CA1188489A - Spring compressor - Google Patents
Spring compressorInfo
- Publication number
- CA1188489A CA1188489A CA000397615A CA397615A CA1188489A CA 1188489 A CA1188489 A CA 1188489A CA 000397615 A CA000397615 A CA 000397615A CA 397615 A CA397615 A CA 397615A CA 1188489 A CA1188489 A CA 1188489A
- Authority
- CA
- Canada
- Prior art keywords
- shoes
- spring
- groove
- spaced apart
- shoe
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
- B25B27/30—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same positioning or withdrawing springs, e.g. coil or leaf springs
- B25B27/302—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same positioning or withdrawing springs, e.g. coil or leaf springs coil springs other than torsion coil springs
- B25B27/304—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same positioning or withdrawing springs, e.g. coil or leaf springs coil springs other than torsion coil springs by compressing coil springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/90—Maintenance
- B60G2206/92—Tools or equipment used for assembling
- B60G2206/921—Coil spring compressor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Springs (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention relates to a tool for compressing a helical spring of the type typically used in a MacPherson strut suspension system. The tool comprises a pair of spaced apart shoes each having a helical groove formed therein for engaging a portion of the coil of the spring. Each shoe also includes a latchable locking device extendable over the respective helical groove for maintaining the coil of the spring within the groove during the compression operation. The two shoes are maintained in a spaced apart relationship with the associated grooves in facing relation to one another by means of a threaded shank member. The threaded shank member is employed to effect movement of the spaced apart shoes toward and away from one another during the operation of the tool.
The present invention relates to a tool for compressing a helical spring of the type typically used in a MacPherson strut suspension system. The tool comprises a pair of spaced apart shoes each having a helical groove formed therein for engaging a portion of the coil of the spring. Each shoe also includes a latchable locking device extendable over the respective helical groove for maintaining the coil of the spring within the groove during the compression operation. The two shoes are maintained in a spaced apart relationship with the associated grooves in facing relation to one another by means of a threaded shank member. The threaded shank member is employed to effect movement of the spaced apart shoes toward and away from one another during the operation of the tool.
Description
, ' One type of vehicle suspension system which is becoming increasingly popular is the MacPherSon strut suspension system. The MacPherson s-tru-t is an integral coil spring-shock absorber assembly which provides a li~htweight, compact vehicle suspension system. The MacPherson strut Isuspension system is disclosed in more detail in United States Patent No. 2,624,592 to E.S. MacPherson.
One of the problems associated with the MacPherson strut assembly is that the shock absorber unit -typically ~wears out before the associated coil spring. One solution -to this problem is to manufacture the MacPherson strut assembly with a construction which permits the shock absorber to be readily remove~ and replaced with a new shock absorber.
How~ver, such a repair procedure can be rela-tively time consuming, since typically the strut assembly must be removed ~from the vehicle.
I, One solution to reducing the time associa-ted wi-th repairing a MacPherson s-trut assembly is disclosed in United States Patent No. ~,03~,960 -to K.D. Kloster. The Kloster patent discloses a pneumatic operated spring compressor Iwhich can be utilized to repair a strut assembly while the I lower por-tion of the assembly remains attached -to the I vehicle. ~owever, the economics of such a compressor can ,~typically only be j~stified by repair shops which ~requently ¦,repair strut suspension systems.
Smaller repair shops typically utilize a relatively ~inexpensive spring compressor uni-t of the type manufactured !
l l .,, ,~. , ~ ~
from the spring.
The pair of shoes are preferably maintained in a spaced apart relationship with the associated grooves in facing relation to one another by means oE a threaded shank member employed to effec-t movement of the spaced apar-t shoes toward and away from one ano-ther during the operation of the tool.
Accordingly, it is an object of the presen-t invention to provide a relatively economical spring compressor which can effectively and safely be employed to compress a helical coil spring.
~RIEF DESCRIPTION OF THE DRAWINGS
The invention will become more readily apparent to one skilled in the art from reading the following detailed description of a preferred embodiment of the invention when considered in ligh-t of the accompanying drawings, in whicho Figure 1 is a perspec-tive view of a spring compressor embodying the features of the present invention;
Figure 2 is a rear elevational view of -the lower shoe of the compressor of Figure l;
Figure 3 is a side elevational view of -the shoe shown in Figure 2;
Figure 4 is a sec-tional view taken along line 4-4 of Figure 3;
Figure 5 is a top elevational view of -the shoe shown in Figure 3;
Figure 6 is a sectional view taken along the line 6 6 of Figure 5; and Figure 7 is an elevational view of a helical coil spring having a pair of spring compressors according to the present invention posi-tioned -thereon.
