Handling: hand and hoist-line implements – Hand forks and shovels – Convertible and combined
Patent
1988-01-25
1988-11-22
Marbert, James B.
Handling: hand and hoist-line implements
Hand forks and shovels
Convertible and combined
7114, 5640004, 172375, B25F 102
Patent
active
047860952
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
In one form of construction which is already known, a gardening hand tool is provided with a handle or a set of handles and it is possible to use each handle with a series of different implements which are interchangeable. The handles of a set can have different lengths or widths.
2. Description of the Prior Art
In accordance with one design of the prior art, the tool proper or implement is provided with a socket of hexagonal cross-section and the socket is intended to be inserted in a coupling sleeve attached to the handle. An internally-threaded bore is pierced in the socket wall and a captive clamping screw engaged within said bore has the function of detachably fixing the handle on the tool. This mode of attachment, however, is not sufficiently reliable since the screw is liable to work loose more and more readily as the threads become worn during service. In accordance with another known practice, an end-piece which is integral with the tool proper and of rectangular cross-section is engaged in a coupling sleeve which is attached to the handle, said sleeve being provided with a recess having a corresponding cross-section. The end-piece is retained within said recess by means of a pushbutton locking device which is adapted to cooperate with an orifice pierced in the terminal face of the end-piece. All these devices are not only complex and costly to manufacture but also make it necessary to replace the handle when they no longer operate correctly.
SUMMARY OF THE INVENTION
It is a general object of the invention to provide a novel mode of construction which ensures rapid and convenient attachment in a reliable manner while further achieving low cost in comparison with known tools having detachable handles.
Accordingly, another object of the invention is to provide a gardening hand tool consisting of a handle and a number of different tools proper which can be interchangeably mounted on said handle.
A further object of the invention is to provide each tool proper with a hollow mounting end-piece fitted externally with a hook-shaped or channel-shaped member, the opening of which is directed towards the working end of the tool proper.
Yet another object of the invention is to provide a handle having dimensions at the lower end which are such as to permit engagement with slight friction within said end-piece.
Still another object of the invention is to provide a device which has the function of retaining the tool proper on the handle and which is fixed on said handle in proximity to the lower end thereof. The device under consideration is provided with an element in the form of a resilient loop and this latter is intended to be engaged within said hook-shaped or channel-shaped member which is fitted on said end-piece. Said device is also provided with means for stretching or slackening said resilient loop after the engagement aforesaid has taken place in order to ensure a rigid assembly between the handle and the tool proper or to permit separation of these latter.
The element in the form of a resilient loop can be a coil spring of sufficiently high strength or a metallic cable which is preferably sheathed.
In accordance with a particular form of construction, the means for stretching or slackening said resilient loop include a base which is intended to be fixed on the handle near the lower end of this latter, a lever pivotally mounted on the base as well as a yoke pivotally mounted on said lever by one of its ends and on the opposite end of which is mounted said loop. The lever is intended to be swung-down towards the lower end of the handle after this latter has been introduced within the end-piece in such a manner as to ensure that said base is located opposite to the aforesaid hook-shaped or channel-shaped member in order to permit engagement of said resilient loop in said member, said lever being subsequently intended to be swung-back towards the upper end of the handle until it is applied against said base in order to stretch and lock the resil
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patent: 1525524 (1925-02-01), Wagenaar
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patent: 4162132 (1979-07-01), Kress et al.
patent: 4232422 (1980-11-01), Fellmann
patent: 4606089 (1986-08-01), King
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