Multifunctional muscle exerciser

Disclosed is a multifunctional muscle exerciser comprising two handles (1, 2). The two handles (1, 2) each comprise a connection end (1a, 2a) and a grip end (1b, 2b). A torsional spring (3) is connected between the connection ends (1a, 2a) of the two handles (1, 2). The torsional spring (3) is composed of stacked multichip spring steel pieces (31). The two ends of the multichip spring steel pieces (31) are respectively connected via fasteners. Preferably, both of the two handles (1, 2) are U-shaped. The connection ends (1a, 2a) of the two handles (1, 2) are coaxially arranged. The grip ends (1b, 2b) of the two handles (1, 2) are in parallel but are not on the same straight line.

TECHNICAL FIELD

The present invention relates to fitness equipment, in particular to a multifunctional muscle exerciser which is mainly used for exercising muscles of arms, chest and shoulders.

BACKGROUND OF THE PRESENT INVENTION

At present, a wide variety of fitness equipment for exercising muscles is present on the market, but basically can be classified into two categories, in which one uses the weight of an instrument to provide resistance; and the other uses a spring to provide the resistance. The existing arm exercisers using the springs to provide the resistance all adopt ordinary steel wire coil springs; due to limit of spring indexes (wire-diameter ratios) of the coil springs, when relatively great resistance needs to be provided, volumes of the coil springs may become relatively large, causing that the fitness equipment is relatively large in volume or relatively heavy in weight, thereby not only increasing manufacturing cost, but also resulting in inconvenience in storage and carrying.

In addition, most of the existing arm exercisers have a single function and is hard to achieve an effect of comprehensive exercise. Some arm exercisers having multiple functions often are manufactured by simply combining several different instruments, resulting in not only use inconvenience, but also reliability reduction.

For example, the China utility model patent CN203663337U discloses a multifunctional arm exerciser which can be used as an arm exerciser for exercising arm strength and can also be used as a chest expander for exercising chest muscles. The multifunctional arm exerciser comprises grip handles and first springs; sleeves with external threads are respectively fixed at both ends of the first springs; the grip handles arranged on the left and right are detachably arranged at both ends of the first springs for bearing bending moment through the threads, respectively, and constitute the arm exerciser; several annular first connection rings with buckle structures are respectively arranged on the two handles in a length direction; after removing the first springs from the two grip handles, a plurality of second springs sleeved inside the first springs are drawn out, and both ends of the second springs are connected with the opposite first connection rings on the two grip handles through annular second connection rings, so that the two grip handles and the second springs constitute the chest expander. In the patent, the coil springs are used as resistance elements, so large volume, security risk and other shortcomings also exist. In addition, when the multifunctional arm exerciser changes functions, the springs need to be disassembled and assembled again, causing use inconvenience.

For another example, the China utility model patent CN203220727U discloses a multifunctional arm exerciser which comprises an intermediate section spring, handles on both sides, and a protection rope; coiled opening-angle springs are connected to top ends of the handles on both sides; the other end of the coiled opening-angle springs are connected with handles of a grip exerciser; and the multifunctional arm exerciser can be used as an arm exerciser for exercising arm strength, and can also be used as the grip exerciser composed of the handle at one end, the spring and the handles, for exercising grip strength. Although the protection rope is arranged for improving security in the patent, other defects brought by the coiled springs still cannot be overcome. Moreover, the arm exerciser may also cause use inconvenience in such a manner that the grip exerciser is added on the handles.

SUMMARY OF PRESENT INVENTION

A technical problem to be solved by the present invention is to provide a multifunctional muscle exerciser which is small in volume, large in torsional force and good in security.

In order to solve the above technical problem, the present invention adopts the following technical solution: the multifunctional muscle exerciser comprises two handles; the two handles each comprise a connection end and a grip end; a torsional spring is connected between the connection ends of the two handles; the torsional spring is composed of a plurality of stacked spring steel pieces; and both ends of the plurality of spring steel pieces are respectively connected via fasteners.

Preferably, the handles are molded by engineering plastics.

Preferably, the connection ends of the two handles are provided with notches; and end parts of the spring steel pieces are clamped in the notches and are fixedly connected to the connection ends of the two handles via the fasteners.

