US2276067A - Disk holding device - Google Patents

Description

l. E. SIQVELAND DISK HOLDING DEVICE March 10, 1942.

Filed July 8, 1941 2 Sheets-Sheet l WW@ m. .W- W M uw 7J B ATTORNEY March 10, 1942. E, 5|QVELAND- DISK HOLDING DEVICE Filed July e, 1941 2 Sheets-Sheet 2 lum/UE Smwfzfeamd BY nl. @un '/l/ nlnf ATTORNEY Patented Mar. 10, 1942 UNTED S'lflllSy PATENT OFFICE 12 Claims.

My invention relates to an improvement in a disk holding device wherein it is desired to provide a device for facilitating the changing of sand paper disks, and the like, used in dentistry.

For many purposes in dentistry various types and classes of abrasive disks are used. These disks are secured to the end of the hand piece or contra angle and are rotated by the dental engine in the usual way for grinding and polishing purposes. It has been common practice to insert a screw or bolt through a central opening in the disk and to screw this bolt into a suitable disk support by rotation of the support by the dental engine. Other types of disk holding means have also been provided, but the bolt has been most commonly used because of its simplicity.

It is the object of the present invention to provide a disk holding device which will support an abrasive disk, or the like, and which will permit changing or replacing of the disks in an extremely simple and effective manner. In applying the disk, it is only necessary to place the disk against the end of the holder and to rotate the dental engine, the disk threading its way onto the holder when the disk is in place. It is only necessary to grasp a portion of the holder, whereupon the disk is rmly secured in place.

It is a feature of the present invention to provide a disk holding device which embodies the use of a spiral spring upon which the disk is threaded. When the disk has been threaded into operative position, the center of the spiral spring is pulled into alignment or substantial alignment with the outer convolutions of the spring, making a at spiral, rather than a conical-shaped spring. When in this iiat relation, the spring acts to hold the disk firmly in place and to prevent rota titon of the disk with respect to the holder.

A feature of my invention lies in the simplicity of the disk holder. The complete holder comprises nothing more than a spiral conical-shaped spring, a shank for supporting the spring and a nut threadable on the supporting shank. Through the use of these three elements a disk holder may be formed which will permit extremely fast changing of the disks.

A further feature of my invention lies in the provision of a spiral spring which is substantially conical-shaped and which is provided with a central connecting member by means of which the center of the spring may be pulled downwardly until all of the convolutions of the spring are in substantially the same plane. This central connecting member maybe either a portion of one end of the spring or may be a separate member to which the upper end of the spring may be attached.

A feature of my invention resides in the fact that disks of the most inexpensive type may be securely held by my disk holder and' that no special disks are required for use in conjunction with the holder. As a result, the disks which are designed for use with the most common type of disk holding means may be used with the present construction and that there is no necessity of changing the style of disks which must be' used.

These and other objects and novel features of my invention will be more clearly and fullyA set forth in the following specication and claims.

In the drawings forming a part of my specification:

Figure 1 is a perspective View of the end of a hand set showing my disk holder holding the disk in place thereupon.

Figure 2 is a cross-sectional view through the disk holder illustrating the construction thereof, in enlarged form.

Figure 3 is an outside elevation view of the disk holding device in greatly enlarged form.

Figure 4 is a View similar to Figure 2, showing the disk holder in position to support a disk.

Figure 5 is a cross-sectional view similar to Figure 2 illustrating a slightly modied form of construction.

Figure 6 is a sectional view similar to Figure 4 showing the modied form of construction in disk holding position.

Figure '7 is a greatly enlarged perspective view of the spring used in conjunction with the holder.

Figure 8 isa sectional view similar to Figure 2 showinganother modified form of disk holder construction.

Figure 9 is a sectional view similar to Figure 8, but showinglthe disk holder in disk holding position.

Figure 10 is a sectional view through the nut or threaded sleeve within which the disk holder operates.

Figure 11 is a view of the shank of the holder in greatly enlarged form.

Figure 12 is a perspective view of the spring l used in conjunction with the disk holder of views 8 and 9.

The disk holder A illustrated in Figures 1 through 4 of the drawings comprises a hollow shanky I Il having external threads I I thereupon at one end thereof. The shank I0 is threaded into a nut or sleeve I2 which is formed in two parts.

The major part I3 of the nut or sleeve I2 is internallyv threaded to engage the external threads of the shank I0. The tip portion I4 is provided with a hollow threaded sleeve I5 integral therewith which also threads into the internal threads of the major portion I3 of the nuta or sleeve I2. An opening or passageway I6 extends through the sleeve or nipple I5 and thorough the entire tip portion I4, this bore I6 being in alignment with the bore II of the shank I0.

A spiral conically-shaped spring I9 projects bef yond the tip I4 of the sleeve I2. This spring I9 has a relatively large spring convolution at the base of the spring and has successively smaller diameter convolutions as the spring progresses toward its upper tip end 201. The tip end 20 is connected by a connecting member 2| to the shank ID. In the construction illustrated the connecting member 2| extends from the tip end 26 through the aligned bores I6 and I I and is bent over the end of the shank I0, as illustrated at 22, tting into a groove in the shank I and being securely soldered or welded in place. The large diameter end 23 of the spring I9 is connected by a connecting wire 24 which extends through the bore I6, together with the connecting member 2| and is anchored within the tip I4. The anchor may be in the form of a loop 25 formed of the spring wire and resting freely against the end of the projecting sleeve or nipple I5. It is essential that the anchoring loop 25 rotate with respect to the nipple in operation of the device.

In operating the disk holder, the diskv B is placed against the tip end 20 of the holder so that the central opening 26 therein accommodates the tip end 20. The entire tip end is rotated by the dental engine, the shank I0 being supported in a suitable chuck or other holding device. Rotation of the holder A, while the disk B is held stationary causes the spring wire I0 to thread itself into the opening 26-of the disk B until the disk rests against the end surface 2'I of the sleeve I2.

In order to clamp the disk in place, the sleeve I2 isnext held from rotation while the shank I0 continued its rotation. 'I'his causes vthe shank I0 to be threaded outwardly in the sleeve I2 and causes the connecting member 2| to be drawn toward the surface 2'I of the sleeve. This forces the spring I9 to assume a flat position upon the surface of the disk. The convolution of the spring is positioned in a substantially at plane. When in this position, the disk B may be used for its prescribed purpose.

When it is desired to change disks, it is only necessary to reverse the direction of rotation of the dental engine and to engage the sleeve I2 with the ngers for a short period of time until the spring I9 assumes its natural position as illustrated in Figure 3 of the drawings. The disk B is then engaged with the ngers and the continued rotation of the holder causes the disk to be threaded oil ofthe spring I9.

It will be noted that as the spring I 9 is formed of relatively thin spring wire the hole 26 does not increase substantially in size by insertion of the spring. As the disk moves to place, the spring I9 fleXes toward the central -connecting member 2|, thus .preventing the tearing of the disk.

a slightly dilerent form of construction of disk holder. This construction is very similar to that previously described, but some diierences exist. In the construction illustrated in Figures and 6, a shank 29 is provided which is hollow and has an axial bore 30 extending therethrough. The shank 29 is externally threaded at 3|. A nut or sleeve 32 is internally threaded to accommodate the shnk 29. The threads preferably do not extend entirely through the nut or sleeve 32, in order to limit pivotal movement of the shank in one direction. A smooth non-threaded portion 33 is shown within the nut or sleeve 32 in the upper extremity thereof. The shank 29 In Figures 5 and 6 of the drawings, I disclose v is preferably provided with a non-threaded upper extremity 34 -which extends through the unthreaded portion 33 of the sleeve 32.

A spiral conically-sha-ped spring 35 is secured to overlie the end surface 36 ofthe sleeve 32. This spring 35 has at its lower end 31, relatively large convolutions which are coiled successively smaller in diameter until they reach the top peak end 39. This top peak end 39 is designed to extend through the central opening 26 of the disk B and .by holding the disk while the spring 35 rotates in one direction, the disk may be threaded onto the spring until it rests on the surface 36. Rotation of the spring 35 in the opposite direction, while the disk B is held stationary, causes this disk to be unthreaded from the spring 35.

In order to insure the centering of the disk B with respect to the holder B, the aperture 26 is adapted to permit the unthreaded end 34fof the shank 29 to extend therethrough. Thus, when the disk B is in place in the dotted outline position of Figure 5 of the drawings, this disk is held centered by the unthreaded end 34 of the shank29.

In order to clamp the disk B, the nut or sleeve 32 is held stationary for al short period oftime while the shank 29 continues rotation, the shank threading its way partially out of the sleeve 32 and pulling the center of the spring 35 downwardly until the various convolutions of the spring are in the same plane. The peak end 39 of the spring 35 is connected yby a connecting member '40 to the shank 29, the end of the connecting member 4I) fbeing illustrated at 4I, as Fbent over the end of the shank 29 and extending in a groove therein. This end 4I is preferably soldered or welded in place. The large diameter end 3'I'of thespringv 35is secured toa connecting member 42 which extends through the bore 30 of the shank 29 and projects beyond the end of the shank. An anchoring tip 43 is secured to the end of the connecting member 42 and a spring 44 encircles the connecting member 42 between the anchoring end 43 and the extreme rend of the shank 29.

In Figures 8 and 9 of the drawings, I disclose a holder Dwhich differs insome respects from the previously described holders. The disk holder D includes a shank 45 which is provided with a threaded Iportion 46, an unthreaded portion 41, and av projecting tip portion 49'. A shoulder 50 may, if desired, encircle the shank 45 between the lower portion of the shank and'ithethreaded portion 46 to limit rotation of thel shankin one direction.

A nut or threaded sleeve 5| is internally threaded at 52 to accommodate the threads 46 of the shank 45. An upper unthreaded portion 53 is provided to accommodate the unthreaded portion 4'I of the shank 45. The unthreadedportion 53 is connected .by a relatively Isma'lldiameter passage 54 or through the sleeve orring 58 threaded into the sleeve 5I providing a shoulder 55 at the end of the unthreaded portion.53 between this portion and the smaller diameter passage 54. The tip end 49 of the shank l4:''is designed to extend through this small diameter passage 54 with plenty of play.

Upon the end surfacev 56 of the nut or sleeve 5I, I provide a spring 51. The large diameter portion 59 of the spring 5'If-rests upon thesurf-ace 56 and the convolutions of the spring are of successively smalleridiameter toward the upper spring end 60. 'I'his upper springend 60 is designed to extend through a tiny opening 6| in the tip end 49 of the shank 45. The large diameter end l59 is connected by a short connecting portion 62 to a spring convolution 63 which is designed to engage inwardly of the shoulder 55.

This construction is provided in order to produce a disk holder in which the springs may be readily changed. It is obvious with this construction that if the spring l should break, it may be removed by withdrawing the tip end 60 from engagement with the hole 6I and by withdrawing the spring convolutions or loop 63 from engagement with the shoulder 55. The loop or convolution 63 may be threaded through the small diameter passage 54 of the bushing or ring 58, and this ring 58 screwed into place. When the convolution 63 is in place, the shank 45 may be inserted and the tip end 6D secured in place.

In accordance with the patent statutes, I have described the principles of construction and operation of my disk holder, and while I have endeavored to set forth the best embodiments thereof, I desire to have it understood that these are only illustrative of a means of carrying out my invention and that obvious changes may be made within the scope of the following claims without departing from the spirit of my invention.

I claim:

1. A disk holder comprising a threaded shank adapted to be supported in a dental hand piece, a substantially conically shaped spiral spring projecting from said shank, and nut means threadably engaged on said shank, said spring designed to threadably engage into an abrasive disk, and said nut operable on said shaft to compre'ss said spring into a substantially flat plane' to clamp said disk against said nut.

2. A disk holder comprising a substantially conical spiral spring, means for rotatably supporting said spring to thread or unthread itself into or out of a disk, and means for compressing the convolutions of said spring into a substantially nat plane to clamp said disk.

3. A clamping device in combination with an element to be clamped having an opening therethrough, the clamping device comprising a substantially conical spring designed to threadably engage into or out of said-opening, and means for compressing said spring into a substantially flat plane to clamp said element.

4. A clamping device in combination with an element to be clamped havingl an opening therethrough, the clamping device comprising a substantially conical spiral spring designed to threadably extend through the opening in said element, and means secured to the tip end of said spiral spring and compressing said spring to clamp said element.

5. A clamping device in combination with an element to be clamped, the clamping device comprising a spiral substantially conically shaped spring, shoulder means against which said spring engages, said spring designed to threadably engage through the opening in said element until said element rests against said shoulder, and means compressing said spring to clamp said element.

6. A clamping device in combination with an element to be clamped having an opening therethrough, the clamping device comprising a spiral substantially conical spring, shoulder means against which said spring engages, said spring designed to threadably engage through the opening in said element until said element rests upon said shoulder, and means secured to the apex of said spring to draw the convolutions thereof into a substantially flat plane to clamp said element against said shoulder.

'7. A disk holder for use with abrasive disks having a central aperture therethrough, the holder including a sleeve, a substantially conical spiral spring, means on the large diameter end of said spring holding said spring rotatable with respect to said sleeve and in proximity thereto, and means secured to the small diameter end of said spring extending into said sleve, and means for exerting longitudinal pull on said connecting means to compress said spring.

8. A disk holder comprising a sleeve, a conical spiral spring, means securing one end of said spring rotatable with respect to said sleeve and in proximity therewith, connecting means secured to the other end of said spring and extending through said spring and into said sleeve, and means secured to said connecting means to exert a longitudinal pull thereupon to compress said spring.

9. A disk holder for use with abrasive disks, said holder including a sleeve, a stud threadably engaging within said sleeve, a spiral conical spring secured at its large diameter end to said sleeve to rotate with respect thereto, the large diameter end of the spring being held in proximity to said sleeve, a connecting means secured to the-small diameter end of said sleeve and to said stud whereby longitudinal movement of said stud with respect to said sleeve may act to compress said spring.

10. A disk holder for use in conjunction with disks having a central opening therethrough comprising a sleeve, a hollow nipple extending into said sleeve, a conical spiral spring threadably engaging said disk so that said disk may be threaded against the end of said nipple, means anchoring the large diameter end of said spring within said nipple to rotate with respect thereto, a stud threadably engaging into said sleeve and connecting means secured to the small diameter end of said spring and-to said stud to compress said spring against said disk.

11. A disk holder for use with disks having an aperture therethrough comprisingan internally threaded sleeve, a stud threadably engaging said sleeve and having an end projecting beyond an end of said sleeve, a conicalspiral spring secured at its large diameter end to a connecting means extended through said stud from said one end thereof, and projecting beyond the other end thereof, a spring encircling said connecting means between the end thereof and said other end of said stud, and connecting means secured to said stud and to said small diameter end of said spring, said spring being threadably engaged in the opening of the disk until said disk encircles said one end of said stud, longitudinal movement of said stud acting to clamp said spring against said disk.

l2. A disk holder for dental disks having an opening therethrough, said holder comprising a sleeve internally threaded, a stud engageable with said threads to move longitudinally of said sleeve, an end on said stud projecting through said sleeve and beyond one end thereof, a conical spiral spring secured at its small diameter end to said end on said stud, and means rotatably securing the large diameter end of said spring to said sleeve.

IVAR E. SIQVELAND.

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