Patent Publication Number: US-10328299-B2

Title: Adjustable exercise device

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an adjustable exercise device or dumbbell or barbell or the like, and more particularly to an adjustable exercise device or dumbbell including an improved compact structure for allowing the weight members to be easily and quickly and readily and adjustably attached to or disengaged from the weight carrier or handle and for allowing the adjustable dumbbell to be easily operated by the user. 
     2. Description of the Prior Art 
     Typical exercise devices or barbells or dumbbells comprise a central handle member to be grasped or held by the user, and a number of weight plates to be attached onto the ends of the handle member for weight lifting or exercising purposes, or for exercising or training the upper muscle groups or the lower muscle groups of the user. 
     For example, U.S. Pat. No. 5,518,478 to Liang, U.S. Pat. No. 5,839,997 to Roth et al., U.S. Pat. No. 6,416,446 to Krull, U.S. Pat. No. 6,656,093 to Chen, U.S. Pat. No. 6,669,606 to Krull, U.S. Pat. No. 6,719,674 to Krull, U.S. Pat. No. 6,733,424 to Krull, U.S. Pat. No. 7,137,931 to Liu, U.S. Pat. No. 7,153,243 to Krull, U.S. Pat. No. 7,172,536 to Liu, U.S. Pat. No. 7,223,214 to Chen, U.S. Pat. No. 7,485,077 to Chen, U.S. Pat. No. 7,731,641 to Chen, and U.S. Pat. No. 8,025,613 to Wang disclose several typical adjustable dumbbells each comprising a number of weight plates or weight members selectively or adjustably attaching or mounting onto the handle shaft or handle bar that is provided for being held or grasped by the users to train the upper muscle groups or the lower muscle groups of the user, and a latch device attached onto the handle and/or the weighted plates for selectively or adjustably mounting or securing selected or different number of the weighted plates on the ends of the handle and for exercising or training the upper muscle groups or the lower muscle groups of the user. 
     A supporting base is further required to be provided for stably supporting the weight plates or weight members in place, and the latch device is required to be moved relative to the handle or the weight plates or weight members or actuated to engage with the required or selected number of the weighted plates or weight members when the weight plates or weight members are supported on or in the supporting base, and before the handle and the weight plates or weight members may be lifted or moved away from the supporting base, and the latch device is required to be moved relative to the handle or the weight plates or weight members or actuated to engage with and to couple the required or selected number of the weighted plates or weight members to the handle before the handle and the weight plates or weight members may be lifted or moved away from the supporting base. 
     However, the typical adjustable dumbbells include a complicated structure or configuration that may not be easily and quickly made or manufactured by the manufacturers and that may include a complicated making or manufacturing procedure and that may include a greatly increased manufacturing cost. In addition, the weight plates or weight members may have a good chance to be disengaged from the handle and/or the supporting base inadvertently. 
     The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional adjustable dumbbells. 
     SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide an adjustable exercise device or barbell or dumbbell including an improved compact structure for allowing the weight members to be easily and quickly and readily and adjustably attached to or disengaged from the weight carrier or handle and for allowing the adjustable dumbbell to be easily operated by the users. 
     The other objective of the present invention is to provide an adjustable exercise device or barbell or dumbbell including an improved compact structure for allowing the adjustable exercise device or dumbbell to be made or manufactured by the manufacturers and to give a security to the adjustable exercise device. 
     In accordance with one aspect of the invention, there is provided an adjustable exercise device comprising a number of weight members each including a groove formed in the weight member respectively, and the weight members each including two arms pivotally connected together with a pivot pin for allowing the arms to be pivoted and moved toward or away from each other, a link pivotally connected between the arms, a handle device including a handle bar having an end portion selectively engageable into the grooves of the weight members, and a hand grip rotatably disposed on the handle bar, and a number of plates rotatably disposed on the handle bar and rotated in concert with the hand grip relative to the handle bar, the plates are selectively engageable between the weight members, and the plates each include an engaging element for engaging with the link and for moving the arms toward each other to engage with the handle device when the plates and the hand grip are rotated relative to the handle bar, and for selectively anchoring a selected number of weight members to the handle bar of the handle device with the plates. The arms of each of the weight members each include a jaw extended from the arm for selectively engaging with the handle device. The weight members each include a spring biasing member engaged between the arms for biasing the arms away from each other and for opening the groove of the weight member. 
     The arms of the weight members each include an upper portion and a lower portion, the upper portions of the arms are pivotable and moveable toward and away from each other, and the lower portions of the arms are pivotable and moveable toward and away from each other, and the link is pivotally connected between the lower portions of the arms for moving the lower portions of the arms toward and away from each other selectively. 
     The link includes two levers each having a first end portion pivotally connected to the arm with a pivot pin, and a second end portion, and the second end portions of the levers are pivotally connected together with a pivot axle which is provided for selectively engaging with the engaging element. The link includes a gasket engaged onto the pivot axle for selectively engaging with the engaging element. 
     The plates each include a barrel provided on the plate and rotatably engaged on the handle bar for spacing the plates from each other. Two of the plates each include an engaging element for selectively engaging with the link, and another plate includes three engaging elements for selectively engaging with the link. The handle device includes a follower disposed between the plates and the hand grip and rotated in concert with the plates and the hand grip relative to the handle bar. 
     The follower includes a number of flaps extended from the follower and spaced from each other for forming a number of notches between the flaps. The handle device includes a housing rotatably engaged on the handle bar, and the housing includes a spring biased latch for selectively engaging with either of the notches of the follower and for anchoring the follower to the housing and for preventing the follower from being rotated relative to the housing. 
     The housing includes a casing having a compartment formed in the casing for slidably engaging with the spring biased latch, the casing includes an orifice formed in the casing, and a base support is provided for supporting the weight members, the base support includes a key extended from the base support for selectively engaging with the orifice of the casing. 
     The base support includes a number of socket openings formed in the base support, and a catch extended into each of the socket openings of the base support, and the arms of each of the weight members each include a tongue for engaging with the catch of the base support and for anchoring the weight members to the base support. 
     The housing includes a shank secured to the housing for engaging into the grooves of the weight members and for anchoring the housing to the weight members and for preventing the housing from rotating relative to the weight members. The shank includes a window formed in the shank, and the follower includes a number of ears for selectively aligning with the window of the shank, and the ears each include a digital or numeral for being shown and seen through the window of the shank. The arms of each of the weight members each include a recess formed in the arm, and the shank includes a number of projections for selectively engaging with the recesses of the arms and for anchoring the arms of the weight members to the shank. 
     The housing includes a spring biased projection engageable with the follower for anchoring and positioning the follower to the housing at selected angular positions, and the follower includes a number of depressions formed in the follower for selectively engaging with the spring biased projection and for positioning the spring biased projection to the follower. The follower includes a drum extended from the follower and secured to the hand grip, and the housing is rotatably engaged on the drum. 
     Further objectives and advantages of the present invention will become apparent from a careful reading of the detailed description provided hereinbelow, with appropriate reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a partial exploded view of an adjustable exercise device or barbell or dumbbell in accordance with the present invention; 
         FIG. 2  is a perspective view of the adjustable dumbbell; 
         FIG. 3  is a cross sectional view of the adjustable dumbbell, taken along lines  3 - 3  of  FIG. 2 ; 
         FIG. 4  is a partial exploded and cross sectional view of the adjustable dumbbell, illustrating the operation of the adjustable dumbbell; 
         FIG. 5  is another perspective view illustrating a handle device of the adjustable dumbbell; 
         FIG. 6  is a partial exploded view of the handle device of the adjustable dumbbell; 
         FIG. 7  is a further perspective view illustrating a weight member of the adjustable dumbbell; 
         FIG. 8  is another partial exploded view of the weight member of the adjustable dumbbell; 
         FIG. 9  is a partial exploded and cross sectional view similar to  FIG. 4 , illustrating the operation of the adjustable dumbbell; 
         FIGS. 10, 11, 12  are partial cross sectional views of the adjustable dumbbell, taken along lines  10 - 10 ,  11 - 11 ,  12 - 12  of  FIG. 9  respectively; 
         FIGS. 13, 14  are other partial cross sectional views similar to  FIGS. 10-12 , illustrating the operation of the adjustable dumbbell; 
         FIGS. 15, 16, 17  are further partial cross sectional views similar to  FIGS. 10-12 , illustrating the operation of the adjustable dumbbell; 
         FIG. 18  is another partial exploded and cross sectional view similar to  FIGS. 4 and 9 , illustrating the operation of the adjustable dumbbell as shown in  FIGS. 15-17 ; 
         FIG. 19  is a further partial exploded and cross sectional view similar to  FIGS. 4, 9 and 18 , illustrating the operation of the adjustable dumbbell; 
         FIGS. 20, 21, 22  are still further partial cross sectional views illustrating the operation of the adjustable dumbbell as shown in  FIG. 19 ; 
         FIG. 23  is a further partial exploded view illustrating the other arrangement of the adjustable dumbbell; and 
         FIGS. 24, 25  are still further cross sectional views of the adjustable dumbbell as shown in  FIG. 23 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to the drawings, and initially to  FIGS. 1-8 , an adjustable dumbbell or barbell or exercise device in accordance with the present invention comprises a receptacle or base support  10  including one or more (such as two) side or end portions  11 ,  12  each having one or more (such as three) recesses or socket openings  13  formed therein for receiving or accommodating or engaging with the weight plates or weight members  20  respectively, and each having a projection or key  14  extended upwardly therefrom, and each having one or more (such as three) locks or catches  15  extended into the socket openings  13  at each of the end portions  11 ,  12  of the base support  10 . The weight members  20  each include two weight bodies or arms  21 ,  22  pivotally or rotatably connected or coupled together with a pivot pin  23  at the middle or intermediate portion thereof and arranged for allowing the arms  21 ,  22 , such as the upper portions  24  and the lower portions  29  of the arms  21 ,  22  to be pivoted or moved toward or away from each other. 
     The weight members  20  each include a U-shaped opening or groove  25  formed therein, such as formed in the upper portion  24  thereof and located above the pivot pin  23 . The weight members  20  each further include a spring biasing member  26  contacted or engaged between the arms  21 ,  22 , particularly the upper portions  24  of the arms  21 ,  22  for biasing and forcing or moving the upper portions  24  of the arms  21 ,  22  away from each other and/or for opening the U-shaped groove  25  of the arms  21 ,  22  or of the weight members  20 . The arms  21 ,  22  of the weight members  20  each include a pawl or jaw  27  extended therefrom and extended into the groove  25  of the arms  21 ,  22 , and the jaws  27  of the arms  21 ,  22  of each of the weight members  20  are extended toward each other, and the arms  21 ,  22  of the weight members  20  each further include a depression or recess  28  formed therein, such as formed in the inner side at the upper portion  24  thereof, and a jaw or pawl or tongue  290  extended therefrom, and the recesses  28  and the tongues  290  of the arms  21 ,  22  of the respective weight member  20  are faced or directed toward each other respectively. 
     In operation, as shown in  FIGS. 1, 3 and 10-12 , when the arms  21 ,  22  of the weight members  20  are disposed or engaged into the socket openings  13  of the base support  10 , the upper portions  24  of the arms  21 ,  22  may be pivoted or biased and forced and moved away from each other with the spring biasing member  26 , and the U-shaped groove  25  of the arms  21 ,  22  or of the weight members  20  may be opened for receiving or engaging with a handle device  3 . For example, as shown in  FIGS. 1-8 , the handle device  3  includes a longitudinal spindle or handle bar  30  having a hand grip  31  rotatably disposed or provided on the middle or intermediate portion of the handle bar  30  for being grasped or held by the user and for carrying or lifting or moving the handle device  3  and for allowing the adjustable dumbbell to be easily operated by the user, and the hand grip  31  is rotatable relative to the handle bar  30 . One or more (such as two) end plates or end members  32  are attached or mounted or secured to the end portions of the handle bar  30  respectively for anchoring purposes. 
     One or more (such as two) followers  40  are rotatably disposed or provided on the end portions of the handle bar  30  and mounted or secured or coupled to the hand grip  31  and pivoted or rotated in concert with the hand grip  31  relative to the handle bar  30 , the followers  40  each include a cylindrical member or drum  41  formed or provided on the middle or center portion thereof ( FIG. 6 ) and rotatably engaged on the handle bar  30  and extended toward the hand grip  31  and engaged with or secured to the hand grip  31  with a toothed or serrated mechanism  42  for allowing the followers  40  to be pivoted or rotated in concert with the hand grip  31  relative to the handle bar  30 . The followers  40  each include one or more (such as six), or a number of flaps  43  laterally extended from the outer peripheral portion thereof and equally spaced from each other and extended toward the hand grip  31  for forming or defining one or more (such as six), or a number of equally spaced gaps or notches  44  between the flaps  43 . 
     As also shown in  FIG. 6 , the followers  40  each further include one or more (such as six), or a number of equally spaced ears  45  formed or provided or extended in the notches  44  of the followers  40  respectively, and the ears  45  each include a mark or digital or numeral  46  formed or provided thereon for weight indicating purposes. The followers  40  each further include one or more (such as six), or a number of equally spaced recesses or depressions  47  formed in one side portion thereof and faced or directed toward the hand grip  31 . One or more (such as three) spacing panels or plates  50 ,  51 ,  52  are also rotatably disposed or provided on each of the end portions of the handle bar  30  and disposed between the follower  40  and the end member  32  respectively, and the plates  50 ,  51 ,  52  each include a cylindrical member or barrel  53  formed or provided on the middle or center portion thereof and rotatably engaged on the handle bar  30  and extended toward the other plates  50 ,  51  or the followers  40  for separating or spacing the plates  50 ,  51 ,  52  and the followers  40  from each other. 
     For example, the first plate  50  is disposed located closer to the follower  40 , and the second plate  51  is disposed and arranged or located between the first and the third plates  50 ,  52 , and the third plate  52  is disposed and arranged or located closer to the end member  32  respectively, the barrels  53  of the second and the third plates  51 ,  52  are extended toward the first and the second plates  50 ,  51  respectively, and the barrels  53  of the first and the second plates  50 ,  51  are extended toward the follower  40  and the first plate  50  respectively, and the barrels  53  of the plates  50 - 52  are engaged with each other or secured together with a toothed or serrated mechanism  54  ( FIG. 6 ) for allowing the plates  50 - 52  and the followers  40  to be pivoted or rotated in concert with the hand grip  31  relative to the handle bar  30 . The plates  50 ,  51 ,  52  each include one or more engaging or anchoring members or elements  55 ,  56 ,  57  formed or provided on the inner peripheral portion of the plates  50 - 52  respectively, for selectively engaging with the weight members  20  ( FIGS. 15-17 ). 
     For example, as shown in  FIGS. 6 and 15-17 , the first plate  50  includes an engaging element  55  which extend or which include a curvature or length of about one fifth of the outer peripheral portion of the first plate  50 , and the second plate  51  includes an engaging element  56  which extend or which include a curvature or length of about one half of the outer peripheral portion of the second plate  51 , and the third plate  52  includes one or more (such as three) equally spaced engaging elements  57  each of which include a curvature or length of about one eighteenth of the outer peripheral portion of the third plate  52  for selectively engaging with the weight members  20  respectively when the followers  40  and the plates  50 ,  51 ,  52  are rotated relative to the handle bar  30  with the hand grip  31 , and for selectively forcing and moving the upper portions  24  and the jaws  27  of the arms  21 ,  22  toward each other, and for selectively anchoring or latching or retaining the selected numbers of the weight members  20  to the handle bar  30  of the handle device  3  with the plates  50 ,  51 ,  52  ( FIGS. 9-12, 15-22 ). 
     In operation, as shown in  FIGS. 3 and 10-12 , the end portions of the handle bar  30  and the barrels  53  of the plates  50 - 52  may be engaged into the grooves  25  of the weight members  20  for allowing the plates  50 - 52  to be engaged into the spaces between the weight members  20  and/or for allowing the weight members  20  to be engaged between the plates  50 - 52  and the followers  40 . As shown in  FIGS. 9-12, 15-22 , the followers  40  and the plates  50 - 52  may be rotated relative to the handle bar  30  with the hand grip  31  for selectively engaging the engaging elements  55 - 57  with the weight members  20  respectively, and for selectively forcing and moving the upper portions  24  and the jaws  27  of the arms  21 ,  22  toward each other, and for selectively anchoring or latching or retaining the selected numbers of the weight members  20  to the handle bar  30  of the handle device  3  with the plates  50 - 52  due to the arrangement or the engagement of the engaging elements  55 - 57  of the plates  50 - 52  with the weight members  20 , such as the pivot pin  23  of the weight members  20  respectively. 
     The adjustable exercise device or dumbbell further comprises one or more (such as two) control ferrules or housings  60  rotatably disposed or engaged on the handle bar  30  and/or the drums  41  of the followers  40  respectively, and an anchor lever or shank  61  mounted or secured to the respective housing  60  and to be engaged into the grooves  25  of the weight members  20  for anchoring or latching or retaining or positioning the housings  60  to the weight members  20  and for preventing the housings  60  from moving or pivoting or rotating relative to the weight members  30 , and the shank  61  includes an opening or window  62  formed and provided therein for selectively aligning with the ears  45  of the followers  40  and for allowing the numeral  46  of the ear  45  of the follower  40  to be seen through the window  62  of the shank  61  of the housing  60  selectively ( FIGS. 1-5 ). The housings  60  each include an orifice  69  formed therein ( FIG. 6 ) for slidably receiving or engaging with a spring biased projection  63  ( FIGS. 3-4, 6 ) which is engageable with either of the depressions  47  of the followers  40  and for anchoring or positioning the follower  40  to the housing  60  at the selected or predetermined angular position. 
     The housings  60  each further include a receptacle or casing  64  formed and provided therein ( FIG. 6 ), and a chamber or compartment  65  formed in the casing  64  ( FIGS. 3-4, 6 ) for slidably receiving or engaging with a spring biased lock or latch  70  therein, and an orifice  66  formed in a bottom wall  67  of the casing  64  and communicating with the compartment  65  of the casing  64  for selectively receiving or engaging with the key  14  of the base support  10  ( FIG. 3 ). The latch  70  may be biased to selectively engage with either of the notches  44  of the followers  40  that are formed or provided between the flaps  43  of the follower  40  ( FIG. 6 ) and to prevent the followers  40  and the plates  50 - 52  and the hand grip  31  from being pivoted or rotated relative to the handle bar  30  and the housings  60 , when the followers  40  and the handle device  3  are removed or disengaged or separated from the key  14  of the base support  10  ( FIG. 4 ). 
     In operation, as shown in  FIG. 3 , when the handle device  3  and the followers  40  and the plates  50 - 52  are engaged into the grooves  25  of the weight members  20  that are supported on the base support  10 , and when the keys  14  of the base support  10  are engaged into the orifices  66  of the bottom walls  67  of the casings  64  respectively, the keys  14  of the base support  10  may be contacted or engaged with the latch  70  for disengaging or separating the latch  70  from the notches  44  and the flaps  43  of the followers  40  and for allowing the followers  40  and the hand grip  31  of the handle device  3  and the plates  50 - 52  to be pivoted or rotated relative to the base support  10  and the handle bar  30 . At this moment, the keys  14  of the base support  10  are engaged with the orifices  66  of the bottom walls  67  of the casings  64  respectively such that the housings  60  are anchored or positioned or retained to the base support  10  and may not be pivoted or rotated or moved relative to the base support  10  and the handle bar  30 . 
     The followers  40  and the plates  50 - 52  may thus be rotated relative to the handle bar  30  with the hand grip  31  for selectively engaging with the weight members  20  and for selectively anchoring or latching or retaining the selected numbers of the weight members  20  to the handle bar  30  of the handle device  3  with the plates  50 - 52  ( FIGS. 12-22 ). As shown in  FIGS. 1 and 4 , when the handle device  3  and the followers  40  and the plates  50 - 52  are removed or disengaged or separated from the base support  10  and the weight members  20 , and when the keys  14  of the base support  10  are removed or disengaged or separated from the orifices  66  of the bottom walls  67  of the casings  64  of the housings  60 , the latch  70  may be biased and forced and moved to engage with either of the notches  44  of the followers  40  that are formed or provided between the flaps  43  of the follower  40  and to prevent the followers  40  and the plates  50 - 52  and the hand grip  31  from being pivoted or rotated or moved relative to the handle bar  30  and the housings  60  at this moment. 
     As shown in  FIGS. 9-12 , when none of the engaging elements  55 - 57  of the plates  50 - 52  are engaged with the pivot pins  23  of the weight members  20 , the upper portions  24  and the jaws  27  of the arms  21 ,  22  may not be moved and forced toward each other and none of the weight members  20  may be anchored or retained to the handle bar  30  of the handle device  3  with the plates  50 - 52 , such that none of the weight members  20  may be moved out of the base support  10  by or with the handle device  3  when the handle device  3  is moved away from the base support  10 . As shown in  FIGS. 7-8 and 10-14 , the weight members  20  each include a link  8  which include two levers  80 ,  81  each having first or outer end portions  82  pivotally or rotatably connected or coupled to the arms  21 ,  22  with a pivot pin  83  and second or inner end portions  84  pivotally or rotatably connected or coupled together with a pivot axle  85  and/or a washer or ring member or gasket  86  which is engaged onto the pivot axle  85 . 
     As shown in  FIGS. 15-18 , when all of the engaging elements  55 - 57  of the plates  50 - 52  are engaged with the pivot pins  23  of the weight members  20  and/or the pivot axle  85  and/or the gasket  86  of the link  8 , the lower portions  29  of the arms  21 ,  22  may be pivoted or moved away from each other with the levers  80 ,  81  of the link  8 , and the jaws  27  of the arms  21 ,  22  may be moved toward each other in order to engage with the handle bar  30  and/or the hand grip  31  of the handle device  3  and to selectively anchor or latch or retain all of the weight members  20  to the handle device  3  with the engaging elements  55 - 57  of the plates  50 ,  51 ,  52 . Similarly, as shown in FIGS.  19 - 22 , the selected numbers of the weight members  20  may be selectively anchored or retained to the handle bar  30  of the handle device  3  with either or some of all of the plates  50 - 52  when the hand grip  31  of the handle device  3  and the plates  50 - 52  and the followers  40  are pivoted or rotated relative to the base support  10  and the handle bar  30  and when the engaging elements  55 - 57  of the selected plates  50 - 52  are engaged with the pivot pins  23  of the selected weight members  20  and/or the pivot axle  85  and/or the gasket  86  of the link  8 . 
     The total weight of the selected numbers of the weight members  20  that are anchored or retained to the handle bar  30  of the handle device  3  may be reflected and indicated with the numeral  46  of the ear  45  of the follower  40  and may be seen through the window  62  of the shank  61  of the housing  60  selectively ( FIGS. 1-5 ). As shown in  FIGS. 1-2, 5-6, and 13-14 , the shanks  61  each may include one or more (such as three) pairs of projections  611  laterally extended therefrom for selectively engaging with the recesses  28  of the arms  21 ,  22  of the respective weight member  20  ( FIG. 14 ) and for solidly and stably anchoring or latching or retaining the weight member  20  to the shank  61  of the housing  60  and thus to the handle bar  30  of the handle device  3  and for preventing the weight member  20  from being disengaged or separated from the handle bar  30  of the handle device  3 . As shown in  FIG. 13 , the tongues  290  of the arms  21 ,  22  of the respective weight member  20  may be engaged with the catches  15  of the base support  10  for further solidly and stably anchoring or latching or retaining the weight member  20  to the base support  10  when the lower portions  29  of the arms  21 ,  22  are pivoted or moved toward each other. 
     As shown in  FIGS. 23-25 , the base support  10  may further include a number of latches or catches  101  extended into the socket openings  13  of the base support  10  respectively for selectively engaging with the corresponding depressions or recesses  201  that are formed in the arms  21 ,  22  of the weight members  20  for selectively anchoring or latching or retaining the weight member  20  to the base support  10  when the lower portions  29  of the arms  21 ,  22  are pivoted or moved toward each other and for preventing the weight member  20  from being disengaged or separated from the base support  10 . 
     Accordingly, the adjustable exercise device or dumbbell in accordance with the present invention includes an improved compact structure for allowing the weight members to be easily and quickly and readily and adjustably attached to or disengaged from the weight carrier or handle and for allowing the adjustable dumbbell to be easily operated by the users and to give a security to the adjustable exercise device. 
     Although this invention has been described with a certain degree of particularity, it is to be understood that the present disclosure has been made by way of example only and that numerous changes in the detailed construction and the combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as hereinafter claimed.