Patent Document

FIELD OF THE INVENTION 
   The instant invention relates to a wrench for use in limited access areas and areas requiring a small turning arc. 
   BACKGROUND OF THE INVENTION 
   There are a number of wrenches currently available that can be used to tighten or loosen a nut or headed bolt. One type of flat wrench is of a fixed size and shaped to fit a single nut or bolt, while a wrench with adjustable jaws can be used for nuts or bolts of varying sizes. Socket wrenches are also made to fit a specific nut or bolt. All of these wrenches require a turning arc that is determined by the shape of the nut or bolt. When the socket or jaws of the wrench is shaped like the nut or bolt head, a specific turning arc is needed for the wrench to be effective. For example, a square nut or bolt requires a minimum turning arc of 90° while a hexagonal nut or bolt requires a minimum turning arc of 60°. This means that the wrench must be turned at least by the minimum arc before it can be removed from the nut and reseated. In many instances the location of the nut or bolt does not provide enough space to permit the use of such wrenches. Wrenches with ratchet mechanisms are also well known, but are subject to breakage under excessive forces and can usually be rotated in only one direction. 
   Doughty, in U.S. Pat. No. 1,355,455, teaches a ratcheted socket wrench specifically designed for use in automobiles where there is limited access to certain nuts and bolts. This wrench has two rotatable ratchet wheels, each on an opposite side of a shank. The two wheels are rotatable with the socket member and wrench head. There is a pawl associated with each ratchet wheel and a pawl releasing member for each side. When the wrench is rotated in one direction one wheel is engaged and the pawl on the other side is released. When rotated in the opposite direction the other wheel is engaged and the first pawl is released. This wrench can be use to both tighten and loosen a nut or bolt and uses a small turning arc, but the mechanism can be subject to breakage under pressure. Summers teaches a wrench designed for use on Ford automobiles in areas with very limited access. (U.S. Pat. No. 1,434,635) The bolt engaging part of the wrench is a spring loaded ratchet mechanism controlling the rotation of a socket. The wrench has a handle consisting of a long solid rod with an L-shaped configuration. The end is bent over upon itself to provide a hand grip. Additionally, the wrench head can be rotated 180° and held fast by a set screw. The combination of handle shape and two head positions enables access to tight areas. Another socket wrench designed for use in motor vehicles has a long thin flat handle with an L-shaped end portion for use as a grip and to provide leverage. The long handle provides access to tight areas. This patent teaches the use of a hexagonal socket interior and also suggests the use of a square, octagonal or fluted socket interior. (Curtis, U.S. Pat. No. 2,601,800) 
   A wrench consisting of two pieces is taught by Faw in U.S. Pat. No. 1,504,035. A simple socket has an elongated barrel with an axial hexagonal passage and a transverse round passage. A straight handlebar of hexagonal cross section fits the axial passage tightly and the transverse passage loosely. To seat the nut the handlebar is placed in the axial passage and is rotated between the palms of the hands until the nut is screwed as tightly as possible. The handlebar is then inserted into the transverse passage providing considerable leverage to complete the tightening of the nut. In the axial position the wrench can be used in a limited space, but when it is necessary to make the nut tight, a much larger turning area is required since the transverse use requires the full area traversed by the handlebar. 
   A novel bolt or nut head is taught by Newell et al. in U.S. Pat. No. 3,482,481. The head is frustoconical with two sets of grooves. The grooves in each set are parallel and oblique to the generatrix of the cone. One set of grooves slants to the right and the other to the left. The cooperating wrench has two ends, each with a frustoconical socket having one set of ribs, the set at one end corresponding to the right slanting grooves and the set at the other end corresponding to the left slanted grooves. One end of the wrench is used to tighten the bolt and the other to loosen it. The frustoconical shape requires the wrench to be separated only a small distance from the bolt head but the turning arc is determined by the spacing of the ribs. The wrench and bolt head must be used as a combination and neither can accommodate or be accommodated by conventional hardware. 
