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Publication numberUS921840 A
Publication typeGrant
Publication dateMay 18, 1909
Filing dateOct 25, 1907
Priority dateOct 25, 1907
Publication numberUS 921840 A, US 921840A, US-A-921840, US921840 A, US921840A
InventorsFrank M Jacobs
Original AssigneeFrank M Jacobs
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Detachable extension-handle for tools.
US 921840 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)


Patented May 18, 1909.


vwentoz F. M. JACOBS.

Patented May 18, 1909.


@1400 n to:


re ns a- JACOBS, or. warn-assume PENNSYLVANIA. a nnrnccstinnn nit'rnnsron-nazmm non 'roons.

' and useful Detachable Extension-Handle for Tools, of which the following is a specification. v

This invention relates to detachable 'extension handles for screw drivers, girnlets,

. awls, and similar tools and has for its object to provide a comparatively simple and inexpensive device of this character for attachment to difierent kinds of tool bits so that the same may be conveniently manipulated without the necessity of employing individual handles for said tool bits.

- A further object of the invention is to provide an extension handle comprising a plurality of detachable sections having interengagin parts and capable of being readily unit to lengthen or shorten a tool and which may be quickly disconnected so as to permit theseveral sections to be compactly assembled in a small compass for transportation-or shipment.

A further object is to provide means for locking the tool bits in engagement with the tubular sections, and means for locking one handle in engagement with an adjacent handle thereby to produce a double hand grip.

A still further object of the invention is to generally improve this class of devices so as to increase their utility, durability and elliciency as well as to reduce the cost of manufacture.

Further objects and advantages will appear in the following description, it being understood that various changes in form, proportions and minor details of construction'may be resorted to within the scope of the ap ended claims.

In tlie accompanying drawings forming a part of this specificationi Figure 1 is a side elevation of a tool handle constructed in accordance with my invention showing the several sections comprising the handle detachably united to form a relatively long shank. Fig. 2 is a perspective view showing the several sections comprising the handle disconnected. Fig. 3 is a side elevation showing two of the sections united to form a double hand grip. Fig. 4is a similar view showing a tool bit in position on one of the handles. Fig; 5 is a transverse sectional view taken on the line 55 of Fig. 1. 6 is Specification of Letters Patent. Application filed. October 26, 1907. Serial Np. 899,164.

Patented May 18, 1909.

i an enlarged, detail perspective view of one end of one of the tubular members. Fi 7 is a perspective view of a detachab e wrench socket foruse in connection with the extension handle. Fig. 8 is a side elevation of a bit stock showing a detachable bit in position, thereon.

Similar numerals of reference indicate corresponding parts in all of the figures of the drawings.

Theimproved device forming the subject matter of the present invention comprises a said sections being tubular in cross section and formed of metal or other suitable ma terial.

One end of the section 5 is provided with a reduced ortion 8 and is adapted to engage the interior walls of the adjacent section 6, said reduced ortion being provided with a transverse loc ing pin 9 which engages correspondingly sha (1 slots 10 formed in the ad acent end of t c section 6 when said sections are united.

The metal forming the terminal portion of the extension 8 is cut or slit longitudinally at 11 to form a luralityofspringfingers 12 adapted to ielda ly engage the interior-walls of the memlier 6 and thus assist in preventing accidental displaccment of the sections.

The metal on each side of the slots 10 is also slitlongitudinally at 13 to produce spring fingers 14 the terminalsof which are curved or rounded and deflected inwardly so as to exert a spring clamping action on'the adjacent section. Secured to the sections 5 and 6 in any suitable manner as by transverse pins 15 are hand grips 16 each provided with a longitudinal bore 17 for the reception of the adjacent tubular section, as shown.

The upper or enlarged and of each handle with the adjacent end of-the tubular member or section so that when a single hand grip is employed a smooth exterior surface will be presented to the hand of the operator.

The section 7 is used in connection with either or both of the hand grips 16 in order to lengthen the tool so that the latter may be employed for ositioning screws or performing other wor where an ordinary screw driver would prove inadequate.

One end of the section 7 is provided with a transverse locking pin 18 similar in construction to the locking pin 9 of the section 5 while the opposite end thereof is pnovided plurality of detachable sections 5, 6 and 7,

16 is curved or rounded and terminates flush on the section 5.

The slots 10 of the several tubular members or sections are designed to receive the locking pins 9 or similar ins 19 formed on a removable tool bit 20. a means for looking the tool bit 20 in engagement with the .free end of the section 7 the latter is provided with a tubular member or sleeve 21 which is slidably mounted on the exterior walls of the section 7 and is provided with oppositely disposed transverse slots 22 adapted to register with an opening or perforation 23 formed in said .section for the reception of a locking pin 24. The locking pin 24 extends transversely through the aperture 23- and is provided with an enlarged head 25 adapted to be seated in the adjacent transverse slot 22, said head being formed with a shoulder.

26 for engagement with the adjacent wall of the slot 22 thereby to prevent rotation of the locking member or sleeve 21. The lower end of the sleeve or looking member 21. is formed with oppositely disposed bayonet slots 27 adapted to accommodate the pins 19 on the bit 20 thereby to assist in preventing withdrawal of the bit from the section 7. It will thus be seen that by moving the head 25. of the locking pin laterally until the shoulder 26 clears the adjacent wall of the locking member 21 said member may be rotated until the mouth of each bayonet slot registers with the adjacent end of the pin 19 when the bit 20 may be withdrawn from the tubular member 7.

In order to lock the bit in position on the section 7 it is merely necessary to rotate the tubular member 21 in the opposite direction and force the pin 25 laterally until the shoulder 26 engages the adjacent wall of the slot 22 when the tubular member will be locked against rotation with the walls of the bayonet slot extended in the path of movement of the pins 19 so as to effectually prevent accidental dis lacement of said bit.

ombined with the tubular sections 5, 6 and 7 is an auxiliary section or handle 28 having aT shaped hand grip 29 and provided with a locking pin 30 adapted to engage the slots 10 of any one of the detachable sections.

hand grip so as to facilitate manipulatinglocking member and said aperture.

the tool.

When an additional grip is desired, however, the auxiliary handle 28 is insertedin the adjacent end of the tubular member 5, as best shown in Fig. 1 of the drawings.

If it is desired to shorten the tool the auxiliary handle 28 and tubular member 7 are disconnected by exerting a longitudinal pull on the same and the bit 20 inserted in the lower end of the section 6 with the locking pins'19 engaging the walls of the adjacent slots 10, as best shown in Fig. 3 of the draw- In some classes of work it is desirable to employ a tool havin a single operating handle or hand grip an a device of this character is illustrated in Fig. 4 of the drawings in which the bit 20 is supported in the end of the tubular member or section 6.

In Fig. 8 of the drawings there is illustrated a bit stock 30 the shank of which may be provided with a hand gri or inserted .in

, an ordinary brace in the usua manner.

A suitable form of tool-may be used in con nection with the bit stock 30 such as an auger, drill bit and the-like, the bit 20 being shown by way of illustration in connection with the stock or shank 30 and locked in position thereon by a tubular member or sleeve similar in construction to the sleeve shownin Fig. 1 of the drawing.

A detachable wrench socket 31 is shown in Fig. 7 of the drawings for attachment to any one of the tubular sections comprising the extensible handle.

It will thus be seen that by connecting or disconnecting the several sections comprising the handle the latter may be lengthened or shortened at will so that the same may be used for different purposes.

It will also be noted that b forming the handle of a pluralit of detachable sections said sections ma be readily disconnected and compactly fo ded in a small compass for transportation or storage.

The several sections are interchangeable and'reversible and may be readily assembled or disconnected by an unskilled person.

From the foregoing description it will be seen that there is provided an extremely simple, inexpensive and eflicient; device admirably adapted for the attainment of the ends in view.

Having thus described the invention what extension detachably secured to one of the hand grips and provided with a transverse aperture, means carried by the extension for engagement with a tool bit, a locking member mountedfor rotation on the tubular ex tension and adapted to engage the tool bit,

and a locking pin extending through the j 2. A tool "ncluding a plurality of tubular sections provided with interengaging parts,

a tubular extension secured to one of said sections and gilovided with oppositely disposed slots de ingspring fingers, a tool bit aving a laterally extending pin ada ted to engage said slots, a locking member s idably mounted on the tubular extension and provided with bayonet slots adapted to receive the pins on the tool bit, and a locking key tubular extension.

3. A tool including terminal sections each having one end thereof provided with a laterally extending locking pin and its opposite end formed with spaced longitudinal slots, there being spring fingers disposed between the slots, and an intermediate section having its opposite ends formed with longitudinal slots adapted to receive the locking pins of the adjacent terminal sections. W

4. A tool including terminal sections each having one end thereof provided with a laterally extending pin and spaced spring fingers, the opposite ends of said sections being ormed with longitudinal slots, an intermediate section havin its opposite ends provided with opposite y disposed slots adapted to receive the pins of the, terminal sectlons, and hand ips carried by the intermediate section an one of the terminal sections.

5. A tool including terminal sections each transverse pin and its ogpositeend formed with longitudinal slots efining spring fingers', an intermediate section having oppositely disposed slots for engagementwith the transverse pins, there being an aperture extendlng'transversely through one of the terextending through the locking member and minal sections, a bit having laterally extending locking ins adapted to engage the slots in one of t e terminal sections, a locking member mounted for rotation on said section and provided with bayonet slots adapted to receive pins of the tool bit, there being transverse slots formed in the locking member, and a locking key extending through the slots in the locking member and the'aperture in the adjacent terminal section and provided with a shoulder adapted to engage the adjacent wall of the transverse slotof said locking member for preventing rotation of the latter.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in thepresence of two witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2444758 *Dec 11, 1947Jul 6, 1948Stillbach Jan HCleaning implement
US2498465 *Feb 12, 1948Feb 21, 1950Thomas James MExtension drive shaft and handle grip for rotatable and angularly adjustable tools
US2725086 *Jan 9, 1952Nov 29, 1955Edward N KeyesDetachable grip for increasing leverage of tool handles
US3813967 *Dec 4, 1972Jun 4, 1974De Haven LUnidirectional ratchet wrench for vehicles
US4350064 *Dec 18, 1980Sep 21, 1982Markle James RAuxiliary tool kit for a socket wrench set
US4356852 *Jul 14, 1980Nov 2, 1982Innovative Tool CorporationHand drive tool
US4413937 *Dec 18, 1980Nov 8, 1983Gutsche Guenter EElements for a tool system
US4699020 *May 15, 1986Oct 13, 1987Champion International CorporationHandle adapter
US9579778 *Dec 17, 2013Feb 28, 2017Kabo Tool CompanyElectronic torque wrench with improved handle
US20040231468 *May 23, 2003Nov 25, 2004Mark OdachowskiHand or automatic driven tool for attaching screwed anchors
US20140165798 *Dec 17, 2013Jun 19, 2014Kabo Tool CompanyElectronic torque wrench with improved handle
Cooperative ClassificationB25G1/105