Further, the handles are made of pipes having inner holes; a spring fixing base is fixed in each of the inner holes of the two handles; and the notch is disposed in the spring fixing base.

Preferably, the two handles are U-shaped; connection ends of the two handles are coaxially arranged; and the grip ends of the two handles are arranged side by side.

More preferably, one end of the torsional spring is fixedly connected with the connection end of one handle, and the other end is fixedly connected with a spring clamping base; a spline sleeve is fixedly arranged at the connection end of the other handle; a section of spline shaft is arranged on the spring clamping base; and the spline shaft is matched with the spline sleeve.

Compared with the existing art, the present invention has the following beneficial effects:

(1) In the present invention, the torsional spring composed of a plurality of spring steel pieces is adopted, and has advantages of small size, light weight and convenient fixation of both ends.

(2) The torsional spring has large elastic force.

(3) Two U-shaped handles are adopted; as long as an angle between the two handles is set reasonably or a distance between the grip ends of the two handles is set reasonably, the multifunctional muscle exerciser can be both clamped and stretched. When the angle between the two handles is reduced, the multifunctional muscle exerciser can be used as a chest expander; and when the angle between the two handles is increased, the multifunctional muscle exerciser can be used as a “press device” or a grip exerciser.

(4) A structure for matching the spline shaft with the spline sleeve is adopted, so that the angle between the two handles is adjustable; not only functions of the multifunctional muscle exerciser and the grip exerciser can be easily realized, but also the torsional force can be easily adjusted, so as to realize a variety of exercise forms for exercising different muscle groups.

(5) The whole instrument is relatively light in weight, comfortable and secure in use, foldable and portable.

A LIST OF REFERENCE NUMERALS

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Specific embodiments of the present invention are further described in detail below in combination with drawings. These embodiments are merely used for illustrating the present invention, rather than limiting the present invention.

In description of the present invention, it should be noted that a directional or positional relationship indicated by terms such as “left”, “right”, “inner” and “outer” is the directional or positional relationship shown based on the drawings, and is merely used for facilitating the description of the present invention and simplifying the description, rather than indicating or implying that referred apparatuses or elements must have a particular direction and must be constructed and operated in a particular direction, so as not to be construed as a limitation to the present invention.

In addition, in the description of the present invention, unless otherwise stated, “a plurality of” means two or more.

As shown inFIG. 1, a multifunctional muscle exerciser of the present invention comprises left and right handles1and2; two handles1and2each comprise a connection end1a,2aand a grip end1b,2b; the handles1and2in the present embodiment are made of metal pipes having inner holes, e.g., made of steel pipes or aluminum alloy pipes, wherein a torsional spring3is connected between the connection ends1aand2aof the two handles; and the torsional spring3can provide torsional resistance when the grip ends1band2bof the two handles are gripped by both hands and are rotated in opposite directions, so as to exercise torsional force of both arms.

As shown inFIG. 2, the torsional spring3of the present invention is formed by stacking a plurality of spring steel pieces31up and down; both ends of the spring steel pieces31are provided with through holes3a; and the spring steel pieces can be connected together through rivets, bolts or other fasteners. When torque is applied to both ends of the torsional spring3through the handles, the torsional spring3can provide relatively large elastic force and is small in volume and light in weight.

With reference toFIG. 1toFIG. 3, for the convenience of fixing both ends of the torsional spring3in the inner holes of the handles1and2, one spring fixing base32is arranged at each of both ends of the torsional spring3; notches32aand through holes32bperpendicular to the notches are disposed in the spring fixing bases32; and when end parts of the spring steel pieces are clamped in the notches32a, the through holes32band through holes3ain the end parts of the spring steel pieces can be penetrated by the rivets or the bolts, so that the spring steel pieces are fixed on the spring fixing bases32. The spring fixing bases32are fixedly connected with the connection ends1aand2aof the handles, so that the torsional spring3is connected between the connection ends1aand2aof the two handles. For example, fixing holes32din the spring fixing bases32can be penetrated by the rivets or the bolts, so that the spring fixing bases32are fixed in the handles, and certainly can also be fixed in a welding manner, a bonding manner or other well-known manners.