   British patent No. 16,793 to Delacroix describes a rod having one end with five surfaces, each with a raised cross. The rod is used with a set of sockets to fit different sized nuts. Each socket has two notches in its upper surface. The notches cooperate with the crosses. Each cross connects the rod to the socket at a different angle which enables access to a different limited space. German patent No. 575,904 to Forst shows a socket wrench consisting of a shank with connecting means at both ends and a socket member with two sockets of different interior diameters set at right angles to each other. Each socket interior cooperates with one end of the shank. The socket not attached to the shank forms the usable part of the wrench. This wrench can only be used with nuts and bolts of sizes corresponding to the socket selected. 
   Patent 604,812 from Great Britain describes a one piece socket wrench with a fluted socket interior specifically designed for use when the nut is so close to a wall that the socket cannot fit over the nut. A part of the exterior wall of the socket is ground off to form a sloping face. The socket is placed over the nut with the ground face adjacent to the wall or other obstruction. The nut is turned as far as possible and the socket is removed and reseated. 
   The ratchet wrenches described above are subject to breakage under large forces while many of the other wrenches are made for specific uses and are not practical for general usage. There is a need for a wrench that can be used to tighten or loosen a nut or bolt situated in any hard to reach area and where only a small turning arc is available. There is a need for a wrench that has minimal components and can withstand the large forces often necessary to remove a nut or bolt that has been in place for a long time. There is a need for a wrench that is adaptable for nuts and bolts of different sizes and shapes and one that is inexpensive and simple to manufacture. 
   BRIEF SUMMARY OF THE INVENTION 
   The instant invention may provide a socket wrench for use in tight areas where there is limited access or a very small turning arc or both. The wrench may have two basic components and no moving parts. The wrench may not be damaged under the stress of normal use and may be used with nuts and bolts of various shapes. Accommodations may be made for nuts and bolts of different sizes. 
   It is an object of the instant invention to provide a wrench that can be used where there is limited access to the site of the nut or bolt to be tightened or loosened. 
   An object of the instant invention is to provide a wrench that can be used where there is only enough space for a small turning arc. 
   It is another object of the instant invention to provide a wrench that is easy and inexpensive to manufacture. 
   A further object of the instant invention is to provide a wrench with a socket that can be used with nuts and bolts of different shapes. 
   A still further object of the instant invention is to have a wrench that can be rotated to the right or to the left as needed without adjustments or alterations. 
   Another object of the instant invention is to provide a wrench that is strong enough to withstand considerable force without becoming damaged or distorted. 
   A further object of the instant invention is to provide a wrench that enables resetting the handle with minimal separation of the handle from the socket. 
   Another object of the instant invention is to provide a wrench that requires no separation of the socket from the nut or bolt while the handle is reset. 
   A still further object of the instant invention is to have a wrench that can be used by a right-handed or left-handed person with equal ease. 
   A wrench for use in limited access areas to tighten or remove nuts and bolts comprises a hollow cylindrical socket having vertically fluted interior walls and a handle assembly comprising a horizontal shaft and a cylindrical head fixedly attached to one end of the shaft, the head having a vertically fluted exterior to complement the fluted interior walls of the socket, and the head being insertable into the socket for driving rotation thereof by movement of the shaft through an arc. When the socket is placed over a nut or bolt and the head is inserted into the top of the socket the shaft can be rotated thereby causing the socket and the nut or bolt to be rotated with it and thereafter the head is lifted clear of the socket, returned to the starting position, and reinserted into the socket so the shaft can be rotated again, and these steps are repeated as needed to tighten or remove the nut or bolt. 
   A wrench for use in limited access areas to tighten or remove nuts and bolts comprises a hollow cylindrical socket having fluted interior walls; a horizontal partition dividing the interior of the socket into an upper chamber and a lower chamber, the walls of the upper chamber and the fluting in the upper chamber converging inwardly toward the partition, and the walls of the lower chamber and the fluting in the lower chamber being vertical; and a handle assembly comprising a horizontal shaft and a frustoconical head fixedly attached to one end of the shaft, the head having a fluted exterior to complement the fluted interior walls of the upper chamber of the socket, and the head being insertable into the socket for driving rotation of the socket by movement of the shaft through an arc. When the socket is placed over a nut or bolt and the head is inserted into the upper chamber of the socket so that the fluted exterior of the head cooperates with the fluted interior of the upper chamber the shaft can be rotated thereby causing the socket and with it the nut or bolt to be rotated, and thereafter the head is lifted upwardly of the socket a distance sufficient only to permit the flutings to separate and the shaft to be returned to the starting position and thereafter the head is reinserted into the socket so the shaft can be rotated again, and these steps repeated as needed to tighten or remove the nut or bolt. 
