Patent Publication Number: US-9895280-B2

Title: Head massager and helmet size adjusting structure thereof

Description:
TECHNICAL FIELD 
     The present invention relates to the technical field of massagers, and more specifically, to a head massager and a helmet size adjusting structure thereof. 
     BACKGROUND 
     To apply to different people for use, a helmet for an existing head massager is generally adjustable in terms of a size. Head massager series produced by our company can be pulled by hand to move a first housing and a second housing relatively, thereby implementing spacing adjustment. A structure for this type of spacing adjustment is not easy to operate and has relatively poor reliability, and the structure is complex and high-cost, and therefore, improvement is urgently needed. 
     SUMMARY 
     An objective of the present invention is to provide a head massager and a helmet size adjusting structure thereof, so as to solve problems of difficult operation, poor reliability, and high cost that exist in the prior art. 
     To solve the foregoing technical problem, a technical solution of the present invention is: providing a helmet size adjusting structure, where the structure is disposed between a front housing and a rear housing of a helmet of a head massager and includes two racks that connect the front housing and the rear housing; rear ends of the two racks overlap each other, and an overlapping part is relatively contracted or expanded by using an adjusting apparatus; the adjusting apparatus includes a revolving shaft that extends from outside to inside and a gear disposed on an inner end of the revolving shaft, an upper part and a lower part of the gear are separately engaged with the racks, and a knob component and a locking component that locks the knob component are further disposed on an outer end of the revolving shaft; and the structure further includes two tension springs, where front ends of the tension springs are fastened on the rear housing and rear ends of the tension springs are separately fastened on the two racks; the knob component includes a knob outer ring, a knob shell that matches the knob outer ring, and a gear stand that is disposed inside the knob shell and can turn with the knob outer ring and the knob shell; the locking component includes a knob lock disposed inside the knob outer ring and the knob shell, an upper cover of the knob lock that is clamped with the knob lock, and an elastic element; the gear stand is located inside the knob lock, a unidirectional gear ring is disposed on the gear stand, a lock that can be clamped on the unidirectional gear ring is disposed on the knob lock, and the elastic element is disposed on the upper cover of the knob lock and configured to press against the upper cover of the knob lock so as to press on the knob lock, thereby matching the lock with the unidirectional gear ring for locking; teeth are further disposed on the gear stand, where the teeth pass through the knob lock and the knob shell in turn to engage with the gear. 
     Specifically, the gear stand includes a base body and a protrusion on the base body, the unidirectional gear ring is arranged by surrounding one surface of the base body, the teeth are disposed on the protrusion, and the teeth are in two groups and arranged in opposition to each other. 
     Specifically, two mounting studs are further disposed on the base body, the two mounting studs are arranged symmetrically to the protrusion, a mounting hole is disposed on each mounting stud, and connecting pins that can separately extend into the mounting holes are disposed correspondingly on the knob shell; two connecting holes are disposed on an inner side of the knob outer ring and connecting bumps that can be separately clamped into the two connecting holes are disposed on an inner side of the knob shell. 
     Specifically, a first card slot is further disposed on an inner side of the knob lock, a first card hook extending to an inner side is disposed on the upper cover of the knob lock, and the first card hook is disposed inside the first card slot, with the hook extending outwards. 
     Specifically, a boss extends from a center of the upper cover of the knob lock to the inner side, the elastic element is sleeved on the boss, the revolving shaft passes through a center of the boss, one step is disposed on the revolving shaft, and another end of the elastic element presses against the step. 
     Specifically, one anti-rotating spacer is further fastened on the upper cover of the knob lock. 
     Specifically, a central hole is disposed on the anti-rotating spacer, an end of the revolving shaft extends out of the central hole and is fastened by using a screw, and a connecting shaft that is correspondingly inserted into the upper cover of the knob lock is further disposed on the anti-rotating spacer. 
     Specifically, a knob button is further disposed on an outer side of the upper cover of the knob lock, the knob outer ring is hollow inside, and the knob button is exposed in a hollow hole of the knob outer ring. 
     Specifically, a second card slot is disposed on the upper cover of the knob lock and a second card hook that can be clamped into the second card slot is disposed on the knob button. 
     The present invention further provides a head massager that includes a helmet, where the foregoing size adjusting structure is disposed symmetrically on the helmet. 
     In this embodiment, when a helmet needs to be turned down, a knob outer ring is rotated and the knob outer ring drives a gear stand to turn. Because a gear ring matching the gear stand with a lock of a knob lock is unidirectional, the gear stand and the lock are unlocked by using a slope effect between the gear ring and the lock. The gear stand turns and drives a gear to turn and the gear drives two racks to become contracted relatively. Consequently, a front housing moves backwards and the helmet is turned down. In this process, rear ends of two tension springs separately move with the two racks, the two tension springs are elongated and when the racks are adjusted to a proper position, the knob outer ring is loosened, the knob lock again matches the unidirectional gear ring of the gear stand for locking under an elastic pressure effect of an elastic element, the gear stand and the gear cannot turn, and therefore, the front housing and a rear housing are relatively fixed; when a user is in a massaging process and feels that massaging strength is too intense to bear or does not want massaging, or want to turn up the helmet, the user presses an upper cover of the knob lock and uses the elastic element to move the knob lock in reverse to unlock the gear stand. In this way, the gear stand can be turned, the gear is no longer restricted, the tension springs are released, and the front housing immediately rebounds forwards, the racks are moved and reset under an effect of the tension springs, thereby enlarging spacing between the front housing and the rear housing, that is, the helmet is turned up. In the foregoing size adjusting structure, a knob and a button are designed as a whole, helmet adjustment is implemented by using two manners, and this operation structure is more convenient and an inner structure is more reliable. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic structural diagram of a helmet of a head massager when the helmet is turned up according to an embodiment of the present invention; 
         FIG. 2  is a schematic structural diagram of a helmet of a head massager when the helmet is turned down according to an embodiment of the present invention; 
         FIG. 3  is a side view of a helmet of a head massager when the helmet is turned up according to an embodiment of the present invention; 
         FIG. 4  is a schematic structural diagram of a helmet of a head massager when the helmet is turned up and a rear housing panel is removed according to an embodiment of the present invention; 
         FIG. 5  is an exploded view of a helmet of a head massager according to an embodiment of the present invention; 
         FIG. 6  is an enlarged view of a position A of  FIG. 5 ; 
         FIG. 7  is an exploded view of a knob component and a locking component of a head massager according to an embodiment of the present invention; 
         FIG. 8  is an exploded view of a knob component and a locking component of a head massager that are observed from another perspective according to an embodiment of the present invention; 
         FIG. 9  is a sectional view  1  of a helmet of a head massager according to an embodiment of the present invention; 
         FIG. 10  is an enlarged view of a position B of  FIG. 9 ; 
         FIG. 11  is a sectional view  2  of a helmet of a head massager according to an embodiment of the present invention; 
         FIG. 12  is an enlarged view of a position C of  FIG. 11 ;
           100 —Front housing;  200 —Rear housing;  300 —Rack;  310 —Tooth space;     311 —Upper teeth;  312 —Lower teeth;  400 —Adjusting apparatus;  410 —Revolving shaft;     411 —Step;  420 —Gear;  430 —Gear cover;  500 —Knob component;     510 —Knob outer ring;  511 —Connecting hole;  520 —Knob shell;  521 —Base plate;     522 —Connecting pin;  523 —Connecting bump;  530 —Gear base;  531 —Unidirectional gear ring;     532 —Teeth;  533 —Base;  534 —Protrusion;  535 —Mounting stud;     5351 —Mounting hole;  600 —Locking component;  610 —Knob lock;  611 —Lock;     612 —First card slot;  613 —Opening;  620 —Upper cover of the knob lock;  621 —First card hook;     622 —Card block;  623 —Boss;  624 —Second card slot;  630 —Elastic element;     640 —Knob button;  641 —Second card hook;  700 —Tension spring;  800 —Anti-rotating spacer;     810 —Central hole; and  820 —Connecting shaft.       

     
    
    
     DESCRIPTION OF EMBODIMENTS 
     To make the objectives, technical solutions, and advantages of the present invention clearer and more comprehensible, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely used to explain the present invention but are not intended to limit the present invention. 
     Referring to  FIG. 1  to  FIG. 4 , the present invention provides a head massager. The head massager is in a shape of a helmet, the helmet is formed by combining a front housing  100  and a rear housing  200 , and a size of the helmet is implemented by using a size adjusting structure disposed between the front housing  100  and the rear housing  200 , thereby adapting to head shapes of different users. 
     Referring to  FIG. 5  to  FIG. 8 , the helmet size adjusting structure includes two racks  300  that connect the front housing  100  and the rear housing  200 . Front ends of the two racks  300  are separately connected to the front housing  100 , rear ends of the two racks  300  overlap each other on the rear housing  200 , and an overlapping part is relatively contracted or expanded by using an adjusting apparatus  400 , thereby driving the front housing  100  to move relatively to the rear housing  200 . Specifically, the adjusting apparatus  400  includes a revolving shaft  410  that extends from outside to inside of the rear housing  200  and a gear  420  disposed on an inner end of the revolving shaft  410 . Tooth space  310  is provided on both overlapping parts of the two racks  300 , where upper teeth  311  are disposed on tooth space  310  of one rack  300 , lower teeth  312  are disposed on tooth space  310  of another rack  300 , and an upper part and a lower part of the gear  420  are engaged with the upper teeth  311  and the lower teeth  312  respectively. In this way, when being turned, the gear  420  is engaged with the upper teeth  311  and the lower teeth  312  to drive the two racks  300  to become relatively contracted or expanded, so that the helmet can be turned down or turned up. A gear cover  430  is further fastened on an outer side of the gear  420 . A knob component  500  and a locking component  600  that locks the knob component  500  are further disposed on an outer end of the revolving shaft  410 . The knob component  500  includes a knob outer ring  510 , a knob shell  520  that matches the knob outer ring  510 , and a gear stand  530  that is disposed inside the knob shell  520  and can turn with the knob outer ring  510  and the knob shell  520 . The locking component  600  includes a knob lock  610  disposed inside the knob outer ring  510  and the knob shell  520 , an upper cover  620  of the knob lock that is clamped with the knob lock  610 , and an elastic element  630 . The gear stand  530  is located inside the knob lock  610 , a unidirectional gear ring  531  is disposed on the gear stand  530 , and a lock  611  that can be clamped on the unidirectional gear ring  531  is disposed on the knob lock  610 . In this way, by matching the lock  611  with the unidirectional gear ring  531 , the gear stand  530  is locked and prevented from turning. In addition, the elastic element  630  is disposed on the upper cover  620  of the knob lock and configured to press against the upper cover  620  of the knob lock so as to press on the knob lock  610 , thereby matching the lock  611  with the unidirectional gear ring  531  for locking. Teeth  532  are further disposed on the gear stand  530 , where the teeth  532  pass through the knob lock  610  and the knob shell  520  in turn to engage with the gear  420 . In this embodiment, the size adjusting structure further includes two tension springs  700 , where front ends of the tension springs  700  are fastened on the rear housing  200  and rear ends of the tension springs  700  are separately fastened on the two racks  300 . In this embodiment, when the helmet needs to be turned down, the knob outer ring  510  is rotated and the knob outer ring  510  drives the gear stand  530  to turn. Because the gear ring matching the gear stand  530  with the lock  611  of the knob lock  610  is unidirectional, the gear stand  530  and the lock  611  are unlocked by using a slope effect between the unidirectional gear ring  531  and the lock  611 . The gear stand  530  turns and drives the gear  420  to turn and the gear  420  drives the two racks  300  to become contracted relatively. Consequently, the front housing  100  moves backwards and the helmet is turned down. In this process, the rear ends of the two tension springs  700  separately move with the two racks  300 , the two tension springs  700  are elongated and when the helmet is adjusted to a proper position, the knob outer ring  510  is loosened, the knob lock  610  again matches the unidirectional gear ring  531  of the gear stand  530  for locking under an elastic pressure effect of the elastic element  630 , the gear stand  530  and the gear  420  cannot turn, and therefore, the front housing  100  and the rear housing  200  are relatively fixed; when a user is in a massaging process and feels that massaging strength is too intense to bear or does not want massaging, or want to turn up the helmet, the user presses the upper cover  620  of the knob lock and uses the elastic element  630  to move the knob lock  610  in reverse to unlock the gear stand  530 . In this way, the gear stand  530  can be turned, the gear  420  is no longer restricted, the tension springs  700  are released, and the front housing  100  immediately rebounds forwards, thereby enlarging spacing between the front housing  100  and the rear housing  200 , that is, the helmet is turned up. In the size adjusting structure provided in this embodiment, a knob and a button are designed as a whole, helmet adjustment is implemented by using two manners, this operation structure is more convenient, and an inner structure is more reliable. 
     Specifically, referring to  FIG. 7  and  FIG. 8 , the gear stand  530  includes a disk-shaped base body  533  and a cylindrical protrusion  534  that is disposed on a center of the base body  533 , the unidirectional gear ring  531  is arranged by surrounding one surface of the base body  533 , and the protrusion  534  is disposed on a same surface with the unidirectional gear ring  531 . Teeth  532  are disposed on the protrusion  534 , and the teeth  532  are in two groups and arranged in opposition to each other. The two groups of teeth  532  are located on a circumference of the protrusion  534 . In this way, both the two groups of teeth  532  can be engaged with the gear  420 . 
     In this embodiment, the knob outer ring  510 , the knob shell  520 , and the gear stand  530  are fastened as a whole to form the foregoing knob component  500  and the knob outer ring  510 , the knob shell  520 , and the gear stand  530  can rotate together. Specifically, a connection relationship among the knob outer ring  510 , the knob shell  520 , and the gear stand  530  is as follows: two mounting studs  535  are further disposed on the base body  533  of the gear stand  530 , the two mounting studs  535  are arranged symmetrically to the protrusion  534 , and a mounting hole  5351  is disposed on each mounting stud  535 ; the knob shell  520  is of a tubular structure, with a base plate  521  on one end and no base plate on the other end that is in a shape of a full opening; a central hole is disposed on the base plate  521 , and connecting pins  522  that can separately extend into the mounting holes  5351  are disposed correspondingly on an inner side of the base plate  521 , and in this way, the gear stand  530  and the knob shell  520  are fastened by matching the connecting pins  522  with the mounting holes  5351 ; in addition, the knob outer ring  510  is of a loop structure and two connecting holes  511  are disposed on an inner side of the knob outer ring  510  and connecting bumps  523  that can be separately clamped into the two connecting holes  511  are disposed on an inner side of the knob shell  520 ; in this way, the knob shell  520  and the knob outer ring  510  are fastened by matching the connecting bumps  523  with the connecting holes  511 , and therefore, with the foregoing structure, the knob outer ring  510 , the knob shell  520 , and the gear stand  530  are connected as a whole. 
     Referring to  FIG. 7  and  FIG. 8  again, a knob lock  610  is of a hollow tubular structure, and a first card slot  612  is disposed on an inner wall of the knob lock  610 ; an upper cover  620  of the knob lock is of a circular cover structure and a first card hook  621  extending to an inner side is disposed on the upper cover  620  of the knob lock, and the first card hook  621  is disposed inside the first card slot  612 , with the hook extending outwards. Further, two openings  613  are further disposed on the tubular wall of the knob lock  610  and card blocks  622  that can be separately clamped into the two openings  613  are disposed on the upper cover  620  of the knob lock. In this way, the matching between the openings  613  and the card blocks  622  not only facilitates positioning when the knob lock  610  and the upper cover  620  of the knob lock are installed, but also more tightly connects the knob lock  610  and the upper cover  620  of the knob lock. 
     Referring to  FIG. 9  to  FIG. 12 , in this embodiment, a boss  623  extends from a center of an upper cover  620  of a knob lock to an inner side, an elastic element  630  is sleeved on the boss  623 , a revolving shaft  410  passes through a center of the boss  623 , one step  411  is disposed on the revolving shaft  410 , and another end of the elastic element  630  presses against the step  411 . Specifically, the elastic element  630  is a spring. Because the first card hook  621  on the upper cover  620  of the knob lock is disposed inside the first card slot  612  of a knob lock  610 , with the hook extending outwards, the elastic element  630  is in contracted state during pre-assembly and imposes outward force to the upper cover  620  of the knob lock, the force also indirectly enables the first card hook  621  to impose outward force on the first card slot  612 . At this time, the knob lock  610  also receives outward force, and therefore, the knob lock  610  is more tightly matched with the gear stand  530 . 
     Further, to prevent the upper cover  620  of the knob lock from turning, an anti-rotating spacer  800  is further fastened on the upper cover  620  of the knob lock. Specifically, the anti-rotating spacer  800  is of a rectangular block structure, a central hole  810  is disposed on the anti-rotating spacer  800 , and an end of the revolving shaft  410  extends out of the central hole  810  and is fastened by using a screw. Because the revolving shaft  410  is fastened with a rear housing  200  and cannot be turned, the anti-rotating spacer  800  is also fixed and cannot be turned. In addition, the anti-rotating spacer  800  is also fastened on the upper cover  620  of the knob lock, and therefore, the upper cover  620  of the knob lock also cannot be turned. Specifically, a connecting shaft  820  that is correspondingly inserted into the upper cover  620  of the knob lock is disposed on the anti-rotating spacer  800 , and the anti-rotating spacer  800  is fastened on the upper cover  620  of the knob lock by using the connecting shaft  820 . 
     In this embodiment, to better press the upper cover  620  of the knob lock, a knob button  640  is further disposed on an outer side of the upper cover  620  of the knob lock, the knob outer ring  510  is hollow inside, and the knob button  640  is exposed in a hollow hole of the knob outer ring  510 , thereby facilitating pressing of the knob button  640 . Specifically, a second card slot  624  is disposed on the upper cover  620  of the knob lock and a second card hook  641  that can be clamped into the second card slot  624  is disposed on the knob button  640 . In this way, the knob button  640  is fastened on the upper cover  620  of the knob lock by matching the second card slot  624  with the second card hook  641 . 
     Referring to  FIG. 10  again, when a helmet needs to be turned down, a knob outer ring  510  is rotated and the knob outer ring  510  drives a gear stand  530  to turn. Because the gear ring matching the gear stand  530  with a lock of a knob lock  610  is unidirectional, the gear stand  530  and the lock  611  are unlocked by using a slope effect between the unidirectional gear ring  531  and the lock  611 . The gear stand  530  turns and drives the gear  420  to turn and the gear  420  drives two racks  300  to become contracted relatively. Consequently, a front housing  100  moves backwards and the helmet is turned down. In this process, rear ends of two tension springs  700  separately move with the two racks  300 , the two tension springs  700  are elongated and when the helmet is adjusted to a proper position, the knob outer ring  510  is loosened, the knob lock  610  moves outwards under the pressure effect of the elastic element  630 , so that the lock  611  on the knob lock  610  again matches the unidirectional gear ring  531  of the gear stand  530  for locking, the gear stand  530  and the gear  420  cannot turn, and therefore, the front housing  100  and a rear housing  200  are relatively fixed. 
     Referring to  FIG. 12  again, when a user is in a massaging process and feels that massaging strength is too intense to bear or does not want massaging, or want to turn up a helmet, the user presses a knob button  640 , rotates an upper cover  620  of a knob lock to move inwards, and pushes a knob lock  610  to move inwards and in this way, a lock  611  on the knob lock  610  and a gear stand  530  are unlocked, the gear stand  530  can be turned, a gear  420  is no longer restricted, tension springs  700  are released, a front housing  100  immediately rebounds forwards, a rack  300  is moved and reset under an effect of the tension springs  700 , thereby enlarging spacing between the front housing  100  and a rear housing  200 , that is, the helmet is turned up. 
     In conclusion, in this embodiment, size adjustment is implemented by using two operation manners, rotating and pressing, thereby making the operation easier. In addition, adjusting structures are combined as a whole, and therefore, the structures are more simplified, the cost is lower, and product reliability and market competitiveness are improved. 
     The foregoing descriptions are merely exemplary embodiments of the present invention, but are not intended to limit the present invention. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.