Abstract:
Swimming goggles have a frame unit, lenses and buckles assembled on the frame unit, and at least a head strap with a plurality of stop grooves. Each buckle comprises an abutting arm having a stop end, an operating lever being movable transversely and bringing the abutting arm to move, and an offset portion between the abutting arm and the operating lever. When the operating lever moves transversely, the offset portion makes the stop end of the abutting arm move upward or downward to abut or release the stop grooves of the head strap. The swimming goggles adjust length of the head strap easily.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to swimming goggles, and particularly to swimming goggles with an adjustable head strap. 
         [0003]    2. Related Art 
         [0004]    Swimming goggles typically adjust length of a head strap thereof with buckles. Such a buckle generally has a profile of two neighboring square rings, and defines two slots. Two free ends of the head strap respectively extend through the slots and overlap with each other. During adjustment of the head strap, friction between the overlapped portion of the head strap will block movement of head strap. 
         [0005]    Furthermore, swimming goggles with a left frame, a right frame and a connecting portion integrated together, demand material which enables lenses retained in the left frame and the right frame. The material should not be so soft that can not fix the lenses and resist water pressure. The material is therefore limited to given rigidness, and a pad formed on the left frame and the right frame can not be soft sufficient to touch a user&#39;s face comfortably when wearing. Additionally, because the integrated swimming goggles opt for material with given rigidness, the connecting portion between the left frame and the right frame is too stiffened to suit for users with different face profiles, and the left frame and the right frame can not fit close to the user&#39;s face, thus taking risk of water leakage. 
       SUMMARY OF THE INVENTION 
       [0006]    In view of the foregoing, an object of the present invention is direct to provide swimming goggles which transversely adjust a head strap easily and which are worn comfortably. 
         [0007]    The swimming goggles comprise a frame unit, lenses and buckles assembled on the frame unit, and a strap element with at least a head strap. The head strap defines a plurality of stop grooves. The buckles are capable of abutting against or releasing the stop grooves of the head strap. Each buckle comprises an abutting arm having a stop end, an operating lever being movable transversely and driving the abutting arm to move, and an offset portion between the abutting arm and the operating lever. When the operating lever moves transversely, the offset portion makes the stop end of the abutting arm move upward or downward to abut or release the stop grooves of the head strap. 
         [0008]    The offset portion comprises a recessed portion defined about a center of the operating lever. The recessed portion forms a first inclined surface. The stop end forms a stop block thereon, the stop block forming a second inclined surface for corresponding to the first inclined surface. When the operating lever moves transversely, the second inclined surface of the abutting arm moves along the first inclined surface to bring the stop end to move upwardly, releasing the stop grooves of the head strap. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is an exploded view of swimming goggles of the present invention. 
           [0010]      FIG. 2  is an assembled view of the swimming goggles of  FIG. 1 . 
           [0011]      FIG. 3  is an elevation view of a frame unit of the swimming goggles of  FIG. 1 . 
           [0012]      FIG. 4  is a sectional view taken along the line  4 - 4  in  FIG. 3 . 
           [0013]      FIG. 5  is a perspective view of the swimming goggles, where a cover is removed. 
           [0014]      FIG. 6  is a partially enlarged view of the swimming goggles with a head strap assembled thereto. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0015]    With reference to  FIG. 2 , swimming goggles  1  of the present invention comprise a frame unit  2 , lenses  3  mounted on the frame unit  2 , buckles  4  assembled on the frame unit  2 , and a strap element  5 . See  FIG. 6 , the strap element  5  has a head strap  50  defining stop grooves  51  therein. The buckles  4  are made of hard material, for example PP material, and are able to be assembled with the lenses  3  and the strap element  5 . The frame unit  2  is unitarily made of soft material, for example thermal plastic rubber (TPR), Silica gel or the like, and includes a left frame  20 , a right frame  21 , a connecting portion  22  connecting the left frame  20  and the right frame  21 , and a pad  23 . The frame unit  2  shrouds edges of the lenses  3  and parts of the buckles  4 . 
         [0016]    Further referring to  FIG. 1 , each buckle  4  includes a base  40 , a cover  41 , an abutting arm  42 , an operating lever  43  and an offset portion between the abutting arm  42  and the operating lever  43 . The base  40  forms a link portion. In one embodiment, the link portion comprises a branch  401  extending from an end of the base  40 . A plurality of protuberances  402  is formed on a front end of the branch  401 . A positioning portion is formed in the vicinity of the branch  401  of the base  40 . In one embodiment, the positioning portion comprises an engraving portion  403  on the base  40 . An axis support  404  is formed lengthwise along the engraving portion  403 . Three rails  405  are transversely disposed neighboring the engraving portion  403 . A guiding portion is formed on an end of the base  40  and corresponds to the link portion for guiding and positioning the head strap  50 . In one embodiment, the guiding portion includes a guiding bore  406  next to the rails  405  for guiding and positioning the head strap  50 . Assembling portions are respectively formed on both sides of the base  40  and adjacent the axis support  404  and the guiding bore  406 . In one embodiment, the assembling portions include embedding grooves  407  respectively in both sides of the base  40  for assembling with the cover  41 . 
