and a first pivot 12 is provided for pivoting with the cantilever 20.
The cantilever 20 has an upper end pivotally coupled to a fork 23 by using two cantilever pivots 22 and provided for installing a pulling and latching unit 40, and a lower end of the cantilever 20 is a linking hook lever 21.
The cantilever aligning unit 30 is installed at a guide slot 13 formed on a side of the upright column 11, and includes an oblique support rod 31, a position adjusting lever 32 and a pneumatic rod 33 pivotally coupled to the cantilever 20.
The pulling and latching unit 40 is installed between the fork 23 and the support plate 70 and includes a pull handle 41, a pull string 42 and a plurality of pulleys 43, for driving the support plate 70 to displace in upper and lower strokes.
The assisted pushing unit 50 is pivotally coupled to the bottom of the base 10 and includes a resistance adjusting mechanism 51 and a spring pneumatic cylinder 52 for providing a lifting force to the support plate 70, and the lifting force is adjustable freely.
The limit assembly 60 is comprised of a hook plate 61 pivotally coupled to the bottom of the linking hook lever 21, an assisted hook lever 62 linked to the assisted pushing unit 50, and an elastic member 63 installed at the bottom of the base 10, and the hook column 64 of the hook plate 61 operated with the corresponding hook hole 65 of the assisted hook lever 62 forms a hook action, so that the support plate 70 can be positioned securely at a low static position.
The support plate 70 is pivotally coupled to the support plate 72 by using two side bars 71, and the other end of the two side bars 71 is pivotally coupled to a second pivot 14 of the base 10, and a coupling lever 73 is provided for pivotally coupling and linking the support plate 72 to the resistance adjusting mechanism 51.
When the support plate 70 is situated at a low static position, the support plate 70 is acted by the limit assembly 60 and fixed to a bottom position of the base 10, such that only after a specific gravitational force is exerted onto the support plate 70 and the cantilever 20 is pulled downward, the linking hook lever 21 displaces sideway slightly by using the first pivot 12 as a fulcrum to drive the hook plate 61 to rotate appropriately by using a swivel 66 as the fulcrum, so that the hook column 64 is separated from the corresponding hook hole 65 of the assisted hook lever 62 before the support plate 70 can be released from its locked status and used successfully by a user. After the external force is released, the elastic member 63 pulls the linking hook lever 21 and its hook plate 61 back to their original positions.
With reference to
In
Since the control mode and basic function of the assisted pushing unit 50 are similar to those of the prior art, therefore they will not be described in details.
In
Many changes and modifications in the above-described embodiments of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims.
