Metal working – Means to assemble or disassemble – Spring applier or remover
Reexamination Certificate
2000-03-29
2001-06-05
Watson, Robert C. (Department: 3723)
Metal working
Means to assemble or disassemble
Spring applier or remover
C081S007500
Reexamination Certificate
active
06240611
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a device for rewinding and replacing strip type springs of concentric coils in equipment such as chain saws, weed cutting implements, etc. and in particular relates to a device for rewinding starter springs used in pull-cord starting mechanisms of internal combustion engines.
Heretofore, when it was necessary to replace a strip type spring used in conjunction with pull-cord starting mechanisms of internal combustion engines, it was generally done by hand requiring a person to wind the spring in a tight coil and then place the spring within the housing of the equipment. This was a tedious, difficult and time consuming operation. Attempts have been made to produce tools for accomplishing this purpose and several patents have been granted showing and describing such tools. Some of the previous tools require the operator to wind the spring, remove the wound spring by hand and place the spring in the housing using one's hands or plyers. The handling of the spring often resulted in the spring becoming unwound, thus having to repeat the procedure again from the beginning.
SUMMARY OF THE INVENTION
It is a principal object of the present invention to provide a tool for readily winding a strip type spring and placing the spring in the housing of a gas operated engine.
Another object of the invention is to provide an improved spring coiling device which is easy to operate and is of a simple construction.
Still another important object of the present invention is to provide a spring coiling device that enables unskilled people to readily rewind a spring and place it in equipment such as chain saws, weed cutting implements, etc.
Still another important object of the present invention is to provide a starter spring rewinder which can be safely used for rewinding a starter spring and inserting the starter spring in the housing of equipment in a safe and easy manner.
The tool constructed in accordance with the present invention for coiling a spring and holding the coiled spring for insertion in a housing of an implement includes a cylindrical spring cap having a downwardly extending flange. A window is provided in the downwardly extending flange through which an end of a flat spring to be coiled is inserted. An inner housing extends into the cylindrical spring cap and has an ejector plate supported on a remote end thereof. A vertically extending bore is provided in a lower end of the inner housing for permitting a spring holder to extend vertically therein.
A hole is provided in the ejector plate through which the spring holder extends into the spring cap. The spring holder is carried on a lower end of the spring loaded plunger for holding an end of a spring to be coiled when in a first extended position and for releasing the end of the spring to be coiled when retracted to a second position.
A handle is carried by an upper end of the spring loaded plunger for rotating the plunger and the spring holder for drawing the spring to be coiled through the window in the cap and coiling the spring within the cap. The handle is also used for raising the plunger to release the coiled spring from the spring holder.
The spring coiling cap is supported on a lower end of a movable housing so that upon raising the movable housing, the ejector plate can be moved from an upper position within the coiling cap to a position outside of the coiling cap. A finger grip is carried on the surface of the movable housing for raising the movable housing and cap relative to the ejector plate for ejecting the coiled spring from the cap when placing the spring in the housing of the implement.
The spring holder member is a tubular member having a slotted opening provided in a side wall thereof. When a spring is to be coiled, an enlarged portion adjacent the end of the spring is inserted within the tubular member and extends through the slotted opening provided in the side wall for preventing the enlarged end of the spring from being pulled through the holder during the coiling operation of the spring.
The tool also has a control cap carried on top of the plunger which has a first slot provided in the upper surface thereof of a first depth. A second slot is transversely disposed in the upper surface of the control cap from the first slot and is of a different depth. The depth of the first and second slots provided in the upper surface of the control cap are dimensioned to receive the handle carried by the spring loaded plunger so that when the handle is positioned in one slot it holds the spring holder member in the spring cap and when the handle is in the second slot the spring holder member is pulled upward into the base of the inner housing to release the spring being coiled.
The spring cap is threadably secured to a lower end of the movable housing so that the spring cap can be removed from the movable housing and another spring cap of a different size can be placed on the movable housing for coiling springs of a different size. The ejector plate is also threadably secured on the end of the inner housing so that it can be changed and an ejector plate of a different size can be placed on the end of the inner housing.
The invention will be further understood by reference to the following detailed description of an embodiment of the invention taken in conjunction with the drawings, in which:
REFERENCES:
patent: 973045 (1910-10-01), Hobb et al.
patent: 2563112 (1951-08-01), Hill et al.
patent: 2717527 (1955-09-01), Rapp
patent: 3263532 (1966-08-01), Amberg
patent: 3748716 (1973-07-01), Fidler
patent: 3894743 (1975-07-01), Hiroumi
patent: 4183268 (1980-01-01), Anderson
patent: 4807347 (1989-02-01), Johnson
patent: 5113561 (1992-05-01), Scott
Dority & Manning P.A.
Watson Robert C.
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