Patent Application
20090313780
The present invention relates to handles used primarily with scraping tools in the construction trade. More particularly, the invention relates to an adjustable swiveling handle for a hand-held manual scraper.
In certain construction trades involved with the installation of floor covering materials, such as carpet and tile, hand-held manual scraping tools are often used to remove adhered residue from floors as part of a final preparatory step. Heavier scraping tools, especially machine-driven scrapers, are often used to prepare large areas by removing old floor coverings and associated residue. However, it is often necessary to remove lesser amounts of residue, especially from relatively small areas such as in corners and under overhangs, which heavier scraping tools are unable to clear effectively. In addition, removal of residue from less rugged surfaces, such as interior walls, sometimes requires a more controllable, lighter and smaller tool.
To meet demand for lighter, more controllable scraping tools, various hand-held scrapers have been developed. One type of scraping tool, sometimes called a “T-handled scraper”, utilizes a thin, razor-like blade in a scraping position at the end of a shaft, which is typically about eighteen inches long. The scraping blade itself typically has a cutting edge about three to five inches long. At the other end of the shaft, an oblong handle is fixed to the shaft. The handle is configured to be grasped in the palm of one hand, with the shaft of the scraper passing between the fingers of the hand. With this type of scraper, a user can clean surfaces using a single hand, leaving the other hand free.
Considerable hand pressure may sometimes be required when using such a tool, which may cause hand or arm fatigue when the tool is used repeatedly. In addition, heavy use of a hand-held scraping tool may cause blisters on a user's hand, because of relative movement between the hand and the handle of the scraper. To overcome these concerns, prior art scrapers have included a handle that swivels freely around the shaft during use. A handle with such freedom of movement has been found to relieve strain on a user's arm and wrist, as well as reducing relative movement between the user's palm and the handle.
However, a handle with such freedom of movement may in some instances prove a detriment rather than a benefit. In some cases a user may find that a fixed handle may provide better leverage and greater ease of use in certain instances. In addition, there may be times where a fixed handle having an angle of rotation about the shaft different from that of the scraping blade may provide for greater ease of use.
Accordingly, there is a need for a new type of adjustable, swiveling handle that may at times freely rotate about the shaft of the tool and at other times be adjustable to a plurality of fixed rotational positions. This new type of handle would be less fatiguing to use and less likely to cause blisters during heavy use. The present invention satisfies these needs and provides other related advantages.
The present invention is directed to a hand tool, preferably a scraper, comprising a tool head, a tool shaft, and a handle. The tool shaft has a first end which is attached to the tool head and a faceted second end to which the handle is attached.
The handle is selectively and adjustably attached to the second end of the tool shaft by a bore. The bore comprises a cylindrical first section for receiving the second end of the tool shaft in a manner permitting free rotation of the handle relative to the tool shaft. The bore also comprises a coaxial, faceted second section for alternatively receiving the second end of the tool shaft in a manner preventing free rotation of the handle relative to the tool shaft. A lock releasably secures the handle to the second end of the tool shaft.
The cylindrical first section of the bore defines a first interior shoulder and the faceted second section defines a second interior shoulder in the bore. The second end of the tool shaft defines an exterior shoulder. When the cylindrical first section of the bore receives the second end of the tool shaft, the first interior shoulder engages the exterior shoulder of the second end of the tool shaft. When the faceted second section receives the second end of the tool shaft, the second interior shoulder engages the exterior shoulder.
The handle may be made from plastic, reinforced plastic, die-cast metal or machined metal. Types of plastic may include nylon or ABS (acrylonitrile butadiene styrene) wherein the handle is metal may be made from aluminum coated with a rubberized plastic.
When the cylindrical first section receives the second end of the tool shaft, the handle freely rotates about the tool shaft in a plane perpendicular to the tool shaft. When the faceted second section receives the multiple facets of the second end of the tool shaft, the handle is adjustably rotatable to multiple locking positions about the shaft in a plane perpendicular to the shaft. The lock includes threads mated to threads in an opening in the shaft or lugs mated to recesses in the opening in the shaft.
Other features and advantages of the present invention will become apparent from the following more detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention.
The accompanying drawings illustrate the invention. In such drawings:
As shown in the exemplary drawings, for purposes of illustration, the present invention is directed to a hand tool, generally referred to by reference numeral 20, with a novel swiveling/adjustable handle. The present invention was specifically designed with the hand tool 20 being a hand-held scraper but may find application in other types of hand tools.
As shown in
The shaft 24 extends from a bushing 30 that is preferably integral with the tool head 22. The shaft 24 is typically between about six inches and thirty inches long. In a particularly preferred embodiment, the shaft 24 is about eighteen inches long. The shaft 24 is preferably made from a piece of metal, such as steel or aluminum, either solid or hollow tubing with a smooth exterior wall.
As shown more clearly in
As illustrated in
The bore 32 includes a cylindrical section 40 at one end thereof and a coaxial, faceted section 42 at the other end. The handle 26 may be attached to the stem 34 through either end of the bore 32. In this way, either the cylindrical section 40 or the faceted section 42 will surround the stem 34 and engage the faceted portion 36 thereof. If the cylindrical section 40 is the portion of the bore 32 that engages the faceted portion 36, then the handle 26 will freely rotate about the stem 34 as shown by arrow A in
The faceted section 42 of the bore 32 includes three or more inwardly oriented faces 44. The number of faces 44 in the faceted section 42 preferably equals the number of faces 38 on the faceted portion 36 or is some multiple thereof, such that matching faces 38, 44 can engage and lock the handle 26 at a particular rotational angle with respect to the stem 34 as shown by arrows B in
To switch between a freely rotating configuration or a locked rotation configuration, the handle 26 may be completely removed from the stem 34 and rotated 180° so as to switch between the cylindrical section 40 or the faceted section 42 engaging the stem 34 of the shaft 24. The interior of the bore 32 may include a narrower central section 46 such that a first interior shoulder 48 is adjacent to the cylindrical section 40 and a second interior shoulder 50 is adjacent to the faceted section 42. Similarly, the stem 34 may have a relatively narrower section 52 such that an exterior shoulder 54 is defined adjacent to the faceted portion 36. When the handle 26 is attached to the stem 34, either the first or second interior shoulders 48, 50 would engage the exterior shoulder 54. The surfaces of these shoulders 48, 50, 54 are all formed or machined smooth so as to create an essentially frictionless surface.
A lock or locking pin 56 is removably attached to the stem 34 so as to secure the handle 26 when attached. The lock 56 may be secured to an opening 58 in the end of the stem 34 and may be secured by mating threads 60, lugs 62 and recesses within the opening 58, or other commonly known methods of securing. When the locking pin 56 is secured in the opening 58, the pin 56 will secure the handle 26 against the stem 34.
Although several embodiments have been described in detail for purposes of illustration, various modifications may be made without departing from the scope and spirit of the invention. Accordingly, the invention is not to be limited, except as by the appended claims.
