JPH0429971Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement in the mounting structure around the drive shaft of a floor cutting device.

(Prior art) U.S. Patent No. 3376021 or Japanese Patent Application Laid-open No. 1983
Publication No. 87001 or Japanese Unexamined Patent Publication No. 102701/1987 is
A floor milling device of the type in which the device of the present invention can be used is disclosed.

Such cutting devices have a cutting blade supported by a head pivotally mounted to a frame. In these cutting devices, there is no protection for the drive pulley or drive rotor and the drive belt, so that contaminant particles or foreign matter can become trapped therein and cause failure; There were problems such as: it was difficult to access these parts; it was difficult and time-consuming to remove the vibrating part for driving the head;

(Problems to be Solved by the Invention) The present invention overcomes the drawbacks of the prior art as described above, protects the drive rotor and drive belt from surrounding contaminant particles, and protects the drive rotor and drive belt as well as the head and vibrating parts. The objective is to provide a structure that facilitates maintenance.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a frame 16 having side members 35a and 35b, wheels 12 for supporting the frame, and wheels for guiding the frame. a handle 29 and a head 3 pivotally attached to said frame;
A cutting blade 78 supported by a connecting element 91; said first and second tubular parts having mutually spaced apart and parallel axes;
The second tubular portion is pivotally connected to the head 38.

(b) Drive shaft 49; this drive shaft extends within the first tubular section 90 and has a rotor.

(c) Support bearings 48, 52; the support bearings are removably attached to the side members of the frame and rotatably support the ends of the drive shaft.

(d) a drive device supported by the frame; this drive device includes a motor 18 having a drive shaft 56;
It has a rotor 58 provided on the drive shaft.

(e) Infinite drive member 21: This infinite drive member connects the rotor 58 of the drive shaft and the rotor 54 of the drive shaft 46 to transmit the rotation of the drive shaft to the drive shaft.

(f) an opening 3 provided in the side member of the frame;
40; This opening accommodates the drive shaft 46, and a portion of its periphery is open, so that the support bearings 48, 5
2 from the side member, the drive shaft 46 can be passed through the open periphery of this aperture 340 to the outside of the aperture, so that the drive shaft 46 and the first tubular The portion 90 can be removed from the frame.

(g) a rotor 58 connected to the frame and of the drive shaft; a rotor 5 of the drive shaft;
4 and a protective shroud 400 covering the endless drive member 21; this protective shroud has a removable panel 400a, so that adjustment or repair of the rotor and the endless drive member can be carried out by removing this panel. It is made possible.

(Operations and Effects) In the above-described configuration, in particular, the side members 35a and 35b are provided with an opening 340 in which a portion of the periphery thereof is open, so that the drive shaft 46 can pass through the opening to the outside of the opening. By this, the drive shaft 46 and the first tubular part 9 accommodating it therein are
0 can be removed from the frame, and the rotor 58 of the drive shaft can be removed from the frame.
4 and the endless drive member 21, and a removable panel 400a is provided on this protective shroud to facilitate adjustment or repair of the coupling element 91, the head 38 or both rotors 54, 58 or the endless drive member. This makes it possible to do this easily.

(Example) Next, an example of the present invention will be described with reference to the drawings.

Referring first to FIGS. 1 and 2, a cutting machine incorporating the apparatus of the present invention is shown generally at 10. Attached to the cutting machine 10 are a pair of rubber tires 12, which allow the cutting machine 12 to be easily transported and maneuvered. Wheels or tires 12 are supported by wheels 14 passing behind the base frame 16. An electric motor 18 is attached to frame 16. The cutting machine 10 can also be driven by an internal combustion engine. Motor 18 is held in place by four mounting bolts 19 extending through slots 20 in frame 16. When the bolt 19 is loosened, the shape of the slot 20 allows the motor to be moved back and forth on the frame 16, thus adjusting the tension of the drive belt 21. Covering the motor 18 and attached to the frame 16 is a cover shroud 22. The shroud 22 slides over the side walls 23 of the frame and is held in place by bolts 24 as shown in FIG. A nose weight 25 is provided in front of the frame 16. The weight 25 is held in place by suitable wire clips 26 which secure the forward edge of the shroud 22 to the weight 25.
The weight applies a necessary load to the cutting edge 28, as will be described later.

The handle bar 29 has its lower end connected to the shroud 2.
a pair of elongate tubular members 30 attached to 2;
The upper end of the tubular member 30 is joined by tubular transverse members 31 and 32. The grip 33 is used to handle and maneuver the cutting machine 10.

Figures 3 to 5 show the cutting head subassembly 3.
6 is shown in detail. The aforementioned frame 16 is generally U-shaped having a horizontal web portion 34 and a pair of vertical flanges 35, best shown in FIG. Located between the flanges 35 at the forward end of the frame 16 is a cutting head 38. Head 38 is provided with a web 40 and a pair of flanges 42. The cutting head is pivotally mounted at its lower end to the frame 16 by a pin 44 passing through both pairs of flanges 35 and 42. Extending through and bearing the pair of flanges 35 is a rotatably mounted drive shaft 46 shown in FIGS. 4 and 6.
It is. Shaft 46 is journaled at its outer end in a pair of roller bearings 48 bolted to frame flange 35 by bolts 50. Locking the camshaft within the bearing 48 is a pair of locking sleeves 52 which are mounted on the shaft just outside the bearing 48. V is keyed to one end of the shaft 46.
A sheave 54 is adapted to support the belt. A sheave 58 similar to sheave 54 is provided on the shaft 56 of the motor 18, and these sheaves 54 and 58 are provided on the same rotation plane. The sheaves 54 and 58 are connected by a V-belt 21 made of rubber. The tension of V-belt 21 can be adjusted by the method described above.

The shaft 46 is connected to the first tubular part 9 of the connecting element 91
0, and the connecting element 91 also extends into the first
It has a second tubular portion 92 having a smaller diameter than the tubular portion 90 of. These tubular sections can advantageously and inexpensively be formed from steel tubular sections connected by steel plates 93 which are simply welded to the outer sides 94 and 95 as shown in FIG. . The cost of element 91 is therefore minimized.

Shaft 46 supports two axially spaced eccentrics 96 and 97. Referring to FIG. 7, the axis 96c of the eccentric portion 96 is aligned with the shaft 46.
It can be seen that it is separated from the axis 46a. Each eccentric is cylindrically shaped to rotate in a bearing, such as a bushing, designated 98 and 99, and is provided with a counterbore 98a in the pipe section.
and stepped shoulder 9 housed within and 99a.
8b and 99b are facing each other. The large space 100 thus formed between the eccentrics provides a reservoir for lubricating oil or grease,
As described below, when the shaft rotates, the first
Permanently lubricates the bearing part of the eccentric part which vibrates the tubular part 90 of and moves the element 91 back and forth. The shaft portion 46b extends between and connects the two eccentric portions.

The two eccentric parts are opposite ends, that is, end faces 9
6a and 97a, and note that the eccentric extent of these end faces acts to displace grease or oil as the eccentric rotates. This forces the grease radially outwardly and axially against the bushing, thereby facilitating lubrication of the eccentric and the bearing surface of the bushing. End faces 96 and 97
It should be noted that a crosses the axis of the shaft at an angle α of less than 90° on the outer surface of the eccentric. Grease is introduced into the space 100 via a grease joint 101 provided on the shaft portion 90.

At each end of the bearing are annular elastomeric seals 102 and 103, which are pressed into counterbores 102a and 103a in the shaft. These seals press against the eccentric portion of the shaft to prevent grease from leaking.

At the other end of the element 91 there is a bearing shaft 68 which is journalled in the tube section 92 via a bushing 66.
is provided. The shaft 68 also has the cutting blade 3
It is attached to 8. Rotation of shaft 56 causes element 91 to oscillate back and forth, causing head 38 to move back and forth relative to the axis of tube 44 in the direction indicated by arrow A in FIG.

At the lowermost part of the cutting head 38, the flange 4
2 is expanded and accommodates a cutting blade stand 70.
Platform 70 is adjustably held relative to the cutting head by a pair of bolts 72 and 74.
The bolt 72 passes through an opening 75 provided at the rear of the cutting blade base 70 and is screwed into both ends of the connecting rod shaft 58. Bolt 74 passes through opening 76 and is screwed into the end of shaft 77. The purpose of providing the cutting blade stand 70 is to firmly hold the cutting blade 78 in the cutting position. A pair of adjusting bolts 80 and a locking nut 81 are provided on the rear edge of the base 70, and these allow adjustment of the position of a cutting blade stop 82 for adjusting the amount of protrusion of the cutting blade. The front edge 83 of the cutting blade rest 70 is tapered to provide strong rigidity to the cutting blade and to allow a shallow angle between the cutting blade 78 and the floor to be cut. .

Figures 8, 10 and 11 show a modified cutting head 13 formed from a lightweight metal such as aluminum or its alloys or magnesium or its alloys.
8 is shown. The head has two elongated flanges 142 interconnected by a web 140. These flanges have two partially thickened ears 242 near the upper end of the flange. The ear portion 242 is connected to the pivot shaft 14
4 and has a bearing opening 150 for 4.
Pivot shaft 144 is connected to frame flange 135, which corresponds to flange 35 in FIG. Bearing opening (i.e. ear) must be at least 19mm long
have. Preferably, the length l is between 19 mm and 38 mm. As a result, wear of the head metal surrounding the opening 150 is prevented, especially in the case of excessive cutting forces.

The apertures are sized to closely accommodate the pivot axis 144 and define a common axis 144a. FIG. 11a shows another modification, in which the opening 150
It has a steel tube 344 which is housed in the shaft 144 and oppositely houses the shaft 144. The steel tube 344 distributes the load and prevents wear on the lightweight metal ears 242.

8 and 9 show the bottom side 138 of the head 138.
Deformed cutting blade holding plate 170 attached to a
It shows. The cutting blade 178 is clamped to the bottom side of the head by a retaining plate. two axes 1
77 and 168 extend parallel to web 140 through flange 142 to form axial projections 177a and 168a on the outer side of each flange. Both pairs of fixing members 200 and 20
1 extend parallel to each other through appropriate openings provided in the holding plate and the cutting blade at the end of each shaft. The fixing members have heads 200a and 201a, respectively, which clamp the split washers 202 and 203 against the bottom of the retaining plate. The fixing member also includes screw shafts 200b and 201.
b, and this screw shaft has a shaft protrusion 177a.
and 168a threaded opening 177b cage 168
It is screwed into b. Proper positioning of the cutting blade can therefore be performed with only one hand 210, as shown in FIG. That is, the cutting blade can be adjusted with the other hand 211 while operating the wrench 204 that accommodates the head of the fixing member.

The operation of the cutting machine 10 will vary depending on the floor surface to be cut. The larger the angle between the cutting blade 78 and the floor surface, the deeper the cutting blade cuts the floor surface. This angle can be changed by lifting the wheels 12 off the floor. This angle also allows the cutting blade 78 to be
It can also be changed by extending beyond the edge of 0. When cutting the floor surface of plywood or particle board, cut approximately further from the edge of the table 70.
It has been found to be very useful to use extra long cutting blades extending over 100 mm. Cutting blade 7
8 extends from the base 70, the angle between the cutting blade and the floor surface becomes smaller. The amount of weight 28 (load) applied to the cutting blade also varies depending on the floor surface to be cut. The weight can also be varied by the hand force applied to the handle bar 29. Generally speaking, the cutter will operate best if the handle bar 29 is raised until the wheels are approximately 12 mm off the floor. When cutting a particularly hard floor surface, it is very effective to use a cutting blade with teeth.

FIG. 12 is a cross-sectional view of a device similar to FIG. 10, with elements designated by the same reference numerals. The device of FIG.
They differ in that they have 1. The bushings can fit against stop shoulders 284 and 285 on the ears. Buttons are holes 282 and 2
annular materials 280a and 281a supported within metallic (e.g. bronze) sleeves 280b and 281b which are pressed and filled into 83;
This is advantageous because it is self-lubricating, which is provided by Materials 280a and 281a can be formed of molybdenum dioxide, for example. One such product is OILITE.
It is known as Butshiyu.

