CA1158153A - Floor or bench mounted conduit cutting device - Google Patents
Floor or bench mounted conduit cutting deviceInfo
- Publication number
- CA1158153A CA1158153A CA000377309A CA377309A CA1158153A CA 1158153 A CA1158153 A CA 1158153A CA 000377309 A CA000377309 A CA 000377309A CA 377309 A CA377309 A CA 377309A CA 1158153 A CA1158153 A CA 1158153A
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- CA
- Canada
- Prior art keywords
- conduit
- blade element
- cutting device
- operating handle
- side plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Abstract
Abstract of the Disclosure Apparatus for cutting a conduit or tubular element transversely to the longitudinal axis thereof which in-cludes a base having a housing projecting vertically therefrom. The housing includes opposed, substantially parallel side plates separated by a vertical slot at their upper ends, and by a mechanism chamber at their lower ends. A blade element is pivotally supported be-tween the parallel side plates, and carries a plurality of ratchet teeth along the lower peripheral edge, and a cutting edge disposed at the opposite side of the blade element from the ratchet teeth. Between the teeth and cutting edge, the knife element has an elongated, arcuate slot formed therethrough. An operating handle is pivotally connected to the housing at a side thereof spaced from the pivotal axis of the blade element. A pawl lever is pivotally connected to the operating handle and has a dog thereon positioned to ride over and operatively engage the ratchet teeth as the operating handle is pivoted.
An elongated indexing link is pivotally connected at one end to the pawl lever and carries a stud at its other end which rides in the arcuate slot in the blade element.
A conduit supporting jaw is mounted at the upper side of the housing, and defines an arcuate recess dimensioned to support a conduit to be cut by the apparatus.
An elongated indexing link is pivotally connected at one end to the pawl lever and carries a stud at its other end which rides in the arcuate slot in the blade element.
A conduit supporting jaw is mounted at the upper side of the housing, and defines an arcuate recess dimensioned to support a conduit to be cut by the apparatus.
Description
FLOOR OR BENCH MOUNTED CONDUI`r CUTTING DEVICE
sackground of the Invelltion 1. Field of the Invention This inven-tion relates to devices for transversely cutting through rigid and semi-rigid tubular members, such as synthetic resin conduit, and more particularly rela-tes to apparatus which can be operated by hand, to shear through a tubular element along a plane extending normal to the longitudinal axis of the tubular element.
sackground of the Invelltion 1. Field of the Invention This inven-tion relates to devices for transversely cutting through rigid and semi-rigid tubular members, such as synthetic resin conduit, and more particularly rela-tes to apparatus which can be operated by hand, to shear through a tubular element along a plane extending normal to the longitudinal axis of the tubular element.
2. Brief Description of the Prior Art _ _ In Nakamura et al. U. S. Patent 4,084,317, a shearing tool for cutting through synthetic resin tubes is disclosed. The Nakamura shearing tool includes a pair of movable handle elements, one of which carries a fixed jaw which moves with the handle, and the other of which is pivotally connected to the first handle adjacent the jaw. The second of the handles,which does not carry a fixed jaw, has a serrated lever connected thereto which acts through a pivoted linkage to cause the fixed jaw to pivot through an increment of pivotal movement each time the second handle ele-ment is pivoted relative to the first handle element.
Devices which can be used for cutting through structures such as synthetic resin tubular elements are also shown in Florian U. S. Patents 3,390,455 and 3,273,240. Both of these structures include elongated handle elements, one of which carries a fixed jaw, and the other of which pivots on the first handle element at a location adjacent the fixed jaw and actuates a second jaw 1158~53 pivotally mounted on the first-mentioned handle element through an interconnecting linkage whicll includes ratchet teeth and a lever carrying a pin which acts upon the teeth of the ratchet as the handles are pivoted toward and away from each other.
Brief Description of the Present Invention The present invention is an apparatus suitable for mounting on a floor, bench or other supporting platform, and for cutting through a conduit or tubular element in a direction transverse with respect to the longitudinal axis of the conduit or tubular element. The apparatus includes a base for supporting the remain-ing portion of the structure on the floor, bench or other support-ing platform, and a housing mounted over and secured to this base for supporting the cutting mechanism and the conduit to be cut.
The housing includes opposed, substantially para]lel side plates which are separated by a vertical slot located between the upper end portions of the two side plates, and by a mechanism chamber located below the slot and between the lower end portions of the two side plates. A blade element is pivotally supported between the parallel slde plates, and carries a plurality of ratchet teeth along its lower peripheral edge. A cutting edge is formed on one side of the blade element opposite the ratchet teeth. Between the teeth and the cutting edge,the knife element has an elongated, arcuate slot formed therethrough.
An operating handle is pivotally connected to the housing at a side thereof spaced from the pivotal axis of the blade element, 1 158~i3 and certain operating mechanism interconnects the operating handle with the blade element to cause pivotation of the blade element about its pivotal axis. The operating mechanism includes a pawl lever which is pivotally connected to the operating handle, and which has a dog on one end thereof to ride over, and operatively engage, the blade element ratchet teeth as the operating handle is pivoted. ~n elongated indexing link is pivotally connected at one end to the pawl lever and carries a stud at its other end which extends into and rides in the arcuate slot in the blade element. A conduit supporting jaw is mounted at the upper side of the housing and defines an arcuate recess dimensioned to sup-port a conduit to bc cut by the apparatus as the blade elemen-t undergoes pivotal movement when the operatinghandle is actuated.
An important object of the present invention is to provide ]5 a mechanically sturdy, reliable conduit cutting device which can be used to quickly and cleanly cut through a tubular conduit of synthetic resin.
A further object of the invention is to provide a conduit c~utting device which can be supported on -the floor and operated by hand, and which can be used to cut through conduits of various diametric sizes.
A further object of the invention is to provide a floor or bench mounted conduit cutting device which has a minimum of moving parts, each sturdily interconnected for reliability during operation, and which device is characterized in having a long 11~81$~
and trouble-free operatinc3 life.
A further object of -the invention is to provide a conduit cut-ting device which can be mounted upright on a floor or supporting structure and used to manually cut conduit quickly to a precisely measured length, or can be turned on its side, anchored by a foot plate, a~d used to cut conduit in a field location where no sta-tionary securing and mounting structure is available.
Additional objects and advantages of the present invention will become apparent as the following detalled description of apre-ferred embodiment of the invention is read in conjunction with the accompanying drawings which illustrate such preferred embodiment.
General Description of the Drawings Figure 1 is a side elevation view of a conduit cutting device constructed in accordance Witll the present invention.
Figure 2 is a plan view of the conduit cutting device shown in Figure 1.
Figure 3 is a view, partly in section and partly in elevation,~
showing the operating mechanism which undergoes movement during the operation of the conduit cutting device of the invention.
Figure 4 is an end elevation view of the conduit cutting de-vice shown in Figure 1 as it appears when viewed from one end thereof .
Figure 5 is a view in elevation, with the handle shown in section, of the conduit cutting device illustrated in Figure 1, and showing the device as it appears when viewed from the opposite end thereof frorn that which is shown in Figure 4.
Figure 6 is a detail view illustrating the manner in which a spring device is employed for causing the operating handle of the device to return to its starting or initial position after it has been pivoted downwardly for purposes of cutting through a conduit usihg tlle conduit cutting device of the invention.
Figure 7 is a view similar to Figure 8, but having the pair of conduit retaining jaws illustrated in Figure 8 removed.
Figure 8 is a sectional view taken along line 8-8 of Figure 1.
Figure 9 is a sectional view taken along line 9-9 of Figure 1.
Figure 10 is a front elevation view of a modified embodiment of the invention with a portion of the handle shown broken away, and showing the conduit cutting device in one of its operating positions.
Figure 11 is a top plan view of the modified embodiment of the invention lllustrated in Figure 10.
Figure 12 is a sectional view taken along line 12-12 of Figure 11.
Figure 13 is a side elevatiori view of the modified embodiment of the invention illustrated in Figure 9.
Figure 14 is a different side elevation view of the modified embodiment of the invention illustrated in Figure 9, as the conduit cutter appears when viewed from the opposite side thereof from that which is shown in Figure 13, and showing the handle in section.
Figure lS is a side elevation view of the modified embodiment of the conduit cutter, showing it disposed in a second operating position. A part of the foot plate is illustrated as broken away.
Figure 16 is a top plan view of the modified embodiment positioned in the second operating position.
Figure 17 is a sectional view taken along line 17-17 of Figure 16.
Detailed Description of a Preferred Embodiment of the Invention Referring initially to the drawings, and particularly to Figure 1, the conduit cutting device of the invention includes a base 10 constituted, in the illustrated embodiment of the inven-tion, by a flat, substantially rectangular plate. The base 10 is provided with apertures 12 in several locations to facilitate bolt-ing the base to the floor or other supporting platform. Projecting upwardly from the base are a pair of side plates 14 and 16 which are rigidly supported by web 1anges 18 and 20 (see Figures 2 and 4). As will be noted in Figure 4, the side plates 14 and 16 are separated by a vertically extending slot 22 at their upper ends and further, as shown in Figures 4 and 5, define a cavity or chamber 24, hereinafter referred to as a mechanism chamber, spac-ing the side plates at their lower end portions. The side plates are joined by interconnecting web portions 26 and 28 disposed adjacent the base 10 and the upper side of the side plates 14 and 16 at a location opposite the slot 22, respectively, as best il-lustrated in Figures 3 and 5. A blade element, designated-gen-erally by reference numeral 30, is pivotally supported between the side plates 14 and 16 by means of a pivot pin 32 which ex-tends throughacentral portion of the blade element. As shownin Figure 9, a counterbore 33 is formed in the side plate 14 and receives a compression spring 35 which bears at one end against ~ 1~8153 the blade element 30 to frictionally retain the blade element at a location to which it is advanced during the conduit cutting op-eration as hereinafter described, The blade element 30 includes a tapered portion 34 which terminates in a straight cutting edge 36 along one side of the blade element, and further includes a ser-rated arcuate edge surface which has a plurality of ratchet teeth 38 formed thereon (see Figure 3). The blade element 30 is posi-tioned between the side plates 14 and 16 for pivotation in the slot 22, and the lower portion of the blade element projects down-wardly into the mechanism chamber 24, as best illustrated in Figures 3 and 5.
