EP1136186A2 - Pawl for a ratchet-type spanner - Google Patents
Pawl for a ratchet-type spanner Download PDFInfo
- Publication number
- EP1136186A2 EP1136186A2 EP00122394A EP00122394A EP1136186A2 EP 1136186 A2 EP1136186 A2 EP 1136186A2 EP 00122394 A EP00122394 A EP 00122394A EP 00122394 A EP00122394 A EP 00122394A EP 1136186 A2 EP1136186 A2 EP 1136186A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ratchet
- hole
- pawl
- teeth
- ratchet gear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
- B25B13/46—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle
- B25B13/461—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member
- B25B13/462—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member the ratchet parts engaging in a direction radial to the tool operating axis
- B25B13/463—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member the ratchet parts engaging in a direction radial to the tool operating axis a pawl engaging an externally toothed wheel
Definitions
- the present invention relates to a pawl for a ratchet-type spanner to provide reliable ratcheting.
- the ratchet-type spanner includes a handle 1' with a box end 11' for rotatably receiving a ratchet gear 2' that is mounted between a ring-like cover plate 6' and a ledge 8' and retained in place by a C-clip 7'.
- a side of the box end 11' is drilled to form a hole 12' that extends along an axis at an angle of ⁇ (12° ⁇ 18°) with a horizontal axis of the box end 11'.
- a pawl 3' is mounted in the hole 12' and includes ratchet teeth 31' formed on a side thereof for releasably engaging with teeth 21' of the ratchet gear 2' and a compartment 32' defined in the other side thereof.
- a spring 4' is mounted in the compartment 32' for biasing the pawl 3' to engage with the teeth 21'.
- a threaded plug 5' is mounted in the hole 12' and engaged with an inner threading 121' of the hole 12'.
- the plug 5' includes an inner side 51' for retaining the spring 4' and the pawl 3' in place and an outer side with a hexagonal recess 52'.
- the present invention is intended to provide a buckle device that mitigates and/or obviate the above problems.
- a ratchet-type spanner comprises:
- the first end of the pawl includes a beveled face that faces the inner periphery of the slant hole.
- the web includes an inclined indication area for indicating ratcheting direction of the ratchet-type spanner by an inclination direction of the inclined indication area.
- the plug includes at least one knurl formed on an outer periphery thereof, the knurl being in force-fitting engagement with the inner periphery defining the slant hole.
- An inner periphery defining the hole of the box end includes a first annular groove.
- the outer periphery of the ratchet gear includes a second annular groove facing the first annular groove. A C-clip is received in the first annular groove and the second annular groove for rotatably retaining the ratchet gear in the hole of the box end.
- a ratchet-type spanner comprises:
- a ratchet-type spanner comprises:
- a ratchet-type spanner comprises:
- a ratchet-type spanner 10 in accordance with the present invention generally includes a handle 12 and a box end 11 having a hole 111.
- An inner periphery (not labeled) defining the hole 111 of the box end 11 includes an annular groove 112 in a lower portion thereof.
- the annular groove 12 is formed simultaneously when the box end 11 is formed by a cutting tool.
- a web 13 is defined between the box end 11 and the handle 12 and has an inclined indication area 14 for indicating ratcheting direction of the spanner by the inclination direction of the inclined indication area 14.
- a slant hole 15 is defined in the web 13 and includes an inner end communicated with the hole 111 of the box end 11 and an outer end communicated with outside. The slant hole 15 extends along an axis that is at an angle (preferably 18.5°) with a normal to a longitudinal axis of the box end, as shown in Fig. 3.
- a ratchet gear 20 is mounted in the box end 11 and includes an inner periphery 21 for driving a fastener (not shown) and an outer periphery 22.
- the outer periphery 22 includes an upper end portion 23, a lower end portion 24, and a middle portion with a plurality of recessed ratchet teeth 25.
- the lower end portion 24 includes an annular groove 241.
- a C-clip 26 is received in the annular groove 241 of the lower end portion 24 and the annular groove 112 of the box end 11, thereby rotatably retaining the ratchet gear 20 in the box end 11 of the spanner 10, best shown in Fig. 6.
- a substantially cylindrical pawl 30 is mounted in the slant hole 15 in the web 13 and includes ratchet teeth 31 on an end thereof for engaging with ratchet teeth 25 of the ratchet gear 20.
- the end of the ratchet 31 further includes a beveled face 32, which will be described later.
- An elastic member 40 is also mounted in the slant hole 15 in the web 13 and includes an end attached to the other end of the pawl 30.
- the other end of the elastic member 40 is attached to a plug 50 that is securely mounted in the outer end of the hole 15 in the web 13.
- the other side of the pawl 30 has a recess 33 (Fig.
- the plug 50 includes at least one knurl 51 formed on an outer periphery thereof for retaining the plug 50 in place by force-fitting engagement with an inner periphery of the slant hole 15 in the web 13. Tolerance problem in the diameter of the slant hole 15 and the outer diameter of the plug 50 is eliminated by the force-fitting engagement between the knurl 51 and the inner periphery of the hole 15.
- the pawl 30 when not in use, the pawl 30 bears against the slant hole 15 at point A, and the beveled face 32 of the pawl 30 and the inner periphery of the slant hole 15 has a gap therebetween.
- the ratchet teeth 31 on the pawl 30 completely mesh with the concave ratchet teeth 25 of the ratchet gear 20. It is noted that the complete engagement between the teeth 31 and 25 occurs when the slant hole 15 extends along an axis that is at an angle of 18.5° with the normal to the longitudinal axis of the box end 11.
- the slant hole 15 does not extend along an axis that is at an angle of 18.5° with the normal to the longitudinal axis of the box end 11 due to tolerance in the processing precision.
- the slant hole 15 extends along an axis that is at an angle of 20.5° with the normal to the longitudinal axis of the box end 11
- the beveled face 32 of the pawl 30 and the inner periphery of the hole 15 has a gap therebetween.
- the spanner 10 is turned, the ratchet teeth 31 on the pawl 30 are subjected to a force F via transmission of the ratchet teeth 25 of the ratchet gear 20.
- the pawl 30 pivots about point A such that the beveled face 32 of the pawl 10 is in intimate contact with the inner periphery of the hole 15, thereby still providing complete engagement between the teeth 31 and 25.
- Fig. 5 illustrates a comparative example, wherein the pawl 30 has no beveled face 32 while the slant hole 15 extends along an axis that is at an angle of 20.5° with the normal to the longitudinal axis of the box end 11. It is apparent that the ratchet teeth 31 on the pawl 30 cannot engage with the ratchet teeth 25 of the ratchet gear 20 without provision of the beveled face 32 when the spanner 10 is turned. Thus, provision of the beveled face 32 on the pawl 30 may obviate manufacture tolerance of drilling the slant hole 15 in the web 13.
- the ratchet-type spanner in accordance with the present invention includes several advantages. Firstly, the inclined indication area 14 indicates the ratcheting direction of the spanner. Manufacture of the box end 11 is easier and inexpensive by means of directly forming the annular grooves 112 and 241, and the assembly procedure is easier, as the cover 6' and ledge 8' in the conventional design is not required.
- the protrusion 51 of the plug 50 may reliably retain the plug 50 in place and thus retain the pawl 30 and the elastic member 40 in place, and the tolerance problem is also obviated.
- the beveled face 32 of the pawl 30 may obviate manufacture tolerance of drilling the slant hole 15 in the web 13.
Abstract
Description
- The present invention relates to a pawl for a ratchet-type spanner to provide reliable ratcheting.
- Spanners are the best choice for working in a tight area, yet the backlash is too large. Ratchet-type spanners have been proposed to solve this problem and Figs. 7 through 9 of the drawings illustrates a typical design. As illustrated in Fig. 7, the ratchet-type spanner includes a handle 1' with a box end 11' for rotatably receiving a ratchet gear 2' that is mounted between a ring-like cover plate 6' and a ledge 8' and retained in place by a C-clip 7'. A side of the box end 11' is drilled to form a hole 12' that extends along an axis at an angle of (12°~18°) with a horizontal axis of the box end 11'. A pawl 3' is mounted in the hole 12' and includes ratchet teeth 31' formed on a side thereof for releasably engaging with teeth 21' of the ratchet gear 2' and a compartment 32' defined in the other side thereof. A spring 4' is mounted in the compartment 32' for biasing the pawl 3' to engage with the teeth 21'. A threaded plug 5' is mounted in the hole 12' and engaged with an inner threading 121' of the hole 12'. The plug 5' includes an inner side 51' for retaining the spring 4' and the pawl 3' in place and an outer side with a hexagonal recess 52'.
- Nevertheless, position of the plug 5' affects function of the pawl 3'. Namely, the pawl 3' cannot be effectively engaged with the ratchet gear 2' for ratcheting if the plug 5' is too far from the ratchet gear 2'. On the contrary, the pawl 3' will be stuck with the ratchet gear 2' if the plug 5' is too close to the ratchet gear 2'. Optimal positioning of the plug 5' is time-consuming and very difficult to achieve even by a skilled worker. Assembly cost is accordingly increased. In addition, the threading engagement between the plug 5' and the hole 12' tends to wear after a term of use such that the user often has to bond the plug by adhesive or glue. Use of the spanner becomes more inconvenient. In addition, assembly of the spanner is complicate and expensive, as the cover 6' and C-clip 7' are required. Furthermore, formation of the ledge 8' requires expensive and accurate computer-numeric-control (CNC), which further results in an increase in the cost.
- The present invention is intended to provide a buckle device that mitigates and/or obviate the above problems.
- In accordance with a first aspect of the invention, a ratchet-type spanner comprises:
- a handle;
- a box end extended from the handle and having a hole, a slant hole being defined in a web between the handle and the box end and communicated with the hole of the box end;
- a ratchet gear including an inner periphery adapted to drive a fastener and an outer periphery, the outer periphery of the ratchet gear including a plurality of first teeth, the ratchet gear being rotatably mounted in the hole of the box end;
- a pawl mounted in the slant hole and including a first end with a plurality of second teeth for releasably engaging with the first teeth of the ratchet gear, the pawl further including a second end;
- a plug securely mounted in the slant hole by force-fitting engagement with an inner periphery defining the slant hole; and
- an elastic member mounted in the slant hole and having a first end attached to the second end of the pawl and a second end attached to the plug for biasing the second teeth of the pawl to engage with the first teeth of the ratchet gear.
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- The first end of the pawl includes a beveled face that faces the inner periphery of the slant hole. The web includes an inclined indication area for indicating ratcheting direction of the ratchet-type spanner by an inclination direction of the inclined indication area. The plug includes at least one knurl formed on an outer periphery thereof, the knurl being in force-fitting engagement with the inner periphery defining the slant hole. An inner periphery defining the hole of the box end includes a first annular groove. The outer periphery of the ratchet gear includes a second annular groove facing the first annular groove. A C-clip is received in the first annular groove and the second annular groove for rotatably retaining the ratchet gear in the hole of the box end.
- In accordance with a second aspect of the invention, a ratchet-type spanner comprises:
- a handle;
- a box end extended from the handle and having a hole, a slant hole being defined in a web between the handle and the box end and communicated with the hole of the box end, the web including an inclined indication area for indicating ratcheting direction of the ratchet-type spanner by an inclination direction of the inclined indication area;
- a ratchet gear including an inner periphery adapted to drive a fastener and an outer periphery, the outer periphery of the ratchet gear including a plurality of first teeth, the ratchet gear being rotatably mounted in the hole of the box end;
- a pawl mounted in the slant hole and including a first end with a plurality of second teeth for releasably engaging with the first teeth of the ratchet gear, the pawl further including a second end;
- a plug securely mounted in the slant hole; and
- an elastic member mounted in the slant hole and having a first end attached to the second end of the pawl and a second end attached to the plug for biasing the second teeth of the pawl to engage with the first teeth of the ratchet gear.
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- In accordance with a third aspect of the invention, a ratchet-type spanner comprises:
- a handle;
- a box end extended from the handle and having a hole, a slant hole being defined in a web between the handle and the box end and communicated with the hole of the box end;
- a ratchet gear including an inner periphery adapted to drive a fastener and an outer periphery, the outer periphery of the ratchet gear including a plurality of first teeth, the ratchet gear being rotatably mounted in the hole of the box end;
- a pawl mounted in the slant hole and including a first end with a plurality of second teeth for releasably engaging with the first teeth of the ratchet gear, the pawl further including a second end;
- a plug securely mounted in the slant hole; and
- an elastic member mounted in the slant hole and having a first end attached to the second end of the pawl and a second end attached to the plug for biasing the second teeth of the pawl to engage with the first teeth of the ratchet gear;
- the first end of the pawl further including a beveled face that faces the inner periphery of the slant hole and the pawl bears against the inner periphery of the slant hole at a point, whereby when the ratchet-type spanner is turned, the beveled face of the pawl is capable of pivoting about the point and thus moving toward the inner periphery of the slant hole, thereby assuring reliable engagement between the first teeth of the ratchet gear and the second teeth of the pawl.
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- In accordance with a fourth aspect of the invention, a ratchet-type spanner comprises:
- a handle;
- a box end extended from the handle and having a hole, an inner periphery defining the hole of the box end including a first annular groove, a slant hole being defined in a web between the handle and the box end and communicated with the hole of the box end;
- a ratchet gear including an inner periphery adapted to drive a fastener and an outer periphery, the outer periphery of the ratchet gear including a plurality of first teeth, the ratchet gear being rotatably mounted in the hole of the box end, the outer periphery of the ratchet gear further including a second annular groove facing the first annular groove;
- a C-clip received in the first annular groove and the second annular groove for rotatably retaining the ratchet gear in the hole of the box end;
- a pawl mounted in the slant hole and including a first end with a plurality of second teeth for releasably engaging with the first teeth of the ratchet gear, the pawl further including a second end;
- a plug securely mounted in the slant hole; and
- an elastic member mounted in the slant hole and having a first end attached to the second end of the pawl and a second end attached to the plug for biasing the second teeth of the pawl to engage with the first teeth of the ratchet gear;
- the first end of the pawl further including a beveled face that faces the inner periphery of the slant hole and the pawl bears against the inner periphery of the slant hole at a point, whereby when the ratchet-type spanner is turned, the beveled face of the pawl is capable of pivoting about the point and thus moving toward the inner periphery of the slant hole, thereby assuring reliable engagement between the first teeth of the ratchet gear and the second teeth of the pawl.
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- Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
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- Fig. 1 is a perspective view of a perspective view of an end portion of a ratchet-type spanner in accordance with the present invention.
- Fig. 2 is an exploded perspective view of the end portion of the ratchet-type spanner in accordance with the present invention.
- Fig. 3 is a top view, partly sectioned, of the end portion of the ratchet-type spanner in accordance with the present invention.
- Fig. 4 is a view similar to Fig. 3, wherein a hole in a web in the spanner extends along a different axis.
- Fig. 5 is a view similar to Fig. 3, wherein the pawl has no beveled face.
- Fig. 6 is a sectional view taken along line 6-6 in Fig. 3.
- Fig. 7 is an exploded perspective view of a ratchet-type spanner.
- Fig. 8 is a top view of an end portion of the ratchet-type spanner in Fig. 7.
- Fig. 9 is an enlarged view of a portion of the end portion in Fig. 8.
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- Referring to Figs. 1 through 5 and initially to Figs. 1 and 2, a ratchet-
type spanner 10 in accordance with the present invention generally includes ahandle 12 and abox end 11 having ahole 111. An inner periphery (not labeled) defining thehole 111 of thebox end 11 includes anannular groove 112 in a lower portion thereof. Theannular groove 12 is formed simultaneously when thebox end 11 is formed by a cutting tool. Thus, the manufacture cost for the spanner is reduced, as the annular ledge 8' and cover 6' required in the prior art ratchet-type spanner is omitted. Aweb 13 is defined between thebox end 11 and thehandle 12 and has aninclined indication area 14 for indicating ratcheting direction of the spanner by the inclination direction of theinclined indication area 14. Aslant hole 15 is defined in theweb 13 and includes an inner end communicated with thehole 111 of thebox end 11 and an outer end communicated with outside. Theslant hole 15 extends along an axis that is at an angle (preferably 18.5°) with a normal to a longitudinal axis of the box end, as shown in Fig. 3. - A
ratchet gear 20 is mounted in thebox end 11 and includes aninner periphery 21 for driving a fastener (not shown) and anouter periphery 22. Theouter periphery 22 includes anupper end portion 23, alower end portion 24, and a middle portion with a plurality of recessedratchet teeth 25. Thelower end portion 24 includes anannular groove 241. A C-clip 26 is received in theannular groove 241 of thelower end portion 24 and theannular groove 112 of thebox end 11, thereby rotatably retaining theratchet gear 20 in thebox end 11 of thespanner 10, best shown in Fig. 6. - A substantially
cylindrical pawl 30 is mounted in theslant hole 15 in theweb 13 and includes ratchetteeth 31 on an end thereof for engaging withratchet teeth 25 of theratchet gear 20. The end of theratchet 31 further includes abeveled face 32, which will be described later. Anelastic member 40 is also mounted in theslant hole 15 in theweb 13 and includes an end attached to the other end of thepawl 30. The other end of theelastic member 40 is attached to aplug 50 that is securely mounted in the outer end of thehole 15 in theweb 13. In this embodiment, the other side of thepawl 30 has a recess 33 (Fig. 3) for receiving the end of theelastic member 40 and theplug 50 includes areceptacle 52 in an inner side thereof for receiving the other end of theelastic member 40. Theplug 50 includes at least oneknurl 51 formed on an outer periphery thereof for retaining theplug 50 in place by force-fitting engagement with an inner periphery of theslant hole 15 in theweb 13. Tolerance problem in the diameter of theslant hole 15 and the outer diameter of theplug 50 is eliminated by the force-fitting engagement between theknurl 51 and the inner periphery of thehole 15. - Referring to Fig. 3, when not in use, the
pawl 30 bears against theslant hole 15 at point A, and thebeveled face 32 of thepawl 30 and the inner periphery of theslant hole 15 has a gap therebetween. Theratchet teeth 31 on thepawl 30 completely mesh with theconcave ratchet teeth 25 of theratchet gear 20. It is noted that the complete engagement between theteeth slant hole 15 extends along an axis that is at an angle of 18.5° with the normal to the longitudinal axis of thebox end 11. - Turning to Fig. 4, in some cases the
slant hole 15 does not extend along an axis that is at an angle of 18.5° with the normal to the longitudinal axis of thebox end 11 due to tolerance in the processing precision. For example, when theslant hole 15 extends along an axis that is at an angle of 20.5° with the normal to the longitudinal axis of thebox end 11, thebeveled face 32 of thepawl 30 and the inner periphery of thehole 15 has a gap therebetween. When thespanner 10 is turned, theratchet teeth 31 on thepawl 30 are subjected to a force F via transmission of theratchet teeth 25 of theratchet gear 20. Thepawl 30 pivots about point A such that thebeveled face 32 of thepawl 10 is in intimate contact with the inner periphery of thehole 15, thereby still providing complete engagement between theteeth - Fig. 5 illustrates a comparative example, wherein the
pawl 30 has nobeveled face 32 while theslant hole 15 extends along an axis that is at an angle of 20.5° with the normal to the longitudinal axis of thebox end 11. It is apparent that theratchet teeth 31 on thepawl 30 cannot engage with theratchet teeth 25 of theratchet gear 20 without provision of thebeveled face 32 when thespanner 10 is turned. Thus, provision of thebeveled face 32 on thepawl 30 may obviate manufacture tolerance of drilling theslant hole 15 in theweb 13. - According to the above description, it is appreciated that the ratchet-type spanner in accordance with the present invention includes several advantages. Firstly, the
inclined indication area 14 indicates the ratcheting direction of the spanner. Manufacture of thebox end 11 is easier and inexpensive by means of directly forming theannular grooves protrusion 51 of theplug 50 may reliably retain theplug 50 in place and thus retain thepawl 30 and theelastic member 40 in place, and the tolerance problem is also obviated. Furthermore, thebeveled face 32 of thepawl 30 may obviate manufacture tolerance of drilling theslant hole 15 in theweb 13. - Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (20)
- A ratchet-type spanner, comprising:a handle;a box end extended from the handle and having a hole, a slant hole being defined in a web between the handle and the box end and communicated with the hole of the box end;a ratchet gear including an inner periphery adapted to drive a fastener and an outer periphery, the outer periphery of the ratchet gear including a plurality of first teeth, the ratchet gear being rotatably mounted in the hole of the box end;a pawl mounted in the slant hole and including a first end with a plurality of second teeth for releasably engaging with the first teeth of the ratchet gear, the pawl further including a second end;a plug securely mounted in the slant hole by force-fitting engagement with an inner periphery defining the slant hole; andan elastic member mounted in the slant hole and having a first end attached to the second end of the pawl and a second end attached to the plug for biasing the second teeth of the pawl to engage with the first teeth of the ratchet gear.
- The ratchet-type spanner as claimed in claim 1, wherein the first end of the pawl includes a beveled face that faces the inner periphery of the slant hole.
- The ratchet-type spanner as claimed in claim 1, wherein the web includes an inclined indication area for indicating ratcheting direction of the ratchet-type spanner by an inclination direction of the inclined indication area.
- The ratchet-type spanner as claimed in claim 1, wherein the plug includes at least one knurl formed on an outer periphery thereof, said at least one knurl being in force-fitting engagement with the inner periphery defining the slant hole.
- The ratchet-type spanner as claimed in claim 1, wherein an inner periphery defining the hole of the box end includes a first annular groove, the outer periphery of the ratchet gear including a second annular groove facing the first annular groove, further comprising a C-clip received in the first annular groove and the second annular groove for rotatably retaining the ratchet gear in the hole of the box end.
- A ratchet-type spanner, comprising:a handle;a box end extended from the handle and having a hole, a slant hole being defined in a web between the handle and the box end and communicated with the hole of the box end, the web including an inclined indication area for indicating ratcheting direction of the ratchet-type spanner by an inclination direction of the inclined indication area;a ratchet gear including an inner periphery adapted to drive a fastener and an outer periphery, the outer periphery of the ratchet gear including a plurality of first teeth, the ratchet gear being rotatably mounted in the hole of the box end;a pawl mounted in the slant hole and including a first end with a plurality of second teeth for releasably engaging with the first teeth of the ratchet gear, the pawl further including a second end;a plug securely mounted in the slant hole; andan elastic member mounted in the slant hole and having a first end attached to the second end of the pawl and a second end attached to the plug for biasing the second teeth of the pawl to engage with the first teeth of the ratchet gear.
- The ratchet-type spanner as claimed in claim 6, wherein the first end of the pawl includes a beveled face that faces the inner periphery of the slant hole.
- The ratchet-type spanner as claimed in claim 6, wherein the plug includes at least one knurl formed on an outer periphery thereof, said at least one knurl being in force-fitting engagement with an inner periphery defining the slant hole.
- The ratchet-type spanner as claimed in claim 6, wherein an inner periphery defining the hole of the box end includes a first annular groove, the outer periphery of the ratchet gear including a second annular groove facing the first annular groove, further comprising a C-clip received in the first annular groove and the second annular groove for rotatably retaining the ratchet gear in the hole of the box end.
- A ratchet-type spanner, comprising:a handle;a box end extended from the handle and having a hole, a slant hole being defined in a web between the handle and the box end and communicated with the hole of the box end;a ratchet gear including an inner periphery adapted to drive a fastener and an outer periphery, the outer periphery of the ratchet gear including a plurality of first teeth, the ratchet gear being rotatably mounted in the hole of the box end;a pawl mounted in the slant hole and including a first end with a plurality of second teeth for releasably engaging with the first teeth of the ratchet gear, the pawl further including a second end;a plug securely mounted in the slant hole; andan elastic member mounted in the slant hole and having a first end attached to the second end of the pawl and a second end attached to the plug for biasing the second teeth of the pawl to engage with the first teeth of the ratchet gear;the first end of the pawl further including a beveled face that faces the inner periphery of the slant hole and the pawl bears against the inner periphery of the slant hole at a point, whereby when the ratchet-type spanner is turned, the beveled face of the pawl is capable of pivoting about the point and thus moving toward the inner periphery of the slant hole, thereby assuring reliable engagement between the first teeth of the ratchet gear and the second teeth of the pawl.
- The ratchet-type spanner as claimed in claim 10, wherein the web includes an inclined indication area for indicating ratcheting direction of the ratchet-type spanner by an inclination direction of the inclined indication area.
- The ratchet-type spanner as claimed in claim 10, wherein the first teeth of the ratchet gear are concave.
- The ratchet-type spanner as claimed in claim 11, wherein the plug includes at least one knurl formed on an outer periphery thereof, said at least one knurl being in force-fitting engagement with an inner periphery defining the slant hole.
- The ratchet-type spanner as claimed in claim 11, wherein an inner periphery defining the hole of the box end includes a first annular groove, the outer periphery of the ratchet gear including a second annular groove facing the first annular groove, further comprising a C-clip received in the first annular groove and the second annular groove for rotatably retaining the ratchet gear in the hole of the box end.
- A ratchet-type spanner, comprising:a handle;a box end extended from the handle and having a hole, an inner periphery defining the hole of the box end including a first annular groove, a slant hole being defined in a web between the handle and the box end and communicated with the hole of the box end;a ratchet gear including an inner periphery adapted to drive a fastener and an outer periphery, the outer periphery of the ratchet gear including a plurality of first teeth, the ratchet gear being rotatably mounted in the hole of the box end, the outer periphery of the ratchet gear further including a second annular groove facing the first annular groove;a C-clip received in the first annular groove and the second annular groove for rotatably retaining the ratchet gear in the hole of the box end;a pawl mounted in the slant hole and including a first end with a plurality of second teeth for releasably engaging with the first teeth of the ratchet gear, the pawl further including a second end;a plug securely mounted in the slant hole; andan elastic member mounted in the slant hole and having a first end attached to the second end of the pawl and a second end attached to the plug for biasing the second teeth of the pawl to engage with the first teeth of the ratchet gear;the first end of the pawl further including a beveled face that faces the inner periphery of the slant hole and the pawl bears against the inner periphery of the slant hole at a point, whereby when the ratchet-type spanner is turned, the beveled face of the pawl is capable of pivoting about the point and thus moving toward the inner periphery of the slant hole, thereby assuring reliable engagement between the first teeth of the ratchet gear and the second teeth of the pawl.
- The ratchet-type spanner as claimed in claim 15, wherein the first end of the pawl includes a beveled face that faces the inner periphery of the slant hole.
- The ratchet-type spanner as claimed in claim 15, wherein the plug includes at least one knurl formed on an outer periphery thereof, said at least one knurl being in force-fitting engagement with an inner periphery defining the slant hole.
- The ratchet-type spanner as claimed in claim 15, wherein the web includes an inclined indication area for indicating ratcheting direction of the ratchet-type spanner by an inclination direction of the inclined indication area.
- The ratchet-type spanner as claimed in claim 15, wherein the first teeth of the ratchet gear are concave.
- A pawl comprising an end with a plurality of teeth adapted to engage with a ratchet gear of a ratchet-type spanner, the end of the pawl comprising a beveled side.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US523624 | 1990-05-15 | ||
US09/523,624 US6263767B1 (en) | 2000-01-19 | 2000-03-13 | Pawl for a ratchet-type spanner |
Publications (2)
Publication Number | Publication Date |
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EP1136186A2 true EP1136186A2 (en) | 2001-09-26 |
EP1136186A3 EP1136186A3 (en) | 2003-06-04 |
Family
ID=24085745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00122394A Withdrawn EP1136186A3 (en) | 2000-03-13 | 2000-10-26 | Pawl for a ratchet-type spanner |
Country Status (1)
Country | Link |
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EP (1) | EP1136186A3 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10238803B4 (en) * | 2001-08-27 | 2004-09-09 | Bobby Hu | Method of making a ratchet wrench |
WO2012063122A3 (en) * | 2010-04-30 | 2014-07-17 | Wolf-Dietrich Zander | Arrangement or tool for transmitting a torque |
CN104949075A (en) * | 2015-07-06 | 2015-09-30 | 江苏无畏警用装备制造有限公司 | Police shoulder lamp clamp and manufacturing method thereof |
DE102017111158A1 (en) | 2017-05-22 | 2018-11-22 | Gedore-Werkzeugfabrik Gmbh & Co. Kg | Wrench |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2201827A (en) * | 1939-04-17 | 1940-05-21 | Otto P Froeschl | Ratchet mechanism |
US4991468A (en) * | 1990-08-10 | 1991-02-12 | Lee Clark J | Barrel type sockets |
DE29901793U1 (en) * | 1999-02-02 | 1999-04-01 | Hsieh Chih Ching | Ratchet socket wrench |
-
2000
- 2000-10-26 EP EP00122394A patent/EP1136186A3/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2201827A (en) * | 1939-04-17 | 1940-05-21 | Otto P Froeschl | Ratchet mechanism |
US4991468A (en) * | 1990-08-10 | 1991-02-12 | Lee Clark J | Barrel type sockets |
DE29901793U1 (en) * | 1999-02-02 | 1999-04-01 | Hsieh Chih Ching | Ratchet socket wrench |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10238803B4 (en) * | 2001-08-27 | 2004-09-09 | Bobby Hu | Method of making a ratchet wrench |
WO2012063122A3 (en) * | 2010-04-30 | 2014-07-17 | Wolf-Dietrich Zander | Arrangement or tool for transmitting a torque |
CN104949075A (en) * | 2015-07-06 | 2015-09-30 | 江苏无畏警用装备制造有限公司 | Police shoulder lamp clamp and manufacturing method thereof |
CN104949075B (en) * | 2015-07-06 | 2017-10-27 | 无畏警用装备有限公司 | Police shoulder lamp folder and preparation method thereof |
DE102017111158A1 (en) | 2017-05-22 | 2018-11-22 | Gedore-Werkzeugfabrik Gmbh & Co. Kg | Wrench |
Also Published As
Publication number | Publication date |
---|---|
EP1136186A3 (en) | 2003-06-04 |
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