FR2650774A1 - DEVICE FOR QUICK ADJUSTMENT OF TOOL JAWS - Google Patents

Abstract

Hand tool 10 comprising a fixed jaw 16 and a movable jaw 14, a fixed handle 12 having a receiving part 32, a screw 24 which cooperates with the receiving part, and jaw adjusting means 20 for internal cooperation between the jaws and a position adjustment of said movable jaw relative to said fixed jaw. Screw 24 has a plurality of individual and distinct first threads extending along its longitudinal axis; said receiving portion 32 is defined by a threaded hole 38 provided in the fixed handle 12, said threaded hole comprising a plurality of individual and distinct second threads which can thread with said plurality of first threads of the screw; so that the greatest speed of advance of the screw in the axial direction, resulting from the screwing by rotation of the plurality of said first threads of the screw and of the plurality of said second threads of the tapped hole, acting on said means for adjusting the jaw 20, substantially increases the speed of adjustment of the movable jaw relative to the fixed jaw.

Description

* 1

  DEVICE FOR QUICK ADJUSTMENT OF TOOL JAWS.

  The present invention relates to hand tools and more particularly tools using a pair of jaws between which a piece is received.

to work.

  The common elements of locking pliers, locking wrenches and the like employing a certain type of tilt locking control are a fixed jaw and a movable jaw provided for locking a workpiece therebetween. A mechanism comprising an adjusting element which acts on the movable jaw is usually provided to adjust the interval between the jaws and bring them into possible initial contact with a workpiece, before the very large forces of the tilting action are begotten

and applied.

  The tools of the type -described here are usual-

  used in cases where quick and efficient adjustment

  This gap between the jaws is not only very desirable but absolutely necessary. An example of such use is a chain welding operation in which a welder has very little time to adjust the tool before welding two

  successive pairs of elements having different dimensions

  annuities. In this case, it is very important to adjust the

  between the jaws of the locking tool

  so as to take into account as quickly as possible the dimensions

  sions of a new pair of elements.

  A device of known type performs this adjustment of the interval between the jaws by rotation of a single threaded and single pitch adjusting screw at which

  the movable jaw is connected directly or indirectly-

  is lying. This method and this adjustment device are necessary.

  slower and this results in a waste of precious time

  to adjust tools from one dimension to another.

  The object of the present invention is to avoid the above drawbacks and to provide a hand tool comprising a fixed jaw and a movable jaw, the interval between the jaws of which can be adjusted so

fast and precise.

  In accordance with the present invention, a hand tool is obtained comprising a fixed jaw and a movable jaw, a fixed handle comprising a

  receiving part, a screw which couples with the

  receiving tie, and jaw adjustment means for internal cooperation between the jaws and for adjusting the position of the movable jaw relative to

  to the fixed jaw, characterized in that said screw

  carries a plurality of first individual and distinct threads extending along its longitudinal axis; said receiving part is defined by a tapped hole provided in the fixed handle, this tapped hole comprising a plurality of second individual and distinct threads which can be screwed with said plurality of first

  screw threads; so that the screwing by rota-

  tion of the plurality of said first threads of the screw and of the plurality of said second threads of the tapped hole generates a greater advance speed of

  the. screw in the axial direction, acting on said mo-

  yen adjustment jaw, which significantly increases the speed of adjustment of the movable jaw compared to

the fixed jaw.

  In addition to the foregoing, the invention

  tion includes other provisions which stand out

  from the description which follows.

  The invention will be better understood with the help of the

  Description below, which refers to the accompanying drawings.

  attached in which: Figure 1 is a side view of long nose pliers using the invention;

  Figure 2 is a side view with section through

  tial of curved jaw pliers, using the invention

  tion; Figure 3 is a partial view on a larger scale of a threaded device shown in Figures 1 and 2; Figure 4 is an end view of a screw;

  Figure 5 is a partial section of the lines

screw stages;

  Figure 6 is a partial view of a tenail-

  blocking by tilting; Figure 7 is a perspective view of a chain locking pliers; Figure 8 is a perspective view of a locking weld clamp; and Figure 9 is a perspective view of a

sheet metal tool.

  It should be understood, however, that these drawings and the corresponding descriptive parts are

  given only as an illustration of the subject matter of the

  vention, of which they in no way constitute a limitation. As best seen in Figure 1, the clamp

  long nose blocking is generally designated by the re-

  father 10 and it includes a handle 12 and a movable clamping member or lower jaw 14. The handle 12 comprises a fixed clamping member or upper jaw 16. A tilting mechanism comprises a handle

  elongated 18 and a tilting link 20 which can pivot

  ter at one end, in the usual way, around an axis 22.

  The other free end (shown in dotted lines) of the tilting link 20 is in contact with the handle 12 and in particular with the stop end (also shown in dotted lines) of an adjustment screw 24 which is screwed so suitable for the end of the handle 12. The operation of the screw is described below. The front end of the handle 18 is preferably in the form of a yoke or fork and an angle of the movable jaw 14 is appropriately arranged inside the fork or between the arms of the yoke by means of a pivot 19. Similarly, the handle 12 is preferably of U-profile and receives another part of it. 'angle of the

  movable jaw 14 which is also appropriately fixed

  requested to the handle 12 by a pivot 17.

  Elastic means 25, preferably in the form of a helical tension spring, are fixed between the handle 12 and the movable clamping element 14 or

  lower jaw, so as to tend to distance the element

  loosening 14 of the fixed clamping element when

the jaws are open.

  An elongated release lever 28 is pivotally mounted, via a shaft 80, within the handle member 18 and

  has a part extending forward (as shown

  shown in dotted lines) which can come into contact with

  a boss 82 of the tilting link 20 which is direct

  towards the handle element 18. When the release lever 28 is pivoted about the axis 80, the element

  handle 12 moves away from handle element 18.

  It will be noted that the locking key or clamp mechanism and the tilting structure described here are essentially conform, with exceptions, to the construction described in US patent N01 489 458. In

  in addition, this construction, its operation and the function

  specific operation of the release lever are clear

  ment described in US patent N 3 192 804. As explained in these known Petersen patents, the closing of a key

  or blocking clamp comprising a rocking device-

  this is done by moving the handle element

  relatively mobile 18, towards the relative handle element

265,077.4

  fixedly 12. This movement forces the upper end

  re of the tilting link 20 to move towards the

  to the handle element 12. The pivot 22 also moves inward and, when this pivot reaches the position of overhang from the center, the clamp is

locked in a closed position.

  Figure 2 shows another embodiment.

  sation of a tool which comprises a fixed arm 15 comprising a fixed handle 12 at one end and a fixed jaw 16 at the other end. A movable jaw 14 is pivotally attached to a movable handle element 18. The jaws 14 and 16 are curved and bulky, as shown in FIG. 2. A tilting link 20

  is pivotally connected to the movable handle. The-

  the free end 47 of the tilting link is in

  taken with a contact part of a screw 24. The poi-

  fixed pin is preferably U-shaped. The end of the fixed handle 30, opposite the fixed jaw 16, is completed by a receiving part 32 comprising a front region 34 and a rear region 36. A tapped hole 38 passes through the receiving part, from region 34 to region 36. A screw 34 can be screwed into the tapped hole. The screw ends with a knurled adjustment button

  at one end and by the contact part 42 at the other

be end.

  When the user turns the screw button 24, its rotation in the tapped hole generates an advance of the screw in the axial direction. This advance in the direction of the fixed jaw 16 presses the part

  contact 42 against the tilting link 20 and modi

  fie the distance between the end 47 of the rod and the pivot point 17 of the movable jaw 14, so that the distance between the fixed jaw 16 and the movable jaw 14 is adjusted to grasp objects of

  different dimensions without exerting excessive force.

  The screw 24 and the tapped hole 38 are illustrated

  in detail in Figure 3. In accordance with this in-

  vention, a combined threaded part 44 of the screw

  takes two individual, separate and coaxial threads 46 and 48 extending along a longitudinal axis A-A. All-

  However, a screw with any reasonable number

  as individual threads fall within the scope of the

  vention. The steps Pl, P2 of threads 46 and 48 indicated

  in FIGS. 3 to 5 are identical, so that the dis-

  tance between corresponding points on adja-

  centes of thread 46 is equal to the distance between

  corresponding points on adjacent turns of the file-

floor 48.

  Figure 5 clearly shows that the diameters

  very top and bottom of the thread of the two threads

are much the same.

  In order to obtain an adequate screwing between the screw 24 and the tapped hole 38, the latter has a combined internal thread comprising two individual, distinct and coaxial threads 50 and 52 which can be screwed

  with threads 46 and 48 of the screw. Internal threads

  individual laughers 50 and 52 extend over the entire length

  hole hole 38, from front region 34 to rear region

36 of the receiving part 32.

  In the preferred embodiment of the invention,

  vention, illustrated in Figure 4, two different starting points 54 and 56, mutually separated by a specific angle, are provided for the individual threads of the screw. This also applies to the tapped hole. Although this angle between the two starting points can be of any reasonable value, FIG. 4 which is an end view of the screw in the preferred embodiment

illustrates an angle equal to 180.

  If the screw has three individual threads, the angle between the adjacent starting points can be. To avoid incorrect priming when

  turns the screw in the tapped hole, another mode of

  Lization (not shown) comprising a single initial turn or boot is provided by the invention. In this case, a screw thread comes in initial cooperation with the corresponding thread of the tapped hole, at the beginning

  of the initial rotation or initiation of the screwing. So

  similar lesson, the second thread of the screw comes in initial cooperation with the corresponding thread of the

  tapped hole, at the start of the initial rotation or initiation

  ge. Therefore, in this other embodiment,

  only one starting point is provided for the two threads.

  The threads according to the invention can be

  to a metric pitch or to American thread standards.

  When using a single thread screw

  between the screw and the tapped hole, as in the prior art

  the distance by which the screw advances axially at

  that turn of the button is equal to the pitch of the single thread.

  On the other hand, if the multiple thread according to the invention is used, the axial advance of the screw at each turn of the

  button is equal to the combined pitch of all internal threads

  dividends used. The screw 24 has two internal threads

  dividends 46 and 48 having corresponding steps Pl and P2. When the user turns the knob 40 a full turn, the advance of the screw in the axial direction

  is equal to the sum of the steps Pl and P2. This double advantage

  ce of the screw acting on the tilting link aug-

  noticeably lying jaw adjustment speed

  movable relative to the fixed jaw. Figure 6 re-

  presents the branches of a C clamp with bottom locking

  bearing, in which a fixed clamp element 61 cooperates with a movable clamp element 62 which pivots

around an axis 63.

  Figure 7 shows a locking chain pliers, Figure 8 shows a locking welding pliers and Figure 9 shows a sheet metal tool

  usual. All of these tools are well known in the art.

  that and are incorporated here for reference.

  The devices described above to increase

  ter the speed of adjustment of the moving jaws or of

  similar moving ties can be applied to tools

  shown in Figures 6 to 9.

  The adjusting screw device described above

  also applies to Stilson keys, clamps

bench and other types of tools.

  As is clear from the above, the information

  vention is in no way limited to those of its embodiments and of application which have just been described in a more explicit manner; on the contrary, she embraces

  all the variations that can come to mind from tech-

  nician in the matter without departing from the framework or the

tee of the present invention.

Claims (14)

  1.- Hand tool (10) comprising a fixed jaw (16) and a movable jaw (14), a fixed handle (12) comprising a receiving part (32), a screw   (24) which cooperates with the receiving party, and   jaw adjustment yen (20) for internal cooperation between the jaws and position adjustment of said movable jaw relative to said fixed jaw; characterized in that   the screw (24) comprises a plurality of first-   individual and distinct threads (46,48) extending along its longitudinal axis (A-A); said receptacle part (32) is defined by a tapped hole (38) provided in the fixed handle (12), said tapped hole comprising a plurality of second individual and separate threads (50,52) which can be screwed with said plurality of first screw threads; so that the greatest speed of advance of the screw in the axial direction, resulting from the screwing by rotation of the plurality of said first threads of the screw and the plurality of said second threads of the tapped hole and acting on said adjusting means   jaws (20), significantly increases the speed of   sliding of the movable jaw relative to the fixed jaw. 2. A hand tool according to claim 1, characterized in that said plurality of said first and second individual and separate threads of said screw   and of said tapped hole comprises two first and two second my threads.   - 3.- hand tool according to claim 2,   characterized in that the first two and the two two   xth threads have identical pitches (P1, P2).   4.- hand tool according to claim 2, characterized in that said threads are threads American standards.   5. Hand tool according to claim 2,   characterized in that said threads are threads- standard metric tages.   6. Hand tool according to claim 3, characterized in that a rotation of one turn of said screw in said tapped hole generates an advance of the screw,   in the axial direction, substantially equal to the pitch of said threads.   7.- Hand tool according to claim 2, characterized in that the starting points (54,56) of said threads on the screw and the tapped hole are offset by a   certain angle to each other.   8. Hand tool according to claim 7,   characterized in that said angle is 180.   9. Hand tool according to claim 7,   characterized in that said starting points are so-   killed in the same plane which is substantially perpendicular to   - area at the longitudinal axis of the screw.   10.- Hand tool according to claim 3,   characterized in that said threads are in the standard pitch American sting 14.   11. Hand tool according to claim 2,   characterized in that each thread is a standard thread American dart 5 / 16-18 UNC-2A.   12.- Hand tool according to claim 1,   characterized in that said plurality of second lines-   individual and separate floors spanning the entire length from the tapped hole.   13.- Locking hand tool, comprising a fixed handle (12) comprising a front part and a rear part, a fixed jaw (16) connected to said front part, and a receiving part (32) located at said part back; a movable jaw (14) pivotally connected to said front part of the fixed handle for cooperation with the fixed jaw, a movable handle (18) connected to the movable jaw; tilting means defined by at least one tilting link (20) having first and second ends, said first end of the tilting link being pivotally connected to said movable handle;   means for adjusting the position of the movable jaw   the relative to said fixed jaw, said adjustment means comprising a threaded hole (38) provided in said receiving portion of said fixed handle and a screw (24) one end of which (42) comes into contact with said second end ( 47) of the tilting link;   characterized in that said screw (24) includes a plurality of   a unit of first individual and separate threads (46,48) extending along its longitudinal axis; said hole   threaded (38) having a plurality of second threads   individual and separate letters (50,52) which can be seen   ser with said plurality of first screw threads; so that the faster feed speed of the screw   in the axial direction, resulting from screwing by rota-   tion of the plurality of said first screw threads   and the plurality of second threads of the ta- hole   raudé and acting on said movable jaw by means of   median of said tilting link and tilting means, significantly increases the speed of adjustment of   said jaw movable relative to said fixed jaw.   14.- Tool adjustment screw, with metal body   that elongated (24), characterized in that it comprises a plurality of individual, distinct and coaxial threads   extending along a longitudinal axis of the body.