At the upper slde of the two side plates 14 and 16, the side plates are recessed to provide a pair of oppositely facing jaw element cavities 40 and 42. The jaw element cavities 40 and 42 cooperatively receive a pair of jaw elements 44. Each jaw element is of arcuate configuration and includes a flange element 44a which projects into one of the respective jaw element cavities 40 and 42 as shown in Figure 8. When in place, the two jaw elements 44 define between them a slot 50. Also, on the arcuate or con-cave inner side of each of the jaw elements 44, a surface of semicircular configuration is located and is dimensioned for re-ceiving, in the manner shown in Figure 3 in dashed lines, a tu-bular conduit or pipe 52 which is to be cut through in a direction transverse with respect to the longitudinal axis thereof.
As will be hereinafter explained in greater detail, the jaw elements 44 can be relatively easily inserted in and removed from the respective jaw element cavities 40 and 42 and, in a preferred ~ ~.
embodiment of the invention, a series of interchan~eable jaw ele-ments are provided which have their concave inner surfaces di-mensioned for the reception of the pipe or conduit to be cut through. These sets of jaw elements are oE various sizes at their concave inner peripheries to permit the accommodation and holding o~E condults of various diametric sizes. In each case, the semi-circular configuration of the concave inner sides of the paired jaw elements will precisely register with the'ex-ternal periphery of the pipe or conduit to be cut through so that it is fully supported durin~ the cutting operation.
On the opposite side of the side plates 14 and 16 from the location where the pivot pin 32 supports the hlade element 30 be-tween the side piates, an elongated operating handle 54 has one of its ends pivotally connected between the side plates in the manner best illustrated in Figures 1 and 3. The end portion of the operating handle 54 which is pivotally connected between the side plates 14 and 16 is bifurcated so as to provide a slot be-tween opposed side portions thereof. Projecting into this slot is an end portion of a pawl lever 60 and, as illustrated in Figures 2, 3 and 5, the pawl lever is here pivotally connected to the operating handle 54 by pivot pin 58.
The pawl lever 60 is generally U-shaped in configuration, having an upturned toe portion 60a at that end thereof which is pivotally connected to the operating handle 54 and having an up-wardly turned dog 60b at the other end thereof. The dog 60b ofthe pawl lever 60 tapers to a pointed end to facilitate engagement with the ratchet teeth 38 carried on the blade element 30. Forthe :
purpose of restoring the operating handle 54 and the pawl lever 60 connected thereto to its initial position (as shown in full lines in Fiyure 3) after -the operating handle has been pivoted downwardly to the dashed line position shown in that Figure, a return spring 62 is connected in any suitable way between the opera-ting ha~dle and pawl lever to effect such restorative move-ment. In the illustrated embodiment, the return spring 62 is a helical tension spring having one end connected over a pin 64 carried on the operating handle 54 and the other connected in any suitable way to the pawl lever 60.
The inner end of -the pawl lever 60 or, stated differently, that end which is displaced distally from the end 60a of the pawl lever is located within the mechanism chamber 24. The end portion of the pawl lever 60 which is adjacent the dog 60b has pivotally connected thereto through a suitable pivot pin 68, a pair of elon-gated substantially parallel indexing links 70. The two indexing links 70 extend on opposite sides of the blade element 30, and have their ends opposite the pivo-t pin 68 interconnected by a suitable pin 72. The pin 72 extends through an arcuate slot 74 formed in the blade element 30. The arcuate slot 74 is positioned and is con-figured so that the indexing links 70 are guided in such a way that the dog 60b carried on the end of the pawl lever 60 is guided in its up and down movements so that it will engage successive ones of the ratchet teeth 38 during each successive downward stroke of the oper-ating handle 54. These movements will be better understood from the _9_ 1 1581~3 following detailed description of the operation of the inven-tion.
Operation . . _ In the operation of the floor mounted conduit cutting device of the invention, th~ device is first securely mounted on a stable surface such as a floor. In this regard, the base 10 can be bolted or otherwise,suitably secured to the floor to assure adequate stabili-ty in the apparatus. A pair of jaw elements 44 is next selected for positioning in the jaw element cavities 40 and 42, according to the diametric size of -the synthetic resin tubular conduit or pipe which is to be cut using the device of the inven-tion. As previously explained, the arcuate inner peripheral edges of the jaw elements 44 are configured to mate with various diamet-rically sized conduits, so that complete support is given to the tubular element or conduit over approximately one-half of its entire periphery when it is placed in the jaw elements in the posi-tion illustrated in Figures 1 and 3.
With the selected jaw elements 44 pressed into the jaw element cavities 40 and 42, the cutting operation is then commenced. In undertaking the cutting of the conduit, -the operating handle 54 is grasped by its outer end (not shown), and is pivoted downwardly about the pivot pin 56. This causes the pawl lever 60 to undergo movement from a position typified by that shown in full lines in Figure 3 to that position which is illustrated in Figure 3 by dashed lines. In undergoing this movement, the dog 60b engages one of the ratchet teeth 38 and causes the blade element 30 to 1~58~53 pivot about the pivo-t pin 32. Such pivotal movement of the blade element 30 advances the straigllt cutting edge 56 toward the con-duit 52. The compression spring 35 mounted around the pivot pin 32 exerts a s,ufficiellt frictional force on the side of -the blade element 30 that it is retained in its advanced position at the end of the s,troke of the operating handle 54, and does not fall downwardly to its initial position.
As the operating handle 54 is retracted from its dashed line position of Figure 3 to -the full line position shown therein, the pawl lever 60 is also retracted so that the dog 60b moves down-wardly and -to the left as viewed in Figure 3. Upon recommencement of the downward stroke of -the operating handle 54, the indexing links 70 assure that the dog 60b will be guided upwardly and into the next succeeding ratchet tooth 38 to effect a further incre-mental pivotal movement of the blade element 30.
The described operation of the operating handle 54 is repeateda number of times until the straight cutting edge 36 is caused to shear through the tubular conduit 52. In this regard, it will be noted that the jaw elements 44 are spaced from each other so that the cutting edge 36 can pass completely through the tubular conduit 52. After the conduit has been severed by the cutting action of the blade element 30, the blade element can be pivoted back to its open position preparatory to another cutting operation. This is effected by lifting up on the operating handle 54 to move it to a position well above the solid line position in Figure 3. This 1 1~8153 movement will in turn cause the indexincJ links 70 and pin 72 to pull the blade element 30 througll a pivo-tal movement back to its starting position.
A modified embodiment of the conduit cutter apparatus of the invention is illustrated in Figures 10-17 of the drawings.
As this embodiment of the inven-tion is illustrated in Figures 10-17, it includes a two-part housing 80 made up of two side casting subassemblies 82 and 84 which are bolted together by means of bolts 86, 87 and 88. Each of the side plate casting subassemblies 82 and 84 includes a vertically extending side plate 90 having a base flange 92 projecting normal to the lower end thereof. A yusset web 9~ extends between each of the side plates 90 and the respective base flange 92 which extends there-from. Base flanges 92 project in opposite directions to form a supporting base for the cut-ter apparatus.
Each of the side plate casting subassemblies 82 and 84 further includes a horizontally extending, downwardly opening receiving channel 9G for receiving a measuring elemen-t used con-junctively with the cutter apparatus as hereinafter described.
It will be noted in referring to Figures 10-1~ that the hori-zontally extending, downwardly opening receiving channels 96 are each arcuately shaped to provide an opening in the bottom plane of each of the base flanges 92, and that the receiving channels are horizontally aligned when the two side plate casting subassemblies 82 and 84 are bolted to each other. It --1~--1 1~81~3 will be further noted in referring to I`igures 12 and 14 -that bosses 97 are formed on the facing sides of each of the two side plates 90, and in alignrment with each other, for the purpose of receivinc3 -the bolts 86 and 87 therethrough, and also to retain the side casting subassernblies 82 and 84 in proper spatial rela-tion -to each other. The downwardly opening receiving channels 96 are similarly formed to project in alignment with each other when the side plate subassemblies 82 and 84 are abutted. Finally, each of the side plates 90 includes a laterally projecting boss portion 89, and these boss portions are in alignment with each other and are abutted at the time that the side casting sub-assemblies 82 and 84 are bolted together for purposes of oper-ating the conduit cutter apparatus.
It will be noted in referring to Figures 10 and ll tha-t each of the base flanges 92 carries a pair of horizontally spaced, inwardly projecting U-shaped recesses 102 adjacent the laterally outer edges. The recesses 102 are provided to facilitate screwing or bolting the cutting apparatus t,o a table or the like, and also for the accommodation of locking bolts which are employed during the mode of operation in which the apparatus is extended horizon-tally along the floor in the manner hereinafter described. For the purpose of enabling a measuring element to be retained in a selected position within the downwardly opening receiving channels 96, a pair of wing nuts 104 are threaded through threaded aper--tures formed in the crest of each of the downwardly opening receiving channels 96 as shown in Figures 10 and 11.
At a time when the side casting subassemblies 82 and 84 are bolted toyether i.n their assembled relationship as shown in Figures 10 and 11, they clefine between thern a space 105 as shown in F'igures 13 and 14. The space 105 accommodates the operating mechanism oiE the embodiment of the conduit cutter apparatus shown in Figures 10-17. Such operating mechanism includes an elongated pawl lever 106 having an upturned toe portion 106a at an outer end thereof and located within the space 105. A large, plate-type blade element 108 is pivotally supported upon a pivot shaft 110 between a pair of protuberant lugs 90a which project from the two side plates 90. The blade element 108 is spring loaded by a com-pression spring (no-t shown) in the manner hereinbefore described.
The blade element 108 utilized in the embodiment of the in-vention illustrated in Figures 10-17 is similar to that depicted in the embodiment of the invention hereinbefore described.and illus-trated in Figures 1-9. The blade element 108, however, in-cludes a plurality of ra-tchet teeth 114 which extend around a major portion of its peripheral edge and cover about 190 of a circumference of a circle upon which the ratchet teeth are formed.
The blade element 108 further includes a tapered portion 116 which terminates in a straight cutting edge 118. A pair of overlapping arcuate slots 120 and 122 are formed through the blade element 108 at a location between the pivot shaft 110 and the ratchet teeth 114 and are concentric to each other and the pivot shaft. The slots 120 and 122 extend collectively over an arc of about 180 but are ar-ranged for individual, independent use in alternate modes of opera-tion of the condui-t cu-tter apparatus as hereinafter described.
1 1581!i3 ~ pair of parallel indexing links 128 and 130 are inter-conrlected at one end by a pivot pin 132 which extends through a slot 134 formed at the base of the upwardly turned dog 106b.
'l`he length of the slot 134 is such that the pivot pin 132 can move slidably within the slot over a short distance. ~t their ends opposite the ends connected by the pivot pin 132, the in-dexing links 128 and 130 are in-terconnected by a connecting pin 136 which extends between the ends of the links and through a selec-ted one of the arcuate slots 120 and 122. In the opera-tional mode of the cutter shown in Figures 10-14, the connecting pin 136 is shown extending through the arcuate slot 122. It will be noted in referring to Figure 12 that each of the indexing links 128 and 130 defines a small aperture 138 spaced inwardly in the link from the location of the connecting pin 132, and also defines an alternate aperture 135 spaced along the respective link from the apertures which receive the pivot pin 134 in the mode of assembly illustrated in Figure 12. The apertures 135 and 138 func-tion as an alterna-te site for extension of the pivot pin 134 and connecting pin 136, respectively, through the two indexing links at a time when the apparatus is used in the mode illustrated in Figures 15-17 as hereinafter described.
For the purpose of actuating the blade element 108 to cut through a conduit supported in arcuate recesses 140 formed in each of the side plates 90, a handle subassembly 142 is provided.
The handle subassembly 142 includes an arm 144 of substantially ll58153 rectangular cross-section. The arm 144 has a cross-sec-tionally U-shaped central portion 144a which is hollowed out to facilitate the reception of the upturned toe portion 106a of the pawl lever 106. The upturned toe portion 106a is connected to the arm 144 of the handle assemb]y by a pivot pin 146 projected through the two opposed~side portions of the arm 144. A second pivot pin 147 secures an inner end of the arm 144 between the side plates 90.
A spring 148 is turned about the pivot pin 146 and one end of the spring is inserted under and bears against a stop pin 150 passed through the arm 144. The other end of the spring hooks be-neath the lower edge of the pawl lever 106 in the manner shown in Figure 10. It will be noted in referring to Figure 10 that at a point spaced along the pawl lever 106 from the end thereof at which the upturned toe portion 106a is located, the pawl lever has an aperture 152 formed therethrough for a purpose hereinafter de-scribed. It will also be noted that the arm 144 of the handle as-sembly 142 has an alternate aperture 151 formed therethrough. The use of this alternate aperture will be hereinafter explained.
At the end of the arm 144 opposite its end which is secured between the side plates 90 by the use of the pivot pin 147, the arm is solid, as contrasted with hollowed or bifurcated, and car-ries a transversely extending latching key 106 which projects from the opposite sides of the arm. One of the projecting ends of the latching key 160 can be seen in Figure 10. A generally cylindrical or tubular handle extension 162 is engaged with the arm 144. In connecting the extension to the arm, the solid ]6-11581~3 end of the arm is inserted ln-to an opell elld of the handle exten-sion 162, passinc3 the latching key 160 along axially extending portions of L-shaped slots 164 formed in the opposite sides of the tubular ~andle extension. The handle extension is then rotated to cause the projecting ends of the transversely extend-ing latching key 160 to move into the circumferentially extending portions of the pair of L-shaped slots 164 located on opposite sides of the handle extension.
As will be hereinafter explained in detail, the embodiment of the invention depicted in Figures 10-17 is susceptible of use in a selected one of two different ways of operation. In the upright posi-tion, illustrated in Figures 10-14, the base flanges 92 are placed in flatly abutting contact with a work table or other supporting structure, and are secured in this position by means of bolts or other suitable hold-down devices extended through the inwardly projecting U-shaped recesses 102 and through the tabletop or other supporting su~face. A conduit is then placed in a position to be cut through by the blade element 108.
This position is within concavities 140 which are formed in the upper sides of each of the vertically extending side plates 90.
Cutting through the condui-t is then effected by downward recipro-cation of the halldle subassembly 142 in a series of strokes as hereinafter explailled in greater detail.
In order to permit the conduit which is -to be cut with -the cutter device in the r.lanner described to be measured to a precise 11581~i3 and selected length, a measuring device 170 is extended through the horizontally extending, downwardly openi.ng receiving channels 96 formed in each of the base flanges 92 so that an end portion of the measuring device projects laterally from at least one of the base flanges, and extends normal to the line of travel of the blade èlement 108 through the conduit. The measuring device 170 will generally have, as a portion thereof, a conduit stop plate 172 which projects normal to an elongated scale-carrying portion 174 of the device. In the use of the measuring device 170, one end of the conduit to be cut is abutted against the conduit stop plate 172.
To obtain an accurate reading of the scale carried on the graduated portion 174 of the measuring device 170, a blade stop shaft 180 is extended be-tween the side plates 90 at a location where the side plates are spaced near their upper ends to facili-tate passage of the cutting edge 118 of the blade between the side plates. The blade stop shaft 180 carries a hairline-type index marker 182. The measuring device 170 can then be shifted in the channels 96 until the desired length of conduit to be cut is seen as corresponding to -the appropriate indicia on the scale-carrying portion which is aligned with the index marker 182.
For the purpose of using the embodiment of the invention il-lustrated in Figures 10-16 in the alternate mode of utilization, a foot plate subassembly 186 is provided. The foot plate sub-assembly 186 includes a flat, horizontally extending base plate 1 1~8153 188 which is provided adjacent one edge -thereof with a pair of bolt holes 190 and 192. Projecting upwardly from, and normal to, the base plate 188 at the edge -thereof which is adjacent the bolt holes 190 and 192 is an abutment plate 194 which extends transversely across the width of the base plate. A pair of triangular reinforcing plates 196 and 198 are placed at the corners of the foot plate subassembly 186 to impart enhanced structural strength to the abutment plate 194.
Adjaoent the upper edge and at opposite ends of the trans-versely extending abutment pla-te 194, a pair of locking bosses 200 and 202 project normal to the plane of the abutment plate and ou-twardly tllerefrom on the side of the abutment plate which is opposite the side at which the base plate 188 is located. The position of the locking bosses 200 and 202 is such that when the base plate 188 is placed flat on the upper surface of a -table or other supporting structure, and the conduit cut-ter is turned on its side so that tlle straight side edges of the sicle plates 90 also flatly abut such surface, the abutment bosses 200 and 202 will project into, and register wit~, the horizontally extending, downwardly opening receiving channels 96 formed in the two base flanges 92. This relationship is best illustrated in Figures 15 and 17.
In order to provide for further interlocking of the base flanges 92 of the collduit cutter with the foot plate subassembly 186, the abu-tment plate 194 has a pair of threaded bolt openings 1 ~58153 206 formed therein in a position of alignment with the inwardly projectinc; U-shaped recesses 102 formed adjacent one edge of each of the base flanges 92. This facilitates the extension of bolts 208,1-~aving threaded shanks into the threaded bolt openings thus provided, with the heads of the bolts drawing the base flanges 92 tigll-tly against the abutment plate 194 in the manner best illustrated in Figures 15 and 16.
In the utilization of the embodiment of the invention il-lustrated in Figures 10-17, one mode of usage contemplates the placement of the conduit cutter device in an upright position in which the base flanges 92 flatly abut a supporting structure such as a table. Generally it will be desirable to bolt the structure to the table by placing the retention bolts in the inwardly pro-jecting U-shaped recesses 102 and tightening them down.
With tlle conduit cutter thus stabilized and anchored, the measuring device 170 may then be placed in position for utiliza-tion if desired. Where the measuring device 170 is to be used, the elongated scale carrying portion 174 thereof is passed through the aligned downwardly opening receiving channels 96 so that the scale carrying portion rests on the top of the table, and extends through the aligned receiving channels. The scale carrying portion 174 is then slid along the top of the table until the distance which separates the condui-t stop plate 172 and the plane in which the blade element 108 will move in cutting through a conduit is that which is indicated by a selected length ~2u~ 7 measuring indicia carried on the scale carrying portion then in vertical aliynment with the index marker 182 carried on the blade stop shaft 180. This is ascertained by visual sighting from above the st~ucture to obtain visual alignment of the index 5 marker 182 with the appropriate indicia forming a part of the scale on the scale carrying portion 172 of the measuring device 170. It will be understood that o-ther forms of length measure-ment of the conduit using the conduit stop plate 172 as the zero bench mark can also be employed.
Wi-th the measuring device 172 thus positioned, the wing nuts 104 are tightened down to assure that the measuring device will be retained in the proper position. ~fter -this, the conduit which is to be cut into a selected length inthose instances where the measuring device 170 is being utilized will be placed in the con-cavities 140 for~ed in the upper side edges of the side plates 90.
In most instances, the conduit stop plate 172 will have a suitable flange 173 or the like which will aid in holding the conduit in this position by supporting the free end of the conduit which is abutted against the conduit stop plate.
With the conduit so positioned and ready for cutting, and with the mechanism interconnected as illustrated in Figures 10-14, the handle subassembly 142 is next actuated by pushing down upon the tubular handle extension 162. The handle extension 162 has previously been interlocked with the arm 144 in the manner herein-before described. As the handle extension 162 is pivoted down-\
l 1581~3 wardly about the pivot pin 147, the elonyated pawl lever 106 is caused to move toward the right as the pawl lever is viewed in Figure 12. This movement, in conjunction with the guiding func-tion afforded by the connec-tion of the pawl lever 106 to the indexing links 128 and 130,causes the upwardly turned dog 106b of the pawl lever to enter the space between two of the ratchet teeth 114.
Continued downward movement of the handle subassembly 142 causes the dog 106b of the pawl lever 106 to push against the ratchet teeth 114 to cause the blade element 108 to undergo an increment of rotation abou-t the pivot shaft 110. This increment of rotation is completed upon the completion of the downward pivotal s-troke of the handle subassembly 142. The handle sub-assembly 142 is then raised up again to about the position illus-trated in Figures 10 and 12, or slightly higher, to retract the dog 106b from the ratchet teeth 114. At this time, the dog 106b is guided by the action of the indexing links 128 and 130 to a position where it is aligned with the next adjacent opening be-tween the next adjacent pair of ratchet teeth 114. Upon the next downward stroke of the handle subassembly 142, the previously described action is repeated, except that the dog 106b enters the opening between the next adjacent pair of ratchet teeth, and then pushes the blade element 108 through a further increment of ro-ta-tion.
Over a series of strokes of the handle subassembly 142 of the 1 1581~3 the type described, -the blade element 108 is advanced through an accumulative series of increments oE rotation so that the cutting edge 118 of the blade element is ultimately brought into contact with the outer periphery of the conduit resting in the concavities 140 formed in the upper side edges of the side plates 90. ,After this, several additional strokes of the handle subassembly 142 are carried out to cause the cuttiIIg edge 118 of the blade element 108 to be advanced through the conduit to shear it along a diametric plane. Ultimately, the conduit is sheared completely through, and the stop shaft 180 assures that no further advance of the blade will occur.
~t this time, the tubular halldle extension 162 is lifted upwardly to a positio. such that the handle subassembly 142 ex-tends u~wardly at a substantial angle from the substantially horizontal position illustrated in Figures 10 and 12. This action will cause the pawl lever 106 to be pulled toward the left as i-t is viewed in Figure 12, carrying with it the indexing links 128 and 130 which, at this time, are located so that the connecting pin 136 is very close to the trailing end of the slot 120. Re-traction of the indexing links toward the left will therefore cause the blade element 108 to be reversed in its direction of rotation and pulled back -to substantially its starting position.
The conduit cutter device embodiment illustrated in Figures 10-14 can be easily converted for use in the mode illustra-ted in Figures 15-17. In this manner of usage, the two-part housing 80 ~,c~
':
1 1~8153 is turned over on its side so that it rests upon the straight side edges of the s:ide plates 90 and upon the coplanar aligned edges of the base flanges 92. The pivot pin 147 is then removed to permit the arrn 144 -to be detached from the housing 80, and the tubular handle extension 162 is also disconnected from the arm by rotation.of -the handle extension to permit the latching key 160 to be slid outwardly through the axially extending portions of the L-shaped slots 164.
When these detachments have been effected, the arm 144 is 10 then manipulated to push the pawl lever 106 and the indexing links 128 and 130 connected thereto to the right through the space 105 between the ver-tically extending side plates 130 un-til the point of connection of the indexing links to the pawl lever is exposed on the right side of the housing 80 as it is viewed in 15 Figure 10. At this time the pawl lever can be disconnected from the two indexing links 128 and 130 by removal of the pivot pin 132. The pawl lever can then be withdrawn by pulling it out of the space 105 and to the left of the housing 80. The arm 144 of the handle subassembly 142 is then reconnected by extending the 20 pivot pin 147 through the openings 91 provided through the side plates 90 on the right side of the housing 80 as it is viewed in Figure 10 or, when the housi.rlg is turned on its side, near the top side of the housing as viewed in Figure 15. The arm 144 is then connected to the pawl lever 106 by extension of the pivot 25 E~in 146 through the alternate aperture 151 provided in the arm 144 and through the aper-ture 152 provided through -the pawl lever 106 at a point spaced downwardly along the lever from the up-turned toe portion 106.l. In this arrangement, the spring 1~8 is relocated to ex-tend between -the pawl lever and the solid portion S of the arm 144 in the manner shown in Figures 15 and 17. The upwardly tu~ned dog 106b of -the pawl lever 106 is then connected to the indexing links 128 and 130 (after they have been discon-nected from the blade by removal of the pin 136) by extension of the pivot pin 132 -through the alternate apertures 135 in each of the two indexing links and through the slot 134 formed in the dog. Finally, the connecting pin 136 is re-extended through the outer ends of the two indexing links 128 and 130 and through the slot 122 formed in the blade element 108.
With the conduit cutter device arranged in the described manner, the last step preparatory to using the device is to secure the foot plate subassembly 182 thereto. This is accomplished by initially placing the foot pla-te subassembly 186 immediately ad-jacent the base flanges 92 of the two-part housing 80 so that the locking boss 202 projects into the two horizontally extending, downwardly opening receiving channels 96 formed in each of the base flanges 92. At this time, the wing nuts 104 are substan-tially retracted so that mating registration of the boss 202 with the channels 96 can be effected. Finally, the bolts 208 are fit-ted into the threaded bolt openings 206 formed in the abutment plate 194 with the heads of the bol-ts bearing against the upper surfaces of the base flanges 92, and the shanks of the bolts .
l 15815~
passing through the inwardly projecting U-shaped recesses 102 in the manner illustrated in Figure 15.
With the conduit cutter apparatus -thus assembled, relatively large diametçr conduit can be cut through by laying it in the con-cavities 1~0 formed in the upper si.de edges of the side plates 90oE the two-part hoùsing 80. The operator then stands on the base plate 188 of the foot plate subassembly 186 to hold the apparatus stationary, and a-t this time manipulates the tubular handle exten~
sion 168 in a pivotal movement to actuate the blade element 108 in a series of incremental pivotal movements. The blade element is again caused to contact and shear through the conduit in the manner hereinbefore described. Alternately, the base plate 188 of the foot plate subassembly 182 can be bolted to the supporting structure by extending bolts through the bolt holes 190 and 192.
Although certain preferred embodiments of the invention have been herein described in order to illustrate the basic principles which u.nderlie the invention, i-t will be understood that various challc3es of structure can be made in the apparatus without depar-ture from such basic principles or alteration of the general mode of operation of the struc-ture. Changes and alterations of -this type are therefore deemed to be circumscribed by the spirit and scope of the invention except as the same may be necessarily limited by the appended claims or reasonable equivalents thereof.
What is claimed i5:
Devices which can be used for cutting through structures such as synthetic resin tubular elements are also shown in Florian U. S. Patents 3,390,455 and 3,273,240. Both of these structures include elongated handle elements, one of which carries a fixed jaw, and the other of which pivots on the first handle element at a location adjacent the fixed jaw and actuates a second jaw 1158~53 pivotally mounted on the first-mentioned handle element through an interconnecting linkage whicll includes ratchet teeth and a lever carrying a pin which acts upon the teeth of the ratchet as the handles are pivoted toward and away from each other.
Brief Description of the Present Invention The present invention is an apparatus suitable for mounting on a floor, bench or other supporting platform, and for cutting through a conduit or tubular element in a direction transverse with respect to the longitudinal axis of the conduit or tubular element. The apparatus includes a base for supporting the remain-ing portion of the structure on the floor, bench or other support-ing platform, and a housing mounted over and secured to this base for supporting the cutting mechanism and the conduit to be cut.
The housing includes opposed, substantially para]lel side plates which are separated by a vertical slot located between the upper end portions of the two side plates, and by a mechanism chamber located below the slot and between the lower end portions of the two side plates. A blade element is pivotally supported between the parallel slde plates, and carries a plurality of ratchet teeth along its lower peripheral edge. A cutting edge is formed on one side of the blade element opposite the ratchet teeth. Between the teeth and the cutting edge,the knife element has an elongated, arcuate slot formed therethrough.
An operating handle is pivotally connected to the housing at a side thereof spaced from the pivotal axis of the blade element, 1 158~i3 and certain operating mechanism interconnects the operating handle with the blade element to cause pivotation of the blade element about its pivotal axis. The operating mechanism includes a pawl lever which is pivotally connected to the operating handle, and which has a dog on one end thereof to ride over, and operatively engage, the blade element ratchet teeth as the operating handle is pivoted. ~n elongated indexing link is pivotally connected at one end to the pawl lever and carries a stud at its other end which extends into and rides in the arcuate slot in the blade element. A conduit supporting jaw is mounted at the upper side of the housing and defines an arcuate recess dimensioned to sup-port a conduit to bc cut by the apparatus as the blade elemen-t undergoes pivotal movement when the operatinghandle is actuated.
An important object of the present invention is to provide ]5 a mechanically sturdy, reliable conduit cutting device which can be used to quickly and cleanly cut through a tubular conduit of synthetic resin.
A further object of the invention is to provide a conduit c~utting device which can be supported on -the floor and operated by hand, and which can be used to cut through conduits of various diametric sizes.
A further object of the invention is to provide a floor or bench mounted conduit cutting device which has a minimum of moving parts, each sturdily interconnected for reliability during operation, and which device is characterized in having a long 11~81$~
and trouble-free operatinc3 life.
A further object of -the invention is to provide a conduit cut-ting device which can be mounted upright on a floor or supporting structure and used to manually cut conduit quickly to a precisely measured length, or can be turned on its side, anchored by a foot plate, a~d used to cut conduit in a field location where no sta-tionary securing and mounting structure is available.
Additional objects and advantages of the present invention will become apparent as the following detalled description of apre-ferred embodiment of the invention is read in conjunction with the accompanying drawings which illustrate such preferred embodiment.
General Description of the Drawings Figure 1 is a side elevation view of a conduit cutting device constructed in accordance Witll the present invention.
Figure 2 is a plan view of the conduit cutting device shown in Figure 1.
Figure 3 is a view, partly in section and partly in elevation,~
showing the operating mechanism which undergoes movement during the operation of the conduit cutting device of the invention.
Figure 4 is an end elevation view of the conduit cutting de-vice shown in Figure 1 as it appears when viewed from one end thereof .
Figure 5 is a view in elevation, with the handle shown in section, of the conduit cutting device illustrated in Figure 1, and showing the device as it appears when viewed from the opposite end thereof frorn that which is shown in Figure 4.
Figure 6 is a detail view illustrating the manner in which a spring device is employed for causing the operating handle of the device to return to its starting or initial position after it has been pivoted downwardly for purposes of cutting through a conduit usihg tlle conduit cutting device of the invention.
Figure 7 is a view similar to Figure 8, but having the pair of conduit retaining jaws illustrated in Figure 8 removed.
Figure 8 is a sectional view taken along line 8-8 of Figure 1.
Figure 9 is a sectional view taken along line 9-9 of Figure 1.
Figure 10 is a front elevation view of a modified embodiment of the invention with a portion of the handle shown broken away, and showing the conduit cutting device in one of its operating positions.
Figure 11 is a top plan view of the modified embodiment of the invention lllustrated in Figure 10.
Figure 12 is a sectional view taken along line 12-12 of Figure 11.
Figure 13 is a side elevatiori view of the modified embodiment of the invention illustrated in Figure 9.
Figure 14 is a different side elevation view of the modified embodiment of the invention illustrated in Figure 9, as the conduit cutter appears when viewed from the opposite side thereof from that which is shown in Figure 13, and showing the handle in section.
Figure lS is a side elevation view of the modified embodiment of the conduit cutter, showing it disposed in a second operating position. A part of the foot plate is illustrated as broken away.
Figure 16 is a top plan view of the modified embodiment positioned in the second operating position.
Figure 17 is a sectional view taken along line 17-17 of Figure 16.
Detailed Description of a Preferred Embodiment of the Invention Referring initially to the drawings, and particularly to Figure 1, the conduit cutting device of the invention includes a base 10 constituted, in the illustrated embodiment of the inven-tion, by a flat, substantially rectangular plate. The base 10 is provided with apertures 12 in several locations to facilitate bolt-ing the base to the floor or other supporting platform. Projecting upwardly from the base are a pair of side plates 14 and 16 which are rigidly supported by web 1anges 18 and 20 (see Figures 2 and 4). As will be noted in Figure 4, the side plates 14 and 16 are separated by a vertically extending slot 22 at their upper ends and further, as shown in Figures 4 and 5, define a cavity or chamber 24, hereinafter referred to as a mechanism chamber, spac-ing the side plates at their lower end portions. The side plates are joined by interconnecting web portions 26 and 28 disposed adjacent the base 10 and the upper side of the side plates 14 and 16 at a location opposite the slot 22, respectively, as best il-lustrated in Figures 3 and 5. A blade element, designated-gen-erally by reference numeral 30, is pivotally supported between the side plates 14 and 16 by means of a pivot pin 32 which ex-tends throughacentral portion of the blade element. As shownin Figure 9, a counterbore 33 is formed in the side plate 14 and receives a compression spring 35 which bears at one end against ~ 1~8153 the blade element 30 to frictionally retain the blade element at a location to which it is advanced during the conduit cutting op-eration as hereinafter described, The blade element 30 includes a tapered portion 34 which terminates in a straight cutting edge 36 along one side of the blade element, and further includes a ser-rated arcuate edge surface which has a plurality of ratchet teeth 38 formed thereon (see Figure 3). The blade element 30 is posi-tioned between the side plates 14 and 16 for pivotation in the slot 22, and the lower portion of the blade element projects down-wardly into the mechanism chamber 24, as best illustrated in Figures 3 and 5.
At the upper slde of the two side plates 14 and 16, the side plates are recessed to provide a pair of oppositely facing jaw element cavities 40 and 42. The jaw element cavities 40 and 42 cooperatively receive a pair of jaw elements 44. Each jaw element is of arcuate configuration and includes a flange element 44a which projects into one of the respective jaw element cavities 40 and 42 as shown in Figure 8. When in place, the two jaw elements 44 define between them a slot 50. Also, on the arcuate or con-cave inner side of each of the jaw elements 44, a surface of semicircular configuration is located and is dimensioned for re-ceiving, in the manner shown in Figure 3 in dashed lines, a tu-bular conduit or pipe 52 which is to be cut through in a direction transverse with respect to the longitudinal axis thereof.
As will be hereinafter explained in greater detail, the jaw elements 44 can be relatively easily inserted in and removed from the respective jaw element cavities 40 and 42 and, in a preferred ~ ~.
embodiment of the invention, a series of interchan~eable jaw ele-ments are provided which have their concave inner surfaces di-mensioned for the reception of the pipe or conduit to be cut through. These sets of jaw elements are oE various sizes at their concave inner peripheries to permit the accommodation and holding o~E condults of various diametric sizes. In each case, the semi-circular configuration of the concave inner sides of the paired jaw elements will precisely register with the'ex-ternal periphery of the pipe or conduit to be cut through so that it is fully supported durin~ the cutting operation.
On the opposite side of the side plates 14 and 16 from the location where the pivot pin 32 supports the hlade element 30 be-tween the side piates, an elongated operating handle 54 has one of its ends pivotally connected between the side plates in the manner best illustrated in Figures 1 and 3. The end portion of the operating handle 54 which is pivotally connected between the side plates 14 and 16 is bifurcated so as to provide a slot be-tween opposed side portions thereof. Projecting into this slot is an end portion of a pawl lever 60 and, as illustrated in Figures 2, 3 and 5, the pawl lever is here pivotally connected to the operating handle 54 by pivot pin 58.
The pawl lever 60 is generally U-shaped in configuration, having an upturned toe portion 60a at that end thereof which is pivotally connected to the operating handle 54 and having an up-wardly turned dog 60b at the other end thereof. The dog 60b ofthe pawl lever 60 tapers to a pointed end to facilitate engagement with the ratchet teeth 38 carried on the blade element 30. Forthe :
purpose of restoring the operating handle 54 and the pawl lever 60 connected thereto to its initial position (as shown in full lines in Fiyure 3) after -the operating handle has been pivoted downwardly to the dashed line position shown in that Figure, a return spring 62 is connected in any suitable way between the opera-ting ha~dle and pawl lever to effect such restorative move-ment. In the illustrated embodiment, the return spring 62 is a helical tension spring having one end connected over a pin 64 carried on the operating handle 54 and the other connected in any suitable way to the pawl lever 60.
The inner end of -the pawl lever 60 or, stated differently, that end which is displaced distally from the end 60a of the pawl lever is located within the mechanism chamber 24. The end portion of the pawl lever 60 which is adjacent the dog 60b has pivotally connected thereto through a suitable pivot pin 68, a pair of elon-gated substantially parallel indexing links 70. The two indexing links 70 extend on opposite sides of the blade element 30, and have their ends opposite the pivo-t pin 68 interconnected by a suitable pin 72. The pin 72 extends through an arcuate slot 74 formed in the blade element 30. The arcuate slot 74 is positioned and is con-figured so that the indexing links 70 are guided in such a way that the dog 60b carried on the end of the pawl lever 60 is guided in its up and down movements so that it will engage successive ones of the ratchet teeth 38 during each successive downward stroke of the oper-ating handle 54. These movements will be better understood from the _9_ 1 1581~3 following detailed description of the operation of the inven-tion.
Operation . . _ In the operation of the floor mounted conduit cutting device of the invention, th~ device is first securely mounted on a stable surface such as a floor. In this regard, the base 10 can be bolted or otherwise,suitably secured to the floor to assure adequate stabili-ty in the apparatus. A pair of jaw elements 44 is next selected for positioning in the jaw element cavities 40 and 42, according to the diametric size of -the synthetic resin tubular conduit or pipe which is to be cut using the device of the inven-tion. As previously explained, the arcuate inner peripheral edges of the jaw elements 44 are configured to mate with various diamet-rically sized conduits, so that complete support is given to the tubular element or conduit over approximately one-half of its entire periphery when it is placed in the jaw elements in the posi-tion illustrated in Figures 1 and 3.
With the selected jaw elements 44 pressed into the jaw element cavities 40 and 42, the cutting operation is then commenced. In undertaking the cutting of the conduit, -the operating handle 54 is grasped by its outer end (not shown), and is pivoted downwardly about the pivot pin 56. This causes the pawl lever 60 to undergo movement from a position typified by that shown in full lines in Figure 3 to that position which is illustrated in Figure 3 by dashed lines. In undergoing this movement, the dog 60b engages one of the ratchet teeth 38 and causes the blade element 30 to 1~58~53 pivot about the pivo-t pin 32. Such pivotal movement of the blade element 30 advances the straigllt cutting edge 56 toward the con-duit 52. The compression spring 35 mounted around the pivot pin 32 exerts a s,ufficiellt frictional force on the side of -the blade element 30 that it is retained in its advanced position at the end of the s,troke of the operating handle 54, and does not fall downwardly to its initial position.
As the operating handle 54 is retracted from its dashed line position of Figure 3 to -the full line position shown therein, the pawl lever 60 is also retracted so that the dog 60b moves down-wardly and -to the left as viewed in Figure 3. Upon recommencement of the downward stroke of -the operating handle 54, the indexing links 70 assure that the dog 60b will be guided upwardly and into the next succeeding ratchet tooth 38 to effect a further incre-mental pivotal movement of the blade element 30.
The described operation of the operating handle 54 is repeateda number of times until the straight cutting edge 36 is caused to shear through the tubular conduit 52. In this regard, it will be noted that the jaw elements 44 are spaced from each other so that the cutting edge 36 can pass completely through the tubular conduit 52. After the conduit has been severed by the cutting action of the blade element 30, the blade element can be pivoted back to its open position preparatory to another cutting operation. This is effected by lifting up on the operating handle 54 to move it to a position well above the solid line position in Figure 3. This 1 1~8153 movement will in turn cause the indexincJ links 70 and pin 72 to pull the blade element 30 througll a pivo-tal movement back to its starting position.
A modified embodiment of the conduit cutter apparatus of the invention is illustrated in Figures 10-17 of the drawings.
As this embodiment of the inven-tion is illustrated in Figures 10-17, it includes a two-part housing 80 made up of two side casting subassemblies 82 and 84 which are bolted together by means of bolts 86, 87 and 88. Each of the side plate casting subassemblies 82 and 84 includes a vertically extending side plate 90 having a base flange 92 projecting normal to the lower end thereof. A yusset web 9~ extends between each of the side plates 90 and the respective base flange 92 which extends there-from. Base flanges 92 project in opposite directions to form a supporting base for the cut-ter apparatus.
Each of the side plate casting subassemblies 82 and 84 further includes a horizontally extending, downwardly opening receiving channel 9G for receiving a measuring elemen-t used con-junctively with the cutter apparatus as hereinafter described.
It will be noted in referring to Figures 10-1~ that the hori-zontally extending, downwardly opening receiving channels 96 are each arcuately shaped to provide an opening in the bottom plane of each of the base flanges 92, and that the receiving channels are horizontally aligned when the two side plate casting subassemblies 82 and 84 are bolted to each other. It --1~--1 1~81~3 will be further noted in referring to I`igures 12 and 14 -that bosses 97 are formed on the facing sides of each of the two side plates 90, and in alignrment with each other, for the purpose of receivinc3 -the bolts 86 and 87 therethrough, and also to retain the side casting subassernblies 82 and 84 in proper spatial rela-tion -to each other. The downwardly opening receiving channels 96 are similarly formed to project in alignment with each other when the side plate subassemblies 82 and 84 are abutted. Finally, each of the side plates 90 includes a laterally projecting boss portion 89, and these boss portions are in alignment with each other and are abutted at the time that the side casting sub-assemblies 82 and 84 are bolted together for purposes of oper-ating the conduit cutter apparatus.
It will be noted in referring to Figures 10 and ll tha-t each of the base flanges 92 carries a pair of horizontally spaced, inwardly projecting U-shaped recesses 102 adjacent the laterally outer edges. The recesses 102 are provided to facilitate screwing or bolting the cutting apparatus t,o a table or the like, and also for the accommodation of locking bolts which are employed during the mode of operation in which the apparatus is extended horizon-tally along the floor in the manner hereinafter described. For the purpose of enabling a measuring element to be retained in a selected position within the downwardly opening receiving channels 96, a pair of wing nuts 104 are threaded through threaded aper--tures formed in the crest of each of the downwardly opening receiving channels 96 as shown in Figures 10 and 11.
At a time when the side casting subassemblies 82 and 84 are bolted toyether i.n their assembled relationship as shown in Figures 10 and 11, they clefine between thern a space 105 as shown in F'igures 13 and 14. The space 105 accommodates the operating mechanism oiE the embodiment of the conduit cutter apparatus shown in Figures 10-17. Such operating mechanism includes an elongated pawl lever 106 having an upturned toe portion 106a at an outer end thereof and located within the space 105. A large, plate-type blade element 108 is pivotally supported upon a pivot shaft 110 between a pair of protuberant lugs 90a which project from the two side plates 90. The blade element 108 is spring loaded by a com-pression spring (no-t shown) in the manner hereinbefore described.
The blade element 108 utilized in the embodiment of the in-vention illustrated in Figures 10-17 is similar to that depicted in the embodiment of the invention hereinbefore described.and illus-trated in Figures 1-9. The blade element 108, however, in-cludes a plurality of ra-tchet teeth 114 which extend around a major portion of its peripheral edge and cover about 190 of a circumference of a circle upon which the ratchet teeth are formed.
The blade element 108 further includes a tapered portion 116 which terminates in a straight cutting edge 118. A pair of overlapping arcuate slots 120 and 122 are formed through the blade element 108 at a location between the pivot shaft 110 and the ratchet teeth 114 and are concentric to each other and the pivot shaft. The slots 120 and 122 extend collectively over an arc of about 180 but are ar-ranged for individual, independent use in alternate modes of opera-tion of the condui-t cu-tter apparatus as hereinafter described.
1 1581!i3 ~ pair of parallel indexing links 128 and 130 are inter-conrlected at one end by a pivot pin 132 which extends through a slot 134 formed at the base of the upwardly turned dog 106b.
'l`he length of the slot 134 is such that the pivot pin 132 can move slidably within the slot over a short distance. ~t their ends opposite the ends connected by the pivot pin 132, the in-dexing links 128 and 130 are in-terconnected by a connecting pin 136 which extends between the ends of the links and through a selec-ted one of the arcuate slots 120 and 122. In the opera-tional mode of the cutter shown in Figures 10-14, the connecting pin 136 is shown extending through the arcuate slot 122. It will be noted in referring to Figure 12 that each of the indexing links 128 and 130 defines a small aperture 138 spaced inwardly in the link from the location of the connecting pin 132, and also defines an alternate aperture 135 spaced along the respective link from the apertures which receive the pivot pin 134 in the mode of assembly illustrated in Figure 12. The apertures 135 and 138 func-tion as an alterna-te site for extension of the pivot pin 134 and connecting pin 136, respectively, through the two indexing links at a time when the apparatus is used in the mode illustrated in Figures 15-17 as hereinafter described.
For the purpose of actuating the blade element 108 to cut through a conduit supported in arcuate recesses 140 formed in each of the side plates 90, a handle subassembly 142 is provided.
The handle subassembly 142 includes an arm 144 of substantially ll58153 rectangular cross-section. The arm 144 has a cross-sec-tionally U-shaped central portion 144a which is hollowed out to facilitate the reception of the upturned toe portion 106a of the pawl lever 106. The upturned toe portion 106a is connected to the arm 144 of the handle assemb]y by a pivot pin 146 projected through the two opposed~side portions of the arm 144. A second pivot pin 147 secures an inner end of the arm 144 between the side plates 90.
A spring 148 is turned about the pivot pin 146 and one end of the spring is inserted under and bears against a stop pin 150 passed through the arm 144. The other end of the spring hooks be-neath the lower edge of the pawl lever 106 in the manner shown in Figure 10. It will be noted in referring to Figure 10 that at a point spaced along the pawl lever 106 from the end thereof at which the upturned toe portion 106a is located, the pawl lever has an aperture 152 formed therethrough for a purpose hereinafter de-scribed. It will also be noted that the arm 144 of the handle as-sembly 142 has an alternate aperture 151 formed therethrough. The use of this alternate aperture will be hereinafter explained.
At the end of the arm 144 opposite its end which is secured between the side plates 90 by the use of the pivot pin 147, the arm is solid, as contrasted with hollowed or bifurcated, and car-ries a transversely extending latching key 106 which projects from the opposite sides of the arm. One of the projecting ends of the latching key 160 can be seen in Figure 10. A generally cylindrical or tubular handle extension 162 is engaged with the arm 144. In connecting the extension to the arm, the solid ]6-11581~3 end of the arm is inserted ln-to an opell elld of the handle exten-sion 162, passinc3 the latching key 160 along axially extending portions of L-shaped slots 164 formed in the opposite sides of the tubular ~andle extension. The handle extension is then rotated to cause the projecting ends of the transversely extend-ing latching key 160 to move into the circumferentially extending portions of the pair of L-shaped slots 164 located on opposite sides of the handle extension.
As will be hereinafter explained in detail, the embodiment of the invention depicted in Figures 10-17 is susceptible of use in a selected one of two different ways of operation. In the upright posi-tion, illustrated in Figures 10-14, the base flanges 92 are placed in flatly abutting contact with a work table or other supporting structure, and are secured in this position by means of bolts or other suitable hold-down devices extended through the inwardly projecting U-shaped recesses 102 and through the tabletop or other supporting su~face. A conduit is then placed in a position to be cut through by the blade element 108.
This position is within concavities 140 which are formed in the upper sides of each of the vertically extending side plates 90.
Cutting through the condui-t is then effected by downward recipro-cation of the halldle subassembly 142 in a series of strokes as hereinafter explailled in greater detail.
In order to permit the conduit which is -to be cut with -the cutter device in the r.lanner described to be measured to a precise 11581~i3 and selected length, a measuring device 170 is extended through the horizontally extending, downwardly openi.ng receiving channels 96 formed in each of the base flanges 92 so that an end portion of the measuring device projects laterally from at least one of the base flanges, and extends normal to the line of travel of the blade èlement 108 through the conduit. The measuring device 170 will generally have, as a portion thereof, a conduit stop plate 172 which projects normal to an elongated scale-carrying portion 174 of the device. In the use of the measuring device 170, one end of the conduit to be cut is abutted against the conduit stop plate 172.
To obtain an accurate reading of the scale carried on the graduated portion 174 of the measuring device 170, a blade stop shaft 180 is extended be-tween the side plates 90 at a location where the side plates are spaced near their upper ends to facili-tate passage of the cutting edge 118 of the blade between the side plates. The blade stop shaft 180 carries a hairline-type index marker 182. The measuring device 170 can then be shifted in the channels 96 until the desired length of conduit to be cut is seen as corresponding to -the appropriate indicia on the scale-carrying portion which is aligned with the index marker 182.
For the purpose of using the embodiment of the invention il-lustrated in Figures 10-16 in the alternate mode of utilization, a foot plate subassembly 186 is provided. The foot plate sub-assembly 186 includes a flat, horizontally extending base plate 1 1~8153 188 which is provided adjacent one edge -thereof with a pair of bolt holes 190 and 192. Projecting upwardly from, and normal to, the base plate 188 at the edge -thereof which is adjacent the bolt holes 190 and 192 is an abutment plate 194 which extends transversely across the width of the base plate. A pair of triangular reinforcing plates 196 and 198 are placed at the corners of the foot plate subassembly 186 to impart enhanced structural strength to the abutment plate 194.
Adjaoent the upper edge and at opposite ends of the trans-versely extending abutment pla-te 194, a pair of locking bosses 200 and 202 project normal to the plane of the abutment plate and ou-twardly tllerefrom on the side of the abutment plate which is opposite the side at which the base plate 188 is located. The position of the locking bosses 200 and 202 is such that when the base plate 188 is placed flat on the upper surface of a -table or other supporting structure, and the conduit cut-ter is turned on its side so that tlle straight side edges of the sicle plates 90 also flatly abut such surface, the abutment bosses 200 and 202 will project into, and register wit~, the horizontally extending, downwardly opening receiving channels 96 formed in the two base flanges 92. This relationship is best illustrated in Figures 15 and 17.
In order to provide for further interlocking of the base flanges 92 of the collduit cutter with the foot plate subassembly 186, the abu-tment plate 194 has a pair of threaded bolt openings 1 ~58153 206 formed therein in a position of alignment with the inwardly projectinc; U-shaped recesses 102 formed adjacent one edge of each of the base flanges 92. This facilitates the extension of bolts 208,1-~aving threaded shanks into the threaded bolt openings thus provided, with the heads of the bolts drawing the base flanges 92 tigll-tly against the abutment plate 194 in the manner best illustrated in Figures 15 and 16.
In the utilization of the embodiment of the invention il-lustrated in Figures 10-17, one mode of usage contemplates the placement of the conduit cutter device in an upright position in which the base flanges 92 flatly abut a supporting structure such as a table. Generally it will be desirable to bolt the structure to the table by placing the retention bolts in the inwardly pro-jecting U-shaped recesses 102 and tightening them down.
With tlle conduit cutter thus stabilized and anchored, the measuring device 170 may then be placed in position for utiliza-tion if desired. Where the measuring device 170 is to be used, the elongated scale carrying portion 174 thereof is passed through the aligned downwardly opening receiving channels 96 so that the scale carrying portion rests on the top of the table, and extends through the aligned receiving channels. The scale carrying portion 174 is then slid along the top of the table until the distance which separates the condui-t stop plate 172 and the plane in which the blade element 108 will move in cutting through a conduit is that which is indicated by a selected length ~2u~ 7 measuring indicia carried on the scale carrying portion then in vertical aliynment with the index marker 182 carried on the blade stop shaft 180. This is ascertained by visual sighting from above the st~ucture to obtain visual alignment of the index 5 marker 182 with the appropriate indicia forming a part of the scale on the scale carrying portion 172 of the measuring device 170. It will be understood that o-ther forms of length measure-ment of the conduit using the conduit stop plate 172 as the zero bench mark can also be employed.
Wi-th the measuring device 172 thus positioned, the wing nuts 104 are tightened down to assure that the measuring device will be retained in the proper position. ~fter -this, the conduit which is to be cut into a selected length inthose instances where the measuring device 170 is being utilized will be placed in the con-cavities 140 for~ed in the upper side edges of the side plates 90.
In most instances, the conduit stop plate 172 will have a suitable flange 173 or the like which will aid in holding the conduit in this position by supporting the free end of the conduit which is abutted against the conduit stop plate.
With the conduit so positioned and ready for cutting, and with the mechanism interconnected as illustrated in Figures 10-14, the handle subassembly 142 is next actuated by pushing down upon the tubular handle extension 162. The handle extension 162 has previously been interlocked with the arm 144 in the manner herein-before described. As the handle extension 162 is pivoted down-\
l 1581~3 wardly about the pivot pin 147, the elonyated pawl lever 106 is caused to move toward the right as the pawl lever is viewed in Figure 12. This movement, in conjunction with the guiding func-tion afforded by the connec-tion of the pawl lever 106 to the indexing links 128 and 130,causes the upwardly turned dog 106b of the pawl lever to enter the space between two of the ratchet teeth 114.
Continued downward movement of the handle subassembly 142 causes the dog 106b of the pawl lever 106 to push against the ratchet teeth 114 to cause the blade element 108 to undergo an increment of rotation abou-t the pivot shaft 110. This increment of rotation is completed upon the completion of the downward pivotal s-troke of the handle subassembly 142. The handle sub-assembly 142 is then raised up again to about the position illus-trated in Figures 10 and 12, or slightly higher, to retract the dog 106b from the ratchet teeth 114. At this time, the dog 106b is guided by the action of the indexing links 128 and 130 to a position where it is aligned with the next adjacent opening be-tween the next adjacent pair of ratchet teeth 114. Upon the next downward stroke of the handle subassembly 142, the previously described action is repeated, except that the dog 106b enters the opening between the next adjacent pair of ratchet teeth, and then pushes the blade element 108 through a further increment of ro-ta-tion.
Over a series of strokes of the handle subassembly 142 of the 1 1581~3 the type described, -the blade element 108 is advanced through an accumulative series of increments oE rotation so that the cutting edge 118 of the blade element is ultimately brought into contact with the outer periphery of the conduit resting in the concavities 140 formed in the upper side edges of the side plates 90. ,After this, several additional strokes of the handle subassembly 142 are carried out to cause the cuttiIIg edge 118 of the blade element 108 to be advanced through the conduit to shear it along a diametric plane. Ultimately, the conduit is sheared completely through, and the stop shaft 180 assures that no further advance of the blade will occur.
~t this time, the tubular halldle extension 162 is lifted upwardly to a positio. such that the handle subassembly 142 ex-tends u~wardly at a substantial angle from the substantially horizontal position illustrated in Figures 10 and 12. This action will cause the pawl lever 106 to be pulled toward the left as i-t is viewed in Figure 12, carrying with it the indexing links 128 and 130 which, at this time, are located so that the connecting pin 136 is very close to the trailing end of the slot 120. Re-traction of the indexing links toward the left will therefore cause the blade element 108 to be reversed in its direction of rotation and pulled back -to substantially its starting position.
The conduit cutter device embodiment illustrated in Figures 10-14 can be easily converted for use in the mode illustra-ted in Figures 15-17. In this manner of usage, the two-part housing 80 ~,c~
':
1 1~8153 is turned over on its side so that it rests upon the straight side edges of the s:ide plates 90 and upon the coplanar aligned edges of the base flanges 92. The pivot pin 147 is then removed to permit the arrn 144 -to be detached from the housing 80, and the tubular handle extension 162 is also disconnected from the arm by rotation.of -the handle extension to permit the latching key 160 to be slid outwardly through the axially extending portions of the L-shaped slots 164.
When these detachments have been effected, the arm 144 is 10 then manipulated to push the pawl lever 106 and the indexing links 128 and 130 connected thereto to the right through the space 105 between the ver-tically extending side plates 130 un-til the point of connection of the indexing links to the pawl lever is exposed on the right side of the housing 80 as it is viewed in 15 Figure 10. At this time the pawl lever can be disconnected from the two indexing links 128 and 130 by removal of the pivot pin 132. The pawl lever can then be withdrawn by pulling it out of the space 105 and to the left of the housing 80. The arm 144 of the handle subassembly 142 is then reconnected by extending the 20 pivot pin 147 through the openings 91 provided through the side plates 90 on the right side of the housing 80 as it is viewed in Figure 10 or, when the housi.rlg is turned on its side, near the top side of the housing as viewed in Figure 15. The arm 144 is then connected to the pawl lever 106 by extension of the pivot 25 E~in 146 through the alternate aperture 151 provided in the arm 144 and through the aper-ture 152 provided through -the pawl lever 106 at a point spaced downwardly along the lever from the up-turned toe portion 106.l. In this arrangement, the spring 1~8 is relocated to ex-tend between -the pawl lever and the solid portion S of the arm 144 in the manner shown in Figures 15 and 17. The upwardly tu~ned dog 106b of -the pawl lever 106 is then connected to the indexing links 128 and 130 (after they have been discon-nected from the blade by removal of the pin 136) by extension of the pivot pin 132 -through the alternate apertures 135 in each of the two indexing links and through the slot 134 formed in the dog. Finally, the connecting pin 136 is re-extended through the outer ends of the two indexing links 128 and 130 and through the slot 122 formed in the blade element 108.
With the conduit cutter device arranged in the described manner, the last step preparatory to using the device is to secure the foot plate subassembly 182 thereto. This is accomplished by initially placing the foot pla-te subassembly 186 immediately ad-jacent the base flanges 92 of the two-part housing 80 so that the locking boss 202 projects into the two horizontally extending, downwardly opening receiving channels 96 formed in each of the base flanges 92. At this time, the wing nuts 104 are substan-tially retracted so that mating registration of the boss 202 with the channels 96 can be effected. Finally, the bolts 208 are fit-ted into the threaded bolt openings 206 formed in the abutment plate 194 with the heads of the bol-ts bearing against the upper surfaces of the base flanges 92, and the shanks of the bolts .
l 15815~
passing through the inwardly projecting U-shaped recesses 102 in the manner illustrated in Figure 15.
With the conduit cutter apparatus -thus assembled, relatively large diametçr conduit can be cut through by laying it in the con-cavities 1~0 formed in the upper si.de edges of the side plates 90oE the two-part hoùsing 80. The operator then stands on the base plate 188 of the foot plate subassembly 186 to hold the apparatus stationary, and a-t this time manipulates the tubular handle exten~
sion 168 in a pivotal movement to actuate the blade element 108 in a series of incremental pivotal movements. The blade element is again caused to contact and shear through the conduit in the manner hereinbefore described. Alternately, the base plate 188 of the foot plate subassembly 182 can be bolted to the supporting structure by extending bolts through the bolt holes 190 and 192.
Although certain preferred embodiments of the invention have been herein described in order to illustrate the basic principles which u.nderlie the invention, i-t will be understood that various challc3es of structure can be made in the apparatus without depar-ture from such basic principles or alteration of the general mode of operation of the struc-ture. Changes and alterations of -this type are therefore deemed to be circumscribed by the spirit and scope of the invention except as the same may be necessarily limited by the appended claims or reasonable equivalents thereof.
What is claimed i5:
Claims (29)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A conduit cutting device comprising:
a base;
a housing having a side and secured to and pro-jecting upwardly from said base, said housing comprising:
a pair of opposed, substantially parallel vertically extending side plates separated by a vertically extending slot between the upper portions of the side plates, and defining a mechanism chamber between the lower portions of the side plates; and means interconnecting the side plates;
a blade element pivotally supported between the side plates movable in said slot, said blade including:
a plurality of ratchet teeth along a first side of said blade element;
a cutting edge along another side of said blade element spaced from said first side; and a slot through the blade element;
an operating handle pivotally connected to the housing at a location spaced from the pivotal axis of the blade element;
an operating mechanism interconnecting the operating handle with the blade element to pivot the blade element about its axis when said operating handle is pivoted about its pivotal axis, said operating mechanism including:
means for engaging said ratchet teeth in consecutive sequence upon repetitive pivotation of said operating handle; and indexing means connected between said engaging means and the slot in said blade element for alternately guiding said engaging means to a position of engagement be-tween two adjacent ratchet teeth upon pivotation of said operating handle in one direction, and then guiding said engaging means to a position of alignment with a different pair of adjacent ratchet teeth upon pivotation of said operating handle in a direction opposite said one direction of pivotation thereof; and means on said side plates for supporting a tubular conduit in a position to be cut through transversely by the cutting edge of said blade element when said blade is pivoted in one direction about its pivotal axis.
a base;
a housing having a side and secured to and pro-jecting upwardly from said base, said housing comprising:
a pair of opposed, substantially parallel vertically extending side plates separated by a vertically extending slot between the upper portions of the side plates, and defining a mechanism chamber between the lower portions of the side plates; and means interconnecting the side plates;
a blade element pivotally supported between the side plates movable in said slot, said blade including:
a plurality of ratchet teeth along a first side of said blade element;
a cutting edge along another side of said blade element spaced from said first side; and a slot through the blade element;
an operating handle pivotally connected to the housing at a location spaced from the pivotal axis of the blade element;
an operating mechanism interconnecting the operating handle with the blade element to pivot the blade element about its axis when said operating handle is pivoted about its pivotal axis, said operating mechanism including:
means for engaging said ratchet teeth in consecutive sequence upon repetitive pivotation of said operating handle; and indexing means connected between said engaging means and the slot in said blade element for alternately guiding said engaging means to a position of engagement be-tween two adjacent ratchet teeth upon pivotation of said operating handle in one direction, and then guiding said engaging means to a position of alignment with a different pair of adjacent ratchet teeth upon pivotation of said operating handle in a direction opposite said one direction of pivotation thereof; and means on said side plates for supporting a tubular conduit in a position to be cut through transversely by the cutting edge of said blade element when said blade is pivoted in one direction about its pivotal axis.
2. A conduit cutting device as defined in claim 1 wherein said engaging means comprises an elongated pawl lever having a first end connected to said operating handle;
a second end; and a dog formed on said lever at said second end.
a second end; and a dog formed on said lever at said second end.
3. A conduit cutting device as defined in claim 1 wherein said indexing means comprises a pair of substantially parallel indexing links each having one end pivotally con-nected to said engaging means and each having a second end operatively and movably connected to said slot for movement in a path following said slot.
4. A conduit cutting device as defined in claim 1 wherein each of said side plates is characterized in including a jaw element cavity, said jaw element cavities being aligned with each other; and wherein said means for supporting a tubular conduit comprises a pair of spaced, aligned conduit receiving jaws, each including a flange projecting into one of said cavities;
and an open concave inner surface.
and an open concave inner surface.
5. A conduit cutting device as defined in claim 2 and further characterized as including spring means connected to said operating handle for resiliently urging said operating handle in said opposite direction of pivotation after manual pivotation of said operating handle in said one direction.
6. A conduit cutting device as defined in claim 5 wherein each of said side plates is characterized in including a jaw element receiving cavity, said jaw element receiving cavities being aligned with each other; and wherein said means for supporting a tubular conduit comprises, a pair of spaced, aligned, conduit-receiving jaws each including a flange projecting into one of said cavities;
and an open concave inner surface.
and an open concave inner surface.
7. A conduit cutting device as defined in claim 6 wherein said indexing means comprises:
a pair of substantially parallel indexing links each having one end pivotally connected to said engaging means; and a pin interconnecting the other ends of said elongated, parallel, indexing links and extending through the slot in said blade element.
a pair of substantially parallel indexing links each having one end pivotally connected to said engaging means; and a pin interconnecting the other ends of said elongated, parallel, indexing links and extending through the slot in said blade element.
8. A conduit cutting device as defined in claim 1 wherein said means on said side plates for supporting a tubular conduit comprises a pair of concave edges defining a part of the upper ends of the side plates.
9. A conduit cutting device as defined in claim 1 wherein said device further comprises:
a second slot through said blade element and adapted for selective interconnection of said blade element with said operating handle through said operating mechanism; and means for selectively and alternately connecting said handle at two different locations to said housing, and in two different points of connection to said operating mechanism whereby said device can be operated in cutting conduit either when the device is supported upon the base or when the device is supported on a side of the housing.
a second slot through said blade element and adapted for selective interconnection of said blade element with said operating handle through said operating mechanism; and means for selectively and alternately connecting said handle at two different locations to said housing, and in two different points of connection to said operating mechanism whereby said device can be operated in cutting conduit either when the device is supported upon the base or when the device is supported on a side of the housing.
10. A conduit cutting device as defined in claim 1 wherein said housing includes a pair of identical side casting subassemblies each including one of said side plates, and each further including bosses projecting from the respective side plate in alignment with the bosses on the other of the side plates.
11. A conduit cutting device as defined in claim 1 wherein said base includes a pair of base flanges formed inte-grally with said side plates and each defining a horizontally extending receiving channel.
12. A conduit cutting device as defined in claim l and further characterized as including a foot plate subassembly connected to said base and having a base plate aligned with said side of said housing.
13. A conduit cutting device as defined in claim l wherein said operating handle comprises:
an arm having a first end pivotally connected to said housing and having a second end;
a latching key carried on the second end of the arm a handle extension detachably connected to the second end of the arm by means of said latching key; and means connecting a central portion of said arm to said operating mechanism.
an arm having a first end pivotally connected to said housing and having a second end;
a latching key carried on the second end of the arm a handle extension detachably connected to the second end of the arm by means of said latching key; and means connecting a central portion of said arm to said operating mechanism.
14. A conduit cutting device as defined in claim 11 and further characterized as including a measuring device com-prising:
an elongated scale-carrying portion positioned in said receiving channels; and a conduit stop plate secured to and projecting normal to said scale-carrying portion.
an elongated scale-carrying portion positioned in said receiving channels; and a conduit stop plate secured to and projecting normal to said scale-carrying portion.
15. A conduit cutting device as defined in claim 14 and further characterized as including means for retaining said measuring device at a selected position relative to the plane of cutting movement of said blade element.
16. A conduit cutting device as defined in claim 9 wherein said indexing means comprises:
a pair of substantially parallel, elongated indexing links;
means connecting one of the ends of each of said indexing links to said engaging means; and means for selectively and alternatively connecting the second ends of the indexing links to said blade element at a selected one of said slots through said blade element.
a pair of substantially parallel, elongated indexing links;
means connecting one of the ends of each of said indexing links to said engaging means; and means for selectively and alternatively connecting the second ends of the indexing links to said blade element at a selected one of said slots through said blade element.
17. A conduit cutting device as defined in claim 16 wherein said means on said side plates for supporting a tubular conduit comprises a pair of concave edges defining a part of the upper ends of the side plates.
18. A conduit cutting device as defined in claim 17 wherein said housing includes a pair of identical side casting subassemblies each including one of said side plates, and each further including bosses projecting from the respective side plate in alignment with the bosses on the other of the side plates.
19. A conduit cutting device as defined in claim 17 and further characterized as including a foot plate subassembly connected to said base and having a base plate aligned with said side of said housing.
20. A conduit cutting device as defined in claim 17 wherein said means for engaging said ratchet teeth comprises an elongated pawl lever having:
a first end connected to said operating handle;
a second end; and a dog formed on said lever at said second end.
a first end connected to said operating handle;
a second end; and a dog formed on said lever at said second end.
21. A conduit cutting device as defined in claim 1 wherein said supporting means comprises a pair of arcuate recesses formed in the upper sides of said side plates.
22. A conduit cutting device as defined in claim 1 wherein said blade further includes a second slot therethrough, said first-mentioned and said second slot being arcuate in configuration;
and wherein said cutting device further includes means on said housing for pivotally connecting said operating handle thereto at two alternate locations for pivotation about two spaced horizontal axes of pivotation to facilitate an alternate conduit cutting mode when said housing is placed on one side on a floor with said base extending vertically.
and wherein said cutting device further includes means on said housing for pivotally connecting said operating handle thereto at two alternate locations for pivotation about two spaced horizontal axes of pivotation to facilitate an alternate conduit cutting mode when said housing is placed on one side on a floor with said base extending vertically.
23. A conduit cutting device as defined in claim 22 wherein said base comprises a pair of coplanar base flanges each extending substantially normal to the plane of one of said side plates, and each defining a horizontally extending, downwardly opening receiving channel adapted for receiving a horizontally extending measuring element.
24. A conduit cutting device as defined in claim 23 and further characterized as including a hold-down subassembly including a horizontally extending tongue engageable with said receiving channels; and a friction plate extending substantially normal to the plane of said base flanges.
25. A conduit cutting device as defined in claim 1 wherein said operating handle comprises:
an arm of substantially rectangular cross-section having one end pivotally connected between said side plates, and having a second end;
a transversely extending latching key projecting from opposite sides of said arm at the second end thereof;
and a tubular handle extension having a J-slot in one end thereof for receiving and engaging said latching key to operatively interlock said arm and said handle extension.
an arm of substantially rectangular cross-section having one end pivotally connected between said side plates, and having a second end;
a transversely extending latching key projecting from opposite sides of said arm at the second end thereof;
and a tubular handle extension having a J-slot in one end thereof for receiving and engaging said latching key to operatively interlock said arm and said handle extension.
26. Apparatus for transversely shearing cylindrical plastic tubing comprising:
a blade element having a cutting edge and pivotally mounted for partial rotation about a pivotal axis and in a plane extending normal to the longitudinal axis of the tubing;
a base;
means pivotally supporting the blade element on the base;
tubing holding means detachably mounted on said blade element supporting means and including arcuate surfaces for directly engaging and supporting a tubing to be cut over sub-stantially 180° of the outer periphery of the tubing at contact areas spaced axially from each other along the tubing;
an operating handle movably supported over said base and connected thereto; and means interconnecting the operating handle and the blade element for incrementally pivoting the blade element when said operating handle is moved through a predetermined path relative to said base.
a blade element having a cutting edge and pivotally mounted for partial rotation about a pivotal axis and in a plane extending normal to the longitudinal axis of the tubing;
a base;
means pivotally supporting the blade element on the base;
tubing holding means detachably mounted on said blade element supporting means and including arcuate surfaces for directly engaging and supporting a tubing to be cut over sub-stantially 180° of the outer periphery of the tubing at contact areas spaced axially from each other along the tubing;
an operating handle movably supported over said base and connected thereto; and means interconnecting the operating handle and the blade element for incrementally pivoting the blade element when said operating handle is moved through a predetermined path relative to said base.
27. Apparatus as defined in claim 26 and further charac-terized as including:
a plurality of adjacent teeth secured to said blade element; and wherein said means interconnecting the operating handle and the blade element comprises:
a pawl lever having a first end connected to the operating handle and a second end; and indexing means connected between the pawl lever and blade element for guiding the second end of the pawl lever to positions of engagement with consecutive teeth upon each repetition of movement of said operating handle through said predetermined path.
a plurality of adjacent teeth secured to said blade element; and wherein said means interconnecting the operating handle and the blade element comprises:
a pawl lever having a first end connected to the operating handle and a second end; and indexing means connected between the pawl lever and blade element for guiding the second end of the pawl lever to positions of engagement with consecutive teeth upon each repetition of movement of said operating handle through said predetermined path.
28. Apparatus as defined in claim 26 wherein said means pivotally supporting the blade element on the base comprises a pair of side plates positioned on opposite sides of the blade element and defining a pair of jaw receiving cavities on oppo-site sides of said plane in which said blade element undergoes partial rotation; and herein said tubing holding means comprises a pair of jaw elements each detachably mounted in one of said jaw receiving cavities.
29. Apparatus as defined in claim 28 and further charac-terized as including:
a plurality of adjacent teeth secured to said blade element; and wherein said means interconnecting the operating handle and the blade element comprises:
a pawl lever having a first end connected to the operating handle and a second end; and indexing means connected between the pawl lever and blade element for guiding the second end of the pawl lever to positions of engagement with consecutive teeth upon each repetition of movement of said operating handle through said predetermined path.
a plurality of adjacent teeth secured to said blade element; and wherein said means interconnecting the operating handle and the blade element comprises:
a pawl lever having a first end connected to the operating handle and a second end; and indexing means connected between the pawl lever and blade element for guiding the second end of the pawl lever to positions of engagement with consecutive teeth upon each repetition of movement of said operating handle through said predetermined path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000377309A CA1158153A (en) | 1981-05-11 | 1981-05-11 | Floor or bench mounted conduit cutting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000377309A CA1158153A (en) | 1981-05-11 | 1981-05-11 | Floor or bench mounted conduit cutting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1158153A true CA1158153A (en) | 1983-12-06 |
Family
ID=4119930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000377309A Expired CA1158153A (en) | 1981-05-11 | 1981-05-11 | Floor or bench mounted conduit cutting device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1158153A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115008222A (en) * | 2022-04-29 | 2022-09-06 | 林亚新能源科技(句容)有限公司 | Positioning assembly for cutting distance ring for wind power gear box and using method of positioning assembly |
-
1981
- 1981-05-11 CA CA000377309A patent/CA1158153A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115008222A (en) * | 2022-04-29 | 2022-09-06 | 林亚新能源科技(句容)有限公司 | Positioning assembly for cutting distance ring for wind power gear box and using method of positioning assembly |
| CN115008222B (en) * | 2022-04-29 | 2024-04-09 | 林亚新能源科技(句容)有限公司 | Positioning assembly for distance ring cutting for wind power gear box and use method of positioning assembly |
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