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[ EN ]

Descripti on
Tit l e

Technical Field
The invention is to an axially movable tool, used for cutting, and a guide for the tool. These tools are used by craftsmen and others for cutting or forming holes in wood, metals, plastics, etc. It is desirable that these holes be perpendicular to the surface, or at a specific angle to it, and formed with a specific degree of safety and accuracy.

Background Art
Portable hand tools are in common use. These tools are relatively inexpensive to purchase and convenient to use. The two major problems encountered are the safety of the worker and accuracy of the work performed. To overcome these problems many solutions have been proposed. One of the most common proposals is attachments such as guides and supports for use with the tools. Most of these devices require that one or both hands be on the tool with no separate provision made for stabilization of the attachment. When a separate provision is made, it is usually necessary to balance the force applied to the tool.

It is common to have the line of force that is applied to the tool, and/or guide, project outside and beyond the guide base. This creates a clumsy hold and a torque that tends to move the guide and prevent an accurate location and maintenance of the guide on the work, and tends to preclude an accurate and constant angle for tool advancement. Examples are the patents to A. J. Daniels, U.S. Patent No. 2,831,376 issued 22 April 1958 and
E. W. Purkey, U.S. PatentNo. 3,250,153 issued 10 May 1966. To balance this force or torque, handles have been added; A. C. Carles, U.S. Patent No. 2,953,045, issued
20 September 1960 and R.O. Hudson, U.S. Patent No 4,080,092, issued 21 March 1978. Even when one of the forces on the tool or a handle is in line with the area encompassed by the base, the other is placed in opposition to that force or creates a torque with respect to it;
J. P. Pufahl, U.S. Patent No. 3,100,408, issued
13 August 1963 and L. E. Pugsley, U.S. Patent No. 3,107,556, issued 2 October 1963.
When guideways are associated with tools they are often circular and either permit rotation of the tool about the guide or require two posts; L. J. Leitner et al , U.S. Patent No. 2,837,939, issued 10 June 1958 and I. J. Epstein, U.S. Patent No 4,279,552, issued
21 July 1981. Those that are not circular are placed on the side of the tool or opposite the tool grip, reducing visibility and the ability of the tool to access areas such as corners; M. Van Praag, U.S. Patent No. 3,242,773, issued 29 March 1966 and G. C. Lipe, U.S. Patent No 3,746,460, issued 17 July 1973. Non-circular posts, adjustable stops on posts, and graduations on posts, per se, are old in the art; A. T. Abell, U.S. Patent No. 3,853,420, issued 10 December 1974, N. A. Lopez, U.S. No. 2,050,709, issued 11 August 1936, and A. Boyajian, U.S. Patent No. 3,838,935, issued 1 October 1974.

Disclosure of Invention
The present invention is an improvement over the tool guides and supports of the prior art. The tool is provided with a guideway that is on the same side as the gripping means, so that visibility in the cutting zone, and the ability to access corners, is unimpaired. By the use of any shape non-circular guideway, rotation of the tool on the guide is precluded, assuring linear movement using only one post. The guide means is provided with a base that supports a post in essentially the shape of the guideway of the tool, and a handle for location, placement and retention of the guide on the work before and during use of the tool. The handle is located and positioned on the base so that pressure applied to the base through it projects within the footprint defined by the area encompassed by the base. The post is located on the base so that the gripping means of the tool, when attached, moves with respect to the base in a line that falls within the footprint of the base. While not necessary in the preferred embodiment, the post is perpendicular to the base with the upper extent free of obstructions. Even the novice can quickly and accurately position the tool on the guide and make perpendicular cuts. By this arrangement, the handle permits one hand of the operator to locate the base on the work and press the base to the work while the other hand is free to advance the tool .
Both the force on the handle and any portion of the force on the gripping means that reaches the base add to press the base onto the work. For greater retention of the base on the work, the base can be provided with apertures used with attachment means such as screws or sharpened pins or friction feet. Any type surface from soft to hard, flat material can be accurately worked on. Slots or other openings can be provided on one end or two sides of the base to receive slidable means for adjusting the angle at which the base rests on the work and thus the angle that the tool penetrates the surface worked on. Graduations can be placed on the post so that the depth of penetration can be observed. Adjustable slide stops can be placed on the post to mechanically limit penetration and give depth control .
By use of the invention, the safety and accuracy of a conventional bench-mounted tool is more nearly achieved while using inexpensive portable hand tools. The invention accomplishes the increased safety and accuracy with a simplified, relatively inexpensive, structure that can be made of commonly used materials. Since one hand is used to grip the tool and one the guide in a stable manner, the possibility of accident or injury is reduced. The non-circular configuration of the single post and guideway assures linear advancement of the tool. The material forming the slot, usually being weaker than that of the post, has its shape and dimensions protected due to its internal positioning." Accordingly, it is the object of the present invention to provide:
a device that is compact and immediately, easily, and safely usable upon purchase without modification, assembly, or disassembly by a worker having minimal skills;
a device with a guide means that enables even an unskilled worker to drill perpendicular holes into a surface or, with adjustment, at select angles to the surface;
a simple guide that easily permits a tool to be engaged to a guide post for controlled angular use and to be removed therefrom for independent use;
a tool with an internal guideway in such a position that it does not interfere with visibility in the cutting zone;
a tool that can be independently used in hard-to-reach areas, such as corners, as a conventional power tool unencumbered with attachments;
a post on a base, located so that the force applied to the tool guided by the post projects within the area encompassed by the base footprint;
a handle on a base that supports a tool guide with means for controlling the depth of penetration;
a means to adjust the angle between the base and work surface; and
a tool guide that can be used on a horizontal , vertical, angled or overhead surface.

Brief Description of the Drawings
Figure 1 is a perspective view of the tool , shown as a drill, with an internal guideway.
Figure 2 is a perspective view of the preferred embodiment of the guide means.
Figure 3 is a side elevational view of the tool positioned on the guide means .
Figures 4, 5 and 6 are sectional views of supplemental securing means.

Figure 7 is a fragmentary view of the post with graduations and stop means.
Figures 8 and 9 are fragmentary views of base angle adjustment means .

Best Mode for Carrying Out the Invention
In accordance with the present invention, a tool, such as a drill shown in Fig. 1, is provided with an internal guideway (8) with a through opening or slot (2) on the same side as the tool gripping means (3) between the gripping means and tool axis (7). Such positioning leaves the front (6) and sides (5) of the tool and, for example, the cutting means holder or chuck assembly of a drill (4) accessible for use of a drill key and permits unobstructed visibility in the cutting zone during use. The guideway slot (2) is parallel to the tool axis so that the line of force (15) applied to the tool grip advances the tool toward and intothe work along the axis (7) at the angle determined by the positioning of the guide post.
As shown in Fig. 2, the guide means (10) consists of a base (13,17), a post (11), and a handle (12). The base with cross members (13) and spaced supports (17), can take any convenient configuration, such as spaced supports in the form of an H or an A with parallel legs or a U, etc., so long as the footprint or area encompassed is large enough to enclose the projection of the lines of force (15,16) applied to the handle and tool grip. The base shown has the spaced supports (17) with an open area thereinbetween positioned by base cross members (13). This configuration is preferred because it can be used on narrow work such as 2x4's. The handle (12) can be positioned at any point within the footprint; it can project inwardly from any area on the periphery of the base or can be attached to the post (11). The lower end of the post (11) can be positioned at any point within the footprint of the base. In the preferred embodiment of Fig. 2 the handle (12) is secured to the lower end of the post (11) with at least the central and upper extent of the post being of uniform cross-section and free of obstruction. To have both the post and handle positioned reasonably close to the center of the footprint, the post is offset from the center of the base footprint. As can be seen best in Fig. 2, the central and upper extent of the post (11) are of uniform cross-section, match that of the slot (2), and and are free from obstructions permitting the tool to be quickly and easily placed onto and removed from the post.
Fig. 3 shows the tool (1) positioned on the post (11). It can be seen that both the force (15) applied to the grip and force (16) applied to the handle, project within the footprint of the base (13,17).
If a more secure attachment of the base to the work is desired, added means may be provided. Such means are shown in Figs. 4-6, as screws (20), sharpened pins (21), and friction feet (22) positioned in apertures (14) provided in the base cross members (13) or supports (17).
As shown in Fig. 1 , the post is provided with graduated markings (25), so that the depth of penetration of the tool into the work can be calculated, and an adjustable stop (26), to mechanically limit penetration or cut depth.
As shown in Figs. 8 and 9, the base can be provided with grooves or slots (40,47) that enable elevation and adjustment (44,48) of one end of the base on the work. This allows control of the angle of the post with respect to the work surface, and thus the angle of tool penetration, if other than a perpendicular cut is desired. Threaded securing means (42,46) are provided to secure the desired angular position. The securing means (46) is threaded into the support (17), and clamps the bar (45) to the support (17). The securing means (42) is threaded into the slide (41) and presses against support (17) to secure the slide (41) to the support (17). Graduated scales (25) are provided to assist proper location of the slide (41) and adjust bar (45).

It is believed that the construction, operation and advantages of this device will be apparent to those skilled in the art. It is to be understood that the present disclosure is illustrative only and that changes, variations, substitutions, modifications and equivalents will be readily apparent to one skilled in the art and that such may be made without departing from the spirit of the invention as defined by the following claims.