   An extension for use with a wrench of a type having a socket with fluted interior walls and a handle assembly having a head complementing the interior of the socket and affixed to one end of a shaft that comprises an upper body member having a circular recess with fluted walls dimensioned to accept the head of the handle assembly, a rod having a first end and a second end and being fixedly attached at its first end to the bottom of the upper body member at the center thereof, a lower body member being cylindrical with a fluted exterior, dimensioned to be matingly accepted within the socket, and affixed to the second end of the rod; and retention means disposed within the lower body member for retaining said lower body member within said socket. When the lower body member is inserted into and retained within the socket and the handle assembly is inserted into the upper body member the wrench can be used in areas with very limited access to tighten and loosen nuts and bolts. 
   A handle assembly for driving rotation of a socket of a type having fluted interior walls comprises a rod having a first end and a second end and a U-shaped portion substantially near the first end, a hand grip rotatably affixed to the first end of the rod, a head being cylindrical with a fluted exterior and dimensioned to be matingly accepted within the socket affixed to the second end of the rod, and retention means disposed within the head for retaining said head within said socket. When the head is inserted into and retained within the socket and the user holds the hand grip in one had and the vertical part of the U-shaped portion of the rod in the other hand and rotates the rod, the socket is rotated thereby rotating a nut or bolt held within the socket and situated in a limited access area. 
   A wrench for use in limited access areas to tighten or remove nuts and bolts comprises a hollow cylindrical socket having an upper portion and a lower portion, said upper portion having fluted exterior walls and said lower portion having vertically fluted interior walls and a handle assembly that comprises a horizontal shaft and a cylindrical head fixedly attached to one end of the shaft, the head having a circular recess in the underside, the recess having fluted walls to complement and cooperate with the fluted exterior walls of the upper portion of the socket, and the head being superposable onto the upper portion of the socket for driving rotation thereof by movement of the shaft through an arc. When the socket is placed over a nut or bolt and the head is superposed onto the upper portion of the socket the shaft can be rotated thereby rotating the socket and the nut or bolt and thereafter the head is lifted from the socket, returned to the starting position, and repositioned onto the socket so the shaft can be rotated again, and these steps are repeated as needed to tighten or remove the nut or bolt. 
   Other features and advantages of the invention will be seen from the following description and drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWING 
       FIG. 1  is a cutaway perspective view of one form of the device of the instant invention; 
       FIG. 2  is a side plan view of the handle assembly; 
       FIG. 3  is a top plan view of the handle assembly; 
       FIG. 4  is a perspective view of a portion of the shaft and the head; 
       FIG. 5  is a cutaway perspective view of the device of  FIG. 1  with a nut; 
       FIG. 6  is a bottom plan view of the device of  FIG. 1  with a nut; 
       FIG. 7  is a cutaway perspective view of a second embodiment of the device of the instant invention; 
       FIG. 8  is a side plan view of a second form of the handle assembly; 
       FIG. 9  is a top plan view of the second form of the handle assembly; 
       FIG. 10  is a side plan view of the connecting pin; 
       FIG. 11  is a cutaway perspective view of a third embodiment of the device of the instant invention; 
       FIG. 12  is section through line  12 — 12  of  FIG. 11 ; 
       FIG. 13  is a side plan view of a third form of the handle assembly; 
       FIG. 14  is a side plan view of the third form of the handle assembly with pivot pin and spring in place; 
       FIG. 15  is an exploded view of the third embodiment of the instant invention; 
       FIG. 16  is a top plan view of a handle assembly showing a small turning angle; 
       FIG. 17  is a top plan view of a handle assembly showing larger turning angle; 
       FIG. 18  is a sectional view of the second embodiment of the instant invention showing the clearing distance for the head; 