As shown inFIG. 3andFIG. 4, in a preferred embodiment of the present invention, each of the handles1and2is formed by a circular pipe; the spring fixing bases32are also cylindrical and are located in the inner holes of the handles; two convex ribs1care arranged on inner walls of the circular pipes; and grooves32cmatched with the convex ribs1care disposed in cylindrical surfaces of the spring fixing bases32. The convex ribs1ccan be matched with the grooves32c, so as to connect the spring fixing bases32with the handles1and2more reliably and also play a role of transmitting the torque.

Also with reference toFIG. 1, end surfaces of the connection ends1aand2aof the two handles are brought close to each other; only a small gap is reserved between the end surfaces, so that the torsional spring3is integrally accommodated in the inner holes of the two handles; except that both ends of the torsional spring3are connected with the handles1and2, the other parts are unrestricted and can be freely subjected to torsional deformation. Preferably, a section of sleeve4is further included and sleeved outside the connection ends1aand2aof the two handles; and the sleeve4can play a role of shielding the gap between the connection ends1aand2aof the handles and protecting the torsional spring3, so that the multifunctional muscle exerciser of the present invention is more secure. The sleeve4can be fixed on the connection end of one handle. Further, a liner pipe5is arranged between the inner wall of the sleeve4and an outer wall of the connection end of the handle; the liner pipe5is made of a material with a low friction coefficient, and can be fixed on the inner wall of the sleeve4or the outer wall of the connection end of the handle; and the liner pipe5can prevent the inner wall of the sleeve4from directly contacting the outer wall of the connection end of the handle, thereby reducing friction.

As shown inFIG. 5andFIG. 6, in Embodiment 2 of the present invention, both handles1and2are U-shaped; the connection ends1aand2aof the two handles are coaxially arranged; the grip ends of the two handles1band2bare arranged side by side, i.e., from a front view, as shown inFIG. 5, the grip ends1band2bof the two handles are overlapped with each other in a certain length, but are separated by a certain distance in front and back in a free state; and from a side view, as shown inFIG. 10, an angle is formed between the two handles1and2. A structure of the torsional spring3and a connection relationship between the torsional spring3and the two handles in the present embodiment are the same as those in Embodiment 1. Other structures, such as the sleeve4and the liner pipe5, may also be arranged in the same manner as that in Embodiment 1.

Lengths of the two handles1and2are substantially equivalent; since the grip ends1band2bof the two handles are arranged side by side, the distance between the grip ends1band2bof the two handles can be further increased or reduced in a push-pull manner after the grip ends are gripped by both hands, or the angle between the two handles1and2can be changed manually, so that the torsional spring3produces elastic force to achieve a purpose of exercising push and pull force of both arms.

As shown inFIG. 7toFIG. 9, similar to Embodiment 2, two U-shaped handles and a laminated torsional spring are also adopted in the present embodiment; and the two handles are also formed by bending a circular pipe, but a connection manner of the torsional spring and the two handles in the present embodiment is not the same as that in Embodiment 2.

As shown inFIG. 7, in the present embodiment, a spring fixing base32is fixed at one end of the torsional spring3; the spring fixing base32is the same as those in the above two embodiments; a spring clamping base33is fixed at the other end of the torsional spring3; like the spring fixing base32, a notch33ais also disposed in the spring clamping base33; and one end part of the spring steel piece is clamped in the notch33aand is fixed on the spring clamping base33through the rivet, the bolt or other fasteners. A section of spline shaft33bis further arranged on the spring clamping base33; and external spline teeth are arranged on the spline shaft33b.

As shown inFIG. 8, the spring fixing base32is fixed in a left handle1; a spline sleeve34is arranged in the connection end2aof a right handle2; an internal spline tooth is arranged in the spline sleeve34; the spline shaft33bon the spring clamping base can be inserted into the spline sleeve34and is matched with the spline sleeve34through a spline (this state is hereinafter referred to as the two handles are in a closed state); and in a process of using the multifunctional muscle exerciser, the spline cooperates to play a role of transmitting the torque. Two convex ribs (see1cinFIG. 4) can also be arranged on the inner walls of the two handles; and grooves matched with the convex ribs are also arranged on cylindrical surfaces of the spring fixing base32and the spline sleeve34. The convex ribs are matched with the grooves, so as to connect the spring fixing base32, the spline sleeve34and the handles1and2more reliably, and also play a role of transmitting the torque.

When the left handle1is pulled and the connection end1aof the left handle is moved outward (leftward) relative to the connection end2aof the right handle2, the torsional spring3can be driven to move outward together with the spring clamping base33at the end of the torsional spring, so that the spline shaft33bis separated from the spline sleeve34(this state is hereinafter referred to as the two handles are in an open state), and the left handle1is free to rotate relative to the right handle2. If the spline shaft33bis reinserted into the spline sleeve34after the left handle1is rotated at an angle relative to the right handle2, an initial distance between the grip ends1band2bof the two handles can be easily adjusted, or an initial (in a free state) angle between the two handles1and2is adjusted, e.g., from a relatively small angle α shown inFIG. 10to a relatively large angle β shown inFIG. 11, or from the relatively large angle β to the relatively small angle α.

The initial angle between the two handles1and2is changed. The force to be applied by both arms may also be changed when the multifunctional muscle exerciser is used. Therefore, the multifunctional muscle exerciser in the present embodiment can adjust the torque conveniently.

In addition, when the initial distance between the grip ends1band2bof the two handles (or the initial angle between the two handles1and2) is relatively appropriate, the grip ends1band2bof the two handles can be gripped by one hand at the same time; and therefore, the multifunctional muscle exerciser in the present embodiment can also be used as a grip exerciser, and thus has multiple functions.

As shown inFIG. 7toFIG. 9, the end of the spline shaft33bextends forward to form a section of guide shaft33con the spring clamping base33; the diameter of the guide shaft33cis smaller than that of a tooth root circle of the spline shaft33b; and a guide hole matched with the guide shaft33cis disposed in the spline sleeve34. After the spline shaft33bis separated from the spline sleeve34, the guide shaft33cremains in the spline sleeve34; and when the spline shaft33bis reinserted into the spline sleeve34, the guide shaft33ccan play a role of guiding, so that the spline shaft33bcan be inserted into the spline sleeve34easily.

As shown inFIG. 7andFIG. 12, a more optimized structure further comprises an insertion positioning mechanism arranged between the guide shaft33cand the handles; one or more annular grooves33dare disposed in the cylindrical surface of the guide shaft33c; a jacking bead34bis arranged in the connection end2aof the handle (e.g., on the spline sleeve34) along a radial direction; the jacking bead34bis in contact with the spring34a; under the action of the spring34a, part of a spherical surface of the jacking bead34bmay be protruded from the inner wall of the guide hole. When the spline shaft33bis partially matched with the spline sleeve34, i.e., when an external spline tooth on the spline shaft33band an internal spline tooth of the spline sleeve34are meshed with each other in partial length, the jacking bead34bcan slide along the cylindrical surface of the guide shaft33c; when the spline shaft33bis completely matched with the spline sleeve34, i.e., when the external spline tooth on the spline shaft33band the internal spline tooth of the spline sleeve34are meshed with each other in full length, the jacking bead34bis just clamped into the annular groove33dto realize positioning, i.e., the annular groove33dand the jacking bead34bconstitute the insertion positioning mechanism. A user can know whether the jacking bead34bis clamped into the annular groove33dby a hand feel, to determine whether the spline shaft33bis completely matched with the spline sleeve34, to avoid damaging the spline shaft33bor the spline sleeve34due to the use of the multifunctional muscle exerciser when the spline shaft33bis partially matched with the spline sleeve34.

As shown inFIG. 8andFIG. 9, in the present embodiment, the sleeve4can also be arranged outside the connection ends1aand2aof the two handles; one end of the sleeve4is fixed at the connection end of one handle; the liner pipe5can also be arranged between the inner wall of the sleeve4and the outer wall of the connection end of the other handle. The sleeve4and the liner pipe5also each have functions described in Embodiment 1; and meanwhile, the sleeve4and the liner pipe5in the present embodiment are also used to constitute a limiting mechanism between the two handles. When the connection ends1aand2aof the two handles are separated by a distance and the spline shaft33bis completely separated from the spline sleeve34, the limiting mechanism is used for preventing the connection ends1aand2aof the two handles from continuing to be separated, thereby avoiding that the two handles are completely separated during use and ensuring integrity and use security of the multifunctional muscle exerciser of the present invention. As shown inFIG. 8, the liner pipe5is fixed at the connection end2aof the right handle2; an outer diameter of the liner pipe5is greater than that of the connection end2aof the right handle; however, a left end of the sleeve4is fixed on the connection end1aof the left handle; a right end of the sleeve4extends to outside of the connection end2aof the right handle2; a baffle ring41is fixed at the right end of the sleeve4; an inner diameter of the baffle ring41is smaller than the outer diameter of the liner pipe5; when the connection ends of the two handles are separated by a certain distance, the spline shaft33bis completely separated from the spline sleeve34; at this moment, a right end surface of the liner pipe5is in contact with the baffle ring41, so that the connection ends of the two handles cannot be separated continuously, i.e., the liner pipe5constitutes a protrusion part, and the liner pipe5and the baffle ring41at the end part of the sleeve4constitute the limiting mechanism.

The present embodiment is an improvement of Embodiment 3, and can comprise all structures described above in Embodiment 3. On the basis of Embodiment 3, in the present embodiment, an angle limiting mechanism is added between the two handles; functions of the angle limiting mechanism are that when the angle between the two handles in the free state is in a certain range (e.g. 30-150 degrees) and the two handles are extruded in a left-right direction, the two handles can be changed from the open state to the closed state, i.e., a state that the spline shaft33bis meshed with the spline sleeve34(seeFIG. 8); but when the angle between the two handles in the free state exceeds a preset value (e.g. 150 degrees), the two handles cannot be changed from the open state to the closed state even if the two handles are extruded forcibly from the left-right direction to the middle, i.e., the connection ends of the two handles cannot get close enough, causing that the spline shaft33bcannot be inserted into the spline sleeve34; the two handles can only be idled relatively at this moment; and the multifunctional muscle exerciser cannot be used normally.

As described in Embodiment 3, the initial angle between the two handles of the multifunctional muscle exerciser is adjustable. However, if the user adjusts the initial angle between the two handles to a large value (e.g. close to 180 degrees), the torsional spring may be greatly deformed and produce large elastic force in a process of using the multifunctional muscle exerciser, which may cause slipping-off due to grip difficulty, or cause damage to the torsional spring or other components, and further pose risks to the user. Therefore, in the present embodiment, the angle limiting mechanism is arranged to better ensure the security of the multifunctional muscle exerciser and the user. The angle limiting mechanism is composed of an outer gear ring and an inner gear ring; convex teeth and tooth grooves matched with each other are arranged between the outer gear ring and the inner gear ring; the convex teeth comprise at least one special convex tooth; the tooth grooves comprise at least one special tooth groove; and the special convex tooth may be inserted into other tooth grooves other than the special tooth groove.

As shown inFIG. 13andFIG. 14, the sleeve4is fixed on the right handle2; the inner gear ring7is fixed at the left end of the sleeve4; the outer gear ring6is fixed on the left handle1; a plurality of convex teeth61are uniformly arranged along an outer circumference on the outer gear ring6; and as shown inFIG. 15, these convex teeth comprise at least one special convex tooth61a. As shown inFIG. 16, a plurality of tooth grooves71are uniformly arranged along an inner circumference on the inner gear ring7; these tooth grooves comprise at least one special tooth groove71a, and the special convex tooth61acan be inserted into other tooth grooves other than the special tooth groove71a. The number of teeth of the inner gear ring7is the same as that of the outer gear ring8, and is set as N; the number of teeth of the spline shaft33bis also the same as that of the spline sleeve34, and is set as n; and N is equal to n, or N is an integral multiple of n.

In addition, as shown inFIG. 13andFIG. 14, the inner gear ring7may be integrally formed at the left end of the sleeve4as a part of the sleeve4, or may be fixed at the left end of the sleeve4as an independent member; and the baffle ring41mentioned in Embodiment 3 may also be formed inside the inner gear ring7.

InFIG. 15toFIG. 18, twelve convex teeth and twelve tooth grooves are provided, wherein two special convex teeth61aare provided and are arranged adjacent to each other; and two special tooth grooves71aare also provided and are arranged adjacent to each other. However, it is apparent that the number of the convex teeth and the number of the tooth grooves are not limited to twelve; and the number of the special convex teeth61aand the number of the special tooth grooves71aare not limited to two. Widths of all the convex teeth (including the special convex teeth) are the same, but heights of the special convex teeth61aare greater than those of the other convex teeth; the widths of all the tooth grooves (including the special tooth grooves) are the same, and are greater than the widths of the convex teeth; a certain amount of clearance is reserved on both sides during matching, to ensure that the spline shaft33bcan be smoothly meshed with the spline shaft34in the free state of the torsional spring3when the outer gear ring6is meshed with the inner gear ring7. But, the depths of the special tooth grooves71aare slightly smaller than those of the other tooth grooves; the depths of the special tooth grooves71amake the special convex teeth61afail to pass, but allow the other convex teeth to pass smoothly.

As shown inFIG. 17, when the positions of the special convex teeth61aand the special tooth grooves71ado not coincide in a circumferential direction, all the convex teeth can pass through the tooth grooves, so that the two handles can be changed from the open state to the closed state, and the multifunctional muscle exercises can work properly. As shown inFIG. 18, as long as positions of one special convex tooth61aand one special tooth groove71aare overlapped in the circumferential direction, the connection ends of the two handles cannot get close since the depth of the special tooth groove71amakes the special convex tooth61afail to pass; and the spline shaft33bcannot be inserted into the spline sleeve34so that the two handles cannot be changed to the closed state, and the multifunctional muscle exerciser cannot work properly. Therefore, as long as the positions of the special convex teeth61aand the special tooth grooves71aare appropriately set so that the angle between the two handles in the free state exceeds a preset value, and the positions of the special convex teeth61aand the special tooth grooves71aare overlapped in the circumferential direction, the purpose of limiting the angle between the handles can be achieved.

As described above, when the two handles are changed from the open state to the closed state, the spline shaft33band the spline sleeve34(seeFIG. 8) start to be matched in partial length at first, and if there is no restriction measure, and torque is applied to the two handles at this moment, the spline shaft33bor the spline sleeve34may be damaged. To avoid this situation, relative positions of the outer gear ring6and the inner gear ring7in an axial direction may be set in such a manner that the outer gear ring6and the gear ring7are also in a separated state (as shown inFIG. 19a) when the spline shaft33bis completely separated from the spline sleeve34, and the convex teeth61start to be inserted into the tooth grooves71when the outer gear ring6starts to enter the inner gear ring7(as shown inFIG. 19b), and then, the spline shaft33band the spline sleeve34start to be meshed in partial length; at this moment, if the torque is applied to the two handles, since the convex teeth61and the tooth grooves71are mutually limited, the two handles are stuck with each other, the multifunctional muscle exerciser cannot work properly, to avoid possible damage since the spline shaft33bor the spline sleeve34is used when the meshing length is too short; therefore, the angle limiting mechanism further has a function of protecting the spline shaft33bor the spline sleeve34, besides the function of limiting the angle between the handles; when the spline shaft33bis completely matched with the spline sleeve34, the outer gear ring6also completely enters the inner gear ring7(as shown inFIG. 19c); at this moment, the convex teeth61have passed over the tooth grooves71and are separated from the tooth grooves71; the convex teeth61and the tooth grooves71are no longer limited to each other; the two handles can rotate relatively; and the multifunctional muscle exerciser can work properly.

As shown inFIG. 20, the angle limiting mechanism is arranged in another manner that the sleeve4is still fixed on the right handle2, but the positions of the outer gear ring6and the inner gear ring7are interchanged, i.e., the outer gear ring6is fixed at the left end of the sleeve4, and the inner gear ring7is fixed on the left handle1; the convex teeth on the outer gear ring6and the tooth grooves in the gear ring7are still provided in the same manner; and the functions of the angle limiting mechanism can also be realized in this manner. The advantage of this manner is that the outer diameter of the inner gear ring7can be reduced, thereby reducing the volume of the entire multifunctional muscle exerciser.

As shown inFIG. 21andFIG. 22, the multifunctional muscle exerciser in the present embodiment comprises left and right handles1and2; the two handles1and2each comprise a connection end1a,2aand a grip end1b,2b; a torsional spring3is connected between the connection ends1aand2aof the two handles; and the structure of the torsional spring3is the same as that of Embodiment 1. Unlike the Embodiment 1, the two handles1and2in the present embodiment are made of engineering plastics; the notches32afor clamping the torsional spring3can be directly formed in the connection ends1aand2aof the two handles in a molding manner; and therefore, in the present embodiment, an independent spring fixing base is not required to be provided. Both ends of the torsional spring3clamped in the notches32acan also be fixed on the two handles by rivets or screws.

As shown inFIG. 23andFIG. 24, in Embodiment 6 of the present invention, the two handles1and2have shapes same as those in Embodiment 2 and are U-shaped; but the two handles1and2are directly molded by engineering plastics. In the present embodiment, the structure of the torsional spring3and the connection relationship between the torsional spring3and the two handles are the same as those in Embodiment 5.

As shown inFIG. 25toFIG. 27, similar to Embodiment 6, the two U-shaped handles and the laminated torsional spring are also adopted in the present embodiment; and the two handles are directly molded by engineering plastics. However, the connection manner between the torsional spring and the two handles in the present embodiment is different from that in Embodiment 6.

As shown inFIG. 25, one end of the torsional spring3is directly fixed in the connection end1aof the left handle; a spring clamping base33is fixed at the other end of the torsional spring3; the notch33a(seeFIG. 27) is disposed in the spring clamping base33; and the other end of the torsional spring3is clamped in the notch33aand is fixed on the spring clamping base33through rivets, bolts or other fasteners.

As shown inFIG. 27, the structure of the spring clamping base33is the same as that in Embodiment 3; a section of spline shaft33bis also arranged on the spring clamping base; and external spline teeth are arranged on the spline shaft33b. The end of the spline shaft33bfurther extends forward to form a section of guide shaft33c; and the diameter of the guide shaft33cis smaller than that of a tooth root circle of the spline shaft33b. Functions of the guide shaft33care the same as those in Embodiment 3.

As shown inFIG. 25, the spline sleeve34is arranged in the connection end2aof the right handle2; and the spline sleeve34is also directly formed in the connection end2aof the right handle2in a molding manner. The spline shaft34is provided with internal spline teeth; the spline shaft33bon the spring clamping base can be inserted into the spline sleeve34and is matched with the spline sleeve34through a spline; and the matching function and the use manner of the spline are the same as those in Embodiment 3.

As shown inFIG. 28toFIG. 30, Embodiment 8 is an improvement of Embodiment 7, and may comprise all the structures described above in Embodiment 7. On the basis of Embodiment 7, in the present embodiment, the angle limiting mechanism is added between the two handles; and functions of the angle limiting mechanism are the same as those in Embodiment 4. The angle limiting mechanism is also composed of an outer gear ring and an inner gear ring; and the convex teeth and the tooth grooves matched with each other are arranged between the outer gear ring and the inner gear ring; these convex teeth comprise at least one special convex tooth; these tooth grooves comprise at least one special tooth groove; and the special convex tooth can be inserted into other tooth grooves other than the special tooth groove.

As shown inFIG. 28andFIG. 29, the sleeve4is integrally formed on the right handle2in a molding manner and extends forward (leftward) from the connection end of the right handle; the inner gear ring7is integrally formed at the left end of the sleeve4; the outer gear ring6is integrally formed on the left handle1in a molding manner; and a plurality of convex grooves62are uniformly formed along the outer circumference on the outer gear ring6. As shown inFIG. 32, these tooth grooves comprise at least one special tooth groove62a. As shown inFIG. 33, a plurality of convex teeth72same as the tooth grooves in number are uniformly arranged along the inner circumference on the inner gear ring7; these convex teeth comprise at least one special convex tooth72; and the special convex tooth72can be inserted into other tooth grooves other than the special tooth groove62a.

