JPH0538092Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a device main body that has a blade as a rotary blade, such as a road cutter device used for forming cutting lines on a concrete road surface. The present invention relates to a support structure for a blade cover in a cutter device that adjusts the depth of cut by tilting it in a plane perpendicular to the surface to be cut.

[Conventional technology]

A blade cover is installed in road cutter equipment to prevent chips from flying around and to reduce cutting noise.This blade cover is designed to ensure that the blade is in contact with the work surface so that it can perform its function well from the start of cutting. It is necessary to have a size that covers almost the entire blade when not in use, and it also needs to be installed in such a way that it does not interfere with the progress of cutting into the workpiece surface by the blade. For this reason, conventionally, as shown in FIGS. 9 and 10, the lower part of the blade cover has a bellows structure, and its support structure is designed to be removably engaged with the main body of the apparatus.

That is, the blade cover 70 includes an upper cover 72 that covers almost the upper half of the blade 20 fixed to the rotating shaft of the device main body 2, a lower cover 74, and a bellows part 76 fixed to the lower cover 74. , upper cover 70 and lower cover 7
4 is removably locked to the main body of the device. For installation, the lower cover 74 having the bellows part 76 is locked to the device main body part 2, and the upper cover 70 is attached to the upper part of the lower cover 74.
This is done by placing and fixing. Device main body part 2
is moved on the road surface E by the front wheels 4 and rear wheels 6, and rotated in a plane perpendicular to the road surface E about the rear wheel axis by a hydraulic cylinder (not shown) connected to the support arm 12 of the front wheel 4. This rotation adjusts the cutting depth of the blade 20 into the road surface E.

When the blade 20 is not in contact with the road surface E,
Since almost the entire blade 20 is covered by the extension of the bellows portion 76, it is possible to effectively prevent chips from scattering and reduce cutting noise from the start of cutting.
Furthermore, as the blade 20 advances in the cut, the contraction of the bellows portion 76 avoids any hindrance to the displacement of the blade 20. Further, although not shown, a vacuum mechanism is installed in the main body 2 of the device, and cutting waste from the blade 20 is removed through a hose 28.
It is designed to be sucked through.

[The problem that the idea aims to solve]

By the way, as mentioned above, by making the lower part of the blade cover have a bellows structure and removably locking it to the main body of the machine, the function of the blade cover can be maintained throughout the entire operation regardless of the displacement of the blade with respect to the workpiece surface. However, since the blade cover has a large number of parts, it is troublesome to assemble and remove it, and the support structure is held in a fixed state, so when the main body of the device is rotated to a non-cutting state, it is difficult to assemble and remove. , as shown in Fig. 10, the rear end of the bellows part tends to get caught, making it difficult to move the main body of the device when not cutting, and when sucking cutting debris, the bellows part, which does not have rigidity, tends to get caught inward. This leads to a reduction in the lifespan of the blade cover because it is easily sucked into the blade and cut by the blade.

[Means to solve the problem]

In order to solve the above-mentioned problems, this invention was designed to avoid the disadvantages of the bellows structure by supporting the blade cover so that it is always perpendicular to the workpiece surface. A cutter device in which the cutting depth of the blade into the workpiece surface can be adjusted by rotating a device main body section in a plane perpendicular to the workpiece surface, and adjusting the degree of inclination of the device main body section by this rotation. In the support structure for a blade cover that is attached and locked to the device main body in a state covering the blade, a support member is installed in the device main body so as to be always perpendicular to the surface to be cut, and the support member The blade cover is slidably installed on the blade cover.

Further, in this invention, a fitting piece that fits into the support member may be formed on the blade cover so that the blade cover can be slid.

Further, in this invention, a long hole may be formed in the support member, and a shaft piece that engages with the long hole may be formed in the blade cover so as to be slidable.

Further, in this invention, a depth scale indicating the cutting depth of the blade and a pointer thereof may be formed relative to each other on the device main body and the blade cover.

[Effect]

According to this invention, the blade cover is always supported perpendicularly to the surface to be cut by the support member held perpendicularly to the surface to be cut. In a non-cutting state where the blade is away from the surface to be cut, the blade cover slides downward under its own weight to cover the blade, and its bottom surface is parallel to the surface to be cut. When the blade makes a cut, the blade slides on the support member as the blade is displaced.

Further, according to this invention, the blade cover is fitted into the support member by the fitting piece and is slidably supported.

Further, according to this invention, the blade cover is engaged with the support member by the shaft piece through the elongated hole, and is slidably supported.

In addition, with this invention, the actual depth of cut of the blade can be known from the outside by the depth scale and its pointer formed relative to the main body of the device and the blade cover, as the blade cover slides. .

〔Example〕

1 to 3 show an embodiment of this invention, and the same parts as in the conventional example are designated by the same reference numerals.

A front wheel 4 and a rear wheel 6 are installed below the device body 2 so as to be movable on a road surface E, and a bar-shaped manual handle 8 is installed above. A hydraulic cylinder 10 is installed inside the device body 2, and the end of the telescopic rod 10a of the hydraulic cylinder 10 is connected to the rotation axis 14 of the support arm 12 of the front wheel 4 so as to rotate in synchronization with the support arm 12. It is connected to an installed inner support arm (not shown). For this reason,
The device main body 2 can be rotated in the direction of the arrow by the operation of a hydraulic cylinder 10 about a rotation shaft 16 of the rear wheel 6.

A rotary shaft 18 driven by an engine or the like is installed at the front lower part of the main body 2 of the device, and the rotary shaft 18 has rotary blades having cutting chips made of diamond sintered body at predetermined intervals on the outer circumference. A blade 20 is fixed. The blade 20 is covered by a blade cover 22, and the blade cover 22 is slidably installed on a flat support member 24 that is rotatably installed in the device main body 2 around the rotation axis 18. ing. The support member 24 is supported so as to be always perpendicular to the road surface E by a link mechanism 26 that is synchronized with the rotating shaft 14. The chips produced by the blade 20 are sucked through a hose 28 by a vacuum mechanism installed inside the main body 2 of the apparatus.

Around the rotating shaft 18, a support member 24 that supports the blade cover 22 in advance of the blade 20 and a collar 30 fixed to the support member 24 are attached to the device main body 2.
The collar 30 is rotatably fitted into a box 29 fixed to the collar 30, and the collar 30 is locked with a snap spring 31. The blade 20 has flanges 32,3 on both sides thereof.
4 is inserted into the small diameter portion 18b,
It is fixed with a nut 36.

The blade cover 22 includes a cover body 38 and a base member 40 fixed to the lower surface of the cover body 38. Tip 4 of base member 40
0a is formed with an upward slope so that it can move smoothly on the road surface E, and the rear end 40b is formed in a triangular shape so that the cutting line on the road surface E can be easily traced. Further, insertion ports 40c and 40d for the hose 28 are formed on the upper surface of the base member 40, and a sheet member 42 having a number of suction holes for a vacuum mechanism is fixed to the lower surface. Note that a space is provided between the base member 40 and the sheet member 42 to increase the suction force.

A guide hole 38a for the rotating shaft 18 is formed in the inner surface of the cover body 38, and the width thereof is formed to correspond to the outer shape of the collar 30. On both sides of the guide hole 38a in the cover body 38,
Fitting pieces 44, 4 having an L-shaped cross section for sliding the blade cover 22 with respect to the support member 24
6 is fixed, and the blade cover 22 is fitted and set from above the support member 24. A depth scale 48 indicating the depth of cut of the blade 20 is formed on the device body 2, and a pointer 49 is attached to the inner surface of the cover body 38 in correspondence with the depth scale 48. As a result, the approximate actual size value of the cutting depth of the blade 20 can be known from the outside, and the cutting depth can be easily adjusted. Depth scale 48
The pointer 49 may also be formed in the opposite manner. Further, a stopper 50 is fixed to the upper surface of the cover body 38, and this stopper 50 allows the blade cover 22 to be moved in a non-cutting state when the device body 2 is rotated and the blade 20 is separated from the road surface E. The lower limit position is determined. The blade cover 22 has a size that covers almost the entire blade 20 at the lower limit position. In addition, a through hole 38b is formed on the outer surface of the cover body 38 and has a size that allows the state of contact of the blade 20 with the road surface E to be observed from the outside, and defines the position of the blade 20 with respect to the cutting line on the road surface E. This allows for easy and accurate alignment. A receiving tray 52 for receiving dirty water is formed below the through hole 38b. Reference numeral 54 is a fixing piece for fixing the hose 28 to the blade cover 22. The link mechanism 26 supports the support arm 1 of the front wheel 4.
It consists of a link 56 that is integrally connected to the support member 2 and is rotationally driven by the hydraulic cylinder 10, and a link 58 that connects the link 56 and the support member 24.

Next, FIG. 4 shows the principle by which the support member 24 is always supported perpendicularly to the road surface E by the link mechanism 26.

