DE2428068A1 - WATER FLUSHING DEVICE FOR STREET PAVING MACHINES - Google Patents

Description

Dr. Ing.Walter AJbitz
Dr. Dieter F. Morf
Dr. Hans-Α. Browns

■ «- *. * «-— * ... June 11, 1974

SC 1125

ENGELHARD MINERALS & CHEMICALS CORPORATION H3O Mountain Avenue, Murray Hill, N.J. 07974, V.St. A,

Water flushing device for street paving machines

The present invention relates to a water flushing device for washing the flocks of road paving machines. In particular, the Rinsing device for water for each individual coulter multi-blade arrangement of rotatable shares, which are arranged on a common shaft, and the slot arrangement the plaster slitting machine form, feed.

To improve traffic on wet pavement surfaces, such as roads and taxiways for airplanes, it is known to have shallow, parallel grooves in it Plaster to cut to the water drainage between the

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Pavement surface and the wheels from on the pavement surface to enable moving vehicles. The slitting of the plaster is usually done by special plastering machines, for example with the in US-PS No. 3 407 005 (Sims et al.) Disclosed pavement slitting machine, accomplished. Such road chasing machines usually have one on the pavement Wheeled frame carrying a cutting assembly for cutting grooves in the surface. the Cutting assembly may have a horizontal, rotatable cross shaft on which a number of parallel, rotatable Flocks are arranged at a certain distance from each other, which engage with the plaster come to cut gullies in it. The shares can consist of metal disks, which have a diameter approximately one foot and have grinding or cutting segments attached to the circumference of the disc such as those disclosed in U.S. Patent No. 3,376,673 to Metzger et al.

When using such a paving machine, it is essential to have a continuous flow of water to be provided for each of the shares in order to prevent the share from being overheated around the same during the cutting work to lubricate and around the abraded plaster material wash away. For this purpose there is usually a horizontal crossbar with spray nozzles in front of and next to the rotatable shares has been provided to ensure an uninterrupted flow of water towards the shares directing a number of spaced nozzles provided along the crossbar was·

Although the spray nozzle rod device has a widely

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Has found widespread use, it can sometimes prove unsatisfactory for a number of reasons. A major problem arises as a result of the misalignment of one or more of the spray nozzles. The machine's pavement cutting operation throws significant amounts of peeled, carved, and abraded paving material which often enters and clogs individual spray nozzles. In addition, the water supply source of the water to be sprayed, which can typically be circulating spray water or water that is taken from water supplies that are provided on the street side, can contain solid impurities in suspension which can clog the nozzles. As soon as a nozzle becomes clogged, the flow of water to the shares adjacent to the nozzles can be reduced to such an extent that the share overheats and the grinding segments separate from the cutting disc or are otherwise damaged. In such a case, the work of the paving machine must be interrupted, the coulter arrangement dismantled and the defective coulter replaced with a new one. The economic costs of such a breakdown of the spray nozzles are very high, both in terms of the loss of costly shares and the costly downtime due to the interruption ^{1 of} the paving-cutting work.

Another thing that arises when using spray nozzles The problem is that these nozzles are usually not arranged closer to one another for structural reasons can be, as in a pitch of approximately 3.81 cm to 5 cm (1 1/2 - 2 "). However, the distance at which the Pavement gutters to be cut usually require that the cutting blades be at a closer spacing

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are to be arranged from each other, such as a typical pitch at a distance of 1.90 cm (3/4 "), so that it is not possible to make each flock right in alignment with a spray nozzle assigned to it. In order to prevent the coulters, which are arranged between adjacent nozzles, from remaining without water flushing, is necessary, a very large flow rate or very high speed of the water flow through the nozzles to be provided, which leads to an unnecessary overconsumption of water. In addition, the spray nozzles don't just spray the shares, but also the space between the shares, which leads to further water loss. That The aim of the present invention is therefore to promote the economical use of water by every share individually supplied with their own amount of water that it requires and by the attachment of Water in the space between the coulters is avoided.

Another problem that arises when using spray nozzles is that a film of air, which has a tendency to stick to the circumferential edge of the rotating cutting part, coupled with the centrifugal action the rotating cutting blade, making it difficult to get water on the face of the circumferential edge to apply effectively with the cutting blade. The most effective application of water is therefore to the sides of the Cutting blade in the area next to the edge of the circumference, since water was found attached to it, then by centrifugal action on the cutting surface the cutting blade has been carried outwards. the However, use of spray nozzles is beneficial in applying water to the sides of each cutting blade as well as to the Lower edge of the circle comparatively ineffective.

The water flushing device according to the invention is

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right, water individually for each of the rotatable shares a pavement slitting machine without any possibility of clogging the water supply. By avoiding dislocation and by ensuring continuous uninterrupted Water flow to each share is the possibility of damage to individual shares due to overheating effectively eliminated, resulting in significant maintenance savings and costly downtime should be avoided during the plaster slit texts.

In addition, the water flushing device according to the invention works with greater economy in water consumption than facilities with spray nozzles, there the need for an upstream water supply to avoid inadequate water supply to certain flocks omitted and also the problem of the water supply to the empty space between the shares is eliminated. About that In addition, the water gets through the moistening of the side surfaces every flock on its circumference edge, like this that the water is guided directly to the circumferential cutting edge of the coulter by the centrifugal force, the water is fed to the coulters more efficiently.

The above desirable results are achieved by each flock with its separate individual water supply in contrast to the previously known facilities is provided, in which spray nozzles are used, which are arranged at a greater distance from each other than the distance between each cutting blade. To achieve this result, the A flushing device extending in the transverse direction

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Water pipe, which has a number of slot-like openings along its length in the same Distance, as the distance between the cutting blades has. Each opening is wide enough to accommodate one of your assigned cutting blades to be taken up loosely. The water pipe is through adjacent parts of the paver supported at a distance from the shaft that carries the coulter. The flocks jump through the slotted one Openings in front and extend partially into an inner passage which extends through the Water pipe extends through the middle. Pressurized water is introduced into the passageway in the spray nozzle rod fed and each of the shares individually through the openings allocated. Any solids, such as flaked or abraded plaster material, which during the Slitting of the plaster has been thrown up between a crowd and the edges of its associated Opening comes, is handled by the flock and removed before there is an obstruction to the flow of water becomes a flock »As a result, the possibility of an interruption in the flow of water becomes some flock avoided as a result of clogging, causing damage the flocks is largely reduced to a minimum as a result of overheating.

The water pipe is a rigid circular pipe made of plastic such as nylon, whereby the slotted openings are first formed by pressing the pipe against the cutting blades, so that these cut through the wall of the pipe and enter its interior. The depth of the cut is such that the circumference of each opening is only a smaller arc of the circular cross-section of the Represents Rohres. After the slotted openings

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have been cut, the water pipe is moved by the cutting blades a short distance, for example about 0.16 cm (1/16 ") moved radially away from the cutting edges to bring the flocks at a distance from the pipe and out of contact with it and a space for the To form water flow between the circumferential edge of each coulter and the pipe.

Each flock extends in the passage through the center of the passage at a distance of approximately l / H to 1/2 the inside diameter of the passage. The remaining cross-sectional area of the inner diameter of the pipe is not obstructed by the cutting blades, so that water along the inner passage to all Flocks can flow freely .. The water in the passage is on the edge of each Flock and also on the sides of the Flock brought next to their circumferential edge, so that some water through the centrifugal effect to the circumferential edge the crowd is taken away.

According to the invention, therefore, a water rinsing device is used for attachment to a plaster slitting machine with a Cutting blade assembly is provided which has a horizontal rotating shaft on which a number of parallel, rotatable shares' at a predetermined distance from each other are arranged. The water flushing device has a water pipe which has an inner passage and has a number of slot-like openings, which with communicate with the passage. The openings are arranged along the pipe at a distance from one another which corresponds to the predetermined distance between the shares, each opening being sufficiently large or wide to loosely accommodate one of the groups assigned to it, which are extend partially into the passage. The openings

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are first formed by moving the tube, which is made of a rigid plastic, against the blades so that they cut through the pipe wall.

The above and other advantages of the invention will be explained below with reference to the accompanying drawings described in more detail} show in it:

Fig. 1 is a side view of part of a cutting assembly of a pavement slitting machine a water flushing device, which accordingly a preferred embodiment of the invention is trained;

Figure 2 is a front view of the cutting assembly and water flushing device 1 in the direction indicated by arrow 2;

Fig. 3 is a side view in the large configuration; partially in cross section of the water flushing device shown in Fig. 1, with an initial step is illustrated in the construction of the water flushing device, the openings cut in a pipe which is part of the invention;

Fig. U is a side view of the water flushing device shown in Fig. 3, after the openings have been cut and the flushing device in its Working position has been fixed in the cutting assembly;

FIG. 5 is a perspective view of that shown in FIG

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Water pipes s;

Fig. 6 is an end view of a water flushing device, which corresponds to a second inventive Embodiment is formed;

FIG. 7 shows a cross-sectional or side view of part of the flushing device shown in FIG. 6 the line 7-7.

The water flushing device according to the present invention has a horizontal water pipe 10 (Fig. 1 and 2) which extends transversely to a plaster slitting machine, with parts of its. Frame generally with 12 are designated. The water pipe 10 distributes water individually to each cutting blade of a number of in the transverse direction spaced apart, identical cutting blades 14 mounted on a horizontal rotating shaft 16, which is mounted transversely in the frame 12. The water pipe 10 (Fig. 5) has a number of slot-like ones openings 18, which along its longitudinal extent in a Are arranged at a distance from each other, which corresponds to the distance between the cutting blades 14-, it being so arranged is (Fig. 4) that each cutting blade through an associated opening of the openings 18 partially in a passage protrudes through the center of the spray nozzle rod. Under Water under pressure is fed to the passage 20 so that when the cutting blade passes through the opening 18 extends therethrough, the circumferential edge and the adjacent side surfaces of the cutting blade into the Submerge water. Between the edge of the circle each

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Cutting blade and the upper and lower edges 24 and 26 of each opening 18 a space is provided, so that water is brought out with the blade in sufficient quantity to keep the blade in its place during its Cutting work to cool and lubricate and to wash away the sanded paving material.

It can be seen that in the construction described the possibility of an interruption of the water flow to a blade effectively eliminated as a result of clogging or interruption of the water supply will, there. any solids located between the blade and the edges of the associated opening 18 the blade will be swept away. Thus, it becomes a major cause of the cutter blade breakdown in the facilities eliminated according to the prior art.

Another important advantage is that the Water consumption is more effective than is the case with the spray nozzles, which are not in such close distance from each other how the cutting blades can be arranged. With the help of the individual openings 18 after present invention, water is supplied to each cutting blade separately so that no water loss as a result from splashing water in the space between the blades and no need for excessive water supply in certain areas to ensure that. the water reaches blades that are otherwise proportionate far away from the nearest spray nozzles, if nozzles are used.

In addition, * is the way in which water fed to the blades is more effective. Since each

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When the blade rotates rapidly, it is difficult to apply water directly to the circumferential edge surface of the blade due to the adhesion of an air layer to the circumferential edge and the action of centrifugal force. While each blade hindurchkonunt by their their associated opening 18, but adjacent the circular peripheral edge side of the blade surfaces are moistened by the water, the centrifugal force then drives the water to the circular peripheral edge by from Sen, to provide the desired lubrication and cooling to achieve the same.

In the preferred embodiment, the water rinsing device of the present invention is used in conjunction with a plaster slitting machine of the type disclosed in U.S. Pat. 3,407,005 (Sims, etc.) is disclosed, relevant portions thereof are indicative herein, can uerden although the Bespülungseinrichtung in connection with any other desired fluffing and paving slot machine used. The pavement slitting machine comprises a frame , of which the aforementioned parts 12 form a part which is supported on wheels for longitudinal movement in the forward direction along the pavement in which the gutters are to be cut. The shaft 16 is rotatably mounted in the frame 12, transversely to the same in a horizontal position, it being rotated by a drive unit 28 (FIG. 2) in the direction shown by the arrow in FIG. 1. The leading edge of each blade 14, fixed with the other blades on shaft 16 , is thus rotated downward and brought into contact with the underlying plaster to cut a groove therein.

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Each of the cutting edges IH has a circular steel disk which has a number of cutting segments attached to its circumference; the cutting segments have diamond particles embedded in a die. In the preferred embodiment, include the cutting blades of the type described in US-PS-No. 3,376,673 to Metzger et al., Although others are also disclosed known cutting blades can be used.

The water pipe 10 intersects the blades 14 in the lower front quadrant of the blades approximately in the center of this quadrant (Fig. 1). The openings 18 are in the upper rear quadrant of the water supply pipe, facing upwards. The water has only one short circumferential stretch from the water pipe to the attachment point of the cutting edges in engagement with the Put back the patch *. Although the position of the pipe with reference to a downward-cutting operation of the blades, it will be seen that for certain cutting purposes it is preferred to be an upward-cutting one To use working method in which the blades are in opposite directions relative to the driving movement Rotate direction, in which case the water pipe is located on the rear side of the blades.

Support for the pipe 10 is achieved by a support arrangement, generally designated 30 (Figs. 1 and 2) is indicated. The Stutζordnung has a crossbar 32 of an L-section, which is supported on the front, lower quadrant of the tube 10 and through at a distance from one another provided bolt 34 is attached thereto. The bolts extend through oblong ones in the transverse direction Slots 36 of the beam 32 therethrough, being tapped directly in the wall of the pipe 10. On his

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opposite transverse ends is the beam 32 attached to two horizontal, longitudinally extending arms 38. Before the bar 32 is each horizontal arm 38 by a vertical arm 40 with adjacent parts of the frame 12 by an upper one and a lower bolt connection 4-2 and 44, respectively.

Another important aspect of the invention can be seen in the method by which the WasserbeSpülungseinrichtung is produced. The tube 10 is made of rigid plastic and has one to be taken into account in relation to its overall diameter Wall thickness. In the preferred embodiment, the tube has a circular cross-section, wherein however, tubes with square, rectangular, triangular or other cross-sections can also be used can. In the preferred embodiment, a rigid nylon tube is used, although other materials can be used. such as polyvinyl or polyethylene can be used. The tube 10 is on the StutζanOrdnung 30 attached, which is initially connected to the frame 12 only by the upper bolt 42, the lower Bolt 44 is not yet brought into position, as shown in Fig. 3 with solid lines. At this time is the assembly 30 around the upper bolt towards the cutting blade in a generally radial manner Freely pivotable inwardly with respect to shaft 16.

As the cutting blades 14 rotate, the assembly 30 is pivoted rearwardly around the tube 10 in a radial inward direction with respect to shaft 16 and in contact with the cutting blades so that they cut their way through the pipe walls and into

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the inner passage 20 enter. The inward pivoting movement continues until the outermost part joins the circumferential edge of each cutting edge in one Position inward of the passage 20 is between 1/4 and 1/2 of the inside diameter of the passage. At this point in time, the circumference of each opening 18 only forms a smaller arc of the circumference of the circle Cross section of the pipe. Another inward pivoting of the linkage assembly about 'the bolt 42 over this point is also prevented by the loading of the upper arm 40 against a shoulder 46, the is attached to the frame 12, as shown in Fig. 3 with dashed lines. The connection arrangement will then pivoted backwards by a smaller part of their movement to a position in which the lower Bolts 34 can be inserted and fastened as in Fig. 4 shown. The limited rearward movement holds the upper and lower edges 24 and 26, respectively, of the opening 18, which is cut by the blade in the pipe wall, at a distance away from the cutting edge, to give a clearance or to leave a space of approximately 0.16 cm (1/16 ") in the preferred embodiment. The position of the However, stop 46 can be changed so that different clearances can be provided. As a result the abrasive nature of the segments of the cutting blades and Moreover, with some side play in movement, the side surfaces of each segment support the neighboring ones Side surfaces of the associated opening 18 sufficiently so that the blade is loosely received in the opening will. This also allows some water between the side surface of the blade and the neighboring ones Side edges of the opening run.

Water is fed to the passage 20 in the pipe 10 by water

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supply pipes 48 (Fig. 2) supplied, which are connected to the transverse axial ends of the tube 10 with threads extending inwardly therefrom (Fig. 2).

In another embodiment of the invention, the is shown in Fig. 6, the transverse axial ends of the tube 10 are closed with plugs, the Water the passage 20 through a number of transversely spaced apart water supply hoses 50 flows through, which have horizontally arranged threaded connections, which in the supply pipe at his enter radially opposite the side opposite the cutting blade.

In summary, it can be stated that the water flushing device according to the invention every cutting blade provides a single water supply which cannot be interrupted due to a blockage. As a result, there is a possibility of blade breakdown due to overheating due to an interrupted Effectively eliminated water flow.

Another advantage is that the available water is used more efficiently than with a comparable device is the case in which spray nozzles are used, since the water is not in the Space between the blades is sprayed and since there is no need to over-spray certain areas, to ensure that blades that are far away from the spray nozzles do not remain without water supply .. In addition, the water supplied to the blades is extremely effective on the circumferential edge of each blade.

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by ensuring that the sides of the blade adjacent to the circumferential edge are also in the water to be immersed.

The manufacture of the tube, in which it is pressed against the blades, to produce the slot-like Cutting openings in it is a much simpler form of manufacture than the one that machined Spray nozzles and formed along a spray nozzle rod at a predetermined distance from each other to be ordered.

Although the present invention has been described with reference to certain preferred embodiments, it is understood by those skilled in the art that various modifications and alterations are possible within the scope of the invention.

For example, a water rinsing device can be installed in a Cutting assembly can be used, which has only a single cutting blade on the rotating shaft.

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Claims (1)

SC 1125 Patent claims Water flushing device for attachment to a Pavement slitting machine with a cutting assembly, which has a rotating shaft on which a number of parallel, rotatable cutting blades are arranged at a predetermined distance from each other, the blades with the pavement come into engagement to cut grooves therein indicated by a water pipe having a tubular wall with at least one enclosed inner passage extending in a direction axially to the pipe wall, a number of slot-like openings which extend through extending the tubular wall and communicating with the passage in communication with the openings along of the tubular wall are spaced from each other by the predetermined distance corresponds to the cutting blades and each opening has a sufficient width to accommodate an associated one Cutting blade to be taken up loosely, and by a support device which is connected to the plaster cutting machine can be connected to support the water pipe parallel to the rotating shaft at a distance from the same, wherein the cutting blades move through the associated opening - 17 - 409882/0850 SC 1125 genes in the tubular wall extend partially into said passage. 2 · water flushing device according to claim 1, characterized characterized in that adjacent parts of the tubular wall containing said openings delimit, are designed so that parallel to the circumferential edges of the associated cutting edges these extend and are spaced apart so that they make contact between the This excludes edges. 3 »water flushing device according to claim 1, characterized characterized in that the water pipe is made of rigid plastic, and that said openings be formed by moving the tubular wall radially against the cutting blades to effect that the blades cut through the tubular wall and partially into said passage extend into it. Water flushing device according to claim 2, characterized in that the tubular wall is circular Cross-section and that the circumference of each opening is only a smaller arc of the circular Cross-section forms. 5 »water flushing device according to claim 2, marked - 18 409882/0850 SC 1125 characterized by a water device which is connected to the tubular wall in order to to supply standing water to the inner passage. Water flushing device according to claim 5, characterized in that said water device has at least one water supply pipe connected to an axial end of the tubular Wall is connected to deliver water axially to the inner passage. 7. water flushing device according to claim 5, characterized in that at least one water supply pipe, which is connected to the tubular wall between its ends to divert water in a radial, direction into the said passage to direct into. 8. water flushing device according to claim «+, characterized characterized in that each of said openings is in a generally upward direction towards the associated cutting blade is directed, said support means the water pipe in a vertical point below the horizontal diameter of the cutting blades. 9 »Spray unit according to claim H, characterized in that that the radially innermost part of each cutting blade relative to said inner passage extends therefrom - 19 409882/0860 SC 1125 extends inward to a position in the range 1/4 to 1/2 the diameter of said passage, 10. Fluid attachment device for attachment a cutting assembly with a rotating shaft on which a number of parallel, rotatable cutting blades in a predetermined distance from each other, characterized by a tube with a tubular Wall, with an enclosed internal passage extending in a direction axial to the tubular Wall extends a number of slot-like openings which extend through the tubular wall extend and come into communication with said passage, said openings along of the tubular wall at a distance from each other which is the predetermined distance of the Corresponding to cutting blades, and wherein each opening has a sufficient width or width to an associated To receive cutting edge loosely, and that a support device is provided, which with the cutting assembly can be connected to said tube parallel to the rotating shaft and at a distance from to support this, with the cutting edges extending through the associated openings in the tubular wall extend partially into said passage. 11. A paving slitting machine having a frame extending in a longitudinal direction, a wheel device - 20 409882/0850 SC 1125 which supports the frame for longitudinal movement along the pavement, and a cutting assembly by a horizontal, rotatable shaft arranged in said frame transversely to the same, a number rotatable cutting blades spaced transversely and in parallel along the rotating shaft are, wherein the cutting edges extend at their lower circumferential ends so that they are with the plaster come into contact with longitudinally extending grooves during movement of said To cut frame in it, a water flushing device, which is fixedly connected to the frame is, with a transversely extending tubular wall spaced from the rotating shaft and parallel is arranged to the same, a transversely extending enclosed internal passageway within the tubular wall, a number of transversely spaced apart, slot-like openings in the tubular wall, which with the Passage communicating, each opening in alignment with a cutting blade associated with it, and they loosely receives, which extends partially into said passage, and means for Supplying pressurized water to said passage. 12 »Plaster slitting machine according to claim 11, characterized in that adjacent parts of the tubular Wall which delimits said openings in the - 21 - \ 409882/0850 SC 1125 vertical plane are shaped so that they are
extend parallel to the circumferential edges of the associated cutting edges and are arranged at such a distance that they exclude contact between the edges. 13. Pf lasterschlitzmaschine-according to claim 11, characterized in that the water pipe made of rigid
Is made of plastic and that said openings are formed by said tubular
Wall is moved radially against the cutting blades to cause the blades to cut through the tubular wall and extend partially into said passage. IU. Plaster slitting machine according to claim 12, characterized in that characterized in that the tubular wall has a circular cross-section and that the circumference of each Opening only forms a smaller arc of the circular cross-section. 15. A plaster slitting machine according to claim 14, characterized in that the radially innermost part of each cutting blade relative to said inner passage extends inwardly therefrom to a position in the range of 1 / H to 1/2 the diameter of the passage, 16, method for producing a water flushing device - 22 - 409882 / Q85Ü SC 1125 direction for a visual arrangement, which one Forms part of a pavement slitting machine, the cutting assembly having a rotating shaft on which a number of spaced-apart, parallel, rotatable cutting blades are arranged, which engage the plaster to cut grooves therein, characterized in that a rigid tube made of abrasive material an axially extending internal passage spaced from and parallel to the rotating shaft is brought, in the direction of the shaft radially inward. the same is advanced until the pipe comes into contact with the cutting lines so that the feed of the pipe continues radially inward to cause the cutting blades to form a plurality of slot-like openings through the wall of the Cut the pipe until the blades partially enter the passage within the pipe that the The movement of the pipe radially inwards to the rotating shaft is terminated and the pipe is at the paving slit machine is attached, the slot-like openings accommodate the adjacent cutting blades, which partially extend into the passage through the tube. 17 »A method for producing a water flushing device according to claim 16, with an opposite the process step of fastening the pipe additional process step preceding the pavement slitting machine, characterized in that - 23 - 409882/0850 SC 1125 that the tube is moved a short distance radially outward with respect to the rotating shaft, which sufficient to the circumferential edge of the cutting blades except for the cutting contact with the wall of the pipe to. remove while allowing the cutting blades to partially close into the passage extend. 18. A method of manufacturing a spray unit according to claim 16, wherein a tube of circular cross-section is used, characterized in that the step of cutting the openings in a stage is ended in which the circumference of each slot-like opening is only a smaller arc of the circular cross-section of the tube. 19. The method according to claim 14, characterized in that that the internal passage in the pipe is connected to a supply of pressurized water. 20. Water flushing device for attachment to a A cutting assembly of a pavement slitting machine, the cutting assembly having a rotating shaft on which a number of parallel, rotatable cutting blades arranged at a predetermined distance from one another are, characterized in that the water flushing device has a tube which is arranged next to the rotating shaft parallel to this and - 2H 409882 / 085Ü SC 1125 that a number of openings are formed in said tube is for supplying water individually to each of the cutting blades and that means are provided which is connected to the pipe to supply water to all openings. 21. Fluid attachment device for attachment a cutting arrangement with a rotating shaft on which at least one rotatable cutting blade is arranged is characterized by a tube with a tubular wall with an enclosed Internal passage extending axially to the tubular wall, at least one slot-like opening, which extends through the tubular wall and in communication with said passage, said opening being of sufficient width or size to loosely receive the cutting edge, and by a support means which is connected to the Cutting assembly can be connected to the pipe at a distance from and parallel to the rotating shaft to trim, with the opening through said opening cutting blade extending into the tubular wall extends partially into said passage. - 25 - -409882 / G850