Patent Publication Number: US-9833887-B1

Title: Replaceable magnetic screw-locking depth positoining head

Description:
BACKGROUND OF THE INVENTION 
     1. Fields of the Invention 
     The present invention relates to a positioning head, more particularly to a replaceable magnetic screw-locking depth positioning head. 
     2. Description of the Related Art 
     With reference to  FIGS. 6 and 7  for a conventional positioning head, the conventional positioning head comprises a main body formed by a rod  50  and a positioning sleeve  52 , a tool member  501  extended from an end of the rod  50 , and a latch slot  502  concavely formed between the tool member  501  and the rod  50  and latched to a buckling ring  62 , wherein the positioning sleeve  52  is formed by combining an abutting member  521  and a sleeve member  522 . An abutting surface  54  is disposed parallel to a surface of the abutting member  521 , and a containing slot  56  is concavely formed on an inner surface of the abutting member  521 , and a magnetic member  58  is installed in the containing slot  56 , and a hole  581  is formed on the magnetic member  58 , and a free end of the sleeve member  522  has an opening  523 , and a ring abutting slot  60  is formed between the opening  523  and the containing slot  56 , and the opening  523 , the ring abutting slot  60  and the containing slot  56  are communicated with one another. In the aforementioned structure, when the tool member  501  is passed into the positioning sleeve  52  and the hole  581 , the buckling ring  62  is latched to the ring abutting slot  60 . 
     Although the magnetic member  58  provides a screw suction force, there is no extra room of the containing slot  56  to accommodate the chips produced the tool member  501  during the screwing process after the magnetic member  58 , so that the chips fall all over the place. When the screw is locked to a certain extent, an end of the tool member  501  will not be able to move further due to the chips. 
     SUMMARY OF THE INVENTION 
     Therefore, it is a primary objective of the present invention to provide a positioning head, particularly a replaceable magnetic screw-locking depth positioning head, that provides the space for accommodating the chips and also provides a more convenient installation of the buckling ring, and reduces the vibration when the screw is latched to the tool member to achieve good manufacturing efficiency, production efficiency and manufacturing precision. 
     According to the invention, a replaceable magnetic screw-locking depth positioning head comprises a main body, formed by a rod, a positioning sleeve, a buckling ring, a cushioning member and a magnetic member. 
     According to the invention, the rod has a position limiting surface disposed at an end thereof, and a position increasing member is axially extended from the position limiting surface, and a ring groove is concavely formed at the other end of the position increasing member opposite to the position limiting surface, and a tool member is axially extended and protruded from the ring groove, and the ring groove has a radial cross-sectional diameter smaller than a radial cross-sectional diameter of a connecting end of the tool member and the ring groove, and the positioning sleeve having an abutting member from which a sleeve member is concavely extended; 
     According to the invention, the abutting member has a flat abutting surface, and an inner side has a first slot concavely formed thereon, and an inner side of the joint between the sleeve member and the abutting member has a second slot concavely formed thereon, and the second slot has a radial cross-sectional diameter smaller than the radial cross-sectional diameter of the first slot, and the second slot has a ring abutting edge concavely formed at the other end opposite to the first slot, and the ring abutting edge has a radial cross-sectional diameter smaller the radial cross-sectional diameter of the second slot, and the first slot, the second slot and the ring abutting edge jointly form a stepped slot; 
     According to the invention, the sleeve member has a sleeve bottom surface disposed at a free end thereof, and a penetrating hole passes through the center of the sleeve bottom surface, and the penetrating hole has a radial cross-sectional diameter smaller than the radial cross-sectional diameter of the ring abutting edge, and the penetrating hole and the stepped slot are communicated with each other; wherein the buckling ring is installed at the ring abutting edge; 
     According to the invention, the cushioning member and the magnetic member are disposed at the second slot, and the cushioning member has an end abutting the buckling ring and the other end abutting the magnetic member, and a first through hole passes through the center of the cushioning member, and a second through hole passes through the center of the magnetic member, thereby, the tool member is passed into to the penetrating hole, the first through hole and the second through hole, so that the ring groove is latched to the buckling ring. 
     The present invention has the following advantages: 
     1. The abutting surface of the positioning sleeve is arranged horizontally, so that when a screw is locked to the main body, and the abutting surface is contacted with a wall surface, the rod will be restricted to be locked by the screw further, so as to prevent locking the screw into a too-large depth and control the locking depth of each screw precisely in order to avoid unequal heights. When the tool member is worn out to a certain extent, users simply remove the rod, and sheath another rod to the positioning sleeve for a continual use, so as to reduce the manufacturing cost and improve competitiveness. 
     2. Since the stepped slot has a stepped structure with the first slot greater than the second slot and the second slot greater than the ring abutting edge, the stepped slot can be manufactured easily, and the buckling ring can be installed to the ring abutting edge conveniently to improve the production efficiency of the positioning sleeve. If it is necessary to replace the worn buckling ring, the users will simply need to remove and replace the cushioning member and the magnetic member. 
     3. In screwing, the position limiting surface abuts the sleeve bottom surface while pressing the abutting surface to touch the wall surface, so as to prevent the screw from being locked to a too-large depth. The position increasing member provides an error tolerance for installing the rod and the error tolerance acts as a buffering distance between the position limiting surface and the sleeve bottom surface when the main body is screwed and locked. 
     4. The cushioning member has the buffering/shock absorbing effect, so that a better manufacturing precision of the tool member is achieved. 
     5. The first slot provides an accommodating space, so that when the tool member is used, chips of the wall surface on which the tool member works are created, and the chips will be stored in the first slot. 
     6. The magnetic member provides a suction force, so that when the screw is latched to the tool member, the positioning head is more stable and will not fall out easily, so as to improve the work yield and efficiency. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accomplishment of this and other objects of the invention will become apparent from the following description and its accompanying drawings of which: 
         FIG. 1  is a perspective view of the present invention; 
         FIG. 2  is an exploded view of the present invention; 
         FIG. 3  is a cross-sectional view of a positioning slot combined with a rod of the present invention; 
         FIG. 4  is a first schematic view of a using status of a main body combined with a screw in accordance with the present invention; 
         FIG. 5  is a second schematic view of a using status of a main body combined with a screw in accordance with the present invention; 
         FIG. 6  is an exploded view of a prior art; and 
         FIG. 7  is a cross-sectional view of the prior art. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference to  FIGS. 1 to 3  for a replaceable magnetic screw-locking depth positioning head of the present invention, the replaceable magnetic screw-locking depth positioning head comprises a main body  10  formed by a rod  12 , a positioning sleeve  20 , a buckling ring  30 , a cushioning member  32 , and a magnetic member  34 . 
     An end of the rod  12  is disposed on a position limiting surface  121 , and a position increasing member  14  is axially extended from the position limiting surface  121 , and a ring groove  16  is concavely formed at the other end of the position increasing member  14  opposite to the position limiting surface  121 , and a tool member  18  is axially extended and protruded from the ring groove  16 , wherein the ring groove  16  has a radial cross-sectional diameter smaller than the radial cross-sectional diameter of the connecting end of the tool member  18  and the ring groove  16 . 
     The positioning sleeve  20  has an abutting member  22  from which a sleeve member  24  is concavely extended. 
     The surface of the abutting member  22  is a flat abutting surface  221 - 2 , and a first slot  261  is concavely formed on an inner surface of the abutting member  22 , and a second slot  262  is formed on an inner surface of a joint of the sleeve member  24  and the abutting member  22 . The second slot  262  has a radial cross-sectional diameter smaller than the radial cross-sectional diameter of the first slot  261 , and a ring abutting edge  263  is concavely formed at the other end of the second slot  262  opposite to the first slot  261 , and the ring abutting edge  263  has a radial cross-sectional diameter smaller than the radial cross-sectional diameter of the second slot  262 . The first slot  261 , the second slot  262  and the ring abutting edge  263  jointly form a stepped slot  26 . 
     A sleeve bottom surface  241  is disposed at a free end of the sleeve member  24 . A penetrating hole  264  is formed and passed through the center of the sleeve bottom surface  241 , and the penetrating hole  264  has a radial cross-sectional diameter smaller than the radial cross-sectional diameter of the ring abutting edge  263 , and the penetrating hole  264  and the stepped slot  26  are penetrated and communicated with each other. 
     The buckling ring  30  is installed to the ring abutting edge  263 . 
     The cushioning member  32  and the magnetic member  34  are installed to the second slot  262 , and the cushioning member  32  has an end abutting the buckling ring  30  and the other end abutting the magnetic member  34 , and a first through hole  321  is passed through the center of the cushioning member  32 , and a second through hole  341  is passed through the center of the magnetic member  34 . 
     With the aforementioned structure, the tool member  18  is passed into the penetrating hole  264 , the first through hole  321  and the second through hole  341 , so that the ring groove  16  is latched to the buckling ring  30 . 
     Wherein, the position increasing member  14  is an equidistant, equal-height circular member, and the position increasing member  14  has a radial cross-sectional diameter smaller than the radial cross-sectional diameter of the position limiting surface  121  and the penetrating hole  264 . 
     With reference to  FIGS. 4 and 5  together with  FIG. 2 , a screw  40  is installed to the tool member  18 , such that when the rod  12  is rotated, the tool member  18  is driven to rotate at the internal diameter of the cushioning member  32  and the magnetic member  34  while driving the screw  40  into a wall surface  42 . Now, a plurality of chips falls into the first slot  261  during the screwing process. When the abutting surface  221  abuts at the wall surface  42 , and the position limiting surface  121  abuts the sleeve bottom surface  241 , the tool member  18  will be unable to move in the direction towards the wall surface  42  anymore, so that the depth of the screw  40  entering into the wall surface  42  meets the user&#39;s expected depth. 
     Since the magnetic member  34  has a strong magnetic field, therefore a stable positioning effect of the screw  40  can be achieved even the screw  40  is not in contact. 
     When the rod  12  is rotated, the cushioning member  32  can provide the effect of absorbing the vibration caused by the rotation of the tool member  18  to improve the manufacture precision. 
     Many changes and modifications in the above-described embodiments of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims.