US2407990A

US2407990A - Pipe wrench

Info

Publication number: US2407990A
Application number: US487265A
Authority: US
Inventors: Benjamin L Lurie
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-05-17
Filing date: 1943-05-17
Publication date: 1946-09-24
Anticipated expiration: 1963-09-24

Description

B. L. LURE PIPE WRENCH Sept. 24, 1946.

Filed May 17, 1945 3 sheets-sheet 1' Sept. 24, 1946. B. L. LURIE 2,407,990

vPIPE WRENCH Filed May 17, 1943 3 lSheets-Sheet 2 Bl L. LURIE PIPE WRENCH Sept 24, 1946.

Filed May 17, 1943 5 Sheets-Sheet 5 Patented Sept. 24, 1946 UNITED STATES PATENT OFFICE PIPE WRENCH Benjamin L. Lurie, Chicago, Ill.

Application May 17, 1943, Serial No. 487,265

4 Claims.

The present invention relates generally to Wrenches. More particularly the invention relates to that type of wrench which is primarily designed for use in turning a pipe r like article and comprises an elongated handle having at one end thereof a pair of opposed jaw carrying arms, one of which is fixedly connected to the adjacent end of the handle and the other of which is movable to and from the xed arm in order to adapt the wrench for use in connection with pipes that vary in diameter.

One object of the invention is to provide a wrench which is an improvement upon, and has certain advantages over, previously designed pipe Wrenches and is characterized by durability and high eiciency.

Another object of the invention is to provide a pipe wrench of the type under consideration which is so designed and constructed that during use thereof it will not deform the pipe to which it is applied in the same manner as a straight jaw variety pipe wrench, such, for example, as a Stillson wrench.

Another object of the invention is to provide a pipe wrench of the aforementioned type in which the jaws are so arranged and designed that they will eiectively grip aV galvanized or greasy pipe regardless of whether the teeth thereof are slightly worn.

' Another object of the invention is to provide a pipe wrench of the last mentioned character in which the jaws are of novel design and are so 4 mounted on their respective arms that in connection with use of the wrench a maximum number of their teeth grip the pipe to which the wrench is applied.

A further object of the invention is to provide a pipe wrench of the type and character under consideration which includes novel means for adjusting the movable jaw carrying arm to and from the fixed arm and also novel means for automatically controlling the movable arm so that the jaw thereof moves towards the jaw on the xed arm into firm gripping relation with the pipe directly upon initia1 swinging of the handle in connection With a pipe turning operation.

A still further object of the invention is to provide a pipe wrench which is generally of new and improved construction, may be manufactured or produced at a comparatively low cost, and not only is useable to turn pipes which are in inaccessible or restricted places, such, for eX- ample, as overhead pipes o r pipes in corners or against walls or oors, but also is quickly released in connection with the initial part of reverse swinging of the handle.

Other objects of the invention and the various advantages and characteristics of the present pipe wrench will be apparent from a consideration of the following detailed description.

The invention consists in the several novel features which are hereinafter set forth and are more particularly defined by claims at the conclu'sion hereof.

In the drawings which accompany and form a part or" this specification or disclosure and in which like numerals of reference denote corren sponding parts throughout the several views:

Figure 1 is aside View showing a pipe wrench embodyingthe invention directly before the jaws thereof are pushed or shifted into gripping relation with a pipe;

Figure 2 is an inverted plan or bottom view of the wrench;

Figure 3 is a fragmentary side view showing the Iwrench after the jaws thereof have been fully shifted into engagement with the pipe preliminary to swinging of the handle in connection with a pipe turning operation, the jaws and the adjacent ends of the arms being shown in section for illustrative purposes;

Figure 4 is a fragmentary longitudinal section showing the wrench after the handle has been initially swung in connection with a pipe turning operation and illustrating the manner in which the automatic control means serves to swing the jaws on the movable arm towards the jaw on the Xed arm into gripping relation with the pipe;

Figure 5 is another fragmentary longitudinal section showing the jaws in full gripping relation with the pipe due to further swinging of the handle;

Figure 6 is a transverse section taken on the line B- of Figure l and illustrating in detail the construction and design of the adjusting screw constituting the means for moving the movable arm to and from the xed arm in order to adapt the wrench for use in connection with pipes that vary in diameter;

Figure l is an enlarged tranverse section taken on the line 7 1 of Figure l and showing the construction and design of the jaw on the movable arm and the manner in which it is rotatably supported;

Figure 8 is an enlarged transverse section taken on the line 8 8 of Figure 1 and illustrating in detail the manner in which the jaw on the xed arm is mounted; and

Figure 9 is a perspective of the jaw which is 3 associated with, and mounted to rotate relatively to, the movable arm.

The wrench which is shown in the drawings constitutes the preferred form or embodiment of the invention. It is primarily designed or adapted for use in turning a pipe p and comprises as its main cr principal parts an elongated handle IB, a pair of arms il and I2 and a pair of jaws I3 and I4.

One end of the handle is adapted to be gripped by the user in connection with use of the wrench. rIhe other end of the handle is provided with an enlarged housing I5. The latter consists of a bottom wall I5, an inner end wall I l, an outer end wall i3, a side wall I9, and a removable plate 2t). The walls I6, I'I, I8 and I9 are formed integrally with said other end of the handle I@ and together define or form a pocket 2I having one side thereof open. The plate 23 is shaped correspondingly to the side wall IS andA serves as a n closure for the open side of the pocket. Screws 22 extend through holes 23 in the inner and outer end walls Il and I8 and into registering threaded holes 24 in the plate 23 and serve releasably or removably to secure the plate 2i) in its operative or normal position. Removal `of the screws 22 releases the plate 2B so` that it may be withdrawn in order to provide access to the pocket 2 I. The` inner end wall II of the housing I5 extends upwards to 'the upper central portion of the side wall le, as shown in Figures 4 and 5. The upper end of the outer end wall I8 terminates beneath the upper end of the inner end wall and dernes with said upper end of the inner end wall and the adjacent marginal portions of the side Wall I 9 and the plate 2S, an opening 25 leading into the outer upper portion of the pocket 2I.

The arm Ii is disposed outwards of the housing I5 and is in substantially longitudinal alignment with the handle I0. It embodies a vertical socket 2t in its central portion and has a substantially flat upper surface. The inner end of the arm Ii is formed integrally with the outer end wall i8 of the housing I5 with the result that the arm II is in fixed or rigid Yrelation with the handle it. The socket 23 extends completely through the central portion of the arm Il, as shown in Figures 4 and 5. The outer end of the arm I I is of reduced width or thick-ness, as shown in Figure 2.

The arm I2 overlies the arm I I. It is movable to and from the latter as hereinafter described. The inner end of the arm I2 extends into the pocket 2| through the opening 25. The central portion of the arm I2 is provided with a substantially vertical socket 2'I and this extends cornpletely through the arm and is substantially vertioalli7 aligned with the socket 26 in the central portion of the arm II. A screw 28 serves as a medium for adjusting the movable arm I2 to andfrom the arm II. This screw extends substantially vertically and has the lower end thereof disposed in the socket 26 and `its upper end disposed in the socket 2l. rIhe lower end of the screw has a right hand screw thread 2B and extends through a threaded hole 30 in the central portion of a transversely extending pivot pin 3l. The ends of the pivot pin `are journalled in a pair of coaxial or aligned holes 32 in the sides of the socket defining central portion of the arm i l. rIhe pivot pin 3| permits the screw toswing baci: and forth between the outer 'nd of the arm II and the outer end wall I8 of the housing i5. The upper end of the screw 28 is provided with a left hand screw thread 33 and extends rection the arm l2 is moved towards the fixed arm VII and when the screw is reversely turned or rotated the arm I2 is moved away from the xed'arm. By turning the screw 28 the arms II and l2 may be adjusted to receive pipes of different diameters. The pivot pin permits the arm I2 to rock or swing relatively to the adjust- Y ing screw 28.

or no The jaw I3 is associated with, and carried by, the fixed arm Ii. It is located at the outer end of such arm and has a V concave upper face and a flat bottom face. The concave upper faceis provided from the front end thereof to the rear end with transversely extending pipe engaging teeth 38. The rear end of the jaw I3 is higher than the front end with the result that the arcuate series of teeth 38 slopes outwards and downwards. The bottom portion of the jaw I3 is provided with a pair of laterally spaced, depending, integral lugs 39 and these straddle the outer end of the fixed arm I I as best shown in Figure 8. A pin 4i! extends through', and is fixed within, a transverse hole 4I in the 'outer extremity of the arm I l. The ends of this pin projectbeyond the sides of the outer end of the arm II and vfit within holes 42 in the front ends 'of the depending lugs 3i). The ends of the pin 4i] and the hole defining portions of the lugs form a pivotal connection whereby the inner or rear end of the jaw i3 may be swung upwards and downwards -to a limited extent relatively to the 4arm, II. When the jaw i3- is in its normal pipe gripping position the fiat bottom face thereof rests flatly against the flat upper surface of the outer end of the arm il, as shown in Figures 3, 4 and 5. The holes a2 are of slightly greater vdiameter' than -the pin 4e in order that the jaw I3 is free to slide outwards and inwards to a limited extent relatively to the outer end of the arm II and thus properly seat itself with respect to the pipe during a pipe gripping operation. A compression spring 43 serves to urge the jaw I3 upwards and outwards away from the outer end of the arm II. This spring is disposed in a socket 44 which e-xtends downwards from the upper surface of the arm EI and is located midway Ibetween the pin 49 and the socket 23. The upper end of the spring engages the rear portion of the at bottom face of the jaw I3. When the wrench is not in use the spring 43 holds the jaw I3 in its upwardly tilted position. lVhen the jaw I3 is shifted into engagement with the pipe as hereinafter de-v scribed, the jaw I3 swings downwards against the force of the spring 43 until the flat `bottom face thereof is in seated relation with the fiat upper surface of the outer end of the arm II.

The jaw I4 is associated with, and carried by, the movable armIZ. It underlies the outer end of the movable arm and is disposed slightly outwards or forwards of the jaw I3. As shown in Figure 9, the jaw I4 is substantially semi-cylindrical and has a reentrant V-shaped bottom por-` tion, the inner half of which has a substantially straight series of Vdownwardly 'extending transverse teeth 45 and the outer half of which has a substantially straight series of downwardly extending transverse teeth 46. The curved or arcuate peripheral portion of the jaw I4 nts within a semi-circular recess 41 in the lower portion of. therouter end of the movable arm I2. This recess extends longitudinally of the arm I2. It has the same radius as the arcuate peripheral portionlof the jaw I4 and permits the jaw to turn o'rrotate back and forth about the axis or center thereof. 'Ihe sides of the jaw I4 are provided with arcuate grooves. 48 and these are in concentric relation With the arcuate peripheral portionof the jaw I4. A pairof screws 49 serves tozhold the jaw I4 in connected rel-ation with the outerlendof the arm I2 while at the same time permitting the jaw to rock or .rotate about its axis. These screws 49 extend through a pair of coaxial or longitudinally aligned threaded holes 5!)4 in the side portions ofthe outer end of the arm IZ and lare arranged so that the inner ends .thereof fit Within the arcuate grooves 48 (see Figure '7) A screw 5 I extends through a threaded hole 52 in the .upper portion of the outer end of the movable arm I2 and serves to limit rotation or rocking of the jaw I4. The inner end of the last mentioned screw extends into the upper cr central portion of the semi-cylindrical recess 4l and projects into an arcuate groove 53 in the arcuate `peripheral portion of said jaw I4, as shown in Figures 3, 4 and 7. The portion of the jaw I4 that defines the inner end of the arcuate groove. 53 forms a stop shoulder 54. The latter coacts with the inner end of the screw 5I to limit clockwise rotation of the jaw I4 as viewed in Figures l, 3, 4 and 5. Preparatory to applying the wrench to the pipe p the jaw I4 is rotated to a small extent in a counterclockwise direction as viewed in the aforementioned figures. In connection with a pipe turning operation the teeth 45 are brought into engagementwith the pipe as shown in Figure 1. As the wrench is further shifted toward the pipe .the jaw I4 turns in a clockwise direction and causes the teeth 46 to be brought into engagement or gripping relation with the pipe, as shown in Figure 3.

In addition to the parts heretofore described the wrench comprises means `for automatically swinging the outer or front end of the movable arm `I2 forwards and downwards into rm gripping relation withithe pipe p directly upon initial swinging ofthe handle I0 in connection with a pipe turning operation. Such means comprises a `toggle link 55 in the pocket 2|. This toggle link extends between the inner end of the movable arm I2 and the inner lower portion of the outer end wall I8 of the housing I5. It is arranged so that it extends upwards and inwards at an angle of approximately 60 with respect to the horizontal when the wrench is so positioned that `the handle I0 extends horizontally. The upper end of the toggle link 55 is provided with an enlarged cylindrical head 55 which fits within a three-quarter round socket 51 in the lower portion of the inner end of the movable arm I2. The lower end of the toggle link embodies a forwardly extending convexly curved lug 58 which fits against a concavely curved surface 59 cn the inner lower portion of vthe outer end wall I8 and permits the toggle link to rock outwards and inwards relatively to the opening for the pocket 2 I. When the jaw I4 is in gripping relation with the pipe p and the handle Ill is initially swung downwards in connection wi-th a pipe .turning operation the upper end of the toggle link 55 swings forwards to a small or limited extent and causes the arm I2 toswing forwards about the axis of the pivot pin 3I and also causes the arm' to swing in a clockwise manner as viewed in the drawings about the axis of the pivot pin 35.

Such swinging on the part of the movable arm results in the jaw I4 being urged in the direction of the jaw I3 and into firm gripping relation with .the pipe p. The amount of rocking or swinging of the movable arm by the toggle link 55 increases as the amount of downward force on the handle'IIl increases. A pin and slot connection B0 serves to hold the lug 58 in seated relation with the curved surface 59 while at the same time permitting the toggle link 55 to swing outwards and inwards. This connection comprises a laterally extending pin 6I on the inner end of the .toggle link 55 and an arcuate groove 62 in the inner face of the side wall I9 of the housing I5. The outer er1-d of the pin 5I projects into the groove 62, as shown in Figures 4 and 5. Such groove is disposed adjacent the concavely curved surface 59. A tension spring 53 serves to swing inwards the toggle link 55 and effect retraction of the movable arm I2 immediately after the jaw I4 is released from the pipe after a pipe turning operation. This spring is disposed in the inner portion of the pocket 2| and has one end thereof anchored to a pin 64 on the central portion of the toggle link 55 and its other end anchored toa pin 65 on the central portion of the bottom wall I6 of the housing I5. A pair of coacting flat surfaces IiI and 61 serve to limit retraction or inward swinging of the toggle link 55 by the spring 63.

The surface EG is formed on the lower end of the toggle link 55 directly beneath the convexly curved lug 58. The surface 51 is formed on the inner lower portion of the outer end Wall I8 directly beneath the concavely curved surface 5i). When the toggle link 55 rocks forward in connection with a pipe turning operation the .surface 66 swings away from the surface 61, as shown in Figures 4 and 5. When the toggle link 55 is retracted after a pipe turning operation as the result of the action of the tension spring 53 the flat surface B6 swings into contact or engagement with the surface E'I and thus serves to limit'retraction of the toggle link by the spring.

When it is desired to use the wrench the user rst adjusts the movable arm I2 so as to space apart the jaws I3 and I4 to the proper extent to receive the pipe. The adjustment is effected by turning the screw 28 in one direction or the other depending upon whether it is desired to move the arm I2 to or from the fixed arm Il. After the arm I2 is properly adjusted so that the jaws are set or positioned to receive the pipe, the handle Ill is grasped and the wrench is shifted bodily towards the pipe. During the initial part of shift of the wrench towards the pipe the teeth 45 on the jaw I4 and the outer teeth on the jaw I3 are brought into engagement or Contact with the pipe, as shown in Figure l. During further shift of the wrench towards the pipe the jaw I4 rotates in a clockwise directionY as viewed in the drawings with the result that the teeth 45 are brought into engagement with the pipe and the pipe is forced inwards'into complete seated relation with the teeth 38 on the upper portion of the jaw I3. Clockwise rotation of the jaw I4 also causes the pipe to depress the jaw I3 against the force of the compression spring 43. The pressure which is exerted by this spring causes both jaws to grip the pipe before the handle IB is swung for pipe Aturning purposes (see Figure 2).

After the wrench is shifted towards the pipe` as faras possible the handle I 0 is swung downwards.

' 7 'During the initial part of downward swing of ,the handle the jaw Iii rotates in a clockwise manner until it is stopped as the result of abutment Vof the inner end of the screw I against the stop shoulder 54 at the inner end of the arcuate groove 53. During clockwise rotation of the jaw I4 in connection with initial downward swinging of the handle li! the teeth 4ta continue to force the pipe downwards against the teeth 38 and the jaw I3 is depressed or swung downwards until the loot-v torn face thereof is in seated relation with the upper flat surface of the arm Il. As soo'n as the jaw I3 is depressed to its fullest extent in connection with initial downward swingingof the handle the two jaws are in fixed or rigid relation with their respective arms. During further downward swinging of the handle l0 the arm I2 moves outwards relatively to the handle and fixed arm in an arc about the axis of the pivot pin 3l. As the arm i2 moves outwards the toggle link 55 swings outwards in the direction of the pipe and causes the arm l2 to swing or rock in a clockwise manner about the center or axis of the pivot pin 35. Such swinging or rocking of the arm forces the jaw I4 towards the jaw I3 and causes the teeth on the two jaws to bite into the pipe, as shown in Figure Ll. As soon as theteeth of the two jaws are caused to bite into the pipe further downward swinging of the handle results in turning of the pipe. By reason of the fact that a maximum` number 0f teeth are in gripping relationY with the pipe the load or gripping force on l the pipe is evenly distributed and there is no likelihood of the pipe being crushed in connection with turning thereof by the wrench. Reverse or upward swinging of the handle reverses the action of the various parts andelements and releases the jaws from the pipe. As soon as the jaws are released from the pipe in connection with upward swinging of the handle Il] the tension spring E3 swings the toggle link 55 and the arm I2 inwards until they are stopped as a result of abutment of the iiat surface t6 against the surface 61. If it is desired to turn the pipe in a clockwise direction as viewed in the drawings the wrench is reversed, i. e., turned upside down.

The herein described wrench is extremely efficient so far as operation is concerned and involves a rugged construction which tends towards durability. It may be produced at a reasonably low cost and is useable in connection with pipes in inaccessible places, such, for example, as overhead pipes or pipes in corners or against walls or floors.

Whereas the wrench has been described as a medium for turning a pipe it is to be understood that it may be used to turn any other article. It is also to be understood that the invention is not to be restricted to the details set forth since these may be modied within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus described the invention what I claim as new and desire to secure by Letters Patent is:

l. A pipe wrench comprising a handle, an arm having one end thereof connected fxedly to one end ofthe handle, a laterally disposed jaw piv-y otally mounted on the outer end of the arm to swing to and from said arm and having on the outer portion thereof a concave pipe engaging face with transverse teeth thereacross, spring means for urging said jaw away from the arm, a second arm disposed in opposed relation with the first mentioned arm and having its outer end projecting a short distance beyond the outer end of said first mentioned jaw and provided with a longitudinal arcuate recess facing the jaw, 'a substantially semi-circular jaw seated and rotatably mounted in the recess and having exteriorly of said recess a reentrant V-shaped pipe engaging face with transverse teeth thereacross, an adjusting screw adapted to move the second arm to and from the first Vmentioned arm and having the ends thereof pivotally connected to the central portions o'f said' arms, respectively, and means op-` erative automatically in response to swinging of the handle in a direction away from the second arm after application of the jaws to the pipe to move the second arm outwards away from the handle and also to swing or tilt said second arm in such directionas to' cause the jaw thereon to move towards the jaw on the first mentioned 'armi and embodying an angularly disposed toggle link having one end thereof pivotally connected to the inner end of said second arm and its other end in pivotal relation with said one end of the handle, and so arranged or inclined that said one end thereof extends away from the adjusting screw and its said other end extends towards the adjusting screw.

2. A pipe wrench comprising a handle, an arm having one end thereof connected fixedly to one end of the handle Yand embodying at its outer end a laterally extending pipe engaging jaw, a.' second arm disposed in opposed relation with the -rst mentioned arm and having its outer end provided with a laterally extending pipe engaging jaw, an adjusting screw adapted to move the second arm to and from the rst mentioned arm and having the ends thereof pivotally connected to the cen# tral portions of said arms, respectively, means operative automatically in response to swinging of the handle in one direction after application of the jaws to the pipe to move the second arm outwards away from the handle and also to swing or tilt said second arm in such direction as to cause the jaw thereon to move towards the jaw on the rst mentioned arm, and embodying an angular- 1y disposed toggle link having one end thereof pivotally connected to the inner end of said second arm and its other end in pivotal relation with said one end of the handle, and so arranged or inclined that said one en'd thereof extends away from the adjusting screw and its said other end extends towards the adjusting screw, and a spring extending between, and connected to, theI toggle link and said one end of the handle, and arranged to move and swing said second arm reversely when'the handle is swung into theopposite' direction after a pipe turning operation.

3. A pipe wrench comprising a handle, an arm having one end thereof connected xedly to one end of the handle and embodying at its out/er end a laterally extending pipe engaging jaw, a second arm disposed in opposed relation with' th first mentioned arm and having its outer end project-V inga short distance beyond the outer end of said first mentioned arm and provided with alaterally extending pipe engaging jaw, an `adjusting screw adapted to move the second arm to and from the rst mentioned arm and having the ends thereof pivotally connected to the central portions of said arms, respectively, means operative automatically in response to swinging' of the handle in one direction after application of the jaws to the pipe to move the second arm outwards away from the handle and also to swing or tilt said second arm in such direction as to cause thev jaw thereon to move towards'tln jaw on the first mentioned arm, and embodying an angularly disposed toggle link having one end thereof pivotally connected to the inner end of said second arm and its other end in pivotal relation with said one end of the handle, and so arranged or inclined that said one end thereof extends away from the adjusting screw and its said other end extends toward the adjusting screw, a spring applied to the toggle link and operative to move and swing said second arm reversely when the handle is swung in the opposite direction after a pipe turning operation, and means consisting of a pair of coacting substantially flat surfaces on said other end of the toggle link and the adjacent portion of said one end of the handle for limiting reverse movement and swing of said second arm by the spring.

4. A pipe Wrench comprising a handle, an arm having one end thereof connected xedly to one end of the handle and embodying at its outer end a laterally extending pipe engaging jaw, a second arm disposed in opposed relation with the rst mentioned arm and having its outer end provided with a longitudinal arcuate recess facing the jaw, a substantially semi-circular jaw seated and rotatably mounted in the recess andl having exteriorly of said recess a reentrant substantially V-shaped pipe engaging face, an adjusting screw device adapted to move the second arm to and from the rst mentioned arm and having the endsv thereof pivotally connected to the central portions of said arms, respectively, and means operative automatically in response to swinging of the handle in a direction away from the second arm after application of the jaws to the pipe to move the second arm outwards away from the handle and also to swing or tilt said second arm in such direction as to cause the jaw thereon to move towards the jaw on the rst mentioned arm, and embodying an angularly disposed toggle link having one end thereof pivotally connected to the inner end of said second arm and its other end in pivotal relation with said one end of the handle, and so arranged or inclined that said one end thereof extends away, from the adjusting screw and its said `other end extends toward the adjusting screw.

BENJAMIN L. LURIE.