DE20307963U1 - C-shaped locking ring for ratchet spanner fits in grooves in casing and in toothed ring which cooperates with spring-loaded pawl - Google Patents

Abstract

The C-shaped locking ring (40) fits into a groove (34) in the toothed ring (30). Fine teeth (311) on the outside of the ring engage with teeth on a pawl (50) with a spring connecting it to a direction selection lever (60). This lever fits in a bore (23) in the casing (20), to one side of the main bore (21) for the toothed ring.

Description

♦ ··

C-shaped locking ring for ratchet wrench Technical area

The invention relates to a C-shaped locking ring for
Ratchet wrench.

State of the art

Figure 5 shows a conventional C-shaped locking ring for ratchet wrenches, which engages on the one hand in an annular groove of the gear ring and on the other hand in an annular groove of the ratchet head and through which the gear ring can be securely held in the ratchet head. This conventional C-shaped locking ring has the following disadvantages:

1. During assembly, the C-shaped locking ring may be deformed by the edge of the receiving space of the ratchet head, which means that a tight fit in the two ring grooves cannot be guaranteed, so that the effect of the C-shaped locking ring to stabilize the gear ring is reduced.

2. If the dimension of the C-shaped locking ring is larger than that of the ring grooves, smooth rotation of the ring gear may be affected.
3. If the C-shaped locking ring has a larger dimension

the assembly is also made more difficult.
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Object of the invention

The invention is based on the object of creating a C-shaped locking ring for ratchet wrenches, which facilitates assembly and has the effect of stabilizing

of the gear ring.

This object is achieved according to the invention in that the ratchet head of the ratchet wrench has a first, second and third receiving space for receiving a gear ring, a pawl and a switch, wherein the first receiving space is provided with a shoulder on the upper side and with an annular groove on the lower side, wherein an inclined guide surface is provided on the annular groove through which the C-shaped locking ring can slide into the annular groove so that a tight fit can be ensured.

Short description of the drawings
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Figure 1 shows an exploded view of the

ratchet wrench according to the invention. Figure 2 shows a partial view of the ratchet head. Figure 3 shows a sectional view of the ratchet head. Figure 4 shows another embodiment of the

Invention.
Figures 5 to 7 show the sectional views of the conventional solution.

Detailed description of the implementation examples

Referring to Figure 1, the ratchet wrench according to the invention essentially consists of a main body (20) which has a ratchet head at one end. 30

The ratchet head has a first receiving space (21) which is provided with a shoulder (211) on the top and an annular groove (212) on the bottom. The third receiving space (23) is located next to the first

Receiving space (21) and is connected to it via a second receiving space (22).

A changeover switch (60) is accommodated in the third receiving space (23) and a pawl (50) is accommodated in the second receiving space (22). The pawl (50) has a toothed segment on one side.

A gear ring (30) is accommodated in the first receiving space (21) and has an inner surface (32) and an outer surface (33). The inner surface (32) is multi-edged and can enclose a nut. The outer surface (33) forms a toothing (311) which engages with the tooth segment of the pawl (50).

The toothing (311) has a first and a second side (312, 313). On the first side (312) a collar

(31) with a smaller diameter. The collar

(31) can be attached to the shoulder (211) of the first receiving space

(21), whereby the gear ring (30) is locked in the first receiving space (21).

On the second side (313) of the toothing (311) an annular groove (34) is provided into which a C-shaped ring (40) can engage.

Accordingly, the first receiving space (21) has an inclined guide surface (2121) on the annular groove (212), which extends from a shoulder (2122) to the annular groove (212). During assembly, the C-shaped locking ring

(40) is first pressed into the ring groove (34) of the gear ring (30). The gear ring (30) is then inserted into the first receiving space (21), whereby the collar (31) of the gear ring (30) rests against the shoulder (211) of the receiving space (21). The C-shaped

Locking ring (40) can slide through the inclined guide surface (2121) into the annular groove (212) of the first receiving space (21). This prevents the gear ring from fluctuating in the first receiving space, as shown in Figure 3. The C-shaped locking ring (40) can have a dimension that is smaller than or equal to the dimension of the annular groove (212).

As can be seen from Figure 4, due to the difficulty of machining the inclined guide surface (2121), the annular groove (34) of the gear ring (30) and the annular groove (212) of the first receiving space (21) can be arranged offset, between which there is an overlap space in which the C-shaped locking ring (40) is received, whereby a fluctuation of the gear ring (30) can be avoided.

Furthermore, the bevel or the inclined guide surface can adjoin a flat surface (2123).

Claims (3)

1. C-shaped locking ring for ratchet wrenches, the ratchet wrench essentially consisting of a main body ( 20 ) having a ratchet head at one end, which
a first receiving space ( 21 ) which is provided on the underside with an annular groove ( 212 ),
a switch ( 60 ) accommodated in a third receiving space ( 23 ),
a pawl ( 50 ) which is accommodated in a second receiving space ( 22 ) and has a toothed segment on one side,
a gear ring ( 30 ) which is accommodated in the first receiving space ( 21 ) and has an inner surface ( 32 ) and an outer surface ( 33 ), wherein the inner surface ( 32 ) is multi-edged and can enclose a nut, and the outer surface ( 33 ) forms a toothing ( 311 ) which engages with the tooth segment of the pawl ( 50 ), and wherein the gear ring ( 30 ) has an annular groove ( 34 ) at the lower edge, and
a C-shaped locking ring ( 40 ) which is received in the annular groove ( 34 ) of the gear ring ( 30 ) and in the annular groove ( 212 ) of the first receiving space ( 21 ), wherein an inclined guide surface ( 2121) is provided on the annular groove (212 ) , through which the C-shaped locking ring ( 40 ) can slide into the annular groove ( 212 ) so that a tight fit can be ensured. 2. C-shaped locking ring according to claim 1, characterized in that the annular groove ( 34 ) of the gear ring ( 30 ) and the annular groove ( 212 ) of the first receiving space ( 21 ) can be arranged offset, between which there is an overlapping space in which the C-shaped locking ring ( 40 ) is received, whereby a fluctuation of the gear ring ( 30 ) can be avoided. 3. C-shaped locking ring according to claim 1, characterized in that the bevel ( 341 ) or the inclined guide surface ( 2121 ) adjoins a flat surface (2123).