InFIG. 32toFIG. 35, fifteen convex teeth and fifteen tooth grooves are provided, wherein three special convex teeth72are provided and are arranged adjacent to each other; two special tooth grooves62aare provided and are arranged adjacent to each other. The widths of all the convex teeth (including the special convex teeth) are the same, but the heights of the special convex teeth72aare slightly greater than those of other convex teeth; the widths of all the tooth grooves (including the special tooth grooves) are the same and are greater than those of the convex teeth, but the depths of the special tooth grooves62aare slightly smaller than those of other tooth grooves; and the depths of the special tooth grooves62amake the special convex teeth72afail to pass, but allow other convex teeth to pass smoothly.

As shown inFIG. 34, when the positions of the special convex teeth72aand the special tooth grooves62ain the circumferential direction do not coincide, all the convex teeth can pass from the tooth grooves, so that the two handles can be changed from the open state to the closed state, and the multifunctional muscle exerciser can work properly. As shown inFIG. 35, as long as positions of one special convex tooth72aand one special tooth groove62aare overlapped in the circumferential direction, the connection ends of the two handles cannot get close since the depth of the special tooth groove62amakes the special convex tooth72afail to pass; and the spline shaft cannot be inserted into the spline sleeve so that the two handles cannot be changed to the closed state, and the multifunctional muscle exerciser cannot work properly. Therefore, as long as the positions of the special convex teeth72aand the special tooth grooves62aare appropriately set so that the angle between the two handles in the free state exceeds a preset value, and the positions of the special convex teeth72aand the special tooth grooves62aare overlapped in the circumferential direction, the purpose of limiting the angle between the handles can be achieved.

The relative positions of the outer gear ring6and the inner gear ring7in the axial direction can also be set in the manner described in Embodiment 4 (FIG. 19atoFIG. 19c) so as to realize the function of protecting the spline shaft and the spline sleeve.

In addition, as shown inFIG. 30, a baffle ring41can also be fixed at the left end of the sleeve4; and for the need of assembly, the baffle ring41is an independent member and is not integrally formed with the sleeve4. The right end of the baffle ring41is fixed at the left end of the sleeve4; the left end of the baffle ring41is sleeved outside the connection end1aof the left handle, but the inner diameter of the left end of the baffle ring41is smaller than the outer diameter of the outer gear ring6; when the connection ends of the two handles are separated by a certain distance, the spline shaft is completely separated from the spline sleeve; at this moment, the outer gear ring6is in contact with the baffle ring41so that the connection ends of the two handles cannot be separated continuously, i.e., the outer gear ring6constitutes a protrusion part, so that the outer gear ring6and the baffle ring41also constitute a limiting mechanism. The functions of the limiting mechanism are the same as those described in Embodiment 3.

The present embodiment can also comprise the insertion positioning mechanism as described in Embodiment 3. As shown inFIG. 30andFIG. 31; a section of annular groove33dis disposed in the cylindrical surface of the guide shaft33c; a guide hole matched with the guide shaft33cis disposed in the connection end of the right handle; a jacking bead34bis arranged on a hole wall of the guide hole in the radial direction; the jacking bead34bis in contact with the spring34a; and under the action of the spring34a, part of the spherical surface of the jacking bead34bmay be protruded from the inner wall of the guide hole. When the spline shaft33bis partially matched with the spline sleeve34, i.e., when the external spline tooth on the spline shaft33band the internal spline tooth of the spline sleeve34are meshed with each other in partial length, the jacking bead34bcan slide along the cylindrical surface of the guide shaft33c; when the spline shaft33bis completely matched with the spline sleeve34, i.e., when the external spline tooth on the spline shaft33band the internal spline tooth of the spline sleeve34are meshed with each other in full length, the jacking bead34bis just clamped into the annular groove33dto realize positioning, i.e., the annular groove33dand the jacking bead34bconstitute the insertion positioning mechanism.

Although the title of the present invention is a multifunctional muscle exerciser which can be used for exercising muscles of arms and shoulders, if the two handles are clamped by two legs, the multifunctional muscle exerciser can also be used for exercising the muscles of inner thighs and buttocks. Accordingly, the protection scope of the present invention should be defined by the structures recorded in claims and should not be limited by the use manner.

The above are merely preferred embodiments of the present invention. It should be noted that several improvements and replacements can also be made by those ordinary skilled in the art without departing from technical principles of the present invention, and these improvements and replacements should also be regarded as the protection scope of the present invention.