Extension element for use with wrench-type hand tools

• US 5,033,337 A
• Filed: 11/20/1990
• Issued: 07/23/1991
• Est. Priority Date: 11/20/1990
• Status: Expired due to Fees

• Current Assignee: David W. Thomas III
• Original Assignee: David W. Thomas III
• Inventors: Thomas, David W. III
• Primary Examiner(s): MEISLIN, DEBRA S
• Application Number:
  US07/615,919
• Time in Patent Office: 245 Days
• Field of Search: 81/177.2, 81/177.1, 81/177.85, 403/108, 403/109, 403/324-326, 403/377-379, 403/330
• US Class Current: 81/177.2
• CPC Class Codes: B25B 23/0021 Prolongations interposed between handle and tool

Abstract

An extension unit is used in conjunction with wrench-type hand tools, such as socket and ratchet wrenches. One form of the unit includes a handle and an extension arm that has a plurality of spring-loaded balls thereon at distances that are spaced apart from each other along the longitudinal axis of the extension arm by increments that are uniform. A further extension element is attached to the handle and a bayonet coupling is used to properly align the further extension element with respect to the handle. A second form of the unit includes a spring loaded catch and spring loaded anchors.

Claims

1. An extension unit for use with wrench-type hand tools comprising:

(A) a tubular hollow handle element having

(1) a first end,

(2) a second end,

(3) a cylindrical body connecting said first and second ends together, said cylindrical body including a longitudinal axis extending from said first end to said second end, and

(4) a bore defined through said body from said first end to said second end, said bore being rectangular in cross section and including planar sides, adjacent ones of which intersect each other to form corners;

(B) a monolithic extension arm element slidably attached to said handle element and including

(1) a first end,

(2) a second end,

(3) a ratchet accommodating element on said extension arm first end,

(4) means for accommodating a socket element on said extension arm second end,

(5) said extension arm including a longitudinal axis extending from said extension arm first end to said extension arm second end and having a rectangular cross section with planar sides adjacent ones of which intersect each other to form corners, said extension arm corners being received in said handle bore corners;

(C) connecting means for coupling said extension arm element to said handle element and including

(1) a plurality of blind-ended bores defined in said extension arm at locations which are uniformly spaced apart along said extension arm longitudinal axis,

(2) a spring element located in each blind-ended bore and being connected at one end thereof to said extension arm element,

(3) a ball element in each blind-ended bore and being connected to the spring element in said blind-ended bore, said spring element biasing said ball element outwardly of said blind-ended bore,

(4) a release pin bore defined through said handle element adjacent to said handle element first end to intersect said handle element bore,

(5) a release pin slidably mounted in said release pin bore with a lower end located in said release pin bore and an upper end which is located outside of said release pin bore, said release pin being slidable in said release pin bore from a first location with said release pin lower end spaced from said handle element bore to a second position with said release pin lower end being flush with said handle element adjacent to said handle element bore, and

(6) a tether element connecting said release pin to said handle element.

2. The extension unit defined in claim 1 wherein said ratchet accommodating element is rectangular in shape.

3. The extension unit defined in claim 2 further including a further extension unit which includes

(1) an annular bore defined in said handle element to extend along said handle element longitudinal axis from said second end, said annular bore being circular and having a radius which is larger than a dimension of one of said rectangular bore sides so that said annular bore encircles said handle element rectangular bore,

(2) a screw thread on said handle element adjacent to said annular bore so that said annular bore is internally threaded,

(3) a second extension element which includes

(a) a first end,

(b) a second end,

(c) a cylindrical body connecting said second extension element first and second ends, said cylindrical body having a longitudinal axis extending from said second extension element first end to said second extension element second end,

(d) a rectangular bore defined along said second extension element longitudinal axis, said second extension element rectangular bore being sized to match the size and shape of said handle element rectangular bore,

(e) a tubular extension element on said second extension element first end and extending along said second extension element longitudinal axis from said second extension element first end, said tubular extension including an outer surface and having a radius which is equal to the radius of said handle element annular bore so that said tubular extension element can be received in said handle element annular bore,

(f) a screw thread defined in said tubular extension element outer surface, said tubular extension element screw thread being designed to cooperate with the screw thread in said handle element annular bore to threadably couple said further extension unit to said handle element.

4. The extension unit defined in claim 3 further including a position setting means which includes

(a) a cavity defining housing mounted on said handle element adjacent to said handle element second end and having a rear end which is located in a plane containing said handle element second end,

(b) a cavity defined in said position setting means cavity defining housing to be concave with respect to the plane containing said handle element second end,

(c) a ball housing element mounted on said further extension element near said further extension unit first end, said ball housing element including

(1) a rear end spaced from said further extension unit first end,

(2) a cylindrical body extending from said rear end to said further extension unit first end to be located in a plane containing said further extension unit first end,

(3) a bore defined in said ball housing to extend from said rear end,

(4) a spring element connected at one end thereof to said rear end and being located in said ball housing element bore,

(5) a ball located in said ball housing element bore adjacent to said further extension unit first end, said ball being connected to said further extension unit spring element to be biased outwardly of said ball housing bore,

(6) said ball element housing being mounted on said further extension unit and said cavity defining housing being mounted on said handle element in positions so that said further extension means ball element is received into said cavity when said further extension means first end is in abutting contact with said handle second end and said further extension means rectangular bore has the corners thereof aligned with the corner of said handle element rectangular bore.

5. An extension unit for use with wrench-type hand tools comprising:

(A) an outer sleeve having a first end, a second end, a cylindrical hollow wall connecting said first end to said second end, and a central longitudinal axis extending from said first end to said second end;

(B) a shaft received in said outer sleeve, said shaft including a first end, a second end, a hollow cylindrical wall connecting said shaft first end to said shaft second end, a longitudinal centerline which is coincident with said outer sleeve longitudinal centerline when said shaft is received in said outer sleeve, a hollow bore defined through said shaft from said shaft first end to said shaft second end, said hollow bore being rectangular in transverse cross sectional shape, and a plurality of depressions located on said shaft at positions which are spaced apart from each other along said shaft longitudinal centerline, each depression extending completely around said shaft;

(C) an insert element having a first end, a second end, and a rectangular body connecting said insert element first end to said insert element second end, said insert element being sized to slidably fit into said shaft rectangular bore;

(D) locking means for locking said insert element to said shaft and including

(1) two depressions defined in said shaft adjacent to said shaft bore, said depressions being diametrically opposite to each other,

(2) two triangular elements mounted on said insert element, each triangular element having a first apex spaced from the outside surface of said insert element, and a second apex,

(3) a pivot pin pivotally connecting each triangular element second to said insert element,

(4) a receiving chamber defined in said insert element adjacent to each triangular element and positioned with respect to said each triangular element such that sad each triangular element can move into and out of said receiving chamber, and

(5) two spring elements, each located adjacent to one of said triangular elements and having one end mounted on said insert element in the receiving chamber associated with said triangular element and another end connected to said triangular element to bias said triangular element outwardly of said receiving chamber; and

(E) attaching means for attaching said outer sleeve to said shaft and including

(1) a pivot mount on said outer sleeve,

(2) a handle pivotally mounted on said pivot mount, said handle including an engaging end and an operating end,

(3) a slot defined through said outer sleeve in position to receive at least one portion of said handle,

(4) said handle being positioned so that said handle engaging end moves through said attaching means slot into and out of said outer sleeve, said handle being sized so that said engaging end engages said shaft adjacent to one of said depressions to lock said shaft to said outer sleeve in a manner which prevents said shaft from moving longitudinally of said outer sleeve, and

(5) a spring having one end thereof fixed to said outer sleeve and another end thereof fixed to said handle and biasing said handle into a shaft engaging position.