US2706381A - Hairspring and balance arm assembly - Google Patents
Hairspring and balance arm assembly Download PDFInfo
- Publication number
- US2706381A US2706381A US363741A US36374153A US2706381A US 2706381 A US2706381 A US 2706381A US 363741 A US363741 A US 363741A US 36374153 A US36374153 A US 36374153A US 2706381 A US2706381 A US 2706381A
- Authority
- US
- United States
- Prior art keywords
- hairspring
- staff
- balance arm
- hole
- arm assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000010355 oscillation Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B17/00—Mechanisms for stabilising frequency
- G04B17/04—Oscillators acting by spring tension
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49579—Watch or clock making
- Y10T29/49581—Watch or clock making having arbor, pinion, or balance
Definitions
- a pivoted staff having an arm and a hairspring is used. It has heretofore been the custom to drill a round hole slightly off center in the staff and to insert the hairspring and pin the same by a straight pin in the hole. This produces a hairspring with a curved cross sectional area which has a tendency to flex more in one direction than the other and to break.
- Figure 1 is a perspective view showing the complete balance arm and hairspring assembly as in use today.
- Figure 2 is an enlarged detail of the staff.
- Figure 3 is a perspective view of the balance arm and hairspring assembly with the added improvement.
- Figure 4 is an enlarged detail view of the staff.
- a staff 9 is shown having upper pivot 10 and lower pivot 11.
- a collar 12 receives the balance arm 13 While the staff is bored at right angles to its longitudinal length and slightly off center, as at 14, so as to locate the hairspring 15 substantially in a plane passing through the longitudinal axis which may be termed the longitudinal center of the staff.
- the hairspring 15 is pinned in position by a tapered pin 16 which Wedges the hairspring against the curved side of the opening 14 and distorts the hairspring into the shape shown in Figure 2. This curve along its longitudinal length makes the hairspring flex unequally in different directions and in some cases causes breakage before the timing mechanism has fulfilled its purpose.
- a very similar balance arm 17 is mounted on a staff 18 having pivots 19 and 20 and a central face portion 21.
- the off center hole 22 in the face 21 is drilled improvement in hairspring similarly to the hole 14 but an additional operation consisting of using a shaving tool forms a groove 23 on opposite sides of the hole.
- the groove 23 is rectangular in cross section and the same size as the hairspring 24 which it snugly receives and holds in a flat undistorted position.
- a straight pin 25 similar to pin 16 is then drawn through the hole and by wedging the hairspring against the sides of the groove 23 securely holds it in position.
- This hairspring 23 is capable of flexing equally in either direction and by reason of being free of any distortion is very unlikely to break before the function of the timing device is fulfilled.
- a balance arm and hairspring assembly comprising a staff mounted for oscillation, a balance arm attached to said staff, said staff being formed with a transverse hole having opposite parallel grooves, a hairspring receivable in the hole and seated in one of the grooves and a tapered pin receivable in said hole to securely lock said hairspring in said groove without any distortion of said hairspring.
- a balance arm and hairspring assembly comprising a staff mounted for oscillation, a balance arm attached to said staff, a hairspring, said staff being formed with a transverse hole having opposite parallel grooves of a depth equal to the thickness of the hairspring, said hairspring being receivable in the hole and seated in one of said grooves, and means for securing the hairspring in desired position without distorting the hairspring.
- a balance arm and hairspring assembly comprising a staff mounted for oscillation, a balance arm attached to the lower half of said staff, the upper half of said staff being formed with parallel flattened portions, said fiattened portions having a transverse hole formed with a pair of opposite parallel grooves, one of said grooves being along the longitudinal center of said balance staff, a hairspring equal in thickness to the depth of said groove receivable in said hole and seated within the groove along the longitudinal center line, and a pin engaging the hairspring and wall of said hole for securely holding said spring in position without any distortion of said spring.
- a balance arm and hairspring assembly comprising a staff mounted for oscillation, a balance arm attached to the lower half of said staff, the upper half of said staff being formed with parallel flattened portions, said flattened portions having a transverse hole formed with a longitudinal groove, said groove being along the longitudinal center of said balance staff, a hairspring equal in thickness to the depth of said groove receivable in said hole and seated within the groove along the longitudinal center line, and a pin engaging the hairspring and wall of said hole for securely holding said spring in position without any distortion of said spring.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Stringed Musical Instruments (AREA)
Description
April 19, 1955 B. E. WOLFE 2,706,381
HAIRSPRING AND BALANCE ARM ASSEMBLY Filed June 24, 1955 pie/0e 19.87
INVENTOR BRUCE a. WOLFE ATTORNEY United States Patent HAIRSPRHNG AND BALANCE ARM ASSEMBLY Bruce E. Wolfe, Landisville, Pa., assignor to Hamilton Watch Company, Lancaster, Pa.
Application June 24, 1953, Serial No. 363,741 4 Claims. (Cl. 58-115) This invention relates to an and balance arm assemblies.
In time fuses and mechanisms of a like type where an oscillating balance arm and hairspring assembly is used to regulate the escapement of power, a pivoted staff having an arm and a hairspring is used. It has heretofore been the custom to drill a round hole slightly off center in the staff and to insert the hairspring and pin the same by a straight pin in the hole. This produces a hairspring with a curved cross sectional area which has a tendency to flex more in one direction than the other and to break.
It is the object of the present invention to provide the method of manufacture of the staff so that the hairspring may be mounted in the staff without any distortion whatsoever.
It is a further object of the present invention to proyide a means for making a recess in the hole in the staff to receive the hairspring strip and to hold the same without distortion.
The invention is shown in the accompanying drawing in which:
Figure 1 is a perspective view showing the complete balance arm and hairspring assembly as in use today.
Figure 2 is an enlarged detail of the staff.
Figure 3 is a perspective view of the balance arm and hairspring assembly with the added improvement.
Figure 4 is an enlarged detail view of the staff.
Referring first to Figures 1 and 2, a staff 9 is shown having upper pivot 10 and lower pivot 11. A collar 12 receives the balance arm 13 While the staff is bored at right angles to its longitudinal length and slightly off center, as at 14, so as to locate the hairspring 15 substantially in a plane passing through the longitudinal axis which may be termed the longitudinal center of the staff. The hairspring 15 is pinned in position by a tapered pin 16 which Wedges the hairspring against the curved side of the opening 14 and distorts the hairspring into the shape shown in Figure 2. This curve along its longitudinal length makes the hairspring flex unequally in different directions and in some cases causes breakage before the timing mechanism has fulfilled its purpose.
Referring particularly to Figures 3 and 4 in which the change of construction and new method of making and assembling the balance arm and hairspring assembly is shown, a very similar balance arm 17 is mounted on a staff 18 having pivots 19 and 20 and a central face portion 21. The off center hole 22 in the face 21 is drilled improvement in hairspring similarly to the hole 14 but an additional operation consisting of using a shaving tool forms a groove 23 on opposite sides of the hole. The groove 23 is rectangular in cross section and the same size as the hairspring 24 which it snugly receives and holds in a flat undistorted position. A straight pin 25 similar to pin 16 is then drawn through the hole and by wedging the hairspring against the sides of the groove 23 securely holds it in position. This hairspring 23 is capable of flexing equally in either direction and by reason of being free of any distortion is very unlikely to break before the function of the timing device is fulfilled.
What is claimed is:
1. A balance arm and hairspring assembly, comprising a staff mounted for oscillation, a balance arm attached to said staff, said staff being formed with a transverse hole having opposite parallel grooves, a hairspring receivable in the hole and seated in one of the grooves and a tapered pin receivable in said hole to securely lock said hairspring in said groove without any distortion of said hairspring.
2. A balance arm and hairspring assembly, comprising a staff mounted for oscillation, a balance arm attached to said staff, a hairspring, said staff being formed with a transverse hole having opposite parallel grooves of a depth equal to the thickness of the hairspring, said hairspring being receivable in the hole and seated in one of said grooves, and means for securing the hairspring in desired position without distorting the hairspring.
3. A balance arm and hairspring assembly, comprising a staff mounted for oscillation, a balance arm attached to the lower half of said staff, the upper half of said staff being formed with parallel flattened portions, said fiattened portions having a transverse hole formed with a pair of opposite parallel grooves, one of said grooves being along the longitudinal center of said balance staff, a hairspring equal in thickness to the depth of said groove receivable in said hole and seated within the groove along the longitudinal center line, and a pin engaging the hairspring and wall of said hole for securely holding said spring in position without any distortion of said spring.
4. A balance arm and hairspring assembly, comprising a staff mounted for oscillation, a balance arm attached to the lower half of said staff, the upper half of said staff being formed with parallel flattened portions, said flattened portions having a transverse hole formed with a longitudinal groove, said groove being along the longitudinal center of said balance staff, a hairspring equal in thickness to the depth of said groove receivable in said hole and seated within the groove along the longitudinal center line, and a pin engaging the hairspring and wall of said hole for securely holding said spring in position without any distortion of said spring.
References Cited in the file of this patent UNITED STATES PATENTS 1,556,907 Bold Oct. 13, 1925 FOREIGN PATENTS 745,242 France Feb. 14, 1933
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US363741A US2706381A (en) | 1953-06-24 | 1953-06-24 | Hairspring and balance arm assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US363741A US2706381A (en) | 1953-06-24 | 1953-06-24 | Hairspring and balance arm assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2706381A true US2706381A (en) | 1955-04-19 |
Family
ID=23431521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US363741A Expired - Lifetime US2706381A (en) | 1953-06-24 | 1953-06-24 | Hairspring and balance arm assembly |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2706381A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9372473B2 (en) * | 2013-03-26 | 2016-06-21 | Montres Breguet S.A. | Timepiece mechanism comprising a movable oscillating component with optimised geometry in a magnetic environment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1556907A (en) * | 1925-01-02 | 1925-10-13 | Charles H Pearson | Spring regulator |
| FR745242A (en) * | 1933-05-06 |
-
1953
- 1953-06-24 US US363741A patent/US2706381A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR745242A (en) * | 1933-05-06 | |||
| US1556907A (en) * | 1925-01-02 | 1925-10-13 | Charles H Pearson | Spring regulator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9372473B2 (en) * | 2013-03-26 | 2016-06-21 | Montres Breguet S.A. | Timepiece mechanism comprising a movable oscillating component with optimised geometry in a magnetic environment |
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