JPS60191708A - Hammer drill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a moving tool, that is, a hammer drill, and particularly relates to a hammering mode, a drilling mode, and a motor that combines a hammer and a drill. This invention relates to a type of movable crab tool that can be selectively operated. Such movable crab tools are mainly made of concrete or stone.
used for work.

BACKGROUND OF THE INVENTION In the known prior art, a so-called rotary hammer or hammer drill has been proposed, which is capable of rotating the tip of the drill and at the same time repeatedly applying axial impacts to its bevel. Some types of these conventional movable crab tools include means by which the movable crab tool can be operated to select only rotary or drilling modes of operation and only hammering modes of operation. This selection operation is performed by providing various processing tool elements,
In addition, by changing the amount of insertion of this machining tool element into the movable crab tool and by changing the external shape of the machining tool element, the selection operation mode can be changed. and a hammer element. In other forms of conventional movable tools that do not use different machining tool elements to obtain this selection mode of operation, the operator uses a clutch and or a transmission to select one or more modes of operation. There is a setting-C.

Improvements in this type of movable crab implement according to the prior art are disclosed in pending U.S. Patent Application No. 284, filed August 30, 1972.
, No. 73'8.

Disclosed in the pending application and claimed in the patent application), the use of a hammer drill, drilling only, drilling only, and hammer drilling are also possible. Each application of the combination is determined by selectively positioning the sleeve in three axial positions.

The present invention relates to a hammer drill of the type 1jl disclosed in the above-mentioned U.S. Patent Application No. 284,738, and
/ The aim is to improve the martyryl structure.

The main object of the present invention is that in response to manual rotation of the cam collar,
Mort 8 only for hitting with a hammer, Mort 8 only for drilling with a drill, and n for hammer and drill;
``An object of the present invention is to provide a new and improved hammer drill that can be selectively adjusted to operate one combined motor.''

It is an object of the present invention to provide a coupling sleeve axially positioned in response to actuation of a cam collar to couple the trill chuck support spindle 9 for two operating modes; In order to further clarify the operation mode of 3, 1++ Il^i 1I-1-; Examples of the invention will be described.

Referring to FIG. 16, the movable crab stage or hammer drill has a casing shell or housing shell 10.
have. This hammer drill is very powerful.
b 11 fX: has a suitable power source such as an electric or pneumatic motor to drive. This drive '1itl is engaged with the gear 12 of the gear 13 by means of a suitable reduction gear, which is indicated only in its entirety by the dashed line 14.15.

This ring gear 13 has a shaft 16 that rotates in accordance with the rotation of the ring gear 13.
is attached. This holder 16 is the bearing sleeve 17
The bearing sleeve 17 is placed in a hole 18 formed in the housing part 10a. The ring gear 13 has an annular structure 19 secured thereto by a number of fasteners 20, and the annular structure 19 is provided with a series of annular ratchet teeth 21.

These ratchet teeth 21 are normally opposed by a series of ratchet teeth 22 at a distance h'h, and are arranged in a series.

The ratchet teeth 22 of the ring gear I are secured to the housing plate 24 by means of a number of fasteners 25.
It is integrated with I'r structure 23.

The housing 10 has a hole 2 for receiving a bearing hub 27.
I have G. This earring hub 27 is the spindle 2
The bearing is engaged with one end of 8. A coil spring 30 surrounds the spindle 28 and has opposite ends touching the bearing hub 27, as shown in FIG.
6 to the outside, that is, to the right side of the figure, with the inner end of the shaft 16. This coil spring 30 therefore causes the ratchet teeth 21,22 to move, but also engage as explained below.

The front end of shaft J6 receives a bearing sleeve 32 which is in bearing engagement with the front of spindle 28. Il! 11116 has a reduced diameter part 33 integrated with an annular flange 3/I, and this circular flange 34 has a number of (preferably four) cuts or keyways 35. .

Hindle 28 has an enlarged cylindrical portion 36 with multiple (preferably four) axial grooves or keyways. The spindle 28 is also formed by another cylindrical part 38 on which a drill chuck 40 is mounted. This 1.゛Tsurchuck 4.0 is normal; 1η li'? ? Zodashi,
Therefore, it will not be explained here.

The washer ll 2 is attached to the cylindrical part 38 and is attached to the cylindrical part 3
6. One surface of the Wano Sawyer 42, which is connected to the annular surface 43 formed by the connection of 38, is engaged with a number of ball bearings 44 held at intervals around the circumference by a suitable case 45 These ball bearings 44 are encased in an annular space formed in a ring 17 mounted on the cylindrical portion 38 for rotation therewith.

Connecting sleeve 48 has a number of equally spaced inwardly extending keys 49 equal to the number of keyways 35 . The coupling sleeves 48 also have second keys 50 which are respectively inserted into the keyways 37.

Furthermore, the coupling sleeve 48 has a hole (11) in which a snap ring 52 is inserted. This snap ring 52 has a bearing sleeve 53 that engages the connecting loop 48.
touch one end of the This bearing sleeve 5:3 has at its front end an annular recess into which the annular flange 48a of the coupling sleeve 48 is inserted. Therefore, the connecting sleeve 4
8 and the earring sleeve 53 is prevented by the snap ring 52 and by the engagement of the bearing sleeve 53 with the flange 48.

J
11, that is, it moves to the left in FIG.

Cam collar 58 has an annular portion 59 that rotationally engages earring sleeve 53. This annular portion 59 forms an annular shoulder 60 which is engaged in the same interbeam portion as an annular shoulder 61 formed by an annular flange 62 integral with the bearing sleeve 53. It is clear that it operates to engage this.

The flange 62 is a connecting sleeve, +8 annular part 18b
It has an annular surface 63 which is the same surface as the one shown in FIG.

The camshaft 58 has a large number (only three are shown here) of 64 equally spaced cam structures, as can be clearly seen in the exploded view in Figure 4. Camshaft 65 is secured to annular surface 10b of housing portion 10a. The fixed cam collar 65 has a number of cam structures indicated at 66 equal to the number of cam structures 64. Each cam structure 66 is formed by three stepped cam structures 67, 68, 69. It is clear that when the cam 58 is rotated relative to the fixed cam collar 65, the aforementioned cam structures 64 are sequentially selectively engaged with the fixed cam structures 67, 68, 69.

Three stepped cam structures 67, 68, 69 are cam collars 58
Create three axis positions for. When cam structure 64 is engaged with cam structure 69, continuous rotation of cam collar 58 (from left to right in FIG. 4) causes the cam to move cam collar 58 to the innermost position as shown in FIG. Reposition. "Cam collar 58 ← I, rotate 120 degrees to set three axial positions. Similarly, one rotation of the cam collar 58 is the revealed axial position; Of course, the cam collar 58 is placed in an axial position that utilizes only one cam structure 64 and one stepped feed structure 66, and the device with multiple configurations of cam structures 6, 1.6 Adjust the axis of the cam collar 58 with 'fX: Fast,
To facilitate this, an operator is conveniently provided. The coil spring 56 has a fixed cam 67.68
．． 69 is selectively engaged, and the cam structure G 4 □-'t □
A protective action is added.

The hammer drill of the present invention is shown in FIG. 1 in a hammering i::i' operation mode. When the motor of a power tool, ie, a hammer drill, is operated, rotation is transmitted to the support J6. However, the connecting sleeve 〆18
Since the key 49 is not inserted into the keyway 35 of the spindle 28, such rotation is not transmitted to the spindle 28. The operator places a suitable machining tool on the tip of the drill (not shown) in engagement with the workpiece;
When a forward pressure is applied to this machining tool, the spindles 28 and 1ηbl 6 are moved inwardly against the force of the coil spring 30 so as to engage the ratchet teeth 21, 22 with each other, and so on. Create a hammer action. As this ratchet tooth 2[ rotates together with the shaft 16, such a hammering action occurs. Ratchet tooth 21.
22 is preferably symmetrical in shape so as to provide a ratcheting or hammering function regardless of the direction of rotation of the annular ratchet structure J9 relative to the fixed annular ratchet structure 23.

As previously mentioned, in the hammering mode of operation, the grinding:
It is desirable to have a means for preventing the spin 1-wheel 28 from rotating due to ear rings 32. For this purpose, the coupling sleeve 48 is provided with a series of annular locking teeth or capture structures 7° formed on the front annular surface of the housing portion 10a. These teeth or catch features 70, 71 have a suitable shape, for example the same shape as the ratchet teeth 2, 22. This tooth or capture structure 7o, 71 prevents the rotation of the coupling sleeve 48, which in turn prevents the rotation of the svino dollar due to the engagement of the key 50 and the keyway 37. In the striking operating mode, the cam structure 64 of the cam collar 58 is engaged with the fixed cam 67, thereby placing the cam collar 58 in the innermost !1fl1 position marked IQl! in FIG.
If it is desired to modify the hammer drill to provide hammer and drill functionality, the force collar 58 is rotated and advanced forward until the cam structure 671 is secured in contact with the fixed cam 68. This causes the cam collar to advance forward to the extent fδ shown in Figure 2 from '-1. φ of this cam collar 58: Towards the front of the gyrus: l
+ causes a corresponding axial movement of the connecting sleeve 480, thereby placing the key 49 in the keyway j35. Here, it is clear that the coupling is such that rotation of the shaft 1G results in a rotation of the spindle 28. Of course, the connecting sleeve 4
8 keys 50 are always placed in the keyway 37 of the spindle part 36. The spin bill 28 and chuck 40 are now rotated and the simultaneous hammering action occurs in the same manner as described for the hammering mode of operation.

Now, if rotation-only operation is desired, the cam collar 58 is again rotated and the cam 69 with the cam structure 64 fixed.
Together with the position jj, :l stir. This advances cam collar 58 to its most forward position, thereby causing coupling sleeve 48 to advance to its most forward position.
It conveys the corresponding forward axis movement. Annular surface 48b, 6
9 is provided with a space between the washer 42 and the washer 42 . Operation 7
When a person presses a movable crab tool, ie, a hammer drill, onto a workpiece, the Wannon ear 42 is pressed against the annular surface 48b, at a ratio of 6:3.
contact, thereby inhibiting further axial movement of the spindle portion 28 and sleeve 16 relative to the housing of the hammer drill, and in turn inhibiting engagement of the ratchet teeth 2I, 22 with each other. Therefore, the rotation is only in the chuck 40 (2C1 times); - As is clear from the above explanation, the present invention has an operation mode for hitting with a hammer, an operation mode for drilling a hole, and/or an operation mode for drilling a hole. It has the advantage that the operation mode of the combination of drills can be selectively selected, and the operation of this movable knife, that is, the hammer drill, is easy and easy to understand.

[Brief explanation of drawings]

FIG. 1 shows a movable crab tool, that is, a hammer, in which the present invention is implemented.
- side view, partially in section, of a part of the drill, with the parts in hammering mode F; Fig. 2 is a partial sectional view of the hammer 1-drill shown in Fig. There is. Figure 3 (cross-sectional view along gland 3-3 in Figure 1, Figure 4)
FIG. 2 is a developed plan view of a cam structure for positioning a cam collar in its axial direction. 10... Housing outer shell body 11... Drive shaft 1; 3
...S:/Gugia 17.32...Earring Sleep 21.22...Ratchet 24...Housing Freight 28...Shi0nt 9
Le 35...Key groove 36.38...Cylindrical part 48...
Connection sleeve 58...Ka, collar 6...Cam collar 67, 68.69...Cam right 14,; = ; Ni 7′ ~

Claims (1)

[Claims] A hammer drill of a type that selects a hammering mode, a drilling mode, and a hammer and drill mode, comprising a rotatably provided pp; 1 member C (8); A second member (281) is provided rotatably with respect to the first part (Oc38) together with the first part, and a motor of a hammer drill is connected to the second member (28) to operate the second member. a rotating drive means;
A second part IAC 181 which is connected to the first member (, ) 8) and connects the first member to the υ-th cutting tool, is connected to the driving means, and is connected to the second part IAC181. and a hammer means comprising a first hammer element and a second hammer element that rotate integrally with respect to a second hammer element; The first hammer element and the second... A connecting sleeve (48) that slides axially relative to the first member (38) and the second member (128) and is coupled to the first member (128) to transmit rotational motion to the first member (38).
), which are respectively provided on the connecting sleeve (48) and the second member (28) and are engaged with the first and second axial positions of the connecting sleeve (48) in response to rotation of the second member (281). to rotate the coupling sleeve (48), thereby defining the drilling mode and the hammer-drill combination mode, respectively;
- a first and a second connecting structure (49, 35) defining a hammering mode by disengaging when the tab (48) assumes a third axial position; and a fixed cam element [F]5); and engages with the fixed cam element (65) to rotate the rotating cam element (581).
The rotating cam element (581) is connected to the connecting sleeve (48), and the rotating cam element side moves in the 11+ direction according to the rotation of the connecting sleeve (example 1). and means for causing an axial movement relative to and integral with the coupling sleeve so as to operate without moving to the first, second, and third axial positions. A sleeve (48) is connected to the first
The connecting sleeve ( This hammer drill is characterized in that 481 is positioned by a thrust A'4 structure (42).