       FIG. 19  is a sectional view of the third embodiment of the instant invention showing the clearing distance for the head; 
       FIG. 20  is a perspective view of one additional socket; 
       FIG. 21  is a perspective view of a second additional socket; 
       FIG. 22  is perspective view of an extension for the head for hard to reach areas; 
       FIG. 23  is a perspective view of an alternate handle assembly for hard to reach areas; and 
       FIG. 24  is a perspective view of an alternate handle assembly head and socket. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   A first embodiment of the instant invention may consist of two parts, the socket  30  and the handle assembly  31 . The socket  30 , seen in  FIGS. 1 and 5 , may be a hollow cylinder that may have axially fluted interior walls. The fluting  32  may provide a good grip on nuts and bolts having different shapes, i.e., square or hexagonal. An example of a hexagonal nut  36  within the socket  30  may be seen in  FIGS. 5 and 6 . The handle assembly  31  may have a solid cylindrical head  33  with fluting  34  on its outer surface which may cooperate with and complement the fluting  32  of the interior of the socket  30 . The head  33  may be attached to one end of a shaft  35 . The shaft  35  may be affixed to the head  33  by welding or other means known in the art. The head  33  and shaft  35  may also be of singular construction. See  FIGS. 2 ,  3  and  4 . The head  33  may be inserted into the top of the socket  30  to form a socket wrench. 
   To use the wrench the socket  30  may be placed over the nut  36  or bolt (not shown) and the head  33  of the handle assembly  31  inserted into the top of the socket  30 . The shaft  35  may be rotated in one direction as far as possible, then the head  33  lifted until it may be separated from the socket  30  so the shaft  35  may be rotated to the starting position, reseated in the socket  30  and rotated again. These steps may be repeated until the nut or bolt is tightened sufficiently or removed, as needed. The smaller the available turning arc, the more often these steps must be repeated to complete the task. The fluted interior of the socket and exterior of the head may enable use of this wrench when only a very small turning arc is available. 
   A second embodiment of the instant invention may also consist of a hollow cylindrical socket  40  and handle assembly  41 . Referring to  FIG. 7 , the socket  40  may be divided into two interior compartments, an upper compartment and a lower compartment, by means of a transverse partition  46 . The interior walls of both compartments may be fluted. The fluting  42  of the upper compartment may have the same tooth size and arrangement as in the lower compartment, or it may be different, according to usage and method of manufacture. There may be a depression or opening  47  with threaded walls centrally located on the upper surface of the partition  46 . Alternatively, a threaded nut or small cylinder (not illustrated) may be welded to the center of the partition. The handle assembly  41  may also consist of a solid cylindrical head  43  with a fluted  44  outer surface and a shaft  45 . There may be a smooth bore  48  through the end of the shaft  45  and extending through the center of the head  43 .  FIGS. 8 and 9 . 
   A pin  37  having one threaded end  38  and one flattened end forming a stop  39  ( FIG. 10 ) may be a part of the wrench. The pin  37  may be inserted downwardly through the bore  48  and fastened into the opening  47  in the partition  46  by mating the threading  38  of the pin  37  with the threaded wall of the opening  47  in the partition  46 . The length of the pin  37  may be slightly greater than the sum of the thickness of the shaft  45 , the depth of the head  43 , and the depth of the upper compartment of the socket  40 . The diameter of the pin  37  may be slightly smaller than the diameter of the bore  48  so that the pin  37  may be easily inserted through the bore  48  and so that the head  43  may be smoothly moved upward and downward while the pin  37  remains fixed in the opening  47  in the partition  46 . The stop  39  of the pin  37  may be larger than the bore  48  so that the head  43  may not slip off the end of the pin  37 . The pin  37  may be used to prevent the head  43  from becoming completely disengaged from the socket  40  and so the head  43  may be quickly and accurately reinserted into the socket  40  for greater efficiency during use. 