The link 56 of the link mechanism 26 is
4 is indicated as r ₁ . The state in which the hydraulic cylinder 10 does not operate is the upper limit position of rotation of the device main body 2, and the state in which it moves to the maximum in the direction of the arrow is the lower limit position. θ and θ ₁ are determined by the maximum movement of the hydraulic cylinder 10. Therefore, the arc of r is l, and the arc of r ₁ is
By setting l=l ₁ , the support member r ₁ is always supported perpendicularly to _the road surface E between the upper limit position and the lower limit position of the device main body 2.

From the formula for calculating the arc length (l=πrθ°/180°), πrl/180°=πr ₁ θ ₁ /180°, r ₁ =θ/θ ₁ r , and r ₁ can be determined. Support member 2
4 is always supported vertically with respect to the road surface E, the blade cover 22 is also always supported vertically.

Therefore, at the upper limit position of the device body 2, the lower surface of the blade cover 22 is on the road surface E, as shown in FIG.
The machine is placed in a horizontal state with a fixed distance from the machine, allowing smooth movement when not cutting. As shown in FIG. 6, from the start of cutting, the blade cover 22
function can be demonstrated well. At this position, the pointer 49 indicates the minimum value on the depth scale 48. Further, as the blade 20 advances into the cut, the blade cover 22 slides on the support member 24, as shown in FIG. 7, so that the blade 20 alone can advance without any hindrance. Pointer 4 at the position where the depth of cut is maximum
9 indicates the maximum value of the depth scale 48.

In this way, the blade cover 22 is always supported vertically by the support member 24 by the link mechanism 26.
By configuring the blade cover 22 to be slidably installed, the blade cover 22 can have a simple integral structure. For this reason, attachment and detachment are easy, and workability can be improved, and weight and manufacturing costs can be reduced, and durability can be improved.

In this example, the link mechanism 26 is installed to hold the support member 24 vertically, but for example, an actuator such as a hydraulic cylinder or an air cylinder may be connected to the support member 24 to adjust the actuator to the inclination of the device main body 2. It may also be controlled to operate accordingly.

Next, FIG. 8 shows another embodiment of this invention, and parts overlapping with the previous embodiment are omitted.

The support member 24 is always held perpendicular to the surface to be cut by a link mechanism, an actuator, etc., as in the previous embodiment. A long hole 24a is formed in the support member 24, and a shaft piece 60 having a male thread is fixed to the cover body 38 of the blade cover 22 in correspondence with the long hole 24a. The blade cover 22 is slidably engaged with the support member 24 through the shaft piece 60 through the elongated hole 24a, and is prevented from coming off by a nut member 62 that is threaded onto the shaft piece 60.

[Effect of idea]

According to this invention, it is possible to avoid contact of the blade cover with the surface to be cut during movement in a non-cutting state, thereby improving safety. In addition, since the blade cover can be made into a simple integrated structure, it is possible to improve the workability of attaching and detaching the cover, reduce weight and production costs, and improve durability. be able to.

[Brief explanation of the drawing]

Fig. 1 is a side view of a cutter device according to an embodiment of the invention, Fig. 2 is a perspective view of the main part of the blade cover section, Fig. 3 is a schematic sectional view taken from the - line section in Fig. 1, and Fig. 4 is a side view of a cutter device according to an embodiment of the invention. The figure shows the principle that the support member is supported vertically, Figures 5 to 7 show the support state of the blade cover in response to rotational changes in the main body of the device, and Figure 8 shows another embodiment. A perspective view of a main part, and FIGS. 9 and 10 are schematic side views of a conventional cutter device. E...Work surface, 2...Device main body, 20...Blade, 22...Blade cover, 24...Support member, 24a...Long hole, 26...Link mechanism, 4
4, 46... Fitting piece, 48... Depth scale, 49...
...Pointer, 60...Shaft piece.

Claims (1)

[Claims for Utility Model Registration] (1) A device body having a blade as a rotary blade is rotated in a plane perpendicular to the surface to be cut, and the blade is adjusted by adjusting the degree of inclination of the device body due to this rotation. In a support structure for a blade cover that is attached to a cutter device that is capable of adjusting the depth of cut into a workpiece surface and is locked to the device main body in a state covering the blade, A support structure for a blade cover, characterized in that a support member is installed so that the blade cover is always vertical, and the blade cover is slidably installed on the support member. (2) A support structure for a blade cover according to claim 1, which is made slidable by forming a fitting piece on the blade cover that fits into the support member. (3) A support structure for a blade cover according to claim 1, wherein the support member is formed with a long hole, and the blade cover is formed with a shaft piece that engages with the long hole so that the blade cover can slide. (4) A support structure for a blade cover according to claim 1, wherein a depth scale indicating the cutting depth of the blade and an indicator thereof are formed relative to each other on the device main body and the blade cover.