JP2730881B2 - Strength training equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muscle training apparatus, and more particularly to an improvement of a muscle training apparatus known as a crunch training machine.

[0002]

2. Description of the Related Art A crunch training machine is a muscular strength training apparatus used for muscular training of rectus abdominal muscles. In a conventional crunch training machine, as shown in FIGS. 5 to 7, a weight suspension frame 2 is suspended from one side of a substantially rectangular frame 1 placed on a floor or the like. Frame 1 facing
The seat 3 is supported on the other side so that the height can be adjusted, and a crank arm 7 extending to the seat 3 side via a shaft 6 is rotatably supported on a reinforcing member 5 adjacent to the frame 2 so as to be rotatable. Further, a footrest 8 is supported in front of the seat 3 so as to be adjustable in height from the frame 1. The footrest 8 is a footrest 8a,
8a and bars 8b, 8b with which the instep of the foot abuts are supported horizontally. Note that the seat 3 is also provided with footrests 8c, 8c.

The crank arm 7 has a balance weight 9 at a lower end thereof and a pair of chest pads 10 at an upper end thereof which are spaced apart from each other. The crank arm 7 is loosely fitted to the shaft 6, and a plate 11 is fixed to the shaft 6. By inserting and removing pins from the plate 11, the crank arm 7 and the shaft 6 can be integrally fixed at an appropriate angle. A cam 12 that rotates in the weight suspension frame 2 is mounted on the shaft 6. This cam 12 has a wire rope 13 at its base.
The wire rope 13 moves along the shape of the cam so that a weight 15 having a desired weight connected to the wire connecting tool 14 connected to the other end.
Can be raised or lowered.

[0004] A person who exercises strength with this crunch training machine adjusts the height of the seat as appropriate, sits down, adjusts the height of the footrest appropriately, fixes both feet, puts the chest on the chest pad, and moves forward. Exercise to bow.

[0005]

However, according to the above-mentioned conventional crunch training machine, since the rotation axis (shaft 6) of the crank arm 7 is located beside the waist of the seated trainer, the rotation of the chest pad 10 is prevented. The trajectory of the movement became an arc, and the trajectory of the movement pushed the chest pad toward the front of the body, making it impossible to effectively train the desired rectus abdominal muscle.

Accordingly, the present invention is directed to improving a crunch training machine in order to solve the above problems.

[0007]

According to the present invention, there is provided a muscular strength training apparatus in which a frame is pivotally mounted on a frame such that a breast pad located at the front of the seat is fixed at one end and a crank arm having a balance weight fixed at the other end. In a muscle training apparatus for supporting, a muscle training of a predetermined portion is performed by rotating the chest pad downward against a selected load of a weight that can be raised and lowered in a weight suspension frame near the frame, By placing the center of rotation of the crank arm behind the seat and using the chest pad as a round pad and increasing the distance between the pad and the center of rotation of the crank arm, the rotation trajectory of the chest pad is substantially linear. It is characterized by being in a state close to.

Therefore, the center of rotation of the crank arm is located behind the seat, that is, the person who sits and trains, so that the center of rotation of the chest pad and the crank arm can be made large. The motion trajectory can be formed almost linearly, and can be moved linearly downward so as to involve the round pad.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4, a weight suspension frame 21 is erected on one side of a substantially rectangular frame 20 placed on a floor or the like.
The seat 22 is arranged so that the height of the seat 22 can be adjusted, and the support body 20 a
The crank arm 23 is rotatably supported on the
A footrest 24 is supported on the frame 20 at a predetermined height.

The weight suspension frame 21 is not substantially different from the conventional example, and a plurality of weights 25 are inserted into a pair of guide rods 24, 24 vertically suspended in a rectangular frame so as to be able to move up and down. The weight connecting tools 26 for selecting and connecting the desired number of weights 25 are both guide rods 24,
One end of a wire rope 27 is connected to the weight connecting tool 26 so as to be able to ascend and descend along the wire 24. The other end of the wire rope 27 is the weight suspension frame 2
The upper part 1 extends to the outside via the pulley part 28, and is rotatably connected to the elbow part of the crank arm 23 by a connecting tool 27a.

One end of the crank arm 23 is attached to the seat 22.
, A chest pad 29 is attached to the part, a balance weight 30 is connected to the other end, and a shaft 31 is orthogonally connected to the middle part. The shaft 31 is supported on the support 20a. Therefore, when the chest pad 29 is depressed, the crank arm 23
Is rotated about the shaft 31 in the vertical direction, and when it is rotated downward, the load of the weight 30 is applied.

The seat 22 has a square pipe 32 attached to the frame 20.
And a square tube 3 fitted in the square pipe 32 in the axial direction.
The seat pad 36 is horizontally fixed to a substantially L-shaped bone rod 35 whose height can be adjusted by adjusting the expansion and contraction of the lumbar support 37 with a tightening screw 34, while the lumbar support 37 is adjustable with a screw 38 so that it can be moved back and forth. It can be fixed. The footrest 24 is formed by projecting bars 24a on the left and right facing the seat 22 in several stages in the vertical direction, so that both feet can be hung on the bar 24a having an appropriate height.

An explanation plate 40 for explaining the method of use is stretched on the upper part of the weight suspension frame 21, and a resin cover 41 surrounding the weight 25 is mounted on the lower part. Further, a protective fence 39 of the balance weight 30 is provided at a rear portion of the support 20a.

Next, the operation of the above embodiment will be described. In order to perform crunch training, the user sits on the seat 22 with the height of the seat 22 adjusted and the position adjusted on the lumbar support. If you lean forward while holding the pad 29, the crank arm 2
3 is loaded with the weight of the set weight by rotating forward about the shaft 31.

The shaft 31 which is the center of rotation of the crank arm 23 is disposed behind the seat 22 and the distance from the shaft 31 to the pad 29 can be increased. Draws a circular arc larger than that of the related art, and has a locus close to a straight line. Therefore, it is possible to exercise the chest pad 29 in such a manner that the pad 29 is rolled down linearly, and it is possible to concentrate the rectus abdominal muscles.

[0016]

According to the present invention described above, the center of rotation of the crank arm is arranged behind the seat, and the chest pad is a round pad to increase the distance between the pad and the center of rotation of the crank arm. This makes it possible to make the rotation trajectory of the chest pad round nearly linear, so that training can be performed in an appropriate posture in which the pad is wound straight down, and the rotation of the crank arm can be achieved. Since the center is located behind the seat and the distance between the center of rotation of the chest pad and the crank arm is long, it is possible to move the pad so that the pad is linearly rolled downward.
You will be able to do proper and effective muscle training.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a plan view of FIG. 2;

FIG. 5 is a side view of a conventional example.

FIG. 6 is a front view of FIG. 5;

FIG. 7 is a plan view of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Frame 21 ... Weight suspension frame 22 ... Seat 23 ... Crank arm 24 ... Footrest 25 ... Weight 26 ... Weight connection tool 27 ... Wire rope 29 ... Chest pad 30 ... Balance weight 31 ... Shaft

Claims (1)

(57) [Claims] 1. A chest pad, which is located at the front of the seat at one end, and a crank arm having a balance weight fixed at the other end is rotatably supported on a frame, and a weight suspension frame in the vicinity of the frame. In a strength training apparatus for training a muscle at a predetermined portion by rotating the chest pad downward against a selected load of a weight that can be lifted and lowered, a rotation center of the crank arm is disposed behind a seat. A strength training device characterized in that the chest pad is a round pad and the distance between the pad and the center of rotation of the crank arm is increased so that the rotation path of the chest pad is substantially linear. .