JPH042165Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a spring clip for a rail fastening device.

(Prior Art) Figures 9 to 12 show a conventional spring clip, in which an upper piece 2' extends from the rear end curved part 1', and a lower piece 3' has an inverted L-shaped rising piece 3'a at the tip. are extended, and the upper and lower pieces 2' and 3' have bolt holes 4' and 3', respectively.
5' is drilled.

FIG. 13 shows a rail fastening device using the spring clip, where 6' is the rail, 7' is the rail pad,
Reference numeral 8' indicates a rail fastening bolt that passes through the bolt holes of the upper and lower parts of the spring clip and is screwed into an embedded plug 10' embedded in the sleeper 9', and 11' supports the curved portion 1' of the spring clip. The insulating buffer 12' is a washer, and by crimping the A part of the upper piece 2' of the spring clip from above with the bolt 8',
The rail is elastically fastened by the tip of the inverted L-shaped rising portion 3'a of the lower piece 3'. (See Fig. 13) (Problems to be solved by the invention) When trying to increase the fastening force at the bottom of the rail using the conventional spring clip, the mechanical model shown in Figs. 14 to 16 Then, lower piece 3'
The insulating buffer 11' and the arm length L between the supports B and C at the bottom of the rail 6' are made sufficiently long, and the spring thickness is made sufficiently thick to withstand the bending moment generated thereby. There is a need to.

However, in actual design, the curved portion of the inverted L-shaped rising piece 3'a in the spring clip is
Second, it is necessary to provide a sufficient radius of curvature γ corresponding to the wall thickness of the spring clip, resulting in an enlarged or complicated shape.

Further, when the rails are fastened using the spring clips, forces as shown in FIGS. 14 to 16 act. In the figure, T is the bolt tightening force, Fl is the force borne by the tip of the lower piece 3' among the forces acting on the tip of the spring clip, and Fu is the force borne by the tip of the upper piece 2'. In such a spring clip, the spring constant is extremely low when the bolt tightening point A of the upper piece 2' corresponding to Fl and the fulcrum point B of the lower piece 3' due to the insulating cushioning material are fixed fulcrums, but the spring constant corresponds to Fu. The spring constant is AB
Since the point and point C at the tip of the lower piece 3' serve as fixed points, it is extremely high, and the bending stress generated at point A is also generally low. Conversely, the spring constant at point C of the spring clip's tip rail holding position (in this case, it is the sum of the spring constants corresponding to Fl and Fu)
In order to make the spring clip as small as possible and to obtain a sufficiently large amount of deflection at the tip of the spring clip, it is necessary to make the spring clip as small as possible so that the spring action of the upper piece 2' is generated as much as possible. This is necessary in order to obtain sufficient fastening force and sufficient pressing amount (deflection amount) of the tip of the spring clip.

(Means for Solving the Problems) The present invention was proposed in view of the above-mentioned circumstances, and includes an inverted L-shaped rising portion that engages with the side edge of the bottom of the rail at the tip from the semicircular curved portion at the rear end. In a rail fastening spring clip configured such that a lower piece having a strip and an upper piece for pressing the rail bottom are extended, and a rail fastening bolt is inserted through both the upper and lower pieces, the upper piece A fan-shaped opening whose width gradually increases as it reaches the tip is cut out in the center, and a pair of tapered arms are formed on both sides of the upper part, and the thickness of each arm gradually decreases as it reaches the tip. The purpose of the spring clip is to create an improved spring clip for a rail fastening device that uses leaf springs of the same thickness, is small in size, has sufficient rail fastening force, and has a sufficient amount of tip deflection. Another object of the present invention is to provide a spring clip for fastening rails.

(Function, effect of the invention) As mentioned above, in the present invention, a fan-shaped opening whose width gradually increases as it reaches the tip is cut out in the center of the upper piece of the spring clip, and a pair of tapered openings are formed on both sides of the opening. Since the arm is provided, the amount of deflection of the upper piece when bending force is applied is increased. By tightening the rail fastening bolts, the distance between the tips of the upper and lower pieces is reduced, and the pair of tapered arms provided on both sides of the sector opening in the upper piece are connected to the tips of the lower piece. A bending moment and a torsional moment act upon contact with the upper end, and a bending moment occurs at the tip of the upper piece due to the bending moment and torsional moment. Furthermore, by providing a fan-shaped opening in the upper piece that gradually increases in width as it reaches the tip, the allowable stress limit is set to the combined stress of bending stress and torsional stress occurring at the tip.
Acts uniformly on the entire top piece. In this way, due to the fastening action of the rail fastening bolts, a large stress is generated evenly on the upper piece, which does not generate much stress until the upper end comes into contact with the lower end, when the bolts are fastened, and the spring The elastic energy of the entire clip is accumulated to the maximum, and as a result, the amount of deflection of the tip of the spring clip that presses against the rail bottom piece is increased without changing the plate thickness of the clip, and a small and sufficient rail fastening force is achieved. It is something that can be brought to bear.

Moreover, in the present invention, since the plate thickness of the tapered arm gradually decreases as it reaches the tip, the bending that occurs at the tip of the arm due to the bending moment increases, and as a result, the rail fastening spring It is possible to design a clip with a large amount of deflection at the tip.

(Example) The present invention will be described below with reference to the illustrated embodiments.

As shown in FIGS. 1 to 4, an upper piece 2 and a lower piece 3 extend forward from the upper and lower ends of the semicircular curved part 1 at the rear end of the spring clip, respectively.
An inverted L-shaped rising portion 3a is curved at the tip. 4 in the figure is a bolt hole for rail fastening.

The upper piece 2 is cut out with a fan-shaped opening 5 whose width gradually increases as it reaches the tip, and a pair of tapered arms 6, 6 are formed on both sides of the opening 5.
The thickness of each arm 6 is gradually reduced toward the tip.

FIG. 5 shows the state in which the spring clip is used;
Reference numeral 7 denotes a rail fastening bolt that passes through the opening 5 of the upper piece 2 and the bolt hole 4 of the lower piece 3, and is screwed into an embedded plug 9 embedded in the sleeper 8. Reference numeral 10 denotes a rail, and the inverted L-shaped rising portion 3a of the lower piece 3 is engaged with the bottom side edge of the rail. 11
1 is a rail pad, 12 is a washer, and 13 is an insulating buffer material.

In the rail fastened state, loads as shown in FIGS. 6 to 8 are applied. _T1 is the force received from the bolt 7 via the washer 12, that is, the component force of the bolt fastening force, _F1 is the force that the tip arm 6 of the upper piece 2 receives from the inverted L-shaped rising piece 3a at the tip of the lower piece 3, _F2
are the forces that the rising piece 3a receives from the top surface of the bottom of the rail 10, and these forces act on the spring clip.
Note that e is the eccentricity in the s-s direction (see Figure 6) parallel to the rails of F ₁ and T ₁ , and l is the distance between the z-z direction perpendicular to the rails of T ₁ and F ₁ . When the above-mentioned forces act, the gap δ ₁ between the tips of the upper and lower pieces 2 and 3 of the spring clip is reduced by the tightening force of the bolt 7, and the arm 6 comes into contact with the inverted L-shaped rising piece 3a. do.

Further, by tightening the bolt 7, the force is increased.
F ₁ is generated, and a bending moment 2F ₁・l is generated in the upper piece 2.
and torsional moment 2F ₁・e act, and the upper piece 2
A deflection δ ₃ due to the bending moment of the former and a deflection δ ₂ due to the torsion moment of the latter occur at the tip of the arm 6 in .

Since the thickness of the tapered arm 6 gradually decreases toward the tip, the deflection δ ₃ generated at the tip of the arm 6 due to the bending moment 2F ₁ ·l increases, and this As a result, the total amount of deflection δ in the same part
= δ ₁ + δ ₂ + δ ₃ increases. That is, the stress of the spring clip is such that the tip of the arm 6 in the upper piece 2
Until it comes into contact with the inverted L-shaped rising piece 3a at the tip of
A relatively large stress is generated at the rear end point B, but almost no stress is generated at the point A of the bolt clamping portion.
Furthermore, by tightening the bolt 7, a large stress is evenly generated in the upper piece 2, where almost no stress has been generated up to that point, and it becomes possible to maximize the elastic energy of the entire spring clip. Therefore, it is possible to design a spring clip that allows a large amount of deflection at the tip of the spring clip that presses against the bottom of the rail.

Further, in the above embodiment, after the upper piece 2 is fastened until the tip of the arm 6 completely lightly contacts the tip of the inverted L-shaped rising piece 3a of the lower piece 3, the above-mentioned δ ₂ +
Further tighten so that a deflection corresponding to δ ₃ occurs.
This regulation can be performed by changing the rotation angle of the bolt 7 after the above-mentioned contact.

Further, although the side edge of the opening 5 is formed in a straight line, it may be formed into a tapered shape in the form of a curved line in consideration of the stress state.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the spring clip for a rail fastening device according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a plan view thereof, and Fig. 4 is a front view thereof.
Figure 5 is a side view showing its operating condition, Figures 6, 7, and 8 are a slope view, side view, and front view showing its operating condition, respectively, and Figure 9 is a conventional rail fastening device. 10 is a side view, FIG. 11 is a plan view, FIG. 12 is a front view, FIG. 13 is a side view of the spring clip in use, and FIGS. 14 and 15 as well as FIG. 16 is a perspective view, a side view, and a front view, respectively, showing the operating state thereof. DESCRIPTION OF SYMBOLS 1... Semicircular curved part, 2... Upper piece, 3... Lower piece, 3a... Inverted L-shaped rising piece, 5... Fan-shaped opening, 6... Arm.

Claims (1)

[Scope of utility model registration request] A lower piece having an inverted L-shaped rising piece at its tip that engages with the side edge of the rail bottom, and an upper piece for pressing the rail bottom extend from the rear semicircular curved portion, and both of the upper and lower pieces In a rail fastening spring clip configured such that a rail fastening bolt is inserted through the top piece, a fan-shaped opening whose width gradually increases as it reaches the tip is cut out in the center of the top piece, and a fan-shaped opening is cut out on both sides of the top piece. A spring clip for a rail fastening device, characterized in that it forms a pair of tapered arms, and the plate thickness of each arm gradually decreases as it reaches its tip.