Pivot shaft 144 is typically steel and is housed in annular materials 280a and 281a for low friction, permanent, and low wear operation.

FIG. 13 shows a device similar to that of FIG. 4, with corresponding elements designated by the same reference numerals. This device differs from the device shown in FIG. 4 in that it includes a counterbalance device.
A counterbalance device is provided on the drive shaft 46 to reduce the vibrations created by the eccentric that rotates therewith and causes the head and cutting blade to vibrate. As shown, the counterbalance device includes two axially spaced weights 300 and 301 supported on shaft 46 at a position between the extensions of two eccentrics 96 and 97. In this way, the weight 300 is connected to the frame portion 35a and the shaft bearing 48.
a shield provided on the outer side of a and attached to the frame 35a at 304;
303 and is protected and confined.
Further, the weight 301 is provided on the outer side of the frame portion 35b and the shaft bearing 48b, and is protected and confined by a sheave 54. These weights can be attached to the shaft by keys or pins (see pin 305 shown in Figure 15).

In FIG. 15, weights 300a and 3
01a is an inner side portion of the frame members 35a and 35b, and is provided between the frame members and the other end portions 96a and 97a of the eccentric portions 96 and 97.
The metal weights, typically made of steel, are similar in size and shape and have a small thickness (typically less than 10 mm). Referring to FIG. 14, the eccentric portion represented by eccentric portion 97 projects in a direction perpendicular to axis 46a defined by the shaft (see arrow 310). weight 3
The weight represented by 00 projects in a substantially opposite direction perpendicular to axis 46a (see arrow 311), ie, in a second direction. Furthermore, the weight is 2
It protrudes over a larger range than the two eccentric parts protrude. These protrusion areas are designated P ₁ for the eccentric and P ₂ for the weight. The center of gravity C of the weight 300 exists outside the cross-sectional area of the shaft and the eccentric portion. The weight has a bell shape on the outside as shown. The two weights are approximately equally spaced from two identical eccentrics for best balance.

In accordance with the important aspects of the present invention, the 17th to 1st
Referring to Figure 9, the side members on the frame have an opening through which the ends of the drive shaft extend. These openings are circumferentially open and permit passage of the shaft to release the end of the shaft from the frame when the bearing is removed from the side member of the frame. This allows the drive shaft and first tubular section 90 to
can be easily removed from the frame. Complete removal from the frame is further facilitated by removal of the pivot 144 from the frame, freeing the second tubular section 92. This allows quick repair of the removed element, including replacement of the necessary belts 21 and bearings. This also eliminates the problem of how to remove the drive shaft from the frame, which is particularly useful when the drive shaft has eccentrics 96 and 97 along with weights 300a and 301a.

As shown in FIGS. 17-19, a side member of the frame, such as the side wall or flange 35a, has an opening 340. Preferably, the aperture extends through these walls or flanges. These openings are generally downwardly elongated (FIG. 19) and open outwardly at the periphery, such as at the flange or sidewall edge 341. This configuration allows bearing 48 to be attached to side flanges 35a and 35.
b and when facilitated by the downward rocking movement of the connecting element 91 about the axis 68, the ends of the axis 46 projecting into the aperture 340 move downwardly and open the aperture. Allow yourself to pass and be free. Note that aperture 340 extends approximately tangentially to a circle about the axis of shaft 68 in FIG. 18 to facilitate removal as described above. When the pivot shaft 44 is removed, the vibrating element is completely removed from the frame.

The configuration described above also includes shaft 44 and bearing 48.
to the side members of the frame, allowing the vibrating element to be quickly reconnected to the frame.

In FIG. 16, the set screw 370 of the weight 301a is pressed against the flat plate 371 of the shaft 46 for more secure locking of the weight.

Referring now to FIGS. 20 and 21, a protective shroud 400 is operatively connected to the frame. This connection is made at the weld 401 for the cover shroud 22 attached to the frame.
This is done at the welding section 402 for the frame. Shroud 400 is a sheave (element 5
4, 58 and 21 generally represent the rotor and endless drive member. ) extends around the sheaves 54 and 58 with the drive belt 21 attached to the sheaves 54 and 58. The shroud 400 extends from the upper sheave 58 to the lower sheave 54 and below the U-shaped opening 340 shown in FIG. However, the shroud can protect against external contaminants or dust approaching the sheave and belt.

Access to the belts and sheaves for repairs or adjustments etc. is provided by panel 400a which is part of the shroud.
This can be easily done by removing the
As shown in FIG. 21, the panel 400a is in the form of a cap whose edges are wrapped around a side wall 411 of the shroud at a point indicated at 410. Threaded fasteners 412 connect the caps with the aforementioned sidewalls and allow easy removal of the caps for access to the sheaves and belts.

In the modified shroud shown in FIG. 21, the panel 413 is made flat, and the screw fixing device 412 connects the outer periphery of the panel to the shroud side wall 41.
It is connected to the inner flange of 4.

In FIG. 13, the shroud 400 is located at the sheave 5.
4 and counterweight 301.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a floor cutting machine incorporating the device of the present invention, Fig. 2 is a plan view of the floor cutting machine shown in Fig. 1, and Fig. 3 is a line 3-3 in Fig. 4. 4 is an enlarged sectional view taken along line 4--4 of FIG. 3;
Figure 5 is a cross-sectional view taken along line 5--5 of Figure 3;
The figure is a sectional view along the connection structure shown in Figure 4,
The figure is a side view of the connection structure in Figure 6, Figure 8 is a side view, Figure 9 is a perspective view, Figure 10 is a front view showing the head part in Figure 8, and Figure 11 is the line in Figure 8. 11-1
Fig. 11a is a plan view similar to Fig. 11, Fig. 12 is a front view similar to Fig. 10 but showing another modification, and Fig. 13 uses a counterbalance weight. 14 is a side view of the drive shaft, eccentric portion, and weight, FIG. 15 is a sectional view similar to FIG. 6 showing the use of a counterbalance weight, and FIG. 16 is a sectional view similar to FIG. 17 and 18 are front views and sectional views similar to FIGS. 2 and 3, respectively, showing another modification; FIG. 19 is a side view of the modified frame side wall; FIG. The drawing is a side view similar to Fig. 1 showing another modification, and Fig. 21 is a line 21-- of Fig. 20.
22 is a sectional view similar to FIG. 21 showing still another modification. 10...floor cutting device, 12...wheels, 14...
...Axle, 16...Foundation frame, 18...Motor, 21...Belt, 22...Shroud, 28
... Cutting edge, 29 ... Handlebar, 34,
40...Web, 35, 42...Flange, 46
... Drive shaft, 48 ... Bearing, 54,
58... Sheave, 56... Drive shaft, 90, 92...
... tubular part, 91 ... connection element, 93 ... plate, 98, 99 ... bush, 100 ... space,
102a, 103a, 102, 103...spot holes.

Claims (1)

[Claims for Utility Model Registration] 1. A frame 16 having a side member 23, a drive source 18 supported by the frame 16, wheels 12 supporting the frame 16, and a handle 29 for guiding the frame 16. and a cutting blade 78 carried by a head 38 pivotally mounted to the frame 16, the apparatus comprising: (a) first and second tubular sections; 90, 92, said first and second tubular portions 90, 92 having mutually spaced apart and parallel axes, said second tubular portion 92 being connected to said head 38; (b) a drive shaft 46 which is pivotally connected to the eccentric means 9;
6,97, and the first annular portion 90
The eccentric means 96, 97 extend inside the eccentric means 96, 97.
bearing means 98 within said first tubular portion 90;
99, said shaft 46 is operatively connectable to a drive source 18 rotating it, and when said eccentric means 96, 97 are rotated by said shaft 46 said first
the tubular portion 90, the head 38 and the blade 7
drive shaft 46 imparting an oscillatory motion to 8;
(c) a support bearing 48 that is removably attached to the side member 23 of the frame and rotatably supports both ends of the drive shaft 46; and (d) the frame. is an opening 340 provided in the side member 23 of the invention, which accommodates the drive shaft 46 and has a portion of its periphery open, so that when the support bearing 48 is removed from the side member 23, , the drive shaft 46 is inserted into this opening 340.
opening 340 through said open periphery of
(e) an opening 340 adapted to allow passage to the exterior of the drive shaft 46 and the first tubular portion 90 from the frame 16; A motor 18 having a driven shaft 56, pulleys 58, 54 removably attached to the driven shaft 56 and the drive shaft 46, and these pulleys 58,
(f) a drive source 18 having an endless drive belt 21 running around the pulleys 58, 54 and the drive belt 21;
The protective shroud 22 covers the drive belt 22 and has a removable panel 400 so that adjustment or repair of the pulleys 58, 54 and the endless drive belt 21 can be carried out by removing this panel. (g) a counterbalance device 300 mounted on and rotating with the drive shaft 46 and for reducing vibrations created by said vibrations;
301, said eccentric devices 96, 97 comprising two axially spaced eccentrics 96, 97.
A lubricating oil storage space 100 is provided between the eccentric parts 96 and 97, and the counterbalance devices 300 and 301
are two weights 30 spaced apart in the axial direction and supported by the drive shaft 46 at a position between which the eccentric portions 96 and 97 extend.
0,301, and the counterbalance weights 300, 301 are connected to the opening 3.
40 and the eccentric parts 96, 97, the opening 340 is U-shaped and provided in the side member 23 of the frame, and the shroud 22 is provided between the U-shaped opening 34.
0, the eccentric portion protrudes in a direction perpendicular to the axis defined by the drive shaft 46, and the eccentric portion extends downward from the weights 300, 3.
01 protrudes in a direction substantially opposite to the direction perpendicular to the drive shaft 46, that is, in a second direction, and furthermore, the weights 300, 30
(h) said panel is defined by a shroud cap 400a extending in opposed relation to said pulleys 58, 54 and endless belt; The cap is connected to the pulley 58,
54 and a fastener 41 to the shroud structure extending around the endless belt 21.
A floor cutting device characterized in that the device is locked at 2. 2. The floor cutting device according to claim 1 of the utility model registration claim, wherein the head is made of a lightweight metal,
having flanges connected to each other by a web and partially thickened to form two ears, for a drive shaft received and supported in said ears and removably connected to said frame; A floor cutting device characterized in that the bearing defines an opening and includes a bearing bush adapted to be self-lubricating near said shaft. 3 Utility model registration The floor cutting device according to claim 2, further comprising a cutting blade holding plate attached to the head at the bottom side thereof, and a cutting blade holding plate extending parallel to the head web and penetrating the head flange. two shafts providing shaft projections outwardly of said flanges; and a fixture having threads passing through said retaining plate and into threaded engagement with threaded openings in said shaft projections; includes,
A floor cutting device further characterized in that the fixture has a head that is provided under the holding plate and is rotated to tighten the cutting blade between the plate and the bottom side of the head. 4 Utility Model Registration Scope of Claim 3 The floor cutting device according to claim 3, characterized in that it has a cutting blade sandwiched between the drive device, wheels, handle, and holding plate. Device. 5 Utility Model Registration Scope of Claims 1. The floor cutting device according to claim 1, wherein the first and second tubular portions are comprised of pipe pieces having different outer diameters, and an intermediate connecting the pipe pieces is provided. A floor cutting device characterized by having a structure. 6. Utility Model Registration The floor cutting device according to claim 5, wherein the intermediate structure includes a plate welded to the pipe piece. 7 Utility Model Registration Scope of Claims 1. The floor cutting device according to claim 1, wherein the eccentric portion has mutually opposing end surfaces that extend radially outward and axially away from the space; A floor cutting device characterized in that the lubricating oil is forcibly guided to the bearing device in the first tubular portion. 8 Utility Model Registration Scope of Claim 7 In the floor cutting device according to claim 7, the end surface has an outer cylindrical surface defined by the eccentric portion at an angle smaller than 90° with respect to the axis. A floor milling device transversely transversely in a plane extending at α, said shaft supporting a counterweight attached to the shaft by a set screw engaging a flat surface.