Circular saw cut-in type pipe cutting machine

Abstract

A circular saw cut-in pipe cutter includes a main housing, a drive mechanism disposed at least partially within the main housing, a saw blade operably coupled with the drive mechanism, and a slipper slidably coupled to the main housing. The slipper includes a tube container in which a tube may be received. The circular saw cut-in pipe cutter is adjustable between a cut-in state in which the main housing moves toward the slipper and the saw blade extends into the pipe container, and a retracted state in which the main housing moves away from the slipper and the saw blade does not extend into the pipe container.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 596,826, filed November 7, 2023, the entire contents of which are hereby incorporated by reference into the present application. TECHNICAL FIELD

[0003] The present utility model relates to a pipe cutting machine, and more particularly to a circular saw cut-in pipe cutting machine. BACKGROUND

[0004] Typically, during renovation or remodeling of houses, office buildings, and the like, it is necessary to cut water pipes in situ. This is difficult at best. As a result, the construction industry has been seeking new tools that can improve worker efficiency and work safety. SUMMARY

[0005] In one particular aspect, the present utility model provides a circular saw cut-in pipe cutting machine comprising:

[0006] a main housing;

[0007] a drive mechanism at least partially disposed within the main housing;

[0008] a saw blade operably coupled with the drive mechanism; and

[0009] a shoe slidably coupled to the main housing, wherein the shoe includes a pipe receptacle that can receive a pipe therein;

[0010] wherein the circular saw cut-in pipe cutting machine is adjustable between a cut-in state, in which the main housing is moved toward the shoe and the saw blade extends into the pipe receptacle, and a retracted state, in which the main housing is moved away from the shoe and the saw blade does not extend into the pipe receptacle.

[0011] In another aspect, the utility model provides a circular saw cut-in type pipe cutting machine, this circular saw cut-in type pipe cutting machine includes: main casing, this main casing has the guide plate with at least one guide collar; sliding shoe, this sliding shoe is slidably coupled to main casing, this sliding shoe can receive pipe, this sliding shoe has at least one guide pin is assembled into at least one guide collar to allow main casing and sliding shoe relative to each other slide;Saw blade movable relative to sliding shoe;And drive mechanism for driving saw blade at least partially arranged in main casing. Drive mechanism includes electric motor, be driven by electric motor bevel gear, include with bevel gear meshing bevel gear portion and be coupled to with bevel gear portion common rotation spur gear portion compound gear, and the spindle of installing saw blade. Spindle includes spindle gear and idler, idler is engaged with spur gear portion and spindle gear two, to transmit torque from compound gear to spindle. Motor defines with the plane of saw blade parallel motor axis, and spindle defines with motor axis vertical spindle axis, and the gear ratio between idler and spur gear portion is at least 5:1.

[0012] In another aspect, the utility model provides a circular saw cut-in type pipe cutting machine, it includes main casing, drive mechanism at least partially arranged in main casing, with drive mechanism operably coupled saw blade and slidably coupled to main casing sliding shoe. Sliding shoe includes sliding shoe casing assembled around the upper portion of main casing, first part is fixed relative to sliding shoe casing and second part is movable relative to sliding shoe casing between first state and second state, in first state, second part is aligned with first part, in second state, second part is misaligned with first part.

[0013] Other features and aspects of the utility model will become apparent from a careful reading of the detailed description and accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the perspective view of circular saw cut-in type pipe cutting machine.

[0015] Figure 2 It is Figure 1 The left view of circular saw cut-in type pipe cutting machine of

[0016] Figure 3 It is the left view of circular saw cut-in type pipe cutting machine of Figure 1 In the cut-in cutting state.

[0017] Figure 4 It is Figure 1 The top view of circular saw cut-in type pipe cutting machine of

[0018] Figure 5 It is Figure 1 The right view of circular saw cut-in type pipe cutting machine of Wherein saw blade protection assembly is in the open state.

[0019] Figure 6 yes Figure 1 A three-dimensional view of the drive mechanism of a circular saw-type pipe cutter.

[0020] Figure 7 yes Figure 6 A top view of the drive mechanism.

[0021] Figure 8 This is a three-dimensional view of another aspect of a circular saw-type pipe cutter.

[0022] Figure 9 This is a three-dimensional view of another aspect of the circular saw-type pipe cutter.

[0023] Figure 10 This is a three-dimensional view of another aspect of the circular saw-type pipe cutter.

[0024] Figure 11 This is a three-dimensional view of another aspect of a circular saw-type pipe cutter.

[0025] Figure 12 This is a three-dimensional view of another aspect of the circular saw-type pipe cutter.

[0026] Figure 13 This is a three-dimensional view of another aspect of the circular saw-type pipe cutter.

[0027] Before explaining any embodiment of this utility model in detail, it should be understood that the embodiments described herein are not limited in scope or application to the details of the configuration and arrangement of components described in the following description or as shown in the accompanying drawings. The device described herein can have other embodiments and can be implemented or realized in various ways. Furthermore, it should be understood that the wording and terminology used herein are for illustrative purposes and should not be considered restrictive. Detailed Implementation

[0028] like Figures 1-5As shown, the circular saw-type pipe cutter 100 includes a main housing 102 having a slipper 104 slidably mounted thereon. The slipper 104 includes a generally U-shaped pipe container 105 configured to mate around a pipe. Furthermore, the slipper 104 includes a slipper housing 106 configured to mate around and slide relative to the upper portion 108 of the main housing 102. A first guide pin 110 and a second guide pin 112 extend from the slipper 104 and are slidably mounted within corresponding guide collars 114, 116 extending from a guide plate 118. Each guide pin 110, 112 is surrounded by springs 120, 122 to bias the slipper 104 away from the guide plate 118, and consequently bias the slipper housing 106 away from the main housing 102. Each spring 120, 122 may be surrounded by a protective bellows (not shown) that expands and contracts as the slipper 104 moves relative to the main housing 102. The protective bellows prevents chips from the cutting operation from potentially contaminating the guide pins 110, 112 and guide collars 114, 116, and makes it difficult for the slipper 104 to slide relative to the main housing 102. Alternatively, each guide collar 114, 116 or guide plate 118 may include a grease fitting (e.g., a grease nozzle) leading to each guide pin 110, 112. Grease can thus be injected around each guide pin 110, 112 to remove any chips that have seeped into the interface between the guide pins 110, 112 and the guide collars 114, 116.

[0029] like Figure 3 As shown, when the main housing 102 slides into the slide shoe housing 106 towards the slide shoe 104 in the cutting direction 130, the circular saw blade 132 passes through the saw blade groove 134 formed by the lateral penetration of the slide shoe 104. Figure 1 This allows the user to place the slipper 104 around the pipe (not shown) and, while the saw blade 132 rotates, slowly move the main housing 102 toward the slipper 104 against the biasing force of the springs 120, 122, so that the saw blade 132 moves through the slipper 104 to perform a cutting operation on the pipe. Therefore, the circular saw-type pipe cutter 100 can move between a cutting-in state and a retracted state, in which the main housing 102 moves toward the slipper 104 and the saw blade 132 extends through the saw blade groove 134 in the slipper 104 into the pipe container 105; in the retracted state, the main housing 102 moves away from the slipper 104 and the saw blade 132 leaves the pipe container 105.

[0030] Figure 4The shoe 104 is shown to include a first portion 140 and a second portion 142. The first portion 140 is fixed relative to the shoe housing 106, and the second portion 142 is selectively movable relative to the shoe housing 106. The second portion 142 provides additional tube support to ensure straight cut tubes. The second portion 142 is movable between a first state, in which the second portion 142 is aligned with the first portion 140 of the shoe 104, as shown Figure 1 , and a second state, in which the second portion 142 is misaligned with the first portion 140. For example, the second portion 142 is rotated away from the first portion 140 about a pin 144, as shown Figure 4 , to store or to perform cutting operations in a confined space. It should be appreciated that the pin 144 can also be removed to allow the second portion 142 to be completely removed from the shoe 104. In another aspect, the second portion 142 can telescope into the first portion 140. As shown, the shoe 104 also includes an end plate 146 that includes an upper rail 148 and a lower rail 150 formed along a blade guard (discussed below). Figure 5 The end plate 146 and rails 148, 150 provide additional rigidity and stability to the shoe 104 and protect the blade guard from damage when the circular saw plunge pipe cutter 100 is dropped.

[0031] As shown Figure 5 , the circular saw plunge pipe cutter 100 also includes a blade guard 160 that fits around the blade 132 and very closely around the shoe 104 and slides relative to the shoe 104 during cutting operations. In particular, as the blade 132 is moved into the blade slot 134 in the shoe 104, the blade guard 160 moves with the blade 132. The blade guard 160 includes a fixed upper portion 162 and a rotating lower portion 164. Between the upper portion 162 and the lower portion 164 of the blade guard is formed a shoe slot 165 that is sized and shaped to fit closely around the outer circumference of the shoe 104. Figure 1 As shown, the rotating lower portion 164 rotates about a pin 166 that includes a threaded thumb lock 168 that is tightened to prevent the lower portion 164 from rotating during cutting operations. The thumb lock 168 is loosened to allow the lower portion 164 to rotate away from the fixed upper portion 162 to allow the blade 132 to be removed / replaced and to dump the cuttings collected in the blade guard 160 during cutting operations. The fixed upper portion 162 further includes a transparent portion 170 to facilitate alignment of the blade 132 with the cut line on the tube.

[0032] As shown Figures 1-5As further shown, the circular saw plunge pipe cutter 100 includes a lower housing portion 180 that includes a handle 182 with a trigger 184 and a battery receiver 186 configured to receive a removable battery pack 188. The battery pack 188 can be configured to have any of a variety of different voltages (e.g., 12, 14.4, 18, 24, 28 volts, etc.) and can also be configured to have any of a variety of different chemistries (e.g., lithium ion, nickel cadmium, nickel metal hydride, etc.).

[0033] Figure 6 and Figure 7 A drive mechanism 200 is shown disposed in the upper portion 108 of the main housing 102 and operably coupled to the saw blade 132 to drive the saw blade 132. The drive mechanism 200 includes a motor 202 that includes an output shaft 204. In particular aspects, the motor 202 is a brushless direct current (“BLDC”) motor. A bevel pinion 206 is mounted on the output shaft 204 and engages a compound gear 207 having a bevel gear portion 208 and a spur gear portion 210. The bevel gear portion 208 is driven by the bevel pinion 206, while the spur gear portion 210 of the compound gear 207 engages and drives a large idler 212. The large idler 212, in turn, engages and drives a small arbor gear 214 mounted on an arbor 216. The gear ratio between the bevel gear portion 208 and the bevel pinion 206 is greater than 2.5: 1 and less than or equal to 5: 1. More particularly, the gear ratio between the bevel gear portion 208 and the bevel pinion 206 is approximately 3.25: 1. The gear ratio between the large idler 212 and the spur gear portion 210 on the compound gear 207 is greater than or equal to 5: 1 and less than or equal to 7: 1. Further, the gear ratio between the large idler 212 and the spur gear portion 210 on the compound gear 207 is approximately 5.4: 1. The ratio between the small arbor gear 214 and the large idler 212 is greater than or equal to 0.25: 1 and less than or equal to 0.45: 1. In particular, the ratio between the small arbor gear 214 and the large idler gear 212 is approximately 0.32: 1.

[0034] The arbor 216 is mounted on a needle bearing 218. As shown, the output shaft 204 of the motor 202 defines or otherwise rotates about a motor axis 220 that is parallel to the plunge direction 130 of the circular saw plunge pipe cutter 300 Figure 3) or the plane of the saw blade 132. The arbor 216 defines an arbor axis 222 that is perpendicular to the motor axis 220 or that rotates about the arbor axis 222. This arrangement allows for a relatively slim profile of the circular saw plunge pipe cutter 100 with as small a saw blade as possible mounted on the circular saw plunge pipe cutter 100 for cutting one inch (1") IPS pipe. The bevel gear portion 208 accomplishes most of the gear reduction and torque amplification. The circular saw plunge pipe cutter 100 can also include a fan driven by the motor 202 to blow away cuttings from the pilot pins 110, 112 and the collars 114, 116 to prevent the cuttings from clogging or fouling the pilot pins 110, 112 and the collars 114, 116.

[0035] Figure 8 A circular saw plunge pipe cutter 300 is shown that illustrates another aspect, which includes a pipe clamp 302 rotatably and / or slidably disposed on a saw blade guard 304. For example, the pipe clamp 302 includes a sliding portion 306 that is biased outward by one or more springs 308 to cause a clamping portion 310 to further rotate about the pipe as the saw blade 312 moves into a saw blade slot 314 formed in a shoe 316 during a cutting operation.

[0036] Figure 9 A circular saw plunge pipe cutter 400 is shown that illustrates another aspect, which includes a pipe clamp 402 rotatably and / or slidably disposed on a shoe 404. For example, the pipe clamp 402 can rotate about the pipe and be locked in place via a lever 406. Thus, as the saw blade 408 moves into a saw blade slot 410 formed in the shoe 404 during a cutting operation, the pipe is held tightly in the shoe 404.

[0037] Figure 10 A circular saw plunge pipe cutter 500 is shown that illustrates another aspect, which includes a scissor pipe clamp 502 rotatably and / or slidably disposed on a shoe 504. For example, the clamping jaws of the scissor pipe clamp 502 can rotate about the pipe and be locked in place via a lever 506. Thus, as the saw blade 508 moves into a saw blade slot 510 formed in the shoe 504 during a cutting operation, the pipe is held tightly in the shoe 504. In another aspect, the scissor pipe clamp 502 can include a single clamping jaw mounted on a saw blade guard 512.

[0038] Figure 11A circular saw plunge pipe cutter 600 is shown that includes an over-center cam pipe clamp 602 rotatably and / or slidably disposed on a shoe 604. For example, as a pipe 606 moves into the shoe 604, the pipe 606 pushes against a lower portion 608 of the over-center cam pipe clamp 602, which causes the over-center cam pipe clamp 602 to rotate about the pipe 606 such that an upper portion 610 of the over-center cam pipe clamp 602 clamps the pipe 606 and holds the pipe 606 within the shoe 604. Thus, as a saw blade 612 moves into a saw blade slot 614 formed in the shoe 604 during a cutting operation, the pipe 606 is held tightly within the shoe 604.

[0039] Figure 12 A circular saw plunge pipe cutter 700 is shown that includes a pipe clamp 702 rotatably and / or slidably disposed on a shoe 704. The pipe clamp 702 includes a body 706 having a wedge 708 slidably disposed thereon. A spring 710 biases the wedge 708 toward the shoe 704. The pipe clamp 702 includes a locking lever 712 for locking and releasing the pipe clamp 702. For example, when the pipe clamp 702 is moved into a locked position adjacent the shoe 704, as shown, the circular saw plunge pipe cutter 700 moves against a pipe 714 to bias the wedge 708 toward the body 706 of the pipe clamp 702 until the pipe 714 clears the wedge 708 and the spring 710 biases the wedge 708 toward the shoe 704 to lock the pipe 714 within the shoe 704. Thus, as a saw blade 716 moves into a saw blade slot 718 formed in the shoe 704 during a cutting operation, the pipe 714 is held tightly within the shoe 704. Figure 12

[0040] Figure 13 A circular saw plunge pipe cutter 800 is shown that includes a pipe clamp 802 rotatably and / or slidably disposed on a shoe 804. For example, the pipe clamp 802 can rotate about a pipe 806 and be locked in place via a lever 808. Thus, as a saw blade 810 moves into a saw blade slot 812 formed in the shoe 804 during a cutting operation, the pipe 806 is held tightly within the shoe 804. The circular saw plunge pipe cutter 800 further includes an electromagnetic clamp 820 adjacent a wall 822 (e.g., a back wall or a bottom wall) of the shoe 804. The electromagnetic clamp 820 can be activated when the circular saw plunge pipe cutter 800 is powered on and deactivated when the circular saw plunge pipe cutter 800 is powered off. In another aspect, the electromagnetic clamp 820 can also be used to attract and hold ferromagnetic swarf. The electromagnetic clamp 820 can be turned off to release the ferromagnetic swarf.

[0041] The various features recited hereinabove are recited in the claims appended hereto.​

Claims

1. A circular saw plunge pipe cutting machine characterized by, comprising: a main housing; a drive mechanism disposed at least partially within the main housing; a saw blade operably coupled with the drive mechanism; and a shoe slidably coupled to the main housing, wherein the shoe includes a tube receptacle that can receive a tube therein; wherein the circular saw plunge tube cutter is adjustable between a plunged state in which the main housing is moved toward the shoe and the saw blade extends into the tube receptacle and a retracted state in which the main housing is moved away from the shoe and the saw blade does not extend into the tube receptacle. the main housing includes a guide plate disposed therein, and wherein the guide plate includes at least one guide collar.

2. The circular saw plunge pipe cutting machine of claim 1, wherein, the shoe includes at least one guide pin that fits into the at least one guide collar, and wherein the at least one guide pin allows the main housing and shoe to slide relative to each other.

3. The plunge-cut pipe cutter of claim 2, wherein, the shoe includes a shoe housing that fits around an upper portion of the main housing, and wherein the shoe housing slides over the upper portion of the main housing during a cutting operation.

4. The plunge-cut pipe cutter of claim 3, wherein, the shoe includes a first portion that is fixed and a second portion that is movable between a first state in which the second portion is aligned with the first portion and a second state in which the second portion is misaligned with the first portion.

5. The plunge-cut pipe cutter of claim 4, wherein, in the second state, the second portion rotates about a pin away from the first portion.

6. The plunge-cut pipe cutter of claim 5, wherein, in the second state, the second portion is removed from the shoe and moved away from the first portion.

7. The plunge-cut pipe cutter of claim 5 wherein, further comprising a saw blade guard mounted on the main housing about the saw blade.

8. The plunge-cut pipe cutter of claim 1, wherein, the saw blade guard includes an upper portion and a lower portion that rotates relative to the upper portion.

9. The plunge-cut pipe cutting machine of claim 8, wherein, the saw blade guard further includes a shoe slot formed between the upper and lower portions of the saw blade guard, and wherein the shoe slot is sized and shaped to fit closely around an outer periphery of the shoe.

10. The plunge-cut pipe cutting machine of claim 9, wherein, the shoe includes a saw blade slot adjacent to the tube receptacle.

11. The plunge-cut pipe cutting machine of claim 1, wherein, when the circular saw plunge tube cutter is in the plunged state, the saw blade extends through the saw blade slot and into the tube receptacle.

12. The plunge-cut pipe cutting machine of claim 11, wherein, ​

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