IL32989A - A wrench - Google Patents

Description

A R C H The present invention oonoerns wrenches for tightening and loosening pipe threads or the The known wrenches which are adjustable for use with various sizes of bolts or nuts comprise two parallel jaws which are applied against two diametrically opposed faees of a bolt or nut and are tightened thereon through the intermediary of a screw thread or worm One of the jaws is generally part of the handle of the wrench and by turning said handle the nut or bolt is tightened or loosened by being held between the as the case may These known wrenches are apt to wear off the plating and the corners of the nuts or bolts and are therefore not generally allowed to be used in the aircraft or military There are other wrenches which are adapted for use with one size of nut or bolt These wrenches are either o one piece or are provided with exchangeable rings each of which is of one particular Thus a workshop must carry a great number of wrenches in order to satisfy the ments for bolts of both metric and inch It is the object of the present invention to provide a wrench for bolts and which does not damage the part being turned and which is adjustable to any size The invention consists in a wrench for bolts and pipes comprising a shallow housing having a throughgoxng circular axial an annulus adapted to rotate within the housing around the axis of said at least two pins being fixed to said annulua spaced at equal angular distances and ting pivots for a corresponding number of substantially flat jaw members whose jaw faces extend into the range of said each jaw member being provided with a slot through which a guide pin fixed to said housing the turning of the annulus relative the housing causing a guided movement of said jaw members whereby the jaw faces approach or move away from said a handle provided on said the latter being adapted to turn in the required direction when a nut or pipe is held by said jaws and is to be tightened or means being provided to turn the annulus relative the The invention is by way of example in the accompanying drawings in 1 is a plan partly broken of a wrench according to the invention 2 is a section thereof on line of ϊ 3 is a partial plan view of one half of the the internal face being seen 4 is a section thereof taken on line of 5 is a plan view of the retaining ring 6 is a section thereof taken on line of 5 7 is a perspective view of a jaw member according to the The wrench here illustrated comprises a housing constituted by two identical circular disks 1 merging into handle halves 2 which are attached to each other by means of a screw 3 to form the solid handle of the Each disk 1 has an annular internal groove la near its periphery and an axial opening 1 b surrounded by an annular rim lc of a shorter height than the thickness of disk Three bores 1 d are provided in rim at equal angular pin fixedly mounted the annular rims lb of disks 1 and fastened therein by means of screws extends into the slot and guides the movement of members 9 as will become clear The disks 1 are provided with arcuate slots le near handles Pins extending through slots le and annulus 8 and held by permit the rotation in either direction of said annulus within the limits of slot the heads 7 of pins 6 and said screws being knurled for more convenient in heads 7 and thus pins 6 and with it rim 8 is turned in the direction of the arrow from the position pins 12 will pull jav members 9 likewise in the same the latter will be forced by the slots 9b moving along the guide pins 10 to make a movement the axis of opening lb at the same A movement of heads in opposite direction will jaws 9a to move from said axis until they abut the inner walls of rims of disks A coil spring 5 lodged in a space 2a provided in handles 2 is with one end to a pin 4 mounted in said handles and with the other to annulus 8 and is biassed in such a manner that it urges ring 8 in the direction of the in the direction to make jaws 9a approach the When now wrench above described is placed on a bolt to be indibated in lines in the spreading of jaws 9a is effected by means of pins 6 against the action of spring 5 as has been and the spring is then permitted to apply the jaws onto the three alternate faces of the Handles 2 are now turned theplates 9 and jaws 9a holding the bolt tightly and permitting its turning owing to the forces acting on jaws 9a and pin A wise motion of the will cause the faces of the bolt to retract the jaws against the action of spring will again apply the jaws to the when it is to be tightened Thus the S operate in a manner during the use of the When the bolt is to be the wrench is turned and placed onto the so that a motion of the handles will hold it tightly to loosen In the process of unscrewing and screwing of nuts and the faces of the heads are not damaged since the jaws 9a are applied to said faees in a movement parallel insufficientOCRQuality

Claims (6)

The design of the wrench according to the invention may be Other than that above described without deviating from the scope thereof. Thus it is possible to provide two, or more than throe, jaw members, the corresponding number of pivot pins 12 or guide pins 10 being provided* Instead of coil spring j|a leaf spring raay be lodged in a suitable space provided in the handle. The ring 8 may be a flat, solid annulus, in which ease the jaw members 9 would be pivotally fixed to one surface thereof* The slot le and pin 6 may be provided on the peripherial edge of the housing or at any other suitable position* The housing of the wrench may be constituted by two parts which are not identical, e.g# a part similar to the one illustrated and a flat part attached thereto in any suitable manner* The handle may be integral or fixed thereto as a separate part. The wrench acoording to the invention may also be used as a clamping tool for pipes. In this case, the faces of jaws 9a are preferably knurled. If it is desired to eliminate spring 5, the wrench can be operated as well, moving the jaw members against the nut or bolt by means of heads 7* C LA I M S t

1. » A wrench for nuts, bolts and pipes comprising a shallow housing having a throughgoing circular axial opening, an annulus adapted to rotate within the housing around the axis of said opening, at least two pins being fixed to said annulus spaced at equal angular distances and constituting pivots for a corresponding number of substantially flat jaw members whose jaw faces extend into the range of said openings, eaoh jaw member being provided with a slot through which a guide pin fixed to said housing extends* the turning of the annulus relative the housing causing a guided movement of said jaw members whereby the jaw faces approach or move away from said axis, a handle provided on said housing being adapted to turn the latter in the required direction when a bolt, nut or pipe is held by said aws and is to be tightened or loosened, means being provided to tur the annulus relative the housing*

2. * A wrench as claimed in Claim 1, wherein three pivot pins are provided in the annulus at equal angular distances a jaw member being pivotally mounted on eaoh of said pins*

3. * A wrench as claimed in Claim 1 or 2, wherein an internal annular groove is provided in the housing for guiding the rotating movement of said annulus*

4. * A wrench as claimed in any preceding claim, wherein the annulus is of U-shaped cross-section, its open space facing the said axis, the said pivot being mounted in the legs of the MUn, the jaw members extending partially between said legs*

5. A wrench as claimed in any preceding claim, wherein a spring is provided fixed between the housing and said annulus and is adapted to move the latter into the position in which the jaw faces approach said axis*

6. A wrench as claimed in any preceding claim, wherein said means comprise an arcuate slot in the housing, a pin fixed to said annulus extending through said slot and being provided at its outside vith a head for easy operation* 7· Wrenches substantially as hereinbefore described and illustrated in the accompanying drawing. AGENT FOB APPLICANT Tel-Aviv, this 10th Day of September 1969