US2554283A

US2554283A - Holding device for hand tools

Info

Publication number: US2554283A
Application number: US90928A
Authority: US
Inventors: George F Wagstaff
Original assignee: Delapena and Son Ltd
Current assignee: Delapena and Son Ltd
Priority date: 1948-05-03
Filing date: 1949-05-02
Publication date: 1951-05-22
Anticipated expiration: 1968-05-22

Description

M y 22, 1951 G. F. WAGSTAFF 2,554,283 HOLDING DEVICE FOR HAND TOOLS Filed May 2, 1949 2 Sheets-Sheet 1 llllll] Invemor Giana-F flvsraz-F May 22, 1951 2 Sheets-Sheet 2 Filed May 2, 194

/ a4 Attorneys Patented May 22, 1951 George F? Wagstafi; Cheltenham, England; assig'nor to: Delapena' & Son Limited, Gheltenham, England Application May Z, 1949, Serial No. 90,928 In Great Britain May 3, I948 8 Claims. 1

This invention relates to holding devices for hand tools, such for example as laps or bones, to enable them to be manipulated with respect to the work.

In the lapping or honin of pins, plugs or other pieces of work it is usual to'mount the work between centres and rotateit while holding the external lap or hone therearound. This procedure is adopted especially when the work is of considerable length, such as an engine crankshaftfor example, and with the work so mounted it becomes very desirable to have some form of holding device for the tool which may in any event be too large to hold in the hand. The crankpins' of the shaft, of course, perform a gyratory or orbital motion and when lapping o'rhoning these pins it is absolutely essential that a holding device be provided for the lap or hone to enable the tool to be accurately held on to the work.

The main object of the invention is to provide a simple and efficient holding device for hand tools which enables the'to'ol to be'efficiently and accurately manipulated with respect to the work.

According to the invention the took-holding device comprises a frame-element, to opposite points of which the tool ispivoted so that it lies substantially within the frame, and coaxial handle members extending outwardly from the frame in opposite directions.

Preferably the frame element is gapped, being preferably substantially C-shape'd, with the tool pivoted to the upper and lower portions thereof while the handle members extend from the lower end of the c and the opposite point of the closed portion of the latter.

Two forms of the invention in which the'toolholding device is constructed to constitute a holder for a hand-held bone, for example the external hone described in the specification of co-pending application for Letters Patent No. 772,450" will now be described, by way of example, with reference to the accompanying drawings; in which:

Figure 1 is a part-sectional broken side elevation of the holding device with the hone mounted therein, the latter bein carried within the frame element of "the holding device on inwardly projecting pivots;

Figure 2 is a part -sectionalend view of the arrangement shownin'Figure 1,

Figure 3 is apart-sectional side elevation of a modification of" the holding device inwhich the 'fram'e element of the latter passes through 2: the jaws of the hone which is mounted on outwardly projecting pivots,

Figure 4 is an end view of the holding device and hone illustrated in Figure 3, and

Figure 5 is a detail sectional view on the line 55 of Figure 4.

Referring to Figures 1 and 2 of the drawings, the arrangement shown therein is particularly suitable for dealin with narrow surfaces of work, especially if the latter perform a gyratory or orbital movement about therotational centre of the work, such for example as the crankpins of a crankshaft. The frame; element Ill is of substantially C-shape (laterally inverted as illustrated) and is formed of bar material bent to provide short upper and lower horizontal portions H, l2 and a vertical portion 13 which, together with inclined portions Ill,- l5 joining the latter to the aforesaid short upper and lower horizontal portions, forms the closed part of the C. From the outer end of the lower horizontal portion l2 an inclined portion l6 extends outwardly and upwardly to form the lower end of the c and terminates in a short vertical portion I! which lies parallel to thevertical portion [3.

Handle members Hi, Is, a broken view of which is shown in Figure 1, of rod-like construction and of sufficient length to clear any projecting portion of the work are positively secured by bolts 26 to the upper end of the short vertical portion I! and to the opposite point of the vertical portion I3, the handle members being knurled for a portion of their length, as shown at [812, and terminating at'their outer ends in knobs l8a, [9a to facilitate handling.

The hone comprises two jaws 2|, 22 hinged together by a hinge pin 23', the free ends of the jaws being connected by an adjusting screw 24 one end of which is non-rotatably retained in a swivel member 26 mounted in the free end of the jaw 22 while its threaded end 24a lies in a bifurcated end 25 of the jaw 2| and is provided with a nut member 241). A holder 2! carrying a pair of abrasive elements 21a mounted in V relationship is secured to the jaw 2| whilst a V-shaped guide 28 is mounted on the other jaw 22.

From opposite points of the short upper and lower horizontal portions ll, I2 of the frame Ill pivot pins 29, 38 project inwardly, the upper pivot pin '29 taking into a recessed lug 3! formed at the end of the jaw 22 of the hone which car-- ries the swivel member 26' while the lower pivot pin 39 enters a recessed'lug, 32" at the hinged end of the jaw. The other jaw of the hone thus extends from the hinge pin 23 towards the gap in the C-shaped frame, the free bifurcated end 25 of this jaw lying within the gap. The outwardly projecting handle members l8, 19 are substantially co-axial with the centre line of the guide 28 and abrasive element holder 21, this having been found of benefit in manipulating the tool with respect to the work.

From the description given it will be understood that in honing the crankpins or main bearing portions of a crankshaft mounted between centres the adjusting screw 24 with its nut 24b is first lifted from the bifurcated end 25 of the free jaw 2|, under turning movement of the swivel member 26, so that it lies at one edge of the gap in the frame element [0. The free jaw 2| may then be turned about its hinge pin 23 into its extreme outward position in which its bifurcated end 25 lies at the other edge of the gap in the frame. these positions the gap in the frame element I and the gap between the jaws 2|, 22 of the hone correspond with each other and the complete device may be passed around the portion of the crankshaft or the like which it is required to hone. The free jaw 2! of the hone is then moved into proximity with the work and the adjusting screw 24 and nut 24b returned about the axis of the swivel member 26 until the threaded end 24a enters the bifurcated end 25 of the free jaw whereafter the nut 24b is tightened to bring the jaws of the hone into correct relationship with the work for commencing the honing operation.

If honing is carried out by rotating the work the holding device, and thus the hone, is maintained non-rotatable by grasping the handle members I8, l9 by means of which the hone may also be stroked back and forth along the portion of the work being finished, as may be desired. It will be understood that, due to the pivotal mounting of the hone in the frame element ID, the hone will be maintained in accurate alignment with the work during stroking or traversing despite any twist which the operator may tend to impose thereon due to differential pressure on the two handle members l8, !9.

It will be understood that the holding device described enables the effective and accurate manipulation of the hand tool with respect to the work even when a crankpin or the like which performs a gyratory or orbital movement about the rotation centre of the work is being dealt with.

To enable manipulation of the adjusting nut 241) during such orbital movement the nut is extended outwardly, as shown, so that its headed end 240 lies clear of any projecting portion of the work.

In the construction of holding device illustrated in Figures 3, i and the laterally elongated substantially C-shaped frame element 33 is arranged to pass through the

jaws

34, 35 of the hone, thus enabling the height of the frame element to be reduced while the hone still lies substantially therewithin. The frame element 33 may also in this case be formed of bar material bent to provide a short upper horizontal portion 36, a vertical portion 31 forming the closed part of the C and a lower horizontal portion 38. The end of the latter is bent upwardly as shown at 39 to form the lower vertical end of the 0. Handle members 4?], 4! are positively secured by bolts 42 to the upper end With the parts in .i

4 of the vertical portion 39 and to the opposite point of the vertical portion 31.

From opposite points of the upper and lower

horizontal portions

36, 38 of the frame element 33

pivot pins

43, 43a project outwardly, the upper pivot pin 43 taking into an inwardly projecting lug 44 formed at the free end of the jaw 35 of the hone which carries the swivel member 45 whilst the lower pivot pin 43a enters an inwardly projecting lug 46 at the hinged end of the jaw. Apertures 47 are formed in the jaw 35 to allow clearance in all directions for the

horizontal portions

36, 38 of the frame element, an elongated aperture 48 also being formed in the jaw 34 to allow the lower horizontal portion 38 to pass therethrough without restricting the movement of the jaw about its hinge pin 23. As in the previously described arrangement, the

handle members

40, 4| are substantially coaxial with the centre line of the guide 28 and abrasive element holder 21.

It will be appreciate-d that the usefulness of the holding devices described is not limted to operations in which the work is rotated, as the devices also afford a valuable means of rotating the hone in an accurate and properly aligned manner with respect to non-rotated work.

I claim:

1. A tool-holding device for a tool having an apertured body and comprising in combination a rigid frame element having an aperture therein to opposite sides of which the tool is pivoted so that it lies substantially within the frame and bridges the aperture, and coaxial handle members extending outwardly from the frame in opposite directions normal to the axis about which the tool is pivoted.

2. A tool-holding device for a tool having an apertured body and comprising in combination a rigid frame element having an aperture therein, pivot means coaxially arranged on opposite sides of said aperture to which the tool is pivoted to lie substantially within the frame and bridge the aperture, and coaxial handle members extending outwardly from the frame in opposite directions normal to the axes of said pivot means.

3. A tool-holding device according to claim 2, wherein the rigid frame element is gapped so that the device may be passed around the desired portion of the work which enters the aperture in the frame element through said gap.

4. A tool-holding device for a tool having an apertured body at least a portion of which is of rigid construction, said device comprising in combination a rigid substantially C-shaped frame element, pivot means coaxially arranged on the upper and lower portions of the C on which said tool is pivoted so that it lies substantially within the frame element whilst said rigid portion bridges the gap between said portions of the frame element, and coaxial handle members extending outwardly from the lower end of the C and the opposite point of the closed portion of the latter to lie normal to the axes ofsaid pivot means.

5. A tool-holding device according to claim 2, wherein the centre line of the outwardly projecting handle members and the centre line of said pivot means substantially intersect the centre line of the work Within the aperture of the tool.

6. A tool-holding device for a tool having an apertured bodyat' least a portion of which is of rigid construction, said device comprising in combination a rigid substantially C-shaped frame element having upper and lower horizontal portions, coaxially arranged pivot pins which project inwardly towards each other from said horizontal portions and which take into recesses formed in the upper and lower ends of the rigid portion of the tool, said frame element having a vertical portion connected to said horizontal portions to form the closed portion of the C, a short vertical portion connected to the lower horizontal portion to form the lower end of the C, and a handle member extending laterally from each of said vertical portions to lie coaxial with each other and normal to the axes of said pivot pins.

7. In combination, a tool-holding device com"- prising a rigid frame element having a gapped aperture therein and a tool having two jaws hinged one upon the other, pivot means connecting opposite ends of one of said jaws and the frame element and arranged so that when the opposite jaw is swung outwardly about its hinge the gap between the jaws of the tool and the gap in the frame element correspond with each other, and coaxial handle members extending laterally from the frame in opposite directions normal to the axes of said pivot means.

8. The combination of a tool-holding device and a tool according to claim 7, wherein a portion of said rigid frame element of the tool-holding device passes through an aperture formed transversely in each jaw of the tool, the apertures formed in said jaws being in substantial alignment with each other and of suflicient size to allow clearance in all directions for the said portion of the rigid frame element.

GEORGE F. WAGSTAFF.

REFERENCES CITED The following references are of record in the file of this patent: