Pipe cutter

Abstract: A pipe cutter includes a body (10) having two side walls (102) and each of the side walls (102) has an arcuate slot (100). A rod (11) pivotally extends through the first end of the body (10) and a first contacting member (12) is rotatably connected to the second end of the body. A first link (13) has a first end thereof pivotably connected to the body (10) and a second end thereof having a disk blade (14) rotatably connected thereto. The rod (11) is pivotally connected to the first link (13) to which a second link (15) is pivotally connected, the other end of the second link (15) has a second contacting member (16) rotatably connected thereto. The second contacting member (16) has two protrusions (160) extending centrally and longitudinally therefrom so as to move within the two arcuate slots (100).

Description: The present invention relates to a pipe cutter having two rollers and a disk blade wherein one of the rollers and the disk blade are movable and connected together by links so that the pipe to be cut is evenly and firmly clamped by three contacting points as for example known from US 2706-85-3. A conventional pipe cutter generally includes a body made of cast iron, fixed two rollers arranged to an inner side of the body and a movable blade disk movably connected to a threaded rod which can be moved by rotating a knob connected to a distal end of the threaded rod. A pipe to be cut can be clamped by the two fixed rollers and the disk blade which is moved toward the two fixed rollers. By rotating the threaded rod, the disk blade cuts the pipe. However, the speed to move the disk blade is so slow so that it takes a lot of time to cut the pipe. In addition, the conventional pipe cutter can be only used to cut the pipe having the smaller diameter, because the distance between the two rollers is not adjustable so that a pipe having a large diameter will not be well clamped between the two rollers and the disk blade. Furthermore, the threaded rod can only be moved in a fixed direction and this limits the positions where the rollers are located. All of the three pipe cutters are made in a form of a one-piece article which is made of cast iron which is heavy so that the users cannot use them conveniently. The cost for manufacturing the conventional pipe cutters is high and therefore reduces the commercial benefit. The present invention intends to provide an improved pipe cutter wherein one of two rollers is fixed and the other is movable, the disk blade is movable and pivotally connected to the movable roller by two links so that the two rollers and the blade disk clamp the pipe to be cut evenly on the outside of the pipe, and the pipe cutter of the present invention may clamp pipes with different diameters. A further object of the present invention is to provide a pipe cutter with a fixed roller, a movable roller and a movable disk blade so as to clamp a pipe to be cut firmly. As claimed, a pipe cutter is proposed which comprises a body having a first end with a rod movably extending therethrough and a second end having a first contacting member rotatably connected thereto. The pipe cutter further comprises a first link having a first end thereof pivotally connected to said body and a second end thereof having a disk blade rotatably connected thereto, said rod being pivotally connected to said first link, and a second link having a first end thereof pivotally connected to said first link and a second end thereof having a second contacting member rotatably connected thereto. According to the invention, the body comprises two side walls each having an arcuate surface defined thereon and in that the second contacting member comprises two protrusions extending centrally and longitudinally from two ends of the second contacting member and respectively cooperate within the two arcuate surfaces when the second contacting member moves between extreme positions beside and widely separated apart from the first contacting member according to a movement of the disk blade. Further objects, advantages, and features of the present invention will become apparent from the following detailed description with appropriate reference to the accompanying drawings, in which: Fig. 1 is a perspective view of a first embodiment of the pipe cutter in accordance with the present invention; Fig. 2 is an exploded view of the first embodiment of the pipe cutter; Fig. 3 is an illustrative view of the first embodiment of the pipe cutter, wherein the two rollers and the disk blade are moved together; Fig. 4 is an illustrative view of the first embodiment of the pipe cutter, wherein a small pipe is clamped in the pipe cutter; Fig. 5 is an illustrative view of the first embodiment of the pipe cutter, wherein a large pipe is clamped in the pipe cutter; Fig. 6 is a perspective view of an illustrative example of a pipe cutter; Fig. 7 is an exploded view of the illustrative example of the pipe cutter of Fig. 6; Fig. 8 is an illustrative view of the pipe cutter of Fig. 6, wherein the two rollers and the disk blade are moved together; Fig. 9 is an illustrative view of the pipe cutter of Fig. 6, wherein a small pipe is clamped in the pipe cutter; Fig. 10 is an illustrative view of the pipe cutter of Fig. 6, wherein a large pipe is clamped in the pipe cutter; Fig. 11 is a perspective view of a second embodiment of the pipe cutter in accordance with the present invention; Fig. 12 is an exploded view of the second embodiment of the pipe cutter ; Fig. 13 is an illustrative view of the second embodiment of the pipe cutter, wherein the two rollers and the disk blade are moved together; Fig. 14 is an illustrative view of the second embodiment of the pipe cutter, wherein a small pipe is clamped in the pipe cutter; Fig. 15 is an illustrative view of the second embodiment of the pipe cutter, wherein a large pipe is clamped in the pipe cutter; Fig. 16 is an exploded view of a third embodiment of the pipe cutter in accordance with the present invention; Fig. 17 is an illustrative view of the third embodiment of the pipe cutter; Fig. 18 is an end view to show the two side walls connected with each other of the third embodiment of the pipe cutter; Fig. 19 is an exploded view of a fourth embodiment of the pipe cutter in accordance with the present invention, and Fig. 20 is an illustrative view to illustrate the fourth embodiment of the pipe cutter. Referring to Figs. 1 to 4, the pipe cutter in accordance with the present invention comprises a body 10 having an arcuate plate 101 and the two side walls 102 extending from two opposite sides of the arcuate plate 101, each of the two side walls 102 having an arcuate slot 100 defined therethrough. A threaded rod 11 threadedly and movably extends through a tube 111 pivotally received in a first end of the body 10, and a first contacting member 12 is rotatably connected to the second end of the body 10. A knob 110 is connected to one of two ends of the threaded rod 11 and opposite to the first contacting member 12. A first link 13 has a first end thereof pivotably connected to the body 10 and a second end thereof having a disk blade 14 rotatably connected thereto. The other end of the threaded rod 11 is pivotally connected to the first link 13 so that when moving the threaded rod 11, the disk blade 14 is moved toward the first contacting member 12. A second link 15 has a first end thereof pivotally connected to the first link 13 and a second end thereof having a second contacting member 16 rotatably connected thereto which has a pin extending through the second contacting member 16 so that two protrusions 160 extend centrally and longitudinally from two ends of the second contacting member 16 and respectively move within the two arcuate slots 100. The second contacting member 16 is moved according to the movement of the disk blade 14 so that when moving the disk blade 14 to an extreme position where the disk blade 14 contacts the first contacting member 12, the second contacting member 16 is located beside the first contacting member 12. Therefore, when clamping a small pipe 40, the three contacting points on the pipe 40 are located at an equal angular distance. Referring to Fig. 5, when a large pipe 41 is clamped by the pipe cutter, the first contacting member 12 and the second contacting member 16 are separated wide apart so as to firmly hold the pipe 41. Each of the two side walls 102 has an arcuate recess 103 defined in one of two sides thereof so as to receive a pipe 40 to be cut. It is to be noted that each of the first link 13 and the second link 15 includes two plates connected with each other with a gap defined between the two plates so that the total weight of the pipe cutter is reduced. The two plates and the two side walls 102 can be made of plastic material, and are connected together by rivets so as to conveniently assemble the pipe cutter. Figs. 6 to 8 show an illustrative example of a pipe cutter, wherein the pipe cutter comprises a body 20 having an arcuate plate 201 and two side walls 202 extend from two opposite sides of the arcuate plate 201. The body 20 has the first end thereof with a threaded rod 21 movably and pivotally extending therethrough and a second end having a first contacting member 22 rotatably connected thereto: The threaded rod 21 extends through the tube 211 which is pivotally received in the first end of the body 20. A guide roller 200 is connected between the two side walls 202, and a knob 210 is connected to the threaded rod 21. Each of the two side walls 202 has an arcuate recess 203 defined in one of two sides thereof so as to be adapted to receive a pipe to be cut. A first link 23 has a first end thereof pivotably connected to the body 20 and a second end thereof having a disk blade 24 rotatably connected thereto, the threaded rod 21 pivotally connected to the first link 23. A second link 25 has a first end thereof pivotally connected to the first link 23 and a second end thereof having a second contacting member 26 rotatably connected thereto. A spring 250 is biased between the second link 25 and the body 20 and the guide roller 200 rolls on the back of the second link 25 when the second link 25 moves. The second link 25 has a raised portion 251 which contacts the guide roller 200 when the second contacting member 26 is moved beside the first contacting member 22 as shown in Fig. 8. Each of the first link 23 and the second link 25 includes two plates connected with each other with a gap defined between the two plates. Figures 9 and 10 respectively show the pipe cutter clamps a small pipe 42 and a large pipe 43, wherein the second link 25 moves by rolling on the guide roller 200 and the spring 250 pulls the second link 25 to contact the guide roller 200. Figures 11 to 13 show a second embodiment of the pipe cutter of the present invention which comprises a body 30 having an arcuate plate 301 and two side walls 302 extend from two opposite sides of the arcuate plate 301. Each of the two side walls 302 has an arcuate recess 303 and an arcuate notch 300 respectively defined in one of two sides thereof, the arcuate recess 303 communicating with the arcuate notch 300. The body 30 has a first end with a threaded rod 31 pivotally extending therethrough and a second end thereof having a first contacting member 32 rotatably connected thereto. The threaded rod 31 extends through a tube 311 pivotally received in the first end of the body 30 and a knob 310 is connected to one of two ends of the threaded rod 31. A first link 33 has a first end thereof pivotably connected to the body 30 and a second end thereof having a disk blade 34 rotatably connected thereto, the rod 31 is pivotally connected to the first link 33. A second link 35 has a first end thereof pivotally connected to the first link 33 and a second end thereof having a second contacting member 36 rotatably connected thereto. A spring 350 is biased between the second link 35 and the body 30. A pin extends through the second contacting member 36 so as to have two protrusions 360 extending centrally and longitudinally from two ends of the second contacting member 36 such that the two protrusions 360 move along the two arcuate notches 300. Each of the first link 33 and the second link 35 includes two plates connected with each other with a gap defined between the two plates. Referring to Figs. 14 and 15 which respectively show a small pipe 44 and a large pipe 45 clamped by the pipe cutter, the second contacting member 36 is moved according to the sizes of the pipes 44, 45. Referring to Figs. 16 to 18 showing a third embodiment of the pipe cutter of the present invention, wherein the structure of the pipe cutter is the same as that shown in Figs. 11 to 15 except that the third embodiment has no the arcuate plate 301 as shown in Fig. 12. The two side walls 400 of the third embodiment of the pipe cutter are connected together by several rivets 401 so that all the parts such as the two links 402, 403 and the threaded rod 404 are received between the two side walls 400. Figures 19 and 20 show a fourth embodiment of the pipe cutter of the present invention, wherein the pipe cutter of the fourth embodiment is the same as that of the third embodiment except that a connecting plate 501 connects the two side walls 500 of the fourth embodiment and the connecting plate 501 is made of flexible and durable material so that the two side walls 500 can be folded toward to each other corresponding to the connecting plate 501, and the two side walls 500 are further connected by rivets 502. The invention is not limited to the above embodiment but various modification thereof may be made. It will be understood by those skilled in the art that various changes in form and detail may be made without departing from the scope of the present invention as defined by the appended claims.

Claims: A pipe cutter comprising: a body (10) having a first end with a rod (11) movably extending therethrough and a second end having a first contacting member (12) rotatably connected thereto; a first link (13) having a first end thereof pivotally connected to said body and a second end thereof having a disk blade (14) rotatably connected thereto, said rod being pivotally connected to said first link, and a second link (15, 35, 403) having a first end thereof pivotally connected to said first link and a second end thereof having a second contacting member (16, 36) rotatably connected thereto, characterised in that the body comprises two side walls (102) each having an arcuate surface (100, 300) defined thereon and in that the second contacting member (16, 36) comprises two protrusions (160, 360) extending centrally and longitudinally from two ends of the second contacting member and respectively cooperate within the two arcuate surfaces (100, 300) when the second contacting member (16, 36) moves between extreme positions beside and widely separated apart from the first contacting member (12) according to a movement of the disk blade (14). The pipe cutter as claimed in claim 1, wherein each said arcuate surface is comprised in an arcuate slot (100) formed in the side wall (102). The pipe cutter as claimed in claim 1, wherein said arcuate surface is an arcuate notch (300) formed in the side wall (302, 400, 500). The pipe cutter as claimed in anyone of the claims 1 to 3, wherein said body (10, 30) comprises an arcuate plate (101, 301) and said two side walls (102, 302) extend from two opposite sides of said arcuate plate. The pipe cutter as claimed in anyone of the claims 1 to 3 further comprising a connecting plate (501) connected between said two side walls (500). The pipe cutter as claimed in anyone of the preceding claims further comprising a knob (110, 310) connected to one of two ends of the rod (11, 31, 404). The pipe cutter as claimed in anyone of the preceding claims, wherein said rod is a threaded rod (11, 31, 404). The pipe cutter as claimed in anyone of the preceding claims further comprising a tube (111, 311) rotatably received in said first end of said body (10, 30) and said rod (11, 31) movably extending through said tube. The pipe cutter as claimed in anyone of the preceding claims, wherein each of said two side walls (101, 301, 400, 500) has an arcuate recess (103, 303) defined in one of two sides thereof so as to be adapted to receive a pipe (40, 41, 44, 45) to be cut. The pipe cutter as claimed in claim 1, wherein each of said first link (13, 33, 402) and said second link (15, 35, 403) includes two plates connected with each other with a gap defined between said two plates.

Inventors: HU BOBBY, HU, BOBBY
Applicants: HU BOBBY, HU, BOBBY
Application year: 1999
Main classification: B23D21
IPC codes: B23D21