by Warren, Inc. of Jonesboro, Arkansas. This type of spring includes a pair of spaced apart U-shaped hooks which are main-tained in a facing rela-tion by means of an elongate bolt. In operation, typically two or -three of the compressor units are circumferentially spaced abou-t the coil spring and the bol-ts are alternately -tightened to move the U-shaped hooks towards one another, thereby compressing the spring. However, one of the problems associated with -this type of spring compressor is tha-t -the U-shaped hooks do not provide a good seating rela-tionship with the helical coil of the spring which may lead to twisting and misalignmen-t of the spring compressor. Such twisting or misalignment may result in the dangerous condi-tion of causing the compressor hooks to become dislodged `from the spring and inflict injury upon the operator.
The present inven-tion provides an apparatus for com-pressing a helical coil spring which comprises a pair of spaced apart shoes each having a groove formed therein for receiving a portion of the helical coil of the spring, at least one of the shoes including a la-tchable locking means movable between a retracted posi-tion wherein the portion of the helical coil can be inserted into the groove and a locked pOsitiOIl wherein the locking means extends over the groove for maintaining the portion of the helical coil within the groove, means Eor moun-t-ing the shoes in a spaced apart arrangemen-t wi-th the grooves in facing relation to one another, and means for moving the shoes toward and away from one another, -the means for moving being adapted -to be disposed externally of -the coil spring -to be compressed.
Even if the shoes become misaligned, the latchable locking means prevents the apparatus from becoming dislodged ¦ I DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Figure 1, there is shown a spring compressor generally indicated ~y reference numeral 10 llembodying the features of ~he present inven~ion. The compressor S 10-includes an upper shoe 12 and a lower shoe 14 which are I maintained in a spaced apart relationship by an elongate ¦ threaded shank 16. The shoes 12 and 14 have helical grooves 17 and 18 formed therein for receiving a portion of the coil ll~spring to be co~pressed. The shoes 12 and 14 also have ¦llatchable locking means 20 and 22, respectively, mounted thereon which are extendible to a locked position across the respective grooves to maintain the coil within khe groove ¦during the compression operation. The locking means can be moved to a retracted position when it is desired to remove the l~coil from the associated groove.
Referring to Figures 2 through 6, there are shown more detailed drawings illustrating the features of the lower shoe I unit 14. Except for an in-ternally threaded bushing 24 which i5 ¦I centrally located within the shoe 14 to receive the one end 11 of the threaded shank 16, the shoe 14 is basically identical to the upper 5hoe 12. Both shoes can be, for example, aluminum castings.
As previously mentioned, the groove 18 is formed l with a helical configuration. This type of construc-tion 1 provldes an increased bearing surface for engagement with the coil of the spring, thereby militating against any twisting of the shoe 14 during the compression of the spring. As ¦ shown in Figures 3 through 5, the groove 18 is defined by ~ arcuately forrned sidewalls 26 and 28 and a lower inclined 1I surface 30. As shown in Figure 4, the lower inclined surface ~30 is formed at an angle A with respect to a plane perpen-dicular with the longitudinal axis of the threaded shank 16.
¦It has been found that an angle A of approximately 7 pro-~ vides a medium angle which accommoda-tes most large helical ¦'springs. The sidewalls 26 and 28 of the groove 18 axe arcuately formed and spaced apart sufficiently so as to llencompass the expected size ranges of spri~gs. The groove jl 17 of the upper shoe 12 is formed in a slmilar manner ~o the Igroove 18.
lq I The latchable locking means 22 includes a U-shaped Il member 32 formed from a s'teel rod and having a pair of parallel ¦l legs 34 and 36 which extend into parallel aper~ures 38 and 40t 1~ respectively, formed in the shoe 14, As shown in Figure 4, 1, the apertures 38 and 40 are formed at the same angle A as ll the groove 18, The U-shaped member 32 is maintained in eithPr Il a locked or retracted position by means of a pair of detent ~¦ assemblies 42 and 44 located in parallel apertures 46 and 48 ¦ formed ln the shoe 14. The apertures 46 and 48 are perpendi-Il, cular to an~ intersect the apertures 38 and 40, respectively, Il As shown in Figure 6, the detent assembly 44 includes a ball 50, a spring 52, and a locking washer 54, which are mounted within the aperture 48. Th~ spring 52 u.rges the ball 50 downwardly into either a locking detent 56 I or, a retracted detent 58 formed in the leg 36. The detent ¦ assembly 42 and the detents formed in the l.eg 34 are similar to those associated with the leg 36. The latchable lockin~
means 20 of the upper shoe 12 is similar to the lockin~ ~eans 22.
When the U-shaped member 32 is pushed inwardly, as s~own in Figure 5, the legs 34 and 36 will protrude from the I apertures 38 and 40, respectively, and extend outwardly across il -5-l ll ~ ~3$~
the top of the groove 18. At this time, the ball 50 will be seated within the detent 56 to maintai.n the locking member l32 in the locked position. The locking member 32 can be ¦moved to a retracted position, as illustrated in phantom in ~Figure 5, by pulling outwardly on the member 32 such that the ball ~0 will be momentarily moved upward and then seat within the detent 58.
.ll Figure 7 illustrates the general operational position ~of the spring compressing tool 10. Typically, at least two jspring compressors 10 are utilized to compress a single coil spring 60. In positioning the compressors 1~ on the spring 60, the locking means 20 and 22 are moved to the retracted posi,tion while the end co~ils of the spring 50 are seated ¦Iwithin the grooves 17 and 18. Next, the locking means 20 ~and 22 are moved to the locked position in order to secure the shoes 12 and 14 to the coil. A suitable wrench can then be ~uti~ized to alternately rotate the bolts 16 to cause the lowex and upper shoes to move toward one another~ thereby compressing I the spring 60. As previously mentioned, the heli.cal grooves 11 17 and 18 tend to militate against any twisting of the com-pressor 10 during the compression operation, while the locking ¦means 20 and 22 will prevent the compressor 10 from being dislodged from the spring.
¦ In accordance with the provisions of the pa-tent , statutes, the principle and mode of operation of the invention have been explained in what is consiaered to represent 1 its best embodiment. It should, however, be unders-tood -that ¦ the invention may be practiced otherwise than as specifically l il~ustrated and described without departing from its spirit or scope.
.; .
One of the problems associated with the MacPherson strut assembly is that the shock absorber unit -typically ~wears out before the associated coil spring. One solution -to this problem is to manufacture the MacPherson strut assembly with a construction which permits the shock absorber to be readily remove~ and replaced with a new shock absorber.
How~ver, such a repair procedure can be rela-tively time consuming, since typically the strut assembly must be removed ~from the vehicle.
I, One solution to reducing the time associa-ted wi-th repairing a MacPherson s-trut assembly is disclosed in United States Patent No. ~,03~,960 -to K.D. Kloster. The Kloster patent discloses a pneumatic operated spring compressor Iwhich can be utilized to repair a strut assembly while the I lower por-tion of the assembly remains attached -to the I vehicle. ~owever, the economics of such a compressor can ,~typically only be j~stified by repair shops which ~requently ¦,repair strut suspension systems.
Smaller repair shops typically utilize a relatively ~inexpensive spring compressor uni-t of the type manufactured !
l l .,, ,~. , ~ ~
from the spring.
The pair of shoes are preferably maintained in a spaced apart relationship with the associated grooves in facing relation to one another by means oE a threaded shank member employed to effec-t movement of the spaced apar-t shoes toward and away from one ano-ther during the operation of the tool.
Accordingly, it is an object of the presen-t invention to provide a relatively economical spring compressor which can effectively and safely be employed to compress a helical coil spring.
~RIEF DESCRIPTION OF THE DRAWINGS
The invention will become more readily apparent to one skilled in the art from reading the following detailed description of a preferred embodiment of the invention when considered in ligh-t of the accompanying drawings, in whicho Figure 1 is a perspec-tive view of a spring compressor embodying the features of the present invention;
Figure 2 is a rear elevational view of -the lower shoe of the compressor of Figure l;
Figure 3 is a side elevational view of -the shoe shown in Figure 2;
Figure 4 is a sec-tional view taken along line 4-4 of Figure 3;
Figure 5 is a top elevational view of -the shoe shown in Figure 3;
Figure 6 is a sectional view taken along the line 6 6 of Figure 5; and Figure 7 is an elevational view of a helical coil spring having a pair of spring compressors according to the present invention posi-tioned -thereon.
by Warren, Inc. of Jonesboro, Arkansas. This type of spring includes a pair of spaced apart U-shaped hooks which are main-tained in a facing rela-tion by means of an elongate bolt. In operation, typically two or -three of the compressor units are circumferentially spaced abou-t the coil spring and the bol-ts are alternately -tightened to move the U-shaped hooks towards one another, thereby compressing the spring. However, one of the problems associated with -this type of spring compressor is tha-t -the U-shaped hooks do not provide a good seating rela-tionship with the helical coil of the spring which may lead to twisting and misalignmen-t of the spring compressor. Such twisting or misalignment may result in the dangerous condi-tion of causing the compressor hooks to become dislodged `from the spring and inflict injury upon the operator.
