JPH0713987Y2 - Breaker mating bracket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mating bracket that prevents the breaker from swinging in the front-rear direction during a striking operation.

(Prior Art) A large breaker needs to be attached to a bracket for mounting on various types of self-propelled carriages. When the breaker is mounted on a bracket having an integral structure, the breaker is held in the vertical direction by a fitting groove, but there are gaps in the left-right direction and the front-back direction, and rattling and wear are likely to occur during operation of the breaker. On the other hand, when the breaker is attached to the mating type bracket, it is possible to reduce rattling and wear in the left-right direction during operation because the framer is tightened by a plurality of bolts in the left-right direction as well as the up-down direction. However, in the front-rear direction of the breaker, the breaker is merely held by the rectangular front frame portion held by the front bolt, and a considerable gap remains between the front frame portion and the breaker. For this reason, in Japanese Utility Model Laid-Open No. 56-132081, a breaker is strongly pressed toward the front frame portion by a plurality of push bolts, and the breaker is fixed to the front frame portion without a gap. There is also a bracket having a structure in which projecting stoppers are formed in the front and rear of both frame plates of the bracket, and the breaker is fixed in the front-rear direction by these stoppers.

(Problems to be solved by the invention) In a mating type bracket, if a gap remains in the front-rear direction between the front frame portion and the breaker, rattling occurs in the front-rear direction when the breaker operates. Even if a plurality of push bolts are installed between narrow frame plates as in Japanese Utility Model Laid-Open No. 56-132081, it is difficult to fasten the bolts and it is difficult to put them into practice. On the other hand, in the case of forming the protruding stoppers on the front and rear sides of the inner side of both frame plates of the bracket, the cost is high because the processing of the bracket requires considerable accuracy, and the disassembling and assembling at the work site is impossible. Therefore, it cannot be applied to the civil engineering and construction industry, which requires prompt response on site.

The gap in the front-rear direction of the mating bracket generally has a difference of 1 to 2 mm between the diameter of the front bolt and the inner diameter of the bolt hole of the frame plate, so it is meaningless to increase only the machining accuracy of the bracket. Even if the processing accuracy is increased, disassembly and assembly at the work site becomes impossible as described above. Even in the case of a mating bracket, the front bolt is configured to tighten the front frame part and the breaker at the same time.Therefore, the front frame part and the breaker lateral width need to be the same. The width of either one becomes slightly narrower. Therefore, no matter how much the front bolt is tightened, the front bolt can only be pressed down by a slight frictional force, and a left-right gap is formed in the breaker body or the front frame portion in a short period after the start of operation. Currently, a problem at the work site is rattling in the front-rear direction during operation of the breaker due to the gap in the front-rear direction remaining between the bracket and the breaker, which is accompanied by rattling in the up-down direction and the left-right direction. It is to generate wear.

The present invention has been proposed to improve the above-mentioned problems associated with a conventional bracket attached to a breaker. By suppressing rattling in the front-rear direction that occurs early after the start of operation, the present invention is not limited to the front-rear direction. It is an object of the present invention to provide a mating bracket that can suppress rattling and wear in the direction and the left-right direction.

(Means for Solving the Problem) In order to achieve the above object, the mating bracket 2 according to the present invention has a plurality of breaker rectangular main bodies 6 vertically sandwiched between a pair of frame plates 4, 4. Tighten with bolts 8 and 9.
The front frame portion 10 held by the front bolt 8 is provided with a generally rectangular cushioning member 12 as shown in FIGS. 3 and 4, and the entire lateral width of the front frame portion 10 including the cushioning member is not tightened. It is larger than the lateral width of the breaker body 6 at the tightened position, and is substantially equal to the lateral width of the breaker body 6 when tightening bolts. Also, the rear frame portion 14 held by the back bolt 9
Also, as shown in FIG. 6, a generally rectangular cushioning member may be provided like the front frame portion 10, and the cushioning member 12 is made of, for example, urethane resin, hard rubber or felt sheet having high compressive strength. preferable.

The front frame portion 10 is, for example, a rectangular stay having a central through hole 15.
It has a cover 18 of U-shaped cross section in which 16 is welded in the center (see FIG. 5). The rectangular cushioning members 12 provided with the central through holes 20 (Fig. 4) are arranged on both sides of the stay 16 to cover them.
It is covered with 18, and is held between the pair of frame plates 4 and 4 by the front bolts 8 which are passed through the cushioning members 12 and 12 and the through holes 15 and 20 of the stay 16. As shown in FIGS. 7 and 8, the front frame portion may be formed by covering one rectangular cushioning member with a cover having a U-shaped cross section and holding the cover by the rectangular metal fittings 22, 22 at both ends.

(Operation) In the mating bracket 2 according to the present invention, the cushioning member
The entire width of the front frame portion 10 including 12, 12 is larger than the lateral width of the breaker body 6 in the tightened position when not tightened, and the cushioning members 12, 12 are set so as to be substantially equal to the lateral width of the breaker body 6 when tightened by bolts. Compress axially. As a result, expansion of the cushioning members 12, 12 in the peripheral direction pushes in the breaker body 6, and contraction of the through hole 20 of the cushioning member pushes in the front bolt 8, which causes the bolt holes of the frame plate 4 to swing. By suppressing the spread of the breaker, the breaker is prevented from swinging in the front-back direction.

(Embodiment) The present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show a mating bracket 2 according to the present invention, which comprises a pair of frame plates 4, which are substantially right triangle planes.
Having 4. Behind the plates 4,4 are two pin holes 24,26
Is provided and the breaker is mounted by being connected to the arm and bucket link of a work carriage (not shown) through the pin hole. At the inner front side of the frame plate 4, three rows of horizontal projections 28, 30, 32 are respectively formed from above, and the projections 28 and 30 have the same height, and the lower projection 32 is the highest. The front frame portions 10 are arranged at the front end portions of the horizontal protrusions 28, 30, 32, respectively, and the rear frame portion 14 is located at the rear end portions thereof. Therefore, the bracket 2 includes three front frame portions 10, which are substantially the same except for some dimensional differences. However, it is also possible to directly contact the frame plate with the breaker body 6 without forming these protrusions inside the frame plate.

As shown in FIG. 5, the front frame portion 10 held by the front bolt 8 has a cover 18 having a U-shaped cross section in which a rectangular stay 16 having a central through hole 15 is welded in the center. A rectangular cushioning member having a central through hole 20 (FIG. 4) on both sides of the stay 16.
12 are respectively arranged so that the cushioning members 12 and 12 are covered with a cover 18 except for the front portion, and the cushioning members are generally made of urethane resin. When the bolt 8 is not tightened,
As shown in FIG. 3 (1), the lateral width of the front frame portion 10, that is, the total length of the stay 15 and the cushioning members 12, 12 is larger than the lateral width of the breaker body 6 at the fastening position. Further, as shown in FIG. 4 (1), the outer size of the buffer member 12 is slightly smaller than the inner size of the cover 20, and the inner diameter of the through hole 20 of the buffer member is slightly smaller than the diameter of the front bolt 8. large.

On the other hand, the rear frame portion 14 held by the back bolt 9 is illustrated in FIG. In the upper rear frame portion 14a, a rectangular cushioning member 36 is arranged between the sleeves 34 welded to the rear end portion of the inner protrusion 28. In the lower rear frame portion 14b, square cushioning members 40, 40 are arranged between the sleeves 38 welded to the rear end portion of the inward protrusion 32, and the lower end stay 44 of the protective cover 42 (Fig. 2) is arranged between the cushioning members. Is located. In addition to the lower end stays 44, bolts 46 penetrate the stays 43 welded to the upper ends of the protective covers 42 to hold the covers below the frame plates 4, 4. Further, the central rear frame portion 47 is composed of a stay 48 welded to the rear end portion of the inner protrusion 30. The cushioning members 36 and 40 are made of urethane resin as described above. The rear frame part when the bolt 9 is not tightened
The lateral width of 14a, that is, the total length of the sleeves 34, 34 and the cushioning member 36, and the lateral width of the rear frame portion 14b, that is, the total length of the sleeves 38, 38, the cushioning members 40, 40, and the stay 44, are determined at the tightening position. It is larger than the width of the breaker body 6.

When the breaker is attached to the bracket 2, the fitting groove of the breaker body 6 is fitted into the protrusions 32, 32, and the side wall of the breaker body 6 is brought into contact with the protrusions 28 and 30. Bolt 8,9
When not tightened, the front frame portion 10 and the rear frame portion 14 are larger than the lateral width of the breaker body 6 in the tightened position, and it is easy to sandwich the breaker body between the frame plates 4, 4 of the bracket 2. Next, tighten the bolts 8 and 9 to remove the front frame 1
At 0, the buffer members 12, 12 are axially compressed as shown in FIG. 3 (2), and the length of the front frame portion becomes substantially equal to the lateral width of the breaker body 6. The cushioning members 12, 12 cover the U-shaped section 18
Therefore, the expansion of the cushioning member in the peripheral direction is mainly directed toward the breaker body 6 (see FIG. 4 (2)), and thereby the breaker body 6 is pressed. At this time, since the cushioning member 12 has a tendency to protrude outward from the gap between the front end of the cover 18 and the breaker body 6, the front end inner side 18a of the cover is chamfered as shown in the figure, and the cushioning member 12
It is preferable to chamfer the corner 12a of the breaker contact surface. Further, the contraction of the through holes 20 of the cushioning members 12, 12 presses the front bolt 8 to prevent the bolt hole of the frame plate 4 from expanding due to the swing of the bolt, thereby swinging the breaker in the front-back direction. To prevent. On the other hand, the rear frame portion 14
In a and 14b, the cushioning members 36 and 40, 40 are compressed in the axial direction, so that the cushioning members expand in the peripheral direction and hold down the breaker body 6. In the lower rear frame portion 14b, the cushioning member 40,
Pressing the stay 44 by compressing 40, the protective cover 42 to the frame plate
Hold it between 4 and 4.

7 and 8 show a modified example of the front frame portion used in the present invention. The front frame portion 50 is a rectangular metal fitting 2 having through holes 51 at both ends thereof.
Has 2,22. Square-shaped cushioning member 54 provided with a central through hole 52
Is covered with a cover 56 having a U-shaped cross section, the cover 56 is longer than the buffer member 54 even when the front bolt shown in FIG. 8 is not tightened, and both ends of the cover are U-shaped provided on the inner wall of the rectangular metal fitting 22. Fit into the groove 58. The lateral width of the front frame portion 50, that is, the total length of the buffer member 54 and the rectangular metal fittings 22, 22 is larger than the lateral width of the breaker body at the tightening position, and the outer dimension of the buffer member 54 is slightly smaller than the inner dimension of the cover 56. The inner diameter of the through hole 52 of the buffer member is slightly larger than the diameter of the front bolt. When you tighten the front bolt, the front frame 50
The cushioning member 54 is compressed in the axial direction as shown by the one-dot chain line in the figure, and the length of the front frame portion becomes substantially equal to the lateral width of the breaker body. At this time, both ends of the cover 56 are further inserted into the U-shaped groove 58 of the rectangular metal fitting 22, but the end surface of the cover is not grooved.
Do not touch the bottom wall of 58. Since the cushioning member 54 is covered with the cover 56, the expansion of the cushioning member in the peripheral direction is mainly pushed toward the breaker body to press the breaker body, and the through hole 52 of the cushioning member contracts to swing the front bolts. The expansion of the bolt holes of the frame plate due to is suppressed.

(Advantages of the Invention) In the mating bracket according to the present invention, the buffer member is axially compressed so that the lateral width of the breaker body is approximately equal when the bolt is tightened. The front bolt is pressed down by pressing down and contracting the through hole of the buffer member. As a result, the front-to-back clearance between the mating bracket and the breaker body is eliminated, swinging in the front-to-back direction during operation of the breaker is prevented, and rattling in the up-and-down and left-and-right directions that accompany rattling in the back-and-forth direction. Prevents sticking and wear. Moreover, since the bracket of the present invention does not require high processing accuracy, it does not cost much and can be disassembled and assembled at the work site, so it can be sufficiently applied to the civil engineering and construction industry that requires prompt response on site. .

[Brief description of drawings]

FIG. 1 is a front view showing a part of the mating bracket according to the present invention with a part cut away, FIG. 2 is a side view showing a part of the bracket shown in FIG. 1 with partly cut out, and FIGS. 3 (1) and 3 (2). Is a plan view of the front frame portion used in the present invention, and FIGS. 4 (1) and 4 (3) are third views.
Sectional view of the essential part taken along the line IV-IV in FIG.
FIG. 6 is a perspective view of a cushioning member cover used in the front frame portion, FIG. 6 is a rear view showing the protective cover of the bracket of FIG. 1 cut away, and FIGS. 7 and 8 are perspective views showing a modified example of the present invention. It is a figure and a sectional view. 2 …… Mating bracket, 4,4 …… Frame plate, 6…
… Breaker body, 8 …… Front bolt, 9 …… Back bolt, 10 …… Front frame, 12,12 …… Cushioning member, 14 …… Rear frame, 15 …… Center through hole, 16 …… Rectangular stay , 18 …… Cover, 20 …… Center through hole, 22,22 …… Rectangular metal fittings.

Claims (4)

[Scope of utility model registration request] 1. A mating bracket for fastening a pair of frame plates with a plurality of bolts, wherein a front frame portion held by front bolts is provided with a rectangular cushioning member projecting rearward from a rear end surface thereof. The rear side surface of the shock-absorbing member contacts the front side surface of the breaker, and the horizontal width of the entire front frame portion including the shock-absorbing member is larger than the horizontal width of the breaker main body at the tightening position when not tightened, and is almost the same as the horizontal width of the breaker main body when tightening the bolt. A breaker mating bracket for axially compressing the cushioning member so that the breaker body is pressed by peripheral expansion of the cushioning member to prevent the breaker from swinging in the front-rear direction. 2. The bracket according to claim 1, wherein the rear frame portion held by the back bolt is also provided with a buffer member, and a front side surface of the buffer member contacts a rear side surface of the breaker. 3. The bracket according to claim 1, wherein the cushioning member is made of urethane resin, hard rubber or felt sheet having high compressive strength. 4. A rectangular U-shaped cross section welded to a rectangular stay having a central through hole is provided, and rectangular shock absorbing members having a central through hole are arranged on both sides of the stay and covered with the covers. A front frame portion for a bracket which is held between a pair of frame plates by a front bolt that passes through a through hole of a cushioning member and a stay.