Abstract:
The present invention provides an improved quick rewind tape measure having dual modes of manual and power tool assisted operation. A quick rewind tape measure is formed by rotatably placing in an outer case a reel for winding a tape, providing a handle oil the outer side of the case so that the reel can be rotated by the handle to rewind a measuring tape. The handle of the tape measure has dual modes of operation, both manual and power tool assisted. With the power tool assisted mode of operation, the measuring tape can be rewound in a high speed. Consequently, the tape measure has the advantage that an elongate measuring tape having a length of more than 10 m, particularly 50 m to 300 m can be rewound quickly.

Description:
This invention relates to tape measures, particularly a quick rewindable tape. 
   BACKGROUND OF THE INVENTION 
   A tape measure has hitherto been made by rotatably placing a reel in an outer case and winding a measuring tape around the reel to house the tape in the case when unused. There has been a tape measure in which a coil spring is provided in the interior of the reel and the measuring tape can be automatically rewound around the reel by the restoring force of the spring. This type of tape measure generally been utilized when the tape has a comparatively short length, particularly less than a length of 10 m. Since it is difficult to rewind the tape by the restoring force of a spring when the measuring tape is of a length from 10 m to 100 m, tape measures have been made so that the measuring tape can be rewound by rotating a handle by hand. Tape measures of this kind were prepared by rotatably placing a reel in a case to enable winding the tape around the reel and also by providing a side of the case with a handle for rotating the reel. 
   SUMMARY OF THE INVENTION 
   The present invention aims to eliminate the disadvantages known in the field and to provide an improved quick rewind tape measure having dual modes of manual and power tool assisted operation. 
   According to the present invention there is provided a quick rewind tape measure formed by rotatably placing in an outer case a reel for winding a tape, providing a handle on the outer side of the case so that the reel can be rotated by the handle to rewind a measuring tape. The handle of the tape measure has dual modes of operation, both manual and power tool assisted. With the power tool assisted mode of operation, the measuring tape can be rewound at a high speed. Consequently, the tape measure has the advantage that an elongate measuring tape having a length of more than 10 m, particularly 50 m to 300 m can be rewound quickly. 
   The invention provides a dual-mode rewindable tape measure apparatus having manual and power tool assisted rewinding modes of operation including a tape measure housing and a spool rotatably supported by the housing about an axis of rotation. An elongated tape measure blade is attached to the spool and wound thereabout. A rewind handle is connected to the spool in a manner such that rotation of the rewind handle causes rotation of the spool about the axis and rewinding of the blade onto the spool in a manual mode of operation. A drive fitting is attached to the rewind handle in a manner such that rotation of a power tool driver engaged with the drive fitting causes rotation of the drive fitting and the attached rewind handle and spool to rewind the blade onto the spool in a power tool assisted mode of operation. 
   In a preferred embodiment of the invention, the rewind handle is a foldable handle that in an unfolded, open position allows the rewind handle to be rotated to rewind the tape measure blade by the manual mode of operation, and that in a folded, closed position, allows the power tool driver to engage the drive fitting attached to the rewind handle to rewind the tape measure blade by the power assisted mode of operation. 
   In an alternative embodiment of the invention, the rewind handle is a foldable handle that in an unfolded, open position allows the rewind handle to be rotated to rewind the tape measure blade by the manual mode of operation, and allows the power tool driver to engage the drive fitting attached to the rewind handle to rewind the tape measure blade by the power assisted mode of operation. 
   The foldable handle includes a first piece attached to the spool, and a second piece hinged to the first piece. The drive fitting is attached to the second piece on an outer surface of the second piece in a manner such that the drive fitting is engagable by the power tool driver when the foldable handle is in the folded, closed position. 
   The foldable handle comprises a first piece attached to the spool, and a second piece hinged to the first piece. The drive fitting is attached to the first piece in a manner such that the drive fitting is engagable by the power tool driver when the foldable handle is in the unfolded, open position. 
   The rewind handle has an axis of rotation that is concentric with an axis of rotation of the drive fitting, and both axes are concentric with the axis about which the spool is rotated such that a ratio of rotation of the rewind handle or the drive fitting to rotation of the spool is 1:1. 
   The drive fitting may also include a rivet nut fastened to the rewind handle and a screw engaging the rivet nut. The screw has a head that engages the power tool driver according to the desires of the user. 
   The tape measure apparatus is applicable with a housing that is enclosed to protect The tape measure blade. Alternatively, the tape measure housing may he open to allow debris to fall away from the tape measure blade. 
   Yet further, the winder and the shaft are made of a hard thermoplastic resin, and therefore can be easily manufactured. Even when they are rotated at a high speed, they generate less noise. 
   The invention brings about various advantages as mentioned above. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention is explained below referring to the accompanying drawings, in which: 
       FIG. 1  is a perspective view of a tape measure according to a preferred embodiment of the invention; 
       FIG. 2  is a perspective view of a tape measure according to a second embodiment of the invention; 
       FIG. 3  is a side view of the tape measure of  FIG. 2 , partly in section; 
       FIG. 4  shows another embodiment of the tape measure according to the invention partly cut away; 
       FIG. 5  is a front view of another type of tape measure according to the invention; and 
       FIG. 6  is a partial sectional view of the tape measure of  FIG. 5  taken along line VI-VI. 
   

   DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
   Referring to  FIG. 1 , a preferred embodiment of a tape measure  1  according to the invention is show The tape measure  1  has an outer case  10  which houses a reel or spool  12  (shown in phantom) around which a tape measure blade  14  is wound. The tape measure  12  depicted is a closed reel type of tape measure which encloses and protects the blade  14  when not in use. The outer case  10  is provided with a finger grip  16  which enables a user to grasp the tape measure in a secure manner. One side of the outer case  10  is provided with a handle  20  for manually rewinding the blade  14  onto the reel  12 . A preferred embodiment of the handle  20  for rewinding the blade is shown in  FIG. 1 . The handle  20  is a foldable handle which is in a closed, folded position. The foldable handle  20  has a two piece  22 ,  24  construction. The two pieces  22 ,  24  are connected by a hinge  26  which allows the movable piece  24  of the handle to fold open from the closed position to all open extended position in which a user may wind turn the handle by knob  28 . A handle shaft (not show in  FIG. 1 ) of the handle  20  is attached to the spool  12  in such a manner that when the handle  20  is rotated, the spool  12  is also rotated and the blade  14  of the tape measure is rewound onto the spool  12 . The handle, handle shaft, and spool all rotate about axis A. Thus, the first mode of operating the rewindable tape measure is a manual rewind mode. 
   The tape measure  1  is further provided with a second mode of operating, to rewind the blade  14  onto the spool with the assistance of a power tool. In  FIG. 1 , a drive fitting, such as a screw  3 O, is shown in the center of the handle  20  along axis A while in the folded, closed position. The screw  30  is attached to the handle  20  in such a manner that if the screw  30  is turned, the handle shaft and attached spool  12  are rotated and the blade  14  of the tape measure  1  is rewound on the spool  12 . The screw may have a Phillips head, square head, torx head, nut head, etc., which a power tool easily engages to turn the screw. For example a Phillips head may be desired if the power tool available to the user is a power screw driver. A square headed screw may be more desirable if the user prefers using a power drill. A power tool  40  is exemplified having a nut driver  42  or the like for engaging the drive fitting  30  and a shaft  44  gripped in a chuck of the power tool. Because the screw  30  is attached to the handle shaft and the spool  12  in the manner described above, upon engagement of the driver  42  of the power tool  40  with the screw  30  and rotation of the driver  42 , the tape measure blade is automatically rewound by the power tool assistance. Considering the high rpms of a power tool, it will be appreciated how quickly a long blade of the tape measure  1  can be rewound in the power tool assisted second mode of operating compared to the manual handle wind first mode of operation. 
   The invention offers the user dual mode operation, for instance for a 5 m measure, it is convenient to open the foldable handle and manually rewind the tape measure blade. However, when the reel is directly connected with and rotated by the handle to rewind the measuring tape having the length of 50 m around the reel, one hundred fifty rotations of the handle are required for rewinding the measuring tape and operations for rewinding the measuring tape are troublesome. It would clearly be preferable on such a long measure to have the option provided by the invention to close the foldable handle and engage a power tool with the drive fitting or screw to save time and quickly rewind the blade of the tape measure. 
   Referring now to  FIGS. 2 and 3 , a second embodiment of a tape measure according to the invention is shown with like elements numbered the same as in  FIG. 1  The tape measure  1  is provided once again with the foldable winding handle  20 , which is shown in the unfolded, open position. It can seen with the handle  20  in the open position that the two pieces  22 ,  24  of the handle are connected by the hinge  26 , and the movable piece  24  rotates about axis B to the open position. The drive fitting or screw  30  in this embodiment is attached to the inner piece  22  of the handle  20  along the axis of rotation A of the handle shaft  32 , rather than on the outside of the foldable piece  22  of the handle as in the first embodiment. In this case, it will be understood that the handle need not a foldable handle, but also could be constructed as a one piece handle, eliminating the hinge  26 . In  FIG. 3 , it is clear that the handle shaft  32  may be formed integrally with the handle  20 , and that the spool  12  is attached in a manner so as to rotate with the handle shaft. The spool  12  is provided with flanges  34  having a large diameter at each of both sides of shaft  32 , which is provided with a means (not shown) for fastening the end of the measuring tape blade  14  to the shaft  32 . The handle shaft  32  is supported by bearings  36  which may be formed integrally on the inner walls of outer case  10 , or in any conventional manner to allow for rotation of the handle shaft  32  and spool  12 . The screw  30  is attached to the handle  20  in such a manner that if the screw  30  is turned, the handle shaft and attached spool  12  are rotated and the blade  14  of the tape measure  1  is rewound on the spool  12 . Because the screw  30  is attached to the handle shaft and the spool  12  in the manner described above, upon engagement of the driver  42  of the power tool  40  with the screw  30  and rotation of the driver  42 , the tape measure blade is automatically rewound by the power tool assistance. 
   Referring now to  FIG. 4 , a tape measure  1  according to a third embodiment of the invention is shown with a wall of the outer case  10  cut away. A rivet nut  46  is inserted and fastened directly into the shaft  32  of the spool through an aperture (not shown) in the outer wall of the outer case  10 . In this particular instance the rewind handle is on the other side (not seen) of the tape measure  1 . The rivet nut  40  engages a screw  30  to be screwed into the rivet nut. This enables the user to readily change the desired screw head to engage with an associated driver  42  of the power tool  40 . When the power tool  40  is attached via the driver  42  to the screw  30  set in the rivet nut  40 , the shaft  32  and spool  12  rotate to rewind the blade  14  onto the spool  12 . It will be understood that the rivet nut may by utilized in the previous embodiments as a substitute for the drive fitting being directly attached to the handle pieces. This provides the user with more options to select a desired drive fitting to be attached into the rivet nut. 
   Referring now to  FIGS. 5 and 6 , a tape measure  2  is shown having dual mode rewind operation according to the invention. The tape measure  2  has a case  50  which houses a reel or spool  52  around which a tape measure blade  54  is wound. The tape measure  12  depicted is an open reel type of tape measure having an open reel design which allows dirt, sand and other debris to fall away from the case  50  and blade  54 . The case  50  is provided with a handle  56  which enables a user to grasp the tape measure  2  in a secure manner. One side of the case  50  is provided with a rewind handle  20  for manually rewinding the blade  54  onto the reel  52 . The handle depicted in  FIG. 6  is identical to handle of the first embodiment shown in  FIG. 1 , and is described above. The power tool  40  is shown attached to the tape measure  2  by the driver  42  being engaged with the drive fitting  30  on the outside of the folded handle  20 . It will be understood that rotation of the driver  42  by the power tool  40  rotates the drive fitting connected to the handle  20  and thereby rotates the spool shaft  32  and spool  52 . 
   Suggested materials and construction for the tape measure according to the invention follow. The tape measure outer case may be constructed from ABS plastic or PVC coated metal. The measuring tape blade  14  is made of a band steel, a fiber-reinforced synthetic resin band or the like, and has usually a length of 50 m to 100 m. The blade can be provided with a folding end hook or ring. Graduations or marking are provided on the blades. Handle  20 , handle shaft  32  and spool  12  are preferably made of hard thermoplastic synthetic resin, for example such as polyacetal. Gearing may be provided between the handle shaft and spool to increase the ratio spool rotations to handle shaft rotations such as 3:1 rather than the 1:1 ratio shown herein. 
   It is readily apparent that the above-described tape measure meets all of the objects mentioned above and also has the advantage of wide commercial utility. It should be understood that the specific form of invention described herein is intended to be representative only, as certain modifications within the scope of these teachings will be apparent to those skilled in the art.