JPH0680543U - Hand tools for grinding and polishing - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a hand tool for grinding / polishing, in which the sliding stroke of a grindstone member can be adjusted, and the finishing accuracy can be appropriately changed and adjusted without replacing the grindstone member. [Structure] A rod 6 having a grindstone member 7 at its tip is slidably inserted into a casing 1 at a base end side thereof. A motor rotating shaft 25 is arranged inside the casing 1 in a direction orthogonal to the rod 6. A first eccentric sleeve 3 is provided on the outer circumference of the rotary shaft 25, and a second eccentric sleeve 4 is rotatably mounted on the outer circumference of the sleeve 3. The second eccentric sleeve 4 is rotatably fitted on the inner periphery of the ring portion 5a of the crank 5 connected to the base end of the rod 6. Second
The rotation of the eccentric sleeve 4 is stopped by a screw 4c so as to be released. By loosening the set screw 4c and rotating the second eccentric sleeve 4 to change the eccentric amount of the sleeve 4 with respect to the rotating shaft 25, the sliding stroke of the grindstone member 7 is appropriately changed and adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hand tool for converting the rotation of a high-speed rotary motor into reciprocating motion to reciprocate the grindstone member at the rod tip at high speed to grind and polish a workpiece.

[0002]

[Prior art]

 Conventionally, the base end side of a rod having a grindstone member at the tip is slidably inserted into the casing, and the other end ring portion of the crank connected to the base end of the rod is moved in the direction orthogonal to the rod. It is configured to be externally fitted to the provided motor rotation shaft, and an eccentric member is interposed between the ring portion and the motor rotation shaft. A hand tool for grinding / polishing is known in which a grinding wheel member at the tip of the rod is reciprocated at high speed by transmitting back and forth reciprocating motion to the rod (for example, Japanese Patent Application No. 4-9682 filed by the applicant of the present application). ). The sliding stroke of the grindstone member is determined according to the amount of eccentricity of the eccentric member with respect to the motor rotating shaft. Specifically, the grindstone member reciprocates at a high speed with a stroke twice the eccentric amount of the eccentric member with respect to the motor rotating shaft. .

[0003]

[Problems to be solved by the device]

 By the way, with the above hand tools, the sliding stroke of the grindstone member is determined according to the amount of eccentricity of the eccentric member, so if you want to change the finishing accuracy of the ground or polished surface, replace the grindstone member. I had to do it. Therefore, in a conventional hand tool, a collet is provided at the rod tip, and multiple types of grindstones with shafts that can be detachably held by the collets are prepared, and the grindstone with shaft is appropriately selected according to the finishing accuracy to be obtained. It was supposed to be replaced.

The present invention has been made in view of such conventional circumstances, and an object of the present invention is to make a roller capable of variably adjusting a sliding stroke of a grindstone member without finishing the grindstone member. It is to provide a hand tool for grinding / polishing whose precision can be changed and adjusted appropriately.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a hand tool for grinding / polishing according to the present invention is configured such that a base end side of a rod having a grindstone member at its tip is slidably inserted into a casing, and the rod is provided inside the casing. A first eccentric sleeve is provided on the outer circumference of the motor rotating shaft arranged in a direction orthogonal to the second eccentric sleeve, and a second eccentric sleeve is rotatably mounted on the outer circumference of the first eccentric sleeve, and on the outer circumference of the second eccentric sleeve. Includes a ring portion provided at one end of a crank, the other end of which is connected to a rod base end, so as to be rotatable, and further, the second eccentric sleeve is detachably fixed to the ring portion by a desired fixing means. This is characterized.

[0006]

[Action]

 According to the above configuration, the eccentric rotation of the ring portion caused by the high-speed rotation of the motor rotating shaft causes the crank and rod to slide back and forth, causing the grindstone member at the rod tip to reciprocate at high speed. Since the amount of eccentricity of both the first eccentric sleeve and the second eccentric sleeve with respect to the rotary shaft acts on the rotation, the fixing by the fixing means is released, and the second eccentric sleeve is rotated to operate the second eccentric sleeve. By changing the amount of eccentricity of the eccentric sleeve, the sliding stroke of the grindstone member can be arbitrarily changed. Therefore, the above-described object of changing and adjusting the finishing accuracy without replacing the grindstone member is achieved.

[0007]

【Example】

 An embodiment of a hand tool for grinding and polishing according to the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional front view of a hand tool of the present embodiment. In the figure, 1 is a casing, 2 is an air motor, 3 is a first eccentric sleeve, 4 is a second eccentric sleeve, 5 is a crank, 6 is a rod, and 7 is Represents a grindstone member.

The casing 1 includes a rear end of a substantially conical front half 1a and a substantially cylindrical rear half 1b rotatably connected in a horizontal direction. A rod 6 can slide in the front half 1a. Besides, the rear half 1b is equipped with an air motor 2, a first eccentric sleeve 3, a second eccentric sleeve 4, a crank 5, and the like.

The front half 1a of the casing 1 has a through hole 11 formed along its axis, and a linear guide bearing 12 is loaded with the front half of the through hole 11 having a large diameter to mount the base of the rod 6. Insert the end side slidably. Further, an O-ring 13 having a substantially X-shaped cross section is attached to the outer periphery of the linear guide bearing 12 to support the bearing 12 so that the bearing 12 can swing, and thereby the radial deviation of the rod 6 can be absorbed. To do. A cover 14 is attached to the tip of the first half 1a to prevent the linear guide bearing 12 from coming off.

A pair of upper and lower connecting pieces 15a, 15b are extended at the rear end of the casing front half 1a, and sliding contact surfaces 16a, 16b slidably contacting the connecting pieces 15a, 15b are provided on the upper and lower surfaces of the front end of the rear half 1b. The front half of the casing 1a is formed by sandwiching the tip side of the rear half 1b with both connecting pieces 15a, 15b, and screwing the stop screws 17a, 17b into the sliding surfaces 16a, 16b with the connecting pieces 15a, 15b. The rear half 1b is connected to the rear end of the rear side so as to be rotatable in the horizontal direction.

As shown in FIG. 3, a circular arc-shaped long hole 18a is formed in the upper connecting piece 15a, and a protrusion slidably inserted into the long hole 18a is formed in the sliding contact surface 16a. 18b is provided to guide the rotation of the latter half 1b. Further, as shown in FIG. 4, the lower connecting piece 15b is provided with engaging recesses 19a at appropriate intervals along the rotation direction of the rear half 1b, and the sliding contact surface 16b is similarly provided with engaging projections 19b. As a result, the rotation of the latter half portion 1b becomes an intermittent rotation in small increments, which is performed when the stop screw 17b is slightly loosened.

A turbine chamber 21 and an air supply passage 22 and an exhaust passage 23 communicating with the turbine chamber 21 are defined in the latter half portion 1b of the casing, and the air supply passage is formed on the inner bottom of the turbine chamber 21. The air motor 2 is configured by loading a turbine 24 that rotates at high speed with compressed air flowing through the exhaust passage 22 and the exhaust passage 23. A rotating shaft (motor rotating shaft) 25 that rotates integrally with the turbine 24 is inserted and attached to the center of the turbine 24. The rotary shaft 25 is supported by bearings 9c and 9d described later in a direction orthogonal to the rod 6.

A shaft body 8a is inserted into the rear end of the casing rear half portion 1b, and a bottomed cylindrical operation body 8b is screwed onto the outer periphery of the shaft body 8a so as to be able to move forward and backward. A primary side communication passage 81 communicating with the compressed air supply tube 8c and a secondary side communication passage 82 communicating with the air supply flow passage 22 are formed in the shaft 8a, and the operation body 8b is provided with the above-mentioned inner periphery. A communication groove 83 that connects the two communication passages 81 and 82 is formed, and a valve body 85 that comes into contact with and separates from the valve seat 84 by the screwing forward and backward movement of the operating body 8b is provided in the communication groove 83. A switching valve 8 for turning on / off the drive of is formed. An exhaust passage 86 communicating with the exhaust passage 23 is formed in the peripheral wall of the operating body 8b.

Above the turbine chamber 21, a crank chamber 9a that coaxially communicates with the through hole 11 inside the casing first half portion 1a is formed by partitioning and printing, and the rotary shaft is centered on the bottom wall of the crank chamber 9a. Open the hole 9b into which 25 is loosely inserted. The bottom wall and the peripheral wall of the crank chamber 9a are provided with an appropriate number of through holes that allow the turbine chamber 21 and the exhaust passage 23 to communicate with each other. Further, below the turbine chamber 21 and above the crank chamber 9a, bearings 9c and 9d for rotatably designing the rotating shaft 25 are provided.

A first eccentric sleeve 3 made of a shaft body having an appropriate diameter is eccentric to the center O ₁ of the rotary shaft 25 by a predetermined amount on the outer circumference of a portion of the rotary shaft 25 which is inserted through the crank chamber 9a. Attach by fitting.

A bearing 3a is fitted to the outer periphery of the first eccentric sleeve 3 concentrically with the sleeve 3, and a second eccentric sleeve 4 is attached to the outside of the bearing 3a. On the outside of the second eccentric sleeve 4, a ring portion 5a provided at one end of a crank 5 connecting the other end to the base end of the rod 6 is mounted.

As shown in FIGS. 5 to 7, the second eccentric sleeve 4 has an annular shape having an inner peripheral surface 41 into which the bearing 3 a is inserted and an outer peripheral surface 42 eccentric to the inner peripheral surface 41 by a predetermined amount. A collar 4b is provided on the upper surface of the body 4a so as to be in sliding contact with the upper edge of the ring 5a. The annular body 4a is rotatably inserted into the inner circumference of the ring 5a and the ring 5a and the bearing 3a are inserted. By interposing eccentricity between them and fixing the collar portion 4b to the ring portion 5a with the screw 4c, the ring portion 5a can be eccentrically rotated integrally. Further, the collar portion 4b and the ring portion 5a are provided with long holes 4d and 5b into which the locking screws 4c are screwed, so that the eccentric direction of the annular body 4a can be arbitrarily adjusted. The amount of eccentricity of the eccentric sleeve 4, that is, the amount of eccentricity of the ring portion 5a with respect to the rotating shaft 25 can be arbitrarily adjusted.

The crank 5 is formed by integrally projecting a shaft body 5c on the peripheral surface of a ring portion 5a externally fitted to the second eccentric sleeve 4, and the tip end side of the shaft body 5c is loaded with a pin 5d. 6 Connect to the base end side.

The tip portion of the rod 6 protruding from the casing 1 is hollow and slotted, and a tightening nut 61 is screwed to the outer periphery of the slot to form a collet portion 6a. The collet portion 6a holds the grindstone member 7 detachably.

In the grindstone member 7, a grindstone 72 is integrally provided at the tip of the shaft portion 71 held by the collet part 6a, and it is easy to make a plurality of grindstones 72 for rough finishing, dense finishing, etc. The rod 6 is attached to the tip of the rod 6 after being selected and replaced as appropriate according to the finishing accuracy, the shape of the surface to be ground, the shape of the polished surface, etc.

A method of using the hand tool of the present embodiment having the above configuration will be described below. First, the set screws 4c, 4c are loosened and the second eccentric sleeve 4 is rotated to preset the eccentric direction of the annular body 4a to a predetermined position, for example, the position shown in FIG. In this state, if the valve body 85 is separated from the valve seat 84 by operating the switching valve 8, the compressed air supplied from the supply tube 8c will be the primary side flow path 81, the secondary side flow path 82, and the air supply flow path 22. , The turbine chamber 21, the exhaust passage 23, and the exhaust passage 86, whereby the first eccentric sleeve 3 eccentrically rotates as the turbine 24 and the rotary shaft 25 rotate at high speed, and further the second eccentric sleeve with respect to the rotary shaft 25. The crank 5 reciprocates back and forth while the ring portion 5a rotates eccentrically in accordance with the eccentricity of the rod 4, and the rod 6 and the grindstone member 7 integrally move at high speed while absorbing the lateral displacement of the crank 5 by the O-ring 13. Reciprocates.

The second eccentric sleeve 4 is set at the position shown in FIG. 6, that is, the center O _{2 of} the second eccentric sleeve 4 is concentric with the rotary shaft 25 and When the eccentric amount of the eccentric sleeve 4 is 0, the eccentric amount of the first eccentric sleeve 3 with respect to the rotary shaft 25 is prioritized, and the sliding stroke S ₁ of the grindstone member 7 is determined according to the eccentric amount.

From the state shown in FIG. 6, the stop screws 4c, 4c are loosened again and the second eccentric sleeve 4 is rotated to change the eccentric direction of the annular body 4a. For example, if the position is set to the position shown in FIG. The eccentric amount of the second eccentric sleeve 4 with respect to the above is given priority, and the sliding stroke S _{2 of the} grindstone member is determined according to the eccentric amount.

Further, by loosening the screw 17b and rotating the casing front half 1a, the casing rear half 1b, that is, the angle of the front half 1a with respect to the casing gripping portion is changed. The hitting angle of the grindstone member 7 and the gripping angle of the gripping part can be adjusted appropriately (see FIGS. 8 (a) and 8 (b)).

The means for fixing the second eccentric sleeve 4 to the ring portion 5a is not limited to the one described above, and for example, screws having elongated holes may be screwed into the peripheral wall of the ring portion 5a and the outer peripheral surface 42 of the annular body. It is possible to freely make changes within a well-known range, for example, by forming through holes instead of the long holes at appropriate intervals.

[0026]

[Effect of device]

 Since the hand tool according to the present invention is constructed as described above, the crank and rod sliding strokes can be adjusted by rotating the second eccentric sleeve to change the eccentric amount of the second eccentric sleeve with respect to the motor rotating shaft. Can be changed appropriately.

Therefore, it is possible to change the sliding stroke of the grindstone member and adjust it by an extremely easy operation, which was not possible with the conventional products, and it is possible to appropriately change the finishing accuracy without replacing the grindstone member. In addition, we were able to provide a hand tool for grinding and polishing with excellent operability, with a simple structure and low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a hand tool for grinding and polishing according to the present invention, in which a rod tip portion is partially omitted.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a sectional view taken along line (3)-(3) of FIG.

FIG. 4 is a sectional view taken along line (4)-(4) of FIG.

FIG. 5 is an exploded perspective view showing the periphery of a motor rotation shaft.

FIG. 6 is a plan cross-sectional view showing the periphery of a motor rotation axis, showing a state of a large stroke.

FIG. 7 is a plan cross-sectional view showing the periphery of a motor rotation axis, showing a state with a small stroke.

FIG. 8 is a plan view showing an angle adjustment state of the casing.

[Explanation of symbols]

1: Casing 2: Air motor 2
5: Rotating shaft 3: First eccentric sleeve 4: Second eccentric sleeve 4
c: Stop screw 5: Crank 5a: Ring part 6: Rod
7: Whetstone member

Claims (1)

[Scope of utility model registration request] 1. A base end side of a rod having a grindstone member at its tip is slidably inserted into a casing, and a first portion is provided on the outer periphery of a motor rotating shaft arranged in a direction orthogonal to the rod inside the casing. An eccentric sleeve is provided, a second eccentric sleeve is rotatably mounted on the outer periphery of the first eccentric sleeve, and the other end of the second eccentric sleeve is provided at one end of a crank connecting the other end to the rod base end. A hand tool for grinding and polishing, wherein the ring portion is rotatably fitted and the second eccentric sleeve is detachably fixed to the ring portion by a desired fixing means.