         [0017]    The cover  41  comprises latch portions and locking portions. In one embodiment, the latch portions comprise latch posts  411  depending from the cover  41  and corresponding to the embedding grooves  407 . The locking portions comprise engaging posts  412  on the cover  41  for assembling to the left frame  20  and the right frame  21 . 
         [0018]    The abutting arm  42  is pivoted to the axis support  404 , and includes a stop end  421 , an abutting end  422 , and a pivot shaft  423  between the stop end  421  and the abutting end  422 . The pivot shaft  423  is assembled onto the axis support  404  when assembled. As a result, the abutting arm  42  is pivoted to the axis support  404  complying with leverage principle. That is, the pivot shaft  423  acting as a fulcrum, the stop end  421  and the abutting end  422  move in reverse directions, respectively. The stop end  421  forms a stop block  424  thereon. A second inclined surface  425  is formed with an angle of 45 degree on the stop block  424 . 
         [0019]    The operating lever  43  is disposed below the abutting arm  42 , and includes guiding bars  431  respectively corresponding to the rails  405 . The guiding bars  431  fit to the rails  405  in width. Consequently, the guiding bars  431  are limited onto and transversely slide along the rails  405  reliably. The offset portion comprises a recessed portion  432  defined about a center of the operating lever  43 . The recessed portion  432  forms a first inclined surface  433  with an angle of 45 degree for corresponding to the second inclined surface  425 . The first inclined surface  433  and the second inclined surface  425  cooperate to each other with the angles of 45 degree, increasing sensitivity of movement of the stop end  421 . Transverse movement of the operating lever  43  (referring to  FIG. 4 ) brings the second inclined surface  425  of the abutting arm  42  to slide along the first inclined surface  433 . Correspondingly, the stop end  421  moves upwardly, releasing the stop grooves  51  of the head strap  50 . The operating lever  43  gradually increases in width toward both ends thereof for facilitating manual operation. 
         [0020]    It is notable that resilient members are provided on outward sides of the left frame  20  and the right frame  21 . In one embodiment, the resilient members include platforms  60  integrally formed on the left frame  20  and the right frame  21 . Due to flexibility thereof, the platforms  60  are capable of preserving energy when being pressed to deform. When the stop ends  421  move upwardly, the abutting ends  422  move downwardly and press against the platforms  60  to make the platforms  60  deform. When the operating levers  43  return to the original positions, preserved energy of the platforms  60  drive the stop ends  421  to move to a state of stopping the head strap  50 . Furthermore, locking grooves  61  are defined at outward sides of the left frame  20  and the right frame  21  for locking with the engaging posts  412  of the covers  41 , whereby the buckles  4  are secured to the outward sides of the left frame  20  and the right frame  21 . 
         [0021]    A plurality of injecting holes  30  and assembling holes  31  are defined in peripherals of the lenses  3 . Plastic is shaped to clamp and envelope peripherals of the lenses  3  through the injecting holes  30 . In assembly, the protuberances  402  of the branches  401  are assembled onto the assembling holes  31  for preliminarily positioning. Therefore, the branches  401 , the assembling holes  31  and the protuberances  402  are shrouded together during integrally shaping. 
         [0022]    Referring to  FIG. 1  and  FIGS. 3-6 , during assembly, the protuberances  402  of the branches  401  are preliminarily assembled to the assembling holes  31  of the lenses  3 . The left frame  20 , the right frame  21 , the connecting portion  22  and the pad  23  are integrally shaped. At the same time, peripherals of the lenses  3  and the injecting holes  30 , the branches  401 , the assembling holes  31  and the protuberances  402  are enveloped. Thus the bases  40  of the buckles  4  are connected with the left frame  20 , the right frame  21 , the connecting portion  22  and the lenses  3 . The guiding bars  431  of the operating levers  43  are assembled onto the rails  405 . The pivot shafts  423  of the abutting arms  42  are mounted to the axis supports  404 . The latch posts  411  of the covers  41  latch with the embedding grooves  407  of the bases  40 . The engaging posts  412  of the covers  41  lock with the locking grooves  61 . The operating levers  43  and the abutting arms  42  are assembled to the bases  40 . 
         [0023]    When assembled, as shown in  FIGS. 4 and 6 , the stop ends  421  of the abutting arms  42  abut against the stop grooves  51  of the head strap  50 . Meanwhile the head strap  50  is allowed to move only in a single direction as the arrow in  FIG. 4 . The head strap  50  is only permitted to be tightened and is prohibited to be loosened. When the operating levers  43  move transversely, as the dashed lines in  FIGS. 4 and 6 , the stop ends  421  move upwardly, and disengage from the stop grooves  51 . The head strap  50  is allowed to move in the direction toward loosening. As the stop ends  421  move upward, the abutting ends  422  move downward and press the platforms  60 . The platforms  60  are urged to deform to preserve energy. When the operating levers  43  move transversely to original positions, due to the preserved energy of platforms  60 , the stop ends  421  return to abut the stop grooves  51 . In this way, the head strap  50  is adjusted conveniently. 
         [0024]    It is understood that the invention may be embodied in other forms without departing from the spirit thereof. Thus, the present examples and embodiments are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein.