MXPA98008356A - Small handle tool for automati picaportes - Google Patents

Abstract

The present invention relates to a small handle tool for an automatic latch, comprising: a tool handle defining a rectangular cross-sectional shape and having a maximum width of less than about 9 mm, and includes a tool recess defined at one end of the handle through two tool support surfaces oriented at an acute angle relative to each other, to receive and support a tool insert, wherein one of the tool support surfaces is oriented approximately parallel to an adjacent side of the handle forming a elongated body portion between the tool recess and the respective side of the handle and having a thickness of at least about 1.0 mm, a tool insert approximately with a rhomboid shape defined by an inscribed circle having a diameter of less than about 90 % of the handle width, and defining a clamping opening extending to Through the approximate center of the circle having a diameter smaller than approximately 70% of the diameter of the inscribed circle, the tool insert in the shape of a rhomboid is received within the tool recess with two sides of the insert each engaging a respective tool support surface of the handle and a substantial portion of the other two sides of the insert extending beyond the end of the handle and forming a cutting nozzle to cut a workpiece, and a threaded fastener extending through the clamping opening and threadedly attached to the handle of the handle. tool for rigidly attaching the tool insert to the tool handle, the threaded fastener defines a head having a maximum diameter of less than about 70% of the diameter of the inscribed circle.

Description

SMALL HANDLE TOOL OR FOR AUTOMATIC PICAPORTES FIELD OF THE INVENTION The present invention relates to cutting tools for automatic latches, and more particularly to such cutting tools having an interchangeable tool insert attached to a handle with the insert defining a generally rhomboid shape and having a cutting surface extending beyond the Handle nozzle for cutting a workpiece, and particularly suitable for use with small-handle cutting tools that have handles with a width less than 9mm.

BACKGROUND OF THE INVENTION In a typical Swiss-type automatic screw machine, a plurality of cutting tools are radially disposed about a sliding head for cutting a workpiece, which is rotationally and longitudinally driven relative to the tools. Cutting tools are typically composed of a blade or insert attached to a tool holder or handle, and the handles are selectively driven to move the tools radially in and out of engagement with a workpiece to cut the workpiece as desired . Tool handles are typically made of rectangular bars that are slidably mounted within corresponding channels formed in a tool tower or gauge plate mounted around or above the head. The tool handles are provided with the following industry-standard widths: 7 mm, 8 mm, 10 mm, 12 mm. Too small automatic screw machines can only fit handles with a 7 and 8 mm width (hereinafter referred to as "small handle" cutting tools), while larger automatic screw machines use the handles that have widths of 10 mm or greater. Cutting tools that have a handle width of 8 mm or larger are commercially available in different configurations. In one type, the carbide blades are brazed to the ends of the handles. In another type, inserts of interchangeable carbide tools are screwed or clamped to the ends of the handles. One advantage of brazing cutting tools is that they are relatively less expensive to manufacture and the blades are strongly secured in place. An advantage of interchangeable tool inserts, on the one hand, is that the inserts are provided with more than one cutting edge so that when each edge wears, crumbles or otherwise requires replacement, the tool insert can be relatively and quickly rotated or indexed on the handle by adjusting the clamp or clamp to place a new cutter edge of the insert in a cutting position. The clamping mechanisms can provide a secure closure; however, they are relatively bulky and can not always be easily assembled into screw machines, particularly machines that require small handle tools, and therefore, may require additional fixing time and installation costs. Currently, most cutting tool manufacturers provide the same series of tool inserts for use with each of the handles available to each manufacturer. In addition, most manufacturers only provide interchangeable tool inserts for tools that have handles with widths of 10 mm or larger. For cutting tools that have handle widths less than 10 mm, these manufacturers recommend the use of tools welded with brazing, as described above. A disadvantage of brazed tools however, is that once the blades wear out, they must be ground to reform the cutting edges, or the entire tool must be replaced, and the machine must be reset to accept the tool. The inventor of this application is not aware of any manufacturer who has provided cutting tools with interchangeable inserts for handle widths of less than 8 mm, and is only aware of a manufacturer who has provided cutting tools with interchangeable inserts for handles with widths of 8 mm. mm. Referring to Figure 1, a commercially available cutting tool is generally indicated with the reference number 1. The cutting tool 1 includes a rectangular shaped handle 2 having a width of 8 mm, and a rhomboid-shaped insert (or diamond-shaped) 3 attached to one end of the handle through a screw 4. As can be seen, the tool insert 3 is defined by an inscribed circuit, which is approximately equal to the width of the handle 2 (8 mm ), and the handle defines an individual tool support edge 5 for engaging and supporting a corresponding edge of the tool insert. One of the problems encountered with this configuration is that if the insert presents a torque in the clockwise direction in Figure 1, the tool insert can be relatively and easily dislodged from the handle, thereby causing the Cutting tool is not effective and requires a time consuming interruption and fixation to either repair or replace the tool. As illustrated in the dotted lines in Figure 1, the industry has attempted to overcome this problem by providing the handle with another smaller support edge 5 'on the opposite side of the tool insert relative to the first support edge 5. However , due to the size and location of the second support edge, this provides additional small support and has proved relatively easy to break, and otherwise has failed to effectively prevent the insert from being dislodged when the torque is at the clockwise direction in Figure 1. Accordingly, the prior art has failed to provide an acceptable small-handle cutting tool with interchangeable tool inserts, in the form of a rhomboid, and it is an object of the present invention to provide such a cutting tool that overcomes the disadvantages of the previously described technique.

COMPENDIUM OF THE INVENTION The present invention is directed to a cutting tool having a small handle for an automatic latch, comprising a tool handle defining a rectangular transverse shape having a maximum width of less than about 9 mm, and preferably either 7 mm or more. 8 mm, and includes a tool recess defined at one end of the handle through two tool support surfaces oriented at an acute angle relative to each other. One of the tool support surfaces is generally parallel to an adjacent side of the handle, and the handle defines an elongate body portion extending between the respective tool support surface and the side of the handle having a thickness of at least about 1.0 mm to improve the structural integrity of the respective tool support surface. A rhomboid-shaped tool insert of cutting tool is seated within the tool recess of the handle with two sides of the insert each engaging a respective tool support surface, and a substantial portion of the other of the two sides of the insert extending further. beyond the end of the handle and forming a cutting nozzle to cut a work piece. The rhomboid-shaped insert defines an inscribed circle having a diameter less than about 90% of the maximum width of the handle, and a clamping opening extending through the approximate center of the inscribed circle defining a diameter of less than about 70% of the diameter of the inscribed circle. A threaded fastener of the cutting tool extends through the clamping opening and is threadably attached to the tool handle to securely attach the tool insert to the tool handle. The threaded fastener defines a recessed head having a maximum diameter of less than about 70% of the diameter of the inscribed circle, in order to maintain sufficient structural integrity of the insert to avoid failure during machining operations. An advantage of the present invention is that an interchangeable rhomboid-shaped insert can be used with handles with a width of either 7 mm or 8 mm and the handle engages and supports such inserts along a substantial portion of the two sides of the insert to firmly secure the insert and prevent the insert from being dislodged or defective in a manner similar to that found with the prior art small handle cutting tools described above. Other objects and advantages of the present invention will be apparent in view of the following detailed description and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a plan view of a cutting tool having a handle with a width of 8 mm and an interchangeable tool insert. Figure 2 is a side plan view of a handle or tool holder of a cutting tool modeling the present invention. Figure 3 is a top plan view of the handle of Figure 2. Figure 4 is a side plan view of an interchangeable tool insert modeling the present invention for joining the handle of Figures 2 and 3. Figure 5 is an elevation view of a threaded fastener modeling the present invention to attach the interchangeable insert of Figure 4 to the handle of Figures 2 and 3.

Figure 6 is a top plan view of the threaded fastener of Figure 5. Figure 7 is an elevational, partially schematic view of several different configurations of the cutting tool of the present invention, illustrating several illustrative types of machining operations that they can be made with the different configurations.

DETAILED DESCRIPTION OF THE PREFERRED MODALITY In Figures 2 and 3, a typical tool holder or handle modeling the present invention is generally indicated with the reference number 10. The handle 10 is adapted to hold one or more interchangeable tool inserts., typically shown at 12 in Figure 4, for use in a screw machine automatically, and is particularly suitable for use in "small-handle" screw machines that only accommodate handles having widths less than 9 mm. Currently, the industry standard handle widths for such "small handle" machines are 7 mm and 8 mm. As shown in Figure 2, the handle 10 defines an elongated body 14 or extending longitudinally, having a rectangular transverse configuration. In the embodiment of the present invention illustrated, each of the four sides of the body 14 defines an equal width "A" forming a square cross section. One end of the body 14 of the handle defines a tool recess 16 for receiving and supporting a tool insert 12 (Figure 4) as described below. The recess 16 is defined by a first tool support surface 18, a second tool support surface 20 and a base surface 22 extending between the first and second surfaces and oriented normal to this surface. As shown in Figure 2, the first and second tool support surfaces 18 and 20 are oriented at an acute angle "B" relative to each other, and the outermost end of each tool support surface is oriented tangentially to an inscribed circle "IC" defined by each tool insert 12 (Figure 4). As can be seen in Figure 2, the first and second tool support surfaces 18 and 20 are positioned on the body 14 in order to define an elongate lip or support body section 24 behind the second support surface of tool 20 and having a thickness "C". In order to provide adequate support for the tool insert when it is received in the recess 16 and otherwise ensure the structural integrity of the cutting tool, the thickness C of lip 24 is preferably at least about 1.0. mm for a handle that has a width a of about 7 mm, and may be thicker for handles of greater width. Also as shown in Figure 2, the handle 10 defines a relief cavity 26 formed in the innermost ends of the first and second tool support surfaces 1 8 and 20. Returning to Figure 4, the interchangeable tool insert 12 has four sides forming a substantially diamond or diamond configuration, including two first parallel sides 28 and two parallel second seconds 30. Each first side 28 of the insert is oriented at an acute angle B relative to a respective second side 30, and the adjacent pairs of the first and second sides, each forming a respective cutting nozzle 32, having a depth "D", as shown in Figure 4. Each cutting nozzle 32 defines one or more respective cutting edges, which are formed and configured according to the particular type of machining operation that will be performed, as described below. For example, as shown in Figure 4, a chamfer is formed at the junction of each respective pair of the first and second surfaces 28 and 30, respectively. The tool insert 12 is preferably made of carbide steel, but can also be made of other desired materials. The angle B of the tool insert shown in Figure 4 is equal to the angle B of the handle shown in Figure 2, so that when the insert is received within the recess 16 of the handle, the first and second respective surfaces 28 and 30 they are seated in conformation coupling with the first and segmented their tool support surfaces 1 8 and 20 of the handle, respectively, to securely support the insert on both sides. In the embodiment of the present invention illustrated, the angle B is approximately 35 °; however, as will be recognized by those skilled in the art, this angle may change as desired depending on the requirements of a particular cutting tool design or other machining system. When the tool insert 12 is received within the depression 16 of the handle, preferably substantially all of the depth D of the respective cutting nozzle 32 extends beyond the end surface 33 of the handle (Figures 2 and 3), as shown in FIG. describe later. As shown in the dashed lines in Figure 4, the insert 12 defines an inscribed circle "IC", which is defined by the diametrical distance between either the first opposite sides 28 or the second opposite sides 30 of the insert. In the embodiment of the present invention illustrated, the tool insert 12 is designed for tool handles having a width A of 7 mm or greater, and therefore, the diameter of the inscribed circle IC is approximately 6 mm. Accordingly, in a handle 10 having a width of 7 mm, the thickness C of the support lip 24 is approximately 1 mm, and in handles with a greater width, the thickness C may be greater. In accordance with the present invention, for such handles of small width (i.e., 8 mm or less), the diameter of the inscribed circle IC should be no more than about 90% of the width A of the handle, and for 7 mm handles , the diameter of the inscribed circle IC is preferably about 86% or less than the width of the handle, in order to ensure that the lip 24 has sufficient thickness and structural integrity to firmly support the tool insert during machining operations. Accordingly, the diameter of the inscribed circle IC is preferably within the range of about 5.5mm to 6.5mm for handles having a width within the range of about 7mm to 8mm. Also as shown in Figure 4, the tool insert 12 defines a recessed opening 34 extending through the approximate center of the inscribed circle IC to receive a threaded fastener 36 (Figure 5) to securely attach the insert to the handle. The recessed opening 34 defines a maximum diameter E, which is sufficiently smaller than the diameter of the inscribed circle IC of the insert to maintain its structural integrity. As shown in Figure 5, the threaded fastener 36 is preferably a stuffed torsion screw that defines a maximum head diameter E, which is approximately equal to the maximum diameter E of the recessed opening 34 of the tool insert. In this embodiment of the invention, wherein the tool insert defines an inscribed circle IC having a diameter of about 6 mm, the diameter E should be no more than about 4 mm, and preferably is about 3.5 mm. However, as will be recognized by those skilled in the art, the diameter D may be changed as required depending on the inscribed circle of the insert. In accordance with the present invention, for tool inserts having an inscribed circle IC of about 6 mm or less, the diameter E must be no greater than about 70% of the diameter of the inscribed circle. Similarly, for the insert of the invention, wherein the diameter of the inscribed circle IC is within the range of about 5 mm to 6.5 mm for handle widths within the range of about 7 mm to 8 mm, the maximum head diameter E will be within the range of approximately 3 mm to 4.5 mm, depending on the specific minimum handle width and the selected inscribed circle. Also referring to Figure 5, in this embodiment of the invention, the angle F of the conical shaped surface 38 of the clamping head is approximately 60 ° (the "embossed angle"); however, as will be recognized by those skilled in the art, this angle can be changed within limits depending on the requirements of a particular cutting tool design or other machining system. In accordance with the present invention, the angle F is preferably within the range of about 52 ° to 68 ° to minimize the total head diameter. Also as will be recognized by those skilled in the art, the surface angle of the embossed aperture 34 is selected to substantially coincide with the angle F of the fastener 36 and is preferably configured such that when the fastener is received within the aperture and threadedly coupled with the handle, the upper part of the fastener is approximately at the same level as the upper edge of the opening. As shown in Figures 2 and 3, the handle 10 defines a threaded hole 40 for threadably receiving the fastener 36 after attachment of the tool insert 12 to the handle. The threads of the fastener and hole are preferably relatively thin, in the preferred embodiment illustrated, an "M2.5-4H" thread (2.5 mm pitch x 4 threads per mm) is employed. Accordingly, the tool insert 12 is seated within the recess 16 of the handle with a first respective side 28 of the insert engaging the first tool support surface 18, and the second adjacent side 30 of the insert engaging the second tool support surface 20 of the handle. The fastener 36 is then inserted through the recessed opening 34 of the insert and threadedly engaged within the threaded hole 40 of the handle to securely secure the insert to the handle. As mentioned above, the cutting nozzle 32 of each insert 12 can have any of the different shapes and / or configurations, depending on the type of machining operation that will be performed. For example, as typically shown in Figure 7, the cutting nozzle 30 of the insert 12 can be ground or otherwise configured in the different configurations shown for performing front turn, rear turn, cut, threading, tilt and turn operations. , and grooved. On the upper side of the workpiece in Figure 7, the three illustrative cutting tools of the present invention are shown in a bottom plan view, while on the underside of the workpiece, the three cutting tools are shown in a top floor view. An advantage of the cutting tool of the present invention is that since the diameter of the inscribed circle IC is preferably less than about 6 mm, for small width handles, having a width of 8 mm or less, there is sufficient space for one side of the tool insert when attached to the handle to provide a second tool and lip support surface for coupling and supporting the rhomboid insert on both sides. Accordingly, problems associated with prior art small handle cutting tools with interchangeable inserts are substantially avoided. As will be recognized by those skilled in the art, numerous changes and modifications may be made to the above-described and other embodiments of the present invention, without departing from its scope, as defined in the appended claims. Accordingly, this detailed description of a preferred embodiment should be taken as illustrative, as opposed to a limiting sense.

Claims (9)

1 . A small handle tool for an automatic latch, comprising: a tool handle defining a rectangular transverse shape and having a maximum width of less than about 9 mm, and including a tool recess defined at one end of the handle through two surfaces of tool holders oriented at an acute angle relative to each other, to receive and support a tool insert, wherein one of the tool support surfaces is oriented approximately parallel to an adjacent side of the handle forming a body portion elongated between the tool recess and the respective side of the handle and having a thickness of at least about 1.0 mm; a tool insert approximately with a rhomboid shape defined by an inscribed circle having a diameter less than about 90% of the handle width, and defining a grip opening extending through the approximate center of the inscribed circle having a smaller diameter than about 70% of the diameter of the inscribed circle, the rhomboid-shaped tool insert is received within the tool recess with two sides of the insert each engaging a respective tool holder surface of the handle and a substantial portion of the other two sides of the insert extending beyond the end of the handle and forming a cutting nozzle to cut a workpiece; and a threaded fastener extending through the fastening aperture and threadedly into the tool handle to securely attach the tool insert to the tool handle, the threaded fastener defines a head having a maximum diameter of less than about 70% of the diameter of the inscribed circle.

2. A small-handled tool according to claim 1, wherein the first and second tool-supporting surfaces are oriented at an angle of about 35 ° relative to each other.

3. A small-handled tool according to claim 1, wherein the tool handle defines a square transverse shape having a width of either 7 mm or 8 mm.

4. A small-handled tool according to claim 1, wherein the inscribed circle has a diameter within the range of about 5.5 mm to 6.5 mm, and the maximum handle width is within the scale of about 7. mm to 8 mm.

5. A small-handled tool according to claim 1, wherein the maximum handle width is within the range of about 7 mm to 8 mm and the maximum head diameter of the threaded fastener is within the scale of approximately 3 mma 4.5 mm.

6. A small hand tool according to claim 5, wherein the threaded fastener is an embedded screw defining an embossed angle within the range of about 52 ° to 68 °.

7. A small-handled tool according to claim 6, wherein the embossed angle of the threaded fastener is 60 °.

8. A small handle tool for an automatic latch, comprising: an axially elongated tool handle defining a rectangular transverse shape and having a maximum width within the range of about 7 mm to 8 mm, and defining at least two surfaces of substantially straight tool holders oriented at an acute angle relative to each other, to support a tool insert, wherein one of the tool support surfaces is generally parallel to an adjacent side of the tool handle defining a portion of axially elongate body, extending between the respective tool support surface and the side of the tool handle having a thickness of at least about 1.0 mm to support a tool insert by engaging the respective tool support surface; a tool insert with a generally rhomboid shape defined by an inscribed circle having a diameter within the range of about 5.5 mm to 6.5 mm, and defining a grip opening located within an inscribed circle and extending through the insert, where the clamping opening has a maximum diameter within the range of about 3 mm to 4.5 mm, and the rhomboid-shaped insert is mounted on the tool handle with two sides of the rhomboid insert each engaging a tool support surface respective of the tool handle and a substantial portion of the other two sides of the rhomboid insert extending beyond the respective end of the tool handle and defining at least one cutting edge for cutting a workpiece; and a recessed fastener extending through the clamping opening and threadedly attached to the tool handle to securely attach the tool insert to the tool handle, the threaded clamp defines a recessed head having a maximum diameter within the range of about 3 mm to 4.5 mm.

9. A small-handled tool according to claim 8, wherein the first and second tool-supporting surfaces are oriented at an angle of about 35 ° relative to one another. 1 0. A small-handled tool according to claim 8, wherein the threaded fastener defines an embossed angle within the range of about 52 ° to 68 °. eleven . A small-handled tool according to claim 10, wherein the embossed angle is 60 °. 12. A tool insert for a small handle tool for an automatic latch, wherein the small handle tool includes a tool handle having a maximum width of less than about 9 mm, and a tool recess defined at one end of the handle through two tool support surfaces oriented at an acute angle relative to each other to receive or support the tool insert, wherein one of the tool support surfaces is oriented approximately parallel to an adjacent side of the tool. the handle forming an elongate body portion between the tool recess and the respective side of the handle, and defining a thickness of at least about 1.0 mm, and the small handle tool further includes a threaded fastener to securely attach the tool insert to the tool. tool handle; The tool insert comprises: frame sides defining an approximately rhomboid shape, said insert defining an inscribed circle having a diameter less than about 90% of the handle width, and a clamping aperture extending through the approximate center of the circle inscribed having a diameter less than about 70% of the diameter of the inscribed circle, the rhomboid-shaped insert can be received within the tool recess of the tool handle with two sides of the insert each engaging a respective tool holder surface of the handle and a substantial portion of the other two sides of the insert extending beyond the end of the handle and forming a cutting nozzle to cut a workpiece. A tool insert according to claim 12 wherein the two sides of the insert engaging the tool support surfaces are oriented at an angle of about 35 ° relative to each other. A tool insert according to claim 12, wherein the two sides of the insert extending beyond the end of the handle are oriented at an angle of approximately 35 ° relative to each other. 15. A tool insert according to the claim 12, wherein the inscribed circle has a diameter within the range of about 5.5 mm to 6.5 mm.