   In operation, the head  43  may be set into the upper compartment of the socket  40  where the fluting  44  of the head  43  and the fluting  42  of the socket  40  may be in intimate cooperation. The pin  37  may be inserted through the bore  48  and held in place by means of the treaded opening  47 . The socket  40  may be placed over the nut or bolt to be manipulated and the shaft  45  rotated as far as space may permit. The handle assembly  41  may then be lifted upward until the fluting  44  of the head  43  is no longer in cooperation with the fluting  42  of the socket  40  while the pin  37  may prevent complete separation of two components. The shaft  45  may then be rotated in the reverse direction and the head  43  lowered back into the socket  40 . These steps may be repeated as many times as necessary until the nut or bolt is as tight as desired or as loose as desired. 
   A third embodiment of the instant invention may be the most efficient when operating in a limited space. A socket  50  may be constructed in a similar manner to socket  40 , having a partition  56  separating the interior into two compartments. There may be a threaded depression or opening  57  in the center of the upper surface of the partition  56 . The lower compartment may have fluting  59  as previously noted. However, the fluting  52  in the upper compartment may converge inwardly toward the partition  56 . See  FIGS. 11 and 12 . To accommodate the converging fluting  52  in the upper compartment, the handle assembly  51  may be altered accordingly. The head  53  of the handle assembly  51  may be frusto-conical in shape and may have fluting  54  on its exterior surface to cooperate with the converging fluting  52  of the upper compartment of the socket  50 . There may be a bore  58  through the end of the shaft  55  of the handle assembly  51  and through the head  53  as seen in  FIG. 13 . A pin  60  with a threaded end  61  may be disposed within the bore  58  and screwed into the threaded opening  57  in the partition  56  of the socket  50 . The socket  50  and handle assembly  51  form a wrench that is operable as described above. However, the inward sloping fluting  52  and frusto-conical head  53 , enable the user to reset the wrench by merely lifting the handle assembly  51  a very small distance above the socket  50 . This dissociates the two components sufficiently to rotate the handle assembly  51  in either direction and reinsert it into the socket  50 . These steps may be repeated as necessary and the turning arc may be as great or as small as the working space permits. The pin  60  of the third embodiment  50  need only be slightly longer than the thickness of the shaft  55  and the depth of the head  53  taken together. 
   A small turning arc A may be seen in  FIG. 16 , while a larger turning arc B is illustrated in  FIG. 17 . When the straight sided socket  40  is used, the head  43  must be lifted upward a distance equal to the full depth of the head  43 , the distance C as seen in  FIG. 18 , before the head  43  may be reinserted. The advantage of the alternately shaped system of the third embodiment may be evident in reviewing  FIG. 19  which may illustrate the small distance D the head  53  must be lifted to disengage the two components before rotating and reseating the head  53 . 
   To further increase the efficiency of the wrench, a compression spring  62  may surround the lower portion of the pin  60  extending beyond the bottom of the head  53 . A washer  63  may be placed against the spring  62  before the pin  60  is screwed into the threaded opening  57  in the partition  56  of the socket  50 . The pin  60  may have a flattened or enlarged stop  64  at the top so the head  53  may be restrained by the pin  60  from becoming completely separated from the socket  50  even under the tension of the spring  62 . See  FIGS. 14 and 15 . 
   To operate the wrench composed of socket  50 , handle assembly  51 , and pin  60  with the spring  62 , the components may be put together as illustrated in  FIG. 15 . The socket  50  may be placed over the nut or bolt to be rotated and the shaft  55  pressed downward to engage the flutings  52  and  54 . The shaft  55  may then be rotated to the left or right as needed and through the turning distance or arc as permitted by the accessible space. When rotated as far as possible the pressure on the shaft  55  may be released so that the spring  62  forces the head  53  upward. The length of the pin  60  may be dimensioned to permit the head to be raised just far enough to disengage the fluting  54  of the head  53  from the fluting  52  of the socket  50 . The frusto-conical shape of the head  53  and the corresponding shape of the upper compartment of the socket  50  may enable a very short distance D through which the head  53  must be raised to disengage the head  53  from the socket  50 . See  FIG. 19 . Once the flutings are disengaged the user may rotate the shaft in either direction as far as permitted by the available space and thereafter press the shaft  55  downward to re-engage the components. The above described steps may be repeated until the nut or bolt is tightened sufficiently or removed. 
   It should be noted that if the socket  40  and handle assembly  41  of the second embodiment are used with the pin  37 , a spring and washer may be used also. For these components, the pin  37 , as noted above must be long enough to raise the head  44  above the socket  40  in order to disengage the flutings, with or without the assist of the spring. See  FIG. 18 . 
   The fluted socket may enable one socket to accommodate a variety of nuts and bolts of different shapes and, within limitations, different sizes. One single handle assembly may be used with more than one socket as long as the upper compartments of the sockets are of the same dimensions and have the same fluting arrangement to cooperate with the fluting of the head. The socket may then have a lower compartment with a smaller diameter to accommodate smaller nuts and bolts as seen in  FIG. 20 , or a lower compartment with a larger diameter as seen in  FIG. 21  to accommodate larger nuts and bolts. The wrench may be sold in combinations with one handle assembly and several sockets. There may be more than one such wrench combination to accommodate most common nut and bolt sizes. 
   At times the nut or bolt to be rotated may be recessed in such a way that the handle assembly cannot reach into the area. An extender  65  may be used with the wrench. A typical extender  65  seen in  FIG. 22  may have a female cylindrical upper member  66  of comparable dimensions as the upper compartment of the socket and having the same fluting  67 . One end of a rod  68  may be affixed to the underside of the upper member  66  and the other end of the rod  68  may be affixed to a solid cylindrical male member  69 . The male member  69  may have fluting  70  about its outer surface to cooperate with the fluting of the upper compartment of the socket. In operation, the male member  69  of the extender  65  may be inserted into the upper compartment of the socket so that the user may extend the socket into the recessed area and place it over the nut or bolt to be rotated. To insure that the socket does not separate from the extender  65  a spring loaded ball  71  or other retention means known in the art may be placed within a recess in the male member  69  to hold it in place within the socket. The handle assemblies  35  and  45  described above may be used with the extender  65  in the described manner. Handle assembly  51  may require the interior fluting of the upper member of the extender to converge downwardly so as to accommodate the head  53 , and the male member to be frustoconical in shape. 
   When the nut or bolt to be rotated may be situated within a recess with insufficient room to permit any rotation of the handle assembly an alternate handle assembly may be used. One type of alternate handle assembly  72  may be seen in  FIG. 23 . A configured rod  73  may have a U-shaped section  74  near the top. There may be hand grip  75  rotatably affixed to the top of the rod  73 . A solid cylindrical male member  76  with fluting  77  about its outer surface may be affixed to the bottom of the rod  73 . In operation, the male member  76  may be inserted into the upper compartment of the socket in the same manner as noted above for the extender  65 . To insure that the socket does not separate from the male member  76 , a spring loaded ball  78  or other retention means known in the art may be placed within a recess in the male member  76 . The combination unit may then be lowered to the site of the nut or bolt to be rotated and placed over the nut or bolt. The hand grip  75  may be held in one hand and the vertical portion  79  of the U-shaped section of the rod  73  may be held in the other hand. The rod  73  may then be rotated using both hands and the nut or bolt may be rotated with it. This alternate handle assembly  72  may also be used when a nut or bolt is resistant to rotation when only a small rotation arc is available, since the added leverage obtained by the use of two hands may provide an advantage. Also, continued rotation may be possible when using the alternate handle  72  since it may not have to be reset after each rotation. A similar alternate handle assembly with a frustoconical male member may be used with the socket  50  of the third embodiment. 
   The various embodiments of the sockets of the instant invention may be manufactured from one single cylinder, more especially socket  30 . The other embodiments, sockets  40  and  50  may be made from one piece or they may be made from two sections welded together with the partition welded between the two sections. 
   It may also be noted that the wrench may be made with an alternate socket  80  which may have a male member  81  as its upper section and a female member  82  as the head of the handle assembly  83 . A set of two or more sockets with different sized lower compartments may be accommodated by the same handle assembly  83 . 
   While several embodiments of the instant invention have been illustrated and described in detail, it is to be understood that this invention is not limited thereto and may be otherwise practiced within the scope of the following claims.

Technology Category: 7