The present inven-tion provides an apparatus for com-pressing a helical coil spring which comprises a pair of spaced apart shoes each having a groove formed therein for receiving a portion of the helical coil of the spring, at least one of the shoes including a la-tchable locking means movable between a retracted posi-tion wherein the portion of the helical coil can be inserted into the groove and a locked pOsitiOIl wherein the locking means extends over the groove for maintaining the portion of the helical coil within the groove, means Eor moun-t-ing the shoes in a spaced apart arrangemen-t wi-th the grooves in facing relation to one another, and means for moving the shoes toward and away from one another, -the means for moving being adapted -to be disposed externally of -the coil spring -to be compressed.
Even if the shoes become misaligned, the latchable locking means prevents the apparatus from becoming dislodged ¦ I DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Figure 1, there is shown a spring compressor generally indicated ~y reference numeral 10 llembodying the features of ~he present inven~ion. The compressor S 10-includes an upper shoe 12 and a lower shoe 14 which are I maintained in a spaced apart relationship by an elongate ¦ threaded shank 16. The shoes 12 and 14 have helical grooves 17 and 18 formed therein for receiving a portion of the coil ll~spring to be co~pressed. The shoes 12 and 14 also have ¦llatchable locking means 20 and 22, respectively, mounted thereon which are extendible to a locked position across the respective grooves to maintain the coil within khe groove ¦during the compression operation. The locking means can be moved to a retracted position when it is desired to remove the l~coil from the associated groove.
Referring to Figures 2 through 6, there are shown more detailed drawings illustrating the features of the lower shoe I unit 14. Except for an in-ternally threaded bushing 24 which i5 ¦I centrally located within the shoe 14 to receive the one end 11 of the threaded shank 16, the shoe 14 is basically identical to the upper 5hoe 12. Both shoes can be, for example, aluminum castings.
As previously mentioned, the groove 18 is formed l with a helical configuration. This type of construc-tion 1 provldes an increased bearing surface for engagement with the coil of the spring, thereby militating against any twisting of the shoe 14 during the compression of the spring. As ¦ shown in Figures 3 through 5, the groove 18 is defined by ~ arcuately forrned sidewalls 26 and 28 and a lower inclined 1I surface 30. As shown in Figure 4, the lower inclined surface ~30 is formed at an angle A with respect to a plane perpen-dicular with the longitudinal axis of the threaded shank 16.
¦It has been found that an angle A of approximately 7 pro-~ vides a medium angle which accommoda-tes most large helical ¦'springs. The sidewalls 26 and 28 of the groove 18 axe arcuately formed and spaced apart sufficiently so as to llencompass the expected size ranges of spri~gs. The groove jl 17 of the upper shoe 12 is formed in a slmilar manner ~o the Igroove 18.
lq I The latchable locking means 22 includes a U-shaped Il member 32 formed from a s'teel rod and having a pair of parallel ¦l legs 34 and 36 which extend into parallel aper~ures 38 and 40t 1~ respectively, formed in the shoe 14, As shown in Figure 4, 1, the apertures 38 and 40 are formed at the same angle A as ll the groove 18, The U-shaped member 32 is maintained in eithPr Il a locked or retracted position by means of a pair of detent ~¦ assemblies 42 and 44 located in parallel apertures 46 and 48 ¦ formed ln the shoe 14. The apertures 46 and 48 are perpendi-Il, cular to an~ intersect the apertures 38 and 40, respectively, Il As shown in Figure 6, the detent assembly 44 includes a ball 50, a spring 52, and a locking washer 54, which are mounted within the aperture 48. Th~ spring 52 u.rges the ball 50 downwardly into either a locking detent 56 I or, a retracted detent 58 formed in the leg 36. The detent ¦ assembly 42 and the detents formed in the l.eg 34 are similar to those associated with the leg 36. The latchable lockin~
means 20 of the upper shoe 12 is similar to the lockin~ ~eans 22.
When the U-shaped member 32 is pushed inwardly, as s~own in Figure 5, the legs 34 and 36 will protrude from the I apertures 38 and 40, respectively, and extend outwardly across il -5-l ll ~ ~3$~
the top of the groove 18. At this time, the ball 50 will be seated within the detent 56 to maintai.n the locking member l32 in the locked position. The locking member 32 can be ¦moved to a retracted position, as illustrated in phantom in ~Figure 5, by pulling outwardly on the member 32 such that the ball ~0 will be momentarily moved upward and then seat within the detent 58.
