Patent Publication Number: US-9883750-B2

Title: Frame height adjusting mechanism and frame therewith

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an infant carrier, and more particularly, to a frame height adjusting mechanism and a frame therewith. 
     2. Description of the Prior Art 
     A conventional baby bed usually includes a frame and a cradle fixed above the frame. However, it has the disadvantages that the conventional body bed has only one mode of use when it is in use, and a height of the cradle cannot be adjusted after a baby lies on the cradle. Therefore, it is not convenient for parents to look after their baby. There is another conventional baby bed having a detachable structure which includes a frame and a cradle detachably installed on the frame, i.e., the cradle can be installed on the frame or detached from the frame, such that the cradle can be placed on the ground or other locations. Since such conventional baby bed has two modes of use, it is more flexible than the conventional one with only one using mode. However, a height of the cradle of such conventional baby cot still cannot be adjusted according to heights of parents or actual requirement. 
     Therefore, there is a need to design a frame height adjusting mechanism capable of adjusting a height of a frame, so as to adjust a height of a cradle easily. 
     SUMMARY OF THE INVENTION 
     The present invention aims at providing a frame height adjusting mechanism and a frame therewith to solve the above-mentioned drawbacks. 
     According to the claimed invention, a frame height adjusting mechanism is adapted for a frame including an inner pipe and an outer pipe sheathing on the inner pipe. A fixing hole is formed on one of the inner pipe and the outer pipe. A plurality of positioning holes is formed on the other one of the inner pipe and the outer pipe along a vertical direction, and the frame height adjusting mechanism includes a driving member and at least one engaging member. The driving member is slidably disposed on the inner pipe or the outer pipe where the fixing hole is formed. The driving member includes at least one first inclined surface. The at least one engaging member is slidably disposed on the driving member and passing through the fixing hole to insert into one of the plurality of positioning holes. The at least one first inclined surface pushes the at least one engaging member to disengage from the corresponded positioning hole when the driving member slides upwardly. 
     Preferably, the frame further includes a horizontal pipe. The outer pipe is fixed on a lower end of the horizontal pipe. The fixing hole is formed on a front side of a lower end of the outer pipe. The plurality of positioning holes is formed on a side of the inner pipe adjacent to the fixing hole. The at least one engaging member and the at least one first inclined surface are disposed on a lower end of the driving member. An upper end of the driving member passes through the horizontal pipe upwardly and is movable relative to the horizontal pipe along the vertical direction. The frame height adjusting mechanism further includes a linking member slidably disposed on the horizontal pipe along a longitudinal direction of the horizontal pipe. The linking member includes at least one second inclined surface driven to push the driving member by the linking member. 
     Specifically, an extending direction of the at least one second inclined surface and a sliding direction of the linking member are located in a same plane, and the frame height adjusting mechanism further includes at least one first contacting portion disposed on the upper end of the driving member and abutting against an lower end of the at least one second inclined surface. 
     More specifically, the driving member further includes a rectangular portion, and the at least one first contacting portion is a column protruding from a side of the rectangular portion. 
     Furthermore, an avoiding slot is formed on the linking member and extends along the sliding direction of the linking member. The driving member passes through the linking member. The rectangular portion is slidably received in the avoiding slot. The linking member includes two second inclined surfaces disposed on two sides of the avoiding slot, and the frame height adjusting mechanism includes two first contacting portions respectively protruding from two sides of the rectangular portion. 
     Furthermore, a guiding slot is formed on the outer pipe along the vertical direction, and the rectangular portion is slidably received in the guiding slot. 
     Specifically, a sliding slot is sunk from a top surface of the horizontal pipe, and the linking member is slidably received in the sliding slot. 
     More specifically, the frame further includes a cover installed on the horizontal pipe and covering the linking member. 
     Furthermore, the frame height adjusting mechanism further includes a first resilient member disposed between the cover and the linking member, and the first resilient member provides a first resilient force for pushing the driving member downwardly. 
     Furthermore, the frame height adjusting mechanism further includes a stopping portion and an abutting portion. The stopping portion upwardly protrudes from an end of the linking member near a lower end of the at least one second inclined surface. The abutting portion downwardly protrudes from the cover and abuts against a side of the stopping portion toward the at least one second inclined surface. 
     Furthermore, a circular hole is formed on the cover for allowing the driving member to pass through upwardly, and the circular hole penetrates the abutting portion. 
     Specifically, the at least one first inclined surface obliquely extends away from a rear side of the outer pipe from top to bottom, the at least one engaging member includes a second contacting portion, the second contacting portion abuts against an upper end of the at least one first inclined surface when the at least one engaging member is inserted into one of the plurality of positioning holes. 
     More specifically, a recess area is formed on a front side of the outer pipe. The fixing hole is formed on a bottom wall of the recess area. The driving member is located in the recess area. A long hole is formed on the lower end of the driving member and corresponded to the fixing hole. The long hole extends along the vertical direction. The at least one first inclined surface located at an outer periphery of the long hole protrudes from a side of the driving member away from the rear side of the outer pipe. The at least one engaging member is a pin of a rotating structure, and the second contacting portion protrudes from an outer periphery of the at least one engaging member. 
     Furthermore, a U-shaped portion protrudes from the side of the driving member away from the rear side of the outer pipe and encloses a lower portion of the long hole, and the at least one first inclined surface is formed on an upper end of each of two side walls of the U-shaped portion. 
     Furthermore, the frame further includes a lower plug detachably inserted into the lower end of the outer pipe. The lower plug includes a sliding portion slidably received in the recess area, and a through hole is formed on the sliding portion and corresponded to the fixing hole. 
     Furthermore, the frame height adjusting mechanism further includes a second resilient member disposed between the lower plug and the at least one engaging member. The second resilient member provides a second resilient force for inserting the at least one engaging member into one of the plurality of positioning holes. 
     Specifically, the frame height adjusting mechanism further includes an operating member and a connecting wire. The operating member is slidably disposed on the frame. An end of the connecting wire is fixed on the operating member, and the other end of the connecting wire extends along the horizontal pipe and is fixed on the linking member. 
     Preferably, the fixing hole is formed on the inner pipe. The plurality of positioning holes is formed on the outer pipe. The at least one engaging member includes a locking member and a sliding pin protruding from a side of the locking member. A sliding slot is formed on the driving member obliquely. The sliding pin is slidably received in the sliding slot. The sliding slot is gradually away from the fixing hole corresponded to the at least one engaging member from top to bottom. The at least one first inclined surface is formed on a side of the sliding slot near the fixing hole corresponded to the at least one engaging member, and the sliding pin is located at an upper end of the sliding slot when the locking member is inserted into the fixing hole. 
     Specifically, the sliding slot penetrates the driving member. The hollow chamber is formed in the driving member and communicates with the sliding slot. The locking member is slidably received in the hollow chamber, and the sliding pin protrudes from two sides of the locking member. 
     Specifically, the fixing hole is formed on each of a left side and a right side of the inner pipe. The plurality of positioning holes is formed on each of a left side and a right side of the outer pipe. Two sliding slots are formed on the driving member symmetrically, and the frame height adjusting mechanism includes two engaging members disposed in the two sliding slots respectively. 
     Specifically, the frame further includes a lower plug detachably installed on a lower end of the inner pipe. The lower plug is inserted into the inner pipe upwardly. The driving member is slidably received in the lower plug, and an inner bottom surface of the lower plug is under the driving member. 
     Specifically, a long slot is formed on the driving member and extends along the vertical direction. The frame height adjusting mechanism further includes a lower rivet, an upper rivet, and a third resilient member. A lower end of the long slot is enlarged to receive the lower rivet. A positioning through hole penetrates the inner pipe and is corresponded to the long slot. The upper rivet passes through the positioning through hole and is slidably disposed in the long slot, and the third resilient member is disposed between the upper rivet and the lower rivet and provides a third resilient force for pushing the driving member to slide downwardly relative to the inner pipe. 
     Specifically, the frame height adjusting mechanism further includes an operating member and a connecting wire. The operating member is slidably disposed on the frame. An end of the connecting wire is fixed on the operating member, and the other end of the connecting wire extends along the horizontal pipe and is fixed on the driving member. 
     According to the claimed invention, a frame includes two bottom feet, two lower stands, two upper stands, a bottom pipe, a horizontal pipe, an inner pipe, an outer pipe, a frame height adjusting mechanism. The two bottom feet are disposed oppositely. The two lower stands are vertically fixed on the two bottom feet respectively. The two upper stands sheathes on the two lower stands respectively. The bottom pipe is disposed between the two bottom feet. The horizontal pipe fixed between the two upper stands. The outer pipe slidably sheathes on the inner pipe. A fixing hole is formed on one of the inner pipe and the outer pipe. A plurality of positioning holes is formed on the other one of the inner pipe and the outer pipe along a vertical direction. The inner pipe or the outer pipe where the fixing hole is formed is fixed on a lower end of the horizontal pipe, and the inner pipe or the outer pipe where the fixing hole is not formed is fixed on the bottom pipe. The frame height adjusting mechanism includes a driving member and at least one engaging member. The driving member is slidably disposed on the inner pipe or the outer pipe where the fixing hole is formed. The driving member includes at least one first inclined surface. The at least one engaging member is slidably disposed on the driving member and passing through the fixing hole to insert into one of the plurality of positioning holes. The at least one first inclined surface pushes the at least one engaging member to disengage from the corresponded positioning hole when the driving member slides upwardly. 
     Preferably, the frame further includes a supporting pipe installed on the horizontal pipe. 
     Specifically, the supporting pipe is rectangular. The frame further includes two installing seats disposed on two ends of the horizontal pipe. An engaging slot is formed on each of the two installing seats, and two side pipes of the supporting pipe detachably respectively engage with the two engaging slots. 
     Preferably, the frame further includes a handle fixed between the two upper stands and disposed on tops of the two upper stands. 
     In summary, the present invention utilizes the driving member for driving the at least one engaging member to engage with or disengage from one of the plurality of positioning holes. When the driving member drives the at least one engaging member to disengage from the corresponded positioning hole by sliding upwardly, the outer pipe can slide relative to the inner pipe vertically. After the outer pipe is adjusted to a desired height relative to the inner pipe, the driving member recovers downwardly and drives the at least one engaging member to engage with another positioning hole, so as to lock the outer pipe and the inner pipe. In a practical application, one of the inner pipe and the outer pipe is fixed on one of a lower part and an upper part of the frame, and the other one of the inner pipe and the outer pipe is fixed on the other one of a lower part and an upper part of the frame. Accordingly, an overall height of the frame can be adjusted by sliding movement of the outer pipe relative to the inner pipe. Therefore, a height of a cradle supported by the frame can be adjusted according to actual requirement. 
     These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram of a frame according to a first embodiment of the present invention. 
         FIG. 2  is a partial exploded diagram of the frame according to the first embodiment of the present invention. 
         FIG. 3  is a schematic diagram of a linking member of a frame height adjusting mechanism according to the first embodiment of the present invention. 
         FIG. 4  is a schematic diagram of a driving member, a first resilient member, a second resilient member and an engaging member of the frame height adjusting mechanism according to the first embodiment of the present invention. 
         FIG. 5  is a schematic diagram of an outer pipe and a lower plug according to the first embodiment of the present invention. 
         FIG. 6  is a diagram illustrating that the linking member is installed on a horizontal pipe according to the first embodiment of the present invention. 
         FIG. 7  is an enlarged diagram of an A portion shown in  FIG. 6  according to the first embodiment of the present invention. 
         FIG. 8  is a sectional diagram of the frame along a Y-Z plane according to the first embodiment of the present invention. 
         FIG. 9  is an enlarged diagram of a B portion shown in  FIG. 8  according to the first embodiment of the present invention. 
         FIG. 10  is a partial sectional diagram of the frame along an X-Z plane according to the first embodiment of the present invention. 
         FIG. 11  is an enlarged diagram of a C portion shown in  FIG. 10  according to the first embodiment of the present invention. 
         FIG. 12  is a schematic diagram of a frame according to a second embodiment of the present invention. 
         FIG. 13  is a partial exploded diagram of the frame according to the second embodiment of the present invention. 
         FIG. 14  is a schematic diagram of a driving member, two engaging members, a lower plug, an upper rivet, a lower rivet, and a third resilient member of the frame according to the second embodiment of the present invention. 
         FIG. 15  is a sectional diagram of the frame along a Y-Z plane according to the second embodiment of the present invention. 
         FIG. 16  is an enlarged diagram of a D portion shown in  FIG. 15  according to the second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” etc., is used with reference to the orientation of the Figure(s) being described. The components of the present invention can be positioned in a number of different orientations. As such, the directional terminology is used for purposes of illustration and is in no way limiting. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive. 
     Please refer to  FIG. 1  and  FIG. 2 .  FIG. 1  is a schematic diagram of a frame  1  according to a first embodiment of the present invention.  FIG. 2  is a partial exploded diagram of the frame  1  according to the first embodiment of the present invention. The frame  1  include a bottom pipe  2 , a horizontal pipe  3 , an inner pipe  41 , an outer pipe  42 , two bottom feet  5 , two lower stands  61 , two upper stands  62 , and a frame height adjusting mechanism  100 . The two bottom feet  5  are disposed oppositely. The bottom pipe  2  is fixed between the two bottom feet  5 . The two lower stands  61  are vertically fixed on the two bottom feet  5  respectively. The two upper stands  62  slidably sheathe on the two lower stands  61  respectively. The horizontal pipe  3  is fixed between the two upper stands  62 . The inner pipe  41  is fixed on the bottom pipe  2 . The outer pipe  42  is installed on a lower end of the horizontal pipe  3  and slidably sheathes on the inner pipe  41 . 
     Please refer to  FIG. 3  to  FIG. 5 .  FIG. 3  is a schematic diagram of a linking member  11  of the frame height adjusting mechanism  100  according to the first embodiment of the present invention.  FIG. 4  is a schematic diagram of a driving member  12 , a first resilient member  14 , a second resilient member  15  and an engaging member  10  of the frame height adjusting mechanism  100  according to the first embodiment of the present invention.  FIG. 5  is a schematic diagram of the outer pipe  42  and a lower plug  92  according to the first embodiment of the present invention. The frame height adjusting mechanism  100  includes the engaging member  10 , the linking member  11 , and the driving member  12 . The linking member  11  is slidably disposed on the horizontal pipe  3  along a longitudinal direction of the horizontal pipe  3 . The driving member  12  passes through the horizontal pipe  3  along a vertical direction, i.e., a Z-axis, and the driving member  12  is movable relative to the horizontal pipe  3  along the vertical direction. A second inclined surface  110  is obliquely formed on the linking member  11  from top to bottom. The second inclined surface  110  pushes the driving member  12  upwardly by sliding movement of the linking member  11 . A fixing hole  420  is formed on a front side of a lower end of the outer pipe  42 . A plurality of positioning holes  410  is formed on a side of the inner pipe  41  adjacent to the fixing hole  420  and along the vertical direction. The engaging member  10  is disposed on a lower end of the driving member  12  and passes through the fixing hole  420  to insert into one of the plurality of positioning holes  410 . A first inclined surface  124   a  is obliquely formed on the lower end of the driving member  12  from top to bottom. The first inclined surface  124   a  pushes the engaging member  10  to disengage from the corresponded positioning hole  410  by upward displacement of driving member  12 . 
     In a practical application, a carrier, such as a cradle, can be installed on the horizontal pipe  3  or the two upper stands  62 . The driving member  12  is driven to move upwardly by operating the linking member  11 . When the driving member  12  moves upwardly, the first inclined surface  124   a  on the driving member  12  drives the engaging member  10  to move away from a rear side of the outer pipe  42  and disengage from the corresponded positioning hole  410 , such that the horizontal pipe  3  and the two upper stands  62  can slide up and down, which achieves a purpose of adjusting a height of the carrier. 
     Specifically, the frame height adjusting mechanism  100  further includes an operating member  13 , a connecting wire  131 , the first resilient member  14 , and the second resilient member  15 . The frame  1  further includes a supporting pipe  71 , a handle  72 , a cover  8 , an upper plug  91  and the lower plug  92 . 
     As shown in  FIG. 3 , the linking member  11  is a substantially cuboid structure. An avoiding slot  111  is formed on a middle portion of the linking member  11  and penetrates the linking member  11  along the vertical direction. The avoiding slot  111  extends along a longitudinal direction of the linking member  11 , i.e., a sliding direction of the linking member  11  relative to the horizontal pipe  3 . Two second inclined surfaces  110  are formed on two sides of the avoiding slot  111 , such that each of two side walls of the avoiding slot  111  is formed in a wedge shape. An extending direction of each second surface  110  and a sliding direction of the linking member  11  are located in a same plane, i.e., a Y-Z plane shown in  FIG. 1 . A stopping portion  112  upwardly protrudes from an end of the linking member  11  near a side of two lower ends of the two second inclined surfaces  110 . Furthermore, a protruding column  113  horizontally protrudes from a side of the stopping portion  112  away from the two second inclined surfaces  110 . It should be noticed that the present invention utilizes two second inclined surfaces  110  for stably driving the driving member  12  in this embodiment. However, in another embodiment, there also can be only one second inclined surface  110  formed on the linking member  11  to drive the driving member  12 . 
     As shown in  FIG. 4 , the driving member  12  is a substantially rod-shaped structure. A rectangular portion  120  is formed on an upper end of the driving member  12  and has a rectangular cross section. A guiding column  121  is fixed on a top surface of the rectangular portion  120 . The first resilient member  14  is a spring which sheathes on the guiding column  121 . Two first contacting portions  122  protrude from a front side and a rear side of the rectangular portion  120  respectively and cooperate with the two second inclined surfaces  110  respectively. Specifically, the two first contacting portions  122  are columns protruding from the front side and the rear side of the rectangular portion  120 . In this embodiment, in order to simplify assembly, the rectangular portion  120  can be drilled for allowing a pin to pass through the rectangular portion  120 , so as to form the two first contacting portions  122 . A thickness of a middle portion of the driving member  12  along an up and down direction, i.e., an X axis, becomes thinner than a thickness of the rectangular portion  120  along the front and back direction. The middle portion of the driving member  12  is connected to a rear connecting area of the rectangular portion  120  via an inclined surface. A long hole  123  is formed on the lower end of the driving member  12  and penetrates the driving member  12  along the front and back direction. A U-shaped portion  124  with an upward opening protrudes from a front side of the lower end of the driving member  12 . The U-shaped portion  124  is formed along an outer periphery of the long hole  123  and encloses a lower part of the long hole  123 . A bottom wall of the U-shaped portion  124  is formed in an arc shape. The first inclined surface  124   a  is formed on each of two upper ends of two side walls of the U-shaped portion  124  which is located at two sides of the long hole  123 . The two first inclined surfaces  124   a  obliquely extend toward a front side of the driving member  12  from top to bottom. 
     The engaging member  10  passes through the long hole  123  and is slidably received in the long hole  123 . Two ends of the engaging member  10  are exposed out of the front side and a rear side of the driving member  12  respectively. A second contacting portion  101  is disposed near a front end of the engaging member  10  and contactably cooperates with the two first inclined surfaces  124   a . Specifically, the engaging member  10  is a pin of a rotating structure, and the second contacting portion  101  is a flange protruding from an outer periphery of the engaging member  10 . A diameter of the flange is larger than a width of the long hole  123 , and therefore the flange can abut against the front side of the driving member  12 . It should be noticed that the flange and the engaging member  10  can be two separate structures in this embodiment, and the flange fixedly sheathes on the engaging member  10 . However, in another embodiment, the flange and the engaging member  10  can be integrally formed. Obviously, when the engaging member  10  slides downwardly within the long hole  123  and relative to the driving member  12 , the two first inclined surfaces  124   a  push the engaging member  10  by the second contacting portion  101 . 
     Furthermore, similar to the second inclined surface  110 , the present invention utilizes two first inclined surfaces  124   a  for pushing the engaging member  10  stably in this embodiment. However, in another embodiment, there also can be only one first inclined surface  124   a  to drive the engaging member  10 . That is, a side wall, instead of the U-shaped portion  124 , protrudes from a side of the long hole  123 , and one first inclined surface  124   a  is formed on an upper end of the side wall. 
     Besides, the second resilient member  15  is a spring which sheathes on the front end of the engaging member  10 . A rear end of the second resilient member  15  abuts against the second contacting portion  101 . 
     As shown in  FIG. 2  to  FIG. 5 , the inner pipe  41  and the outer pipe  42  are non-circular pipes having U-shaped cross sections and internal reinforce structure. An installing seat  20  is disposed on a middle portion of the bottom pipe  2 . A chamber is formed inside the installing seat  20 . A shape of the chamber is corresponded to a shape of the inner pipe  41 , such that the inner pipe  41  is inserted into the installing seat  20  to fix with the bottom pipe  2 . The upper plug  91  is detachably connected to an upper end of the inner pipe  41 . The plurality of positioning holes  410  is formed on a recess portion formed on a front side of the inner pipe  41 . 
     A recess area  421  is formed on a front side of the outer pipe  42 . The fixing hole  420  is formed on a bottom wall of the recess area  421 . Two installing holes  422  are further formed on the outer pipe  42  and outside the recess area  421 . The two installing holes  422  are located at two sides of the fixing hole  420  respectively. The lower plug  92  is detachably inserted into the lower end of the outer pipe  42 . The lower plug  92  includes a sliding portion  921  slidably received in the recess area  421 . A through hole  920  is formed on the sliding portion  921  and corresponded to the fixing hole  420 . The lower plug  92  further includes two resilient plates  922  disposed on two sides of the sliding portion  921 . A protrusion  923  is disposed on each of the two resilient plates  922 . When the lower plug  92  is inserted into the outer pipe  42 , the two protrusions  923  are pressed and the two resilient plates  922  are deformed. When the two protrusions  923  move to locations corresponded to the two installing holes  422 , the two resilient plates  922  recover and the two protrusions  923  pass through the two installing holes  422 , so as to install the lower plug  92  on the outer pipe  42 . Furthermore, an upper end of the outer pipe  42  can be detachably connected or welded to the horizontal pipe  3 . 
     Detail installation process of the frame  1  and the frame height adjusting mechanism  100  is described as follows. Please refer to  FIG. 6  and  FIG. 7 .  FIG. 6  is a diagram illustrating that the linking member  11  is installed on the horizontal pipe  3  according to the first embodiment of the present invention.  FIG. 7  is an enlarged diagram of an A portion shown in  FIG. 6  according to the first embodiment of the present invention. The horizontal pipe  3  fixed between the two upper stands  62  is a flat pipe. A sliding slot  30  is sunk from a top surface of the horizontal pipe  3  and extends along the longitudinal direction of the horizontal pipe  3 . A width of the sliding slot  30  is corresponded to a width of the linking member  11 . An opening is formed on a middle portion of the sliding slot  30  for allowing the driving member  12  to pass through. The linking member  11  is slidably disposed in the sliding slot  30 . The stopping portion  112  upwardly protrudes out of the sliding slot  30 . The two second inclined surfaces  110  face toward one of the two upper stands  62 , which is the upper one shown in  FIG. 6 . The operating member  13  is slidably installed on the one of the two upper stands  62 . More specifically, the operating member  13  is a ring-shaped structure and sheathes on the upper stand  62  where the operating member  13  is installed. A recess slot  620  is formed on an inner side of the upper stand  62 , where the operating member  13  is installed, for guiding the operating member  13 . A protruding structure is disposed on an outer side of the operating member  13  for easy operation. An end of the connecting wire  131  is fixed with the operating member  13 . The connecting wire  131  extends downwardly along the upper stand  62 , where the operating member  13  is installed, and bends to extend along the horizontal pipe  3 . The other end of the connecting wire  131  is fixed with the linking member  11 . In this embodiment, the connecting wire  131  can be a steel wire. Preferably, a horizontal rod or a small roller can be disposed on a location where the upper stand  62  is connected to the horizontal pipe  3 , so as to bend the connecting wire  131 . Since the connecting wire  131  connects the operating member  13  and the linking member  11 , when the operating member  13  is pushed upwardly, the linking member  11  is driven to slide toward the upper stand  62 , where the operating member  13  is disposed. It is not required to push the linking member  11  manually and has an advantage of easy operation. 
     After the linking member  11  is installed, the upper end of the driving member  12  without the two first contacting portions  122  passes through the horizontal pipe  3  and the linking member  11  from bottom to top. Afterwards, the pin passes through the rectangular portion  120  to form the two first contacting portions  122 . The rectangular portion  120  of the driving member  12  is slidably received in the avoiding slot  111  of the linking member  11 , and the two first contacting portions  122  abut against the two lower ends of the two second inclined surfaces  110  respectively. The first resilient member  14  sheathes on the guiding column  121  on the rectangular portion  120 . It should be noticed that the driving member  12  is just located within the recess area  421  of the outer pipe  42 , and the U-shaped portion  124  of the driving member  12  faces forwardly at this moment. 
     Please refer to  FIG. 8  and  FIG. 9 .  FIG. 8  is a sectional diagram of the frame  1  along the Y-Z plane according to the first embodiment of the present invention.  FIG. 9  is an enlarged diagram of a B portion shown in  FIG. 8  according to the first embodiment of the present invention. As shown in  FIG. 6 ,  FIG. 8 , and  FIG. 9 , the cover  8  is installed on the horizontal pipe  3  by a connecting member, such as a screw, and covers the linking member  11 . An abutting portion  81  downwardly protrudes from a top wall of the cover  8 . The abutting portion  81  abuts against a side of the stopping portion  112  facing toward the two second inclined surfaces  110 . A circular hole  82  is formed on the cover  8  and penetrates the abutting portion  81 . The circular hole  82  receives the guiding column  121  and allows the guiding column  121  to pass through upwardly. The cover  8  positions the driving member  12  by the circular hole  82 . 
     The first resilient member  14  sheathing on the guiding column  121  is pressed by the cover  8 . An upper end of the first resilient member  14  resiliently abuts against a bottom surface of the abutting portion  81 . A lower end of the first resilient member  14  resiliently abuts against the top surface of the rectangular portion  120 . Since the cover  8  is fixed on the horizontal pipe  3 , the first resilient member  14  provides a first resilient force for pushing the driving member  12  downwardly. 
     As shown in  FIG. 4  to  FIG. 6 , the driving member  12  is movably disposed in the horizontal pipe  3  up and down and is slidable relative to the outer pipe  42 . Specifically, a guiding slot  423  is formed on an upper end of the recess area  421  of the outer pipe  42  along the vertical direction. A rear end of the rectangular portion  120  of the driving member  12  is slidably received in the guiding slot  423 . The guiding slot  423  guides the driving member  12  to slide up and down. 
     Please refer to  FIG. 10  and  FIG. 11 .  FIG. 10  is a partial sectional diagram of the frame  1  along an X-Z plane according to the first embodiment of the present invention.  FIG. 11  is an enlarged diagram of a C portion shown in  FIG. 10  according to the first embodiment of the present invention. As shown in  FIG. 10  and  FIG. 11 , the driving member  12  is located in the recess area  421  of the outer pipe  42  after installation. The long hole  123  formed on the lower end of the driving member  12  is opposite to the fixing hole  420  formed on the outer pipe  42 . The U-shaped portion  124  is formed on a side of the driving member  12  away from the rear side of the outer pipe  42 . The two first inclined surfaces  124   a  obliquely extend away from the rear side of the outer pipe  42  from top to bottom. A rear end of the engaging member  10  passes through the long hole  123  and the fixing hole  420  to insert into one of the plurality of positioning holes  410  from front to back sequentially. The front end of the engaging member  10  passes through the through hole  920  formed on the lower plug  92  connected to the outer pipe  42 . At this moment, the second contacting portion  101  on the engaging member  10  abuts against two front ends of the two first inclined surfaces  124   a . The second resilient member  15  sheathing on the front end of the engaging member  10  is pressed by the lower plug  92 . A front end of the second resilient member  15  resiliently abuts against the lower plug  92 . A rear end of the second resilient member  15  resiliently abuts against the second contacting portion  101 . Since the lower plug  92  is fixed on the outer pipe  42 , the second resilient member  15  provides a second resilient force for pushing the engaging member  10  rearwardly to engage with one of the plurality of the positioning holes  410 . 
     As shown in  FIG. 2 , the supporting pipe  71  and the handle  72  of the frame  1  are formed in rectangular shapes. The supporting pipe  71  is installed on the horizontal pipe  3 . The handle  72  is installed between the two upper stands  62  and located on two upper portions of the two upper stands  62 . Two installing seats  31  are disposed on two sides of the horizontal pipe  3 . An engaging slot is formed on each of the two installing seats  31 , such that two side pipes of the supporting pipe  71  detachably engage with the two installing seats  31 , so as to install the supporting pipe  71  on the horizontal pipe  3 . The supporting pipe  71  and the handle  72  are for installing, supporting and mounting a carrier, such as a cradle. 
     In order to recover the linking member  11  which is pulled by the operating member  13 , a recovering member, which is not shown in the figures, can be disposed between the linking member  11  and the cover  8 . The recovering member can be specifically a spring sheathing on the protruding column  113 . An end of the recovering member resiliently abuts against a side of the stopping portion  112  away from the two second inclined surfaces  110 . The other end of the recovering member abuts against an inner side wall of the cover  8 . Since the cover  8  is fixed on the horizontal pipe  3 , the recovering member provides a recovering force for pushing the linking member  11  to slide along a direction of an arrow as shown in  FIG. 9 , and to abut against the abutting portion  81 . 
     Operational principle and process of the frame height adjusting mechanism  100  and the frame  1  of the first embodiment of the present invention is described as follows. 
     The two first contacting portions  122  on the driving member  12  abut against the two lower ends of the two second inclined surfaces  110 . The engaging member  10  passes through the long hole  123 , the fixing hole  420 , and one of the plurality of positioning holes  410  sequentially. The second contacting portion  101  on the driving member  12  abuts against the two upper ends of the two first inclined surfaces  124   a . When it is desired to adjust a height of the frame  1 , it is to push the operating member  13  upwardly, such that the operating member  13  slides along the upper stand  62  and drives the linking member  11  to slide relative to the horizontal pipe  3  and toward the upper stand  62  where the operating member  13  is installed. When the linking member  11  slides, the first resilient member  14  is compressed, and the driving member  12  is lifted by abutment between the two second inclined surfaces  110  and the two first contacting portions  122 . When the driving member  12  is lifted, the engaging member  10  is driven by the two first inclined surfaces  124   a  and the second contacting portion  101  abutting against each other to slide forwardly, i.e., the engaging member  10  slides away from the rear side of the outer pipe  42 . The engaging member  10  compresses the second resilient member  15  and disengages from the corresponded positioning hole  410 . At this moment, the horizontal pipe  3  and the two upper stands  62  can be lifted or pressed, such that the outer pipe  42  slides relative to the inner pipe  41 . When the height of the frame  1  is adjusted to a desired position, it is to release the operating member  13 , such that the driving member  12  moves downwardly by the first resilient force of the first resilient member  14 . When the driving member  12  moves downwardly, the two first inclined surfaces  124   a  do not abut against the engaging member  10  anymore, such that the engaging member  10  is driven to slide rearwardly to engage with another engaging hole  410  by the second resilient force of the second resilient member  15 , so as to complete adjustment of the height of the frame  1 . 
     Please refer to  FIG. 12  to  FIG. 13 .  FIG. 12  is a schematic diagram of a frame  1 ′ according to a second embodiment of the present invention.  FIG. 13  is a partial exploded diagram of the frame  1 ′ according to the second embodiment of the present invention. As shown in  FIG. 12  and  FIG. 13 , in this embodiment, the frame  1 ′ includes a bottom pipe  2 ′, a horizontal pipe  3 ′, an inner pipe  41 ′, an outer pipe  42 ′, the two bottom feet  5 , the two lower stands  61 , the two upper stands  62 , the supporting pipe  71 , the handle  72 , a cover  8 ′, an upper plug  91 ′, a lower plug  92 ′, and a frame height adjusting mechanism  100 ′. The frame height adjusting mechanism  100 ′ includes two engaging members  10 ′, a driving member  12 ′, the operating member  13 , the connecting wire, a third resilient member  14 ′, an upper rivet  16 , and a lower rivet  17 . Structures of the bottom pipe  2 ′, the two bottom feet  5 , the two lower stands  61 , the two upper stands  62 , the supporting pipe  71 , and the handle  72  of the second embodiment are similar to the ones of the first embodiment. Furthermore, structural connections between the aforementioned parts of the second embodiment are similar to the ones of the first embodiment. 
     The horizontal pipe  3 ′ is fixed between the two upper stands  62 . Since the frame height adjusting mechanism  100 ′ does not include a linking member, a sliding slot is not required to be formed on a top surface of the horizontal pipe  3 ′. Instead, an opening is formed on a middle portion of the horizontal pipe  3 ′ and penetrates the horizontal pipe  3 ′ for allowing the connecting wire to pass through. 
     The inner pipe  41 ′ and the outer pipe  42 ′ are hollow pipes having substantially elliptical cross sections. The inner pipe  41 ′ is fixed on a lower end of the horizontal pipe  3 ′. The outer pipe  42 ′ is fixed on the bottom pipe  2 ′ and slidably sheathes on the inner pipe  41 ′. The cover  8 ′ is disposed above the horizontal pipe  3 ′ and inserted into the inner pipe  41 ′ downwardly to seal an opening formed on an upper end of the inner pipe  41 ′. A gap is formed on the cover  8 ′ for allowing the connecting wire to pass through. The upper plug  91 ′ is inserted into an upper end of the outer pipe  42 ′ and sheathes on the inner pipe  41 ′. Structural connection between the upper plug  91 ′ and the outer pipe  42 ′ of the second embodiment is similar to structural connection between the outer pipe  42  and the lower plug  92  of the first embodiment. 
     Please refer to  FIG. 14 .  FIG. 14  is a schematic diagram of the driving member  12 ′, the two engaging members  10 ′, the lower plug  92 ′, the upper rivet  16 , the lower rivet  17 , and the third resilient member  14 ′ of the frame  1 ′ according to the second embodiment of the present invention. As shown in  FIG. 13  and  FIG. 14 , a positioning through hole  411 ′ is formed on each of a front wall and a rear wall of a lower end of the inner pipe  41 ′. A chamber with an upward opening is formed on the lower plug  92 ′ for receiving the driving member  12 ′. A circular hole  920 ′ is formed on the lower plug  92 ′ and corresponded to the positioning through hole  411 ′. The lower plug  92 ′ is inserted into a lower part of the inner pipe  41 ′. The upper rivet  16  passes through the positioning through hole  411 ′ and the circular hole  920 ′, so as to fix the lower plug  92 ′ on the inner pipe  41 ′. 
     Two fixing holes  410 ′ are formed on two sides of the lower end of the inner pipe  41 ′ respectively. Two rows of the positioning holes  420 ′ are formed on two sides of the outer pipe  42 ′ along the vertical direction. The two rows of the positioning holes  420 ′ are corresponded to the two fixing holes  410 ′. 
     Please refer to  FIG. 15  and  FIG. 16 .  FIG. 15  is a sectional diagram of the frame  1 ′ along a Y-Z plane according to the second embodiment of the present invention.  FIG. 16  is an enlarged diagram of a D portion shown in  FIG. 15  according to the second embodiment of the present invention. As shown in  FIG. 14  to  FIG. 16 , two sliding slots  120 ′ are formed on an upper end of the driving member  12 ′. The two sliding slots  120 ′ extend obliquely and penetrate the driving member  12 ′. A distance between two upper ends of the two sliding slots  120 ′ is larger than a distance between two lower ends of the two sliding slot  120 ′. A first inclined surface  120   a ′ is defined by an outer side wall of each of the two sliding slots  120 ′. A hollow chamber is formed in the driving member  12 ′ and communicates with the two sliding slots  120 ′. Two first openings  121 ′ are formed on two sides of the driving member  12 ′ and communicate with the hollow chamber. A long slot  122 ′ is formed on the driving member  12 ′ along the vertical direction and located under a midpoint between the two sliding slots  120 ′. A lower end of the long slot  122 ′ is enlarged to receive the lower rivet  17 . A diameter of the lower rivet  17  is larger than a width of an upper end of the long slot  122 ′, such that the lower rivet  17  is restrained from sliding relative to the long slot  122 ′. The driving member  12 ′ is slidably disposed in the inner pipe  41 ′. Precisely, the driving member  12 ′ is slidably received in the lower plug  92 ′. Two second openings  921 ′ are formed on the lower plug  92 ′ and corresponded to the two first openings  121 ′. The two first openings  121 ′, the two second openings  921 ′ and the two fixing holes  410 ′ are adjacent sequentially and communicate with one another. An inner bottom surface of the lower plug  92 ′ is located under the driving member  12 ′, such that the lower plug  92 ′ can push the driving member  12 ′ upwardly. 
     Each of the two engaging member  10 ′ includes a locking member  101 ′ and a sliding pin  102 ′ protruding from a side of the locking member  101 ′. Specifically, a through hole  101   a ′ is formed on the locking member  101 ′. The sliding pin  102 ′ passes through the through hole  101   a ′ and protrudes from two sides of the locking member  101 ′. However, in another embodiment, the sliding pin  102 ′ and the locking member  101 ′ can be integrally formed. 
     The two locking members  101 ′ are slidably received in the driving member  12 ′. Two ends of the two locking members  101 ′ protrude from the two sides of the driving member  12 ′ through the two first openings  121 ′ and pass through the two second openings  921 ′ and the two fixing holes  410 ′. The two sliding pins  102 ′ of the two engaging members  10 ′ are slidably disposed in the two sliding slots  120 ′. When the two ends of the two locking members  101 ′ pass through the two fixing holes  410 ′ to engage with the corresponded positioning holes  420 ′ on the outer pipe  42 ′, the two sliding pins  102 ′ are located at the two upper ends of the two sliding slots  120 ′. A distance between each of the two lower ends of the two sliding slots  120 ′ and the corresponded fixing hole  410 ′ is larger than a distance between each of the two upper ends of the two sliding slots  120 ′ and the corresponded fixing hole  410 ′. The two first inclined surfaces  120   a ′ are located near the two fixing holes  410 ′ corresponded to the two engaging members  10 ′. Therefore, when the driving member  12 ′ slides upwardly, the locking member  101 ′ is driven to slide inwardly to disengage from the corresponded positioning hole  420 ′. 
     Furthermore, the upper rivet  16  passes through the driving member  12 ′ and is slidably disposed in the long slot  122 ′, the upper rivet  16  is located above the lower rivet  17 , and the third resilient member  14 ′ can be a spring disposed between the upper rivet  16  and the lower rivet  17 . Since the upper rivet  16  and the lower rivet  17  are fixed on the inner pipe  41 ′ and the driving member  12 ′ respectively, the third resilient member  14 ′ provides a third resilient force for recovering the driving member  12 ′ to slide downwardly relative to the inner pipe  41 ′. 
     As shown in  FIG. 12 , the operating member  13  is slidably installed on one of the two upper stands  62 . An end of the connecting wire is fixed with the operating member  13 . The connecting wire extends downwardly along the upper stand  62  where the operating member  13  is installed, and the connecting wire bends to extend along the horizontal pipe  3 ′. Finally, the other end of the connecting wire stretches into the inner pipe  41 ′ and is fixed with the upper end of the driving member  12 ′. Similar to the first embodiment, the connecting wire of the second embodiment can be a steel wire. 
     Operational principle and process of the frame height adjusting mechanism  100 ′ and the frame  1 ′ of the second embodiment of the present invention are described as follows. As shown in  FIG. 12  and  FIG. 16 , the operating member  13  is pulled upwardly to slide along the upper stand  62  and drives the driving member  12 ′ to slide upwardly in the inner pipe  41 ′, i.e., the lower plug  92 ′, by the connecting wire. When the driving member  12 ′ slides upwardly, the two first inclined surfaces  120   a ′ of the two sliding slots  120 ′ push the two sliding pins  102 ′ inwardly. The two sliding pins  102 ′ drive the two locking members  101 ′ fixed with the two sliding pins  102 ′ to slide relative to the driving member  12 ′ inwardly and disengage from the corresponded positioning holes  420 ′. At this moment, the frame  1 ′ is unlock, and the horizontal pipe  3 ′ and the two upper stands  62  can be lifted or pressed to adjust a height of the frame  1 ′. When the horizontal pipe  3 ′ is lifted, the lower plug  92 ′ disposed on the lower end of the inner pipe  41 ′ drives the driving member  12 ′ to move upwardly. When the frame  1 ′ is adjusted to a desired position, the operating member  13  is released, such that the driving member  12 ′ is driven to slide downwardly by the third resilient force of the third resilient member  14 ′. The other two inclined surfaces of the two sliding slots  120 ′ opposite to the two first inclined surfaces  120   a ′ push the two sliding pins  102 ′ outwardly, such that the two locking members  101 ′ slide out of the driving member  12 ′ and pass through the two fixing holes  410 ′ to engage with another corresponded positioning holes  420 ′, which firmly positions the frame  1 ′ at the desired position. 
     In contrast to the prior art, the present invention utilizes the driving member for driving the at least one engaging member to engage with or disengage from one of the plurality of positioning holes. When the driving member drives the at least one engaging member to disengage from the corresponded positioning hole by sliding upwardly, the outer pipe can slide relative to the inner pipe vertically. After the outer pipe is adjusted to a desired height relative to the inner pipe, the driving member recovers downwardly and drives the at least one engaging member to engage with another positioning hole, so as to lock the outer pipe and the inner pipe. In a practical application, one of the inner pipe and the outer pipe is fixed on one of a lower part and an upper part of the frame, and the other one of the inner pipe and the outer pipe is fixed on the other one of a lower part and an upper part of the frame. Accordingly, an overall height of the frame can be adjusted by sliding movement of the outer pipe relative to the inner pipe. Therefore, a height of a cradle supported by the frame can be adjusted according to actual requirement. 
     Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.