US857632A

US857632A - Tap-holder.

Info

Publication number: US857632A
Application number: US33299106A
Authority: US
Inventors: David Kihlgren
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-09-01
Filing date: 1906-09-01
Publication date: 1907-06-25
Anticipated expiration: 1924-06-25

Description

No. 857,632. PATENTBD JUNE 25, 1907.

D; KIHLGREN.l

TAP HOLDER. APPLICATION FILED SEPT. l, 1906.

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,I 1 1 11,1111 1 lll/11111111114 4 www Y No.4 857,632. -PATENTED JUNE 25, 19'07.

D. KIHLGREN.

TAP HOLDER.

APPLIUATLON PI En SEPTA 19 e.

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DAVID KIHLGREN, OF SPRINGFIELD, MASSACHUSETTS.

TAP-HOLDER.

no. estese.

Specification of Letters Patent.

Patented June 25, 1907.

Application ledBeptember l, 1906- Selal NO- 332.991.

To rar/ZZ whom it may concern.-

Be it known that I, DAvrD KIHLGREN, a citizen oi' the United States of America, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements inTap- Holders, of which the following is a speciiication.

This invention relates to improvements in tool holders and more particularly to tap holders, and it has for its object to provide a device that will prevent breaking or injuring the tap when an undue pressure or torsional strain is exerted thereon by the workman. It is well known in the use of this class of tools that great care is required to be exercised in order not to exert too much torsional strain on the tap so as to prevent breakage; and this is especially true when taps of the smaller dimensions are used; a further object is' to provide an indicating device that will show to the workman the exact torsional strain that can be safely placed upon a tap of a certain size.

Broadly stated, the invention consists in providing the tap holder with ,a bored out portion or receptacle for containing a series of disks; said disks being so arranged that when the tool is in use all-of the disks will be carried around with the wrench and when undue torsional strain is placed upon the tap every alternate oneof the disks, which'carry the chuck piece, will remain stationary with lthe tap, and the remaining disks, which are locked to the wrench, will slip on the same.

l I also provide suitable means for varying the pressure on the disks. l In the drawings which form a part of this application, with the reference characters marked thereon for indicating the elements of the device: Figure 1 is a top plan view of the wrench. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical, longitudinal seetional view on the line 3-3 of Fig. 1. Fig. 4 is a top plan view ofa modification of my invention. Fig. 5' is a vertical longitudinal sectional view of the same on line 5 5 of Fig. 4. Fig. 6 is a detailed view of one of the disks that is held against rotation in the wrench. Fig. 7 is a ldetailed viewof a disk that is adapted to :be rotated when the wrench is in use and having a rectangular opening therethrough-for receiving the chuck. Fig. 8 is a side elevation of another modification of my invention and showing the saine as applied to a spindle adapted for use in a drill press or speed lathe. Fig. 9 is a longitudinal sectional view on the line 9-9 of Fig. 8. Fig. 10 is an end elevation of Fig. 8 and show ing the means for locking the chuck piece in place in the spindle. Fig. 11 is a detailed view of the chuck piece used in the form shown in Figs. 1, 2 and 3. Fig. 12 is a detailed view of chuck piece used in the form shown in Figs. 4 and 5.

The detailed views shown in Figs. 6 and 7 represent elements that are adapted for use in all of the forms. Y c f Referring to the drawings in detail, a designates the handle portion of an ordinary tap tion of the tap wrench and is circular in form as shown in plan view in Fig. 1. This boss is bored out so as to provide a circular receptacle as shown in dotted lines at c. This enlarged portion or boss also extends above the upper portion of the handle as shown at d. This part is threaded for receiving an internally threaded tension cap c. The bored out portion c has recesses out at diametrically opposite points and opening into the same as hown at f. These recesses are for the purpose of receiving the projecting ends g of the disk h as shown in Fig. 7. Placed immediately in contact with the disk h is a circular disk i, having the rectangular opening therethrough. The disks h and i arearranged one above the other as shown in Fig. 3, that is alternating with each other until the same lie iiush, or nearly so, with the top of the portion d. k designates an elastic inverted tension disk that is placed on top of the uppermost disk as shown in Fig. 3 with its outer edge engaging the inner horizontal surface of' the cap e as shown at m. 'n 'designates a chuck piece or tool holder for receiving the tap. This chuck piece is made rectangular or square in shape for ,a greater portion of its length and of a dimension equal to the opening j in the disk 'L so as to closely fit the same. It should be stated that the opening o in the disk h is large enough t0 freely allow the chuck fn.' to pass therethrough. After the disks 71, and f are assembled as shown in Fig. 3 the chuck piece n is passed through an opening p in the lower side of the wrench k and through the series of assembled disks; the

- upper cylindrical end as shown at q is passed through the opening r in the cap piece e and a knurled nut s screwed onto the threaded portion t for holding the chuck n in place.

It will be observed that the tension cap e wrench, b designates the boss or enlarged porp IOO is provided on its periphery with a series of indentations or notches fu.. These notches are forlthe purposeofireceiving the beaded end uQof the pointer o for locking the tension cap e at any desired point at which it is 4 safe to use the tap of a certain size, this point having previously been determined by trial. -It will be observed that upon the rotation of the tension cap e the same is threaded on to the portion t, drawing down or placing under tension the elastic disk f. This disk in turn places under pressure the series of disks h and t with a consequent result thatthe frictional or slipping resistance between the disks is increased, and lessened when the tap is turned in a reverse direction.

In operation., all of the disks drive or rotate with the wrench turning the tap, as un: derstood, by reason of the friction that eX- ists between the disks. The disks being carried around by the workman, rotating the handles a. By increasing the number of disks it Will be understood that the frictional resistance is correspondingly increased, and therefore less rotation of the tension cap e is re uired.

eferring to the modification shown in Fig. 5, substantially the same construction is employed as that shown in Figs. l, 2 and 3. In this form :l: designates a spring plate secured to the handle by the screw y at one end and the opposite end of the plate is drawn down by the screw z. This spring plate engages the uppermost disk of the series and transmits pressure to all of the disks below with a result that the friction between the movable and immovable Washers is increased.

Referring to the modification shown in Fig. 8,A in which my invention is applied to a spindle which is designated at 2. The same is provided with an enlarged portion 3 that is bored out and recessed in the same manner as described above in connection with Figs. l, 2 and 3. This part 3 is threaded at its outerl end as shown at 4 to receive a tension cap 5 in the same manner as described above, and an elastic `vcup-shaped disk 6. The tension cap 5 is notched on its outer edge for receivin a pointer 7, for holding the ca 5 in any esired place, it being understoo that rotation of the cap 5 places the requisite amount of pressure between the several disks. The chuck piece 8 used in this form is held in place by means of a latch 9 pivoted to the cap 5 at the point 10. The circular portion engaging the annular groove 12 in the chuck iece 8. The latch 9 beingretained in its ockin position under the head of the screw 13. n practice I use some powdered substance, as graphite, between the disks to prevent the sticking together of the metal surfaces.

The llchuck piece n as shown in Fig. 12 is adapted for use in the form shown in Fig. 5;

The circular ends 'n.2 having a bearing in the plate a: and in the lower side of the wrench. The shoulders rn.3 engage the under side ofthe plate a; and the bottom of the bored out portion.

It will be seen that in all theforms I have provided a device that will prevent undue strain being placedupon the tap, and that the pressure that is safe for any given size tap can be setv in advance as shown by the index numerals on the tension cap e as shown at 14. i

In using the above described tap, should undue/ torsional. pressure be placed on the wrench, the tap will remain stationary, and a slipping or rotative movement will occur between the disks 7L and i, as understood, thlllpreventing the tap being broken.

at I claim, is

1. ,In a ta -holder having a bored out portion, two series of disks mounted therein, one series being held against rotation, a chuckpiece carried by one of the series of disks, means for varying the pressure on the series whereby one series of disks will slip on the other series when undue torsional strain is eX- erted on the holder.

2. In a tap-holder having a bored out portion, recesses communicating with said bored out portion, a series of disks provided with projecting ends mounted in the bored outl portion and their projecting ends engaging said recesses, another series of disks mounted in the bored out portion and alternately arranged between the iirst mentioned disks, said second series of disks havin a rectangul'ar opening therethrough, the st series of disks having a circular opening therethrough, a chuck rectangular in sha e engaging the rectangular opening in sai disk'whereby, when the holder is rotated the first series of disks will transmit rotative movement to said chuck-piece and whereby when undueA pressure is placed on the holder, rotative movement of the chuck-piece will cease.

3. In a tap holder, means for rotating a tap, said means consisting of two series of frictional disks carried by the holder, means for preventing the rotation of one series, and means for varying the pressure between the disks as described.

4. In a tap holder provided with means for holdin a tap, said means being driven by a multip e series of disks alternately arranged, and means for varying the pressure between said disks for limiting the amount of torsional strain that can be exerted upon the tap.

5.- In a holder of the class described, a series of rictional disks carried thereby, one series provided with locking means for engaging the holder proper, the other series being alternately arranged between said first mentioned series, elastic means vfor varying the pressure between the two series of disks IOO IIO

and means for holding, a tap, said means oonsisting of a chuck piece carried by the second serios of disks.

(i. In a tap holder provided with means for holding a tap, said means being driven by a multiple series of disks alternately arranged, and means for Varying the pressure between said disks for limiting the amount of torsional strain that can be exerted u on the tap', the series of disks bein in p anes at ro right angles to the axis of t e tap-holding means.

DAVID KIHLGREN. Witnesses:

HENRY A. CHAPIN,

H. W. BOWEN.