.ll Figure 7 illustrates the general operational position ~of the spring compressing tool 10. Typically, at least two jspring compressors 10 are utilized to compress a single coil spring 60. In positioning the compressors 1~ on the spring 60, the locking means 20 and 22 are moved to the retracted posi,tion while the end co~ils of the spring 50 are seated ¦Iwithin the grooves 17 and 18. Next, the locking means 20 ~and 22 are moved to the locked position in order to secure the shoes 12 and 14 to the coil. A suitable wrench can then be ~uti~ized to alternately rotate the bolts 16 to cause the lowex and upper shoes to move toward one another~ thereby compressing I the spring 60. As previously mentioned, the heli.cal grooves 11 17 and 18 tend to militate against any twisting of the com-pressor 10 during the compression operation, while the locking ¦means 20 and 22 will prevent the compressor 10 from being dislodged from the spring.
¦ In accordance with the provisions of the pa-tent , statutes, the principle and mode of operation of the invention have been explained in what is consiaered to represent 1 its best embodiment. It should, however, be unders-tood -that ¦ the invention may be practiced otherwise than as specifically l il~ustrated and described without departing from its spirit or scope.
.; .
Claims (6)
1. An apparatus for compressing a helical coil spring comprising:
a pair of spaced apart shoes each having a groove formed therein for receiving a portion of the helical coil of the spring, at least one of said shoes including a latchable locking means movable between a retracted position wherein the portion of the helical coil can be inserted into said groove and a locked position wherein said locking means extends over said groove for maintaining the portion of the helical coil within said groove;
means for mounting said shoes in a spaced apart ar-rangement with said grooves in facing relation to one another;
and means for moving said shoes toward and away from one another, said means for moving being adapted to be disposed externally of the coil spring to be compressed.
a pair of spaced apart shoes each having a groove formed therein for receiving a portion of the helical coil of the spring, at least one of said shoes including a latchable locking means movable between a retracted position wherein the portion of the helical coil can be inserted into said groove and a locked position wherein said locking means extends over said groove for maintaining the portion of the helical coil within said groove;
means for mounting said shoes in a spaced apart ar-rangement with said grooves in facing relation to one another;
and means for moving said shoes toward and away from one another, said means for moving being adapted to be disposed externally of the coil spring to be compressed.
2. An apparatus according to claim 1 wherein said grooves are formed of a helical configuration.
3. An apparatus according to claim 1 wherein said latchable locking means includes a U-shaped member having a pair of spaced apart parallel legs extending through apertures formed in said shoe, said U-shaped member movable from the locked position wherein the outer ends of said legs extend over said groove to the retracted position wherein said legs are positioned within said shoe.
4. An apparatus according to claim 3 wherein said latchable locking means includes detent means for maintaining said U-shaped member in either the locked position or the retracted position.
5. An apparatus according to claim 1 wherein said means for mounting said shoes is an elongate shank.
6. An apparatus according to claim 5 wherein said means for moving said shoes includes external threads formed on one end of said shank engagable with internal threads formed in one of said shoes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24228381A | 1981-03-10 | 1981-03-10 | |
| US242,283 | 1981-03-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1188489A true CA1188489A (en) | 1985-06-11 |
Family
ID=22914176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000397615A Expired CA1188489A (en) | 1981-03-10 | 1982-03-04 | Spring compressor |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1188489A (en) |
| DE (1) | DE3208510A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2653051A1 (en) * | 1989-10-18 | 1991-04-19 | Mecanique Energetique | SPRING COMPRESSION DEVICE. |
| DE4212482C2 (en) * | 1992-04-14 | 2003-05-22 | Edelgard Schottke Bgs Werkzeug | Clamping device for helical compression springs |
| DE9314698U1 (en) * | 1993-09-29 | 1993-12-09 | Klann, Horst, 78052 Villingen-Schwenningen | Safety spring tensioner for McPherson struts |
| CN107627260A (en) * | 2017-10-29 | 2018-01-26 | 刘正南 | A kind of Medium voltage switch or circuit breaker contact stage clip assembly tooling |
| US11498381B2 (en) * | 2020-10-29 | 2022-11-15 | Shifukang Industrial Co., Ltd. | Compressor for shock absorber |
-
1982
- 1982-03-04 CA CA000397615A patent/CA1188489A/en not_active Expired
- 1982-03-09 DE DE19823208510 patent/DE3208510A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE3208510A1 (en) | 1982-10-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |