FI105390B - Drill and chisel apparatus - Google Patents

Description

105390

Drilling and grooving tool. - Borr- och mejselapparat.

The invention relates to a drilling and / or reciprocating tool having a body, an impact piston comprising an excitation piston and at least one crankshaft, a drive motor mounted on the frame, a drive shaft comprising a drive shaft and a transmission between the impactor and the drive motor.

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DE-PS 34 05 922 discloses a drilling and / or etching tool comprising a drive motor, an impact device and a gear, wherein the impact device and its vibrations form a mass disengaged from the body which is movably mounted on the body in the impact direction and supported by damping means. In this way, the shocks and vibrations caused by the counter pulses of the tools are transmitted in a damped manner to the body and the handle attached thereto.

20 The drive motor stationary in the body forms a residual mass with the body which acts to retard the acceleration of the vibrating mass. The impactor is driven by a drive motor whose driving shaft is at right angles to the impact direction of the impactor.

During the movement of the impactor, which is made possible by the damping means, the corresponding movement of the crankshaft takes place with respect to the drive shaft of the drive motor stationary in the frame. The toothed area of the crankshaft then extends into the gearwheel inner toothed wheel and can move within it 30 torsionally in a limited longitudinal direction.

The disadvantage of this known drilling and / or etching tool is that the toothed area of the crankshaft and the gearwheel are worn out quickly due to the continuous abrasion of their gear.

It is an object of the invention to provide a drilling and / or engraving tool in which the rotational movement is transmitted smoothly from the drive motor to the impactor.

This is achieved by the invention in that the axis of rotation of the crankshaft of the impactor 5 extends approximately at right angles to the direction of impact of the impactor and that there is an axial displacement compensating member acting between the drive motor and the impactor.

10 As the crankshaft moves during operation in the direction of impact of the impactor relative to the drive shaft of the drive motor, the shaft displacement compensation member transmits the rotational motion or torque of the drive motor to the crankshaft of the impactor without wear. The drive motor may be positioned such that the drive shaft extends substantially concentric with the crankshaft of the impactor in rest.

In order to achieve a specific rotation speed of the crankshaft which differs from the speed of rotation of the drive shaft, it is necessary to place 20 · 't between the impactor and the drive engine

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•. Gearing. It can be located primarily between the drive motor and the shaft offset member. To this end, the body • f: '> ybi have bearings for the gearbox.

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: .ten thus fixed in the drill and / or * * * * ····································································································. The drive motor can be · · · 'positioned so that the drive shaft is positioned at different locations. than the crankshaft of a dummy impactor.

The rotational movement of the drive shaft of the drive motor transfers the crankshaft 30 to the crankshaft of the impactor, preferably consisting of a convex toothed clutch. This minor component axial displacement • ·: shaft can be manufactured economically. The convex toothed clutch according to the invention primarily has an outer gear on the crankshaft of the impactor 35 which acts in conjunction with the inner gear of the coupling shaft, wherein the teeth of the outer gear are convex and curved 105390 3 and the inner gear has a corresponding counter-shape.

It is expedient for the gear wheel to have an outer gear engaging the drive shaft of the drive motor and an inner gear engaging the outer gear engaging the coupling shaft, wherein the teeth of the outer gear disposed on the coupling shaft are convex and have a corresponding counter-shape. This achieves angular mobility of the coupling shaft in all directions.

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As the crankshaft moves parallel to the drive shaft of the drive motor or the gearwheel, their distance changes. The change in distance is compensated by a curved recess in the base of the inner teeth and a correspondingly curved protrusion on the free end of the coupling shaft comprising the outer teeth. The axial play of the coupling shaft is thus the same in all angular positions.

To create a maintenance-free, oil and chemical-resistant 20: clutch with a moment of inertia and a mass of -., N, the clutch shaft is primarily made of plastic.

· I • «-. '• The axial displacement compensating member consists primarily of a cross: .plate coupling, called the Oldham coupling, in which the simple, easy-to-manufacture parts work together. Impact crankshaft and transmission. the small wheel is connected to hubs with slots, which • · «.

'The protrusions at the various points of the floor plate extend.

It is advantageous to have a shaft shift compensating member consisting of a parallel crank clutch, called a Schmidt clutch, in which the rotating small wheel, which is fixedly mounted on the gearbox body, is in close contact with the plate and the crankshaft bearing plate. There is a spacer between the plate and the bearing-35 plate. The plate, the washer and the washer are interconnected by bolts with an equally long arm so that two successive 4 105390 parallel crank mechanisms are formed and the rotational movement is accurately angled.

The invention will now be illustrated in more detail with reference to the accompanying drawings in which three examples are given

Figure 1 schematically shows a drilling and / or etching tool according to the invention.

Figure 2 shows a drilling and / or etching tool with a cross-plate switch (Oldham switch).

Figure 3 shows a drilling and / or etching tool with a convex toothed switch.

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Figure 4 shows a drilling and / or etching tool with a parallel crank coupling (Schmidt coupling).

The drilling and / or reciprocating tool shown in Figure 1 consists of: • 20 · mainly a frame 1, a handle 2, a control switch 3 located on the handle area, an electric cable 4, a tool holder 5 to attach the tool 6, and an auxiliary; 1 is a diagrammatic representation of a cylindrical guide for the impactor 8;

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25. * Switch 16. The impactor 8 is similarly used schematically

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'The drive shaft 10 of the drive motor 9 shown which moves impact the impactor 8 by means of the gearbox 11 and the axial displacement adjusting member 12.

Figures 2, 3 and 4 show an enlarged view of the interior of three different types of drilling and / or engraving tools. All three · · · have substantially cylindrical guide tubes 16, 36, 56, »« • with radial projections 17, 18, 37, 38, 57, 58.

The guide tube 16, 36, 56 is disposed in longitudinally displaceable guides 25, 35 26, 47, 48, 67, 68 on the frame. Between the guide 13, 30, 50 of the guide 13, 30, 50 and the projection 18, 38, 58 of the guide tube 16, 36, 56, the outer tube of the guide tube 16, 36, 56

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The spring 19, 39, 59 located on the 5 side presses the projection 17, 37, 57 against the end region of the body guide 25, 47, 67.

A guide cradle 16, 36, 56 is provided with a two-piece crankshaft 14, 34, 54 having an axis of rotation at right angles to the center axis of the guide tube 16, 36, 56. The crankshaft 14, 34, 54 is located in the respective through holes of the guide tube 16, 36, 56. The crankshaft 14, 34, 54 has an excitation piston 15, 35, 55 hung on the connecting rod 10, which is movable within the guide tube 16, 36, 56. The sealing of the excitation piston 15, 35, 55 towards the inner wall of the guide tube 16, 36, 56 is effected by means of a sealing ring formed by an O-ring around the excitation piston.

The impactor 8, 28, 69, consisting essentially of a crankshaft 14, 34, 54, a non-shown percussion piston and a connecting rod exciter piston 15, 35, 55, can be driven by a drive motor 9, 31, 51 and a drive shaft 10, 20: 32, 52. The axis of rotation 32, 52 extends substantially at right angles to the center axis of the guide tube 16, 36, 56. The drive motor 9, 31, 51 is connected to / -. to the body 13, 30, 50 fixedly. On the drive shaft 10, 32, 52; is a tooth and forms part of the gearbox 11, 29, 25 /: - 49, which is likewise fixedly connected to the body 13, 30, «· · 50. The small wheel 21, 41, 61 forms the gearbox 11, 29,. . 49 second part.

• m · • t · · *. When the percussion device 8, 28, 69 is used, the excitation piston 15, 30 ^ / 35, 55 and the percussion piston move in the longitudinal direction, so that the percussion piston applies to the tool not shown. lousy impulses. Upon returning the tool, there is an I · 'impingement which acts away from the impact direction and causes a slight displacement of the guide tube 16, 36, 56 in the longitudinal direction 35 from the impact direction. The displacement of the guide tube 16, 36, 56 may also occur 54 due to imbalance and vibration of the impactor 8, 28, 69 gas force 6 105390. The crankshaft 14, 34, 54 must therefore be bearing disengaged from or relative to the guide tube 16, 36, 56. The longitudinal displacement is damped by the spring 5 By means of damping means formed by 39, 59 disposed between the guide 26, 48, 68 of the housing 13, 30, 50 and the projections 18, 38, 58 of the guide tube 16, 36, 56. The displacement of the guide tube 16, 36, 56 also causes the impact device 8, 28, 69 crankshaft 14, 34, 54. Thus, the crankshaft 14, 34, 54 shifts relative to the gearbox pulley 21, 41, 61. With this axial offset For this purpose, an axial displacement compensation member 12, 33, 53 is disposed between the crankshaft 14, 34, 54 and the pulley 21, 41, 61.

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The axial displacement compensating member 12 shown in Fig. 2 consists of a cross-plate switch, also called an Oldham switch. The crankshaft 14 and the gear wheel 21 of the gearbox 11 are connected to the hubs 22, 24 having a gap. The cavities a 20: 'engage the spacers 23 at 90 ° relative to each other. The cams 22' 'pn connected to the small wheel 21 are mounted in position on the body 13 by means of a corresponding bearing point 20. As the guide tube 16 moves Also in the direction of a · tf tl • ^, the hub 24 moves longitudinally with respect to the fixed I (i 25 '11 h) 22.

1 · · ^ The axial displacement compensating member 33 shown in Fig. 3 consists of a f · c ί.uper convex toothed coupling having a crankshaft 34: · communicating with an external gear hub 44 which 30.

The gear wheel 41 has a cup 41 shaped as a cup and has an internal gear 43 and actuator 31 for the drive motor.

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• External toothing with Selin 32. The inner teeth 42 engage the respective outer teeth 42 of the torque shifting coupling shaft 46 35 Both the teeth of the outer shaft 42 of the coupling shaft 46 and the outer teeth of the crankshaft 34 are curved and convex so as to provide angular mobility of the clutch shaft 46. The teeth of the inner teeth 45 of the kyt kinaxel 46 and the teeth of the inner wheel of the sliding wheel 41 have a corresponding counter-shape. The bottom wheel 41a of the flywheel 41 and the bottom 46a 5 of the clutch shaft 46 have a curved recess. There is a curved protrusion at the free end 46b of the coupling shaft 46 including the outer gear 42 and at the free end 44a of the hub 44 connected to the crankshaft 34 with the external gear. The radius of the curved recess is greater than that of the curved protrusion. The small wheel 41 in the shape of a cup 10 is rotatably fixed at the bearing position 40 of the body 30.

The axial offset compensating member 53 shown in Figure 4 is a rin-toothed crank clutch, also called a Schmidt clutch-15. It consists of a plate 62, a washer 63 disposed torsionally on the drive shaft 52 or a wheel 61, and a bearing plate 64 shifted radially or parallel to the center axis of the drive shaft. The plates are interconnected by means of two bolts of equal length 20 ' the parallel crank mechanism and the «44 rotation movement is angularly accurate. Part of transmission 4 f /. ; the pin-like extension of the forming small wheel 61 is fixed C 4 1 /, · 2 rotating at the corresponding bearing position 2511 of the body 50. 60.

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Claims (10)

1. Drilling and / or chisel apparatus with a housing (13, 30, 50), a percussion (8, 28, 69. with impulse piston (15, 35, 55) and at least one piece crankshaft) (14, 5 34). 54), a housing-driven drive motor (9, 31, 51) with drive shaft (10, 32, 52) and a gear (11, 29, 49) between the percussion (8, 28, 69) and the drive motor (9, 31, 52) , wherein the percussion (8, 28, 69), with support against damping elements, is displaceably arranged relative to the housing (13, 30, 50) parallel to the percussion of the percussion (8, 28, 69), characterized in that the axis of rotation of the percussion (8, 28) , 69) crankshaft (14, 34, 54) extends substantially perpendicular to the direction of impact of the percussion (8, 28, 69), and that between the drive motor (9, 31, 51) and percussion (8, 28, 69) is arranged a shaft offset smoothing element (12, 33, 53) acting parallel to the direction of impact of the percussion (9, 28, 69). Drilling and / or chisel apparatus according to claim 1, characterized in that the gear (11, '29, 49) is arranged between the drive motor (9, 31, 51) and the shaft smoothing element (12, 33, 53). Drilling and / or chisel apparatus according to claim 1 or 2, characterized in that the shaft offset equalizing element (33) is designed as a convex gear coupling. 4. A drilling and / or chisel apparatus according to claim 3, characterized in that the percussion shaft (34) of the percussion (34) has an external tooth, which cooperates with an internal tooth (45) of a coupling shaft (46), the teeth of the external tooth being slightly convex and beak-shaped, and the internal toothing. .. even (45) cogs have a corresponding counter shape. • · • · • t · I »· • · t 5. Drilling and / or chisel apparatus according to claim 3 or 4, characterized in that a 4 4 ·; The driving gear (41) of the gear (29) has an external gear which cooperates with the drive shaft (31) of the gear motor (32) and one with an external gear (42) ρέ • ·:: in the coupling shaft (46) tooth (43), wherein the outer teeth (42) of the tooth (42) are slightly convex and beak-shaped and the teeth of the internal tooth (43) have a corresponding counter-shape. 6. Drilling and / or chisel apparatus according to claim 5 or 6, characterized in that the coupling shaft (46) is made of plastic. 7. Drilling and / or chisel apparatus according to claim 1 or 2, characterized in that the shaft offset equalizing element (12) is designed as Oldhams coupling. 10 Drilling and / or chisel apparatus according to claim 7, characterized in that the crankshaft (14) and a driving gear (21) of the gear (11) start in contact with each hub (24, 22), wherein the hub (24, 22). ) has slots into which mutually displaced cams of an intermediate disk (23) project. 15 9. Drilling and / or chisel apparatus according to claim 1 or 2, characterized in that the shaft offset equalizing element (53) is designed as parallel crank coupling. 10. A drilling and / or chisel apparatus according to claim 9, characterized in that a fixed (1) housing at a "c" (('' 'housing, rotatably driven gear (61) of the gear (49)) is fixedly fixed to a disc. (62), and the crankshaft (54) has a fixed connection to a bearing disc (64), the bearing discs (62, 64) being connected to one between the two bearing discs (62). , 64) arranged intermediate disk via articulated arms (65, 66). • · ♦: 25 III fcV • · · · · · · · · I • · ··· • II • · • II (• · • · · • · · • 1 «« • · · • · • «· · t • · · · · · I * 1« • · · • ·