JP4237315B2 - Wall slit forming device - Google Patents

Abstract

A circular saw for masonry, has handles (11,13) provided respectively with an electrical on/off switch (12) and an electrical interlock switch (14), on a housing (10) containing a drive unit (20) and a partially enclosed cutting disc (50) which are pivotally linked (34) to the end of a sole plate (30) and kept apart under the action of a spring (36). A calibrated depth-scale arm (35), attached to the free end of the sole plate, allows the required depth to be preselected with an adjustable stop (33) movable along a probe rail (32) which in turn engages a mechanical cutout (15). In the event of the housing moving closer to the sole plate than the probe rail set-point allows, the cutout is rotated to deactivate the interlock switch via a push rod (16), and stop the saw.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a housing having two hand grips for forming a slit in the wall, the housing holding a drive unit for a slit forming tool constituted by at least one disk and for the carriage. And turnable around a bearing disposed in the first end region of the carriage against the spring force of the spring parallel to the disk plane of the slit forming tool, and in the second end region of the carriage, A lock rail protruding toward the housing and provided with an adjustable depth stop is provided, and the housing is provided with a detent that engages and interlocks with the lock rail and is rotatable. The present invention relates to a wall slit forming apparatus that can be operated by a lock switch provided on the hand grip.
[0002]
In particular, in order to lay the electric pipe in the wall formed by the new construction or the extension, a housing groove is required, and the electric pipe can be arranged in the housing groove so as to be orthogonal to the outer surface of the wall structure. In order to form such an accommodation groove, a wall slit forming device is used, and at least two slits extending in parallel with each other in the wall structure are cut. The area of the wall structure extending between these slits is excavated from the wall structure with a suitable tool. The depth of the slit and the distance between the slits are based on the required dimensions of the receiving groove to be formed.
[0003]
[Prior art]
German Patent Publication No. 19511725 describes a wall slit forming device having a carriage and a housing rotatably connected to the carriage. This wall slit forming device can be fixed to a depth stop during the slit forming operation, and this depth stop can be adjusted along a lock rail protruding from the carriage toward the housing. By this fixing, floating from the depth stop of the housing or fluctuation of the inclination of the housing with respect to the carriage can be avoided, thereby forming a slit having a constant depth.
[0004]
To secure the housing to the carriage is carried out by lock switch that can lock the rotation, the locking switch includes a detent disposed in the housing, by a lock arm for cooperative operation engaged with the detent Constitute. This locking arm is part of the depth side and projects in the direction of the housing. When the lock switch is in the release position with respect to the lock rail, the lock arm can be connected by a shape lock to a detent arranged rotatably in the housing.
[0005]
[Problems to be solved by the invention]
However, the depth stop of the housing is fixed, and the depth stop for the lock rail is adjustable, so that the depth stop that the preselected slit depth fluctuates due to improper processing in the wall slit formation. Risk of adjustment.
[0006]
Accordingly, an object of the present invention is to obtain a wall slit forming apparatus that can operate safely and easily without fluctuation of a preselected slit depth by operating a lock switch during slit formation.
[0007]
[Means for Solving the Problems]
In order to achieve this object, the wall slit forming device of the present invention is provided with a lock arm that engages with the lock rail and operates in a linked manner on the housing, and presses the lock arm against the lock rail in a locked state. A spring portion is provided, and the detent is provided with a control curved surface that engages with and engages with the lock arm .
[0008]
When the housing is fixed directly to the lock rail of the carriage, the housing and the carriage do not rotate relative to each other as long as the lock switch is operated.
[0009]
In order to reliably and quickly fix the housing to the lock rail, the lock arm is provided with at least one protrusion, and the protrusion can be fixed to the cut portion of the lock rail by a shape lock. .
[0010]
The cut part of the lock rail is constituted by, for example, a notched region, and a plurality of teeth are arranged in the longitudinal direction of the lock rail. The protruding part of the lock arm is cut off by turning the housing relative to the lock rail, on the one hand into the lock rail cutting part or the space between the teeth, and on the other hand by cutting the housing in the direction of the carriage. In order to be able to slip out from the portion and slide on the teeth, the protruding portion is provided with a stop surface on the side opposite to the carriage and a guide surface on the side facing the carriage. It is preferable that the surface is extended in a direction perpendicular to the length direction of the lock rail and the guide surface is inclined toward the stop surface toward the free end of the protruding portion.
[0011]
In order to avoid contamination of the lock arm due to processing on the foundation, it is preferred that the lock arm is at least partially arranged in the housing.
[0012]
In terms of manufacturing technology, it is preferable that the lock arm is rotatable around at least one bearing position provided in the housing.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to the drawings.
[0014]
A wall slit forming apparatus for forming a slit in a wall shown in FIG. 1 includes a housing 10, a drive unit 20 for a slit forming tool 40 fixed to the housing 10 and configured by at least one disk 50, and a carriage. 30.
[0015]
The housing 10 is parallel to the disk plane of the slit forming tool 40 with respect to the carriage 30 and can be rotated against the spring force of the spring 36 around a bearing 34 disposed in one first end region of the apparatus. To. A roller 31 is disposed at each corner of the carriage 30 to facilitate movement of the carriage 30 on the foundation U to be worked on. The roller 31 is arranged so that the carriage 30 or the entire apparatus can move in parallel with the plane of the slit forming tool 40.
[0016]
Two disks 50 constituting the slit forming tool 40 are fixed to a drive shaft 21 of a transmission device (not shown) connected to the drive unit 20, and a cutting blade material is attached around these disks 50.
[0017]
Hand grips 11 and 13 are provided on the housing 10 above one of the first end regions and the second end region where the bearings 34 of the carriage 30 are provided, respectively. An electrical switch 12 is provided on the handgrip 11 located in the first end region of the device to enable the drive unit 20 to operate. The hand grip 13 disposed in the second end region of the device is provided with a lock switch 14 for operating a braking device 15 for restricting the rotation between the housing 10 and the carriage 30, and the spring is operated by the operation of the braking device 15. The detent 151 rotates against the force of the element 17. In the locked state of the detent 151, the lock switch 14 is not pushed down, that is, as shown in FIG. 2, the free end of the lock rail 32 in which the braking surface 153 of the detent 151 protrudes from the carriage 30 toward the housing 10. This is because it abuts on the top. At the same time, the control curved surface 152 of the detent 151 presses the lock arm 18 away from the lock rail 32 against the force of the spring portion 19. In the released state, the detent 151 does not act on the lock rail 32, and the housing 10 can rotate with respect to the carriage 30.
[0018]
The lock rail 32 is provided with a depth stop 33 provided with a clamp region not shown in detail in the drawing, and the depth stop 33 can be moved stepwise along the lock rail 32. The clamp region acts to lock the shape of the cut portion 321 of the lock rail 32 constituted by the region provided with at least one notch. Similarly, the depth stopper 33 can be adjusted to a required slit depth based on the adjustment scale 35 protruding from the carriage 30.
[0019]
As shown in FIG. 3, when the lock switch 14 is operated, the detent 151 is rotated around the rotation axis 103 of the housing 10 from the locked state to the released state by the transmission element 16. In this way, the lock rail 32 can be freely released from the braking curved surface 153 provided on the detent 151, and the housing 10 can be rotated in the direction of the lock rail 32 or the carriage 30.
[0020]
The limit surface 101 facing the depth stop 33 of the housing 10 stops when it reaches the stop surface 331 of the depth stop 33 provided on the lock rail 32, and this state is shown in FIG. In this state, the housing 10 is restrained at the position of the depth stop 33 adjusted to the required slit depth. This state continues until the lock switch 14 is operated. The apparatus remains in this working state, and the disk 50 of the slit forming tool 40 protrudes from the side surface of the carriage 30 that faces the work base surface U, and the protruding amount can be read by the adjustment scale 35.
[0021]
The restraint of the housing 10 at the depth side surface 33 is caused by a configuration in which the lock arm 18 around the bearing 102 of the housing 10 can rotate in the direction toward the carriage 30, and the lock arm 18 is locked to the lock rail 32 by a shape lock. Can be fixed. Fixing by such a shape lock is performed by engaging the protruding portion 181 disposed on the lock arm 18 with the cutout portion 321 constituting the meshing region of the lock rail 32. The protrusion 181 is located in the free end region of the lock arm 18 on the side opposite to the bearing 102 of the housing 10, and has a stop surface 182 opposite to the carriage 30 and a guide surface 183 opposite to the carriage. The stop surface 182 extends substantially parallel to the disk surface of the slit forming tool 40 and extends perpendicular to the longitudinal direction of the lock rail 32. The free end of the lock arm 18 is formed by a guide surface 183, and the guide surface 183 is inclined with respect to the stop surface 182 toward the free end of the projecting portion 181, and forms an acute angle with the stop surface 182.
[0022]
The lock arm 18 is acted upon by a spring part 19 configured as an entanglement spring, which spring part 19 is arranged at the bearing position 102 of the housing 10. The first free end region of the spring portion 19 is supported by the stop edge 104 of the housing 10, the second free end region is applied to the lock arm 18, and the protrusion 181 is pressed in the direction of the detent 151.
[0023]
Below, the step which forms a slit in a base surface is demonstrated in detail.
[0024]
FIG. 2 shows the braking device 15 in the initial state of the device for forming a slit in the wall. The lock switch 14 is not pushed down, the free end of the lock rail 32 abuts on the braking surface 153, and the detent 151 remains in the locked position. The control curved surface 152 of the detent 151 pushes the lock arm 18 away from the lock rail 32.
[0025]
As is clear from FIG. 3, the detent 151 is in a released state, and the housing 10 is rotated in the direction of the carriage 30. The protruding portion 181 of the lock arm 18 is in contact with the lock rail 32. Guide surface 183 which is partially inclined acts to prevent the locking arm 18 and meshing with the cutout 321 of the lock rail 32.
[0026]
FIG. 4 shows the braking device 15 in the working state of the wall slit forming device. The limiting surface 101 of the housing 10 abuts on the stop surface 331 of the depth stop 33, and the protruding portion 181 of the lock arm 18 enters the cut portion 321 of the lock rail 32. In this working position, the braking device has a control curved surface 152 adjacent to the lock arm 18.
[0027]
After the slit is formed, the slit (not shown) in the foundation U releases the lock switch 14 to rotate the detent 151 in the lock position under the spring force of the biased spring element 17. The rotation of the detent 151 causes the control curved surface 152 of the detent 151 to act to push the lock arm 18 to the release position against the force of the spring portion 19. Thereby, the shape lock connection between the lock arm 18 and the lock rail 32 is released, and the housing 10 of the carriage 30 can be rotated again to the initial position shown in FIG.
[Brief description of the drawings]
FIG. 1 is a side view of a wall slit forming device according to the present invention in a resting state.
Figure 2 is an enlarged sectional view of the locking mechanism of the wall slits forming apparatus shown in FIG. 1 is an enlarged partial sectional view showing an initial state for the carriage of the housing.
FIG. 3 is an enlarged partial cross-sectional view showing an intermediate state of the housing with respect to the carriage.
FIG. 4 is an enlarged partial cross-sectional view showing a working state of the housing with respect to the carriage.
[Explanation of symbols]
10 Housing
11,13 Hand grip
12 Electric switch
14 Lock switch
15 Braking device
16 Transmission element
17 Spring element
18 lock arm
19 Spring part
20 Drive unit
21 Drive shaft
30 Carriage
31 Laura
32 lock rail
33 Depth stop
34 Bearing
35 Adjustment scale
36 spring
40 Slit forming tool
50 disks
101 Restricted surface
102 Bearing
103 axis of rotation
104 Stop edge
151 Detent
152 Control surface
153 Braking surface
181 Protrusion
182 Stop surface
183 Information plane
321 Excision
331 Stop surface

Claims (5)

In order to form a slit in the wall, a housing (10) having two hand grips (11, 13) is provided, and the housing (10) has a slit forming tool (40) constituted by at least one disk (50). ) Holding the drive unit (20) for the carriage (30) and against the carriage (30) parallel to the disk plane of the slit forming tool (40) against the spring force of the spring (36) The bearing (34) arranged in one end region is rotatable about a bearing (34), and the second end region of the carriage (30) protrudes toward the housing (10) and has an adjustable depth. stopping the lock rail (32) mounted (33) is provided, wherein the housing (10) operate in conjunction with engagement with the locking rail (32) and rotatable detent (151) Provided, in wall slit forming apparatus which can be operated by a locking switch (14) provided in the handgrip of the detent (151) (11, 13), said housing (10), said locking rail A lock arm (18) that engages with and cooperates with (32), a spring portion (19) that presses the lock arm (18) against the lock rail (32) in a locked state, and the return arm; The stopper (151) is provided with a control curved surface (152) which engages with the lock arm (18) to operate in a linked manner . The lock arm (18) is provided with at least one protrusion (181), and the protrusion (181) can be fixed to the cut portion (321) of the lock rail (32) by a shape lock. The wall slit forming apparatus according to 1. The protrusion (181) is provided with a stop surface (182) opposite to the carriage (30) and a guide surface (183) opposite to the carriage, and the stop surface (182) is provided with the stop surface (182). The lock rail (32) extends in a direction perpendicular to the length direction of the lock rail (32), and the guide surface (183) is inclined in the direction of the stop surface (182) toward the free end of the protrusion (181). Item 3. A wall slit forming apparatus according to Item 2. The wall slit forming device according to any one of claims 1 to 3, wherein the lock arm (18) is at least partially disposed in the housing (10). The wall slit formation according to any one of claims 1 to 4, wherein the lock arm (18) is rotatable around at least one bearing position (102) provided in the housing (10). apparatus.

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